.chc-page {
  display: flex;
  flex-direction: column;
  min-height: 100dvh;
  background: var(--bg);
  color: var(--ink);
}

.chc-topbar {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  background: var(--surface);
}

.chc-back-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: var(--fs-20);
  cursor: pointer;
  padding: 0 4px;
  line-height: 1;
  flex-shrink: 0;
}

.chc-name-input {
  flex: 1;
  min-width: 0;
  font-family: var(--font-sans);
  font-size: var(--fs-15);
  font-weight: 600;
  color: var(--ink);
  background: var(--surface2);
  border: 1.5px solid var(--accent);
  border-radius: var(--radius-lg);
  outline: none;
  padding: 5px 10px;
}

.chc-content {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: 16px;
  max-width: 520px;
  width: 100%;
}

.chc-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.chc-list-label {
  font-family: var(--font-sans);
  font-size: var(--fs-10);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--ink-mid);
}

/* ── Flat / Round toggle ── */

.chc-mode-toggle {
  display: flex;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  width: fit-content;
}

.chc-mode-btn {
  background: none;
  border: none;
  padding: 7px 20px;
  font-family: var(--font-sans);
  font-size: var(--fs-12);
  font-weight: 500;
  color: var(--ink-mid);
  cursor: pointer;
}
.chc-mode-btn:not(:first-child) { border-left: 1px solid var(--border); }
.chc-mode-btn-active { background: var(--accent); color: var(--bg); font-weight: 600; }

.chc-mode-hint {
  font-family: var(--font-sans);
  font-size: var(--fs-12);
  color: var(--ink-mid);
  line-height: 1.45;
  margin: 0;
}

/* ── Horizontal order preview ── */

.chc-order-preview {
  display: flex;
  align-items: center;
  gap: 6px;
  overflow-x: auto;
  padding: 10px 12px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  min-height: 44px;
  scrollbar-width: none;
}
.chc-order-preview::-webkit-scrollbar { display: none; }

.chc-order-chip {
  font-family: var(--font-sans);
  font-size: var(--fs-12);
  font-weight: 600;
  color: var(--accent);
  background: color-mix(in srgb, var(--accent) 10%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--accent) 35%, transparent);
  border-radius: var(--radius-md);
  padding: 3px 9px;
  white-space: nowrap;
  flex-shrink: 0;
}

.chc-order-arrow {
  font-size: var(--fs-14);
  color: var(--ink-light);
  flex-shrink: 0;
}

.chc-order-empty {
  font-family: var(--font-sans);
  font-size: var(--fs-12);
  color: var(--ink-light);
  font-style: italic;
}

/* ── Palette — every source chart, tap to append to the sequence ── */

.chc-palette {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.chc-palette-item {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 2px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 6px 10px;
  cursor: pointer;
  text-align: left;
}
.chc-palette-item:hover { border-color: var(--accent); background: color-mix(in srgb, var(--accent) 8%, var(--surface)); }

/* ── Chart list (sequence being built) ── */

.chc-chart-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.chc-chart-row {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: var(--surface);
  transition: opacity 0.15s, border-color 0.15s;
}

.chc-chart-row-selected { border-color: var(--accent); }

.chc-chain-pos {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  color: var(--accent);
  font-variant-numeric: tabular-nums;
  width: 16px;
  flex-shrink: 0;
  text-align: center;
}

.chc-chart-info {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 2px;
  min-width: 0;
}

.chc-chart-name {
  font-family: var(--font-sans);
  font-size: var(--fs-12);
  font-weight: 600;
  color: var(--ink);
}

.chc-chart-meta {
  font-family: var(--font-sans);
  font-size: var(--fs-10);
  color: var(--ink-mid);
}

.chc-move-buttons {
  display: flex;
  flex-direction: column;
  gap: 2px;
  flex-shrink: 0;
}

.chc-move-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--ink-mid);
  font-size: var(--fs-10);
  width: 24px;
  height: 20px;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.chc-move-btn:hover:not(:disabled) { border-color: var(--accent); color: var(--accent); }
.chc-move-btn:disabled { opacity: 0.25; cursor: not-allowed; }

.chc-remove-btn {
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--ink-mid);
  font-size: var(--fs-14);
  width: 24px;
  height: 24px;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.chc-remove-btn:hover { border-color: var(--danger); color: var(--danger); }

.chc-hint {
  font-family: var(--font-sans);
  font-size: var(--fs-12);
  color: var(--ink-light);
  font-style: italic;
  margin: 0;
}

.chc-actions { padding-top: 4px; }

.chc-chain-btn {
  width: 100%;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius-xl);
  padding: 12px 20px;
  font-family: var(--font-sans);
  font-size: var(--fs-14);
  font-weight: 600;
  cursor: pointer;
  text-align: center;
}
.chc-chain-btn:hover:not(:disabled) { filter: brightness(1.08); }
.chc-chain-btn:disabled { opacity: 0.4; cursor: not-allowed; }