:root {
            --bg-color: #121212;
            --card-bg: #1e1e1e;
            --text-main: #ffffff;
            --text-muted: #a0a0a0;
            --primary: #6366f1;
            --primary-hover: #4f46e5;
            --danger: #ef4444;
            --warning: #f59e0b;
            --success: #10b981;
            --border: #333333;
        }
        body {
            
        }
        .container {
            width: 100%;
            
            margin-top: 40px;
            font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
            background-color: var(--bg-color);
            color: var(--text-main);
            margin: 0;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
            min-height: 100vh;
        }
        h1, h2 {
            text-align: center;
        }
        h1 {
            font-size: 1.8rem;
            margin-bottom: 0.5rem;
        }
        h2 {
            font-size: 1.2rem;
            color: var(--text-muted);
            font-weight: 400;
            margin-bottom: 2rem;
        }
        .card {
            background-color: var(--card-bg);
            border-radius: 16px;
            padding: 24px;
            margin-bottom: 20px;
            box-shadow: 0 10px 15px -3px rgba(0,0,0,0.5);
            border: 1px solid var(--border);
        }
        .card h3 {
            margin-top: 0;
            margin-bottom: 20px;
            font-size: 1.4rem;
            border-bottom: 1px solid var(--border);
            padding-bottom: 10px;
        }
        .form-group {
            margin-bottom: 16px;
        }
        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 500;
            color: #d1d5db;
        }
        input[type="number"], input[type="text"], select {
            width: 100%;
            padding: 14px;
            border-radius: 10px;
            border: 1px solid var(--border);
            background-color: #2a2a2a;
            color: white;
            box-sizing: border-box;
            font-size: 16px;
            transition: border-color 0.2s;
        }
        select {
            appearance: none;
            background-image: url("data:image/svg+xml;charset=US-ASCII,%3Csvg%20xmlns%3D%22http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%22%20width%3D%22292.4%22%20height%3D%22292.4%22%3E%3Cpath%20fill%3D%22%23ffffff%22%20d%3D%22M287%2069.4a17.6%2017.6%200%200%200-13-5.4H18.4c-5%200-9.3%201.8-12.9%205.4A17.6%2017.6%200%200%200%200%2082.2c0%205%201.8%209.3%205.4%2012.9l128%20127.9c3.6%203.6%207.8%205.4%2012.8%205.4s9.2-1.8%2012.8-5.4L287%2095c3.5-3.5%205.4-7.8%205.4-12.8%200-5-1.9-9.2-5.5-12.8z%22%2F%3E%3C%2Fsvg%3E");
            background-repeat: no-repeat;
            background-position: right 14px top 50%;
            background-size: 12px auto;
            padding-right: 40px;
        }
        input:focus, select:focus {
            outline: none;
            border-color: var(--primary);
        }
        .row-flex {
            display: flex;
            gap: 12px;
            align-items: center;
        }
        .row-flex > div {
            flex: 1;
        }
        .btn {
            background-color: var(--primary);
            color: white;
            border: none;
            padding: 14px 20px;
            border-radius: 10px;
            cursor: pointer;
            font-size: 16px;
            font-weight: 600;
            width: 100%;
            transition: background-color 0.2s, transform 0.1s;
        }
        .btn:hover {
            background-color: var(--primary-hover);
        }
        .btn:active {
            transform: scale(0.98);
        }
        .btn-outline {
            background-color: transparent;
            border: 2px dashed var(--primary);
            color: var(--primary);
            margin-top: 10px;
        }
        .btn-outline:hover {
            background-color: rgba(99, 102, 241, 0.1);
        }
        .assessment-row {
            background-color: #252525;
            padding: 16px;
            border-radius: 12px;
            margin-bottom: 12px;
            position: relative;
            border: 1px solid #333;
        }
        .remove-btn {
            position: absolute;
            top: 12px;
            right: 12px;
            background: rgba(239, 68, 68, 0.1);
            border: none;
            color: var(--danger);
            cursor: pointer;
            font-size: 20px;
            width: 32px;
            height: 32px;
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.2s;
        }
        .remove-btn:hover {
            background: rgba(239, 68, 68, 0.2);
        }
        .validation-msg {
            font-size: 14px;
            margin-top: 8px;
            display: none;
            padding: 10px;
            border-radius: 8px;
            background: rgba(245, 158, 11, 0.1);
        }
        .text-danger { color: var(--danger); }
        .text-success { color: var(--success); }
        .text-warning { color: var(--warning); }
        
