/* ========== About Us — 环球青旅 ========== */
.about-page {
  --about-ink: #1f2a2e;
  --about-muted: #5a6569;
  --about-sand: #f7f3ee;
  --about-mist: #eef2f1;
  --about-line: rgba(41, 52, 57, 0.12);
}

/* ----- Hero ----- */
.about-hero {
  position: relative;
  min-height: min(78vh, 640px);
  display: flex;
  align-items: flex-end;
  color: #fff;
  overflow: hidden;
}

.about-hero-media {
  position: absolute;
  inset: 0;
}

.about-hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform: scale(1.04);
  animation: about-hero- ken 18s ease-out forwards;
}

.about-hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(20, 28, 32, 0.25) 0%, rgba(20, 28, 32, 0.55) 48%, rgba(20, 28, 32, 0.78) 100%),
    linear-gradient(90deg, rgba(20, 28, 32, 0.35) 0%, transparent 55%);
  pointer-events: none;
}

.about-hero-inner {
  position: relative;
  z-index: 1;
  padding: 72px 16px 64px;
  max-width: 920px;
}

.about-hero-brand {
  margin: 0;
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.15;
  text-shadow: 0 2px 18px rgba(0, 0, 0, 0.35);
}

.about-hero-brand-en {
  margin: 6px 0 22px;
  font-size: 0.95rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  opacity: 0.92;
  font-weight: 500;
}

.about-hero-title {
  margin: 0 0 14px;
  font-size: clamp(1.35rem, 2.8vw, 1.85rem);
  font-weight: 600;
  line-height: 1.45;
  max-width: 18em;
  text-shadow: 0 1px 10px rgba(0, 0, 0, 0.35);
}

.about-hero-sub {
  margin: 0 0 28px;
  font-size: 1rem;
  opacity: 0.9;
  letter-spacing: 0.06em;
}

.about-hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.about-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: var(--radius-btn, 6px);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease, transform 0.25s ease;
}

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

.about-btn-primary {
  background: var(--color-primary-nav, #f78600);
  color: #fff;
  border: 1px solid transparent;
}

.about-btn-primary:hover {
  background: var(--color-primary-hover, #fb9d42);
  color: #fff;
}

.about-btn-ghost {
  background: transparent;
  color: #fff;
  border: 1px solid rgba(255, 255, 255, 0.75);
}

.about-btn-ghost:hover {
  background: rgba(255, 255, 255, 0.12);
  color: #fff;
}

.about-btn-outline {
  background: #fff;
  color: var(--color-primary-nav, #f78600);
  border: 1px solid var(--color-primary-nav, #f78600);
}

.about-btn-outline:hover {
  background: var(--color-primary-nav, #f78600);
  color: #fff;
}

@keyframes about-hero-ken {
  from { transform: scale(1.08); }
  to { transform: scale(1); }
}

/* ----- Shared ----- */
.about-eyebrow {
  margin: 0 0 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-primary-nav, #f78600);
}

.about-sec-head {
  text-align: center;
  max-width: 640px;
  margin: 0 auto 40px;
}

.about-sec-head h2 {
  margin: 0 0 10px;
  font-size: clamp(1.45rem, 2.5vw, 1.85rem);
  color: var(--about-ink);
  line-height: 1.35;
}

.about-sec-sub {
  margin: 0;
  color: var(--about-muted);
  font-size: 15px;
  line-height: 1.7;
}

/* ----- Story ----- */
.about-story {
  padding: 72px 0 40px;
  background: #fff;
}

.about-story-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 40px 48px;
  align-items: center;
  margin-bottom: 48px;
}

.about-story-copy h2 {
  margin: 0 0 18px;
  font-size: clamp(1.4rem, 2.4vw, 1.75rem);
  color: var(--about-ink);
  line-height: 1.4;
}

.about-story-copy p {
  margin: 0 0 14px;
  color: var(--about-muted);
  font-size: 15px;
  line-height: 1.85;
}

