*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background: #f4f7fc;
            color: #1a2634;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #0066c0;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #003d6b;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.06);
            border-radius: 24px;
            padding: 1.5rem 2rem 2rem;
            margin-top: 1.5rem;
            margin-bottom: 1.5rem;
        }
        h1 {
            font-size: 2.6rem;
            font-weight: 800;
            color: #0a1e2f;
            margin-bottom: 0.75rem;
            letter-spacing: -0.02em;
            line-height: 1.2;
        }
        h2 {
            font-size: 2rem;
            font-weight: 700;
            color: #0f2a3f;
            margin-top: 2.8rem;
            margin-bottom: 1rem;
            border-left: 5px solid #f5a623;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.5rem;
            font-weight: 600;
            color: #1a3a52;
            margin-top: 2rem;
            margin-bottom: 0.75rem;
        }
        h4 {
            font-size: 1.2rem;
            font-weight: 600;
            color: #2a4a62;
            margin-top: 1.5rem;
            margin-bottom: 0.5rem;
        }
        p {
            margin-bottom: 1.2rem;
            font-size: 1.05rem;
            color: #2c3e4f;
        }
        .lead {
            font-size: 1.25rem;
            font-weight: 400;
            color: #1f3a4e;
            background: #eef4fa;
            padding: 1.2rem 1.8rem;
            border-radius: 16px;
            margin-bottom: 2rem;
            border-left: 6px solid #f5a623;
        }
        small,
        .text-muted {
            color: #5e7a93;
            font-size: 0.9rem;
        }
        .update-badge {
            display: inline-block;
            background: #e8edf3;
            padding: 0.25rem 1rem;
            border-radius: 50px;
            font-size: 0.85rem;
            color: #1f4a6e;
            margin-bottom: 1.2rem;
        }
        .update-badge i {
            margin-right: 6px;
        }
        .header-wrapper {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0.8rem 0 1.2rem;
            border-bottom: 2px solid #e6edf5;
            position: relative;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            color: #0a1e2f;
            letter-spacing: -0.03em;
        }
        .my-logo a {
            color: inherit;
            text-decoration: none;
        }
        .my-logo a:hover {
            color: #f5a623;
            text-decoration: none;
        }
        .my-logo i {
            color: #f5a623;
            margin-right: 6px;
        }
        .nav-list {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            gap: 0.2rem 0.8rem;
            align-items: center;
        }
        .nav-list li a {
            padding: 0.4rem 0.8rem;
            border-radius: 8px;
            font-weight: 500;
            color: #1f3a4e;
            transition: background 0.2s, color 0.2s;
            font-size: 0.95rem;
        }
        .nav-list li a:hover {
            background: #f5a623;
            color: #0a1e2f;
            text-decoration: none;
        }
        .nav-list li a.active {
            background: #0a1e2f;
            color: #fff;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #0a1e2f;
            cursor: pointer;
            padding: 0.2rem 0.4rem;
        }
        .nav-mobile {
            display: none;
            width: 100%;
            margin-top: 1rem;
            background: #f8faff;
            border-radius: 16px;
            padding: 1rem;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.05);
        }
        .nav-mobile.open {
            display: block;
        }
        .nav-mobile ul {
            list-style: none;
        }
        .nav-mobile ul li {
            padding: 0.5rem 0;
            border-bottom: 1px solid #e6edf5;
        }
        .nav-mobile ul li:last-child {
            border-bottom: none;
        }
        .nav-mobile ul li a {
            font-weight: 500;
            display: block;
            padding: 0.3rem 0;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            list-style: none;
            padding: 0.8rem 0 0.4rem;
            font-size: 0.9rem;
            color: #5e7a93;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin: 0 0.6rem;
            color: #aabbcc;
        }
        .breadcrumb a {
            color: #0066c0;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb .current {
            color: #1f3a4e;
            font-weight: 500;
        }
        .search-box {
            background: #f0f5fb;
            border-radius: 60px;
            padding: 0.3rem 0.3rem 0.3rem 1.5rem;
