/* ============================================================== *
 *  evolution.css — the scroll-driven journey
 * ============================================================== */

.evolution {
  position: relative;
  --accent: #d9a05b;
  --accent-2: #f0c489;
}

/* morphing backdrop — a flat era-tinted field with a single thin horizon
   accent at the very top. No glow blobs. */
.evo-backdrop {
  position: fixed;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, var(--bg-top), var(--bg-bottom) 72%);
  transition: background 900ms var(--ease-out);
}
.evo-backdrop::before {
  content: '';
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent) 50%, transparent);
  opacity: 0.5;
  transition: background 900ms var(--ease-out);
}

/* ---- odometer ---- */
.odometer {
  position: fixed;
  top: calc(var(--topbar-h) + 14px);
  right: clamp(1rem, 3vw, 2rem);
  z-index: 40;
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.35rem;
  pointer-events: none;
}
.odometer__label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.34em;
  text-transform: uppercase;
  color: var(--accent);
  padding-right: 0.2em;
  transition: color 600ms var(--ease-out);
}
.odometer__reels {
  display: flex;
  gap: 3px;
  padding: 0.4rem 0.55rem;
  background: color-mix(in srgb, var(--ink-950) 60%, transparent);
  border: 1px solid color-mix(in srgb, var(--accent) 34%, var(--line));
  border-radius: var(--radius-sm);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  box-shadow: inset 0 0 26px -12px var(--accent);
}
.odo-reel {
  display: block;
  width: 0.66em;
  height: 1em;
  overflow: hidden;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  line-height: 1;
  color: var(--text-hi);
}
.odo-strip {
  display: flex;
  flex-direction: column;
  transition: transform 520ms var(--ease-out);
}
.odo-digit { height: 1em; line-height: 1em; text-align: center; }

/* ---- timeline rail ---- */
.rail {
  position: fixed;
  left: clamp(0.7rem, 2vw, 1.7rem);
  top: 50%;
  transform: translateY(-50%);
  z-index: 40;
}
.rail::before {
  content: '';
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: var(--line);
  border-radius: 2px;
}
.rail__fill {
  position: absolute;
  left: 5px;
  top: 8px;
  width: 2px;
  height: calc(100% - 16px);
  background: linear-gradient(var(--accent), var(--accent-2));
  border-radius: 2px;
  transform-origin: top;
  transform: scaleY(0);
  transition: transform 120ms linear, background 600ms var(--ease-out);
}
.rail__list {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  height: min(56vh, 440px);
}
.rail__dot {
  position: relative;
  padding-left: 1.5rem;
  display: flex;
  align-items: center;
  min-height: 30px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--text-lo);
  transition: color var(--t-med);
}
.rail__dot::before {
  content: '';
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid var(--line-strong);
  background: var(--ink-900);
  transition: border-color var(--t-med), background var(--t-med), box-shadow var(--t-med);
}
.rail__dot:hover { color: var(--text-mid); }
.rail__dot.is-active { color: var(--text-hi); }
.rail__dot.is-active::before {
  border-color: var(--accent);
  background: var(--accent);
  box-shadow: 0 0 0 5px color-mix(in srgb, var(--accent) 22%, transparent);
}
.rail__year { white-space: nowrap; }

/* ---- hero ---- */
.evo-hero {
  position: relative;
  z-index: 2;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  padding: clamp(5rem, 12vh, 8rem) clamp(1.4rem, 6vw, 5.5rem) 5rem;
}
.evo-hero__kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.32em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.1rem;
}
.evo-hero__title {
  font-size: clamp(3.2rem, 13vw, 9.5rem);
  line-height: 0.88;
  color: var(--text-hi);
}
.evo-hero__lede {
  margin-top: 1.6rem;
  max-width: 50ch;
  font-size: clamp(1.05rem, 1.6vw, 1.3rem);
  color: var(--text-mid);
}
.evo-hero__car {
  width: clamp(220px, 42vw, 540px);
  margin-top: clamp(1.5rem, 4vw, 3rem);
  animation: drive-in 1.5s var(--ease-out) both;
}
.evo-hero__road {
  width: clamp(240px, 46vw, 600px);
  height: 2px;
  margin-top: 0.2rem;
  background: linear-gradient(90deg, var(--accent), transparent);
  opacity: 0.6;
}
.scroll-cue {
  position: absolute;
  left: 50%;
  bottom: 1.8rem;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--text-lo);
}
.scroll-cue__dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent);
  animation: cue-bounce 1.6s var(--ease-in-out) infinite;
}

