*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c4a6a;
            --accent: #e8a87c;
            --accent-hover: #d4895e;
            --bg: #f7f4f0;
            --card-bg: #ffffff;
            --text: #1e1e1e;
            --text-light: #4a4a4a;
            --border: #d6d0ca;
            --radius: 8px;
            --shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            --font: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            --max-width: 1140px;
            --header-bg: #0f1a24;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: var(--accent-hover);
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--header-bg);
            color: #f0ede8;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 12px 20px;
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            color: #f0ede8;
            background: linear-gradient(135deg, #e8a87c, #c9a87c);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: opacity 0.2s;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            -webkit-text-fill-color: #aaa;
            display: block;
            letter-spacing: 1px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 1px solid rgba(255, 255, 255, 0.25);
            color: #f0ede8;
            font-size: 1.5rem;
            padding: 6px 14px;
            border-radius: 6px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .main-nav {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #d6d0ca;
            padding: 6px 14px;
            border-radius: 20px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            text-decoration: none;
        }
        .main-nav a.active {
            background: var(--accent);
            color: #1a1a1a;
        }
        .breadcrumbs {
            background: #e8e3dc;
            padding: 8px 20px;
            font-size: 0.85rem;
            border-bottom: 1px solid var(--border);
        }
        .breadcrumbs ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            max-width: var(--max-width);
            margin: 0 auto;
        }
        .breadcrumbs li+li::before {
            content: "›";
            margin-right: 12px;
            color: #8a7e72;
        }
        .breadcrumbs a {
            color: var(--primary-light);
        }
        .breadcrumbs .current {
            color: var(--text-light);
            font-weight: 500;
        }
        main {
            padding: 40px 20px 60px;
        }
        .content-grid {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: 1fr 320px;
            gap: 40px;
        }
        @media(max-width:860px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
        }
        .article-body h1 {
            font-size: 2.4rem;
            line-height: 1.2;
            margin-bottom: 16px;
            color: var(--primary);
            font-weight: 800;
            letter-spacing: -0.02em;
        }
        .article-body h1 .emoji {
            font-style: normal;
        }
        .article-body .meta-line {
            color: var(--text-light);
            font-size: 0.9rem;
            margin-bottom: 24px;
            display: flex;
            flex-wrap: wrap;
            gap: 16px;
            align-items: center;
            border-bottom: 1px solid var(--border);
            padding-bottom: 16px;
        }
        .article-body .meta-line i {
            margin-right: 4px;
        }
        .article-body h2 {
            font-size: 1.7rem;
            margin: 40px 0 16px;
            color: var(--primary);
            font-weight: 700;
            border-left: 4px solid var(--accent);
            padding-left: 16px;
        }
        .article-body h3 {
            font-size: 1.3rem;
            margin: 28px 0 12px;
            color: var(--primary-light);
            font-weight: 600;
        }
        .article-body h4 {
            font-size: 1.05rem;
            margin: 20px 0 8px;
            color: var(--text);
            font-weight: 600;
        }
        .article-body p {
            margin-bottom: 16px;
            color: var(--text);
        }
        .article-body p b,
        .article-body p strong {
            color: var(--primary);
        }
        .article-body ul,
        .article-body ol {
            margin: 12px 0 20px 24px;
        }
        .article-body li {
            margin-bottom: 6px;
        }
        .article-body .feature-img {
            margin: 32px 0;
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        .article-body .feature-img img {
            width: 100%;
            border-radius: var(--radius);
        }
        .article-body .feature-img figcaption {
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: 8px;
            text-align: center;
            font-style: italic;
        }
        .article-body .quote-block {
            background: var(--card-bg);
            border-left: 4px solid var(--accent);
            padding: 20px 24px;
            margin: 24px 0;
            border-radius: 0 var(--radius) var(--radius) 0;
            box-shadow: var(--shadow);
            font-style: italic;
            color: var(--text-light);
        }
        .article-body .quote-block strong {
            color: var(--primary);
            font-style: normal;
        }
        .article-body .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 16px;
            margin: 24px 0;
        }
        .article-body .stat-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px 16px;
            text-align: center;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .article-body .stat-card .num {
            font-size: 2rem;
            font-weight: 800;
            color: var(--accent);
            display: block;
        }
        .article-body .stat-card .label {
            font-size: 0.85rem;
            color: var(--text-light);
            margin-top: 4px;
        }
        .article-body .internal-link {
            color: var(--accent-hover);
            font-weight: 500;
            border-bottom: 1px dotted var(--accent);
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .side-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 20px;
            box-shadow: var(--shadow);
            border: 1px solid var(--border);
        }
        .side-card h3 {
            font-size: 1.1rem;
            margin-bottom: 12px;
            color: var(--primary);
            border-bottom: 2px solid var(--accent);
            padding-bottom: 6px;
            display: inline-block;
        }
