* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        :root {
            --primary: #4a148c;
            --secondary: #ff6f00;
            --accent: #00b0ff;
            --dark: #1a1a2e;
            --light: #f8f9fa;
            --gray: #6c757d;
            --success: #28a745;
            --danger: #dc3545;
            --border-radius: 12px;
            --shadow: 0 8px 30px rgba(0, 0, 0, 0.12);
            --transition: all 0.3s ease;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.8;
            color: #333;
            background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
            min-height: 100vh;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: var(--dark);
            color: white;
            padding: 1rem 0;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo {
            font-size: 2.2rem;
            font-weight: 800;
            text-decoration: none;
            color: white;
            display: flex;
            align-items: center;
            gap: 10px;
            text-transform: uppercase;
            letter-spacing: 1px;
            background: linear-gradient(45deg, var(--secondary), var(--accent));
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
        }
        .logo:hover {
            transform: scale(1.05);
            transition: var(--transition);
        }
        .nav-desktop {
            display: flex;
            gap: 2rem;
        }
        @media (max-width: 768px) {
            .nav-desktop {
                display: none;
            }
        }
        .nav-desktop a {
            color: white;
            text-decoration: none;
            font-weight: 600;
            padding: 0.5rem 1rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .nav-desktop a:hover {
            background: var(--primary);
            color: var(--secondary);
        }
        .hamburger {
            display: none;
            background: none;
            border: none;
            color: white;
            font-size: 1.8rem;
            cursor: pointer;
        }
        @media (max-width: 768px) {
            .hamburger {
                display: block;
            }
        }
        .mobile-nav {
            position: fixed;
            top: 70px;
            left: 0;
            width: 100%;
            background: var(--dark);
            padding: 1rem;
            display: none;
            flex-direction: column;
            gap: 1rem;
            box-shadow: var(--shadow);
            z-index: 999;
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: white;
            text-decoration: none;
            padding: 1rem;
            border-bottom: 1px solid rgba(255,255,255,0.1);
        }
        .mobile-nav a:hover {
            background: var(--primary);
        }
        .breadcrumb {
            background: white;
            padding: 1rem;
            border-radius: var(--border-radius);
            margin: 1rem 0;
            box-shadow: 0 2px 8px rgba(0,0,0,0.05);
        }
        .breadcrumb a {
            color: var(--primary);
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 2rem 0;
        }
        .article-header {
            background: white;
            padding: 3rem;
            border-radius: var(--border-radius);
            margin-bottom: 2rem;
            box-shadow: var(--shadow);
            text-align: center;
        }
        h1 {
            font-size: 3rem;
            color: var(--dark);
            margin-bottom: 1rem;
            line-height: 1.2;
        }
        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
        }
        .meta-info {
            display: flex;
            justify-content: center;
            gap: 2rem;
            color: var(--gray);
            margin-top: 1.5rem;
            flex-wrap: wrap;
        }
        .meta-info i {
            color: var(--secondary);
            margin-right: 0.5rem;
        }
        .search-container {
            background: white;
            padding: 2rem;
            border-radius: var(--border-radius);
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .search-form {
            display: flex;
            gap: 0;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-input {
            flex: 1;
            padding: 1rem 1.5rem;
            border: 2px solid #ddd;
            border-radius: var(--border-radius) 0 0 var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
        }
        .search-input:focus {
            outline: none;
            border-color: var(--accent);
        }
        .search-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 0 2rem;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
            cursor: pointer;
            font-weight: 600;
            transition: var(--transition);
        }
        .search-btn:hover {
            background: var(--secondary);
        }
        .tier-section {
            background: white;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            margin: 2.5rem 0;
            box-shadow: var(--shadow);
        }
        h2 {
            color: var(--primary);
            font-size: 2.2rem;
            margin-bottom: 1.5rem;
            padding-bottom: 0.5rem;
            border-bottom: 3px solid var(--secondary);
        }
        h3 {
            color: var(--dark);
            font-size: 1.6rem;
            margin: 2rem 0 1rem;
        }
        .tier-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2rem;
            margin: 2rem 0;
        }
        .tier-card {
            background: linear-gradient(145deg, #ffffff, #f0f0f0);
            border-radius: var(--border-radius);
            padding: 1.5rem;
            border-left: 6px solid;
            transition: var(--transition);
            box-shadow: 0 4px 15px rgba(0,0,0,0.08);
        }
        .tier-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 12px 25px rgba(0,0,0,0.15);
        }
        .tier-s { border-left-color: #ffd700; background: linear-gradient(145deg, #fff9e6, #ffe680); }
        .tier-a { border-left-color: #ff6b6b; background: linear-gradient(145deg, #ffe6e6, #ffb3b3); }
        .tier-b { border-left-color: #4ecdc4; background: linear-gradient(145deg, #e6f7f6, #80e5de); }
        .tier-c { border-left-color: #45b7d1; background: linear-gradient(145deg, #e6f4f8, #80d1e8); }
