:root {
  color-scheme: dark;
  --bg: #0c0f14;
  --panel: #121826;
  --border: #243049;
  --text: #e8edf7;
  --muted: #9aa7c3;
  --accent: #7dd3fc;
  --user: #1d2b45;
  --bot: #152031;
  --danger: #f87171;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji",
    "Segoe UI Emoji";
}

* {
  box-sizing: border-box;
}

html {
  height: 100%;
}

body {
  margin: 0;
  height: 100%;
  min-height: 100dvh;
  background: radial-gradient(1200px 600px at 20% 0%, #13203a 0%, var(--bg) 55%);
  color: var(--text);
}

.shell {
  max-width: 840px;
  height: 100%;
  min-height: 100dvh;
  margin: 0 auto;
  padding: 20px 18px 18px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.hero {
  flex: none;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 14px;
}

.hero h1 {
  margin: 0 0 6px;
  font-size: 28px;
  letter-spacing: -0.02em;
}

.tag {
  margin: 0;
  color: var(--muted);
  line-height: 1.45;
  max-width: 52ch;
}

.badge {
  flex: none;
  padding: 8px 12px;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--panel) 90%, black);
  border-radius: 999px;
  color: var(--muted);
  font-size: 12px;
  white-space: nowrap;
}

.badge.ok {
  border-color: color-mix(in oklab, var(--accent) 40%, var(--border));
  color: color-mix(in oklab, var(--accent) 80%, white);
}

.chat {
  flex: 1 1 auto;
  min-height: 0;
  display: flex;
  flex-direction: column;
  border: 1px solid var(--border);
  background: color-mix(in oklab, var(--panel) 88%, black);
  border-radius: 14px;
  padding: 14px;
  overflow: hidden;
}

.transcript {
  flex: 1 1 auto;
  min-height: 0;
  overflow: auto;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-right: 4px;
  scrollbar-gutter: stable;
}

.transcript::-webkit-scrollbar {
  width: 8px;
}

.transcript::-webkit-scrollbar-thumb {
  background: color-mix(in oklab, var(--border) 80%, transparent);
  border-radius: 999px;
}

.bubble {
  max-width: 85%;
  padding: 12px 12px;
  border-radius: 14px;
  border: 1px solid color-mix(in oklab, var(--border) 75%, transparent);
  line-height: 1.45;
  white-space: pre-wrap;
}

.bubble.user {
  align-self: flex-end;
  background: var(--user);
}

.bubble.assistant {
  align-self: flex-start;
  background: var(--bot);
}

.composer {
  flex: none;
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 10px;
  align-items: end;
  padding-top: 2px;
  border-top: 1px solid color-mix(in oklab, var(--border) 55%, transparent);
}

textarea {
  width: 100%;
  resize: vertical;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: #0b1220;
  color: var(--text);
  padding: 12px 12px;
  outline: none;
}

textarea:focus {
  border-color: color-mix(in oklab, var(--accent) 45%, var(--border));
  box-shadow: 0 0 0 3px color-mix(in oklab, var(--accent) 25%, transparent);
}

button {
  border: 1px solid color-mix(in oklab, var(--accent) 40%, var(--border));
  background: linear-gradient(180deg, color-mix(in oklab, var(--accent) 22%, var(--panel)), var(--panel));
  color: var(--text);
  padding: 12px 16px;
  border-radius: 12px;
  cursor: pointer;
  font-weight: 600;
}

button:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.error {
  color: var(--danger);
  font-size: 13px;
  padding: 10px 12px;
  border: 1px solid color-mix(in oklab, var(--danger) 40%, var(--border));
  border-radius: 12px;
  background: color-mix(in oklab, var(--danger) 10%, var(--panel));
}