/**
 * Padel Club Suite - Design System
 * Modern, Clean, World-Class Design
 * Mobile-First, Touch-Optimized
 */

:root {
    /* === COLORS === */
    /* Primary (Padel Green) */
    --color-primary: #00C853;
    --color-primary-dark: #00A844;
    --color-primary-light: #69F0AE;
    --color-primary-alpha: rgba(0, 200, 83, 0.1);
    
    /* Secondary (Court Orange) */
    --color-secondary: #FF6B35;
    --color-secondary-dark: #E55A2B;
    --color-secondary-light: #FF9671;
    
    /* Neutrals */
    --color-bg-primary: #FFFFFF;
    --color-bg-secondary: #F8F9FA;
    --color-bg-tertiary: #E9ECEF;
    --color-surface: #FFFFFF;
    --color-surface-hover: #F5F5F5;
    
    /* Text */
    --color-text-primary: #212529;
    --color-text-secondary: #6C757D;
    --color-text-tertiary: #ADB5BD;
    --color-text-inverse: #FFFFFF;
    
    /* Status */
    --color-success: #28A745;
    --color-warning: #FFC107;
    --color-error: #DC3545;
    --color-info: #17A2B8;
    
    /* === SPACING === */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    
    /* === TYPOGRAPHY === */
    --font-family-primary: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-family-display: 'Inter', var(--font-family-primary);
    
    --font-size-xs: 12px;
    --font-size-sm: 14px;
    --font-size-base: 16px;
    --font-size-lg: 18px;
    --font-size-xl: 20px;
    --font-size-2xl: 24px;
    --font-size-3xl: 32px;
    --font-size-4xl: 40px;
    
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    --line-height-tight: 1.25;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* === BORDERS === */
    --border-radius-sm: 8px;
    --border-radius-md: 12px;
    --border-radius-lg: 16px;
    --border-radius-xl: 24px;
    --border-radius-full: 9999px;
    
    --border-width: 1px;
    --border-width-thick: 2px;
    
    /* === SHADOWS === */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-base: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* === TRANSITIONS === */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);
    
    /* === Z-INDEX === */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
}

/* === DARK MODE === */
@media (prefers-color-scheme: dark) {
    :root {
        --color-bg-primary: #1A1A1A;
        --color-bg-secondary: #242424;
        --color-bg-tertiary: #2E2E2E;
        --color-surface: #242424;
        --color-surface-hover: #2E2E2E;
        
        --color-text-primary: #FFFFFF;
        --color-text-secondary: #B0B0B0;
        --color-text-tertiary: #808080;
    }
}

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

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

/* === UTILITIES === */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

@media (min-width: 768px) {
    .container {
        padding: 0 var(--space-lg);
    }
}

.card {
    background: var(--color-surface);
    border-radius: var(--border-radius-lg);
    box-shadow: var(--shadow-base);
    transition: box-shadow var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-lg);
}

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    font-size: var(--font-size-base);
    font-weight: var(--font-weight-medium);
    line-height: var(--line-height-tight);
    border-radius: var(--border-radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    text-decoration: none;
    white-space: nowrap;
}

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

.btn-primary:hover {
    background: var(--color-primary-dark);
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.btn-secondary {
    background: var(--color-secondary);
    color: var(--color-text-inverse);
}

.btn-outline {
    background: transparent;
    border: var(--border-width-thick) solid var(--color-primary);
    color: var(--color-primary);
}

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

.btn-sm {
    padding: var(--space-xs) var(--space-md);
    font-size: var(--font-size-sm);
}

/* === LOADING STATES === */
@keyframes spin {
    to { transform: rotate(360deg); }
}

.spinner {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-top-color: white;
    border-radius: 50%;
    animation: spin 0.6s linear infinite;
}

/* === SKELETON LOADING === */
@keyframes shimmer {
    0% { background-position: -200% 0; }
    100% { background-position: 200% 0; }
}

.skeleton {
    background: linear-gradient(
        90deg,
        var(--color-bg-tertiary) 0%,
        var(--color-surface-hover) 50%,
        var(--color-bg-tertiary) 100%
    );
    background-size: 200% 100%;
    animation: shimmer 1.5s ease-in-out infinite;
    border-radius: var(--border-radius-sm);
}

/* === BADGES === */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--space-xs) var(--space-sm);
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    border-radius: var(--border-radius-full);
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

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

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

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

/* === MOBILE OPTIMIZATIONS === */
@media (max-width: 767px) {
    body {
        font-size: var(--font-size-sm);
    }
    
    .btn {
        min-height: 44px; /* iOS touch target */
    }
}