:root{
  /* client direction: safety orange on deep charcoal, off-white text, muted slate surfaces */
  --accent:#ff6a1a; --accent-hi:#ff8a45; --accent-ink:#1a0d00;
  --bg:#12151b; --surface:#1b212b; --surface-2:#232b37; --text:#f3f1ec; --muted:#9aa6b4; --border:#2b3441;
  --danger:#ff5a5a; --ok:#4ecb8b;
  --font-display:'IBM Plex Sans', system-ui, sans-serif;
  --font-sans:'IBM Plex Sans', system-ui, sans-serif;
  --font-num:'IBM Plex Mono', ui-monospace, monospace;
  --fs-xs:0.75rem; --fs-sm:0.875rem; --fs-base:1rem; --fs-lg:1.15rem; --fs-xl:1.4rem; --fs-2xl:1.7rem; --fs-3xl:2.1rem;
  --lh-tight:1.18; --lh-body:1.55;
  --sp-1:2px; --sp-2:4px; --sp-3:6px; --sp-4:8px; --sp-6:12px; --sp-8:16px; --sp-12:24px; --sp-16:32px;
  --radius:12px; --radius-sm:8px; --shadow:0 1px 0 rgba(0,0,0,.25), 0 8px 24px rgba(0,0,0,.18);
  --rail:64px;
}
*{box-sizing:border-box}
html,body{height:100%}
body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-sans);font-size:var(--fs-base);line-height:var(--lh-body);-webkit-text-size-adjust:100%}
.hidden{display:none !important}
.dim{color:var(--muted);font-weight:400}
h1,h2,h3{font-family:var(--font-display);line-height:var(--lh-tight);margin:0}
svg{width:22px;height:22px;fill:none;stroke:currentColor;stroke-width:1.9;stroke-linecap:round;stroke-linejoin:round}

/* ---------- buttons ---------- */
.btn{font:inherit;font-weight:600;border:1px solid transparent;border-radius:var(--radius-sm);padding:12px 18px;cursor:pointer;color:var(--text);background:var(--surface-2);transition:transform .04s ease, background .15s ease, border-color .15s ease;min-height:48px}
.btn:active{transform:translateY(1px)}
.btn:focus-visible{outline:3px solid var(--accent-hi);outline-offset:2px}
.btn-primary{background:var(--accent);color:var(--accent-ink);border-color:var(--accent)}
.btn-primary:hover{background:var(--accent-hi)}
.btn-ghost{background:transparent;border-color:var(--border);color:var(--text)}
.btn-ghost:hover{border-color:var(--muted)}
.btn-danger{background:transparent;border-color:var(--danger);color:var(--danger)}
.btn-danger:hover{background:rgba(255,90,90,.12)}
.btn-block{width:100%}
.btn-lg{min-height:56px;font-size:var(--fs-lg);padding:14px 24px}
.btn-sm{min-height:42px;padding:9px 14px;font-size:var(--fs-sm)}
.btn:disabled{opacity:.5;cursor:not-allowed}
.linkish{background:none;border:none;color:var(--accent-hi);cursor:pointer;font:inherit;padding:6px 2px;text-decoration:underline;align-self:flex-start}
.linkish:focus-visible{outline:3px solid var(--accent-hi);outline-offset:2px;border-radius:4px}

/* ---------- fields ---------- */
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:var(--sp-8)}
.field>span{font-size:var(--fs-sm);font-weight:600;color:var(--muted)}
input,textarea,select{font:inherit;color:var(--text);background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:13px 14px;width:100%}
textarea{resize:vertical;line-height:var(--lh-body)}
input:focus,textarea:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(255,106,26,.22)}
.msg{min-height:1.2em;margin:8px 0 0;font-size:var(--fs-sm);color:var(--muted)}
.msg.error{color:var(--danger)}
.msg.good{color:var(--ok)}

/* ---------- auth ---------- */
.auth-screen{min-height:100dvh;display:flex;align-items:center;justify-content:center;padding:24px}
.auth-card{width:100%;max-width:380px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);padding:28px 24px}
.brand{display:flex;align-items:center;gap:10px;margin-bottom:6px}
.brand-mark{display:grid;place-items:center;width:38px;height:38px;border-radius:10px;background:var(--accent);color:var(--accent-ink);font-family:var(--font-display);font-weight:700;font-size:1.3rem}
.brand-name{font-family:var(--font-display);font-weight:700;font-size:var(--fs-2xl)}
.auth-tagline{color:var(--muted);margin:4px 0 22px;font-size:var(--fs-sm)}
.auth-actions{display:flex;flex-direction:column;gap:10px;margin-top:6px}
.auth-foot{color:var(--muted);font-size:var(--fs-xs);margin:18px 0 0;text-align:center}

/* ---------- workspace shell ---------- */
.workspace{min-height:100dvh;display:flex}
.rail{position:fixed;top:0;left:0;bottom:0;width:var(--rail);background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;align-items:stretch;padding:10px 0;z-index:20}
.rail-brand{display:grid;place-items:center;margin-bottom:12px}
.rail-brand .brand-mark{width:40px;height:40px}
.rail-btn{position:relative;background:none;border:none;color:var(--muted);display:flex;flex-direction:column;align-items:center;gap:3px;padding:11px 4px;cursor:pointer;font:inherit;font-size:10px;font-weight:600;letter-spacing:.02em}
.rail-btn span{font-size:10px}
.rail-btn:hover{color:var(--text);background:var(--surface-2)}
.rail-btn.is-active{color:var(--accent)}
.rail-btn.is-active::before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:3px;border-radius:0 3px 3px 0;background:var(--accent)}
.rail-btn:focus-visible{outline:2px solid var(--accent-hi);outline-offset:-2px}
.rail-logout{margin-top:auto;color:var(--muted)}

