:root {
  --bg: #F4F5F8;
  --surface: #FFFFFF;
  --surface-2: #ECEEF3;
  --ink: #171A23;
  --muted: #5D6475;
  --line: #DCE0E8;
  --accent: #3550D0;
  --on-accent: #FFFFFF;
  --side: #1C2130;
  --side-2: #262C3D;
  --side-ink: #E8EAF1;
  --side-muted: #9AA2B6;
  --mention: #FBEFC5;
  --mention-ink: #6B4E00;
  --self-mention: #FFE08A;
  --ok: #1D7F4A;
  --bad: #B8332A;
  --font-display: "Familjen Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-body: "IBM Plex Sans", "Segoe UI", Roboto, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, Menlo, monospace;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0F1218;
    --surface: #161A23;
    --surface-2: #1F2430;
    --ink: #E6E8EF;
    --muted: #9AA1B3;
    --line: #2A3040;
    --accent: #8FA4FF;
    --on-accent: #0F1218;
    --side: #0B0E14;
    --side-2: #181C27;
    --side-ink: #E6E8EF;
    --side-muted: #8C93A6;
    --mention: #3A3218;
    --mention-ink: #F4D67A;
    --self-mention: #5A4A12;
    --ok: #5BC78A;
    --bad: #F07A6E;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }
html, body { height: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 15px/1.5 var(--font-body); }
h1, h2 { font-family: var(--font-display); margin: 0; line-height: 1.15; }
p { margin: 0; }
a { color: var(--accent); }
code { font-family: var(--font-mono); font-size: 0.9em; }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.sr-only { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; }
.fine { color: var(--muted); font-size: 0.82rem; }
.row { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
form.inline { display: inline; margin: 0; }

.button { border: 1px solid var(--accent); background: var(--accent); color: var(--on-accent); border-radius: 8px; padding: 8px 16px;
  font: 600 0.9rem var(--font-body); cursor: pointer; }
.button.small { padding: 4px 10px; font-size: 0.82rem; }
.button:hover { filter: brightness(1.08); }
.link-button { background: none; border: 0; padding: 0; color: var(--accent); font: inherit; cursor: pointer; text-decoration: underline; }
.link-button.danger { color: var(--bad); }
input, textarea { font: inherit; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 8px; padding: 8px 10px; }
textarea { resize: vertical; }

.avatar { flex: none; width: 34px; height: 34px; border-radius: 9px; display: grid; place-items: center; font: 700 0.95rem var(--font-display); color: #FFFFFF; }
.avatar.small { width: 22px; height: 22px; border-radius: 6px; font-size: 0.72rem; }
.avatar.large { width: 52px; height: 52px; border-radius: 14px; font-size: 1.4rem; }
.av-0 { background: #3550D0; }
.av-1 { background: #1D7F6A; }
.av-2 { background: #B24A8B; }
.av-3 { background: #C2611B; }
.av-4 { background: #6A4FC9; }
.av-5 { background: #2C7FA8; }

/* Sign in */
.login-page { display: grid; place-items: center; padding: 32px max(16px, env(safe-area-inset-right, 0px)) 32px max(16px, env(safe-area-inset-left, 0px)); }
.login { max-width: 560px; display: grid; gap: 14px; }
.login h1 { font-size: 2.6rem; letter-spacing: -0.02em; }
.eyebrow { font: 500 0.75rem var(--font-mono); letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.lede { color: var(--muted); font-size: 1.05rem; }
.people { display: grid; grid-template-columns: repeat(auto-fit, minmax(150px, 1fr)); gap: 10px; margin-top: 6px; }
.person-button { width: 100%; display: grid; justify-items: center; gap: 10px; padding: 18px 12px; border-radius: 12px; border: 1px solid var(--line);
  background: var(--surface); color: var(--ink); font: 600 0.95rem var(--font-body); cursor: pointer; }
.person-button:hover { border-color: var(--accent); }

