*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #f5f7fa;
            color: #1a1a2e;
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
            -moz-osx-font-smoothing: grayscale;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #004080;
            text-decoration: underline;
        }
        ul,
        ol {
            padding-left: 1.5rem;
            margin-bottom: 1rem;
        }
        li {
            margin-bottom: 0.35rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.3;
            font-weight: 700;
            color: #0d1b2a;
            margin-top: 0;
        }
        h1 {
            font-size: 2.2rem;
            margin-bottom: 1.2rem;
        }
        h2 {
            font-size: 1.65rem;
            margin-top: 2.5rem;
            margin-bottom: 1rem;
            border-bottom: 2px solid #e0e6ed;
            padding-bottom: 0.5rem;
        }
        h3 {
            font-size: 1.3rem;
            margin-top: 1.8rem;
            margin-bottom: 0.7rem;
        }
        h4 {
            font-size: 1.1rem;
            margin-top: 1.4rem;
            margin-bottom: 0.5rem;
        }
        p {
            margin-bottom: 1.1rem;
        }
        strong {
            font-weight: 700;
            color: #0b1c2f;
        }
        .container {
            max-width: 1120px;
            margin: 0 auto;
            padding: 0 1.25rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0a1628 0%, #1a2a4a 100%);
            color: #fff;
            padding: 0.75rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 20px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #f0c75e;
            text-decoration: none;
            letter-spacing: -0.5px;
            transition: opacity 0.2s;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none;
            color: #f0c75e;
        }
        .my-logo i {
            font-size: 1.6rem;
            color: #ffd700;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .main-nav {
            display: flex;
            gap: 0.3rem;
            flex-wrap: wrap;
        }
        .main-nav a {
            color: #e0e8f0;
            padding: 0.45rem 1rem;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background 0.25s, color 0.25s;
            text-decoration: none;
        }
        .main-nav a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #ffd700;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 0.35rem;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 0.25rem 0.5rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .hamburger:focus-visible {
            outline: 2px solid #ffd700;
            outline-offset: 2px;
        }
        .breadcrumbs {
            background: #eef2f7;
            padding: 0.6rem 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #dce3ec;
        }
        .breadcrumbs ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
            padding: 0;
            margin: 0;
        }
        .breadcrumbs li {
            margin: 0;
        }
        .breadcrumbs li+li::before {
            content: "›";
            margin-right: 0.5rem;
            color: #6b7a8f;
        }
        .breadcrumbs a {
            color: #2c5282;
        }
        .breadcrumbs .current {
            color: #4a5568;
            font-weight: 600;
        }
        .main-grid {
            display: grid;
            grid-template-columns: 1fr 280px;
            gap: 2rem;
            padding: 2rem 0;
        }
        .content-area {
            min-width: 0;
        }
        .sidebar {
            position: sticky;
            top: 90px;
            align-self: start;
        }
        .sidebar-widget {
            background: #fff;
            border-radius: 14px;
            padding: 1.25rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 1px 8px rgba(0, 0, 0, 0.06);
            border: 1px solid #e8edf4;
        }
        .sidebar-widget h3 {
            font-size: 1.1rem;
            margin-top: 0;
            margin-bottom: 0.8rem;
            border-bottom: 1px solid #e2e8f0;
            padding-bottom: 0.5rem;
            color: #0d1b2a;
        }
        .sidebar-link-list {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-link-list li {
            margin-bottom: 0.45rem;
        }
        .sidebar-link-list a {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.4rem 0;
            color: #2d3748;
            font-size: 0.92rem;
            border-bottom: 1px dashed #edf2f7;
            transition: color 0.2s, padding-left 0.2s;
        }
        .sidebar-link-list a:hover {
            color: #0066cc;
            padding-left: 0.3rem;
            text-decoration: none;
        }
        .sidebar-link-list a i {
            color: #c0a86a;
