:root {
  --ink: #173c4b;
  --ink-soft: #4c6871;
  --paper: #fffaf0;
  --line: rgba(23, 60, 75, 0.16);
  --gold: #c87e1c;
  --gold-dark: #8b5012;
  --sky: #cfe8e9;
  --focus: #176a7c;
  --danger: #a64538;
  font-family: "Microsoft YaHei", "PingFang SC", system-ui, sans-serif;
  color: var(--ink);
  background: #dce9e8;
}

* { box-sizing: border-box; }

html, body { margin: 0; min-height: 100%; }

body {
  min-height: 100vh;
  display: grid;
  place-items: center;
  background:
    radial-gradient(circle at 50% 10%, rgba(255, 255, 255, 0.92), transparent 40%),
    #dce9e8;
  overflow: hidden;
}

button, input { font: inherit; }

button:focus-visible,
input:focus-visible,
canvas:focus-visible {
  outline: 4px solid rgba(23, 106, 124, 0.35);
  outline-offset: 3px;
}

.app-shell {
  width: min(100vw, calc(100vh * 1.6));
  aspect-ratio: 16 / 10;
  display: grid;
  grid-template-rows: 9% 91%;
  background: var(--paper);
  box-shadow: 0 16px 50px rgba(33, 68, 76, 0.18);
  overflow: hidden;
}

.game-toolbar {
  z-index: 10;
  display: grid;
  grid-template-columns: minmax(220px, 1fr) auto minmax(220px, 1fr);
  align-items: center;
  gap: 24px;
  padding: 0 28px;
  background: rgba(255, 250, 240, 0.98);
  border-bottom: 1px solid var(--line);
}

.brand-lockup { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  color: #fff;
  background: var(--ink);
  font-size: 23px;
}
.brand-lockup h1 { margin: 0; font-size: clamp(17px, 1.7vw, 25px); line-height: 1.05; letter-spacing: 0.04em; }
.brand-lockup p { margin: 4px 0 0; color: var(--ink-soft); font-size: clamp(10px, 0.9vw, 13px); }

.status-strip { display: flex; align-items: stretch; border: 1px solid var(--line); border-radius: 8px; overflow: hidden; }
.status-item { min-width: 90px; padding: 7px 18px; display: flex; align-items: baseline; justify-content: center; gap: 8px; border-right: 1px solid var(--line); }
.status-item:last-child { border-right: 0; }
.status-label { color: var(--ink-soft); font-size: 12px; }
.status-item strong { font-variant-numeric: tabular-nums; font-size: clamp(16px, 1.5vw, 22px); }
.score-item strong { color: var(--gold-dark); }

.icon-button {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 42px;
  padding: 0 18px;
  border: 1px solid var(--line);
  border-radius: 6px;
  color: var(--ink);
  background: transparent;
  cursor: pointer;
}
.icon-button:hover:not(:disabled) { background: rgba(23, 60, 75, 0.07); }
.icon-button:disabled { opacity: 0.4; cursor: default; }

.game-stage { position: relative; min-height: 0; overflow: hidden; background: var(--sky); touch-action: none; }
#game-canvas { display: block; width: 100%; height: 100%; }

.overlay-panel {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: grid;
  place-items: center;
  padding: 32px;
  background: rgba(15, 45, 55, 0.28);
  backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 180ms ease, visibility 180ms ease;
}
.overlay-panel--visible { opacity: 1; visibility: visible; }

.start-card,
.compact-card,
.result-card {
  width: min(92%, 560px);
  padding: clamp(26px, 3vw, 42px);
  background: rgba(255, 250, 240, 0.96);
  border: 1px solid rgba(255, 255, 255, 0.7);
  box-shadow: 0 20px 60px rgba(21, 46, 54, 0.24);
  text-align: center;
}
.result-card { width: min(92%, 680px); }
.eyebrow { margin: 0 0 8px; color: var(--gold-dark); font-size: 12px; font-weight: 700; letter-spacing: 0.14em; text-transform: uppercase; }
.start-card h2, .compact-card h2, .result-card h2 { margin: 0; font-family: Georgia, "Songti SC", serif; font-size: clamp(26px, 3vw, 42px); line-height: 1.2; font-weight: 600; }
.lead { margin: 16px auto 20px; max-width: 480px; color: var(--ink-soft); font-size: clamp(14px, 1.4vw, 18px); line-height: 1.7; }

