:root {
  color-scheme: dark;
  --ink: #ecffff;
  --muted: #8dbac4;
  --aqua: #4dffe1;
  --cyan: #38cfff;
  --coral: #ff7b73;
  --deep: #020c17;
}
* { box-sizing: border-box; }
html, body { width: 100%; height: 100%; margin: 0; overflow: hidden; }
body {
  color: var(--ink);
  background: var(--deep);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}
button, a { font: inherit; }
#game-shell, #ocean { position: fixed; inset: 0; width: 100%; height: 100%; }
#ocean { touch-action: none; cursor: crosshair; }
.glass {
  border: 1px solid rgba(174, 242, 244, .18);
  background: linear-gradient(135deg, rgba(4, 31, 46, .84), rgba(2, 17, 31, .64));
  box-shadow: 0 24px 80px rgba(0, 4, 14, .35), inset 0 1px rgba(255,255,255,.08);
  backdrop-filter: blur(18px) saturate(1.2);
}
.hud {
  position: fixed; z-index: 6; top: max(16px, env(safe-area-inset-top)); left: 50%;
  width: min(920px, calc(100% - 32px)); height: 72px; transform: translateX(-50%);
  border-radius: 22px; padding: 10px 18px; display: grid; align-items: center;
  grid-template-columns: 1fr auto minmax(120px, 220px) auto auto; gap: 18px;
}
.mini-brand { color: inherit; text-decoration: none; display: flex; align-items: center; gap: 10px; font-weight: 900; letter-spacing: .14em; }
.mini-brand img { width: 48px; height: 48px; object-fit: contain; filter: drop-shadow(0 0 16px rgba(77,255,225,.35)); }
.stat { display: grid; line-height: 1; gap: 5px; min-width: 64px; }
.stat small { color: var(--muted); font-size: .62rem; font-weight: 800; letter-spacing: .18em; }
.stat strong { font-size: 1.05rem; font-variant-numeric: tabular-nums; }
.stat.score { text-align: right; min-width: 86px; }
.hud-buttons { display: flex; gap: 7px; }
.hud-buttons button {
  width: 40px; height: 40px; border-radius: 12px; border: 1px solid rgba(181,247,247,.15);
  background: rgba(255,255,255,.055); color: #d9ffff; font-weight: 900; cursor: pointer;
  transition: background .2s, transform .2s;
}
.hud-buttons button:hover { background: rgba(77,255,225,.14); transform: translateY(-2px); }
.hud-buttons button.muted { color: #6e9098; }
.growth { height: 8px; border-radius: 100px; background: rgba(255,255,255,.08); overflow: hidden; }
.growth span { display: block; width: 0; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--aqua), var(--cyan)); box-shadow: 0 0 14px var(--aqua); transition: width .25s ease; }
.start-screen { position: fixed; z-index: 10; inset: 0; display: grid; place-items: center; padding: clamp(16px, 3vh, 24px); background: radial-gradient(circle at 50% 58%, transparent, rgba(0,5,15,.44)); transition: opacity .55s ease, visibility .55s; }
.start-screen.hidden { opacity: 0; visibility: hidden; pointer-events: none; }
.intro-card { width: min(590px, 100%); max-height: calc(100dvh - 118px); overflow: auto; padding: clamp(18px, 3.5vh, 30px) clamp(20px, 4vw, 42px) clamp(22px, 4vh, 34px); border-radius: clamp(24px, 4vw, 34px); text-align: center; scrollbar-width: none; }
.intro-card::-webkit-scrollbar { display: none; }
.hero-mark { width: clamp(104px, min(18vw, 21vh), 180px); height: clamp(104px, min(18vw, 21vh), 180px); object-fit: contain; margin: -8px auto -5px; filter: drop-shadow(0 0 34px rgba(61,231,255,.28)); }
.eyebrow { color: var(--aqua); font-size: .68rem; font-weight: 900; letter-spacing: .24em; margin: 0 0 8px; }
