* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: "Inter", "Helvetica Neue", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--ink);
  font-size: 14px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  letter-spacing: -0.003em;
}
.app { display: flex; min-height: 100vh; }
/* ============ 侧边栏 ============ */
.sidebar {
  width: 280px;
  background: #fff;
  border-right: 1px solid var(--line);
  padding: 32px 0 24px;
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.logo { padding: 0 24px 24px; border-bottom: 1px solid var(--line); margin-bottom: 24px; }
.logo .title {
  font-size: 13px;
  font-weight: 700;
  color: var(--black);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  display: flex;
  align-items: center;
  gap: 10px;
}
.logo .title .dot { width: 10px; height: 10px; background: var(--red); flex-shrink: 0; }
.logo .sub { font-size: 11px; color: var(--gray-2); margin-top: 10px; letter-spacing: 0.02em; }
.sidebar-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}
.sidebar-scroll::-webkit-scrollbar { display: none; }
.sidebar-actions {
  flex-shrink: 0;
  padding: 12px 24px 0;
  border-top: 1px solid var(--line);
  background: #fff;
}
.sidebar-section {
  font-size: 10px;
  color: var(--gray-2);
  padding: 0 24px;
  margin-bottom: 12px;
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 700;
}
.project-item {
  padding: 12px 24px 12px 21px;
  cursor: pointer;
  border-left: 3px solid transparent;
  transition: background .15s, border-color .15s;
}
.project-item:hover { background: var(--bg-soft); }
.project-item.active {
  background: var(--bg-soft);
  border-left-color: var(--red);
}
.project-item.active .name { color: var(--black); }
.project-item .name { font-weight: 600; font-size: 13px; color: var(--ink); }
.project-item .meta { font-size: 11px; color: var(--gray-2); margin-top: 4px; letter-spacing: 0.01em; }
.project-actions {
  display: flex;
  gap: 4px;
  opacity: 0;
  transition: opacity .15s;
}
.project-item:hover .project-actions,
.project-item.active .project-actions { opacity: 1; }
.project-actions .btn {
  padding: 4px 6px;
  min-height: 24px;
}
.btn-new-project {
  margin: 16px 0 0;
  padding: 12px;
  text-align: center;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border: 1px solid var(--line);
  color: var(--ink);
  cursor: pointer;
  transition: all .15s;
  font-size: 11px;
  background: #fff;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-weight: 700;
}
.sidebar-actions .btn-new-project:first-child { margin-top: 0; }
.btn-new-project:hover { background: var(--black); color: #fff; border-color: var(--black); }
/* ============ 主区 ============ */
.main {
  flex: 1;
  padding: 40px 48px;
  overflow: auto;
  max-width: 1280px;
  background: #fff;
}
.header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 32px;
  gap: 16px;
  padding-bottom: 24px;
  border-bottom: 1px solid var(--line);
}
.header h1 {
  font-size: 28px;
  font-weight: 800;
  color: var(--black);
  letter-spacing: -0.02em;
  line-height: 1.2;
}
.header .desc { color: var(--gray-1); font-size: 13px; margin-top: 8px; line-height: 1.6; }
/* ============ 杂项 ============ */
.empty { text-align: center; color: var(--gray-2); padding: 60px 20px; }
.empty .icon {
  margin-bottom: 16px;
  opacity: .35;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--black);
}
.text-muted { color: var(--gray-2); }
.text-success { color: var(--green); }
.text-danger { color: var(--red); }
.text-warning { color: var(--amber); }
.text-primary { color: var(--red); }
.flex { display: flex; }
.flex-1 { flex: 1; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.mb-8 { margin-bottom: 8px; }
.mb-12 { margin-bottom: 12px; }
.mb-16 { margin-bottom: 16px; }
.mt-8 { margin-top: 8px; }
.mt-12 { margin-top: 12px; }
.text-sm { font-size: 12px; }
.text-xs { font-size: 11px; }
.pre { white-space: pre-wrap; }
.code {
  background: var(--bg-soft);
  padding: 2px 6px;
  border-radius: 2px;
  font-family: "SF Mono", "JetBrains Mono", monospace;
  font-size: 12px;
  border: 1px solid var(--line);
}
details summary { outline: none; padding: 6px 0; font-size: 11px; text-transform: uppercase; letter-spacing: 0.08em; font-weight: 700; color: var(--gray-1); }
details summary:hover { color: var(--black); cursor: pointer; }