/**
 * ExamQuiz - Glassmorphism Design System
 * Modern, responsive UI with glass effects
 */

/* ============================================
   CSS VARIABLES
   ============================================ */
:root {
    /* Primary Colors */
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --primary-light: rgba(99, 102, 241, 0.2);

    /* Status Colors */
    --success: #10b981;
    --success-light: rgba(16, 185, 129, 0.2);
    --warning: #f59e0b;
    --warning-light: rgba(245, 158, 11, 0.2);
    --danger: #ef4444;
    --danger-light: rgba(239, 68, 68, 0.2);
    --info: #3b82f6;
    --info-light: rgba(59, 130, 246, 0.2);

    /* Neutral Colors */
    --text-primary: #1f2937;
    --text-secondary: #6b7280;
    --text-muted: #9ca3af;
    --text-white: #ffffff;

    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.25);
    --glass-bg-dark: rgba(255, 255, 255, 0.15);
    --glass-border: rgba(255, 255, 255, 0.3);
    --glass-shadow: 0 8px 32px rgba(31, 38, 135, 0.15);
    --glass-blur: blur(12px);

    /* Background Gradients */
    --bg-gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --bg-gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --bg-gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --bg-gradient-exam: linear-gradient(135deg, #1e3a5f 0%, #0f172a 100%);

    /* Spacing */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;

    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-base: 300ms ease;
    --transition-slow: 500ms ease;
}

/* ============================================
   RESET & BASE
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Gradient Background */
.bg-gradient {
    background: var(--bg-gradient-1);
    min-height: 100vh;
}

.bg-gradient-exam {
    background: var(--bg-gradient-exam);
    min-height: 100vh;
}

/* ============================================
   GLASS COMPONENTS
   ============================================ */
.glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

.glass-dark {
    background: var(--glass-bg-dark);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
}

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    box-shadow: var(--glass-shadow);
    padding: var(--space-lg);
    transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 40px rgba(31, 38, 135, 0.2);
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1,
h2,
h3,
h4,
h5,
h6 {
    font-weight: 600;
    line-height: 1.3;
    margin-bottom: var(--space-md);
}

h1 {
    font-size: var(--font-size-3xl);
}

h2 {
    font-size: var(--font-size-2xl);
}

h3 {
    font-size: var(--font-size-xl);
}

h4 {
    font-size: var(--font-size-lg);
}

.text-white {
    color: var(--text-white);
}

.text-muted {
    color: var(--text-muted);
}

.text-center {
    text-align: center;
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-sm);
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

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

.btn-success:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-1px);
}

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
    transform: translateY(-1px);
}

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

.btn-glass {
    background: var(--glass-bg);
    backdrop-filter: var(--glass-blur);
    border: 1px solid var(--glass-border);
    color: var(--text-white);
}

.btn-glass:hover:not(:disabled) {
    background: rgba(255, 255, 255, 0.35);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--primary);
    color: var(--primary);
}

.btn-outline:hover:not(:disabled) {
    background: var(--primary);
    color: var(--text-white);
}

.btn-lg {
    padding: var(--space-md) var(--space-xl);
    font-size: var(--font-size-base);
}

.btn-sm {
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-xs);
}

.btn-icon {
    width: 40px;
    height: 40px;
    padding: 0;
    border-radius: var(--radius-md);
}

/* ============================================
   FORMS
   ============================================ */
.form-group {
    margin-bottom: var(--space-lg);
}

.form-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 500;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.form-label-white {
    color: var(--text-white);
}

.form-input {
    width: 100%;
    padding: var(--space-md);
    font-size: var(--font-size-base);
    border: 1px solid #e5e7eb;
    border-radius: var(--radius-md);
    background: rgba(255, 255, 255, 0.9);
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-input-glass {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    color: var(--text-white);
}

.form-input-glass::placeholder {
    color: rgba(255, 255, 255, 0.6);
}

.form-input-glass:focus {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.5);
    box-shadow: 0 0 0 3px rgba(255, 255, 255, 0.1);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='m6 8 4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.75rem center;
    background-repeat: no-repeat;
    background-size: 1.25rem;
    padding-right: 2.5rem;
}

