/* Global Variables and Color System */
:root {
    --bg-dark: #0a0b10;
    --bg-card: rgba(20, 22, 35, 0.7);
    --border-color: rgba(255, 255, 255, 0.08);
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --primary-glow: rgba(99, 102, 241, 0.4);
    --success-color: #10b981;
    --success-hover: #059669;
    --danger-color: #ef4444;
    --danger-hover: #dc2626;
    --text-main: #f3f4f6;
    --text-muted: #9ca3af;
    --transition-speed: 0.3s;
}

/* Reset and Layout */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Inter', 'Prompt', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    overflow-x: hidden;
    position: relative;
}

/* Ambient Background Glows */
.background-glow {
    position: absolute;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, var(--primary-glow) 0%, rgba(0,0,0,0) 70%);
    top: -200px;
    left: -200px;
    z-index: -1;
    pointer-events: none;
    filter: blur(80px);
    opacity: 0.6;
    animation: pulseGlow 15s infinite alternate;
}

@keyframes pulseGlow {
    0% { transform: scale(1) translate(0, 0); }
    100% { transform: scale(1.2) translate(100px, 50px); }
}

/* App Header styling */
.app-header {
    background: rgba(10, 11, 16, 0.8);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border-color);
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 100;
}

.header-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.logo-icon {
    font-size: 1.75rem;
    background: linear-gradient(135deg, var(--primary-color), var(--success-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.logo-text h2 {
    font-size: 1.1rem;
    font-weight: 600;
    letter-spacing: -0.02em;
}

.logo-text p {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.header-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-button {
    background: transparent;
    border: 1px solid transparent;
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.85rem;
    font-family: inherit;
    transition: all var(--transition-speed);
}

.nav-button:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

.nav-button.active {
    color: var(--text-main);
    background: rgba(99, 102, 241, 0.15);
    border-color: rgba(99, 102, 241, 0.3);
}

/* Main Container and Cards */
.app-main {
    flex: 1;
    padding: 2rem;
    display: flex;
    justify-content: center;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.view-card {
    background: var(--bg-card);
    backdrop-filter: blur(16px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 2.5rem;
    width: 100%;
    max-width: 600px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
    display: none;
    animation: fadeInUp 0.4s ease-out forwards;
}

.view-card.wide-card {
    max-width: 1000px;
}

.view-card.active {
    display: block;
}

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

.card-header {
    margin-bottom: 2rem;
}

.card-header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(to right, #ffffff, #d1d5db);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.card-header p {
    color: var(--text-muted);
    font-size: 0.9rem;
    line-height: 1.5;
}

/* Input Fields and Buttons */
.input-group {
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.input-group label {
    font-size: 0.85rem;
    color: var(--text-muted);
    font-weight: 500;
}

.input-group input, select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.75rem 1rem;
    border-radius: 8px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.95rem;
    transition: all var(--transition-speed);
}

select {
    cursor: pointer;
}

.input-group input:focus, select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.25);
    background: rgba(255, 255, 255, 0.08);
}

select option {
    background-color: var(--bg-dark);
    color: var(--text-main);
}

.btn-primary, .btn-secondary, .btn-success, .btn-danger, .btn-back {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    font-family: inherit;
    transition: all var(--transition-speed);
    display: inline-flex;
    justify-content: center;
    align-items: center;
    gap: 0.5rem;
    border: none;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    box-shadow: 0 0 12px var(--primary-glow);
}

.btn-secondary {
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-main);
}

.btn-secondary:hover {
    background-color: rgba(255, 255, 255, 0.15);
}

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

.btn-success:hover {
    background-color: var(--success-hover);
    box-shadow: 0 0 12px rgba(16, 185, 129, 0.4);
}

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

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

.btn-back {
    background: transparent;
    color: var(--text-muted);
    border: 1px solid var(--border-color);
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
}

.btn-back:hover {
    color: var(--text-main);
    background: rgba(255, 255, 255, 0.05);
}

#form-login button {
    width: 100%;
    margin-top: 1rem;
}

/* Home Portal Specific Styling */
.course-list {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.course-card-item {
    background: rgba(255, 255, 255, 0.02);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.course-card-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: rgba(99, 102, 241, 0.3);
}

.course-badge {
    display: inline-block;
    background: rgba(99, 102, 241, 0.2);
    color: #818cf8;
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    border-radius: 6px;
    margin-bottom: 0.5rem;
    font-weight: 600;
}

.course-card-header h3 {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.course-card-header p {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-bottom: 1rem;
}

.course-card-body {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-top: 1px solid var(--border-color);
    padding-top: 1rem;
}

.course-card-body p {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 500;
}

.expand-icon {
    font-size: 0.8rem;
    color: var(--text-muted);
    transition: transform var(--transition-speed);
}

.course-card-item:hover .expand-icon {
    color: var(--text-main);
}

.exam-sets-container {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: 1rem;
    animation: fadeIn var(--transition-speed) ease-out;
}

.exam-set-item {
    background: rgba(255, 255, 255, 0.01);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 1rem 1.25rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.exam-set-item:hover:not(.disabled) {
    background: rgba(99, 102, 241, 0.05);
    border-color: var(--primary-color);
    transform: translateX(4px);
}

