/* Reset, ambient background, app shell (spec §10.2, §10.3, §10.6). */
*, *::before, *::after { box-sizing: border-box; }
html { color-scheme: light; }
body {
  margin: 0; min-height: 100vh; background: var(--bg); color: var(--text);
  font: 400 var(--fs-14)/1.5 var(--font); font-variant-numeric: tabular-nums;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3, h4 { margin: 0; font-weight: 600; letter-spacing: -0.02em; line-height: 1.2; }
h1 { font-size: var(--fs-28); }
h2 { font-size: var(--fs-20); }
h3 { font-size: var(--fs-16); }
p { margin: 0; }
a { color: var(--brand-3); text-decoration: none; }
a:hover { text-decoration: underline; }
button, input, select, textarea { font: inherit; color: inherit; }
button { cursor: pointer; }
[x-cloak] { display: none !important; }
code, .mono { font-family: var(--mono); font-size: .92em; }
.sr-only {
  position: absolute; width: 1px; height: 1px; margin: -1px; padding: 0; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}
.muted { color: var(--text-2); }
.num { font-variant-numeric: tabular-nums; }

/* Visible focus (2 px brand-3). */
:focus { outline: none; }
:focus-visible { outline: none; box-shadow: var(--focus); border-radius: var(--r-sm); }

.skip-link {
  position: fixed; left: var(--s-3); top: -60px; z-index: 100; padding: var(--s-2) var(--s-4);
  background: var(--surface-3); border-radius: var(--r-sm); transition: top var(--t-fast) var(--ease);
}
.skip-link:focus { top: var(--s-3); }

/* Ambient background: layered radial gradients + noise, slow drift. */
.ambient { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.ambient::before, .ambient::after { content: ""; position: absolute; inset: -20%; }
.ambient::before {
  background:
    radial-gradient(40% 40% at 15% 10%, rgba(60,203,245,.20), transparent 70%),
    radial-gradient(35% 35% at 90% 95%, rgba(109,91,232,.12), transparent 70%);
  animation: drift 40s var(--ease) infinite alternate;
}
.ambient::after {
  opacity: 0;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='160' height='160'><filter id='n'><feTurbulence type='fractalNoise' baseFrequency='.9' numOctaves='2' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 1  0 0 0 0 1  0 0 0 0 1  0 0 0 .05 0'/></filter><rect width='100%' height='100%' filter='url(%23n)'/></svg>");
}
@keyframes drift { to { transform: translate3d(3%, -2%, 0) scale(1.06); } }

/* Shell */
.rail {
  position: fixed; inset: 0 auto 0 0; z-index: 40; width: var(--rail-w); display: flex; flex-direction: column;
  padding: var(--s-4) var(--s-3); gap: var(--s-1); overflow: hidden;
  background: linear-gradient(180deg, #19146A, #120F4F); border-right: 0; box-shadow: 4px 0 24px -12px rgba(25,20,102,.5);
  transition: width var(--t-med) var(--ease);
}
.rail:hover, .rail:focus-within, .rail.is-pinned { width: var(--rail-w-open); }
.rail-brand { position: relative; display: flex; align-items: center; height: 40px; margin-bottom: var(--s-3); padding: 0 var(--s-2); text-decoration: none; }
.rail-brand:hover { text-decoration: none; }
.rail-mark { display: block; width: 32px; height: auto; }
.rail-wordmark { display: none; width: 168px; height: auto; }
.rail:hover .rail-mark, .rail:focus-within .rail-mark, .rail.is-pinned .rail-mark { display: none; }
.rail:hover .rail-wordmark, .rail:focus-within .rail-wordmark, .rail.is-pinned .rail-wordmark { display: block; }
.topbar-logo { display: none; flex: none; }
.topbar-logo img { display: block; width: 32px; height: auto; }
.rail-link {
  display: flex; align-items: center; gap: var(--s-3); padding: 10px var(--s-3); border-radius: var(--r-sm);
  color: rgba(255,255,255,.74); white-space: nowrap; text-decoration: none; background: none; border: 0; width: 100%; text-align: left;
  transition: background var(--t-fast), color var(--t-fast);
}
.rail-link:hover { background: rgba(255,255,255,.09); color: #fff; text-decoration: none; }
.rail-link[aria-current="page"] { background: rgba(60,203,245,.16); color: #fff; box-shadow: inset 2px 0 0 var(--brand-cyan); }
.rail :focus-visible { box-shadow: 0 0 0 2px #19146A, 0 0 0 4px var(--brand-cyan); }
.rail-link .icon { flex: none; }
.rail-label { opacity: 0; transition: opacity var(--t-med); }
.rail:hover .rail-label, .rail:focus-within .rail-label, .rail.is-pinned .rail-label { opacity: 1; }
.rail-spacer { flex: 1; }
.rail-pin .icon { transition: transform var(--t-med) var(--ease); }
.rail.is-pinned .rail-pin .icon { transform: rotate(180deg); }

