/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@300;400;500;600;700;800&family=Plus+Jakarta+Sans:wght@300;400;500;600;700;800&display=swap');

/* CSS Reset & Variables */
:root {
    --font-heading: 'Outfit', sans-serif;
    --font-body: 'Plus Jakarta Sans', sans-serif;

    /* Theme Colors (Indigo Dark Theme) */
    --bg-main: #0b0f19;
    --bg-card: #151c2c;
    --bg-card-hover: #1e283d;
    --border-color: #243049;
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.4);
    
    --accent: #ec4899;
    --accent-glow: rgba(236, 72, 153, 0.4);
    
    --success: #10b981;
    --success-glow: rgba(16, 185, 129, 0.2);
    
    --danger: #ef4444;
    --danger-glow: rgba(239, 68, 68, 0.2);
    
    --warning: #f59e0b;

    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 20px;
    --radius-full: 9999px;
    
    --transition-fast: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-normal: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.1);
    --shadow-glow: 0 0 20px 0 var(--primary-glow);
}

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

body {
    background-color: var(--bg-main);
    color: var(--text-primary);
    font-family: var(--font-body);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-heading);
    font-weight: 700;
    color: var(--text-primary);
    line-height: 1.2;
}

a {
    color: inherit;
    text-decoration: none;
    transition: var(--transition-fast);
}

/* Layout Elements */
.app-container {
    max-width: 1200px;
    width: 100%;
    margin: 0 auto;
    padding: 0 24px;
    flex: 1;
}

/* Navigation Bar */
.navbar {
    background-color: rgba(11, 15, 25, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
    padding: 16px 0;
}

.navbar .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-brand {
    font-family: var(--font-heading);
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    display: flex;
    align-items: center;
    gap: 8px;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 24px;
    list-style: none;
}

.nav-link {
    font-weight: 500;
    color: var(--text-secondary);
    font-size: 15px;
    padding: 8px 12px;
    border-radius: var(--radius-sm);
}

.nav-link:hover, .nav-link.active {
    color: var(--text-primary);
    background-color: var(--border-color);
}

.auth-buttons {
    display: flex;
    align-items: center;
    gap: 16px;
}

/* Standard Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    font-family: var(--font-heading);
    font-weight: 600;
    font-size: 15px;
    padding: 10px 20px;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: var(--transition-fast);
    outline: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 0 15px rgba(99, 102, 241, 0.5);
    transform: translateY(-1px);
}

.btn-secondary {
    background-color: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background-color: var(--border-color);
    transform: translateY(-1px);
}

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

.btn-accent:hover {
    opacity: 0.95;
    box-shadow: 0 0 15px rgba(236, 72, 153, 0.4);
    transform: translateY(-1px);
}

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

.btn-danger:hover {
    background-color: #dc2626;
    box-shadow: 0 0 15px rgba(239, 68, 68, 0.4);
    transform: translateY(-1px);
}

.btn-sm {
    padding: 6px 12px;
    font-size: 13px;
    border-radius: var(--radius-sm);
}

.btn-block {
    width: 100%;
}

/* Card Component */
.card {
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

.card-hover:hover {
    transform: translateY(-4px);
    border-color: rgba(99, 102, 241, 0.5);
    background-color: var(--bg-card-hover);
    box-shadow: var(--shadow-lg), 0 10px 30px -10px rgba(99, 102, 241, 0.15);
}

/* Form Styling */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 14px;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-secondary);
}

.form-control {
    width: 100%;
    background-color: rgba(11, 15, 25, 0.5);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px 16px;
    color: var(--text-primary);
    font-family: inherit;
    font-size: 15px;
    transition: var(--transition-fast);
}

.form-control:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
    outline: none;
}

/* Dashboard & Layouts */
.page-header {
    margin: 40px 0 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.page-header h1 {
    font-size: 32px;
}

.page-header p {
    color: var(--text-secondary);
    margin-top: 4px;
}

.grid {
    display: grid;
    gap: 24px;
}

.grid-3 {
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
}

.grid-2 {
    grid-template-columns: repeat(auto-fill, minmax(450px, 1fr));
}

/* Footer */
footer {
    background-color: var(--bg-main);
    border-top: 1px solid var(--border-color);
    padding: 24px 0;
    text-align: center;
    color: var(--text-muted);
    font-size: 14px;
    margin-top: 60px;
}

