*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #1a2a3a;
            --primary-light: #2c4058;
            --accent: #f39c12;
            --accent-hover: #e67e22;
            --gold: #f1c40f;
            --bg: #f5f2eb;
            --card-bg: #ffffff;
            --text: #1e1e1e;
            --text-light: #4a4a4a;
            --border: #d4cfc6;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            --radius: 18px;
            --radius-sm: 10px;
            --transition: 0.25s ease;
            --font: 'Segoe UI', system-ui, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
            --max-width: 1160px;
            --header-h: 72px;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--accent);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--accent-hover);
            text-decoration: underline;
        }
        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;
        }
        .site-header {
            background: var(--primary);
            color: #fff;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.15);
            height: var(--header-h);
            display: flex;
            align-items: center;
        }
        .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: 20px;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 8px;
            background: linear-gradient(135deg, var(--accent), var(--gold));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .my-logo i {
            -webkit-text-fill-color: var(--accent);
            font-size: 1.8rem;
        }
        .my-logo:hover {
            opacity: 0.9;
            text-decoration: none;
        }
        .nav-list {
            display: flex;
            list-style: none;
            gap: 8px;
            align-items: center;
        }
        .nav-list li a {
            color: rgba(255, 255, 255, 0.85);
            padding: 8px 14px;
            border-radius: 30px;
            font-size: 0.92rem;
            font-weight: 500;
            transition: var(--transition);
            white-space: nowrap;
        }
        .nav-list li a:hover,
        .nav-list li a.active {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 4px 6px;
            border-radius: 8px;
            transition: var(--transition);
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        #nav-toggle {
            display: none;
        }
        .breadcrumb-wrap {
            background: var(--card-bg);
            border-bottom: 1px solid var(--border);
            padding: 10px 0;
            font-size: 0.85rem;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 4px 8px;
            align-items: center;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 8px;
            color: var(--text-light);
            font-weight: 600;
        }
        .breadcrumb a {
            color: var(--text-light);
        }
        .breadcrumb a:hover {
            color: var(--accent);
        }
        .breadcrumb .current {
            color: var(--primary);
            font-weight: 600;
        }
        .main-wrap {
            padding: 40px 0 60px;
        }
        .article-header {
            margin-bottom: 36px;
        }
        .article-header h1 {
            font-size: 2.8rem;
            font-weight: 800;
            line-height: 1.2;
            color: var(--primary);
            letter-spacing: -0.03em;
            margin-bottom: 12px;
        }
        .article-header h1 i {
            color: var(--accent);
            margin-right: 10px;
        }
        .meta-line {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            color: var(--text-light);
            font-size: 0.92rem;
            align-items: center;
        }
        .meta-line .last-updated {
            background: var(--accent);
            color: #fff;
            padding: 2px 16px;
            border-radius: 30px;
            font-weight: 600;
            font-size: 0.82rem;
        }
        .meta-line i {
            margin-right: 6px;
        }
        .featured-image {
            margin: 28px 0 36px;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            background: var(--card-bg);
            padding: 8px;
        }
        .featured-image img {
            width: 100%;
            border-radius: calc(var(--radius) - 6px);
        }
        .featured-image figcaption {
            padding: 12px 16px 6px;
            font-size: 0.85rem;
            color: var(--text-light);
            font-style: italic;
        }
        h2 {
            font-size: 2rem;
            font-weight: 700;
            color: var(--primary);
            margin: 48px 0 18px;
            padding-bottom: 10px;
            border-bottom: 4px solid var(--accent);
            display: inline-block;
        }
        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--primary-light);
            margin: 32px 0 14px;
        }
        h4 {
            font-size: 1.2rem;
            font-weight: 600;
            color: var(--primary);
            margin: 24px 0 10px;
        }
        p {
            margin-bottom: 18px;
            color: var(--text);
        }
        .content-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px 32px;
            box-shadow: var(--shadow);
            margin-bottom: 28px;
        }
        .content-card.highlight {
            border-left: 6px solid var(--accent);
        }
        .content-card.insight {
            background: #fef9e7;
            border-left: 6px solid var(--gold);
        }
        .content-card code {
            background: #f0ede8;
            padding: 2px 10px;
            border-radius: 6px;
            font-size: 0.9rem;
        }
        .inline-link {
            font-weight: 600;
            color: var(--accent);
        }
        .inline-link:hover {
            color: var(--accent-hover);
        }
        ul,
        ol {
            margin: 0 0 20px 24px;
        }
        li {
            margin-bottom: 8px;
        }
        .emoji-big {
            font-size: 1.4rem;
            margin-right: 6px;
        }
        .stat-badge {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 2px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
        }
        .search-section {
            margin: 40px 0 20px;
        }
        .search-form {
            display: flex;
            gap: 12px;
            flex-wrap: wrap;
            max-width: 640px;
        }
        .search-form input[type="text"] {
            flex: 1;
            min-width: 200px;
            padding: 14px 20px;
            border: 2px solid var(--border);
            border-radius: 50px;
            font-size: 1rem;
            outline: none;
