/* 首次引导（契约 7C）——Warm Paper 全屏向导：衬线大标题 + 圆点进度 + 大量留白 */

.ob-overlay {
  position: fixed;
  inset: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 24px;
  background: var(--bg);
  animation: ob-fade 200ms var(--ease);
}

@keyframes ob-fade {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes ob-rise {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

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

/* 右上角「跳过引导」：文字按钮，安静但一直在 */
.ob-skip {
  position: absolute;
  top: 18px;
  right: 22px;
  height: 30px;
  padding: 0 12px;
  border: none;
  border-radius: var(--radius-chip);
  background: transparent;
  color: var(--text-tertiary);
  font-family: inherit;
  font-size: 12.5px;
  cursor: pointer;
  transition:
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease);
}

.ob-skip:hover {
  background: var(--bg-elevated);
  color: var(--text);
}

.ob-card {
  width: min(620px, 100%);
  max-height: 100%;
  overflow-y: auto;
  padding: 44px 48px 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-float);
  background: var(--bg);
  box-shadow: var(--shadow-float);
  animation: ob-rise 220ms var(--ease);
}

.ob-brand {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 26px;
  color: var(--text-secondary);
  font-size: 13px;
  letter-spacing: 0.01em;
}

/* ── 圆点进度：做完的实心浅陶土，当前的深陶土，未到的描边 ───────── */

.ob-dots {
  display: flex;
  gap: 8px;
  margin-bottom: 24px;
}

.ob-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: transparent;
  border: 1px solid var(--border);
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}

.ob-dot.is-done {
  background: var(--accent-soft);
  border-color: var(--accent-soft);
}

.ob-dot.is-active {
  background: var(--accent);
  border-color: var(--accent);
}

/* ── 标题与正文三级字阶 ───────────────────────────────────────── */

.ob-title {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 27px;
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.35;
}

.ob-sub {
  margin: 0 0 28px;
  color: var(--text-secondary);
  font-size: 14.5px;
  line-height: 1.7;
}

.ob-lede {
  margin: 0 0 4px;
  color: var(--text);
  font-size: 14.5px;
  line-height: 1.75;
}

.ob-lede a {
  color: var(--accent);
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 3px;
}

.ob-hint {
  margin: 10px 0 0;
  color: var(--text-tertiary);
  font-size: 12.5px;
  line-height: 1.65;
}

.ob-loading {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.ob-spin {
  color: var(--accent);
  animation: ob-rotate 900ms linear infinite;
}

/* ── 第一步：已就绪 + 模型清单 ────────────────────────────────── */

.ob-ready {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  color: var(--success);
  font-size: 14px;
  font-weight: 500;
}

.ob-models {
  list-style: none;
  margin: 0 0 8px;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--bg-elevated);
  overflow: hidden;
}

.ob-models li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 11px 18px;
}

.ob-models li + li {
  border-top: 1px solid var(--border);
}

.ob-model-name {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--text);
}

.ob-model-meta {
  color: var(--text-tertiary);
  font-size: 12.5px;
  font-variant-numeric: tabular-nums;
  white-space: nowrap;
}

/* ── 第二步：两个大选择 ───────────────────────────────────────── */

.ob-choices {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.ob-choice {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  padding: 18px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-card);
  background: var(--bg-elevated);
  color: var(--text);
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  transition:
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease),
    transform var(--dur) var(--ease);
}

.ob-choice:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  transform: translateY(-1px);
}

.ob-choice-text {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.ob-choice-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
}

.ob-choice-desc {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.6;
}

.ob-choice svg {
  flex: none;
  color: var(--text-tertiary);
}

/* ── 第三步：模型下拉 + 输入 + 回显 ───────────────────────────── */

.ob-field {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 14px;
}

.ob-field > span {
  color: var(--text-tertiary);
  font-size: 12.5px;
}

.ob-select {
  height: 38px;
  padding: 0 12px;
  border: none;
  border-radius: var(--radius-control);
  background: var(--bg-sunken);
  color: var(--text);
  font-family: inherit;
  font-size: 13.5px;
  cursor: pointer;
  transition: box-shadow var(--dur) var(--ease);
}

.ob-select:focus {
  outline: none;
  box-shadow: 0 0 0 1px var(--accent);
}

.ob-textarea {
  width: 100%;
  padding: 12px 14px;
  border: none;
  border-radius: var(--radius-control);
  background: var(--bg-sunken);
  color: var(--text);
  font-family: inherit;
  font-size: 14.5px;
  line-height: 1.7;
  resize: none;
  user-select: text;
  cursor: text;
  transition: box-shadow var(--dur) var(--ease);
}

.ob-textarea:focus {
  outline: none;
  box-shadow: 0 0 0 1px var(--accent);
}

.ob-transcript {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-top: 20px;
}

.ob-bubble {
  margin: 0;
  padding: 12px 16px;
  border-radius: var(--radius-card);
  font-size: 14px;
  line-height: 1.7;
  white-space: pre-wrap;
  word-break: break-word;
  user-select: text;
  animation: ob-rise 200ms var(--ease);
}

.ob-bubble.is-user {
  align-self: flex-end;
  max-width: 85%;
  background: var(--accent-soft);
}

.ob-bubble.is-assistant {
  align-self: flex-start;
  max-width: 92%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
}

/* ── 完成页与公共动作行 ───────────────────────────────────────── */

.ob-done {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  color: var(--accent);
}

.ob-done .ob-title {
  margin-top: 14px;
  color: var(--text);
}

.ob-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.ob-actions .btn-primary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.ob-actions .btn-secondary {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}