h1 { margin: 0; font-size: clamp(2.7rem, min(7vw, 9.5vh), 5rem); line-height: .9; letter-spacing: -.068em; font-weight: 950; text-shadow: 0 8px 50px rgba(0,0,0,.42); white-space: nowrap; }
h1 span { color: var(--aqua); }
.tagline { margin: clamp(13px, 2.4vh, 20px) auto clamp(16px, 2.8vh, 24px); color: #b9d9df; font-size: clamp(.86rem, 1.8vw, 1.04rem); line-height: 1.55; }
#start-button { border: 0; border-radius: 999px; padding: 16px 28px; min-width: 190px; color: #03151c; font-weight: 950; letter-spacing: .08em; background: linear-gradient(115deg, #64ffe0, #62d6ff); box-shadow: 0 13px 36px rgba(64,224,239,.28); cursor: pointer; transition: transform .2s, filter .2s; }
#start-button:hover { transform: translateY(-3px) scale(1.025); filter: brightness(1.08); }
#start-button span { margin-left: 10px; }
.controls { margin-top: 22px; color: #7398a2; font-size: .7rem; letter-spacing: .06em; }
.controls b { color: #d7ffff; font-size: .65rem; }
.controls i { display: inline-block; width: 1px; height: 12px; margin: 0 10px -2px; background: rgba(255,255,255,.14); }
.best-line { margin: 14px 0 -5px; color: #6f98a1; font-size: .64rem; font-weight: 850; letter-spacing: .14em; }
.best-line b { color: #ccffff; margin-left: 7px; font-variant-numeric: tabular-nums; }
.hint { position: fixed; z-index: 7; left: 50%; bottom: max(22px, env(safe-area-inset-bottom)); transform: translateX(-50%) translateY(130px); padding: 12px 18px; border-radius: 14px; font-size: .76rem; color: var(--muted); transition: transform .45s ease; pointer-events: none; white-space: nowrap; }
.hint.show { transform: translateX(-50%) translateY(0); }
.hint b { color: var(--aqua); }.hint em { color: var(--coral); font-style: normal; }

.mission {
  position: fixed; z-index: 6; top: 106px; left: 20px; width: 218px; padding: 15px 16px;
  border-radius: 17px; transition: transform .45s ease, opacity .45s;
}
.mission small, .meter small, .high-score small { display: block; color: #719da7; font-size: .56rem; font-weight: 900; letter-spacing: .17em; }
.mission strong { display: block; margin: 7px 0 4px; font-size: .88rem; }
.mission span { display: block; color: #89b1b9; font-size: .68rem; }
.mission div { height: 5px; border-radius: 20px; background: rgba(255,255,255,.08); margin: 12px 0 7px; overflow: hidden; }
.mission i { display: block; height: 100%; width: 0; border-radius: inherit; background: linear-gradient(90deg, var(--aqua), var(--cyan)); transition: width .3s; }
.mission b { display: block; color: #d9ffff; text-align: right; font-size: .62rem; }
.danger {
  position: fixed; z-index: 7; top: 108px; left: 50%; transform: translate(-50%,-28px); opacity: 0;
  border-color: rgba(255,123,115,.38); color: #ffb3aa; padding: 9px 16px; border-radius: 999px;
  font-size: .61rem; font-weight: 950; letter-spacing: .16em; pointer-events: none; transition: .28s;
}
.danger.show { transform: translate(-50%,0); opacity: 1; animation: danger-pulse 1s infinite; }
@keyframes danger-pulse { 50% { box-shadow: 0 0 28px rgba(255,92,85,.24); } }
.combo { position: fixed; z-index: 7; top: 48%; left: 50%; translate: -50% -50%; text-align: center; opacity: 0; transform: scale(.7); pointer-events:none; transition: .22s; text-shadow: 0 6px 28px rgba(0,0,0,.55); }
.combo.show { opacity: 1; transform: scale(1); }
