/* ============================================================
   APP SHELL — Prompt Helper
   Left sidebar + top bar (Prompt Cowboy / GeneratePrompt.net pattern)
   Loaded AFTER site.css so it can override tokens and add shell.
   ============================================================ */

:root {
  /* Shell-specific tokens only. The colour palette is owned by
     site.css so that every page shares one source of truth. */
  --sidebar-w: 248px;
  --sidebar-w-collapsed: 68px;
  --topbar-h: 56px;
  --shell-max: 1180px;
  --bg-shell: var(--bg);
}

/* ===== DARK MODE =====
   The palette lives in site.css now. shell.css only keeps the
   shell-specific surface, so the two files cannot drift. */
html[data-theme="dark"] {
  --bg-sidebar: #0D0D0C;
}

/* ===== SHELL LAYOUT ===== */
.app-shell { min-height: 100vh; }

.sidebar {
  position: fixed;
  top: 0; left: 0; bottom: 0;
  width: var(--sidebar-w);
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  z-index: var(--z-drawer-side);
  transition: width var(--transition-base), transform var(--transition-base);
  overflow: hidden;
}
body.sidebar-collapsed .sidebar { width: var(--sidebar-w-collapsed); }
body.sidebar-collapsed .sidebar .sb-label,
body.sidebar-collapsed .sidebar .sb-section,
body.sidebar-collapsed .sidebar .sb-badge { display: none; }
body.sidebar-collapsed .sidebar .sb-link { justify-content: center; padding-left: 0; padding-right: 0; }

.sb-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  height: var(--topbar-h);
  padding: 0 var(--space-4);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.sb-logo {
  width: 26px; height: 26px;
  flex-shrink: 0;
  border-radius: 7px;
  background: var(--accent);
  color: var(--accent-fg);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.75rem; font-weight: 800; letter-spacing: -0.02em;
}
.sb-brand-name {
  font-family: 'Libre Baskerville', serif;
  font-weight: 700;
  font-size: 0.9375rem;
  white-space: nowrap;
  color: var(--text);
}
.sb-collapse {
  margin-left: auto;
  width: 26px; height: 26px;
  display: flex; align-items: center; justify-content: center;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.85rem;
  transition: all var(--transition-fast);
}
.sb-collapse:hover { color: var(--text); border-color: var(--border-strong); background: var(--bg-card); }

.sb-nav { flex: 1; overflow-y: auto; padding: var(--space-4) var(--space-3); }
.sb-section {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--muted-light);
  padding: var(--space-4) var(--space-3) var(--space-2);
  white-space: nowrap;
}
.sb-section:first-child { padding-top: 0; }
.sb-link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-size: 0.875rem;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
  border: none;
  background: transparent;
  width: 100%;
  text-align: left;
  font-family: inherit;
  transition: background var(--transition-fast), color var(--transition-fast);
  white-space: nowrap;
}
.sb-link:hover { background: var(--bg-soft); color: var(--text); }
.sb-link.active { background: var(--accent); color: var(--accent-fg); font-weight: 600; }
.sb-icon {
  width: 18px; flex-shrink: 0;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.95rem;
  line-height: 1;
}
.sb-badge {
  margin-left: auto;
  font-size: 0.65rem;
  font-weight: 700;
  padding: 1px 7px;
  border-radius: 999px;
  background: var(--accent-2);
  color: var(--on-accent-2);
  white-space: nowrap;
}
.sb-foot {
  padding: var(--space-3);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}
.sb-foot .btn { width: 100%; justify-content: center; }
.sb-foot-note { font-size: 0.7rem; color: var(--muted-light); margin-top: var(--space-2); text-align: center; line-height: 1.4; }

/* ===== MAIN COLUMN ===== */
.app-main {
  margin-left: var(--sidebar-w);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  transition: margin-left var(--transition-base);
}
body.sidebar-collapsed .app-main { margin-left: var(--sidebar-w-collapsed); }

