:root {
  --bg: #1c2238;
  --bg-panel: #24314d;
  --bg-panel-soft: #1e2940;
  --border: #0f1322;
  --accent: #f3c969;
  --accent-strong: #f67c59;
  --sky: #87d4ff;
  --grass: #7ec76e;
  --path: #b39a78;
  --enemy: #ff7878;
  --slot: #5bc0be;
  --text: #f6f2e8;
  --muted: #c7d0e0;
  --shadow: 0 6px 0 #111728;
  --safe-top: env(safe-area-inset-top, 0px);
  --safe-right: env(safe-area-inset-right, 0px);
  --safe-bottom: env(safe-area-inset-bottom, 0px);
  --safe-left: env(safe-area-inset-left, 0px);
}

* {
  box-sizing: border-box;
}

.hidden {
  display: none !important;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: "Trebuchet MS", "Verdana", sans-serif;
  background:
    radial-gradient(circle at top, #325b7a 0, #22304d 32%, #13182b 100%);
  color: var(--text);
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
}

body.panel-drawer-open {
  overflow: hidden;
}

button,
input,
textarea {
  font: inherit;
}

button {
  appearance: none;
  -webkit-appearance: none;
  border-radius: 0;
  -webkit-tap-highlight-color: transparent;
}

button,
.tower-card,
.quiz-option,
#gameCanvas {
  touch-action: manipulation;
}

.shell {
  min-height: 100vh;
  min-height: 100dvh;
  padding:
    calc(20px + var(--safe-top))
    calc(20px + var(--safe-right))
    calc(20px + var(--safe-bottom))
    calc(20px + var(--safe-left));
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 16px;
}

.eyebrow {
  margin: 0 0 4px;
  color: var(--accent);
  letter-spacing: 0.12em;
  font-size: 12px;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  margin-top: 0;
}

h1 {
  margin-bottom: 0;
  font-size: clamp(24px, 2vw, 34px);
}

.topbar-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: stretch;
}

.layout {
  display: grid;
  grid-template-columns: 280px minmax(0, 1fr) 300px;
  grid-template-areas: "left board right";
  gap: 16px;
  align-items: start;
}

.left-panel {
  grid-area: left;
}

.board-panel {
  grid-area: board;
}

.right-panel {
  grid-area: right;
}

.panel {
  background: linear-gradient(180deg, var(--bg-panel) 0%, var(--bg-panel-soft) 100%);
  border: 4px solid var(--border);
  box-shadow: var(--shadow);
  padding: 16px;
  position: relative;
  overflow: hidden;
}

.panel::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(255, 255, 255, 0.04), transparent 32%),
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 26px,
      rgba(255, 255, 255, 0.02) 26px,
      rgba(255, 255, 255, 0.02) 27px
    );
  pointer-events: none;
}

.left-panel,
.right-panel {
  display: grid;
  gap: 16px;
}

.stat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.stat-card,
.chapter-badge {
  background: rgba(255, 255, 255, 0.06);
  border: 3px solid rgba(255, 255, 255, 0.08);
  padding: 10px;
}

.stat-card span,
.mini-copy {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.stat-card strong {
  display: block;
  margin-top: 6px;
  font-size: 26px;
  color: #fff6d0;
}

.tower-list {
  display: grid;
  gap: 10px;
}

.option-toggle {
  display: grid;
  gap: 10px;
}

.tower-card {
  border: 3px solid #111728;
  background: rgba(255, 255, 255, 0.06);
  padding: 12px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}

.tower-card.active {
  outline: 3px solid var(--accent);
  background: rgba(243, 201, 105, 0.14);
}

.tower-card:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.1);
}

.option-chip {
  border: 3px solid #111728;
  background: rgba(255, 255, 255, 0.06);
  color: var(--text);
  padding: 12px;
  text-align: left;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease;
}

.option-chip strong,
.option-chip span {
  display: block;
}

.option-chip strong {
  margin-bottom: 6px;
  color: #fff2ba;
}

.option-chip span {
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.option-chip:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.1);
}

.option-chip.active {
  outline: 3px solid var(--accent);
  background: rgba(243, 201, 105, 0.14);
}

.tower-card h3 {
  margin-bottom: 8px;
}

.tower-card p {
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
}

.pixel-btn,
.quiz-option,
.icon-btn {
  border: 3px solid var(--border);
  box-shadow: 0 4px 0 #111728;
  background: #f4e7b9;
  color: #1a2031;
  cursor: pointer;
}

