:root {
  --color-primary: #FAFBFC;
  --color-secondary: #F5F6F7;
  --color-white: #FFFFFF;
  --color-accent-yellow: #FFD700;
  --color-accent-blue: #4A90E2;
  --color-accent-red: #E74C3C;
  --color-text-dark: #2C3E50;
  --color-text-medium: #4A5568;
  --color-text-light: #7F8C8D;
  --color-border: #E8EAED;
  --color-border-light: #F0F2F4;
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-size-xs: 12px;
  --font-size-sm: 14px;
  --font-size-base: 16px;
  --font-size-lg: 18px;
  --font-size-xl: 24px;
  --font-size-2xl: 32px;
  --font-size-3xl: 48px;
  --font-size-4xl: 64px;
  --line-height-body: 1.6;
  --line-height-heading: 1.2;
  --spacing-xs: 4px;
  --spacing-sm: 8px;
  --spacing-md: 16px;
  --spacing-lg: 24px;
  --spacing-xl: 32px;
  --spacing-2xl: 48px;
  --spacing-3xl: 64px;
  --spacing-4xl: 96px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 24px rgba(0,0,0,0.10);
  --shadow-xl: 0 16px 48px rgba(0,0,0,0.12);
  --transition-fast: 150ms ease;
  --transition-base: 300ms ease;
  --transition-slow: 500ms ease;
  --nav-height: 72px;
  --container-max: 1200px;
  --container-padding: var(--spacing-lg);
}

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

html { font-size: var(--font-size-base); scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-family);
  font-size: var(--font-size-base);
  line-height: var(--line-height-body);
  color: var(--color-text-dark);
  background-color: var(--color-primary);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  line-height: var(--line-height-heading);
  font-weight: 700;
  color: var(--color-text-dark);
}
h1 { font-size: clamp(2rem, 5vw, var(--font-size-3xl)); }
h2 { font-size: clamp(1.5rem, 3.5vw, var(--font-size-2xl)); }
h3 { font-size: var(--font-size-xl); }
h4 { font-size: var(--font-size-lg); }

p { color: var(--color-text-medium); margin-bottom: var(--spacing-md); }
p:last-child { margin-bottom: 0; }

a { color: var(--color-accent-blue); text-decoration: none; transition: color var(--transition-fast); }
a:hover { color: #357ABD; }
a:focus-visible { outline: 2px solid var(--color-accent-blue); outline-offset: 2px; border-radius: var(--radius-sm); }

img { max-width: 100%; height: auto; display: block; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }

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

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 var(--container-padding);
}

.section { padding: var(--spacing-3xl) 0; }
.section-alt { background-color: var(--color-secondary); }

.section-header { text-align: center; max-width: 640px; margin: 0 auto var(--spacing-2xl); }
.section-header h2 { margin-bottom: var(--spacing-md); }

.section-tag {
  display: inline-block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent-blue);
  margin-bottom: var(--spacing-sm);
}

.section-cta { text-align: center; margin-top: var(--spacing-2xl); }

.text-accent { color: var(--color-accent-yellow); }

.grid-2 { display: grid; grid-template-columns: 1fr; gap: var(--spacing-lg); }
.grid-3 { display: grid; grid-template-columns: 1fr; gap: var(--spacing-lg); }
.grid-4 { display: grid; grid-template-columns: 1fr 1fr; gap: var(--spacing-lg); }

[data-animate] { opacity: 0; transform: translateY(24px); transition: opacity var(--transition-slow), transform var(--transition-slow); }
[data-animate="fade-right"] { transform: translateX(-24px); }
[data-animate="fade-left"] { transform: translateX(24px); }
[data-animate].animate-in { opacity: 1; transform: none; }

[data-delay="100"].animate-in { transition-delay: 100ms; }
[data-delay="200"].animate-in { transition-delay: 200ms; }
[data-delay="300"].animate-in { transition-delay: 300ms; }
[data-delay="400"].animate-in { transition-delay: 400ms; }