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

:root {
    --bg-base: #f1f5f9;
    --bg-surface: rgba(255, 255, 255, 0.85);
    --bg-surface-hover: rgba(255, 255, 255, 0.95);
    --primary: #4f46e5;
    --primary-hover: #4338ca;
    --primary-glow: rgba(79, 70, 229, 0.15);
    --secondary: #db2777;
    --secondary-hover: #c21a69;
    --text-primary: #0f172a;
    --text-secondary: #475569;
    --text-muted: #64748b;
    --border-color: rgba(0, 0, 0, 0.08);
    --border-color-focus: rgba(79, 70, 229, 0.4);
    
    --success: #059669;
    --warning: #d97706;
    --error: #dc2626;
    --info: #2563eb;
    
    --glass-blur: blur(12px);
    --shadow-premium: 0 10px 30px -10px rgba(0, 0, 0, 0.08), 0 1px 3px rgba(0, 0, 0, 0.03);
    --radius-sm: 8px;
    --radius-md: 14px;
    --radius-lg: 24px;
}

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

body {
    background-color: var(--bg-base);
    background-image: 
        radial-gradient(at 0% 0%, rgba(79, 70, 229, 0.05) 0px, transparent 50%),
        radial-gradient(at 100% 100%, rgba(219, 39, 119, 0.04) 0px, transparent 50%);
    color: var(--text-primary);
    font-family: 'Inter', sans-serif;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6 {
    font-family: 'Outfit', sans-serif;
    font-weight: 600;
    letter-spacing: -0.02em;
    color: #0f172a;
}

/* Container */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* Header Navbar */
.navbar {
    background: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-premium);
    height: 70px;
    display: flex;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 200;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-family: 'Outfit', sans-serif;
    font-size: 20px;
    font-weight: 700;
    color: var(--primary);
    text-decoration: none;
}

.nav-links {
    display: flex;
    align-items: center;
    gap: 20px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    transition: color 0.2s;
}

.nav-link:hover {
    color: var(--primary);
}

/* Glassmorphism Panel */
.glass-panel {
    background: var(--bg-surface);
    backdrop-filter: var(--glass-blur);
    -webkit-backdrop-filter: var(--glass-blur);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-premium);
    border-radius: var(--radius-md);
    transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.glass-panel:hover {
    border-color: rgba(0, 0, 0, 0.12);
    box-shadow: 0 12px 36px -10px rgba(0, 0, 0, 0.12);
}

/* App Layout & Sidebar */
.app-layout {
    display: flex;
    min-height: 100vh;
}

.sidebar {
    width: 260px;
    background: #fff;
    border-right: 1px solid var(--border-color);
    padding: 30px 20px;
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 0;
    bottom: 0;
    left: 0;
    z-index: 100;
}

.sidebar-brand {
    margin-bottom: 30px;
}

.sidebar-links {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 8px;
    flex-grow: 1;
}

.sidebar-link {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
}

.sidebar-link:hover, .sidebar-link.active {
    background: var(--primary-glow);
    color: var(--primary);
}

.sidebar-user {
    padding-top: 20px;
    border-top: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.user-badge {
    display: inline-block;
    padding: 4px 12px;
    background: #e2e8f0;
    color: #475569;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.app-body {
    flex-grow: 1;
    margin-left: 260px;
    padding: 40px 0;
    min-height: 100vh;
}

/* Alerts and Messages */
.messages {
    list-style: none;
    margin-bottom: 24px;
}

.alert {
    padding: 14px 20px;
    border-radius: var(--radius-sm);
    font-size: 14px;
    font-weight: 500;
    margin-bottom: 12px;
    border: 1px solid transparent;
}

.alert-success {
    background-color: #d1fae5;
    color: #065f46;
    border-color: #a7f3d0;
}

.alert-danger, .alert-error {
    background-color: #fee2e2;
    color: #991b1b;
    border-color: #fca5a5;
}

.alert-warning {
    background-color: #fef3c7;
    color: #92400e;
    border-color: #fde68a;
}

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

/* Form Styles */
.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    font-size: 13px;
    font-weight: 600;
    color: var(--text-secondary);
    margin-bottom: 8px;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    font-size: 14px;
    font-family: inherit;
    background: #fff;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-primary);
    transition: all 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-glow);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%23475569' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 12px center;
    background-repeat: no-repeat;
    background-size: 20px;
    padding-right: 40px;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-family: inherit;
    font-size: 14px;
    font-weight: 600;
    border: 1px solid transparent;
    border-radius: var(--radius-sm);
    cursor: pointer;
    text-decoration: none;
    transition: all 0.2s;
}

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

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

.btn-secondary {
    background: #fff;
    color: var(--text-secondary);
    border-color: var(--border-color);
}

.btn-secondary:hover {
    background: #f8fafc;
    color: var(--text-primary);
}

.btn-danger {
    background: var(--error);
    color: #fff;
}

.btn-danger:hover {
    background: #b91c1c;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 12px;
}

