/* ============================================
   GYM MANAGEMENT SYSTEM - MODERN STYLESHEET
   ============================================ */

/* Import Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700&display=swap');

/* ============================================
   CSS VARIABLES & DESIGN TOKENS
   ============================================ */
:root {
    /* Colors */
    --primary: #667eea;
    --primary-dark: #5568d3;
    --secondary: #764ba2;
    --accent: #f093fb;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #3b82f6;
    
    /* Gradients */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-success: linear-gradient(135deg, #10b981 0%, #059669 100%);
    --gradient-danger: linear-gradient(135deg, #ef4444 0%, #dc2626 100%);
    --gradient-warning: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
    
    /* Neutrals */
    --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;
    
    /* 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: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    
    /* 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);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    
    /* Transitions */
    --transition-fast: 150ms ease-in-out;
    --transition-base: 300ms ease-in-out;
    --transition-slow: 500ms ease-in-out;
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1; 
}

::-webkit-scrollbar-thumb {
    background: #1e3a8a; /* Dark Blue */
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: #1e40af; /* Lighter Dark Blue */
}

/* Firefox */
* {
    scrollbar-width: thin;
    scrollbar-color: #1e3a8a #f1f1f1;
}

body {
    font-family: 'Outfit', 'Inter', system-ui, -apple-system, sans-serif;
    font-size: 14px;
    line-height: 1.6;
    color: var(--gray-800);
    background: var(--gray-50);
    overflow-x: hidden;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: var(--spacing-md);
    color: var(--gray-900);
}

h1 { font-size: 2.5rem; }
h2 { font-size: 2rem; }
h3 { font-size: 1.75rem; }
h4 { font-size: 1.5rem; }
h5 { font-size: 1.25rem; }
h6 { font-size: 1rem; }

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

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

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

/* ============================================
   LAYOUT
   ============================================ */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

.container-fluid {
    width: 100%;
    padding: 0 var(--spacing-lg);
}

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

.sidebar {
    width: 280px;
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.95) 0%, rgba(30, 58, 138, 0.95) 100%),
                url('/gym/assets/images/gym_sidebar_silhouette.png') center/cover;
    background-blend-mode: overlay;
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
    box-shadow: var(--shadow-xl);
    z-index: 1000;
    transition: transform var(--transition-base), width var(--transition-base);
    backdrop-filter: blur(10px);
}

/* Mobile Sidebar & Overlay */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.show {
        transform: translateX(0);
    }
    
    .sidebar-overlay {
        position: fixed;
        top: 0;
        left: 0;
        width: 100%;
        height: 100%;
        background: rgba(0, 0, 0, 0.5);
        z-index: 999;
        display: none;
        backdrop-filter: blur(4px);
    }

    .sidebar-overlay.show {
        display: block;
    }

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

    .topbar .btn { 
        display: block !important; /* Force show toggle button */
    }

    .topbar {
        width: 100%;
    }
}

.sidebar-header {
    padding: var(--spacing-xl);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

/* Minimized Sidebar Styles */
.sidebar.minimized {
    width: 80px !important;
}

.sidebar.minimized .sidebar-header {
    justify-content: center;
    padding: var(--spacing-md);
}

.sidebar.minimized .sidebar-logo {
    display: flex;
    justify-content: center;
}

.sidebar.minimized .menu-link span {
    opacity: 0;
    width: 0;
    overflow: hidden;
    white-space: nowrap;
}

.sidebar.minimized .sidebar-logo-img {
    max-height: 40px !important;
}

.sidebar.minimized .menu-link {
    justify-content: center;
    padding-left: 0;
    padding-right: 0;
}

.sidebar.minimized .menu-link i.fa-chevron-down {
    display: none;
}

.sidebar.minimized .submenu {
    display: none !important;
}

/* Adjust main content when sidebar is minimized */
.sidebar.minimized ~ .main-content {
    margin-left: 80px !important;
}

.sidebar.minimized ~ .main-content .topbar {
    width: calc(100% - 80px) !important;
}

.sidebar-logo {
    font-size: 1.5rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.sidebar-logo i {
    font-size: 2rem;
}

.sidebar-menu {
    padding: var(--spacing-lg) 0;
}

.menu-item {
    margin-bottom: var(--spacing-xs);
}

.menu-link {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md) var(--spacing-xl);
    color: rgba(255, 255, 255, 0.9);
    transition: all var(--transition-fast);
    border-left: 3px solid transparent;
    font-size: 16px;
}

.menu-link:hover {
    background: rgba(255, 255, 255, 0.2);
    border-left-color: white;
    color: white;
    backdrop-filter: blur(5px);
}

.menu-link.active {
    background: rgba(255, 255, 255, 0.25);
    border-left-color: white;
    color: white;
    font-weight: 600;
    backdrop-filter: blur(5px);
}