.evo-tick {
  position: relative;
  z-index: 2;
  width: min(100% - 3rem, var(--maxw));
  margin: 0 auto;
}

/* ---- era sections ---- */
.era {
  position: relative;
  z-index: 2;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  padding: clamp(4rem, 9vh, 7rem) clamp(1.4rem, 6vw, 5.5rem);
}
.era__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1.04fr 0.96fr;
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: center;
}
.era:nth-child(even) .era__text { order: 2; }
.era:nth-child(even) .era__visual { order: 1; }

.era__index {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1.2rem;
}
.era__index::before {
  content: '';
  width: 36px;
  height: 1px;
  background: var(--accent);
  opacity: 0.7;
}
.era__kicker {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-mid);
  margin-bottom: 0.7rem;
}
.era__title {
  font-size: clamp(2.4rem, 6vw, 4.4rem);
  color: var(--text-hi);
}
.era__lede {
  margin-top: 0.9rem;
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 500;
  font-size: clamp(1.25rem, 2.2vw, 1.75rem);
  line-height: 1.18;
  color: color-mix(in srgb, var(--accent-2) 72%, var(--paper));
}
.era__narrative {
  margin-top: 1.1rem;
  max-width: 52ch;
  color: var(--text-mid);
}
.era__stats {
  margin-top: 1.8rem;
  padding-top: 1.6rem;
  border-top: 1px solid var(--line);
  display: flex;
  flex-wrap: wrap;
  gap: clamp(1.4rem, 4vw, 3rem);
}
.era__also { margin-top: 1.6rem; }
.era__also-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-lo);
  margin-bottom: 0.7rem;
}
.era__also-list { display: flex; flex-wrap: wrap; gap: 0.5rem; }
.era__also-list li {
  padding: 0.4rem 0.78rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--text-mid);
  background: var(--surface);
}
.era__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: 1.8rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--accent);
  border-bottom: 1px solid color-mix(in srgb, var(--accent) 40%, transparent);
  padding-bottom: 0.2rem;
  transition: color var(--t-fast), border-color var(--t-fast);
}
.era__link svg { width: 16px; height: 16px; transition: transform var(--t-med) var(--ease-out); }
.era__link:hover { color: var(--accent-2); border-color: var(--accent-2); }
.era__link:hover svg { transform: translateX(4px); }