            font-size: 0.75rem;
        }
        .featured-image-wrap {
            margin: 1.5rem 0 2rem;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.08);
            background: #fff;
        }
        .featured-image-wrap img {
            width: 100%;
            height: auto;
            aspect-ratio: 16/9;
            object-fit: cover;
        }
        .image-caption {
            padding: 0.6rem 1rem;
            font-size: 0.85rem;
            color: #4a5568;
            background: #f9fafc;
            border-top: 1px solid #eef2f7;
        }
        .search-section {
            background: #fff;
            border-radius: 16px;
            padding: 1.5rem;
            margin: 2rem 0;
            box-shadow: 0 1px 12px rgba(0, 0, 0, 0.05);
            border: 1px solid #e8edf4;
        }
        .search-form {
            display: flex;
            gap: 0.6rem;
            flex-wrap: wrap;
        }
        .search-form input[type="text"] {
            flex: 1;
            min-width: 180px;
            padding: 0.75rem 1.2rem;
            border: 1px solid #d1d9e6;
            border-radius: 40px;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.25s, box-shadow 0.25s;
            background: #f8fafc;
        }
        .search-form input[type="text"]:focus {
            border-color: #1a2a4a;
            box-shadow: 0 0 0 3px rgba(26, 42, 74, 0.1);
        }
        .search-form button {
            padding: 0.7rem 1.8rem;
            background: linear-gradient(135deg, #1a2a4a, #0d1b2a);
            color: #fff;
            border: none;
            border-radius: 40px;
            font-size: 0.95rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-form button:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.15);
        }
        .search-form button:active {
            transform: translateY(0);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .feedback-card {
            background: #fff;
            border-radius: 16px;
            padding: 1.5rem;
            box-shadow: 0 1px 12px rgba(0, 0, 0, 0.05);
            border: 1px solid #e8edf4;
        }
        .feedback-card h3 {
            margin-top: 0;
            margin-bottom: 1rem;
            font-size: 1.15rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .feedback-card h3 i {
            color: #f0c75e;
        }
        .feedback-form label {
            display: block;
            font-weight: 600;
            margin-bottom: 0.3rem;
            font-size: 0.9rem;
            color: #2d3748;
        }
        .feedback-form textarea,
        .feedback-form input:not([type="submit"]) {
            width: 100%;
            padding: 0.7rem 1rem;
            border: 1px solid #d1d9e6;
            border-radius: 10px;
            font-size: 0.9rem;
            margin-bottom: 0.8rem;
            font-family: inherit;
            background: #f8fafc;
            transition: border-color 0.25s;
        }
        .feedback-form textarea:focus,
        .feedback-form input:focus {
            border-color: #1a2a4a;
            outline: none;
            box-shadow: 0 0 0 3px rgba(26, 42, 74, 0.08);
        }
        .feedback-form textarea {
            min-height: 100px;
            resize: vertical;
        }
        .feedback-form .submit-btn {
            padding: 0.7rem 2rem;
            background: linear-gradient(135deg, #1a2a4a, #0d1b2a);
            color: #fff;
            border: none;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        .feedback-form .submit-btn:hover {
            transform: translateY(-1px);
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.12);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            margin-bottom: 0.8rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.7rem;
            color: #d1d9e6;
            cursor: pointer;
            transition: color 0.2s, transform 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f0c75e;
        }
        .star-rating input:checked~label {
            color: #f0c75e;
        }
        .star-rating label:hover {
            transform: scale(1.12);
        }
        friend-link {
            display: block;
            padding: 0.8rem 0;
            border-bottom: 1px dashed #e2e8f0;
        }
        friend-link:last-child {
            border-bottom: none;
        }
        friend-link a {
            font-weight: 500;
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
        }
        friend-link a i {
            color: #c0a86a;
            font-size: 0.75rem;
        }
        .site-footer {
            background: linear-gradient(135deg, #0a1628 0%, #1a2a4a 100%);
            color: #c8d4e6;
            padding: 2.5rem 0 1.2rem;