.menu-link i {
    width: 20px;
    text-align: center;
}

.menu-link i.fa-chevron-down {
    transition: transform 0.3s ease;
}

.menu-link i.fa-chevron-down.rotate {
    transform: rotate(-180deg);
}

.submenu {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    background: rgba(0, 0, 0, 0.2);
    padding: 0;
    backdrop-filter: blur(5px);
    transition: max-height 0.4s ease-out, opacity 0.4s ease-out, padding 0.4s ease;
}

.submenu.show {
    display: block; /* Keep display block but rely on max-height */
    max-height: 1500px; /* Increased to accommodate large menus */
    opacity: 1;
    padding: var(--spacing-sm) 0;
}

.submenu .menu-link {
    padding-left: calc(var(--spacing-xl) + 40px);
    font-size: 0.9rem;
}

.main-content {
    flex: 1;
    margin-left: 280px;
    background: var(--gray-50);
    min-height: 100vh;
    transition: margin-left var(--transition-base);
}

.topbar {
    background: white;
    padding: var(--spacing-lg) var(--spacing-xl);
    padding-left: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: fixed;
    top: 0;
    right: 0;
    width: calc(100% - 280px);
    z-index: 100;
    transition: width var(--transition-base);
}

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

.topbar-left h1 {
    margin: 0;
    font-size: 1.75rem;
}

.topbar-right {
    display: flex;
    align-items: center;
    gap: var(--spacing-lg);
}

.user-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.user-avatar {
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: var(--gradient-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-weight: 600;
}

.content-area {
    padding: var(--spacing-xl);
    margin-top: 80px; /* Compensation for fixed header */
}

/* ============================================
   CARDS
   ============================================ */
.card {
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

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

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--gray-100);
}

.card-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.card-body {
    padding: 0;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.stat-card {
    background: white;
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    position: relative;
    overflow: hidden;
    transition: all var(--transition-base);
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

.stat-card.success::before {
    background: var(--gradient-success);
}

.stat-card.danger::before {
    background: var(--gradient-danger);
}

.stat-card.warning::before {
    background: var(--gradient-warning);
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.75rem;
    margin-bottom: var(--spacing-md);
    background: var(--gradient-primary);
    color: white;
}

.stat-card.success .stat-icon {
    background: var(--gradient-success);
}

.stat-card.danger .stat-icon {
    background: var(--gradient-danger);
}

.stat-card.warning .stat-icon {
    background: var(--gradient-warning);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray-500);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: var(--spacing-xs);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--gray-900);
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

.btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn:active {
    transform: translateY(0);
}

.btn-primary {
    background: #000000; /* Black */
    color: white;
}

.btn-primary:hover {
    background: #333333; /* Dark Gray */
}

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

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

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

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

.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: 0.875rem;
}

.btn-lg {
    padding: var(--spacing-lg) var(--spacing-xl);
    font-size: 1.125rem;
}

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

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--gray-700);
}

.form-control {
    width: 100%;
    padding: var(--spacing-md);
    border: 2px solid var(--gray-200);
    border-radius: var(--radius-md);
    font-size: 1rem;
    transition: all var(--transition-fast);
    background: white;
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(102, 126, 234, 0.1);
}

.form-control:disabled {
    background: var(--gray-100);
    cursor: not-allowed;
}

select.form-control {
    cursor: pointer;
}

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

.form-row {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
}

/* ============================================
   TABLES
   ============================================ */
.table-responsive {
    overflow-x: auto;
    overflow-y: visible;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    -webkit-overflow-scrolling: touch;
    width: 100%;
    display: block;
}

.table-responsive::-webkit-scrollbar {
    height: 8px;
}

.table-responsive::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 10px;
}

.table-responsive::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 10px;
}

.table-responsive::-webkit-scrollbar-thumb:hover {
    background: #555;
}

table {
    width: 100%;
    border-collapse: collapse;
    background: white;
    table-layout: auto;
}

thead {
    background: #0d1b3e; /* Darker Deep Blue */
    color: white;
}

thead th {
    padding: var(--spacing-lg);
    text-align: left;
    font-weight: 600;
    text-transform: uppercase;
    font-size: 0.875rem;
    letter-spacing: 0.5px;
}

tbody tr {
    border-bottom: 1px solid var(--gray-200);
    transition: background var(--transition-fast);
}

tbody tr:hover {
    background: var(--gray-50);
}

tbody tr[onclick] {
    cursor: pointer;
    transition: all var(--transition-fast);
}

tbody tr[onclick]:hover {
    background: linear-gradient(90deg, rgba(102, 126, 234, 0.05) 0%, rgba(118, 75, 162, 0.05) 100%);
    transform: scale(1.01);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

tbody td {
    padding: var(--spacing-lg);
}

thead th {
    padding: var(--spacing-lg);
}

/* ============================================
   BADGES
   ============================================ */
.badge {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

