/* Design tokens + theme palettes live in /css/themes.css (shared site-wide).
   Liquid colours are fixed in palette.js, not theme tokens. */

* { box-sizing: border-box; -webkit-tap-highlight-color: transparent; }
[hidden] { display: none !important; }
html, body { margin: 0; height: 100%; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1100px 700px at 80% -10%, color-mix(in srgb, var(--accent) 18%, transparent), transparent 60%),
    radial-gradient(900px 600px at 0% 110%, color-mix(in srgb, var(--accent-2) 16%, transparent), transparent 55%),
    var(--bg);
  overflow: hidden; user-select: none; -webkit-user-select: none; touch-action: manipulation;
}
#app { height: 100%; position: relative; }
#stage { position: fixed; inset: 0; width: 100%; height: 100%; display: block; touch-action: none; }
.screen { position: absolute; inset: 0; padding: calc(var(--safe-top) + 14px) 16px calc(var(--safe-bottom) + 14px);
  display: flex; flex-direction: column; overflow: hidden; animation: fadeIn 0.28s ease both; }
@keyframes fadeIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }
#screen-game { pointer-events: none; justify-content: space-between; }
#screen-game > * { pointer-events: auto; }

/* Buttons */
button { font-family: inherit; cursor: pointer; border: none; color: var(--text); }
button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn-primary { background: linear-gradient(135deg, var(--accent), var(--accent-2)); color: #fff;
  font-size: 1.15rem; font-weight: 700; padding: 16px; border-radius: 14px; width: 100%;
  box-shadow: 0 10px 30px color-mix(in srgb, var(--accent) 35%, transparent); transition: transform 0.12s ease, opacity 0.15s ease; }
.btn-primary:active { transform: scale(0.97); }
.btn-ghost { background: transparent; border: 1px solid var(--card-border); color: var(--muted);
  padding: 10px 14px; border-radius: 12px; font-size: 0.9rem; font-weight: 600; }
.btn-ghost:active { background: rgba(255,255,255,0.05); }

/* Setup */
.setup-wrap { max-width: 460px; width: 100%; margin: auto; display: flex; flex-direction: column; gap: 16px; }
.back-link { align-self: flex-start; color: var(--muted); text-decoration: none; font-size: 0.9rem; font-weight: 600; padding: 4px 2px; }
.back-link:active { color: var(--text); }
.brand { text-align: center; padding: 4px 0; }
.brand-mark { font-size: 3rem; line-height: 1; display: inline-block; animation: tip 3.2s ease-in-out infinite;
  filter: drop-shadow(0 6px 14px color-mix(in srgb, var(--accent) 50%, transparent)); }
@keyframes tip { 0%, 60%, 100% { transform: rotate(0); } 75% { transform: rotate(-24deg) translateY(-4px); } }
.brand h1 { font-size: 2.6rem; margin: 6px 0 0; letter-spacing: -1px; font-weight: 800; }
.tagline { color: var(--muted); margin: 2px 0 0; font-size: 0.95rem; }
.card { background: var(--card); border: 1px solid var(--card-border); border-radius: var(--radius);
  padding: 16px; backdrop-filter: blur(12px); -webkit-backdrop-filter: blur(12px); }
.card h2 { margin: 0 0 12px; font-size: 1.05rem; }
.hint { color: var(--muted); font-size: 0.85rem; margin: 12px 2px 0; text-align: center; line-height: 1.45; }
.diff-grid { display: flex; flex-direction: column; gap: 10px; }
.diff-opt { display: flex; align-items: baseline; justify-content: space-between; gap: 10px;
  padding: 14px 16px; border-radius: 14px; text-align: left;
  background: rgba(255,255,255,0.06); border: 1px solid var(--card-border); color: var(--text);
  transition: background 0.15s ease, border-color 0.15s ease, transform 0.1s ease; }
.diff-opt .d-name { font-size: 1.1rem; font-weight: 800; }
.diff-opt small { color: var(--muted); font-size: 0.82rem; text-align: right; }
.diff-opt.active { background: color-mix(in srgb, var(--accent) 22%, transparent); border-color: var(--accent); }
.diff-opt:active { transform: scale(0.98); }

