*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #f5f7fc;
            color: #1e1e2a;
            line-height: 1.7;
            padding: 0;
            margin: 0;
        }
        a {
            color: #3a4b8c;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #1f2b5c;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a1a2e 0%, #2d2d5e 100%);
            color: #fff;
            padding: 16px 0;
            position: sticky;
            top: 0;
            z-index: 100;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #fff;
            text-decoration: none;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #f7971e, #ffd200);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        .my-logo:hover {
            text-decoration: none;
            opacity: 0.9;
        }
        .my-logo small {
            font-size: 0.7rem;
            display: block;
            -webkit-text-fill-color: #aaa;
            color: #aaa;
            font-weight: 400;
            letter-spacing: 1px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 12px;
            border-radius: 6px;
            transition: background 0.2s;
        }
        .nav-toggle:hover {
            background: rgba(255, 255, 255, 0.1);
        }
        .main-nav {
            display: flex;
            gap: 8px;
            flex-wrap: wrap;
            align-items: center;
        }
        .main-nav a {
            color: #e0e0f0;
            padding: 6px 14px;
            border-radius: 30px;
            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: #fff;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 5px;
        }
        .breadcrumb-wrap {
            background: #eef0f7;
            padding: 10px 0;
            font-size: 0.85rem;
            border-bottom: 1px solid #dde0eb;
        }
        .breadcrumb-wrap ol {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 4px 10px;
        }
        .breadcrumb-wrap li+li::before {
            content: "›";
            margin-right: 10px;
            color: #888;
        }
        .breadcrumb-wrap a {
            color: #3a4b8c;
        }
        .breadcrumb-wrap .current {
            color: #666;
            font-weight: 500;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            margin: 0 0 0.6rem 0;
            line-height: 1.2;
            background: linear-gradient(135deg, #1a1a2e, #3a4b8c);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
        }
        h2 {
            font-size: 1.9rem;
            font-weight: 700;
            margin: 2.4rem 0 1rem 0;
            padding-bottom: 8px;
            border-bottom: 3px solid #e0e4f0;
            color: #1a1a2e;
        }
        h3 {
            font-size: 1.4rem;
            font-weight: 600;
            margin: 1.8rem 0 0.8rem 0;
            color: #2d2d5e;
        }
        h4 {
            font-size: 1.15rem;
            font-weight: 600;
            margin: 1.2rem 0 0.5rem 0;
            color: #3a4b8c;
        }
        p {
            margin-bottom: 1.2rem;
            color: #2c2c3a;
        }
        .lead {
            font-size: 1.2rem;
            color: #444;
            font-weight: 400;
            border-left: 4px solid #f7971e;
            padding-left: 20px;
            margin-bottom: 1.8rem;
        }
        .hero {
            padding: 40px 0 20px;
        }
        .hero-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 40px;
            align-items: center;
        }
        .hero-img-wrap {
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 12px 40px rgba(0, 0, 0, 0.12);
        }
        .hero-img-wrap img {
            width: 100%;
            display: block;
        }
        .content-section {
            background: #fff;
            border-radius: 20px;
            padding: 40px 40px 50px;
            margin: 20px 0 30px;
            box-shadow: 0 4px 24px rgba(0, 0, 0, 0.04);
        }
        .content-section p,
        .content-section li {
            font-size: 1.05rem;
        }
        .content-section ul,
        .content-section ol {
            margin: 0 0 1.4rem 1.8rem;
        }
        .content-section li {
            margin-bottom: 0.5rem;
        }
        .highlight-box {
            background: #f0f4ff;
            border-left: 5px solid #3a4b8c;
            padding: 20px 24px;
            border-radius: 0 12px 12px 0;
            margin: 1.6rem 0;
        }
        .highlight-box strong {
            color: #1a1a2e;
        }
        .emoji-big {
            font-size: 1.4rem;
            margin-right: 6px;
        }
        .featured-img {
            margin: 2rem 0;
            border-radius: 16px;
            overflow: hidden;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
        }
        .featured-img img {
            width: 100%;
        }
        .featured-img figcaption {
            padding: 12px 16px;
            background: #f8f9fe;
            font-size: 0.9rem;
            color: #555;
            font-style: italic;
        }
        .search-box {
            background: #f0f4ff;
            border-radius: 60px;
            padding: 4px 4px 4px 20px;
            display: flex;
            align-items: center;
            max-width: 480px;
            margin: 0 auto 2rem;
            border: 1px solid #dde0eb;
            transition: box-shadow 0.3s;
        }
        .search-box:focus-within {
            box-shadow: 0 0 0 4px rgba(58, 75, 140, 0.15);
            border-color: #3a4b8c;
        }
        .search-box input {
            flex: 1;
            border: none;
            background: transparent;
            padding: 12px 8px;
            font-size: 1rem;
            outline: none;
            color: #1e1e2a;
        }
        .search-box button {
            background: #3a4b8c;
            border: none;
            color: #fff;
            padding: 12px 28px;
            border-radius: 60px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
        }
        .search-box button:hover {
            background: #1f2b5c;
            transform: scale(0.97);
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin: 2rem 0;
        }
        .feedback-card {
            background: #f8f9fe;
            border-radius: 16px;
            padding: 28px 30px;
