/* Quiz Pro Modern Styles */

:root {
    --primary-color: #6c63ff;
    --primary-dark: #5a52d5;
    --bg-color: #f0f2f5;
    --card-bg: #ffffff;
    --text-main: #2d3436;
    --text-muted: #636e72;
    --success-color: #00b894;
    --error-color: #d63031;
    --warning-color: #fdcb6e;
    --border-radius: 16px;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
    --transition: all 0.3s ease;
    --input-bg: #ffffff;
    --input-border: #e0e0e0;
    --category-bg: #f8f9fa;
    --option-bg: #ffffff;
    --option-label-bg: #f0f2f5;
}

body.dark-mode {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-main: #e0e0e0;
    --text-muted: #b0b0b0;
    --primary-color: #8e85ff;
    --primary-dark: #7a71e6;
    --shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
    --input-bg: #2d2d2d;
    --input-border: #404040;
    --category-bg: #2d2d2d;
    --option-bg: #2d2d2d;
    --option-label-bg: #3d3d3d;
}

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

body {
    font-family: 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 20px;
    transition: background-color 0.3s, color 0.3s;
}

#app {
    width: 100%;
    max-width: 520px;
}

.container {
    width: 100%;
    animation: fadeIn 0.5s ease-out;
}

/* Theme Toggle */
.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--card-bg);
    border: 1px solid var(--input-border);
    box-shadow: var(--shadow);
    cursor: pointer;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.2rem;
    z-index: 1000;
    transition: var(--transition);
}

.theme-toggle:hover {
    transform: scale(1.1);
}

/* Typography */
.text-center { text-align: center; }
.main-title {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
    font-weight: 800;
}
.subtitle {
    color: var(--text-muted);
    margin-bottom: 2rem;
}
.section-label {
    display: block;
    font-weight: 600;
    margin-bottom: 0.8rem;
    color: var(--text-main);
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Cards */
.card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--shadow);
    margin-bottom: 1.5rem;
    border: 1px solid var(--input-border);
    transition: background-color 0.3s, border-color 0.3s;
}

/* Buttons */
.btn {
    display: inline-block;
    font-weight: 600;
    text-align: center;
    vertical-align: middle;
    cursor: pointer;
    padding: 0.8rem 1.5rem;
    font-size: 1rem;
    border-radius: 12px;
    transition: var(--transition);
    border: none;
    outline: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(108, 99, 255, 0.3);
}

.btn-primary:active {
    transform: translateY(0);
}

.btn-block {
    display: block;
    width: 100%;
}

.btn-lg {
    padding: 1.2rem;
    font-size: 1.1rem;
}

.btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
    transform: none;
    box-shadow: none;
}

/* Form Elements */
.form-group {
    margin-bottom: 1.5rem;
}

.form-row {
    display: flex;
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.flex-1 { flex: 1; }

.form-control {
    width: 100%;
    padding: 0.8rem 1rem;
    border-radius: 10px;
    border: 2px solid var(--input-border);
    font-size: 1rem;
    transition: var(--transition);
    background-color: var(--input-bg);
    color: var(--text-main);
}

.form-control:focus {
    border-color: var(--primary-color);
    outline: none;
}

/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.8rem;
}

.category-card {
    background: var(--category-bg);
    border: 2px solid var(--input-border);
    border-radius: 12px;
    padding: 1rem 0.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-main);
}

.category-card:hover {
    border-color: var(--primary-color);
    background: var(--option-label-bg);
}

.category-card.active {
    border-color: var(--primary-color);
    background: var(--option-label-bg);
    transform: scale(1.05);
}

/* Language Grid */
.language-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 0.5rem;
}

.language-card {
    background: var(--category-bg);
    border: 2px solid var(--input-border);
    border-radius: 10px;
    padding: 0.6rem 0.2rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.3rem;
    color: var(--text-main);
}

.language-card:hover {
    border-color: var(--primary-color);
    background: var(--option-label-bg);
}

.language-card.active {
    border-color: var(--primary-color);
    background: var(--option-label-bg);
    transform: scale(1.05);
}

.lang-flag-img {
    margin-bottom: 0.1rem;
    border-radius: 2px;
    box-shadow: 0 1px 3px rgba(0,0,0,0.1);
}

.lang-name {
    font-size: 0.75rem;
    font-weight: 700;
}

/* Quiz Header & Progress */
.quiz-header {
    margin-bottom: 1.5rem;
}

.progress-wrapper {
    height: 10px;
    background-color: var(--input-border);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.progress-bar {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), #a29bfe);
    width: 0%;
    transition: width 0.4s ease;
}

.quiz-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.badge {
    padding: 0.4rem 0.8rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
}

.category-badge {
    background-color: var(--option-label-bg);
    color: var(--primary-color);
}

.question-counter {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* Question Card */
.question-text {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    line-height: 1.4;
    color: var(--text-main);
}

.options-grid {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.option-btn {
    display: flex;
    align-items: center;
    padding: 1rem;
    background: var(--option-bg);
    border: 2px solid var(--input-border);
    border-radius: 12px;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
    width: 100%;
    color: var(--text-main);
}

