/* ============================================
   BASE STYLES
   Global reset, typography, and utilities
   ============================================ */

/* CSS Variables - Color Palette */
:root {
    /* Primary Colors */
    --primary: #cf2e3e;
    --primary-dark: #b02836;
    --primary-light: #d94a58;
    --primary-color: #cf2e3e;
    --primary-color-light: #fce8ea;
    
    /* Accent Colors */
    --accent: #06b6d4;
    --accent-dark: #0891b2;
    
    /* Neutral Colors */
    --gray-50: #f9fafb;
    --gray-100: #f3f4f6;
    --gray-200: #e5e7eb;
    --gray-300: #d1d5db;
    --gray-400: #9ca3af;
    --gray-500: #6b7280;
    --gray-600: #4b5563;
    --gray-700: #374151;
    --gray-800: #1f2937;
    --gray-900: #111827;
    
    /* Status Colors */
    --success: #10b981;
    --success-light: #d1fae5;
    --warning: #f59e0b;
    --warning-light: #fef3c7;
    --danger: #cf2e3e;
    --danger-light: #fce8ea;
    --error-color: #cf2e3e;
    --info: #3b82f6;
    --info-light: #dbeafe;
    
    /* Spacing */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 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);
    
    /* Transitions */
    --transition-fast: 150ms ease;
    --transition-normal: 300ms ease;
    
    /* Z-Index */
    --z-dropdown: 100;
    --z-header: 200;
    --z-modal: 300;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--gray-800);
    background-color: var(--gray-50);
    min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: 1.25;
    color: var(--gray-900);
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1.125rem; }
h5 { font-size: 1rem; }
h6 { font-size: 0.875rem; }

p {
    margin-bottom: var(--spacing-md);
}

a {
    color: var(--primary);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-dark);
}

/* App Layout - Sidebar Style */
.app-wrapper {
    display: flex;
    min-height: 100vh;
}

.main-wrapper {
    flex: 1;
    margin-left: 260px;
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

.main-content {
    flex: 1;
    padding: var(--spacing-xl) 0;
}

.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* ============================================
   DESKTOP SIDEBAR
   ============================================ */
.sidebar {
    position: fixed;
    top: 0;
    left: 0;
    width: 260px;
    height: 100vh;
    background: white;
    border-right: 1px solid var(--gray-200);
    display: flex;
    flex-direction: column;
    z-index: var(--z-header);
    overflow-y: auto;
}

.sidebar-header {
    padding: var(--spacing-lg);
    border-bottom: 1px solid var(--gray-200);
}

.sidebar-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
}

.sidebar-logo:hover {
    color: var(--gray-900);
}

.sidebar-logo-image {
    width: 36px;
    height: 36px;
    object-fit: contain;
}

.sidebar-logo-text {
    white-space: nowrap;
}

.sidebar-nav {
    flex: 1;
    padding: var(--spacing-md) 0;
    overflow-y: auto;
}

.sidebar-category {
    margin-bottom: var(--spacing-md);
}

.sidebar-category-label {
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.7rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--gray-400);
    margin-bottom: var(--spacing-xs);
}

.sidebar-nav-list {
    list-style: none;
    margin: 0;
    padding: 0;
}

.sidebar-nav-item {
    margin: 0;
}

.sidebar-nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--gray-600);
    font-size: 0.9rem;
    font-weight: 500;
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
}

.sidebar-nav-link i {
    width: 20px;
    text-align: center;
    font-size: 0.9rem;
}

.sidebar-nav-link:hover {
    color: var(--primary);
    background-color: var(--gray-50);
}

.sidebar-nav-link.active {
    color: var(--primary);
    background-color: var(--primary-color-light);
    border-left-color: var(--primary);
}

/* Sidebar Footer & User Menu */
.sidebar-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
    margin-top: auto;
}

.sidebar-user {
    position: relative;
}

.sidebar-user-toggle {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--gray-50);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: background-color var(--transition-fast);
}

.sidebar-user-toggle:hover {
    background-color: var(--gray-100);
}

.sidebar-user-avatar,
.sidebar-user-avatar-placeholder {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
    flex-shrink: 0;
}

.sidebar-user-avatar-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
}

.sidebar-user-info {
    flex: 1;
    text-align: left;
    overflow: hidden;
}

.sidebar-user-name {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--gray-800);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-user-type {
    display: block;
    font-size: 0.75rem;
    color: var(--gray-500);
}

.sidebar-user-arrow {
    font-size: 0.625rem;
    color: var(--gray-400);
    transition: transform var(--transition-fast);
}

.sidebar-user-toggle.open .sidebar-user-arrow {
    transform: rotate(180deg);
}

.sidebar-user-menu {
    position: absolute;
    bottom: 100%;
    left: 0;
    right: 0;
    margin-bottom: var(--spacing-sm);
    background: white;
    border: 1px solid var(--gray-200);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(10px);
    transition: all var(--transition-fast);
    z-index: var(--z-dropdown);
}