            transition: var(--transition);
            background: var(--card-bg);
        }
        .search-form input[type="text"]:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(243, 156, 18, 0.15);
        }
        .search-form button {
            background: var(--accent);
            color: #fff;
            border: none;
            padding: 14px 32px;
            border-radius: 50px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-form button:hover {
            background: var(--accent-hover);
            transform: scale(1.02);
        }
        .interact-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin: 40px 0 20px;
        }
        .interact-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 28px 30px;
            box-shadow: var(--shadow);
        }
        .interact-card h3 {
            margin-top: 0;
            border-bottom: 2px solid var(--border);
            padding-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interact-card textarea {
            width: 100%;
            padding: 14px 16px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            font-family: var(--font);
            resize: vertical;
            min-height: 100px;
            outline: none;
            transition: var(--transition);
            background: var(--bg);
        }
        .interact-card textarea:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(243, 156, 18, 0.1);
        }
        .interact-card input[type="text"],
        .interact-card input[type="number"] {
            width: 100%;
            padding: 12px 16px;
            border: 2px solid var(--border);
            border-radius: var(--radius-sm);
            font-size: 0.95rem;
            outline: none;
            transition: var(--transition);
            background: var(--bg);
        }
        .interact-card input:focus {
            border-color: var(--accent);
            box-shadow: 0 0 0 4px rgba(243, 156, 18, 0.1);
        }
        .interact-card .btn-submit {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: 50px;
            font-size: 0.95rem;
            font-weight: 600;
            cursor: pointer;
            transition: var(--transition);
            margin-top: 12px;
        }
        .interact-card .btn-submit:hover {
            background: var(--primary-light);
            transform: translateY(-2px);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            gap: 4px;
            justify-content: flex-end;
            margin: 10px 0 14px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: var(--gold);
        }
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.85);
            padding: 44px 0 32px;
            margin-top: 20px;
        }
        .footer-inner {
            max-width: var(--max-width);
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 36px;
        }
        .footer-inner h4 {
            color: #fff;
            margin-bottom: 14px;
            font-size: 1.1rem;
            border-bottom: 2px solid rgba(255, 255, 255, 0.15);
            padding-bottom: 8px;
        }
        .footer-inner a {
            color: rgba(255, 255, 255, 0.75);
        }
        .footer-inner a:hover {
            color: var(--accent);
        }
        .footer-inner ul {
            list-style: none;
            margin: 0;
            padding: 0;
        }
        .footer-inner ul li {
            margin-bottom: 8px;
        }
        friend-link {
            display: block;
            margin: 10px 0 0;
            font-size: 0.92rem;
        }
        friend-link a {
            display: inline-block;
            margin-right: 16px;
            margin-bottom: 6px;
            padding: 4px 0;
        }
        .copyright {
            text-align: center;
            padding-top: 28px;
            margin-top: 28px;
            border-top: 1px solid rgba(255, 255, 255, 0.1);
            font-size: 0.85rem;
            color: rgba(255, 255, 255, 0.5);
            grid-column: 1 / -1;
        }
        @media (max-width: 860px) {
            .nav-list {
                position: fixed;
                top: var(--header-h);
                left: 0;
                right: 0;
                background: var(--primary);
                flex-direction: column;
                padding: 20px 24px;
                gap: 4px;
                transform: translateY(-120%);
                opacity: 0;
                pointer-events: none;
                transition: var(--transition);
                box-shadow: 0 12px 30px rgba(0, 0, 0, 0.3);
                border-radius: 0 0 var(--radius) var(--radius);
                z-index: 999;
            }
            .nav-list li a {
                display: block;
                padding: 12px 16px;
                font-size: 1rem;
            }
            .hamburger {
                display: block;
            }
            #nav-toggle:checked~.nav-list {
                transform: translateY(0);
                opacity: 1;
                pointer-events: auto;
            }
            .article-header h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            .content-card {
                padding: 20px 18px;
            }
            .interact-grid {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .search-form button {
                padding: 12px 20px;
            }
            .meta-line {
                flex-direction: column;
                align-items: flex-start;
                gap: 6px;
            }
        }
        @media (max-width: 480px) {
            .article-header h1 {
                font-size: 1.6rem;
            }
            .my-logo {
                font-size: 1.3rem;
            }
            .header-inner {
                padding: 0 12px;
            }
            .container {
                padding: 0 14px;
            }
            .content-card {
                padding: 16px 14px;
            }
            .interact-card {
                padding: 18px 16px;
            }
            .star-rating label {
                font-size: 1.6rem;
            }
        }
        .schema-hidden {
            display: none;
        }
        .fade-up {
            opacity: 0;
            transform: translateY(20px);
            animation: fadeUp 0.6s ease forwards;
        }
        @keyframes fadeUp {
            to {
                opacity: 1;
                transform: translateY(0);
            }
        }
        .delay-1 {
            animation-delay: 0.1s;
        }
        .delay-2 {
            animation-delay: 0.2s;
        }
        .delay-3 {
            animation-delay: 0.3s;
        }
        .delay-4 {
            animation-delay: 0.4s;
        }