:root{
  --bg:#f5f6f8;
  --surface:#fff;
  --surface-2:#f8f9fa;
  --ink:#1f1f1f;
  --soft:#3c4043;
  --muted:#5f6368;
  --line:#e1e4e8;
  --line-strong:#cfd4da;
  --accent:#1a73e8;
  --accent-ink:#174ea6;
  --accent-soft:#e8f0fe;
  --warm:#fbfaf7;
  --radius:16px;
  --shadow:0 1px 2px rgba(60,64,67,.08), 0 14px 34px -26px rgba(60,64,67,.5);
  --sans:"Google Sans","Segoe UI",system-ui,-apple-system,Roboto,Arial,sans-serif;
  --serif:"Source Serif 4","Iowan Old Style","Palatino Linotype",Palatino,Georgia,serif;
  --mono:"Cascadia Mono",Consolas,"Courier New",monospace;
}
*{box-sizing:border-box}
[hidden]{display:none !important}
html,body{min-height:100%}
body{
  margin:0;background:radial-gradient(1300px 600px at 50% -14%,#fff 0%,rgba(255,255,255,0) 62%),var(--bg);
  color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;
}
button,input,textarea{font:inherit}
button{cursor:pointer}
button:disabled{opacity:.45;cursor:not-allowed}
:focus-visible{outline:3px solid var(--accent-soft);outline-offset:2px}
code{font-family:var(--mono);font-size:.9em;background:var(--surface-2);padding:1px 5px;border-radius:4px}
.muted{color:var(--muted)}
.fine{font-size:11.5px;line-height:1.5;color:var(--muted);margin:10px 0 0}
.screen.center{min-height:100vh;display:grid;place-items:center;padding:28px 20px;text-align:center}
.boot-mark,.wordmark{font-family:var(--serif);font-size:34px;letter-spacing:-.045em;line-height:1}
.boot-mark span,.wordmark span{color:var(--accent)}
.card{background:var(--surface);border:1px solid var(--line);border-radius:24px;box-shadow:var(--shadow);padding:34px}
.card.narrow{width:min(440px,100%)}
.login-card{text-align:left}
.eyebrow{display:block;font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted);margin:22px 0 0}
.card h1{font-family:var(--serif);font-weight:400;font-size:42px;letter-spacing:-.04em;line-height:1;margin:8px 0 12px}
.stack{display:flex;flex-direction:column;gap:8px;margin-top:20px}
.stack label{font-size:11px;font-family:var(--mono);letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.stack input{
  height:48px;border:1px solid var(--line-strong);border-radius:12px;background:#fff;
  padding:0 14px;font-size:15px;color:var(--ink);outline:none;
}
.stack input:focus{border-color:var(--accent);box-shadow:0 0 0 3px var(--accent-soft)}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;min-height:46px;padding:0 18px;
  border-radius:999px;border:1px solid transparent;font-size:14px;font-weight:600;transition:background .15s,border-color .15s;
}
.btn-primary{background:var(--ink);color:#fff}
.btn-primary:hover{background:#000}
.btn-ghost{background:transparent;border-color:var(--line-strong);color:var(--ink)}
.btn-ghost:hover{background:#fff;border-color:var(--ink)}
.or{display:flex;align-items:center;gap:12px;margin:20px 0;color:var(--muted);font-size:11px;text-transform:uppercase;letter-spacing:.12em}
.or::before,.or::after{content:"";height:1px;background:var(--line);flex:1}
.note{font-size:12px;color:var(--muted);min-height:18px;margin:14px 0 0;line-height:1.5}

/* app */
.appbar{position:sticky;top:0;z-index:20;background:rgba(245,246,248,.9);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.appbar-inner{max-width:1440px;margin:0 auto;padding:13px clamp(20px,2.6vw,40px);display:flex;align-items:center;gap:16px;flex-wrap:wrap}
.brand{display:flex;align-items:center;gap:12px;min-width:0}
.mark{width:40px;height:40px;border-radius:12px;display:grid;place-items:center;background:var(--ink);color:#fff;font-family:var(--serif);font-size:23px;line-height:1;flex:0 0 auto}
.brand strong{display:block;font-size:18px;line-height:1.2;font-weight:600}
.brand small{display:block;font-size:12px;color:var(--muted);margin-top:3px}
