/* assets/css/style.css */
:root {
    --primary-color: #4f46e5; /* Indigo 600 */
    --primary-hover: #4338ca; /* Indigo 700 */
    --secondary-color: #10b981; /* Emerald 500 */
    --bg-color: #f3f4f6; /* Gray 100 */
    --card-bg: #ffffff;
    --text-main: #1f2937; /* Gray 800 */
    --text-muted: #6b7280; /* Gray 500 */
    --danger: #ef4444;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    font-family: var(--font-family);
    background-color: var(--bg-color);
    color: var(--text-main);
    line-height: 1.5;
}

a {
    text-decoration: none;
    color: inherit;
}

/* Layout Utilities */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

.flex { display: flex; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.flex-col { flex-direction: column; }
.gap-4 { gap: 1rem; }
.w-full { width: 100%; }
.mt-4 { margin-top: 1rem; }
.mb-4 { margin-bottom: 1rem; }
.p-6 { padding: 1.5rem; }
.text-center { text-align: center; }

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.5rem 1rem;
    border-radius: 0.375rem;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
    border: none;
    font-size: 0.875rem;
}

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

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}
.btn-secondary:hover { opacity: 0.9; }

.btn-danger {
    background-color: var(--danger);
    color: white;
}
.btn-danger:hover { opacity: 0.9; }

/* Forms */
.form-group { margin-bottom: 1rem; }
.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    color: var(--text-main);
}
.form-control {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    box-shadow: var(--shadow-sm);
    font-size: 1rem;
}
.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    ring: 2px solid var(--primary-color);
}

/* Cards */
.card {
    background-color: var(--card-bg);
    border-radius: 0.5rem;
    box-shadow: var(--shadow-md);
    overflow: hidden;
}

/* Tables */
.table-responsive {
    overflow-x: auto;
}
.table {
    width: 100%;
    border-collapse: collapse;
}
.table th, .table td {
    padding: 0.75rem 1rem;
    text-align: left;
    border-bottom: 1px solid #e5e7eb;
}
.table th {
    background-color: #f9fafb;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.75rem;
    letter-spacing: 0.05em;
    color: var(--text-muted);
}
.table tr:last-child td { border-bottom: none; }

/* Header/Nav */
.navbar {
    background-color: white;
    box-shadow: var(--shadow-sm);
    height: 64px;
    display: flex;
    align-items: center;
}
.nav-link {
    color: var(--text-muted);
    font-weight: 500;
    padding: 0.5rem 0.75rem;
    border-radius: 0.375rem;
}
.nav-link:hover, .nav-link.active {
    color: var(--primary-color);
    background-color: #eef2ff;
}

/* Alerts */
.alert {
    padding: 1rem;
    border-radius: 0.375rem;
    margin-bottom: 1rem;
}
.alert-success { background-color: #d1fae5; color: #065f46; }
.alert-danger { background-color: #fee2e2; color: #991b1b; }

/* Login Page Specific */
.login-page {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
}
.login-box {
    width: 100%;
    max-width: 400px;
    padding: 2rem;
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

/* Test Interface */
.question-card {
    margin-bottom: 1.5rem;
}
.question-text {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1rem;
}
.options-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: 0.75rem;
}
.option-label {
    display: flex;
    align-items: center;
    padding: 0.75rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    cursor: pointer;
    transition: all 0.2s;
}
.option-label:hover {
    background-color: #f3f4f6;
}
.option-input:checked + .option-content {
    color: var(--primary-color);
    font-weight: 600;
}
.timer-sticky {
    position: sticky;
    top: 1rem;
    z-index: 10;
    background: white;
    padding: 0.5rem 1rem;
    border-radius: 9999px;
    box-shadow: var(--shadow-md);
    display: inline-block;
    color: var(--primary-color);
    font-weight: 700;
}