/* shadcn-inspired styles using CSS variables */
:root {
    --background: 0 0% 100%;
    --foreground: 222.2 84% 4.9%;
    --card: 0 0% 100%;
    --card-foreground: 222.2 84% 4.9%;
    --popover: 0 0% 100%;
    --popover-foreground: 222.2 84% 4.9%;
    --primary: 222.2 47.4% 11.2%;
    --primary-foreground: 210 40% 98%;
    --secondary: 210 40% 96.1%;
    --secondary-foreground: 222.2 47.4% 11.2%;
    --muted: 210 40% 96.1%;
    --muted-foreground: 215.4 16.3% 46.9%;
    --accent: 210 40% 96.1%;
    --accent-foreground: 222.2 47.4% 11.2%;
    --destructive: 0 84.2% 60.2%;
    --destructive-foreground: 210 40% 98%;
    --border: 214.3 31.8% 91.4%;
    --input: 214.3 31.8% 91.4%;
    --ring: 222.2 84% 4.9%;
    --radius: 0.5rem;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: hsl(var(--background));
    color: hsl(var(--foreground));
    line-height: 1.5;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Card component */
.card {
    background-color: hsl(var(--card));
    border: 1px solid hsl(var(--border));
    border-radius: var(--radius);
    box-shadow: 0 1px 3px 0 rgb(0 0 0 / 0.1);
}

.card-header {
    padding: 1.5rem 1.5rem 0;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 600;
    line-height: 1;
    letter-spacing: -0.025em;
}

.card-description {
    color: hsl(var(--muted-foreground));
    font-size: 0.875rem;
    margin-top: 0.375rem;
}

.card-content {
    padding: 1.5rem;
}

.card-footer {
    padding: 0 1.5rem 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

/* Button component */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    white-space: nowrap;
    border-radius: var(--radius);
    font-size: 0.875rem;
    font-weight: 500;
    height: 2.5rem;
    padding: 0 1rem;
    cursor: pointer;
    transition: all 0.15s ease;
    border: none;
    text-decoration: none;
}

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

.btn-primary:hover {
    background-color: hsl(var(--primary) / 0.9);
}

.btn-secondary {
    background-color: hsl(var(--secondary));
    color: hsl(var(--secondary-foreground));
}

.btn-secondary:hover {
    background-color: hsl(var(--secondary) / 0.8);
}

.btn-destructive {
    background-color: hsl(var(--destructive));
    color: hsl(var(--destructive-foreground));
}

.btn-destructive:hover {
    background-color: hsl(var(--destructive) / 0.9);
}

.btn-outline {
    border: 1px solid hsl(var(--input));
    background-color: transparent;
    color: hsl(var(--foreground));
}

.btn-outline:hover {
    background-color: hsl(var(--accent));
}

.btn-ghost {
    background-color: transparent;
    color: hsl(var(--foreground));
}

.btn-ghost:hover {
    background-color: hsl(var(--accent));
}

.btn-lg {
    height: 3rem;
    padding: 0 2rem;
    font-size: 1rem;
}

.btn-sm {
    height: 2rem;
    padding: 0 0.75rem;
    font-size: 0.75rem;
}

/* Input component */
.input {
    display: flex;
    height: 2.5rem;
    width: 100%;
    border-radius: var(--radius);
    border: 1px solid hsl(var(--input));
    background-color: hsl(var(--background));
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    outline: none;
    transition: all 0.15s ease;
}

.input:focus {
    border-color: hsl(var(--ring));
    box-shadow: 0 0 0 2px hsl(var(--ring) / 0.2);
}

.input::placeholder {
    color: hsl(var(--muted-foreground));
}

/* Textarea component */
.textarea {
    display: flex;
    min-height: 5rem;
    width: 100%;
    border-radius: var(--radius);
    border: 1px solid hsl(var(--input));
    background-color: hsl(var(--background));
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
    outline: none;
    transition: all 0.15s ease;
    resize: vertical;
    font-family: inherit;
}

.textarea:focus {
    border-color: hsl(var(--ring));
    box-shadow: 0 0 0 2px hsl(var(--ring) / 0.2);
}

/* Label component */
.label {
    font-size: 0.875rem;
    font-weight: 500;
    line-height: 1;
    display: block;
    margin-bottom: 0.5rem;
}

/* Form group */
.form-group {
    margin-bottom: 1rem;
}

/* Badge component */
.badge {
    display: inline-flex;
    align-items: center;
    border-radius: 9999px;
    padding: 0.125rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    line-height: 1;
}

.badge-default {
    background-color: hsl(var(--primary));
    color: hsl(var(--primary-foreground));
}

.badge-secondary {
    background-color: hsl(var(--secondary));
    color: hsl(var(--secondary-foreground));
}

.badge-success {
    background-color: #22c55e;
    color: white;
}

.badge-destructive {
    background-color: hsl(var(--destructive));
    color: hsl(var(--destructive-foreground));
}

/* Header */
.header {
    border-bottom: 1px solid hsl(var(--border));
    padding: 1rem 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.header-title {
    font-size: 1.25rem;
    font-weight: 600;
}

