*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #2c3e7a;
            --primary-light: #3f5aa8;
            --secondary: #e85d3a;
            --accent: #f0a830;
            --bg: #faf9f6;
            --bg-card: #ffffff;
            --text: #1a1a2e;
            --text-light: #4a4a6a;
            --border: #e0dfd7;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            --radius: 16px;
            --radius-sm: 8px;
            --max-width: 1200px;
            --header-h: 72px;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            padding-top: var(--header-h);
        }
        a {
            color: var(--primary);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--secondary);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius-sm);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: var(--header-h);
            background: var(--bg-card);
            border-bottom: 1px solid var(--border);
            z-index: 1000;
            display: flex;
            align-items: center;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            width: 100%;
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            gap: 16px;
        }
        .my-logo {
            font-size: 1.5rem;
            font-weight: 800;
            letter-spacing: -0.03em;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 6px;
            flex-shrink: 0;
        }
        .my-logo span {
            color: var(--secondary);
        }
        .my-logo i {
            font-size: 1.4rem;
            color: var(--accent);
        }
        .nav-main {
            display: flex;
            align-items: center;
            gap: 24px;
        }
        .nav-main a {
            font-size: 0.92rem;
            font-weight: 500;
            color: var(--text-light);
            padding: 6px 0;
            border-bottom: 2px solid transparent;
            transition: 0.2s;
        }
        .nav-main a:hover,
        .nav-main a.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.6rem;
            color: var(--primary);
            cursor: pointer;
            padding: 4px 8px;
            border-radius: var(--radius-sm);
        }
        .hamburger:hover {
            background: rgba(0, 0, 0, 0.04);
        }
        .breadcrumb {
            padding: 16px 0 4px;
            font-size: 0.85rem;
            color: var(--text-light);
            display: flex;
            flex-wrap: wrap;
            gap: 6px 10px;
            list-style: none;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 10px;
            color: #aaa;
        }
        .breadcrumb a {
            color: var(--primary-light);
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 20px 0 60px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
        }
        .content-main {
            min-width: 0;
        }
        .sidebar {
            position: sticky;
            top: calc(var(--header-h) + 24px);
            align-self: start;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--primary);
            margin: 0 0 12px;
            letter-spacing: -0.02em;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            color: var(--primary);
            margin: 48px 0 16px;
            padding-bottom: 6px;
            border-bottom: 3px solid var(--accent);
            letter-spacing: -0.01em;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--primary-light);
            margin: 32px 0 12px;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            color: var(--text);
            margin: 24px 0 8px;
        }
        p {
            margin: 0 0 18px;
            color: var(--text-light);
        }
        .lead {
            font-size: 1.2rem;
            color: var(--text);
            font-weight: 500;
            margin-bottom: 28px;
            border-left: 4px solid var(--accent);
            padding-left: 20px;
        }
        .emoji {
            font-style: normal;
        }
        strong {
            color: var(--text);
            font-weight: 600;
        }
        .highlight-box {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 28px 32px;
            margin: 32px 0;
            box-shadow: var(--shadow);
            border-left: 4px solid var(--secondary);
        }
        .highlight-box h4 {
            margin-top: 0;
        }
        .feature-img {
            margin: 32px 0;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
            background: var(--bg-card);
            padding: 8px;
        }
        .feature-img img {
            border-radius: calc(var(--radius) - 4px);
            width: 100%;
        }
        .feature-img figcaption {
            text-align: center;
            font-size: 0.9rem;
            color: var(--text-light);
            padding: 10px 0 4px;
            font-style: italic;
        }
        .link-list {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px 20px;
            box-shadow: var(--shadow);
            margin-bottom: 28px;
        }
        .link-list h4 {
            margin: 0 0 14px;
            font-size: 1.1rem;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .link-list ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .link-list li {
            padding: 6px 0;
            border-bottom: 1px solid var(--border);
            font-size: 0.92rem;
        }
        .link-list li:last-child {
            border-bottom: none;
        }
        .link-list a {
            color: var(--text-light);
            display: block;
            padding: 4px 0;
        }
        .link-list a:hover {
            color: var(--secondary);
            padding-left: 4px;
        }
        .search-block {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px 20px;
            box-shadow: var(--shadow);
            margin-bottom: 28px;
        }
        .search-block form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
        }
        .search-block input[type="text"] {
            flex: 1;
            min-width: 160px;
            padding: 12px 18px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 1rem;
            outline: none;
            transition: border-color 0.2s;
        }
        .search-block input[type="text"]:focus {
            border-color: var(--primary);
        }
        .search-block button {
            padding: 12px 24px;
            background: var(--primary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .search-block button:hover {
            background: var(--primary-light);
            transform: translateY(-1px);
        }
        .search-block button i {
            margin-right: 6px;
        }
