/**
 * BOOPAS - Design System
 * Modern, Premium, Professional UI/UX
 * Based on Stripe, Linear, Vercel standards
 */

:root {
    /* Color Palette */
    --color-primary: #d12020;          /* Primary Red */
    --color-secondary: #f4610c;        /* Secondary Orange */
    --color-dark: #151615;             /* Dark Background */
    --color-surface: #feffff;          /* Light Surface */
    
    /* Semantic Colors */
    --color-success: #10b981;          /* Emerald */
    --color-warning: #f59e0b;          /* Amber */
    --color-error: #ef4444;            /* Red */
    --color-info: #3b82f6;             /* Blue */
    
    /* Neutral Colors */
    --color-text-primary: #1f2937;     /* Dark Gray */
    --color-text-secondary: #6b7280;   /* Medium Gray */
    --color-text-tertiary: #9ca3af;    /* Light Gray */
    --color-border: #e5e7eb;           /* Border Gray */
    --color-bg-primary: #feffff;       /* White */
    --color-bg-secondary: #f9fafb;     /* Off-White */
    --color-bg-tertiary: #f3f4f6;      /* Light Gray */
    
    /* Dark Mode */
    --color-dark-bg-primary: #0f1117;
    --color-dark-bg-secondary: #161b22;
    --color-dark-bg-tertiary: #21262d;
    --color-dark-text-primary: #e6edf3;
    --color-dark-text-secondary: #8b949e;
    --color-dark-border: #30363d;
    
    /* Spacing Scale - 4px Base */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 12px;
    --spacing-lg: 16px;
    --spacing-xl: 24px;
    --spacing-2xl: 32px;
    --spacing-3xl: 48px;
    --spacing-4xl: 64px;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Helvetica Neue', sans-serif;
    --font-mono: 'Courier New', monospace;
    
    /* Font Sizes */
    --text-xs: 12px;
    --text-sm: 14px;
    --text-base: 16px;
    --text-lg: 18px;
    --text-xl: 20px;
    --text-2xl: 24px;
    --text-3xl: 28px;
    --text-4xl: 36px;
    --text-5xl: 48px;
    
    /* Line Heights */
    --line-height-tight: 1.2;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.75;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 20px;
    --radius-2xl: 24px;
    --radius-full: 9999px;
    
    /* Shadows */
    --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-sm: 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);
    
    /* Transitions */
    --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Dark Mode Variables */
@media (prefers-color-scheme: dark) {
    :root {
        --color-text-primary: #e6edf3;
        --color-text-secondary: #8b949e;
        --color-text-tertiary: #6e7681;
        --color-bg-primary: #0f1117;
        --color-bg-secondary: #161b22;
        --color-bg-tertiary: #21262d;
        --color-border: #30363d;
        --color-surface: #161b22;
    }
}

/* This app toggles a .dark class on <html> (see app.js) independently of the
   OS-level prefers-color-scheme above - keep both in sync. */
:root.dark {
    --color-text-primary: #e6edf3;
    --color-text-secondary: #8b949e;
    --color-text-tertiary: #6e7681;
    --color-bg-primary: #0f1117;
    --color-bg-secondary: #161b22;
    --color-bg-tertiary: #21262d;
    --color-border: #30363d;
    --color-surface: #161b22;
}

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

html {
    scroll-behavior: smooth;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* Body */
body {
    font-family: var(--font-family);
    font-size: var(--text-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background-color: var(--color-bg-primary);
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 600;
    line-height: var(--line-height-tight);
    margin-bottom: var(--spacing-md);
}

h1 {
    font-size: var(--text-5xl);
    font-weight: 700;
    letter-spacing: -0.5px;
}

h2 {
    font-size: var(--text-4xl);
    font-weight: 700;
}

h3 {
    font-size: var(--text-3xl);
    font-weight: 600;
}

h4 {
    font-size: var(--text-2xl);
    font-weight: 600;
}

h5 {
    font-size: var(--text-xl);
    font-weight: 600;
}

h6 {
    font-size: var(--text-lg);
    font-weight: 600;
}

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

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

a:hover {
    color: var(--color-secondary);
}

/* Buttons */
.btn,
.btn-primary,
.btn-secondary,
.btn-ghost,
.btn-danger {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    min-height: 44px;
    padding: var(--spacing-md) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-size: var(--text-base);
    font-weight: 600;
    cursor: pointer;
    transition: all var(--transition-fast);
    position: relative;
    overflow: hidden;
    user-select: none;
    text-decoration: none;
    line-height: 1.1;
}

