/* ============================================
   Advanced Facial Recognition System - Styles
   ============================================ */

:root {
    /* Colors */
    --primary: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary: #64748b;
    --success: #22c55e;
    --danger: #ef4444;
    --warning: #f59e0b;
    
    /* Backgrounds */
    --bg-dark: #0f172a;
    --bg-darker: #020617;
    --bg-card: #1e293b;
    --bg-card-hover: #334155;
    --bg-input: #0f172a;
    
    /* Text */
    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    
    /* Borders */
    --border-color: #334155;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.4);
    
    /* Spacing */
    --sidebar-width: 260px;
    
    /* Transitions */
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background-color: var(--bg-darker);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
}

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

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

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

.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-dark);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
}

.sidebar-header {
    padding: 1.5rem;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    border-bottom: 1px solid var(--border-color);
}

.logo-icon {
    font-size: 2rem;
    color: var(--primary);
}

.sidebar-header h1 {
    font-size: 1.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-light), var(--primary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.nav-menu {
    list-style: none;
    padding: 1rem 0;
    flex: 1;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.5rem;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition);
    border-left: 3px solid transparent;
}

.nav-item:hover {
    background: var(--bg-card);
    color: var(--text-primary);
}

.nav-item.active {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-light);
    border-left-color: var(--primary);
}

.nav-item i {
    width: 20px;
    text-align: center;
}

.sidebar-footer {
    padding: 1rem 1.5rem;
    border-top: 1px solid var(--border-color);
}

.stats-mini {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    color: var(--text-secondary);
    font-size: 0.875rem;
}

.stats-mini i {
    color: var(--primary);
}

/* ============================================
   Main Content
   ============================================ */

.main-content {
    flex: 1;
    margin-left: var(--sidebar-width);
    padding: 2rem;
    min-height: 100vh;
}

.section {
    display: none;
    max-width: 900px;
    margin: 0 auto;
}

.section.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

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

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

.section-header h2 {
    font-size: 1.75rem;
    font-weight: 600;
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
}

.section-header h2 i {
    color: var(--primary);
}

.section-header p {
    color: var(--text-secondary);
}

/* ============================================
   Cards
   ============================================ */

.card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

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

.card-header h3 {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
}

.card-header h3 i {
    color: var(--primary);
}

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

.form-group {
    margin-bottom: 1.25rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-secondary);
}

.input {
    width: 100%;
    padding: 0.75rem 1rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition);
}

.input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}

.input::placeholder {
    color: var(--text-muted);
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    font-size: 0.95rem;
    font-weight: 500;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition);
}

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

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

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

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

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

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

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
}

.btn-block {
    width: 100%;
    margin-top: 1rem;
}

.btn-sm {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
}

.btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    border-radius: 50%;
    background: rgba(0, 0, 0, 0.5);
    color: white;
}

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

/* ============================================
   Tabs
   ============================================ */

.upload-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tab-btn {
    flex: 1;
    padding: 0.75rem;
    background: var(--bg-input);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.tab-btn:hover {
    background: var(--bg-card-hover);
}

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

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* ============================================
   Upload Area
   ============================================ */

.upload-area {
    border: 2px dashed var(--border-color);
    border-radius: 12px;
    padding: 2.5rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    margin-bottom: 1rem;
}

.upload-area:hover, .upload-area.dragover {
    border-color: var(--primary);
    background: rgba(99, 102, 241, 0.05);
}

.upload-area i {
    font-size: 3rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.upload-area p {
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.upload-area p span {
    color: var(--primary);
    cursor: pointer;
}

.upload-area small {
    color: var(--text-muted);
}

/* ============================================
   Preview Container
   ============================================ */

.preview-container {
    position: relative;
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.preview-container img {
    width: 100%;
    max-height: 400px;
    object-fit: contain;
    background: var(--bg-input);
    border-radius: 12px;
}

.preview-container .btn-icon {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
}

/* ============================================
   Camera
   ============================================ */

.camera-container {
    position: relative;
    background: var(--bg-input);
    border-radius: 12px;
    overflow: hidden;
    margin-bottom: 1rem;
}

.camera-container video {
    width: 100%;
    display: block;
}

.camera-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    background: var(--bg-input);
    color: var(--text-muted);
}

.camera-overlay i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.camera-overlay.hidden {
    display: none;
}

.camera-controls {
    display: flex;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

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

/* ============================================
   Result Cards
   ============================================ */

