/* KlausurenMaster – Mobile-First CSS */

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

:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --bg: #f8fafc;
    --card-bg: #ffffff;
    --text: #1e293b;
    --text-light: #64748b;
    --border: #e2e8f0;
    --success: #16a34a;
    --danger: #dc2626;
    --radius: 12px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: var(--bg);
    color: var(--text);
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 0 16px;
}

/* Header */
header {
    background: var(--primary);
    color: white;
    padding: 12px 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 8px;
}

.logo {
    font-size: 1.3rem;
    font-weight: 700;
}

nav {
    display: flex;
    gap: 12px;
    align-items: center;
    flex-wrap: wrap;
}

nav a {
    color: rgba(255,255,255,0.9);
    text-decoration: none;
    font-size: 0.9rem;
    padding: 4px 8px;
    border-radius: 6px;
    transition: background 0.2s;
}

nav a:hover {
    background: rgba(255,255,255,0.15);
}

/* Pages */
.page {
    display: none;
    padding: 20px 0;
}

.page.active {
    display: block;
}

/* Search */
.search-box {
    display: flex;
    gap: 8px;
    margin-bottom: 24px;
}

.search-box input {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 1rem;
    outline: none;
    transition: border-color 0.2s;
}

.search-box input:focus {
    border-color: var(--primary);
}

.search-box button {
    padding: 12px 20px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    cursor: pointer;
}

.search-box button:hover {
    background: var(--primary-dark);
}

/* Card Grid */
.card-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 12px;
    margin-bottom: 24px;
}

@media (min-width: 500px) {
    .card-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

.card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    cursor: pointer;
    transition: box-shadow 0.2s, transform 0.1s;
}

.card:hover {
    box-shadow: 0 4px 12px rgba(0,0,0,0.08);
    transform: translateY(-1px);
}

.card h3 {
    font-size: 1rem;
    margin-bottom: 4px;
}

.card .meta {
    color: var(--text-light);
    font-size: 0.85rem;
}

.badge {
    display: inline-block;
    padding: 2px 8px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    background: #e0e7ff;
    color: var(--primary);
}

/* Forms */
.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    font-weight: 600;
    font-size: 0.9rem;
    margin-bottom: 4px;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 10px 12px;
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    outline: none;
}

.form-group input:focus,
.form-group select:focus {
    border-color: var(--primary);
}

.form-row {
    display: flex;
    gap: 12px;
    flex-wrap: wrap;
}

.form-row .form-group {
    flex: 1;
    min-width: 120px;
}

.btn-primary {
    padding: 12px 24px;
    background: var(--primary);
    color: white;
    border: none;
    border-radius: var(--radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
}

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

.btn-secondary {
    padding: 8px 16px;
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    border-radius: 8px;
    font-size: 0.9rem;
    cursor: pointer;
}

/* Modal */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 200;
}

.modal-content {
    background: white;
    border-radius: var(--radius);
    padding: 24px;
    width: 90%;
    max-width: 400px;
}

.close {
    float: right;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--text-light);
}

.auth-switch {
    text-align: center;
    margin-top: 16px;
    font-size: 0.9rem;
}

/* Prediction */
.prediction-card {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 16px;
    margin-bottom: 12px;
}

.probability-bar {
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    margin-top: 8px;
    overflow: hidden;
}

.probability-fill {
    height: 100%;
    background: var(--primary);
    border-radius: 4px;
    transition: width 0.5s;
}

.confidence-high { color: var(--success); }
.confidence-medium { color: #ca8a04; }
.confidence-low { color: var(--danger); }

/* Exam Detail */
.exam-header {
    margin-bottom: 20px;
}

.question-item {
    background: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 12px;
    margin-bottom: 8px;
}

.question-item .tags {
    margin-top: 6px;
}

/* Alerts */
.alert {
    padding: 12px 16px;
    border-radius: 8px;
    margin-bottom: 16px;
    font-size: 0.9rem;
}

.alert-success {
    background: #dcfce7;
    color: #166534;
}

.alert-error {
    background: #fee2e2;
    color: #991b1b;
}

.alert-info {
    background: #dbeafe;
    color: #1e40af;
}

/* Credits */
.credits-badge {
    background: rgba(255,255,255,0.2);
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 0.85rem;
    color: white;
}

/* Loading */
.loading {
    text-align: center;
    padding: 40px;
    color: var(--text-light);
}

.spinner {
    display: inline-block;
    width: 30px;
    height: 30px;
    border: 3px solid var(--border);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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