*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        :root {
            --primary: #0f1b3d;
            --primary-light: #1a2d6d;
            --accent: #f7931e;
            --accent-light: #ffb347;
            --bg: #f4f6fb;
            --card-bg: #ffffff;
            --text: #1e2a3a;
            --text-light: #4a5a6a;
            --border: #dce1ec;
            --radius: 12px;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.06);
            --shadow-hover: 0 12px 40px rgba(0, 0, 0, 0.12);
            --font: 'Segoe UI', system-ui, -apple-system, sans-serif;
            --transition: 0.25s ease;
        }
        html {
            scroll-behavior: smooth;
            font-size: 16px;
        }
        body {
            font-family: var(--font);
            background: var(--bg);
            color: var(--text);
            line-height: 1.7;
            -webkit-font-smoothing: antialiased;
        }
        a {
            color: var(--primary-light);
            text-decoration: none;
            transition: color var(--transition);
        }
        a:hover {
            color: var(--accent);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
            border-radius: var(--radius);
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: var(--primary);
            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;
            gap: 12px;
        }
        .my-logo {
            font-size: 1.9rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            background: linear-gradient(135deg, #fff, var(--accent-light));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            transition: transform var(--transition);
        }
        .my-logo:hover {
            transform: scale(1.02);
        }
        .my-logo i {
            -webkit-text-fill-color: initial;
            color: var(--accent);
            margin-right: 6px;
        }
        .nav-toggle {
            display: none;
            background: none;
            border: none;
            color: #fff;
            font-size: 1.6rem;
            cursor: pointer;
            padding: 4px 8px;
            border-radius: 6px;
            transition: background var(--transition);
        }
        .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: rgba(255, 255, 255, 0.85);
            padding: 6px 14px;
            border-radius: 8px;
            font-weight: 500;
            font-size: 0.92rem;
            transition: background var(--transition), color var(--transition);
        }
        .main-nav a:hover,
        .main-nav a.active {
            background: rgba(255, 255, 255, 0.12);
            color: #fff;
        }
        .main-nav a i {
            margin-right: 6px;
            font-size: 0.85rem;
        }
        .breadcrumb {
            background: #e8ecf5;
            padding: 10px 0;
            font-size: 0.85rem;
            color: var(--text-light);
        }
        .breadcrumb ol {
            display: flex;
            flex-wrap: wrap;
            gap: 6px 12px;
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .breadcrumb li+li::before {
            content: "›";
            margin-right: 10px;
            color: #999;
        }
        .breadcrumb a {
            color: var(--primary-light);
        }
        .breadcrumb .current {
            color: var(--text-light);
            font-weight: 500;
        }
        .hero {
            background: linear-gradient(135deg, var(--primary) 0%, #1f3a7a 100%);
            color: #fff;
            padding: 60px 0 50px;
            text-align: center;
            position: relative;
            overflow: hidden;
        }
        .hero::after {
            content: "🧩";
            position: absolute;
            right: -40px;
            bottom: -40px;
            font-size: 260px;
            opacity: 0.06;
            pointer-events: none;
            transform: rotate(12deg);
        }
        .hero h1 {
            font-size: 3rem;
            font-weight: 800;
            letter-spacing: -0.5px;
            margin-bottom: 14px;
            line-height: 1.15;
        }
        .hero h1 i {
            color: var(--accent);
        }
        .hero p {
            font-size: 1.2rem;
            max-width: 680px;
            margin: 0 auto 24px;
            opacity: 0.88;
            line-height: 1.6;
        }
        .hero .meta-badge {
            display: inline-flex;
            gap: 20px;
            flex-wrap: wrap;
            justify-content: center;
            font-size: 0.95rem;
            background: rgba(255, 255, 255, 0.08);
            padding: 10px 28px;
            border-radius: 60px;
            backdrop-filter: blur(2px);
        }
        .hero .meta-badge span {
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .hero .meta-badge i {
            color: var(--accent);
        }
        .search-section {
            background: var(--card-bg);
            padding: 28px 0;
            border-bottom: 1px solid var(--border);
            box-shadow: var(--shadow);
        }
        .search-form {
            display: flex;
            max-width: 560px;
            margin: 0 auto;
            border-radius: 60px;
            overflow: hidden;
            box-shadow: 0 2px 12px rgba(0, 0, 0, 0.06);
        }
        .search-form input {
            flex: 1;
            border: none;
            padding: 14px 22px;
            font-size: 1rem;
            background: #f9fafc;
            outline: none;
            font-family: var(--font);
        }
