/* ============================================================
   Examination — Premium UI
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

:root {
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #ec4899;
    --accent: #06b6d4;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --dark: #0f172a;
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-500: #64748b;
    --gray-700: #334155;
    --gradient-1: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-2: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-3: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-4: linear-gradient(135deg, #43e97b 0%, #38f9d7 100%);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.12);
    --shadow-xl: 0 24px 48px rgba(0, 0, 0, 0.16);
    --radius: 16px;
    --radius-sm: 10px;
    --radius-lg: 24px;
}

* {
    box-sizing: border-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--gray-50);
    color: var(--dark);
    min-height: 100vh;
    margin: 0;
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

/* ============ Auth Background ============ */
.auth-bg {
    background: var(--gradient-1);
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 24px;
}

.auth-bg::before,
.auth-bg::after {
    content: '';
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
    pointer-events: none;
}

.auth-bg::before {
    width: 400px;
    height: 400px;
    background: #f093fb;
    top: -100px;
    left: -100px;
    animation: float 8s ease-in-out infinite;
}

.auth-bg::after {
    width: 500px;
    height: 500px;
    background: #4facfe;
    bottom: -150px;
    right: -150px;
    animation: float 10s ease-in-out infinite reverse;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0); }
    50% { transform: translate(30px, -30px); }
}

/* ============ Cards ============ */
.glass-card {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: 40px;
    width: 100%;
    max-width: 520px;
    position: relative;
    z-index: 2;
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.card {
    background: #fff;
    border-radius: var(--radius);
    border: none;
    box-shadow: var(--shadow-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

/* ============ Typography ============ */
h1, h2, h3, h4, h5 {
    font-weight: 700;
    color: var(--dark);
    letter-spacing: -0.02em;
}

.brand-title {
    font-size: 2rem;
    font-weight: 800;
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 8px;
    letter-spacing: -0.03em;
}

.subtitle {
    color: var(--gray-500);
    font-size: 1rem;
    margin-bottom: 32px;
}

/* ============ Forms ============ */
.form-label {
    font-weight: 600;
    color: var(--gray-700);
    font-size: 0.875rem;
    margin-bottom: 8px;
    letter-spacing: -0.01em;
}

.form-control,
.form-select {
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    padding: 12px 16px;
    font-size: 0.95rem;
    transition: all 0.2s;
    background: #fff;
    color: var(--dark);
}

.form-control:focus,
.form-select:focus {
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    outline: none;
}

.form-control-lg {
    padding: 14px 18px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
}

.form-control::placeholder {
    color: var(--gray-500);
    opacity: 0.6;
}

/* ============ Buttons ============ */
.btn {
    border-radius: var(--radius-sm);
    font-weight: 600;
    padding: 12px 24px;
    transition: all 0.25s cubic-bezier(0.4, 0, 0.2, 1);
    letter-spacing: -0.01em;
    border: none;
    font-size: 0.95rem;
}

.btn-primary {
    background: var(--gradient-1);
    color: #fff;
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.3);
}

.btn-primary:hover,
.btn-primary:focus {
    background: var(--gradient-1);
    filter: brightness(1.08);
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(99, 102, 241, 0.4);
    color: #fff;
}

.btn-lg {
    padding: 14px 28px;
    font-size: 1rem;
    border-radius: var(--radius-sm);
}

.btn-success {
    background: var(--gradient-4);
    color: #fff;
    box-shadow: 0 4px 12px rgba(16, 185, 129, 0.3);
}

.btn-success:hover {
    filter: brightness(1.08);
    transform: translateY(-1px);
    color: #fff;
}

.btn-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: #fff;
}

.btn-danger:hover {
    filter: brightness(1.08);
    color: #fff;
}

.btn-warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    color: #fff;
}

.btn-info {
    background: linear-gradient(135deg, #06b6d4, #0891b2);
    color: #fff;
}

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

.btn-outline-primary:hover {
    background: var(--primary);
    color: #fff;
}

.btn-sm {
    padding: 6px 14px;
    font-size: 0.8rem;
    border-radius: 8px;
}

/* ============ Badges ============ */
.badge {
    padding: 6px 14px;
    font-weight: 600;
    border-radius: 999px;
    font-size: 0.75rem;
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

