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

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family);
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-size: var(--text-base);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--color-info); text-decoration: none; }
a:hover { opacity: 0.85; }

h1, h2, h3, h4, h5 {
  margin: 0;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
}
h1 { font-size: var(--text-2xl); line-height: 1.2; }
h2 { font-size: var(--text-xl); line-height: 1.25; }
h3 { font-size: var(--text-lg); line-height: 1.3; }
p { margin: 0; }

button {
  font-family: inherit;
  cursor: pointer;
}

input, select, textarea {
  font-family: inherit;
  font-size: inherit;
  color: var(--color-text-primary);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  transition: border-color var(--duration-fast) var(--ease-out),
              box-shadow var(--duration-fast) var(--ease-out);
  width: 100%;
}
input:focus, select:focus, textarea:focus {
  outline: none;
  border-color: var(--color-info);
  box-shadow: 0 0 0 3px rgba(0, 113, 227, 0.15);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-5);
}

.app-nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--color-divider);
}
:root[data-theme="dark"] .app-nav { background: rgba(0, 0, 0, 0.6); }

.app-nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
}

.app-nav .brand {
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--color-text-primary);
  font-size: var(--text-base);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.app-nav .brand .dot {
  width: 8px; height: 8px; border-radius: 50%;
  background: var(--color-info);
}

.app-nav ul {
  display: flex; gap: var(--space-5);
  list-style: none; margin: 0; padding: 0;
}
.app-nav a {
  color: var(--color-text-secondary);
  font-size: var(--text-sm);
  font-weight: 500;
}
.app-nav a:hover, .app-nav a.is-active { color: var(--color-text-primary); }
.app-nav .theme-toggle {
  background: transparent;
  border: 1px solid var(--color-border);
  color: var(--color-text-secondary);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: var(--text-xs);
  font-weight: 500;
}
.app-nav .theme-toggle:hover { background: var(--color-bg-secondary); }

.section { padding: var(--space-7) 0; }
.section.lg { padding: var(--space-9) 0 var(--space-8); }

.eyebrow {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-text-tertiary);
  font-weight: 600;
}

.muted { color: var(--color-text-secondary); }
.tertiary { color: var(--color-text-tertiary); }

.grid { display: grid; gap: var(--space-5); }
.grid.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

@media (max-width: 900px) {
  .grid.cols-3, .grid.cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .grid.cols-2, .grid.cols-3, .grid.cols-4 { grid-template-columns: 1fr; }
  .app-nav ul { display: none; }
}

.hero h1 {
  font-size: clamp(40px, 6vw, 64px);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.05;
  max-width: 780px;
}
.hero p { color: var(--color-text-secondary); font-size: var(--text-lg); max-width: 640px; }

.cta-row { display: flex; gap: var(--space-3); flex-wrap: wrap; }

.divider {
  height: 1px;
  background: var(--color-divider);
  margin: var(--space-7) 0;
}

.skeleton {
  background: linear-gradient(90deg,
    var(--color-bg-secondary) 0%,
    var(--color-bg-tertiary) 50%,
    var(--color-bg-secondary) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.4s var(--ease-out) infinite;
  border-radius: var(--radius-sm);
  display: block;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: var(--color-bg-secondary);
  color: var(--color-text-secondary);
  font-size: var(--text-xs);
  font-weight: 500;
}
.tag .dot { width: 6px; height: 6px; border-radius: 50%; background: currentColor; }
.tag.success { background: var(--color-success-soft); color: var(--color-success); }
.tag.warning { background: var(--color-warning-soft); color: var(--color-warning); }
.tag.error { background: var(--color-error-soft); color: var(--color-error); }
.tag.info { background: var(--color-info-soft); color: var(--color-info); }