.topbar {
  position: sticky;
  top: 0;
  z-index: var(--z-nav);
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-5);
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(16px) saturate(180%);
  -webkit-backdrop-filter: blur(16px) saturate(180%);
  border-bottom: 1px solid var(--border);
}
.tb-menu {
  display: none;
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: transparent;
  color: var(--text);
  cursor: pointer;
  align-items: center; justify-content: center;
  font-size: 1rem;
}
.tb-search { position: relative; flex: 1; max-width: 420px; }
.tb-search input {
  width: 100%;
  height: 34px;
  padding: 0 var(--space-3) 0 var(--space-8);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.875rem;
  font-family: inherit;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.tb-search input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.tb-search::before {
  content: "\1F50D";
  position: absolute;
  left: 10px; top: 50%;
  transform: translateY(-50%);
  font-size: 0.8rem;
  opacity: 0.5;
  pointer-events: none;
}
.tb-spacer { flex: 1; }
.tb-link { font-size: 0.875rem; font-weight: 500; color: var(--muted); text-decoration: none; white-space: nowrap; }
.tb-link:hover { color: var(--text); }
.tb-icon-btn {
  width: 32px; height: 32px;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  background: transparent;
  color: var(--muted);
  cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.95rem;
  transition: all var(--transition-fast);
}
.tb-icon-btn:hover { background: var(--bg-soft); color: var(--text); border-color: var(--border); }
.tb-cta {
  height: 32px;
  padding: 0 var(--space-4);
  border-radius: var(--radius-sm);
  background: var(--accent);
  color: var(--accent-fg);
  border: 1px solid var(--accent);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  text-decoration: none;
  display: inline-flex; align-items: center;
  transition: background var(--transition-fast);
}
.tb-cta:hover { background: var(--accent-dark); }

.shell-content {
  flex: 1;
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-16);
}

/* ===== PAGE HEADER ===== */
.page-head { margin-bottom: var(--space-6); }
.page-head h1 {
  font-size: clamp(1.75rem, 3.4vw, 2.5rem);
  margin-bottom: var(--space-2);
}
.page-head p { font-size: 1rem; max-width: 620px; }

/* ===== GENERATOR ===== */
.gen-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 292px;
  gap: var(--space-5);
  align-items: start;
  margin-bottom: var(--space-12);
}
.gen-main { min-width: 0; }
.gen-panel {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  box-shadow: var(--shadow-xs);
}

.gen-tabs {
  display: inline-flex;
  gap: 2px;
  margin-bottom: var(--space-4);
  background: var(--bg-soft);
  border-radius: var(--radius-sm);
  padding: 3px;
  border: 1px solid var(--border);
}
.gen-tabs .mode-tab { padding: var(--space-2) var(--space-4); font-size: 0.8125rem; }

.gen-field-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: var(--space-2);
}
.gen-input {
  width: 100%;
  min-height: 118px;
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text);
  font-size: 1rem;
  font-family: inherit;
  resize: vertical;
  line-height: 1.6;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.gen-input:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.gen-input::placeholder { color: var(--muted-light); }

.gen-toolbar {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
  margin-top: var(--space-3);
}
.gen-toolbar .select-wrap { position: relative; display: inline-flex; align-items: center; }
.gen-toolbar select {
  height: 34px;
  padding: 0 28px 0 var(--space-3);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  color: var(--text);
  font-size: 0.8125rem;
  font-family: inherit;
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12'%3E%3Cpath fill='%236B6962' d='M3 4.5L6 7.5L9 4.5'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.gen-toolbar select:focus { outline: none; border-color: var(--accent); box-shadow: 0 0 0 3px var(--accent-glow); }
.gen-toolbar .toggle { padding: var(--space-1) var(--space-3); height: 34px; font-size: 0.8125rem; }

.gen-submit-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-4);
  flex-wrap: wrap;
}
.gen-submit {
  height: 42px;
  padding: 0 var(--space-6);
  border-radius: var(--radius-sm);
  background: var(--accent-2);
  border: 1px solid var(--accent-2);
  color: var(--on-accent-2);
  font-size: 0.9375rem;
  font-weight: 700;
  cursor: pointer;
  font-family: inherit;
  display: inline-flex; align-items: center; gap: var(--space-2);
  transition: background var(--transition-fast), transform var(--transition-fast);
}
.gen-submit:hover { background: var(--accent-2-dark); transform: translateY(-1px); }
.gen-submit:disabled { opacity: 0.5; cursor: not-allowed; transform: none; }

.gen-output {
  margin-top: var(--space-4);
  padding: var(--space-4);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-input);
  min-height: 110px;
  font-size: 0.9375rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}
.gen-output.empty { color: var(--muted); font-style: italic; }
.gen-output.has-content { border-color: var(--accent-2); }

/* ===== RIGHT RAIL ===== */
.rail { display: flex; flex-direction: column; gap: var(--space-4); position: sticky; top: calc(var(--topbar-h) + var(--space-5)); }
.rail-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow-xs);
}
.rail-card h3 {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
  margin-bottom: var(--space-3);
  font-family: 'Inter', sans-serif;
}
.rail-card .btn { width: 100%; justify-content: center; }
.rail-card .btn + .btn { margin-top: var(--space-2); }
.rail-stat { display: flex; justify-content: space-between; font-size: 0.8125rem; color: var(--muted); margin-bottom: var(--space-2); }
.rail-stat b { color: var(--text); font-weight: 600; }
.rail-row { display: flex; align-items: center; justify-content: space-between; gap: var(--space-2); font-size: 0.8125rem; }
.rail-note { font-size: 0.75rem; color: var(--muted-light); line-height: 1.5; }