.shell { margin-left: var(--rail-w); transition: margin-left var(--t-med) var(--ease); }
.shell.rail-pinned { margin-left: var(--rail-w-open); }
.topbar {
  position: sticky; top: 0; z-index: 30; height: var(--topbar-h); display: flex; align-items: center; gap: var(--s-3);
  padding: 0 var(--s-5); background: rgba(255,255,255,.85); backdrop-filter: blur(14px); border-bottom: 1px solid var(--line);
}
.topbar-search { position: relative; flex: 1; max-width: 460px; }
.topbar-search .icon { position: absolute; left: 12px; top: 50%; transform: translateY(-50%); color: var(--text-2); pointer-events: none; }
.topbar-search .input { padding-left: 38px; padding-right: 64px; }
.kbd {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%); pointer-events: none;
  padding: 1px 6px; border: 1px solid var(--line-strong); border-radius: 6px; font: 500 var(--fs-12)/18px var(--font); color: var(--text-2);
}
.topbar-search-btn { width: 100%; text-align: left; color: var(--text-2); cursor: pointer; }

/* Command palette */
.scrim--top { place-items: start center; padding-top: 12vh; }
.modal--palette { width: min(560px, 100%); padding: var(--s-3); display: flex; flex-direction: column; gap: var(--s-2); }
.pal-list { list-style: none; margin: 0; padding: 0; max-height: 50vh; overflow: auto; }
.pal-group { padding: var(--s-2) var(--s-3) var(--s-1); font-size: var(--fs-12); color: var(--text-2); text-transform: uppercase; letter-spacing: .04em; }
.pal-item { display: flex; align-items: center; gap: var(--s-3); padding: var(--s-2) var(--s-3); border-radius: var(--r-md); cursor: pointer; }
.pal-item.is-active { background: var(--surface-3); box-shadow: inset 0 0 0 1px var(--line-strong); }
.pal-status { min-height: 1.4em; padding: 0 var(--s-3); }
.topbar-spacer { flex: 1; }
.page { max-width: var(--content-max); margin: 0 auto; padding: var(--s-5); display: flex; flex-direction: column; gap: var(--s-5); }
.page > * { min-width: 0; }
.page-head { display: flex; align-items: flex-end; justify-content: space-between; gap: var(--s-4); flex-wrap: wrap; }
.page-head p { color: var(--text-2); margin-top: var(--s-1); }
.route { animation: route-in 180ms var(--ease); }
@keyframes route-in { from { opacity: 0; transform: translateY(4px); } }

/* Slow-network indicator: a thin shimmering bar under the top bar. */
.slow-bar { position: fixed; top: var(--topbar-h); left: var(--rail-w); right: 0; z-index: 29; height: 3px; background: var(--brand-grad); background-size: 200% 100%; animation: slide 1.2s linear infinite; }
@keyframes slide { to { background-position: -200% 0; } }