.combo strong { display:block; color: #ffef9b; font-size: clamp(2.4rem,7vw,5rem); line-height:.8; }
.combo span { color: #fff4bf; font-size:.62rem; font-weight:950; letter-spacing:.2em; }
.bottom-hud {
  position: fixed; z-index: 6; bottom: max(16px, env(safe-area-inset-bottom)); left: 50%; transform: translateX(-50%);
  width: min(640px, calc(100% - 32px)); min-height: 64px; padding: 11px 15px; border-radius: 19px;
  display: grid; align-items: center; grid-template-columns: auto 1fr auto; gap: 22px;
}
.meter.health strong { display:block; margin-top:5px; color: var(--coral); letter-spacing: .12em; font-size: .92rem; white-space:nowrap; }
.meter.health strong .lost { color: rgba(255,255,255,.13); }
.meter.surge { min-width: 0; }
.meter.surge > div { height: 8px; margin: 7px 0 4px; background: rgba(255,255,255,.08); border-radius: 20px; overflow:hidden; }
.meter.surge i { display:block; width:100%; height:100%; background: linear-gradient(90deg,#49ffe0,#36bfff); border-radius:inherit; box-shadow:0 0 12px rgba(77,255,225,.55); }
.meter.surge span { color:#719da7; font-size:.52rem; font-weight:800; letter-spacing:.09em; }
.high-score { text-align:right; }.high-score strong { display:block; margin-top:6px; font-size:.92rem; font-variant-numeric:tabular-nums; }
.modal-screen {
  position: fixed; z-index: 20; inset:0; display:grid; place-items:center; padding:22px;
  background:rgba(0,8,18,.55); backdrop-filter:blur(9px); opacity:0; visibility:hidden; pointer-events:none; transition:.28s;
}
.modal-screen.open { opacity:1; visibility:visible; pointer-events:auto; }
.modal-card { width:min(760px,100%); max-height:calc(100dvh - 32px); overflow:auto; border-radius:30px; padding:32px; text-align:center; transform:translateY(18px) scale(.97); transition:.3s; scrollbar-width:thin; scrollbar-color:rgba(77,255,225,.35) transparent; }
.modal-screen.open .modal-card { transform:none; }
.modal-card h2 { margin:3px 0 7px; font-size:clamp(2rem,5vw,3.4rem); letter-spacing:-.05em; }
.modal-card > p:not(.eyebrow):not(.new-best) { color:#8fb5bd; margin:0 0 24px; }
.upgrade-grid { display:grid; grid-template-columns:repeat(3,1fr); gap:12px; }
.upgrade {
  border:1px solid rgba(174,242,244,.17); border-radius:20px; min-height:178px; padding:18px 15px;
  color:var(--ink); background:rgba(255,255,255,.04); text-align:left; cursor:pointer; transition:.25s;
}
.upgrade:hover { transform:translateY(-5px); border-color:rgba(77,255,225,.55); background:rgba(77,255,225,.09); box-shadow:0 20px 40px rgba(0,10,25,.35); }
.upgrade .upgrade-icon { display:grid; place-items:center; width:42px;height:42px;border-radius:13px;background:rgba(77,255,225,.11);color:var(--aqua);font-size:1.25rem;margin-bottom:18px; }
.upgrade strong { display:block; font-size:.94rem; margin-bottom:7px; }.upgrade span { display:block;color:#8db1b9;font-size:.73rem;line-height:1.45; }
.compact-card { width:min(430px,100%); }.compact-card a { display:block;margin-top:18px;color:#7faab4;text-decoration:none;font-size:.75rem; }
.primary-button { border:0;border-radius:999px;padding:15px 25px;background:linear-gradient(110deg,var(--aqua),var(--cyan));color:#031720;font-weight:950;letter-spacing:.08em;cursor:pointer;box-shadow:0 12px 30px rgba(55,223,234,.22); }
.run-stats { display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin:24px 0 18px; }
