/* Kwizzen - Mobile-First Styles */

:root {
    --primary: #7c3aed;
    --primary-dark: #6d28d9;
    --primary-light: #a78bfa;
    --secondary: #64748b;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;

    --bg-primary: #f8fafc;
    --bg-card: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;

    --radius: 0.75rem;
    --radius-sm: 0.5rem;
    --shadow: 0 1px 3px rgba(0, 0, 0, 0.1), 0 1px 2px rgba(0, 0, 0, 0.06);
    --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, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);

    --gradient: linear-gradient(135deg, #7c3aed 0%, #a855f7 50%, #ec4899 100%);
}

/* Reset */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

a { color: var(--primary); text-decoration: none; }
a:hover { color: var(--primary-dark); }

/* Container */
.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Navbar */
.navbar {
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    padding: 0.75rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

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

.nav-brand {
    font-size: 1.5rem;
    font-weight: 800;
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-link {
    color: var(--text-secondary);
    padding: 0.4rem 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    transition: all 0.2s;
}

.nav-link:hover, .nav-link.active {
    color: var(--primary);
    background: rgba(124, 58, 237, 0.08);
}

.nav-user {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    margin-left: 0.5rem;
    padding-left: 0.75rem;
    border-left: 1px solid var(--border-color);
}

.nav-username {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    border: none;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    text-decoration: none;
}

.btn-sm { padding: 0.375rem 0.875rem; font-size: 0.8rem; }
.btn-lg { padding: 0.875rem 2rem; font-size: 1.1rem; }
.btn-block { width: 100%; }

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

.btn-secondary {
    background: var(--secondary);
    color: white;
}
.btn-secondary:hover { background: #475569; color: white; }

.btn-success { background: var(--success); color: white; }
.btn-success:hover { background: #059669; color: white; }

.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #dc2626; color: white; }

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

.btn-ghost {
    background: transparent;
    color: var(--text-secondary);
}
.btn-ghost:hover { background: rgba(0,0,0,0.05); color: var(--text-primary); }

/* Forms */
.form-group { margin-bottom: 1.25rem; }

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.375rem;
}

.form-input, .form-select, .form-textarea {
    width: 100%;
    padding: 0.625rem 0.875rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 1rem;
    color: var(--text-primary);
    background: var(--bg-card);
    transition: border-color 0.2s;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}

.form-input.error { border-color: var(--danger); }
.form-hint { font-size: 0.8rem; color: var(--text-muted); margin-top: 0.25rem; }
.form-error { font-size: 0.8rem; color: var(--danger); margin-top: 0.25rem; }

.form-textarea { resize: vertical; min-height: 100px; }

.form-check {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.form-check input[type="checkbox"] {
    width: 1.125rem;
    height: 1.125rem;
    accent-color: var(--primary);
}

/* Cards */
.card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.5rem;
    box-shadow: var(--shadow);
}

.card-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.card-title {
    font-size: 1.125rem;
    font-weight: 700;
}

/* Alerts */
.alert {
    padding: 0.875rem 1rem;
    border-radius: var(--radius-sm);
    margin: 1rem 0;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.3s;
}

.alert-success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-danger { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
.alert-warning { background: #fffbeb; color: #92400e; border: 1px solid #fde68a; }
.alert-info { background: #eff6ff; color: #1e40af; border: 1px solid #bfdbfe; }

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: 0.2rem 0.6rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 600;
}

.badge-success { background: #ecfdf5; color: #065f46; }
.badge-warning { background: #fffbeb; color: #92400e; }
.badge-danger { background: #fef2f2; color: #991b1b; }
.badge-info { background: #eff6ff; color: #1e40af; }
.badge-secondary { background: #f1f5f9; color: #475569; }
.badge-primary { background: rgba(124, 58, 237, 0.1); color: var(--primary); }

/* Auth Pages */
.auth-container {
    max-width: 420px;
    margin: 2rem auto;
    padding: 0 1rem;
}

.auth-card {
    background: var(--bg-card);
    border-radius: var(--radius);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

.auth-title {
    font-size: 1.5rem;
    font-weight: 800;
    text-align: center;
    margin-bottom: 0.5rem;
}

.auth-subtitle {
    text-align: center;
    color: var(--text-muted);
    margin-bottom: 1.5rem;
    font-size: 0.9rem;
}

.auth-footer {
    text-align: center;
    margin-top: 1.25rem;
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* Landing / Hero */
.hero {
    text-align: center;
    padding: 3rem 1rem;
}

.hero-title {
    font-size: 2.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1rem;
}

.hero-title span {
    background: var(--gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: 2rem;
    max-width: 500px;
    margin-left: auto;
    margin-right: auto;
}

/* Join Code Input */
.join-box {
    max-width: 400px;
    margin: 0 auto;
}

.join-input-group {
    display: flex;
    gap: 0.5rem;
}

.join-input {
    flex: 1;
    padding: 0.875rem 1rem;
    font-size: 1.25rem;
    text-align: center;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-weight: 700;
}

.join-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.15);
}

.join-input::placeholder {
    text-transform: none;
    letter-spacing: normal;
    font-weight: 400;
    color: var(--text-muted);
}

/* Quiz Cards Grid */
.quiz-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1rem;
    margin: 1.5rem 0;
}

.quiz-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius);
    padding: 1.25rem;
    box-shadow: var(--shadow);
    transition: all 0.2s;
}

.quiz-card:hover {
    box-shadow: var(--shadow-md);
    transform: translateY(-2px);
}

.quiz-card-title {
    font-size: 1.1rem;
    font-weight: 700;
    margin-bottom: 0.375rem;
}

