/* ──────────────────────────────────────────────────────────────────────────
   COWORK · v3 · shell.css
   Page chrome: terrain, grain, topbar, breadcrumbs, rails, tabs, foot, layout
   ────────────────────────────────────────────────────────────────────────── */

/* ── Terrain — Three.js contour render lives at canvas#topo ──────────────
   The design hand-off included a static CSS stand-in (.cw-terrain) for
   the terrain. We keep the live WebGL implementation from cowork-topo.js
   instead; the canvas is positioned at the same terrain z-index so the
   rest of the chrome composes over it exactly as the design intended. */
canvas#topo {
  position: fixed; inset: 0; width: 100vw; height: 100vh;
  z-index: var(--z-terrain); pointer-events: none;
}
/* Back-compat: any v4 markup that still renders <div class="cw-terrain">
   or the legacy .atmosphere overlay collapses to nothing so the Three.js
   canvas reads through cleanly. */
.cw-terrain, .atmosphere { display: none !important; }

/* ── Film grain — denser noise + softer blend for a paper/film feel ──── */
.cw-grain {
  position: fixed; inset: 0; z-index: var(--z-grain); pointer-events: none;
  opacity: .55; mix-blend-mode: soft-light;
  /* 360×360 tile, fractalNoise b=2.8, 4 octaves, stitched + slight contrast */
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='360' height='360'><filter id='n' x='0' y='0'><feTurbulence type='fractalNoise' baseFrequency='2.8' numOctaves='4' seed='9' stitchTiles='stitch'/><feComponentTransfer><feFuncA type='linear' slope='1.7' intercept='-.30'/></feComponentTransfer><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 1 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n)'/></svg>");
  background-size: 360px 360px;
}
.cw-grain::after {
  /* second pass at higher frequency for fine-grain bite */
  content: ""; position: absolute; inset: 0;
  opacity: .35; mix-blend-mode: overlay;
  background-image: url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='220' height='220'><filter id='n2'><feTurbulence type='fractalNoise' baseFrequency='4.2' numOctaves='2' seed='3' stitchTiles='stitch'/><feColorMatrix values='0 0 0 0 0  0 0 0 0 0  0 0 0 0 0  0 0 0 .8 0'/></filter><rect width='100%25' height='100%25' filter='url(%23n2)'/></svg>");
  background-size: 220px 220px;
}

/* ── Page container ────────────────────────────────────────────────────── */
.page { position: relative; z-index: var(--z-page); }

/* ──────────────────────────────────────────────────────────────────────────
   TOP-BAR — cross-page nav
   ────────────────────────────────────────────────────────────────────────── */
.cw-topbar {
  position: sticky; top: 0; z-index: var(--z-topbar);
  display: grid; grid-template-columns: auto 1fr auto;
  align-items: center; gap: var(--s-5);
  padding: 12px var(--s-6);
  background: rgba(247,243,235,.78);
  -webkit-backdrop-filter: blur(14px) saturate(115%);
  backdrop-filter: blur(14px) saturate(115%);
  border-bottom: 1px solid var(--hair);
}

.cw-brand { display: inline-flex; align-items: center; gap: var(--s-3); }
.cw-brand__mark {
  width: 28px; height: 28px; border-radius: 28px;
  display: grid; place-items: center;
  background: var(--ink-1); color: var(--bg-1);
  font: 500 italic 16px/1 var(--serif);
}
.cw-brand__wordmark { font: var(--t-mono-sm); letter-spacing: var(--tracking); text-transform: uppercase; color: var(--ink-2); }

.cw-nav { display: flex; justify-content: center; gap: 2px; flex-wrap: wrap; }
.cw-nav__link {
  position: relative;
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: 8px 14px; border-radius: var(--r-pill);
  font: var(--t-mono-sm); letter-spacing: var(--tracking); text-transform: uppercase;
  color: var(--ink-3);
  transition: color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
.cw-nav__link:hover { color: var(--ink-1); }
.cw-nav__link.is-active { color: var(--ink-1); background: rgba(20,22,18,.06); }
.cw-nav__link.is-active::after {
  content: ""; position: absolute; left: 50%; bottom: -14px; transform: translateX(-50%);
  width: 4px; height: 4px; border-radius: 4px; background: var(--accent-warm);
}
.cw-nav__link.admin-only::before {
  content: "◆"; font-size: 7px; color: var(--accent-warm);
}
.cw-nav__link .badge {
  display: inline-grid; place-items: center;
  min-width: 18px; height: 16px; padding: 0 5px;
  border-radius: 10px; background: rgba(20,22,18,.10); color: var(--ink-2);
  font: 500 9px/1 var(--mono); letter-spacing: .04em;
}

