*,
        *::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: #f5f7fc;
            color: #1a1a2e;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        a {
            color: #1e5a9a;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover,
        a:focus {
            color: #0d3b6b;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        li {
            margin-bottom: 0.4rem;
        }
        .container {
            max-width: 1180px;
            margin: 0 auto;
            padding: 0 1.2rem;
        }
        .site-header {
            background: linear-gradient(135deg, #0d1b2a 0%, #1b2e44 100%);
            padding: 0.8rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 18px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.6rem;
            font-weight: 800;
            letter-spacing: -0.02em;
            color: #f7d44a;
            text-shadow: 0 2px 6px rgba(0, 0, 0, 0.5);
            transition: transform 0.2s;
            display: flex;
            align-items: center;
            gap: 0.3rem;
        }
        .my-logo:hover {
            transform: scale(1.02);
            color: #ffe174;
            text-decoration: none;
        }
        .my-logo i {
            font-size: 1.8rem;
            color: #f7d44a;
        }
        .my-logo span {
            font-size: 0.7rem;
            font-weight: 400;
            color: #aac9e6;
            display: block;
            line-height: 1.2;
            letter-spacing: 0.03em;
        }
        .main-nav {
            display: flex;
            align-items: center;
            gap: 0.2rem;
        }
        .main-nav a {
            color: #e8edf3;
            padding: 0.5rem 1rem;
            border-radius: 40px;
            font-size: 0.9rem;
            font-weight: 500;
            transition: background 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            background: rgba(255, 255, 255, 0.12);
            color: #f7d44a;
            text-decoration: none;
        }
        .main-nav a.active {
            background: rgba(247, 212, 74, 0.18);
            color: #f7d44a;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: #e8edf3;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 0.2rem 0.6rem;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: rgba(255, 255, 255, 0.08);
        }
        .nav-overlay {
            display: none;
        }
        .breadcrumbs {
            background: #e9edf4;
            padding: 0.6rem 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #d0d9e6;
        }
        .breadcrumbs ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
            padding: 0;
            margin: 0;
        }
        .breadcrumbs li+li::before {
            content: "›";
            margin-right: 0.5rem;
            color: #6b7a8f;
            font-weight: 600;
        }
        .breadcrumbs a {
            color: #1e5a9a;
        }
        .breadcrumbs .current {
            color: #2c3e50;
            font-weight: 500;
        }
        .page-wrap {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 2.5rem;
            margin: 2rem 0 3rem;
        }
        @media (max-width: 920px) {
            .page-wrap {
                grid-template-columns: 1fr;
            }
        }
        .article-body h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.2;
            color: #0b1c2e;
            margin-bottom: 0.5rem;
            letter-spacing: -0.01em;
        }
        .article-body h1 i {
            color: #f7b731;
            margin-right: 0.4rem;
        }
        .meta-info {
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem;
            font-size: 0.9rem;
            color: #4a5b6e;
            margin-bottom: 1.8rem;
            border-bottom: 1px solid #dce2ec;
            padding-bottom: 0.9rem;
        }
        .meta-info i {
            margin-right: 0.35rem;
            color: #1e5a9a;
        }
        .last-updated {
            font-weight: 600;
            color: #1a3b5c;
        }
        .article-body h2 {
            font-size: 1.8rem;
            font-weight: 700;
            color: #0f293f;
            margin-top: 2.8rem;
            margin-bottom: 1rem;
            border-left: 5px solid #f7b731;
            padding-left: 1rem;
        }
        .article-body h3 {
            font-size: 1.35rem;
            font-weight: 600;
            color: #1a3e5c;
            margin-top: 2rem;
            margin-bottom: 0.7rem;
        }
        .article-body h4 {
            font-size: 1.1rem;
            font-weight: 600;
            color: #2a4a6a;
            margin-top: 1.4rem;
            margin-bottom: 0.4rem;
        }
        .article-body p {
            margin-bottom: 1.2rem;
            color: #1e2a3a;
        }
        .article-body strong {
            color: #0b1c2e;
        }
        .article-body .highlight-box {
            background: #eef3fa;
            border-left: 6px solid #f7b731;
            padding: 1.2rem 1.6rem;
            border-radius: 0 12px 12px 0;
            margin: 1.6rem 0;
        }
        .article-body .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .featured-img-wrap {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 6px 24px rgba(0, 0, 0, 0.10);
        }
        .featured-img-wrap img {
            width: 100%;
            height: auto;
            aspect-ratio: 16/9;
            object-fit: cover;
            background: #d0d9e6;
        }
        .featured-img-wrap figcaption {
            background: #f0f4fa;
            padding: 0.5rem 1rem;
            font-size: 0.85rem;
            color: #2d4a6a;
            font-style: italic;
        }
        .inline-link-list {
            background: #f2f6fd;
            border-radius: 12px;
            padding: 1rem 1.6rem;
            margin: 1.2rem 0;
            border: 1px solid #d8e2f0;
        }
        .inline-link-list ul {
            list-style: none;
            padding: 0;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
            gap: 0.4rem 1.2rem;
        }
        .inline-link-list li::before {
            content: "🔗 ";
            font-size: 0.8rem;
        }
        .inline-link-list a {
            font-weight: 500;
        }
        .sidebar {
            background: #ffffff;
            border-radius: 18px;
            padding: 1.8rem 1.4rem;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            border: 1px solid #e2e9f2;
            align-self: start;
            position: sticky;
            top: 90px;
        }
        .sidebar h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #0f293f;