        .progress-container {
            display: flex;
            justify-content: center;
            margin: 30px 0;
        }
        .circular-progress {
            position: relative;
            width: 140px;
            height: 140px;
            border-radius: 50%;
            background: conic-gradient(var(--border) 360deg);
            display: flex;
            align-items: center;
            justify-content: center;
            transition: background 0.5s ease-in-out;
        }
        .circular-progress::before {
            content: "";
            position: absolute;
            width: 116px;
            height: 116px;
            border-radius: 50%;
            background-color: var(--card-bg);
        }
        .progress-value {
            position: relative;
            font-size: 28px;
            font-weight: bold;
        }
        .result-box {
            text-align: center;
            margin-top: 20px;
        }
        .result-box p {
            font-size: 1.1rem;
            margin: 10px 0;
            color: #d1d5db;
        }
        .result-box strong {
            color: white;
            font-size: 1.3rem;
        }
        .motivational-msg {
            font-size: 1.2rem;
            font-weight: bold;
            margin: 24px 0;
            padding: 16px;
            border-radius: 12px;
            background: rgba(255,255,255,0.05);
        }
        .hidden {
            display: none !important;
        }


        .container-article {
            max-width: 1200px;
            margin: 0 auto;
        }
        /* header-grade */
        .header-grade {
            text-align: center;
            margin-bottom: 48px;
        }
        .header-grade h2 {
            font-size: 2.5rem;
            background: linear-gradient(135deg, #818cf8, #c084fc);
            -webkit-background-clip: text;
            background-clip: text;
            color: transparent;
            margin-bottom: 12px;
        }
        .header-grade p {
            font-size: 1.2rem;
            color: #94a3b8;
            max-width: 700px;
            margin: 0 auto;
        }
        /* Grid layout */
        .grid-2 {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 32px;
            margin-bottom: 48px;
        }
        @media (max-width: 768px) {
            .grid-2 {
                grid-template-columns: 1fr;
                gap: 24px;
            }
        }
        /* Cards */
        .card {
            background: rgba(30, 41, 59, 0.7);
            backdrop-filter: blur(4px);
            border-radius: 28px;
            padding: 28px;
            border: 1px solid rgba(99, 102, 241, 0.3);
            transition: transform 0.2s, border-color 0.2s;
        }
        .card:hover {
            border-color: #6366f1;
            transform: translateY(-4px);
        }
        .card h2 {
            font-size: 1.75rem;
            margin-bottom: 20px;
            display: flex;
            align-items: center;
            gap: 12px;
            border-left: 4px solid #6366f1;
            padding-left: 16px;
        }
        .card h3 {
            font-size: 1.3rem;
            margin: 24px 0 12px 0;
            color: #c7d2fe;
        }
        .card h4 {
            font-size: 1.1rem;
            margin: 16px 0 8px 0;
            color: #a5b4fc;
        }
        .card p, .card li {
            color: #cbd5e1;
            margin-bottom: 12px;
        }
        .card ul, .card ol {
            padding-left: 24px;
            margin: 16px 0;
        }
        .card li {
            margin-bottom: 8px;
        }
        /* Step indicator */
        .step {
            display: inline-block;
            background: #6366f1;
            color: white;
            font-weight: bold;
            width: 28px;
            height: 28px;
            text-align: center;
            line-height: 28px;
            border-radius: 50%;
            font-size: 0.9rem;
            margin-right: 12px;
        }
        .tip {
            background: rgba(16, 185, 129, 0.15);
            border-left: 4px solid #10b981;
            padding: 16px 20px;
            border-radius: 16px;
            margin: 20px 0;
        }
        .warning-tip {
            background: rgba(245, 158, 11, 0.15);
            border-left-color: #f59e0b;
        }
        .example {
            background: rgba(99, 102, 241, 0.1);
            border-radius: 20px;
            padding: 20px;
            font-family: monospace;
            font-size: 0.95rem;
            margin: 16px 0;
            border: 1px solid #334155;
        }
        .badge {
            display: inline-block;
            background: #334155;
            padding: 4px 12px;
            border-radius: 40px;
            font-size: 0.75rem;
            color: #94a3b8;
            margin-right: 8px;
        }
        hr {
            border-color: #334155;
            margin: 32px 0;
        }
        .footer-note {
            text-align: center;
            margin-top: 48px;
            padding-top: 24px;
            border-top: 1px solid #334155;
            color: #64748b;
            font-size: 0.85rem;
        }
        .highlight {
            color: #a5b4fc;
            font-weight: 600;
        }
        .motivation-box {
            background: linear-gradient(145deg, #1e293b, #0f172a);
            border-radius: 24px;
            padding: 28px;
            text-align: center;
            margin-top: 20px;
        }
        .motivation-box p {
            font-size: 1.1rem;
            font-style: italic;
        }
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px);}
            to { opacity: 1; transform: translateY(0);}
        }
        .card {
            animation: fadeIn 0.4s ease-out;
        }