/* =====================================================================
   AutoAttendance Web UI - Ultra-Premium Professional SaaS Design
   ===================================================================== */

:root {
    /* Refined Color Palette - Professional SaaS */
    --primary: #2563EB; /* Clean, professional Royal Blue */
    --primary-light: #60A5FA;
    --primary-dark: #1D4ED8;
    --primary-bg: #EFF6FF;
    
    --secondary: #0F172A; /* Slate 900 for dark accents/buttons */
    --secondary-light: #334155;
    
    --success: #10B981; /* Emerald 500 */
    --success-bg: #ECFDF5;
    --warning: #F59E0B; /* Amber 500 */
    --warning-bg: #FFFBEB;
    --danger: #EF4444; /* Red 500 */
    --danger-bg: #FEF2F2;
    --info: #3B82F6; /* Blue 500 */
    --info-bg: #EFF6FF;

    /* Backgrounds - Crisp Light Theme */
    --bg-base: #F8FAFC; /* Slate 50 - Very soft off-white for the body */
    --bg-primary: #FFFFFF; /* Pure white for cards/sections */
    --bg-secondary: #F1F5F9; /* Slate 100 - subtle contrast */
    --bg-tertiary: #E2E8F0;

    /* Typography Colors */
    --text-heading: #0F172A; /* High contrast dark for headings */
    --text-primary: #334155; /* Slate 700 for main body */
    --text-secondary: #64748B; /* Slate 500 for subtitles */
    --text-muted: #94A3B8;

    /* Borders */
    --border-color: #E2E8F0; /* Clean, subtle border */
    --border-light: #F1F5F9;

    /* Premium Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(15, 23, 42, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 2px 4px -1px rgba(15, 23, 42, 0.03);
    --shadow-lg: 0 10px 15px -3px rgba(15, 23, 42, 0.05), 0 4px 6px -2px rgba(15, 23, 42, 0.02);
    --shadow-xl: 0 20px 25px -5px rgba(15, 23, 42, 0.05), 0 10px 10px -5px rgba(15, 23, 42, 0.02);
    
    /* Elegant Hover Shadow */
    --shadow-hover: 0 12px 24px -6px rgba(15, 23, 42, 0.08), 0 4px 8px -4px rgba(15, 23, 42, 0.04);

    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;

    /* Typography */
    --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    --font-size-xs: 0.75rem;
    --font-size-sm: 0.875rem;
    --font-size-base: 1rem;
    --font-size-lg: 1.125rem;
    --font-size-xl: 1.25rem;
    --font-size-2xl: 1.5rem;
    --font-size-3xl: 2rem;

    /* Radii */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;

    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* =====================================================================
   Reset and Base Styles
   ===================================================================== */

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    font-size: var(--font-size-base);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-base);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
    color: var(--text-heading);
    font-weight: 600;
    letter-spacing: -0.02em;
    line-height: 1.2;
}

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

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

/* Sleek Sidebar */
.sidebar {
    width: 280px;
    background: var(--bg-primary);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    z-index: 100;
}

.sidebar-header {
    padding: var(--spacing-xl) var(--spacing-xl) var(--spacing-lg);
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--text-heading);
    letter-spacing: -0.03em;
}

.logo-icon {
    font-size: 1.75rem;
    background: var(--primary);
    color: white;
    width: 36px;
    height: 36px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-md);
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.2);
}

.logo-text {
    display: flex;
    flex-direction: column;
}

.sidebar-nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 0 var(--spacing-lg);
    gap: 0.25rem;
}

.nav-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 0.75rem 1rem;
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    font-weight: 500;
    font-size: var(--font-size-sm);
}

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

.nav-item.active {
    background-color: var(--primary-bg);
    color: var(--primary-dark);
    font-weight: 600;
}

.nav-icon {
    font-size: 1.2rem;
    width: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.8;
}

.nav-item.active .nav-icon {
    opacity: 1;
}

.nav-label {
    flex: 1;
}

.sidebar-footer {
    padding: var(--spacing-lg) var(--spacing-xl);
}

.system-status {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 0.75rem;
    background: var(--bg-base);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
}

