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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  cursor: var(--theme-cursor);
}

body.theme-ready {
  transition: background-color var(--transition-normal), color var(--transition-normal);
}

a {
  color: var(--text-link);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover { text-decoration: underline; }

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  background: none;
  font-size: inherit;
  color: inherit;
}

code, pre {
  font-family: var(--font-mono);
}

img { max-width: 100%; display: block; }

::-webkit-scrollbar { width: 8px; height: 8px; }
::-webkit-scrollbar-track { background: var(--scrollbar-track); }
::-webkit-scrollbar-thumb {
  background: var(--scrollbar-thumb);
  border-radius: 4px;
}
::-webkit-scrollbar-thumb:hover { background: var(--scrollbar-thumb-hover); }

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

#app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 56px;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-primary);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 24px;
  z-index: var(--z-dropdown);
  transition: background-color var(--transition-normal), border-color var(--transition-normal);
  backdrop-filter: blur(8px);
}

.header-hidden #app-header {
  display: none;
}

#app-header .logo-group {
  display: flex;
  align-items: center;
  gap: 10px;
}

#app-header .logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 16px;
  color: var(--text-primary);
  text-decoration: none;
  cursor: pointer;
}

#app-header .logo-byline {
  font-size: 11px;
  font-weight: 500;
  color: var(--text-tertiary);
  text-decoration: none;
  transition: color var(--transition-fast);
  white-space: nowrap;
}

#app-header .logo-byline:hover {
  color: var(--accent-primary);
  text-decoration: none;
}

#app-header .logo-icon {
  width: 34px;
  height: 34px;
  min-width: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-md);
  background: var(--bg-secondary);
  border: 1px solid var(--border-primary);
  transition: background-color var(--transition-fast), border-color var(--transition-fast);
}

#app-header .logo-icon svg {
  width: 24px;
  height: auto;
}

#app-header .logo:hover .logo-icon {
  background: var(--accent-light);
  border-color: var(--accent-primary);
}

#app-header nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

#app-header nav a,
#app-header nav button:not(.theme-toggle) {
  padding: 6px 14px;
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: all var(--transition-fast);
}

#app-header nav a:hover,
#app-header nav button:not(.theme-toggle):hover {
  background: var(--bg-hover);
  color: var(--text-primary);
  text-decoration: none;
}

#app-header nav a.active {
  background: var(--accent-light);
  color: var(--accent-primary);
}

#app-content {
  padding-top: 56px;
  min-height: 100vh;
}

.header-hidden #app-content {
  padding-top: 0;
}

.view { display: none; }
.view.active { display: block; }

@media (max-width: 768px) {
  #app-header { padding: 0 16px; }
  #app-header .logo-byline { display: none; }
  #app-header nav { gap: 4px; }
  #app-header nav a,
  #app-header nav button {
    padding: 6px 10px;
    font-size: 13px;
  }
}