/**
 * Face Recognition Attendance System
 * Main Stylesheet
 *
 * Modern, clean, and responsive design
 */

/* ==========================================
   CSS Variables / Theme
   ========================================== */
:root {
    /* Primary Colors */
    --primary-color: #667eea;
    --primary-dark: #5a67d8;
    --primary-light: #7c91f5;

    /* Secondary Colors */
    --secondary-color: #64748b;
    --secondary-dark: #475569;

    /* Status Colors */
    --success-color: #10b981;
    --success-light: #d1fae5;
    --warning-color: #f59e0b;
    --warning-light: #fef3c7;
    --error-color: #ef4444;
    --error-light: #fee2e2;
    --info-color: #3b82f6;
    --info-light: #dbeafe;

    /* Neutral Colors */
    --bg-color: #f1f5f9;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-muted: #94a3b8;
    --border-color: #e2e8f0;

    /* Shadows */
    --shadow-sm: 0 1px 2px 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);

    /* Border Radius */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;

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

    /* Spacing */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-2xl: 48px;
}

/* ==========================================
   Reset & Base Styles
   ========================================== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

/* ==========================================
   Navigation Bar
   ========================================== */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) var(--spacing-xl);
    background: var(--card-bg);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--primary-color);
}

.nav-icon {
    font-size: 1.5rem;
}

.nav-links {
    display: flex;
    gap: var(--spacing-md);
}

.nav-links a {
    text-decoration: none;
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 500;
    transition: all var(--transition-fast);
}

.nav-links a:hover {
    background: var(--bg-color);
    color: var(--primary-color);
}

.nav-links a.active {
    background: var(--primary-color);
    color: white;
}

/* ==========================================
   Main Container & Cards
   ========================================== */
.main-container {
    display: grid;
    grid-template-columns: 1fr 350px;
    gap: var(--spacing-xl);
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-xl);
}

.register-container {
    grid-template-columns: 1fr 300px;
}

.card {
    background: var(--card-bg);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
}

.attendance-card,
.register-card {
    min-height: 600px;
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.card-subtitle {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

/* ==========================================
   Loading Indicator
   ========================================== */
.loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-2xl);
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--border-color);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

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

.loading-indicator p {
    margin-top: var(--spacing-md);
    color: var(--text-secondary);
}

/* ==========================================
   Camera Container
   ========================================== */
.camera-container {
    position: relative;
    width: 100%;
    max-width: 500px;
    margin: 0 auto var(--spacing-lg);
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: #000;
    aspect-ratio: 4/3;
}

.camera-container video {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transform: scaleX(-1);
}

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

.face-status {
    position: absolute;
    bottom: var(--spacing-md);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    background: rgba(0, 0, 0, 0.7);
    border-radius: var(--radius-full);
    color: white;
    font-size: 0.875rem;
}

.face-status.detected {
    background: rgba(16, 185, 129, 0.9);
}

.face-status.not-detected {
    background: rgba(239, 68, 68, 0.9);
}

/* ==========================================
   Confidence Meter
   ========================================== */
.confidence-container {
    margin-bottom: var(--spacing-lg);
    text-align: center;
}

.confidence-container label {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-sm);
}

.confidence-bar {
    width: 100%;
    height: 12px;
    background: var(--border-color);
    border-radius: var(--radius-full);
    overflow: hidden;
}

.confidence-level {
    height: 100%;
    background: linear-gradient(90deg, var(--error-color), var(--warning-color), var(--success-color));
    border-radius: var(--radius-full);
    width: 0%;
    transition: width var(--transition-normal);
}

#confidenceText {
    display: inline-block;
    margin-top: var(--spacing-xs);
    font-weight: 600;
    color: var(--text-primary);
}

/* ==========================================
   Action Buttons
   ========================================== */
.action-buttons {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-xl);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--bg-color);
    color: var(--text-primary);
}

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

.btn-checkin {
    background: var(--success-color);
    color: white;
    flex: 1;
    max-width: 200px;
}

.btn-checkin:hover:not(:disabled) {
    background: #059669;
    transform: translateY(-2px);
}

.btn-checkout {
    background: var(--warning-color);
    color: white;
    flex: 1;
    max-width: 200px;
}

.btn-checkout:hover:not(:disabled) {
    background: #d97706;
    transform: translateY(-2px);
}

.btn-block {
    width: 100%;
}

.btn-icon {
    font-size: 1.25rem;
}

.btn-link {
    background: none;
    border: none;
    color: var(--primary-color);
    cursor: pointer;
    text-decoration: underline;
    font-size: 0.875rem;
}

/* ==========================================
   Location Info
   ========================================== */
.location-info {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--bg-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.location-info.success {
    background: var(--success-light);
    color: var(--success-color);
}

.location-info.error {
    background: var(--error-light);
    color: var(--error-color);
}

/* ==========================================
   Result Display
   ========================================== */
.result-display,
.error-display,
.success-display {
    text-align: center;
    padding: var(--spacing-xl);
}

.result-icon,
.error-icon,
.success-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-md);
}

.result-display h3,
.error-display h3,
.success-display h2 {
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
}

.result-details,
.success-details {
    background: var(--bg-color);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    text-align: left;
}

