/* Document Engine UI styles, copied verbatim from the live app (api.elvinpeters.com/docs/, 2026-10-01) for the public demo. */
:root{--ink:#1a1a1a;--muted:#5c5c5c;--line:#e3e3e3;--bg:#fafaf8;--card:#fff;--ok:#1d7a3a;--warn:#b45309;--bad:#b91c1c;--accent:#1f3a5f;--soft:#eef2f7}
*{box-sizing:border-box}
body{margin:0;font:15px/1.5 system-ui,Segoe UI,Roboto,sans-serif;color:var(--ink);background:var(--bg)}
header{background:var(--accent);color:#fff;padding:12px 18px;display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap}
header h1{font-size:17px;margin:0;font-weight:600} header small{opacity:.85;font-weight:400}
nav{display:flex;gap:4px;flex-wrap:wrap} nav button{background:transparent;color:#fff;border:1px solid rgba(255,255,255,.35);padding:6px 12px;border-radius:6px;cursor:pointer;font:inherit}
nav button.active{background:#fff;color:var(--accent)}
main{max-width:1180px;margin:0 auto;padding:18px}
section{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:16px;margin-bottom:16px}
h2{font-size:13px;margin:0 0 10px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted)}
table{width:100%;border-collapse:collapse;font-size:14px} th,td{text-align:left;padding:7px 8px;border-bottom:1px solid var(--line);vertical-align:top}
th{color:var(--muted);font-weight:600;font-size:12px;text-transform:uppercase;letter-spacing:.04em}
.pill{display:inline-block;padding:1px 8px;border-radius:99px;font-size:12px;border:1px solid var(--line);background:#f3f3f1;white-space:nowrap}
.ok{color:var(--ok)} .warn{color:var(--warn)} .bad{color:var(--bad)} .muted{color:var(--muted)} .small{font-size:12.5px}
button,input,select,textarea{font:inherit} button{background:var(--accent);color:#fff;border:0;border-radius:6px;padding:8px 14px;cursor:pointer}
button.secondary{background:#e9e9e6;color:var(--ink)} button.danger{background:var(--bad)} button:disabled{opacity:.5;cursor:default}
input[type=text],input[type=email],input[type=password],input[type=number],select,textarea{width:100%;padding:8px 10px;border:1px solid #c9c9c4;border-radius:6px;background:#fff;color:var(--ink)}
textarea{min-height:110px;resize:vertical}
pre{background:#f6f6f4;border:1px solid var(--line);border-radius:6px;padding:10px;overflow:auto;max-height:520px;white-space:pre-wrap;font-size:12.5px;color:var(--ink)}
.row{display:flex;gap:8px;align-items:center;margin-bottom:8px;flex-wrap:wrap} .row>*{flex:1 1 160px} .row>button{flex:0 0 auto}
.grid{display:grid;gap:16px;grid-template-columns:1fr 1fr} @media(max-width:820px){.grid{grid-template-columns:1fr} .hide-m{display:none}}
a{color:var(--accent)} .drop{border:2px dashed #b9c3d1;border-radius:8px;padding:22px;text-align:center;color:var(--muted);background:#fff}
.drop.over{background:var(--soft)} .bar{height:8px;background:#e5e7eb;border-radius:4px;overflow:hidden} .bar>i{display:block;height:100%;background:var(--accent);transition:width .3s}
.card-login{max-width:400px;margin:60px auto} .facts{font-size:12.5px;color:var(--muted)} .facts b{color:var(--ink)}
.art{background:#fff;border:1px solid var(--line);border-radius:8px;padding:18px;font-size:14.5px;line-height:1.55}
.art h1{font-size:20px} .art h2{font-size:16px;text-transform:none;letter-spacing:0;color:var(--ink);margin-top:18px} .art h3{font-size:14.5px}
.art table{margin:8px 0} .art .cite{font-size:11px;color:var(--accent);border:1px solid #c9d3e0;border-radius:4px;padding:0 4px;text-decoration:none;margin-left:2px}
.art .cite.dead{color:var(--muted);border-color:var(--line)} .credit{font-size:26px;font-weight:600}
[hidden]{display:none!important}
.modal{position:fixed;inset:0;background:rgba(0,0,0,.45);display:flex;align-items:center;justify-content:center;padding:16px;z-index:50}
.hero{max-width:980px;margin:40px auto 0;display:grid;grid-template-columns:1.3fr 1fr;gap:24px;align-items:start} @media(max-width:820px){.hero{grid-template-columns:1fr;margin-top:12px}}
.hero h1{font-size:30px;line-height:1.15;margin:0 0 12px;font-weight:650;color:var(--ink)} .hero p.lead{font-size:16.5px;color:var(--muted);margin:0 0 18px}