.status-indicator {
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background-color: var(--text-muted);
}

.status-indicator.active {
    background-color: var(--success);
    box-shadow: 0 0 0 4px var(--success-bg);
}

.status-text {
    flex: 1;
}

.status-label {
    font-size: 0.65rem;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

.status-value {
    font-size: var(--font-size-xs);
    font-weight: 600;
    color: var(--text-heading);
}

/* Main Content */
.main-content {
    flex: 1;
    margin-left: 280px;
    display: flex;
    flex-direction: column;
}

.top-bar {
    background: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    padding: var(--spacing-lg) var(--spacing-2xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
    position: sticky;
    top: 0;
    z-index: 90;
}

.top-bar-left h1 {
    font-size: var(--font-size-2xl);
}

.top-bar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-xl);
}

.search-box {
    position: relative;
}

.search-input {
    padding: 0.5rem 1rem 0.5rem 2.5rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-secondary);
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    transition: all var(--transition-fast);
    width: 240px;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2364748B'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M21 21l-6-6m2-5a7 7 0 11-14 0 7 7 0 0114 0z'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: 0.75rem center;
    background-size: 1rem;
}

.search-input:focus {
    outline: none;
    border-color: var(--primary);
    background-color: var(--bg-primary);
    box-shadow: 0 0 0 3px var(--primary-bg);
    width: 280px;
}

.user-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: 0.375rem 1rem 0.375rem 0.375rem;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 2rem;
    cursor: pointer;
    transition: all var(--transition-fast);
    color: var(--text-heading);
}

.user-button:hover {
    background: var(--bg-secondary);
}

.user-avatar {
    width: 32px;
    height: 32px;
    background: var(--bg-tertiary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.user-label {
    font-size: var(--font-size-sm);
    font-weight: 500;
}

.page-content {
    flex: 1;
    padding: var(--spacing-2xl);
    max-width: 1400px;
    margin: 0 auto;
    width: 100%;
}

/* =====================================================================
   Cards and Sections
   ===================================================================== */

.section {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
}

.section-header h2 {
    font-size: var(--font-size-lg);
    color: var(--text-heading);
}

.section-description {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    margin-top: -0.5rem;
    margin-bottom: var(--spacing-lg);
}

/* =====================================================================
   Grid Layouts & Stat Cards
   ===================================================================== */

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.stat-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-smooth);
}

.stat-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
    border-color: var(--primary-light);
}

.stat-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.stat-icon {
    font-size: 1.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    color: var(--text-primary);
}

.stat-label {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
    font-weight: 500;
}

.stat-value {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--text-heading);
    letter-spacing: -0.03em;
    line-height: 1;
}

.stat-subtitle {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

/* Quick Actions */
.quick-actions h2 {
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-lg);
}

.actions-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-2xl);
}

.action-button {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: 1.25rem var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    background: var(--bg-primary);
    cursor: pointer;
    text-decoration: none;
    transition: all var(--transition-smooth);
    font-weight: 500;
    color: var(--text-heading);
    box-shadow: var(--shadow-sm);
}

.action-button:hover {
    border-color: var(--border-color);
    background: var(--bg-secondary);
    box-shadow: var(--shadow-md);
    transform: translateY(-1px);
}

.action-primary {
    border-color: var(--secondary);
    background: var(--secondary);
    color: white;
}

.action-primary:hover {
    background: var(--secondary-light);
    border-color: var(--secondary-light);
    color: white;
}

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

.action-text {
    font-size: var(--font-size-sm);
}

/* Persons Grid */
.persons-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.person-card {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-md);
    text-align: center;
    transition: all var(--transition-smooth);
}

.person-card:hover {
    box-shadow: var(--shadow-hover);
    border-color: var(--border-color);
    transform: translateY(-2px);
}

.person-avatar {
    font-size: 2.5rem;
    width: 80px;
    height: 80px;
    background: var(--bg-secondary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    border: 4px solid var(--bg-primary);
    box-shadow: 0 0 0 1px var(--border-color);
    margin-bottom: var(--spacing-xs);
}

