:root {
  font: 14px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
  color-scheme: light;
  --text: #25313c;
  --page: #edf0f3;
  --surface: #fff;
  --surface-muted: #f6f7f9;
  --bubble: #f0f2f5;
  --bubble-mine: #def3ec;
  --muted: #6c7886;
  --line: #e6e9ee;
  --accent: #137c66;
  --accent-hover: #0d6553;
  --on-accent: #fff;
  --soft: #e6f2ee;
  --danger: #b34237;
  --presence-offline: #aebbb3;
  --overlay: #18233066;
  --shadow: 0 16px 56px #18233018;
  --radius: 8px;
  --sidebar-width: 260px;
  --gutter: clamp(16px, 3vw, 40px);
  --app-height: 100dvh;
  color: var(--text);
  background: var(--page);
}
* { box-sizing: border-box; }
body { margin: 0; -webkit-font-smoothing: antialiased; }
button, input, textarea { font: inherit; }
button {
  cursor: pointer;
  color: inherit;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 7px 11px;
  transition: background .15s, border-color .15s, box-shadow .15s;
}
button:hover:not(:disabled) { background: var(--soft); }
button:disabled { cursor: default; opacity: .45; }
button svg { display: block; inline-size: 20px; block-size: 20px; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }
input, textarea {
  min-inline-size: 0;
  color: inherit;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 10px 12px;
}
input::placeholder, textarea::placeholder { color: var(--muted); opacity: 1; }
:where(button, input, textarea):focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
[hidden] { display: none !important; }
.app {
  display: grid;
  grid-template-columns: var(--sidebar-width) minmax(0, 1fr);
  block-size: var(--app-height);
  max-inline-size: 1600px;
  margin-inline: auto;
  background: var(--surface);
  box-shadow: var(--shadow);
}
.sidebar { min-block-size: 0; background: var(--surface-muted); border-inline-end: 1px solid var(--line); display: flex; flex-direction: column; }
.sidebar:focus { outline: none; }
.side-head { padding: 28px 24px 24px; display: grid; gap: 12px; }
.wordmark { display: block; inline-size: 120px; color: var(--text); }
.wordmark svg { display: block; inline-size: 100%; block-size: auto; overflow: visible; }
.wordmark-up { stroke: var(--accent); }
.identity-row span, .hint, #subtitle { color: var(--muted); font-size: 12px; }
.side-head span { overflow-wrap: anywhere; }
.identity-row { display: flex; align-items: center; gap: 7px; min-inline-size: 0; }
.search { position: relative; padding: 0 16px 20px; }
.search::before { content: ""; position: absolute; inset: 14px auto auto 30px; inline-size: 10px; block-size: 10px; border: 1.5px solid var(--muted); border-radius: 50%; pointer-events: none; }
.search::after { content: ""; position: absolute; inset: 25px auto auto 40px; inline-size: 5px; border-block-start: 1.5px solid var(--muted); transform: rotate(45deg); pointer-events: none; }
.search input { inline-size: 100%; block-size: 42px; padding-inline-start: 36px; font-size: 13px; }
nav { flex: 1; overflow: auto; padding: 0 12px 16px; scrollbar-width: thin; scrollbar-color: var(--line) transparent; }
h2 { font-size: 11px; color: var(--muted); font-weight: 600; margin: 18px 12px 6px; }
.contact { inline-size: 100%; text-align: start; display: grid; grid-template-columns: 8px minmax(0, 1fr) auto; gap: 0 6px; padding: 4px 8px; align-items: center; margin-block: 1px; min-block-size: 30px; border-radius: 6px; font-size: 12px; }
#general { display: block; font-weight: 600; inline-size: calc(100% - 16px); margin-inline: 8px; }
.contact.active { background: var(--soft); color: var(--accent); box-shadow: inset 3px 0 var(--accent); }
.contact-name, .contact small, h1 { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.contact small { grid-column: 2; color: var(--muted); }
