/* ===================================================================
   LAYOUT.CSS — App shell, sidebar, form panel, preview panel
=================================================================== */

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
html { overflow-x: hidden; }
body {
  margin: 0;
  width: 100%;
  overflow-x: hidden;
  background: var(--bg-app);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: var(--fs-base);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-y: hidden;
}

#app-root {
  display: grid;
  grid-template-rows: 60px 1fr;
  height: 100vh;
  height: 100dvh;
  max-width: 100vw;
}

/* ---------- Topbar ---------- */
.topbar {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: 0 var(--space-5);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  z-index: 40;
  min-width: 0;
}
.topbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
  white-space: nowrap;
  flex: 0 0 auto;
}
.topbar__brand .brand-mark {
  width: 30px; height: 30px;
  border-radius: 9px;
  background: linear-gradient(145deg, var(--accent), var(--ink-900));
  display: flex; align-items: center; justify-content: center;
  color: #fff; font-family: var(--font-display); font-weight: 700; font-size: 15px;
  box-shadow: var(--shadow-sm);
}
.topbar__doctype { flex: 0 0 auto; }
.topbar__spacer { flex: 1; min-width: var(--space-2); }
.topbar__actions { display: flex; align-items: center; gap: var(--space-2); flex: 0 0 auto; }
.topbar__search { position: relative; width: 260px; max-width: 28vw; min-width: 0; flex: 0 1 260px; }
.topbar__menu-toggle { display: none; }

/* ---------- Main 3-pane grid ---------- */
.workspace {
  display: grid;
  grid-template-columns: 20% 30% 50%;
  height: 100%;
  min-height: 0;
  max-width: 100vw;
  overflow: hidden;
}
.workspace > * { min-width: 0; min-height: 0; }

/* ---------- Sidebar (20%) ---------- */
.sidebar {
  background: var(--bg-surface);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 220px;
}
.sidebar__search { padding: var(--space-3) var(--space-3) var(--space-2); }
.sidebar__scroll {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-2) var(--space-2) var(--space-6);
}
.sidebar__group { margin-top: var(--space-3); }
.sidebar__group-title {
  font-size: var(--fs-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  padding: var(--space-2) var(--space-3) 6px;
  font-weight: 600;
}
.sidebar__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  width: 100%;
  padding: 9px var(--space-3);
  border: none;
  background: transparent;
  border-radius: var(--r-md);
  color: var(--text-secondary);
  font-size: var(--fs-sm);
  font-family: var(--font-body);
  cursor: pointer;
  text-align: left;
  position: relative;
  transition: background var(--transition-fast), color var(--transition-fast);
}
.sidebar__item:hover { background: var(--bg-hover); color: var(--text-primary); }
.sidebar__item:focus-visible { outline: none; box-shadow: var(--shadow-focus); }
.sidebar__item.is-active {
  background: var(--bg-active);
  color: var(--accent);
  font-weight: 600;
}
.sidebar__item.is-active::before {
  content: '';
  position: absolute; left: -8px; top: 50%; transform: translateY(-50%);
  width: 3px; height: 60%; border-radius: var(--r-pill);
  background: var(--gold);
}
.sidebar__item-icon { flex: 0 0 auto; width: 18px; height: 18px; display: flex; }
.sidebar__item-icon svg { width: 100%; height: 100%; }
.sidebar__item-label { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.sidebar__item-ring { flex: 0 0 auto; }
.sidebar__footer {
  padding: var(--space-3);
  border-top: 1px solid var(--border-subtle);
  display: flex; gap: var(--space-2);
}

/* ---------- Form panel (30%) ---------- */
.form-panel {
  background: var(--bg-app);
  border-right: 1px solid var(--border-subtle);
  display: flex;
  flex-direction: column;
  min-height: 0;
  min-width: 300px;
}
.form-panel__header {
  padding: var(--space-4) var(--space-5) var(--space-3);
  border-bottom: 1px solid var(--border-subtle);
  background: var(--bg-surface);
}
.form-panel__title-row { display: flex; align-items: center; justify-content: space-between; gap: var(--space-3); }
.form-panel__title {
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 600;
  letter-spacing: -0.01em;
}
.form-panel__subtitle { color: var(--text-secondary); font-size: var(--fs-sm); margin-top: 2px; }
.form-panel__scroll {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-5);
}
.form-panel__footer {
  padding: var(--space-3) var(--space-5);
  border-top: 1px solid var(--border-subtle);
  background: var(--bg-surface);
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: var(--space-3);
}

/* ---------- Preview panel (50%) ---------- */
.preview-panel {
  background: var(--bg-sunken);
  display: flex;
  flex-direction: column;
  min-height: 0;
}
.preview-panel__toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border-subtle);
  flex-wrap: wrap;
}
.preview-panel__toolbar .spacer { flex: 1; }
.preview-panel__stage {
  flex: 1;
  overflow: auto;
  -webkit-overflow-scrolling: touch;
  padding: var(--space-7) var(--space-6);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-6);
}

/* ---------- Section card (generic reusable block) ---------- */
.card {
  background: var(--bg-surface);
  border: 1px solid var(--border-subtle);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-sm);
}

/* ---------- Scrollbars ---------- */
::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: var(--r-pill); }
::-webkit-scrollbar-thumb:hover { background: var(--text-tertiary); }

/* ---------- Print staging area (populated at export time, kept off-screen until @media print) ---------- */
#print-root {
  position: fixed;
  left: -9999px;
  top: 0;
  width: 816px;
}
.drawer-overlay {
  position: fixed; inset: 0;
  background: rgba(12, 15, 30, 0.5);
  z-index: 60;
  display: none;
}
.drawer-overlay.is-open { display: block; }