*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
            background: #f5f7fb;
            color: #1e2a3a;
            line-height: 1.75;
            padding: 0 0 2rem 0;
            max-width: 1280px;
            margin: 0 auto;
            background-image: linear-gradient(145deg, #f5f7fb 0%, #eef1f7 100%);
        }
        a {
            color: #1a5276;
            text-decoration: none;
            transition: color 0.2s, border-bottom 0.2s;
            border-bottom: 1px solid transparent;
        }
        a:hover,
        a:focus-visible {
            color: #b22222;
            border-bottom-color: #b22222;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            letter-spacing: -0.01em;
            color: #0b1c2e;
        }
        h1 {
            font-size: 2.4rem;
            margin-bottom: 0.75rem;
            border-left: 6px solid #b22222;
            padding-left: 1.2rem;
        }
        h2 {
            font-size: 1.9rem;
            margin: 2.8rem 0 1.2rem 0;
            border-bottom: 2px solid rgba(178, 34, 34, 0.25);
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.5rem;
            margin: 2rem 0 0.8rem 0;
            color: #1a3a4a;
        }
        h4 {
            font-size: 1.2rem;
            margin: 1.4rem 0 0.5rem 0;
            color: #2c3e50;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.1rem;
            font-size: 1.05rem;
            color: #1e2a3a;
        }
        .container {
            background: #ffffff;
            border-radius: 28px;
            padding: 2.2rem 2.8rem;
            margin: 1.2rem 1.2rem 2rem 1.2rem;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.04);
            backdrop-filter: blur(2px);
            border: 1px solid rgba(255, 255, 255, 0.5);
        }
        @media (max-width: 768px) {
            .container {
                padding: 1.2rem 1rem;
                margin: 0.6rem 0.6rem 1.2rem 0.6rem;
                border-radius: 16px;
            }
            h1 {
                font-size: 1.7rem;
                padding-left: 0.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            p {
                font-size: 0.98rem;
            }
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1.2rem 2.8rem;
            background: rgba(255, 255, 255, 0.85);
            backdrop-filter: blur(10px);
            border-radius: 0 0 28px 28px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.03);
            border-bottom: 1px solid rgba(0, 0, 0, 0.04);
            margin: 0 1.2rem;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #0b1c2e, #b22222);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            border-bottom: none !important;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo i {
            font-size: 1.8rem;
            -webkit-text-fill-color: #b22222;
            color: #b22222;
        }
        .my-logo:hover {
            opacity: 0.85;
            border-bottom: none !important;
        }
        .logo-sub {
            font-size: 0.75rem;
            font-weight: 400;
            letter-spacing: 1.2px;
            color: #4a5b6e;
            display: block;
            -webkit-text-fill-color: #4a5b6e;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 1.2rem;
        }
        .main-nav {
            display: flex;
            gap: 0.2rem;
            flex-wrap: wrap;
            list-style: none;
        }
        .main-nav li a {
            padding: 0.5rem 1rem;
            border-radius: 40px;
            font-weight: 500;
            font-size: 0.92rem;
            color: #1e2a3a;
            border: 1px solid transparent;
            transition: background 0.2s, border-color 0.2s, color 0.2s;
            border-bottom: none;
        }
        .main-nav li a:hover,
        .main-nav li a:focus-visible {
            background: rgba(178, 34, 34, 0.07);
            border-color: rgba(178, 34, 34, 0.2);
            color: #b22222;
            border-bottom: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #1e2a3a;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(0, 0, 0, 0.04);
        }
        @media (max-width: 820px) {
            .site-header {
                padding: 1rem 1.2rem;
                margin: 0 0.6rem;
                border-radius: 0 0 16px 16px;
            }
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                margin-top: 1rem;
                background: #ffffff;
                border-radius: 16px;
                padding: 0.8rem 0.4rem;
                box-shadow: 0 12px 32px rgba(0, 0, 0, 0.08);
                border: 1px solid #eee;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav li a {
                padding: 0.6rem 1.2rem;
                border-radius: 30px;
            }
            .nav-wrapper {
                flex-wrap: wrap;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.8rem;
            font-size: 0.88rem;
