:root {
  --sketch-paper: rgba(244, 239, 228, 0.98);
  --sketch-ink: #121722;
  --sketch-line: rgba(18, 23, 34, 0.12);
}

.hero-secondary-btn {
  color: var(--text);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: none;
}

.section-nav,
.mobile-dock {
  overflow-x: auto;
  scrollbar-width: none;
}

.section-nav::-webkit-scrollbar,
.mobile-dock::-webkit-scrollbar {
  display: none;
}

.section-nav .tab-btn,
.mobile-dock .tab-btn {
  white-space: nowrap;
}

.sketch-stage {
  gap: 24px;
}

.sketch-header,
.sketch-target-actions,
.sketch-actions,
.sketch-script-tabs {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  align-items: center;
}

.sketch-header {
  justify-content: space-between;
  margin-bottom: 18px;
}

.sketch-script-tab,
.sketch-select-wrap select {
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.04);
  color: var(--text);
  padding: 10px 16px;
}

.sketch-script-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sketch-script-tab span {
  font-family: "Noto Serif JP", serif;
  font-size: 1rem;
  line-height: 1;
}

.sketch-script-tab.active {
  color: #111319;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  box-shadow: 0 12px 30px rgba(64, 224, 208, 0.18);
}

.sketch-select-wrap {
  display: grid;
  gap: 8px;
  color: var(--muted-strong);
  font-size: 0.84rem;
}

.sketch-practice-grid {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  gap: 18px;
}

.sketch-target-card,
.sketch-board-card,
.sketch-json-panel {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 24px;
  background: rgba(255, 255, 255, 0.03);
  padding: 18px;
}

.sketch-kicker {
  margin: 0 0 10px;
  font-size: 0.74rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.sketch-target-kana {
  font-family: "Noto Serif JP", serif;
  font-size: clamp(4rem, 10vw, 6.4rem);
  line-height: 1;
  margin-bottom: 8px;
}

.sketch-target-romaji {
  font-size: 1rem;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.18em;
  margin-bottom: 8px;
}

.sketch-target-meta {
  margin: 0 0 20px;
  color: var(--muted-strong);
}

.sketch-toolbar {
  display: flex;
  justify-content: space-between;
  gap: 14px;
  flex-wrap: wrap;
  align-items: center;
  margin-bottom: 16px;
}

.sketch-range-wrap {
  display: grid;
  gap: 8px;
  color: var(--muted-strong);
  font-size: 0.84rem;
  min-width: min(100%, 260px);
}

.sketch-range-wrap input {
  width: 100%;
}

.sketch-actions .sketch-guide-btn {
  border-color: rgba(64, 224, 208, 0.22);
  color: var(--accent);
}

.sketch-actions .sketch-guide-btn.active {
  background: rgba(64, 224, 208, 0.12);
  border-color: var(--accent);
}

.sketch-canvas-shell {
  position: relative;
  border-radius: 26px;
  overflow: hidden;
  background:
    linear-gradient(0deg, transparent 24%, var(--sketch-line) 25%, transparent 26%) center/100% 33.33%,
    linear-gradient(90deg, transparent 24%, rgba(18, 23, 34, 0.06) 25%, transparent 26%) center/33.33% 100%,
    var(--sketch-paper);
  min-height: 520px;
}

#sketchCanvas {
  width: 100%;
  height: 520px;
  display: block;
  touch-action: none;
  position: relative;
  z-index: 2;
  cursor: crosshair;
}

.sketch-guide {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  border-top: 1px dashed rgba(18, 23, 34, 0.18);
  z-index: 1;
  pointer-events: none;
}

.guide-1 { top: 33.33%; }
.guide-2 { top: 50%; }
.guide-3 { top: 66.66%; }

.compact {
  margin-bottom: 14px;
}

.sketch-json-output {
  margin: 0;
  min-height: 160px;
  border-radius: 18px;
  padding: 16px;
  background: rgba(9, 12, 18, 0.9);
  color: #d6f3ff;
  overflow: auto;
  font-size: 0.84rem;
  line-height: 1.7;
}

@media (max-width: 900px) {
  .sketch-practice-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .sketch-target-card,
  .sketch-board-card,
  .sketch-json-panel {
    padding: 16px;
    border-radius: 20px;
  }

  #sketchCanvas,
  .sketch-canvas-shell {
    min-height: 420px;
    height: 420px;
  }
}