/* App frame */
.app { height: 100%; display: grid; grid-template-columns: 264px minmax(0, 1fr); }
.sidebar { background: var(--side); color: var(--side-ink); display: flex; flex-direction: column; min-height: 0; }
.brand-row { display: flex; align-items: center; justify-content: space-between; padding: 18px 18px 10px; }
.brand { font: 700 1.2rem var(--font-display); color: var(--side-ink); text-decoration: none; }
.live-dot { font: 500 0.7rem var(--font-mono); color: var(--side-muted); display: inline-flex; align-items: center; gap: 6px; }
.live-dot::before { content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--side-muted); }
.live-dot.on { color: #7FD8A4; }
.live-dot.on::before { background: #4CC27E; }
.nav { flex: 1; overflow-y: auto; padding: 4px 10px 12px; display: grid; align-content: start; gap: 4px; }
.nav-head { display: flex; justify-content: space-between; align-items: baseline; padding: 14px 8px 4px; font: 500 0.72rem var(--font-mono);
  letter-spacing: 0.07em; text-transform: uppercase; color: var(--side-muted); }
.nav-more { color: var(--side-muted); text-transform: none; letter-spacing: 0; font-family: var(--font-body); font-size: 0.8rem; }
.nav-list { list-style: none; margin: 0; padding: 0; display: grid; gap: 1px; }
.nav-form { margin: 0; }
.nav-item { width: 100%; display: flex; align-items: center; gap: 8px; padding: 6px 8px; border-radius: 7px; color: var(--side-ink); text-decoration: none;
  background: none; border: 0; font: 500 0.92rem var(--font-body); cursor: pointer; text-align: left; }
.nav-item:hover { background: var(--side-2); }
.nav-item[aria-current="page"] { background: var(--accent); color: var(--on-accent); }
.nav-name { flex: 1; min-width: 0; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.nav-empty { padding: 4px 8px; color: var(--side-muted); font-size: 0.85rem; }
.nav-empty a { color: var(--side-ink); }
.badge { min-width: 20px; padding: 0 6px; border-radius: 10px; background: #E5484D; color: #FFFFFF; font: 700 0.72rem/20px var(--font-body); text-align: center; }
.me { display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-top: 1px solid var(--side-2); }
.me-name { flex: 1; font-weight: 600; }
.me .link-button { color: var(--side-muted); font-size: 0.85rem; }

/* Conversation */
.chat { min-width: 0; min-height: 0; display: flex; flex-direction: column; background: var(--surface); }
.chat-head { display: flex; justify-content: space-between; gap: 12px; align-items: flex-start; padding: 16px 24px 12px; border-bottom: 1px solid var(--line); }
.chat-title { display: grid; gap: 2px; min-width: 0; }
.chat-title h1 { font-size: 1.35rem; }
.menu { position: relative; }
.menu summary { cursor: pointer; color: var(--muted); font-size: 0.88rem; list-style: none; padding: 4px 8px; border: 1px solid var(--line); border-radius: 7px; }
.menu-body { position: absolute; right: 0; top: calc(100% + 6px); z-index: 5; width: 280px; background: var(--surface); border: 1px solid var(--line);
  border-radius: 10px; padding: 14px; display: grid; gap: 12px; box-shadow: 0 8px 24px rgb(0 0 0 / 0.12); }
.stack-form { display: grid; gap: 6px; }
.stack-form label { font-weight: 600; font-size: 0.9rem; }
.stack-form input { flex: 1; min-width: 0; }
.notices { padding: 0 24px; }
.notice, .problem { margin-top: 12px; padding: 8px 12px; border-radius: 8px; font-size: 0.9rem; }
.notice { background: color-mix(in srgb, var(--ok) 12%, var(--surface)); color: var(--ok); }
.problem { background: color-mix(in srgb, var(--bad) 12%, var(--surface)); color: var(--bad); }

