:root {
  color-scheme: light;
  --ink: #22201d;
  --muted: #6d6861;
  --paper: rgba(255, 255, 255, 0.92);
  --line: rgba(40, 36, 31, 0.12);
  --accent: #2f7c67;
  --accent-strong: #185b4d;
  --blue: #3f6fb5;
  --rose: #c65b70;
  --gold: #b98724;
  --shadow: 0 24px 70px rgba(38, 34, 28, 0.13);
  --radius: 8px;
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    linear-gradient(120deg, rgba(63, 111, 181, 0.10), transparent 32%),
    linear-gradient(245deg, rgba(47, 124, 103, 0.16), transparent 36%),
    #eef1f3;
  overflow-x: hidden;
}

button {
  font: inherit;
  cursor: pointer;
}

#sparkCanvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 0;
}

.app-shell {
  position: relative;
  z-index: 1;
  min-height: 100vh;
  padding: 28px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 350px);
  gap: 18px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.58);
  border-radius: 12px;
  background:
    linear-gradient(rgba(255, 255, 255, 0.78), rgba(255, 255, 255, 0.78)),
    repeating-linear-gradient(0deg, rgba(42, 38, 31, 0.035) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(90deg, rgba(42, 38, 31, 0.03) 0 1px, transparent 1px 34px);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.topbar,
.stats-grid,
.game-panel {
  grid-column: 1;
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 8px 4px 2px;
}

.brand-block {
  display: flex;
  align-items: center;
  min-width: 0;
  gap: 12px;
}

.brand-mark {
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: #fff;
  background: linear-gradient(145deg, #1f1e1c, #4a4740);
  font-weight: 800;
  box-shadow: inset 0 1px 0 rgba(255, 255, 255, 0.22);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: clamp(1.35rem, 1.8vw, 1.9rem);
  letter-spacing: 0;
}

.brand-block p {
  color: var(--muted);
  margin-top: 3px;
  line-height: 1.35;
}

.session-actions {
  display: flex;
  align-items: center;
  gap: 10px;
}

.icon-button,
.primary-button,
.secondary-button {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.82);
  color: var(--ink);
  min-height: 40px;
  transition: transform 160ms ease, border-color 160ms ease, background 160ms ease;
}

.icon-button {
  display: grid;
  place-items: center;
  width: 42px;
  padding: 0;
  font-weight: 900;
}

.icon-button[aria-pressed="true"] {
  color: #fff;
  border-color: rgba(47, 124, 103, 0.35);
  background: var(--accent);
}

.primary-button {
  min-width: 116px;
  padding: 0 16px;
  color: #fff;
  background: var(--ink);
  font-weight: 750;
}

.primary-button:disabled {
  cursor: not-allowed;
  opacity: 0.64;
}

.secondary-button {
  min-width: 86px;
  padding: 0 13px;
  color: var(--ink);
  background: rgba(255, 255, 255, 0.84);
  font-weight: 700;
}

.secondary-button:disabled {
  cursor: not-allowed;
  opacity: 0.45;
}

.icon-button:hover,
.primary-button:hover,
.secondary-button:not(:disabled):hover {
  transform: translateY(-1px);
  border-color: rgba(34, 32, 29, 0.28);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 12px;
}

.metric,
.game-panel,
.insight-panel,
.level-rail {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
}

.metric {
  display: grid;
  gap: 8px;
  min-height: 112px;
  padding: 14px;
}

.metric-label,
.eyebrow,
.hand-card span,
.focus-card span {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 750;
  letter-spacing: 0;
  text-transform: uppercase;
}

.metric strong {
  font-size: clamp(1.8rem, 4vw, 3rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.metric-hint {
  color: var(--muted);
  font-size: 0.86rem;
  line-height: 1.3;
}

.level-metric strong {
  color: var(--accent-strong);
}

.game-panel {
  display: grid;
  gap: 14px;
  padding: 18px;
}

.game-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
}

.game-toolbar h2 {
  margin-top: 4px;
  font-size: clamp(1.05rem, 2.2vw, 1.45rem);
  letter-spacing: 0;
}

.timer-pill {
  flex: 0 0 auto;
  min-width: 74px;
  padding: 9px 12px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  text-align: center;
  font-weight: 750;
}

