*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
            background: #f5f7fa;
            color: #1e2a3a;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #0066cc;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #004499;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        h1,
        h2,
        h3,
        h4,
        h5,
        h6 {
            line-height: 1.25;
            margin-top: 1.5rem;
            margin-bottom: 0.75rem;
            color: #0b1a2a;
        }
        h1 {
            font-size: 2.2rem;
            margin-top: 0.5rem;
        }
        h2 {
            font-size: 1.75rem;
            border-bottom: 3px solid #e0a800;
            padding-bottom: 0.3rem;
        }
        h3 {
            font-size: 1.35rem;
            margin-top: 1.75rem;
        }
        h4 {
            font-size: 1.1rem;
            margin-top: 1.25rem;
            font-weight: 600;
        }
        p {
            margin-bottom: 1.25rem;
        }
        .container {
            max-width: 1120px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 18px 18px 0 0;
            box-shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            padding: 1.2rem 1.8rem 2.5rem;
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding: 0.75rem 0 0.5rem;
            border-bottom: 2px solid #eef0f3;
            position: relative;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #0b1a2a, #2a4a6a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: inline-block;
            text-decoration: none !important;
        }
        .my-logo:hover {
            opacity: 0.85;
            text-decoration: none !important;
        }
        .my-logo small {
            font-size: 0.8rem;
            font-weight: 400;
            -webkit-text-fill-color: #5a6a7a;
            color: #5a6a7a;
            letter-spacing: 0.3px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: 2px solid #1e2a3a;
            border-radius: 8px;
            padding: 0.4rem 0.7rem;
            font-size: 1.5rem;
            cursor: pointer;
            color: #1e2a3a;
            transition: 0.2s;
        }
        .nav-toggle:hover {
            background: #eef0f3;
        }
        .primary-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.8rem;
            align-items: center;
        }
        .primary-nav a {
            font-weight: 500;
            padding: 0.3rem 0.7rem;
            border-radius: 30px;
            font-size: 0.95rem;
            color: #1e2a3a;
            transition: background 0.2s, color 0.2s;
        }
        .primary-nav a:hover {
            background: #e0a800;
            color: #0b1a2a;
            text-decoration: none;
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            gap: 0.3rem 0.6rem;
            font-size: 0.85rem;
            padding: 0.6rem 0 0.8rem;
            color: #5a6a7a;
            border-bottom: 1px solid #eef0f3;
            margin-bottom: 1.2rem;
        }
        .breadcrumb a {
            color: #0066cc;
        }
        .breadcrumb span.sep {
            color: #aab;
        }
        .search-block {
            background: #f0f3f8;
            border-radius: 40px;
            padding: 0.1rem 0.1rem 0.1rem 1.2rem;
            display: flex;
            align-items: center;
            max-width: 420px;
            margin: 1.2rem 0 1.8rem;
            border: 1px solid #dde1e8;
            transition: 0.2s;
        }
        .search-block:focus-within {
            border-color: #e0a800;
            box-shadow: 0 0 0 3px rgba(224, 168, 0, 0.15);
        }
        .search-block i {
            color: #7a8a9a;
            font-size: 1rem;
        }
        .search-block input {
            border: none;
            background: transparent;
            padding: 0.7rem 0.8rem;
            flex: 1;
            font-size: 0.95rem;
            outline: none;
            min-width: 0;
        }
        .search-block button {
            background: #e0a800;
            border: none;
            border-radius: 40px;
            padding: 0.55rem 1.4rem;
            font-weight: 600;
            color: #0b1a2a;
            cursor: pointer;
            transition: 0.2s;
            font-size: 0.9rem;
            white-space: nowrap;
        }
        .search-block button:hover {
            background: #c89400;
        }
        .feature-img {
            border-radius: 18px;
            margin: 1.5rem 0 2rem;
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
        }
        .feature-img img {
            border-radius: 18px;
            width: 100%;
        }
        .feature-img figcaption {
            font-size: 0.85rem;
            color: #5a6a7a;
            text-align: center;
            padding: 0.6rem 0 0.2rem;
            font-style: italic;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.8rem;
            margin: 2.2rem 0 1.2rem;
            padding: 1.8rem 1.8rem 2rem;
            background: #f8faff;
            border-radius: 24px;
            border: 1px solid #e6ecf4;
        }
        .feedback-grid h3 {
            margin-top: 0;
            font-size: 1.3rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            border-bottom: 2px solid #dde4ee;
            padding-bottom: 0.5rem;
        }
        .feedback-grid form {
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
        }
        .feedback-grid label {
            font-weight: 600;
            font-size: 0.95rem;
        }
        .feedback-grid input,
        .feedback-grid textarea,
        .feedback-grid select {
            padding: 0.6rem 0.9rem;
            border-radius: 12px;
            border: 1px solid #ccd7e6;
            font-size: 0.95rem;
            font-family: inherit;
            background: #fff;
            transition: 0.2s;
        }
        .feedback-grid input:focus,
        .feedback-grid textarea:focus,
        .feedback-grid select:focus {
            border-color: #e0a800;
            outline: none;
            box-shadow: 0 0 0 3px rgba(224, 168, 0, 0.1);
        }