        .search-form button {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 14px 28px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: background var(--transition);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .search-form button:hover {
            background: var(--primary-light);
        }
        .content-wrapper {
            padding: 40px 0 60px;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr 300px;
            gap: 48px;
        }
        .main-article {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 40px 44px;
            box-shadow: var(--shadow);
        }
        .main-article h2 {
            font-size: 2rem;
            font-weight: 700;
            margin: 48px 0 16px;
            color: var(--primary);
            line-height: 1.25;
            border-bottom: 3px solid var(--accent);
            padding-bottom: 8px;
            display: inline-block;
        }
        .main-article h2:first-of-type {
            margin-top: 0;
        }
        .main-article h3 {
            font-size: 1.5rem;
            font-weight: 600;
            margin: 36px 0 12px;
            color: var(--primary-light);
            line-height: 1.3;
        }
        .main-article h4 {
            font-size: 1.2rem;
            font-weight: 600;
            margin: 24px 0 8px;
            color: var(--text);
        }
        .main-article p {
            margin-bottom: 18px;
            font-size: 1.05rem;
            color: var(--text);
        }
        .main-article ul,
        .main-article ol {
            margin: 0 0 20px 24px;
            font-size: 1.05rem;
        }
        .main-article li {
            margin-bottom: 8px;
        }
        .main-article .highlight-box {
            background: #f0f4ff;
            border-left: 4px solid var(--accent);
            padding: 18px 24px;
            border-radius: 0 var(--radius) var(--radius) 0;
            margin: 24px 0;
        }
        .main-article .highlight-box i {
            color: var(--accent);
            margin-right: 8px;
        }
        .main-article .stat-tip {
            display: inline-block;
            background: var(--primary);
            color: #fff;
            padding: 2px 14px;
            border-radius: 60px;
            font-size: 0.8rem;
            font-weight: 600;
            letter-spacing: 0.3px;
        }
        .hero-image-wrap {
            margin: 32px 0 28px;
            border-radius: var(--radius);
            overflow: hidden;
            box-shadow: var(--shadow);
            position: relative;
        }
        .hero-image-wrap img {
            width: 100%;
            object-fit: cover;
        }
        .hero-image-wrap .img-caption {
            background: rgba(15, 27, 61, 0.85);
            color: #eee;
            padding: 10px 18px;
            font-size: 0.85rem;
            position: absolute;
            bottom: 0;
            left: 0;
            right: 0;
        }
        .sidebar {
            display: flex;
            flex-direction: column;
            gap: 28px;
        }
        .sidebar-card {
            background: var(--card-bg);
            border-radius: var(--radius);
            padding: 22px 24px;
            box-shadow: var(--shadow);
        }
        .sidebar-card h3 {
            font-size: 1.15rem;
            font-weight: 700;
            margin-bottom: 14px;
            color: var(--primary);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .sidebar-card h3 i {
            color: var(--accent);
        }
        .sidebar-card ul {
            list-style: none;
            padding: 0;
            margin: 0;
        }
        .sidebar-card li {
            padding: 6px 0;
            border-bottom: 1px solid var(--border);
        }
        .sidebar-card li:last-child {
            border-bottom: none;
        }
        .sidebar-card a {
            font-weight: 500;
            font-size: 0.95rem;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .sidebar-card a i {
            font-size: 0.75rem;
            color: var(--accent);
        }
        .feedback-section {
            margin-top: 48px;
            padding-top: 32px;
            border-top: 2px solid var(--border);
        }
        .feedback-section h3 {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--primary);
            margin-bottom: 8px;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .feedback-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 28px;
            margin-top: 20px;
        }
        .feedback-card {
            background: #fafbff;
            border-radius: var(--radius);
            padding: 22px 26px;
            border: 1px solid var(--border);
        }
        .feedback-card h4 {
            font-size: 1.1rem;
            font-weight: 600;
            margin-bottom: 14px;
            color: var(--primary-light);
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card label {
            font-weight: 500;
            font-size: 0.92rem;
            display: block;
            margin-bottom: 4px;
            color: var(--text-light);
        }
        .feedback-card input,
        .feedback-card textarea {
            width: 100%;
            padding: 10px 14px;
            border: 1px solid var(--border);
            border-radius: 8px;
            font-family: var(--font);
            font-size: 0.95rem;
            margin-bottom: 12px;
            transition: border var(--transition);
            background: #fff;
        }
        .feedback-card input:focus,
        .feedback-card textarea:focus {
