*,
        *::before,
        *::after {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
            background: #f5f7fa;
            color: #1e293b;
            line-height: 1.7;
            padding: 0 1rem;
        }
        a {
            color: #1d4ed8;
            text-decoration: none;
            transition: color 0.2s;
        }
        a:hover {
            color: #0f3a9e;
            text-decoration: underline;
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: 12px;
        }
        ul,
        ol {
            padding-left: 1.5rem;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            background: #ffffff;
            border-radius: 24px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.06);
            padding: 1.5rem 2rem 2rem;
            margin-top: 1.5rem;
            margin-bottom: 2rem;
        }
        @media (max-width: 640px) {
            body {
                padding: 0 0.5rem;
            }
            .container {
                padding: 1rem 1rem 1.5rem;
                border-radius: 16px;
                margin-top: 0.75rem;
                margin-bottom: 1rem;
            }
        }
        .site-header {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            justify-content: space-between;
            padding-bottom: 1rem;
            border-bottom: 2px solid #e9edf2;
            margin-bottom: 1.25rem;
            position: relative;
        }
        .my-logo {
            font-size: 1.8rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #1e3a5f, #0f2b4a);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }
        .my-logo i {
            -webkit-text-fill-color: #1d4ed8;
            font-size: 2rem;
        }
        .my-logo span {
            font-size: 0.75rem;
            font-weight: 400;
            -webkit-text-fill-color: #64748b;
            letter-spacing: 0.3px;
            margin-left: 0.2rem;
        }
        .my-logo a {
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.4rem;
            color: inherit;
        }
        .my-logo a:hover {
            text-decoration: none;
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            font-size: 1.8rem;
            color: #1e293b;
            cursor: pointer;
            padding: 0.25rem 0.5rem;
            border-radius: 8px;
            transition: background 0.2s;
        }
        .hamburger:hover {
            background: #f1f5f9;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .main-nav {
            display: flex;
            flex-wrap: wrap;
            gap: 0.25rem 1.2rem;
            align-items: center;
            transition: max-height 0.35s ease, opacity 0.25s ease;
        }
        .main-nav a {
            font-weight: 500;
            font-size: 0.95rem;
            padding: 0.3rem 0;
            color: #334155;
            border-bottom: 2px solid transparent;
            transition: border-color 0.2s, color 0.2s;
        }
        .main-nav a:hover {
            border-bottom-color: #1d4ed8;
            color: #1e293b;
            text-decoration: none;
        }
        .main-nav a i {
            margin-right: 0.3rem;
            font-size: 0.85rem;
            color: #1d4ed8;
        }
        @media (max-width: 768px) {
            .main-nav {
                max-height: 0;
                opacity: 0;
                overflow: hidden;
                width: 100%;
                flex-direction: column;
                gap: 0.5rem;
                padding-top: 0.5rem;
                padding-bottom: 0.25rem;
                border-top: 1px solid #e9edf2;
                margin-top: 0.75rem;
            }
            .main-nav.open {
                max-height: 600px;
                opacity: 1;
            }
            .main-nav a {
                padding: 0.5rem 0.25rem;
                border-bottom: none;
                border-left: 3px solid transparent;
                padding-left: 0.5rem;
            }
            .main-nav a:hover {
                border-left-color: #1d4ed8;
                border-bottom-color: transparent;
            }
        }
        .breadcrumb {
            display: flex;
            flex-wrap: wrap;
            align-items: center;
            gap: 0.4rem 0.6rem;
            font-size: 0.85rem;
            color: #64748b;
            padding: 0.5rem 0 0.75rem;
            border-bottom: 1px solid #f1f5f9;
            margin-bottom: 1.25rem;
        }
        .breadcrumb a {
            color: #1d4ed8;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        .breadcrumb i {
            font-size: 0.7rem;
            color: #94a3b8;
        }
        .breadcrumb .current {
            color: #334155;
            font-weight: 500;
        }
        h1 {
            font-size: 2.4rem;
            font-weight: 800;
            line-height: 1.25;
            margin-bottom: 0.75rem;
