/* roulang page: index */
:root {
            --bg-deep: #08090F;
            --bg-navy: #0D111E;
            --bg-card: #121828;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #94A3B8;
            --border-glow: rgba(0, 240, 255, 0.35);
            --border-subtle: #1E293B;
            --radius-sm: 8px;
            --radius-md: 14px;
            --radius-lg: 22px;
            --shadow-sm: 0 4px 14px rgba(0, 0, 0, 0.4);
            --shadow-glow: 0 0 20px rgba(0, 240, 255, 0.15);
            --transition: 0.25s ease;
            --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-body);
            background: var(--bg-deep);
            color: var(--text-white);
            line-height: 1.6;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
        }

        a {
            color: inherit;
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover {
            color: var(--accent-cyan);
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        button, input, textarea {
            font-family: inherit;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header / Navigation */
        .site-header {
            position: sticky;
            top: 0;
            z-index: 100;
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border-subtle);
            padding: 14px 0;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
        }

        .logo {
            font-size: 1.35rem;
            font-weight: 800;
            letter-spacing: -0.01em;
            line-height: 1.2;
            color: var(--text-white);
            white-space: nowrap;
        }

        .logo span {
            color: var(--accent-cyan);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 28px;
        }

        .main-nav a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-silver);
            position: relative;
            padding: 6px 0;
        }

        .main-nav a:hover,
        .main-nav a.active {
            color: var(--text-white);
        }

        .main-nav a.active::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 100%;
            height: 2px;
            background: var(--accent-cyan);
            box-shadow: 0 0 10px var(--accent-cyan);
            border-radius: 2px;
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-silver);
            padding: 10px 18px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        .btn-signup {
            background: var(--accent-blue);
            border: 1px solid var(--accent-blue);
            color: var(--text-white);
            padding: 10px 22px;
            border-radius: 8px;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: all var(--transition);
            white-space: nowrap;
            box-shadow: 0 4px 14px rgba(0, 82, 255, 0.35);
        }

        .btn-signup:hover {
            background: #0a3fb8;
            border-color: #0a3fb8;
            box-shadow: 0 6px 20px rgba(0, 82, 255, 0.55);
            transform: translateY(-1px);
            color: #fff;
        }

        .mobile-toggle {
            display: none;
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-white);
            padding: 8px 12px;
            border-radius: 8px;
            font-size: 1.3rem;
            cursor: pointer;
        }

        /* Hero Section */
        .hero {
            padding: 70px 0 50px;
            background: linear-gradient(145deg, var(--bg-deep) 0%, var(--bg-navy) 55%, #0A1128 100%);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: -100px;
            right: -80px;
            width: 420px;
            height: 420px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.12), transparent 70%);
            border-radius: 50%;
            pointer-events: none;
        }

        .hero-inner {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 40px;
            align-items: center;
            position: relative;
            z-index: 2;
        }

        .hero-content h1 {
            font-size: 2.7rem;
            font-weight: 900;
            line-height: 1.15;
            letter-spacing: -0.02em;
            margin-bottom: 18px;
            color: var(--text-white);
        }

        .hero-content h1 em {
            font-style: normal;
            color: var(--accent-cyan);
        }

        .hero-desc {
            font-size: 1.1rem;
            color: var(--text-silver);
            max-width: 520px;
            margin-bottom: 28px;
            line-height: 1.65;
        }

        .hero-cta-group {
            display: flex;
            align-items: center;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 26px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent-blue), #0066ff);
            border: none;
            color: #fff;
            padding: 14px 30px;
            border-radius: 10px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: all var(--transition);
            box-shadow: 0 6px 22px rgba(0, 82, 255, 0.4);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(0, 240, 255, 0.3);
            color: #fff;
        }

        .btn-secondary {
            background: transparent;
            border: 1px solid rgba(0, 240, 255, 0.5);
            color: var(--accent-cyan);
            padding: 14px 28px;
            border-radius: 10px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: all var(--transition);
        }

        .btn-secondary:hover {
            background: rgba(0, 240, 255, 0.08);
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        .hero-stats {
            display: flex;
            gap: 28px;
            flex-wrap: wrap;
        }

        .stat-item {
            display: flex;
            flex-direction: column;
        }

        .stat-number {
            font-size: 1.7rem;
            font-weight: 800;
            color: var(--text-white);
            line-height: 1.2;
        }

        .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        .hero-visual {
            background: rgba(13, 17, 30, 0.7);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 24px;
            box-shadow: var(--shadow-glow);
        }

        .hero-visual img {
            border-radius: var(--radius-md);
            width: 100%;
            object-fit: cover;
            margin-bottom: 16px;
        }

        .hero-visual .visual-caption {
            font-size: 0.9rem;
            color: var(--text-silver);
            text-align: center;
        }

        /* Section Common */
        .section {
            padding: 60px 0;
        }

        .section-title {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.01em;
            margin-bottom: 10px;
            line-height: 1.25;
        }

        .section-sub {
            font-size: 1.05rem;
            color: var(--text-silver);
            max-width: 700px;
            margin-bottom: 36px;
            line-height: 1.65;
        }

        .section-head {
            margin-bottom: 36px;
        }

        /* Trial / Benefits */
        .trial-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 24px;
        }

        .trial-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px;
            transition: all var(--transition);
        }

        .trial-card:hover {
            border-color: var(--accent-cyan);
            box-shadow: var(--shadow-glow);
            transform: translateY(-4px);
        }

        .trial-card .icon {
            font-size: 2rem;
            color: var(--accent-cyan);
            margin-bottom: 16px;
        }

        .trial-card h3 {
            font-size: 1.25rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .trial-card p {
            color: var(--text-silver);
            font-size: 0.95rem;
            line-height: 1.6;
        }

        /* Eligibility */
        .eligibility-wrap {
            background: linear-gradient(135deg, rgba(0, 82, 255, 0.08), rgba(0, 240, 255, 0.04));
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 36px;
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
        }

        .eligibility-left h3 {
            font-size: 1.5rem;
            font-weight: 700;
            margin-bottom: 12px;
        }

        .eligibility-left p {
            color: var(--text-silver);
            line-height: 1.65;
        }

        .eligibility-list {
            list-style: none;
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .eligibility-list li {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            color: var(--text-silver);
            font-size: 0.95rem;
        }

        .eligibility-list i {
            color: var(--accent-cyan);
            margin-top: 4px;
        }

        /* Info / News List */
        .info-layout {
            display: grid;
            grid-template-columns: 1.5fr 0.7fr;
            gap: 32px;
        }

        .info-list {
            display: flex;
            flex-direction: column;
            gap: 14px;
        }

        .info-item {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 16px;
            padding: 16px 20px;
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            transition: all var(--transition);
        }

        .info-item:hover {
            border-color: var(--accent-cyan);
            transform: translateX(4px);
        }

        .info-item a {
            font-weight: 600;
            color: var(--text-white);
        }

        .info-item a:hover {
            color: var(--accent-cyan);
        }

        .info-item .info-meta {
            font-size: 0.8rem;
            color: var(--text-muted);
            white-space: nowrap;
        }

        .info-sidebar {
            background: var(--bg-navy);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 24px;
            height: fit-content;
        }

        .info-sidebar h4 {
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 14px;
        }

        .sidebar-item {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 0;
            border-bottom: 1px solid var(--border-subtle);
        }

        .sidebar-item:last-child {
            border-bottom: none;
        }

        .sidebar-item i {
            color: var(--accent-cyan);
            font-size: 0.9rem;
        }

