* , *::before, *::after { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  transition: background-color 0.2s ease, color 0.2s ease;
}
h1, h2, h3, h4, h5 { margin: 0 0 0.5em; line-height: 1.25; font-weight: 700; }
h1 { font-size: 1.9rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }
a { color: var(--color-primary); text-decoration: none; }
a:hover { text-decoration: underline; }
button { font-family: inherit; }
ul, ol { padding-left: 1.3em; }
img, svg { max-width: 100%; }
svg { display: block; }

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

.app-shell {
  display: flex;
  flex: 1;
  min-height: 0;
}

.app-main {
  flex: 1;
  min-width: 0;
  padding: 24px clamp(16px, 4vw, 40px) 60px;
  max-width: 1180px;
  margin: 0 auto;
  width: 100%;
}

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 10px clamp(16px, 4vw, 32px);
  background: var(--color-bg-elevated);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 40;
}

.app-brand { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 1.05rem; }
.app-brand .brand-leaf { color: var(--color-primary); }

.app-nav { display: flex; gap: 4px; flex-wrap: wrap; }
.app-nav a {
  color: var(--color-text-muted);
  font-weight: 600;
  font-size: 0.88rem;
  padding: 8px 10px;
  border-radius: var(--radius-sm);
  text-decoration: none;
}
.app-nav a:hover { background: var(--color-bg-sunken); color: var(--color-text); }
.app-nav a.active { color: var(--color-primary); background: var(--color-primary-bg); }

.header-actions { display: flex; align-items: center; gap: 10px; }

.mobile-nav-toggle { display: none; }

@media (max-width: 900px) {
  .app-nav { display: none; }
  .mobile-nav-toggle { display: inline-flex; }
}

.container-narrow { max-width: 760px; margin: 0 auto; }

.text-muted { color: var(--color-text-muted); }
.text-faint { color: var(--color-text-faint); }
.text-center { text-align: center; }
.mt-0 { margin-top: 0; }
.mb-0 { margin-bottom: 0; }

.grid { display: grid; gap: 16px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .grid-3, .grid-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; } }

.flex { display: flex; }
.flex-col { flex-direction: column; }
.items-center { align-items: center; }
.justify-between { justify-content: space-between; }
.gap-8 { gap: 8px; }
.gap-12 { gap: 12px; }
.gap-16 { gap: 16px; }
.flex-wrap { flex-wrap: wrap; }

.section { margin: 32px 0; }
.section-title { display: flex; align-items: center; justify-content: space-between; margin-bottom: 14px; }

.scroll-x { overflow-x: auto; }

::-webkit-scrollbar { width: 10px; height: 10px; }
::-webkit-scrollbar-thumb { background: var(--color-border); border-radius: 8px; }
::-webkit-scrollbar-track { background: transparent; }