/* Shared UI components for the ArenaLab site shell (Phase 5).
   Built on tokens.css. Reused by index.html (landing) + dashboard.html + auth.html. */

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-ui);
  -webkit-font-smoothing: antialiased;
  line-height: 1.5;
}
a { color: inherit; }
img { display: block; }

/* ── Layout ─────────────────────────────────────────────────────────── */
.container { max-width: 1240px; margin: 0 auto; padding: 0 36px; }
.mono { font-family: var(--font-mono); }

/* ── Sticky nav header ──────────────────────────────────────────────── */
.nav {
  position: sticky; top: 0; z-index: 50;
  display: flex; align-items: center; justify-content: space-between; gap: 24px;
  padding: 13px 36px;
  background: rgba(22, 22, 22, .85); backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.nav-left { display: flex; align-items: center; gap: 44px; }
.brand { display: flex; align-items: center; gap: 11px; cursor: pointer; text-decoration: none; }
.brand img { height: 30px; width: auto; mix-blend-mode: screen; }
.brand .wordmark { font-size: 15px; letter-spacing: .2em; color: var(--fg); }
.brand .wordmark b { font-weight: 700; }
.brand .wordmark span { font-weight: 300; }
.nav-links { display: flex; gap: 28px; }
.nav-links a { font-size: 13.5px; font-weight: 500; color: var(--fg-2); text-decoration: none; transition: color .15s; }
.nav-links a:hover, .nav-links a.active { color: var(--fg); }
.nav-right { display: flex; align-items: center; gap: 14px; }

/* ── Buttons ────────────────────────────────────────────────────────── */
.btn { font-family: var(--font-ui); font-weight: 600; border-radius: var(--radius); cursor: pointer; transition: background .15s, border-color .15s, color .15s; border: none; display: inline-block; text-align: center; text-decoration: none; line-height: 1.2; }
.btn-teal { color: var(--ink-teal); background: var(--teal); padding: 9px 18px; font-size: 13.5px; }
.btn-teal:hover { background: var(--teal-hover); }
.btn-teal:active { background: var(--teal-active); }
.btn-teal.lg { font-size: 15px; padding: 13px 26px; }
.btn-teal.block { width: 100%; padding: 10px; }
.btn-ghost { color: var(--fg-2); background: transparent; border: 1px solid var(--border); padding: 9px 18px; font-size: 13.5px; }
.btn-ghost:hover { border-color: var(--teal); color: var(--fg); }
.btn-ghost.lg { font-size: 15px; padding: 13px 22px; }
.btn-link { background: transparent; border: none; color: var(--fg-2); font-weight: 600; font-size: 13.5px; padding: 9px 8px; cursor: pointer; }
.btn-link:hover { color: var(--fg); }
.btn:disabled { opacity: .5; cursor: not-allowed; }

/* ── Pills / badges ─────────────────────────────────────────────────── */
.pill { display: inline-flex; align-items: center; gap: 6px; font-size: 11px; font-weight: 700; letter-spacing: .04em; padding: 4px 10px; border-radius: var(--radius-pill); }
.pill-live { color: var(--ink-teal); background: var(--teal); }
.pill-soon { color: var(--yellow-ink); background: var(--yellow); }
.pill-dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.tag { font-size: 11px; font-weight: 600; padding: 3px 9px; border-radius: var(--radius-pill); border: 1px solid var(--border); color: var(--fg-2); }
.tag.beg { color: var(--teal); border-color: rgba(118,171,174,.4); background: var(--teal-tint); }
.tag.mid { color: var(--yellow); border-color: rgba(255,212,96,.35); background: rgba(255,212,96,.08); }
.tag.adv { color: var(--red); border-color: rgba(215,35,35,.4); background: rgba(215,35,35,.09); }

/* ── Cards ──────────────────────────────────────────────────────────── */
.card { background: var(--panel); border: 1px solid var(--border); border-radius: var(--radius-card); }

