:root {
  color-scheme: dark;
  --bg: #061119;
  --bg-2: #0b1a25;
  --panel-line: rgba(133, 221, 255, 0.18);
  --ink: #f0fcff;
  --muted: rgba(220, 240, 247, 0.72);
  --aqua: #6ef5ff;
  --cyan: #26b4f5;
  --lime: #c6ff5e;
  --gold: #ffd76d;
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  background:
    radial-gradient(circle at top, rgba(31, 90, 122, 0.33), transparent 36%),
    radial-gradient(circle at bottom right, rgba(255, 94, 188, 0.12), transparent 28%),
    linear-gradient(180deg, var(--bg-2), var(--bg));
  color: var(--ink);
  font-family: "Trebuchet MS", "Segoe UI", sans-serif;
}

body {
  display: grid;
  place-items: center;
  padding: 24px;
}

.shell {
  width: min(100%, 1400px);
}

.stage-frame {
  position: relative;
  aspect-ratio: 16 / 9;
  width: 100%;
  border-radius: 28px;
  overflow: hidden;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: var(--shadow);
  background: #041018;
}

#game-canvas {
  display: block;
  width: 100%;
  height: 100%;
}

.screen {
  position: absolute;
  inset: 0;
  display: none;
  align-items: center;
  justify-content: center;
  padding: 32px;
  background:
    linear-gradient(180deg, rgba(2, 9, 17, 0.12), rgba(2, 9, 17, 0.74)),
    radial-gradient(circle at top, rgba(110, 245, 255, 0.12), transparent 46%);
  backdrop-filter: blur(10px);
}

.screen.active {
  display: flex;
}

.screen-panel {
  width: min(960px, 100%);
  max-height: 100%;
  overflow: auto;
  padding: 34px 36px;
  border-radius: 28px;
  border: 1px solid var(--panel-line);
  background: linear-gradient(180deg, rgba(16, 31, 46, 0.84), rgba(8, 18, 28, 0.92));
  box-shadow: 0 16px 60px rgba(2, 7, 11, 0.36);
}

.screen-panel.compact {
  width: min(420px, 100%);
  text-align: center;
}

.screen-panel.wide {
  width: min(980px, 100%);
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--aqua);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 12px;
}

h1,
h2 {
  margin: 0;
  line-height: 0.95;
  letter-spacing: 0.04em;
}

h1 {
  font-size: clamp(44px, 7vw, 74px);
}

h2 {
  font-size: clamp(30px, 4vw, 52px);
}

.lead {
  margin: 14px 0 0;
  max-width: 62ch;
  color: var(--muted);
  line-height: 1.55;
  font-size: 15px;
}

.stage-copy {
  margin-top: 16px;
  min-height: 48px;
}

.stage-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
  margin-top: 20px;
}

.hero-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.stage-card {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(14, 29, 44, 0.96), rgba(8, 19, 28, 0.94));
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.stage-card:hover,
.stage-card:focus-visible,
.stage-card.active {
  transform: translateY(-3px);
  border-color: rgba(110, 245, 255, 0.5);
  box-shadow: 0 20px 36px rgba(2, 7, 11, 0.3);
  outline: none;
}

.stage-card.active {
  background: linear-gradient(180deg, rgba(24, 45, 66, 0.98), rgba(8, 19, 28, 0.94));
}

.hero-card {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  padding: 16px;
  background: linear-gradient(180deg, rgba(19, 23, 44, 0.96), rgba(8, 14, 28, 0.94));
  color: var(--ink);
  cursor: pointer;
  text-align: left;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.hero-card:hover,
.hero-card:focus-visible,
.hero-card.active {
  transform: translateY(-3px);
  border-color: rgba(198, 255, 94, 0.54);
  box-shadow: 0 20px 36px rgba(2, 7, 11, 0.32);
  outline: none;
}

