* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, system-ui, -apple-system, sans-serif;
            background: #f5f7fa;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #0066c0;
            text-decoration: none;
            transition: color 0.2s ease;
        }
        a:hover {
            color: #003d7a;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #fff;
            box-shadow: 0 0 40px rgba(0, 0, 0, 0.05);
            border-radius: 24px;
            padding: 1.5rem 2rem 2rem;
        }
        @media (max-width: 768px) {
            .container {
                padding: 1rem 1rem 1.5rem;
                border-radius: 16px;
            }
            body {
                padding: 0 0.5rem;
            }
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 1rem 0 1.2rem;
            border-bottom: 2px solid #e6edf4;
            position: relative;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #0b2b40, #1b6b8a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform 0.2s ease;
            display: inline-block;
        }
        .my-logo:hover {
            transform: scale(1.02);
            text-decoration: none;
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: #1b6b8a;
            margin-right: 6px;
        }
        .my-logo small {
            font-size: 0.7rem;
            font-weight: 400;
            letter-spacing: 1px;
            -webkit-text-fill-color: initial;
            color: #4a6a7a;
            display: block;
            line-height: 1;
        }
        .nav-wrapper {
            display: flex;
            align-items: center;
            gap: 1.2rem;
        }
        .main-nav {
            display: flex;
            gap: 1.2rem;
            list-style: none;
            flex-wrap: wrap;
        }
        .main-nav a {
            font-weight: 500;
            padding: 0.4rem 0.6rem;
            border-radius: 8px;
            transition: background 0.2s, color 0.2s;
            font-size: 0.95rem;
        }
        .main-nav a:hover {
            background: #e6edf4;
            color: #003d7a;
            text-decoration: 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: #e6edf4;
        }
        @media (max-width: 860px) {
            .hamburger {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #f5f7fa;
                padding: 1rem;
                border-radius: 16px;
                margin-top: 0.8rem;
                gap: 0.5rem;
            }
            .main-nav.open {
                display: flex;
            }
            .nav-wrapper {
                flex-wrap: wrap;
                justify-content: flex-end;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.8rem 0 0.2rem;
            font-size: 0.9rem;
            color: #4a6a7a;
            gap: 0.3rem 0.6rem;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 0.6rem;
            color: #889aa8;
            font-weight: 700;
        }
        .breadcrumb a {
            color: #0066c0;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .current {
            color: #1e2a3a;
            font-weight: 500;
        }
        .search-bar {
            display: flex;
            max-width: 480px;
            margin: 1.2rem 0 1.8rem;
            border-radius: 60px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
            border: 1px solid #dce5ed;
            transition: box-shadow 0.3s, border-color 0.3s;
        }
        .search-bar:focus-within {
            box-shadow: 0 4px 20px rgba(0, 102, 192, 0.15);
            border-color: #0066c0;
        }
        .search-bar input {
            flex: 1;
            padding: 0.8rem 1.2rem;
            border: none;
            background: #fff;
            font-size: 1rem;
            outline: none;
            min-width: 0;
        }
        .search-bar button {
            background: #0066c0;
            color: #fff;
            border: none;
            padding: 0 1.6rem;
            font-size: 1.1rem;
            cursor: pointer;
            transition: background 0.2s;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .search-bar button:hover {
            background: #003d7a;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            line-height: 1.2;
            margin: 0.8rem 0 1.2rem;
            color: #0b2b40;
            letter-spacing: -0.5px;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin: 2.4rem 0 1rem;
            color: #0b2b40;
            border-left: 6px solid #1b6b8a;
            padding-left: 1.2rem;
        }
        h3 {
            font-size: 1.45rem;
            font-weight: 600;
            margin: 1.8rem 0 0.8rem;
            color: #1a4a5e;
        }