.work{flex:1;margin-left:var(--rail);padding:0 0 40px;max-width:900px}
.context-head{position:sticky;top:0;z-index:10;background:linear-gradient(var(--bg),var(--bg) 70%,rgba(18,21,27,.85));backdrop-filter:blur(6px);border-bottom:1px solid var(--border);padding:18px 24px 14px}
.ctx-title{font-size:var(--fs-2xl);font-weight:700}
.ctx-sub{color:var(--muted);margin:3px 0 0;font-size:var(--fs-sm)}
.views{padding:20px 24px}
.view{display:flex;flex-direction:column;gap:18px}

/* ---------- panels & components ---------- */
.panel{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}
.panel h2{font-size:var(--fs-lg);margin-bottom:6px}

.choice-grid{display:grid;grid-template-columns:1fr;gap:16px;margin-bottom:16px}
.choices{border:none;padding:0;margin:0}
.choices legend{font-size:var(--fs-sm);font-weight:600;color:var(--muted);padding:0;margin-bottom:8px}
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{position:relative}
.chip input{position:absolute;opacity:0;width:0;height:0}
.chip span{display:inline-block;padding:11px 15px;border:1px solid var(--border);border-radius:999px;background:var(--bg);color:var(--text);cursor:pointer;font-size:var(--fs-sm);font-weight:500;user-select:none;min-height:44px;display:flex;align-items:center}
.chip input:checked+span{background:var(--accent);color:var(--accent-ink);border-color:var(--accent);font-weight:600}
.chip input:focus-visible+span{outline:3px solid var(--accent-hi);outline-offset:2px}

.draft-bar{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.ai-note{margin:0;color:var(--muted);font-size:var(--fs-sm);background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:8px 12px}

.reply-head{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:12px;flex-wrap:wrap}
.reply-tools{display:flex;gap:8px}
.reply-panel textarea{background:var(--bg)}

/* ---------- saved list ---------- */
.saved-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:12px}
.saved-item{background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-sm);padding:14px}
.saved-meta{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-bottom:8px}
.saved-tag{font-size:var(--fs-xs);font-weight:600;color:var(--accent-hi);text-transform:uppercase;letter-spacing:.04em}
.saved-date{font-family:var(--font-num);font-size:var(--fs-xs);color:var(--muted)}
.saved-text{white-space:pre-wrap;word-break:break-word;margin:0 0 12px;color:var(--text)}
.saved-actions{display:flex;gap:8px;flex-wrap:wrap}

/* ---------- empty state ---------- */
.empty{text-align:center;padding:34px 16px;display:flex;flex-direction:column;align-items:center;gap:8px}
.empty-mark{width:72px;height:72px;border-radius:16px;display:grid;place-items:center;background:linear-gradient(135deg,rgba(255,106,26,.14),rgba(255,106,26,.04));border:1px solid var(--border);color:var(--accent);margin-bottom:6px}
.empty-mark svg{width:32px;height:32px}
.empty-title{font-family:var(--font-display);font-weight:700;font-size:var(--fs-lg);margin:0}
.empty-sub{color:var(--muted);margin:0;max-width:34ch}

/* ---------- settings ---------- */
.ai-status{background:var(--surface-2);border:1px solid var(--border);border-radius:var(--radius-sm);padding:10px 14px;font-size:var(--fs-sm);margin:12px 0 18px}
.ai-status.is-on{border-color:var(--ok);color:var(--ok)}
.ai-status.is-off{color:var(--muted)}
.settings-actions{display:flex;gap:10px;flex-wrap:wrap}

/* ---------- ai setup banner (owner nudge) ---------- */
.ai-banner{display:flex;align-items:center;gap:12px;background:var(--surface-2);border-bottom:1px solid var(--accent);color:var(--text);padding:12px 24px;font-size:var(--fs-sm)}
.ai-banner span{flex:1}
.ai-banner button{white-space:nowrap}

/* ---------- toast ---------- */
.toast{position:fixed;left:50%;bottom:80px;transform:translateX(-50%);background:var(--surface-2);color:var(--text);border:1px solid var(--accent);border-radius:999px;padding:12px 20px;font-size:var(--fs-sm);font-weight:600;z-index:40;box-shadow:var(--shadow)}
.sdk-down{position:fixed;inset:0;display:grid;place-items:center;text-align:center;padding:40px;background:var(--bg);color:var(--text);z-index:100;font-size:var(--fs-lg)}

/* ---------- responsive: rail -> bottom tab bar on phones ---------- */
@media (max-width:720px){
  .workspace{flex-direction:column}
  .work{margin-left:0;padding-bottom:88px;max-width:none}
  .context-head{padding:16px 16px 12px}
  .views{padding:16px 16px}
  .panel{padding:16px}
  .rail{top:auto;right:0;flex-direction:row;width:auto;height:66px;border-right:none;border-top:1px solid var(--border);padding:0;justify-content:space-around}
  .rail-brand{display:none}
  .rail-btn{flex:1;padding:8px 2px}
  .rail-btn svg{width:24px;height:24px}
  .rail-btn.is-active::before{left:12px;right:12px;top:0;bottom:auto;width:auto;height:3px;border-radius:0 0 3px 3px}
  .rail-logout{margin-top:0}
  .toast{bottom:86px}
}
@media (min-width:721px){
  .choice-grid{grid-template-columns:1fr 1fr}
}