* {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }
        html {
            scroll-behavior: smooth;
        }
        body {
            background: linear-gradient(135deg, #0c1a2d 0%, #1a3a5f 100%);
            color: #e0e7ff;
            line-height: 1.7;
            overflow-x: hidden;
        }
        .container {
            width: 100%;
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background: rgba(12, 26, 45, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 2px solid #00eeff;
            position: sticky;
            top: 0;
            z-index: 1000;
            padding: 15px 0;
        }
        .header-content {
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            background: linear-gradient(90deg, #00eeff, #00ffaa);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            text-decoration: none;
            letter-spacing: 1px;
        }
        .logo a:hover {
            text-shadow: 0 0 15px rgba(0, 238, 255, 0.7);
        }
        .desktop-nav ul {
            display: flex;
            list-style: none;
            gap: 30px;
        }
        .desktop-nav a {
            color: #b0d7ff;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
            padding: 8px 12px;
            border-radius: 6px;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .desktop-nav a:hover,
        .desktop-nav a.active {
            background: rgba(0, 238, 255, 0.15);
            color: #00eeff;
            box-shadow: 0 0 10px rgba(0, 238, 255, 0.5);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            color: #00eeff;
            cursor: pointer;
            background: none;
            border: none;
        }
        .mobile-nav {
            position: fixed;
            top: 80px;
            left: 0;
            width: 100%;
            background: rgba(12, 26, 45, 0.98);
            backdrop-filter: blur(10px);
            padding: 20px;
            display: none;
            flex-direction: column;
            gap: 15px;
            border-top: 1px solid #00eeff;
            z-index: 999;
        }
        .mobile-nav.active {
            display: flex;
        }
        .mobile-nav a {
            color: #b0d7ff;
            text-decoration: none;
            font-size: 1.2rem;
            padding: 12px;
            border-left: 4px solid transparent;
            transition: all 0.3s;
        }
        .mobile-nav a:hover,
        .mobile-nav a.active {
            border-left-color: #00eeff;
            background: rgba(0, 238, 255, 0.1);
            color: #00eeff;
        }
        .breadcrumb {
            padding: 15px 0;
            font-size: 0.9rem;
            color: #88aadd;
        }
        .breadcrumb a {
            color: #00eeff;
            text-decoration: none;
        }
        .breadcrumb a:hover {
            text-decoration: underline;
        }
        main {
            padding: 30px 0;
        }
        article {
            background: rgba(18, 35, 58, 0.7);
            border-radius: 20px;
            padding: 40px;
            margin-bottom: 40px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
            border: 1px solid #2a4a6d;
        }
        h1 {
            font-size: 2.8rem;
            color: #00ffaa;
            margin-bottom: 25px;
            line-height: 1.2;
            text-align: center;
            text-shadow: 0 0 10px rgba(0, 255, 170, 0.5);
        }
        h2 {
            font-size: 2.2rem;
            color: #00eeff;
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 2px dashed #00eeff;
        }
        h3 {
            font-size: 1.8rem;
            color: #88ddff;
            margin: 30px 0 15px;
        }
        h4 {
            font-size: 1.4rem;
            color: #aaddff;
            margin: 20px 0 10px;
        }
        p {
            margin-bottom: 25px;
            font-size: 1.2rem;
            text-align: justify;
        }
        .highlight {
            background: rgba(0, 238, 255, 0.1);
            border-left: 5px solid #00eeff;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 10px 10px 0;
        }
        .tip {
            background: rgba(0, 255, 170, 0.1);
            border-left: 5px solid #00ffaa;
            padding: 20px;
            margin: 25px 0;
            border-radius: 0 10px 10px 0;
        }
        b, strong {
            color: #00ffaa;
            font-weight: 700;
        }
        em {
            color: #ffaa00;
            font-style: italic;
        }
        ul, ol {
            margin-left: 30px;
            margin-bottom: 25px;
        }
        li {
            margin-bottom: 10px;
            font-size: 1.15rem;
        }
        img {
            max-width: 100%;
            height: auto;
            border-radius: 15px;
            border: 2px solid #00eeff;
            display: block;
            margin: 30px auto;
            box-shadow: 0 5px 20px rgba(0, 0, 0, 0.7);
            transition: transform 0.5s;
        }
        img:hover {
            transform: scale(1.02);
        }
        .image-caption {
            text-align: center;
            font-style: italic;
            color: #88aadd;
            margin-top: -20px;
            margin-bottom: 30px;
        }
        .tier-table {
            width: 100%;
            border-collapse: collapse;
            margin: 40px 0;
            font-size: 1.1rem;
            background: rgba(10, 25, 47, 0.8);
            border-radius: 15px;
            overflow: hidden;
