*,
        *::before,
        *::after {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            line-height: 1.75;
            color: #1a1a2e;
            background: #f4f6fb;
            font-size: 16px;
        }
        a {
            color: #4361ee;
            text-decoration: none;
        }
        a:hover {
            text-decoration: underline;
            color: #3a0ca3;
        }
        h1,
        h2,
        h3,
        h4,
        h5 {
            line-height: 1.3;
            margin: 1.5em 0 0.5em;
            color: #16213e;
        }
        h1 {
            font-size: 2.5rem;
            font-weight: 800;
        }
        h2 {
            font-size: 2rem;
            border-bottom: 3px solid #4361ee;
            padding-bottom: 0.3em;
        }
        h3 {
            font-size: 1.5rem;
            color: #3a0ca3;
        }
        h4 {
            font-size: 1.2rem;
            color: #4cc9f0;
        }
        p {
            margin-bottom: 1em;
        }
        ul,
        ol {
            margin-left: 1.5em;
            margin-bottom: 1.2em;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 10px;
        }
        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        .site-header {
            background: linear-gradient(135deg, #1a1a2e 0%, #16213e 60%, #0f3460 100%);
            padding: 15px 0;
            position: sticky;
            top: 0;
            z-index: 999;
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }
        .header-inner {
            display: flex;
            align-items: center;
            justify-content: space-between;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2rem;
            font-weight: 900;
            color: #ffffff;
            text-decoration: none;
            letter-spacing: -0.5px;
            text-shadow: 2px 2px 8px rgba(67, 97, 238, 0.5);
        }
        .my-logo:hover {
            color: #4cc9f0;
            text-decoration: none;
        }
        .my-logo i {
            margin-right: 8px;
        }
        .nav-menu {
            display: flex;
            gap: 20px;
            list-style: none;
            transition: all 0.3s ease;
        }
        .nav-menu li a {
            color: #e0e0ff;
            font-weight: 600;
            padding: 8px 12px;
            border-radius: 20px;
            transition: 0.3s;
        }
        .nav-menu li a:hover {
            background: rgba(255, 255, 255, 0.1);
            color: #4cc9f0;
            text-decoration: none;
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            color: #fff;
            background: none;
            border: none;
            cursor: pointer;
        }
        .breadcrumb {
            background: #e8ecf5;
            padding: 10px 0;
            font-size: 0.9rem;
            margin-bottom: 0;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
            gap: 8px;
            color: #666;
        }
        .breadcrumb a {
            color: #4361ee;
        }
        .breadcrumb i {
            font-size: 0.8rem;
            color: #999;
        }
        .hero {
            background: linear-gradient(120deg, #0f3460, #4361ee);
            color: white;
            padding: 60px 20px;
            text-align: center;
        }
        .hero h1 {
            color: #fff;
            font-size: 3rem;
            max-width: 800px;
            margin: 0 auto 15px;
            text-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
        }
        .hero p {
            font-size: 1.2rem;
            color: #d0d9ff;
            max-width: 700px;
            margin: 0 auto;
        }
        .content-grid {
            display: grid;
            grid-template-columns: 1fr;
            gap: 40px;
            padding: 40px 0;
        }
        .article-body {
            background: white;
            padding: 35px;
            border-radius: 16px;
            box-shadow: 0 4px 16px rgba(0, 0, 0, 0.06);
        }
        .article-body img {
            width: 100%;
            margin: 25px 0;
        }
        .figure-caption {
            font-size: 0.9rem;
            color: #777;
            text-align: center;
            margin-top: -15px;
            margin-bottom: 20px;
        }
        .table-wrapper {
            overflow-x: auto;
            margin: 20px 0;
        }
        table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.95rem;
        }
        th,
        td {
            border: 1px solid #e0e3f0;
            padding: 12px 15px;
            text-align: left;
        }
        th {
            background: #f0f2fa;
            font-weight: 700;
            color: #16213e;
        }
        tr:nth-child(even) {
            background: #f8f9fe;
        }
        .widget-card {
            background: white;
            padding: 25px;
            border-radius: 12px;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
            margin-bottom: 30px;
        }
        .widget-card h3 {
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .widget-card form {
            display: flex;
            gap: 10px;
            flex-wrap: wrap;
            margin-top: 15px;
        }
        .widget-card input,
        .widget-card textarea {
            flex: 1;
            min-width: 200px;
            padding: 10px 15px;
            border: 2px solid #e0e3f0;
            border-radius: 8px;
            font-size: 1rem;
            font-family: inherit;
            resize: vertical;
        }
        .widget-card input:focus,
        .widget-card textarea:focus {
            outline: none;
            border-color: #4361ee;
        }
        .btn-primary {
            background: #4361ee;
            color: white;
            border: none;
            padding: 12px 24px;
            border-radius: 30px;
            font-weight: 700;
            cursor: pointer;
            transition: 0.3s;
            font-size: 1rem;
        }
        .btn-primary:hover {
            background: #3a0ca3;
            box-shadow: 0 4px 15px rgba(67, 97, 238, 0.4);
            transform: translateY(-2px);
        }
        .star-rating {
            display: flex;
            flex-direction: row-reverse;
            justify-content: flex-start;
            gap: 5px;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ccc;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating label:hover,
        .star-rating label:hover~label,
        .star-rating input:checked~label {
            color: #ffb703;
        }
        .site-footer {
            background: #1a1a2e;
            color: #b0b5c9;
            padding: 40px 0 10px;
            margin-top: 50px;
            border-top: 4px solid #4361ee;
        }
        .site-footer a {
            color: #4cc9f0;
        }
        .site-footer a:hover {
            color: #90e0ef;
        }
        .friend-link {
            display: block;
            padding: 10px;
            margin: 8px 0;
            background: rgba(255, 255, 255, 0.05);
            border-radius: 8px;
        }
        .footer-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 30px;
            margin-bottom: 30px;
        }
        .copyright {
            border-top: 1px solid #333;
            padding-top: 15px;
            text-align: center;
            font-size: 0.85rem;
            color: #777;
        }
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
                flex-direction: column;
                width: 100%;
                background: #16213e;
                padding: 15px;
                border-radius: 0 0 12px 12px;
            }
            .nav-menu.open {
                display: flex;
            }
            .hamburger {
                display: block;
            }
            .header-inner {
                flex-wrap: wrap;
            }
            .hero h1 {
                font-size: 2rem;
            }
            .article-body {
                padding: 20px;
            }
        }
        @media (min-width: 769px) and (max-width: 1024px) {
            .nav-menu {
                gap: 10px;
            }
        }
        .scroll-top {
            position: fixed;
            bottom: 30px;
            right: 30px;
            background: #4361ee;
            color: white;
            width: 45px;
            height: 45px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 4px 15px rgba(67, 97, 238, 0.4);
            cursor: pointer;
            transition: 0.3s;
            opacity: 0.8;
            z-index: 999;
        }
        .scroll-top:hover {
            opacity: 1;
            transform: translateY(-3px);
        }