        .sidebar-item span {
            font-size: 0.9rem;
            color: var(--text-silver);
        }

        /* Form Section */
        .form-section {
            background: var(--bg-navy);
            border-radius: var(--radius-lg);
            padding: 40px;
            border: 1px solid var(--border-subtle);
        }

        .form-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 18px;
        }

        .form-grid .full {
            grid-column: span 2;
        }

        .form-field {
            display: flex;
            flex-direction: column;
            gap: 6px;
        }

        .form-field label {
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-silver);
        }

        .form-field input,
        .form-field textarea {
            background: var(--bg-deep);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-sm);
            padding: 12px 16px;
            color: var(--text-white);
            font-size: 0.95rem;
            transition: border-color var(--transition);
            width: 100%;
        }

        .form-field input:focus,
        .form-field textarea:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.1);
        }

        .form-submit {
            margin-top: 20px;
            text-align: right;
        }

        .btn-submit {
            background: var(--accent-blue);
            border: none;
            color: #fff;
            padding: 14px 34px;
            border-radius: 10px;
            font-weight: 700;
            cursor: pointer;
            transition: all var(--transition);
            box-shadow: 0 4px 16px rgba(0, 82, 255, 0.35);
        }

        .btn-submit:hover {
            background: #0a3fb8;
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 240, 255, 0.25);
            color: #fff;
        }

        /* Footer */
        .site-footer {
            background: #06070C;
            border-top: 1px solid var(--border-subtle);
            padding: 40px 0 24px;
            margin-top: 40px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.2fr 0.8fr 0.8fr;
            gap: 32px;
            margin-bottom: 28px;
        }

        .footer-brand {
            font-size: 1.3rem;
            font-weight: 800;
            margin-bottom: 10px;
        }

        .footer-brand span {
            color: var(--accent-cyan);
        }

        .footer-desc {
            color: var(--text-muted);
            font-size: 0.9rem;
            line-height: 1.6;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--text-white);
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 8px;
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 20px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* FAB */
        .fab {
            position: fixed;
            left: 20px;
            bottom: 96px;
            z-index: 80;
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: rgba(0, 0, 0, 0.7);
            backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(0,0,0,0.7), rgba(0,0,0,0.7)), linear-gradient(135deg, var(--accent-cyan), var(--accent-blue));
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.5rem;
            cursor: pointer;
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.4);
            transition: all var(--transition);
            opacity: 0.7;
            animation: fabFloat 3s ease-in-out infinite;
        }

        .fab:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 28px rgba(0, 240, 255, 0.7);
            color: #fff;
        }

        .fab:active {
            transform: scale(0.95);
            border-color: #FF007F;
        }

        @keyframes fabFloat {
            0%, 100% { transform: translateY(0); }
            50% { transform: translateY(-6px); }
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .hero-inner {
                grid-template-columns: 1fr;
            }
            .hero-content h1 {
                font-size: 2.2rem;
            }
            .trial-grid {
                grid-template-columns: repeat(2, 1fr);
            }
            .info-layout {
                grid-template-columns: 1fr;
            }
            .eligibility-wrap {
                grid-template-columns: 1fr;
            }
            .form-grid {
                grid-template-columns: 1fr;
            }
            .form-grid .full {
                grid-column: span 1;
            }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .main-nav {
                display: none;
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                background: rgba(8, 9, 15, 0.98);
                flex-direction: column;
                padding: 20px;
                gap: 16px;
                border-bottom: 1px solid var(--border-subtle);
            }
            .main-nav.open {
                display: flex;
            }
            .mobile-toggle {
                display: block;
            }
            .header-actions {
                display: flex;
            }
            .btn-login, .btn-signup {
                padding: 8px 14px;
                font-size: 0.8rem;
            }
            .hero {
                padding: 40px 0 30px;
            }
            .hero-content h1 {
                font-size: 1.8rem;
            }
            .hero-desc {
                font-size: 1rem;
            }
            .trial-grid {
                grid-template-columns: 1fr;
            }
            .section {
                padding: 40px 0;
            }
            .section-title {
                font-size: 1.5rem;
            }
            .footer-grid {
                grid-template-columns: 1fr;
            }
            .fab {
                left: 12px;
                bottom: 80px;
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }
            .hero-content h1 {
                font-size: 1.5rem;
            }
            .hero-stats {
                gap: 16px;
            }
            .stat-number {
                font-size: 1.3rem;
            }
            .hero-cta-group {
                flex-direction: column;
                align-items: stretch;
            }
            .btn-primary, .btn-secondary {
                text-align: center;
            }
            .form-section {
                padding: 24px;
            }
            .info-item {
                flex-direction: column;
                align-items: flex-start;
            }
        }

/* roulang page: article */
:root {
            --bg-primary: #0F0C20;
            --bg-secondary: #0B1A30;
            --bg-card: #151130;
            --accent-lime: #CCFF00;
            --accent-cyan: #00F0FF;
            --accent-hot-pink: #FF007F;
            --text-primary: #FFFFFF;
            --text-secondary: #A6ACAF;
            --text-muted: #6B7280;
            --border-glow: rgba(0, 240, 255, 0.35);
            --border-subtle: rgba(255, 255, 255, 0.08);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --shadow-neon: 0 0 18px rgba(0, 240, 255, 0.25);
            --shadow-lift: 0 12px 30px rgba(0, 0, 0, 0.45);
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            --font-body: 'Segoe UI', 'Roboto', 'Helvetica Neue', Arial, sans-serif;
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            margin: 0;
            font-family: var(--font-body);
            background: var(--bg-primary);
            color: var(--text-primary);
            line-height: 1.65;
            font-size: 16px;
            overflow-x: hidden;
            background-image:
                radial-gradient(circle at 15% 20%, rgba(0, 240, 255, 0.06) 0%, transparent 35%),
                radial-gradient(circle at 85% 10%, rgba(204, 255, 0, 0.05) 0%, transparent 30%),
                radial-gradient(circle at 50% 90%, rgba(255, 0, 127, 0.04) 0%, transparent 40%);
            background-attachment: fixed;
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover,
        a:focus {
            color: var(--accent-lime);
            text-decoration: none;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 3px;
            border-radius: 4px;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header & Navigation */
        .site-header {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            z-index: 1000;
            background: rgba(15, 12, 32, 0.88);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            transition: var(--transition);
        }

        .site-header.scrolled {
            background: rgba(15, 12, 32, 0.96);
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.4);
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 72px;
            gap: 16px;
        }

        .logo {
            display: flex;
            align-items: center;
            gap: 10px;
            font-weight: 700;
            font-size: 1.15rem;
            color: var(--text-primary);
            letter-spacing: 0.02em;
            white-space: nowrap;
            min-width: 0;
        }

        .logo-icon {
            width: 38px;
            height: 38px;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-lime));
            border-radius: 10px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #0F0C20;
            font-size: 1.2rem;
            flex-shrink: 0;
            box-shadow: var(--shadow-neon);
        }

        .logo span {
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-lime));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
        }

        .main-nav a {
            padding: 10px 16px;
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-secondary);
            border-radius: 50px;
            white-space: nowrap;
            transition: var(--transition);
            position: relative;
        }

        .main-nav a:hover,
        .main-nav a:focus {
            color: var(--text-primary);
            background: rgba(255, 255, 255, 0.06);
        }

        .main-nav a.active {
            color: #0F0C20;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-lime));
            font-weight: 600;
            box-shadow: var(--shadow-neon);
        }

