* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
}

body {
  min-height: 100vh;
  font-family: "Segoe UI Variable", "Noto Sans SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background: linear-gradient(180deg, var(--bg-top), var(--bg-bottom));
}

#app {
  min-height: 100vh;
}

.shell {
  width: min(1240px, calc(100% - 32px));
  margin: 20px auto 28px;
}

.app-header {
  display: grid;
  gap: 14px;
  margin-bottom: 16px;
}

.app-header__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.app-title {
  margin: 0;
  font-size: clamp(1.32rem, 2.2vw, 1.8rem);
  color: var(--text-strong);
}

.app-subtitle {
  margin: 4px 0 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.app-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.28fr) minmax(0, 1fr);
  gap: 16px;
}

.app-column {
  display: grid;
  gap: 16px;
  align-content: start;
}

/* 紫苏自绘标题栏：只在 WebView2 窗口里显示 */
.zisu-titlebar {
  display: none;
  position: sticky;
  top: 0;
  z-index: 100;
  height: 44px;
  align-items: center;
  justify-content: space-between;
  padding: 0 6px 0 16px;
  border-bottom: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(10px);
  -webkit-app-region: drag;
  user-select: none;
}

body.zisu-app {
  overflow: hidden;
}

body.zisu-app .zisu-titlebar {
  display: flex;
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
}

body.zisu-app #app {
  margin-top: 44px;
  height: calc(100vh - 44px);
  overflow-y: auto;
}

body.zisu-app #app::-webkit-scrollbar {
  width: 10px;
}

body.zisu-app #app::-webkit-scrollbar-track {
  background: transparent;
}

body.zisu-app #app::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 999px;
}

body.zisu-app #app::-webkit-scrollbar-thumb:hover {
  background: var(--accent-strong);
}

.zisu-titlebar__title {
  font-size: 0.9rem;
  color: var(--text-strong);
  font-weight: 640;
  letter-spacing: 0.3px;
}

.zisu-titlebar__actions {
  display: flex;
  gap: 4px;
  -webkit-app-region: no-drag;
}

.zisu-titlebar__btn {
  width: 34px;
  height: 30px;
  border: 1px solid transparent;
  border-radius: 8px;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.9rem;
  cursor: pointer;
}

.zisu-titlebar__btn:hover {
  background: var(--accent-soft);
  color: var(--on-accent);
}

.zisu-titlebar__btn--close:hover {
  background: #fce3e7;
  color: #c0566b;
}

body.zisu-app .shell {
  margin-top: 12px;
}

@media (max-width: 1080px) {
  .shell {
    width: min(1240px, calc(100% - 20px));
    margin-top: 14px;
  }

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