/* Reset, shell grid, scroll regions — SITE-PLAN.md §8.1, §10.3, §10.9 */

*, *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--canvas);
  color: var(--ink);
  font: 400 var(--t-md)/1.5 var(--sans);
  -webkit-font-smoothing: antialiased;
  min-width: 900px;
}
a { color: var(--accent-lit); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, select { font: inherit; color: inherit; }
button { cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
img { max-width: 100%; }
::selection { background: var(--accent-wash); color: var(--ink); }

:focus-visible {
  outline: 2px solid var(--accent-lit);
  outline-offset: 2px;
}

.mono { font-family: var(--mono); }
.sr-only {
  position: absolute; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap;
}

/* ── App shell ─────────────────────────────────────────── */

#app-shell {
  display: grid;
  grid-template-rows: var(--bar-h) 1fr var(--strip-h);
  grid-template-columns: var(--rail-w) 1fr;
  grid-template-areas:
    "bar    bar"
    "rail   main"
    "strip  strip";
  height: 100vh;
}

.command-bar {
  grid-area: bar;
  display: flex;
  align-items: center;
  gap: var(--s4);
  padding: 0 var(--s4);
  background: var(--surface);
  border-bottom: 1px solid var(--line);
}

.rail {
  grid-area: rail;
  background: var(--surface);
  border-right: 1px solid var(--line);
  overflow-y: auto;
  padding: var(--s3) 0;
}

.main-region {
  grid-area: main;
  overflow-y: auto;
  position: relative;
  background: var(--canvas);
}

.main-region-inner {
  padding: var(--s5) var(--s6);
  max-width: 1280px;
}

.status-strip {
  grid-area: strip;
  display: flex;
  align-items: center;
  gap: var(--s4);
  padding: 0 var(--s4);
  background: var(--surface);
  border-top: 1px solid var(--line);
  font: 500 var(--t-xs)/1 var(--mono);
  color: var(--ink-faint);
  letter-spacing: 0.04em;
}

@media (max-width: 900px) {
  #app-shell { grid-template-columns: 56px 1fr; }
  .rail .nav-label { display: none; }
}

/* ── Overlay layers ────────────────────────────────────── */

.overlay-backdrop {
  position: fixed; inset: 0;
  background: #000000B3;
  z-index: 40;
}

.drawer {
  position: fixed; top: 0; right: 0; bottom: 0;
  width: var(--drawer-w);
  max-width: 92vw;
  background: var(--surface);
  border-left: 1px solid var(--line-strong);
  box-shadow: -8px 0 32px #00000066;
  z-index: 50;
  overflow-y: auto;
  transform: translateX(0);
  transition: transform var(--motion);
}
.drawer[data-entering="true"] { transform: translateX(100%); }

.modal-wrap {
  position: fixed; inset: 0;
  z-index: 60;
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
}
.modal {
  width: 100%;
  max-width: 640px;
  max-height: 72vh;
  overflow-y: auto;
  background: var(--surface-2);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius);
  box-shadow: 0 16px 48px #000000A0;
}

@media (max-width: 900px) {
  .drawer { width: 100vw; }
}