*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
            -webkit-text-size-adjust: 100%;
        }
        body {
            font-family: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
            background: #0d0f14;
            color: #e8edf3;
            line-height: 1.7;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
        }
        a {
            color: #7cb8ff;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover,
        a:focus-visible {
            color: #b6d8ff;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            font-weight: 700;
            line-height: 1.25;
            color: #f0f4fc;
            margin-top: 1.8em;
            margin-bottom: 0.5em;
        }
        h1 {
            font-size: 2.4rem;
            margin-top: 0.4em;
            border-bottom: 3px solid #4f7eb3;
            padding-bottom: 0.25em;
        }
        h2 {
            font-size: 1.8rem;
            border-bottom: 2px solid #2d4059;
            padding-bottom: 0.2em;
        }
        h3 {
            font-size: 1.35rem;
            color: #cddfff;
        }
        h4 {
            font-size: 1.1rem;
            color: #b0c8e5;
        }
        p {
            margin-bottom: 1.2em;
        }
        strong,
        b {
            color: #ffffff;
            font-weight: 600;
        }
        em {
            color: #c5d9f0;
        }
        hr {
            border: none;
            border-top: 2px solid #2a3442;
            margin: 2.5rem 0;
        }
        .container {
            max-width: 1140px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .badge {
            display: inline-block;
            background: #1e2a3a;
            padding: 0.2rem 1rem;
            border-radius: 30px;
            font-size: 0.8rem;
            color: #b0cff0;
            border: 1px solid #3a506e;
        }
        header {
            background: #131720;
            border-bottom: 2px solid #1e2c3e;
            position: sticky;
            top: 0;
            z-index: 100;
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
            padding: 0.7rem 0;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            color: #f0f6ff;
            letter-spacing: -0.02em;
            background: linear-gradient(135deg, #7cb8ff, #b6d8ff);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo i {
            background: none;
            -webkit-text-fill-color: #7cb8ff;
            font-size: 1.4rem;
        }
        .my-logo:hover {
            opacity: 0.9;
            text-decoration: none;
        }
        .nav-menu {
            display: flex;
            align-items: center;
            gap: 1.2rem;
            flex-wrap: wrap;
        }
        .nav-menu a {
            color: #c8d6e8;
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.4rem 0.2rem;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .nav-menu a:hover,
        .nav-menu a.active {
            color: #fff;
            border-bottom-color: #7cb8ff;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #e8edf3;
            font-size: 1.8rem;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #1e2a3a;
        }
        .nav-toggle {
            display: none;
        }
        .nav-toggle:checked~.nav-menu {
            display: flex;
            flex-direction: column;
            width: 100%;
            padding: 1rem 0 0.5rem;
            gap: 0.6rem;
        }
        .nav-toggle:checked~.nav-menu a {
            width: 100%;
            padding: 0.5rem 0.8rem;
            border-bottom: 1px solid #2a3442;
        }
        .breadcrumb {
            background: #181e28;
            padding: 0.6rem 0;
            border-bottom: 1px solid #232e3e;
            font-size: 0.85rem;
        }
        .breadcrumb ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.4rem 0.8rem;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #6a7e9e;
        }
        .breadcrumb a {
            color: #90a9c9;
        }
        .breadcrumb a:hover {
            color: #fff;
        }
        .breadcrumb .current {
            color: #c5d9f0;
            font-weight: 500;
        }
        .hero-image-wrap {
            margin: 1.8rem 0 2.2rem;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.6);
            background: #1a2330;
            position: relative;
        }
        .hero-image-wrap img {
            width: 100%;
            aspect-ratio: 16/9;
            object-fit: cover;
            display: block;
        }
        .hero-image-wrap .img-credit {
            position: absolute;
            bottom: 8px;
            right: 12px;
            background: rgba(0, 0, 0, 0.7);
            color: #b0c8e5;
            font-size: 0.75rem;
            padding: 0.2rem 0.8rem;
            border-radius: 20px;
            backdrop-filter: blur(4px);
        }
        .search-section {
            background: #161e2a;
            border-radius: 16px;
            padding: 1.8rem 2rem;
            margin: 2rem 0;
            border: 1px solid #263545;
        }
        .search-form {
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem;
            align-items: center;
        }
        .search-form input[type="text"] {
            flex: 1 1 240px;
            padding: 0.8rem 1.2rem;
            border-radius: 40px;
            border: 2px solid #2d4059;
            background: #0d121c;
            color: #e8edf3;
            font-size: 1rem;
            outline: none;
            transition: border-color 0.3s;
        }
        .search-form input[type="text"]:focus {
            border-color: #7cb8ff;
        }
        .search-form button {
            background: #2d4059;
            border: none;
            color: #fff;
            padding: 0.8rem 2rem;
            border-radius: 40px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            transition: background 0.25s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-form button:hover {
            background: #3f5a7a;
        }
        .interaction-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2.8rem 0;
        }
        @media (max-width:700px) {
            .interaction-grid {
                grid-template-columns: 1fr;
            }
        }
        .card-interact {
            background: #141c28;
            border-radius: 16px;
            padding: 1.8rem 2rem;
            border: 1px solid #263545;
        }
        .card-interact h3 {
            margin-top: 0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .card-interact form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.8rem;
        }
        .card-interact textarea,
        .card-interact input[type="text"],
        .card-interact input[type="number"],
        .card-interact select {
            padding: 0.7rem 1rem;
            border-radius: 10px;
            border: 2px solid #2d4059;
            background: #0d121c;
            color: #e8edf3;
            font-size: 0.95rem;
            outline: none;
            transition: border-color 0.25s;
            font-family: inherit;
        }
        .card-interact textarea:focus,
        .card-interact input:focus,
        .card-interact select:focus {
            border-color: #7cb8ff;
        }
        .card-interact textarea {
            min-height: 100px;
