:root {
  --bg: #f4f5f7; --card: #ffffff; --ink: #1c2430; --muted: #5d6b7c; --line: #d9dee5;
  --accent: #9b1c1c; --accent-ink: #ffffff; --soft: #fbf3f3; --warn: #fff6dc; --warn-line: #e6c453;
  --danger: #b42318;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181d; --card: #1d232b; --ink: #e7ebf0; --muted: #9aa7b6; --line: #333c48;
    --accent: #e06a6a; --accent-ink: #14181d; --soft: #2a2023; --warn: #3a3218; --warn-line: #8c7424;
    --danger: #f1857b;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.55 system-ui, "Segoe UI", Roboto, Arial, sans-serif; }
a { color: var(--accent); }
h1 { font-size: 1.5rem; margin: 0 0 .75rem; }
h2 { font-size: 1.1rem; margin: 1.5rem 0 .5rem; }
main { max-width: 1040px; margin: 0 auto; padding: 1.25rem 16px 4rem; }

.top { display: flex; flex-wrap: wrap; align-items: center; gap: .25rem 1rem; padding: .6rem 16px;
  background: var(--card); border-bottom: 1px solid var(--line); position: sticky; top: 0; z-index: 5; }
.brand { font-weight: 700; color: var(--ink); text-decoration: none; margin-right: .5rem; }
.top nav { display: flex; flex-wrap: wrap; gap: .1rem .25rem; flex: 1; }
.top nav a { padding: .3rem .55rem; border-radius: 6px; color: var(--ink); text-decoration: none; font-size: .95rem; }
.top nav a:hover, .top nav a.on { background: var(--soft); color: var(--accent); }

.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1rem 1.1rem; margin: 0 0 1rem; }
.card.narrow { max-width: 380px; margin: 12vh auto 0; }
.card h2 { margin-top: 0; }
label { display: block; font-weight: 600; font-size: .92rem; margin: 0 0 .9rem; }
input, select, textarea { display: block; width: 100%; margin-top: .3rem; padding: .55rem .65rem; font: inherit; font-weight: 400;
  color: var(--ink); background: var(--bg); border: 1px solid var(--line); border-radius: 7px; }
input[type=checkbox] { display: inline; width: auto; margin: 0 .4rem 0 0; }
input[type=file] { padding: .4rem; }
textarea { resize: vertical; }
input:focus, select:focus, textarea:focus, button:focus-visible, a:focus-visible { outline: 2px solid var(--accent); outline-offset: 1px; }
fieldset { border: 1px solid var(--line); border-radius: 7px; margin: 0 0 .9rem; padding: .5rem .8rem .7rem; }
legend { font-weight: 600; font-size: .92rem; padding: 0 .3rem; }
.checks { max-height: 220px; overflow: auto; }
.check { font-weight: 400; margin: .25rem 0; }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 0 1rem; }

button, .button { display: inline-block; padding: .5rem .95rem; font: inherit; font-weight: 600; border-radius: 7px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); cursor: pointer; text-decoration: none; }
.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.ghost:hover { border-color: var(--accent); color: var(--accent); }
.danger { color: var(--danger); border-color: var(--danger); background: transparent; }
.danger-text { color: var(--danger); }
.link { border: 0; background: none; padding: 0; color: var(--accent); font-weight: 400; text-decoration: underline; }
button[disabled] { opacity: .55; cursor: progress; }
.row { display: flex; flex-wrap: wrap; gap: .5rem; align-items: center; margin: 0 0 1rem; }
.row input { width: auto; flex: 1; min-width: 200px; margin: 0; }
.status { margin-left: .6rem; color: var(--muted); font-size: .92rem; }
.status.error { color: var(--danger); font-weight: 600; }

.flash, .warn { padding: .6rem .85rem; border-radius: 8px; margin: 0 0 1rem; }
.flash { background: var(--soft); border: 1px solid var(--line); }
.warn { background: var(--warn); border: 1px solid var(--warn-line); }
.muted { color: var(--muted); font-size: .92rem; font-weight: 400; }
.hidden { display: none; }

.tiles { display: grid; grid-template-columns: repeat(auto-fill, minmax(170px, 1fr)); gap: .7rem; margin: 0 0 1rem; }
.tile { display: block; padding: .9rem 1rem; background: var(--card); border: 1px solid var(--line); border-radius: 10px;
  text-decoration: none; color: var(--ink); }
a.tile:hover { border-color: var(--accent); }
.tile strong { display: block; font-size: 1.05rem; }
.tile span { color: var(--muted); font-size: .88rem; }
.tile.alt { background: var(--soft); }
.tile.stat strong { font-size: 1.35rem; }

table { width: 100%; border-collapse: collapse; background: var(--card); border: 1px solid var(--line); margin: 0 0 1rem; }
th, td { text-align: left; padding: .55rem .75rem; border-bottom: 1px solid var(--line); vertical-align: top; font-size: .95rem; }
th { font-size: .82rem; color: var(--muted); text-transform: uppercase; letter-spacing: .03em; }
tbody tr:last-child td { border-bottom: 0; }
td form { margin: 0; }

.paper { font: 15.5px/1.6 "Times New Roman", Times, serif; white-space: pre-wrap; overflow-wrap: anywhere; }
pre.paper { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1.2rem 1.4rem; margin: 0; min-height: 4rem; }
pre.plain { font: inherit; white-space: pre-wrap; overflow-wrap: anywhere; margin: 0; }
details summary { cursor: pointer; font-weight: 600; }
details pre { margin-top: .6rem; }

.split { display: grid; grid-template-columns: minmax(0, 1fr) 250px; gap: 1.2rem; align-items: start; }
.split aside h2 { margin-top: 1rem; }
.chat-link { display: block; padding: .35rem .5rem; border-radius: 6px; color: var(--ink); text-decoration: none; font-size: .92rem;
  overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.chat-link:hover, .chat-link.on { background: var(--soft); color: var(--accent); }
.msg { border: 1px solid var(--line); border-radius: 10px; padding: .75rem .95rem; margin: 0 0 .8rem; background: var(--card); }
.msg.user { background: var(--soft); margin-left: 12%; }
.msg form { margin-top: .5rem; }
@media (max-width: 760px) { .split { grid-template-columns: 1fr; } .msg.user { margin-left: 0; } }