*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f4f7fa;
            color: #1e293b;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #0e7c6b;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #064e3b;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 24px;
            padding: 1.5rem 2rem 2rem;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.04);
            margin-top: 1rem;
            margin-bottom: 2rem;
        }
        @media (max-width: 640px) {
            .container {
                padding: 1rem 1.2rem 1.5rem;
                border-radius: 16px;
                margin-top: 0.5rem;
            }
            body {
                padding: 0 0.5rem;
            }
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 1.2rem;
            border-bottom: 2px solid #e9edf2;
            margin-bottom: 1.2rem;
            position: relative;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #0f766e, #14b8a6);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo i {
            font-size: 2.2rem;
            -webkit-text-fill-color: #0f766e;
            color: #0f766e;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            -webkit-text-fill-color: #64748b;
            color: #64748b;
            letter-spacing: 0.02em;
            display: block;
            margin-top: -0.2rem;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 1.2rem;
        }
        .main-nav {
            display: flex;
            gap: 0.6rem 1.2rem;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .main-nav li a {
            font-weight: 600;
            font-size: 0.95rem;
            padding: 0.4rem 0.8rem;
            border-radius: 40px;
            background: transparent;
            transition: background 0.2s, color 0.2s;
            color: #1e293b;
        }
        .main-nav li a:hover,
        .main-nav li a:focus-visible {
            background: #e2f0ef;
            color: #0f766e;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #1e293b;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #e9edf2;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #ffffff;
                border: 1px solid #e2e8f0;
                border-radius: 16px;
                padding: 0.8rem 0.6rem;
                margin-top: 0.8rem;
                box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
                position: absolute;
                top: 100%;
                left: 0;
                right: 0;
                z-index: 50;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav li a {
                padding: 0.6rem 1rem;
                border-radius: 8px;
            }
            .site-header {
                position: relative;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.8rem;
            font-size: 0.88rem;
            color: #64748b;
            padding: 0.6rem 0 1rem 0;
            border-bottom: 1px solid #edf2f7;
            margin-bottom: 1.5rem;
            list-style: none;
        }
        .breadcrumb li {
            display: inline;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #94a3b8;
            font-weight: 600;
        }
        .breadcrumb a {
            color: #0f766e;
        }
        .breadcrumb .active {
            color: #1e293b;
            font-weight: 500;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            letter-spacing: -0.02em;
            margin: 0 0 0.8rem 0;
            color: #0f172a;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin: 2.8rem 0 1rem 0;
            padding-bottom: 0.4rem;
            border-bottom: 3px solid #e2f0ef;
            color: #0f172a;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin: 2rem 0 0.8rem 0;
            color: #1e293b;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 1.4rem 0 0.5rem 0;
            color: #334155;
        }
        p {
            margin-bottom: 1.1rem;
        }
        .lead {
            font-size: 1.2rem;
            color: #334155;
            font-weight: 400;
            max-width: 780px;
        }
        .highlight {
            background: #f0fdfa;
            padding: 0.1rem 0.4rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .feature-img {
            margin: 2rem 0 1.8rem;
            border-radius: 16px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            background: #f1f5f9;
        }
        .feature-img figcaption {
            font-size: 0.9rem;
            color: #64748b;
            text-align: center;
            padding: 0.6rem 0 0;
            font-style: italic;
        }
        .insight-box {
            background: #f8fafc;
            border-left: 5px solid #14b8a6;
            padding: 1.2rem 1.6rem;
            border-radius: 12px;
            margin: 1.8rem 0;
        }
        .insight-box strong {
            color: #0f766e;
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 1.2rem;
            margin: 1.6rem 0;
        }
        .stat-card {
            background: #f1f5f9;
            padding: 1.2rem 1rem;
            border-radius: 16px;
