:root {
            --primary-blue: #2B8B9E;
            --light-blue: #7BBFCC;
            --pale-blue: #E8F4F6;
            --white: #FFFFFF;
            --dark-text: #2C3E50;
            --success: #27AE60;
            --error: #E74C3C;
            --warning: #F39C12;
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }

        body {
            font-family: 'Open Sans', sans-serif;
            background: linear-gradient(135deg, var(--pale-blue) 0%, var(--white) 50%, var(--pale-blue) 100%);
            min-height: 100vh;
            color: var(--dark-text);
            line-height: 1.7;
        }

        .container { max-width: 900px; margin: 0 auto; padding: 20px; }

        .welcome-screen {
            background: var(--white);
            border-radius: 20px;
            padding: 50px 40px;
            text-align: center;
            box-shadow: 0 4px 30px rgba(43, 139, 158, 0.15);
            animation: fadeInUp 0.6s ease;
        }

        @keyframes fadeInUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .welcome-screen h1 {
            font-family: 'Lora', serif;
            font-size: 2.2rem;
            color: var(--primary-blue);
            margin-bottom: 10px;
        }

        .welcome-screen .subtitle {
            color: var(--light-blue);
            font-size: 1.1rem;
            margin-bottom: 40px;
        }

        .welcome-form { max-width: 400px; margin: 0 auto; }

        .form-group { text-align: left; margin-bottom: 25px; }

        .form-group label {
            display: block;
            font-weight: 600;
            color: var(--primary-blue);
            margin-bottom: 8px;
        }

        .form-group input {
            width: 100%;
            padding: 15px 20px;
            border: 2px solid var(--pale-blue);
            border-radius: 10px;
            font-size: 1rem;
            font-family: 'Open Sans', sans-serif;
        }

        .form-group input:focus {
            outline: none;
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 3px rgba(43, 139, 158, 0.1);
        }

        .welcome-features {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 20px;
            margin: 40px 0;
        }

        .welcome-feature {
            padding: 20px;
            background: var(--pale-blue);
            border-radius: 12px;
            text-align: center;
        }

        .welcome-feature-icon { font-size: 2rem; margin-bottom: 10px; }
        .welcome-feature h4 { color: var(--primary-blue); font-size: 0.95rem; margin-bottom: 5px; }
        .welcome-feature p { font-size: 0.85rem; opacity: 0.8; }

        .header {
            text-align: center;
            padding: 30px 20px;
            background: var(--white);
            border-radius: 20px;
            margin-bottom: 25px;
            box-shadow: 0 4px 20px rgba(43, 139, 158, 0.1);
        }

        .logo-text {
            font-family: 'Lora', serif;
            font-size: 0.9rem;
            color: var(--primary-blue);
            letter-spacing: 2px;
        }

        .header h1 {
            font-family: 'Lora', serif;
            font-size: 1.8rem;
            color: var(--primary-blue);
            margin: 10px 0 5px;
        }

        .header p { color: var(--light-blue); }

        .user-greeting {
            background: var(--pale-blue);
            display: inline-block;
            padding: 8px 20px;
            border-radius: 20px;
            margin-top: 10px;
            font-weight: 500;
            color: var(--primary-blue);
        }

        .progress-container {
            background: var(--white);
            border-radius: 15px;
            padding: 18px 25px;
            margin-bottom: 25px;
            box-shadow: 0 4px 20px rgba(43, 139, 158, 0.1);
        }

        .progress-header { display: flex; justify-content: space-between; margin-bottom: 10px; }
        .progress-label { font-weight: 600; color: var(--primary-blue); font-size: 0.9rem; }

        .progress-bar {
            height: 10px;
            background: var(--pale-blue);
            border-radius: 10px;
            overflow: hidden;
        }

        .progress-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--light-blue), var(--primary-blue));
            border-radius: 10px;
            transition: width 0.5s ease;
        }

        .nav-tabs {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
            background: var(--white);
            padding: 12px;
            border-radius: 15px;
            margin-bottom: 25px;
            box-shadow: 0 4px 20px rgba(43, 139, 158, 0.1);
        }