            color: #0f172a;
            letter-spacing: -0.5px;
        }
        h2 {
            font-size: 1.8rem;
            font-weight: 700;
            margin-top: 2.5rem;
            margin-bottom: 0.75rem;
            color: #0f172a;
            border-left: 5px solid #1d4ed8;
            padding-left: 1rem;
        }
        h3 {
            font-size: 1.35rem;
            font-weight: 600;
            margin-top: 1.75rem;
            margin-bottom: 0.5rem;
            color: #1e293b;
        }
        h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-top: 1.25rem;
            margin-bottom: 0.35rem;
            color: #334155;
        }
        p {
            margin-bottom: 1.1rem;
            color: #334155;
        }
        .lead {
            font-size: 1.15rem;
            color: #1e293b;
            font-weight: 400;
            border-left: 4px solid #1d4ed8;
            padding-left: 1.2rem;
            margin-bottom: 1.5rem;
        }
        .update-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            background: #eef2ff;
            color: #1d4ed8;
            padding: 0.4rem 1rem;
            border-radius: 40px;
            font-size: 0.85rem;
            font-weight: 500;
            margin-bottom: 1.25rem;
        }
        .update-badge i {
            font-size: 0.9rem;
        }
        .feature-img {
            margin: 1.5rem 0 1.75rem;
            border-radius: 16px;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
        }
        .highlight-box {
            background: #f8fafc;
            border-left: 6px solid #1d4ed8;
            padding: 1.25rem 1.5rem;
            border-radius: 0 12px 12px 0;
            margin: 1.5rem 0;
        }
        .highlight-box p:last-child {
            margin-bottom: 0;
        }
        .stat-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        .stat-card {
            background: #f1f5f9;
            border-radius: 12px;
            padding: 1rem 1.25rem;
            text-align: center;
            transition: transform 0.2s, box-shadow 0.2s;
        }
        .stat-card:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 24px rgba(0, 0, 0, 0.06);
        }
        .stat-card .num {
            font-size: 2rem;
            font-weight: 800;
            color: #1d4ed8;
            display: block;
        }
        .stat-card .label {
            font-size: 0.85rem;
            color: #475569;
            margin-top: 0.2rem;
        }
        .inline-list {
            list-style: none;
            padding-left: 0;
            display: flex;
            flex-wrap: wrap;
            gap: 0.75rem 1.5rem;
            margin: 1rem 0 1.25rem;
        }
        .inline-list li {
            display: flex;
            align-items: center;
            gap: 0.4rem;
            font-size: 0.95rem;
        }
        .inline-list li i {
            color: #1d4ed8;
            font-size: 0.85rem;
        }
        .table-wrap {
            overflow-x: auto;
            margin: 1.5rem 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
            min-width: 500px;
        }
        th,
        td {
            padding: 0.75rem 1rem;
            text-align: left;
            border-bottom: 1px solid #e9edf2;
        }
        th {
            background: #f1f5f9;
            font-weight: 600;
            color: #0f172a;
        }
        tr:hover td {
            background: #f8fafc;
        }
        .interact-section {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 2.5rem 0 1.5rem;
            padding: 1.5rem 0;
            border-top: 2px solid #e9edf2;
            border-bottom: 2px solid #e9edf2;
        }
        @media (max-width: 700px) {
            .interact-section {
                grid-template-columns: 1fr;
                gap: 1.25rem;
            }
        }
        .interact-card {
            background: #f8fafc;
            border-radius: 16px;
            padding: 1.5rem;
        }
        .interact-card h3 {
            margin-top: 0;
            font-size: 1.2rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .interact-card h3 i {
            color: #1d4ed8;
        }
        .interact-card form {
            display: flex;
            flex-direction: column;
            gap: 0.75rem;
            margin-top: 0.75rem;
        }
        .interact-card input,
        .interact-card textarea,
        .interact-card select {
            padding: 0.6rem 0.9rem;
            border: 1px solid #d1d9e6;
            border-radius: 8px;
            font-family: inherit;
            font-size: 0.95rem;
            background: #fff;
            transition: border 0.2s;
        }
        .interact-card input:focus,
        .interact-card textarea:focus,
        .interact-card select:focus {
            outline: none;
            border-color: #1d4ed8;
