:root {
  color-scheme: light;
  --ink: #15201b;
  --muted: #65736c;
  --paper: #f4f0e6;
  --panel: rgba(255, 252, 244, 0.88);
  --line: rgba(21, 32, 27, 0.16);
  --accent: #0f6b4f;
  --accent-ink: #ffffff;
  --warn: #9b4a13;
  --shadow: 0 24px 80px rgba(28, 39, 33, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  font-family: "Avenir Next", "Gill Sans", "Trebuchet MS", sans-serif;
  background:
    radial-gradient(circle at 14% 12%, rgba(15, 107, 79, 0.22), transparent 30rem),
    radial-gradient(circle at 84% 18%, rgba(214, 139, 54, 0.22), transparent 28rem),
    linear-gradient(145deg, #e9e0cd 0%, #f8f4ea 46%, #dfe8de 100%);
}

button,
textarea {
  font: inherit;
}

.shell {
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  width: min(1120px, calc(100vw - 32px));
  min-height: calc(100vh - 32px);
  margin: 16px auto;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--panel);
  box-shadow: var(--shadow);
  backdrop-filter: blur(18px);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 26px 30px 20px;
  border-bottom: 1px solid var(--line);
}

h1 {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2rem, 4vw, 3.8rem);
  line-height: 0.95;
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 18px;
  overflow-y: auto;
  padding: 28px 30px;
}

.message {
  display: flex;
}

.message.user {
  justify-content: flex-end;
}

.bubble {
  width: min(760px, 100%);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 16px 18px;
  background: rgba(255, 255, 255, 0.72);
  white-space: pre-wrap;
  overflow-wrap: anywhere;
}

.message.user .bubble {
  border-color: var(--line);
  color: var(--ink);
  background: rgba(255, 255, 255, 0.88);
}

.markdown-body {
  white-space: normal;
}

.markdown-body > *:first-child {
  margin-top: 0;
}

.markdown-body > *:last-child {
  margin-bottom: 0;
}

.markdown-body h1,
.markdown-body h2,
.markdown-body h3,
.markdown-body h4 {
  margin: 1em 0 0.45em;
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.2;
}

.markdown-body p {
  margin: 0.65em 0;
  line-height: 1.68;
}

.markdown-body ul,
.markdown-body ol {
  margin: 0.65em 0;
  padding-left: 1.35em;
}

.markdown-body li {
  margin: 0.35em 0;
  line-height: 1.62;
}

.markdown-body blockquote {
  margin: 0.75em 0;
  border-left: 3px solid rgba(15, 107, 79, 0.28);
  padding: 0.05em 0 0.05em 0.85em;
  color: var(--muted);
}

.markdown-body hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 1em 0;
}

.markdown-body a {
  color: #0f6b4f;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

.markdown-body code {
  border: 1px solid rgba(21, 32, 27, 0.12);
  border-radius: 6px;
  padding: 0.08em 0.35em;
  color: #0d503c;
  background: rgba(15, 107, 79, 0.08);
  font-family: "SFMono-Regular", Consolas, "Liberation Mono", monospace;
  font-size: 0.92em;
}

.markdown-body pre {
  overflow-x: auto;
  margin: 0.85em 0;
  border-radius: 12px;
  padding: 12px;
  color: #f7f4eb;
  background: #1d2a24;
  white-space: pre;
}

.markdown-body pre code {
  border: 0;
  padding: 0;
  color: inherit;
  background: transparent;
}

.markdown-body table {
  width: 100%;
  margin: 0.9em 0;
  border: 1px solid var(--line);
  border-collapse: collapse;
  white-space: normal;
  background: rgba(255, 255, 255, 0.55);
}

.markdown-body th,
.markdown-body td {
  border-bottom: 1px solid var(--line);
  border-right: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
  line-height: 1.5;
}

.markdown-body th:last-child,
.markdown-body td:last-child {
  border-right: 0;
}

.markdown-body tr:last-child td {
  border-bottom: 0;
}

.markdown-body th {
  color: var(--ink);
  background: rgba(15, 107, 79, 0.08);
  font-weight: 800;
}

.code-section {
  margin-top: 14px;
  border-top: 1px solid var(--line);
  padding-top: 12px;
}

.code-section:first-child {
  margin-top: 0;
  border-top: 0;
  padding-top: 0;
}

.code-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 8px;
}

.code-section h3 {
  margin: 0;
  color: var(--ink);
  font-size: 0.98rem;
}

.copy-button {
  align-self: auto;
  border: 1px solid var(--line);
  border-radius: 999px;
  padding: 6px 12px;
  color: var(--accent);
  background: #fffaf0;
  cursor: pointer;
  font-size: 0.82rem;
  font-weight: 800;
}

.code-section pre {
  overflow-x: auto;
  margin: 8px 0;
  border-radius: 12px;
  padding: 10px;
  color: #f7f4eb;
  background: #1d2a24;
  white-space: pre;
}

.code-section > .copy-button {
  display: inline-flex;
  margin-top: 2px;
}

.artifact-status {
  margin: 10px 0 0;
  color: #0d503c;
  font-weight: 800;
}

.error {
  color: var(--warn);
  font-weight: 800;
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 12px;
  padding: 20px;
  border-top: 1px solid var(--line);
  background: rgba(248, 244, 234, 0.8);
}

.site-footer {
  border-top: 1px solid var(--line);
  padding: 10px 20px 12px;
  text-align: center;
  background: rgba(248, 244, 234, 0.72);
}

.site-footer a {
  color: var(--muted);
  font-size: 0.82rem;
  text-decoration: none;
}

.site-footer a:hover {
  color: var(--accent);
  text-decoration: underline;
}

textarea {
  min-height: 68px;
  max-height: 220px;
  resize: vertical;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 14px 16px;
  color: var(--ink);
  background: #fffaf0;
  outline: none;
}

textarea:focus {
  border-color: rgba(15, 107, 79, 0.55);
  box-shadow: 0 0 0 4px rgba(15, 107, 79, 0.12);
}

button {
  align-self: stretch;
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 0 24px;
  color: var(--ink);
  background: #ffffff;
  cursor: pointer;
  font-weight: 800;
}

button:disabled {
  cursor: wait;
  opacity: 0.55;
}

@media (max-width: 720px) {
  .shell {
    width: 100vw;
    min-height: 100vh;
    margin: 0;
    border-radius: 0;
  }

  .topbar,
  .composer {
    grid-template-columns: 1fr;
    flex-direction: column;
    align-items: stretch;
  }

  .messages {
    padding: 20px;
  }

  .composer {
    display: grid;
  }

  button {
    min-height: 52px;
  }
}