.cw-tools { display: flex; align-items: center; gap: var(--s-2); }

.cw-live-dot {
  width: 8px; height: 8px; border-radius: 8px; background: var(--ok);
  box-shadow: 0 0 0 3px rgba(91,139,107,.18);
  animation: cw-pulse-dot 2.2s var(--ease) infinite;
}
@keyframes cw-pulse-dot { 0%,100% { transform: scale(1); opacity: 1; } 50% { transform: scale(1.15); opacity: .8; } }

.icon-btn {
  position: relative;
  display: inline-grid; place-items: center;
  width: 32px; height: 32px; border-radius: 32px;
  border: 1px solid var(--hair-2); background: var(--bg-2); color: var(--ink-2);
  font: var(--t-mono);
}
.icon-btn:hover { border-color: var(--ink-2); color: var(--ink-1); }
.icon-btn .badge {
  position: absolute; top: -3px; right: -3px; min-width: 16px; height: 14px;
  padding: 0 4px; border-radius: 10px;
  background: var(--accent-warm); color: #fff;
  font: 500 9px/1 var(--mono); display: grid; place-items: center;
}

.cw-timer-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 12px; border-radius: var(--r-pill);
  border: 1px solid var(--hair-2); background: var(--bg-2);
  font: var(--t-mono-sm); letter-spacing: var(--tracking-tight); color: var(--ink-2);
}
.cw-timer-btn .dot { width: 8px; height: 8px; border-radius: 8px; background: var(--accent-warm); animation: cw-pulse-dot 1.4s infinite; }

.user-chip {
  display: inline-flex; align-items: center; gap: var(--s-2);
  padding: 4px 12px 4px 4px; border-radius: var(--r-pill);
  border: 1px solid var(--hair-2); background: var(--bg-2); color: var(--ink-1);
  font: var(--t-mono-sm); letter-spacing: var(--tracking-tight);
}
.user-chip:hover { border-color: var(--ink-2); }
.user-chip__name { font-weight: 500; }
.user-chip__role { color: var(--ink-3); }
.user-chip .av { width: 22px; height: 22px; font-size: 9px; }

.cw-kbd {
  display: inline-grid; place-items: center; min-width: 18px; padding: 0 5px; height: 16px;
  border: 1px solid var(--hair-2); border-radius: 4px;
  background: var(--bg-3); color: var(--ink-3);
  font: 500 9px/1 var(--mono);
}

/* ──────────────────────────────────────────────────────────────────────────
   BREADCRUMBS
   ────────────────────────────────────────────────────────────────────────── */
.cw-breadcrumbs {
  position: relative; z-index: var(--z-page);
  display: flex; align-items: center; gap: var(--s-2);
  padding: var(--s-3) var(--s-6);
  font: var(--t-mono-sm); letter-spacing: var(--tracking); text-transform: uppercase; color: var(--ink-3);
  border-bottom: 1px solid var(--hair-soft);
  background: rgba(247,243,235,.40);
  -webkit-backdrop-filter: blur(10px); backdrop-filter: blur(10px);
}
.cw-breadcrumbs a { color: var(--ink-3); }
.cw-breadcrumbs a:hover { color: var(--ink-1); }
.cw-breadcrumbs .sep { color: var(--ink-4); }
.cw-breadcrumbs .here { color: var(--ink-1); }
.cw-breadcrumbs .spacer { flex: 1; }

/* ──────────────────────────────────────────────────────────────────────────
   MAIN — page-content wrapper
   ────────────────────────────────────────────────────────────────────────── */
.cw-main {
  position: relative; z-index: var(--z-page);
  max-width: 1280px; margin: 0 auto;
  padding: var(--s-7) var(--s-6) var(--s-9);
}
.cw-main--wide   { max-width: 1440px; }
.cw-main--narrow { max-width: 980px;  }

/* page + rail layout */
.cw-layout {
  display: grid; grid-template-columns: 220px 1fr;
  gap: var(--s-7);
  align-items: start;
}
@media (max-width: 980px) { .cw-layout { grid-template-columns: 1fr; } }

