:root {
  --bg: #04070d;
  --bg-soft: #070d16;
  --ink: #d9f7ff;
  --ink-dim: #82a6b2;
  --cyan: #6ff7ff;
  --cyan-strong: #b8fdff;
  --cyan-deep: #1b7c8a;
  --amber: #ffcf7a;
  --red: #ff5f78;
  --violet: #a99bff;
  --line: rgba(111, 247, 255, .18);
  --line-strong: rgba(111, 247, 255, .42);
  --panel: rgba(5, 11, 18, .78);
  --sans: ui-sans-serif, system-ui, -apple-system, "Segoe UI", "Microsoft YaHei", "PingFang SC", sans-serif;
  --mono: ui-monospace, "Cascadia Code", "SFMono-Regular", Consolas, monospace;
}

* { box-sizing: border-box; }

html, body {
  height: 100%;
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
  overscroll-behavior: none;
}

body {
  overflow: hidden;
  touch-action: none;
  user-select: none;
  -webkit-user-select: none;
  -webkit-tap-highlight-color: transparent;
}

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

.stage {
  position: fixed;
  inset: 0;
  overflow: hidden;
  background: #04070d;
}

#game {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: block;
  touch-action: none;
  cursor: crosshair;
}

/* ---------- atmosphere overlays ---------- */
.fx {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 2;
}
.fx-vignette {
  background:
    radial-gradient(ellipse at 50% 45%, transparent 38%, rgba(0, 0, 0, .42) 82%, rgba(0, 0, 0, .82) 100%),
    linear-gradient(180deg, rgba(2, 5, 10, .42), transparent 18%, transparent 80%, rgba(2, 5, 10, .55));
}
.fx-scan {
  opacity: .16;
  background: repeating-linear-gradient(0deg, transparent 0 2px, rgba(130, 240, 255, .035) 2px 3px);
  mix-blend-mode: screen;
  animation: scan 9s linear infinite;
}
@keyframes scan { from { background-position-y: 0; } to { background-position-y: 90px; } }

/* ---------- HUD ---------- */
.hud {
  position: absolute;
  z-index: 12;
  top: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  padding: max(18px, env(safe-area-inset-top)) 24px 18px;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(3, 6, 12, .72), transparent);
  transform: translateY(-14px);
  opacity: 0;
  transition: opacity .35s ease, transform .35s ease;
}
body.in-play .hud { opacity: 1; transform: none; }

.hud-left { display: flex; flex-direction: column; gap: 2px; min-width: 0; }
.hud-center { display: flex; flex-direction: column; align-items: center; gap: 2px; }
.hud-right { display: flex; align-items: center; gap: 8px; pointer-events: auto; }
.hud-kicker {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--ink-dim);
  text-transform: uppercase;
  white-space: nowrap;
}
.hud-title {
  font-size: 20px;
  font-weight: 650;
  letter-spacing: .1em;
  color: var(--cyan-strong);
  text-shadow: 0 0 18px rgba(111, 247, 255, .45);
}
.hud-cores {
  font-family: var(--mono);
  font-size: 17px;
  letter-spacing: .14em;
  color: var(--amber);
  text-shadow: 0 0 14px rgba(255, 207, 122, .4);
}
.hud-time {
  font-family: var(--mono);
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--ink-dim);
  padding-right: 2px;
}
.icon-btn {
  width: 34px;
  height: 34px;
  border-radius: 50%;
  border: 1px solid var(--line);
  background: rgba(6, 14, 22, .55);
  color: var(--ink-dim);
  font-family: var(--mono);
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  transition: border-color .2s, color .2s, background .2s;
  backdrop-filter: blur(6px);
}
.icon-btn:hover, .icon-btn:focus-visible { border-color: var(--line-strong); color: var(--cyan); }
.icon-btn.is-off { color: #52636b; text-decoration: line-through; }

/* ---------- intro / toast ---------- */
.intro {
  position: absolute;
  z-index: 10;
  top: 20%;
  left: 0;
  right: 0;
  text-align: center;
  pointer-events: none;
  opacity: 0;
  transform: translateY(10px);
  transition: opacity .5s ease, transform .5s ease;
}
.intro.on { opacity: 1; transform: none; }
.intro-kicker {
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .36em;
  color: var(--cyan-deep);
}
.intro-name {
  margin: 0;
  font-size: clamp(30px, 5vw, 48px);
  font-weight: 700;
  letter-spacing: .24em;
  color: var(--cyan-strong);
  text-shadow: 0 0 32px rgba(111, 247, 255, .4);
}
.intro-hint {
  margin: 12px auto 0;
  max-width: 520px;
  padding: 0 24px;
  font-size: 13px;
  line-height: 1.8;
  letter-spacing: .08em;
  color: var(--ink-dim);
}

