/**
 * Gym Management System - Premium UI Styles
 * Modern, clean, and responsive design
 */

/* CSS Reset & Variables */
:root {
    /* Vibrant Fitness Color Palette */
    --primary: #ff6b35;
    --primary-dark: #e85a2a;
    --primary-light: #ff8456;
    --secondary: #004e89;
    --secondary-dark: #003a66;
    --accent: #1a7fa0;
    --accent-bright: #00d9ff;
    
    /* Neutrals */
    --dark: #1a1a2e;
    --dark-light: #16213e;
    --gray: #4a5568;
    --gray-light: #cbd5e1;
    --gray-lighter: #f7fafc;
    --white: #ffffff;
    
    /* Gradient Colors */
    --gradient-primary: linear-gradient(135deg, #ff6b35 0%, #f7931e 100%);
    --gradient-secondary: linear-gradient(135deg, #004e89 0%, #1a7fa0 100%);
    --gradient-accent: linear-gradient(135deg, #00d9ff 0%, #1a7fa0 100%);
    --gradient-dark: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
    
    /* Status Colors */
    --success: #06d6a0;
    --error: #ef476f;
    --warning: #ffd166;
    --info: #118ab2;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    
    /* Border Radius */
    --radius-sm: 0.5rem;
    --radius-md: 0.75rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    
    /* Shadows - Enhanced */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
    --shadow-colored: 0 8px 24px rgba(255, 107, 53, 0.25);
    
    /* Typography */
    --font-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-primary);
    font-size: 16px;
    line-height: 1.6;
    color: var(--dark);
    background: var(--gray-lighter);
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}
    -moz-osx-font-smoothing: grayscale;
}

/* Container & Layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

.auth-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md);
    background: var(--gradient-dark);
    position: relative;
    overflow: hidden;
}- Enhanced with backdrop blur */
.card {
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(20px);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 480px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    position: relative;
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl) var(--radius-xl) 0 0al-gradient(circle, rgba(255, 107, 53, 0.15) 0%, transparent 70%);
    top: -200px;
    right: -200px;
    border-radius: 50%;
}

.auth-container::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, rgba(0, 217, 255, 0.1) 0%, transparent 70%);
    bottom: -100px;
    left: -100px;
    border-radius: 50%;
}

/* Cards */
.card {
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
    padding: var(--spacing-xl);
    width: 100%;
    max-width: 450px;
}

.card-header {
    text-align: center;
    margin-bottom: var(--spacing-lg);
}

.card-title {
    font-size: 1.875rem;
    font-weight: var(--font-weight-bold);
    color: var(--dark);
    margin-bottom: var(--spacing-xs);
}

.card-subtitle {
    font-size: 0.9375rem;
    color: var(--gray);
    font-weight: var(--font-weight-normal);
}

.card-body {
    margin-bottom: var(--spacing-md);
}

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

.form-label {
    display: block;
    font-size: 0.875rem;
    font-weight: var(--font-weight-medium);
    color: var(--dark);
    margin-bottom: var(--spacing-xs);
}

.form-input {
    width: 100%;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    border: 2px solid var(--gray-light);
    border-radius: var(--radius-lg);
    background: var(--white);
    transition: all 0.15s ease-out;
    font-family: inherit;
}

.form-input:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.1);
    background: #fffbfa;
}

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

.form-input.error {
    border-color: var(--error);
}

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

/* Buttons - Enhanced Professional Style */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    border: none;
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.2s ease-out;
    text-decoration: none;
    font-family: inherit;
    white-space: nowrap;
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    opacity: 0;
    transition: opacity 0.2s ease-out;
}

.btn:hover::before {
    opacity: 1;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: var(--shadow-colored);
    border: 2px solid transparent;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 12px 32px rgba(255, 107, 53, 0.35);
}

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

.btn-secondary {
    background: var(--gradient-secondary);
    color: var(--white);
    box-shadow: var(--shadow-md);
}

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

.btn-outline {
    background: transparent;
    color: var(--primary);
    border: 2px solid var(--primary);
    box-shadow: none;
}

.btn-outline:hover {
    background: var(--primary);
    color: var(--white);
    box-shadow: var(--shadow-colored);
}

.btn-full {
    width: 100%;
}

.btn-group {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

/* Alerts / Flash Messages - Enhanced */
.alert {
    padding: 1rem 1.25rem;
    border-radius: var(--radius-lg);
    margin-bottom: var(--spacing-md);
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    border-left: 4px solid;
}