        .header-actions {
            display: flex;
            align-items: center;
            gap: 10px;
            flex-shrink: 0;
        }

        .btn-login {
            padding: 9px 18px;
            font-size: 0.9rem;
            font-weight: 600;
            color: var(--text-primary);
            background: transparent;
            border: none;
            cursor: pointer;
            border-radius: 50px;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-login:hover {
            color: var(--accent-cyan);
            background: rgba(255, 255, 255, 0.05);
        }

        .btn-signup {
            padding: 10px 22px;
            font-size: 0.9rem;
            font-weight: 700;
            color: #0F0C20;
            background: linear-gradient(135deg, var(--accent-lime), var(--accent-cyan));
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
            box-shadow: 0 4px 16px rgba(204, 255, 0, 0.25);
        }

        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 240, 255, 0.35);
        }

        .mobile-toggle {
            display: none;
            background: transparent;
            border: 1px solid var(--border-subtle);
            color: var(--text-primary);
            width: 42px;
            height: 42px;
            border-radius: 10px;
            font-size: 1.3rem;
            cursor: pointer;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }

        .mobile-toggle:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        /* Article Page Specific */
        .article-wrapper {
            padding-top: 110px;
            padding-bottom: 70px;
            min-height: 70vh;
        }

        .article-hero-banner {
            position: relative;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            border-radius: var(--radius-lg);
            overflow: hidden;
            margin-bottom: 40px;
            min-height: 320px;
            display: flex;
            align-items: flex-end;
            box-shadow: var(--shadow-lift);
            border: 1px solid var(--border-subtle);
        }

        .article-hero-banner::after {
            content: '';
            position: absolute;
            inset: 0;
            background: linear-gradient(to top, rgba(15, 12, 32, 0.92) 0%, rgba(15, 12, 32, 0.4) 60%, rgba(15, 12, 32, 0.2) 100%);
        }

        .article-hero-content {
            position: relative;
            z-index: 2;
            padding: 40px 36px 32px;
            max-width: 820px;
        }

        .article-category-badge {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            padding: 6px 16px;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            color: #0F0C20;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-lime));
            border-radius: 50px;
            margin-bottom: 16px;
            box-shadow: var(--shadow-neon);
        }

        .article-hero-content h1 {
            font-size: clamp(1.8rem, 4vw, 2.8rem);
            font-weight: 800;
            line-height: 1.25;
            margin: 0 0 14px 0;
            color: var(--text-primary);
            letter-spacing: -0.01em;
        }

        .article-meta {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 16px;
            font-size: 0.88rem;
            color: var(--text-secondary);
        }

        .article-meta .meta-item {
            display: inline-flex;
            align-items: center;
            gap: 6px;
        }

        .article-meta i {
            color: var(--accent-cyan);
        }

        .article-body {
            max-width: 820px;
            margin: 0 auto;
            background: rgba(21, 17, 48, 0.7);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 40px 36px;
            box-shadow: var(--shadow-lift);
        }

        .article-body h2 {
            font-size: 1.6rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 32px 0 16px;
            line-height: 1.3;
            letter-spacing: -0.01em;
        }

        .article-body h3 {
            font-size: 1.25rem;
            font-weight: 600;
            color: var(--accent-cyan);
            margin: 24px 0 12px;
            line-height: 1.35;
        }

        .article-body p {
            margin: 0 0 18px;
            color: var(--text-secondary);
            font-size: 1rem;
            line-height: 1.75;
        }

        .article-body strong {
            color: var(--text-primary);
            font-weight: 600;
        }

        .article-body ul,
        .article-body ol {
            margin: 0 0 20px;
            padding-left: 24px;
            color: var(--text-secondary);
        }

        .article-body li {
            margin-bottom: 8px;
            line-height: 1.7;
        }

        .article-body blockquote {
            margin: 28px 0;
            padding: 20px 24px;
            border-left: 4px solid var(--accent-cyan);
            background: rgba(0, 240, 255, 0.06);
            border-radius: 0 var(--radius-md) var(--radius-md) 0;
            color: var(--text-primary);
            font-size: 1.05rem;
            font-style: italic;
            line-height: 1.7;
        }

        .article-body img {
            border-radius: var(--radius-md);
            margin: 24px 0;
            box-shadow: var(--shadow-lift);
        }

        .article-body table {
            width: 100%;
            border-collapse: collapse;
            margin: 24px 0;
            font-size: 0.92rem;
            border-radius: var(--radius-sm);
            overflow: hidden;
        }

        .article-body table th {
            background: rgba(0, 240, 255, 0.12);
            color: var(--text-primary);
            font-weight: 600;
            padding: 12px 16px;
            text-align: left;
            border-bottom: 2px solid var(--border-subtle);
        }

        .article-body table td {
            padding: 12px 16px;
            color: var(--text-secondary);
            border-bottom: 1px solid var(--border-subtle);
        }

        .article-body table tr:hover td {
            background: rgba(255, 255, 255, 0.03);
        }

        .article-not-found {
            text-align: center;
            padding: 80px 20px;
            max-width: 600px;
            margin: 0 auto;
        }

        .article-not-found i {
            font-size: 4rem;
            color: var(--text-muted);
            margin-bottom: 20px;
        }

        .article-not-found h2 {
            font-size: 1.8rem;
            margin-bottom: 12px;
        }

        .article-not-found p {
            color: var(--text-secondary);
            margin-bottom: 24px;
        }

        .btn-back-home {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 12px 26px;
            font-size: 0.95rem;
            font-weight: 600;
            color: #0F0C20;
            background: linear-gradient(135deg, var(--accent-cyan), var(--accent-lime));
            border-radius: 50px;
            box-shadow: var(--shadow-neon);
            transition: var(--transition);
        }

        .btn-back-home:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 240, 255, 0.35);
            color: #0F0C20;
        }

        .article-tags {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            margin-top: 32px;
            padding-top: 24px;
            border-top: 1px solid var(--border-subtle);
        }

        .article-tags .tag {
            padding: 6px 14px;
            font-size: 0.8rem;
            color: var(--text-secondary);
            background: rgba(255, 255, 255, 0.05);
            border: 1px solid var(--border-subtle);
            border-radius: 50px;
            transition: var(--transition);
        }

        .article-tags .tag:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
        }

        /* CTA Section */
        .article-cta {
            margin-top: 50px;
            background: linear-gradient(135deg, rgba(0, 240, 255, 0.08), rgba(204, 255, 0, 0.06));
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-lg);
            padding: 36px 32px;
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            box-shadow: var(--shadow-lift);
        }

        .article-cta h3 {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 6px;
        }

        .article-cta p {
            margin: 0;
            color: var(--text-secondary);
            font-size: 0.95rem;
        }

        .btn-cta {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            padding: 13px 28px;
            font-size: 0.95rem;
            font-weight: 700;
            color: #0F0C20;
            background: linear-gradient(135deg, var(--accent-lime), var(--accent-cyan));
            border: none;
            border-radius: 50px;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 16px rgba(204, 255, 0, 0.25);
            white-space: nowrap;
        }

        .btn-cta:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 24px rgba(0, 240, 255, 0.35);
            color: #0F0C20;
        }

        /* Footer */
        .site-footer {
            background: rgba(11, 26, 48, 0.9);
            border-top: 1px solid var(--border-subtle);
            padding: 50px 0 30px;
            margin-top: 40px;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 36px;
        }

        .footer-brand {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 14px;
        }