        h4 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 1.2rem 0 0.4rem;
            color: #1a4a5e;
        }
        p {
            margin-bottom: 1.2rem;
            color: #2c3e50;
        }
        .lead {
            font-size: 1.2rem;
            color: #1e2a3a;
            font-weight: 400;
            line-height: 1.8;
            border-left: 3px solid #1b6b8a;
            padding-left: 1.2rem;
            background: #f0f5fa;
            border-radius: 0 12px 12px 0;
            padding: 1rem 1.5rem;
        }
        strong,
        b {
            color: #0b2b40;
        }
        .emoji {
            font-size: 1.2em;
            margin-right: 0.2em;
        }
        .highlight-box {
            background: #f0f7fe;
            border-radius: 16px;
            padding: 1.5rem 2rem;
            margin: 1.8rem 0;
            border-left: 6px solid #0066c0;
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .tip-box {
            background: #e6f4ea;
            border-radius: 16px;
            padding: 1.5rem 2rem;
            margin: 1.8rem 0;
            border-left: 6px solid #2e7d32;
        }
        .warning-box {
            background: #fff3e0;
            border-radius: 16px;
            padding: 1.5rem 2rem;
            margin: 1.8rem 0;
            border-left: 6px solid #e65100;
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
            gap: 1.2rem;
            margin: 1.5rem 0;
        }
        .stat-card {
            background: #f5f7fa;
            border-radius: 16px;
            padding: 1.2rem 1rem;
            text-align: center;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .stat-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
        }
        .stat-card .number {
            font-size: 2.2rem;
            font-weight: 800;
            color: #0066c0;
            display: block;
        }
        .stat-card .label {
            font-size: 0.9rem;
            color: #4a6a7a;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }
        .content-img {
            margin: 2rem 0;
            border-radius: 16px;
            box-shadow: 0 6px 30px rgba(0, 0, 0, 0.08);
        }
        .content-img figcaption {
            font-size: 0.9rem;
            color: #4a6a7a;
            text-align: center;
            margin-top: 0.6rem;
            font-style: italic;
        }
        .step-list {
            counter-reset: step;
            list-style: none;
            padding: 0;
            margin: 1.5rem 0;
        }
        .step-list li {
            counter-increment: step;
            padding: 0.8rem 0 0.8rem 3.2rem;
            position: relative;
            margin-bottom: 0.8rem;
            background: #fafbfc;
            border-radius: 12px;
            padding-right: 1.2rem;
            transition: background 0.2s;
        }
        .step-list li:hover {
            background: #eef4f9;
        }
        .step-list li::before {
            content: counter(step);
            position: absolute;
            left: 0.6rem;
            top: 0.8rem;
            width: 2rem;
            height: 2rem;
            background: #0066c0;
            color: #fff;
            font-weight: 700;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 0.9rem;
        }
        .interaction-area {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.5rem 0 2rem;
            padding: 2rem 0;
            border-top: 2px solid #e6edf4;
            border-bottom: 2px solid #e6edf4;
        }
        @media (max-width: 700px) {
            .interaction-area {
                grid-template-columns: 1fr;
                gap: 2rem;
            }
        }
        .comment-section,
        .rating-section {
            background: #f9fafc;
            border-radius: 20px;
            padding: 1.5rem 1.8rem;
        }
        .comment-section h3,
        .rating-section h3 {
            margin-top: 0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .comment-section form,
        .rating-section form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.8rem;
        }
        .comment-section input,
        .comment-section textarea,
        .rating-section input,
        .rating-section select {
            padding: 0.7rem 1rem;
            border: 1px solid #dce5ed;
            border-radius: 12px;
            font-size: 1rem;
            font-family: inherit;
            outline: none;
            transition: border-color 0.2s, box-shadow 0.2s;
            background: #fff;
        }
        .comment-section input:focus,
        .comment-section textarea:focus,
        .rating-section input:focus,
        .rating-section select:focus {
