/* ============================================================
   Design Tokens
   ============================================================ */
:root {
  /* Brand / primary */
  --c-primary: #2563EB;
  --c-primary-600: #1D4ED8;
  --c-primary-400: #3B82F6;
  --c-primary-soft: #EFF6FF;

  /* Backgrounds */
  --c-bg: #F8FAFC;
  --c-surface: #FFFFFF;

  /* Text */
  --c-text: #0F172A;
  --c-text-muted: #475569;
  --c-text-faint: #94A3B8;

  /* Functional */
  --c-success: #10B981;
  --c-danger: #EF4444;
  --c-warning: #F59E0B;

  /* Borders / lines */
  --c-border: #E2E8F0;
  --c-border-strong: #CBD5E1;

  /* Ad slot */
  --c-ad-bg: #F1F5F9;
  --c-ad-border: #E2E8F0;

  /* Radius */
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --r-xl: 28px;
  --r-full: 999px;

  /* Shadow */
  --sh-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --sh-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --sh-lg: 0 18px 50px rgba(15, 23, 42, 0.12);
  --sh-brand: 0 12px 30px rgba(37, 99, 235, 0.25);

  /* Spacing scale */
  --s-1: 4px;
  --s-2: 8px;
  --s-3: 12px;
  --s-4: 16px;
  --s-5: 24px;
  --s-6: 32px;
  --s-7: 48px;
  --s-8: 64px;
  --s-9: 96px;

  /* Layout */
  --maxw: 1200px;
  --nav-h: 68px;

  /* Typography */
  --font: 'Roboto', system-ui, -apple-system, 'Segoe UI', Arial, sans-serif;
}

/* ============================================================
   Reset & base
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--c-text);
  background: var(--c-bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 { margin: 0; font-weight: 700; line-height: 1.2; color: var(--c-text); }
h1 { font-size: 36px; letter-spacing: -0.02em; }
h2 { font-size: 28px; letter-spacing: -0.01em; }
h3 { font-size: 20px; font-weight: 500; }
p { margin: 0; }

a { color: var(--c-primary); text-decoration: none; transition: color .2s ease; }
a:hover { color: var(--c-primary-600); }

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

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

/* ============================================================
   Layout helpers
   ============================================================ */
.container { width: 100%; max-width: var(--maxw); margin: 0 auto; padding: 0 var(--s-5); }

.section { padding: var(--s-8) 0; }
.section-sm { padding: var(--s-7) 0; }

.grid { display: grid; gap: var(--s-5); }
.grid-cards { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }

.stack { display: flex; flex-direction: column; gap: var(--s-4); }
.row { display: flex; gap: var(--s-3); align-items: center; }
.between { justify-content: space-between; }
.wrap { flex-wrap: wrap; }
.center { align-items: center; justify-content: center; }

.muted { color: var(--c-text-muted); }
.faint { color: var(--c-text-faint); }
.text-center { text-align: center; }

/* Eyebrow / kicker */
.eyebrow {
  display: inline-block;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--c-primary);
  background: var(--c-primary-soft);
  padding: 6px 14px;
  border-radius: var(--r-full);
}

/* Tool page two-column layout: content + sidebar ad */
.tool-layout {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--s-6);
  align-items: start;
}
@media (max-width: 980px) {
  .tool-layout { grid-template-columns: 1fr; }
}

/* ============================================================
   Utilities
   ============================================================ */
.hidden { display: none !important; }
.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;
}