/* ============================================================
   Mercure Stories — Storybook-lite layout
   Two-pane app: sidebar (left) + main (canvas + panel).
   ============================================================ */

.st-body {
  margin: 0;
  background: var(--surface-page);
  color: var(--text-primary);
  font-family: var(--type-display);
  font-size: var(--mc-type-body);
  -webkit-font-smoothing: antialiased;
  display: grid;
  grid-template-columns: 280px 1fr;
  min-height: 100vh;
  overflow: hidden;
}


/* ── SIDEBAR ─────────────────────────────────────────── */
.st-sidebar {
  display: flex;
  flex-direction: column;
  background: var(--surface-alt);
  border-right: 1px solid var(--border-subtle);
  min-height: 100vh;
  max-height: 100vh;
}
.st-sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--mc-space-3);
  padding: var(--mc-space-5) var(--mc-space-5);
  border-bottom: 1px solid var(--border-subtle);
}
.st-brand {
  display: inline-flex;
  align-items: center;
  gap: var(--mc-space-3);
  color: var(--text-primary);
}
.st-brand__m {
  width: 22px;
  height: auto;
  fill: var(--brand-mark);
}
.st-brand__caps {
  font-family: var(--type-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: var(--mc-tracking-wide-m);
  text-transform: uppercase;
  color: var(--text-primary);
}

.st-search {
  margin: var(--mc-space-4) var(--mc-space-5) var(--mc-space-3);
  padding: 10px 14px;
  background: var(--surface-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--mc-radius-md);
  color: var(--text-primary);
  font-family: var(--type-display);
  font-size: var(--mc-type-small);
  outline: none;
}
.st-search::placeholder { color: var(--text-muted); }
.st-search:focus { border-color: var(--action-primary); }

.st-tree {
  flex: 1;
  overflow-y: auto;
  padding: 0 var(--mc-space-3) var(--mc-space-4);
}
.st-tree__cat {
  margin-bottom: var(--mc-space-4);
}
.st-tree__head {
  display: block;
  padding: var(--mc-space-3) var(--mc-space-3) var(--mc-space-2);
  font-family: var(--type-mono);
  font-size: 10px;
  letter-spacing: var(--mc-tracking-wide-m);
  text-transform: uppercase;
  color: var(--text-muted);
}
.st-tree__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
}
.st-tree__item {
  width: 100%;
  display: flex;
  align-items: center;
  gap: var(--mc-space-3);
  padding: 8px var(--mc-space-3);
  border-radius: var(--mc-radius-xs);
  background: transparent;
  border: 0;
  color: var(--text-body);
  font-family: var(--type-display);
  font-size: var(--mc-type-small);
  text-align: left;
  cursor: pointer;
  transition:
    background var(--mc-dur-micro) var(--mc-ease),
    color var(--mc-dur-micro) var(--mc-ease);
}
.st-tree__item:hover {
  background: var(--surface-glass-hover);
  color: var(--text-primary);
}
.st-tree__item.is-active {
  background: rgba(107, 124, 255, 0.12);
  color: var(--text-primary);
}
.st-tree__dot {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--text-muted);
  transition: background var(--mc-dur-micro) var(--mc-ease);
}
.st-tree__item:hover .st-tree__dot {
  background: var(--brand-mark);
}
.st-tree__item.is-active .st-tree__dot {
  background: var(--action-primary);
  box-shadow: 0 0 8px var(--signature-glow);
}

.st-sidebar__foot {
  padding: var(--mc-space-4) var(--mc-space-5);
  border-top: 1px solid var(--border-subtle);
}


/* ── MAIN ────────────────────────────────────────────── */
.st-main {
  display: grid;
  grid-template-rows: auto 1fr 280px;
  min-height: 100vh;
  max-height: 100vh;
  overflow: hidden;
}

/* Toolbar */
.st-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--mc-space-4);
  padding: var(--mc-space-5) var(--mc-space-7);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--surface-page);
}
.st-toolbar__title {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.st-toolbar__h1 {
  margin: 0;
  font-family: var(--type-display);
  font-weight: 500;
  font-size: 22px;
  letter-spacing: var(--mc-tracking-tight-m);
  color: var(--text-primary);
}
.st-toolbar__actions {
  display: inline-flex;
  gap: var(--mc-space-3);
}
.st-bg-btn .mc-btn__label::after {
  content: " · " attr(data-bg);
}

