/**
 * Face Recognition Attendance System - Web Styles
 * Mobile-first responsive design for tablets
 */

/* ============================================================================
   CSS Variables
   ============================================================================ */

:root {
    /* Colors */
    --primary: #2196F3;
    --primary-dark: #1976D2;
    --primary-light: #BBDEFB;
    --success: #4CAF50;
    --success-dark: #388E3C;
    --danger: #F44336;
    --danger-dark: #D32F2F;
    --warning: #FFC107;
    --warning-dark: #FFA000;
    --info: #00BCD4;

    /* Neutrals */
    --white: #FFFFFF;
    --gray-50: #FAFAFA;
    --gray-100: #F5F5F5;
    --gray-200: #EEEEEE;
    --gray-300: #E0E0E0;
    --gray-400: #BDBDBD;
    --gray-500: #9E9E9E;
    --gray-600: #757575;
    --gray-700: #616161;
    --gray-800: #424242;
    --gray-900: #212121;

    /* Layout */
    --sidebar-width: 250px;
    --sidebar-collapsed-width: 60px;
    --header-height: 60px;
    --border-radius: 8px;
    --border-radius-lg: 12px;

    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);

    /* Transitions */
    --transition-fast: 150ms ease;
    --transition: 250ms ease;
    --transition-slow: 350ms ease;
}

/* ============================================================================
   Reset & Base
   ============================================================================ */

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

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
                 Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    background-color: var(--gray-100);
    color: var(--gray-900);
    line-height: 1.5;
    min-height: 100vh;
    overflow-x: hidden;
}

/* ============================================================================
   Layout
   ============================================================================ */

.app-container {
    display: flex;
    min-height: 100vh;
}

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 24px;
    transition: margin-left var(--transition);
}

.main-content.full-width {
    margin-left: 0;
}

/* ============================================================================
   Sidebar Navigation
   ============================================================================ */

.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: var(--sidebar-width);
    height: 100vh;
    background: var(--white);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    z-index: 100;
    transition: transform var(--transition), width var(--transition);
}

.sidebar.collapsed {
    transform: translateX(calc(-1 * var(--sidebar-width)));
}

.sidebar-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--gray-200);
}

.sidebar-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    justify-content: space-around;
    width: 24px;
    height: 20px;
    background: transparent;
    border: none;
    cursor: pointer;
    padding: 0;
}

.menu-toggle span {
    width: 100%;
    height: 2px;
    background-color: var(--gray-700);
    transition: var(--transition);
}

.nav-menu {
    list-style: none;
    padding: 16px 0;
    flex: 1;
    overflow-y: auto;
}

.nav-item a {
    display: flex;
    align-items: center;
    padding: 14px 20px;
    color: var(--gray-700);
    text-decoration: none;
    transition: var(--transition-fast);
}

.nav-item a:hover {
    background-color: var(--gray-100);
    color: var(--primary);
}

.nav-item.active a {
    background-color: var(--primary-light);
    color: var(--primary-dark);
    font-weight: 500;
}

.nav-icon {
    width: 24px;
    height: 24px;
    margin-right: 12px;
    flex-shrink: 0;
}

.sidebar-footer {
    padding: 16px 20px;
    border-top: 1px solid var(--gray-200);
}

.logout-btn {
    display: flex;
    align-items: center;
    width: 100%;
    padding: 12px 16px;
    background-color: var(--gray-100);
    border: none;
    border-radius: var(--border-radius);
    color: var(--gray-700);
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

/* ============================================================================
   Page Header
   ============================================================================ */

.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 24px;
    flex-wrap: wrap;
    gap: 16px;
}

.page-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--gray-900);
}

.current-time {
    font-size: 1rem;
    color: var(--gray-600);
    font-family: monospace;
}

/* ============================================================================
   Buttons
   ============================================================================ */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 24px;
    font-size: 1rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
    min-height: 44px; /* Touch-friendly */
}

.btn svg {
    width: 20px;
    height: 20px;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
}

.btn-secondary {
    background-color: var(--gray-200);
    color: var(--gray-700);
}

.btn-secondary:hover:not(:disabled) {
    background-color: var(--gray-300);
}

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

.btn-success:hover:not(:disabled) {
    background-color: var(--success-dark);
}

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

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger-dark);
}

.btn-large {
    padding: 16px 32px;
    font-size: 1.125rem;
    min-height: 56px;
}

