:root {
  color-scheme: dark;
  --bg: #06101d;
  --panel: rgba(11, 24, 42, 0.88);
  --panel-strong: #102843;
  --line: rgba(151, 190, 221, 0.16);
  --text: #eef7ff;
  --muted: #7f9ab3;
  --cyan: #61e5ff;
  --cyan-soft: rgba(97, 229, 255, 0.17);
  --amber: #ffc46b;
  --coral: #ff7a7a;
  --green: #86f2b4;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-width: 320px;
  min-height: 100vh;
  overflow-x: hidden;
  background: var(--bg);
  color: var(--text);
}

body::before {
  position: fixed;
  inset: 0;
  z-index: -1;
  content: "";
  background: radial-gradient(circle at 50% -12%, rgba(32, 91, 138, 0.28), transparent 42%), linear-gradient(180deg, #081727 0%, #06101d 75%);
}

button { font: inherit; }
button:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; }

.game-shell { width: min(1500px, 100%); margin: 0 auto; padding: 24px clamp(16px, 3vw, 48px) 36px; }
.topbar { display: flex; align-items: center; justify-content: space-between; gap: 24px; margin-bottom: 20px; }
.brand-lockup, .run-stats, .point-bank, .arena-meta, .arena-footer { display: flex; align-items: center; }
.brand-lockup { gap: 12px; }
.brand-mark { display: grid; place-items: center; width: 42px; height: 42px; border: 1px solid rgba(97,229,255,.38); border-radius: 12px; color: var(--cyan); font-family: "SFMono-Regular", Consolas, monospace; font-size: 13px; box-shadow: 0 0 28px rgba(97,229,255,.12); }
.eyebrow { margin: 0 0 4px; color: var(--muted); font-size: 10px; font-weight: 700; letter-spacing: .16em; text-transform: uppercase; }
h1, h2, p { margin-top: 0; }
h1 { margin-bottom: 0; font-size: 22px; letter-spacing: -.04em; }
h2 { margin: 0; font-size: 17px; letter-spacing: -.03em; }
.run-stats { gap: 8px; }
.stat-chip { min-width: 92px; padding: 9px 12px; border: 1px solid var(--line); border-radius: 12px; background: rgba(14, 31, 53, .62); }
.stat-chip span, .stat-chip strong { display: block; }
.stat-chip span { margin-bottom: 4px; color: var(--muted); font-size: 10px; text-transform: uppercase; letter-spacing: .13em; }
.stat-chip strong { font-size: 15px; font-family: "SFMono-Regular", Consolas, monospace; }
.play-layout { position: relative; display: grid; grid-template-columns: minmax(0, 1fr); align-items: start; }
.arena-frame { position: relative; min-height: min(76vh, 820px); overflow: hidden; border: 1px solid var(--line); border-radius: 20px; background: linear-gradient(180deg, rgba(11, 28, 48, .72), rgba(4, 13, 25, .96)); box-shadow: 0 24px 80px rgba(0, 0, 0, .26), inset 0 1px rgba(255,255,255,.03); }
.arena-frame::after { position: absolute; inset: 0; pointer-events: none; content: ""; background: linear-gradient(90deg, rgba(97,229,255,.04) 1px, transparent 1px), linear-gradient(rgba(97,229,255,.025) 1px, transparent 1px); background-size: 72px 72px; mask-image: linear-gradient(180deg, black, transparent 90%); }
#game-canvas { position: absolute; inset: 0; display: block; width: 100%; height: 100%; }
.arena-meta, .arena-footer { position: absolute; z-index: 2; left: 22px; right: 22px; justify-content: space-between; color: var(--muted); font-size: 11px; }
.arena-meta { top: 18px; }
.signal { display: inline-flex; align-items: center; gap: 7px; color: var(--green); font-weight: 700; letter-spacing: .08em; text-transform: uppercase; }
.signal i { width: 7px; height: 7px; border-radius: 50%; background: var(--green); box-shadow: 0 0 14px var(--green); }
.arena-footer { bottom: 18px; gap: 12px; }
.progress-track { height: 4px; flex: 1; overflow: hidden; border-radius: 99px; background: rgba(151,190,221,.12); }
.progress-track span { display: block; width: 0; height: 100%; border-radius: inherit; background: linear-gradient(90deg, var(--cyan), var(--green)); transition: width .2s ease; }