        .interact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 40px 0;
        }
        .interact-card {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 24px 28px;
            box-shadow: var(--shadow);
        }
        .interact-card h4 {
            margin: 0 0 16px;
            display: flex;
            align-items: center;
            gap: 10px;
            font-size: 1.15rem;
        }
        .interact-card form {
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .interact-card input,
        .interact-card textarea,
        .interact-card select {
            padding: 10px 14px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-family: inherit;
            outline: none;
            transition: border-color 0.2s;
            background: var(--bg);
        }
        .interact-card input:focus,
        .interact-card textarea:focus,
        .interact-card select:focus {
            border-color: var(--primary);
        }
        .interact-card textarea {
            min-height: 90px;
            resize: vertical;
        }
        .interact-card button {
            align-self: flex-start;
            padding: 10px 28px;
            background: var(--secondary);
            color: #fff;
            border: none;
            border-radius: var(--radius-sm);
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .interact-card button:hover {
            background: #d04d2a;
            transform: translateY(-1px);
        }
        .rating-stars {
            display: flex;
            gap: 6px;
            font-size: 1.6rem;
            color: #ddd;
            cursor: pointer;
            direction: rtl;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            cursor: pointer;
            transition: color 0.15s;
            color: #ddd;
        }
        .rating-stars label:hover,
        .rating-stars label:hover~label,
        .rating-stars input:checked~label {
            color: var(--accent);
        }
        footer {
            background: var(--primary);
            color: #e8e8f0;
            padding: 48px 0 32px;
            margin-top: 60px;
        }
        footer a {
            color: #f0c8a8;
        }
        footer a:hover {
            color: #fff;
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 40px;
        }
        .footer-inner h5 {
            color: #fff;
            font-size: 1.1rem;
            margin-bottom: 16px;
            font-weight: 600;
        }
        .footer-inner p,
        .footer-inner li {
            font-size: 0.92rem;
            color: #d0d0e0;
        }
        .footer-inner ul {
            list-style: none;
            padding: 0;
        }
        .footer-inner li {
            padding: 4px 0;
        }
        friend-link {
            display: block;
            margin-top: 12px;
            font-size: 0.92rem;
        }
        friend-link a {
            display: inline-block;
            margin-right: 16px;
            padding: 4px 0;
        }
        .copyright {
            grid-column: 1 / -1;
            border-top: 1px solid rgba(255, 255, 255, 0.12);
            padding-top: 24px;
            margin-top: 16px;
            text-align: center;
            font-size: 0.85rem;
            color: #b0b0c8;
        }
        .copyright strong {
            color: #e0d8f0;
        }
        @media (max-width: 1024px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                order: 2;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 20px;
            }
            .sidebar .link-list,
            .sidebar .search-block {
                margin-bottom: 0;
            }
        }
        @media (max-width: 768px) {
            :root {
                --header-h: 64px;
            }
            .hamburger {
                display: block;
            }
            .nav-main {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: var(--bg-card);
                flex-direction: column;
                padding: 20px 24px;
                gap: 6px;
                border-bottom: 2px solid var(--border);
                box-shadow: 0 12px 40px rgba(0, 0, 0, 0.08);
                display: none;
                z-index: 999;
            }
            .nav-main.open {
                display: flex;
            }
            .nav-main a {
                padding: 12px 0;
                font-size: 1rem;
                border-bottom: 1px solid var(--border);
                width: 100%;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .interact-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 28px;
            }
            .highlight-box {
                padding: 20px 18px;
            }
            .search-block form {
                flex-direction: column;
            }
            .search-block button {
                width: 100%;
                justify-content: center;
            }
            .breadcrumb {
                font-size: 0.78rem;
                overflow-x: auto;
                white-space: nowrap;
                padding-bottom: 8px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            h1 {
                font-size: 1.7rem;
            }
            .my-logo {
                font-size: 1.2rem;
            }
            .rating-stars {
                font-size: 1.3rem;
            }
        }
        .sr-only {
            position: absolute;
            width: 1px;
            height: 1px;
            padding: 0;
            margin: -1px;
            overflow: hidden;
            clip: rect(0, 0, 0, 0);
            white-space: nowrap;
            border: 0;
        }
        .last-updated {
            font-size: 0.88rem;
            color: var(--text-light);
            background: var(--bg-card);
            display: inline-block;
            padding: 4px 16px;
            border-radius: 30px;
            border: 1px solid var(--border);
            margin-bottom: 20px;
        }
        .last-updated i {
            margin-right: 6px;
            color: var(--accent);
        }
        .toc {
            background: var(--bg-card);
            border-radius: var(--radius);
            padding: 20px 24px;
            box-shadow: var(--shadow);
            margin: 24px 0 32px;
        }
        .toc h4 {
            margin: 0 0 12px;
        }
        .toc ul {
            columns: 2 220px;
            list-style: none;
            padding: 0;
        }
        .toc li {
            padding: 3px 0;
        }
        .toc a {
            font-size: 0.92rem;
        }
        @media (max-width: 500px) {
            .toc ul {
                columns: 1;
            }
        }