        .side-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .side-card ul li {
            padding: 6px 0;
            border-bottom: 1px solid #f0ece6;
        }
        .side-card ul li:last-child {
            border-bottom: none;
        }
        .side-card ul li a {
            font-size: 0.9rem;
            display: block;
            padding: 2px 0;
        }
        .side-card ul li a:hover {
            padding-left: 4px;
        }
        .search-box {
            display: flex;
            gap: 8px;
            margin-top: 6px;
        }
        .search-box input {
            flex: 1;
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 20px;
            font-size: 0.9rem;
            outline: none;
            background: var(--bg);
            transition: border 0.2s;
        }
        .search-box input:focus {
            border-color: var(--accent);
        }
        .search-box button {
            background: var(--primary-light);
            color: #fff;
            border: none;
            border-radius: 20px;
            padding: 10px 18px;
            cursor: pointer;
            font-size: 0.9rem;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .search-box button:hover {
            background: var(--primary);
        }
        .feedback-form {
            display: flex;
            flex-direction: column;
            gap: 10px;
            margin-top: 10px;
        }
        .feedback-form textarea {
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: var(--radius);
            font-family: var(--font);
            font-size: 0.9rem;
            resize: vertical;
            min-height: 70px;
            background: var(--bg);
            outline: none;
            transition: border 0.2s;
        }
        .feedback-form textarea:focus {
            border-color: var(--accent);
        }
        .feedback-form .row {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            align-items: center;
        }
        .feedback-form .star-rating {
            display: flex;
            gap: 2px;
            font-size: 1.3rem;
            color: #d6d0ca;
            cursor: pointer;
        }
        .feedback-form .star-rating i {
            transition: color 0.15s;
        }
        .feedback-form .star-rating i.active {
            color: #f5b342;
        }
        .feedback-form .star-rating i:hover,
        .feedback-form .star-rating i.hover {
            color: #f5b342;
        }
        .feedback-form button[type="submit"] {
            background: var(--accent);
            color: #1a1a1a;
            border: none;
            padding: 10px 24px;
            border-radius: 20px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            font-size: 0.9rem;
            align-self: flex-start;
        }
        .feedback-form button[type="submit"]:hover {
            background: var(--accent-hover);
        }
        .feedback-form .note {
            font-size: 0.8rem;
            color: var(--text-light);
        }
        .site-footer {
            background: var(--header-bg);
            color: #c4bdb5;
            padding: 40px 20px 24px;
            margin-top: 40px;
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 32px;
        }
        .footer-inner h4 {
            color: #e8e3dc;
            font-size: 1rem;
            margin-bottom: 12px;
            font-weight: 600;
        }
        .footer-inner a {
            color: #b0a89e;
            font-size: 0.9rem;
            display: block;
            padding: 3px 0;
        }
        .footer-inner a:hover {
            color: var(--accent);
            text-decoration: none;
        }
        .footer-inner friend-link {
            display: block;
        }
        .footer-inner friend-link a {
            display: inline;
            padding: 0 4px;
        }
        .footer-bottom {
            text-align: center;
            padding-top: 24px;
            margin-top: 24px;
            border-top: 1px solid rgba(255, 255, 255, 0.06);
            font-size: 0.85rem;
            color: #8a7e72;
            max-width: var(--max-width);
            margin-left: auto;
            margin-right: auto;
        }
        .footer-bottom .copyright {
            margin-top: 4px;
        }
        @media(max-width:700px) {
            .nav-toggle {
                display: inline-block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                padding-top: 12px;
                gap: 2px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 14px;
                border-radius: 6px;
            }
            .header-inner {
                align-items: center;
            }
            .article-body h1 {
                font-size: 1.8rem;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
            .article-body h3 {
                font-size: 1.15rem;
            }
            .breadcrumbs ol {
                font-size: 0.75rem;
                gap: 4px 8px;
            }
            .breadcrumbs li+li::before {
                margin-right: 8px;
            }
            .stat-grid {
                grid-template-columns: 1fr 1fr;
            }
            .sidebar {
                order: 2;
            }
        }
        @media(max-width:460px) {
            .stat-grid {
                grid-template-columns: 1fr;
            }
            .feedback-form .row {
                flex-direction: column;
                align-items: stretch;
            }
            .feedback-form .star-rating {
                justify-content: center;
            }
        }
        .article-body p:last-child {
            margin-bottom: 0;
        }
        .side-card .search-box input {
            background: #fff;
        }
        .last-updated {
            display: inline-block;
            background: #e8e3dc;
            padding: 2px 12px;
            border-radius: 20px;
            font-size: 0.8rem;
            color: var(--text-light);
        }
        .article-body .toc {
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 16px 20px;
            margin: 20px 0 28px;
            box-shadow: var(--shadow);
        }
        .article-body .toc summary {
            font-weight: 600;
            cursor: pointer;
            color: var(--primary);
        }
        .article-body .toc ol {
            margin: 10px 0 0 20px;
        }
        .article-body .toc ol li {
            padding: 2px 0;
        }
        .article-body .toc a {
            color: var(--primary-light);
        }