            text-align: center;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .stat-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.05);
        }
        .stat-card .number {
            font-size: 2.2rem;
            font-weight: 800;
            color: #0f766e;
            display: block;
            line-height: 1.2;
        }
        .stat-card .label {
            font-size: 0.9rem;
            color: #475569;
            margin-top: 0.3rem;
        }
        .form-card {
            background: #f8fafc;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            margin: 2.2rem 0;
            border: 1px solid #e9edf2;
        }
        .form-card h3 {
            margin-top: 0;
            border-bottom: none;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            font-size: 0.95rem;
            margin-bottom: 0.3rem;
            color: #1e293b;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.75rem 1rem;
            border: 1.5px solid #d1d9e6;
            border-radius: 12px;
            font-size: 1rem;
            font-family: inherit;
            background: #ffffff;
            transition: border 0.2s, box-shadow 0.2s;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            outline: none;
            border-color: #14b8a6;
            box-shadow: 0 0 0 4px rgba(20, 184, 166, 0.12);
        }
        .form-group textarea {
            resize: vertical;
            min-height: 100px;
        }
        .btn {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #0f766e;
            color: #fff;
            font-weight: 600;
            font-size: 1rem;
            padding: 0.75rem 2rem;
            border: none;
            border-radius: 40px;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .btn:hover {
            background: #064e3b;
            transform: scale(1.01);
            text-decoration: none;
        }
        .btn:active {
            transform: scale(0.97);
        }
        .btn-secondary {
            background: #e2e8f0;
            color: #1e293b;
        }
        .btn-secondary:hover {
            background: #cbd5e1;
            color: #0f172a;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            font-size: 2rem;
            cursor: pointer;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            color: #d1d9e6;
            transition: color 0.15s;
            cursor: pointer;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f59e0b;
        }
        .comment-item {
            background: #f1f5f9;
            padding: 1rem 1.4rem;
            border-radius: 14px;
            margin-bottom: 0.8rem;
        }
        .comment-item strong {
            color: #0f766e;
        }
        .comment-item .meta {
            font-size: 0.85rem;
            color: #64748b;
            margin-top: 0.2rem;
        }
        friend-link {
            display: block;
            padding: 1.5rem 0 0.8rem;
            margin-top: 2rem;
            border-top: 2px solid #e9edf2;
        }
        friend-link .fl-head {
            font-weight: 700;
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
            color: #0f172a;
        }
        friend-link .fl-list {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem 1.6rem;
            list-style: none;
            padding: 0;
        }
        friend-link .fl-list li a {
            color: #0f766e;
            font-weight: 500;
        }
        .site-footer {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 2px solid #e9edf2;
            text-align: center;
            color: #64748b;
            font-size: 0.9rem;
        }
        .site-footer .copyright {
            font-weight: 400;
            margin-top: 0.6rem;
        }
        .last-updated {
            display: inline-block;
            background: #e2f0ef;
            padding: 0.3rem 1rem;
            border-radius: 40px;
            font-size: 0.85rem;
            color: #0f766e;
            font-weight: 500;
            margin-bottom: 1.2rem;
        }
        .toc {
            background: #f8fafc;
            padding: 1.4rem 1.8rem;
            border-radius: 18px;
            margin: 1.6rem 0 2rem;
            border: 1px solid #e9edf2;
        }
        .toc summary {
            font-weight: 700;
            font-size: 1.2rem;
            cursor: pointer;
            color: #0f172a;
        }
        .toc ol {
            margin-top: 0.8rem;
            columns: 2 220px;
            column-gap: 2rem;
        }
        .toc ol li {
            break-inside: avoid;
            margin-bottom: 0.3rem;
        }
        .toc ol li a {
            color: #0f766e;
        }
        .tag {
            display: inline-block;
            background: #e2f0ef;
            padding: 0.15rem 0.7rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #0f766e;
            font-weight: 500;
        }
        @media (max-width: 640px) {
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .form-card {
                padding: 1.2rem 1.2rem;
            }
            .stat-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        .schema-hidden {
            display: none;
        }