.toast {
  position: absolute;
  z-index: 14;
  left: 50%;
  bottom: 12%;
  transform: translate(-50%, 8px);
  padding: 9px 18px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(4, 10, 17, .82);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: .14em;
  opacity: 0;
  pointer-events: none;
  transition: opacity .25s ease, transform .25s ease;
  backdrop-filter: blur(8px);
  white-space: nowrap;
}
.toast.on { opacity: 1; transform: translate(-50%, 0); }

/* ---------- screens ---------- */
.screen {
  position: absolute;
  inset: 0;
  z-index: 20;
  display: none;
  align-items: center;
  justify-content: center;
  padding: max(24px, env(safe-area-inset-top)) 24px max(24px, env(safe-area-inset-bottom));
  overflow-y: auto;
  background:
    radial-gradient(ellipse at 50% 42%, rgba(6, 16, 26, .35), rgba(3, 6, 12, .82) 58%, rgba(2, 4, 8, .94)),
    linear-gradient(180deg, rgba(3, 6, 12, .3), rgba(3, 6, 12, .65));
  backdrop-filter: blur(3px);
  opacity: 1;
}
.screen.on { display: flex; }
.screen.on .panel { animation: panelin .24s ease; }
@keyframes panelin {
  from { transform: translateY(7px); opacity: .35; }
  to { transform: none; opacity: 1; }
}

.screen-title { background: radial-gradient(ellipse at 50% 45%, rgba(7, 20, 31, .18), rgba(3, 6, 12, .74) 62%, rgba(2, 4, 8, .93)); }
.title-wrap {
  width: min(460px, 100%);
  text-align: center;
  padding: 12px 0 4px;
}
.eyebrow {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .32em;
  color: var(--cyan-deep);
  text-transform: uppercase;
}
.eyebrow.red { color: var(--red); }
.logo {
  margin: 0;
  display: flex;
  align-items: baseline;
  justify-content: center;
  gap: 18px;
  line-height: 1;
}
.logo-cn {
  font-size: clamp(64px, 13vw, 96px);
  font-weight: 800;
  letter-spacing: .12em;
  color: var(--cyan-strong);
  text-shadow: 0 0 26px rgba(111, 247, 255, .5), 0 0 90px rgba(45, 180, 200, .28);
}
.logo-en {
  font-family: var(--mono);
  font-size: clamp(11px, 2vw, 15px);
  letter-spacing: .5em;
  color: var(--ink-dim);
  writing-mode: vertical-rl;
  transform: translateY(-4px);
}
.tagline {
  margin: 22px 0 30px;
  font-size: 13px;
  letter-spacing: .28em;
  color: var(--ink-dim);
}
.save-line {
  min-height: 18px;
  margin: 20px 0 0;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .16em;
  color: var(--cyan-deep);
}
.controls-line {
  margin: 10px 0 0;
  font-size: 10px;
  letter-spacing: .12em;
  color: #4d626b;
  line-height: 1.8;
}

.menu {
  display: flex;
  flex-direction: column;
  gap: 9px;
  width: min(300px, 100%);
  margin: 0 auto;
}
.btn {
  appearance: none;
  width: 100%;
  padding: 13px 20px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(6, 15, 23, .6);
  color: var(--ink);
  font-size: 13px;
  letter-spacing: .2em;
  cursor: pointer;
  transition: border-color .2s ease, background .2s ease, color .2s ease, box-shadow .2s ease;
  backdrop-filter: blur(8px);
}
.btn:hover, .btn:focus-visible {
  border-color: var(--line-strong);
  background: rgba(9, 23, 34, .8);
  color: var(--cyan-strong);
  box-shadow: 0 0 24px rgba(111, 247, 255, .08) inset, 0 0 18px rgba(111, 247, 255, .06);
  outline: none;
}
.btn-primary {
  border-color: rgba(111, 247, 255, .55);
  background: linear-gradient(180deg, rgba(111, 247, 255, .18), rgba(111, 247, 255, .08));
  color: var(--cyan-strong);
  box-shadow: 0 0 28px rgba(111, 247, 255, .12);
}
.btn-primary:hover { background: linear-gradient(180deg, rgba(111, 247, 255, .3), rgba(111, 247, 255, .12)); }
.btn-ghost { border-color: transparent; background: transparent; color: var(--ink-dim); }
.btn-ghost:hover { border-color: var(--line); background: rgba(8, 18, 27, .5); }
.btn-danger { width: auto; border-color: rgba(255, 95, 120, .35); color: var(--red); padding: 9px 16px; font-size: 11px; }
.btn-danger:hover { border-color: rgba(255, 95, 120, .7); color: #ffb3c0; background: rgba(255, 95, 120, .08); }