            color: #5a6a7a;
            padding: 0.8rem 0 0.2rem 0;
            margin: 0 1.2rem;
            border-bottom: 1px solid rgba(0, 0, 0, 0.04);
        }
        .breadcrumb a {
            color: #1a5276;
            border-bottom: none;
        }
        .breadcrumb a:hover {
            color: #b22222;
        }
        .breadcrumb span {
            color: #8a9aaa;
        }
        @media (max-width: 768px) {
            .breadcrumb {
                margin: 0 0.6rem;
                font-size: 0.78rem;
            }
        }
        .search-section {
            background: #f0f4fa;
            border-radius: 60px;
            padding: 0.3rem 0.3rem 0.3rem 1.6rem;
            display: flex;
            align-items: center;
            max-width: 460px;
            margin: 1.2rem 0 1.8rem 0;
            border: 1px solid rgba(0, 0, 0, 0.05);
            transition: box-shadow 0.25s;
        }
        .search-section:focus-within {
            box-shadow: 0 0 0 3px rgba(178, 34, 34, 0.15);
            border-color: #b22222;
        }
        .search-section input {
            flex: 1;
            border: none;
            background: transparent;
            padding: 0.8rem 0.2rem;
            font-size: 1rem;
            outline: none;
            color: #1e2a3a;
            min-width: 0;
        }
        .search-section input::placeholder {
            color: #8a9aaa;
            font-style: italic;
        }
        .search-section button {
            background: #b22222;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.7rem 1.8rem;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            white-space: nowrap;
        }
        .search-section button:hover {
            background: #8b1a1a;
            transform: scale(0.98);
        }
        @media (max-width: 480px) {
            .search-section {
                flex-wrap: wrap;
                border-radius: 30px;
                padding: 0.3rem;
            }
            .search-section input {
                padding: 0.6rem 0.8rem;
                width: 100%;
            }
            .search-section button {
                width: 100%;
                justify-content: center;
                padding: 0.6rem;
                border-radius: 30px;
            }
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.8rem 0 1.2rem 0;
            padding: 1.8rem 2rem;
            background: #f9faff;
            border-radius: 24px;
            border: 1px solid rgba(0, 0, 0, 0.03);
        }
        .feedback-grid form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .feedback-grid label {
            font-weight: 600;
            font-size: 0.95rem;
            color: #1a3a4a;
        }
        .feedback-grid textarea,
        .feedback-grid input {
            padding: 0.8rem 1rem;
            border: 1px solid #dce2ec;
            border-radius: 16px;
            font-size: 0.95rem;
            font-family: inherit;
            resize: vertical;
            transition: border 0.2s, box-shadow 0.2s;
            background: #ffffff;
        }
        .feedback-grid textarea:focus,
        .feedback-grid input:focus {
            border-color: #b22222;
            box-shadow: 0 0 0 3px rgba(178, 34, 34, 0.08);
            outline: none;
        }
        .feedback-grid .btn-submit {
            background: #0b1c2e;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.7rem 1.8rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            align-self: flex-start;
        }
        .feedback-grid .btn-submit:hover {
            background: #b22222;
            transform: scale(0.98);
        }
        .rating-stars {
            display: flex;
            gap: 0.2rem;
            font-size: 1.6rem;
            color: #f5b342;
            cursor: default;
        }
        .rating-stars i {
            transition: transform 0.15s, color 0.15s;
            cursor: pointer;
        }
        .rating-stars i:hover {
            transform: scale(1.25);
            color: #e09d2f;
        }
        @media (max-width: 700px) {
            .feedback-grid {
                grid-template-columns: 1fr;
                gap: 1.6rem;
                padding: 1.2rem;
            }
        }
        .toc {
            background: #f1f5fa;
            border-radius: 20px;
            padding: 1.6rem 2rem;
            margin: 1.8rem 0 2.4rem 0;
            border-left: 4px solid #b22222;
        }
        .toc strong {
            font-size: 1.2rem;
            display: block;
            margin-bottom: 0.6rem;
            color: #0b1c2e;
        }
        .toc ol {
            columns: 2;
            column-gap: 2rem;
            padding-left: 1.4rem;
        }
        .toc ol li {
            margin-bottom: 0.3rem;
            break-inside: avoid;
        }
        .toc ol li a {
            color: #1a5276;
