/**
 * BuzzersFit Design System 2025
 * 
 * Modern CSS variables, reset, and base styles
 * Supports light/dark mode via prefers-color-scheme
 */

/* ============================================
   CSS CUSTOM PROPERTIES (Variables)
   ============================================ */

:root {
  /* ─────────────────────────────────────────
     COLOR PALETTE - Primary
     ───────────────────────────────────────── */
  --color-primary: #6366f1;
  --color-primary-hover: #4f46e5;
  --color-primary-active: #4338ca;
  --color-primary-light: rgba(99, 102, 241, 0.1);
  --color-primary-glow: rgba(99, 102, 241, 0.4);

  /* Secondary */
  --color-secondary: #8b5cf6;
  --color-secondary-hover: #7c3aed;
  --color-secondary-light: rgba(139, 92, 246, 0.1);

  /* Accent */
  --color-accent: #06b6d4;
  --color-accent-hover: #0891b2;
  --color-accent-light: rgba(6, 182, 212, 0.1);

  /* ─────────────────────────────────────────
     STATUS COLORS
     ───────────────────────────────────────── */
  --color-success: #10b981;
  --color-success-hover: #059669;
  --color-success-light: rgba(16, 185, 129, 0.1);
  --color-success-bg: rgba(16, 185, 129, 0.15);

  --color-warning: #f59e0b;
  --color-warning-hover: #d97706;
  --color-warning-light: rgba(245, 158, 11, 0.1);
  --color-warning-bg: rgba(245, 158, 11, 0.15);

  --color-danger: #ef4444;
  --color-danger-hover: #dc2626;
  --color-danger-light: rgba(239, 68, 68, 0.1);
  --color-danger-bg: rgba(239, 68, 68, 0.15);

  --color-info: #3b82f6;
  --color-info-hover: #2563eb;
  --color-info-light: rgba(59, 130, 246, 0.1);
  --color-info-bg: rgba(59, 130, 246, 0.15);

  /* Medal / Podium */
  --color-medal-gold: #FFD700;
  --color-medal-gold-dark: #FFA500;
  --color-medal-gold-text: #7c4700;
  --color-medal-silver: #C0C0C0;
  --color-medal-silver-dark: #A0A0A0;
  --color-medal-silver-text: #4a4a4a;
  --color-medal-bronze: #CD7F32;
  --color-medal-bronze-dark: #8B4513;

  /* ─────────────────────────────────────────
     NEUTRAL COLORS (Light Mode)
     ───────────────────────────────────────── */
  --color-gray-50: #f9fafb;
  --color-gray-100: #f3f4f6;
  --color-gray-200: #e5e7eb;
  --color-gray-300: #d1d5db;
  --color-gray-400: #9ca3af;
  --color-gray-500: #6b7280;
  --color-gray-600: #4b5563;
  --color-gray-700: #374151;
  --color-gray-800: #1f2937;
  --color-gray-850: #182030;
  --color-gray-900: #111827;
  --color-gray-950: #030712;

  /* ─────────────────────────────────────────
     SEMANTIC COLORS (Light Mode)
     ───────────────────────────────────────── */
  --color-text: var(--color-gray-900);
  --color-text-secondary: var(--color-gray-600);
  --color-text-muted: var(--color-gray-400);
  --color-text-inverse: #ffffff;

  --color-background: #ffffff;
  --color-background-alt: var(--color-gray-50);
  --color-background-elevated: #ffffff;

  --color-border: var(--color-gray-200);
  --color-border-light: var(--color-gray-100);
  --color-border-focus: var(--color-primary);

  /* Semantic alert text colors (light mode defaults) */
  --color-info-text: var(--color-info);
  --color-success-text: var(--color-success);
  --color-warning-text: var(--color-warning);
  --color-danger-text: var(--color-danger);
  --color-warning-badge: var(--color-warning);

  /* Alert borders */
  --color-info-border: rgba(59, 130, 246, 0.3);
  --color-success-border: rgba(16, 185, 129, 0.3);
  --color-warning-border: rgba(245, 158, 11, 0.3);
  --color-warning-highlight: rgba(245, 158, 11, 0.3);
  --color-danger-border: rgba(239, 68, 68, 0.3);

  /* Focus & interactive */
  --color-focus-ring: var(--color-primary-light);
  --color-primary-hover-bg: var(--color-primary-light);
  --color-striped-row: rgba(0, 0, 0, 0.03);
  --color-loading-overlay: rgba(255, 255, 255, 0.8);

  /* Glass */
  --color-glass-border: rgba(0, 0, 0, 0.08);

  /* ─────────────────────────────────────────
     SURFACES (Glassmorphism Ready)
     ───────────────────────────────────────── */
  --surface-base: #ffffff;
  --surface-elevated: rgba(255, 255, 255, 0.9);
  --surface-overlay: rgba(255, 255, 255, 0.95);
  --surface-glass: rgba(255, 255, 255, 0.7);
  --surface-backdrop: rgba(0, 0, 0, 0.5);

  /* ─────────────────────────────────────────
     SHADOWS
     ───────────────────────────────────────── */
  --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
  --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
  --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
  --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
  --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
  --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
  --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);

  /* Glow shadows */
  --shadow-glow-primary: 0 0 20px var(--color-primary-glow);
  --shadow-glow-success: 0 0 20px rgba(16, 185, 129, 0.4);
  --shadow-glow-danger: 0 0 20px rgba(239, 68, 68, 0.4);

  /* ─────────────────────────────────────────
     BORDER RADIUS
     ───────────────────────────────────────── */
  --radius-none: 0;
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-3xl: 2rem;
  --radius-full: 9999px;

