html,
body {
  margin: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  color: #e5e7eb;
  background: #111318;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

button,
input,
select,
textarea {
  font: inherit;
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(260px, 320px) minmax(0, 1fr);
  width: 100vw;
  height: 100vh;
}

.controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
  min-width: 0;
  padding: 16px;
  overflow: auto;
  background: #1a1d24;
  border-right: 1px solid #303642;
}

.controls label {
  font-size: 13px;
  color: #aeb6c3;
}

.check-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.check-row input {
  min-height: 0;
}

.controls select,
.controls textarea,
.controls input {
  min-width: 0;
  color: #f3f4f6;
  background: #0f1117;
  border: 1px solid #3a4352;
  border-radius: 6px;
}

.controls select,
.controls input {
  min-height: 34px;
  padding: 0 8px;
}

.controls textarea {
  min-height: 210px;
  padding: 10px;
  width: 100%;
  box-sizing: border-box;
  resize: vertical;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  line-height: 1.45;
}

.controls button {
  min-height: 34px;
  color: #f8fafc;
  background: #315d68;
  border: 1px solid #497985;
  border-radius: 6px;
  cursor: pointer;
}

.controls button:hover {
  background: #3b707d;
}

.color-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 42px;
  align-items: center;
  gap: 8px;
}

.color-row input[type="color"] {
  width: 42px;
  min-height: 28px;
  padding: 2px;
}

.viewport {
  position: relative;
  min-width: 0;
  min-height: 0;
  background: #000;
}

.fractal-canvas {
  display: block;
  width: 100%;
  height: 100%;
  outline: none;
  touch-action: none;
}

.unsupported {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  text-align: center;
  background: #111318;
}

.unsupported h2 {
  margin: 0 0 8px;
  font-size: 22px;
}

.unsupported p {
  margin: 0;
  color: #b9c2cf;
}

.hidden,
[hidden] {
  display: none !important;
}

@media (max-width: 760px) {
  .app-shell {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
  }

  .viewport { position: fixed; inset: 0; z-index: 0; }

  .controls {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    border-right: none;
    border-top: 1px solid #303642;
    border-radius: 12px 12px 0 0;
    max-height: 80vh;
    transform: translateY(calc(100% - 52px));
    transition: transform 0.25s ease;
    z-index: 100;
    display: flex;
    flex-direction: column;
    overflow: hidden;
  }

  .controls.sheet-open { transform: translateY(0); }

  .sheet-handle-area {
    flex-shrink: 0;
    padding: 10px 14px 6px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 4px;
    cursor: pointer;
    touch-action: none;
    user-select: none;
  }

  .sheet-handle {
    width: 36px;
    height: 4px;
    border-radius: 2px;
    background: #4a5568;
    flex-shrink: 0;
  }

  .sheet-preset-name {
    font-size: 12px;
    color: #7a8899;
  }

  .controls-scroll {
    flex: 1;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

}

@media (min-width: 761px) {
  .sheet-handle-area { display: none; }
  .controls-scroll { display: contents; }
}

/* ── Disclosure sections ── */
.disclosure {
  border: 1px solid #2d3548;
  border-radius: 7px;
  /* No overflow:hidden — it clamps flex-item height inside a fixed-height
     flex container, causing the card to stop short of its content. Corners
     are handled by per-element border-radius instead. */
}

/* Higher specificity (.controls .disclosure-header = 0,2,0)
   overrides the global .controls button rule (0,1,1). */
.controls .disclosure-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 12px;
  cursor: pointer;
  user-select: none;
  color: #8fa3b8;
  font-weight: 600;
  font-size: 11px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: #1e2333;
  border: none;
  border-radius: 7px 7px 0 0;
  min-height: 0;
  width: 100%;
  text-align: left;
}

.controls .disclosure-header:hover { background: #232840; }

/* When closed the header rounds all four corners */
.controls .disclosure-header:not(:has(+ .disclosure-body:not(.hidden))) {
  border-radius: 7px;
}

.disclosure-chevron {
  color: #5a6478;
  font-size: 9px;
  display: inline-block;
  transition: transform 0.15s;
}

.disclosure-chevron.open { transform: rotate(90deg); }

.disclosure-body {
  padding: 10px 12px 13px;
  display: flex;
  flex-direction: column;
  gap: 9px;
  border-top: 1px solid #2d3548;
  background: #151820;
  border-radius: 0 0 7px 7px;
}

