/* Sloan Brain. Tokens shared with fabio.cool so the two feel like one site. */
:root{
  --bg:#FAFAF7; --bg-2:#F2F1EC;
  --surface:#FFFFFF; --surface-2:#F6F5F1;
  --ink:#131215; --ink-2:#47454C; --ink-3:#6C6971;
  --line:rgba(19,18,21,.11); --line-2:rgba(19,18,21,.065);
  --accent:#E4471A; --accent-ink:#B4380F; --accent-soft:rgba(228,71,26,.085);
  --btn:#131215; --btn-fg:#FFFFFF;
  --ok:#157A45; --ok-soft:rgba(21,122,69,.10);
  --warn:#9A6400; --warn-soft:rgba(186,124,10,.12);
  --info:#2B5BC9; --info-soft:rgba(43,91,201,.09);
  --mark:rgba(228,71,26,.16);
  --dot:rgba(19,18,21,.09);
  --shadow-sm:0 1px 2px rgba(19,18,21,.05), 0 1px 1px rgba(19,18,21,.03);
  --shadow-md:0 6px 18px rgba(19,18,21,.06), 0 1px 3px rgba(19,18,21,.05);
  --shadow-lg:0 24px 60px rgba(19,18,21,.11), 0 6px 16px rgba(19,18,21,.05);
  --sans:"Geist",ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:"Geist Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --serif:"Instrument Serif",ui-serif,Georgia,"Times New Roman",serif;
  --maxw:820px;
  --r-sm:10px; --r-md:14px; --r-lg:20px;
  --ease:cubic-bezier(.2,.75,.2,1);
}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]){
    --bg:#0B0B0C; --bg-2:#111113;
    --surface:#151517; --surface-2:#1B1B1E;
    --ink:#F5F4F1; --ink-2:#C6C3C9; --ink-3:#928F97;
    --line:rgba(255,255,255,.11); --line-2:rgba(255,255,255,.065);
    --accent:#FF6B3D; --accent-ink:#FF8B64; --accent-soft:rgba(255,107,61,.12);
    --btn:#F5F4F1; --btn-fg:#0B0B0C;
    --ok:#46D18C; --ok-soft:rgba(70,209,140,.12);
    --warn:#F2B84B; --warn-soft:rgba(242,184,75,.13);
    --info:#86A8FF; --info-soft:rgba(134,168,255,.12);
    --mark:rgba(255,107,61,.24);
    --dot:rgba(255,255,255,.075);
    --shadow-sm:0 1px 2px rgba(0,0,0,.45);
    --shadow-md:0 6px 18px rgba(0,0,0,.45);
    --shadow-lg:0 24px 60px rgba(0,0,0,.55), 0 6px 16px rgba(0,0,0,.4);
  }
}
:root[data-theme="dark"]{
  --bg:#0B0B0C; --bg-2:#111113;
  --surface:#151517; --surface-2:#1B1B1E;
  --ink:#F5F4F1; --ink-2:#C6C3C9; --ink-3:#928F97;
  --line:rgba(255,255,255,.11); --line-2:rgba(255,255,255,.065);
  --accent:#FF6B3D; --accent-ink:#FF8B64; --accent-soft:rgba(255,107,61,.12);
  --btn:#F5F4F1; --btn-fg:#0B0B0C;
  --ok:#46D18C; --ok-soft:rgba(70,209,140,.12);
  --warn:#F2B84B; --warn-soft:rgba(242,184,75,.13);
  --info:#86A8FF; --info-soft:rgba(134,168,255,.12);
  --mark:rgba(255,107,61,.24);
  --dot:rgba(255,255,255,.075);
  --shadow-sm:0 1px 2px rgba(0,0,0,.45);
  --shadow-md:0 6px 18px rgba(0,0,0,.45);
  --shadow-lg:0 24px 60px rgba(0,0,0,.55), 0 6px 16px rgba(0,0,0,.4);
}