.game-board {
  position: relative;
  height: clamp(330px, 48vh, 520px);
  overflow: hidden;
  border: 1px solid rgba(34, 32, 29, 0.14);
  border-radius: var(--radius);
  background:
    linear-gradient(180deg, rgba(63, 111, 181, 0.08), transparent 45%),
    radial-gradient(circle at 50% 0%, rgba(47, 124, 103, 0.13), transparent 38%),
    #fff;
  outline: none;
}

.game-board:focus {
  box-shadow: 0 0 0 4px rgba(47, 124, 103, 0.13);
}

.danger-line {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 6px;
  background: linear-gradient(90deg, var(--rose), var(--gold), var(--rose));
  opacity: 0.86;
}

.center-state {
  position: absolute;
  inset: 0;
  display: grid;
  place-content: center;
  gap: 8px;
  padding: 28px;
  text-align: center;
  background: rgba(255, 255, 255, 0.70);
  transition: opacity 180ms ease, transform 180ms ease;
}

.center-state strong {
  font-size: clamp(2.2rem, 8vw, 4.4rem);
  letter-spacing: 0;
}

.center-state span {
  max-width: 420px;
  color: var(--muted);
  line-height: 1.45;
}

.center-state.is-hidden {
  opacity: 0;
  transform: scale(0.98);
  pointer-events: none;
}

.falling-letter {
  position: absolute;
  left: 0;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 1px;
  width: 54px;
  height: 54px;
  border: 1px solid rgba(34, 32, 29, 0.16);
  border-radius: var(--radius);
  color: #fff;
  background: linear-gradient(145deg, var(--ink), #4c4943);
  box-shadow: 0 12px 24px rgba(34, 32, 29, 0.18);
  font-size: 1.55rem;
  font-weight: 850;
  will-change: transform;
}

.falling-letter span {
  display: inline-grid;
  place-items: center;
  min-width: 0.74em;
  line-height: 1;
}

.falling-letter span.done {
  color: rgba(255, 255, 255, 0.42);
}

.falling-letter span.current {
  color: #fff;
  border-radius: 5px;
  background: rgba(185, 135, 36, 0.9);
  box-shadow: 0 0 0 4px rgba(185, 135, 36, 0.18);
}

.falling-letter.is-danger {
  background: var(--rose);
}

.keyboard-guide {
  display: grid;
  grid-template-columns: minmax(132px, 0.55fr) minmax(0, 1.5fr) minmax(132px, 0.55fr);
  gap: 12px;
  align-items: stretch;
}

.hand-card {
  display: grid;
  align-content: center;
  gap: 7px;
  min-height: 128px;
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  transition: border-color 160ms ease, background 160ms ease, transform 160ms ease;
}

.hand-card strong {
  font-size: 1.32rem;
  letter-spacing: 0;
}

.hand-card small {
  color: var(--muted);
  line-height: 1.35;
}

.hand-card.is-active {
  border-color: rgba(47, 124, 103, 0.45);
  background: rgba(47, 124, 103, 0.09);
  transform: translateY(-1px);
}

.keyboard {
  display: grid;
  align-content: center;
  gap: 7px;
  min-width: 0;
  padding: 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.72);
}

.key-row {
  display: grid;
  grid-template-columns: repeat(12, minmax(22px, 1fr));
  gap: 5px;
}

.key-row.row-1 {
  padding-left: 4%;
}

.key-row.row-2 {
  grid-template-columns: repeat(9, minmax(22px, 1fr));
  padding-left: 10%;
  padding-right: 10%;
}

.key {
  display: grid;
  place-items: center;
  aspect-ratio: 1 / 0.82;
  min-height: 30px;
  border: 1px solid rgba(34, 32, 29, 0.14);
  border-radius: 6px;
  background: #fff;
  color: var(--ink);
  font-size: clamp(0.78rem, 1.2vw, 0.98rem);
  font-weight: 800;
  transition: transform 110ms ease, background 110ms ease, border-color 110ms ease, color 110ms ease;
}

.key.is-home {
  border-color: rgba(63, 111, 181, 0.36);
  background: rgba(63, 111, 181, 0.08);
}

.key.is-learned {
  border-color: rgba(47, 124, 103, 0.34);
  background: rgba(47, 124, 103, 0.08);
}

