/* ============================================================
   Design system — calm/warm palette, Fraunces + Inter
   ============================================================ */

/* 1. Custom properties */
:root {
  --bg:     #FAF8F4;
  --text:   #2B2A27;
  --sage:   #6E8B74;
  --clay:   #C0855F;
  --muted:  #6A6960;
  --maxw:   1040px;

  /* Spacing scale */
  --s1: 0.25rem;
  --s2: 0.5rem;
  --s3: 1rem;
  --s4: 1.5rem;
  --s5: 2.5rem;
  --s6: 4rem;

  /* Radius & shadow */
  --r:      0.75rem;
  --shadow: 0 2px 12px rgba(43, 42, 39, 0.08);
}

/* 2. Reset */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--bg);
  color: var(--text);
  font-family: Inter, system-ui, sans-serif;
  line-height: 1.6;
}

/* 3. Headings */
h1, h2, h3, h4, h5, h6 {
  font-family: 'Fraunces', Georgia, serif;
  line-height: 1.1;
  font-weight: 600;
}

h1 {
  font-size: clamp(2rem, 5vw + 1rem, 3.75rem);
}

h2 {
  font-size: clamp(1.5rem, 3vw + 0.75rem, 2.5rem);
}

h3 {
  font-size: 1.25rem;
}

/* 4. Container */
.container {
  max-width: var(--maxw, 1040px);
  margin-inline: auto;
  padding-inline: clamp(1rem, 4vw, 2rem);
}

/* 5. Section */
.section {
  padding-block: clamp(3rem, 8vw, 6rem);
}

/* 6. Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--s2);
  padding: var(--s2) var(--s4);
  border-radius: 999px;
  border: 1.5px solid var(--text);
  background: transparent;
  color: var(--text);
  font-family: Inter, system-ui, sans-serif;
  font-size: 0.9rem;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s;
}

.btn:hover {
  opacity: 0.75;
  transform: translateY(-1px);
}

.btn-primary {
  background: var(--sage);
  border-color: var(--sage);
  color: #fff;
}

.btn-primary:hover {
  opacity: 0.85;
  transform: translateY(-1px);
}

/* 7. Chip */
.chip {
  display: inline-block;
  padding: var(--s1) var(--s3);
  border-radius: 999px;
  background: color-mix(in srgb, var(--sage) 15%, var(--bg));
  color: var(--text);
  font-size: 0.8rem;
  font-weight: 500;
  white-space: nowrap;
}

/* 8. Card */
.card {
  border-radius: var(--r);
  background: #fff;
  box-shadow: var(--shadow);
  padding: var(--s4);
  transition: transform 0.25s, box-shadow 0.25s;
}

.card:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 24px rgba(43, 42, 39, 0.12);
}

a.card {
  text-decoration: none;
  color: inherit;
}

/* 9. Metric */
.metric {
  display: grid;
  place-items: center;
  text-align: center;
  padding: var(--s4);
  border-radius: var(--r);
  background: #fff;
  box-shadow: var(--shadow);
}

.metric__num {
  font-family: 'Fraunces', Georgia, serif;
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 700;
  line-height: 1;
  color: var(--clay);
}

/* 10. Timeline */
.timeline {
  position: relative;
  padding-left: var(--s5);
}

.timeline::before {
  content: '';
  position: absolute;
  left: calc(var(--s3) - 0.5px);
  top: 0;
  bottom: 0;
  width: 1px;
  background: color-mix(in srgb, var(--sage) 40%, var(--bg));
}

.timeline__item {
  position: relative;
  padding-bottom: var(--s5);
}

.timeline__item:last-child {
  padding-bottom: 0;
}

.timeline__item::before {
  content: '';
  position: absolute;
  left: calc(-1 * var(--s5) + var(--s3) - 5px);
  top: 0.35em;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--sage);
  border: 2px solid var(--bg);
  box-shadow: 0 0 0 1.5px var(--sage);
}

/* 11. Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s, transform 0.6s;
}

.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* 12. Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  html {
    scroll-behavior: auto;
  }
}

/* 13. Responsive — grids collapse to 1 col under 640px */
@media (max-width: 640px) {
  .metric,
  [class*="grid"] {
    grid-template-columns: 1fr !important;
  }
}