:root {
  color-scheme: light dark;
  --bg: #f6f5f1;
  --surface: #fffefa;
  --ink: #252b29;
  --muted: #626b66;
  --line: #daddd5;
  --accent: #176a5b;
  --accent-soft: #e6f0e9;
  --on-accent: #ffffff;
  --warning: #775019;
  --warning-bg: #fbf0d9;
  --danger: #a33333;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #191d1b; --surface: #222724; --ink: #eeeee6; --muted: #adb6ae;
    --line: #3b443e; --accent: #8bd6bd; --accent-soft: #263f34; --on-accent: #10251e;
    --warning: #edc98b; --warning-bg: #373023; --danger: #f2aaa0;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 16px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
button, input, textarea, select { font: inherit; color: inherit; }
button { cursor: pointer; }
button, input, textarea, select { min-height: 44px; }
button { border: 1px solid var(--line); border-radius: 10px; background: var(--surface); padding: 9px 14px; touch-action: manipulation; }
button:disabled { opacity: .55; cursor: not-allowed; }
:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }
button:hover:not(:disabled) { background: var(--accent-soft); }
h1, h2, p { margin: 0; }
h1 { font-size: 29px; line-height: 1.25; letter-spacing: -.5px; }
h2 { font-size: 20px; line-height: 1.4; }
.app { max-width: 760px; min-height: 100vh; min-height: 100dvh; margin: auto; padding: max(16px, env(safe-area-inset-top)) max(20px, env(safe-area-inset-right)) max(20px, env(safe-area-inset-bottom)) max(20px, env(safe-area-inset-left)); }
.app-header { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 6px 0 16px; border-bottom: 1px solid var(--line); }
.brand { font-size: 22px; font-weight: 700; letter-spacing: -.7px; }
.brand-dot { color: var(--accent); margin-left: 3px; }
.edition { margin-left: 10px; color: var(--muted); font-size: 13px; }
.profile { color: var(--muted); font-size: 13px; overflow-wrap: anywhere; max-width: 45%; }
.connection { color: var(--muted); font-size: 12px; padding: 11px 0 18px; }
.connection.stale { color: var(--warning); }
.section-heading { display: flex; align-items: center; justify-content: space-between; gap: 12px; }
.eyebrow { color: var(--accent); font-size: 12px; margin-bottom: 7px; letter-spacing: 1px; }
.muted, .intro { color: var(--muted); }
.intro { font-size: 14px; margin: 12px 0 22px; }
.search-label { display: block; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
#session-search { display: block; width: 100%; border: 1px solid var(--line); background: var(--surface); border-radius: 10px; padding: 10px 12px; margin-bottom: 20px; }
.session-list { border-top: 1px solid var(--line); }
.session-row { width: 100%; display: block; text-align: left; padding: 18px 0; border: 0; border-bottom: 1px solid var(--line); border-radius: 0; background: transparent; }
.session-heading { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; }
.session-title { font-weight: 600; overflow-wrap: anywhere; min-width: 0; }
.state-pill { color: var(--accent); font-size: 12px; white-space: nowrap; }
.session-preview { display: block; color: var(--muted); font-size: 14px; margin-top: 5px; overflow: hidden; white-space: nowrap; text-overflow: ellipsis; }
.footnote { color: var(--muted); font-size: 12px; padding-top: 22px; }
.logout-button { margin-top: 14px; background: transparent; color: var(--muted); font-size: 13px; }
.empty { padding: 30px 0; color: var(--muted); font-size: 14px; }
.auth-view { padding: 26px 0; }
.auth-view p { color: var(--muted); margin-top: 14px; }
.auth-view .eyebrow { margin: 0 0 12px; color: var(--accent); }
.auth-retry { margin-top: 20px; }
.pair-code { display: block; font-family: ui-monospace, "SFMono-Regular", Consolas, monospace; font-size: 34px; letter-spacing: 6px; font-weight: 600; margin-top: 12px; padding: 16px 20px; background: var(--surface); border: 1px solid var(--line); border-radius: 12px; width: fit-content; max-width: 100%; overflow-wrap: anywhere; }
.detail-toolbar { display: flex; justify-content: space-between; gap: 12px; margin-bottom: 18px; }
.detail-heading { margin-bottom: 22px; }
.detail-heading h1 { font-size: 24px; overflow-wrap: anywhere; }
.detail-heading p { margin-top: 7px; font-size: 13px; }
.notice { border-radius: 10px; padding: 12px 14px; background: var(--warning-bg); color: var(--warning); font-size: 14px; margin-bottom: 18px; overflow-wrap: anywhere; }
.message { padding: 18px 0; }
.message-user { padding: 14px 16px; border-radius: 12px; background: var(--surface); border: 1px solid var(--line); margin: 12px 0; }
.message-author { color: var(--muted); font-size: 12px; font-weight: 600; margin-bottom: 8px; }
.message-text { white-space: pre-wrap; overflow-wrap: anywhere; }
.progress { margin-top: 16px; padding-top: 16px; border-top: 1px solid var(--line); }
.activity { color: var(--accent); font-size: 13px; margin-bottom: 8px; white-space: pre-wrap; overflow-wrap: anywhere; }
.progress-label { color: var(--muted); font-size: 12px; font-weight: 600; margin: 12px 0; }
.composer { margin-top: 24px; border-top: 1px solid var(--line); padding-top: 18px; padding-bottom: env(safe-area-inset-bottom); }
.composer-label { display: block; font-size: 14px; font-weight: 600; margin-bottom: 8px; }
textarea { display: block; width: 100%; resize: vertical; min-height: 100px; max-height: 40vh; border: 1px solid var(--line); border-radius: 12px; padding: 12px; background: var(--surface); }
.composer-actions { display: flex; align-items: center; justify-content: space-between; gap: 12px; margin-top: 10px; }
select { background: var(--surface); border: 1px solid var(--line); border-radius: 10px; padding: 8px 12px; max-width: 65%; }
.primary { border-color: var(--accent); background: var(--accent); color: var(--on-accent); font-weight: 600; padding: 9px 24px; }
.primary:hover:not(:disabled) { background: var(--accent); filter: brightness(.92); }
.helper { color: var(--muted); font-size: 12px; margin-top: 10px; }
#send-status:not(:empty) { color: var(--accent); font-size: 14px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; }