.sidebar-user-menu.open {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.sidebar-user-menu-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-md);
    color: var(--gray-700);
    font-size: 0.875rem;
    transition: background-color var(--transition-fast);
}

.sidebar-user-menu-item:hover {
    background-color: var(--gray-50);
}

.sidebar-user-menu-item-danger {
    color: var(--danger);
}

.sidebar-user-menu-item-danger:hover {
    background-color: var(--danger-light);
}

/* ============================================
   MOBILE HEADER & NAVIGATION
   ============================================ */
.mobile-header {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 60px;
    background: white;
    border-bottom: 1px solid var(--gray-200);
    padding: 0 var(--spacing-md);
    align-items: center;
    justify-content: space-between;
    z-index: var(--z-header);
}

.mobile-menu-toggle {
    padding: var(--spacing-sm);
    background: none;
    border: none;
    cursor: pointer;
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background-color: var(--gray-700);
    position: relative;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background-color: var(--gray-700);
    left: 0;
}

.hamburger::before { top: -8px; }
.hamburger::after { top: 8px; }

.mobile-nav-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: calc(var(--z-header) + 10);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-fast);
}

.mobile-nav-overlay.open {
    opacity: 1;
    visibility: visible;
}

.mobile-nav {
    position: absolute;
    top: 0;
    left: 0;
    width: 280px;
    height: 100%;
    background: white;
    transform: translateX(-100%);
    transition: transform var(--transition-normal);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.mobile-nav-overlay.open .mobile-nav {
    transform: translateX(0);
}

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

.mobile-nav-close {
    padding: var(--spacing-sm);
    background: none;
    border: none;
    font-size: 1.25rem;
    color: var(--gray-500);
    cursor: pointer;
}

.mobile-nav-user {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md);
    background: var(--gray-50);
    border-bottom: 1px solid var(--gray-200);
}

.mobile-nav-user-info {
    display: flex;
    flex-direction: column;
}

.mobile-nav-list {
    list-style: none;
    padding: var(--spacing-md) 0;
    flex: 1;
}

.mobile-nav-item {
    margin: 0;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    color: var(--gray-700);
    font-size: 0.9375rem;
    transition: all var(--transition-fast);
}

.mobile-nav-link i {
    width: 24px;
    text-align: center;
}

.mobile-nav-link:hover,
.mobile-nav-link.active {
    background-color: var(--primary-color-light);
    color: var(--primary);
}

.mobile-nav-footer {
    padding: var(--spacing-md);
    border-top: 1px solid var(--gray-200);
    margin-top: auto;
}

.mobile-nav-link-danger {
    color: var(--danger);
}

.mobile-nav-link-danger:hover {
    background-color: var(--danger-light);
    color: var(--danger);
}

/* Logo (shared styles) */
.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--gray-900);
}

.logo:hover {
    color: var(--gray-900);
}

.logo-image {
    width: 32px;
    height: 32px;
    object-fit: contain;
}

/* User avatars (shared) */
.user-avatar, .user-avatar-placeholder {
    width: 36px;
    height: 36px;
    border-radius: var(--radius-full);
    object-fit: cover;
}

.user-avatar-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
}

/* Footer */
.main-footer {
    background: white;
    border-top: 1px solid var(--gray-200);
    padding: var(--spacing-lg) 0;
    text-align: center;
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-sm) var(--spacing-lg);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
}

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

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

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

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

.btn-secondary:hover {
    background-color: var(--gray-300);
    color: var(--gray-800);
}

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

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

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

.btn-warning:hover {
    background-color: #d97706;
    color: white;
}

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

.btn-danger:hover {
    background-color: #b02836;
    color: white;
}

.btn-sm {
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
}

.btn-lg {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1rem;
}

.btn-block {
    width: 100%;
}

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

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

.form-control {
    width: 100%;
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 1rem;
    border: 1px solid var(--gray-300);
    border-radius: var(--radius-md);
    background-color: white;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1);
}

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

textarea.form-control {
    resize: vertical;
    min-height: 100px;
}

select.form-control {
    cursor: pointer;
}

.form-help {
    display: block;
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--gray-500);
}

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-lg);
}

.form-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.form-actions {
    display: flex;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--gray-200);
}

/* Alerts */
.alert {
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-md);
}

.alert ul {
    margin: 0;
    padding-left: var(--spacing-lg);
}

.alert-success {
    background-color: var(--success-light);
    color: #065f46;
    border: 1px solid #a7f3d0;
}

.alert-error {
    background-color: var(--danger-light);
    color: #a82532;
    border: 1px solid #f5c4c8;
}

.alert-warning {
    background-color: var(--warning-light);
    color: #92400e;
    border: 1px solid #fde68a;
}

.alert-info {
    background-color: var(--info-light);
    color: #1e40af;
    border: 1px solid #93c5fd;
}