.steps{display:grid;gap:12px;grid-template-columns:repeat(3,1fr)} @media(max-width:820px){.steps{grid-template-columns:1fr}}
.step{background:var(--card);border:1px solid var(--line);border-radius:8px;padding:14px} .step b.n{display:inline-block;width:26px;height:26px;line-height:26px;text-align:center;border-radius:50%;background:var(--accent);color:#fff;font-size:13px;margin-bottom:8px}
.step h3{margin:0 0 4px;font-size:15px} .step p{margin:0;font-size:13.5px;color:var(--muted)}
.chips{display:flex;flex-wrap:wrap;gap:8px} .chips button{background:var(--soft);color:var(--accent);border:1px solid #c9d3e0;font-size:13.5px;text-align:left;padding:7px 12px}
.start{border-left:4px solid #f4c542}
.chat-wrap{display:grid;grid-template-columns:260px 1fr;gap:16px;align-items:start} @media(max-width:820px){.chat-wrap{grid-template-columns:1fr}}
.chat-list button{display:block;width:100%;text-align:left;background:#fff;color:var(--ink);border:1px solid var(--line);margin-bottom:6px;padding:8px 10px;border-radius:6px}
.chat-list button.active{border-color:var(--accent);background:var(--soft)} .chat-list .t{display:block;font-size:13.5px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}
.msgs{display:flex;flex-direction:column;gap:10px;min-height:240px;max-height:62vh;overflow:auto;padding:4px 2px}
.msg{max-width:88%;padding:10px 14px;border-radius:12px;font-size:14.5px;line-height:1.5} .msg.user{align-self:flex-end;background:var(--accent);color:#fff;border-bottom-right-radius:4px}
.msg.bot{align-self:flex-start;background:#fff;border:1px solid var(--line);border-bottom-left-radius:4px} .msg.bot p{margin:0 0 6px} .msg.bot table{margin:6px 0;font-size:13.5px}
.msg .meta{font-size:11.5px;color:var(--muted);margin-top:6px} .msg.user .meta{color:rgba(255,255,255,.75)} .thinking{font-size:12.5px;color:var(--muted);font-style:italic}
.chat-in{display:flex;gap:8px;margin-top:10px;align-items:flex-end} .chat-in textarea{min-height:44px;max-height:160px;flex:1} .empty{padding:26px;text-align:center;color:var(--muted)}
.art{padding:34px 42px;font-size:15px;line-height:1.62;max-width:920px;margin:0 auto;box-shadow:0 1px 4px rgba(20,30,50,.06)}
.art h1{font-size:25px;line-height:1.25;margin:0 0 12px;color:var(--accent)}
.art h2{font-size:17.5px;color:var(--accent);margin:28px 0 10px;padding-bottom:6px;border-bottom:1px solid #dfe5ee}
.art h3{font-size:15.5px;margin:20px 0 6px} .art h4{font-size:14.5px;margin:16px 0 4px}
.art p{margin:0 0 11px} .art ul,.art ol{margin:0 0 14px;padding-left:26px} .art li{margin:4px 0} .art li>ul,.art li>ol{margin:4px 0}
.art .tbl,.msg .tbl{overflow-x:auto;margin:10px 0 18px} .art table{border:1px solid var(--line);font-size:13.5px} .msg .tbl table{font-size:13px}
.art th,.msg th{background:var(--soft);color:var(--accent);text-transform:none;letter-spacing:0;font-size:12.5px}
.art tbody tr:nth-child(even) td{background:#fafbfc}
.art blockquote,.msg blockquote{margin:12px 0;padding:10px 16px;border-left:3px solid #c9d3e0;background:#f7f9fc;color:#333}
.art code,.msg code{background:#f1f1ee;border-radius:4px;padding:1px 5px;font-size:.9em}
.art hr{border:0;border-top:1px solid var(--line);margin:22px 0} .art i{color:#4a4a4a}
.cite.calc{color:var(--ok);border-color:#bfe0c9}
.files{display:flex;flex-wrap:wrap;gap:8px;margin:8px 0 14px} .files-h{font-size:12.5px;text-transform:uppercase;letter-spacing:.05em;color:var(--muted);margin:2px 0 0}
.file{display:inline-flex;align-items:center;gap:8px;padding:8px 12px;border:1px solid #c9d3e0;border-radius:8px;background:#fff;text-decoration:none;color:var(--ink);font-size:14px}
.file:hover{background:var(--soft)} .file .kind{font-size:10.5px;font-weight:700;letter-spacing:.04em;color:#fff;background:var(--accent);border-radius:4px;padding:2px 6px}
.btn-dl{display:inline-block;padding:6px 12px;border:1px solid #c9d3e0;border-radius:6px;background:#fff;text-decoration:none;font-size:13.5px}
@media(max-width:640px){.art{padding:18px 16px;font-size:14.5px}}
.toast{position:fixed;bottom:16px;left:50%;transform:translateX(-50%);background:#1a1a1a;color:#fff;padding:10px 16px;border-radius:8px;display:none;max-width:90vw}