/* =========================================================
   HOME — page-specific styles
   ========================================================= */

/* Scroll snap (Home only) */
html {
  overscroll-behavior-y: none;
  scroll-snap-type: y mandatory;
  scroll-behavior: smooth;
}

body {
  --brand-color: #e3e3e3;
  --brand-size: 120px;
  --nav-hover-color: #e3e3e3;
  --nav-active-color: #e3e3e3;

  background: #e3e3e3;
  overscroll-behavior-y: none;
}

/* Snap layout */
.snap-page {
  max-width: none;
  margin: 0;
  padding: 0;
}

.snap-section {
  min-height: 100svh;
  scroll-snap-align: start;
  scroll-snap-stop: always;
  padding-top: var(--header-h);
}

.snap-section--auto {
  min-height: auto;
  padding-top: 0;
}

/* =========================================================
   Section backgrounds
   ========================================================= */

.section-1 {
  background: #e3e3e3;
  --hero-accent: #e2360e;
  position: relative;
}

.section-2 {
  background: #e2360e;
}

.section-3 {
  background: #121113;
}

/* =========================================================
   SECTION 1 — Hero
   ========================================================= */

.hero {
  min-height: calc(100svh - var(--header-h));
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 14px;
  padding-block: 10px;
}

.hero-title {
  margin: 0;
  color: #121113;
  font-size: clamp(48px, 7vw, 92px);
  letter-spacing: 0.01em;
  line-height: 1.2;
  max-width: 18ch;
}

.hero-accent {
  color: var(--hero-accent);
}

.hero-subtitle {
  margin-top: 2vh;
  color: #726e75;
  font-size: clamp(14px, 2.2vw, 20px);
  line-height: 1.35;
  max-width: 72ch;
}

/* CTA — Hero */
.cta--hero {
  margin-top: 16px;
  margin-bottom: 40px;
  background: #121113;
  color: #e3e3e3;
}

@media (hover: hover) and (pointer: fine) {
  .cta--hero:hover {
    background: #c6a15b;
    color: #121113;
  }
}

.cta--hero:active,
.cta--hero:focus-visible {
  background: #121113;
  color: #c6a15b;
  transform: translateY(1px);
}

/* Decorative complement */
.hero-complement {
  display: block;
  width: 140px;
  height: 140px;
  background-color: var(--brand-color);

  -webkit-mask: url("../assets/svg/crystal.svg") no-repeat center / contain;
  mask: url("../assets/svg/crystal.svg") no-repeat center / contain;
}

/* =========================================================
   SECTION 2 — Milestones
   ========================================================= */

.milestones {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: calc(100svh - var(--header-h));
  gap: 18px;
}

.milestones-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.milestone {
  position: relative;
  overflow: hidden;
  padding: 14px 0;
  cursor: pointer;
}

.milestone-title {
  margin: 0 0 8px;
  color: #e3e3e3;
  font-size: clamp(38px, 6vw, 68px);
  letter-spacing: 0.01em;
  line-height: 1.15;
  max-width: 20ch;
}

.milestone-text {
  margin: 0;
  color: #e3e3e3;
  font-size: clamp(10px, 3vw, 18px);
  max-width: 60ch;

  max-height: 0;
  opacity: 0;
  overflow: hidden;
  transition:
    max-height 260ms ease,
    opacity 220ms ease;
}

.milestone.is-open .milestone-text {
  max-height: 200px;
  opacity: 1;
}

.highlight {
  color: #121113;
  white-space: nowrap;
}

/* Reveal mask */
.section-2 .milestone::before {
  content: "";
  position: absolute;
  inset: 0;
  background: #e2360e;
  transform-origin: left;
  transform: scaleX(1);
  z-index: 2;
  pointer-events: none;
}

.section-2 .milestone-content,
.section-2 .milestone-media {
  position: relative;
  z-index: 1;
}

body.home-s2-active .section-2 .milestone::before {
  animation: milestoneReveal 900ms cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}

body.home-s2-active .section-2 .milestone:nth-child(1)::before {
  animation-delay: 120ms;
}
body.home-s2-active .section-2 .milestone:nth-child(2)::before {
  animation-delay: 320ms;
}
body.home-s2-active .section-2 .milestone:nth-child(3)::before {
  animation-delay: 520ms;
}
body.home-s2-active .section-2 .milestone:nth-child(4)::before {
  animation-delay: 720ms;
}

@keyframes milestoneReveal {
  to {
    transform: scaleX(0);
  }
}

@media (hover: hover) and (pointer: fine) {
  .section-2 .milestone:hover .milestone-title {
    color: #121113;
  }

  .section-2 .milestone:hover .highlight {
    color: #e3e3e3;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  .section-2 .milestone::before {
    animation: none;
    transform: scaleX(0);
  }

  .milestone-text {
    transition: none;
  }
}

/* =========================================================
   SECTION 3 — Differentiator
   ========================================================= */