.btn:focus-visible,
.btn-primary:focus-visible,
.btn-secondary:focus-visible,
.btn-ghost:focus-visible,
.btn-danger:focus-visible {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.btn:disabled,
.btn-primary:disabled,
.btn-secondary:disabled,
.btn-ghost:disabled,
.btn-danger:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* Primary Button */
.btn-primary {
    background: linear-gradient(135deg, var(--color-primary), var(--color-secondary));
    color: var(--color-surface);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(0);
}

/* Secondary Button */
.btn-secondary {
    background: var(--color-bg-secondary);
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-secondary:hover:not(:disabled) {
    background: var(--color-bg-tertiary);
    border-color: var(--color-text-secondary);
}

/* Ghost Button */
.btn-ghost {
    background: transparent;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border);
}

.btn-ghost:hover:not(:disabled) {
    background: var(--color-bg-secondary);
}

/* Danger Button */
.btn-danger {
    background: var(--color-error);
    color: white;
    box-shadow: var(--shadow-sm);
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* Small Button */
.btn-sm {
    padding: var(--spacing-sm) var(--spacing-md);
    font-size: var(--text-sm);
}

/* Large Button */
.btn-lg {
    padding: var(--spacing-lg) var(--spacing-2xl);
    font-size: var(--text-lg);
}

@media (max-width: 640px) {
    .btn,
    .btn-primary,
    .btn-secondary,
    .btn-ghost,
    .btn-danger,
    .btn-sm,
    .btn-lg {
        width: 100%;
    }
}

/* Input Fields */
.input-field {
    display: block;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    font-family: inherit;
    font-size: var(--text-base);
    line-height: var(--line-height-normal);
    color: var(--color-text-primary);
    background: var(--color-bg-primary);
    transition: all var(--transition-fast);
}

.input-field:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(209, 32, 32, 0.1);
}

.input-field::placeholder {
    color: var(--color-text-tertiary);
}

.input-field:disabled {
    background: var(--color-bg-secondary);
    cursor: not-allowed;
    opacity: 0.6;
}

/* Cards */
.card {
    background: var(--color-bg-primary);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-base);
}

.card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-text-tertiary);
}

/* Sections */
.section {
    margin-bottom: var(--spacing-3xl);
}

.section-title {
    font-size: var(--text-2xl);
    font-weight: 700;
    margin-bottom: var(--spacing-xl);
}

/* Containers */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

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

/* Grid */
.grid {
    display: grid;
    gap: var(--spacing-xl);
}

.grid-cols-1 { grid-template-columns: 1fr; }
.grid-cols-2 { grid-template-columns: repeat(2, 1fr); }
.grid-cols-3 { grid-template-columns: repeat(3, 1fr); }
.grid-cols-4 { grid-template-columns: repeat(4, 1fr); }

@media (max-width: 768px) {
    .grid-cols-2, .grid-cols-3, .grid-cols-4 {
        grid-template-columns: 1fr;
    }
}

/* Flexbox */
.flex { display: flex; }
.flex-col { flex-direction: column; }
.flex-center { justify-content: center; align-items: center; }
.flex-between { justify-content: space-between; align-items: center; }
.flex-start { justify-content: flex-start; align-items: center; }
.flex-end { justify-content: flex-end; align-items: center; }

.gap-xs { gap: var(--spacing-xs); }
.gap-sm { gap: var(--spacing-sm); }
.gap-md { gap: var(--spacing-md); }
.gap-lg { gap: var(--spacing-lg); }
.gap-xl { gap: var(--spacing-xl); }

