*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --bg: #0b0e14;
            --surface: #151a24;
            --surface-2: #1c2330;
            --text: #e2e8f0;
            --muted: #94a3b8;
            --primary: #f59e0b;
            --primary-2: #fbbf24;
            --accent: #8b5cf6;
            --success: #10b981;
            --danger: #ef4444;
            --border: rgba(255, 255, 255, 0.06);
            --radius: 18px;
            --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
            --container: 1200px;
            --gradient: linear-gradient(135deg, #f59e0b, #f97316, #db2777);
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
            overflow-x: hidden;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: var(--radius);
        }
        a {
            color: var(--primary-2);
            text-decoration: none;
            border-bottom: 1px solid transparent;
            transition: border-color .2s, color .2s;
        }
        a:hover {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .container {
            max-width: var(--container);
            margin-inline: auto;
            padding-inline: 20px;
        }
        .site-header {
            background: rgba(11, 14, 20, 0.85);
            backdrop-filter: blur(14px);
            -webkit-backdrop-filter: blur(14px);
            border-bottom: 1px solid var(--border);
            position: sticky;
            top: 0;
            z-index: 200;
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px;
            padding-block: 14px;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            background: var(--gradient);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            border-bottom: none;
        }
        .my-logo:hover {
            opacity: 0.85;
            border-bottom: none;
        }
        .nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            list-style: none;
            flex-wrap: wrap;
        }
        .nav-links li a {
            display: inline-block;
            padding: 8px 18px;
            border-radius: 40px;
            font-size: 0.92rem;
            font-weight: 600;
            color: var(--text);
            background: transparent;
            border: 1px solid var(--border);
            transition: all .2s;
        }
        .nav-links li a:hover {
            background: var(--primary);
            color: #0b0e14;
            border-color: var(--primary);
        }
        .nav-links li a i {
            margin-right: 6px;
        }
        .hamburger {
            display: none;
            background: none;
            border: 1px solid var(--border);
            border-radius: 10px;
            padding: 8px 12px;
            color: var(--text);
            font-size: 1.4rem;
            cursor: pointer;
            line-height: 1;
        }
        .breadcrumb-wrap {
            background: rgba(255, 255, 255, 0.02);
            border-bottom: 1px solid var(--border);
            padding: 10px 0;
            font-size: 0.85rem;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 4px;
            list-style: none;
        }
        .breadcrumb li:not(:last-child)::after {
            content: "→";
            margin-inline: 8px;
            color: var(--muted);
        }
        .breadcrumb a {
            color: var(--muted);
        }
        .breadcrumb li:last-child a {
            color: var(--text);
            font-weight: 600;
        }
        .hero {
            padding: 50px 0 30px;
            text-align: center;
        }
        .hero h1 {
            font-size: clamp(2.2rem, 6vw, 4rem);
            line-height: 1.15;
            margin-bottom: 14px;
            font-weight: 800;
            letter-spacing: -0.03em;
            background: linear-gradient(135deg, #f59e0b, #f97316, #db2777);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .hero .subhead {
            font-size: 1.2rem;
            color: var(--muted);
            max-width: 800px;
            margin: 0 auto 30px;
        }
        .hero-meta {
            display: flex;
            justify-content: center;
            gap: 20px;
            flex-wrap: wrap;
            font-size: 0.85rem;
            color: var(--muted);
        }
        .tagline-badge {
            display: inline-block;
            background: rgba(245, 158, 11, 0.12);
            border-radius: 40px;
            padding: 6px 18px;
            font-weight: 600;
            color: var(--primary-2);
            border: 1px solid rgba(245, 158, 11, 0.2);
            margin-bottom: 20px;
        }
        .section {
            padding: 30px 0;
        }
        h2 {
            font-size: 2rem;
            margin-top: 2.2em;
            margin-bottom: 0.8em;
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.02em;
            color: #fff;
            position: relative;
            padding-left: 18px;
        }
        h2::before {
            content: '';
            position: absolute;
            left: 0;
            top: 0.2em;
            width: 5px;
            height: 0.9em;
            background: var(--gradient);
            border-radius: 4px;
        }
        h3 {
            font-size: 1.4rem;
            margin-top: 1.6em;
            margin-bottom: 0.6em;
            font-weight: 700;
            color: #fff;
        }
        h4 {
            font-size: 1.15rem;
            margin-top: 1.2em;
            margin-bottom: 0.4em;
            font-weight: 600;
            color: var(--primary-2);
        }
        p {
            margin-bottom: 1.2em;
            color: #cdd5e2;
        }
        ul,
        ol {
            margin: 0 0 1.5em 1.2em;
            color: #cdd5e2;
        }
        li {
            margin-bottom: 0.5em;
        }
        .highlight-box {
            background: linear-gradient(145deg, rgba(245, 158, 11, 0.12), rgba(139, 92, 246, 0.08));
            border-left: 4px solid var(--primary);
            padding: 22px 26px;
            border-radius: 0 16px 16px 0;
            margin: 26px 0;
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 16px;
            margin: 25px 0;
        }
        .stat-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 20px;
            text-align: center;
            transition: all .25s;
        }
        .stat-card:hover {
            transform: translateY(-4px);
            background: var(--surface-2);
            border-color: var(--primary);
        }
        .stat-card i {
            font-size: 2rem;
            color: var(--primary);
            margin-bottom: 8px;
        }
        .stat-card strong {
            display: block;
            font-size: 1.5rem;
            color: #fff;
        }
        .stat-card span {
            font-size: 0.8rem;
            color: var(--muted);
        }
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
            gap: 20px;
            margin: 30px 0;
        }
        .tactic-card {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 22px;
            transition: all .25s;
        }
        .tactic-card:hover {
            border-color: var(--accent);
            transform: translateY(-3px);
        }
        .tactic-card i {
            font-size: 2rem;
            color: var(--accent);
            margin-bottom: 10px;
