/* ==========================================================================
   style.css — Shared base styles: design tokens, resets, layout primitives,
   navigation, and the split-flap numeral component used for train numbers.
   Every page loads this file first, then a page-specific stylesheet.
   ========================================================================== */

/* ---- Design tokens -------------------------------------------------- */
:root {
  /* Surfaces */
  --color-bg: #0d1113;
  --color-surface: #161c1f;
  --color-surface-raised: #1d2427;
  --color-border: #2b3438;
  --color-border-strong: #3a4549;

  /* Text */
  --color-text: #e7ecec;
  --color-text-muted: #8c9a9d;
  --color-text-faint: #5f6c6f;

  /* Signal accents — borrowed from railway indicator lamps */
  --color-amber: #f2b705;
  --color-amber-dim: #a37f0f;
  --color-green: #3e8e63;
  --color-red: #c1502e;

  /* Type */
  --font-display: 'IBM Plex Mono', ui-monospace, monospace;
  --font-body: 'IBM Plex Sans', -apple-system, BlinkMacSystemFont, sans-serif;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;

  /* Shape */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 14px;

  /* Motion */
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --duration: 150ms;

  --max-width: 1180px;
}

@media (prefers-reduced-motion: reduce) {
  * { animation-duration: 0.001ms !important; transition-duration: 0.001ms !important; }
}

/* ---- Reset ------------------------------------------------------------ */
*, *::before, *::after { box-sizing: border-box; }

html { color-scheme: dark; }

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }

a { color: inherit; text-decoration: none; }

h1, h2, h3, h4, p { margin: 0; }

button, input { font-family: inherit; font-size: inherit; color: inherit; }

button { cursor: pointer; }

:focus-visible {
  outline: 2px solid var(--color-amber);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: var(--space-5);
}

/* ---- Site header / navigation ----------------------------------------- */
.site-header {
  border-bottom: 1px solid var(--color-border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
}

.site-title {
  font-family: var(--font-display);
  font-size: 0.85rem;
  letter-spacing: 0.04em;
  color: var(--color-text-muted);
}

.main-nav__list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-5);
}

.main-nav__link {
  font-size: 0.9rem;
  color: var(--color-text-muted);
}

.main-nav__link:hover,
.main-nav__link:focus-visible {
  color: var(--color-text);
}

.main-nav__link[aria-current='page'] {
  color: var(--color-amber);
}

/* ---- Search box --------------------------------------------------------- */
.search-box {
  position: relative;
  display: flex;
  align-items: center;
}

.search-box svg {
  position: absolute;
  left: var(--space-4);
  width: 16px;
  height: 16px;
  color: var(--color-text-faint);
  pointer-events: none;
}

.search-box input {
  width: 100%;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-3) var(--space-4) var(--space-3) 2.6rem;
  color: var(--color-text);
  transition: border-color var(--duration) var(--ease);
}

.search-box input::placeholder { color: var(--color-text-faint); }

.search-box input:focus {
  border-color: var(--color-amber-dim);
  outline: none;
}

/* ---- Buttons -------------------------------------------------------------- */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-border-strong);
  background: var(--color-surface-raised);
  color: var(--color-text);
  font-size: 0.85rem;
  font-weight: 500;
  transition: border-color var(--duration) var(--ease), background var(--duration) var(--ease);
}

.button:hover,
.button:focus-visible {
  border-color: var(--color-amber-dim);
  background: var(--color-surface);
}

/* ---- Card primitive ------------------------------------------------------ */
.card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: border-color var(--duration) var(--ease);
}

/* ---- Train numbers -------------------------------------------------------- */
/* Plain train number styling */

.train-number {
    font-weight: 700;
    color: #ffffff;
    letter-spacing: 0.02em;
    display: inline-block;
}

.train-number--sm {
    font-size: 1.1rem;
}

.train-number--md {
    font-size: 1.6rem;
}

.train-number--lg {
    font-size: 2.8rem;
}

/* ---- State helpers -------------------------------------------------------- */
.is-hidden { display: none !important; }

.empty-state {
  text-align: center;
  padding: var(--space-7) var(--space-4);
  color: var(--color-text-muted);
}

.empty-state h3 { color: var(--color-text); margin-bottom: var(--space-2); font-size: 1.05rem; }

.skeleton {
  border-radius: var(--radius-lg);
  background: linear-gradient(90deg, var(--color-surface) 25%, var(--color-surface-raised) 37%, var(--color-surface) 63%);
  background-size: 400% 100%;
  animation: skeleton-loading 1.4s ease infinite;
  height: 120px;
}

@keyframes skeleton-loading {
  0% { background-position: 100% 50%; }
  100% { background-position: 0 50%; }
}

@media (max-width: 560px) {
  .site-header__inner { flex-direction: column; align-items: flex-start; gap: var(--space-3); }
}