        .footer-brand span {
            background: linear-gradient(90deg, var(--accent-cyan), var(--accent-lime));
            -webkit-background-clip: text;
            background-clip: text;
            -webkit-text-fill-color: transparent;
        }

        .footer-desc {
            color: var(--text-secondary);
            font-size: 0.9rem;
            line-height: 1.7;
            max-width: 400px;
        }

        .footer-col h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-primary);
            margin: 0 0 16px;
            letter-spacing: 0.03em;
        }

        .footer-col a {
            display: block;
            color: var(--text-secondary);
            font-size: 0.9rem;
            padding: 6px 0;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
            padding-left: 4px;
        }

        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 22px;
            font-size: 0.82rem;
            color: var(--text-muted);
            text-align: center;
        }

        /* FAB */
        .fab-left {
            position: fixed;
            left: 16px;
            bottom: 96px;
            z-index: 50;
            width: 56px;
            height: 56px;
            border-radius: 18px;
            background: rgba(0, 0, 0, 0.6);
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 2px solid transparent;
            background-clip: padding-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.4rem;
            cursor: pointer;
            opacity: 0.6;
            transition: var(--transition);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            animation: fab-breathe 3s ease-in-out infinite;
        }

        .fab-left::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 18px;
            background: linear-gradient(135deg, var(--accent-lime), var(--accent-cyan));
            z-index: -1;
            opacity: 0.7;
        }

        .fab-left:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.8);
            animation: none;
        }

        .fab-left:active {
            transform: scale(0.95);
            border-color: var(--accent-hot-pink);
            color: var(--accent-hot-pink);
        }

        @keyframes fab-breathe {
            0%, 100% {
                opacity: 0.6;
                box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            }
            50% {
                opacity: 0.9;
                box-shadow: 0 0 28px rgba(0, 240, 255, 0.7);
            }
        }

        /* Responsive */
        @media (max-width: 1024px) {
            .header-inner {
                height: 64px;
            }

            .main-nav a {
                padding: 8px 12px;
                font-size: 0.85rem;
            }

            .article-body {
                padding: 30px 24px;
            }
        }

        @media (max-width: 768px) {
            .header-inner {
                height: 60px;
                gap: 8px;
            }

            .logo {
                font-size: 0.95rem;
            }

            .logo-icon {
                width: 32px;
                height: 32px;
                font-size: 1rem;
                border-radius: 8px;
            }

            .main-nav {
                display: none;
                position: absolute;
                top: 60px;
                left: 0;
                right: 0;
                background: rgba(15, 12, 32, 0.98);
                backdrop-filter: blur(18px);
                -webkit-backdrop-filter: blur(18px);
                flex-direction: column;
                padding: 16px 20px;
                gap: 4px;
                border-bottom: 1px solid var(--border-subtle);
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
            }

            .main-nav.open {
                display: flex;
            }

            .main-nav a {
                width: 100%;
                padding: 12px 16px;
                font-size: 0.95rem;
                border-radius: 10px;
            }

            .mobile-toggle {
                display: flex;
            }

            .header-actions {
                gap: 6px;
            }

            .btn-login {
                padding: 8px 12px;
                font-size: 0.82rem;
            }

            .btn-signup {
                padding: 8px 16px;
                font-size: 0.82rem;
            }

            .article-wrapper {
                padding-top: 80px;
                padding-bottom: 40px;
            }

            .article-hero-banner {
                min-height: 240px;
                border-radius: var(--radius-md);
            }

            .article-hero-content {
                padding: 24px 20px 20px;
            }

            .article-hero-content h1 {
                font-size: 1.5rem;
            }

            .article-body {
                padding: 22px 18px;
                border-radius: var(--radius-md);
            }

            .article-body h2 {
                font-size: 1.3rem;
            }

            .article-cta {
                padding: 24px 20px;
                flex-direction: column;
                text-align: center;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 28px;
            }

            .fab-left {
                width: 48px;
                height: 48px;
                font-size: 1.2rem;
                bottom: 80px;
                left: 12px;
                border-radius: 14px;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 14px;
            }

            .logo {
                font-size: 0.85rem;
                gap: 6px;
            }

            .logo-icon {
                width: 28px;
                height: 28px;
                font-size: 0.85rem;
            }

            .btn-login {
                padding: 6px 10px;
                font-size: 0.75rem;
            }

            .btn-signup {
                padding: 7px 12px;
                font-size: 0.75rem;
            }

            .mobile-toggle {
                width: 36px;
                height: 36px;
                font-size: 1.1rem;
            }

            .article-hero-banner {
                min-height: 200px;
            }

            .article-hero-content {
                padding: 18px 14px 14px;
            }

            .article-hero-content h1 {
                font-size: 1.3rem;
            }

            .article-meta {
                font-size: 0.78rem;
                gap: 10px;
            }

            .article-body {
                padding: 18px 14px;
            }

            .article-body h2 {
                font-size: 1.15rem;
            }

            .article-body h3 {
                font-size: 1rem;
            }

            .article-body p,
            .article-body li {
                font-size: 0.92rem;
            }

            .btn-cta {
                width: 100%;
                justify-content: center;
            }
        }

/* roulang page: category1 */
:root {
            --bg-deep: #08090f;
            --bg-navy: #0d111e;
            --bg-card: #12182a;
            --accent-blue: #0052ff;
            --accent-cyan: #00f0ff;
            --text-white: #ffffff;
            --text-silver: #cbd5e1;
            --text-muted: #7c8ba1;
            --border-glow: rgba(0, 240, 255, 0.25);
            --border-subtle: rgba(255, 255, 255, 0.08);
            --radius-md: 14px;
            --radius-lg: 22px;
            --radius-sm: 8px;
            --shadow-card: 0 8px 30px rgba(0, 0, 0, 0.45);
            --shadow-glow: 0 0 25px rgba(0, 240, 255, 0.15);
            --transition: 0.28s cubic-bezier(0.4, 0, 0.2, 1);
            --font-primary: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }

        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }

        html {
            scroll-behavior: smooth;
        }

        body {
            font-family: var(--font-primary);
            background: var(--bg-deep);
            color: var(--text-white);
            line-height: 1.65;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
            overflow-x: hidden;
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: color var(--transition);
        }

        a:hover,
        a:focus {
            color: var(--text-white);
            outline: none;
        }

        img {
            max-width: 100%;
            display: block;
            border-radius: var(--radius-md);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }

        /* Header & Navigation */
        .site-header {
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
            z-index: 100;
            padding: 14px 0;
        }

        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 20px;
            flex-wrap: wrap;
        }

        .brand-logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: var(--text-white);
            line-height: 1.2;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .brand-logo i {
            color: var(--accent-cyan);
            font-size: 1.7rem;
            filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.6));
        }

        .brand-logo span {
            background: linear-gradient(135deg, #ffffff 30%, #00f0ff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 8px;
            flex-wrap: wrap;
        }

        .main-nav a {
            color: var(--text-silver);
            padding: 9px 16px;
            border-radius: 50px;
            font-weight: 600;
            font-size: 0.95rem;
            transition: all var(--transition);
            border: 1px solid transparent;
            display: inline-block;
        }

        .main-nav a:hover,
        .main-nav a:focus {
            background: rgba(0, 240, 255, 0.08);
            color: var(--text-white);
            border-color: var(--border-glow);
        }

        .main-nav a.active {
            background: rgba(0, 240, 255, 0.12);
            color: var(--accent-cyan);
            border-color: var(--border-glow);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.2);
        }