        }
        .tactic-card h3 {
            margin-top: 0;
        }
        .interactive-demo {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px;
            margin: 30px 0;
        }
        .toolbar {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            margin-bottom: 20px;
        }
        .btn {
            background: transparent;
            border: 1px solid var(--border);
            color: var(--text);
            padding: 8px 16px;
            border-radius: 8px;
            cursor: pointer;
            transition: all .2s;
            font-size: 0.9rem;
        }
        .btn:hover {
            background: var(--primary);
            color: #0b0e14;
            border-color: var(--primary);
        }
        .btn-primary {
            background: var(--primary);
            border-color: var(--primary);
            color: #0b0e14;
            font-weight: 700;
        }
        .btn-primary:hover {
            background: var(--primary-2);
        }
        .search-block {
            background: var(--surface);
            border-radius: var(--radius);
            padding: 28px;
            border: 1px solid var(--border);
            margin: 40px 0;
        }
        .search-form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .search-form input {
            flex: 1;
            min-width: 200px;
            padding: 14px 18px;
            border-radius: 12px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            background: var(--bg);
            color: var(--text);
            font-size: 1rem;
            outline: none;
        }
        .search-form input:focus {
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(245, 158, 11, 0.2);
        }
        .search-form button {
            background: var(--primary);
            border: none;
            border-radius: 12px;
            padding: 14px 26px;
            font-weight: 700;
            cursor: pointer;
            color: #0b0e14;
            font-size: 1rem;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin: 40px 0;
        }
        @media (max-width: 768px) {
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        .feedback-panel {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 28px;
        }
        .feedback-panel h3 {
            margin-top: 0;
        }
        .form-row {
            margin-bottom: 16px;
        }
        .form-row label {
            display: block;
            font-size: 0.85rem;
            font-weight: 600;
            margin-bottom: 6px;
            color: var(--muted);
        }
        .form-row input,
        .form-row textarea,
        .form-row select {
            width: 100%;
            padding: 12px 14px;
            border-radius: 10px;
            border: 1px solid var(--border);
            background: var(--bg);
            color: var(--text);
            font-size: 0.95rem;
            outline: none;
        }
        .form-row textarea {
            min-height: 110px;
            resize: vertical;
        }
        .form-row input:focus,
        .form-row textarea:focus,
        .form-row select:focus {
            border-color: var(--primary);
        }
        .star-rating {
            display: flex;
            gap: 4px;
            font-size: 1.6rem;
            cursor: pointer;
            user-select: none;
        }
        .star-rating i {
            color: #475569;
            transition: color .2s;
        }
        .star-rating i.active {
            color: var(--primary);
        }
        .faq-item {
            background: var(--surface);
            border-radius: 14px;
            border: 1px solid var(--border);
            padding: 22px;
            margin-bottom: 16px;
        }
        .faq-item h4 {
            margin: 0 0 8px;
            color: var(--primary-2);
        }
        .site-footer {
            background: #0a0d12;
            border-top: 1px solid var(--border);
            padding: 50px 0 20px;
            margin-top: 60px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }
        @media (max-width: 768px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        .site-footer h4 {
            color: #fff;
            margin-bottom: 14px;
        }
        .site-footer a {
            color: var(--muted);
        }
        .friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.03);
            border-radius: 12px;
            padding: 18px 22px;
            border: 1px solid var(--border);
        }
        .copyright {
            border-top: 1px solid var(--border);
            padding-top: 24px;
            margin-top: 24px;
            text-align: center;
            font-size: 0.85rem;
            color: #64748b;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            background: var(--primary);
            color: #0b0e14;
            border: none;
            font-size: 1.2rem;
            cursor: pointer;
            display: none;
            align-items: center;
            justify-content: center;
            box-shadow: var(--shadow);
            z-index: 99;
        }
        .back-to-top.visible {
            display: flex;
        }
        .toc {
            background: var(--surface);
            border-radius: var(--radius);
            border: 1px solid var(--border);
            padding: 24px 30px;
            margin: 30px 0;
        }
        .toc h3 {
            margin: 0 0 12px;
        }
        .toc ol {
            margin: 0;
            padding-left: 20px;
        }
        .toc a {
            color: var(--text);
        }
        .toc a:hover {
            color: var(--primary);
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
                flex-direction: column;
                width: 100%;
                padding: 15px 0;
                border-top: 1px solid var(--border);
            }
            .nav-links.active {
                display: flex;
            }
            .navbar-collapse {
                position: relative;
            }
            .hamburger {
                display: inline-block;
            }
        }
        blockquote {
            background: rgba(139, 92, 246, 0.08);
            border-left: 4px solid var(--accent);
            padding: 18px 22px;
            border-radius: 0 14px 14px 0;
            font-style: italic;
            margin: 20px 0;
        }
        blockquote cite {
            display: block;
            font-size: 0.85rem;
            margin-top: 10px;
            color: var(--muted);
        }
        table {
            width: 100%;
            border-collapse: collapse;
            margin: 20px 0;
            font-size: 0.9rem;
        }
        th,
        td {
            text-align: left;
            padding: 12px 14px;
            border-bottom: 1px solid var(--border);
        }
        th {
            background: rgba(255, 255, 255, 0.03);
            color: #fff;
            font-weight: 600;
        }
        tr:hover {
            background: rgba(255, 255, 255, 0.02);
        }
        .reveal {
            opacity: 0;
            transform: translateY(20px);
            transition: opacity .6s, transform .6s;
        }
        .reveal.in-view {
            opacity: 1;
            transform: none;
        }