.panel {
  width: min(760px, 100%);
  padding: 30px 32px;
  border: 1px solid var(--line);
  border-radius: 4px;
  background: var(--panel);
  box-shadow: 0 30px 90px rgba(0, 0, 0, .55), 0 0 0 1px rgba(255, 255, 255, .02) inset;
  backdrop-filter: blur(14px);
}
.panel-narrow { width: min(430px, 100%); }
.panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 24px;
}
.panel-head h2 {
  margin: 0;
  font-size: 24px;
  font-weight: 650;
  letter-spacing: .16em;
  color: var(--cyan-strong);
}
.panel-head .btn { width: auto; padding: 8px 16px; font-size: 11px; }
.panel-foot {
  margin: 18px 0 0;
  font-size: 11px;
  line-height: 1.9;
  letter-spacing: .06em;
  color: #617780;
}

.level-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 10px;
}
.level-card {
  appearance: none;
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding: 14px 14px 12px;
  border: 1px solid var(--line);
  border-radius: 3px;
  background: rgba(7, 16, 25, .6);
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: border-color .2s, background .2s, transform .15s;
}
.level-card:hover:not(:disabled) { border-color: var(--line-strong); background: rgba(10, 25, 37, .8); transform: translateY(-1px); }
.level-card:disabled { cursor: not-allowed; opacity: .32; }
.level-num {
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: .22em;
  color: var(--cyan-deep);
}
.level-card b { font-size: 15px; font-weight: 600; letter-spacing: .12em; color: var(--cyan-strong); }
.level-card small { font-family: var(--mono); font-size: 10px; letter-spacing: .1em; color: #597079; }
.level-card .lock { position: absolute; right: 12px; top: 12px; font-size: 11px; color: #4d626b; }

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 15px 0;
  border-top: 1px solid rgba(255, 255, 255, .045);
  font-size: 13px;
  letter-spacing: .06em;
}
.row:first-of-type { border-top: 0; }
.row span { display: flex; flex-direction: column; gap: 4px; }
.row small { font-size: 10px; letter-spacing: .04em; color: #5a7079; }
.row input[type=range] { width: 120px; accent-color: var(--cyan); }
.row output { width: 28px; text-align: right; font-family: var(--mono); font-size: 11px; color: var(--cyan); }
.row input[type=checkbox] { width: 17px; height: 17px; accent-color: var(--cyan); }
.row-check { cursor: pointer; }

.stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 22px 0 24px;
}
.stats > div {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  padding: 14px 8px;
  border: 1px solid rgba(255, 255, 255, .05);
  background: rgba(4, 10, 16, .4);
}
.stats span { font-family: var(--mono); font-size: 9px; letter-spacing: .2em; color: #5a7079; }
.stats b { font-family: var(--mono); font-size: 17px; font-weight: 500; letter-spacing: .08em; color: var(--cyan-strong); }
.win-title { margin: 0 0 4px; font-size: 30px; letter-spacing: .2em; color: var(--cyan-strong); text-shadow: 0 0 30px rgba(111, 247, 255, .3); }
.dead-title { margin: 0 0 4px; font-size: 30px; letter-spacing: .2em; color: #ffb3c0; text-shadow: 0 0 30px rgba(255, 95, 120, .3); }
.dead-panel { border-color: rgba(255, 95, 120, .24); box-shadow: 0 30px 90px rgba(0, 0, 0, .6), 0 0 40px rgba(255, 95, 120, .05) inset; }
.auto-line { min-height: 16px; margin: 14px 0 0; text-align: center; font-family: var(--mono); font-size: 10px; letter-spacing: .16em; color: #6e5960; }
.screen.is-dead { animation: glitch .36s steps(2) 1; }
@keyframes glitch {
  0% { transform: translate(0); filter: none; }
  20% { transform: translate(-6px, 2px); filter: hue-rotate(18deg); }
  40% { transform: translate(5px, -2px); }
  60% { transform: translate(-2px, 1px); }
  100% { transform: translate(0); filter: none; }
}