        .auth-buttons {
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .btn-login {
            color: var(--text-silver);
            font-weight: 600;
            padding: 9px 16px;
            border-radius: 50px;
            transition: all var(--transition);
            border: 1px solid transparent;
        }

        .btn-login:hover,
        .btn-login:focus {
            color: var(--text-white);
            background: rgba(255, 255, 255, 0.05);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: var(--text-white);
            font-weight: 700;
            padding: 10px 22px;
            border-radius: 50px;
            border: none;
            transition: all var(--transition);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            cursor: pointer;
        }

        .btn-signup:hover,
        .btn-signup:focus {
            transform: translateY(-2px);
            box-shadow: 0 8px 22px rgba(0, 240, 255, 0.5);
            color: var(--text-white);
        }

        /* FAB */
        .floating-fab {
            position: fixed;
            left: 20px;
            bottom: 90px;
            z-index: 95;
            width: 56px;
            height: 56px;
            border-radius: 50%;
            background: rgba(8, 9, 15, 0.7);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-image: linear-gradient(rgba(8,9,15,0.7), rgba(8,9,15,0.7)), linear-gradient(135deg, #00f0ff, #0052ff);
            background-origin: border-box;
            background-clip: padding-box, border-box;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--accent-cyan);
            font-size: 1.6rem;
            cursor: pointer;
            opacity: 0.7;
            box-shadow: 0 0 20px rgba(0, 240, 255, 0.4);
            transition: all var(--transition);
        }

        .floating-fab:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 35px rgba(0, 240, 255, 0.7);
            color: #ffffff;
        }

        .floating-fab:active {
            transform: scale(0.95);
        }

        /* Hero */
        .category-hero {
            padding: 80px 0 70px;
            background: radial-gradient(circle at 20% 20%, rgba(0, 82, 255, 0.18), transparent 45%),
                        radial-gradient(circle at 80% 80%, rgba(0, 240, 255, 0.12), transparent 40%),
                        var(--bg-deep);
            position: relative;
            overflow: hidden;
        }

        .category-hero::after {
            content: '';
            position: absolute;
            inset: 0;
            background-image: url('/assets/images/backpic/back-3.png');
            background-size: cover;
            background-position: center;
            opacity: 0.08;
            pointer-events: none;
        }

        .hero-grid {
            display: grid;
            grid-template-columns: 1.1fr 0.9fr;
            gap: 50px;
            align-items: center;
            position: relative;
            z-index: 2;
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: 8px;
            background: rgba(0, 240, 255, 0.1);
            border: 1px solid var(--border-glow);
            color: var(--accent-cyan);
            padding: 8px 16px;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: 0.3px;
            margin-bottom: 20px;
        }

        .hero-badge i {
            font-size: 0.9rem;
        }

        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin-bottom: 20px;
            background: linear-gradient(135deg, #ffffff 40%, #00f0ff 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }

        .hero-subtitle {
            font-size: 1.15rem;
            color: var(--text-silver);
            margin-bottom: 30px;
            max-width: 560px;
        }

        .hero-actions {
            display: flex;
            gap: 16px;
            flex-wrap: wrap;
            margin-bottom: 28px;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            font-weight: 700;
            padding: 14px 30px;
            border-radius: 50px;
            border: none;
            font-size: 1rem;
            transition: all var(--transition);
            box-shadow: 0 8px 20px rgba(0, 82, 255, 0.4);
            cursor: pointer;
        }

        .btn-primary:hover,
        .btn-primary:focus {
            transform: translateY(-3px);
            box-shadow: 0 12px 30px rgba(0, 240, 255, 0.55);
            color: #fff;
        }

        .btn-outline {
            background: transparent;
            color: var(--text-silver);
            font-weight: 700;
            padding: 14px 28px;
            border-radius: 50px;
            border: 1px solid var(--border-glow);
            font-size: 1rem;
            transition: all var(--transition);
            cursor: pointer;
        }

        .btn-outline:hover,
        .btn-outline:focus {
            background: rgba(0, 240, 255, 0.1);
            color: var(--text-white);
            border-color: var(--accent-cyan);
        }

        .trust-strip {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            color: var(--text-muted);
            font-size: 0.9rem;
            font-weight: 500;
        }

        .trust-strip i {
            color: var(--accent-cyan);
            margin-right: 6px;
        }

        .hero-visual {
            position: relative;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .hero-visual img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card), var(--shadow-glow);
            border: 1px solid var(--border-subtle);
            max-height: 420px;
            object-fit: cover;
            width: 100%;
        }

        .floating-stat {
            position: absolute;
            background: rgba(13, 17, 30, 0.9);
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-md);
            padding: 16px 20px;
            box-shadow: var(--shadow-card);
            display: flex;
            align-items: center;
            gap: 12px;
            font-weight: 600;
        }

        .floating-stat.top {
            top: -20px;
            right: -10px;
        }

        .floating-stat.bottom {
            bottom: -20px;
            left: -10px;
        }

        .floating-stat i {
            font-size: 1.8rem;
            color: var(--accent-cyan);
        }

        /* Section Shared */
        .section-padding {
            padding: 70px 0;
        }

        .section-title {
            font-size: 2rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            margin-bottom: 12px;
            color: var(--text-white);
        }

        .section-lead {
            color: var(--text-silver);
            font-size: 1.05rem;
            max-width: 680px;
            margin-bottom: 36px;
        }

        .divider {
            height: 1px;
            background: var(--border-subtle);
            margin: 40px 0;
        }

        /* Feature cards */
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 24px;
            margin-top: 30px;
        }

        .feature-card {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            transition: all var(--transition);
            position: relative;
            overflow: hidden;
        }

        .feature-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            opacity: 0;
            transition: opacity var(--transition);
        }

        .feature-card:hover::before {
            opacity: 1;
        }

        .feature-card:hover {
            transform: translateY(-6px);
            border-color: var(--border-glow);
            box-shadow: var(--shadow-card), var(--shadow-glow);
        }

        .feature-card i {
            font-size: 2rem;
            color: var(--accent-cyan);
            margin-bottom: 16px;
            display: block;
        }

        .feature-card h3 {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .feature-card p {
            color: var(--text-silver);
            font-size: 0.98rem;
            line-height: 1.6;
        }

        /* Formula panel */
        .formula-panel {
            background: var(--bg-card);
            border: 1px solid var(--border-glow);
            border-radius: var(--radius-lg);
            padding: 40px 35px;
            margin-top: 30px;
            box-shadow: var(--shadow-card);
        }

        .formula-panel h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 24px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .formula-panel h3 i {
            color: var(--accent-cyan);
        }

        .formula-block {
            background: rgba(0, 0, 0, 0.35);
            border-left: 4px solid var(--accent-cyan);
            padding: 22px 24px;
            border-radius: var(--radius-sm);
            margin-bottom: 20px;
            font-family: 'Consolas', 'Monaco', monospace;
            color: var(--accent-cyan);
            font-size: 1.1rem;
            word-break: break-word;
        }

        .formula-list {
            list-style: none;
            padding: 0;
        }

        .formula-list li {
            padding: 14px 0;
            border-bottom: 1px solid var(--border-subtle);
            display: flex;
            align-items: flex-start;
            gap: 14px;
            color: var(--text-silver);
            font-size: 1rem;
        }

        .formula-list li:last-child {
            border-bottom: none;
        }

        .formula-list li i {
            color: var(--accent-cyan);
            margin-top: 4px;
            min-width: 20px;
        }

        /* Steps */
        .steps-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
            gap: 26px;
            margin-top: 30px;
        }