.pixel-btn {
  padding: 12px 14px;
  font-weight: 700;
  min-height: 48px;
}

.pixel-btn.primary {
  background: linear-gradient(180deg, #f6dc90 0%, #f2ba56 100%);
}

.pixel-btn.full-width {
  width: 100%;
}

.pixel-btn:disabled {
  cursor: not-allowed;
  opacity: 0.55;
}

.board-panel {
  padding: 12px;
}

#gameCanvas {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  display: block;
  background: linear-gradient(180deg, var(--sky) 0%, #78c6f0 50%, #72b86d 50%, #72b86d 100%);
  image-rendering: pixelated;
  border: 4px solid #152036;
  border-radius: 6px;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.08);
}

.board-footer {
  margin-top: 12px;
  display: flex;
  align-items: start;
  justify-content: space-between;
  gap: 16px;
}

.panel-toggle-bar {
  display: none;
  margin-top: 12px;
  gap: 10px;
}

.panel-toggle-btn {
  flex: 1;
}

.panel-toggle-btn.active {
  background: linear-gradient(180deg, #f6dc90 0%, #f2ba56 100%);
}

.panel-drawer-header {
  display: none;
  align-items: start;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 12px;
}

.panel-drawer-header h2 {
  margin-bottom: 0;
}

.panel-close {
  display: none;
}

.board-panel {
  position: relative;
}

.legend {
  display: grid;
  gap: 8px;
  color: var(--muted);
  font-size: 13px;
}

.swatch {
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-right: 8px;
  border: 2px solid var(--border);
  vertical-align: middle;
}

.swatch.path {
  background: var(--path);
}

.swatch.slot {
  background: var(--slot);
}

.swatch.enemy {
  background: var(--enemy);
}

.chapter-meta,
.event-log,
.chip-box {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.word-book {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
  gap: 10px;
  max-height: 540px;
  overflow: auto;
  padding-right: 4px;
  -webkit-overflow-scrolling: touch;
}

.chapter-badge,
.chip {
  border: 3px solid #121729;
  padding: 8px 10px;
  background: rgba(255, 255, 255, 0.06);
}

.chapter-card {
  border: 3px solid rgba(255, 223, 116, 0.45);
  background: linear-gradient(180deg, rgba(255, 223, 116, 0.16), rgba(255, 255, 255, 0.05));
  padding: 12px;
}

.chapter-card strong {
  display: block;
  margin-bottom: 6px;
  color: #fff5c8;
}

.chapter-card p {
  margin-bottom: 6px;
  color: var(--muted);
  line-height: 1.5;
}

.chip.medal {
  background: linear-gradient(180deg, rgba(255, 223, 116, 0.2), rgba(255, 255, 255, 0.08));
  border-color: rgba(255, 223, 116, 0.55);
}

.chip.highlight {
  background: linear-gradient(180deg, rgba(141, 217, 255, 0.18), rgba(255, 255, 255, 0.06));
  border-color: rgba(141, 217, 255, 0.45);
}

button.chapter-badge {
  appearance: none;
  color: inherit;
  text-align: left;
  font: inherit;
}

.chapter-stage {
  font-size: 12px;
  cursor: pointer;
  transition: transform 120ms ease, background 120ms ease, border-color 120ms ease;
}

.chapter-stage:hover {
  transform: translateY(-1px);
}

.chapter-stage.selected {
  box-shadow: inset 0 0 0 2px rgba(255, 236, 177, 0.8);
}

.chapter-stage.active {
  background: rgba(243, 201, 105, 0.18);
  border-color: #f3c969;
  color: #fff3c4;
}

.chapter-stage.completed {
  background: rgba(126, 199, 110, 0.16);
  border-color: rgba(126, 199, 110, 0.6);
  color: #d9ffd0;
}

.chapter-stage.upcoming {
  opacity: 0.82;
}

.chip {
  font-size: 13px;
}

.chip strong {
  color: #fff1b1;
}

.word-card {
  width: 100%;
  border: 3px solid #121729;
  padding: 10px;
  background: rgba(255, 255, 255, 0.06);
}