.result-details p,
.success-details p {
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.result-details p:last-child,
.success-details p:last-child {
    border-bottom: none;
}

/* ==========================================
   Recent Activity List
   ========================================== */
.recent-list,
.users-list {
    max-height: 500px;
    overflow-y: auto;
}

.recent-item,
.user-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    transition: background var(--transition-fast);
}

.recent-item:hover,
.user-item:hover {
    background: var(--bg-color);
}

.recent-item:last-child,
.user-item:last-child {
    border-bottom: none;
}

.recent-avatar,
.user-avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    object-fit: cover;
    background: var(--border-color);
}

.recent-info,
.user-info {
    flex: 1;
}

.recent-name,
.user-name {
    font-weight: 600;
    color: var(--text-primary);
}

.recent-time,
.user-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.recent-type {
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
}

.recent-type.check_in {
    background: var(--success-light);
    color: #065f46;
}

.recent-type.check_out {
    background: var(--warning-light);
    color: #92400e;
}

.no-recent,
.no-users {
    text-align: center;
    color: var(--text-muted);
    padding: var(--spacing-xl);
}

/* ==========================================
   Status Message
   ========================================== */
.status-message {
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    display: none;
}

.status-message.show {
    display: block;
}

.status-message.success {
    background: var(--success-light);
    color: #065f46;
}

.status-message.error {
    background: var(--error-light);
    color: #991b1b;
}

.status-message.warning {
    background: var(--warning-light);
    color: #92400e;
}

.status-message.info {
    background: var(--info-light);
    color: #1e40af;
}

/* ==========================================
   Form Styles
   ========================================== */
.form-group {
    margin-bottom: var(--spacing-lg);
}

.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.form-group input,
.form-group select {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: border-color var(--transition-fast);
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-hint {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.8125rem;
    color: var(--text-muted);
}

.error-message {
    color: var(--error-color);
    font-size: 0.875rem;
    margin-top: var(--spacing-sm);
}

/* ==========================================
   Registration Steps
   ========================================== */
.registration-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-xl);
}

.step {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    opacity: 0.5;
}

.step.active {
    opacity: 1;
}

.step.completed {
    opacity: 1;
}

.step.completed .step-number {
    background: var(--success-color);
}

.step-number {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--border-color);
    color: var(--text-secondary);
    border-radius: 50%;
    font-weight: 600;
    font-size: 0.875rem;
}

.step.active .step-number {
    background: var(--primary-color);
    color: white;
}

.step-connector {
    width: 40px;
    height: 2px;
    background: var(--border-color);
}

.step span {
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.step-content {
    animation: fadeIn var(--transition-normal);
}

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

.current-name {
    text-align: center;
    padding: var(--spacing-md);
    background: var(--bg-color);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
}

/* ==========================================
   Quality Indicators
   ========================================== */
.quality-indicators {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xs);
    font-size: 0.8125rem;
}

.indicator-icon {
    font-size: 1.25rem;
}

.indicator-text {
    color: var(--text-secondary);
}

.indicator-status {
    font-size: 1rem;
}

.indicator.valid .indicator-status {
    content: '✅';
}

/* ==========================================
   Capture Instructions
   ========================================== */
.capture-instructions {
    background: var(--info-light);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
}

.capture-instructions p {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.capture-instructions p:last-child {
    margin-bottom: 0;
}

/* ==========================================
   Capture Overlay / Flash Effect
   ========================================== */
.capture-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: white;
    animation: flash 0.3s ease-out;
}

@keyframes flash {
    0% { opacity: 1; }
    100% { opacity: 0; }
}

/* ==========================================
   Captured Preview
   ========================================== */
.captured-preview {
    width: 150px;
    height: 150px;
    margin: 0 auto var(--spacing-lg);
    border-radius: 50%;
    overflow: hidden;
    border: 4px solid var(--success-color);
    box-shadow: var(--shadow-lg);
}

.captured-preview img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* ==========================================
   Button Group
   ========================================== */
.button-group {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
}

/* ==========================================
   Responsive Design
   ========================================== */
@media (max-width: 1024px) {
    .main-container {
        grid-template-columns: 1fr;
    }

    .recent-card,
    .users-card {
        order: 2;
    }
}

@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-links {
        width: 100%;
        justify-content: center;
    }

    .main-container {
        padding: var(--spacing-md);
    }

    .card {
        padding: var(--spacing-md);
    }

    .action-buttons {
        flex-direction: column;
    }

    .btn-checkin,
    .btn-checkout {
        max-width: 100%;
    }

    .registration-steps {
        flex-wrap: wrap;
    }

    .quality-indicators {
        flex-wrap: wrap;
    }

    .button-group {
        flex-direction: column;
    }
}

@media (max-width: 480px) {
    .card-title {
        font-size: 1.25rem;
    }

    .camera-container {
        aspect-ratio: 1/1;
    }

    .registration-steps span {
        display: none;
    }
}

/* ==========================================
   Print Styles
   ========================================== */
@media print {
    .navbar,
    .action-buttons,
    .btn {
        display: none !important;
    }

    .card {
        box-shadow: none;
        border: 1px solid var(--border-color);
    }
}