.result-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 2rem;
    border: 1px solid var(--border-color);
    text-align: center;
    animation: slideUp 0.3s ease;
}

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

.result-icon {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 2.5rem;
}

.result-icon.success {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

.result-icon.error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.result-card h3 {
    margin-bottom: 0.5rem;
}

.result-card p {
    color: var(--text-secondary);
}

/* ============================================
   Recognition Results
   ============================================ */

.result-image-container {
    margin: 1rem 0;
    border-radius: 12px;
    overflow: hidden;
}

.result-image-container img {
    width: 100%;
    max-height: 400px;
    object-fit: contain;
}

.faces-list {
    margin-top: 1rem;
    text-align: left;
}

.face-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1rem;
    background: var(--bg-input);
    border-radius: 8px;
    margin-bottom: 0.5rem;
}

.face-item .name {
    font-weight: 600;
}

.face-item .confidence {
    font-size: 0.875rem;
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
}

.face-item.known .confidence {
    background: rgba(34, 197, 94, 0.1);
    color: var(--success);
}

.face-item.unknown .confidence {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

/* ============================================
   Verify Section
   ============================================ */

.verify-grid {
    display: grid;
    grid-template-columns: 1fr auto 1fr;
    gap: 1rem;
    align-items: center;
    margin-bottom: 1rem;
}

.verify-vs {
    width: 50px;
    height: 50px;
    border-radius: 50%;
    background: var(--bg-card);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    color: var(--primary);
    border: 2px solid var(--border-color);
}

.verify-grid .card {
    margin-bottom: 0;
}

.verify-grid .card h4 {
    margin-bottom: 1rem;
    color: var(--text-secondary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.verify-grid .upload-area {
    padding: 1.5rem;
}

.verify-grid .upload-area i {
    font-size: 2rem;
}

/* Similarity Meter */
.similarity-meter {
    width: 100%;
    height: 24px;
    background: var(--bg-input);
    border-radius: 12px;
    overflow: hidden;
    position: relative;
    margin-bottom: 1.5rem;
}

.similarity-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--danger), var(--warning), var(--success));
    border-radius: 12px;
    transition: width 0.5s ease;
}

.similarity-value {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 700;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.5);
}

.verify-result-content .result-icon {
    width: 60px;
    height: 60px;
    font-size: 1.75rem;
}

/* ============================================
   Database Section
   ============================================ */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 1.5rem;
}

.stat-card {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    text-align: center;
    border: 1px solid var(--border-color);
}

.stat-card i {
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 0.5rem;
}

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

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

/* Table */
.table-container {
    overflow-x: auto;
}

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

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

.data-table th {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.875rem;
    text-transform: uppercase;
}

.data-table tr:hover {
    background: var(--bg-input);
}

.data-table .actions {
    display: flex;
    gap: 0.5rem;
}

.empty-state {
    padding: 3rem;
    text-align: center;
    color: var(--text-muted);
}

.empty-state i {
    font-size: 3rem;
    margin-bottom: 1rem;
}

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

.toast-container {
    position: fixed;
    bottom: 1.5rem;
    right: 1.5rem;
    z-index: 1000;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 1.25rem;
    background: var(--bg-card);
    border-radius: 8px;
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    animation: slideIn 0.3s ease;
    min-width: 300px;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(100px); }
    to { opacity: 1; 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 i {
    font-size: 1.25rem;
}

.toast.success i { color: var(--success); }
.toast.error i { color: var(--danger); }
.toast.info i { color: var(--primary); }

.toast-message {
    flex: 1;
}

.toast-close {
    background: none;
    border: none;
    color: var(--text-muted);
    cursor: pointer;
    padding: 0.25rem;
}

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

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1.5rem;
    max-width: 400px;
    width: 90%;
    border: 1px solid var(--border-color);
}

.modal-header h3 {
    margin-bottom: 1rem;
}

.modal-body {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.modal-footer {
    display: flex;
    gap: 0.75rem;
    justify-content: flex-end;
}

/* ============================================
   Loading Overlay
   ============================================ */

.loading-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1001;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    gap: 1rem;
}

.loading-overlay.active {
    display: flex;
}

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

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

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

@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
        transition: transform 0.3s ease;
    }

    .sidebar.open {
        transform: translateX(0);
    }

    .main-content {
        margin-left: 0;
        padding: 1rem;
    }

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

    .verify-vs {
        margin: 0 auto;
    }

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