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.5);
        }
        .tier-table th {
            background: linear-gradient(90deg, #0066cc, #00aaff);
            color: white;
            padding: 18px;
            text-align: left;
            font-size: 1.3rem;
        }
        .tier-table td {
            padding: 15px;
            border-bottom: 1px solid #2a4a6d;
        }
        .tier-table tr:last-child td {
            border-bottom: none;
        }
        .tier-table tr:hover {
            background: rgba(0, 238, 255, 0.1);
        }
        .tier-S { color: #ff6b9d; font-weight: bold; }
        .tier-A { color: #ffaa00; font-weight: bold; }
        .tier-B { color: #00ffaa; font-weight: bold; }
        .tier-C { color: #00aaff; font-weight: bold; }
        .tier-D { color: #aa66ff; font-weight: bold; }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 50px 0;
        }
        .interactive-box {
            background: rgba(18, 35, 58, 0.9);
            border-radius: 15px;
            padding: 30px;
            border: 1px solid #2a4a6d;
            transition: transform 0.3s, box-shadow 0.3s;
        }
        .interactive-box:hover {
            transform: translateY(-10px);
            box-shadow: 0 15px 30px rgba(0, 238, 255, 0.2);
            border-color: #00eeff;
        }
        .interactive-box h3 {
            color: #00eeff;
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .interactive-box form {
            display: flex;
            flex-direction: column;
            gap: 20px;
        }
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 8px;
        }
        label {
            color: #aaddff;
            font-weight: 600;
        }
        input, textarea, select {
            padding: 15px;
            background: rgba(10, 25, 47, 0.8);
            border: 1px solid #2a4a6d;
            border-radius: 10px;
            color: #e0e7ff;
            font-size: 1rem;
            transition: border 0.3s;
        }
        input:focus, textarea:focus, select:focus {
            outline: none;
            border-color: #00eeff;
            box-shadow: 0 0 10px rgba(0, 238, 255, 0.5);
        }
        button {
            padding: 16px 30px;
            background: linear-gradient(90deg, #00aa66, #00eeff);
            color: white;
            border: none;
            border-radius: 10px;
            font-size: 1.1rem;
            font-weight: bold;
            cursor: pointer;
            transition: all 0.3s;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            gap: 10px;
        }
        button:hover {
            background: linear-gradient(90deg, #00eeff, #00aa66);
            box-shadow: 0 0 20px rgba(0, 238, 255, 0.7);
        }
        .stars {
            display: flex;
            gap: 10px;
            justify-content: center;
            margin: 15px 0;
        }
        .star {
            font-size: 2.5rem;
            color: #444;
            cursor: pointer;
            transition: color 0.3s;
        }
        .star.active,
        .star:hover {
            color: #ffaa00;
        }
        .footer-links {
            background: rgba(10, 25, 47, 0.9);
            padding: 40px 0;
            margin-top: 50px;
            border-top: 2px solid #00eeff;
        }
        .web-link {
            display: inline-block;
            background: rgba(0, 238, 255, 0.1);
            margin: 10px;
            padding: 15px 25px;
            border-radius: 50px;
            border: 1px solid #00eeff;
            transition: all 0.3s;
        }
        .web-link a {
            color: #aaddff;
            text-decoration: none;
            font-weight: 600;
            font-size: 1.1rem;
        }
        .web-link:hover {
            background: rgba(0, 238, 255, 0.3);
            transform: translateY(-5px);
        }
        .web-link a:hover {
            color: #00eeff;
        }
        footer {
            background: #0a192f;
            color: #88aadd;
            text-align: center;
            padding: 30px 0;
            border-top: 1px solid #2a4a6d;
        }
        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
        }
        .social-icons {
            display: flex;
            gap: 20px;
            font-size: 1.8rem;
        }
        .social-icons a {
            color: #88aadd;
            transition: color 0.3s;
        }
        .social-icons a:hover {
            color: #00eeff;
        }
        .copyright {
            font-size: 0.9rem;
            opacity: 0.8;
        }
        @media (max-width: 992px) {
            .desktop-nav {
                display: none;
            }
            .hamburger {
                display: block;
            }
            h1 {
                font-size: 2.2rem;
            }
            h2 {
                font-size: 1.8rem;
            }
            h3 {
                font-size: 1.5rem;
            }
            article {
                padding: 30px 20px;
            }
            .interactive-section {
                grid-template-columns: 1fr;
            }
        }
        @media (max-width: 576px) {
            .container {
                padding: 0 15px;
            }
            h1 {
                font-size: 1.8rem;
            }
            .logo a {
                font-size: 1.8rem;
            }
            .tier-table {
                font-size: 0.9rem;
            }
            .tier-table th,
            .tier-table td {
                padding: 10px;
            }
        }