        .nav-tab {
            flex: 1;
            min-width: 90px;
            padding: 10px 8px;
            background: var(--pale-blue);
            border: none;
            border-radius: 10px;
            cursor: pointer;
            font-family: 'Open Sans', sans-serif;
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--primary-blue);
            transition: all 0.3s ease;
            text-align: center;
            position: relative;
        }

        .nav-tab:hover { background: var(--light-blue); color: var(--white); }
        .nav-tab.active { background: var(--primary-blue); color: var(--white); }

        .nav-tab.completed::after {
            content: '✓';
            position: absolute;
            top: -6px;
            right: -6px;
            background: var(--success);
            color: white;
            width: 18px;
            height: 18px;
            border-radius: 50%;
            font-size: 11px;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .content-section {
            background: var(--white);
            border-radius: 20px;
            padding: 35px;
            margin-bottom: 25px;
            box-shadow: 0 4px 20px rgba(43, 139, 158, 0.1);
            display: none;
            animation: fadeIn 0.5s ease;
        }

        .content-section.active { display: block; }

        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(10px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .content-section h2 {
            font-family: 'Lora', serif;
            font-size: 1.5rem;
            color: var(--primary-blue);
            margin-bottom: 20px;
            padding-bottom: 15px;
            border-bottom: 3px solid var(--pale-blue);
        }

        .content-section h3 {
            font-family: 'Lora', serif;
            font-size: 1.15rem;
            color: var(--primary-blue);
            margin: 22px 0 12px;
        }

        .content-section p { margin-bottom: 12px; }

        .benefit-box {
            background: linear-gradient(135deg, var(--pale-blue) 0%, #D4EEF2 100%);
            border-radius: 15px;
            padding: 18px;
            margin: 18px 0;
            border-left: 5px solid var(--primary-blue);
        }

        .benefit-box h4 { color: var(--primary-blue); margin-bottom: 8px; font-size: 1rem; }

        .info-box {
            background: var(--pale-blue);
            border-left: 4px solid var(--primary-blue);
            padding: 15px;
            border-radius: 0 12px 12px 0;
            margin: 18px 0;
        }

        .info-box.warning { background: #FFF9E6; border-left-color: var(--warning); }
        .info-box.success { background: #E8F8F0; border-left-color: var(--success); }
        .info-box.error { background: #FDEDED; border-left-color: var(--error); }

        .info-box-title { font-weight: 600; color: var(--primary-blue); margin-bottom: 6px; font-size: 0.95rem; }
        .info-box.warning .info-box-title { color: var(--warning); }
        .info-box.error .info-box-title { color: var(--error); }

        .key-point {
            display: flex;
            align-items: flex-start;
            gap: 12px;
            padding: 12px;
            background: linear-gradient(135deg, var(--pale-blue) 0%, #E0F3F6 100%);
            border-radius: 10px;
            margin: 10px 0;
        }

        .key-point:hover { transform: translateX(5px); }

        .key-point-icon {
            width: 36px;
            height: 36px;
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1rem;
            flex-shrink: 0;
        }

        .key-point-content strong { color: var(--primary-blue); }

        .script-box {
            background: linear-gradient(135deg, var(--pale-blue) 0%, #D4EEF2 100%);
            border-radius: 12px;
            padding: 18px;
            margin: 18px 0;
            border: 2px solid var(--light-blue);
            position: relative;
        }

        .script-box::before {
            content: '"';
            font-family: 'Lora', serif;
            font-size: 3rem;
            color: var(--light-blue);
            position: absolute;
            top: 5px;
            left: 12px;
            opacity: 0.5;
        }

        .script-box p { font-style: italic; padding-left: 30px; font-size: 0.95rem; }

        .script-label {
            font-size: 0.75rem;
            font-weight: 600;
            color: var(--primary-blue);
            text-transform: uppercase;
            letter-spacing: 1px;
            margin-bottom: 6px;
        }

        .checklist { list-style: none; margin-left: 0; }

        .checklist li {
            display: flex;
            align-items: flex-start;
            gap: 10px;
            padding: 8px 12px;
            background: var(--pale-blue);
            border-radius: 8px;
            margin-bottom: 6px;
            font-size: 0.9rem;
        }