#recent, #contacts { padding-inline: 8px; }
:is(#recent, #contacts) .contact small { display: none; }
:is(#recent, #contacts) .badge { grid-row: 1; }
.presence { inline-size: 7px; block-size: 7px; border-radius: 50%; background: var(--presence-offline); }
.is-online .presence { background: var(--accent); }
.badge { grid-column: 3; grid-row: 1 / 3; font-size: 11px; background: var(--accent); color: var(--on-accent); border-radius: 12px; min-inline-size: 18px; padding-inline: 4px; text-align: center; }
.badge:empty { display: none; }
.side-foot { padding: 12px 16px max(16px, env(safe-area-inset-bottom)); border-block-start: 1px solid var(--line); }
.side-actions { display: grid; gap: 2px; }
.side-foot button { font-size: 12px; text-align: start; min-block-size: 36px; }
#logout { color: var(--danger); }
.main { min-inline-size: 0; min-block-size: 0; display: flex; flex-direction: column; }
.top { min-block-size: 88px; display: flex; align-items: center; gap: 12px; padding: 16px var(--gutter); border-block-end: 1px solid var(--line); }
.heading { flex: 1; min-inline-size: 0; }
h1 { font-size: 18px; font-weight: 650; margin: 0 0 3px; }
.menu, .mobile-status { display: none; }
#callActions { display: flex; gap: 8px; }
#callActions button { border-color: var(--line); font-size: 12px; }
.connection { display: flex; align-items: center; flex-wrap: wrap; gap: 6px; padding: 4px 10px 8px; color: var(--muted); font-size: 12px; min-block-size: 34px; }
#status { display: inline-flex; flex-shrink: 0; }
#status::before { margin: 0; }
.connection-status::before { content: ""; display: inline-block; inline-size: 7px; block-size: 7px; margin-inline-end: 7px; border-radius: 50%; background: var(--danger); }
.connection-status[data-phase="connected"]::before { background: var(--accent); }
.connection-status:is([data-phase="connecting"], [data-phase="retry"])::before { background: var(--muted); }
.connection button { flex: none; padding: 3px 7px; }
.notice { margin: 0; padding: 10px var(--gutter); background: var(--soft); border-block-end: 1px solid var(--line); font-size: 12px; overflow-wrap: anywhere; }
.error, .message.failed .message-footer { color: var(--danger); }
.timeline { flex: 1; min-block-size: 0; position: relative; }
.messages { block-size: 100%; overflow: auto; padding: 12px var(--gutter); overflow-anchor: none; scrollbar-width: thin; scrollbar-color: var(--line) transparent; }
.empty { color: var(--muted); text-align: center; margin-block-start: 15vh; font-size: 13px; }
.date { display: flex; align-items: center; gap: 16px; font-size: 11px; color: var(--muted); margin-block: 4px 10px; }
.date::before, .date::after { content: ""; flex: 1; border-block-start: 1px solid var(--line); }
.message { inline-size: fit-content; max-inline-size: min(78%, 680px); margin-block: 8px 2px; margin-inline-end: auto; }
.message.mine { margin-inline-start: auto; margin-inline-end: 0; }
.message-meta { font-size: 11px; color: var(--muted); margin: 0 4px 2px; }
.mine .message-meta { text-align: end; }
.message-text { background: var(--bubble); border-radius: 12px; border-start-start-radius: 3px; padding: 6px 10px; margin: 0; line-height: 1.45; white-space: pre-wrap; overflow-wrap: anywhere; user-select: text; }
.mine .message-text { background: var(--bubble-mine); border-start-start-radius: 12px; border-start-end-radius: 3px; }
.message-footer { font-size: 10px; display: flex; align-items: center; gap: 6px; color: var(--muted); padding: 0 4px; }
.mine .message-footer { justify-content: flex-end; }
.message-footer button { padding: 0 4px; font-size: 10px; }
.grouped { margin-block-start: 2px; }
.grouped .message-meta { display: none; }