.hero-card.active {
  background: linear-gradient(180deg, rgba(30, 36, 67, 0.98), rgba(8, 14, 28, 0.94));
}

.stage-card .slot {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--aqua);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 11px;
}

.stage-card h3 {
  margin: 0;
  font-size: 21px;
}

.stage-card p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 13px;
}

.stage-card .difficulty {
  display: inline-block;
  margin-top: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(110, 245, 255, 0.12);
  color: var(--ink);
  font-size: 12px;
}

.hero-card .slot {
  display: inline-block;
  margin-bottom: 10px;
  color: var(--lime);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 11px;
}

.hero-card h3 {
  margin: 0;
  font-size: 20px;
}

.hero-card p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.5;
  font-size: 13px;
}

.hero-card .kit {
  display: inline-block;
  margin-top: 14px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(198, 255, 94, 0.12);
  color: var(--ink);
  font-size: 12px;
}

.control-grid {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px 16px;
  margin: 22px 0 24px;
  color: var(--muted);
}

.control-grid strong {
  color: var(--ink);
}

.credit-line {
  margin: 0 0 18px;
  color: rgba(240, 252, 255, 0.64);
  line-height: 1.45;
  font-size: 13px;
}

.meta-shell {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr);
  gap: 16px;
  margin-top: 18px;
}

.wallet-card,
.meta-panel {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  padding: 18px 18px 20px;
  background: linear-gradient(180deg, rgba(14, 29, 44, 0.94), rgba(8, 19, 28, 0.94));
}

.wallet-balance {
  margin: 4px 0 0;
  font-size: clamp(28px, 4vw, 42px);
  line-height: 0.98;
  letter-spacing: 0.04em;
}

.wallet-copy,
.meta-copy {
  margin-top: 12px;
  max-width: none;
}

.meta-upgrade-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.meta-upgrade-card {
  appearance: none;
  display: grid;
  gap: 10px;
  min-height: 176px;
  padding: 16px;
  border-radius: 20px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: linear-gradient(180deg, rgba(20, 37, 54, 0.98), rgba(10, 19, 30, 0.96));
  color: var(--ink);
  text-align: left;
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease, filter 140ms ease;
}

.meta-upgrade-card:hover,
.meta-upgrade-card:focus-visible {
  transform: translateY(-3px);
  border-color: rgba(110, 245, 255, 0.46);
  box-shadow: 0 18px 30px rgba(2, 7, 11, 0.28);
  outline: none;
}

.meta-upgrade-card[disabled] {
  cursor: not-allowed;
  opacity: 0.72;
  filter: saturate(0.8);
}

.meta-upgrade-card .slot {
  display: inline-block;
  color: var(--aqua);
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 11px;
}

.meta-upgrade-card h3 {
  margin: 0;
  font-size: 19px;
}

.meta-upgrade-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.48;
  font-size: 13px;
}

.meta-upgrade-card .meta-rank {
  color: var(--lime);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.meta-upgrade-card .meta-cost {
  display: inline-flex;
  width: fit-content;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  padding: 7px 10px;
  border-radius: 999px;
  background: rgba(255, 215, 109, 0.12);
  color: #ffe8a6;
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.meta-upgrade-card .meta-bonus {
  color: rgba(240, 252, 255, 0.88);
  font-size: 12px;
  line-height: 1.4;
}

.action-btn {
  appearance: none;
  border: 0;
  border-radius: 999px;
  padding: 14px 22px;
  font: inherit;
  font-weight: 700;
  color: #031118;
  background: linear-gradient(135deg, var(--lime), var(--aqua));
  box-shadow:
    0 10px 24px rgba(110, 245, 255, 0.16),
    inset 0 1px 0 rgba(255, 255, 255, 0.36);
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease, filter 140ms ease;
}

.action-btn:hover,
.action-btn:focus-visible {
  transform: translateY(-2px);
  filter: brightness(1.04);
  box-shadow:
    0 16px 32px rgba(110, 245, 255, 0.18),
    inset 0 1px 0 rgba(255, 255, 255, 0.4);
  outline: none;
}