        .checklist li:hover { transform: translateX(5px); }

        .checklist-icon {
            width: 20px;
            height: 20px;
            background: var(--primary-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 10px;
            flex-shrink: 0;
        }

        .checklist-icon.warning { background: var(--warning); }
        .checklist-icon.error { background: var(--error); }

        .nav-buttons {
            display: flex;
            justify-content: space-between;
            gap: 15px;
            margin-top: 25px;
            padding-top: 18px;
            border-top: 2px solid var(--pale-blue);
        }

        .btn {
            padding: 12px 25px;
            border: none;
            border-radius: 10px;
            cursor: pointer;
            font-family: 'Open Sans', sans-serif;
            font-size: 0.95rem;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            color: var(--white);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: 0 4px 15px rgba(43, 139, 158, 0.4);
        }

        .btn-secondary { background: var(--pale-blue); color: var(--primary-blue); }
        .btn-secondary:hover { background: var(--light-blue); color: var(--white); }
        .btn:disabled { opacity: 0.5; cursor: not-allowed; }
        .btn-large { font-size: 1.1rem; padding: 16px 40px; }

        .modality-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 10px;
            margin: 15px 0;
        }

        .modality-card {
            background: var(--pale-blue);
            border-radius: 10px;
            padding: 12px;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .modality-card:hover { transform: translateY(-2px); }
        .modality-icon { font-size: 1.5rem; }
        .modality-card h5 { color: var(--primary-blue); font-size: 0.85rem; margin: 0; }
        .modality-card p { font-size: 0.75rem; margin: 0; opacity: 0.8; }

        .phase-timeline {
            position: relative;
            padding-left: 30px;
            margin: 15px 0;
        }

        .phase-timeline::before {
            content: '';
            position: absolute;
            left: 8px;
            top: 0;
            bottom: 0;
            width: 3px;
            background: linear-gradient(to bottom, var(--light-blue), var(--primary-blue));
            border-radius: 3px;
        }

        .phase-item {
            position: relative;
            padding: 10px 15px;
            background: var(--pale-blue);
            border-radius: 10px;
            margin-bottom: 10px;
        }

        .phase-item::before {
            content: '';
            position: absolute;
            left: -26px;
            top: 15px;
            width: 12px;
            height: 12px;
            background: var(--primary-blue);
            border-radius: 50%;
            border: 3px solid var(--white);
        }

        .phase-item h5 { color: var(--primary-blue); font-size: 0.9rem; margin-bottom: 4px; }
        .phase-item p { font-size: 0.85rem; margin: 0; }

        .quick-ref-card {
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            border-radius: 12px;
            padding: 18px;
            color: white;
            margin: 18px 0;
        }

        .quick-ref-card h4 { font-family: 'Lora', serif; font-size: 1rem; margin-bottom: 10px; }
        .quick-ref-card ul { list-style: none; margin: 0; font-size: 0.9rem; }
        .quick-ref-card li { padding: 5px 0; border-bottom: 1px solid rgba(255,255,255,0.2); }
        .quick-ref-card li:last-child { border-bottom: none; }

        .expandable { margin: 10px 0; }

        .expandable-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 10px 15px;
            background: var(--pale-blue);
            border-radius: 8px;
            cursor: pointer;
        }

        .expandable-header:hover { background: #D4EEF2; }
        .expandable-header h4 { color: var(--primary-blue); font-size: 0.9rem; }
        .expandable-icon { color: var(--primary-blue); transition: transform 0.3s ease; }
        .expandable.open .expandable-icon { transform: rotate(180deg); }

        .expandable-content {
            display: none;
            padding: 12px;
            background: var(--white);
            border: 1px solid var(--pale-blue);
            border-top: none;
            border-radius: 0 0 8px 8px;
            font-size: 0.9rem;
        }

        .expandable.open .expandable-content { display: block; }

        .info-table {
            width: 100%;
            border-collapse: collapse;
            margin: 12px 0;
            border-radius: 10px;
            overflow: hidden;
            font-size: 0.85rem;
        }