/* ===== SECTION SHELL ===== */
.shell-section { margin-bottom: var(--space-16); }
.shell-section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-5);
  flex-wrap: wrap;
}
.shell-section-head h2 { font-size: clamp(1.25rem, 2.2vw, 1.625rem); margin-bottom: var(--space-1); }
.shell-section-head p { font-size: 0.9375rem; max-width: 560px; }
.shell-section-head a { font-size: 0.875rem; font-weight: 600; color: var(--accent-2-text); text-decoration: none; white-space: nowrap; }

/* ===== TOOL GRID ===== */
.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(232px, 1fr));
  gap: var(--space-3);
}
.tool-card {
  display: block;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  text-decoration: none;
  color: var(--text);
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}
.tool-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  color: var(--text);
}
.tool-card h3 { font-size: 0.9375rem; margin-bottom: var(--space-2); }
.tool-card p { font-size: 0.8125rem; line-height: 1.55; }
.tool-card .tool-go {
  margin-top: var(--space-3);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent-2-text);
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
}

/* ===== LIBRARY ===== */
.lib-tabs {
  display: inline-flex;
  gap: 2px;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 3px;
  margin-bottom: var(--space-4);
  overflow-x: auto;
  max-width: 100%;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.lib-tabs::-webkit-scrollbar { display: none; }
.lib-tab {
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-sm);
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 0.8125rem;
  font-weight: 600;
  cursor: pointer;
  font-family: inherit;
  white-space: nowrap;
  scroll-snap-align: start;
  transition: all var(--transition-fast);
}
.lib-tab:hover { color: var(--text); }
.lib-tab.active { background: var(--accent); color: var(--accent-fg); }

.lib-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(258px, 1fr));
  gap: var(--space-3);
}
.lib-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  cursor: pointer;
  transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  text-align: left;
  font-family: inherit;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.lib-card:hover { border-color: var(--accent-2); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.lib-card .lib-tag {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent-2-text);
}
.lib-card .lib-text { font-size: 0.875rem; color: var(--text-secondary); line-height: 1.5; }
.lib-card .lib-use { font-size: 0.72rem; color: var(--muted-light); margin-top: auto; }

/* ===== HISTORY / TEMPLATES (rail-adjacent panels) ===== */
.mini-list { display: flex; flex-direction: column; gap: var(--space-2); }
.mini-item {
  font-size: 0.8125rem;
  color: var(--text-secondary);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-input);
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  transition: border-color var(--transition-fast);
  width: 100%;
}
.mini-item:hover { border-color: var(--accent-2); }
.mini-item .h-mode { font-size: 0.62rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--accent-2-text); }
.mini-item .h-text { margin-top: 2px; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }

/* ===== FEATURE LIST (numbered rows) ===== */
.feat-list { display: flex; flex-direction: column; gap: var(--space-3); }
.feat {
  display: flex;
  gap: var(--space-4);
  align-items: flex-start;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
}
.feat-num {
  font-family: 'Libre Baskerville', serif;
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--accent-2-text);
  line-height: 1;
  flex-shrink: 0;
}
.feat h3 { font-size: 0.9375rem; margin-bottom: var(--space-1); }
.feat p { font-size: 0.875rem; line-height: 1.6; }

/* ===== STEPS ===== */
.steps-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: var(--space-4); }
.step-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  transition: border-color var(--transition-fast), transform var(--transition-fast);
}
.step-card:hover { border-color: var(--border-strong); transform: translateY(-2px); }
.step-number {
  font-family: 'Libre Baskerville', serif;
  font-size: 1.75rem; font-weight: 700; color: var(--accent-2-text);
  line-height: 1; margin-bottom: var(--space-3);
}
.step-card h3 { font-size: 0.9375rem; margin-bottom: var(--space-2); }
.step-card p { font-size: 0.875rem; }

/* ===== FAQ ===== */
.faq-list { max-width: 720px; margin: 0 auto; display: flex; flex-direction: column; gap: var(--space-2); }
.faq-list details {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: var(--space-4);
}
.faq-list summary { cursor: pointer; font-weight: 600; font-size: 0.9375rem; list-style: none; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::before { content: "+"; color: var(--accent-2-text); font-weight: 700; margin-right: var(--space-2); }
.faq-list details[open] summary::before { content: "\2212"; }
.faq-list details p { margin: var(--space-3) 0 0; font-size: 0.9375rem; }