.ghost-btn {
  appearance: none;
  border: 1px solid rgba(110, 245, 255, 0.32);
  border-radius: 999px;
  padding: 14px 22px;
  font: inherit;
  font-weight: 700;
  color: var(--ink);
  background: rgba(9, 18, 29, 0.5);
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, background 140ms ease;
}

.ghost-btn:hover,
.ghost-btn:focus-visible {
  transform: translateY(-2px);
  border-color: rgba(110, 245, 255, 0.6);
  background: rgba(11, 27, 43, 0.68);
  outline: none;
}

.action-row {
  display: flex;
  gap: 12px;
  justify-content: center;
  margin-top: 24px;
  flex-wrap: wrap;
}

.upgrade-list {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
  margin-top: 28px;
}

.upgrade-card {
  appearance: none;
  display: grid;
  gap: 14px;
  min-height: 220px;
  padding: 22px;
  border-radius: 24px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  text-align: left;
  color: var(--ink);
  background: linear-gradient(180deg, rgba(14, 29, 44, 0.96), rgba(8, 19, 28, 0.94));
  cursor: pointer;
  transition: transform 140ms ease, border-color 140ms ease, box-shadow 140ms ease;
}

.upgrade-card:hover,
.upgrade-card:focus-visible {
  transform: translateY(-4px);
  border-color: rgba(110, 245, 255, 0.45);
  box-shadow: 0 24px 40px rgba(2, 7, 11, 0.3);
  outline: none;
}

.upgrade-card .slot {
  color: var(--aqua);
  text-transform: uppercase;
  letter-spacing: 0.2em;
  font-size: 11px;
}

.upgrade-card h3 {
  margin: 0;
  font-size: 27px;
}

.upgrade-card p {
  margin: 0;
  color: var(--muted);
  line-height: 1.6;
}

.upgrade-card .upgrade-tier {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  line-height: 1.2;
}

.upgrade-card .upgrade-meta {
  color: rgba(198, 255, 94, 0.84);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  line-height: 1.4;
}

.upgrade-card.tier-bronze {
  border-color: rgba(217, 139, 62, 0.26);
  box-shadow: inset 0 0 0 1px rgba(217, 139, 62, 0.08);
}

.upgrade-card.tier-bronze .upgrade-tier {
  color: #d98b3e;
}

.upgrade-card.tier-silver {
  border-color: rgba(200, 215, 232, 0.28);
  box-shadow: inset 0 0 0 1px rgba(200, 215, 232, 0.08);
}

.upgrade-card.tier-silver .upgrade-tier {
  color: #c8d7e8;
}

.upgrade-card.tier-gold {
  border-color: rgba(255, 215, 109, 0.34);
  box-shadow: inset 0 0 0 1px rgba(255, 215, 109, 0.1);
}

.upgrade-card.tier-gold .upgrade-tier {
  color: #ffd76d;
}

.upgrade-card.tier-diamond {
  border-color: rgba(127, 230, 255, 0.36);
  box-shadow: inset 0 0 0 1px rgba(127, 230, 255, 0.12);
}

.upgrade-card.tier-diamond .upgrade-tier {
  color: #7fe6ff;
}

@media (max-width: 920px) {
  body {
    padding: 14px;
  }

  .screen {
    padding: 18px;
  }

  .screen-panel {
    padding: 24px 22px;
  }

  .upgrade-list {
    grid-template-columns: 1fr;
  }

  .stage-list {
    grid-template-columns: 1fr;
  }

  .hero-list {
    grid-template-columns: 1fr;
  }

  .meta-shell {
    grid-template-columns: 1fr;
  }

  .meta-upgrade-list {
    grid-template-columns: 1fr;
  }

  .upgrade-card {
    min-height: 0;
  }
}