* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background: #f4f7fb;
            color: #2c3e50;
            line-height: 1.75;
        }
        a {
            color: #2563eb;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #1d4ed8;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 16px;
        }
        header {
            background: linear-gradient(135deg, #1e293b, #334155);
            padding: 0;
            position: sticky;
            top: 0;
            z-index: 100;
        }
        .header-top {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 14px 16px;
            max-width: 1300px;
            margin: 0 auto;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 900;
            letter-spacing: -1px;
            color: #f59e0b;
            display: flex;
            align-items: center;
            gap: 8px;
            text-decoration: none;
        }
        .my-logo i {
            font-size: 2rem;
            color: #60a5fa;
        }
        .my-logo:hover {
            text-decoration: none;
            color: #fbbf24;
        }
        #nav-menu {
            display: flex;
            align-items: center;
            gap: 18px;
            list-style: none;
            flex-wrap: wrap;
        }
        #nav-menu a {
            color: #e2e8f0;
            padding: 6px 14px;
            border-radius: 8px;
            font-size: 0.9rem;
            font-weight: 600;
            transition: background 0.2s;
        }
        #nav-menu a:hover {
            background: rgba(255, 255, 255, 0.15);
            color: #fbbf24;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: transparent;
            border: none;
            cursor: pointer;
            font-size: 1.6rem;
            color: #fff;
        }
        .breadcrumb {
            background: #eef2f7;
            padding: 10px 0;
            font-size: 0.85rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px;
        }
        .breadcrumb li+li::before {
            content: "/";
            margin: 0 6px;
            color: #94a3b8;
        }
        .hero {
            background: radial-gradient(circle at 20% 30%, #1e3a5f, #0f172a);
            color: #fff;
            padding: 60px 20px;
            text-align: center;
        }
        .hero h1 {
            font-size: 2.6rem;
            line-height: 1.2;
            margin-bottom: 14px;
            color: #fff;
        }
        .hero p {
            font-size: 1.15rem;
            color: #cbd5e1;
            max-width: 800px;
            margin: 0 auto 20px;
        }
        .hero .badge {
            display: inline-block;
            background: #f59e0b;
            color: #0f172a;
            padding: 6px 20px;
            border-radius: 30px;
            font-weight: 700;
            font-size: 0.85rem;
        }
        .search-bar {
            display: flex;
            justify-content: center;
            margin: 30px auto 10px;
            max-width: 520px;
        }
        .search-bar input {
            flex: 1;
            padding: 12px 18px;
            border: 2px solid #64748b;
            border-radius: 40px 0 0 40px;
            font-size: 1rem;
            background: #fff;
            outline: none;
            min-width: 0;
        }
        .search-bar button {
            padding: 0 20px;
            background: #f59e0b;
            border: none;
            border-radius: 0 40px 40px 0;
            font-size: 1.1rem;
            cursor: pointer;
            color: #0f172a;
            border: 2px solid #f59e0b;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 24px;
            padding: 40px 0;
        }
        @media (min-width: 768px) {
            .content-grid {
                grid-template-columns: 2fr 1fr;
            }
        }
        .main-content {
            background: #fff;
            border-radius: 20px;
            padding: 32px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
        }
        .sidebar {
            background: #fff;
            border-radius: 20px;
            padding: 24px;
            box-shadow: 0 8px 25px rgba(0, 0, 0, 0.05);
            height: fit-content;
            position: sticky;
            top: 70px;
        }
        h2 {
            font-size: 1.9rem;
            margin-top: 36px;
            margin-bottom: 16px;
            padding-bottom: 8px;
            border-bottom: 3px solid #f59e0b;
            color: #1e293b;
        }
        h3 {
            font-size: 1.4rem;
            margin-top: 28px;
            margin-bottom: 12px;
            color: #334155;
        }
        h4 {
            font-size: 1.1rem;
            margin-top: 20px;
            margin-bottom: 8px;
            color: #475569;
        }
        p {
            margin-bottom: 16px;
        }
        ul.tips {
            margin: 16px 0 20px 20px;
        }
        ul.tips li {