.word-card strong {
  display: block;
  margin-bottom: 4px;
  color: #fff2ba;
}

.word-card p {
  margin-bottom: 4px;
  color: var(--muted);
  font-size: 12px;
}

.word-card .word-index {
  color: var(--accent);
  font-size: 11px;
  letter-spacing: 0.06em;
}

.event-log {
  flex-direction: column;
  max-height: 220px;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
}

.log-item {
  padding: 8px 10px;
  background: rgba(0, 0, 0, 0.16);
  border-left: 4px solid var(--accent);
  font-size: 13px;
  line-height: 1.5;
}

.modal {
  position: fixed;
  inset: 0;
  display: grid;
  place-items: center;
  background: rgba(6, 9, 16, 0.72);
  padding:
    calc(20px + var(--safe-top))
    calc(20px + var(--safe-right))
    calc(20px + var(--safe-bottom))
    calc(20px + var(--safe-left));
}

.modal.hidden {
  display: none;
}

.panel-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(6, 9, 16, 0.62);
  opacity: 0;
  pointer-events: none;
  transition: opacity 160ms ease;
  z-index: 35;
}

.panel-backdrop.visible {
  opacity: 1;
  pointer-events: auto;
}

.modal-card {
  width: min(700px, 100%);
  background: linear-gradient(180deg, #314165 0%, #212c47 100%);
  border: 4px solid #0f1423;
  box-shadow: 0 8px 0 #111728;
  padding: 20px;
}

.modal-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: start;
}

.icon-btn {
  min-width: 44px;
  min-height: 44px;
  font-weight: 700;
}

.quiz-prompt {
  font-size: 24px;
  line-height: 1.5;
  color: #fff5c8;
}

.quiz-hint {
  margin-bottom: 16px;
  color: var(--muted);
}

.quiz-options {
  display: grid;
  gap: 10px;
}

.quiz-option {
  width: 100%;
  padding: 14px;
  text-align: left;
  font-weight: 700;
  font-size: 16px;
  min-height: 56px;
}

.quiz-feedback {
  min-height: 24px;
  margin-top: 14px;
  color: #a9f0a6;
}

.result-card {
  width: min(820px, 100%);
}

.branch-card {
  width: min(760px, 100%);
}

.intro-card {
  width: min(760px, 100%);
  background:
    linear-gradient(180deg, rgba(255, 223, 116, 0.16), transparent 18%),
    linear-gradient(180deg, #314165 0%, #212c47 100%);
}

.intro-actions {
  margin-top: 16px;
}

.branch-prompt {
  font-size: 18px;
  color: var(--text);
}

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

.branch-option {
  border: 3px solid #111728;
  box-shadow: 0 4px 0 #111728;
  background: rgba(255, 255, 255, 0.08);
  color: var(--text);
  padding: 14px;
  text-align: left;
  cursor: pointer;
}

.branch-option h3 {
  margin-bottom: 8px;
  color: #fff4c5;
}

.branch-option p {
  margin-bottom: 6px;
  color: var(--muted);
  font-size: 13px;
  line-height: 1.5;
}

.branch-option:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, 0.12);
}

.result-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 10px;
  margin-bottom: 18px;
}

.result-stat {
  border: 3px solid #111728;
  padding: 10px;
  background: rgba(255, 255, 255, 0.06);
}

.result-stat strong {
  display: block;
  margin-top: 6px;
  color: #fff5c8;
  font-size: 26px;
}

@media (max-width: 1180px), (min-width: 761px) and (any-pointer: coarse) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-areas: "board";
    gap: 12px;
  }

  .shell {
    padding:
      calc(10px + var(--safe-top))
      calc(10px + var(--safe-right))
      calc(10px + var(--safe-bottom))
      calc(10px + var(--safe-left));
  }

  .panel {
    padding: 12px;
  }

  .board-panel {
    min-width: 0;
  }

  .panel-toggle-bar {
    display: flex;
  }

  .board-footer {
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: start;
  }

  .panel-drawer-header {
    display: flex;
  }

  .panel-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
  }

  .left-panel,
  .right-panel {
    position: fixed;
    left: calc(10px + var(--safe-left));
    right: calc(10px + var(--safe-right));
    bottom: calc(10px + var(--safe-bottom));
    top: auto;
    max-height: min(62dvh, 640px);
    display: grid;
    grid-template-columns: 1fr;
    align-content: start;
    overflow: auto;
    -webkit-overflow-scrolling: touch;
    z-index: 40;
    opacity: 0;
    pointer-events: none;
    transform: translateY(calc(100% + 24px));
    transition: transform 180ms ease, opacity 180ms ease;
  }

