/* theme.css — design tokens, accessibility primitives, button utilities */

:root {
  --bg-primary: #060a10;
  --bg-secondary: #0b1018;
  --bg-tertiary: #101822;

  --color-accent-red: #ff3b4f;
  --color-accent-cyan: #00d1ff;
  --color-accent-green: #00ff80;

  --text-primary: #dfe4ed;
  --text-secondary: rgba(255, 255, 255, 0.75);
  --text-tertiary: rgba(255, 255, 255, 0.45);

  --border-color: #1a2636;
  --nav-bg: rgba(5, 6, 8, 0.95);

  --space-1: 4px;  --space-2: 8px;  --space-3: 12px;
  --space-4: 16px; --space-5: 24px; --space-6: 32px;

  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 16px;
}

/* Global polish — applies to every page that links theme.css */
html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

::selection {
  background: var(--color-accent-red);
  color: #000;
}

body {
  -webkit-tap-highlight-color: transparent;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  image-rendering: -webkit-optimize-contrast;
}

/* Prevent iOS Safari zoom on input focus (font-size < 16px triggers zoom) */
@media (max-width: 768px) {
  input, select, textarea {
    font-size: max(16px, 1em);
  }
}

/* Custom scrollbar — dark theme */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--border-color) transparent;
}
*::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
*::-webkit-scrollbar-track {
  background: transparent;
}
*::-webkit-scrollbar-thumb {
  background: var(--border-color);
  border-radius: 5px;
}
*::-webkit-scrollbar-thumb:hover {
  background: rgba(26, 38, 54, 0.8);
}

/* Tabular numerals — apply via class="tabular-nums" on numeric elements */
.tabular-nums {
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* Accessibility */
:focus-visible {
  outline: 2px solid var(--color-accent-cyan);
  outline-offset: 2px;
}

.token-item:focus-within,
.card:focus-within,
[role="button"]:focus-within {
  box-shadow: 0 0 0 2px var(--color-accent-cyan);
}

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

/* Skeleton loader — opt-in via class="skeleton" on placeholder elements */
.skeleton {
  background: linear-gradient(
    90deg,
    var(--bg-tertiary) 0%,
    rgba(255, 255, 255, 0.06) 50%,
    var(--bg-tertiary) 100%
  );
  background-size: 200% 100%;
  animation: skeleton-shimmer 1.5s ease-in-out infinite;
  border-radius: var(--radius-sm);
  color: transparent;
  pointer-events: none;
  user-select: none;
}

@keyframes skeleton-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* Button utilities — adopt page-by-page in a later PR */
.btn-primary, .btn-secondary, .btn-tertiary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 10px 16px;
  border-radius: var(--radius-md);
  font-weight: 600;
  font-size: 14px;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
  border: 1px solid transparent;
  text-decoration: none;
}

.btn-primary {
  background: linear-gradient(135deg, var(--color-accent-red), #ff1744);
  color: #000;
}
.btn-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 16px rgba(255, 59, 79, 0.25);
}

.btn-secondary {
  background: transparent;
  border-color: var(--border-color);
  color: var(--text-primary);
}
.btn-secondary:hover { background: var(--bg-tertiary); }

.btn-tertiary {
  background: var(--bg-tertiary);
  border-color: var(--border-color);
  color: var(--text-primary);
}
.btn-tertiary:hover { border-color: var(--color-accent-cyan); }

.btn-primary:active,
.btn-secondary:active,
.btn-tertiary:active {
  box-shadow: inset 0 2px 4px rgba(0, 0, 0, 0.3);
  transform: translateY(0);
}