/* Auth Cards */
.auth-wrapper {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 70vh;
}

.auth-card {
    max-width: 450px;
    width: 100%;
}

.auth-title {
    text-align: center;
    font-size: 28px;
    margin-bottom: 8px;
}

.auth-subtitle {
    text-align: center;
    color: var(--text-secondary);
    font-size: 14px;
    margin-bottom: 24px;
}

.auth-footer-text {
    text-align: center;
    margin-top: 20px;
    font-size: 14px;
    color: var(--text-secondary);
}

.auth-footer-text a {
    color: var(--primary);
    font-weight: 600;
}

.auth-footer-text a:hover {
    text-decoration: underline;
}

.error-message {
    background-color: var(--danger-glow);
    border: 1px solid var(--danger);
    color: var(--text-primary);
    padding: 12px;
    border-radius: var(--radius-md);
    font-size: 14px;
    margin-bottom: 20px;
}

/* Quiz List Component */
.quiz-card {
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    height: 100%;
}

.quiz-card-header {
    margin-bottom: 16px;
}

.quiz-card-title {
    font-size: 20px;
    margin-bottom: 8px;
}

.quiz-card-desc {
    color: var(--text-secondary);
    font-size: 14px;
    display: -webkit-box;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

.quiz-meta {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    font-size: 13px;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    padding-top: 16px;
    margin-top: 16px;
}

.quiz-meta-item {
    display: flex;
    align-items: center;
    gap: 6px;
}

/* Quiz Detail Screen */
.detail-container {
    max-width: 800px;
    margin: 40px auto;
}

.detail-header {
    margin-bottom: 24px;
}

.detail-title {
    font-size: 36px;
    margin-bottom: 12px;
}

.detail-meta {
    display: flex;
    gap: 24px;
    color: var(--text-secondary);
    font-size: 15px;
    margin-bottom: 24px;
}

.detail-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: 32px;
    line-height: 1.7;
}

/* Quiz Playing Screen */
.play-wrapper {
    max-width: 700px;
    margin: 40px auto;
}

.progress-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 12px;
    font-weight: 600;
    color: var(--text-secondary);
}

.progress-container {
    background-color: var(--border-color);
    height: 8px;
    border-radius: var(--radius-full);
    margin-bottom: 24px;
    overflow: hidden;
}

.progress-bar {
    background: linear-gradient(90deg, var(--primary), var(--accent));
    height: 100%;
    width: 0;
    transition: width 0.3s ease;
}

.timer-container {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 16px;
    font-weight: 700;
    color: var(--warning);
    margin-bottom: 24px;
}

.timer-bar-bg {
    background-color: var(--border-color);
    height: 4px;
    width: 100%;
    border-radius: var(--radius-full);
    overflow: hidden;
}

.timer-bar {
    background-color: var(--warning);
    height: 100%;
    width: 100%;
    transition: width 1s linear;
}

.question-card {
    animation: slideIn 0.3s ease;
}

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

.question-text {
    font-size: 22px;
    margin-bottom: 24px;
    line-height: 1.4;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-bottom: 24px;
}

.option-item {
    background-color: rgba(11, 15, 25, 0.4);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 20px;
    cursor: pointer;
    transition: var(--transition-fast);
    display: flex;
    align-items: center;
    gap: 16px;
    position: relative;
    user-select: none;
}

.option-item:hover {
    border-color: rgba(99, 102, 241, 0.4);
    background-color: rgba(99, 102, 241, 0.05);
}

.option-item.selected {
    border-color: var(--primary);
    background-color: rgba(99, 102, 241, 0.1);
}

.option-checkbox {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    border: 2px solid var(--text-muted);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition-fast);
}

.option-item.selected .option-checkbox {
    border-color: var(--primary);
    background-color: var(--primary);
}

.option-checkbox::after {
    content: '✓';
    color: white;
    font-size: 12px;
    font-weight: bold;
    display: none;
}

.option-item.selected .option-checkbox::after {
    display: block;
}

.feedback-section {
    margin-top: 24px;
    padding: 20px;
    border-radius: var(--radius-md);
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.feedback-correct {
    background-color: rgba(16, 185, 129, 0.1);
    border: 1px solid var(--success);
}

.feedback-incorrect {
    background-color: rgba(239, 68, 68, 0.1);
    border: 1px solid var(--danger);
}