.status{margin-left:auto;display:flex;align-items:center;gap:8px;flex-wrap:wrap}
.pill{font-size:11px;color:var(--muted);border:1px solid var(--line-strong);border-radius:999px;padding:8px 11px;background:#fff;white-space:nowrap}
.pill.on{color:#137333;border-color:#b7dfc3;background:#eef8f0}
.pill.warn{color:#b3261e;border-color:#f0c4c0;background:#fdf2f1}
.user{font-size:12px;color:var(--muted);max-width:220px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.icon-btn{width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:#fff;color:var(--soft);font-size:18px;line-height:1}
.icon-btn:hover{background:var(--surface-2);border-color:var(--line-strong)}
.shell{max-width:1440px;margin:0 auto;padding:20px clamp(20px,2.6vw,40px) 36px}
.resume{font-size:12px;color:var(--muted);margin:0 0 12px}
.workspace{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(360px,1fr);gap:22px;align-items:start}
.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);box-shadow:var(--shadow)}
.panel-head{display:flex;align-items:flex-start;gap:14px;justify-content:space-between;padding:18px 22px 0}
.panel h2{font-size:16px;line-height:1.2;margin:0;font-weight:600}
.panel-meta{display:flex;align-items:center;gap:10px;flex-wrap:wrap;justify-content:flex-end}
.kicker{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);white-space:nowrap}
.input-panel{display:flex;flex-direction:column;min-height:472px;transition:border-color .15s,box-shadow .15s}
.input-panel:focus-within{border-color:#b9cff7;box-shadow:0 0 0 3px var(--accent-soft)}
.input-panel textarea{display:block;width:100%;flex:1;min-height:300px;max-height:56vh;resize:vertical;border:0;outline:none;background:transparent;color:var(--ink);font-family:var(--serif);font-size:20px;line-height:1.72;padding:12px 22px 4px;caret-color:var(--accent)}
.input-panel textarea::placeholder{color:#9aa0a6}
.input-foot{display:flex;align-items:center;gap:14px;flex-wrap:wrap;border-top:1px solid var(--line);margin:8px 22px 0;padding:11px 0 13px;font-size:11.5px;color:var(--muted)}
.input-foot .state{color:var(--soft);font-weight:600}
.input-foot .spacer{flex:1}
.save-local.ok{color:#137333}
.save-local.warn{color:#b3261e}
.reaction-panel{display:flex;flex-direction:column;min-height:472px;position:sticky;top:82px;max-height:calc(100vh - 100px);background:linear-gradient(180deg,#fff 0%,var(--warm) 100%);transition:border-color .15s,box-shadow .15s}
.reaction-panel.is-loading{border-color:#b9cff7;box-shadow:0 0 0 3px var(--accent-soft)}
.reaction-body{flex:1;min-height:128px;overflow:auto;padding:10px 22px 4px}
.reaction-text{font-family:var(--serif);font-size:clamp(20px,.4vw,27px);line-height:1.5;margin:4px 0 8px;white-space:pre-wrap;overflow-wrap:anywhere;transition:opacity .15s}
.reaction-panel.is-loading .reaction-text{opacity:.45}
.reaction-form{font-size:13.5px;line-height:1.55;color:var(--muted);font-style:italic;white-space:pre-wrap;margin:0 0 8px}
.reaction-foot{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:0 22px 16px;font-size:11.5px;color:var(--muted)}
.live-dot{width:7px;height:7px;border-radius:50%;background:var(--accent);opacity:0;transition:opacity .15s;flex:0 0 auto}
.live-dot.on{opacity:1;animation:pulse 1s ease-in-out infinite}
@keyframes pulse{0%,100%{transform:scale(.8);opacity:.45}50%{transform:scale(1.15);opacity:1}}
.retry{border:1px solid var(--line-strong);background:#fff;color:var(--accent-ink);border-radius:8px;min-height:40px;padding:0 14px;font-size:12px;font-weight:600}
.retry:hover{background:var(--accent-soft);border-color:#b9cff7}
.think-toggle{position:relative;display:inline-flex;align-items:center;gap:7px;cursor:pointer;user-select:none;min-height:32px}
.think-toggle input{position:absolute;width:1px;height:1px;opacity:0;margin:0}