/* ------------------------------------------------------------ base */
*,*::before,*::after{box-sizing:border-box}
[hidden]{display:none!important}
html{-webkit-text-size-adjust:100%}
body{
  margin:0; min-height:100vh; min-height:100dvh; display:flex; flex-direction:column;
  background:var(--bg); color:var(--ink-2);
  font-family:var(--sans); font-size:16px; line-height:1.6;
  -webkit-font-smoothing:antialiased; -moz-osx-font-smoothing:grayscale; overflow-x:hidden;
}
main{flex:1; display:flex; flex-direction:column}
a{color:var(--accent-ink); text-decoration-thickness:1px; text-underline-offset:3px}
a:hover{color:var(--accent)}
h1,h2,h3{color:var(--ink); margin:0; line-height:1.1; letter-spacing:-.028em; font-weight:620}
p{margin:0}
button{font:inherit; color:inherit}
:focus-visible{outline:2px solid var(--accent); outline-offset:2px; border-radius:6px}
::selection{background:var(--accent); color:#fff}
.sr{position:absolute!important; width:1px; height:1px; padding:0; margin:-1px; overflow:hidden; clip:rect(0,0,0,0); white-space:nowrap; border:0}
.wrap{width:100%; max-width:var(--maxw); margin-inline:auto; padding-inline:clamp(16px,4vw,32px)}
.skip{position:absolute; left:-9999px; top:0; z-index:100; background:var(--btn); color:var(--btn-fg); padding:10px 16px; border-radius:0 0 var(--r-sm) 0; font-weight:600; font-size:14px}
.skip:focus{left:0}
em.s{font-family:var(--serif); font-style:italic; font-weight:400; letter-spacing:-.01em; color:var(--accent-ink)}
kbd{font:500 11px/1 var(--mono); padding:2px 5px; border:1px solid var(--line); border-bottom-width:2px; border-radius:5px; color:var(--ink-3); background:var(--surface)}

/* ------------------------------------------------------------ buttons, chips */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px; min-height:40px; white-space:nowrap;
  padding:0 16px; border-radius:11px; font:560 14.5px/1 var(--sans); letter-spacing:-.005em;
  text-decoration:none; border:1px solid transparent; cursor:pointer;
  transition:transform .18s var(--ease), background .18s, border-color .18s, color .18s;
}
.btn svg{width:16px; height:16px; flex:none}
.btn--primary{background:var(--btn); color:var(--btn-fg); box-shadow:var(--shadow-sm)}
.btn--primary:hover{transform:translateY(-1px)}
.btn--ghost{background:var(--surface); color:var(--ink); border-color:var(--line)}
.btn--ghost:hover{border-color:color-mix(in srgb, var(--ink) 30%, transparent)}
.btn--sm{min-height:34px; padding:0 12px; font-size:13.5px; border-radius:9px}
.icon-btn{
  width:36px; height:36px; display:grid; place-items:center; border-radius:10px; flex:none;
  background:transparent; border:1px solid var(--line); color:var(--ink-2); cursor:pointer; transition:color .15s, border-color .15s;
}
.icon-btn:hover{color:var(--ink); border-color:color-mix(in srgb, var(--ink) 28%, transparent)}
.icon-btn svg{width:17px; height:17px}
.i-sun{display:none}
:root[data-theme="dark"] .i-sun{display:block} :root[data-theme="dark"] .i-moon{display:none}
@media (prefers-color-scheme:dark){
  :root:not([data-theme="light"]) .i-sun{display:block}
  :root:not([data-theme="light"]) .i-moon{display:none}
}
.chip{
  display:inline-flex; align-items:center; gap:6px; white-space:nowrap;
  font:500 11.5px/1 var(--mono); letter-spacing:.01em; padding:5px 8px; border-radius:7px;
  background:var(--surface-2); color:var(--ink-2); border:1px solid var(--line-2);
}
.chip--accent{background:var(--accent-soft); color:var(--accent-ink); border-color:transparent}
.chip--deep{background:var(--btn); color:var(--btn-fg); border-color:transparent}
.pill{
  display:inline-flex; align-items:center; text-align:left; min-height:38px; padding:8px 14px; border-radius:99px;
  background:var(--surface); border:1px solid var(--line); color:var(--ink-2); font-size:14px; line-height:1.35; cursor:pointer;
  transition:border-color .15s, color .15s, transform .18s var(--ease);
}
.pill:hover{color:var(--ink); border-color:color-mix(in srgb, var(--ink) 28%, transparent); transform:translateY(-1px)}