.feedback-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 8px;
    display: flex;
    align-items: center;
    gap: 8px;
}

.feedback-correct .feedback-title {
    color: var(--success);
}

.feedback-incorrect .feedback-title {
    color: var(--danger);
}

.feedback-explanation {
    color: var(--text-secondary);
    font-size: 15px;
}

/* Quiz Results Screen */
.result-header-card {
    text-align: center;
    padding: 40px;
    margin-bottom: 40px;
    background: radial-gradient(circle at top, rgba(99, 102, 241, 0.15), transparent);
}

.score-badge {
    display: inline-flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    width: 150px;
    height: 150px;
    border-radius: var(--radius-full);
    border: 4px solid var(--primary);
    margin: 24px 0;
    box-shadow: 0 0 30px rgba(99, 102, 241, 0.3);
}

.score-num {
    font-size: 48px;
    font-family: var(--font-heading);
    font-weight: 800;
    color: var(--text-primary);
}

.score-total {
    font-size: 16px;
    color: var(--text-secondary);
}

.result-list {
    display: flex;
    flex-direction: column;
    gap: 24px;
}

.result-item-card {
    border-left: 4px solid var(--border-color);
}

.result-item-card.correct {
    border-left-color: var(--success);
}

.result-item-card.incorrect {
    border-left-color: var(--danger);
}

.result-item-title {
    font-size: 18px;
    margin-bottom: 16px;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.result-status-badge {
    font-size: 12px;
    font-weight: 700;
    padding: 4px 8px;
    border-radius: var(--radius-sm);
    text-transform: uppercase;
}

.correct .result-status-badge {
    background-color: var(--success-glow);
    color: #34d399;
}

.incorrect .result-status-badge {
    background-color: var(--danger-glow);
    color: #f87171;
}

.result-options-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
    margin-bottom: 16px;
}

.result-option-item {
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.result-option-item.correct-answer {
    border-color: var(--success);
    background-color: rgba(16, 185, 129, 0.05);
}

.result-option-item.user-selected {
    border-color: var(--primary);
}

.result-option-item.user-selected.correct-answer {
    border-color: var(--success);
    background-color: rgba(16, 185, 129, 0.1);
}

.result-option-item.user-selected.wrong-answer {
    border-color: var(--danger);
    background-color: rgba(239, 68, 68, 0.1);
}

.option-badge {
    font-size: 11px;
    font-weight: 700;
    padding: 2px 6px;
    border-radius: 4px;
}

.option-badge.correct {
    background-color: var(--success);
    color: white;
}

.option-badge.selected {
    background-color: var(--primary);
    color: white;
}

.option-badge.wrong {
    background-color: var(--danger);
    color: white;
}

/* Quiz Builder Screen */
.builder-question {
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    margin-bottom: 24px;
    background-color: rgba(21, 28, 44, 0.5);
    position: relative;
}

.builder-question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}

.remove-question-btn {
    color: var(--danger);
    font-size: 14px;
    cursor: pointer;
    background: none;
    border: none;
}

.builder-options-container {
    margin-top: 16px;
}

.builder-option-row {
    display: flex;
    align-items: center;
    gap: 12px;
    margin-bottom: 8px;
}

.builder-checkbox-input {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.json-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-lg);
    padding: 40px;
    text-align: center;
    cursor: pointer;
    background-color: rgba(21, 28, 44, 0.3);
    transition: var(--transition-fast);
    margin-bottom: 24px;
}

.json-upload-area:hover, .json-upload-area.dragover {
    border-color: var(--primary);
    background-color: rgba(99, 102, 241, 0.05);
}

.json-upload-icon {
    font-size: 40px;
    color: var(--text-secondary);
    margin-bottom: 12px;
}

/* MyPage History Stats */
.stats-container {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
    margin-bottom: 32px;
}

.stats-card {
    text-align: center;
    padding: 24px;
}

.stats-val {
    font-size: 36px;
    font-weight: 800;
    color: var(--primary);
}

.stats-lbl {
    font-size: 14px;
    color: var(--text-secondary);
}

/* History table */
.history-list {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.history-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.history-info {
    display: flex;
    flex-direction: column;
    gap: 4px;
}

.history-date {
    font-size: 12px;
    color: var(--text-muted);
}