*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
            background: #f4f7fb;
            color: #1a1a2e;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        a {
            color: #0056b3;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #ff6b35;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.2;
            margin-top: 1.8rem;
            margin-bottom: 0.8rem;
            color: #0f0f2e;
        }
        h1 {
            font-size: 2.4rem;
            border-bottom: 4px solid #ff6b35;
            padding-bottom: 0.5rem;
        }
        h2 {
            font-size: 1.8rem;
            border-left: 5px solid #ff6b35;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.4rem;
            color: #1e3a5f;
        }
        h4 {
            font-size: 1.15rem;
            color: #2c3e50;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.2rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        header {
            background: linear-gradient(135deg, #0b1a2e 0%, #1a3a4a 100%);
            color: #fff;
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.25);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 0.8rem;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            background: linear-gradient(45deg, #f7971e, #ffd200);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            letter-spacing: -0.5px;
            text-shadow: 0 2px 8px rgba(255, 107, 53, 0.3);
            transition: transform 0.2s ease;
            display: inline-block;
        }
        .my-logo:hover {
            transform: scale(1.02);
        }
        .my-logo a {
            color: inherit;
            text-decoration: none;
            -webkit-text-fill-color: transparent;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        nav {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
            align-items: center;
        }
        nav a {
            color: #e0e8f0;
            padding: 0.5rem 1rem;
            border-radius: 30px;
            font-weight: 500;
            font-size: 0.95rem;
            transition: all 0.25s ease;
            white-space: nowrap;
        }
        nav a:hover {
            background: #ff6b35;
            color: #fff;
            text-decoration: none;
            transform: translateY(-2px);
        }
        .breadcrumb {
            background: #e8edf3;
            padding: 0.7rem 0;
            font-size: 0.9rem;
            border-bottom: 1px solid #d0d8e0;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #888;
        }
        .breadcrumb a {
            color: #0056b3;
        }
        .breadcrumb .current {
            color: #555;
            font-weight: 600;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2.5rem 0;
        }
        @media (max-width: 992px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
        }
        .sidebar {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.8rem 1.5rem;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            border: 1px solid #eef2f7;
            height: fit-content;
            position: sticky;
            top: 90px;
        }
        .sidebar h3 {
            margin-top: 0;
            font-size: 1.3rem;
            border-bottom: 2px solid #ff6b35;
            padding-bottom: 0.5rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            padding: 0.5rem 0;
            border-bottom: 1px dashed #e0e6ee;
        }
        .sidebar li a {
            font-weight: 500;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .sidebar li a::before {
            content: "⚽";
            font-size: 1rem;
        }
        .code-box {
            background: linear-gradient(145deg, #0f2027, #203a43);
            color: #f0f9ff;
            padding: 1.2rem 1.8rem;
            border-radius: 12px;
            font-family: 'Courier New', monospace;
            font-size: 1.1rem;
            margin: 1.5rem 0;
            display: inline-block;
            border-left: 6px solid #ffd700;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
            letter-spacing: 1px;
            user-select: all;
            transition: transform 0.2s;
        }
        .code-box:hover {
            transform: scale(1.01);
        }
        .btn {
            display: inline-block;
            padding: 0.7rem 2rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            border: none;
            cursor: pointer;
            transition: all 0.25s ease;
            background: #ff6b35;
            color: #fff;
            box-shadow: 0 4px 14px rgba(255, 107, 53, 0.35);
        }
        .btn:hover {
            background: #e55a2b;
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(255, 107, 53, 0.45);
            text-decoration: none;
            color: #fff;
        }
        .btn-secondary {
            background: #1e3a5f;
            box-shadow: 0 4px 14px rgba(30, 58, 95, 0.3);
        }
        .btn-secondary:hover {
            background: #142c47;
        }
        .search-form {
            display: flex;
            gap: 0.6rem;
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        .search-form input[type="text"] {
            flex: 1;
            min-width: 180px;
            padding: 0.8rem 1.2rem;
            border-radius: 40px;
            border: 2px solid #d0d8e0;
            font-size: 1rem;
            transition: border 0.2s;
            outline: none;
            background: #fff;
        }
        .search-form input[type="text"]:focus {
            border-color: #ff6b35;
        }
        .search-form button {
            padding: 0.8rem 1.8rem;
            border-radius: 40px;
            border: none;
            background: #ff6b35;
            color: #fff;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-form button:hover {
            background: #e55a2b;
        }
        .feedback-section {
            background: #ffffff;
            border-radius: 16px;
            padding: 2rem 2rem 2.5rem;
            margin: 2.5rem 0;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
            border: 1px solid #eef2f7;
        }
        .feedback-section h2 {
            margin-top: 0;
        }
        .form-group {
            margin-bottom: 1.2rem;
        }
        .form-group label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            color: #1a2a3a;
        }
        .form-group input,
        .form-group textarea,
        .form-group select {