/* ------------------------------------------------------------ nav */
.nav{
  position:sticky; top:0; z-index:40;
  background:color-mix(in srgb, var(--bg) 82%, transparent);
  -webkit-backdrop-filter:saturate(180%) blur(14px); backdrop-filter:saturate(180%) blur(14px);
  border-bottom:1px solid var(--line-2);
}
.nav-in{display:flex; align-items:center; gap:12px; height:60px}
.brand{display:flex; align-items:center; gap:10px; margin-right:auto; text-decoration:none; color:var(--ink); min-width:0}
.brand:hover{color:var(--ink)}
.brand-mark{
  width:30px; height:30px; border-radius:9px; display:grid; place-items:center; position:relative; flex:none;
  background:var(--btn); color:var(--btn-fg); font:italic 400 21px/1 var(--serif); padding-bottom:3px;
}
.brand-mark::after{content:""; position:absolute; top:-2px; right:-2px; width:9px; height:9px; border-radius:50%; background:var(--accent); box-shadow:0 0 0 2px var(--bg)}
.brand-name{font-weight:620; letter-spacing:-.02em; font-size:15.5px; white-space:nowrap}
.brand-ver{white-space:nowrap; font:500 11px/1 var(--mono); color:var(--ink-3); padding:4px 6px; border:1px solid var(--line); border-radius:6px}
.nav-stat{font:500 12px/1 var(--mono); color:var(--ink-3); white-space:nowrap}
@media (max-width:640px){.nav-stat{display:none}}
@media (max-width:400px){.brand-ver{display:none}}

/* ------------------------------------------------------------ public demo */
.demo-bar{background:var(--btn); color:var(--btn-fg)}
.demo-bar-in{display:flex; align-items:center; gap:12px; min-height:44px; padding-block:8px; font-size:13.5px; line-height:1.4}
.demo-bar p{margin:0; color:color-mix(in srgb, var(--btn-fg) 78%, transparent); min-width:0}
.demo-bar a{color:var(--btn-fg)}
.demo-tag{flex:none; font:600 11px/1 var(--mono); letter-spacing:.08em; text-transform:uppercase; padding:5px 7px; border-radius:6px; background:var(--accent); color:#fff}
.demo-link{flex:none; margin-left:auto; font-weight:600; text-decoration:none; white-space:nowrap}
.demo-link:hover{text-decoration:underline}
@media (max-width:640px){
  .demo-bar-in{flex-wrap:wrap; gap:6px 10px}
  .demo-link{margin-left:0}
}
.foot{padding-block:8px 48px; font-size:12.5px; color:var(--ink-3); line-height:1.55}
.foot a{color:var(--ink-3)}
body.has-thread .foot{display:none}
.credit{margin-top:14px; padding:12px 14px; border-radius:var(--r-sm); background:var(--surface-2); border:1px solid var(--line-2); font-size:13px; line-height:1.5; color:var(--ink-3)}
.credit strong{color:var(--ink-2); font-weight:600}
.credit a{color:var(--ink-3)}

/* ------------------------------------------------------------ hero */
.hero{position:relative; padding-block:clamp(40px,8vw,88px) 28px}
.hero::before{
  content:""; position:absolute; inset:0; z-index:-1;
  background-image:radial-gradient(var(--dot) 1px, transparent 1.2px); background-size:22px 22px;
  -webkit-mask-image:radial-gradient(ellipse 70% 80% at 50% 20%, #000 25%, transparent 72%);
          mask-image:radial-gradient(ellipse 70% 80% at 50% 20%, #000 25%, transparent 72%);
}
.kicker{
  display:inline-flex; align-items:center; gap:9px; margin-bottom:22px; padding:7px 13px 7px 11px; border-radius:99px;
  background:var(--accent-soft); border:1px solid color-mix(in srgb, var(--accent) 22%, transparent);
  font:500 12px/1 var(--mono); letter-spacing:.08em; text-transform:uppercase; color:var(--ink-2);
}
.kicker .dot{width:7px; height:7px; border-radius:50%; background:var(--accent)}
.h1{font-size:clamp(36px,6.4vw,60px); letter-spacing:-.04em; font-weight:600; max-width:15ch; line-height:1.02}
.h1 em.s{font-size:1.08em; letter-spacing:-.02em}
.lede{margin-top:18px; max-width:58ch; font-size:clamp(16px,1.6vw,18px); color:var(--ink-2)}
.h3{font-size:18px; letter-spacing:-.02em}