/* ---------- touch ---------- */
.touch { display: none; }
body.touch-ui.in-play .touch.on { display: block; }
.stick {
  position: absolute;
  z-index: 11;
  width: 118px;
  height: 118px;
  margin: -59px 0 0 -59px;
  border: 1px solid rgba(111, 247, 255, .22);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(111, 247, 255, .055), transparent 70%);
  opacity: 0;
  pointer-events: none;
  transition: opacity .15s;
}
.stick.on { opacity: 1; }
.stick-knob {
  position: absolute;
  left: 50%;
  top: 50%;
  width: 48px;
  height: 48px;
  margin: -24px 0 0 -24px;
  border: 1px solid rgba(111, 247, 255, .45);
  border-radius: 50%;
  background: rgba(111, 247, 255, .12);
  box-shadow: 0 0 22px rgba(111, 247, 255, .18);
}
.pulse-btn {
  position: absolute;
  z-index: 12;
  right: max(20px, env(safe-area-inset-right));
  bottom: max(34px, env(safe-area-inset-bottom));
  width: 86px;
  height: 86px;
  border: 1px solid rgba(111, 247, 255, .5);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(111, 247, 255, .2), rgba(6, 15, 23, .72));
  color: var(--cyan-strong);
  font-size: 13px;
  letter-spacing: .18em;
  box-shadow: 0 0 32px rgba(111, 247, 255, .16);
  touch-action: none;
}
.pulse-btn:active { background: radial-gradient(circle, rgba(111, 247, 255, .38), rgba(6, 15, 23, .8)); }
.touch-hint {
  position: absolute;
  z-index: 10;
  left: max(24px, env(safe-area-inset-left));
  bottom: max(16px, env(safe-area-inset-bottom));
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: .18em;
  color: #4d626b;
}

.noscript {
  position: fixed;
  inset: 0;
  z-index: 99;
  display: grid;
  place-items: center;
  padding: 2em;
  background: #04070d;
  color: #d9f7ff;
  font: 15px/1.8 var(--sans);
  text-align: center;
}

/* ---------- reduced motion ---------- */
body.reduced-motion .fx-scan { animation: none; opacity: .05; }
body.reduced-motion .screen { animation: none; opacity: 1; }
body.reduced-motion .screen.is-dead { animation: none; }
body.reduced-motion .intro, body.reduced-motion .toast, body.reduced-motion .hud { transition: none; }
@media (prefers-reduced-motion: reduce) {
  .fx-scan { animation: none; opacity: .05; }
}

/* ---------- narrow screens ---------- */
@media (max-width: 640px) {
  .hud { padding: max(14px, env(safe-area-inset-top)) 16px 12px; gap: 8px; }
  .hud-title { font-size: 17px; }
  .hud-kicker { font-size: 9px; }
  .hud-center .hud-kicker { display: none; }
  .hud-cores { font-size: 14px; }
  .hud-time { font-size: 12px; }
  .icon-btn { width: 31px; height: 31px; }
  .panel { padding: 24px 20px; }
  .panel-head h2 { font-size: 21px; }
  .level-grid { grid-template-columns: repeat(2, 1fr); }
  .stats { grid-template-columns: repeat(3, 1fr); }
  .stats b { font-size: 15px; }
  .title-wrap { padding-top: 4vh; }
  .tagline { margin: 18px 0 24px; }
  .controls-line { font-size: 9px; }
  .screen { padding-left: 16px; padding-right: 16px; }
  .row input[type=range] { width: 100px; }
}

@media (max-height: 620px) and (orientation: landscape) {
  .title-wrap { transform: scale(.9); }
  .tagline { margin: 12px 0 18px; }
  .menu { gap: 6px; }
  .btn { padding: 10px 16px; }
  .logo-cn { font-size: 56px; }
}