/* ===== FOOTER ===== */
.shell-footer {
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
  padding: var(--space-10) 0 var(--space-8);
  margin-top: auto;
}
.shell-footer-grid {
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 0 var(--space-6);
  display: grid;
  grid-template-columns: 1.6fr repeat(3, 1fr);
  gap: var(--space-6);
}
.shell-footer h4 {
  font-size: 0.7rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.08em;
  color: var(--text); margin-bottom: var(--space-3); font-family: 'Inter', sans-serif;
}
.shell-footer a {
  display: block;
  font-size: 0.85rem;
  color: var(--muted);
  text-decoration: none;
  margin-bottom: var(--space-2);
}
.shell-footer a:hover { color: var(--accent-2-text); }
.shell-footer p { font-size: 0.85rem; line-height: 1.6; }
.shell-footer-bottom {
  max-width: var(--shell-max);
  margin: var(--space-8) auto 0;
  padding: var(--space-4) var(--space-6) 0;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
}

/* ===== BUTTON OVERRIDES (dark-safe) ===== */
.btn-primary, .btn-blue { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.btn-primary:hover, .btn-blue:hover { background: var(--accent-dark); color: var(--accent-fg); }
.btn-warn { background: var(--accent-2); border-color: var(--accent-2); color: var(--on-accent-2); }
.btn-warn:hover { background: var(--accent-2-dark); color: #fff; }
.btn-ghost { background: transparent; }
.btn { transition: background var(--transition-fast), border-color var(--transition-fast), color var(--transition-fast), transform var(--transition-fast); }
main a:not(.btn) { text-decoration: none; }

/* ===== SCROLLBAR ===== */
.sb-nav::-webkit-scrollbar { width: 8px; }
.sb-nav::-webkit-scrollbar-thumb { background: var(--border-strong); border-radius: 4px; }
.sb-nav::-webkit-scrollbar-track { background: transparent; }

/* ===== MOBILE ===== */
@media (max-width: 1000px) {
  .gen-layout { grid-template-columns: 1fr; }
  .rail { position: static; }
  .steps-row { grid-template-columns: 1fr; }
  .shell-footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .sidebar { transform: translateX(-100%); box-shadow: var(--shadow-lg); width: var(--sidebar-w); }
  body.sidebar-open .sidebar { transform: translateX(0); }
  body.sidebar-collapsed .sidebar { width: var(--sidebar-w); }
  body.sidebar-collapsed .sidebar .sb-label,
  body.sidebar-collapsed .sidebar .sb-section,
  body.sidebar-collapsed .sidebar .sb-badge { display: inline; }
  body.sidebar-collapsed .sidebar .sb-link { justify-content: flex-start; padding-left: var(--space-3); padding-right: var(--space-3); }
  .app-main, body.sidebar-collapsed .app-main { margin-left: 0; }
  .tb-menu { display: flex; }
  .shell-content { padding: var(--space-5) var(--space-4) var(--space-12); }
  .topbar { padding: 0 var(--space-4); gap: var(--space-2); }
  .tb-link { display: none; }
  .tool-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }
  .lib-grid { grid-template-columns: 1fr; }

  /* 44px minimum touch target (WCAG 2.5.5 / iOS HIG). The icon buttons are
     32px on desktop, which is too small to hit reliably on a phone. */
  .tb-icon-btn,
  .tb-menu,
  .tb-theme,
  .sb-signin-top,
  .sb-collapse { min-width: 44px; min-height: 44px; }
  .sb-logo { min-width: 44px; min-height: 44px; }
  .tb-cta { min-height: 40px; padding-inline: var(--space-4); }

  /* Sidebar links are the primary nav on mobile — give them real height. */
  .sb-link { min-height: 44px; }

  /* Generator controls: 44px touch targets across the board. */
  .mode-tab,
  .gen-toolbar select,
  .generate-btn,
  .gen-submit { min-height: 44px; }
  .toggle { min-height: 44px; }
  .toggle input[type="checkbox"] { width: 22px; height: 22px; }

  /* The label is the real tap target — the checkbox itself is small, but the
     text next to it is what users actually hit. Pad the label out. */
  .toggle { padding-block: var(--space-2); }

  /* Homepage prompt-library category strip */
  .lib-tab { min-height: 44px; display: inline-flex; align-items: center; }

  .tb-cta { min-height: 44px; }

  /* Scrim behind the open mobile sidebar. */
  .sb-scrim {
    position: fixed;
    inset: 0;
    background: rgba(10, 12, 18, 0.45);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
    z-index: var(--z-scrim-side);
  }
  body.sidebar-open .sb-scrim { opacity: 1; pointer-events: auto; }
}
@media (max-width: 560px) {
  .shell-footer-grid { grid-template-columns: 1fr; }
  .gen-toolbar { gap: var(--space-2); }
  .gen-toolbar select { max-width: 100%; }
  .gen-submit { width: 100%; justify-content: center; }
  .tb-search { max-width: none; }
}