@font-face {
  font-family: 'Inter';
  src: url('fonts/Inter-Regular.woff2') format('woff2');
  font-weight: 400;
  font-style: normal;
  font-display: block;
}
@font-face {
  font-family: 'Inter';
  src: url('fonts/Inter-Medium.woff2') format('woff2');
  font-weight: 500;
  font-style: normal;
  font-display: block;
}
@font-face {
  font-family: 'Inter';
  src: url('fonts/Inter-SemiBold.woff2') format('woff2');
  font-weight: 600;
  font-style: normal;
  font-display: block;
}

:root {
  --ground: #F5F2ED;
  --sidebar: #2E2A26;
  --sidebar-hover: #3A342E;
  --header: #3A342E;
  --accent: #C4682B;
  --bubble-own: #E9DFD2;
  --bubble-them: #FFFFFF;
  --bubble-them-edge: #DED6CA;
  --ink: #2B2621;
  --ink-inverse: #F5F2ED;
  --muted: #8A8078;
  --muted-dark: #A79C91;
  --rule: #E2DACE;
  --demo: #D94F4F;

  --sidebar-w: 320px;
  --header-h: 60px;
  --avatar: 38px;
  --avatar-sm: 34px;
  --bubble-max: 560px;
  --convo-row-h: 76px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html, body {
  height: 100%;
  overflow: hidden; 
}

body {
  font-family: 'Inter', sans-serif;
  font-size: 14px;
  line-height: 1.45;
  color: var(--ink);
  background: var(--ground);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

.appbar {
  height: var(--header-h);
  background: var(--header);
  color: var(--ink-inverse);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex: 0 0 auto;
}

.brand { display: flex; align-items: center; gap: 11px; }

.brand .mark {
  width: 28px;
  height: 28px;
  border-radius: 7px;
  background: var(--accent);
  color: #fff;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 15px;
  flex: 0 0 auto;
}

.brand .name { font-size: 17px; font-weight: 600; letter-spacing: 0.2px; }

.demo-flag {
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1px;
  background: var(--demo);
  color: #fff;
  padding: 3px 9px;
  border-radius: 4px;
  font-weight: 600;
  margin-left: 4px;
}

.signed-in { font-size: 13px; color: var(--muted-dark); }
.signed-in strong { color: var(--ink-inverse); font-weight: 500; }

.shell {
  display: flex;
  height: calc(100% - var(--header-h));
}

.sidebar {
  width: var(--sidebar-w);
  flex: 0 0 var(--sidebar-w);
  background: var(--sidebar);
  color: var(--ink-inverse);
  overflow-y: auto;
}

.sidebar-head {
  padding: 16px 18px 10px;
  font-size: 11px;
  text-transform: uppercase;
  letter-spacing: 1.2px;
  color: var(--muted-dark);
  font-weight: 600;
}

.convo {
  height: var(--convo-row-h);
  padding: 0 18px;
  display: flex;
  align-items: center;
  gap: 12px;
  border-left: 3px solid transparent;
  cursor: default;
}

.convo.selected {
  background: var(--sidebar-hover);
  border-left-color: var(--accent);
}

.convo .avatar { flex: 0 0 var(--avatar-sm); width: var(--avatar-sm); height: var(--avatar-sm); font-size: 12px; }

.convo-text { min-width: 0; flex: 1 1 auto; }

.convo-top { display: flex; justify-content: space-between; align-items: baseline; gap: 8px; }
.convo-name { font-size: 14px; font-weight: 500; }
.convo-date { font-size: 11px; color: var(--muted-dark); flex: 0 0 auto; }

.convo-preview {
  font-size: 12.5px;
  color: var(--muted-dark);
  white-space: nowrap;
  overflow: hidden;
  margin-top: 2px;
}

.avatar {
  width: var(--avatar);
  height: var(--avatar);
  border-radius: 50%;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 600;
  color: #fff;
  flex: 0 0 auto;
  letter-spacing: 0.3px;
}

.main { flex: 1 1 auto; display: flex; flex-direction: column; min-width: 0; }

.thread-head {
  height: 64px;
  flex: 0 0 64px;
  border-bottom: 1px solid var(--rule);
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 24px;
  background: #FBF9F6;
}

.thread-head .who { font-size: 15px; font-weight: 600; }
.thread-head .sub { font-size: 12.5px; color: var(--muted); }

.thread {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 22px 24px 28px;
}

.daybreak {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 4px 0 18px;
  font-size: 11.5px;
  color: var(--muted);
  font-weight: 500;
}
.daybreak::before, .daybreak::after {
  content: '';
  flex: 1 1 auto;
  height: 1px;
  background: var(--rule);
}
.msg + .daybreak { margin-top: 22px; }

.msg { display: flex; gap: 11px; margin-bottom: 14px; align-items: flex-end; }
.msg.own { flex-direction: row-reverse; }

.bubble {
  max-width: var(--bubble-max);
  padding: 9px 13px 8px;
  border-radius: 12px;
  background: var(--bubble-them);
  border: 1px solid var(--bubble-them-edge);
}

.msg.own .bubble {
  background: var(--bubble-own);
  border-color: var(--bubble-own);
}

.bubble .body { font-size: 14px; white-space: pre-wrap; }

.bubble .meta {
  margin-top: 4px;
  font-size: 11px;
  color: var(--muted);
  font-variant-numeric: tabular-nums; 
}
.msg.own .bubble .meta { text-align: right; }

.composer {
  flex: 0 0 auto;
  border-top: 1px solid var(--rule);
  padding: 14px 24px;
  background: #FBF9F6;
}
.composer .field {
  height: 42px;
  border: 1px solid var(--rule);
  border-radius: 8px;
  background: #F2EEE8;
  color: var(--muted);
  display: flex;
  align-items: center;
  padding: 0 14px;
  font-size: 13.5px;
  user-select: none;
}

.error {
  margin: 40px auto;
  max-width: 520px;
  border: 1px solid var(--bubble-them-edge);
  border-left: 3px solid var(--demo);
  background: #fff;
  padding: 20px 22px;
  border-radius: 8px;
}
.error h2 { font-size: 15px; font-weight: 600; margin-bottom: 6px; }
.error p { font-size: 13.5px; color: var(--muted); }

*, *::before, *::after {
  animation: none !important;
  transition: none !important;
  scroll-behavior: auto !important;
}