:root {
  --bg: #f4f6f5; --surface: #ffffff; --text: #18201c; --muted: #64706a; --line: #dde3e0;
  --accent: #128c5e; --accent-text: #ffffff; --me: #e3f4ea;
  --ok: #157347; --warn: #9a6200; --bad: #b42318;
  --ok-bg: #e2f3ea; --warn-bg: #fdf1dc; --bad-bg: #fde7e5;
  --radius: 12px;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1512; --surface: #18201c; --text: #e7ece9; --muted: #95a29b; --line: #2a342f;
    --accent: #25b37b; --accent-text: #06120c; --me: #173426;
    --ok: #5fd39c; --warn: #f0b252; --bad: #ff8a80;
    --ok-bg: #133325; --warn-bg: #3a2b10; --bad-bg: #3d1915;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 15px/1.45 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
h1 { font-size: 1.35rem; margin: 0.4rem 0 0.6rem; }
h2 { font-size: 1.05rem; margin: 1.6rem 0 0.6rem; }
code { font-size: 0.9em; background: var(--line); padding: 0 4px; border-radius: 4px; }
main { max-width: 860px; margin: 0 auto; padding: 16px 16px 48px; }
.muted { color: var(--muted); }
.small { font-size: 0.85rem; }
.error { color: var(--bad); }

/* header */
.top {
  position: sticky; top: 0; z-index: 5; display: flex; align-items: center; gap: 12px;
  padding: 10px 16px; padding-top: max(10px, env(safe-area-inset-top));
  background: var(--surface); border-bottom: 1px solid var(--line);
}
.brand { font-weight: 700; color: var(--text); }
.top nav { display: flex; gap: 4px; flex: 1; }
.top nav a { padding: 6px 10px; border-radius: 8px; color: var(--muted); }
.top nav a.on { background: var(--bg); color: var(--text); font-weight: 600; }
.top form { margin: 0; }

/* controls */
button, .button {
  display: inline-block; border: 0; border-radius: 10px; padding: 10px 16px; cursor: pointer;
  background: var(--accent); color: var(--accent-text); font: inherit; font-weight: 600;
}
button.small, .button.small { padding: 6px 12px; font-size: 0.85rem; }
button.ghost, .button.ghost { background: transparent; color: var(--text); border: 1px solid var(--line); }
button.danger { background: var(--bad); color: #fff; }
input, select {
  font: inherit; color: var(--text); background: var(--surface);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; min-width: 0;
}
form.inline { display: inline; margin: 0; }
.stack { display: grid; gap: 10px; }
.row-form, .filters { display: flex; gap: 8px; flex-wrap: wrap; }
.row-form input, .filters input { flex: 1 1 180px; }
.actions { display: flex; gap: 8px; flex-wrap: wrap; }
.actions form { margin: 0; }

/* blocks */
.card { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 16px; margin: 12px 0; }
.card.narrow { max-width: 380px; margin: 12vh auto 0; }
.flash { background: var(--ok-bg); color: var(--ok); padding: 10px 14px; border-radius: 10px; margin-bottom: 12px; }
.banner { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; background: var(--warn-bg); padding: 10px 14px; border-radius: 10px; }
.notice { background: var(--warn-bg); color: var(--warn); padding: 10px 14px; border-radius: 10px; }
.pill, .tag { display: inline-block; border-radius: 999px; padding: 2px 10px; font-size: 0.8rem; font-weight: 600; background: var(--line); color: var(--muted); }
.pill.ok, .tag.ok { background: var(--ok-bg); color: var(--ok); }
.pill.warn, .tag.warn { background: var(--warn-bg); color: var(--warn); }
.pill.bad, .tag.bad { background: var(--bad-bg); color: var(--bad); }
.tag { font-weight: 500; padding: 1px 8px; }

.stats { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin: 12px 0; }
.stats > div { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; }
.stats b { display: block; font-size: 1.4rem; }
.stats span { color: var(--muted); font-size: 0.85rem; }
.stats .bad b { color: var(--bad); }

.chat-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 10px; }
.chat-card { display: block; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 12px; color: var(--text); }
.chat-card:hover { text-decoration: none; border-color: var(--accent); }
.chat-card .row { display: flex; justify-content: space-between; gap: 8px; }
.chat-card time { color: var(--muted); font-size: 0.8rem; white-space: nowrap; }
.chat-card .preview { color: var(--muted); font-size: 0.9rem; margin-top: 4px; overflow-wrap: anywhere; }
.chat-card .count { display: inline-block; margin-top: 6px; font-size: 0.75rem; color: var(--accent); }

.chat-list { list-style: none; padding: 0; margin: 12px 0; background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); }
.chat-list li { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 14px; border-bottom: 1px solid var(--line); }
.chat-list li:last-child { border-bottom: 0; }
.chat-list li.on { background: var(--me); }
.chat-list .who { display: grid; min-width: 0; }
.chat-list .who strong { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; color: var(--text); }
.chat-list form { margin: 0; flex: none; }

.chat-header { display: flex; justify-content: space-between; align-items: flex-start; gap: 12px; flex-wrap: wrap; }
.chat-header form { margin-top: 8px; }

/* messages */
.feed { display: grid; gap: 8px; }
.msg { background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius); padding: 10px 12px; max-width: 100%; }
.msg.me { background: var(--me); }
.msg.revoked { border-style: dashed; }
.msg-head { display: flex; gap: 8px; align-items: baseline; flex-wrap: wrap; font-size: 0.82rem; color: var(--muted); }
.msg-head .chat-name { font-weight: 700; }
.msg-head .who { color: var(--text); font-weight: 600; }
.msg-head time { margin-left: auto; }
.body { white-space: pre-wrap; overflow-wrap: anywhere; margin-top: 4px; }
.media { margin-top: 8px; }
.media img, .media video { display: block; max-width: min(100%, 360px); max-height: 360px; border-radius: 10px; background: var(--bg); }
.media img.dim { opacity: 0.6; }
.media audio { width: min(100%, 360px); }
.media .doc { display: inline-block; padding: 8px 12px; border: 1px solid var(--line); border-radius: 10px; }
.media-meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; margin-top: 6px; }
.small-link { font-size: 0.8rem; }

.qr { display: block; width: min(100%, 320px); background: #fff; padding: 8px; border-radius: 12px; }
.code { font: 700 2rem/1.2 ui-monospace, SFMono-Regular, Menlo, monospace; letter-spacing: 0.15em; margin: 8px 0; }

@media (max-width: 520px) {
  .top { flex-wrap: wrap; }
  .top nav { order: 3; flex-basis: 100%; }
  .media img, .media video { max-width: 100%; }
}