/* Auth Cards */
.auth-container {
    max-width: 480px;
    margin: 60px auto;
    padding: 40px;
}

.auth-title {
    text-align: center;
    margin-bottom: 24px;
    font-size: 28px;
}

/* Cards */
.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 24px;
}

.dashboard-stats {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.stat-val {
    font-size: 32px;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
    color: var(--primary);
}

.stat-label {
    font-size: 13px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Subjects list and Exam states */
.subject-card {
    padding: 24px;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.subject-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
}

.subject-title {
    font-size: 18px;
    color: var(--text-primary);
}

.badge {
    display: inline-flex;
    padding: 4px 10px;
    border-radius: 20px;
    font-size: 11px;
    font-weight: 600;
    text-transform: uppercase;
}

.badge-success { background: #d1fae5; color: #065f46; }
.badge-warning { background: #fef3c7; color: #92400e; }
.badge-danger { background: #fee2e2; color: #991b1b; }
.badge-info { background: #dbeafe; color: #1e40af; }

/* Tables */
.table-responsive {
    width: 100%;
    overflow-x: auto;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin: 20px 0;
    font-size: 14px;
    text-align: left;
}

.table th, .table td {
    padding: 16px;
    border-bottom: 1px solid var(--border-color);
}

.table th {
    background: #f8fafc;
    font-weight: 600;
    color: var(--text-secondary);
}

.table tr:hover td {
    background: rgba(0, 0, 0, 0.01);
}

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-top: 24px;
}

/* Exam interface layout */
.exam-layout {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 30px;
    margin-top: 30px;
}

.question-card {
    padding: 30px;
    margin-bottom: 24px;
}

.question-text {
    font-size: 16px;
    font-weight: 500;
    line-height: 1.6;
    margin-bottom: 20px;
}

.options-list {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.option-choice {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 20px;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all 0.2s;
}

.option-choice:hover {
    border-color: var(--primary-glow);
    background: var(--primary-glow);
}

.option-choice.selected {
    border-color: var(--primary);
    background: var(--primary-glow);
}

.option-radio {
    width: 18px;
    height: 18px;
    accent-color: var(--primary);
}

.option-label-badge {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 50%;
    background: #e2e8f0;
    font-weight: 700;
    font-size: 12px;
    color: #475569;
}

.option-choice.selected .option-label-badge {
    background: var(--primary);
    color: #fff;
}

/* Exam Sidebar navigation */
.exam-sidebar-card {
    position: sticky;
    top: 100px;
    padding: 24px;
}

.timer-box {
    text-align: center;
    font-size: 24px;
    font-weight: 700;
    font-family: 'Outfit', sans-serif;
    color: var(--primary);
    padding: 16px;
    border-radius: var(--radius-sm);
    background: var(--primary-glow);
    margin-bottom: 20px;
}

.timer-box.warning {
    color: var(--error);
    background: rgba(220, 38, 38, 0.1);
    animation: pulse 1s infinite alternate;
}

@keyframes pulse {
    0% { opacity: 0.8; }
    100% { opacity: 1; }
}

.nav-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 8px;
    margin-top: 16px;
}

.nav-grid-btn {
    width: 100%;
    aspect-ratio: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: 600;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border-color);
    background: #fff;
    cursor: pointer;
    transition: all 0.2s;
}

.nav-grid-btn.answered {
    background: var(--primary);
    color: #fff;
    border-color: var(--primary);
}

.nav-grid-btn:hover {
    border-color: var(--primary);
}

/* Results layout */
.results-card {
    padding: 40px;
    text-align: center;
    max-width: 700px;
    margin: 0 auto;
}

.score-display {
    font-size: 54px;
    font-weight: 800;
    color: var(--primary);
    margin: 20px 0;
    font-family: 'Outfit', sans-serif;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 16px;
    margin: 30px 0;
}

.result-stat-box {
    padding: 16px;
    border-radius: var(--radius-sm);
    background: #f8fafc;
}

.result-stat-val {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: 4px;
}

.result-stat-label {
    font-size: 11px;
    color: var(--text-muted);
    font-weight: 500;
}

/* Question corrections display */
.correction-item {
    padding: 24px;
    margin-bottom: 20px;
    border-left: 4px solid #cbd5e1;
}

.correction-item.correct {
    border-left-color: var(--success);
    background: rgba(5, 150, 105, 0.02);
}

.correction-item.incorrect {
    border-left-color: var(--error);
    background: rgba(220, 38, 38, 0.02);
}

.correction-options-list {
    margin-top: 16px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.correction-option {
    padding: 10px 16px;
    border-radius: var(--radius-sm);
    font-size: 13px;
    border: 1px solid var(--border-color);
}

.correction-option.correct {
    background: #d1fae5;
    color: #065f46;
    border-color: #a7f3d0;
    font-weight: 500;
}

.correction-option.incorrect-choice {
    background: #fee2e2;
    color: #991b1b;
    border-color: #fca5a5;
    font-weight: 500;
}