* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #1a2a3a;
            --secondary: #4a8bb9;
            --accent: #e8f0fe;
            --ice: #d4e9f7;
            --text: #1e2a36;
            --bg: #f5f7fa;
            --card: #ffffff;
            --radius: 12px;
            --shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            font-size: 16px;
        }
        a {
            color: var(--secondary);
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #1a5a7a;
            text-decoration: underline;
        }
        header {
            background: var(--primary);
            color: #fff;
            padding: 0 1.5rem;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            align-items: center;
            justify-content: space-between;
            height: 64px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 700;
            letter-spacing: -0.5px;
            color: #fff;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo i {
            color: var(--secondary);
            font-size: 1.6rem;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.92;
        }
        .my-logo span {
            background: linear-gradient(135deg, #fff, var(--ice));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 0.25rem;
        }
        nav {
            display: flex;
            gap: 1.8rem;
            align-items: center;
        }
        nav a {
            color: #dfe9f0;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.3rem 0;
            border-bottom: 2px solid transparent;
        }
        nav a:hover {
            color: #fff;
            border-bottom-color: var(--secondary);
            text-decoration: none;
        }
        .breadcrumb {
            background: #e8edf2;
            padding: 0.6rem 1.5rem;
            font-size: 0.85rem;
            border-bottom: 1px solid #d0d8e0;
        }
        .breadcrumb-inner {
            max-width: 1200px;
            margin: 0 auto;
        }
        .breadcrumb a {
            color: var(--secondary);
        }
        .breadcrumb span {
            color: #5a6a7a;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 2rem 1.5rem;
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
        }
        .content {
            min-width: 0;
        }
        .sidebar {
            position: sticky;
            top: 80px;
            align-self: start;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin-bottom: 0.6rem;
            color: var(--primary);
        }
        h1 i {
            color: var(--secondary);
            margin-right: 0.4rem;
        }
        .meta {
            color: #5a6a7a;
            font-size: 0.92rem;
            margin-bottom: 1.8rem;
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem;
            align-items: center;
        }
        .meta i {
            margin-right: 0.3rem;
        }
        .last-updated {
            background: var(--accent);
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            font-weight: 500;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin: 2.4rem 0 1rem 0;
            color: var(--primary);
            border-left: 5px solid var(--secondary);
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin: 1.8rem 0 0.8rem 0;
            color: #1e3a4a;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 1.2rem 0 0.5rem 0;
            color: #2a4a5a;
        }
        p {
            margin-bottom: 1rem;
        }
        .feature-img {
            width: 100%;
            border-radius: var(--radius);
            margin: 1.5rem 0;
            box-shadow: var(--shadow);
            border: 1px solid #e0e8f0;
        }
        .feature-img img {
            width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .feature-img .caption {
            padding: 0.6rem 1rem;
            background: var(--accent);
            font-size: 0.85rem;
            color: #3a5a6a;
            border-radius: 0 0 var(--radius) var(--radius);
        }
        .highlight-box {
            background: var(--accent);
            border-left: 4px solid var(--secondary);
            padding: 1.2rem 1.5rem;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 1.5rem 0;
        }
        .highlight-box i {
            color: var(--secondary);
            margin-right: 0.5rem;
        }
        ul,
        ol {
            margin: 0.8rem 0 1.2rem 1.8rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .sidebar-card {
            background: var(--card);
            border-radius: var(--radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            margin-bottom: 1.5rem;
        }
        .sidebar-card h3 {
            font-size: 1.1rem;
            margin-top: 0;
            margin-bottom: 0.8rem;
            border-bottom: 2px solid var(--ice);
            padding-bottom: 0.5rem;
        }
        .sidebar-card ul {
            list-style: none;
            margin: 0;
        }
        .sidebar-card li {
            margin-bottom: 0.6rem;
        }
        .sidebar-card li a {
            display: block;
            padding: 0.3rem 0;
            border-bottom: 1px solid #f0f4f8;
        }