/* Arena card (the simulator-picker slot — sumo LIVE, others COMING SOON) */
.arena-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.arena { border: 1px solid var(--border); border-radius: var(--radius-card); overflow: hidden; background: var(--panel); }
.arena.live { transition: transform .18s ease, border-color .18s ease; }
.arena.live:hover { transform: translateY(-4px); border-color: var(--teal); }
.arena.soon { opacity: .92; }
.arena-media { position: relative; aspect-ratio: 16 / 10; background: var(--canvas); overflow: hidden; }
.arena-media img { width: 100%; height: 100%; object-fit: cover; }
.arena-media .pill { position: absolute; top: 12px; left: 12px; }
.arena-body { padding: 18px; }
.arena-body h3 { margin: 0 0 6px; font-size: 18px; font-weight: 700; color: var(--fg); }
.arena-body p { margin: 0 0 14px; font-size: 13px; line-height: 1.5; color: var(--fg-muted); }
.arena-tags { display: flex; gap: 6px; margin-bottom: 16px; }

/* ── Footer ─────────────────────────────────────────────────────────── */
.footer { border-top: 1px solid var(--border); padding: 30px 36px; max-width: 1240px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; gap: 18px; flex-wrap: wrap; }
.footer .brand .wordmark { font-size: 13px; letter-spacing: .18em; color: var(--fg-2); }
.footer .brand img { height: 24px; }
.footer-links { display: flex; gap: 22px; }
.footer-links a { font-size: 12.5px; color: var(--fg-muted); text-decoration: none; transition: color .15s; }
.footer-links a:hover { color: var(--fg); }
.footer .copy { font-size: 12px; color: var(--fg-muted); }

/* ── Site footer (multi-column) ─────────────────────────────────────── */
.site-footer { border-top: 1px solid var(--border); margin-top: 80px; background: var(--panel-2, transparent); }
.site-footer .footer-top {
  max-width: 1240px; margin: 0 auto; padding: 56px 36px 40px;
  display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr; gap: 40px;
}
.footer-brand-col { max-width: 300px; }
.footer-brand-col .brand { margin-bottom: 16px; }
.footer-brand-col .wordmark { font-size: 13px; letter-spacing: .18em; color: var(--fg-2); }
.footer-brand-col .brand img { height: 26px; }
.footer-tagline { font-size: 13px; line-height: 1.6; color: var(--fg-muted); margin: 0; }
.footer-col h4 { font-size: 11.5px; letter-spacing: .08em; text-transform: uppercase; color: var(--fg-muted); margin: 0 0 16px; font-weight: 600; }
.footer-col a { display: block; font-size: 13.5px; color: var(--fg-2); text-decoration: none; margin-bottom: 11px; transition: color .15s; }
.footer-col a:last-child { margin-bottom: 0; }
.footer-col a:hover { color: var(--teal); }
.footer-bottom {
  max-width: 1240px; margin: 0 auto; padding: 20px 36px; border-top: 1px solid var(--border);
  display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap;
}
.footer-bottom .copy { font-size: 12px; color: var(--fg-muted); }
.footer-bottom .footer-meta { font-size: 12px; color: var(--fg-faint); }
@media (max-width: 760px) {
  .site-footer .footer-top { grid-template-columns: 1fr 1fr; gap: 32px; padding: 44px 24px 32px; }
  .footer-brand-col { grid-column: 1 / -1; max-width: none; }
  .footer-bottom { padding: 20px 24px; }
}

/* ── Section headings ───────────────────────────────────────────────── */
.eyebrow { font-size: 12px; font-weight: 700; letter-spacing: .14em; color: var(--teal); margin-bottom: 8px; }
h2.section { margin: 0; font-size: 30px; font-weight: 700; letter-spacing: -.01em; color: var(--fg); }

@media (max-width: 860px) {
  .arena-grid { grid-template-columns: 1fr; }
  .nav-links { display: none; }
  .container { padding: 0 20px; }
}