/* Skeletons */
.skeleton {
  display: block; min-height: 1em; border-radius: var(--r-sm); color: transparent !important;
  background: linear-gradient(90deg, var(--surface-2) 25%, var(--surface-3) 50%, var(--surface-2) 75%); background-size: 200% 100%;
  animation: shimmer 1.4s linear infinite;
}
@keyframes shimmer { to { background-position: -200% 0; } }

/* Toasts */
.toasts { position: fixed; right: var(--s-5); bottom: var(--s-5); z-index: 90; display: flex; flex-direction: column; gap: var(--s-2); width: min(380px, calc(100vw - 32px)); }
.toast {
  display: flex; align-items: flex-start; gap: var(--s-3); padding: var(--s-3) var(--s-4); border-radius: var(--r-md);
  background: var(--surface-3); border: 1px solid var(--line-strong); box-shadow: var(--shadow-1); animation: toast-in var(--t-med) var(--ease);
}
.toast .icon { margin-top: 2px; flex: none; }
.toast--success .icon { color: var(--pass); }
.toast--error .icon { color: var(--fail); }
.toast--info .icon { color: var(--info); }
.toast-body { flex: 1; min-width: 0; }
.toast-actions { display: flex; gap: var(--s-2); margin-top: var(--s-1); }
@keyframes toast-in { from { opacity: 0; transform: translateY(8px) scale(.98); } }

/* Modal */
.scrim { position: fixed; inset: 0; z-index: 60; display: grid; place-items: center; padding: var(--s-4); background: rgba(25,20,70,.45); backdrop-filter: blur(4px); animation: fade var(--t-med); }
.modal {
  width: min(560px, 100%); max-height: calc(100vh - 32px); overflow: auto; padding: var(--s-5);
  background: var(--surface); border: 1px solid var(--line-strong); border-radius: var(--r-lg); box-shadow: var(--shadow-1), var(--glow);
  animation: pop var(--t-med) var(--ease);
}
.modal-head { display: flex; align-items: center; justify-content: space-between; gap: var(--s-3); margin-bottom: var(--s-4); }
@keyframes fade { from { opacity: 0; } }
@keyframes pop { from { opacity: 0; transform: translateY(8px) scale(.98); } }

/* Responsive: rail becomes a bottom tab bar (spec §10.3). */
@media (max-width: 1100px) {
  .page { padding: var(--s-4); }
}
@media (max-width: 768px) {
  .rail, .rail:hover, .rail:focus-within, .rail.is-pinned {
    inset: auto 0 0 0; top: auto; width: 100%; height: 64px; flex-direction: row; justify-content: space-around; align-items: center;
    padding: 0 var(--s-2); border-right: 0; border-top: 0;
  }
  .rail-brand, .rail-spacer, .rail-pin { display: none; }
  .topbar-logo { display: block; }
  .topbar-logo img { width: auto; height: 16px; max-width: 100%; }
  .rail-link { flex-direction: column; justify-content: center; gap: 2px; padding: 6px 4px; width: auto; flex: 1; font-size: var(--fs-12); }
  .rail-label { opacity: 1; }
  .rail-link[aria-current="page"] { box-shadow: inset 0 2px 0 var(--brand-cyan); }
  .shell, .shell.rail-pinned { margin-left: 0; padding-bottom: 72px; }
  .slow-bar { left: 0; }
  .topbar { padding: 0 var(--s-3); gap: var(--s-2); }
  .topbar > * { min-width: 0; }
  .topbar-search { display: none; }
  .reviewer-chip input { width: 84px !important; min-height: 30px; padding: 0 var(--s-2); }
  .topbar .btn--primary { padding: 0 var(--s-2); min-height: 30px; font-size: var(--fs-13); gap: var(--s-1); }
  .topbar-search .kbd, .reviewer-chip .reviewer-label { display: none; }
  .toasts { bottom: 76px; right: var(--s-3); }
  .page-head h1 { font-size: var(--fs-20); }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; scroll-behavior: auto !important; }
  .ambient::before { animation: none; }
}