        .feedback-grid textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-grid .btn-submit {
            background: #1e2a3a;
            color: #fff;
            border: none;
            padding: 0.65rem 1.2rem;
            border-radius: 40px;
            font-weight: 600;
            cursor: pointer;
            transition: 0.2s;
            font-size: 0.95rem;
            align-self: flex-start;
        }
        .feedback-grid .btn-submit:hover {
            background: #0b1a2a;
            transform: scale(1.01);
        }
        .rating-group {
            display: flex;
            gap: 0.6rem;
            align-items: center;
            flex-wrap: wrap;
        }
        .rating-group select {
            flex: 1;
            min-width: 100px;
        }
        .star-demo {
            color: #e0a800;
            letter-spacing: 2px;
        }
        .site-footer {
            max-width: 1120px;
            margin: 0 auto 1.5rem;
            background: #0b1a2a;
            color: #ccdae8;
            border-radius: 0 0 18px 18px;
            padding: 1.8rem 2rem 1.5rem;
        }
        .site-footer a {
            color: #f0c14a;
        }
        .site-footer a:hover {
            color: #ffd966;
        }
        friend-link {
            display: block;
            margin: 0.8rem 0 1.2rem;
            font-size: 0.95rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.2rem 0.8rem 0.2rem 0;
            padding: 0.25rem 0.8rem;
            background: rgba(255, 255, 255, 0.06);
            border-radius: 30px;
            border: 1px solid rgba(255, 255, 255, 0.1);
            transition: 0.2s;
        }
        friend-link a:hover {
            background: rgba(224, 168, 0, 0.2);
            border-color: #e0a800;
            text-decoration: none;
        }
        .copyright {
            border-top: 1px solid #1e3450;
            padding-top: 1.2rem;
            margin-top: 0.8rem;
            font-size: 0.85rem;
            text-align: center;
            color: #8a9bb0;
        }
        @media (max-width: 820px) {
            .container {
                padding: 0.8rem 1rem 2rem;
            }
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.4rem;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
                gap: 1.8rem;
                padding: 1.2rem;
            }
            .site-footer {
                padding: 1.2rem 1rem;
            }
            .primary-nav {
                display: none;
                width: 100%;
                flex-direction: column;
                padding: 1rem 0 0.5rem;
                gap: 0.2rem;
            }
            .primary-nav.show {
                display: flex;
            }
            .nav-toggle {
                display: inline-block;
            }
            .site-header {
                flex-wrap: wrap;
            }
            .my-logo {
                font-size: 1.5rem;
            }
            .search-block {
                max-width: 100%;
                margin: 0.8rem 0 1.2rem;
            }
        }
        @media (max-width: 480px) {
            body {
                padding: 0 0.4rem;
            }
            .container {
                padding: 0.5rem 0.8rem 1.5rem;
                border-radius: 12px;
            }
            h1 {
                font-size: 1.4rem;
            }
            h2 {
                font-size: 1.2rem;
            }
            .breadcrumb {
                font-size: 0.75rem;
                gap: 0.2rem;
            }
            .feedback-grid input,
            .feedback-grid textarea,
            .feedback-grid select {
                font-size: 0.9rem;
            }
            .star-demo {
                font-size: 0.9rem;
            }
            friend-link a {
                display: block;
                margin: 0.3rem 0;
            }
        }
        .mt-1 {
            margin-top: 1rem;
        }
        .mb-1 {
            margin-bottom: 1rem;
        }
        .text-highlight {
            background: linear-gradient(to right, #fef6e0, #fef0c8);
            padding: 0.1rem 0.4rem;
            border-radius: 6px;
            font-weight: 600;
        }
        .btn-top {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #e0a800;
            color: #0b1a2a;
            border: none;
            border-radius: 50%;
            width: 48px;
            height: 48px;
            font-size: 1.3rem;
            cursor: pointer;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.15);
            transition: 0.2s;
            z-index: 99;
            display: flex;
            align-items: center;
            justify-content: center;
        }
        .btn-top:hover {
            background: #c89400;
            transform: translateY(-3px);
        }
        @media (max-width: 600px) {
            .btn-top {
                bottom: 1rem;
                right: 1rem;
                width: 42px;
                height: 42px;
                font-size: 1.1rem;
            }
        }
        blockquote {
            border-left: 4px solid #e0a800;
            padding: 0.6rem 1.2rem;
            margin: 1.5rem 0;
            background: #fafafc;
            border-radius: 0 12px 12px 0;
            font-style: italic;
            color: #2a3a4a;
        }
        blockquote strong {
            font-style: normal;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .stat-card {
            background: #f0f4fc;
            border-radius: 16px;
            padding: 1rem 0.8rem;
            text-align: center;
            border: 1px solid #dde6f0;
        }
        .stat-card .num {
            font-size: 2rem;
            font-weight: 800;
            color: #0b1a2a;
        }
        .stat-card .label {
            font-size: 0.85rem;
            color: #4a5a6a;
        }
        .pro-tip {
            background: #eaf6ea;
            border-radius: 14px;
            padding: 1rem 1.4rem;
            border-left: 5px solid #2a8a3a;
            margin: 1.2rem 0;
        }
        .pro-tip i {
            color: #2a8a3a;
            margin-right: 0.4rem;
        }