.badge.bg-warning { background: linear-gradient(135deg, #fef3c7, #fde68a) !important; color: #92400e !important; }
.badge.bg-success { background: linear-gradient(135deg, #d1fae5, #a7f3d0) !important; color: #065f46 !important; }
.badge.bg-danger  { background: linear-gradient(135deg, #fee2e2, #fecaca) !important; color: #991b1b !important; }
.badge.bg-info    { background: linear-gradient(135deg, #cffafe, #a5f3fc) !important; color: #155e75 !important; }

/* ============ Navbar (Admin) ============ */
.admin-nav {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
    padding: 16px 32px;
    box-shadow: var(--shadow-md);
    position: sticky;
    top: 0;
    z-index: 100;
}

.admin-nav .brand {
    font-size: 1.25rem;
    font-weight: 800;
    color: #fff;
    background: var(--gradient-3);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: -0.02em;
}

.admin-nav .nav-actions {
    display: flex;
    gap: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.admin-nav .nav-actions .btn {
    padding: 8px 16px;
    font-size: 0.85rem;
    background: rgba(255, 255, 255, 0.08);
    color: #fff;
    border: 1px solid rgba(255, 255, 255, 0.15);
}

.admin-nav .nav-actions .btn:hover {
    background: rgba(255, 255, 255, 0.18);
    border-color: rgba(255, 255, 255, 0.3);
    color: #fff;
}

.admin-nav .nav-actions .btn-danger {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    border: none;
}

.admin-nav .nav-actions .btn-danger:hover {
    filter: brightness(1.1);
}

/* ============ Tables ============ */
.admin-table {
    background: #fff;
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow-md);
}

.admin-table table {
    width: 100%;
    border-collapse: separate;
    border-spacing: 0;
    margin: 0;
}

.admin-table thead th {
    background: var(--gray-50);
    padding: 16px 20px;
    font-weight: 700;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray-500);
    border-bottom: 1px solid var(--gray-200);
    text-align: left;
    white-space: nowrap;
}

.admin-table tbody td {
    padding: 16px 20px;
    border-bottom: 1px solid var(--gray-100);
    vertical-align: middle;
    font-size: 0.9rem;
}

.admin-table tbody tr {
    transition: background 0.15s;
}

.admin-table tbody tr:hover {
    background: var(--gray-50);
}

.admin-table tbody tr:last-child td {
    border-bottom: none;
}

/* ============ Dashboard Stats ============ */
.stat-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 24px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s;
    position: relative;
    overflow: hidden;
    height: 100%;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--gradient-1);
}

.stat-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.stat-label {
    font-size: 0.75rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    color: var(--gray-500);
    margin-bottom: 8px;
}

.stat-value {
    font-size: 2rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    color: var(--dark);
    line-height: 1.1;
}

.stat-card.primary::before { background: var(--gradient-1); }
.stat-card.success::before { background: var(--gradient-4); }
.stat-card.warning::before { background: linear-gradient(135deg, #f59e0b, #d97706); }
.stat-card.danger::before  { background: linear-gradient(135deg, #ef4444, #dc2626); }
.stat-card.info::before    { background: var(--gradient-3); }
.stat-card.pink::before    { background: var(--gradient-2); }

/* ============ Alert ============ */
.alert {
    border-radius: var(--radius-sm);
    border: none;
    padding: 14px 18px;
    font-weight: 500;
    font-size: 0.9rem;
}

.alert-success {
    background: linear-gradient(135deg, #d1fae5, #a7f3d0);
    color: #065f46;
}

.alert-danger {
    background: linear-gradient(135deg, #fee2e2, #fecaca);
    color: #991b1b;
}

.alert-warning {
    background: linear-gradient(135deg, #fef3c7, #fde68a);
    color: #92400e;
}

.alert-info {
    background: linear-gradient(135deg, #cffafe, #a5f3fc);
    color: #155e75;
}

/* ============ Exam Page ============ */
.exam-container {
    max-width: 800px;
    margin: 0 auto;
    padding: 32px 16px;
}