.run-stats div { padding:16px 8px;border-radius:16px;background:rgba(255,255,255,.045);border:1px solid rgba(255,255,255,.08); }
.run-stats small { display:block;color:#719da7;font-size:.55rem;font-weight:900;letter-spacing:.13em; }.run-stats strong { display:block;font-size:1.25rem;margin-top:7px; }
.new-best { color:#ffef9b;margin:0 0 18px;font-size:.65rem;font-weight:950;letter-spacing:.18em; }
.new-best.hidden { visibility:hidden; }
.toast { position:fixed;z-index:25;left:50%;top:21%;translate:-50% 0;min-width:230px;padding:13px 24px;border-radius:16px;text-align:center;background:rgba(3,22,35,.88);border:1px solid rgba(77,255,225,.3);box-shadow:0 18px 60px rgba(0,0,0,.4);opacity:0;transform:translateY(-18px);transition:.35s;pointer-events:none; }
.toast.show { opacity:1;transform:none; }.toast small { display:block;color:var(--aqua);font-size:.55rem;font-weight:900;letter-spacing:.19em; }.toast strong { display:block;margin-top:4px;font-size:.92rem; }
body.menu-state .mission,
body.menu-state .bottom-hud,
body.menu-state .danger,
body.menu-state .combo { opacity: 0 !important; visibility: hidden; pointer-events: none; }
body.menu-state .hud { width: min(520px, calc(100% - 32px)); grid-template-columns: 1fr auto; }
body.menu-state .hud > .stat,
body.menu-state .hud > .growth,
body.menu-state #pause-button { display: none; }
body.menu-state .hud-buttons { justify-self: end; }
@media (max-width: 650px) {
  .hud { height: 62px; padding: 8px 10px; grid-template-columns: auto auto 1fr auto auto; gap: 8px; border-radius: 18px; }
  .mini-brand img { width: 40px; height: 40px; }.mini-brand span { display: none; }
  .hud-buttons button { width:34px;height:34px;border-radius:10px; }.hud-buttons { gap:4px; }
  .stat.score { min-width:60px; }.stat strong { font-size:.88rem; }.stat small { font-size:.48rem; }
  .intro-card { padding: 24px 20px 28px; border-radius: 26px; }
  .controls { line-height: 1.8; }.controls i { display: none; }
  .hint { max-width: calc(100% - 28px); white-space: normal; text-align: center; }
  .mission { top:88px;left:12px;width:184px;padding:12px 13px; }
  .danger { top:88px; }
  .bottom-hud { bottom:max(10px,env(safe-area-inset-bottom));grid-template-columns:auto 1fr;gap:14px;padding:9px 12px;min-height:58px; }
  .high-score { display:none; }.meter.surge span { display:none; }
  .upgrade-grid { grid-template-columns:1fr; }.upgrade { min-height:0;display:grid;grid-template-columns:auto 1fr;column-gap:13px;align-items:center; }.upgrade .upgrade-icon { grid-row:1/3;margin:0; }.upgrade strong,.upgrade span { grid-column:2; }
  .modal-card { padding:25px 18px;max-height:calc(100vh - 28px);overflow:auto; }.evolution-card h2 { font-size:2rem; }
}
@media (max-height: 650px) {
  .hero-mark { width:96px;height:96px; }.intro-card { padding-top:14px; }.tagline { margin:10px auto 13px; }.controls { margin-top:10px; }.best-line { margin-top:10px; }
  .mission { top:88px; }.bottom-hud { min-height:55px; }.modal-card { max-height:94vh;overflow:auto; }
}
@media (max-height: 540px) {
  body.menu-state .hud { display:none; }
  .start-screen { padding:12px; }
  .hero-mark { width:72px;height:72px; }.eyebrow { font-size:.58rem; }.intro-card { max-height:calc(100dvh - 24px);padding-block:12px; }.controls { display:none; }
  #start-button { padding:12px 24px; }
}