*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f7f9fc;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0;
            margin: 0;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: #d32f2f;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover,
        a:focus {
            color: #b71c1c;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            color: #0d1b2a;
            margin-top: 1.8rem;
            margin-bottom: 0.75rem;
        }
        h1 {
            font-size: 2.4rem;
            margin-top: 0.5rem;
        }
        h2 {
            font-size: 1.8rem;
            border-bottom: 3px solid #d32f2f;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.35rem;
        }
        h4 {
            font-size: 1.1rem;
        }
        p {
            margin-bottom: 1.2rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #0d1b2a 0%, #1b2838 100%);
            color: #fff;
            padding: 0 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 12px 20px;
            max-width: 1200px;
            margin: 0 auto;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 900;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #f9d423, #ff4e50);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: none;
            transition: transform 0.2s;
            display: inline-block;
        }
        .my-logo:hover {
            transform: scale(1.02);
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #f9d423;
            margin-right: 6px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 6px 10px;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.15);
        }
        .primary-nav {
            display: flex;
            gap: 8px;
            align-items: center;
            flex-wrap: wrap;
        }
        .primary-nav a {
            color: #e0e7ef;
            font-weight: 500;
            padding: 8px 16px;
            border-radius: 30px;
            transition: background 0.2s, color 0.2s;
            font-size: 0.95rem;
            white-space: nowrap;
        }
        .primary-nav a:hover,
        .primary-nav a.active {
            background: rgba(211, 47, 47, 0.7);
            color: #fff;
            text-decoration: none;
        }
        .breadcrumb-wrap {
            background: #e8edf3;
            padding: 10px 0;
            border-bottom: 1px solid #dce3ec;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0;
            margin: 0;
            font-size: 0.9rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            padding: 0 10px;
            color: #6b7a8f;
        }
        .breadcrumb a {
            color: #2c3e50;
        }
        .breadcrumb a:hover {
            color: #d32f2f;
        }
        .breadcrumb .current {
            color: #6b7a8f;
        }
        .page-wrapper {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 40px;
            padding: 40px 0;
        }
        .main-content {
            min-width: 0;
        }
        .sidebar {
            position: sticky;
            top: 100px;
            align-self: start;
        }
        .search-box {
            background: #fff;
            border-radius: 12px;
            padding: 24px 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            margin-bottom: 30px;
        }
        .search-box h3 {
            margin-top: 0;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-form {
            display: flex;
            gap: 10px;
            margin-top: 12px;
        }
        .search-form input[type="text"] {
            flex: 1;
            padding: 12px 18px;
            border: 2px solid #dce3ec;
            border-radius: 30px;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.2s;
        }
        .search-form input[type="text"]:focus {
            border-color: #d32f2f;
        }
        .search-form button {
            background: #d32f2f;
            color: #fff;
            border: none;
            padding: 12px 24px;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            font-size: 1rem;
        }
        .search-form button:hover {
            background: #b71c1c;
            transform: scale(1.02);
        }
        .user-feedback {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 20px;
            margin: 40px 0;
        }
        .feedback-card {
            background: #fff;
            border-radius: 16px;
            padding: 24px 22px;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.06);
        }
        .feedback-card h3 {
            margin-top: 0;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 12px;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 12px 16px;
            border: 2px solid #dce3ec;
            border-radius: 10px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.2s;
            font-family: inherit;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #d32f2f;
        }
        .feedback-card textarea {
            min-height: 90px;
            resize: vertical;
        }
        .feedback-card button {
            background: #0d1b2a;
            color: #fff;
            border: none;
            padding: 12px 20px;
            border-radius: 30px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            font-size: 1rem;
        }
        .feedback-card button:hover {
            background: #1b2838;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            gap: 6px;
            font-size: 1.6rem;
            color: #f9d423;
            cursor: pointer;
        }
        .star-rating i {
            transition: transform 0.15s;
        }
        .star-rating i:hover {
            transform: scale(1.2);
        }
        .code-table {
            width: 100%;
            border-collapse: collapse;
            background: #fff;
            border-radius: 12px;
            overflow: hidden;
            box-shadow: 0 2px 16px rgba(0, 0, 0, 0.05);
            margin: 20px 0 30px;
        }
        .code-table th {
            background: #0d1b2a;
            color: #fff;
            padding: 14px 18px;
            text-align: left;
            font-weight: 600;
        }
        .code-table td {
            padding: 14px 18px;
            border-bottom: 1px solid #eef2f7;