.person-name {
    font-weight: 600;
    font-size: var(--font-size-base);
    color: var(--text-heading);
}

.person-detail {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    background: var(--bg-secondary);
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
}

/* =====================================================================
   Tables
   ===================================================================== */

.table-responsive {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    background: var(--bg-primary);
}

.data-table {
    width: 100%;
    border-collapse: collapse;
    font-size: var(--font-size-sm);
}

.data-table thead {
    background-color: var(--bg-base);
    border-bottom: 1px solid var(--border-color);
}

.data-table th {
    padding: 0.875rem var(--spacing-lg);
    text-align: left;
    font-weight: 500;
    color: var(--text-secondary);
    white-space: nowrap;
}

.data-table td {
    padding: 1rem var(--spacing-lg);
    border-bottom: 1px solid var(--border-light);
    color: var(--text-primary);
    vertical-align: middle;
}

.data-table tbody tr:last-child td {
    border-bottom: none;
}

.data-table tbody tr {
    transition: background-color var(--transition-fast);
}

.data-table tbody tr:hover {
    background-color: var(--bg-base);
}

/* =====================================================================
   Filters & Header Actions
   ===================================================================== */
.filter-bar, .header-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
    align-items: center;
}

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

.form-group {
    margin-bottom: var(--spacing-xl);
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    font-size: var(--font-size-sm);
    color: var(--text-heading);
}

.form-input,
.form-range,
.form-select {
    width: 100%;
    padding: 0.75rem 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-family: var(--font-family);
    background-color: var(--bg-primary);
    color: var(--text-heading);
    transition: all var(--transition-fast);
    box-shadow: var(--shadow-sm);
}

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

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

.form-hint {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    margin-top: 0.375rem;
}

/* Settings List */
.settings-group {
    display: flex;
    flex-direction: column;
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-lg) 0;
    border-bottom: 1px solid var(--border-color);
}

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

.setting-label {
    flex: 1;
    padding-right: var(--spacing-lg);
}

.setting-label label {
    font-weight: 500;
    color: var(--text-heading);
    display: block;
}

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

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: 0.625rem 1.25rem;
    border: 1px solid transparent;
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    font-weight: 500;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    box-shadow: var(--shadow-sm);
}

.btn:active {
    transform: translateY(1px);
}

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

.btn-primary:hover {
    background-color: var(--secondary-light);
    box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
    background-color: var(--bg-base);
    border-color: var(--text-muted);
}

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

.btn-success:hover {
    background-color: #059669;
}

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

.btn-danger:hover {
    background-color: #DC2626;
}

.button-group {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    flex-wrap: wrap;
}

.btn-icon {
    width: 32px;
    height: 32px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
}

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

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

/* =====================================================================
   Badges and Status
   ===================================================================== */

.badge {
    display: inline-flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
}

.badge-success {
    background-color: var(--success-bg);
    color: #047857;
    border: 1px solid rgba(16, 185, 129, 0.2);
}

.badge-warning {
    background-color: var(--warning-bg);
    color: #B45309;
    border: 1px solid rgba(245, 158, 11, 0.2);
}

.badge-danger {
    background-color: var(--danger-bg);
    color: #B91C1C;
    border: 1px solid rgba(239, 68, 68, 0.2);
}

.badge-info {
    background-color: var(--info-bg);
    color: #1D4ED8;
    border: 1px solid rgba(59, 130, 246, 0.2);
}

/* =====================================================================
   Step Indicator (Registration)
   ===================================================================== */
.step-indicator {
    display: flex;
    justify-content: space-between;
    margin-bottom: var(--spacing-2xl);
    position: relative;
    padding: 0 var(--spacing-lg);
}

.step-indicator::before {
    content: '';
    position: absolute;
    top: 16px;
    left: var(--spacing-xl);
    right: var(--spacing-xl);
    height: 2px;
    background: var(--border-color);
    z-index: 1;
}

.step {
    position: relative;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
    background: var(--bg-primary);
    padding: 0 var(--spacing-sm);
}