.form-checkbox {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
    cursor: pointer;
}

.form-error {
    font-size: var(--font-size-sm);
    color: var(--danger);
    margin-top: var(--space-xs);
}

/* ============================================
   NAVIGATION GRID (Exam)
   ============================================ */
.nav-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(42px, 1fr));
    gap: var(--space-sm);
    padding: var(--space-md);
}

.nav-item {
    width: 42px;
    height: 42px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    border: 2px solid transparent;
}

.nav-item--unanswered {
    background: rgba(255, 255, 255, 0.2);
    color: var(--text-white);
    border-color: rgba(255, 255, 255, 0.3);
}

.nav-item--answered {
    background: var(--success);
    color: var(--text-white);
}

.nav-item--flagged {
    background: var(--warning);
    color: var(--text-primary);
}

.nav-item--current {
    border-color: var(--text-white);
    transform: scale(1.1);
}

.nav-item:hover {
    transform: scale(1.05);
}

/* ============================================
   TIMER
   ============================================ */
.timer {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: rgba(255, 255, 255, 0.15);
    border-radius: var(--radius-full);
    font-weight: 600;
    color: var(--text-white);
}

.timer--warning {
    background: var(--warning);
    color: var(--text-primary);
    animation: pulse 1s infinite;
}

.timer--danger {
    background: var(--danger);
    animation: pulse 0.5s infinite;
}

@keyframes pulse {

    0%,
    100% {
        opacity: 1;
    }

    50% {
        opacity: 0.7;
    }
}

/* ============================================
   ALERTS & BADGES
   ============================================ */
.alert {
    padding: var(--space-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--space-md);
}

.alert-success {
    background: var(--success-light);
    border: 1px solid var(--success);
    color: #065f46;
}

.alert-danger {
    background: var(--danger-light);
    border: 1px solid var(--danger);
    color: #991b1b;
}

.alert-warning {
    background: var(--warning-light);
    border: 1px solid var(--warning);
    color: #92400e;
}

.alert-info {
    background: var(--info-light);
    border: 1px solid var(--info);
    color: #1e40af;
}

.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border-radius: var(--radius-full);
    text-transform: uppercase;
}

.badge-success {
    background: var(--success-light);
    color: var(--success);
}

.badge-danger {
    background: var(--danger-light);
    color: var(--danger);
}

.badge-warning {
    background: var(--warning-light);
    color: var(--warning);
}

.badge-info {
    background: var(--info-light);
    color: var(--info);
}

.badge-primary {
    background: var(--primary-light);
    color: var(--primary);
}

/* ============================================
   TABLE
   ============================================ */
.table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-md);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: rgba(255, 255, 255, 0.9);
}

.table th,
.table td {
    padding: var(--space-md);
    text-align: left;
    border-bottom: 1px solid #e5e7eb;
}

.table th {
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    background: #f9fafb;
}

.table tbody tr:hover {
    background: #f3f4f6;
}

/* ============================================
   MODAL
   ============================================ */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-md);
    z-index: 1000;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
}

.modal-overlay.active {
    opacity: 1;
    visibility: visible;
}

.modal {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    transform: scale(0.9);
    transition: transform var(--transition-base);
}

.modal-overlay.active .modal {
    transform: scale(1);
}

.modal-header {
    padding: var(--space-lg);
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.modal-body {
    padding: var(--space-lg);
}

/* Answer Review List */
.answers-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    max-height: 400px;
    overflow-y: auto;
}

.answer-item {
    display: flex;
    align-items: flex-start;
    gap: var(--space-md);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    border: 1px solid #e5e7eb;
}

.answer-item.correct {
    background: var(--success-light);
    border-color: var(--success);
}

.answer-item.wrong {
    background: var(--danger-light);
    border-color: var(--danger);
}

.answer-num {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: #f3f4f6;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: var(--font-size-sm);
    flex-shrink: 0;
}