/* ------------------------------------------------------------ composer */
.dock{padding-block:4px 10px}
.composer{
  background:var(--surface); border:1px solid var(--line); border-radius:var(--r-lg);
  box-shadow:var(--shadow-md); padding:14px 14px 12px 18px;
  transition:border-color .18s, box-shadow .18s;
}
.composer:focus-within{border-color:color-mix(in srgb, var(--accent) 45%, var(--line)); box-shadow:var(--shadow-lg)}
.composer textarea{
  display:block; width:100%; resize:none; border:0; outline:0; background:transparent; padding:4px 0 10px;
  font:400 17px/1.5 var(--sans); color:var(--ink); min-height:54px; max-height:220px;
}
.composer textarea::placeholder{color:var(--ink-3); opacity:.85}
.composer-bar{display:flex; align-items:center; gap:8px}
.seg{display:inline-flex; padding:3px; border-radius:10px; background:var(--surface-2); border:1px solid var(--line-2)}
.seg button{
  border:0; background:transparent; cursor:pointer; font:500 13px/1 var(--sans); color:var(--ink-3);
  padding:8px 11px; border-radius:7px; min-height:28px; transition:background .15s, color .15s;
}
.seg button[aria-checked="true"]{background:var(--surface); color:var(--ink); box-shadow:var(--shadow-sm)}
.send{
  width:38px; height:38px; border-radius:11px; border:0; cursor:pointer; flex:none; display:grid; place-items:center;
  background:var(--btn); color:var(--btn-fg); transition:transform .18s var(--ease), opacity .18s;
}
.send svg{width:18px; height:18px}
.send:hover{transform:translateY(-1px)}
.send:disabled{opacity:.35; cursor:default; transform:none}
.hint{margin-top:9px; text-align:center; font-size:12px; color:var(--ink-3)}
@media (max-width:560px){
  .composer{padding:12px 12px 10px 14px}
  .hint{display:none}
  .picker-label{max-width:104px}
}
@media (hover:none){.hint{display:none}}

/* Course picker */
.picker{position:relative; margin-right:auto; min-width:0}
.picker-btn{
  display:inline-flex; align-items:center; gap:7px; min-height:34px; max-width:100%; cursor:pointer;
  padding:0 10px 0 10px; border-radius:9px; border:1px solid var(--line-2); background:var(--surface-2);
  font:500 13px/1 var(--sans); color:var(--ink-2); transition:color .15s, border-color .15s, background .15s;
}
.picker-btn:hover{color:var(--ink); border-color:var(--line)}
.picker-btn svg{width:15px; height:15px; flex:none}
.picker-btn .chev{width:14px; height:14px; color:var(--ink-3); transition:transform .2s var(--ease)}
.picker-btn[aria-expanded="true"] .chev{transform:rotate(180deg)}
.picker-btn.on{background:var(--accent-soft); color:var(--accent-ink); border-color:transparent}
.picker-btn.on .chev{color:currentColor}
.picker-label{white-space:nowrap; overflow:hidden; text-overflow:ellipsis; max-width:240px}
.picker-pop{
  position:absolute; left:-6px; top:calc(100% + 8px); z-index:45; width:min(400px, calc(100vw - 32px));
  background:var(--surface); border:1px solid var(--line); border-radius:var(--r-md); box-shadow:var(--shadow-lg);
  display:flex; flex-direction:column; max-height:min(440px, 60vh); overflow:hidden;
}
body.has-thread .picker-pop{top:auto; bottom:calc(100% + 10px)}
.picker-head{display:flex; align-items:center; justify-content:space-between; gap:10px; padding:12px 14px 6px}
.picker-head .label{margin:0}
.link{border:0; background:none; padding:4px 2px; cursor:pointer; font:500 13px/1 var(--sans); color:var(--accent-ink)}
.link:hover{color:var(--accent)}
.picker-body{overflow-y:auto; overscroll-behavior:contain; padding:2px 6px 8px}
.sem{display:flex; align-items:center; justify-content:space-between; gap:8px; padding:12px 8px 6px; position:sticky; top:0; background:var(--surface); z-index:1}
.sem-name{font:600 12px/1 var(--mono); letter-spacing:.06em; text-transform:uppercase; color:var(--ink)}
.opt{
  display:grid; grid-template-columns:18px auto 1fr; align-items:center; gap:10px; padding:8px; border-radius:9px; cursor:pointer;
  transition:background .12s;
}
.opt:hover{background:var(--surface-2)}
.opt input{appearance:none; -webkit-appearance:none; width:18px; height:18px; margin:0; border-radius:5px; border:1.5px solid color-mix(in srgb, var(--ink) 28%, transparent); display:grid; place-items:center; cursor:pointer; transition:background .12s, border-color .12s}
.opt input::after{content:""; width:9px; height:5px; border-left:2px solid #fff; border-bottom:2px solid #fff; transform:translateY(-1px) rotate(-45deg); opacity:0}
.opt input:checked{background:var(--accent); border-color:var(--accent)}
.opt input:checked::after{opacity:1}
.opt input:focus-visible{outline:2px solid var(--accent); outline-offset:2px}
.opt-code{font:600 12.5px/1 var(--mono); color:var(--accent-ink); white-space:nowrap}
.opt-name{font-size:13.5px; line-height:1.3; color:var(--ink-2); min-width:0; overflow:hidden; text-overflow:ellipsis; white-space:nowrap}
.opt-n{display:none}
.picker-foot{display:flex; align-items:center; justify-content:space-between; gap:10px; padding:10px 14px; border-top:1px solid var(--line-2)}
.picker-count{font:500 12px/1.3 var(--mono); color:var(--ink-3)}
@media (max-width:560px){
  .picker-pop, body.has-thread .picker-pop{position:fixed; left:12px; right:12px; top:auto; bottom:max(12px, env(safe-area-inset-bottom)); width:auto; max-height:70vh}
}