            border-color: #0066c0;
            box-shadow: 0 0 0 3px rgba(0, 102, 192, 0.1);
        }
        .comment-section textarea {
            min-height: 90px;
            resize: vertical;
        }
        .btn {
            background: #0066c0;
            color: #fff;
            border: none;
            padding: 0.7rem 1.8rem;
            border-radius: 60px;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            align-self: flex-start;
        }
        .btn:hover {
            background: #003d7a;
            transform: scale(1.01);
            text-decoration: none;
        }
        .btn-secondary {
            background: #e6edf4;
            color: #1e2a3a;
        }
        .btn-secondary:hover {
            background: #d0dce8;
        }
        .rating-stars {
            display: flex;
            gap: 0.4rem;
            font-size: 1.8rem;
            color: #ffb300;
            cursor: pointer;
            direction: rtl;
        }
        .rating-stars input {
            display: none;
        }
        .rating-stars label {
            cursor: pointer;
            transition: transform 0.15s, color 0.15s;
        }
        .rating-stars label:hover,
        .rating-stars label:hover~label {
            color: #ff8f00;
            transform: scale(1.1);
        }
        .rating-stars input:checked~label {
            color: #ff8f00;
        }
        .styled-table {
            width: 100%;
            border-collapse: collapse;
            margin: 1.8rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.04);
        }
        .styled-table thead {
            background: #0b2b40;
            color: #fff;
        }
        .styled-table th,
        .styled-table td {
            padding: 0.9rem 1.2rem;
            text-align: left;
            border-bottom: 1px solid #e6edf4;
        }
        .styled-table tbody tr:hover {
            background: #f0f5fa;
        }
        .styled-table tbody tr:nth-child(even) {
            background: #fafbfc;
        }
        .site-footer {
            margin-top: 2.5rem;
            padding: 2rem 0 1.5rem;
            border-top: 2px solid #e6edf4;
            font-size: 0.95rem;
        }
        .site-footer .footer-grid {
            display: grid;
            grid-template-columns: 2fr 1fr 1fr;
            gap: 2rem;
        }
        @media (max-width: 700px) {
            .site-footer .footer-grid {
                grid-template-columns: 1fr;
                gap: 1.5rem;
            }
        }
        friend-link {
            display: block;
            background: #f5f7fa;
            border-radius: 16px;
            padding: 1.2rem 1.5rem;
            margin: 1.2rem 0;
            font-weight: 500;
        }
        friend-link a {
            display: inline-block;
            margin: 0.3rem 1rem 0.3rem 0;
        }
        friend-link a::before {
            content: "🔗 ";
            font-size: 0.8rem;
        }
        .copyright {
            text-align: center;
            padding-top: 1.5rem;
            margin-top: 1.5rem;
            border-top: 1px solid #e6edf4;
            color: #4a6a7a;
            font-size: 0.9rem;
        }
        .copyright strong {
            color: #0b2b40;
        }
        .last-updated {
            display: inline-block;
            background: #e6edf4;
            padding: 0.3rem 1rem;
            border-radius: 60px;
            font-size: 0.85rem;
            color: #1e2a3a;
            margin: 1rem 0 0.2rem;
        }
        @media (max-width: 600px) {
            h1 {
                font-size: 1.9rem;
            }
            h2 {
                font-size: 1.5rem;
                padding-left: 0.8rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            .stat-grid {
                grid-template-columns: 1fr 1fr;
            }
            .my-logo {
                font-size: 1.5rem;
            }
        }
        h2[id],
        h3[id] {
            scroll-margin-top: 80px;
        }
        .toc {
            background: #f5f7fa;
            border-radius: 16px;
            padding: 1.5rem 2rem;
            margin: 1.8rem 0;
        }
        .toc ul {
            columns: 2 220px;
            list-style: none;
            padding: 0;
        }
        .toc li {
            padding: 0.3rem 0;
        }
        .toc a {
            font-weight: 500;
        }
        .toc a::before {
            content: "📖 ";
        }
        @media (max-width: 500px) {
            .toc ul {
                columns: 1;
            }
        }
        .inline-icon {
            margin-right: 0.4rem;
            color: #1b6b8a;
        }