*,
        *::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: #0b0e14;
            color: #e8edf5;
            line-height: 1.75;
            padding: 0;
            margin: 0;
            min-height: 100vh;
        }
        a {
            color: #7aa9ff;
            text-decoration: none;
            transition: color 0.25s ease;
        }
        a:hover {
            color: #b3d0ff;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.3;
            color: #f0f4ff;
            margin-top: 1.8rem;
            margin-bottom: 0.6rem;
        }
        h1 {
            font-size: 2.4rem;
            border-left: 6px solid #f5a623;
            padding-left: 1rem;
        }
        h2 {
            font-size: 1.8rem;
            border-bottom: 2px solid #2a3344;
            padding-bottom: 0.4rem;
        }
        h3 {
            font-size: 1.4rem;
            color: #d4e0ff;
        }
        h4 {
            font-size: 1.15rem;
            color: #b8c8f0;
        }
        p {
            margin-bottom: 1rem;
            color: #d0d8e8;
        }
        strong,
        b {
            color: #ffffff;
            font-weight: 600;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: #131a26;
            border-bottom: 2px solid #2a3344;
            padding: 12px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(8px);
            background-color: rgba(13, 18, 28, 0.92);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            gap: 10px 20px;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #f5a623, #ff7b2b);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            text-shadow: 0 0 20px rgba(245, 166, 35, 0.15);
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .my-logo i {
            background: none;
            -webkit-text-fill-color: #f5a623;
            font-size: 1.6rem;
        }
        .my-logo small {
            font-size: 0.7rem;
            -webkit-text-fill-color: #8899bb;
            font-weight: 400;
            letter-spacing: 0.3px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid #3a4a5e;
            color: #e8edf5;
            font-size: 1.6rem;
            padding: 6px 14px;
            border-radius: 8px;
            cursor: pointer;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: #1f2a38;
        }
        .main-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 8px 16px;
            align-items: center;
        }
        .main-nav a {
            color: #c8d4e8;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 4px 10px;
            border-radius: 6px;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            background: #1f2a38;
            color: #f0f4ff;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 6px;
            font-size: 0.85rem;
            color: #f5a623;
        }
        .breadcrumb {
            background: #10161f;
            padding: 10px 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #1e2735;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li {
            display: flex;
            align-items: center;
            gap: 6px;
            margin: 0;
            color: #8899bb;
        }
        .breadcrumb li+li::before {
            content: "›";
            color: #f5a623;
            font-weight: 700;
            margin-right: 6px;
        }
        .breadcrumb a {
            color: #7aa9ff;
        }
        .breadcrumb .current {
            color: #d0d8e8;
        }
        .hero {
            padding: 40px 0 30px;
            text-align: center;
        }
        .hero h1 {
            font-size: 2.8rem;
            border-left: none;
            padding-left: 0;
            margin-top: 0;
        }
        .hero .tagline {
            font-size: 1.2rem;
            color: #aabbdd;
            max-width: 720px;
            margin: 10px auto 0;
        }
        .hero .meta-info {
            display: flex;
            flex-wrap: wrap;
            justify-content: center;
            gap: 16px 30px;
            margin-top: 18px;
            font-size: 0.9rem;
            color: #8899bb;
        }
        .hero .meta-info i {
            color: #f5a623;
            margin-right: 6px;
        }
        .search-section {
            background: #131a26;
            border-radius: 16px;
            padding: 30px 24px;
            margin: 20px 0 30px;
            border: 1px solid #2a3344;
        }
        .search-section form {
            display: flex;
            flex-wrap: wrap;
            gap: 12px;
            max-width: 640px;
            margin: 0 auto;
        }
        .search-section input[type="text"] {
            flex: 1;
            min-width: 200px;
            padding: 14px 18px;
            border-radius: 10px;
            border: 2px solid #2a3344;
            background: #0b0e14;
            color: #e8edf5;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .search-section input[type="text"]:focus {
            outline: none;
            border-color: #f5a623;
        }
        .search-section button {
            padding: 14px 32px;
            border: none;
            border-radius: 10px;
            background: linear-gradient(135deg, #f5a623, #e07c1a);
            color: #0b0e14;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-section button:hover {
            transform: scale(1.02);
            box-shadow: 0 8px 24px rgba(245, 166, 35, 0.3);
        }
        .toc {
            background: #10161f;
            border: 1px solid #1e2735;
            border-radius: 14px;
            padding: 24px 28px;
            margin: 30px 0 40px;
        }
        .toc summary {
            font-size: 1.3rem;
            font-weight: 700;
            cursor: pointer;
            color: #f5a623;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .toc ol {
            margin-top: 16px;
            columns: 2;
            column-gap: 40px;
            list-style: none;
            counter-reset: toc-counter;
        }
        .toc ol li {
            counter-increment: toc-counter;
            margin-bottom: 8px;
            break-inside: avoid;
        }
        .toc ol li::before {
            content: counter(toc-counter) ". ";
            color: #f5a623;
            font-weight: 700;
        }
        .toc a {
            color: #c8d4e8;
            font-weight: 500;
        }
        .toc a:hover {
            color: #f5a623;
            text-decoration: none;
        }
        @media (max-width:640px) {
            .toc ol {
                columns: 1;
            }
        }
        .content-card {
            background: #131a26;
            border-radius: 16px;
            padding: 28px 30px;
            margin: 24px 0;
            border: 1px solid #1e2735;
            transition: border-color 0.3s;
