:root {
            --ac-green: #8BC34A;
            --ac-dark-green: #4CAF50;
            --ac-blue: #42A5F5;
            --ac-light: #F1F8E9;
            --ac-brown: #8D6E63;
            --ac-yellow: #FFEB3B;
            --ac-white: #FFFFFF;
            --ac-gray: #757575;
            --shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
            --transition: all 0.3s ease;
        }
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        body {
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            line-height: 1.7;
            color: #333;
            background-color: var(--ac-light);
            overflow-x: hidden;
        }
        a {
            color: var(--ac-dark-green);
            text-decoration: none;
            transition: var(--transition);
        }
        a:hover {
            color: var(--ac-brown);
        }
        img {
            max-width: 100%;
            height: auto;
            display: block;
        }
        .container {
            width: 100%;
            max-width: 1280px;
            margin: 0 auto;
            padding: 0 20px;
        }
        header {
            background-color: var(--ac-white);
            box-shadow: var(--shadow);
            position: sticky;
            top: 0;
            z-index: 1000;
        }
        .header-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 15px 0;
        }
        .logo a {
            font-size: 2.2rem;
            font-weight: 800;
            color: var(--ac-dark-green);
            font-family: 'Comic Sans MS', cursive;
            letter-spacing: 1px;
        }
        .logo a span {
            color: var(--ac-brown);
        }
        nav {
            display: flex;
            align-items: center;
        }
        .nav-links {
            display: flex;
            list-style: none;
        }
        .nav-links li {
            margin-left: 30px;
        }
        .nav-links a {
            font-weight: 600;
            font-size: 1.1rem;
            padding: 8px 5px;
            border-bottom: 2px solid transparent;
        }
        .nav-links a:hover,
        .nav-links a.active {
            border-bottom-color: var(--ac-green);
        }
        .hamburger {
            display: none;
            font-size: 1.8rem;
            cursor: pointer;
            color: var(--ac-dark-green);
        }
        .breadcrumb {
            background-color: #E8F5E9;
            padding: 12px 0;
            font-size: 0.95rem;
        }
        .breadcrumb .container {
            display: flex;
            align-items: center;
        }
        .breadcrumb a {
            color: var(--ac-gray);
        }
        .breadcrumb a:hover {
            color: var(--ac-dark-green);
        }
        .breadcrumb i {
            margin: 0 10px;
            color: var(--ac-gray);
            font-size: 0.8rem;
        }
        main {
            padding: 40px 0;
            background-color: var(--ac-white);
            border-radius: 10px;
            margin: 30px auto;
            box-shadow: var(--shadow);
        }
        .article-header {
            text-align: center;
            padding-bottom: 30px;
            border-bottom: 2px dashed var(--ac-green);
            margin-bottom: 40px;
        }
        .article-header h1 {
            font-size: 2.8rem;
            color: var(--ac-dark-green);
            margin-bottom: 15px;
            line-height: 1.2;
        }
        .article-meta {
            display: flex;
            justify-content: center;
            align-items: center;
            flex-wrap: wrap;
            gap: 20px;
            color: var(--ac-gray);
            font-size: 0.95rem;
        }
        .article-meta span {
            display: inline-flex;
            align-items: center;
            gap: 5px;
        }
        .article-content {
            padding: 0 30px;
        }
        .article-content h2 {
            font-size: 2rem;
            color: var(--ac-brown);
            margin: 40px 0 20px;
            padding-bottom: 10px;
            border-bottom: 1px solid #eee;
        }
        .article-content h3 {
            font-size: 1.6rem;
            color: var(--ac-dark-green);
            margin: 30px 0 15px;
        }
        .article-content p {
            margin-bottom: 1.5em;
            font-size: 1.1rem;
            text-align: justify;
        }
        .article-content strong {
            color: var(--ac-dark-green);
            font-weight: 700;
        }
        .article-content em {
            color: var(--ac-brown);
            font-style: italic;
        }
        .tier-list-section {
            background: linear-gradient(135deg, #f9f9f9 0%, #e8f5e9 100%);
            border-radius: 15px;
            padding: 30px;
            margin: 40px 0;
            border-left: 5px solid var(--ac-blue);
        }
        .tier-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 25px;
            margin-top: 25px;
        }
        .tier-card {
            background: var(--ac-white);
            border-radius: 10px;
            overflow: hidden;
            box-shadow: var(--shadow);
            transition: transform 0.4s ease, box-shadow 0.4s ease;
        }
        .tier-card:hover {
            transform: translateY(-10px);
            box-shadow: 0 12px 20px rgba(0,0,0,0.15);
        }
        .tier-header {
            padding: 15px;
            color: white;
            font-weight: bold;
            text-align: center;
            font-size: 1.3rem;
        }
        .tier-s { background: linear-gradient(90deg, #FF9800, #FFC107); }