        .step-item {
            background: var(--bg-card);
            border-radius: var(--radius-md);
            padding: 28px 24px;
            border: 1px solid var(--border-subtle);
            position: relative;
            transition: all var(--transition);
        }

        .step-item:hover {
            border-color: var(--border-glow);
            transform: translateY(-4px);
        }

        .step-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: rgba(0, 240, 255, 0.25);
            margin-bottom: 12px;
            line-height: 1;
        }

        .step-item h4 {
            font-size: 1.2rem;
            font-weight: 700;
            margin-bottom: 10px;
        }

        .step-item p {
            color: var(--text-silver);
            font-size: 0.95rem;
        }

        /* Comparison table-like */
        .insight-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            align-items: center;
            margin-top: 40px;
        }

        .insight-content h3 {
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 14px;
        }

        .insight-content p {
            color: var(--text-silver);
            font-size: 1.05rem;
            margin-bottom: 18px;
        }

        .insight-image img {
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-card);
            border: 1px solid var(--border-subtle);
        }

        /* FAQ */
        .faq-list {
            max-width: 820px;
            margin-top: 30px;
        }

        .faq-item {
            background: var(--bg-card);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            margin-bottom: 14px;
            overflow: hidden;
            transition: all var(--transition);
        }

        .faq-item:hover {
            border-color: var(--border-glow);
        }

        .faq-question {
            padding: 20px 24px;
            font-weight: 700;
            font-size: 1.05rem;
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            background: transparent;
            border: none;
            width: 100%;
            text-align: left;
            color: var(--text-white);
            transition: color var(--transition);
        }

        .faq-question:hover {
            color: var(--accent-cyan);
        }

        .faq-question i {
            transition: transform var(--transition);
            color: var(--accent-cyan);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.35s ease, padding 0.35s ease;
            color: var(--text-silver);
            padding: 0 24px;
            font-size: 0.98rem;
        }

        .faq-item.open .faq-answer {
            max-height: 400px;
            padding: 0 24px 22px;
        }

        .faq-item.open .faq-question i {
            transform: rotate(180deg);
        }

        /* CTA */
        .cta-section {
            background: radial-gradient(circle at 50% 50%, rgba(0, 82, 255, 0.25), transparent 60%),
                        var(--bg-navy);
            border-top: 1px solid var(--border-subtle);
            border-bottom: 1px solid var(--border-subtle);
        }

        .cta-box {
            text-align: center;
            padding: 60px 20px;
        }

        .cta-box h2 {
            font-size: 2.2rem;
            font-weight: 800;
            margin-bottom: 16px;
        }

        .cta-box p {
            color: var(--text-silver);
            font-size: 1.1rem;
            max-width: 600px;
            margin: 0 auto 28px;
        }

        /* Footer */
        .site-footer {
            background: var(--bg-deep);
            border-top: 1px solid var(--border-subtle);
            padding: 50px 0 30px;
            color: var(--text-silver);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.2fr 1fr 1fr;
            gap: 40px;
            margin-bottom: 30px;
        }

        .footer-brand {
            font-size: 1.5rem;
            font-weight: 800;
            color: var(--text-white);
            margin-bottom: 12px;
        }

        .footer-brand span {
            color: var(--accent-cyan);
        }

        .footer-desc {
            font-size: 0.95rem;
            color: var(--text-muted);
            max-width: 360px;
        }

        .footer-col h4 {
            color: var(--text-white);
            font-size: 1.1rem;
            font-weight: 700;
            margin-bottom: 16px;
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            margin-bottom: 10px;
            font-size: 0.95rem;
            transition: color var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
        }

        .footer-bottom {
            border-top: 1px solid var(--border-subtle);
            padding-top: 24px;
            text-align: center;
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        /* Responsive */
        @media screen and (max-width: 1024px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 40px;
            }

            .hero h1 {
                font-size: 2.4rem;
            }

            .insight-row {
                grid-template-columns: 1fr;
            }

            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media screen and (max-width: 768px) {
            .header-inner {
                flex-direction: column;
                align-items: stretch;
            }

            .main-nav {
                justify-content: center;
                gap: 4px;
            }

            .auth-buttons {
                justify-content: center;
            }

            .section-padding {
                padding: 50px 0;
            }

            .section-title {
                font-size: 1.7rem;
            }

            .hero h1 {
                font-size: 2rem;
            }

            .hero-subtitle {
                font-size: 1rem;
            }

            .floating-stat.top {
                top: -10px;
                right: 0;
            }

            .floating-stat.bottom {
                bottom: -10px;
                left: 0;
            }

            .floating-fab {
                left: 12px;
                bottom: 70px;
                width: 50px;
                height: 50px;
                font-size: 1.4rem;
            }

            .footer-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }

        @media screen and (max-width: 520px) {
            .main-nav {
                flex-wrap: wrap;
                justify-content: center;
            }

            .main-nav a {
                padding: 7px 12px;
                font-size: 0.85rem;
            }

            .hero-actions {
                flex-direction: column;
            }

            .btn-primary,
            .btn-outline {
                width: 100%;
                text-align: center;
            }

            .formula-panel {
                padding: 24px 20px;
            }

            .formula-block {
                font-size: 0.95rem;
                padding: 16px;
            }

            .cta-box h2 {
                font-size: 1.8rem;
            }
        }

/* roulang page: category2 */
:root {
            --primary-bg: #08090F;
            --secondary-bg: #0D111E;
            --accent-blue: #0052FF;
            --accent-cyan: #00F0FF;
            --text-white: #FFFFFF;
            --text-silver: #CBD5E1;
            --text-muted: #8A94A6;
            --border-glow: rgba(0, 240, 255, 0.35);
            --shadow-neon: 0 0 15px rgba(0, 240, 255, 0.5);
            --radius-sm: 8px;
            --radius-md: 16px;
            --radius-lg: 24px;
            --spacing-xs: 0.5rem;
            --spacing-sm: 1rem;
            --spacing-md: 1.5rem;
            --spacing-lg: 3rem;
            --spacing-xl: 5rem;
            --font-body: 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        *,
        *::before,
        *::after {
            box-sizing: border-box;
        }

        html {
            scroll-behavior: smooth;
            -webkit-text-size-adjust: 100%;
        }

        body {
            font-family: var(--font-body);
            background: var(--primary-bg);
            color: var(--text-white);
            line-height: 1.65;
            margin: 0;
            padding: 0;
            overflow-x: hidden;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }

        img {
            max-width: 100%;
            height: auto;
            display: block;
        }

        a {
            color: var(--accent-cyan);
            text-decoration: none;
            transition: var(--transition);
        }

        a:hover,
        a:focus {
            color: #66F5FF;
            text-decoration: none;
            outline: none;
        }

        a:focus-visible,
        button:focus-visible {
            outline: 2px solid var(--accent-cyan);
            outline-offset: 2px;
        }

        button,
        input,
        textarea {
            font-family: inherit;
        }

        h1,
        h2,
        h3,
        h4 {
            font-weight: 700;
            line-height: 1.3;
            margin: 0 0 var(--spacing-sm);
            color: var(--text-white);
        }

        h1 {
            font-size: 2.5rem;
            letter-spacing: -0.02em;
        }

        h2 {
            font-size: 2rem;
            letter-spacing: -0.01em;
        }

        h3 {
            font-size: 1.5rem;
        }

        h4 {
            font-size: 1.15rem;
        }

        p {
            margin: 0 0 var(--spacing-sm);
            color: var(--text-silver);
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--spacing-md);
        }