  /* ─────────────────────────────────────────
     SPACING
     ───────────────────────────────────────── */
  --space-0: 0;
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;

  /* ─────────────────────────────────────────
     TYPOGRAPHY
     ───────────────────────────────────────── */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', Consolas, Monaco, 'Courier New', monospace;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;

  --font-light: 300;
  --font-normal: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;
  --font-extrabold: 800;

  --leading-none: 1;
  --leading-tight: 1.25;
  --leading-snug: 1.375;
  --leading-normal: 1.5;
  --leading-relaxed: 1.625;
  --leading-loose: 2;

  --tracking-tighter: -0.05em;
  --tracking-tight: -0.025em;
  --tracking-normal: 0;
  --tracking-wide: 0.025em;
  --tracking-wider: 0.05em;

  /* ─────────────────────────────────────────
     TRANSITIONS & ANIMATIONS
     ───────────────────────────────────────── */
  --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);
  --transition-slower: 500ms cubic-bezier(0.4, 0, 0.2, 1);

  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);

  /* ─────────────────────────────────────────
     Z-INDEX SCALE
     ───────────────────────────────────────── */
  --z-base: 0;
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal-backdrop: 400;
  --z-modal: 500;
  --z-popover: 600;
  --z-tooltip: 700;
  --z-toast: 800;

  /* ─────────────────────────────────────────
     CONTAINER WIDTHS
     ───────────────────────────────────────── */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* ─────────────────────────────────────────
     FOCUS RING
     ───────────────────────────────────────── */
  --focus-ring-width: 3px;
  --focus-ring-offset: 2px;
  --focus-ring-color: var(--color-primary-light);
}

/* ============================================
   DARK MODE
   All theme overrides are in themes/light.css and themes/dark.css.
   data-theme is always set explicitly via JS (light or dark).
   ============================================ */

/* ============================================
   MODERN CSS RESET
   ============================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: var(--leading-normal);
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
}

/* Remove default list styles */
ul,
ol {
  list-style: none;
}

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

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

/* Images */
img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

/* Form elements */
input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

/* Buttons */
button {
  cursor: pointer;
  background: none;
  border: none;
}

/* Tables */
table {
  border-collapse: collapse;
  border-spacing: 0;
}

/* Headings */
h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: var(--font-semibold);
  line-height: var(--leading-tight);
  color: var(--color-text);
}

h1 {
  font-size: var(--text-4xl);
}

h2 {
  font-size: var(--text-3xl);
}

h3 {
  font-size: var(--text-2xl);
}

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

h5 {
  font-size: var(--text-lg);
}

h6 {
  font-size: var(--text-base);
}

/* Paragraphs */
p {
  margin-bottom: var(--space-4);
}

/* Strong */
strong,
b {
  font-weight: var(--font-semibold);
}

/* Code */
code,
kbd,
samp,
pre {
  font-family: var(--font-mono);
  font-size: 0.9em;
}

code {
  background-color: var(--color-gray-100);
  padding: 0.125em 0.375em;
  border-radius: var(--radius-sm);
}

pre {
  overflow-x: auto;
  padding: var(--space-4);
  background-color: var(--color-gray-900);
  border-radius: var(--radius-lg);
  color: var(--color-gray-100);
}

pre code {
  background: none;
  padding: 0;
}

/* Selection */
::selection {
  background-color: var(--color-primary-light);
  color: var(--color-primary);
}

/* Focus visible */
:focus-visible {
  outline: var(--focus-ring-width) solid var(--focus-ring-color);
  outline-offset: var(--focus-ring-offset);
}

/* Scrollbar styling */
::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-gray-100);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
  background: var(--color-gray-300);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-gray-400);
}

/* Dark scrollbar overrides in themes/dark.css */

/* ============================================
   BASE LAYOUT UTILITIES
   ============================================ */

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.container-fluid {
  width: 100%;
  padding-inline: var(--space-4);
}

@media (min-width: 640px) {

  .container,
  .container-fluid {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 1024px) {

  .container,
  .container-fluid {
    padding-inline: var(--space-8);
  }
}

/* ============================================
   ANIMATIONS
   ============================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(10px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

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

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(20px);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes scaleIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }

  to {
    opacity: 1;
    transform: scale(1);
  }
}

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

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.5;
  }
}

@keyframes bounce {

  0%,
  100% {
    transform: translateY(-5%);
    animation-timing-function: cubic-bezier(0.8, 0, 1, 1);
  }

  50% {
    transform: translateY(0);
    animation-timing-function: cubic-bezier(0, 0, 0.2, 1);
  }
}

@keyframes shimmer {
  0% {
    background-position: -200% 0;
  }

  100% {
    background-position: 200% 0;
  }
}

/* Animation utility classes */
.animate-fade-in {
  animation: fadeIn var(--transition-base) forwards;
}

.animate-fade-in-up {
  animation: fadeInUp var(--transition-slow) forwards;
}

.animate-fade-in-down {
  animation: fadeInDown var(--transition-slow) forwards;
}

.animate-slide-in-left {
  animation: slideInLeft var(--transition-slow) forwards;
}

.animate-slide-in-right {
  animation: slideInRight var(--transition-slow) forwards;
}

.animate-scale-in {
  animation: scaleIn var(--transition-base) forwards;
}

.animate-spin {
  animation: spin 1s linear infinite;
}

.animate-pulse {
  animation: pulse 2s ease-in-out infinite;
}

.animate-bounce {
  animation: bounce 1s infinite;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ============================================
   SCREEN READER ONLY
   ============================================ */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}