            margin-bottom: 10px;
        }
        .highlight-box {
            background: #fef9e7;
            border-left: 5px solid #f59e0b;
            padding: 18px 20px;
            border-radius: 8px;
            margin: 24px 0;
        }
        .info-box {
            background: #eef2ff;
            border-left: 5px solid #6366f1;
            padding: 16px 18px;
            border-radius: 8px;
            margin: 20px 0;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        th,
        td {
            padding: 10px 14px;
            border: 1px solid #e2e8f0;
            text-align: left;
        }
        th {
            background: #1e293b;
            color: #fff;
        }
        tr:nth-child(even) {
            background: #f8fafc;
        }
        .faq-item {
            margin: 16px 0;
        }
        .faq-item summary {
            font-weight: 600;
            cursor: pointer;
            color: #1e293b;
            padding: 10px;
            background: #f1f5f9;
            border-radius: 8px;
        }
        .faq-item p {
            padding: 12px 10px 4px;
        }
        .comment-form,
        .rating-form {
            background: #f8fafc;
            padding: 20px;
            border-radius: 16px;
            margin: 24px 0;
        }
        .comment-form textarea,
        .comment-form input,
        .rating-form input,
        .rating-form select {
            width: 100%;
            padding: 12px;
            margin-bottom: 14px;
            border: 1px solid #cbd5e1;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
        }
        .btn {
            background: #2563eb;
            color: #fff;
            border: none;
            padding: 12px 28px;
            border-radius: 50px;
            font-size: 1rem;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.2s;
        }
        .btn:hover {
            background: #1d4ed8;
        }
        .rating-stars {
            color: #f59e0b;
            font-size: 1.4rem;
            margin-bottom: 10px;
        }
        .post-image {
            border-radius: 16px;
            overflow: hidden;
            margin: 30px 0;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.08);
        }
        .post-image img {
            width: 100%;
        }
        .post-image figcaption {
            background: #f1f5f9;
            padding: 10px 14px;
            font-size: 0.88rem;
            text-align: center;
            color: #64748b;
        }
        .friend-link {
            display: block;
            background: #f1f5f9;
            margin: 20px 0;
            padding: 20px 24px;
            border-radius: 16px;
        }
        .friend-link a {
            margin-right: 16px;
        }
        footer {
            background: #0f172a;
            color: #94a3b8;
            padding: 40px 0 20px;
            margin-top: 40px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }
        @media (min-width: 768px) {
            .footer-grid {
                grid-template-columns: repeat(3, 1fr);
            }
        }
        .footer-col h3 {
            color: #f8fafc;
            font-size: 1.1rem;
            margin-bottom: 14px;
        }
        .footer-col a {
            color: #94a3b8;
            display: block;
            margin-bottom: 6px;
        }
        .footer-col a:hover {
            color: #fbbf24;
        }
        .copyright {
            text-align: center;
            padding-top: 20px;
            border-top: 1px solid #1e293b;
            font-size: 0.85rem;
        }
        .back-to-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #f59e0b;
            color: #0f172a;
            border: none;
            border-radius: 50%;
            width: 48px;
            height: 48px;
            font-size: 1.2rem;
            cursor: pointer;
            z-index: 999;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            #nav-menu {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 10px 0;
            }
            #nav-menu.open {
                display: flex;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .main-content {
                padding: 20px 16px;
            }
            .sidebar {
                position: static;
                margin-top: 20px;
            }
            .search-bar {
                flex-direction: column;
            }
            .search-bar input {
                border-radius: 40px;
                margin-bottom: 8px;
            }
            .search-bar button {
                border-radius: 40px;
                padding: 12px;
            }
        }
        .toc {
            background: #f8fafc;
            padding: 16px 20px;
            border-radius: 12px;
            margin: 20px 0;
        }
        .toc a {
            display: block;
            padding: 3px 0;
            font-size: 0.92rem;
        }