/* ========================================================================
   CSS Variables - Design System
   ======================================================================== */
:root {
  /* Light mode colors */
  --color-background: #f9fafb;
  --color-text: #111827;
  --color-text-muted: #6b7280;
  --color-text-light: #4b5563;

  --color-white: #ffffff;
  --color-surface: #ffffff;
  --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-green-300: #86efac;
  --color-green-500: #22c55e;
  --color-green-600: #16a34a;
  --color-green-700: #15803d;
  --color-green-800: #14532d;
  --color-green-50: #f0fdf4;

  --color-red-600: #dc2626;
  --color-orange-600: #ea580c;
  --color-blue-100: #dbeafe;
  --color-blue-300: #93c5fd;
  --color-blue-700: #1e40af;

  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2rem;

  /* Typography */
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.5rem;

  /* Borders */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem;

  /* Transitions */
  --transition-fast: 0.15s;
}

/* Dark mode colors - automatically applies when system is in dark mode */
@media (prefers-color-scheme: dark) {
  :root {
    --color-background: #1a1a1a;
    --color-text: #f1f5f9;
    --color-text-muted: #b8bfc7;
    --color-text-light: #d4dae0;

    --color-surface: #242424;
    --color-gray-100: #2a2a2a;
    --color-gray-200: #3a3a3a;
    --color-gray-300: #6a6a6a;
    --color-gray-400: #9a9a9a;
    --color-gray-500: #cacaca;
    --color-gray-600: #e0e0e0;
    --color-gray-700: #f0f0f0;

    --color-green-300: #4ade80;
    --color-green-500: #22c55e;
    --color-green-600: #16a34a;
    --color-green-700: #15803d;
    --color-green-800: #166534;
    --color-green-50: #052e16;

    --color-red-600: #ef4444;
    --color-orange-600: #f97316;
    --color-blue-100: #1e3a8a;
    --color-blue-300: #60a5fa;
    --color-blue-700: #93c5fd;
  }
}

/* ========================================================================
   Reset and Base Styles
   ======================================================================== */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  background-color: var(--color-background);
  color: var(--color-text);
  line-height: 1.5;
}

/* ========================================================================
   Layout Components
   ======================================================================== */
.container {
  max-width: 80rem;
  margin: 0 auto;
}

/* Header */
header {
  background-color: var(--color-surface);
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1);
  border-bottom: 1px solid var(--color-gray-200);
  padding: var(--spacing-lg) var(--spacing-xl);
}

header h1 {
  font-size: var(--font-size-xl);
  font-weight: bold;
  color: var(--color-text);
}

header p {
  color: var(--color-text-muted);
  margin-top: var(--spacing-xs);
}

/* ========================================================================
   Personal Message
   ======================================================================== */
.personal-message {
  padding: var(--spacing-xl);
  padding-bottom: var(--spacing-sm);
}

.personal-message p {
  color: var(--color-text);
  font-size: var(--font-size-base);
  line-height: 1.5;
  max-width: 40rem;
  margin: 0 auto;
  text-align: center;
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--color-gray-200);
}

/* ========================================================================
   Game Grid
   ======================================================================== */
.games-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: var(--spacing-lg);
  padding: var(--spacing-xl);
}

@media (min-width: 768px) {
  .games-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .games-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

/* ========================================================================
   Game Cards
   ======================================================================== */
.game-card {
  padding: var(--spacing-lg);
  border-radius: var(--border-radius-lg);
  border: 1px solid;
  transition: all var(--transition-fast);
}

.game-card--available {
  border-color: var(--color-green-500);
  background-color: var(--color-green-50);
}

.game-card--available:hover {
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1),
    0 2px 4px -2px rgba(0, 0, 0, 0.1);
}

.game-card--claimed {
  opacity: 0.5;
  background-color: var(--color-gray-100);
  border-color: var(--color-gray-200);
}

.game-card p {
  margin: 0;
}

.game-card .opponent {
  font-weight: 600;
}

.game-card .datetime {
  font-size: var(--font-size-sm);
  color: var(--color-text-muted);
}

/* ========================================================================
   Buttons
   ======================================================================== */

/* Base button styles shared by all variants */
.btn-primary,
.btn-secondary {
  /* Display */
  display: inline-block;

  /* Box model */
  padding: var(--spacing-sm) var(--spacing-lg);
  margin: 0;
  border: none;
  border-radius: var(--border-radius-md);

  /* Typography */
  font-family: inherit;
  font-size: var(--font-size-sm);
  font-weight: 500;
  line-height: 1.25rem;
  text-align: center;
  text-decoration: none;

  /* Visual */
  cursor: pointer;
  transition: all var(--transition-fast) ease;

  /* Ensure consistent height */
  min-height: 2.25rem;
  box-sizing: border-box;
}

/* Primary button colors */
.btn-primary {
  background-color: var(--color-green-600);
  color: var(--color-white);
}