#progress-label { min-width: 78px; text-align: right; font-family: "SFMono-Regular", Consolas, monospace; font-size: 10px; }
.upgrade-panel { position: absolute; z-index: 3; top: 14px; right: 14px; width: min(370px, calc(100% - 28px)); max-height: calc(100% - 28px); overflow: auto; border: 1px solid var(--line); border-radius: 18px; background: var(--panel); backdrop-filter: blur(14px); box-shadow: 0 18px 48px rgba(0,0,0,.32); }
.panel-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding: 18px 18px 14px; border-bottom: 1px solid var(--line); }
.icon-button { display: grid; place-items: center; width: 28px; height: 28px; border: 1px solid var(--line); border-radius: 8px; background: transparent; color: var(--muted); cursor: pointer; font-size: 22px; line-height: 1; }
.icon-button:hover { color: var(--text); border-color: rgba(97,229,255,.45); }
.upgrade-content { padding: 16px 18px 18px; }
.panel-tabs { display: grid; grid-template-columns: 1fr 1fr; gap: 6px; padding: 4px; margin-bottom: 14px; border: 1px solid var(--line); border-radius: 10px; background: rgba(4,15,28,.5); }
.panel-tab { padding: 8px; border: 0; border-radius: 7px; background: transparent; color: var(--muted); cursor: pointer; font-size: 11px; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.panel-tab.is-active { background: var(--cyan-soft); color: var(--cyan); box-shadow: inset 0 0 0 1px rgba(97,229,255,.24); }
.panel-copy { margin-bottom: 14px; color: var(--muted); font-size: 12px; line-height: 1.5; }
.point-bank { gap: 7px; margin-bottom: 16px; }
.point-bank > div { display: flex; align-items: center; gap: 6px; min-width: 0; padding: 7px 8px; border: 1px solid var(--line); border-radius: 9px; color: var(--muted); font-size: 10px; }
.point-bank strong { margin-left: 2px; color: var(--text); font-family: "SFMono-Regular", Consolas, monospace; }
.point-dot { width: 6px; height: 6px; border-radius: 50%; }
.skill-dot, .legend-skill { background: var(--cyan); box-shadow: 0 0 10px var(--cyan); }
.perk-dot, .legend-perk { background: var(--amber); box-shadow: 0 0 10px var(--amber); }
.map-toolbar { display: flex; align-items: center; justify-content: space-between; margin-bottom: 8px; color: var(--muted); font-size: 9px; letter-spacing: .06em; text-transform: uppercase; }
.map-toolbar div { display: inline-flex; gap: 4px; }
.map-toolbar button { min-width: 25px; height: 24px; padding: 0 6px; border: 1px solid var(--line); border-radius: 6px; background: rgba(12,31,53,.7); color: var(--text); cursor: pointer; font-size: 11px; }
.map-toolbar button:hover { border-color: rgba(97,229,255,.58); color: var(--cyan); }
#map-zoom-level { min-width: 43px; color: var(--cyan); font-size: 9px; }
.upgrade-map-viewport { max-height: min(58vh, 550px); overflow: auto; border: 1px solid rgba(151,190,221,.1); border-radius: 12px; background: radial-gradient(circle at 50% 50%, rgba(25,74,103,.16), transparent 58%), rgba(4,15,28,.4); cursor: grab; touch-action: none; }
.upgrade-map-viewport:active { cursor: grabbing; }
.upgrade-map { position: relative; width: 560px; height: 720px; background-image: radial-gradient(rgba(97,229,255,.15) 1px, transparent 1px); background-size: 14px 14px; }
.upgrade-links { position: absolute; z-index: 1; inset: 0; width: 100%; height: 100%; overflow: visible; pointer-events: none; }
.upgrade-links line { stroke: rgba(118,163,192,.28); stroke-width: .42; vector-effect: non-scaling-stroke; }
.upgrade-links line.is-reachable { stroke: rgba(134,242,180,.75); stroke-width: .68; }
.upgrade-links line.is-current { stroke: rgba(97,229,255,.8); stroke-width: .72; }