        /* Header / Navigation */
        .site-header {
            background: rgba(8, 9, 15, 0.92);
            backdrop-filter: blur(18px);
            -webkit-backdrop-filter: blur(18px);
            border-bottom: 1px solid rgba(0, 240, 255, 0.2);
            position: sticky;
            top: 0;
            z-index: 100;
            transition: var(--transition);
        }

        .site-header .container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding-top: 0.75rem;
            padding-bottom: 0.75rem;
        }

        .brand-logo {
            font-weight: 800;
            font-size: 1.35rem;
            color: var(--text-white);
            letter-spacing: -0.01em;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .brand-logo i {
            color: var(--accent-cyan);
            font-size: 1.6rem;
            filter: drop-shadow(0 0 6px rgba(0, 240, 255, 0.7));
        }

        .brand-logo span {
            color: var(--accent-cyan);
        }

        .main-nav {
            display: flex;
            align-items: center;
            gap: 1.25rem;
            flex-wrap: wrap;
        }

        .main-nav a {
            color: var(--text-silver);
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.4rem 0.6rem;
            border-radius: 6px;
            position: relative;
            transition: var(--transition);
            white-space: nowrap;
        }

        .main-nav a::after {
            content: '';
            position: absolute;
            left: 0.6rem;
            right: 0.6rem;
            bottom: 0.1rem;
            height: 2px;
            background: var(--accent-cyan);
            transform: scaleX(0);
            transform-origin: left;
            transition: transform 0.25s ease;
        }

        .main-nav a:hover::after,
        .main-nav a.active::after {
            transform: scaleX(1);
        }

        .main-nav a.active {
            color: var(--accent-cyan);
        }

        .nav-actions {
            display: flex;
            align-items: center;
            gap: 0.75rem;
        }

        .btn-login {
            background: transparent;
            color: var(--text-white);
            border: 1px solid rgba(255, 255, 255, 0.25);
            padding: 0.5rem 1.25rem;
            border-radius: 24px;
            font-weight: 600;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
            white-space: nowrap;
        }

        .btn-login:hover {
            border-color: var(--accent-cyan);
            color: var(--accent-cyan);
            background: rgba(0, 240, 255, 0.08);
        }

        .btn-signup {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            color: #fff;
            border: none;
            padding: 0.5rem 1.5rem;
            border-radius: 24px;
            font-weight: 700;
            font-size: 0.9rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(0, 82, 255, 0.4);
            white-space: nowrap;
        }

        .btn-signup:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 25px rgba(0, 240, 255, 0.5);
            color: #fff;
        }

        /* Hero */
        .hero-category {
            background: linear-gradient(160deg, #0D111E 0%, #08090F 70%),
                url('/assets/images/backpic/back-1.jpg') center/cover no-repeat;
            background-blend-mode: overlay;
            padding: var(--spacing-xl) 0 var(--spacing-lg);
            position: relative;
            overflow: hidden;
        }

        .hero-category::after {
            content: '';
            position: absolute;
            top: -20%;
            right: -10%;
            width: 500px;
            height: 500px;
            background: radial-gradient(circle, rgba(0, 240, 255, 0.12) 0%, transparent 70%);
            pointer-events: none;
        }

        .hero-category .container {
            position: relative;
            z-index: 2;
        }

        .hero-badge {
            display: inline-block;
            background: rgba(0, 240, 255, 0.12);
            color: var(--accent-cyan);
            font-weight: 600;
            font-size: 0.85rem;
            padding: 0.35rem 1rem;
            border-radius: 20px;
            border: 1px solid rgba(0, 240, 255, 0.3);
            margin-bottom: var(--spacing-sm);
        }

        .hero-category h1 {
            max-width: 800px;
            margin-bottom: var(--spacing-sm);
        }

        .hero-category .hero-desc {
            max-width: 680px;
            font-size: 1.1rem;
            color: var(--text-silver);
            margin-bottom: var(--spacing-md);
        }

        .hero-stats {
            display: flex;
            gap: 2.5rem;
            flex-wrap: wrap;
            margin-top: var(--spacing-md);
        }

        .hero-stat {
            display: flex;
            flex-direction: column;
        }

        .hero-stat .stat-number {
            font-size: 1.8rem;
            font-weight: 800;
            color: var(--accent-cyan);
            letter-spacing: -0.02em;
        }

        .hero-stat .stat-label {
            font-size: 0.85rem;
            color: var(--text-muted);
        }

        /* Main Sections */
        .section {
            padding: var(--spacing-xl) 0;
        }

        .section-alt {
            background: var(--secondary-bg);
        }

        .section-header {
            margin-bottom: var(--spacing-lg);
            max-width: 720px;
        }

        .section-header .section-tag {
            display: inline-block;
            font-weight: 700;
            font-size: 0.8rem;
            letter-spacing: 0.08em;
            text-transform: uppercase;
            color: var(--accent-cyan);
            margin-bottom: 0.5rem;
        }

        .section-header h2 {
            margin-bottom: 0.75rem;
        }

        .section-header p {
            color: var(--text-silver);
            font-size: 1.05rem;
        }

        /* Formula Card */
        .formula-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 1.5rem;
            margin-top: var(--spacing-md);
        }

        .formula-card {
            background: rgba(255, 255, 255, 0.03);
            border: 1px solid rgba(255, 255, 255, 0.08);
            border-radius: var(--radius-md);
            padding: 1.75rem;
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }

        .formula-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--accent-blue), var(--accent-cyan));
            opacity: 0;
            transition: var(--transition);
        }

        .formula-card:hover {
            border-color: var(--border-glow);
            transform: translateY(-6px);
            box-shadow: var(--shadow-neon);
        }

        .formula-card:hover::before {
            opacity: 1;
        }

        .formula-card .icon-wrap {
            width: 48px;
            height: 48px;
            border-radius: 12px;
            background: rgba(0, 240, 255, 0.12);
            display: flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1rem;
        }

        .formula-card .icon-wrap i {
            font-size: 1.4rem;
            color: var(--accent-cyan);
        }

        .formula-card h3 {
            font-size: 1.25rem;
            margin-bottom: 0.6rem;
        }

        .formula-card p {
            font-size: 0.95rem;
            color: var(--text-silver);
            margin-bottom: 0;
        }

        /* Process Steps */
        .steps-flow {
            display: flex;
            flex-direction: column;
            gap: 1.5rem;
            margin-top: var(--spacing-md);
        }

        .step-item {
            display: flex;
            align-items: flex-start;
            gap: 1.25rem;
            background: rgba(255, 255, 255, 0.03);
            border-radius: var(--radius-md);
            padding: 1.5rem;
            border-left: 3px solid var(--accent-cyan);
            transition: var(--transition);
        }

        .step-item:hover {
            background: rgba(0, 240, 255, 0.06);
        }

        .step-number {
            font-size: 1.6rem;
            font-weight: 800;
            color: var(--accent-cyan);
            min-width: 50px;
            text-align: center;
            background: rgba(0, 240, 255, 0.12);
            border-radius: 10px;
            padding: 0.35rem 0;
        }

        .step-content h4 {
            margin-bottom: 0.3rem;
        }

        .step-content p {
            margin-bottom: 0;
            font-size: 0.95rem;
        }

        /* Feature Image Block */
        .image-block {
            border-radius: var(--radius-lg);
            overflow: hidden;
            position: relative;
            box-shadow: 0 20px 50px rgba(0, 0, 0, 0.5);
        }

        .image-block img {
            width: 100%;
            height: 320px;
            object-fit: cover;
            transition: transform 0.6s ease;
        }