.differentiator {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: calc(100svh - var(--header-h));
  gap: 16px;
}

.diff-col {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.diff-title {
  margin: 0;
  color: #e2360e;
  max-width: 24ch;
  font-size: clamp(48px, 7vw, 92px);
  letter-spacing: 0.01em;
  line-height: 1.2;
}

.diff-text {
  margin: 0;
  color: #e3e3e3;
  font-size: 16px;
  line-height: 1.6;
  max-width: 62ch;
}

/* CTA — Differentiator */
.cta--diff {
  margin-top: 18px;
  background: #c6a15b;
  color: #121113;
}

@media (hover: hover) and (pointer: fine) {
  .cta--diff:hover {
    background: #e2360e;
    color: #e3e3e3;
  }
}

.cta--diff:active,
.cta--diff:focus-visible {
  background: #e3e3e3;
  color: #e2360e;
  border-color: #e2360e;
}

/* =========================================================
   RESPONSIVE
   ========================================================= */

@media (min-width: 768px) {
  .milestones-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 50px;
    max-width: 1100px;
    margin: 0 auto;
  }

  .differentiator {
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    gap: 32px;
  }

  .diff-col--left {
    padding-right: 20px;
  }
  .diff-col--right {
    padding-left: 20px;
  }

  .hero-complement {
    position: absolute;
    right: 40px;
    bottom: 20px;
    width: 120px;
    height: 120px;
    margin: 0;
  }
}

@media (max-width: 767px) {
  .section-1 {
    --hero-block-w: min(92vw, 520px);
  }

  .hero-title {
    font-size: clamp(38px, 9.5vw, 54px);
    max-width: var(--hero-block-w);
  }

  .hero-subtitle {
    max-width: var(--hero-block-w);
    font-size: clamp(16px, 4.2vw, 20px);
  }

  .cta--hero {
    width: var(--hero-block-w);
    justify-content: center;
    white-space: nowrap;
    padding-inline: 18px;
    letter-spacing: 0.1em;
    font-size: 14px;
  }

  .hero-complement {
    margin-top: auto;
    align-self: center;
    margin-bottom: 14px;
    width: 120px;
    height: 120px;
  }
}

/* =========================================================
   Microinteractions — Section 1
   ========================================================= */

.section-1 .hero-title,
.section-1 .hero-subtitle,
.section-1 .cta--hero {
  opacity: 1;
  transform: none;
}

body.home-s1-active .section-1 .hero-title,
body.home-s1-active .section-1 .hero-subtitle,
body.home-s1-active .section-1 .cta--hero {
  opacity: 0;
  transform: translateY(8px);
  animation: heroEnter 1200ms cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}

body.home-s1-active .section-1 .hero-title {
  animation-delay: 120ms;
}
body.home-s1-active .section-1 .hero-subtitle {
  animation-delay: 320ms;
}
body.home-s1-active .section-1 .cta--hero {
  animation-delay: 520ms;
}

@keyframes heroEnter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  body.home-s1-active .section-1 .hero-title,
  body.home-s1-active .section-1 .hero-subtitle,
  body.home-s1-active .section-1 .cta--hero {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

/* =========================================================
   Microinteractions — Section 3
   ========================================================= */

.section-3 .kicker,
.section-3 .diff-title,
.section-3 .diff-text,
.section-3 .cta--diff {
  opacity: 1;
  transform: none;
}

body.home-s3-active .section-3 .kicker,
body.home-s3-active .section-3 .diff-title,
body.home-s3-active .section-3 .diff-text,
body.home-s3-active .section-3 .cta--diff {
  opacity: 0;
  transform: translateY(8px);
  animation: diffEnter 1200ms cubic-bezier(0.22, 0.61, 0.36, 1) forwards;
}

body.home-s3-active .section-3 .kicker {
  animation-delay: 120ms;
}
body.home-s3-active .section-3 .diff-title {
  animation-delay: 320ms;
}
body.home-s3-active .section-3 .diff-text {
  animation-delay: 520ms;
}
body.home-s3-active .section-3 .cta--diff {
  animation-delay: 720ms;
}

@keyframes diffEnter {
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (prefers-reduced-motion: reduce) {
  body.home-s3-active .section-3 .kicker,
  body.home-s3-active .section-3 .diff-title,
  body.home-s3-active .section-3 .diff-text,
  body.home-s3-active .section-3 .cta--diff {
    animation: none;
    opacity: 1;
    transform: none;
  }
}

/* Prevent flash before IO triggers (mobile) */
@media (max-width: 767px) {
  body:not(.home-s3-active) .section-3 .kicker,
  body:not(.home-s3-active) .section-3 .diff-title,
  body:not(.home-s3-active) .section-3 .diff-text,
  body:not(.home-s3-active) .section-3 .cta--diff {
    opacity: 0;
    transform: translateY(8px);
  }
}