* {
  box-sizing: border-box;
}

:root {
  --bg: #f6efe2;
  --surface: #ffffff;
  --surface-2: #f1ece2;
  --border: #e6dccb;
  --text: #1f1d1a;
  --muted: #837b6e;
  --user-bg: #2b2723;
  --user-fg: #faf6ef;
  --accent: #b85c3e;
  --accent-hover: #a44e34;
  --error-bg: #fff5f1;
  --error-border: #ecc9c0;
  --error-fg: #903820;
  --radius: 14px;
  --radius-sm: 10px;
}

html,
body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

#app {
  max-width: 780px;
  margin: 0 auto;
  height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 0 20px;
}

/* Header */
header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 0 14px;
  border-bottom: 1px solid var(--border);
}

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

.brand .dot {
  width: 10px;
  height: 10px;
  border-radius: 999px;
  background: var(--accent);
  box-shadow: 0 0 0 4px rgba(184, 92, 62, 0.15);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-title {
  font-family: "Iowan Old Style", "Charter", "Georgia", serif;
  font-size: 1.1rem;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--muted);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

button.ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  font: inherit;
  font-size: 0.85rem;
  padding: 6px 13px;
  border-radius: 999px;
  cursor: pointer;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}

button.ghost:hover {
  background: var(--surface);
  border-color: var(--muted);
}

/* Conversation area */
#conversation {
  flex: 1;
  overflow-y: auto;
  padding: 20px 4px;
  display: flex;
  flex-direction: column;
  scroll-behavior: smooth;
}

#messages {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

/* Empty state */
.empty-state {
  margin: auto 0;
  padding: 24px 4px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.empty-state.hidden {
  display: none;
}

.empty-state h2 {
  font-family: "Iowan Old Style", "Charter", "Georgia", serif;
  margin: 0;
  font-size: 1.75rem;
  font-weight: 600;
  letter-spacing: -0.01em;
}

.empty-state p {
  margin: 0;
  color: var(--muted);
  max-width: 58ch;
  line-height: 1.55;
}

.empty-state a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 92, 62, 0.35);
  transition: border-color 0.15s;
}

.empty-state a:hover {
  border-bottom-color: var(--accent);
}

.chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 6px;
}

.chip {
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font: inherit;
  font-size: 0.9rem;
  padding: 8px 14px;
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, transform 0.06s, background 0.15s;
}

.chip:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.chip:active {
  transform: translateY(1px);
}

/* Bubbles */
.bubble {
  max-width: 86%;
  padding: 11px 15px;
  border-radius: var(--radius);
  line-height: 1.55;
  animation: fadeUp 0.18s ease-out;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.bubble.user {
  align-self: flex-end;
  background: var(--user-bg);
  color: var(--user-fg);
  white-space: pre-wrap;
  border-bottom-right-radius: 4px;
}

.bubble.assistant {
  align-self: flex-start;
  background: var(--surface);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.bubble.assistant > *:first-child {
  margin-top: 0;
}
.bubble.assistant > *:last-child {
  margin-bottom: 0;
}

.bubble.assistant h1,
.bubble.assistant h2,
.bubble.assistant h3 {
  font-family: "Iowan Old Style", "Charter", "Georgia", serif;
  margin: 14px 0 6px;
  font-weight: 600;
  line-height: 1.25;
}

.bubble.assistant h1 {
  font-size: 1.2rem;
}
.bubble.assistant h2 {
  font-size: 1.1rem;
}
.bubble.assistant h3 {
  font-size: 1rem;
}

.bubble.assistant p {
  margin: 8px 0;
}

.bubble.assistant ul,
.bubble.assistant ol {
  margin: 6px 0;
  padding-left: 22px;
}

.bubble.assistant li {
  margin: 3px 0;
}

.bubble.assistant a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 92, 62, 0.3);
}

.bubble.assistant a:hover {
  border-bottom-color: var(--accent);
}

.bubble.assistant code {
  background: var(--surface-2);
  padding: 1px 6px;
  border-radius: 4px;
  font-size: 0.92em;
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
}

.bubble.assistant pre {
  background: var(--surface-2);
  padding: 10px 12px;
  border-radius: 8px;
  overflow-x: auto;
  font-size: 0.92em;
}

.bubble.assistant pre code {
  background: transparent;
  padding: 0;
}

.bubble.assistant blockquote {
  margin: 8px 0;
  padding: 4px 12px;
  border-left: 3px solid var(--accent);
  color: var(--muted);
}

.bubble.error {
  align-self: flex-start;
  background: var(--error-bg);
  border: 1px solid var(--error-border);
  color: var(--error-fg);
}

/* Typing indicator */
.typing {
  display: inline-flex;
  gap: 5px;
  align-items: center;
  padding: 2px 0;
}

.typing span {
  width: 7px;
  height: 7px;
  border-radius: 999px;
  background: var(--muted);
  animation: bounce 1.2s infinite ease-in-out;
}

.typing span:nth-child(2) {
  animation-delay: 0.15s;
}
.typing span:nth-child(3) {
  animation-delay: 0.3s;
}

@keyframes bounce {
  0%,
  60%,
  100% {
    transform: translateY(0);
    opacity: 0.35;
  }
  30% {
    transform: translateY(-4px);
    opacity: 1;
  }
}

/* Composer */
#composer {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 8px 8px 8px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  margin-top: 10px;
  transition: border-color 0.15s, box-shadow 0.15s;
}

#composer:focus-within {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(184, 92, 62, 0.12);
}

#input {
  flex: 1;
  resize: none;
  padding: 8px 4px;
  font: inherit;
  border: none;
  background: transparent;
  outline: none;
  max-height: 200px;
  min-height: 24px;
  line-height: 1.45;
  color: var(--text);
  overflow-y: auto;
}

#input::placeholder {
  color: var(--muted);
}

#send {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 999px;
  background: var(--accent);
  color: var(--user-fg);
  cursor: pointer;
  flex-shrink: 0;
  transition: background 0.15s, transform 0.05s;
}

#send:hover:not(:disabled) {
  background: var(--accent-hover);
}

#send:active:not(:disabled) {
  transform: translateY(1px);
}

#send:disabled {
  background: var(--border);
  color: var(--muted);
  cursor: not-allowed;
}

.hint {
  margin: 8px 4px 14px;
  font-size: 0.75rem;
  color: var(--muted);
  text-align: center;
}

.hint kbd {
  font-family: inherit;
  font-size: 0.72rem;
  padding: 1px 6px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 4px;
  color: var(--text);
}

/* Scrollbar polish */
#conversation::-webkit-scrollbar,
#input::-webkit-scrollbar {
  width: 8px;
}

#conversation::-webkit-scrollbar-thumb,
#input::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 999px;
}

#conversation::-webkit-scrollbar-thumb:hover,
#input::-webkit-scrollbar-thumb:hover {
  background: var(--muted);
}

@media (max-width: 600px) {
  #app {
    padding: 0 12px;
  }
  .bubble {
    max-width: 92%;
  }
  .empty-state h2 {
    font-size: 1.4rem;
  }
  .hint {
    display: none;
  }
  .brand-sub {
    display: none;
  }
}