            margin-top: 3rem;
        }
        .footer-inner {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        .footer-inner h4 {
            color: #f0c75e;
            font-size: 1.1rem;
            margin-bottom: 0.8rem;
            border-bottom: 1px solid rgba(255, 255, 255, 0.08);
            padding-bottom: 0.4rem;
        }
        .footer-inner p,
        .footer-inner a {
            color: #b0c4de;
            font-size: 0.9rem;
        }
        .footer-inner a:hover {
            color: #ffd700;
        }
        .footer-bottom {
            border-top: 1px solid rgba(255, 255, 255, 0.07);
            padding-top: 1.2rem;
            margin-top: 1.8rem;
            text-align: center;
            font-size: 0.82rem;
            color: #8899b0;
        }
        .footer-bottom a {
            color: #b0c4de;
        }
        .footer-bottom a:hover {
            color: #ffd700;
        }
        .toc {
            background: #fff;
            border-radius: 14px;
            padding: 1.2rem 1.5rem;
            margin: 1.8rem 0;
            border: 1px solid #e8edf4;
            box-shadow: 0 1px 6px rgba(0, 0, 0, 0.04);
        }
        .toc summary {
            cursor: pointer;
            font-weight: 700;
            font-size: 1.1rem;
            color: #0d1b2a;
            padding: 0.2rem 0;
        }
        .toc ol {
            margin-top: 0.8rem;
            margin-bottom: 0;
            padding-left: 1.2rem;
        }
        .toc ol li {
            margin-bottom: 0.3rem;
        }
        .toc a {
            color: #2c5282;
        }
        @media (max-width: 992px) {
            .main-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                position: static;
                display: grid;
                grid-template-columns: 1fr 1fr;
                gap: 1rem;
            }
            .footer-inner {
                grid-template-columns: 1fr 1fr;
            }
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.35rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: rgba(10, 22, 40, 0.98);
                padding: 0.8rem 0.5rem;
                border-radius: 12px;
                margin-top: 0.5rem;
                gap: 0.2rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 0.6rem 1rem;
                border-radius: 8px;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .sidebar {
                grid-template-columns: 1fr;
            }
            .footer-inner {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
            .breadcrumbs ol {
                font-size: 0.78rem;
            }
            .search-form input[type="text"] {
                min-width: 140px;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.9rem;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .my-logo i {
                font-size: 1.2rem;
            }
            h1 {
                font-size: 1.4rem;
            }
            .search-form button {
                padding: 0.6rem 1.2rem;
                font-size: 0.85rem;
            }
            .feedback-card {
                padding: 1rem;
            }
            .featured-image-wrap {
                margin: 1rem 0;
            }
        }
        .text-muted {
            color: #4a5568;
            font-size: 0.9rem;
        }
        .last-updated {
            display: inline-block;
            background: #edf2f7;
            padding: 0.25rem 0.9rem;
            border-radius: 40px;
            font-size: 0.8rem;
            color: #2d3748;
            margin-bottom: 1rem;
        }
        .last-updated i {
            margin-right: 0.3rem;
        }
        .highlight-box {
            background: #f0f4fe;
            border-left: 4px solid #1a2a4a;
            padding: 1rem 1.3rem;
            border-radius: 0 10px 10px 0;
            margin: 1.2rem 0;
        }
        .emoji-big {
            font-size: 1.4rem;
            display: inline-block;
            margin-right: 0.2rem;
        }
        .btn-top {
            position: fixed;
            bottom: 1.8rem;
            right: 1.8rem;
            background: #1a2a4a;
            color: #fff;
            width: 44px;
            height: 44px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.2rem;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.2);
            transition: transform 0.25s, opacity 0.25s;
            opacity: 0.7;
            z-index: 900;
        }
        .btn-top:hover {
            transform: translateY(-4px);
            opacity: 1;
            color: #fff;
        }
        @media (max-width: 480px) {
            .btn-top {
                bottom: 1rem;
                right: 1rem;
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }
        }