:root {
  --bg: #f4efe4;
  --bg-alt: #e7dcc2;
  --ink: #1f2a2a;
  --ink-soft: #455353;
  --card: rgba(255, 252, 245, 0.85);
  --card-strong: #fff9ec;
  --line: rgba(31, 42, 42, 0.16);
  --accent: #0f766e;
  --accent-2: #b45309;
  --danger: #b42318;
  --shadow: 0 20px 40px rgba(14, 35, 33, 0.12);
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  min-height: 100%;
}

body {
  font-family: "Space Grotesk", "Avenir Next", "Segoe UI", sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at 15% 15%, #fff8e6 0, transparent 38%),
    radial-gradient(circle at 90% 25%, #f5d4b4 0, transparent 31%),
    linear-gradient(145deg, var(--bg) 0%, var(--bg-alt) 100%);
}

.app-bg {
  position: fixed;
  inset: 0;
  background-image: linear-gradient(to right, rgba(0, 0, 0, 0.03) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 0, 0, 0.03) 1px, transparent 1px);
  background-size: 22px 22px;
  mask-image: radial-gradient(circle at 50% 50%, rgba(0, 0, 0, 0.7), transparent 85%);
  pointer-events: none;
}

.layout {
  position: relative;
  max-width: 1200px;
  margin: 0 auto;
  padding: 32px 18px 24px;
}

.hero {
  margin-bottom: 20px;
  animation: reveal-down 380ms ease-out both;
}

.eyebrow {
  margin: 0;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--ink-soft);
}

.hero h1 {
  margin: 8px 0 10px;
  font-family: "IBM Plex Serif", "Georgia", serif;
  font-size: clamp(1.7rem, 3.4vw, 2.8rem);
  line-height: 1.15;
  max-width: 16ch;
}

.hero-copy {
  margin: 0;
  max-width: 58ch;
  color: var(--ink-soft);
}

.chat-shell {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(250px, 300px) minmax(0, 1fr);
}

.sidebar,
.conversation {
  min-height: 74vh;
}

.sidebar {
  display: grid;
  gap: 12px;
  align-content: start;
}

.panel {
  padding: 14px;
  border: 1px solid var(--line);
  border-radius: 14px;
  background: var(--card);
  box-shadow: var(--shadow);
  backdrop-filter: blur(6px);
}

.panel h2 {
  margin: 0 0 8px;
  font-size: 0.96rem;
}

.muted {
  margin: 0 0 12px;
  color: var(--ink-soft);
  font-size: 0.9rem;
}

label {
  display: block;
  margin: 10px 0 6px;
  font-size: 0.82rem;
  color: var(--ink-soft);
}

input,
select,
textarea,
button {
  font: inherit;
}

input,
select,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: #fffcf3;
  color: var(--ink);
  padding: 9px 10px;
}

textarea {
  resize: vertical;
}

.prompt-list {
  display: grid;
  gap: 8px;
}

.prompt-chip {
  text-align: left;
  border: 1px solid color-mix(in hsl, var(--accent) 40%, white);
  background: linear-gradient(125deg, #e7fcf4, #f4fffb);
  border-radius: 999px;
  color: #0f3c38;
  padding: 9px 11px;
  cursor: pointer;
  transition: transform 120ms ease, box-shadow 120ms ease;
}

.prompt-chip:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px rgba(15, 118, 110, 0.16);
}

.telemetry ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.telemetry li {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  font-size: 0.92rem;
}

.telemetry strong {
  color: var(--accent);
}

.conversation {
  border: 1px solid var(--line);
  border-radius: 16px;
  background: var(--card-strong);
  box-shadow: var(--shadow);
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  overflow: hidden;
}

.messages {
  overflow: auto;
  padding: 16px;
  display: grid;
  align-content: start;
  gap: 12px;
}

.message {
  border-radius: 14px;
  border: 1px solid var(--line);
  padding: 12px;
  max-width: 84ch;
  animation: reveal-up 240ms ease-out both;
}

.message.user {
  margin-left: auto;
  background: #daf4ef;
  border-color: rgba(15, 118, 110, 0.25);
}

.message.assistant {
  background: #fff;
}

.message.system {
  background: #fff5ed;
  border-color: rgba(180, 83, 9, 0.2);
}

.role {
  display: block;
  margin-bottom: 6px;
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--ink-soft);
}

.answer {
  line-height: 1.48;
  white-space: pre-wrap;
}

.citations {
  margin-top: 10px;
  border-top: 1px dashed var(--line);
  padding-top: 8px;
}

.citations summary {
  cursor: pointer;
  color: var(--accent);
  font-weight: 600;
}

.citations ol {
  margin: 8px 0 0 18px;
  padding: 0;
}

.citations li {
  margin-bottom: 6px;
}

.citations a {
  color: var(--accent);
}

.feedback-controls {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  display: flex;
  gap: 8px;
  align-items: center;
}

.feedback-prompt {
  font-size: 0.84rem;
  color: var(--ink-soft);
  margin-right: 4px;
}

.feedback-btn {
  background: none;
  border: 1px solid var(--line);
  padding: 6px 12px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.84rem;
  color: var(--ink);
  transition: all 200ms ease-out;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  white-space: nowrap;
}

.feedback-btn:hover:not(.selected) {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(15, 118, 110, 0.05);
}

.feedback-btn.selected {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}

.feedback-btn.selected.unhelpful {
  background: var(--danger);
  border-color: var(--danger);
}

.feedback-status {
  font-size: 0.76rem;
  color: var(--ink-soft);
  margin-left: 4px;
}
  border-top: 1px solid var(--line);
  padding: 12px;
  background: rgba(255, 252, 246, 0.93);
}

.composer-row {
  margin-top: 10px;
  display: flex;
  justify-content: space-between;
  gap: 10px;
  align-items: center;
}

.hint {
  margin: 0;
  color: var(--ink-soft);
  font-size: 0.84rem;
}

button[type="submit"] {
  border: 0;
  border-radius: 10px;
  padding: 10px 14px;
  background: linear-gradient(130deg, var(--accent), #115e59);
  color: white;
  font-weight: 600;
  cursor: pointer;
}

button[disabled] {
  opacity: 0.65;
  cursor: wait;
}

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

.error-text {
  color: var(--danger);
}

@keyframes reveal-down {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes reveal-up {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 980px) {
  .chat-shell {
    grid-template-columns: 1fr;
  }

  .sidebar,
  .conversation {
    min-height: auto;
  }

  .sidebar {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .panel.telemetry {
    grid-column: 1 / -1;
  }
}

@media (max-width: 720px) {
  .layout {
    padding: 20px 12px;
  }

  .sidebar {
    grid-template-columns: 1fr;
  }

  .message {
    max-width: 100%;
  }
}