.header-nav {
    display: flex;
    gap: 0.5rem;
}

/* Grid layout */
.grid {
    display: grid;
    gap: 1.5rem;
}

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

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

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

@media (max-width: 768px) {
    .grid-cols-2,
    .grid-cols-3 {
        grid-template-columns: 1fr;
    }
}

/* Flex utilities */
.flex {
    display: flex;
}

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

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

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

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

.gap-2 {
    gap: 0.5rem;
}

.gap-4 {
    gap: 1rem;
}

/* Spacing utilities */
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; }
.mb-2 { margin-bottom: 0.5rem; }
.mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; }
.p-4 { padding: 1rem; }
.p-6 { padding: 1.5rem; }

/* Text utilities */
.text-center { text-align: center; }
.text-sm { font-size: 0.875rem; }
.text-lg { font-size: 1.125rem; }
.text-xl { font-size: 1.25rem; }
.text-2xl { font-size: 1.5rem; }
.text-muted { color: hsl(var(--muted-foreground)); }
.font-medium { font-weight: 500; }
.font-semibold { font-weight: 600; }
.font-bold { font-weight: 700; }

/* Width utilities */
.w-full { width: 100%; }

/* Question card styling */
.question-card {
    background-color: hsl(var(--card));
    border: 1px solid hsl(var(--border));
    border-radius: var(--radius);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.question-number {
    font-weight: 600;
    color: hsl(var(--muted-foreground));
    margin-bottom: 0.5rem;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 1rem;
}

.remove-question-btn {
    background: none;
    border: none;
    color: hsl(var(--destructive));
    cursor: pointer;
    padding: 0.25rem;
    font-size: 1.25rem;
    line-height: 1;
}

.remove-question-btn:hover {
    color: hsl(var(--destructive) / 0.8);
}

/* Video embed */
.video-container {
    position: relative;
    width: 100%;
    padding-bottom: 56.25%;
    margin: 1rem 0;
    border-radius: var(--radius);
    overflow: hidden;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    border: none;
}

/* Quiz play styles */
.play-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

.question-progress {
    text-align: center;
    margin-bottom: 1rem;
    color: hsl(var(--muted-foreground));
}

.progress-bar {
    width: 100%;
    height: 0.5rem;
    background-color: hsl(var(--secondary));
    border-radius: 9999px;
    overflow: hidden;
    margin-bottom: 2rem;
}

.progress-fill {
    height: 100%;
    background-color: hsl(var(--primary));
    transition: width 0.3s ease;
}

.answer-options {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.answer-option {
    display: block;
    width: 100%;
    text-align: left;
    padding: 1rem 1.25rem;
    background-color: hsl(var(--card));
    border: 2px solid hsl(var(--border));
    border-radius: var(--radius);
    cursor: pointer;
    transition: all 0.15s ease;
    font-size: 1rem;
}

.answer-option:hover {
    border-color: hsl(var(--primary));
    background-color: hsl(var(--accent));
}

.answer-option.correct {
    border-color: #22c55e;
    background-color: #22c55e20;
}

.answer-option.incorrect {
    border-color: hsl(var(--destructive));
    background-color: hsl(var(--destructive) / 0.1);
}

.answer-option.disabled {
    pointer-events: none;
    opacity: 0.6;
}

/* Results styling */
.results-card {
    text-align: center;
    padding: 2rem;
}

.score-display {
    font-size: 4rem;
    font-weight: 700;
    color: hsl(var(--primary));
    margin: 1rem 0;
}

.results-list {
    text-align: left;
    margin-top: 2rem;
}

.result-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem;
    border-bottom: 1px solid hsl(var(--border));
}

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

.result-icon {
    width: 1.5rem;
    height: 1.5rem;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.result-icon.correct {
    background-color: #22c55e;
    color: white;
}

.result-icon.incorrect {
    background-color: hsl(var(--destructive));
    color: white;
}

.result-details {
    flex: 1;
}

.result-answer {
    font-weight: 500;
}

.result-comment {
    font-size: 0.875rem;
    color: hsl(var(--muted-foreground));
    margin-top: 0.25rem;
}

/* Hidden video player */
.hidden-player {
    position: fixed;
    top: -9999px;
    left: -9999px;
    width: 1px;
    height: 1px;
    opacity: 0;
    pointer-events: none;
}

/* Empty state */
.empty-state {
    text-align: center;
    padding: 4rem 2rem;
    color: hsl(var(--muted-foreground));
}

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

/* Alert/notification */
.alert {
    padding: 1rem;
    border-radius: var(--radius);
    margin-bottom: 1rem;
}

.alert-warning {
    background-color: #fef3c7;
    border: 1px solid #f59e0b;
    color: #92400e;
}

.alert-info {
    background-color: #dbeafe;
    border: 1px solid #3b82f6;
    color: #1e40af;
}

/* Separator */
.separator {
    height: 1px;
    background-color: hsl(var(--border));
    margin: 1.5rem 0;
}