.control-guide { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; margin: 20px 0; }
.control-guide > div { display: grid; grid-template-columns: auto 1fr; grid-template-rows: auto auto; column-gap: 12px; align-items: center; padding: 13px 16px; text-align: left; border: 1px solid var(--line); background: rgba(255,255,255,.45); }
.guide-icon { grid-row: 1 / 3; width: 38px; height: 38px; display: grid; place-items: center; border-radius: 50%; color: white; background: var(--ink); font-size: 22px; }
.control-guide strong { font-size: 16px; }
.control-guide small { color: var(--ink-soft); }

.seed-field { display: grid; grid-template-columns: 94px 1fr; align-items: center; gap: 8px 12px; margin: 20px 0; text-align: left; }
.seed-field > span { font-size: 14px; font-weight: 700; }
.seed-field input { width: 100%; min-height: 42px; padding: 8px 12px; border: 1px solid rgba(23,60,75,.25); border-radius: 4px; color: var(--ink); background: white; }
.seed-field small { grid-column: 2; color: var(--ink-soft); font-size: 12px; line-height: 1.5; }

.primary-button,
.secondary-button,
.text-button {
  min-height: 48px;
  padding: 0 24px;
  border-radius: 5px;
  font-weight: 700;
  cursor: pointer;
}
.primary-button { border: 1px solid var(--gold-dark); color: #fff; background: var(--gold-dark); }
.primary-button:hover { background: #6f3e0c; }
.secondary-button { border: 1px solid rgba(23,60,75,.3); color: var(--ink); background: transparent; }
.secondary-button:hover { background: rgba(23,60,75,.07); }
.text-button { border: 0; color: var(--ink); background: transparent; text-decoration: underline; text-underline-offset: 4px; }
.run-mode-note { margin: 12px 0 0; color: var(--ink-soft); font-size: 12px; }
.compact-card .primary-button { margin-top: 26px; }
.compact-card .secondary-button { margin: 12px 0 0; }

.countdown-panel { position: absolute; inset: 0; z-index: 30; display: none; place-items: center; color: white; background: rgba(17,54,67,.18); font-family: Georgia, serif; font-size: clamp(96px, 16vw, 210px); text-shadow: 0 5px 30px rgba(15,45,55,.35); }
.countdown-panel--visible { display: grid; }

.playtest-panel {
  position: absolute;
  top: 12px;
  right: 12px;
  z-index: 40;
  width: min(300px, calc(100% - 24px));
  color: var(--ink);
  background: rgba(255, 250, 240, 0.96);
  border: 1px solid rgba(23, 60, 75, 0.22);
  box-shadow: 0 12px 32px rgba(21, 46, 54, 0.2);
  backdrop-filter: blur(8px);
}

.playtest-toggle {
  width: 100%;
  min-height: 48px;
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 0;
  color: var(--ink);
  background: transparent;
  text-align: left;
  cursor: pointer;
}
.playtest-toggle > span:first-child { font-size: 13px; font-weight: 700; }
.playtest-toggle strong { color: var(--gold-dark); font-size: 12px; font-variant-numeric: tabular-nums; }
.playtest-chevron { font-size: 18px; transition: transform 160ms ease; }
.playtest-panel:not(.playtest-panel--collapsed) .playtest-chevron { transform: rotate(180deg); }

.playtest-controls {
  padding: 0 12px 12px;
  border-top: 1px solid var(--line);
}
.playtest-panel--collapsed .playtest-controls { display: none; }

.playtest-levels { min-width: 0; margin: 12px 0 0; padding: 0; border: 0; }
.playtest-levels legend { margin-bottom: 8px; color: var(--ink-soft); font-size: 12px; font-weight: 700; }
.level-switcher { display: grid; grid-template-columns: repeat(4, 1fr); gap: 4px; }
.level-switcher button {
  min-height: 34px;
  padding: 0 6px;
  border: 1px solid var(--line);
  border-radius: 4px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.5);
  font-size: 12px;
  cursor: pointer;
}
.level-switcher button[aria-pressed="true"] {
  border-color: var(--ink);
  color: #fff;
  background: var(--ink);
}
.playtest-levels p,
.playtest-footnote {
  margin: 8px 0 0;
  color: var(--ink-soft);
  font-size: 11px;
  line-height: 1.5;
}