            border: 1px solid #e8ebf5;
        }
        .feedback-card h3 {
            margin-top: 0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .feedback-card label {
            display: block;
            font-weight: 500;
            margin: 14px 0 4px;
            color: #2d2d5e;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            width: 100%;
            padding: 12px 16px;
            border: 1px solid #dde0eb;
            border-radius: 10px;
            font-size: 1rem;
            font-family: inherit;
            background: #fff;
            transition: border 0.2s;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #3a4b8c;
            outline: none;
            box-shadow: 0 0 0 3px rgba(58, 75, 140, 0.1);
        }
        .feedback-card textarea {
            min-height: 100px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            background: #1a1a2e;
            color: #fff;
            border: none;
            padding: 12px 32px;
            border-radius: 60px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            margin-top: 16px;
            transition: background 0.2s, transform 0.1s;
        }
        .feedback-card .btn-submit:hover {
            background: #3a4b8c;
            transform: scale(0.97);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-end;
            gap: 4px;
            margin: 8px 0 12px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #ccc;
            cursor: pointer;
            transition: color 0.15s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f7971e;
        }
        friend-link {
            display: block;
            padding: 30px 0 10px;
        }
        friend-link h3 {
            margin-bottom: 16px;
            font-size: 1.2rem;
        }
        friend-link .friend-list {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        friend-link .friend-list li a {
            color: #3a4b8c;
            font-weight: 500;
            padding: 4px 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s;
        }
        friend-link .friend-list li a:hover {
            border-bottom-color: #3a4b8c;
            text-decoration: none;
        }
        .site-footer {
            background: #1a1a2e;
            color: #bbb;
            padding: 36px 0 24px;
            margin-top: 40px;
            font-size: 0.9rem;
        }
        .site-footer .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .site-footer a {
            color: #bbb;
        }
        .site-footer a:hover {
            color: #fff;
        }
        .site-footer .copyright {
            font-size: 0.85rem;
            color: #888;
        }
        .schema-hidden {
            display: none;
        }
        .last-updated {
            display: inline-block;
            background: #eef0f7;
            padding: 4px 16px;
            border-radius: 30px;
            font-size: 0.85rem;
            color: #555;
            margin-bottom: 1.6rem;
        }
        .last-updated i {
            margin-right: 6px;
        }
        .toc {
            background: #f8f9fe;
            border-radius: 16px;
            padding: 24px 30px;
            margin: 1.6rem 0 2.4rem;
            border: 1px solid #e8ebf5;
        }
        .toc h3 {
            margin-top: 0;
        }
        .toc ul {
            list-style: none;
            padding: 0;
            margin: 0;
            columns: 2;
            column-gap: 30px;
        }
        .toc li {
            margin-bottom: 6px;
            break-inside: avoid;
        }
        .toc a {
            display: inline-block;
            padding: 4px 0;
        }
        .toc a::before {
            content: "▸ ";
            color: #f7971e;
        }
        @media (max-width: 900px) {
            .hero-grid {
                grid-template-columns: 1fr;
                gap: 24px;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
            .toc ul {
                columns: 1;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            .content-section {
                padding: 24px 18px 30px;
            }
        }
        @media (max-width: 700px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                padding: 16px 0 8px;
                gap: 4px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 16px;
                border-radius: 8px;
            }
            .header-inner {
                align-items: center;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .breadcrumb-wrap ol {
                font-size: 0.8rem;
                gap: 2px 6px;
            }
            .search-box {
                max-width: 100%;
                flex-direction: column;
                border-radius: 20px;
                padding: 12px 16px;
                gap: 10px;
            }
            .search-box input {
                width: 100%;
                padding: 8px 4px;
            }
            .search-box button {
                width: 100%;
                text-align: center;
            }
            .star-rating label {
                font-size: 1.5rem;
            }
            .site-footer .footer-inner {
                flex-direction: column;
                text-align: center;
            }
            .content-section ul,
            .content-section ol {
                margin-left: 1.2rem;
            }
        }
        @media (max-width: 480px) {
            h1 {
                font-size: 1.6rem;
            }
            h2 {
                font-size: 1.3rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .container {
                padding: 0 12px;
            }
            .content-section {
                padding: 18px 12px 24px;
            }
            .feedback-card {
                padding: 18px 16px;
            }
        }
        .skip-link {
            position: absolute;
            top: -100px;
            left: 0;
            background: #1a1a2e;
            color: #fff;
            padding: 8px 20px;
            z-index: 999;
        }
        .skip-link:focus {
            top: 0;
        }
        :focus-visible {
            outline: 3px solid #3a4b8c;
            outline-offset: 2px;
        }
        .anchor-offset {
            scroll-margin-top: 90px;
        }