:root {
  --bg: #121820;
  --panel: #1a2332;
  --line: #2a3648;
  --text: #e8eef6;
  --muted: #8b9bb0;
  --accent: #3d9cf0;
  --user: #243447;
  --assistant: #1e2a38;
  --danger: #e35d5d;
  --safe: env(safe-area-inset-bottom, 0px);
}

* { box-sizing: border-box; }
html, body {
  margin: 0;
  height: 100%;
  background: radial-gradient(1200px 600px at 10% -10%, #1e3a5f 0%, transparent 55%),
              radial-gradient(900px 500px at 100% 0%, #2a1f3d 0%, transparent 50%),
              var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, sans-serif;
}
#app { height: 100%; }
.screen { min-height: 100%; }
.hidden { display: none !important; }
.muted { color: var(--muted); font-size: 12px; }
.error { color: var(--danger); }

#login {
  display: grid;
  place-content: center;
  gap: 12px;
  padding: 24px;
  text-align: center;
}
#login h1 { margin: 0; font-size: 32px; letter-spacing: 0.02em; }
#login .sub { margin: 0 0 12px; color: var(--muted); }
#login form {
  display: grid;
  gap: 10px;
  width: min(360px, 100%);
  margin: 0 auto;
}
input, textarea, select, button {
  font: inherit;
  border-radius: 12px;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  padding: 12px 14px;
}
button {
  background: var(--accent);
  border-color: transparent;
  color: #061018;
  font-weight: 650;
  cursor: pointer;
}
button:disabled { opacity: 0.5; }

#main {
  height: 100%;
  display: grid;
  grid-template-rows: auto 1fr auto;
}
.top {
  display: grid;
  grid-template-columns: 44px 1fr 44px;
  gap: 8px;
  align-items: center;
  padding: 10px 12px;
  background: color-mix(in srgb, var(--panel) 88%, transparent);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(10px);
}
.top button {
  width: 44px;
  height: 44px;
  padding: 0;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}
.top-title { min-width: 0; }
.top-title strong, .top-title span {
  display: block;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.thread {
  overflow: auto;
  padding: 16px 14px 24px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.bubble {
  max-width: 92%;
  padding: 12px 14px;
  border-radius: 16px;
  white-space: pre-wrap;
  word-break: break-word;
  line-height: 1.45;
  border: 1px solid var(--line);
}
.bubble.user {
  align-self: flex-end;
  background: var(--user);
}
.bubble.assistant {
  align-self: flex-start;
  background: var(--assistant);
}
.bubble.system {
  align-self: center;
  background: transparent;
  color: var(--muted);
  border: none;
  font-size: 13px;
}

.composer {
  display: grid;
  grid-template-columns: 1fr 48px;
  gap: 8px;
  padding: 10px 12px calc(10px + var(--safe));
  border-top: 1px solid var(--line);
  background: color-mix(in srgb, var(--panel) 92%, transparent);
}
.composer textarea {
  resize: none;
  min-height: 48px;
  max-height: 140px;
}
.composer button {
  width: 48px;
  height: 48px;
  padding: 0;
}

.drawer {
  position: fixed;
  inset: 0 auto 0 0;
  width: min(320px, 88vw);
  background: var(--panel);
  border-right: 1px solid var(--line);
  transform: translateX(-105%);
  transition: transform .2s ease;
  z-index: 20;
  display: grid;
  grid-template-rows: auto auto 1fr auto;
  padding: 12px;
  gap: 8px;
}
.drawer.open { transform: translateX(0); }
.drawer-head, .drawer-actions, .drawer-foot {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 8px;
}
.drawer button {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}
.list { overflow: auto; display: grid; gap: 6px; align-content: start; }
.list button.item {
  text-align: left;
  width: 100%;
  background: #152031;
}
.list button.item.active { outline: 1px solid var(--accent); }
.list .group-label {
  color: var(--muted);
  font-size: 12px;
  margin-top: 8px;
}
.scrim {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.45);
  z-index: 15;
}

dialog {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--panel);
  color: var(--text);
  width: min(420px, 92vw);
  padding: 16px;
}
dialog::backdrop { background: rgba(0,0,0,.55); }
dialog form { display: grid; gap: 12px; }
dialog label { display: grid; gap: 6px; font-size: 14px; color: var(--muted); }
.dialog-actions { display: flex; justify-content: flex-end; gap: 8px; }
.dialog-actions button[value="cancel"] {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--line);
}