        .tier-a { background: linear-gradient(90deg, #F44336, #E91E63); }
        .tier-b { background: linear-gradient(90deg, #9C27B0, #673AB7); }
        .tier-c { background: linear-gradient(90deg, #2196F3, #03A9F4); }
        .tier-d { background: linear-gradient(90deg, #4CAF50, #8BC34A); }
        .tier-f { background: linear-gradient(90deg, #607D8B, #78909C); }
        .tier-body {
            padding: 20px;
        }
        .tier-body ul {
            list-style: none;
        }
        .tier-body li {
            padding: 8px 0;
            border-bottom: 1px dotted #ddd;
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .tier-body li:last-child {
            border-bottom: none;
        }
        .tier-body i {
            color: var(--ac-yellow);
        }
        .featured-image {
            margin: 40px auto;
            text-align: center;
        }
        .featured-image img {
            border-radius: 15px;
            box-shadow: 0 10px 30px rgba(0,0,0,0.2);
            max-width: 900px;
            margin: 0 auto;
        }
        .image-caption {
            font-style: italic;
            color: var(--ac-gray);
            margin-top: 10px;
            font-size: 0.95rem;
        }
        .interactive-section {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin: 60px 0;
        }
        .form-box {
            background-color: #F9F9F9;
            border-radius: 10px;
            padding: 25px;
            box-shadow: var(--shadow);
        }
        .form-box h3 {
            margin-bottom: 20px;
            color: var(--ac-dark-green);
            display: flex;
            align-items: center;
            gap: 10px;
        }
        .form-box input,
        .form-box textarea,
        .form-box select {
            width: 100%;
            padding: 12px 15px;
            margin-bottom: 15px;
            border: 1px solid #ccc;
            border-radius: 6px;
            font-size: 1rem;
            transition: border 0.3s;
        }
        .form-box input:focus,
        .form-box textarea:focus,
        .form-box select:focus {
            outline: none;
            border-color: var(--ac-green);
        }
        .form-box button {
            background-color: var(--ac-dark-green);
            color: white;
            border: none;
            padding: 14px 25px;
            border-radius: 6px;
            cursor: pointer;
            font-size: 1rem;
            font-weight: 600;
            transition: background-color 0.3s;
            width: 100%;
        }
        .form-box button:hover {
            background-color: var(--ac-brown);
        }
        .star-rating {
            display: flex;
            justify-content: center;
            gap: 10px;
            margin: 15px 0;
            direction: rtl;
        }
        .star-rating input {
            display: none;
        }
        .star-rating label {
            font-size: 2rem;
            color: #ddd;
            cursor: pointer;
            transition: color 0.2s;
        }
        .star-rating input:checked ~ label,
        .star-rating label:hover,
        .star-rating label:hover ~ label {
            color: var(--ac-yellow);
        }
        .web-links {
            background-color: #2E7D32;
            padding: 40px 0;
            margin-top: 60px;
        }
        .web-links .container {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 20px;
        }
        .web-link {
            background-color: rgba(255,255,255,0.1);
            padding: 15px;
            border-radius: 8px;
            transition: background-color 0.3s;
        }
        .web-link:hover {
            background-color: rgba(255,255,255,0.2);
        }
        .web-link a {
            color: var(--ac-light);
            font-weight: 500;
            display: block;
        }
        footer {
            background-color: #1B5E20;
            color: var(--ac-white);
            padding: 40px 0 20px;
            text-align: center;
        }
        .footer-content {
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 20px;
        }
        .copyright {
            font-size: 0.9rem;
            color: #C8E6C9;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
            width: 100%;
        }
        @media (max-width: 992px) {
            .article-header h1 { font-size: 2.4rem; }
            .tier-grid { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 768px) {
            .hamburger { display: block; }
            .nav-links {
                position: fixed;
                top: 80px;
                right: -100%;
                flex-direction: column;
                background-color: var(--ac-white);
                width: 70%;
                height: calc(100vh - 80px);
                transition: 0.5s;
                box-shadow: -5px 0 15px rgba(0,0,0,0.1);
                padding-top: 30px;
                z-index: 999;
            }
            .nav-links.active { right: 0; }
            .nav-links li {
                margin: 15px 0;
                text-align: center;
            }
            .article-content { padding: 0 20px; }
            .tier-grid { grid-template-columns: 1fr; }
            .interactive-section { grid-template-columns: 1fr; }
            .web-links .container { grid-template-columns: repeat(2, 1fr); }
        }
        @media (max-width: 576px) {
            .article-header h1 { font-size: 2rem; }
            .article-content h2 { font-size: 1.7rem; }
            .web-links .container { grid-template-columns: 1fr; }
            .article-meta { flex-direction: column; gap: 10px; }
        }