        .tier-d { border-left-color: #96ceb4; background: linear-gradient(145deg, #e9f6ef, #b8e2cd); }
        .tier-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 1rem;
        }
        .tier-title {
            font-size: 1.8rem;
            font-weight: 800;
        }
        .tier-cards {
            display: flex;
            flex-wrap: wrap;
            gap: 0.8rem;
        }
        .card-item {
            background: white;
            padding: 0.6rem 1rem;
            border-radius: 50px;
            font-weight: 600;
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .card-item i {
            color: var(--secondary);
        }
        .featured-image {
            width: 100%;
            max-height: 500px;
            object-fit: cover;
            border-radius: var(--border-radius);
            margin: 2rem 0;
            box-shadow: var(--shadow);
        }
        .article-content {
            background: white;
            padding: 3rem;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow);
            margin: 2rem 0;
        }
        p {
            margin-bottom: 1.5rem;
            font-size: 1.1rem;
        }
        .highlight {
            background: linear-gradient(120deg, rgba(255, 111, 0, 0.1) 0%, rgba(255, 111, 0, 0.05) 100%);
            border-left: 4px solid var(--secondary);
            padding: 1.5rem;
            margin: 2rem 0;
            border-radius: 0 var(--border-radius) var(--border-radius) 0;
        }
        .stats-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .stat-box {
            background: var(--light);
            padding: 1.5rem;
            border-radius: var(--border-radius);
            text-align: center;
            border-top: 4px solid var(--accent);
        }
        .stat-number {
            font-size: 2.5rem;
            font-weight: 800;
            color: var(--primary);
            display: block;
        }
        .user-interaction {
            background: white;
            padding: 2.5rem;
            border-radius: var(--border-radius);
            margin: 2.5rem 0;
            box-shadow: var(--shadow);
        }
        .rating-system {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin: 1.5rem 0;
            flex-wrap: wrap;
        }
        .stars {
            display: flex;
            gap: 0.5rem;
        }
        .star {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: var(--transition);
        }
        .star:hover,
        .star.active {
            color: #ffd700;
        }
        .comment-form textarea,
        .comment-form input {
            width: 100%;
            padding: 1rem;
            margin-bottom: 1rem;
            border: 2px solid #eee;
            border-radius: var(--border-radius);
            font-family: inherit;
            transition: var(--transition);
        }
        .comment-form textarea:focus,
        .comment-form input:focus {
            outline: none;
            border-color: var(--accent);
        }
        .submit-btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 1rem 2rem;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            font-size: 1.1rem;
            transition: var(--transition);
        }
        .submit-btn:hover {
            background: var(--secondary);
            transform: translateY(-2px);
        }
        .footer-links {
            background: var(--dark);
            padding: 3rem 0;
            margin-top: 3rem;
        }
        .web-links-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin-bottom: 2rem;
        }
        .web-link {
            background: rgba(255,255,255,0.05);
            padding: 1.2rem;
            border-radius: var(--border-radius);
            transition: var(--transition);
        }
        .web-link:hover {
            background: rgba(255,255,255,0.1);
            transform: translateX(5px);
        }
        .web-link a {
            color: white;
            text-decoration: none;
            font-size: 1rem;
            display: block;
        }
        .web-link a:hover {
            color: var(--secondary);
        }
        footer {
            background: #0f0f1a;
            color: white;
            padding: 2rem 0;
            text-align: center;
        }
        .footer-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
            gap: 1rem;
        }
        @media (max-width: 768px) {
            .footer-content {
                flex-direction: column;
                text-align: center;
            }
        }
        .social-links {
            display: flex;
            gap: 1rem;
        }
        .social-links a {
            color: white;
            font-size: 1.5rem;
            transition: var(--transition);
        }
        .social-links a:hover {
            color: var(--secondary);
            transform: translateY(-3px);
        }
        .emoji {
            font-size: 1.2em;
            margin: 0 0.2em;
        }
        .keyword {
            background: linear-gradient(120deg, rgba(74, 20, 140, 0.1) 0%, rgba(74, 20, 140, 0.05) 100%);
            padding: 0.2em 0.5em;
            border-radius: 4px;
            font-weight: 600;
            color: var(--primary);
        }
        .tooltip {
            position: relative;
            border-bottom: 1px dashed var(--accent);
            cursor: help;
        }
        .tooltip-text {
            visibility: hidden;
            width: 300px;
            background: var(--dark);
            color: white;
            text-align: center;
            padding: 0.8rem;
            border-radius: var(--border-radius);
            position: absolute;
            z-index: 1;
            bottom: 125%;
            left: 50%;
            transform: translateX(-50%);
            opacity: 0;
            transition: opacity 0.3s;
            font-size: 0.9rem;
        }
        .tooltip:hover .tooltip-text {
            visibility: visible;
            opacity: 1;
        }
        @media (max-width: 768px) {
            .article-header,
            .article-content,
            .tier-section,
            .user-interaction {
                padding: 1.5rem;
            }
            .container {
                padding: 0 15px;
            }
        }