            width: 100%;
            padding: 0.75rem 1rem;
            border-radius: 10px;
            border: 2px solid #dce3ec;
            font-size: 1rem;
            transition: border 0.2s;
            font-family: inherit;
            background: #fafcff;
        }
        .form-group input:focus,
        .form-group textarea:focus,
        .form-group select:focus {
            border-color: #ff6b35;
            outline: none;
        }
        .form-group textarea {
            min-height: 100px;
            resize: vertical;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ccc;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f5b342;
        }
        .featured-image {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.1);
            background: #eef2f7;
        }
        .featured-image img {
            width: 100%;
            height: auto;
            aspect-ratio: 16/9;
            object-fit: cover;
        }
        .featured-image figcaption {
            padding: 1rem 1.5rem;
            background: #f8fafc;
            font-size: 0.9rem;
            color: #555;
            border-top: 1px solid #e0e6ee;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.8rem 0;
            border-radius: 12px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.04);
        }
        table {
            width: 100%;
            border-collapse: collapse;
            background: #fff;
            font-size: 0.95rem;
        }
        th,
        td {
            padding: 0.9rem 1.2rem;
            text-align: left;
            border-bottom: 1px solid #e8edf4;
        }
        th {
            background: #1e3a5f;
            color: #fff;
            font-weight: 600;
            white-space: nowrap;
        }
        tr:hover td {
            background: #f6f9ff;
        }
        footer {
            background: #0b1a2e;
            color: #c8d6e5;
            padding: 2.5rem 0 1.8rem;
            margin-top: 3rem;
            border-top: 4px solid #ff6b35;
        }
        footer .container {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            footer .container {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        footer h4 {
            color: #ffd700;
            margin-top: 0;
            font-size: 1.1rem;
        }
        footer a {
            color: #b0c8e0;
        }
        footer a:hover {
            color: #ffd700;
        }
        .copyright {
            grid-column: 1 / -1;
            text-align: center;
            padding-top: 1.5rem;
            border-top: 1px solid rgba(255, 255, 255, 0.08);
            font-size: 0.9rem;
            color: #8899aa;
        }
        friend-link {
            display: block;
            background: rgba(255, 255, 255, 0.03);
            padding: 0.8rem 1.2rem;
            border-radius: 8px;
            border: 1px solid rgba(255, 255, 255, 0.06);
            margin-top: 0.5rem;
        }
        friend-link a {
            display: inline-block;
            margin-right: 1.2rem;
            margin-bottom: 0.3rem;
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            nav {
                display: none;
                width: 100%;
                flex-direction: column;
                background: #0f1e30;
                padding: 1rem 0.5rem;
                border-radius: 12px;
                margin-top: 0.5rem;
                gap: 0.3rem;
            }
            nav.open {
                display: flex;
            }
            nav a {
                padding: 0.7rem 1.2rem;
                border-radius: 8px;
                width: 100%;
            }
            .header-inner {
                position: relative;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.8rem;
            }
            .feedback-section {
                padding: 1.2rem;
            }
            .code-box {
                font-size: 0.9rem;
                padding: 0.8rem 1.2rem;
                word-break: break-all;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
                justify-content: center;
            }
        }
        .highlight {
            background: linear-gradient(120deg, #fff3cd 0%, #fff3cd 40%, #ffe8a0 100%);
            padding: 0.1rem 0.4rem;
            border-radius: 4px;
            font-weight: 600;
        }
        .tag {
            display: inline-block;
            background: #e8edf4;
            padding: 0.2rem 0.8rem;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            color: #2c3e50;
        }
        .tag.active {
            background: #28a745;
            color: #fff;
        }
        .tag.expired {
            background: #dc3545;
            color: #fff;
        }
        .emoji-big {
            font-size: 1.8rem;
            display: inline-block;
            margin-right: 0.3rem;
        }
        .last-updated {
            display: inline-block;
            background: #e8edf3;
            padding: 0.3rem 1rem;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #555;
            margin-bottom: 0.8rem;
        }
        .pro-tip {
            background: #e8f4fd;
            border-left: 5px solid #17a2b8;
            padding: 1.2rem 1.8rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .pro-tip strong {
            color: #0b5e7c;
        }
        .card-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 1.5rem;
            margin: 1.8rem 0;
        }
        .card {
            background: #fff;
            border-radius: 14px;
            padding: 1.5rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.05);
            border: 1px solid #eef2f7;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
        }
        .card h4 {
            margin-top: 0;
        }
        .section-divider {
            height: 2px;
            background: linear-gradient(90deg, transparent, #ff6b35, transparent);
            margin: 2.8rem 0;
            border: none;
        }
        .toc {
            background: #f8fafc;
            border: 1px solid #e0e6ee;
            border-radius: 12px;
            padding: 1.5rem 2rem;
            margin: 1.8rem 0;
        }
        .toc h3 {
            margin-top: 0;
        }
        .toc ol {
            columns: 2;
            column-gap: 2rem;
        }
        .toc li {
            margin-bottom: 0.4rem;
        }
        @media (max-width: 600px) {
            .toc ol {
                columns: 1;
            }
        }