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

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

/* ============================================
   ALERTS
   ============================================ */
.alert {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    animation: slideIn 0.3s ease-out;
}

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

.alert-success {
    background: rgba(16, 185, 129, 0.1);
    border-left: 4px solid var(--success);
    color: var(--success);
}

.alert-danger {
    background: rgba(239, 68, 68, 0.1);
    border-left: 4px solid var(--danger);
    color: var(--danger);
}

.alert-warning {
    background: rgba(245, 158, 11, 0.1);
    border-left: 4px solid var(--warning);
    color: var(--warning);
}

.alert-info {
    background: rgba(59, 130, 246, 0.1);
    border-left: 4px solid var(--info);
    color: var(--info);
}

/* ============================================
   MODALS
   ============================================ */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.5);
    backdrop-filter: blur(5px);
    z-index: 2000;
    align-items: center;
    justify-content: center;
}

.modal.show {
    display: flex !important;
    animation: fadeIn 0.3s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background: white;
    border-radius: var(--radius-xl);
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: var(--shadow-xl);
    animation: slideUp 0.3s ease-out;
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.modal-header {
    padding: var(--spacing-xl);
    border-bottom: 2px solid var(--gray-100);
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    background: white;
    z-index: 10;
    border-radius: var(--radius-xl) var(--radius-xl) 0 0;
}

.modal-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.modal-close {
    background: none;
    border: none;
    font-size: 1.5rem;
    cursor: pointer;
    color: var(--gray-400);
    transition: color var(--transition-fast);
}

.modal-close:hover {
    color: var(--gray-700);
}

.modal-body {
    padding: var(--spacing-xl);
    overflow-y: auto;
    flex: 1;
    min-height: 0;
    max-height: calc(90vh - 140px);
}

.modal-footer {
    padding: var(--spacing-xl);
    border-top: 2px solid var(--gray-100);
    display: flex;
    justify-content: flex-end;
    gap: var(--spacing-md);
    position: sticky;
    bottom: 0;
    background: white;
    z-index: 10;
    border-radius: 0 0 var(--radius-xl) var(--radius-xl);
    flex-shrink: 0;
}

/* ============================================
   UTILITIES
   ============================================ */
.text-center { text-align: center; }
.text-right { text-align: right; }
.text-left { text-align: left; }

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }
.mt-4 { margin-top: var(--spacing-xl); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }
.mb-4 { margin-bottom: var(--spacing-xl); }

.d-flex { display: flex; }
.justify-between { justify-content: space-between; }
.align-center { align-items: center; }
.gap-1 { gap: var(--spacing-sm); }
.gap-2 { gap: var(--spacing-md); }
.gap-3 { gap: var(--spacing-lg); }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 768px) {
    .sidebar {
        transform: translateX(-100%);
    }
    
    .sidebar.show {
        transform: translateX(0);
    }
    
    .main-content {
        margin-left: 0;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .form-row {
        grid-template-columns: 1fr;
    }
    
    .topbar {
        padding: var(--spacing-md);
    }
    
    .content-area {
        padding: var(--spacing-md);
    }
}

/* ============================================
   LOGIN PAGE SPECIFIC
   ============================================ */
.login-wrapper {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    position: relative;
    overflow: hidden;
}

.login-wrapper::before {
    content: '';
    position: absolute;
    width: 500px;
    height: 500px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    top: -250px;
    right: -250px;
}

.login-wrapper::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    bottom: -150px;
    left: -150px;
}

.login-box {
    background: white;
    border-radius: var(--radius-2xl);
    padding: var(--spacing-2xl);
    box-shadow: var(--shadow-xl);
    width: 100%;
    max-width: 450px;
    position: relative;
    z-index: 1;
    animation: slideUp 0.5s ease-out;
}

.login-logo {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.login-logo i {
    font-size: 4rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.login-logo h1 {
    margin-top: var(--spacing-md);
    font-size: 2rem;
}

.login-logo p {
    color: var(--gray-500);
    margin: 0;
}

/* ============================================
   USER USER DROPDOWN
   ============================================ */
.user-dropdown-container {
    position: relative;
}

.user-dropdown-menu {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    width: 220px;
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    padding: var(--spacing-sm);
    display: none;
    flex-direction: column;
    z-index: 1000;
    animation: slideUpFade 0.2s ease-out;
    border: 1px solid var(--gray-100);
}

.user-dropdown-menu.show {
    display: flex;
}

.user-dropdown-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    padding: var(--spacing-md);
    color: var(--gray-700);
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
    font-weight: 500;
}

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

.user-dropdown-item.text-danger:hover {
    background: rgba(239, 68, 68, 0.1);
    color: var(--danger);
}

.user-dropdown-divider {
    height: 1px;
    background: var(--gray-100);
    margin: var(--spacing-xs) 0;
}

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