.option-btn:hover:not(:disabled) {
    border-color: var(--primary-color);
    background-color: var(--option-label-bg);
}

.option-label {
    width: 32px;
    height: 32px;
    background-color: var(--option-label-bg);
    border-radius: 8px;
    display: flex;
    justify-content: center;
    align-items: center;
    font-weight: 700;
    margin-right: 1rem;
    color: var(--text-muted);
    transition: var(--transition);
}

.option-text {
    flex: 1;
    font-weight: 500;
    font-size: 1rem;
}

/* Option States */
.option-btn.correct {
    border-color: var(--success-color);
    background-color: rgba(0, 184, 148, 0.1);
}
.option-btn.correct .option-label {
    background-color: var(--success-color);
    color: white;
}

.option-btn.incorrect {
    border-color: var(--error-color);
    background-color: rgba(214, 48, 49, 0.1);
}
.option-btn.incorrect .option-label {
    background-color: var(--error-color);
    color: white;
}

.option-btn.locked {
    cursor: default;
}

/* Quiz Footer */
.quiz-footer {
    display: flex;
    justify-content: center;
    margin-top: 1rem;
}

.score-badge {
    background: var(--card-bg);
    padding: 0.6rem 1.2rem;
    border-radius: 30px;
    box-shadow: var(--shadow);
    font-weight: 600;
    color: var(--text-main);
}

/* Result Card */
.result-card {
    padding: 0;
    overflow: hidden;
}

.result-header {
    padding: 3rem 2rem;
    color: white;
}

.result-header.success-high { background: linear-gradient(135deg, #00b894, #55efc4); }
.result-header.success-mid { background: linear-gradient(135deg, #6c63ff, #a29bfe); }
.result-header.success-low { background: linear-gradient(135deg, #fdcb6e, #ffeaa7); }

.result-icon {
    font-size: 4rem;
    margin-bottom: 1rem;
}

.result-body {
    padding: 2rem;
}

.score-circle {
    width: 120px;
    height: 120px;
    border: 8px solid var(--option-label-bg);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

.score-value {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
}

.score-value span {
    font-size: 1rem;
    color: var(--text-muted);
}

.score-label {
    font-size: 0.7rem;
    text-transform: uppercase;
    font-weight: 700;
    color: var(--text-muted);
}

.percentage-bar-container {
    margin-bottom: 2rem;
}

.percentage-label {
    font-weight: 600;
    margin-bottom: 0.5rem;
    font-size: 0.9rem;
    color: var(--text-main);
}

.percentage-bar {
    height: 12px;
    background-color: var(--option-label-bg);
    border-radius: 6px;
    overflow: hidden;
}

.percentage-fill {
    height: 100%;
    transition: width 1s ease-out;
}

.percentage-fill.success-high { background-color: var(--success-color); }
.percentage-fill.success-mid { background-color: var(--primary-color); }
.percentage-fill.success-low { background-color: var(--warning-color); }

.result-message {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-main);
}

.result-actions {
    padding: 0 2rem 2rem;
}

/* History Card */
.history-card {
    padding: 1.5rem;
}

.card-header h3 {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-main);
}

.history-list {
    list-style: none;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
    border-bottom: 1px solid var(--input-border);
}

.history-item:last-child {
    border-bottom: none;
}

.history-info {
    display: flex;
    flex-direction: column;
}

.history-category {
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-main);
}

.history-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.history-score-box {
    background: var(--option-label-bg);
    padding: 0.4rem 0.8rem;
    border-radius: 8px;
}

.history-score {
    font-weight: 700;
    color: var(--primary-color);
}

.empty-history {
    text-align: center;
    color: var(--text-muted);
    padding: 1rem 0;
    font-style: italic;
}

/* Loading Spinner */
.spinner-container {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 4rem 0;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 5px solid rgba(108, 99, 255, 0.1);
    border-top: 5px solid var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin-bottom: 1.5rem;
}

.loading-text {
    font-weight: 600;
    color: var(--primary-color);
}

.sub-status {
    font-size: 0.85rem;
    color: var(--text-muted);
    margin-top: 0.5rem;
    font-style: italic;
}

/* Error Card */
.error-card {
    border-top: 5px solid var(--error-color);
}

.error-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

/* Animations */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

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

.animate-fade-in {
    animation: fadeIn 0.5s ease-out forwards;
}

.hidden {
    display: none !important;
}

/* Responsive */
@media (max-width: 480px) {
    body {
        padding: 10px;
    }
    
    .card {
        padding: 1.5rem;
    }
    
    .main-title {
        font-size: 2rem;
    }
    
    .category-grid {
        grid-template-columns: 1fr;
    }
    
    .category-card {
        flex-direction: row;
        padding: 0.8rem 1.5rem;
        justify-content: flex-start;
        gap: 1.5rem;
    }
    
    .category-icon {
        font-size: 1.2rem;
    }
    
    .category-name {
        font-size: 1rem;
    }
    
    .form-row {
        flex-direction: column;
    }

    .theme-toggle {
        top: 10px;
        right: 10px;
        width: 40px;
        height: 40px;
    }
}