:root {
  color-scheme: dark;
  --bg: #071019;
  --bg-2: #11212d;
  --panel: rgba(12, 18, 25, 0.82);
  --panel-strong: rgba(16, 24, 32, 0.94);
  --panel-soft: rgba(255, 255, 255, 0.06);
  --text: #edf4ff;
  --muted: #9fb0c7;
  --muted-2: #76859d;
  --accent: #93e7ce;
  --accent-2: #f7c56b;
  --good: #9cf0a9;
  --border: rgba(162, 177, 204, 0.18);
  --shadow: 0 28px 90px rgba(0, 0, 0, 0.38);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
  color: var(--text);
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  background:
    radial-gradient(
      circle at 20% 8%,
      rgba(255, 214, 139, 0.17),
      transparent 24%
    ),
    radial-gradient(
      circle at 86% 12%,
      rgba(147, 231, 206, 0.13),
      transparent 26%
    ),
    radial-gradient(circle at 55% 0%, rgba(53, 82, 92, 0.2), transparent 32%),
    linear-gradient(180deg, #071019 0%, #0d1820 46%, #12232c 100%);
}

body {
  min-height: 100vh;
  padding: 18px 12px 28px;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.02) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.26), transparent 86%);
}

.app-shell {
  width: min(1760px, calc(100vw - 24px));
  margin: 0 auto;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  justify-items: start;
  text-align: left;
  margin-bottom: 18px;
}

.hero-copy {
  max-width: 86ch;
}

.eyebrow {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.76rem;
  font-weight: 800;
}

h1 {
  margin: 0;
  font-size: clamp(2.4rem, 5vw, 4.8rem);
  line-height: 0.94;
  letter-spacing: -0.04em;
}

.lede {
  max-width: 62ch;
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.65;
}

.hero-pills {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-start;
  gap: 10px;
  margin-top: 18px;
}

.pill {
  display: inline-flex;
  align-items: center;
  min-height: 36px;
  padding: 0 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.05),
    rgba(255, 255, 255, 0.025)
  );
  color: var(--muted);
  font-size: 0.93rem;
  backdrop-filter: blur(10px);
}

.controls-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  justify-content: flex-start;
  max-width: none;
}

.level-btn {
  position: relative;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.08),
    rgba(255, 255, 255, 0.04)
  );
  color: var(--text);
  cursor: pointer;
  font-weight: 800;
  font-size: 0.95rem;
  transition:
    transform 160ms ease,
    background 160ms ease,
    box-shadow 160ms ease,
    border-color 160ms ease;
}

.level-btn:hover {
  transform: translateY(-1px);
  border-color: rgba(147, 231, 206, 0.42);
  background: rgba(147, 231, 206, 0.12);
}

.level-btn[data-active="true"] {
  background: linear-gradient(
    180deg,
    rgba(147, 231, 206, 0.28),
    rgba(147, 231, 206, 0.18)
  );
  border-color: rgba(147, 231, 206, 0.68);
  box-shadow:
    0 0 0 1px rgba(147, 231, 206, 0.24),
    0 10px 24px rgba(12, 26, 39, 0.5);
}

.level-btn[data-complete="true"]::after {
  content: "✓";
  position: absolute;
  right: -4px;
  top: -6px;
  width: 18px;
  height: 18px;
  display: grid;
  place-items: center;
  border-radius: 999px;
  background: var(--good);
  color: #05230f;
  font-size: 0.72rem;
  font-weight: 900;
  box-shadow: 0 8px 18px rgba(0, 0, 0, 0.26);
}

.game-card {
  width: 100%;
  margin: 0 auto;
  background: linear-gradient(
    180deg,
    rgba(15, 20, 24, 0.94),
    rgba(8, 11, 15, 0.96)
  );
  border: 1px solid var(--border);
  border-radius: 30px;
  padding: 6px;
  box-shadow:
    var(--shadow),
    inset 0 1px 0 rgba(255, 255, 255, 0.04);
  backdrop-filter: blur(14px);
}

.board-shell {
  display: grid;
  grid-template-columns: minmax(0, 2.9fr) minmax(390px, 460px);
  gap: 0;
  align-items: stretch;
}

.board-frame {
  position: relative;
  min-width: 0;
  display: grid;
  place-items: center;
}

canvas {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1280 / 820;
  border-radius: 24px;
  background: #1a2432;
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.06);
}