.new-messages { position: absolute; inset-block-end: 12px; inset-inline-start: 50%; transform: translateX(-50%); background: var(--surface); border-color: var(--line); box-shadow: var(--shadow); font-size: 12px; border-radius: 24px; }
.compose { padding: 10px 8px max(14px, env(safe-area-inset-bottom)); }
.compose-row { display: flex; gap: 6px; align-items: flex-end; inline-size: 100%; padding: 4px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); box-shadow: 0 3px 14px #18233006; }
.compose-row:focus-within { border-color: var(--accent); outline: 2px solid var(--soft); }
.compose textarea { resize: none; flex: 1; max-block-size: 144px; min-block-size: 36px; padding: 6px 10px; border: 0; background: transparent; }
.compose textarea:focus-visible { outline: none; }
.primary { background: var(--accent); color: var(--on-accent); padding: 10px 20px; }
.primary:hover:not(:disabled) { background: var(--accent-hover); }
#send { display: grid; place-items: center; flex: 0 0 36px; block-size: 36px; padding: 0; }
dialog { inline-size: min(400px, calc(100% - 32px)); max-block-size: calc(100dvh - 32px); overflow: auto; padding: 32px; border: 1px solid var(--line); border-radius: 8px; background: var(--surface); color: inherit; box-shadow: var(--shadow); }
dialog::backdrop, .backdrop { background: var(--overlay); }
dialog::backdrop { backdrop-filter: blur(4px); }
dialog h2 { font-size: 23px; font-weight: 650; color: inherit; margin: 0 0 28px; }
dialog label { display: grid; gap: 8px; margin-block-start: 18px; font-size: 12px; font-weight: 600; }
dialog input { inline-size: 100%; min-block-size: 46px; margin-block-start: 1px; font-size: 14px; font-weight: 400; background: var(--surface-muted); }
dialog .error { padding: 10px 0 0; font-size: 12px; }
.actions { display: flex; justify-content: flex-end; gap: 8px; margin-block-start: 28px; }
.actions button { min-block-size: 42px; }
.sr-only { position: absolute; inline-size: 1px; block-size: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.backdrop { position: fixed; inset: 0; border: 0; border-radius: 0; z-index: 2; }
.backdrop:hover { background: var(--overlay); }

@media (max-width: 720px) {
  input, textarea, .search input, dialog input { font-size: 16px; }
  .app { grid-template-columns: minmax(0, 1fr); }
  .sidebar { position: fixed; inset: 0 auto 0 0; inline-size: min(var(--sidebar-width), 88vw); z-index: 3; transform: translateX(-100%); transition: transform .15s; }
  .sidebar-open .sidebar { transform: translateX(0); }
  .menu { display: grid; place-items: center; flex: 0 0 40px; block-size: 40px; padding: 0; }
  .mobile-status { display: inline-flex; align-items: center; flex-shrink: 0; }
  .mobile-status::before { margin: 0; }
  .top { min-block-size: 60px; gap: 6px; padding: 8px 14px; }
  h1 { font-size: 15px; margin-block-end: 1px; }
  #subtitle { font-size: 11px; }
  .menu { flex-basis: 36px; block-size: 36px; }
  #callActions { gap: 2px; }
  #callActions button { padding: 6px; }
  .message { max-inline-size: 90%; }
  .compose { padding-block: 8px max(10px, env(safe-area-inset-bottom)); }
  dialog { padding: 26px; }
}
@media (prefers-reduced-motion: reduce) { button, .sidebar { transition: none; } }
@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --text: #e2e7ef;
    --page: #111317;
    --surface: #1b1e24;
    --surface-muted: #16191e;
    --bubble: #292e37;
    --bubble-mine: #24483f;
    --muted: #9ba6b6;
    --line: #30353f;
    --accent: #7bd9bc;
    --accent-hover: #a0e6d0;
    --on-accent: #13392e;
    --soft: #233b35;
    --danger: #ffaaa0;
    --presence-offline: #71867a;
    --overlay: #0009;
    --shadow: 0 12px 40px #0004;
  }
}