            display: flex;
            align-items: center;
            max-width: 480px;
            margin: 1.8rem 0 2.2rem;
            border: 1px solid #dce6f0;
            transition: box-shadow 0.2s;
        }
        .search-box:focus-within {
            box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.25);
            border-color: #f5a623;
        }
        .search-box input {
            flex: 1;
            border: none;
            background: transparent;
            padding: 0.8rem 0;
            font-size: 1rem;
            outline: none;
            color: #1a2634;
        }
        .search-box input::placeholder {
            color: #8aa0b5;
        }
        .search-box button {
            background: #f5a623;
            border: none;
            padding: 0.7rem 1.6rem;
            border-radius: 60px;
            font-weight: 600;
            color: #0a1e2f;
            cursor: pointer;
            transition: background 0.2s, transform 0.1s;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .search-box button:hover {
            background: #e09515;
            transform: scale(0.98);
        }
        .feature-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
            gap: 1.8rem;
            margin: 2rem 0;
        }
        .feature-card {
            background: #f8faff;
            border-radius: 20px;
            padding: 1.8rem 1.5rem;
            transition: transform 0.2s, box-shadow 0.2s;
            border: 1px solid #e6edf5;
        }
        .feature-card:hover {
            transform: translateY(-4px);
            box-shadow: 0 12px 28px rgba(0, 0, 0, 0.06);
        }
        .feature-card i {
            font-size: 2.4rem;
            color: #f5a623;
            margin-bottom: 0.8rem;
        }
        .feature-card h3 {
            margin-top: 0.2rem;
            font-size: 1.25rem;
        }
        .insight-block {
            background: #f2f7fe;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            margin: 2rem 0;
            border-left: 6px solid #f5a623;
        }
        .stat-row {
            display: flex;
            flex-wrap: wrap;
            gap: 1.5rem;
            justify-content: space-around;
            background: #0a1e2f;
            color: #fff;
            border-radius: 20px;
            padding: 2rem 1.5rem;
            margin: 2rem 0;
        }
        .stat-item {
            text-align: center;
            flex: 1 1 120px;
        }
        .stat-item .num {
            font-size: 2.6rem;
            font-weight: 800;
            color: #f5a623;
            display: block;
            line-height: 1.2;
        }
        .stat-item .label {
            font-size: 0.95rem;
            opacity: 0.85;
        }
        .feedback-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 2rem;
            margin: 2.5rem 0;
        }
        .feedback-card {
            background: #f8faff;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            border: 1px solid #e6edf5;
        }
        .feedback-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        .feedback-card form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            margin-top: 0.8rem;
        }
        .feedback-card input,
        .feedback-card textarea,
        .feedback-card select {
            padding: 0.8rem 1rem;
            border: 1px solid #dce6f0;
            border-radius: 12px;
            font-size: 0.95rem;
            background: #fff;
            transition: border-color 0.2s;
            font-family: inherit;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus,
        .feedback-card select:focus {
            border-color: #f5a623;
            outline: none;
            box-shadow: 0 0 0 3px rgba(245, 166, 35, 0.15);
        }
        .feedback-card textarea {
            min-height: 90px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            background: #0a1e2f;
            color: #fff;
            border: none;
            padding: 0.8rem 1.5rem;
            border-radius: 60px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
            align-self: flex-start;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .feedback-card .btn-submit:hover {
            background: #1a3a52;
        }
        .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: 1.8rem;
            color: #d0d8e0;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #f5a623;
        }
        .hero-img-wrap {
            margin: 2rem 0;
            border-radius: 20px;
            overflow: hidden;
            background: #eef4fa;
            position: relative;
        }
        .hero-img-wrap img {
            width: 100%;
            height: auto;
            object-fit: cover;