.btn-block {
    width: 100%;
}

.btn-sm {
    padding: 8px 16px;
    font-size: 0.875rem;
    min-height: 36px;
}

.btn-loader {
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

/* ============================================================================
   Forms
   ============================================================================ */

.form-group {
    margin-bottom: 20px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: var(--gray-700);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 14px 16px;
    font-size: 1rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    background-color: var(--white);
    transition: var(--transition-fast);
    min-height: 48px;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px var(--primary-light);
}

.form-group input::placeholder {
    color: var(--gray-400);
}

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

.form-select {
    width: 100%;
    padding: 12px 16px;
    font-size: 1rem;
    border: 2px solid var(--gray-300);
    border-radius: var(--border-radius);
    background-color: var(--white);
    cursor: pointer;
}

/* ============================================================================
   Login Page
   ============================================================================ */

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 24px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
}

.login-card {
    width: 100%;
    max-width: 400px;
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    padding: 40px;
}

.login-header {
    text-align: center;
    margin-bottom: 32px;
}

.login-icon {
    width: 64px;
    height: 64px;
    color: var(--primary);
    margin-bottom: 16px;
}

.login-header h1 {
    font-size: 1.5rem;
    color: var(--gray-900);
    margin-bottom: 8px;
}

.login-header p {
    color: var(--gray-600);
}

.login-footer {
    margin-top: 24px;
    text-align: center;
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* ============================================================================
   Attendance Page
   ============================================================================ */

.attendance-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.camera-section,
.status-section {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    padding: 24px;
}

.camera-container {
    position: relative;
    width: 100%;
    aspect-ratio: 4/3;
    background-color: var(--gray-900);
    border-radius: var(--border-radius);
    overflow: hidden;
}

.camera-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1); /* Mirror for selfie cam */
}

.camera-container canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    transform: scaleX(-1);
}

.camera-placeholder {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--gray-800);
    color: var(--white);
}

.camera-placeholder svg {
    width: 64px;
    height: 64px;
    margin-bottom: 16px;
    opacity: 0.6;
}

.camera-placeholder p {
    margin-bottom: 16px;
    opacity: 0.8;
}

.face-indicator {
    position: absolute;
    bottom: 16px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 16px;
    background-color: rgba(0, 0, 0, 0.7);
    border-radius: 20px;
    color: var(--white);
    font-size: 0.875rem;
}

.indicator-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--gray-500);
}

.face-indicator.scanning .indicator-dot {
    background-color: var(--warning);
    animation: pulse 1s infinite;
}

.face-indicator.matched .indicator-dot {
    background-color: var(--success);
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.camera-controls {
    display: flex;
    gap: 16px;
    margin-top: 20px;
}

.camera-controls .btn {
    flex: 1;
}

/* Auto Mode Indicator */
.auto-mode-indicator {
    text-align: center;
    padding: 16px;
    margin-top: 20px;
    background: linear-gradient(135deg, var(--primary-light) 0%, rgba(33, 150, 243, 0.1) 100%);
    border-radius: var(--border-radius);
    border: 2px dashed var(--primary);
}

.auto-badge {
    display: inline-block;
    padding: 6px 16px;
    background-color: var(--primary);
    color: white;
    font-weight: 600;
    font-size: 0.875rem;
    border-radius: 20px;
    letter-spacing: 1px;
    animation: pulse-badge 2s ease-in-out infinite;
}

@keyframes pulse-badge {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.auto-mode-indicator p {
    margin-top: 8px;
    color: var(--gray-600);
    font-size: 0.875rem;
}

/* Confirmation Styles */
.result-confirmed {
    display: flex;
    align-items: center;
    gap: 20px;
    width: 100%;
    animation: slide-in 0.3s ease-out;
}

@keyframes slide-in {
    from {
        opacity: 0;
        transform: translateY(-10px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.result-confirmed.check-in .confirmed-avatar {
    background-color: var(--success);
}

.result-confirmed.check-out .confirmed-avatar {
    background-color: var(--danger);
}

.confirmed-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    animation: pop-in 0.3s ease-out;
}