/* Thread mode: the composer docks to the bottom of the screen. */
body.has-thread .hero, body.has-thread .home{display:none}
body.has-thread .dock{
  position:sticky; bottom:0; z-index:30; padding-block:14px max(12px, env(safe-area-inset-bottom));
  background:linear-gradient(to bottom, transparent, var(--bg) 26px);
}
body.has-thread .dock .hint{display:none}
body.has-thread .composer textarea{min-height:28px; font-size:16px; padding-bottom:8px}
body.has-thread main{justify-content:flex-start}

/* ------------------------------------------------------------ home */
.home{padding-block:30px 72px}
.label{font:500 11.5px/1 var(--mono); letter-spacing:.08em; text-transform:uppercase; color:var(--ink-3); margin-bottom:12px}
.suggest-list{display:flex; flex-wrap:wrap; gap:8px}
.library{margin-top:48px}
.lib-head{display:flex; align-items:baseline; justify-content:space-between; gap:12px; margin-bottom:14px; flex-wrap:wrap}
.lib-total{font:500 12.5px/1.4 var(--mono); color:var(--ink-3)}
.tiles-grid{display:grid; grid-template-columns:repeat(auto-fill, minmax(220px, 1fr)); gap:10px}
.tile{
  display:flex; flex-direction:column; gap:6px; text-align:left; cursor:pointer; min-height:88px;
  background:var(--surface); border:1px solid var(--line); border-radius:var(--r-md); padding:14px 15px 13px;
  transition:border-color .15s, transform .18s var(--ease), box-shadow .18s;
}
.lib-sem{margin:22px 0 10px; font:600 12px/1 var(--mono); letter-spacing:.06em; text-transform:uppercase; color:var(--ink-3)}
.lib-sem:first-child{margin-top:0}
.tile.on{border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-soft)}
.tile:hover{border-color:color-mix(in srgb, var(--ink) 26%, transparent); transform:translateY(-2px); box-shadow:var(--shadow-md)}
.tile-top{display:flex; justify-content:space-between; align-items:center; gap:8px}
.tile-code{font:600 13px/1 var(--mono); color:var(--accent-ink); letter-spacing:.01em}
.tile-n{font:500 11.5px/1 var(--mono); color:var(--ink-3)}
.tile-name{color:var(--ink); font-weight:560; font-size:14.5px; line-height:1.3; letter-spacing:-.01em}
.tile-term{margin-top:auto; font-size:12.5px; color:var(--ink-3)}