/* ── Segmented toggle ── */
.seg-toggle {
  display: flex;
  border: 1px solid #3a4352;
  border-radius: 5px;
  overflow: hidden;
}

.seg-toggle button {
  flex: 1;
  padding: 5px 0;
  font-size: 12px;
  font-weight: 600;
  color: #7a8899;
  background: #0f1117;
  border: none;
  border-radius: 0;
  cursor: pointer;
  min-height: 0;
}

.seg-toggle button:not(:first-child) { border-left: 1px solid #3a4352; }
.seg-toggle button.seg-active { background: #315d68; color: #e5e7eb; cursor: default; }
.seg-toggle button:disabled:not(.seg-active) { opacity: 0.35; cursor: not-allowed; }
.seg-toggle button.seg-active:disabled { cursor: default; opacity: 1; }

/* ── Disabled interactive controls ── */
.controls button:disabled,
.controls input:disabled,
.controls select:disabled,
.controls textarea:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.spinner-btn:disabled,
.spinner-btn:disabled:hover {
  opacity: 0.4;
  background: #252932;
  color: #aeb6c3;
  cursor: not-allowed;
}

/* ── Spinner ── */
.spinner {
  display: flex;
  align-items: center;
  border: 1px solid #3a4352;
  border-radius: 5px;
  overflow: hidden;
  background: #0f1117;
}

.spinner-btn {
  width: 28px;
  height: 30px;
  background: #252932;
  border: none;
  color: #aeb6c3;
  font-size: 16px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  padding: 0;
  min-height: 0;
}

.spinner-btn:hover { background: #315d68; color: #fff; }

.spinner-input {
  flex: 1;
  min-width: 0;
  height: 30px;
  background: transparent;
  border: none;
  border-left: 1px solid #3a4352;
  border-right: 1px solid #3a4352;
  color: #f3f4f6;
  text-align: center;
  font-size: 13px;
  padding: 0 4px;
}

.spinner-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.spinner-label {
  flex: 0 0 126px;
  font-size: 12px;
  color: #aeb6c3;
}

/* ── Section label ── */
.section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #7a8899;
}

.section-divider {
  border: none;
  border-top: 1px solid #252a35;
  margin: 2px 0;
}

/* ── Grammar table ── */
.grammar-table { width: 100%; border-collapse: collapse; }

.grammar-table td { padding: 2px 3px; vertical-align: middle; }
.grammar-table td.g-symbol { width: 72px; }
.grammar-table td.g-delete { width: 24px; text-align: center; }

.grammar-axiom-label {
  display: block;
  text-align: center;
  background: #0f1117;
  border: 1px solid #3a4352;
  border-radius: 4px;
  color: #7ab8c8;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  padding: 4px 0;
}

.grammar-combo,
.grammar-rhs {
  width: 100%;
  background: #0f1117;
  border: 1px solid #3a4352;
  border-radius: 4px;
  color: #f3f4f6;
  padding: 4px 6px;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 12px;
  box-sizing: border-box;
}

.grammar-delete-btn {
  background: none;
  border: none;
  color: #5a6478;
  cursor: pointer;
  font-size: 16px;
  line-height: 1;
  padding: 2px 3px;
  border-radius: 3px;
  min-height: 0;
}

.grammar-delete-btn:hover { color: #f87171; background: #2a1a1a; }

/* ── Top bar additions ── */
.preset-row { display: flex; gap: 5px; align-items: center; }
.preset-row select { flex: 1; min-width: 0; }

.preset-actions { display: flex; flex-direction: column; gap: 5px; margin-top: 4px; }

.btn-row { display: flex; gap: 5px; }
.btn-row button { flex: 1; white-space: nowrap; }
/* Tooltip wrapper divs inside btn-row — must behave like flex items */
.btn-row > div { flex: 1; display: flex; }
.btn-row > div > button { flex: 1; white-space: nowrap; }

.rename-input { flex: 1; }

.inline-status { display: block; font-size: 12px; min-height: 16px; flex-shrink: 0; }
.inline-status.error { color: #ff7b7b; }
.inline-status.warning { color: #d4a840; }

/* ── Disclosure badge (amber dot for dirty state) ── */
.disclosure-badge {
  color: #d4a840;
  font-size: 9px;
  margin-left: 6px;
  vertical-align: middle;
}