/* ──────────────────────────────────────────────────────────────────────────
   CW-RAIL — in-page section navigation
   ────────────────────────────────────────────────────────────────────────── */
.cw-rail {
  position: sticky; top: 80px;
  display: grid; gap: 2px;
  z-index: var(--z-rail);
}
.cw-rail__label {
  font: var(--t-mono-sm); letter-spacing: var(--tracking); text-transform: uppercase;
  color: var(--ink-4); padding: 0 var(--s-3) var(--s-2);
}
.cw-rail a {
  display: flex; justify-content: space-between; align-items: center;
  padding: 8px var(--s-3);
  border-left: 2px solid transparent;
  font: var(--t-body-sm); color: var(--ink-3);
  transition: color var(--dur-1) var(--ease), border-color var(--dur-1) var(--ease), background var(--dur-1) var(--ease);
}
.cw-rail a .ix { font: var(--t-mono-sm); letter-spacing: var(--tracking-tight); color: var(--ink-4); margin-right: 4px; }
.cw-rail a:hover { color: var(--ink-1); }
.cw-rail a.is-active {
  color: var(--ink-1);
  border-left-color: var(--accent);
  background: rgba(31,53,48,.04);
}
@media (max-width: 980px) {
  .cw-rail { position: static; grid-auto-flow: column; grid-auto-columns: max-content; overflow-x: auto; padding-bottom: var(--s-3); }
  .cw-rail a { border-left: 0; border-bottom: 2px solid transparent; white-space: nowrap; }
  .cw-rail a.is-active { border-bottom-color: var(--accent); background: transparent; }
  .cw-rail__label { display: none; }
}

/* ──────────────────────────────────────────────────────────────────────────
   CW-TABS — in-page tabbed sections
   ────────────────────────────────────────────────────────────────────────── */
.cw-tabs {
  display: inline-flex; gap: 2px;
  padding: var(--s-2);
  background: var(--glass-fill); border: 1px solid var(--glass-stroke);
  border-radius: var(--r-pill);
  margin-bottom: var(--s-5);
}
.cw-tabs a {
  padding: 8px 16px; border-radius: var(--r-pill);
  font: var(--t-mono-sm); letter-spacing: var(--tracking); text-transform: uppercase;
  color: var(--ink-3);
}
.cw-tabs a:hover { color: var(--ink-1); }
.cw-tabs a.is-active { background: var(--ink-1); color: var(--bg-1); }

/* ──────────────────────────────────────────────────────────────────────────
   CW-DISCRAIL — AGORA's scroll-spy discs
   ────────────────────────────────────────────────────────────────────────── */
.cw-discrail {
  position: fixed; left: 18px; top: 50%; transform: translateY(-50%);
  display: grid; gap: 10px; z-index: var(--z-rail);
}
.cw-discrail__cap {
  font: var(--t-mono-sm); letter-spacing: var(--tracking); text-transform: uppercase;
  color: var(--ink-4); writing-mode: vertical-rl; transform: rotate(180deg);
  padding: var(--s-2) 0;
}
.cw-discrail__disc {
  width: 10px; height: 10px; border-radius: 10px;
  border: 1px solid var(--hair-2); background: transparent;
}
.cw-discrail__disc:hover { border-color: var(--ink-1); }
.cw-discrail__disc.is-active { background: var(--ink-1); border-color: var(--ink-1); }
.cw-discrail__disc.is-admin  { border-color: var(--accent-warm); }
.cw-discrail__disc.is-admin.is-active { background: var(--accent-warm); }
@media (max-width: 1240px) { .cw-discrail { display: none; } }

/* ──────────────────────────────────────────────────────────────────────────
   FOOT
   ────────────────────────────────────────────────────────────────────────── */
.cw-foot {
  position: relative; z-index: var(--z-page);
  display: flex; justify-content: space-between;
  padding: var(--s-4) var(--s-6);
  border-top: 1px solid var(--hair);
  font: var(--t-mono-sm); letter-spacing: var(--tracking); text-transform: uppercase; color: var(--ink-4);
}

/* ──────────────────────────────────────────────────────────────────────────
   Public landing footer reuses .cw-foot — no changes needed
   ────────────────────────────────────────────────────────────────────────── */