:root {
  --bg: #f4f6f3;
  --panel: #ffffff;
  --ink: #18201d;
  --muted: #64706b;
  --line: #dfe6e1;
  --teal: #0f766e;
  --teal-dark: #115e59;
  --gold: #b7791f;
  --red: #b42318;
  --green-soft: #e8f3ef;
  --gold-soft: #fbf2df;
  --shadow: 0 16px 40px rgba(24, 32, 29, 0.08);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background: var(--bg);
  font-family:
    Inter,
    "Microsoft YaHei",
    "PingFang SC",
    Arial,
    sans-serif;
}

button,
textarea {
  font: inherit;
}

.topbar {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.92);
  position: sticky;
  top: 0;
  z-index: 5;
}

.topbar h1 {
  margin: 2px 0 0;
  font-size: 24px;
  line-height: 1.2;
  letter-spacing: 0;
}

.eyebrow {
  margin: 0;
  color: var(--teal-dark);
  font-size: 12px;
  font-weight: 700;
}

.top-actions,
.question-actions,
.export-row,
.input-row {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
}

.workspace {
  display: grid;
  grid-template-columns: minmax(220px, 280px) minmax(420px, 1fr) minmax(360px, 520px);
  gap: 16px;
  padding: 16px;
  height: calc(100vh - 77px);
}

.flow-panel,
.chat-panel,
.preview-panel {
  min-width: 0;
  overflow: auto;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: var(--shadow);
}

.flow-panel,
.preview-panel {
  padding: 16px;
}

.chat-panel {
  display: flex;
  flex-direction: column;
  padding: 16px;
  gap: 14px;
}

.panel-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
  font-weight: 800;
}

.steps {
  display: grid;
  gap: 8px;
}

.step {
  width: 100%;
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 10px;
  align-items: start;
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  text-align: left;
  cursor: pointer;
}

.step strong {
  display: block;
  font-size: 14px;
}

.step span {
  color: var(--muted);
  font-size: 12px;
}

.step.current {
  border-color: var(--teal);
  background: var(--green-soft);
}

.step.done .mark {
  color: var(--teal);
}

.mark {
  width: 22px;
  height: 22px;
  display: inline-grid;
  place-items: center;
  border-radius: 50%;
  background: var(--green-soft);
  font-size: 13px;
  font-weight: 900;
}

.facts {
  margin-top: 20px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
}

.facts h2 {
  margin: 0 0 12px;
  font-size: 15px;
}

.facts dl {
  margin: 0;
  display: grid;
  gap: 10px;
}

.facts dt {
  color: var(--muted);
  font-size: 12px;
}

.facts dd {
  margin: 2px 0 0;
  font-weight: 700;
}

.assistant-card,
.open-question {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 16px;
  background: #fff;
}

.assistant-card h2 {
  margin: 6px 0 8px;
  font-size: 20px;
  line-height: 1.35;
  letter-spacing: 0;
}

.assistant-card p {
  color: var(--muted);
}

.options {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 14px 0;
}

.option-btn {
  min-height: 46px;
  padding: 10px 12px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  text-align: left;
  cursor: pointer;
}

.option-btn:hover,
.option-btn.selected {
  border-color: var(--teal);
  background: var(--green-soft);
}

.open-question label {
  display: block;
  margin-bottom: 8px;
  font-weight: 800;
}

textarea {
  width: 100%;
  resize: vertical;
  min-height: 78px;
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 10px;
  color: var(--ink);
  outline: none;
}

textarea:focus {
  border-color: var(--teal);
}

.input-row {
  justify-content: space-between;
  margin-top: 8px;
  color: var(--muted);
  font-size: 13px;
}

.messages {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 6px;
}

.message {
  max-width: 86%;
  padding: 10px 12px;
  border-radius: 8px;
  line-height: 1.55;
  white-space: pre-wrap;
  overflow-x: auto;
}

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

.message.user {
  align-self: flex-end;
  color: #fff;
  background: var(--teal-dark);
}

.message.meta {
  align-self: center;
  max-width: 100%;
  color: var(--muted);
  background: var(--gold-soft);
  font-size: 13px;
}

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

.message.markdown h1,
.message.markdown h2,
.message.markdown h3,
.message.markdown h4 {
  margin: 4px 0 8px;
  line-height: 1.35;
  letter-spacing: 0;
}

.message.markdown h1 {
  font-size: 20px;
}

.message.markdown h2 {
  font-size: 18px;
}

.message.markdown h3,
.message.markdown h4 {
  font-size: 16px;
}

.message.markdown p {
  margin: 6px 0;
}

.message.markdown ul,
.message.markdown ol {
  margin: 8px 0;
  padding-left: 22px;
}

.message.markdown li {
  margin: 4px 0;
}

.message.markdown code {
  padding: 1px 5px;
  border-radius: 5px;
  background: rgba(17, 94, 89, 0.1);
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92em;
}

.message.markdown pre {
  margin: 10px 0;
  padding: 10px;
  border-radius: 8px;
  overflow-x: auto;
  background: #13201d;
}

.message.markdown pre code {
  padding: 0;
  color: #f7faf8;
  background: transparent;
}

.message.markdown table {
  width: 100%;
  min-width: 420px;
  margin: 10px 0;
  border-collapse: collapse;
  background: #fff;
}

.message.markdown th,
.message.markdown td {
  padding: 8px;
  border: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
}

.message.markdown th {
  background: var(--green-soft);
  font-weight: 800;
}

.preview {
  display: grid;
  gap: 14px;
  line-height: 1.6;
}

.preview h2,
.preview h3 {
  margin: 0;
  letter-spacing: 0;
}

.preview h2 {
  font-size: 22px;
}

.preview h3 {
  font-size: 16px;
}

.preview-section {
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 14px;
}

.preview-section ul,
.preview-section ol {
  margin: 10px 0 0;
  padding-left: 20px;
}

.slide-list {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.slide-list li {
  padding: 10px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.primary-btn,
.ghost-btn,
.danger-btn {
  min-height: 38px;
  padding: 8px 13px;
  border-radius: 8px;
  border: 1px solid transparent;
  cursor: pointer;
  font-weight: 800;
}

.primary-btn {
  color: #fff;
  background: var(--teal);
}

.primary-btn:hover {
  background: var(--teal-dark);
}

.ghost-btn {
  color: var(--ink);
  background: #fff;
  border-color: var(--line);
}

.ghost-btn:hover {
  border-color: var(--teal);
}

.danger-btn {
  color: var(--red);
  background: #fff;
  border-color: #f0c7c2;
}

.small {
  min-height: 30px;
  padding: 5px 10px;
  font-size: 13px;
}

.export-row {
  margin-top: 14px;
  justify-content: flex-end;
}

.toast {
  position: fixed;
  left: 50%;
  bottom: 18px;
  transform: translateX(-50%);
  max-width: min(520px, calc(100vw - 32px));
  padding: 10px 14px;
  border-radius: 8px;
  color: #fff;
  background: rgba(24, 32, 29, 0.94);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
}

.toast.show {
  opacity: 1;
}

@media (max-width: 1100px) {
  .workspace {
    grid-template-columns: 1fr;
    height: auto;
  }

  .flow-panel,
  .chat-panel,
  .preview-panel {
    overflow: visible;
  }
}

@media (max-width: 640px) {
  .topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .workspace {
    padding: 10px;
  }

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

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