/* Game */
.game-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; width: 100%; max-width: 600px; margin-inline: auto; }
.len-pill { font-size: 0.85rem; color: var(--muted); background: var(--card); border: 1px solid var(--card-border);
  padding: 6px 12px; border-radius: 999px; white-space: nowrap; }
.len-pill #level-name { color: var(--text); font-weight: 700; }
.btn-menu { padding: 12px 13px; font-size: 1.2rem; line-height: 1; letter-spacing: 1px; background: var(--card); }

.tools { display: flex; justify-content: center; gap: 12px; width: 100%; max-width: 420px; margin-inline: auto; }
.tool { position: relative; flex: 1 1 0; display: flex; align-items: center; justify-content: center; gap: 8px;
  padding: 13px 14px; border-radius: 14px; font-weight: 700; font-size: 1rem;
  background: var(--card); border: 1px solid var(--card-border); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px);
  transition: opacity 0.15s ease, transform 0.1s ease; }
.tool:active { transform: scale(0.97); }
.tool:disabled { opacity: 0.4; }
.tool .t-icon { font-size: 1.15rem; line-height: 1; }
.tool .badge { min-width: 22px; padding: 2px 7px; border-radius: 999px; font-size: 0.78rem; font-weight: 800;
  background: color-mix(in srgb, var(--accent) 35%, transparent); border: 1px solid var(--accent); font-variant-numeric: tabular-nums; }
.tool.thinking .t-icon { animation: think 0.8s ease-in-out infinite; }
@keyframes think { 50% { transform: scale(1.25); filter: drop-shadow(0 0 8px var(--gold)); } }

.toast { position: absolute; top: calc(var(--safe-top) + 64px); left: 50%; transform: translateX(-50%);
  background: var(--text); color: var(--bg); font-weight: 700; font-size: 0.85rem;
  padding: 9px 16px; border-radius: 10px; opacity: 0; transition: opacity 0.2s ease; pointer-events: none; z-index: 15; white-space: nowrap; }
.toast.show { opacity: 0.96; }

/* Overlays */
.overlay { position: fixed; inset: 0; z-index: 20; display: flex; align-items: flex-end;
  background: rgba(4,7,15,0); transition: background 0.22s ease; }
.overlay.open { background: rgba(4,7,15,0.6); backdrop-filter: blur(3px); }
#result-overlay.open { background: rgba(4,7,15,0.35); backdrop-filter: none; }
.sheet { width: 100%; max-height: 92%; background: var(--bg-2); border-top-left-radius: 24px; border-top-right-radius: 24px;
  padding: 12px 18px calc(var(--safe-bottom) + 18px); border-top: 1px solid var(--card-border);
  transform: translateY(100%); transition: transform 0.3s cubic-bezier(0.2,0.9,0.2,1.05);
  display: flex; flex-direction: column; overflow-y: auto; text-align: center; }
.overlay.open .sheet { transform: translateY(0); }
.sheet::before { content: ''; display: block; width: 40px; height: 4px; border-radius: 3px; background: var(--muted); opacity: 0.5; margin: 2px auto 10px; }
.sheet-head { display: flex; justify-content: space-between; align-items: baseline; }
.sheet-head h2 { margin: 0; font-size: 1.3rem; }
.sheet h2 { margin: 4px 0 0; font-size: 1.8rem; }
.menu-actions { display: flex; flex-direction: column; gap: 10px; margin: 14px 0; }
.menu-item { display: grid; grid-template-columns: auto 1fr; align-items: center; gap: 2px 14px;
  text-align: left; background: rgba(255,255,255,0.05); border: 1px solid var(--card-border);
  border-radius: 14px; padding: 14px; color: var(--text); transition: transform 0.1s ease, background 0.15s ease; }
.menu-item:active { transform: scale(0.98); background: rgba(255,255,255,0.09); }
.menu-item .m-icon { grid-row: 1 / 3; font-size: 1.6rem; }
.menu-item .m-title { font-weight: 700; font-size: 1.05rem; }
.menu-item small { color: var(--muted); font-size: 0.8rem; }
.result-emoji { font-size: 3.4rem; animation: bounce 0.5s cubic-bezier(0.2,1.4,0.4,1) both; }
@keyframes bounce { from { transform: scale(0); } to { transform: scale(1); } }
.result-sub { color: var(--muted); margin: 4px 0 14px; font-size: 0.92rem; }
.sheet-actions { display: flex; gap: 10px; }
.sheet-actions .btn-ghost, .sheet-actions .btn-primary { width: auto; flex: 1; }

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