/* ------------------------------------------------------------ thread */
.thread{display:none; padding-top:28px}
body.has-thread .thread{display:block; flex:1}
.turn{padding-bottom:36px; margin-bottom:36px; border-bottom:1px solid var(--line-2); scroll-margin-top:84px}
.turn:last-child{border-bottom:0; margin-bottom:0}
.turn-q{font-size:clamp(22px,3.2vw,28px); font-weight:600; letter-spacing:-.03em; line-height:1.18; color:var(--ink); max-width:32ch}
.turn-filters{display:flex; gap:6px; flex-wrap:wrap; margin-top:10px}
.status{
  display:flex; align-items:center; gap:9px; margin-top:18px; font:500 12.5px/1.3 var(--mono); color:var(--ink-3);
}
.status .spin{width:12px; height:12px; border-radius:50%; border:1.5px solid var(--line); border-top-color:var(--accent); flex:none}
@media (prefers-reduced-motion:no-preference){.status .spin{animation:spin .8s linear infinite}}
@keyframes spin{to{transform:rotate(360deg)}}
.status .done-dot{width:7px; height:7px; border-radius:50%; background:var(--ok); flex:none}
.status .done-dot.warn{background:var(--warn)}

.answer{margin-top:16px}
.answer.streaming .md > :last-child::after{
  content:""; display:inline-block; width:7px; height:1.05em; margin-left:2px; vertical-align:-2px;
  background:var(--accent); border-radius:1px;
}
@media (prefers-reduced-motion:no-preference){.answer.streaming .md > :last-child::after{animation:blink 1s steps(2) infinite}}
@keyframes blink{50%{opacity:0}}

.md{color:var(--ink-2); font-size:16.5px; line-height:1.68; overflow-wrap:anywhere}
.md > * + *{margin-top:12px}
.md strong{color:var(--ink); font-weight:620}
.md h4{font-size:15px; color:var(--ink); letter-spacing:-.01em; margin-top:22px}
.md ul, .md ol{padding-left:1.25em; margin:12px 0 0}
.md li + li{margin-top:6px}
.md li::marker{color:var(--ink-3)}
.md code{font:500 .88em var(--mono); background:var(--surface-2); padding:2px 5px; border-radius:5px}
.md table{border-collapse:collapse; font-size:14px; display:block; overflow-x:auto; max-width:100%}
.md th, .md td{border:1px solid var(--line); padding:6px 10px; text-align:left; vertical-align:top}
.md th{background:var(--surface-2); color:var(--ink); font-weight:600}
.md hr{border:0; border-top:1px solid var(--line); margin:20px 0}
.beyond{
  margin-top:20px; padding:14px 16px; border-radius:var(--r-md); background:var(--surface-2); border:1px dashed var(--line);
}
.beyond > * + *{margin-top:10px}
.beyond-label{font:500 11px/1 var(--mono); letter-spacing:.08em; text-transform:uppercase; color:var(--ink-3)}

.cite{
  display:inline-grid; place-items:center; min-width:19px; height:19px; padding:0 5px; margin:0 1px;
  vertical-align:2px; border-radius:6px; border:0; cursor:pointer;
  background:var(--accent-soft); color:var(--accent-ink); font:600 11px/1 var(--mono);
  transition:background .15s, color .15s;
}
.cite:hover, .cite.hot{background:var(--accent); color:#fff}

.notice{
  margin-top:16px; padding:14px 16px; border-radius:var(--r-md); font-size:14.5px; line-height:1.55;
  background:var(--warn-soft); color:var(--ink-2); border:1px solid color-mix(in srgb, var(--warn) 25%, transparent);
}
.notice strong{color:var(--ink)}
.notice--plain{background:var(--surface-2); border-color:var(--line-2)}