/* Spacing */
.m-0 { margin: 0; }
.m-xs { margin: var(--spacing-xs); }
.m-sm { margin: var(--spacing-sm); }
.m-md { margin: var(--spacing-md); }
.m-lg { margin: var(--spacing-lg); }
.m-xl { margin: var(--spacing-xl); }
.m-2xl { margin: var(--spacing-2xl); }
.m-3xl { margin: var(--spacing-3xl); }

.mt-0 { margin-top: 0; }
.mt-xs { margin-top: var(--spacing-xs); }
.mt-sm { margin-top: var(--spacing-sm); }
.mt-md { margin-top: var(--spacing-md); }
.mt-lg { margin-top: var(--spacing-lg); }
.mt-xl { margin-top: var(--spacing-xl); }
.mt-2xl { margin-top: var(--spacing-2xl); }
.mt-3xl { margin-top: var(--spacing-3xl); }

.mb-0 { margin-bottom: 0; }
.mb-xs { margin-bottom: var(--spacing-xs); }
.mb-sm { margin-bottom: var(--spacing-sm); }
.mb-md { margin-bottom: var(--spacing-md); }
.mb-lg { margin-bottom: var(--spacing-lg); }
.mb-xl { margin-bottom: var(--spacing-xl); }
.mb-2xl { margin-bottom: var(--spacing-2xl); }
.mb-3xl { margin-bottom: var(--spacing-3xl); }

.mx-auto { margin-left: auto; margin-right: auto; }

.p-0 { padding: 0; }
.p-xs { padding: var(--spacing-xs); }
.p-sm { padding: var(--spacing-sm); }
.p-md { padding: var(--spacing-md); }
.p-lg { padding: var(--spacing-lg); }
.p-xl { padding: var(--spacing-xl); }
.p-2xl { padding: var(--spacing-2xl); }
.p-3xl { padding: var(--spacing-3xl); }

/* Alerts */
.alert {
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border-left: 4px solid;
    display: flex;
    gap: var(--spacing-lg);
    align-items: flex-start;
}

.alert-success {
    background: #f0fdf4;
    border-color: var(--color-success);
    color: #166534;
}

.alert-error {
    background: #fef2f2;
    border-color: var(--color-error);
    color: #991b1b;
}

.alert-warning {
    background: #fffbeb;
    border-color: var(--color-warning);
    color: #92400e;
}

.alert-info {
    background: #eff6ff;
    border-color: var(--color-info);
    color: #1e40af;
}

@media (prefers-color-scheme: dark) {
    .alert-success { background: #064e3b; color: #a7f3d0; }
    .alert-error { background: #7f1d1d; color: #fecaca; }
    .alert-warning { background: #78350f; color: #fcd34d; }
    .alert-info { background: #0c2340; color: #93c5fd; }
}

/* Loading State */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

@keyframes shimmer {
    0% { background-position: -1000px 0; }
    100% { background-position: 1000px 0; }
}

.skeleton {
    background: linear-gradient(90deg, var(--color-bg-secondary) 25%, var(--color-bg-tertiary) 50%, var(--color-bg-secondary) 75%);
    background-size: 200% 100%;
    animation: shimmer 2s infinite;
}

/* Badges */
.badge {
    display: inline-flex;
    align-items: center;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-full);
    font-size: var(--text-xs);
    font-weight: 600;
}

.badge-primary {
    background: rgba(209, 32, 32, 0.1);
    color: var(--color-primary);
}

.badge-success {
    background: rgba(16, 185, 129, 0.1);
    color: var(--color-success);
}

.badge-warning {
    background: rgba(245, 158, 11, 0.1);
    color: var(--color-warning);
}

.badge-error {
    background: rgba(239, 68, 68, 0.1);
    color: var(--color-error);
}

/* Responsive */
@media (max-width: 768px) {
    h1 { font-size: var(--text-4xl); }
    h2 { font-size: var(--text-3xl); }
    h3 { font-size: var(--text-2xl); }
    
    .btn { padding: var(--spacing-sm) var(--spacing-md); font-size: var(--text-sm); }
    .input-field { padding: var(--spacing-sm) var(--spacing-md); font-size: var(--text-sm); }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }
    
    .btn, .card {
        box-shadow: none;
        border: 1px solid #ccc;
    }
}