            box-shadow: 0 0 0 3px rgba(29, 78, 216, 0.1);
        }
        .interact-card textarea {
            resize: vertical;
            min-height: 70px;
        }
        .interact-card .btn {
            background: #1d4ed8;
            color: #fff;
            border: none;
            padding: 0.6rem 1.4rem;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background 0.2s, transform 0.15s;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            justify-content: center;
            width: fit-content;
        }
        .interact-card .btn:hover {
            background: #0f3a9e;
            transform: translateY(-1px);
        }
        .interact-card .btn i {
            font-size: 0.9rem;
        }
        .star-rate {
            display: flex;
            gap: 0.25rem;
            font-size: 1.4rem;
            color: #f59e0b;
            cursor: pointer;
            direction: rtl;
        }
        .star-rate input {
            display: none;
        }
        .star-rate label {
            cursor: pointer;
            transition: transform 0.15s;
        }
        .star-rate label:hover,
        .star-rate label:hover~label,
        .star-rate input:checked~label {
            transform: scale(1.1);
            color: #f59e0b;
        }
        .star-rate label i {
            transition: color 0.15s;
        }
        .star-rate label:hover i,
        .star-rate label:hover~label i,
        .star-rate input:checked~label i {
            font-weight: 900;
            color: #f59e0b;
        }
        .site-footer {
            margin-top: 2.5rem;
            padding-top: 1.5rem;
            border-top: 2px solid #e9edf2;
        }
        friend-link {
            display: block;
            padding: 1rem 0 0.75rem;
            font-size: 0.95rem;
        }
        friend-link a {
            display: inline-block;
            margin: 0.25rem 1.2rem 0.25rem 0;
            padding: 0.2rem 0;
            color: #1d4ed8;
        }
        friend-link a:hover {
            text-decoration: underline;
        }
        .copyright {
            font-size: 0.85rem;
            color: #64748b;
            padding: 1rem 0 0.5rem;
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 0.5rem;
        }
        .copyright i {
            margin-right: 0.3rem;
        }
        @media (max-width: 480px) {
            .copyright {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 640px) {
            h1 {
                font-size: 1.7rem;
            }
            h2 {
                font-size: 1.4rem;
                padding-left: 0.75rem;
            }
            h3 {
                font-size: 1.15rem;
            }
            .lead {
                font-size: 1rem;
                padding-left: 0.75rem;
            }
            .my-logo {
                font-size: 1.4rem;
            }
            .my-logo i {
                font-size: 1.5rem;
            }
            .stat-grid {
                grid-template-columns: repeat(2, 1fr);
                gap: 0.75rem;
            }
            .stat-card .num {
                font-size: 1.6rem;
            }
            .interact-card {
                padding: 1rem;
            }
            .container {
                padding: 0.75rem 0.75rem 1rem;
            }
        }
        @media (min-width: 769px) {
            .main-nav {
                display: flex !important;
                max-height: none !important;
                opacity: 1 !important;
                overflow: visible !important;
                border-top: none !important;
                padding-top: 0 !important;
                margin-top: 0 !important;
                width: auto !important;
                flex-direction: row !important;
            }
        }
        .tag {
            display: inline-block;
            background: #eef2ff;
            color: #1d4ed8;
            font-size: 0.75rem;
            padding: 0.2rem 0.7rem;
            border-radius: 40px;
            font-weight: 500;
            margin-right: 0.4rem;
            margin-bottom: 0.3rem;
        }
        .quote {
            font-style: italic;
            border-left: 4px solid #f59e0b;
            padding-left: 1.2rem;
            color: #475569;
            margin: 1.25rem 0;
        }
        .two-col {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        @media (max-width: 640px) {
            .two-col {
                grid-template-columns: 1fr;
                gap: 1rem;
            }
        }
        .smooth-list {
            list-style: none;
            padding-left: 0;
        }
        .smooth-list li {
            padding: 0.3rem 0;
            display: flex;
            align-items: baseline;
            gap: 0.5rem;
        }
        .smooth-list li i {
            color: #1d4ed8;
            font-size: 0.8rem;
            min-width: 1rem;
        }