*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  -webkit-tap-highlight-color: transparent;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  overscroll-behavior: none;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#app {
  height: 100vh;
  height: 100dvh;
  display: flex;
  flex-direction: column;
}

/* Layout: sidebar + main */
.layout {
  flex: 1;
  display: flex;
  position: relative;
  overflow: hidden;
}

main {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding: 0 clamp(16px, 4vw, 32px);
  padding-top: max(16px, env(safe-area-inset-top));
  padding-bottom: max(16px, env(safe-area-inset-bottom));
  width: 100%;
  max-width: 720px;
  margin: 0 auto;
  overflow-y: auto;
  -webkit-overflow-scrolling: touch;
}

.fade-in { animation: fadeIn 0.25s ease; }
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-out { animation: fadeOut 0.2s ease forwards; }
@keyframes fadeOut {
  from { opacity: 1; transform: translateY(0); }
  to { opacity: 0; transform: translateY(-8px); }
}