        .image-block:hover img {
            transform: scale(1.05);
        }

        .image-overlay {
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
            background: linear-gradient(0deg, rgba(8, 9, 15, 0.9) 0%, transparent 100%);
            padding: 2rem 1.5rem 1.25rem;
        }

        .image-overlay h3 {
            margin-bottom: 0.3rem;
        }

        .image-overlay p {
            color: var(--text-silver);
            font-size: 0.9rem;
            margin-bottom: 0;
        }

        /* FAQ */
        .faq-list {
            max-width: 850px;
            margin-top: var(--spacing-md);
        }

        .faq-item {
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding: 1.25rem 0;
            transition: var(--transition);
        }

        .faq-item:first-child {
            border-top: 1px solid rgba(255, 255, 255, 0.08);
        }

        .faq-question {
            display: flex;
            align-items: center;
            justify-content: space-between;
            cursor: pointer;
            font-weight: 600;
            color: var(--text-white);
            font-size: 1.05rem;
            gap: 1rem;
        }

        .faq-question i {
            color: var(--accent-cyan);
            transition: transform 0.3s ease;
            font-size: 1rem;
        }

        .faq-item.open .faq-question i {
            transform: rotate(45deg);
        }

        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s ease, padding 0.3s ease;
            color: var(--text-silver);
            font-size: 0.95rem;
        }

        .faq-item.open .faq-answer {
            max-height: 300px;
            padding-top: 0.75rem;
        }

        /* CTA */
        .cta-section {
            background: linear-gradient(135deg, var(--accent-blue), var(--accent-cyan));
            padding: var(--spacing-lg) 0;
            text-align: left;
            border-radius: 0;
        }

        .cta-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 2rem;
            flex-wrap: wrap;
        }

        .cta-inner h2 {
            color: #fff;
            margin-bottom: 0.5rem;
        }

        .cta-inner p {
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 0;
            font-size: 1.05rem;
        }

        .btn-cta {
            background: #fff;
            color: var(--accent-blue);
            border: none;
            padding: 0.9rem 2.2rem;
            border-radius: 32px;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.25);
            white-space: nowrap;
        }

        .btn-cta:hover {
            transform: translateY(-3px);
            box-shadow: 0 12px 30px rgba(0, 0, 0, 0.35);
            color: var(--accent-blue);
        }

        /* Footer */
        .site-footer {
            background: #05060A;
            border-top: 1px solid rgba(0, 240, 255, 0.15);
            padding: var(--spacing-lg) 0 var(--spacing-md);
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2.5rem;
            margin-bottom: var(--spacing-lg);
        }

        .footer-brand {
            font-weight: 800;
            font-size: 1.3rem;
            margin-bottom: 0.75rem;
        }

        .footer-brand span {
            color: var(--accent-cyan);
        }

        .footer-desc {
            font-size: 0.9rem;
            color: var(--text-muted);
            max-width: 380px;
        }

        .footer-col h4 {
            font-size: 1rem;
            margin-bottom: 1rem;
            color: var(--text-white);
        }

        .footer-col a {
            display: block;
            color: var(--text-muted);
            font-size: 0.9rem;
            margin-bottom: 0.6rem;
            transition: var(--transition);
        }

        .footer-col a:hover {
            color: var(--accent-cyan);
            transform: translateX(4px);
        }

        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            padding-top: var(--spacing-md);
            font-size: 0.85rem;
            color: var(--text-muted);
            text-align: left;
        }

        /* FAB */
        .fab-cyber {
            position: fixed;
            left: 1.5rem;
            bottom: 6rem;
            z-index: 90;
            width: 56px;
            height: 56px;
            border-radius: 16px;
            background: rgba(0, 0, 0, 0.65);
            backdrop-filter: blur(12px);
            -webkit-backdrop-filter: blur(12px);
            border: 2px solid transparent;
            background-clip: padding-box;
            position: relative;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            transition: var(--transition);
            box-shadow: 0 0 15px rgba(0, 240, 255, 0.5);
            opacity: 0.7;
            animation: fabBreathe 3s ease-in-out infinite;
        }

        .fab-cyber::before {
            content: '';
            position: absolute;
            inset: -2px;
            border-radius: 16px;
            padding: 2px;
            background: linear-gradient(135deg, #00F0FF, #0052FF, #FF007F);
            -webkit-mask: linear-gradient(#fff 0 0) content-box, linear-gradient(#fff 0 0);
            -webkit-mask-composite: xor;
            mask-composite: exclude;
            pointer-events: none;
        }

        .fab-cyber i {
            color: var(--accent-cyan);
            font-size: 1.5rem;
            filter: drop-shadow(0 0 8px rgba(0, 240, 255, 0.9));
            transition: var(--transition);
        }

        .fab-cyber:hover {
            opacity: 1;
            transform: scale(1.1);
            box-shadow: 0 0 25px rgba(0, 240, 255, 0.8);
        }

        .fab-cyber:hover i {
            animation: flicker 0.3s ease;
        }

        .fab-cyber:active {
            transform: scale(0.92);
            border-color: #FF007F;
        }

        @keyframes fabBreathe {
            0%, 100% { opacity: 0.7; }
            50% { opacity: 0.55; }
        }

        @keyframes flicker {
            0% { opacity: 0.4; }
            50% { opacity: 1; }
            100% { opacity: 0.7; }
        }

        /* Responsive */
        @media (max-width: 1024px) {
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.8rem; }
            .footer-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 768px) {
            .site-header .container {
                flex-direction: column;
                align-items: stretch;
                gap: 0.5rem;
            }
            .main-nav {
                justify-content: flex-start;
                gap: 0.6rem;
                overflow-x: auto;
                -webkit-overflow-scrolling: touch;
                padding-bottom: 0.25rem;
            }
            .nav-actions {
                position: absolute;
                top: 0.75rem;
                right: 1rem;
            }
            .brand-logo {
                font-size: 1.15rem;
                padding-right: 10rem;
            }
            h1 { font-size: 1.9rem; }
            h2 { font-size: 1.6rem; }
            .hero-category {
                padding: var(--spacing-lg) 0 var(--spacing-md);
            }
            .hero-stats {
                gap: 1.5rem;
            }
            .formula-grid {
                grid-template-columns: 1fr;
            }
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .cta-inner {
                flex-direction: column;
                align-items: flex-start;
            }
            .fab-cyber {
                left: 1rem;
                bottom: 5rem;
                width: 48px;
                height: 48px;
                border-radius: 14px;
            }
            .fab-cyber i {
                font-size: 1.3rem;
            }
        }

        @media (max-width: 520px) {
            .container {
                padding: 0 1rem;
            }
            h1 { font-size: 1.6rem; }
            h2 { font-size: 1.4rem; }
            .hero-category .hero-desc {
                font-size: 1rem;
            }
            .hero-stats {
                flex-direction: column;
                gap: 0.75rem;
            }
            .btn-login,
            .btn-signup {
                padding: 0.4rem 0.9rem;
                font-size: 0.8rem;
            }
            .brand-logo {
                font-size: 1rem;
                padding-right: 8.5rem;
            }
            .formula-card {
                padding: 1.25rem;
            }
            .step-item {
                flex-direction: column;
                gap: 0.75rem;
                padding: 1.25rem;
            }
            .step-number {
                min-width: 40px;
                font-size: 1.3rem;
            }
            .image-block img {
                height: 220px;
            }
            .faq-question {
                font-size: 0.95rem;
            }
        }