:root {
  /* ===== Manus 风格：浅色系（克制、耐看） ===== */
  --page-bg: #f6f7f9;

  --card-bg: #ffffff;
  --card-bg-soft: #fafafa;

  --border: #e6e8eb;
  --border-soft: #eef0f2;

  --text-main: #1f2937;
  --text-muted: #6b7280;

  --shadow: 0 8px 24px rgba(0, 0, 0, 0.04);

  --radius: 14px;
  --radius-sm: 10px;

  /* 对话气泡 */
  --user-bg: #f1f3f5;
  --bot-bg: #ffffff;

  /* 按钮主色 */
  --accent: #111827;

  /* 错误提示 */
  --danger-bg: rgba(239, 68, 68, 0.10);
  --danger-border: rgba(239, 68, 68, 0.25);
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont,
    "Segoe UI", Roboto, "Helvetica Neue", Arial,
    "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--page-bg);
  color: var(--text-main);
}

/* ===== 布局 ===== */
.app {
  height: 100%;
  display: flex;
  flex-direction: column;
  max-width: 980px;
  margin: 0 auto;
  padding: 18px 14px 14px;
  gap: 12px;
  transition: max-width 0.2s ease;
}

.app.with-sidebar {
  max-width: 1280px;
}

.main-layout {
  flex: 1;
  min-height: 0;
  display: flex;
  gap: 12px;
  position: relative;
}

/* ===== 顶部导航栏 ===== */
.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 16px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  line-height: 1.2;
}

.brand-text {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.logo img {
  width: 36px;
  height: 36px;
  display: block;
}

.brand .title {
  font-weight: 700;
  letter-spacing: 0.2px;
  font-size: 16px;
}

.brand .sub {
  font-size: 12px;
  color: var(--text-muted);
}

.brand-clickable {
  cursor: pointer;
  transition: all 0.15s ease;
  user-select: none;
  border-radius: var(--radius-sm);
  padding: 4px 8px 4px 4px;
  display: flex;
  align-items: center;
  gap: 8px;
}

.brand-clickable:hover {
  background: var(--card-bg-soft);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.brand-history-badge {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-muted);
  background: var(--page-bg);
  border: 1px solid var(--border-soft);
  padding: 2px 6px;
  border-radius: 6px;
  display: inline-flex;
  align-items: center;
  gap: 3px;
  transition: all 0.15s;
}

.brand-clickable:hover .brand-history-badge {
  color: #2563eb;
  background: #eff6ff;
  border-color: #bfdbfe;
}

.hidden {
  display: none !important;
}

/* ===== 手机：整页不出现横向滚动，顶栏元素按宽度收缩 ===== */
@media (max-width: 640px) {
  .app {
    padding: 10px 8px 8px;
    gap: 8px;
  }

  .topbar {
    gap: 8px;
    padding: 10px 12px;
  }

  .brand {
    flex: none;
  }

  .topbar-right {
    flex: 1;
    min-width: 0;
    justify-content: flex-end;
    gap: 8px;
  }

  .model-dd {
    flex: 0 1 180px;
    min-width: 0;
  }

  .model-dd .model-trigger {
    width: 100%;
    min-width: 0;
  }

  .model-trigger-text {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .auth-open-btn {
    flex: none;
    padding: 6px 10px;
    white-space: nowrap;
  }
}

/* ===== 站点公告（announcement.js） ===== */
.announcement-wrap {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 0;
}

.announcement-bar {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  border: 1px solid #bfdbfe;
  background: #eff6ff;
  color: #1e3a8a;
  font-size: 13px;
  line-height: 1.5;
}

.announcement-bar.level-warning {
  border-color: #fde68a;
  background: #fffbeb;
  color: #92400e;
}

.announcement-bar.level-success {
  border-color: #bbf7d0;
  background: #f0fdf4;
  color: #166534;
}

.announcement-text {
  flex: 1;
  min-width: 0;
  white-space: pre-wrap;
  word-break: break-word;
}

.announcement-text strong {
  margin-right: 8px;
}

.announcement-close {
  border: none;
  background: transparent;
  color: inherit;
  font-size: 18px;
  line-height: 1;
  cursor: pointer;
  opacity: 0.6;
  padding: 0 2px;
}

.announcement-close:hover {
  opacity: 1;
}