:root{
  /* Dark-GREY palette (2026-07-19) — lifted off pure black so surfaces read as layered
     greys rather than a flat void. Keep the ~8-value steps between tiers for depth. */
  --bg:#161616; --bg1:#1E1E1E; --bg2:#262626; --bg3:#2E2E2E; --bg4:#373737;
  --rim:rgba(255,255,255,.06); --rim2:rgba(255,255,255,.11); --rim3:rgba(255,255,255,.17);
  --green:#CCFF00; --green-dim:rgba(204,255,0,.1); --green-soft:rgba(204,255,0,.04);
  --gold:#F5A623; --red:#FF5000; --blue:#5AC8FA; --purple:#9B59B6;
  /* FIX F1: bumped --fog from #737373 to #8A8A8A (4.5:1 contrast on #000) */
  --snow:#FFF; --cloud:#D4D4D4; --fog:#8A8A8A; --mist:#4A4A4A;
  --fd:'Playfair Display',serif; --fb:'DM Sans',-apple-system,BlinkMacSystemFont,sans-serif; --fm:'JetBrains Mono',monospace;
  --r:0.75rem; --r-sm:0.5rem; --r-lg:1rem;
}
*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
/* Fluid root font-size: 1rem scales linearly with viewport width.
   Calibrated so 1500px viewport = 16px (matches MacBook 14"); clamps prevent
   absurd sizes on tiny phones / 5K displays. All other CSS uses rem, so the
   whole UI scales proportionally with screen size. */
/* Global UI scale: the whole app is rem-based, so the root font-size IS the master zoom. Dialled to 75%
   of the previous fluid size (each term ×0.75) so the default isn't cramped — leaves room for the canvas
   table-of-contents (left) + portable copilot (right). Users can still browser-zoom up if they want. */
html{scroll-behavior:smooth;font-size:clamp(9px,0.8vw,21px)}
body{background:var(--bg);color:var(--cloud);font-family:var(--fb);-webkit-font-smoothing:antialiased;font-size:0.9375rem;line-height:1.55;min-height:100vh}
::selection{background:rgba(204,255,0,.2)}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,textarea{font-family:inherit;border:none;outline:none}
a{color:inherit;text-decoration:none}

/* FIX F2: global focus-visible states */
:focus{outline:none}
:focus-visible{outline:0.125rem solid var(--green);outline-offset:0.125rem;border-radius:0.25rem}
button:focus-visible,[role="button"]:focus-visible,[tabindex]:focus-visible{outline:0.125rem solid var(--green);outline-offset:0.125rem}

::-webkit-scrollbar{width:0.3125rem;height:0.3125rem}
::-webkit-scrollbar-track{background:transparent}
::-webkit-scrollbar-thumb{background:var(--rim2);border-radius:6.25rem}
::-webkit-scrollbar-thumb:hover{background:var(--mist)}

.bg-wrap{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.bg-wrap::after{content:'';position:absolute;inset:0;background:radial-gradient(ellipse 50% 40% at 50% 0%,rgba(204,255,0,.02) 0%,transparent 55%)}

.shell{position:relative;z-index:1;display:flex;flex-direction:column;min-height:100vh}

/* ═══════════ TOP NAV ═══════════ */
.nav{position:sticky;top:0;z-index:100;display:flex;align-items:center;justify-content:space-between;padding:0.875rem 1.75rem;border-bottom:0.0625rem solid var(--rim);background:rgba(0,0,0,.9);backdrop-filter:blur(1.25rem);flex-shrink:0;gap:1rem}
.nav-left{display:flex;align-items:center;gap:1.25rem;min-width:0}
.logo{display:flex;align-items:center;gap:0.625rem;flex-shrink:0}
.logo-mark{width:1.875rem;height:1.875rem;border-radius:0.5rem;background:var(--green);display:grid;place-items:center;flex-shrink:0}
.logo-mark svg{width:1rem;height:1rem}
.logo-name{font-size:0.875rem;font-weight:700;color:var(--snow);letter-spacing:-.01em}
.logo-name span{color:var(--green)}

.nav-tabs{display:flex;gap:0.125rem}
.nav-tab{padding:0.5rem 0.875rem;border-radius:0.5rem;font-size:0.8125rem;font-weight:500;color:var(--fog);transition:all .15s;display:flex;align-items:center;gap:0.4375rem;white-space:nowrap;position:relative}
.nav-tab:hover{color:var(--cloud);background:var(--bg2)}
.nav-tab.active{color:var(--snow);background:var(--bg3)}
.nav-tab svg{width:0.8125rem;height:0.8125rem;opacity:.85}