        .info-table th, .info-table td {
            padding: 10px;
            text-align: left;
            border-bottom: 1px solid var(--pale-blue);
        }

        .info-table th { background: var(--primary-blue); color: var(--white); font-size: 0.8rem; }
        .info-table tr:nth-child(even) { background: var(--pale-blue); }

        .quiz-question {
            background: var(--pale-blue);
            border-radius: 12px;
            padding: 18px;
            margin-bottom: 18px;
        }

        .question-number { font-size: 0.75rem; font-weight: 600; color: var(--light-blue); margin-bottom: 6px; }
        .question-text { font-size: 0.95rem; font-weight: 500; margin-bottom: 12px; }
        .quiz-options { display: flex; flex-direction: column; gap: 8px; }

        .quiz-option {
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 10px 12px;
            background: var(--white);
            border: 2px solid transparent;
            border-radius: 8px;
            cursor: pointer;
            font-size: 0.9rem;
        }

        .quiz-option:hover { border-color: var(--light-blue); transform: translateX(5px); }
        .quiz-option.selected { border-color: var(--primary-blue); background: #E8F4F6; }
        .quiz-option.correct { border-color: var(--success); background: #E8F8F0; }
        .quiz-option.incorrect { border-color: var(--error); background: #FDEDED; }

        .option-letter {
            width: 26px;
            height: 26px;
            background: var(--pale-blue);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: 600;
            font-size: 0.8rem;
            color: var(--primary-blue);
            flex-shrink: 0;
        }

        .quiz-option.selected .option-letter { background: var(--primary-blue); color: var(--white); }
        .quiz-option.correct .option-letter { background: var(--success); color: var(--white); }
        .quiz-option.incorrect .option-letter { background: var(--error); color: var(--white); }

        .results-container { text-align: center; padding: 20px; }
        .results-score { font-family: 'Lora', serif; font-size: 3.5rem; font-weight: 600; margin: 15px 0; }
        .results-score.pass { color: var(--success); }
        .results-score.fail { color: var(--error); }

        .results-details {
            background: var(--pale-blue);
            border-radius: 12px;
            padding: 18px;
            margin: 18px 0;
            text-align: left;
        }

        .certificate {
            background: linear-gradient(135deg, #FFFFFF 0%, var(--pale-blue) 100%);
            border: 4px solid var(--primary-blue);
            border-radius: 20px;
            padding: 35px 25px;
            margin: 20px 0;
            text-align: center;
        }

        .certificate-badge {
            width: 65px;
            height: 65px;
            background: linear-gradient(135deg, var(--primary-blue), var(--light-blue));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin: 0 auto 12px;
            font-size: 1.8rem;
            color: white;
        }

        .certificate h3 {
            font-family: 'Lora', serif;
            font-size: 1.3rem;
            color: var(--primary-blue);
            margin-bottom: 18px;
            letter-spacing: 2px;
        }

        .certificate .cert-name {
            font-family: 'Lora', serif;
            font-size: 1.6rem;
            color: var(--primary-blue);
            margin: 8px 0 18px;
            padding-bottom: 8px;
            border-bottom: 2px solid var(--light-blue);
            display: inline-block;
        }

        .certificate .cert-score {
            display: inline-block;
            background: var(--success);
            color: white;
            padding: 5px 15px;
            border-radius: 15px;
            font-weight: 600;
            font-size: 0.9rem;
            margin-top: 10px;
        }

        .print-btn {
            background: var(--white);
            border: 2px solid var(--primary-blue);
            color: var(--primary-blue);
            padding: 10px 22px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            margin-top: 12px;
            font-size: 0.9rem;
        }

        .print-btn:hover { background: var(--primary-blue); color: var(--white); }

        @media print { .no-print { display: none !important; } }

        @media (max-width: 768px) {
            .container { padding: 15px; }
            .welcome-features, .modality-grid { grid-template-columns: 1fr; }
            .nav-tabs, .nav-buttons { flex-direction: column; }
            .btn, .nav-tab { width: 100%; min-width: 100%; }
            .content-section { padding: 25px 18px; }
        }

        .main-content { display: none; }
        .main-content.active { display: block; }