.alert-close {
    background: none;
    border: none;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0.5;
    transition: opacity var(--transition-fast);
}

.alert-close:hover {
    opacity: 1;
}

/* Badges */
.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-full);
}

.badge-client {
    background-color: var(--info-light);
    color: var(--info);
}

.badge-staff {
    background-color: var(--warning-light);
    color: #b45309;
}

.badge-owner {
    background-color: var(--primary-color-light);
    color: var(--primary);
}

.badge-public {
    background-color: var(--success-light);
    color: #047857;
}

.badge-private {
    background-color: var(--gray-200);
    color: var(--gray-700);
}

.badge-assigned {
    background-color: var(--info-light);
    color: var(--info);
}

.badge-completed {
    background-color: var(--success-light);
    color: #047857;
}

.badge-missed {
    background-color: var(--danger-light);
    color: #a82532;
}

.badge-excused {
    background-color: var(--warning-light);
    color: #b45309;
}

.badge-danger {
    background-color: var(--danger-light);
    color: #a82532;
}

/* Page Header */
.page-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: var(--spacing-xl);
}

.page-header h1 {
    margin-bottom: 0;
}

.page-header-content {
    display: flex;
    flex-direction: column;
}

.page-header-content h1 {
    margin-bottom: var(--spacing-xs);
}

/* Breadcrumb */
.breadcrumb {
    margin-bottom: var(--spacing-lg);
}

.breadcrumb a {
    color: var(--gray-500);
    font-size: 0.875rem;
}

.breadcrumb a:hover {
    color: var(--primary);
}

/* Text Utilities */
.text-muted { color: var(--gray-500); }
.text-success { color: var(--success); }
.text-danger { color: var(--danger); }
.text-warning { color: var(--warning); }
.text-center { text-align: center; }

/* Data Tables */
.data-table-wrapper {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    overflow: hidden;
}

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

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

.data-table th {
    background-color: var(--gray-50);
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--gray-600);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

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

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

.row-warning {
    background-color: var(--warning-light);
}

.row-warning:hover {
    background-color: #fef3c7 !important;
}

.table-actions {
    display: flex;
    gap: var(--spacing-xs);
    flex-wrap: wrap;
}

.inline-form {
    display: inline;
}

/* User/Workout Cell */
.user-cell, .workout-cell {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.user-avatar-sm, .user-avatar-sm-placeholder, .workout-thumb, .workout-thumb-placeholder {
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    object-fit: cover;
    flex-shrink: 0;
}

.user-avatar-sm-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--primary);
    color: white;
    font-size: 0.75rem;
    font-weight: 600;
}

.workout-thumb-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    background-color: var(--gray-200);
    font-size: 1rem;
}

/* Empty State */
.empty-state {
    text-align: center;
    padding: var(--spacing-2xl);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.empty-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
}

.empty-state h3 {
    color: var(--gray-700);
    margin-bottom: var(--spacing-sm);
}

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

/* Pagination */
.pagination {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--spacing-md);
    margin-top: var(--spacing-xl);
}

.pagination-info {
    color: var(--gray-500);
    font-size: 0.875rem;
}

/* Tags */
.tag {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    margin-right: var(--spacing-xs);
}

.tag-muscle {
    background-color: var(--info-light);
    color: var(--info);
}

.tag-category {
    background-color: var(--primary-color-light);
    color: var(--primary);
}

.tag-private {
    background-color: var(--gray-200);
    color: var(--gray-700);
}

.tag-sm {
    padding: 2px 6px;
    font-size: 0.625rem;
}

/* Media Queries */
@media (max-width: 992px) {
    /* Hide desktop sidebar */
    .sidebar {
        display: none;
    }
    
    /* Show mobile header */
    .mobile-header {
        display: flex;
    }
    
    /* Show mobile nav overlay */
    .mobile-nav-overlay {
        display: block;
    }
    
    /* Adjust main wrapper for mobile */
    .main-wrapper {
        margin-left: 0;
        padding-top: 60px;
    }
    
    .page-header {
        flex-direction: column;
        align-items: flex-start;
        gap: var(--spacing-md);
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .data-table-wrapper {
        overflow-x: auto;
    }
    
    .table-actions {
        flex-direction: column;
    }
}

/* Current media preview */
.current-media {
    margin-bottom: var(--spacing-lg);
}

.current-media label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--gray-700);
}

.current-image-preview,
.current-profile-preview {
    max-width: 200px;
    max-height: 200px;
    border-radius: var(--radius-md);
    object-fit: cover;
}

.current-video-preview {
    max-width: 400px;
    border-radius: var(--radius-md);
}

/* Horizontal rule styling */
hr {
    border: none;
    border-top: 1px solid var(--gray-200);
    margin: var(--spacing-xl) 0;
}

/* Media badge for tables */
.media-badge {
    font-size: 1rem;
    margin-right: var(--spacing-xs);
}