/* ============================================================
   Subway Mahjong — Design Tokens
   ============================================================ */
:root {
  --ink:        oklch(28% 0.05 260);
  --ink-soft:   oklch(46% 0.04 260);
  --ink-faint:  oklch(62% 0.03 260);
  --paper:      oklch(97% 0.012 85);
  --paper-deep: oklch(93% 0.02 80);
  --panel:      oklch(99% 0.006 85);
  --hairline:   oklch(87% 0.02 80);

  --jade:       oklch(54% 0.15 155);
  --jade-deep:  oklch(40% 0.13 155);
  --jade-soft:  oklch(93% 0.05 155);

  --gold:       oklch(88% 0.05 85);
  --gold-deep:  oklch(62% 0.09 70);
  --gold-soft:  oklch(95% 0.03 85);

  --sun:        oklch(70% 0.16 45);
  --lacquer:    oklch(58% 0.19 32);

  --cobalt:     oklch(46% 0.18 255);
  --cobalt-soft:oklch(93% 0.04 255);

  --font-display: 'Abril Fatface', Georgia, serif;
  --font-ui: 'Work Sans', -apple-system, BlinkMacSystemFont, sans-serif;
}

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

body {
  font-family: var(--font-ui);
  background: var(--paper);
  color: var(--ink);
  min-height: 100vh;
}

.hidden { display: none !important; }
h1, h2, h3 { font-family: var(--font-display); font-weight: 400; color: var(--ink); }
p { line-height: 1.6; }
a { color: var(--jade-deep); text-decoration: none; }
a:hover { color: var(--jade); }

/* ============================================================
   Buttons
   ============================================================ */
.btn {
  display: inline-block;
  padding: 13px 28px;
  border: 2.5px solid var(--ink);
  border-radius: 999px;
  font-family: var(--font-ui);
  font-size: 1rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 0.1s, box-shadow 0.1s;
  box-shadow: 3px 3px 0 var(--ink);
  text-decoration: none;
}
.btn:active { transform: translate(3px, 3px); box-shadow: 0 0 0 var(--ink); }
.btn-primary   { background: var(--jade); color: var(--panel); }
.btn-primary:hover { background: var(--jade-deep); color: var(--panel); }
.btn-ghost     { background: var(--panel); border-color: var(--hairline); color: var(--ink-soft); box-shadow: none; }
.btn-ghost:hover { background: var(--paper-deep); border-color: var(--ink); color: var(--ink); }

/* ============================================================
   Felt Band (inner screens, not main header)
   ============================================================ */
.felt-band {
  background: var(--jade);
  border-bottom: 3px solid var(--ink);
  box-shadow: 0 6px 0 var(--jade-deep);
  padding: 20px 32px;
}

/* ============================================================
   Site Header
   ============================================================ */
.site-header {
  background: var(--jade);
  border-bottom: 4px solid var(--jade-deep);
  box-shadow: 0 4px 0 var(--jade-deep);
  padding: 0;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 32px;
  gap: 24px;
}

.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  text-decoration: none;
}

.brand-seal {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--sun);
  border: 2.5px solid var(--paper);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--paper);
  flex-shrink: 0;
}

.brand-wordmark {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 400;
  color: var(--paper);
  white-space: nowrap;
}

.site-nav {
  display: flex;
  gap: 8px;
  align-items: center;
}
.site-nav a {
  font-family: var(--font-ui);
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--paper);
  text-decoration: none;
  padding: 6px 14px;
  border: 1.5px solid rgba(255,255,255,0.35);
  border-radius: 999px;
  opacity: 0.85;
  transition: opacity 0.15s, background 0.15s, border-color 0.15s;
}
.site-nav a:hover {
  opacity: 1;
  background: rgba(255,255,255,0.12);
  border-color: rgba(255,255,255,0.7);
}

@media (max-width: 640px) {
  .header-inner { padding: 14px 20px; }
  .brand-wordmark { font-size: 1.2rem; }
  .site-nav a { padding: 5px 10px; font-size: 0.72rem; }
}

/* ============================================================
   Route Badge
   ============================================================ */
.route-badge {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  border: 3px solid var(--ink);
  background: var(--badge-color, var(--jade));
  color: #fff;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 400;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.15s, box-shadow 0.15s;
  box-shadow: 2px 2px 0 var(--ink);
  flex-shrink: 0;
}
.route-badge:hover { transform: translateY(-2px); box-shadow: 2px 4px 0 var(--ink); }
.route-badge.active { transform: scale(1.2); box-shadow: 3px 3px 0 var(--ink); }

@media (max-width: 520px) {
  .brand-wordmark { font-size: 1.4rem; }
  .site-nav { gap: 16px; }
  .felt-band { padding: 16px 20px; }
}