.answer-item.correct .answer-num {
    background: var(--success);
    color: white;
}

.answer-item.wrong .answer-num {
    background: var(--danger);
    color: white;
}

.answer-content {
    flex: 1;
    min-width: 0;
}

.answer-question {
    font-weight: 500;
    margin-bottom: var(--space-xs);
    word-break: break-word;
}

.answer-detail {
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.answer-status {
    flex-shrink: 0;
}

.text-success {
    color: var(--success);
}

.modal-footer {
    padding: var(--space-lg);
    border-top: 1px solid #e5e7eb;
    display: flex;
    justify-content: flex-end;
    gap: var(--space-sm);
}

/* ============================================
   LAYOUT
   ============================================ */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

.container-sm {
    max-width: 640px;
}

.container-md {
    max-width: 768px;
}

.container-lg {
    max-width: 1024px;
}

.flex {
    display: flex;
}

.flex-col {
    flex-direction: column;
}

.items-center {
    align-items: center;
}

.justify-center {
    justify-content: center;
}

.justify-between {
    justify-content: space-between;
}

.gap-sm {
    gap: var(--space-sm);
}

.gap-md {
    gap: var(--space-md);
}

.gap-lg {
    gap: var(--space-lg);
}

.grid {
    display: grid;
}

.grid-cols-2 {
    grid-template-columns: repeat(2, 1fr);
}

.grid-cols-3 {
    grid-template-columns: repeat(3, 1fr);
}

.grid-cols-4 {
    grid-template-columns: repeat(4, 1fr);
}

/* Spacing utilities */
.p-md {
    padding: var(--space-md);
}

.p-lg {
    padding: var(--space-lg);
}

.p-xl {
    padding: var(--space-xl);
}

.py-xl {
    padding-top: var(--space-xl);
    padding-bottom: var(--space-xl);
}

.mt-md {
    margin-top: var(--space-md);
}

.mt-lg {
    margin-top: var(--space-lg);
}

.mb-md {
    margin-bottom: var(--space-md);
}

.mb-lg {
    margin-bottom: var(--space-lg);
}

.w-full {
    width: 100%;
}

.h-screen {
    min-height: 100vh;
}

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    :root {
        --font-size-3xl: 1.75rem;
        --font-size-2xl: 1.25rem;
    }

    .container {
        padding: 0 var(--space-sm);
    }

    .glass-card {
        padding: var(--space-md);
    }

    .grid-cols-2,
    .grid-cols-3,
    .grid-cols-4 {
        grid-template-columns: 1fr;
    }

    .nav-grid {
        grid-template-columns: repeat(5, 1fr);
    }

    .btn {
        width: 100%;
    }

    .modal {
        margin: var(--space-sm);
        max-height: calc(100vh - 2rem);
    }
}

@media (max-width: 480px) {
    .nav-grid {
        grid-template-columns: repeat(5, 1fr);
        gap: var(--space-xs);
    }

    .nav-item {
        width: 38px;
        height: 38px;
        font-size: var(--font-size-xs);
    }
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
    from {
        opacity: 0;
    }

    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fade-in {
    animation: fadeIn var(--transition-base);
}

.animate-slide-up {
    animation: slideUp var(--transition-base);
}

/* ============================================
   LOADING
   ============================================ */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

/* ============================================
   RADIO OPTIONS (Exam)
   ============================================ */
.option-group {
    display: flex;
    flex-direction: column;
    gap: var(--space-md);
}

.option-item {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    padding: var(--space-md);
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-white);
}

.option-item:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: rgba(255, 255, 255, 0.4);
}

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

.option-radio {
    width: 22px;
    height: 22px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.option-item.selected .option-radio {
    border-color: white;
}

.option-item.selected .option-radio::after {
    content: '';
    width: 10px;
    height: 10px;
    background: white;
    border-radius: 50%;
}

.option-text {
    flex: 1;
    font-size: var(--font-size-base);
}

.option-label {
    width: 28px;
    height: 28px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.2);
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: var(--font-size-sm);
}