.btn-primary:hover:not(:disabled) {
  background-color: var(--color-green-700);
}

.btn-primary:active:not(:disabled) {
  background-color: var(--color-green-800);
}

.btn-primary:focus-visible {
  outline: 2px solid var(--color-green-600);
  outline-offset: 2px;
}

/* Secondary button colors */
.btn-secondary {
  background-color: var(--color-gray-300);
  color: var(--color-gray-700);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-gray-400);
}

.btn-secondary:active:not(:disabled) {
  background-color: var(--color-text-muted);
}

.btn-secondary:focus-visible {
  outline: 2px solid var(--color-gray-500);
  outline-offset: 2px;
}

/* Button in game cards - smaller variant */
.game-card .btn-primary {
  padding: 0.375rem var(--spacing-md);
  min-height: 2rem;
  margin-top: var(--spacing-sm);
  width: 100%;
}

/* ========================================================================
   Badges
   ======================================================================== */
.badge-claimed {
  display: inline-block;
  background-color: var(--color-gray-300);
  color: var(--color-gray-600);
  padding: var(--spacing-xs) var(--spacing-md);
  border-radius: var(--border-radius-sm);
  font-size: var(--font-size-sm);
  margin-top: var(--spacing-sm);
}

/* ========================================================================
   Modal Dialog
   ======================================================================== */
.modal-dialog {
  padding: var(--spacing-xl);
  border-radius: var(--border-radius-lg);
  box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1),
    0 8px 10px -6px rgba(0, 0, 0, 0.1);
  width: 24rem;
  max-width: 90vw;
  background-color: var(--color-surface);
  border: none;
  margin: auto;
}

.modal-dialog::backdrop {
  background-color: rgba(0, 0, 0, 0.5);
}

.modal-dialog h2 {
  font-size: var(--font-size-lg);
  font-weight: 600;
  margin-bottom: var(--spacing-xs);
  color: var(--color-text);
}

.modal-dialog .subtitle {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-lg);
}

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

.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 500;
  color: var(--color-gray-700);
  margin-bottom: var(--spacing-xs);
}

.form-input {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--color-gray-300);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-sm);
  font-family: inherit;
}

/* Prevent iOS zoom on focus - inputs need 16px minimum */
@media (max-width: 768px) {
  .form-input {
    font-size: 16px;
  }
}

.form-input:focus {
  outline: none;
  border-color: var(--color-green-500);
  box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.1);
}

.form-input::placeholder {
  color: var(--color-gray-400);
}

textarea.form-input {
  resize: vertical;
  min-height: 4rem;
}

/* Modal action buttons container */
.modal-actions {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
}

.modal-actions button {
  flex: 1;
}

/* ========================================================================
   State Classes
   ======================================================================== */

/* Disabled state */
input:disabled,
textarea:disabled,
button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  background-color: var(--color-gray-100);
}

/* Status messages */
.status-message {
  font-weight: 500;
  margin-bottom: var(--spacing-lg);
}

.status-success {
  color: var(--color-green-600);
}

.status-error {
  color: var(--color-red-600);
}

.status-warning {
  color: var(--color-orange-600);
}

/* Loading indicator */
.loading-message {
  text-align: center;
  padding: var(--spacing-md);
  background-color: var(--color-blue-100);
  border-radius: var(--border-radius-md);
  border: 1px solid var(--color-blue-300);
  color: var(--color-blue-700);
  font-weight: 500;
  margin-top: var(--spacing-sm);
}

/* ========================================================================
   Utility Classes
   ======================================================================== */
.hidden {
  display: none !important;
}

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

.flex {
  display: flex;
}

.justify-center {
  justify-content: center;
}

.mb-2 {
  margin-bottom: var(--spacing-sm);
}

.mb-4 {
  margin-bottom: var(--spacing-lg);
}

/* Centered single button container */
.single-button {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.single-button button {
  min-width: 6rem;
}

/* ========================================================================
   Dark Mode Adjustments
   ======================================================================== */
@media (prefers-color-scheme: dark) {
  /* Adjust shadows for dark mode */
  header {
    box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.3);
  }

  .game-card--available:hover {
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3),
      0 2px 4px -2px rgba(0, 0, 0, 0.3);
  }

  .modal-dialog {
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5),
      0 8px 10px -6px rgba(0, 0, 0, 0.5);
  }

  .modal-dialog::backdrop {
    background-color: rgba(0, 0, 0, 0.75);
  }

  /* Form inputs need better borders in dark mode */
  .form-input {
    background-color: var(--color-background);
    color: var(--color-text);
  }

  .form-input:focus {
    box-shadow: 0 0 0 3px rgba(34, 197, 94, 0.2);
  }

  /* Disabled state in dark mode */
  input:disabled,
  textarea:disabled,
  button:disabled {
    background-color: var(--color-gray-100);
    color: var(--color-gray-400);
  }
}