.alert-success {
    background: linear-gradient(135deg, #d1fae5 0%, #a7f3d0 100%);
    color: #065f46;
    border-color: var(--success);
    box-shadow: 0 4px 12px rgba(6, 214, 160, 0.2);
}

.alert-error {
    background: linear-gradient(135deg, #fee2e2 0%, #fecaca 100%);
    color: #991b1b;
    border-color: var(--error);
    box-shadow: 0 4px 12px rgba(239, 71, 111, 0.2);
}

.alert-warning {
    background: linear-gradient(135deg, #fef3c7 0%, #fde68a 100%);
    color: #92400e;
    border-color: var(--warning);
    box-shadow: 0 4px 12px rgba(255, 209, 102, 0.2);
}

.alert-info {
    background: linear-gradient(135deg, #dbeafe 0%, #bfdbfe 100%);
    color: #1e40af;
    border-color: var(--info);
    box-shadow: 0 4px 12px rgba(17, 138, 178, 0.2);
}

/* Links */
.link {
    color: var(--primary);
    text-decoration: none;
    font-weight: var(--font-weight-medium);
    transition: color 0.2s ease;
}

.link:hover {
    color: var(--primary-dark);
    text-decoration: underline;
}

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

.text-sm {
    font-size: 0.875rem;
}

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

.divider {
    text-align: center;
    margin: var(--spacing-md) 0;
    position: relative;
}

.divider::before {
    content: '';
    position: absolute;
    left: 0;
    top: 50%;
    width: 100%;
    height: 1px;
    background: var(--gray-light);
}

.divider-text {
    position: relative;
    display: inline-block;
    padding: 0 var(--spacing-sm);
    background: var(--white);
    color: var(--gray);
    font-size: 0.875rem;
}

/* Dashboard Styles - Enhanced Professional */
.dashboard {
    min-height: 100vh;
    background: linear-gradient(180deg, #f7fafc 0%, #edf2f7 100%);
}

.navbar {
    background: var(--white);
    box-shadow: var(--shadow-md);
    padding: var(--spacing-md) 0;
    position: sticky;
    top: 0;
    z-index: 100;
    border-bottom: 3px solid var(--primary);
}

.navbar-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.navbar-brand {
    font-size: 1.5rem;
    font-weight: var(--font-weight-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-decoration: none;
}

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

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

.user-avatar {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    background: var(--gradient-primary);
    color: var(--white);
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: var(--font-weight-bold);
    box-shadow: var(--shadow-colored);
}

.dashboard-content {
    padding: var(--spacing-xl) 0;
}

.welcome-section {
    background: linear-gradient(135deg, var(--white) 0%, #fef5f1 100%);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    border-left: 5px solid var(--primary);
}

.welcome-title {
    font-size: 2.25rem;
    font-weight: var(--font-weight-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.welcome-text {
    color: var(--gray);
    font-size: 1.125rem;
}

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

.stat-card {
    background: var(--white);
    padding: var(--spacing-lg);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    transition: all 0.2s ease-out;
    border-left: 4px solid var(--primary);
    position: relative;
    overflow: hidden;
}

.stat-card::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100px;
    height: 100px;
    background: radial-gradient(circle, rgba(255, 107, 53, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
    border-left-color: var(--primary-dark);
}

.stat-value {
    font-size: 2.25rem;
    font-weight: var(--font-weight-extrabold);
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    color: var(--gray);
    font-size: 0.9375rem;
    font-weight: var(--font-weight-medium);
}

/* Responsive */
@media (max-width: 768px) {
    .card {
        padding: var(--spacing-lg);
    }
    
    .card-title {
        font-size: 1.5rem;
    }
    
    .btn-group {
        flex-direction: column;
    }
    
    .navbar-content {
        flex-direction: column;
        gap: var(--spacing-sm);
    }
    
    .navbar-menu {
        flex-direction: column;
        width: 100%;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
}

/* Loading State */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--white);
    animation: spin 0.8s linear infinite;
}

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

/* Utility Classes */
.mt-1 { margin-top: var(--spacing-xs); }
.mt-2 { margin-top: var(--spacing-sm); }
.mt-3 { margin-top: var(--spacing-md); }
.mt-4 { margin-top: var(--spacing-lg); }

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

.hidden { display: none; }
.visible { display: block; }