        }
        .content-card:hover {
            border-color: #2a3344;
        }
        .content-card h2,
        .content-card h3,
        .content-card h4 {
            margin-top: 0.6rem;
        }
        .img-wrapper {
            margin: 24px 0;
            border-radius: 14px;
            overflow: hidden;
            background: #0b0e14;
            padding: 8px;
            border: 1px solid #1e2735;
        }
        .img-wrapper img {
            border-radius: 10px;
            width: 100%;
            height: auto;
            max-height: 500px;
            object-fit: cover;
        }
        .img-wrapper figcaption {
            text-align: center;
            padding: 10px 8px 4px;
            font-size: 0.85rem;
            color: #8899bb;
            font-style: italic;
        }
        .link-list {
            display: flex;
            flex-wrap: wrap;
            gap: 10px 18px;
            padding: 12px 0;
            list-style: none;
        }
        .link-list li a {
            display: inline-flex;
            align-items: center;
            gap: 6px;
            background: #1a2332;
            padding: 6px 16px;
            border-radius: 20px;
            font-size: 0.9rem;
            border: 1px solid #2a3344;
            transition: background 0.2s, border-color 0.2s;
        }
        .link-list li a:hover {
            background: #243040;
            border-color: #f5a623;
            text-decoration: none;
        }
        .link-list li a i {
            color: #f5a623;
            font-size: 0.8rem;
        }
        .feedback-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 24px;
            margin: 40px 0;
        }
        @media (max-width:720px) {
            .feedback-section {
                grid-template-columns: 1fr;
            }
        }
        .feedback-card {
            background: #131a26;
            border: 1px solid #1e2735;
            border-radius: 16px;
            padding: 24px 26px;
        }
        .feedback-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .feedback-card h3 i {
            color: #f5a623;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 14px;
            margin-top: 16px;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 12px 16px;
            border-radius: 10px;
            border: 2px solid #2a3344;
            background: #0b0e14;
            color: #e8edf5;
            font-size: 0.95rem;
            transition: border 0.3s;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            outline: none;
            border-color: #f5a623;
        }
        .feedback-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .feedback-card button {
            align-self: flex-start;
            padding: 12px 28px;
            border: none;
            border-radius: 10px;
            background: linear-gradient(135deg, #f5a623, #e07c1a);
            color: #0b0e14;
            font-weight: 700;
            font-size: 1rem;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card button:hover {
            transform: scale(1.02);
            box-shadow: 0 8px 24px rgba(245, 166, 35, 0.25);
        }
        .site-footer {
            background: #0d131f;
            border-top: 2px solid #1e2735;
            padding: 40px 0 20px;
            margin-top: 50px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 30px;
            margin-bottom: 30px;
        }
        @media (max-width:720px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 20px;
            }
        }
        .footer-grid h4 {
            margin-top: 0;
            color: #f5a623;
        }
        .footer-grid ul {
            list-style: none;
            padding: 0;
        }
        .footer-grid ul li {
            margin-bottom: 6px;
        }
        .footer-grid ul li a {
            color: #8899bb;
        }
        .footer-grid ul li a:hover {
            color: #f0f4ff;
        }
        friend-link {
            display: block;
            padding: 12px 0;
            border-top: 1px solid #1e2735;
            border-bottom: 1px solid #1e2735;
            margin: 20px 0;
            font-size: 0.9rem;
        }
        friend-link a {
            display: inline-block;
            margin: 4px 12px 4px 0;
            color: #7aa9ff;
        }
        friend-link a:hover {
            color: #f5a623;
            text-decoration: none;
        }
        .copyright {
            text-align: center;
            color: #556688;
            font-size: 0.85rem;
            padding-top: 20px;
            border-top: 1px solid #1a2332;
        }
        .copyright strong {
            color: #8899bb;
        }
        @media (max-width:768px) {
            .header-inner {
                flex-wrap: wrap;
            }
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                align-items: flex-start;
                padding: 12px 0 4px;
                gap: 6px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 8px 12px;
                width: 100%;
                border-radius: 6px;
            }
            .main-nav a:hover {
                background: #1f2a38;
            }
            .hero h1 {
                font-size: 2rem;
            }
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
            }
            h3 {
                font-size: 1.2rem;
            }
            .content-card {
                padding: 20px 18px;
            }
            .feedback-card {
                padding: 20px 18px;
            }
        }
        @media (max-width:480px) {
            .hero h1 {
                font-size: 1.6rem;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .search-section input[type="text"] {
                min-width: 140px;
            }
            .search-section button {
                padding: 12px 20px;
            }
            .toc {
                padding: 16px 18px;
            }
        }
        ::selection {
            background: #f5a623;
            color: #0b0e14;
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #f5a623;
            color: #0b0e14;
            width: 48px;
            height: 48px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.4rem;
            box-shadow: 0 8px 24px rgba(245, 166, 35, 0.3);
            transition: transform 0.2s, opacity 0.3s;
            z-index: 50;
            border: none;
            cursor: pointer;
            opacity: 0.8;
        }
        .scroll-top:hover {
            transform: scale(1.08);
            opacity: 1;
        }
        @media (max-width:480px) {
            .scroll-top {
                bottom: 16px;
                right: 16px;
                width: 40px;
                height: 40px;
                font-size: 1.2rem;
            }
        }