@keyframes pop-in {
    0% { transform: scale(0); }
    70% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.confirmed-avatar svg {
    width: 48px;
    height: 48px;
    color: white;
}

.scanning-avatar {
    background-color: var(--warning);
    animation: scanning-pulse 1s ease-in-out infinite;
}

@keyframes scanning-pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

.action-text {
    font-size: 1.25rem;
    font-weight: 600;
    margin: 8px 0;
}

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

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

.time-text {
    color: var(--gray-500);
    font-family: monospace;
    font-size: 1rem;
}

.processing-text {
    color: var(--warning);
    font-size: 0.875rem;
    margin-top: 8px;
    animation: blink 1s ease-in-out infinite;
}

@keyframes blink {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

/* Recognition Result */
.recognition-result {
    min-height: 120px;
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-bottom: 24px;
}

.result-placeholder {
    text-align: center;
    color: var(--gray-500);
}

.result-placeholder svg {
    width: 48px;
    height: 48px;
    margin-bottom: 12px;
    opacity: 0.5;
}

.result-matched {
    display: flex;
    align-items: center;
    gap: 20px;
    width: 100%;
}

.result-avatar {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    background-color: var(--success);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.result-avatar svg {
    width: 48px;
    height: 48px;
    color: var(--white);
}

.result-info {
    flex: 1;
}

.result-info h3 {
    font-size: 1.25rem;
    color: var(--gray-900);
    margin-bottom: 4px;
}

.result-info p {
    color: var(--gray-600);
    margin-bottom: 8px;
}

.confidence-bar {
    height: 6px;
    background-color: var(--gray-200);
    border-radius: 3px;
    overflow: hidden;
    margin-bottom: 4px;
}

.confidence-fill {
    height: 100%;
    background-color: var(--success);
    transition: width var(--transition);
}

.confidence-text {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* Today Stats */
.today-stats h3,
.recent-activity h3 {
    font-size: 1rem;
    font-weight: 600;
    color: var(--gray-700);
    margin-bottom: 16px;
}

.stats-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 16px;
}

.stat-card {
    background-color: var(--gray-50);
    padding: 16px;
    border-radius: var(--border-radius);
    text-align: center;
}

.stat-value {
    display: block;
    font-size: 2rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* Recent Activity */
.recent-activity {
    margin-top: 24px;
}

.activity-list {
    list-style: none;
}

.activity-placeholder {
    color: var(--gray-500);
    text-align: center;
    padding: 20px;
}

.activity-item {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px;
    border-bottom: 1px solid var(--gray-200);
}

.activity-item:last-child {
    border-bottom: none;
}

.activity-name {
    font-weight: 500;
    color: var(--gray-900);
}

.activity-action {
    color: var(--gray-600);
    font-size: 0.875rem;
}

.activity-item.check_in .activity-action {
    color: var(--success);
}

.activity-item.check_out .activity-action {
    color: var(--danger);
}

.activity-time {
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--gray-500);
    font-family: monospace;
}

/* ============================================================================
   Registration Page
   ============================================================================ */

.register-container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 24px;
}

.register-form-section {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    padding: 24px;
}

.capture-progress {
    margin-top: 20px;
}

.progress-bar {
    height: 8px;
    background-color: var(--gray-200);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary);
    transition: width var(--transition);
}

.progress-text {
    margin-top: 8px;
    font-size: 0.875rem;
    color: var(--gray-600);
    text-align: center;
}

.captured-faces {
    display: flex;
    justify-content: center;
    gap: 12px;
    margin: 20px 0;
}

.face-sample {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background-color: var(--gray-200);
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
}

.face-sample:not(.empty) {
    background-color: var(--success);
    color: var(--white);
}

.face-sample svg {
    width: 24px;
    height: 24px;
}

/* ============================================================================
   Employees Page
   ============================================================================ */

.employees-container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    padding: 24px;
}

.search-bar {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background-color: var(--gray-100);
    border-radius: var(--border-radius);
    margin-bottom: 24px;
}

.search-bar svg {
    width: 20px;
    height: 20px;
    color: var(--gray-500);
}

.search-bar input {
    flex: 1;
    border: none;
    background: transparent;
    font-size: 1rem;
    outline: none;
}