            display: block;
        }
        .hero-img-wrap .img-caption {
            padding: 1rem 1.5rem;
            font-size: 0.9rem;
            color: #3a5a72;
            background: #f8faff;
            border-top: 1px solid #e6edf5;
        }
        friend-link {
            display: block;
            background: #f0f5fb;
            border-radius: 20px;
            padding: 1.8rem 2rem;
            margin: 2.5rem 0 1.5rem;
            border: 1px solid #e0e8f2;
        }
        friend-link h3 {
            margin-top: 0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 0.6rem;
        }
        friend-link ul {
            list-style: none;
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem 1.5rem;
            margin-top: 1rem;
        }
        friend-link ul li a {
            font-weight: 500;
            padding: 0.2rem 0;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s;
        }
        friend-link ul li a:hover {
            border-bottom-color: #f5a623;
            text-decoration: none;
        }
        .site-footer {
            border-top: 2px solid #e6edf5;
            padding: 1.8rem 0 0.8rem;
            margin-top: 2rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 1rem;
            font-size: 0.9rem;
            color: #3a5a72;
        }
        .site-footer .copyright {
            font-weight: 400;
        }
        .site-footer .copyright i {
            color: #f5a623;
        }
        .schema-hidden {
            display: none;
        }
        @media (max-width: 820px) {
            .container {
                padding: 1rem 1.2rem;
                border-radius: 16px;
                margin-top: 0.8rem;
                margin-bottom: 0.8rem;
            }
            h1 {
                font-size: 2rem;
            }
            h2 {
                font-size: 1.6rem;
            }
            h3 {
                font-size: 1.25rem;
            }
            .feedback-section {
                grid-template-columns: 1fr;
            }
            .header-wrapper .nav-list {
                display: none;
            }
            .hamburger {
                display: inline-block;
            }
            .stat-row {
                flex-direction: column;
                align-items: center;
                padding: 1.5rem 1rem;
            }
            .stat-item .num {
                font-size: 2rem;
            }
            .search-box {
                max-width: 100%;
                flex-wrap: wrap;
                border-radius: 20px;
                padding: 0.5rem 0.5rem 0.5rem 1rem;
            }
            .search-box button {
                margin-top: 0.3rem;
                width: 100%;
                justify-content: center;
            }
            .lead {
                font-size: 1.1rem;
                padding: 1rem 1.2rem;
            }
            .my-logo {
                font-size: 1.4rem;
            }
        }
        @media (max-width: 480px) {
            body {
                padding: 0 0.4rem;
            }
            .container {
                padding: 0.8rem 0.8rem;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.35rem;
                padding-left: 0.6rem;
            }
            .feature-grid {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
            .feedback-card {
                padding: 1.2rem;
            }
            .hero-img-wrap .img-caption {
                font-size: 0.8rem;
                padding: 0.6rem 1rem;
            }
            .site-footer {
                flex-direction: column;
                text-align: center;
            }
            friend-link ul {
                flex-direction: column;
                gap: 0.4rem;
            }
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .text-highlight {
            background: linear-gradient(to right, #f5a62333, #f5a62311);
            padding: 0.1rem 0.4rem;
            border-radius: 6px;
            font-weight: 600;
        }
        .emoji-lg {
            font-size: 1.6rem;
            vertical-align: middle;
        }
        hr {
            border: none;
            border-top: 2px dashed #dce6f0;
            margin: 2rem 0;
        }
        .toc {
            background: #f8faff;
            border-radius: 16px;
            padding: 1.5rem 2rem;
            margin: 1.5rem 0 2rem;
            border: 1px solid #e6edf5;
        }
        .toc ol {
            margin-left: 1.2rem;
            columns: 2 220px;
            column-gap: 2rem;
        }
        .toc ol li {
            margin-bottom: 0.3rem;
        }
        @media (max-width: 500px) {
            .toc ol {
                columns: 1;
            }
        }