            margin-bottom: 1rem;
            border-bottom: 2px solid #f0d67b;
            padding-bottom: 0.5rem;
        }
        .sidebar ul {
            list-style: none;
            padding: 0;
        }
        .sidebar li {
            margin-bottom: 0.5rem;
        }
        .sidebar a {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            padding: 0.4rem 0.6rem;
            border-radius: 8px;
            transition: background 0.15s;
        }
        .sidebar a:hover {
            background: #f0f4fa;
            text-decoration: none;
        }
        .sidebar a i {
            width: 1.2rem;
            color: #f7b731;
        }
        .search-form {
            display: flex;
            gap: 0.4rem;
            margin: 1.2rem 0 0.8rem;
        }
        .search-form input {
            flex: 1;
            padding: 0.6rem 1rem;
            border: 2px solid #d0d9e6;
            border-radius: 40px;
            font-size: 0.9rem;
            outline: none;
            transition: border 0.2s;
        }
        .search-form input:focus {
            border-color: #1e5a9a;
        }
        .search-form button {
            background: #1e5a9a;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.6rem 1.2rem;
            font-size: 0.9rem;
            cursor: pointer;
            transition: background 0.2s;
        }
        .search-form button:hover {
            background: #0d3b6b;
        }
        .interaction-area {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 3rem 0 2rem;
            padding-top: 2rem;
            border-top: 2px solid #dce2ec;
        }
        @media (max-width: 700px) {
            .interaction-area {
                grid-template-columns: 1fr;
            }
        }
        .interaction-card {
            background: #ffffff;
            border-radius: 16px;
            padding: 1.6rem 1.8rem;
            box-shadow: 0 4px 18px rgba(0, 0, 0, 0.04);
            border: 1px solid #e8edf5;
        }
        .interaction-card h3 {
            font-size: 1.2rem;
            font-weight: 700;
            color: #0f293f;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .interaction-card h3 i {
            color: #f7b731;
        }
        .interaction-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .interaction-card input,
        .interaction-card textarea,
        .interaction-card select {
            padding: 0.6rem 1rem;
            border: 2px solid #dce2ec;
            border-radius: 10px;
            font-size: 0.9rem;
            font-family: inherit;
            outline: none;
            transition: border 0.2s;
        }
        .interaction-card input:focus,
        .interaction-card textarea:focus,
        .interaction-card select:focus {
            border-color: #1e5a9a;
        }
        .interaction-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .interaction-card .btn-submit {
            background: #1e5a9a;
            color: #fff;
            border: none;
            border-radius: 40px;
            padding: 0.7rem 1.5rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            align-self: flex-start;
        }
        .interaction-card .btn-submit:hover {
            background: #0d3b6b;
            transform: scale(1.02);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 0.2rem;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.7rem;
            color: #d0d9e6;
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: #f7b731;
        }
        .site-footer {
            background: #0d1b2a;
            color: #c6d4e3;
            padding: 2.5rem 0 1.2rem;
            margin-top: 2rem;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media (max-width: 700px) {
            .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.4rem;
            }
        }
        .footer-brand p {
            font-size: 0.95rem;
            max-width: 360px;
            margin-top: 0.4rem;
        }
        .footer-links h4,
        .footer-friend h4 {
            color: #f7d44a;
            font-size: 1rem;
            margin-bottom: 0.8rem;
            font-weight: 600;
        }
        .footer-links ul,
        .footer-friend ul {
            list-style: none;
            padding: 0;
        }
        .footer-links li,
        .footer-friend li {
            margin-bottom: 0.3rem;
        }
        .footer-links a,
        .footer-friend a {
            color: #aac9e6;
            font-size: 0.9rem;
        }
        .footer-links a:hover,
        .footer-friend a:hover {
            color: #f7d44a;
        }
        .footer-bottom {
            border-top: 1px solid #1f3347;
            padding-top: 1.2rem;
            margin-top: 2rem;
            text-align: center;
            font-size: 0.85rem;
            color: #7a8fa3;
        }
        .footer-bottom a {
            color: #aac9e6;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #0d1b2a;
                padding: 1rem 0 1.2rem;
                border-radius: 0 0 16px 16px;
                margin-top: 0.6rem;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 0.6rem 1.2rem;
                width: 100%;
                border-radius: 0;
            }
            .nav-overlay.active {
                display: block;
                position: fixed;
                inset: 0;
                background: rgba(0, 0, 0, 0.3);
                z-index: -1;
            }
            .article-body h1 {
                font-size: 1.8rem;
            }
            .article-body h2 {
                font-size: 1.4rem;
            }
            .sidebar {
                position: static;
                margin-top: 1.5rem;
            }
            .header-inner {
                position: relative;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 0.9rem;
            }
            .article-body h1 {
                font-size: 1.5rem;
            }
            .meta-info {
                font-size: 0.8rem;
                gap: 0.6rem;
            }
            .my-logo {
                font-size: 1.2rem;
            }
        }
        .skip-link {
            position: absolute;
            top: -100%;
            left: 1rem;
            background: #f7d44a;
            color: #0b1c2e;
            padding: 0.5rem 1.2rem;
            border-radius: 0 0 8px 8px;
            font-weight: 600;
            z-index: 2000;
        }
        .skip-link:focus {
            top: 0;
        }
        :focus-visible {
            outline: 3px solid #f7b731;
            outline-offset: 2px;
        }