.employees-stats {
    display: flex;
    gap: 24px;
    margin-bottom: 24px;
}

.employees-table-container {
    overflow-x: auto;
}

.employees-table {
    width: 100%;
    border-collapse: collapse;
}

.employees-table th,
.employees-table td {
    padding: 14px 16px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.employees-table th {
    background-color: var(--gray-50);
    font-weight: 600;
    color: var(--gray-700);
}

.employees-table tbody tr:hover {
    background-color: var(--gray-50);
}

.status-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: 500;
}

.status-badge.status-in {
    background-color: rgba(76, 175, 80, 0.15);
    color: var(--success-dark);
}

.status-badge.status-out {
    background-color: rgba(33, 150, 243, 0.15);
    color: var(--primary-dark);
}

.status-badge.status-absent {
    background-color: rgba(244, 67, 54, 0.15);
    color: var(--danger-dark);
}

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

.loading-spinner {
    width: 32px;
    height: 32px;
    border: 3px solid var(--gray-200);
    border-top-color: var(--primary);
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
    margin: 0 auto 12px;
}

.empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 48px;
    text-align: center;
}

.empty-state svg {
    width: 64px;
    height: 64px;
    color: var(--gray-400);
    margin-bottom: 16px;
}

.empty-state h3 {
    font-size: 1.25rem;
    color: var(--gray-700);
    margin-bottom: 8px;
}

.empty-state p {
    color: var(--gray-500);
    margin-bottom: 24px;
}

/* ============================================================================
   Calendar Page
   ============================================================================ */

.calendar-container {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow);
    padding: 24px;
}

.calendar-nav {
    display: flex;
    align-items: center;
    gap: 16px;
}

.calendar-title {
    font-size: 1.25rem;
    font-weight: 600;
    min-width: 160px;
    text-align: center;
}

.calendar-filters {
    margin-bottom: 24px;
}

.calendar-legend {
    display: flex;
    flex-wrap: wrap;
    gap: 16px;
    margin-bottom: 24px;
    padding: 12px;
    background-color: var(--gray-50);
    border-radius: var(--border-radius);
}

.legend-item {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 0.875rem;
    color: var(--gray-600);
}

.legend-color {
    width: 16px;
    height: 16px;
    border-radius: 4px;
}

.legend-color.present {
    background-color: var(--success);
}

.legend-color.half-day {
    background-color: var(--warning);
}

.legend-color.absent {
    background-color: var(--gray-300);
}

.legend-color.weekend {
    background-color: var(--gray-200);
}

.calendar-grid {
    margin-bottom: 24px;
}

.calendar-header {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
    margin-bottom: 8px;
}

.day-name {
    padding: 12px 8px;
    text-align: center;
    font-weight: 600;
    color: var(--gray-600);
    font-size: 0.875rem;
}

.calendar-body {
    display: grid;
    grid-template-columns: repeat(7, 1fr);
    gap: 4px;
}

.calendar-day {
    aspect-ratio: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background-color: var(--gray-100);
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-fast);
    position: relative;
}

.calendar-day:hover:not(.empty) {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.calendar-day.empty {
    background-color: transparent;
    cursor: default;
}

.calendar-day.present {
    background-color: var(--success);
    color: var(--white);
}

.calendar-day.half-day {
    background-color: var(--warning);
    color: var(--gray-900);
}

.calendar-day.absent {
    background-color: var(--gray-200);
}

.calendar-day.weekend {
    background-color: var(--gray-100);
    color: var(--gray-500);
}

.calendar-day.today {
    outline: 3px solid var(--primary);
    outline-offset: -3px;
}

.day-number {
    font-size: 1rem;
    font-weight: 500;
}

.attendee-count {
    font-size: 0.75rem;
    opacity: 0.8;
}

.month-summary h3 {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 16px;
}

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

.summary-card {
    background-color: var(--gray-50);
    padding: 20px;
    border-radius: var(--border-radius);
    text-align: center;
}

.summary-value {
    display: block;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
    margin-bottom: 4px;
}

.summary-label {
    font-size: 0.875rem;
    color: var(--gray-600);
}

/* Day Details Table */
.day-details-table {
    width: 100%;
    border-collapse: collapse;
}

.day-details-table th,
.day-details-table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid var(--gray-200);
}

.day-details-table th {
    background-color: var(--gray-50);
    font-weight: 600;
}