.playtest-sliders { display: grid; gap: 7px; margin-top: 14px; }
.playtest-sliders label { display: flex; align-items: baseline; justify-content: space-between; gap: 8px; }
.playtest-sliders label span { font-size: 12px; font-weight: 700; }
.playtest-sliders label small { margin-left: 4px; color: var(--ink-soft); font-size: 10px; font-weight: 400; }
.playtest-sliders output { color: var(--gold-dark); font-size: 12px; font-weight: 800; font-variant-numeric: tabular-nums; }
.playtest-sliders input[type="range"] { width: 100%; margin: 0; accent-color: var(--gold-dark); cursor: pointer; }

.playtest-reset {
  width: 100%;
  min-height: 36px;
  margin-top: 14px;
  border: 1px solid rgba(23, 60, 75, 0.28);
  border-radius: 4px;
  color: var(--ink);
  background: transparent;
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}
.playtest-reset:hover { background: rgba(23, 60, 75, 0.07); }

.result-summary { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; margin: 28px 0 24px; background: var(--line); border: 1px solid var(--line); }
.result-summary > div { display: grid; gap: 6px; padding: 15px 10px; background: rgba(255,250,240,.98); }
.result-summary span { color: var(--ink-soft); font-size: 12px; }
.result-summary strong { font-size: clamp(17px, 2vw, 26px); font-variant-numeric: tabular-nums; }
.result-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 10px; }

.feedback-layer { position: absolute; inset: 0; pointer-events: none; z-index: 8; }
.score-pop { position: absolute; left: 29%; top: 42%; font-size: 34px; font-weight: 800; color: #fff; text-shadow: 0 2px 8px rgba(17,54,67,.55); animation: rise-and-fade 900ms ease-out forwards; }
.score-pop--coin { color: #ffe282; }
.score-pop--hit { color: #ffb8a8; }
.level-pop { position: absolute; top: 9%; left: 50%; transform: translateX(-50%); padding: 10px 22px; color: white; background: rgba(23,60,75,.86); font-size: 18px; font-weight: 700; animation: level-in 1200ms ease forwards; }

.hold-hint { position: absolute; left: 24px; bottom: 20px; z-index: 7; display: flex; align-items: center; gap: 8px; padding: 8px 12px; color: white; background: rgba(15,45,55,.55); font-size: 13px; pointer-events: none; }
.hold-hint span { width: 9px; height: 9px; border-radius: 50%; background: #ffd06a; box-shadow: 0 0 0 4px rgba(255,208,106,.22); }

.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }

@keyframes rise-and-fade { from { opacity: 0; transform: translateY(8px) scale(.9); } 25% { opacity: 1; } to { opacity: 0; transform: translateY(-62px) scale(1.06); } }
@keyframes level-in { 0%,100% { opacity: 0; transform: translate(-50%,-10px); } 18%,75% { opacity: 1; transform: translate(-50%,0); } }

@media (max-aspect-ratio: 4 / 3) {
  body { overflow: auto; place-items: start center; }
  .app-shell { width: 100vw; min-height: 0; aspect-ratio: auto; grid-template-rows: auto auto; }
  .game-toolbar { grid-template-columns: 1fr auto; padding: 10px 14px; gap: 10px; }
  .status-strip { grid-row: 2; grid-column: 1 / -1; width: 100%; }
  .status-item { flex: 1; min-width: 0; padding: 6px; }
  .icon-button { grid-column: 2; grid-row: 1; }
  .game-stage { min-height: 0; aspect-ratio: 1280 / 728; }
  .overlay-panel { position: fixed; overflow-y: auto; }
}

@media (max-width: 560px) {
  .brand-lockup p, .icon-button span:last-child { display: none; }
  .brand-mark { width: 34px; height: 34px; }
  .overlay-panel { padding: 14px; align-items: start; overflow-y: auto; }
  .start-card, .compact-card, .result-card { width: 100%; margin: 12px 0; padding: 22px 18px; }
  .control-guide { margin: 14px 0; }
  .seed-field { grid-template-columns: 1fr; }
  .seed-field small { grid-column: 1; }
  .result-summary { grid-template-columns: repeat(2, 1fr); }
  .playtest-panel { top: 8px; right: 8px; width: min(276px, calc(100% - 16px)); }
  .playtest-panel--collapsed { width: 190px; }
  .playtest-panel:not(.playtest-panel--collapsed) { position: fixed; top: 112px; max-height: calc(100vh - 120px); overflow-y: auto; }
}

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