            outline: none;
            border-color: var(--primary-light);
        }
        .feedback-card textarea {
            min-height: 80px;
            resize: vertical;
        }
        .feedback-card .btn-submit {
            background: var(--primary);
            color: #fff;
            border: none;
            padding: 10px 24px;
            border-radius: 8px;
            font-weight: 600;
            font-size: 0.95rem;
            cursor: pointer;
            transition: background var(--transition);
            display: inline-flex;
            align-items: center;
            gap: 8px;
        }
        .feedback-card .btn-submit:hover {
            background: var(--primary-light);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            gap: 4px;
            justify-content: flex-end;
            margin-bottom: 12px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 1.8rem;
            color: #ddd;
            cursor: pointer;
            transition: color var(--transition);
        }
        .star-rating input:checked~label,
        .star-rating label:hover,
        .star-rating label:hover~label {
            color: var(--accent);
        }
        friend-link {
            display: block;
            padding: 24px 0 12px;
        }
        friend-link ul {
            display: flex;
            flex-wrap: wrap;
            gap: 12px 24px;
            list-style: none;
            padding: 0;
            margin: 8px 0 0;
        }
        friend-link li a {
            font-weight: 500;
            font-size: 0.92rem;
            color: var(--text-light);
            border-bottom: 1px solid transparent;
            transition: border var(--transition), color var(--transition);
        }
        friend-link li a:hover {
            color: var(--primary);
            border-bottom-color: var(--accent);
        }
        .site-footer {
            background: var(--primary);
            color: rgba(255, 255, 255, 0.85);
            padding: 32px 0 24px;
            margin-top: 20px;
        }
        .site-footer .footer-inner {
            display: flex;
            flex-wrap: wrap;
            justify-content: space-between;
            align-items: center;
            gap: 16px;
        }
        .site-footer .copyright {
            font-size: 0.88rem;
            opacity: 0.8;
        }
        .site-footer .copyright i {
            color: var(--accent);
        }
        @media (max-width: 992px) {
            .content-grid {
                grid-template-columns: 1fr;
            }
            .main-article {
                padding: 28px 20px;
            }
            .hero h1 {
                font-size: 2.2rem;
            }
            .feedback-grid {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 768px) {
            .nav-toggle {
                display: block;
            }
            .main-nav {
                display: none;
                flex-direction: column;
                width: 100%;
                background: rgba(255, 255, 255, 0.05);
                padding: 12px 0;
                border-radius: 12px;
                margin-top: 8px;
            }
            .main-nav.open {
                display: flex;
            }
            .main-nav a {
                padding: 10px 18px;
                border-radius: 0;
                width: 100%;
                border-bottom: 1px solid rgba(255, 255, 255, 0.05);
            }
            .main-nav a:last-child {
                border-bottom: none;
            }
            .header-inner {
                align-items: flex-start;
            }
            .hero h1 {
                font-size: 1.8rem;
            }
            .hero p {
                font-size: 1rem;
            }
            .hero .meta-badge {
                padding: 8px 16px;
                font-size: 0.8rem;
                gap: 12px;
            }
            .main-article h2 {
                font-size: 1.6rem;
            }
            .main-article h3 {
                font-size: 1.25rem;
            }
            .search-form {
                flex-direction: column;
                border-radius: 16px;
            }
            .search-form input {
                border-radius: 16px 16px 0 0;
                padding: 12px 16px;
            }
            .search-form button {
                border-radius: 0 0 16px 16px;
                justify-content: center;
                padding: 12px;
            }
            .sidebar {
                order: 2;
            }
            .site-footer .footer-inner {
                flex-direction: column;
                text-align: center;
            }
        }
        @media (max-width: 480px) {
            .container {
                padding: 0 14px;
            }
            .hero {
                padding: 36px 0 32px;
            }
            .hero h1 {
                font-size: 1.5rem;
            }
            .main-article {
                padding: 18px 14px;
            }
            .main-article p {
                font-size: 0.98rem;
            }
            .feedback-card {
                padding: 16px 18px;
            }
        }
        .text-accent {
            color: var(--accent);
        }
        .mb-0 {
            margin-bottom: 0;
        }
        .mt-0 {
            margin-top: 0;
        }
        .fw-700 {
            font-weight: 700;
        }
        .gap-4 {
            gap: 4px;
        }
        .flex-center {
            display: flex;
            align-items: center;
        }