        }
        .code-table tr:last-child td {
            border-bottom: none;
        }
        .code-table tr:hover td {
            background: #f4f7fc;
        }
        .badge-active {
            background: #2e7d32;
            color: #fff;
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            display: inline-block;
        }
        .badge-expired {
            background: #9e9e9e;
            color: #fff;
            padding: 4px 14px;
            border-radius: 30px;
            font-size: 0.8rem;
            font-weight: 600;
            display: inline-block;
        }
        .code-value {
            font-family: 'Courier New', monospace;
            font-weight: 700;
            background: #f0f4fa;
            padding: 3px 12px;
            border-radius: 6px;
            letter-spacing: 0.5px;
        }
        .featured-image {
            border-radius: 16px;
            overflow: hidden;
            margin: 30px 0;
            box-shadow: 0 6px 30px rgba(0, 0, 0, 0.1);
        }
        .featured-image img {
            width: 100%;
            height: auto;
            display: block;
        }
        .featured-image figcaption {
            background: #fff;
            padding: 12px 20px;
            font-size: 0.9rem;
            color: #4a5a6e;
            border-top: 1px solid #eef2f7;
        }
        .sidebar-card {
            background: #fff;
            border-radius: 16px;
            padding: 22px 20px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.06);
            margin-bottom: 24px;
        }
        .sidebar-card h4 {
            margin-top: 0;
            font-size: 1.15rem;
            border-left: 4px solid #d32f2f;
            padding-left: 12px;
        }
        .sidebar-links {
            list-style: none;
            padding: 0;
            margin: 12px 0 0;
        }
        .sidebar-links li {
            margin-bottom: 10px;
        }
        .sidebar-links a {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 8px 12px;
            border-radius: 8px;
            transition: background 0.15s;
            font-weight: 500;
            color: #1e2a3a;
        }
        .sidebar-links a:hover {
            background: #f0f4fa;
            text-decoration: none;
            color: #d32f2f;
        }
        .sidebar-links i {
            width: 20px;
            color: #d32f2f;
        }
        .site-footer {
            background: #0d1b2a;
            color: #c8d4e3;
            padding: 40px 0 20px;
            margin-top: 50px;
            border-top: 4px solid #d32f2f;
        }
        .footer-inner {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 30px;
        }
        .footer-inner h4 {
            color: #fff;
            margin-top: 0;
            font-size: 1.1rem;
        }
        .footer-inner a {
            color: #c8d4e3;
        }
        .footer-inner a:hover {
            color: #f9d423;
        }
        .footer-links {
            list-style: none;
            padding: 0;
        }
        .footer-links li {
            margin-bottom: 8px;
        }
        .copyright {
            grid-column: 1 / -1;
            border-top: 1px solid #2a3a4e;
            padding-top: 20px;
            margin-top: 20px;
            text-align: center;
            font-size: 0.9rem;
            color: #8a9aa8;
        }
        friend-link {
            display: block;
            margin-top: 10px;
            font-size: 0.95rem;
        }
        friend-link a {
            color: #f9d423;
        }
        @media (max-width: 1024px) {
            .page-wrapper {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .primary-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #0d1b2a;
                padding: 16px 12px;
                border-radius: 0 0 16px 16px;
                gap: 4px;
                position: absolute;
                top: 100%;
                left: 0;
                box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
            }
            .primary-nav.open {
                display: flex;
            }
            .primary-nav a {
                padding: 12px 18px;
                border-radius: 8px;
            }
            .header-inner {
                flex-wrap: wrap;
                position: relative;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .user-feedback {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 20px;
            }
            .search-form {
                flex-direction: column;
            }
            .search-form button {
                width: 100%;
            }
            .code-table {
                font-size: 0.85rem;
            }
            .code-table th,
            .code-table td {
                padding: 10px 12px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 12px;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            h1 {
                font-size: 1.5rem;
            }
            .breadcrumb {
                font-size: 0.8rem;
            }
        }
        .last-updated {
            display: inline-block;
            background: #e8edf3;
            padding: 6px 18px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #3d4f63;
            margin-bottom: 20px;
        }
        .highlight-box {
            background: #fff8e1;
            border-left: 5px solid #f9d423;
            padding: 18px 22px;
            border-radius: 8px;
            margin: 20px 0;
        }
        .tip-box {
            background: #e3f2fd;
            border-left: 5px solid #1e88e5;
            padding: 18px 22px;
            border-radius: 8px;
            margin: 20px 0;
        }
        .btn {
            display: inline-block;
            background: #d32f2f;
            color: #fff;
            padding: 10px 28px;
            border-radius: 30px;
            font-weight: 600;
            transition: background 0.2s, transform 0.1s;
            border: none;
            cursor: pointer;
        }
        .btn:hover {
            background: #b71c1c;
            transform: scale(1.02);
            text-decoration: none;
            color: #fff;
        }
        .section-spacer {
            height: 10px;
        }