.think-track{width:34px;height:20px;border-radius:999px;background:#d7dbe0;position:relative;flex:0 0 auto;transition:background .15s}
.think-thumb{position:absolute;top:2px;left:2px;width:16px;height:16px;border-radius:50%;background:#fff;box-shadow:0 1px 2px rgba(0,0,0,.2);transition:transform .15s}
.think-toggle input:checked + .think-track{background:var(--accent)}
.think-toggle input:checked + .think-track .think-thumb{transform:translateX(14px)}
.think-toggle input:focus-visible + .think-track{outline:3px solid var(--accent-soft);outline-offset:2px}
.think-label{font-family:var(--mono);font-size:10px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.think-toggle input:checked ~ .think-label{color:var(--accent-ink)}
.timeline-panel{margin-top:22px;min-height:240px}
.timeline{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;padding:18px 22px 22px}
.timeline-empty{padding:28px 22px 34px;color:var(--muted);font-size:13px}
.tcard{border:1px solid var(--line);border-radius:12px;padding:14px;background:#fff;min-width:0}
.tcard .thead{display:flex;gap:8px;align-items:center;justify-content:space-between;margin-bottom:8px}
.tcard .when{font-family:var(--mono);font-size:9px;color:var(--muted);white-space:nowrap}
.tcard p{font-family:var(--serif);font-size:13.5px;line-height:1.45;color:var(--soft);margin:0;display:-webkit-box;-webkit-line-clamp:5;-webkit-box-orient:vertical;overflow:hidden}
.tcard .view{margin-top:10px;border:0;background:transparent;padding:0;color:var(--accent-ink);font-size:11px;font-weight:600}
.tcard .view:hover{text-decoration:underline}
.foot{max-width:1440px;margin:0 auto;padding:24px clamp(20px,2.6vw,40px) 34px;font-size:11.5px;color:var(--muted)}
.dialog{border:0;padding:0;background:transparent;max-width:min(680px,calc(100vw - 28px));width:100%}
.dialog::backdrop{background:rgba(20,20,19,.38);backdrop-filter:blur(3px)}
.dialog-card{background:#fff;border-radius:20px;box-shadow:0 24px 80px rgba(0,0,0,.25);padding:24px;max-height:86vh;overflow:auto}
.dialog-head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;margin-bottom:18px}
.dialog-head h2{font-family:var(--serif);font-weight:400;font-size:30px;letter-spacing:-.03em;margin:4px 0 0}
.dialog-close{width:40px;height:40px;border-radius:50%;border:1px solid var(--line);background:#fff;font-size:22px;line-height:1;color:var(--muted)}
.dialog-section{border-top:1px solid var(--line);padding:18px 0 4px}
.dialog-section h3{font-size:14px;margin:0 0 6px}
.actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:12px}
.link-btn{border:0;background:transparent;padding:0;margin-top:12px;color:var(--accent-ink);font-size:12px;font-weight:600}
.link-btn:hover{text-decoration:underline}
.detail-meta{font-family:var(--mono);font-size:10px;color:var(--muted);margin-bottom:12px}
.detail-content{font-family:var(--serif);font-size:16px;line-height:1.6;white-space:pre-wrap;overflow-wrap:anywhere;margin:0;color:var(--soft)}
@media (max-width:1050px){.workspace{grid-template-columns:1fr}.reaction-panel{position:static;max-height:none}.timeline{grid-template-columns:repeat(2,minmax(0,1fr))}.brand small{display:none}}
@media (max-width:620px){
  .shell{padding-left:16px;padding-right:16px}
  .appbar-inner{padding-left:16px;padding-right:16px}
  .user{display:none}
  .panel-head{padding:16px 16px 0}
  .input-panel textarea{padding-left:16px;padding-right:16px}
  .input-foot{margin-left:16px;margin-right:16px}
  .reaction-body{padding-left:16px;padding-right:16px}
  .reaction-foot{padding-left:16px;padding-right:16px}
  .timeline{grid-template-columns:1fr;padding-left:16px;padding-right:16px}
  .brand strong{font-size:16px}
  .status{gap:6px}
}
@media (prefers-reduced-motion:reduce){.live-dot.on{animation:none}}