.exam-header {
    position: sticky;
    top: 16px;
    z-index: 50;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    border-radius: var(--radius);
    padding: 20px 28px;
    box-shadow: var(--shadow-lg);
    margin-bottom: 24px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.exam-header h4 {
    margin: 0;
    font-size: 1.15rem;
}

.timer-badge {
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: #fff;
    padding: 10px 20px;
    border-radius: 12px;
    font-weight: 700;
    font-size: 1.05rem;
    font-variant-numeric: tabular-nums;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.3);
    letter-spacing: 0.02em;
}

.timer-badge.warning {
    background: linear-gradient(135deg, #f59e0b, #d97706);
    animation: pulse 1s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.question-card {
    background: #fff;
    border-radius: var(--radius);
    padding: 28px;
    margin-bottom: 20px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--gray-100);
    transition: all 0.3s;
}

.question-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--gray-200);
}

.question-number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: 10px;
    background: var(--gradient-1);
    color: #fff;
    font-weight: 700;
    font-size: 0.9rem;
    margin-right: 12px;
}

.question-text {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--dark);
    margin-bottom: 20px;
    line-height: 1.5;
}

.option-item {
    display: flex;
    align-items: center;
    padding: 14px 18px;
    margin-bottom: 10px;
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
    background: #fff;
}

.option-item:hover {
    border-color: var(--primary-light);
    background: #f8f8ff;
}

.option-item input[type="radio"] {
    margin-right: 14px;
    width: 20px;
    height: 20px;
    accent-color: var(--primary);
    cursor: pointer;
}

.option-item input[type="radio"]:checked ~ label {
    color: var(--primary-dark);
    font-weight: 600;
}

.option-item:has(input:checked) {
    border-color: var(--primary);
    background: linear-gradient(135deg, #eef2ff, #e0e7ff);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.15);
}

.option-item label {
    cursor: pointer;
    margin: 0;
    flex: 1;
    font-size: 0.95rem;
    font-weight: 500;
    color: var(--gray-700);
}

.blank-input {
    width: 100%;
    padding: 16px 20px;
    border: 2px dashed var(--gray-200);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    transition: all 0.2s;
}

.blank-input:focus {
    border-color: var(--primary);
    border-style: solid;
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    outline: none;
}

/* ============ Result Page ============ */
.result-card {
    text-align: center;
    padding: 48px 32px;
}

.result-circle {
    width: 200px;
    height: 200px;
    border-radius: 50%;
    margin: 0 auto 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    background: conic-gradient(var(--primary) 0deg, var(--primary) var(--pct-deg, 0deg), var(--gray-200) var(--pct-deg, 0deg));
    animation: rotateIn 0.8s ease-out;
}

.result-circle::before {
    content: '';
    position: absolute;
    inset: 14px;
    border-radius: 50%;
    background: #fff;
}

.result-circle .result-value {
    position: relative;
    z-index: 2;
    font-size: 3rem;
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1;
}

.result-circle.pass .result-value { color: var(--success); }
.result-circle.fail .result-value { color: var(--danger); }
.result-circle.pass { background: conic-gradient(var(--success) 0deg, var(--success) var(--pct-deg), var(--gray-200) var(--pct-deg)); }
.result-circle.fail { background: conic-gradient(var(--danger) 0deg, var(--danger) var(--pct-deg), var(--gray-200) var(--pct-deg)); }

@keyframes rotateIn {
    from { transform: rotate(-180deg) scale(0.5); opacity: 0; }
    to { transform: rotate(0) scale(1); opacity: 1; }
}

/* ============ Misc ============ */
.text-gradient {
    background: var(--gradient-1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.page-title {
    font-size: 1.75rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    margin-bottom: 24px;
}

.divider {
    height: 1px;
    background: var(--gray-200);
    margin: 24px 0;
}

/* Responsive */
@media (max-width: 768px) {
    .glass-card { padding: 28px 20px; border-radius: var(--radius); }
    .brand-title { font-size: 1.6rem; }
    .exam-header { padding: 16px 20px; }
    .question-card { padding: 20px; }
    .admin-nav { padding: 12px 16px; }
    .admin-nav .nav-actions .btn { padding: 6px 12px; font-size: 0.8rem; }
}