.quiz-card-meta {
    font-size: 0.8rem;
    color: var(--text-muted);
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

.quiz-card-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

/* Page Header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 1.5rem 0;
    flex-wrap: wrap;
    gap: 1rem;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 800;
}

/* Tables */
.table-responsive { overflow-x: auto; }

table {
    width: 100%;
    border-collapse: collapse;
}

th, td {
    padding: 0.75rem;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}

th {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Leaderboard */
.leaderboard {
    list-style: none;
}

.leaderboard-item {
    display: flex;
    align-items: center;
    padding: 0.875rem 1rem;
    border-bottom: 1px solid var(--border-color);
    gap: 1rem;
}

.leaderboard-rank {
    font-size: 1.25rem;
    font-weight: 800;
    width: 2.5rem;
    text-align: center;
    color: var(--text-muted);
}

.leaderboard-item:nth-child(1) .leaderboard-rank { color: #fbbf24; }
.leaderboard-item:nth-child(2) .leaderboard-rank { color: #94a3b8; }
.leaderboard-item:nth-child(3) .leaderboard-rank { color: #cd7f32; }

.leaderboard-name {
    flex: 1;
    font-weight: 600;
}

.leaderboard-score {
    font-weight: 800;
    font-size: 1.1rem;
    color: var(--primary);
}

/* Player Game View */
.game-container {
    max-width: 500px;
    margin: 0 auto;
    padding: 1rem;
    min-height: calc(100vh - 80px);
    display: flex;
    flex-direction: column;
}

.question-header {
    text-align: center;
    margin-bottom: 1.5rem;
}

.question-number {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.question-points {
    font-size: 0.875rem;
    font-weight: 700;
    color: var(--primary);
}

.question-text {
    font-size: 1.25rem;
    font-weight: 700;
    line-height: 1.4;
    margin-bottom: 1.5rem;
    text-align: center;
}

/* Answer Options */
.answer-options { display: flex; flex-direction: column; gap: 0.75rem; }

.answer-option {
    display: flex;
    align-items: center;
    gap: 0.875rem;
    padding: 1rem 1.25rem;
    border: 2px solid var(--border-color);
    border-radius: var(--radius);
    cursor: pointer;
    font-size: 1rem;
    font-weight: 500;
    transition: all 0.2s;
    background: var(--bg-card);
}

.answer-option:hover { border-color: var(--primary-light); }
.answer-option.selected { border-color: var(--primary); background: rgba(124, 58, 237, 0.05); }
.answer-option.correct { border-color: var(--success); background: #ecfdf5; }
.answer-option.incorrect { border-color: var(--danger); background: #fef2f2; }

.answer-letter {
    width: 2rem;
    height: 2rem;
    border-radius: 50%;
    background: var(--bg-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: 0.875rem;
    flex-shrink: 0;
}

.answer-option.selected .answer-letter { background: var(--primary); color: white; }
.answer-option.correct .answer-letter { background: var(--success); color: white; }
.answer-option.incorrect .answer-letter { background: var(--danger); color: white; }

/* Timer Bar */
.timer-bar {
    height: 6px;
    background: var(--border-color);
    border-radius: 3px;
    margin-bottom: 1.5rem;
    overflow: hidden;
}

.timer-bar-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 3px;
    transition: width 1s linear;
}

.timer-bar-fill.warning { background: var(--warning); }
.timer-bar-fill.danger { background: var(--danger); }

.timer-text {
    text-align: center;
    font-size: 2rem;
    font-weight: 800;
    font-variant-numeric: tabular-nums;
}

/* Waiting / Status Screens */
.status-screen {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 60vh;
    text-align: center;
    gap: 1rem;
}

.status-icon {
    font-size: 3rem;
    color: var(--primary);
}

.status-title {
    font-size: 1.5rem;
    font-weight: 800;
}

.status-subtitle {
    color: var(--text-muted);
    font-size: 1rem;
}

/* Pulse animation for waiting states */
.pulse {
    animation: pulse 2s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Spinner */
.spinner {
    width: 2rem;
    height: 2rem;
    border: 3px solid var(--border-color);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* QM Console Overrides */
.console-layout {
    display: grid;
    grid-template-columns: 1fr;
    gap: 1.5rem;
    margin: 1.5rem 0;
}

/* Footer */
.footer {
    text-align: center;
    padding: 1.5rem;
    font-size: 0.8rem;
    color: var(--text-muted);
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.mt-1 { margin-top: 0.5rem; }
.mt-2 { margin-top: 1rem; }
.mt-3 { margin-top: 1.5rem; }
.mb-1 { margin-bottom: 0.5rem; }
.mb-2 { margin-bottom: 1rem; }
.mb-3 { margin-bottom: 1.5rem; }
.hidden { display: none !important; }
.flex { display: flex; }
.flex-between { display: flex; justify-content: space-between; align-items: center; }
.gap-1 { gap: 0.5rem; }
.gap-2 { gap: 1rem; }

/* Empty state */
.empty-state {
    text-align: center;
    padding: 3rem 1rem;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
    opacity: 0.5;
}

.empty-state p {
    font-size: 1rem;
    margin-bottom: 1.5rem;
}

/* ============================
   TABLET+ (768px)
   ============================ */
@media (min-width: 768px) {
    .quiz-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .hero-title {
        font-size: 3.5rem;
    }

    .console-layout {
        grid-template-columns: 2fr 1fr;
    }
}

/* ============================
   DESKTOP (1024px)
   ============================ */
@media (min-width: 1024px) {
    .quiz-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}