/* visual stage */
.era__visual {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: 52vh;
  overflow: hidden;
}
.era__bignum {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-style: italic;
  font-size: clamp(6rem, 18vw, 15rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: transparent;
  -webkit-text-stroke: 1px color-mix(in srgb, var(--accent) 26%, transparent);
  z-index: 0;
  pointer-events: none;
  user-select: none;
  white-space: nowrap;
}
/* framed exhibit print — clean, technical, no tilt */
.era__frame {
  position: relative;
  z-index: 1;
  display: block;
  width: min(100%, 500px);
  padding: 11px;
  text-align: left;
  cursor: pointer;
  background: color-mix(in srgb, var(--ink-950) 55%, transparent);
  border: 1px solid var(--line-strong);
  border-radius: 3px;
  box-shadow: 0 44px 90px -40px rgba(0, 0, 0, 0.92);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  transition: transform var(--t-med) var(--ease-out), border-color var(--t-med);
}
.era__frame:hover,
.era__frame:focus-visible {
  transform: translateY(-4px);
  border-color: color-mix(in srgb, var(--accent) 55%, var(--line-strong));
}
.era__photo {
  aspect-ratio: 4 / 3;
  overflow: hidden;
  background: var(--ink-800);
}
.era__photo .media { width: 100%; height: 100%; }
.era__photo .media__img { transition: transform var(--t-slow) var(--ease-out); }
.era__frame:hover .media__img { transform: scale(1.05); }
.era__plate {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 11px;
  padding-top: 0.6rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
}
.era__plate-name { font-size: 0.8rem; letter-spacing: 0.06em; text-transform: uppercase; color: var(--text-hi); }
.era__plate-meta { display: inline-flex; align-items: center; gap: 0.55rem; }
.era__plate-yr { font-size: 0.8rem; color: var(--accent); }
.era__plate-arrow { width: 15px; height: 15px; color: var(--accent); transition: transform var(--t-med) var(--ease-out); }
.era__frame:hover .era__plate-arrow,
.era__frame:focus-visible .era__plate-arrow { transform: translate(3px, -3px); }

/* milestone timeline — the deeper history of each era */
.era__milestones { margin-top: 1.8rem; }
.era__milestones-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-lo);
  margin-bottom: 1rem;
}
.era__milestones-list {
  display: flex;
  flex-direction: column;
  margin-left: 4px;
  border-left: 1px solid var(--line);
}
.era__milestones-list li {
  position: relative;
  display: grid;
  grid-template-columns: 4.2rem 1fr;
  gap: 0.8rem;
  padding: 0.45rem 0 0.45rem 1.1rem;
}
.era__milestones-list li::before {
  content: '';
  position: absolute;
  left: -4px;
  top: 0.85rem;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}
.era__ms-year { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent); }
.era__ms-text { color: var(--text-mid); font-size: 0.92rem; line-height: 1.4; }

/* ---- outro ---- */
.evo-outro {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 0.8rem;
  padding: clamp(5rem, 14vh, 9rem) 1.4rem clamp(4rem, 10vh, 7rem);
}
.evo-outro__kicker {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--accent);
}
.evo-outro__title { font-size: clamp(2rem, 6vw, 3.6rem); color: var(--text-hi); }
.evo-outro__text { max-width: 48ch; color: var(--text-mid); }
.evo-outro .btn { margin-top: 1.2rem; }

/* ---- responsive ---- */
/* On desktop, keep hero + era copy clear of the fixed timeline rail (incl. its
   year labels) so they never overlap. */
@media (min-width: 961px) {
  .evo-hero { padding-left: max(clamp(1.4rem, 6vw, 5.5rem), 9.5rem); }
  .era { padding-left: max(clamp(1.4rem, 6vw, 5.5rem), 9.5rem); }
}
@media (max-width: 960px) {
  /* compact dots-only era nav on the left edge (replaces the labelled rail) */
  .rail { left: 6px; }
  .rail::before, .rail__fill { left: 5px; }
  .rail__year { display: none; }
  .rail__dot { width: 34px; padding-left: 1.1rem; min-height: 40px; }
  .rail__list { height: min(58vh, 460px); }
  .evo-hero, .era { padding-left: 2.9rem; padding-right: 1.4rem; }
  .era__inner { grid-template-columns: 1fr; gap: 2.4rem; }
  .era:nth-child(even) .era__text { order: 1; }
  .era:nth-child(even) .era__visual { order: 2; }
  .era__visual { min-height: 44vh; }
  .odometer {
    top: auto;
    bottom: max(1rem, env(safe-area-inset-bottom));
    right: max(1rem, env(safe-area-inset-right));
  }
}
@media (max-width: 540px) {
  .era__photo { width: min(100%, 360px); }
  .era__stats { gap: 1.4rem 2rem; }
}