/* NEW: "new since last visit" nav badge — retention mechanic */
.nav-badge{position:absolute;top:0.3125rem;right:0.5rem;min-width:0.875rem;height:0.875rem;padding:0 0.25rem;border-radius:6.25rem;background:var(--green);color:#000;font-family:var(--fm);font-size:0.53125rem;font-weight:700;display:grid;place-items:center;box-shadow:0 0 0.375rem rgba(204,255,0,.5)}

/* Plus badge for gated tabs */
.nav-tab .plus-mark{display:inline-flex;align-items:center;justify-content:center;width:1rem;height:1rem;border-radius:0.25rem;background:rgba(245,166,35,.12);color:var(--gold);font-family:var(--fm);font-size:0.5rem;font-weight:700;margin-left:0.25rem}

.nav-right{display:flex;align-items:center;gap:0.625rem;flex-shrink:0}
.search-wrap{position:relative}
.search-wrap svg{position:absolute;left:0.6875rem;top:50%;transform:translateY(-50%);width:0.75rem;height:0.75rem;color:var(--fog)}
.search-input{padding:0.4375rem 0.75rem 0.4375rem 2rem;background:var(--bg2);border:0.0625rem solid var(--rim);border-radius:0.5rem;font-size:0.78125rem;color:var(--cloud);width:12.5rem;transition:border-color .15s}
.search-input:focus{border-color:rgba(204,255,0,.3)}
.search-input::placeholder{color:var(--fog)}

/* FIX U8: identity element — compact greeting chip */
.identity-chip{display:flex;align-items:center;gap:0.5rem;padding:0.3125rem 0.625rem 0.3125rem 0.3125rem;background:var(--bg2);border:0.0625rem solid var(--rim);border-radius:6.25rem;cursor:pointer;transition:all .15s}
.identity-chip:hover{border-color:var(--rim2)}
.identity-av{width:1.5rem;height:1.5rem;border-radius:50%;background:linear-gradient(135deg,var(--green),var(--gold));display:grid;place-items:center;font-weight:700;font-size:0.625rem;color:#000}
.identity-name{font-size:0.75rem;font-weight:500;color:var(--cloud)}
.identity-streak{font-family:var(--fm);font-size:0.625rem;color:var(--gold);display:flex;align-items:center;gap:0.1875rem}
.identity-streak svg{width:0.625rem;height:0.625rem}

/* ═══════════ PAGE SWITCHER ═══════════ */
.page{display:none;flex:1;min-height:0;animation:fadeIn .25s ease both}
.page.active{display:flex;flex-direction:column}
@keyframes fadeIn{from{opacity:0;transform:translateY(0.1875rem)}to{opacity:1;transform:none}}

/* Context bridge — shows when workspace entered from Briefing */
.context-bridge{display:none;align-items:center;gap:0.625rem;padding:0.625rem 1.75rem;background:linear-gradient(90deg,rgba(204,255,0,.08),transparent 70%);border-bottom:0.0625rem solid var(--rim);font-family:var(--fm);font-size:0.6875rem;color:var(--cloud);flex-shrink:0;animation:slideDown .3s ease both}
.context-bridge.show{display:flex}
@keyframes slideDown{from{opacity:0;transform:translateY(-0.25rem)}to{opacity:1;transform:none}}
.context-bridge-back{display:flex;align-items:center;gap:0.3125rem;color:var(--green);padding:0.25rem 0.625rem;border-radius:0.375rem;background:var(--green-soft);border:0.0625rem solid rgba(204,255,0,.2);font-weight:600}
.context-bridge-back:hover{background:var(--green-dim)}
.context-bridge-back svg{width:0.625rem;height:0.625rem}
.context-bridge-text{color:var(--fog)}
.context-bridge-text b{color:var(--cloud)}
.context-bridge-dismiss{margin-left:auto;color:var(--fog);padding:0.3125rem;border-radius:0.25rem}
.context-bridge-dismiss:hover{color:var(--cloud);background:var(--bg2)}
.context-bridge-dismiss svg{width:0.75rem;height:0.75rem}

/* ═══════════ Tooltip system (for research tier) ═══════════ */
[data-tooltip]{position:relative}
[data-tooltip]::after{content:attr(data-tooltip);position:absolute;bottom:calc(100% + 0.5rem);left:50%;transform:translateX(-50%);padding:0.5rem 0.75rem;background:var(--bg3);border:0.0625rem solid var(--rim2);border-radius:0.375rem;font-family:var(--fb);font-size:0.6875rem;color:var(--cloud);line-height:1.4;white-space:nowrap;opacity:0;pointer-events:none;transition:opacity .15s;z-index:200;font-weight:400;letter-spacing:0;text-transform:none;max-width:16.25rem;white-space:normal;width:max-content}
[data-tooltip]:hover::after{opacity:1}
[data-tooltip-wide]::after{max-width:18.75rem;width:18.75rem}