/* Penduline site: silk craft aesthetic with madder red and indigo accents. */
:root {
  --bg: #fbf8f5;
  --card: #ffffff;
  --ink: #22181c;
  --muted: #6b5860;
  --accent: #d64a5c;
  --accent-indigo: #4f4fa3;
  --accent-gold: #d4932a;
  --line: #ecdcdb;
  --wash: #f8eff0;
  --wash-indigo: #eef0f9;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #151114;
    --card: #1f181d;
    --ink: #f7eff3;
    --muted: #bfaab5;
    --accent: #e65a6d;
    --accent-indigo: #7878d6;
    --accent-gold: #f2ad41;
    --line: #382530;
    --wash: #2e1d25;
    --wash-indigo: #1e1f38;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 48px 16px 80px;
  background: var(--bg);
  color: var(--ink);
  font: 16px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
}
main { max-width: 900px; margin: 0 auto; }
.hero { text-align: center; margin-bottom: 40px; }
.icon {
  width: 112px; height: 112px; margin: 0 auto 14px; display: block;
  border-radius: 22.5%;
  filter: drop-shadow(0 12px 24px rgba(214, 74, 92, 0.22));
}
h1 { font-size: 34px; margin: 0 0 6px; letter-spacing: -0.4px; }
.tagline { color: var(--muted); margin: 0; font-size: 18px; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 26px 28px;
  margin-bottom: 20px;
}
h2 { font-size: 22px; margin: 0 0 12px; letter-spacing: -0.3px; }
h3 { font-size: 17px; margin: 22px 0 6px; }
p, li { color: var(--ink); }
p.note, li.note { color: var(--muted); }
ul { padding-left: 22px; }
li { margin: 6px 0; }
a { color: var(--accent); }
nav.links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 18px; }
nav.links a {
  text-decoration: none; font-weight: 500;
  border: 1px solid var(--line); background: var(--card);
  padding: 9px 16px; border-radius: 999px;
}
footer { text-align: center; color: var(--muted); font-size: 14px; margin-top: 36px; }
footer a { color: var(--muted); }

/* Interactive Kumihimo Studio Demo */
.penduline-stage {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 24px;
  padding: 24px;
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.05);
}
.studio-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.studio-tab-btn {
  font: inherit;
  font-size: 14px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--wash);
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s ease;
}
.studio-tab-btn:hover {
  color: var(--accent);
  border-color: var(--accent);
}
.studio-tab-btn.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
  box-shadow: 0 4px 12px rgba(214, 74, 92, 0.35);
}
.studio-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}
@media (max-width: 720px) {
  .studio-grid {
    grid-template-columns: 1fr;
  }
}
.disk-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  position: relative;
}
.disk-svg {
  width: 100%;
  max-width: 380px;
  height: auto;
  user-select: none;
  filter: drop-shadow(0 8px 24px rgba(0, 0, 0, 0.08));
}
.disk-bead {
  cursor: pointer;
  transition: transform 0.15s ease, filter 0.15s ease;
}
.disk-bead:hover {
  transform-origin: center;
  filter: brightness(1.15) drop-shadow(0 0 6px rgba(214, 74, 92, 0.6));
}
.step-guide-bar {
  margin-top: 14px;
  width: 100%;
  padding: 10px 16px;
  border-radius: 12px;
  background: var(--wash);
  border: 1px solid var(--line);
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13.5px;
  font-weight: 500;
}
.step-guide-bar strong {
  color: var(--accent);
}
.studio-sidebar {
  display: flex;
  flex-direction: column;
  gap: 16px;
}
.studio-panel {
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 16px;
  background: color-mix(in srgb, var(--accent) 3%, var(--card));
}
.studio-panel h4 {
  margin: 0 0 10px;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--muted);
  font-weight: 700;
}
.palette-swatches {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.swatch-btn {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.15);
  transition: transform 0.15s ease, border-color 0.15s ease;
  padding: 0;
}
.swatch-btn:hover {
  transform: scale(1.12);
}
.swatch-btn.active {
  border-color: var(--ink);
  transform: scale(1.15);
  box-shadow: 0 0 0 2px var(--card), 0 0 0 4px var(--accent);
}
.presets-list {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}
.preset-chip {
  font: inherit;
  font-size: 12.5px;
  font-weight: 600;
  padding: 5px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}
.preset-chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.braid-preview-box {
  display: flex;
  gap: 16px;
  align-items: center;
}
.braid-preview-canvas {
  width: 72px;
  height: 120px;
  border-radius: 10px;
  background: #110e11;
  box-shadow: inset 0 0 12px rgba(0, 0, 0, 0.4);
}
.chart-preview-svg {
  flex: 1;
  height: 120px;
  border-radius: 10px;
  background: var(--wash);
  border: 1px solid var(--line);
}
.controls-row {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 4px;
}
.btn-primary {
  font: inherit;
  font-size: 13.5px;
  font-weight: 650;
  padding: 8px 18px;
  border-radius: 999px;
  border: 0;
  background: linear-gradient(135deg, #d64a5c, #9e4c80);
  color: #fff;
  cursor: pointer;
  box-shadow: 0 4px 12px rgba(214, 74, 92, 0.28);
  transition: opacity 0.15s;
}
.btn-primary:hover {
  opacity: 0.92;
}
.btn-secondary {
  font: inherit;
  font-size: 13.5px;
  font-weight: 600;
  padding: 8px 16px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--ink);
  cursor: pointer;
}
.btn-secondary:hover {
  border-color: var(--accent);
}
.cut-list-note {
  font-size: 12.5px;
  color: var(--muted);
  margin-top: 4px;
  line-height: 1.4;
}