            border-bottom: 1px dotted rgba(26, 82, 118, 0.3);
        }
        .toc ol li a:hover {
            color: #b22222;
            border-bottom-color: #b22222;
        }
        @media (max-width: 600px) {
            .toc ol {
                columns: 1;
            }
            .toc {
                padding: 1.2rem;
            }
        }
        .feature-image {
            margin: 2rem 0 2.2rem 0;
            border-radius: 16px;
            overflow: hidden;
        }
        .feature-image img {
            width: 100%;
            max-height: 520px;
            object-fit: cover;
        }
        .image-caption {
            font-size: 0.88rem;
            color: #5a6a7a;
            padding: 0.6rem 0 0 0.4rem;
            font-style: italic;
        }
        .inset-link {
            background: #f4f7fc;
            border-radius: 12px;
            padding: 0.15rem 0.8rem 0.15rem 0.8rem;
            display: inline-block;
            font-weight: 500;
            border: 1px solid #e6ecf3;
            transition: all 0.2s;
        }
        .inset-link:hover {
            background: #e6ecf3;
            border-color: #b22222;
        }
        .site-footer {
            margin: 2.8rem 1.2rem 0.6rem 1.2rem;
            padding: 2rem 2.8rem 1.4rem 2.8rem;
            background: #ffffff;
            border-radius: 28px;
            box-shadow: 0 8px 28px rgba(0, 0, 0, 0.03);
            border-top: 2px solid rgba(178, 34, 34, 0.08);
        }
        .site-footer friend-link {
            display: block;
            margin: 1.2rem 0 0.8rem 0;
            font-weight: 500;
            color: #1e2a3a;
        }
        .site-footer friend-link a {
            display: inline-block;
            margin-right: 1.4rem;
            margin-bottom: 0.4rem;
            color: #1a5276;
            border-bottom: 1px dotted rgba(26, 82, 118, 0.25);
        }
        .site-footer friend-link a:hover {
            color: #b22222;
            border-bottom-color: #b22222;
        }
        .copyright {
            font-size: 0.88rem;
            color: #6a7a8a;
            border-top: 1px solid #eef2f7;
            padding-top: 1.2rem;
            margin-top: 1rem;
            text-align: center;
        }
        @media (max-width: 768px) {
            .site-footer {
                padding: 1.2rem 1rem;
                margin: 1.6rem 0.6rem 0.6rem 0.6rem;
                border-radius: 16px;
            }
        }
        .badge {
            display: inline-block;
            background: #b22222;
            color: #fff;
            font-size: 0.7rem;
            font-weight: 700;
            padding: 0.15rem 0.7rem;
            border-radius: 40px;
            letter-spacing: 0.3px;
            text-transform: uppercase;
            vertical-align: middle;
            margin-right: 0.3rem;
        }
        .highlight-box {
            background: #fcf8f3;
            border-left: 4px solid #b22222;
            padding: 1.2rem 1.8rem;
            border-radius: 12px;
            margin: 1.6rem 0;
        }
        .emoji-big {
            font-size: 1.4rem;
            margin-right: 0.2rem;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1.2rem;
            margin: 1.6rem 0;
        }
        .stat-card {
            background: #f4f8ff;
            border-radius: 16px;
            padding: 1.2rem 1rem;
            text-align: center;
            border: 1px solid #e8edf6;
        }
        .stat-card .num {
            font-size: 2rem;
            font-weight: 800;
            color: #b22222;
            line-height: 1.2;
        }
        .stat-card .label {
            font-size: 0.85rem;
            color: #4a5b6e;
            font-weight: 500;
        }
        @media (max-width: 480px) {
            .stat-card .num {
                font-size: 1.5rem;
            }
            .stats-grid {
                grid-template-columns: 1fr 1fr;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #0b1c2e;
            color: #fff;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
            border: none;
            font-size: 1.3rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.2s;
            z-index: 999;
            opacity: 0.8;
        }
        .scroll-top:hover {
            background: #b22222;
            transform: translateY(-4px);
            opacity: 1;
        }
        @media (max-width: 600px) {
            .scroll-top {
                bottom: 1rem;
                right: 1rem;
                width: 40px;
                height: 40px;
                font-size: 1rem;
            }
        }
        .updated-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
            background: #eaf3ea;
            color: #1f6b3a;
            font-size: 0.8rem;
            padding: 0.2rem 1rem 0.2rem 0.8rem;
            border-radius: 40px;
            font-weight: 500;
            border: 1px solid #cde0cd;
        }