:root {
  /* -- Colors -- */
  --color-primary: hsl(221, 83%, 53%);      /* #2563eb */
  --color-primary-light: hsl(221, 83%, 90%);
  --color-primary-dark: hsl(221, 83%, 40%);
  --color-accent: hsl(280, 60%, 60%);       /* Purple accent for gradients */

  --color-bg: hsl(210, 40%, 98%);           /* #f8fafc */
  --color-bg-alt: hsl(0, 0%, 100%);         /* #ffffff */
  
  --color-text: hsl(222, 47%, 11%);         /* #0f172a */
  --color-text-muted: hsl(215, 16%, 47%);   /* #64748b */
  --color-border: hsl(214, 32%, 91%);       /* #e2e8f0 */

  /* -- Typography -- */
  --font-heading: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;

  /* -- Layout -- */
  --max-width: 1280px;

  /* ── Standard Tokens (auto-injected) ── */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4rem;
  --space-4xl: 6rem;
  --radius-default: 4px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 30px rgba(0, 0, 0, 0.12);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.15);
}

/* -- Custom Animations -- */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

.animate-float {
  animation: float 4s ease-in-out infinite;
}

/* -- Reveal Effects -- */
[data-reveal] {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* Staggered delays */
[data-reveal-stagger] > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}
[data-reveal-stagger].is-visible > * {
  opacity: 1;
  transform: translateY(0);
}
[data-reveal-stagger].is-visible > *:nth-child(1) { transition-delay: 0ms; }
[data-reveal-stagger].is-visible > *:nth-child(2) { transition-delay: 100ms; }
[data-reveal-stagger].is-visible > *:nth-child(3) { transition-delay: 200ms; }
[data-reveal-stagger].is-visible > *:nth-child(4) { transition-delay: 300ms; }

/* -- Icons -- */
.icon {
  display: inline-block;
  width: 1.25em;
  height: 1.25em;
  vertical-align: -0.15em;
  flex-shrink: 0;
}
html { scroll-behavior: smooth; }
body { margin: 0; }

/* ── Base typography (auto-injected) ── */
body { font-family: var(--font-body, 'Noto Sans KR', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Segoe UI', system-ui, sans-serif); }
h1, h2, h3, h4, h5, h6 { font-family: var(--font-heading, var(--font-body, 'Noto Sans KR', 'Apple SD Gothic Neo', 'Malgun Gothic', 'Segoe UI', system-ui, sans-serif)); }