.step-number {
    width: 32px;
    height: 32px;
    border-radius: 50%;
    background: var(--bg-primary);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    transition: all var(--transition-base);
}

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

.step-title {
    font-size: var(--font-size-xs);
    font-weight: 500;
    color: var(--text-muted);
}

.step.active .step-title {
    color: var(--text-heading);
}

/* =====================================================================
   Alerts & Progress
   ===================================================================== */
.alert {
    display: flex;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    font-size: var(--font-size-sm);
    align-items: flex-start;
}

.alert-info {
    background: var(--info-bg);
    border: 1px solid rgba(59, 130, 246, 0.2);
    color: #1E3A8A;
}

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

.progress-bar {
    width: 100%;
    height: 6px;
    background: var(--bg-secondary);
    border-radius: 3px;
    overflow: hidden;
    margin: var(--spacing-lg) 0 var(--spacing-sm) 0;
}

.progress-fill {
    height: 100%;
    background: var(--primary);
    width: 0%;
    animation: progressAnim 15s ease-in-out forwards;
    border-radius: 3px;
}

@keyframes progressAnim {
    0% { width: 0%; }
    50% { width: 60%; }
    100% { width: 100%; }
}

.progress-text {
    font-size: var(--font-size-xs);
    color: var(--text-secondary);
    text-align: center;
}

/* =====================================================================
   Camera Feed
   ===================================================================== */
#cameraFeed {
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color) !important;
    box-shadow: var(--shadow-sm);
    background: var(--bg-secondary);
}

/* =====================================================================
   Toasts & Utils
   ===================================================================== */
.toast-container {
    position: fixed;
    bottom: var(--spacing-xl);
    right: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    z-index: 1000;
}

.toast {
    background: var(--text-heading);
    color: white;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--font-size-sm);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: slideIn 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
}

@keyframes slideIn {
    from { transform: translateY(100%); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.link-text {
    color: var(--primary);
    text-decoration: none;
    font-weight: 500;
    font-size: var(--font-size-sm);
}

.link-text:hover {
    text-decoration: underline;
}

/* System Info Grid */
.info-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.info-item {
    background: var(--bg-secondary);
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.info-label {
    color: var(--text-secondary);
    font-size: var(--font-size-sm);
    font-weight: 500;
}

/* =====================================================================
   Premium Form Controls (Toggles & Sliders)
   ===================================================================== */

/* Toggle Switch */
.toggle-switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

.toggle-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.toggle-slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-tertiary);
    transition: .3s;
    border-radius: 24px;
    box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

.toggle-slider:before {
    position: absolute;
    content: "";
    height: 20px;
    width: 20px;
    left: 2px;
    bottom: 2px;
    background-color: white;
    transition: .3s;
    border-radius: 50%;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

input:checked + .toggle-slider {
    background-color: var(--success);
}

input:focus + .toggle-slider {
    box-shadow: 0 0 1px var(--success);
}

input:checked + .toggle-slider:before {
    transform: translateX(20px);
}

/* Custom Range Slider */
.form-range {
    -webkit-appearance: none;
    width: 100%;
    background: transparent;
    padding: 0;
    border: none;
    box-shadow: none;
}

.form-range::-webkit-slider-thumb {
    -webkit-appearance: none;
    height: 20px;
    width: 20px;
    border-radius: 50%;
    background: white;
    cursor: pointer;
    margin-top: -8px;
    box-shadow: 0 2px 5px rgba(0,0,0,0.2);
    border: 1px solid var(--border-color);
}

.form-range::-webkit-slider-runnable-track {
    width: 100%;
    height: 6px;
    cursor: pointer;
    background: var(--bg-tertiary);
    border-radius: 3px;
}

.form-range:focus {
    outline: none;
}

.range-value-display {
    display: inline-block;
    width: 48px;
    text-align: center;
    background: var(--bg-secondary);
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--text-heading);
    border: 1px solid var(--border-color);
}

/* Settings Page Layout */
.settings-section {
    display: grid;
    grid-template-columns: 1fr 2.5fr;
    gap: var(--spacing-2xl);
    padding: var(--spacing-xl) 0;
    border-bottom: 1px solid var(--border-color);
}

