/* =========================================================
   AR.dev - Milestones page
   Page-specific layout only. Cards, chips, tags, icon boxes,
   links and the closing panel are styled in styles.css.
========================================================= */

.milestones-page {
  overflow-x: clip;
}

/* Hero card */

.milestones-hero-copy {
  max-width: 850px;
}

.milestones-summary-number {
  margin-top: 26px;
  font-family: var(--font-heading);
  font-size: clamp(4.5rem, 7vw, 6.5rem);
  font-weight: 800;
  line-height: 0.9;
  letter-spacing: -0.1em;
}

.milestones-summary > p {
  margin-top: 10px;
  font-size: 0.92rem;
}

.milestones-summary-bottom {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  gap: 7px 16px;
  margin-top: auto;
  padding-top: 30px;
}

.milestones-summary-bottom > span:not(.summary-divider) {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.07em;
}

.milestones-summary-bottom strong {
  font-size: 0.8rem;
  font-weight: 700;
  text-align: right;
}

.summary-divider {
  grid-column: 1 / -1;
  height: 1px;
  margin-block: 3px;
  background: var(--color-border);
}

/* Archive */

.milestone-archive {
  padding-block: var(--section-space);
}

.milestone-archive-heading {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(220px, 0.62fr);
  align-items: end;
  gap: clamp(28px, 6vw, 80px);
}

.milestone-archive-heading h2 {
  max-width: 780px;
}

.milestone-archive-note {
  max-width: 370px;
  font-size: 0.95rem;
}

.milestone-year-nav {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
  margin-top: clamp(34px, 5vw, 54px);
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, 0.52);
}

.year-nav-label {
  margin-right: 8px;
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.67rem;
  letter-spacing: 0.07em;
}

/* Timeline */

.milestone-timeline {
  position: relative;
  margin-top: clamp(50px, 7vw, 82px);
}

.milestone-timeline::before {
  position: absolute;
  top: 7px;
  bottom: 0;
  left: 118px;
  width: 1px;
  background: var(--color-border);
  content: "";
}

.milestone-year {
  position: relative;
  display: grid;
  grid-template-columns: 118px minmax(0, 1fr);
  align-items: start;
  column-gap: clamp(24px, 4vw, 52px);
  scroll-margin-top: 110px;
}

.milestone-year + .milestone-year {
  margin-top: clamp(52px, 8vw, 94px);
}

.milestone-year-marker {
  position: sticky;
  top: 110px;
  display: flex;
  grid-column: 1;
  grid-row: 1;
  flex-direction: column;
  align-items: flex-start;
  padding-top: 2px;
}

.milestone-year-dot {
  position: absolute;
  top: 6px;
  right: -31px;
  z-index: 1;
  width: 9px;
  height: 9px;
  border: 2px solid var(--color-bg);
  border-radius: 50%;
  background: var(--color-accent);
  box-shadow: 0 0 0 1px var(--color-border-strong);
}

.milestone-year-marker h3 {
  font-size: 1.5rem;
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.06em;
}

.milestone-year-caption {
  max-width: 100px;
  margin-top: 10px;
  color: var(--color-muted);
  font-size: 0.72rem;
  line-height: 1.5;
}

/* Jumping to a year highlights its heading */
.milestone-year:target .milestone-year-marker h3 {
  margin-inline: -3px;
  padding-inline: 3px;
  background: linear-gradient(transparent 62%, rgba(184, 243, 107, 0.75) 62%);
}

/* Every card sits in the second column, whatever the year holds */
.milestone-year > .milestone-card {
  grid-column: 2;
  width: 100%;
  min-width: 0;
}

.milestone-year > .milestone-card:first-of-type {
  grid-row: 1;
}

.milestone-card {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr) 44px;
  gap: clamp(18px, 3vw, 34px);
  padding: clamp(22px, 3vw, 34px);
}

.milestone-card + .milestone-card {
  margin-top: 16px;
}

.milestone-card-featured {
  background: radial-gradient(
      circle at 100% 0%,
      rgba(184, 243, 107, 0.16),
      transparent 35%
    ),
    rgba(255, 255, 255, 0.76);
}