.exam-set-info {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
}

.set-badge {
    display: inline-block;
    align-self: flex-start;
    font-size: 0.7rem;
    font-weight: 600;
    padding: 0.15rem 0.4rem;
    border-radius: 4px;
}

.set-badge.active {
    background: rgba(16, 185, 129, 0.15);
    color: var(--success-color);
}

.set-badge.locked {
    background: rgba(255, 255, 255, 0.05);
    color: var(--text-muted);
}

.exam-set-info h4 {
    font-size: 0.95rem;
    font-weight: 600;
}

.exam-set-info p {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.set-action-icon {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-muted);
}

.exam-set-item:hover:not(.disabled) .set-action-icon {
    color: var(--primary-color);
}

.exam-set-item.disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Quiz Specific Styling */
.quiz-info-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1rem;
    margin-bottom: 1.5rem;
    font-size: 0.85rem;
}

.student-meta {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    color: var(--text-muted);
}

.quiz-progress {
    font-weight: 600;
    color: var(--primary-color);
}

/* Question Styles */
.question-card {
    display: none;
    animation: fadeIn 0.3s ease-out;
}

.question-card.active {
    display: block;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.question-title {
    font-size: 1.15rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
    line-height: 1.6;
}

.choices-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-bottom: 2rem;
}

.choice-option {
    display: flex;
    align-items: center;
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 0.85rem 1rem;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.choice-option:hover {
    background: rgba(255, 255, 255, 0.06);
    border-color: rgba(255, 255, 255, 0.2);
}

.choice-option input[type="radio"] {
    margin-right: 1rem;
    accent-color: var(--primary-color);
    width: 1.1rem;
    height: 1.1rem;
}

.choice-option.selected {
    background: rgba(99, 102, 241, 0.08);
    border-color: var(--primary-color);
}

.quiz-navigation-controls {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

/* Result Styles */
.result-score-badge {
    display: inline-flex;
    align-items: baseline;
    justify-content: center;
    background: rgba(16, 185, 129, 0.1);
    border: 2px solid var(--success-color);
    padding: 1.5rem 2.5rem;
    border-radius: 50%;
    margin-bottom: 1.5rem;
}

#display-score-value {
    font-size: 3.5rem;
    font-weight: 800;
    color: var(--success-color);
}

.total-score {
    font-size: 1.25rem;
    color: var(--text-muted);
}

.result-summary-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.5rem;
    margin: 1.5rem 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.summary-row {
    display: flex;
    justify-content: space-between;
    font-size: 0.95rem;
}

.summary-row span {
    color: var(--text-muted);
}

.badge-status {
    color: var(--success-color);
}

.result-notice {
    padding: 1rem;
    border-radius: 8px;
    font-size: 0.85rem;
    margin-bottom: 2rem;
    line-height: 1.5;
}

.result-notice.warning {
    background: rgba(245, 158, 11, 0.1);
    border: 1px solid #f59e0b;
    color: #fbbf24;
}

/* Dashboard Styles */
.dashboard-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 1.5rem;
    margin-bottom: 2rem;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.25rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: rgba(255, 255, 255, 0.03);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    padding: 1.25rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.stat-title {
    font-size: 0.8rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-val {
    font-size: 1.5rem;
    font-weight: 700;
}

.text-success {
    color: var(--success-color);
}

.text-danger {
    color: var(--danger-color);
}

/* Table Design */
.table-container {
    background: rgba(0, 0, 0, 0.2);
    border: 1px solid var(--border-color);
    border-radius: 12px;
    overflow: hidden;
}

.table-actions {
    display: flex;
    justify-content: space-between;
    padding: 1rem;
    border-bottom: 1px solid var(--border-color);
    gap: 1rem;
}

#table-search {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 6px;
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.85rem;
}

#table-search:focus {
    outline: none;
    border-color: var(--primary-color);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: 0.9rem;
    text-align: left;
}

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

.data-table th {
    background: rgba(255, 255, 255, 0.02);
    font-weight: 600;
    color: var(--text-muted);
}

.data-table tr:hover {
    background: rgba(255, 255, 255, 0.01);
}

/* Delete Row Button Styling */
.btn-delete-row {
    background: rgba(239, 68, 68, 0.15);
    color: #f87171;
    border: 1px solid rgba(239, 68, 68, 0.3);
    padding: 0.35rem 0.75rem;
    font-size: 0.8rem;
    font-weight: 600;
    border-radius: 6px;
    cursor: pointer;
    transition: all var(--transition-speed);
}

.btn-delete-row:hover {
    background: var(--danger-color);
    color: white;
    border-color: var(--danger-color);
    box-shadow: 0 0 8px rgba(239, 68, 68, 0.4);
}

.text-center {
    text-align: center;
}

/* Error message styling */
.error-msg {
    color: var(--danger-color);
    font-size: 0.85rem;
    margin-top: 0.5rem;
}

/* Footer Styling */
.app-footer {
    border-top: 1px solid var(--border-color);
    padding: 1.5rem;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.75rem;
}

/* Utility classes */
.hidden {
    display: none !important;
}