/* Canvas — where the story renders */
.st-canvas {
  position: relative;
  overflow: auto;
  background:
    linear-gradient(45deg, rgba(255,255,255,0.018) 25%, transparent 25%, transparent 75%, rgba(255,255,255,0.018) 75%),
    linear-gradient(45deg, rgba(255,255,255,0.018) 25%, transparent 25%, transparent 75%, rgba(255,255,255,0.018) 75%);
  background-position: 0 0, 12px 12px;
  background-size: 24px 24px;
  background-color: var(--surface-alt);
}
[data-theme="light"] .st-canvas {
  background:
    linear-gradient(45deg, rgba(10,11,16,0.02) 25%, transparent 25%, transparent 75%, rgba(10,11,16,0.02) 75%),
    linear-gradient(45deg, rgba(10,11,16,0.02) 25%, transparent 25%, transparent 75%, rgba(10,11,16,0.02) 75%);
  background-position: 0 0, 12px 12px;
  background-size: 24px 24px;
  background-color: var(--surface-alt);
}
.st-canvas[data-bg="radial"] {
  background:
    radial-gradient(900px 500px at 25% 30%, rgba(107,124,255,0.12), transparent 60%),
    radial-gradient(700px 400px at 80% 70%, rgba(184,140,255,0.10), transparent 60%);
  background-color: var(--surface-page);
}
.st-canvas__inner {
  min-height: 100%;
  display: grid;
  place-items: center;
  padding: var(--mc-space-9);
}
.st-empty {
  font-family: var(--type-mono);
  font-size: var(--mc-type-small);
  color: var(--text-muted);
}

/* Panel — knobs / code / args */
.st-panel {
  display: flex;
  flex-direction: column;
  background: var(--surface-page);
  border-top: 1px solid var(--border-subtle);
  overflow: hidden;
}
.st-panel__tabs {
  display: flex;
  gap: 2px;
  padding: 0 var(--mc-space-7);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--surface-alt);
}
.st-tab {
  padding: 12px var(--mc-space-4);
  background: transparent;
  border: 0;
  color: var(--text-muted);
  font-family: var(--type-mono);
  font-size: 11px;
  letter-spacing: var(--mc-tracking-wide-s);
  text-transform: uppercase;
  cursor: pointer;
  position: relative;
  transition: color var(--mc-dur-micro) var(--mc-ease);
}
.st-tab:hover { color: var(--text-primary); }
.st-tab.is-active {
  color: var(--text-primary);
}
.st-tab.is-active::after {
  content: "";
  position: absolute;
  left: var(--mc-space-4); right: var(--mc-space-4);
  bottom: -1px;
  height: 2px;
  background: var(--action-primary);
  box-shadow: 0 0 12px var(--signature-glow);
  border-radius: 2px;
}
.st-panel__body {
  flex: 1;
  overflow: auto;
}
.st-tabpanel {
  display: none;
  padding: var(--mc-space-5) var(--mc-space-7);
}
.st-tabpanel.is-active { display: block; }


/* Knobs grid */
.st-knobs {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: var(--mc-space-5);
}
.st-knob {
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.st-knob__seg {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 2px;
  padding: 3px;
  background: var(--surface-glass);
  border: 1px solid var(--border-subtle);
  border-radius: var(--mc-radius-md);
}
.st-knob__opt {
  padding: 6px 10px;
  background: transparent;
  border: 0;
  border-radius: 6px;
  color: var(--text-muted);
  font-family: var(--type-mono);
  font-size: 11px;
  letter-spacing: var(--mc-tracking-wide-s);
  text-transform: lowercase;
  cursor: pointer;
  transition: background var(--mc-dur-micro) var(--mc-ease),
              color var(--mc-dur-micro) var(--mc-ease);
}
.st-knob__opt:hover { color: var(--text-primary); }
.st-knob__opt.is-on {
  background: var(--action-primary);
  color: var(--text-on-accent);
  box-shadow: 0 0 12px var(--signature-glow);
}
.st-knob__num { max-width: 120px; padding: 10px 12px; }


/* Code panel */
.st-code {
  display: block;
  white-space: pre;
  font-family: var(--type-mono);
  font-size: 12px;
  line-height: 1.55;
  color: var(--text-body);
  padding: var(--mc-space-4);
  background: var(--surface-card);
  border: 1px solid var(--border-subtle);
  border-radius: var(--mc-radius-md);
  overflow-x: auto;
}


/* Responsive — collapse sidebar below 900px */
@media (max-width: 900px) {
  .st-body {
    grid-template-columns: 1fr;
  }
  .st-sidebar {
    position: fixed;
    inset: 0;
    z-index: 80;
    transform: translateX(-100%);
    transition: transform 0.3s var(--mc-ease-out);
  }
  .st-sidebar.is-open { transform: none; }
  .st-main {
    grid-template-rows: auto 1fr 320px;
  }
}