        .sidebar-card li a:hover {
            padding-left: 0.4rem;
            text-decoration: none;
            color: #1a5a7a;
        }
        .search-form {
            display: flex;
            gap: 0.5rem;
            margin: 1rem 0;
        }
        .search-form input {
            flex: 1;
            padding: 0.6rem 1rem;
            border: 1px solid #ccd8e0;
            border-radius: 30px;
            font-size: 0.95rem;
            outline: none;
            transition: border 0.2s;
        }
        .search-form input:focus {
            border-color: var(--secondary);
        }
        .search-form button {
            background: var(--secondary);
            border: none;
            color: #fff;
            padding: 0.6rem 1.2rem;
            border-radius: 30px;
            cursor: pointer;
            font-size: 0.95rem;
            transition: background 0.2s;
        }
        .search-form button:hover {
            background: #1a5a7a;
        }
        .interact-box {
            background: var(--card);
            border-radius: var(--radius);
            padding: 1.5rem;
            box-shadow: var(--shadow);
            margin: 2rem 0;
        }
        .interact-box h3 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            font-size: 0.95rem;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.6rem 1rem;
            border: 1px solid #ccd8e0;
            border-radius: 8px;
            font-size: 0.95rem;
            font-family: inherit;
            outline: none;
            transition: border 0.2s;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: var(--secondary);
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .form-row {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }
        .btn-submit {
            background: var(--secondary);
            color: #fff;
            border: none;
            padding: 0.7rem 2rem;
            border-radius: 30px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .btn-submit:hover {
            background: #1a5a7a;
            transform: translateY(-1px);
        }
        .stars {
            display: flex;
            gap: 0.3rem;
            font-size: 1.8rem;
            color: #d0d8e0;
            cursor: pointer;
        }
        .stars i.active {
            color: #f5b342;
        }
        .stars i:hover {
            color: #f0a830;
        }
        friend-link {
            display: block;
            background: var(--primary);
            color: #dfe9f0;
            padding: 1.5rem 1.5rem;
            text-align: center;
            font-size: 0.9rem;
        }
        friend-link .fl-inner {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 1.2rem 2rem;
        }
        friend-link a {
            color: var(--ice);
        }
        friend-link a:hover {
            color: #fff;
        }
        footer {
            background: #0f1a24;
            color: #9aabba;
            padding: 2rem 1.5rem 1.5rem;
            text-align: center;
        }
        footer .f-inner {
            max-width: 1200px;
            margin: 0 auto;
        }
        footer p {
            margin-bottom: 0.3rem;
            font-size: 0.85rem;
        }
        footer a {
            color: var(--ice);
        }
        @media (max-width: 820px) {
            .container {
                grid-template-columns: 1fr;
                padding: 1.2rem 1rem;
            }
            .sidebar {
                position: static;
                order: 2;
            }
            .content {
                order: 1;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .header-inner {
                height: 56px;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            nav {
                display: none;
                flex-direction: column;
                background: var(--primary);
                position: absolute;
                top: 56px;
                left: 0;
                right: 0;
                padding: 1rem 1.5rem 1.5rem;
                gap: 0.8rem;
                box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
                border-top: 1px solid #2a4a5a;
            }
            nav.open {
                display: flex;
            }
            .nav-toggle {
                display: block;
            }
            .form-row {
                grid-template-columns: 1fr;
            }
            .breadcrumb {
                padding: 0.4rem 1rem;
                font-size: 0.78rem;
            }
            .meta {
                font-size: 0.82rem;
                gap: 0.6rem;
            }
        }
        @media (min-width: 821px) {
            nav {
                display: flex !important;
            }
        }
        html {
            scroll-behavior: smooth;
        }
        @media print {
            header,
            .sidebar,
            .interact-box,
            .search-form,
            friend-link,
            footer {
                display: none !important;
            }
            .container {
                display: block;
            }
            body {
                font-size: 12px;
            }
        }