.upgrade-nodes { position: absolute; z-index: 2; inset: 0; }
.upgrade-node { position: absolute; width: 110px; min-height: 70px; padding: 8px 7px; border: 1px solid var(--line); border-radius: 10px; background: rgba(12,31,53,.94); color: var(--muted); cursor: pointer; text-align: left; transform: translate(-50%, -50%); transition: transform .18s ease, border-color .18s ease, background .18s ease; }
.upgrade-node:hover:not(:disabled) { transform: translate(-50%, calc(-50% - 2px)); border-color: rgba(97,229,255,.68); background: rgba(22,57,89,.8); }
.upgrade-node:focus-visible { transform: translate(-50%, calc(-50% - 2px)); border-color: var(--cyan); }
.upgrade-node:disabled { cursor: not-allowed; opacity: .48; }
.upgrade-node.is-current, .upgrade-node.is-unlocked { border-color: var(--cyan); background: var(--cyan-soft); box-shadow: 0 0 22px rgba(97,229,255,.12); }
.upgrade-node.is-reachable { border-color: rgba(134,242,180,.48); }
.upgrade-node.is-perk { border-color: rgba(255,196,107,.26); }
.upgrade-node.is-free { display: grid; place-items: center; width: 30px; min-height: 30px; padding: 0; border-radius: 3px; background: rgba(20,48,72,.94); transform: translate(-50%, -50%) rotate(45deg); }
.upgrade-node.is-free:hover:not(:disabled), .upgrade-node.is-free:focus-visible { transform: translate(-50%, -50%) rotate(45deg) scale(1.13); }
.free-node-mark { width: 12px; height: 12px; border: 1px solid var(--cyan); background: rgba(97,229,255,.2); }
.node-kicker { display: block; margin-bottom: 7px; font-size: 9px; text-transform: uppercase; letter-spacing: .08em; }
.node-label { display: block; color: var(--text); font-size: 11px; font-weight: 700; line-height: 1.18; }
.node-rank { display: block; margin-top: 6px; font-family: "SFMono-Regular", Consolas, monospace; font-size: 9px; }
.upgrade-legend { display: flex; justify-content: space-between; gap: 8px; margin-top: 14px; color: var(--muted); font-size: 9px; }
.upgrade-legend span { display: inline-flex; align-items: center; gap: 5px; }
.upgrade-legend i { width: 5px; height: 5px; border-radius: 50%; }
.legend-free { border: 1px solid var(--green); background: transparent; transform: rotate(45deg); }
.stats-tab { min-height: 420px; }
.stats-group { margin-bottom: 16px; }
.stats-group h3 { margin: 0 0 8px; color: var(--muted); font-size: 10px; letter-spacing: .12em; text-transform: uppercase; }
.stats-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 7px; }
.stats-item { padding: 9px; border: 1px solid var(--line); border-radius: 9px; background: rgba(14,31,53,.5); }
.stats-item span, .stats-item strong { display: block; }
.stats-item span { margin-bottom: 5px; color: var(--muted); font-size: 9px; letter-spacing: .08em; text-transform: uppercase; }
.stats-item strong { color: var(--text); font-family: "SFMono-Regular", Consolas, monospace; font-size: 12px; }
.reopen-button { display: none; position: absolute; top: 14px; right: 14px; z-index: 4; width: 36px; height: 36px; padding: 0; border: 1px solid rgba(97,229,255,.42); border-radius: 9px; background: rgba(8, 20, 36, .9); color: var(--cyan); cursor: pointer; font-size: 20px; line-height: 1; }
.panel-collapsed .upgrade-panel { display: none; }
.panel-collapsed .reopen-button { display: block; }

@media (max-width: 820px) {
  .game-shell { padding: 16px 12px 24px; }
  .topbar { align-items: flex-start; flex-direction: column; gap: 14px; }
  .run-stats { width: 100%; }
  .stat-chip { flex: 1; min-width: 0; }
  .arena-frame { min-height: 68vh; }
  .upgrade-panel { top: 12px; right: 12px; width: calc(100% - 24px); }
  .upgrade-map-viewport { max-height: 58vh; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; animation-duration: .01ms !important; }
}