            resize: vertical;
        }
        .card-interact button {
            background: #2d4059;
            border: none;
            color: #fff;
            padding: 0.7rem 1.5rem;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.25s;
            align-self: flex-start;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }
        .card-interact button:hover {
            background: #3f5a7a;
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
            font-size: 1.6rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            cursor: pointer;
            color: #3a506e;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5c842;
        }
        .toc {
            background: #131b26;
            border-radius: 16px;
            padding: 1.6rem 2rem;
            border: 1px solid #263545;
            margin: 2rem 0;
        }
        .toc h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            columns: 2 240px;
            column-gap: 2rem;
        }
        .toc li {
            margin: 0.4rem 0;
            break-inside: avoid;
        }
        .toc a {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.2rem 0;
        }
        .toc a::before {
            content: "▸";
            color: #4f7eb3;
        }
        .content-area {
            background: #0f151e;
            border-radius: 20px;
            padding: 2.2rem 2.5rem;
            margin: 1.5rem 0 2.5rem;
            border: 1px solid #1e2c3e;
        }
        @media (max-width:640px) {
            .content-area {
                padding: 1.2rem 1.2rem;
            }
        }
        .content-area .inline-img {
            margin: 1.8rem 0;
            border-radius: 14px;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.5);
        }
        .content-area .inline-img figcaption {
            text-align: center;
            font-size: 0.85rem;
            color: #8aa3c5;
            margin-top: 0.5rem;
        }
        .link-list-inline {
            display: inline-flex;
            flex-wrap: wrap;
            gap: 0.4rem 1rem;
            background: #131b26;
            padding: 0.8rem 1.4rem;
            border-radius: 40px;
            margin: 0.8rem 0 1.2rem;
            border: 1px solid #263545;
        }
        .link-list-inline a {
            font-weight: 500;
        }
        .data-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.5rem 0;
            background: #111924;
            border-radius: 12px;
            overflow: hidden;
            border: 1px solid #263545;
        }
        .data-table th {
            background: #1a2638;
            padding: 0.8rem 1rem;
            text-align: left;
            font-weight: 600;
            color: #b6d8ff;
        }
        .data-table td {
            padding: 0.7rem 1rem;
            border-top: 1px solid #1e2c3e;
        }
        .data-table tr:hover td {
            background: #1a2332;
        }
        blockquote {
            border-left: 4px solid #4f7eb3;
            padding: 1rem 1.8rem;
            margin: 1.8rem 0;
            background: #131b26;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #c5d9f0;
        }
        blockquote cite {
            display: block;
            margin-top: 0.6rem;
            font-size: 0.85rem;
            color: #8aa3c5;
            font-style: normal;
        }
        .tip-box {
            background: #1a2738;
            border-left: 5px solid #7cb8ff;
            padding: 1.2rem 1.8rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        footer {
            background: #0d121c;
            border-top: 2px solid #1e2c3e;
            padding: 2.5rem 0 1.2rem;
            margin-top: auto;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr;
            gap: 2rem;
            margin-bottom: 1.8rem;
        }
        @media (max-width:600px) {
            .footer-grid {
                grid-template-columns: 1fr;
            }
        }
        friend-link {
            display: block;
        }
        friend-link h4 {
            margin-top: 0;
            font-size: 1.1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        friend-link ul {
            list-style: none;
            padding: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem 1.4rem;
            margin-top: 0.6rem;
        }
        friend-link a {
            color: #90a9c9;
        }
        friend-link a:hover {
            color: #fff;
        }
        .copyright {
            border-top: 1px solid #1e2c3e;
            padding-top: 1.2rem;
            font-size: 0.85rem;
            color: #6a7e9e;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            gap: 0.8rem;
        }
        .copyright a {
            color: #7cb8ff;
        }
        @media (max-width:768px) {
            .hamburger {
                display: block;
            }
            .nav-menu {
                display: none;
                width: 100%;
                order: 3;
            }
            .nav-toggle:checked~.nav-menu {
                display: flex;
            }
            .header-inner {
                align-items: center;
            }
            h1 {
                font-size: 1.8rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .content-area {
                padding: 1rem;
            }
            .search-section {
                padding: 1.2rem;
            }
            .card-interact {
                padding: 1.2rem;
            }
            .toc ul {
                columns: 1;
            }
        }
        @media (max-width:480px) {
            .search-form input[type="text"] {
                flex: 1 1 100%;
            }
            .search-form button {
                width: 100%;
                justify-content: center;
            }
            .star-rating {
                font-size: 1.3rem;
            }
        }
        .skeleton {
            background: linear-gradient(90deg, #1a2332 25%, #222e42 50%, #1a2332 75%);
            background-size: 200% 100%;
            animation: shimmer 1.6s infinite;
            border-radius: 8px;
        }
        @keyframes shimmer {
            0% {
                background-position: 200% 0;
            }
            100% {
                background-position: -200% 0;
            }
        }
        ::-webkit-scrollbar {
            width: 8px;
            height: 8px;
        }
        ::-webkit-scrollbar-track {
            background: #0d121c;
        }
        ::-webkit-scrollbar-thumb {
            background: #2d4059;
            border-radius: 10px;
        }
        ::-webkit-scrollbar-thumb:hover {
            background: #4f7eb3;
        }
        @media print {
            header,
            footer,
            .search-section,
            .interaction-grid,
            .breadcrumb {
                display: none !important;
            }
            body {
                background: #fff;
                color: #111;
            }
            .content-area {
                border: none;
                background: #fff;
                padding: 0;
            }
            a {
                color: #1155cc;
            }
            h1,
            h2,
            h3,
            h4 {
                color: #111;
            }
        }