.key.is-target {
  color: #fff;
  border-color: rgba(47, 124, 103, 0.55);
  background: var(--accent);
  transform: translateY(-2px);
}

.key.is-hit {
  animation: keyHit 220ms ease;
}

.key.is-miss {
  animation: keyMiss 260ms ease;
}

.insight-panel {
  grid-column: 2;
  grid-row: 1 / span 3;
  align-self: stretch;
  display: grid;
  align-content: start;
  gap: 14px;
  padding: 16px;
}

.insight-header {
  display: grid;
  gap: 6px;
}

.insight-header strong {
  font-size: clamp(3rem, 8vw, 5rem);
  line-height: 0.92;
  letter-spacing: 0;
}

.focus-card {
  display: grid;
  gap: 9px;
  padding: 14px;
  border: 1px solid rgba(47, 124, 103, 0.18);
  border-radius: var(--radius);
  background: rgba(47, 124, 103, 0.08);
}

.focus-card p {
  color: var(--ink);
  line-height: 1.45;
}

.level-rail {
  display: grid;
  gap: 12px;
  padding: 14px;
}

.rail-track {
  display: grid;
  gap: 8px;
}

.level-chip {
  position: relative;
  min-height: 38px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: #fff;
  color: var(--muted);
  padding: 10px;
  font-size: 0.86rem;
  font-weight: 750;
}

.level-chip::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 4px;
  background: transparent;
}

.level-chip.is-active {
  color: var(--ink);
  border-color: rgba(47, 124, 103, 0.38);
  background: rgba(47, 124, 103, 0.10);
}

.level-chip.is-active::before {
  background: var(--accent);
}

.level-chip.is-done::before {
  background: var(--blue);
}

.level-note {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.38;
}

.history-list {
  display: grid;
  gap: 8px;
}

.history-item {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 8px;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.76);
}

.history-item span {
  display: block;
  margin-top: 3px;
  color: var(--muted);
  font-size: 0.82rem;
}

.history-item strong {
  font-size: 0.96rem;
}

.toast {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 4;
  max-width: min(360px, calc(100vw - 32px));
  padding: 12px 14px;
  border: 1px solid rgba(255, 255, 255, 0.62);
  border-radius: var(--radius);
  color: #fff;
  background: rgba(31, 30, 28, 0.92);
  box-shadow: 0 16px 44px rgba(31, 30, 28, 0.22);
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 180ms ease, transform 180ms ease;
  pointer-events: none;
}

.toast.show {
  opacity: 1;
  transform: translateY(0);
}

.shake {
  animation: shake 260ms ease;
}

@keyframes keyHit {
  0% {
    transform: scale(1);
  }
  45% {
    transform: scale(1.12);
    background: var(--blue);
    color: #fff;
  }
  100% {
    transform: scale(1);
  }
}

@keyframes keyMiss {
  0%,
  100% {
    transform: translateX(0);
  }
  35% {
    transform: translateX(-4px);
    background: var(--rose);
    color: #fff;
  }
  70% {
    transform: translateX(4px);
  }
}

@keyframes shake {
  0%,
  100% {
    transform: translateX(0);
  }
  30% {
    transform: translateX(-5px);
  }
  65% {
    transform: translateX(5px);
  }
}

@media (max-width: 980px) {
  .app-shell {
    padding: 16px;
  }

  .workspace {
    grid-template-columns: 1fr;
  }

  .topbar,
  .stats-grid,
  .game-panel,
  .insight-panel {
    grid-column: 1;
  }

  .insight-panel {
    grid-row: auto;
  }

  .stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .workspace {
    padding: 12px;
  }

  .topbar,
  .game-toolbar {
    align-items: stretch;
    flex-direction: column;
  }

  .session-actions {
    width: 100%;
  }

  .primary-button,
  .secondary-button {
    flex: 1;
  }

  .stats-grid,
  .keyboard-guide {
    grid-template-columns: 1fr;
  }

  .game-board {
    height: 390px;
  }

  .key-row {
    gap: 4px;
  }

  .key {
    min-height: 28px;
  }
}

@media (max-width: 480px) {
  .stats-grid {
    grid-template-columns: 1fr;
  }

  .game-panel {
    padding: 12px;
  }

  .keyboard {
    padding: 8px;
  }

  .key {
    min-height: 24px;
    border-radius: 5px;
  }
}