:root {
  color-scheme: light;
  --bg: #f4f2ed;
  --panel: #fffdfa;
  --panel-strong: #f8f4ec;
  --text: #1f2528;
  --muted: #667075;
  --line: #ded8ce;
  --accent: #357a78;
  --accent-strong: #195f61;
  --accent-soft: #d8eeeb;
  --danger: #a84444;
  --shadow: 0 18px 44px rgba(31, 37, 40, 0.08);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #171918;
  --panel: #222624;
  --panel-strong: #292e2b;
  --text: #f2f0ea;
  --muted: #adb6b1;
  --line: #3c433f;
  --accent: #6fb8aa;
  --accent-strong: #a0d8cc;
  --accent-soft: #203b38;
  --danger: #ff9f9f;
  --shadow: 0 18px 44px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
}

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

button {
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--text);
  border-radius: 8px;
  min-height: 36px;
  padding: 0 12px;
  cursor: pointer;
}

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

button:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

select,
input,
textarea {
  width: 100%;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel);
  color: var(--text);
  padding: 10px 11px;
  outline: none;
}

textarea {
  resize: vertical;
  line-height: 1.45;
}

select:focus,
input:focus,
textarea:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.app-shell {
  display: grid;
  grid-template-columns: minmax(360px, 440px) 1fr;
  gap: 16px;
  height: 100vh;
  padding: 16px;
  overflow: hidden;
}

.sidebar,
.chat-panel,
.prompt-panel {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.sidebar {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 32px);
  min-height: 0;
  overflow: hidden;
}

.brand-row,
.panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px;
  border-bottom: 1px solid var(--line);
}

h1,
h2,
p {
  margin: 0;
}

h1 {
  font-size: 22px;
  line-height: 1.1;
}

h2 {
  font-size: 18px;
}

.eyebrow {
  color: var(--accent-strong);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

.icon-button {
  width: 38px;
  padding: 0;
  font-size: 18px;
}

.preset-bar {
  display: grid;
  gap: 8px;
  padding: 14px 16px;
  border-bottom: 1px solid var(--line);
}

.preset-bar > label,
.settings-form label {
  display: grid;
  gap: 7px;
  color: var(--muted);
  font-size: 13px;
  font-weight: 650;
}

.preset-actions {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 8px;
}

.tabs {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  padding: 10px;
  gap: 8px;
  border-bottom: 1px solid var(--line);
}

.tab {
  background: transparent;
}

.tab.is-active {
  background: var(--accent-soft);
  border-color: var(--accent);
  color: var(--accent-strong);
}

.settings-form {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 16px;
}

.tab-panel {
  display: none;
  gap: 14px;
}

.tab-panel.is-active {
  display: grid;
}

.field-grid {
  display: grid;
  gap: 12px;
}

.field-grid.two {
  grid-template-columns: 1fr 1fr;
}

.field-list-toolbar {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
}

.prompt-fields {
  display: grid;
  gap: 12px;
}

.prompt-field {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: stretch;
  gap: 8px;
}

.prompt-field textarea {
  min-height: 132px;
}

.field-controls {
  display: grid;
  grid-template-rows: repeat(3, 36px);
  gap: 6px;
}

.field-controls button {
  width: 38px;
  padding: 0;
  font-size: 17px;
  line-height: 1;
}

.toggle-row {
  display: flex;
  align-items: center;
  gap: 18px;
  flex-wrap: wrap;
}

.checkbox-label {
  display: inline-flex !important;
  grid-template-columns: auto 1fr;
  align-items: center;
  gap: 8px !important;
}

.checkbox-label input {
  width: 18px;
  height: 18px;
}

.range-value,
.stats {
  color: var(--muted);
  font-size: 12px;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(420px, 1fr) minmax(360px, 0.82fr);
  gap: 16px;
  min-height: 0;
  min-width: 0;
}

.chat-panel,
.prompt-panel {
  display: flex;
  flex-direction: column;
  height: calc(100vh - 32px);
  min-height: 0;
  min-width: 0;
}

.toolbar {
  display: flex;
  gap: 8px;
}

.messages {
  flex: 1;
  min-height: 0;
  overflow: auto;
  padding: 18px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.message {
  max-width: 82%;
  border-radius: 8px;
  padding: 11px 13px;
  line-height: 1.45;
  white-space: pre-wrap;
  border: 1px solid var(--line);
}

.message.user {
  align-self: flex-end;
  background: var(--accent);
  border-color: var(--accent);
  color: #ffffff;
}

.message.assistant {
  align-self: flex-start;
  background: var(--panel-strong);
}

.message.thinking {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  color: var(--muted);
}

.spinner {
  width: 16px;
  height: 16px;
  border: 2px solid var(--line);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  flex: 0 0 auto;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

.message.system {
  align-self: center;
  max-width: 92%;
  color: var(--muted);
  background: transparent;
  border-style: dashed;
  font-size: 13px;
}

.composer {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 10px;
  padding: 16px;
  border-top: 1px solid var(--line);
}

.composer button {
  min-width: 84px;
  background: var(--accent);
  border-color: var(--accent);
  color: white;
}

.prompt-panel pre {
  flex: 1;
  min-height: 0;
  margin: 0;
  padding: 16px;
  overflow: auto;
  white-space: pre-wrap;
  line-height: 1.48;
  font-size: 13px;
}

@media (max-width: 1160px) {
  .app-shell,
  .workspace {
    grid-template-columns: 1fr;
  }

  .app-shell {
    height: auto;
    min-height: 100vh;
    overflow: visible;
  }

  .sidebar,
  .prompt-panel {
    height: auto;
    min-height: auto;
  }

  .chat-panel {
    height: calc(100vh - 32px);
    min-height: 520px;
  }

  .prompt-panel {
    max-height: 620px;
  }

  .messages {
    min-height: 0;
  }
}

@media (max-width: 620px) {
  .app-shell {
    padding: 8px;
  }

  .field-grid.two,
  .field-list-toolbar,
  .preset-actions,
  .composer {
    grid-template-columns: 1fr;
  }

  .prompt-field {
    grid-template-columns: 1fr;
  }

  .field-controls {
    grid-template-columns: repeat(3, 38px);
    grid-template-rows: 36px;
    justify-content: end;
  }

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