.completion-banner {
  position: absolute;
  left: 50%;
  top: 18px;
  transform: translateX(-50%);
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  padding: 12px 18px;
  border-radius: 999px;
  background: rgba(5, 12, 22, 0.92);
  border: 1px solid rgba(148, 163, 184, 0.22);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.35);
  color: #fff;
  z-index: 3;
  min-width: min(78%, 460px);
  text-align: center;
}
.completion-banner[hidden] {
  display: none !important;
}

.completion-banner strong {
  font-size: 0.96rem;
  letter-spacing: 0.01em;
}

.completion-banner span {
  color: var(--muted);
  font-size: 0.84rem;
}

.completion-banner[data-state="success"] {
  border-color: rgba(149, 242, 176, 0.42);
  box-shadow:
    0 18px 44px rgba(0, 0, 0, 0.35),
    0 0 0 1px rgba(149, 242, 176, 0.12) inset;
}

.completion-banner[data-state="fail"] {
  border-color: rgba(255, 120, 120, 0.52);
  box-shadow:
    0 18px 44px rgba(0, 0, 0, 0.35),
    0 0 0 1px rgba(255, 120, 120, 0.14) inset;
}

.completion-banner[data-state="fail"] span {
  color: #ffd6d6;
}

.side-rail {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  position: sticky;
  top: 14px;
  align-content: start;
  justify-self: stretch;
}

.panel-card {
  border-radius: 24px;
  padding: 16px 16px 18px;
  background: linear-gradient(
    180deg,
    rgba(15, 24, 28, 0.85),
    rgba(10, 17, 22, 0.84)
  );
  border: 1px solid var(--border);
}

.panel-primary {
  background: linear-gradient(
    180deg,
    rgba(19, 26, 30, 0.96),
    rgba(10, 16, 20, 0.9)
  );
}

.panel-label {
  margin: 0 0 10px;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.72rem;
  font-weight: 800;
}

.panel-card h2 {
  margin: 0;
  font-size: 1.32rem;
}

.panel-card p {
  margin: 8px 0 0;
  color: var(--muted);
  line-height: 1.55;
}

.progress-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 14px;
  color: var(--muted);
  font-size: 0.88rem;
}

.progress-track {
  height: 10px;
  margin-top: 10px;
  border-radius: 999px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.08),
    rgba(255, 255, 255, 0.04)
  );
  overflow: hidden;
}

.progress-fill {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  box-shadow: 0 0 18px rgba(138, 215, 227, 0.3);
  transition: width 220ms ease;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.stat-card {
  min-width: 0;
  padding: 14px;
  border-radius: 20px;
  background: linear-gradient(
    180deg,
    rgba(255, 255, 255, 0.05),
    rgba(255, 255, 255, 0.025)
  );
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.stat-status {
  grid-column: 1 / -1;
}

.stat-card span {
  display: block;
  color: var(--muted-2);
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.14em;
}

.stat-card strong {
  display: block;
  margin-top: 8px;
  font-size: clamp(0.92rem, 1.15vw, 1.15rem);
  line-height: 1.1;
  overflow-wrap: anywhere;
}

.tips {
  margin: 0;
  padding-left: 1.2rem;
  color: var(--muted);
  line-height: 1.65;
}

.tips li + li {
  margin-top: 8px;
}

.secondary-action {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 18px;
  padding: 14px 16px;
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
  cursor: pointer;
  font: inherit;
  font-weight: 700;
  transition:
    transform 160ms ease,
    background 160ms ease,
    border-color 160ms ease;
}

.secondary-action:hover {
  transform: translateY(-1px);
  border-color: rgba(147, 231, 206, 0.42);
  background: rgba(147, 231, 206, 0.08);
}

kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.65em;
  padding: 0.16rem 0.45rem;
  border: 1px solid rgba(148, 163, 184, 0.36);
  border-bottom-width: 3px;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.07);
  color: #fff;
  font: inherit;
  font-weight: 800;
}

@media (max-width: 1040px) {
  .board-shell {
    grid-template-columns: 1fr;
  }

  .side-rail {
    grid-template-columns: 1fr;
  }

  .controls-row {
    justify-content: flex-start;
  }

  .side-rail {
    position: static;
  }
}

@media (max-width: 780px) {
  body {
    padding: 18px 12px 28px;
  }

  .game-card {
    border-radius: 24px;
    padding: 14px;
  }

  canvas {
    aspect-ratio: auto;
  }

  .completion-banner {
    min-width: calc(100% - 24px);
  }

  .progress-meta,
  .stat-grid {
    grid-template-columns: 1fr;
  }

  .progress-meta {
    flex-direction: column;
  }
}