.milestone-card-featured .milestone-card-symbol,
.milestone-card-paid .milestone-card-symbol {
  border-color: var(--color-accent-line);
  background: rgba(184, 243, 107, 0.24);
}

.milestone-card-index {
  color: var(--color-subtle);
  font-family: var(--font-mono);
  font-size: 1.2rem;
  letter-spacing: -0.04em;
  transition: color var(--transition-fast);
}

.milestone-card-index span {
  display: block;
  margin-top: 9px;
  color: var(--color-muted);
  font-size: 0.61rem;
  letter-spacing: 0.05em;
  line-height: 1.5;
}

.milestone-card-content {
  min-width: 0;
}

.milestone-card-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 9px;
}

.milestone-card-meta time {
  color: var(--color-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.07em;
}

.milestone-card h4 {
  margin-top: 17px;
  font-size: clamp(1.35rem, 2.4vw, 1.9rem);
  font-weight: 750;
  line-height: 1.15;
  letter-spacing: -0.055em;
}

.milestone-card-content > p {
  margin-top: 13px;
  font-size: 0.92rem;
  line-height: 1.8;
}

.milestone-evidence {
  margin-top: 22px;
}

@media (hover: hover) {
  .milestone-card:hover .milestone-card-index {
    color: var(--color-ink);
  }
}

/* The timeline line fills in with green as you scroll down it */
@media (prefers-reduced-motion: no-preference) {
  @supports (animation-timeline: view()) {
    .milestone-timeline {
      view-timeline: --milestone-line block;
    }

    .milestone-timeline::after {
      position: absolute;
      top: 7px;
      bottom: 0;
      left: 118px;
      width: 2px;
      margin-left: -0.5px;
      transform-origin: top;
      background: var(--color-accent-dark);
      content: "";
      pointer-events: none;
      animation: milestone-line linear both;
      animation-timeline: --milestone-line;
      animation-range: entry 0% cover 75%;
    }

    @keyframes milestone-line {
      from {
        transform: scaleY(0);
      }

      to {
        transform: scaleY(1);
      }
    }
  }
}

/* Closing panel */

.milestones-cta {
  padding-top: clamp(24px, 4vw, 48px);
  padding-bottom: clamp(84px, 11vw, 140px);
}

.milestones-cta h2 {
  max-width: 900px;
  margin-top: 20px;
}

/* Responsive */

@media (max-width: 900px) {
  .milestone-archive-heading {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .milestone-timeline::before,
  .milestone-timeline::after {
    left: 12px;
  }

  .milestone-year {
    grid-template-columns: minmax(0, 1fr);
    padding-left: 38px;
  }

  .milestone-year > .milestone-year-marker,
  .milestone-year > .milestone-card,
  .milestone-year > .milestone-card:first-of-type {
    grid-column: 1;
    grid-row: auto;
  }

  .milestone-year-marker {
    position: relative;
    top: auto;
    margin-bottom: 20px;
  }

  .milestone-year-dot {
    top: 3px;
    right: auto;
    left: -30px;
  }

  .milestone-year-caption {
    max-width: none;
  }
}

@media (max-width: 600px) {
  .milestone-year-nav {
    gap: 8px;
    padding: 12px;
  }

  .year-nav-label {
    width: 100%;
    margin: 0 0 3px;
  }

  .milestone-year {
    padding-left: 28px;
  }

  .milestone-timeline::before,
  .milestone-timeline::after {
    left: 8px;
  }

  .milestone-year-dot {
    left: -24px;
  }

  .milestone-card {
    grid-template-columns: minmax(0, 1fr) 38px;
    gap: 16px;
    padding: 21px;
  }

  .milestone-card-index {
    grid-column: 1 / -1;
    font-size: 0.95rem;
  }

  .milestone-card-index span {
    display: inline;
    margin-left: 8px;
  }

  .milestone-card-content {
    grid-column: 1;
    grid-row: 2;
  }

  .milestone-card-symbol {
    grid-column: 2;
    grid-row: 2;
    width: 38px;
    height: 38px;
    flex-basis: 38px;
    border-radius: 12px;
  }

  .milestone-card h4 {
    font-size: 1.35rem;
  }

  .milestones-cta-inner {
    padding: 26px 22px;
    border-radius: var(--radius-lg);
  }
}