.settings-section:last-child {
    border-bottom: none;
}

.settings-sidebar h3 {
    font-size: var(--font-size-lg);
    color: var(--text-heading);
    margin-bottom: var(--spacing-xs);
}

.settings-sidebar p {
    font-size: var(--font-size-sm);
    color: var(--text-secondary);
}

.settings-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
}

.setting-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    border-bottom: 1px solid var(--border-light);
}

.setting-item:first-child {
    padding-top: 0;
}

.setting-item:last-child {
    padding-bottom: 0;
    border-bottom: none;
}

.setting-label {
    flex: 1;
    padding-right: var(--spacing-xl);
}

.setting-label label {
    font-weight: 600;
    color: var(--text-heading);
    display: block;
    font-size: var(--font-size-sm);
}

.setting-control {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    min-width: 280px;
    justify-content: flex-end;
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 6px;
    height: 6px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: #CBD5E1;
    border-radius: 3px;
}

::-webkit-scrollbar-thumb:hover {
    background: #94A3B8;
}

/* =====================================================================
   Responsive Design & Media Queries
   ===================================================================== */

/* Desktop & Large Devices */
@media (max-width: 1200px) {
    .page-content {
        padding: var(--spacing-xl);
    }
}

/* Tablets & Smaller Laptops */
@media (max-width: 992px) {
    .settings-section {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .setting-control {
        justify-content: flex-start;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

/* Mobile & Small Tablets */
@media (max-width: 768px) {
    .app-container {
        flex-direction: column;
    }

    /* Sidebar transforms into a sliding mobile menu */
    .sidebar {
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        box-shadow: var(--shadow-xl);
    }
    
    .sidebar.open {
        transform: translateX(0);
    }
    
    .sidebar-overlay {
        display: none;
        position: fixed;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: rgba(15, 23, 42, 0.5);
        backdrop-filter: blur(4px);
        z-index: 95;
        opacity: 0;
        transition: opacity var(--transition-base);
    }

    .sidebar-overlay.active {
        display: block;
        opacity: 1;
    }

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

    /* Top bar adjustments */
    .top-bar {
        padding: var(--spacing-md) var(--spacing-lg);
    }

    .top-bar-left {
        display: flex;
        align-items: center;
        gap: var(--spacing-md);
    }

    .mobile-menu-btn {
        display: flex;
        align-items: center;
        justify-content: center;
        background: transparent;
        border: none;
        color: var(--text-heading);
        cursor: pointer;
        padding: var(--spacing-xs);
        border-radius: var(--radius-sm);
        transition: background var(--transition-fast);
    }

    .mobile-menu-btn:hover {
        background: var(--bg-secondary);
    }

    .top-bar-left h1 {
        font-size: var(--font-size-xl);
    }

    .search-input {
        width: 180px;
    }
    
    .search-input:focus {
        width: 200px;
    }

    /* Content adjustments */
    .page-content {
        padding: var(--spacing-md);
    }

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

    .persons-grid {
        grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    }

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

/* Hide mobile menu button on desktop */
@media (min-width: 769px) {
    .mobile-menu-btn {
        display: none !important;
    }
    .sidebar-overlay {
        display: none !important;
    }
}

/* Small Mobile Devices */
@media (max-width: 480px) {
    .top-bar-right {
        gap: var(--spacing-sm);
    }

    .user-label {
        display: none;
    }

    .search-input {
        width: 140px;
    }
    
    .search-input:focus {
        width: 160px;
    }

    .action-button {
        padding: 1rem var(--spacing-md);
    }

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

    .dynamic-steps {
        flex-direction: column;
        align-items: center;
        gap: var(--spacing-lg);
        padding: 0;
    }

    .dynamic-steps::before {
        display: none;
    }

    .glass-panel {
        padding: var(--spacing-lg);
    }

    .camera-hud {
        flex-direction: column;
        gap: var(--spacing-sm);
        bottom: 10px;
        left: 10px;
        right: 10px;
    }

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