/* ============================================================================
   Modal
   ============================================================================ */

.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 1000;
    padding: 24px;
}

.modal.show {
    opacity: 1;
    visibility: visible;
}

.modal-content {
    background: var(--white);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    transform: translateY(-20px);
    transition: var(--transition);
}

.modal.show .modal-content {
    transform: translateY(0);
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 20px;
    border-bottom: 1px solid var(--gray-200);
}

.modal-header h3 {
    font-size: 1.25rem;
    font-weight: 600;
}

.modal-close {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: transparent;
    border: none;
    font-size: 1.5rem;
    color: var(--gray-500);
    cursor: pointer;
    border-radius: var(--border-radius);
}

.modal-close:hover {
    background-color: var(--gray-100);
}

.modal-body {
    padding: 20px;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 12px;
    padding: 16px 20px;
    border-top: 1px solid var(--gray-200);
}

/* ============================================================================
   Toast Notifications
   ============================================================================ */

.toast-container {
    position: fixed;
    top: 24px;
    right: 24px;
    z-index: 1100;
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.toast {
    display: flex;
    align-items: center;
    gap: 12px;
    min-width: 300px;
    max-width: 400px;
    padding: 16px;
    background: var(--white);
    border-radius: var(--border-radius);
    box-shadow: var(--shadow-lg);
    transform: translateX(120%);
    transition: var(--transition);
}

.toast.show {
    transform: translateX(0);
}

.toast-success {
    border-left: 4px solid var(--success);
}

.toast-error {
    border-left: 4px solid var(--danger);
}

.toast-info {
    border-left: 4px solid var(--primary);
}

.toast-message {
    flex: 1;
}

.toast-close {
    background: transparent;
    border: none;
    font-size: 1.25rem;
    color: var(--gray-500);
    cursor: pointer;
}

/* ============================================================================
   Utility Classes
   ============================================================================ */

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

.text-muted {
    color: var(--gray-500);
}

/* ============================================================================
   Responsive Styles
   ============================================================================ */

@media (max-width: 1024px) {
    .attendance-container,
    .register-container {
        grid-template-columns: 1fr;
    }

    .summary-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .main-content {
        margin-left: 0;
        padding: 16px;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar:not(.collapsed) {
        transform: translateX(0);
    }

    .menu-toggle {
        display: flex;
    }

    .page-header {
        flex-direction: column;
        align-items: flex-start;
    }

    .page-header h1 {
        font-size: 1.5rem;
    }

    .camera-controls {
        flex-direction: column;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

    .employees-stats {
        flex-direction: column;
    }

    .calendar-legend {
        flex-direction: column;
        gap: 8px;
    }

    .summary-grid {
        grid-template-columns: 1fr 1fr;
    }

    .toast-container {
        top: auto;
        bottom: 24px;
        left: 16px;
        right: 16px;
    }

    .toast {
        min-width: auto;
        max-width: none;
    }

    /* Hide table columns on mobile */
    .employees-table th:nth-child(4),
    .employees-table td:nth-child(4) {
        display: none;
    }
}

@media (max-width: 480px) {
    .login-card {
        padding: 24px;
    }

    .calendar-header .day-name {
        font-size: 0.75rem;
        padding: 8px 4px;
    }

    .calendar-day {
        font-size: 0.875rem;
    }

    .captured-faces {
        gap: 8px;
    }

    .face-sample {
        width: 40px;
        height: 40px;
    }
}

/* ============================================================================
   Guest Header (Login Button for Non-Logged-In Users)
   ============================================================================ */

.guest-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 25px;
    background: var(--primary);
    color: white;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
}

.guest-header h2 {
    margin: 0;
    font-size: 20px;
    font-weight: 600;
}

.login-btn-header {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    background: white;
    color: var(--primary);
    text-decoration: none;
    border-radius: 25px;
    font-weight: 600;
    font-size: 14px;
    transition: all 0.2s;
}

.login-btn-header:hover {
    background: var(--gray-100);
    transform: translateY(-1px);
    box-shadow: var(--shadow);
}

.login-btn-header .nav-icon {
    width: 18px;
    height: 18px;
}

/* Adjust main content when guest header is shown */
.full-width {
    margin-top: 70px !important;
    margin-left: 0 !important;
}