.actions{display:flex; gap:8px; flex-wrap:wrap; margin-top:18px}

.sources{margin-top:26px}
.sources-head{display:flex; align-items:baseline; justify-content:space-between; gap:10px; margin-bottom:10px}
.sources-list{display:grid; gap:8px; counter-reset:src}
.src{
  display:grid; grid-template-columns:auto 1fr; gap:4px 12px; text-align:left; width:100%; cursor:pointer;
  background:var(--surface); border:1px solid var(--line); border-radius:var(--r-md); padding:12px 14px;
  transition:border-color .15s, box-shadow .18s, transform .18s var(--ease);
}
.src:hover{border-color:color-mix(in srgb, var(--ink) 24%, transparent); box-shadow:var(--shadow-sm)}
.src.hot{border-color:var(--accent); box-shadow:0 0 0 3px var(--accent-soft)}
.src-n{
  grid-row:span 3; width:24px; height:24px; border-radius:7px; display:grid; place-items:center; margin-top:1px;
  background:var(--surface-2); color:var(--ink-2); font:600 12px/1 var(--mono); border:1px solid var(--line-2);
}
.src-top{display:flex; align-items:center; gap:6px; flex-wrap:wrap; min-width:0}
.src-title{color:var(--ink); font-weight:580; font-size:15px; letter-spacing:-.01em; line-height:1.35}
.src-where{font-size:12.5px; color:var(--ink-3); line-height:1.4}
.src-snip{grid-column:2; font-size:14px; line-height:1.55; color:var(--ink-2); margin-top:4px;
  display:-webkit-box; -webkit-line-clamp:3; -webkit-box-orient:vertical; overflow:hidden}
mark{background:var(--mark); color:var(--ink); border-radius:3px; padding:0 2px}
.sources.collapsed .src:nth-child(n+5){display:none}
.more{margin-top:10px}

/* ------------------------------------------------------------ reader */
.reader{position:fixed; inset:0; z-index:60; visibility:hidden}
.reader.open{visibility:visible}
.reader-scrim{position:absolute; inset:0; background:rgba(10,10,12,.38); opacity:0; transition:opacity .25s}
.reader.open .reader-scrim{opacity:1}
.reader-panel{
  position:absolute; top:0; right:0; bottom:0; width:min(720px, 100%); overflow-y:auto; overscroll-behavior:contain;
  background:var(--bg); border-left:1px solid var(--line); box-shadow:var(--shadow-lg);
  padding:0 clamp(18px,4vw,40px) 64px; transform:translateX(24px); opacity:0;
  transition:transform .3s var(--ease), opacity .25s; outline:0;
}
.reader.open .reader-panel{transform:none; opacity:1}
.reader-head{
  position:sticky; top:0; z-index:2; display:flex; align-items:center; justify-content:space-between; gap:10px;
  padding:14px 0; background:var(--bg); border-bottom:1px solid var(--line-2);
}
.reader-meta{display:flex; gap:6px; flex-wrap:wrap}
.reader-title{font-size:clamp(24px,3.4vw,32px); letter-spacing:-.03em; line-height:1.12; margin-top:8px}
.reader-sub{margin-top:10px; font-size:13.5px; color:var(--ink-3)}
.reader-sub a{color:var(--ink-3)}
.reader-body{margin-top:26px}
.passage .md > .passage-loc{margin-top:18px}
.passage .md > .passage-loc:first-child{margin-top:0}
.passage{padding:14px 0 14px 18px; margin-left:-18px; border-left:2px solid transparent; scroll-margin-top:90px}
.passage + .passage{border-top:1px solid var(--line-2)}
.passage.hit{border-left-color:var(--accent); background:linear-gradient(to right, var(--accent-soft), transparent 45%)}
.passage-loc{font:500 11.5px/1 var(--mono); letter-spacing:.04em; text-transform:uppercase; color:var(--ink-3); margin-bottom:10px}
.passage.hit .passage-loc{color:var(--accent-ink)}
@media (max-width:560px){.passage{padding-left:14px; margin-left:-14px}}

/* ------------------------------------------------------------ toast */
.toast{
  position:fixed; left:50%; bottom:max(24px, env(safe-area-inset-bottom)); z-index:80; transform:translate(-50%, 16px);
  max-width:calc(100% - 32px); padding:11px 16px; border-radius:12px; background:var(--btn); color:var(--btn-fg);
  font-size:14px; box-shadow:var(--shadow-lg); opacity:0; pointer-events:none; transition:opacity .2s, transform .25s var(--ease);
}
.toast.show{opacity:1; transform:translate(-50%, 0)}

@media (prefers-reduced-motion:reduce){*{transition:none!important; animation:none!important}}