* { margin: 0; padding: 0; box-sizing: border-box; }
        html { scroll-behavior: smooth; }
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: #f8f9fa;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 15px;
        }
        a { color: #2563eb; text-decoration: none; transition: color 0.3s; }
        a:hover { color: #1d4ed8; text-decoration: underline; }
        img { max-width: 100%; height: auto; display: block; }
        .site-header {
            background: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            color: white;
            padding: 1.5rem 0;
            border-radius: 0 0 12px 12px;
            margin-bottom: 2rem;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            flex-wrap: wrap;
        }
        .my-logo {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, #60a5fa, #a78bfa);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.5px;
        }
        .my-logo a { background: transparent; }
        .my-logo:hover { transform: scale(1.02); }
        .nav-desktop { display: flex; gap: 2rem; }
        .nav-desktop a { color: #cbd5e1; font-weight: 500; padding: 0.5rem 0; }
        .nav-desktop a:hover { color: white; }
        .hamburger { display: none; font-size: 1.8rem; cursor: pointer; }
        .nav-mobile {
            display: none;
            flex-direction: column;
            width: 100%;
            background: #1e293b;
            border-radius: 8px;
            margin-top: 1rem;
            padding: 1rem;
        }
        .nav-mobile.active { display: flex; }
        .nav-mobile a { color: #cbd5e1; padding: 0.75rem; border-bottom: 1px solid #334155; }
        .nav-mobile a:last-child { border-bottom: none; }
        .breadcrumb {
            background: #e2e8f0;
            padding: 0.75rem 1rem;
            border-radius: 6px;
            margin: 1.5rem 0;
            font-size: 0.9rem;
        }
        .breadcrumb a { color: #4b5563; }
        .breadcrumb span { color: #6b7280; }
        article {
            background: white;
            padding: 2.5rem;
            border-radius: 12px;
            box-shadow: 0 6px 20px rgba(0, 0, 0, 0.05);
            margin-bottom: 2rem;
        }
        h1 {
            font-size: 2.8rem;
            color: #1e293b;
            margin-bottom: 1.5rem;
            line-height: 1.2;
            border-left: 5px solid #3b82f6;
            padding-left: 1rem;
        }
        h2 {
            font-size: 2rem;
            color: #334155;
            margin: 2.5rem 0 1rem;
            padding-bottom: 0.5rem;
            border-bottom: 2px solid #e2e8f0;
        }
        h3 { font-size: 1.5rem; color: #475569; margin: 1.8rem 0 1rem; }
        h4 { font-size: 1.2rem; color: #64748b; margin: 1.5rem 0 0.8rem; }
        p { margin-bottom: 1.2rem; text-align: justify; }
        .highlight {
            background: #fef3c7;
            border-left: 4px solid #f59e0b;
            padding: 1.2rem;
            margin: 1.5rem 0;
            border-radius: 0 8px 8px 0;
        }
        .tier-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 2rem 0;
        }
        .tier-card {
            background: #f8fafc;
            border: 1px solid #e2e8f0;
            border-radius: 10px;
            padding: 1.5rem;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .tier-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 25px rgba(0, 0, 0, 0.08);
        }
        .tier-s { border-top: 5px solid #fbbf24; }
        .tier-a { border-top: 5px solid #60a5fa; }
        .tier-b { border-top: 5px solid #34d399; }
        .search-box {
            background: #f1f5f9;
            padding: 2rem;
            border-radius: 10px;
            margin: 2rem 0;
            text-align: center;
        }
        .search-box form {
            display: flex;
            max-width: 600px;
            margin: 0 auto;
        }
        .search-box input {
            flex: 1;
            padding: 0.9rem 1.2rem;
            border: 2px solid #cbd5e1;
            border-radius: 8px 0 0 8px;
            font-size: 1rem;
        }
        .search-box button {
            background: #3b82f6;
            color: white;
            border: none;
            padding: 0 1.8rem;
            border-radius: 0 8px 8px 0;
            cursor: pointer;
            font-weight: 600;
            transition: background 0.3s;
        }
        .search-box button:hover { background: #2563eb; }
        .rating-section, .comments-section {
            background: #f8fafc;
            border-radius: 10px;
            padding: 2rem;
            margin: 2.5rem 0;
            border: 1px solid #e2e8f0;
        }
        .rating-stars { font-size: 1.8rem; color: #fbbf24; margin: 1rem 0; }
        .rating-stars i { cursor: pointer; margin: 0 2px; }
        .form-group { margin-bottom: 1.5rem; }
        .form-group label { display: block; margin-bottom: 0.5rem; font-weight: 600; }
        .form-group input, .form-group textarea, .form-group select {
            width: 100%;
            padding: 0.9rem;
            border: 1px solid #cbd5e1;
            border-radius: 6px;
            font-family: inherit;
            font-size: 1rem;
        }
        .submit-btn {
            background: #10b981;
            color: white;
            padding: 0.9rem 2rem;
            border: none;
            border-radius: 6px;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.3s;
        }
        .submit-btn:hover { background: #059669; }
        footer {
            background: #0f172a;
            color: #cbd5e1;
            padding: 3rem 1rem;
            border-radius: 12px 12px 0 0;
            margin-top: 3rem;
        }
        .footer-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2.5rem;
        }
        .footer-links h3 { color: white; margin-bottom: 1.2rem; font-size: 1.3rem; }
        .footer-links ul { list-style: none; }
        .footer-links li { margin-bottom: 0.7rem; }
        .footer-links a { color: #94a3b8; }
        .footer-links a:hover { color: white; }
        friend-link {
            display: inline-block;
            background: #1e293b;
            padding: 0.6rem 1.2rem;
            border-radius: 20px;
            margin: 0.3rem;
            font-size: 0.9rem;
        }
        .copyright {
            text-align: center;
            margin-top: 2.5rem;
            padding-top: 2rem;
            border-top: 1px solid #334155;
            color: #94a3b8;
            font-size: 0.9rem;
        }
        @media (max-width: 768px) {
            body { padding: 0 10px; }
            h1 { font-size: 2.2rem; }
            h2 { font-size: 1.7rem; }
            article { padding: 1.5rem; }
            .header-container { flex-direction: column; align-items: flex-start; }
            .nav-desktop { display: none; }
            .hamburger { display: block; align-self: center; }
            .search-box form { flex-direction: column; }
            .search-box input { border-radius: 8px; margin-bottom: 0.8rem; }
            .search-box button { border-radius: 8px; padding: 0.9rem; }
            .tier-grid { grid-template-columns: 1fr; }
        }