/* ExamDesk - Main Stylesheet */
:root {
    --primary: #4f46e5;
    --primary-gradient: linear-gradient(135deg, #4f46e5, #7c3aed);
    --primary-light: #eef2ff;
    --text-primary: #1a1a2e;
    --text-secondary: #6b7280;
    --text-muted: #6b7280;
    --border: #a4a6a9;
    --bg-white: #fff;
    --bg-light: #f8fafc;
    --bg-gradient: linear-gradient(135deg, #f8fafc, #eef2ff);
    --success: #10b981;
    --error: #ef4444;
    --warning: #f59e0b;
    --shadow: 0 20px 40px rgba(0,0,0,0.1);
    --shadow-sm: 0 4px 6px rgba(0,0,0,0.05);
    --radius: 8px;
    --radius-lg: 16px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-gradient);
    min-height: 100vh;
}

/* Logo */
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 700;
    font-size: 24px;
    color: var(--text-primary);
    text-decoration: none;
}
.logo-icon {
    width: 40px;
    height: 40px;
    background: var(--primary-gradient);
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: #fff;
    font-size: 18px;
}

/* Forms */
.form-container {
    max-width: 480px;
    margin: 40px auto;
    padding: 40px;
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow);
}
.form-header {
    text-align: center;
    margin-bottom: 32px;
}
.form-header h1 {
    font-size: 28px;
    margin-bottom: 8px;
}
.form-header p {
    color: var(--text-secondary);
}
.form-group {
    margin-bottom: 20px;
}
.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}
.form-label {
    display: block;
    font-weight: 500;
    margin-bottom: 6px;
    color: var(--text-primary);
    font-size: 14px;
}
.form-input, .form-select {
    width: 100%;
    padding: 12px 16px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    font-size: 15px;
    transition: all 0.2s;
    background: var(--bg-white);
}
.form-input:focus, .form-select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}
.form-input.error { border-color: var(--error); }
.form-error {
    color: var(--error);
    font-size: 13px;
    margin-top: 4px;
}
.form-hint {
    color: var(--text-muted);
    font-size: 12px;
    margin-top: 4px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-size: 15px;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    border: none;
    text-decoration: none;
}
.btn-primary {
    background: var(--primary-gradient);
    color: #fff;
    width: 100%;
}
.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(79, 70, 229, 0.4);
}
.btn-secondary {
    background: var(--bg-white);
    color: var(--text-secondary);
    border: 1px solid var(--border);
}
.btn-secondary:hover {
    background: var(--bg-light);
}
.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none !important;
}

/* Cards */
.card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border);
}
.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 16px;
}
.card-title {
    font-size: 18px;
    font-weight: 600;
}

/* Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin-bottom: 24px;
}
.stat-card {
    background: var(--bg-white);
    border-radius: var(--radius-lg);
    padding: 24px;
    border: 1px solid var(--border);
}
.stat-value {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary);
}
.stat-label {
    color: var(--text-secondary);
    font-size: 14px;
}

/* Tables */
.table-container {
    overflow-x: auto;
}
table {
    width: 100%;
    border-collapse: collapse;
}
th, td {
    padding: 12px 16px;
    text-align: left;
    border-bottom: 1px solid var(--border);
}
th {
    background: var(--bg-light);
    font-weight: 600;
    font-size: 14px;
    color: var(--text-secondary);
}
tr:hover { background: var(--bg-light); }

/* Badges */
.badge {
    display: inline-flex;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 500;
}
.badge-success { background: #ecfdf5; color: var(--success); }
.badge-warning { background: #fffbeb; color: var(--warning); }
.badge-error { background: #fef2f2; color: var(--error); }
.badge-info { background: var(--primary-light); color: var(--primary); }

/* Tabs */
.tabs {
    display: flex;
    gap: 8px;
    border-bottom: 1px solid var(--border);
    margin-bottom: 24px;
    overflow-x: auto;
}
.tab {
    padding: 12px 20px;
    background: none;
    border: none;
    font-size: 14px;
    font-weight: 500;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    transition: all 0.2s;
}
.tab:hover { color: var(--primary); }
.tab.active {
    color: var(--primary);
    border-bottom-color: var(--primary);
}
.tab-content { display: none; }
.tab-content.active { display: block; }

/* Navbar */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 40px;
    background: var(--bg-white);
    border-bottom: 1px solid var(--border);
}
.nav-links {
    display: flex;
    gap: 32px;
}
.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    transition: color 0.2s;
}
.nav-links a:hover { color: var(--primary); }
.avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--primary-gradient);
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    cursor: pointer;
}

/* Flash Messages */
.flash {
    padding: 16px 20px;
    border-radius: var(--radius);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 12px;
}
.flash-success { background: #ecfdf5; color: var(--success); }
.flash-error { background: #fef2f2; color: var(--error); }

/* Utilities */
.text-center { text-align: center; }
.text-muted { color: var(--text-muted); }
.mt-20 { margin-top: 20px; }
.mb-20 { margin-bottom: 20px; }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}
.fade-in { animation: fadeIn 0.3s ease; }

/* Responsive */
@media (max-width: 768px) {
    .form-container { margin: 15px; padding: 24px; }
    .form-row { grid-template-columns: 1fr; }
    .navbar { padding: 16px 20px; }
    .nav-links { display: none; }
}