.timeline { flex: 1; overflow-y: auto; list-style: none; margin: 0; padding: 12px 0 8px; }
.timeline-empty { padding: 24px; color: var(--muted); }
.msg { display: flex; gap: 12px; padding: 6px 24px; }
.msg:hover { background: var(--bg); }
.msg.arrived { animation: arrive 1.4s ease-out; }
@keyframes arrive { from { background: color-mix(in srgb, var(--accent) 16%, var(--surface)); } to { background: transparent; } }
.msg-body { min-width: 0; flex: 1; display: grid; gap: 2px; }
.msg-head { display: flex; gap: 8px; align-items: baseline; }
.msg-author { font-weight: 600; }
.msg-time { color: var(--muted); font-size: 0.78rem; text-decoration: none; }
.msg-time:hover { text-decoration: underline; }
.msg-edited { color: var(--muted); font-size: 0.75rem; }
.msg-text { overflow-wrap: anywhere; }
.msg-text.gone { color: var(--muted); font-style: italic; }
.mention { background: var(--mention); color: var(--mention-ink); border-radius: 4px; padding: 0 3px; font-weight: 600; }
.mention.self { background: var(--self-mention); }
.msg-actions summary { color: var(--muted); font-size: 0.78rem; cursor: pointer; width: max-content; }
.edit-form { display: grid; gap: 6px; margin: 6px 0; max-width: 560px; }

.composer { display: flex; gap: 10px; align-items: flex-end; padding: 12px 24px 18px; border-top: 1px solid var(--line); }
.composer textarea { flex: 1; min-width: 0; max-height: 200px; resize: none; }
.composer-off { display: flex; gap: 12px; align-items: center; justify-content: space-between; padding: 14px 24px; border-top: 1px solid var(--line);
  color: var(--muted); background: var(--bg); }

/* Pages */
.page .page-body { padding: 16px 24px 32px; display: grid; gap: 24px; max-width: 760px; overflow-y: auto; }
.channel-list, .mention-list, .history { list-style: none; margin: 0; padding: 0; display: grid; gap: 8px; }
.channel-row { display: flex; gap: 12px; align-items: center; padding: 10px 14px; border: 1px solid var(--line); border-radius: 10px; }
.channel-name { flex: 1; font-weight: 600; text-decoration: none; }
.pill { font-size: 0.75rem; font-weight: 600; color: var(--ok); border: 1px solid color-mix(in srgb, var(--ok) 50%, transparent); border-radius: 999px; padding: 1px 9px; }
.create-channel { border-top: 1px solid var(--line); padding-top: 20px; }
.mention-row, .history-row { padding: 12px 14px; border: 1px solid var(--line); border-radius: 10px; display: grid; gap: 4px; }
.history-row { border-left: 4px solid var(--accent); }
.history-row.e-deleted { border-left-color: var(--bad); }
.history-row.e-edited { border-left-color: #C2611B; }
.history-head { display: flex; gap: 10px; align-items: baseline; flex-wrap: wrap; }
.history-version { font: 500 0.8rem var(--font-mono); color: var(--muted); }
.code { margin: 0; background: var(--bg); border: 1px solid var(--line); border-radius: 8px; padding: 10px; overflow-x: auto; font: 0.8rem/1.5 var(--font-mono); }
.explain { background: var(--bg); border-radius: 10px; padding: 12px 14px; color: var(--muted); font-size: 0.9rem; }

@media (max-width: 760px) {
  .app { grid-template-columns: minmax(0, 1fr); grid-template-rows: auto minmax(0, 1fr); }
  .sidebar { max-height: 38vh; }
  .chat-head, .msg, .composer, .composer-off, .notices, .page .page-body { padding-left: max(16px, env(safe-area-inset-left, 0px)); padding-right: max(16px, env(safe-area-inset-right, 0px)); }
}
@media (prefers-reduced-motion: reduce) { .msg.arrived { animation: none; } }
.timeline.static { flex: none; overflow: visible; padding: 0; border: 1px solid var(--line); border-radius: 10px; }

/* Markdown in messages */
.msg-text p { margin: 0; }
.msg-text p + p, .msg-text ul, .msg-text ol, .msg-text pre, .msg-text blockquote { margin: 4px 0 0; }
.msg-text ul, .msg-text ol { padding-left: 22px; }
.msg-text code { background: var(--surface-2); border-radius: 4px; padding: 1px 4px; }
.msg-text pre { background: var(--surface-2); border-radius: 8px; padding: 8px 10px; overflow-x: auto; }
.msg-text pre code { background: none; padding: 0; }
.msg-text blockquote { border-left: 3px solid var(--line); padding-left: 10px; color: var(--muted); }
.composer-hint { padding: 0 24px 10px; margin-top: -10px; }