  .left-panel.is-open,
  .right-panel.is-open {
    opacity: 1;
    pointer-events: auto;
    transform: translateY(0);
  }

  .word-book {
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    max-height: none;
  }

  .event-log {
    max-height: 220px;
  }

  h1 {
    font-size: clamp(24px, 3vw, 30px);
  }

  .stat-card strong {
    font-size: 22px;
  }

  .tower-card,
  .word-card,
  .chapter-badge,
  .chip,
  .log-item {
    padding: 9px 10px;
  }
}

@media (max-width: 1024px), (min-width: 761px) and (any-pointer: coarse) {
  .topbar {
    position: sticky;
    top: var(--safe-top);
    z-index: 20;
    padding: 10px 0;
    background: linear-gradient(180deg, rgba(18, 24, 43, 0.96), rgba(18, 24, 43, 0.82));
    backdrop-filter: blur(8px);
  }
}

@media (max-width: 820px) {
  .layout {
    grid-template-columns: 1fr;
    grid-template-areas: "board";
  }
}

@media (max-width: 820px) and (orientation: portrait), (min-width: 761px) and (any-pointer: coarse) and (orientation: portrait) {
  #gameCanvas {
    max-height: 58vh;
  }

  .board-footer {
    flex-direction: column;
    gap: 12px;
  }

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

  .topbar-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    width: 100%;
  }

  .panel-toggle-bar {
    grid-template-columns: 1fr 1fr;
    display: grid;
  }
}

@media (max-width: 760px) {
  .shell {
    padding:
      calc(8px + var(--safe-top))
      calc(8px + var(--safe-right))
      calc(10px + var(--safe-bottom))
      calc(8px + var(--safe-left));
  }

  .topbar {
    flex-direction: column;
    align-items: stretch;
    gap: 10px;
    margin-bottom: 10px;
    padding: 8px 0;
  }

  .eyebrow {
    display: none;
  }

  h1 {
    font-size: clamp(16px, 6vw, 22px);
    line-height: 1.2;
  }

  .topbar-actions {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px;
    width: 100%;
  }

  .topbar-actions .pixel-btn {
    min-height: 40px;
    padding: 8px 6px;
    font-size: 13px;
    box-shadow: 0 3px 0 #111728;
  }

  .board-footer {
    display: grid;
    grid-template-columns: 1fr;
    gap: 10px;
  }

  .board-footer h2 {
    margin-bottom: 8px;
  }

  .legend {
    display: flex;
    flex-wrap: wrap;
    gap: 10px 14px;
    font-size: 12px;
  }

  .legend span {
    display: inline-flex;
    align-items: center;
  }

  .panel-toggle-bar {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .panel-toggle-btn {
    min-height: 40px;
    padding: 8px 10px;
    font-size: 14px;
    box-shadow: 0 3px 0 #111728;
  }

  .left-panel,
  .right-panel {
    left: calc(8px + var(--safe-left));
    right: calc(8px + var(--safe-right));
    bottom: calc(8px + var(--safe-bottom));
    max-height: min(72dvh, 720px);
  }

  .left-panel section,
  .right-panel section {
    min-width: 0;
  }

  .word-book {
    grid-template-columns: 1fr 1fr;
  }

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

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

  .quiz-prompt {
    font-size: 20px;
  }

  .branch-options {
    grid-template-columns: 1fr;
  }

  .modal {
    padding:
      calc(8px + var(--safe-top))
      calc(8px + var(--safe-right))
      calc(8px + var(--safe-bottom))
      calc(8px + var(--safe-left));
  }

  .panel,
  .board-panel {
    padding: 10px;
  }
}

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

  #startWaveBtn {
    grid-column: 1 / -1;
  }

  .topbar-actions .pixel-btn {
    font-size: 14px;
  }

  #gameCanvas {
    border-width: 3px;
  }

  .panel-toggle-bar {
    grid-template-columns: 1fr 1fr;
  }

  .panel-toggle-btn {
    font-size: 13px;
  }

  .word-book {
    grid-template-columns: 1fr;
  }

  .legend {
    gap: 8px 12px;
  }
}