.about-story-figure {
  margin: 0;
  position: relative;
}

.about-story-figure img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.about-story-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  color: var(--about-muted);
  line-height: 1.5;
}

.about-story-blocks {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  padding-top: 8px;
  border-top: 1px solid var(--about-line);
}

.about-block {
  padding: 24px 8px 8px 0;
}

.about-block h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--about-ink);
}

.about-block p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ----- Gallery ----- */
.about-gallery {
  padding: 64px 0 72px;
  background: var(--about-sand);
  scroll-margin-top: 80px;
}

.about-masonry {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  grid-auto-rows: minmax(160px, auto);
  gap: 14px;
}

.about-gal-item {
  margin: 0;
  position: relative;
  overflow: hidden;
  background: #d9d4ce;
  grid-column: span 1;
}

.about-gal-item img {
  width: 100%;
  height: 100%;
  min-height: 200px;
  object-fit: cover;
  display: block;
  transition: transform 0.55s ease;
}

.about-gal-item:hover img {
  transform: scale(1.05);
}

.about-gal-item figcaption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 28px 14px 12px;
  font-size: 13px;
  color: #fff;
  background: linear-gradient(transparent, rgba(20, 28, 32, 0.72));
  line-height: 1.4;
  opacity: 0.95;
  transition: opacity 0.3s ease;
}

.about-gal-lg {
  grid-column: span 2;
  grid-row: span 2;
}

.about-gal-lg img {
  min-height: 100%;
}

.about-gal-wide {
  grid-column: span 2;
}

/* ----- Why ----- */
.about-why {
  padding: 72px 0;
  background: #fff;
}

.about-why-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px 24px;
}

.about-why-item {
  padding: 8px 4px 0;
  border-top: 2px solid var(--color-primary-nav, #f78600);
}

.about-why-num {
  display: block;
  margin: 14px 0 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--color-primary-nav, #f78600);
}

.about-why-item h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--about-ink);
}

.about-why-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-muted);
}

/* ----- Soft CTA ----- */
.about-cta {
  padding: 64px 0 80px;
  background:
    linear-gradient(135deg, rgba(249, 133, 22, 0.08), rgba(41, 52, 57, 0.04)),
    var(--about-mist);
  text-align: center;
}

.about-cta-inner {
  max-width: 640px;
}

.about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(1.4rem, 2.4vw, 1.75rem);
  color: var(--about-ink);
}

.about-cta p {
  margin: 0 0 28px;
  color: var(--about-muted);
  font-size: 15px;
  line-height: 1.75;
}

.about-cta .about-hero-cta {
  justify-content: center;
}

/* ----- Reveal motion ----- */
.reveal {
  opacity: 0;
  transform: translateY(22px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ----- Responsive ----- */
@media (max-width: 991px) {
  .about-story-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .about-story-blocks {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .about-block {
    padding: 20px 0;
    border-bottom: 1px solid var(--about-line);
  }

  .about-block:last-child {
    border-bottom: 0;
  }

  .about-masonry {
    grid-template-columns: repeat(2, 1fr);
  }

  .about-why-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 767px) {
  .about-hero {
    min-height: min(70vh, 520px);
    align-items: center;
  }

  .about-hero-inner {
    padding: 56px 16px 48px;
  }

  .about-story {
    padding: 48px 0 24px;
  }

  .about-gallery {
    padding: 48px 0 56px;
  }

  .about-masonry {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .about-gal-lg,
  .about-gal-wide {
    grid-column: span 1;
    grid-row: span 1;
  }

  .about-gal-item img {
    min-height: 220px;
    aspect-ratio: 16 / 10;
  }

  .about-why {
    padding: 48px 0;
  }

  .about-why-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }

  .about-cta {
    padding: 48px 0 64px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-hero-media img {
    animation: none;
    transform: none;
  }

  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .about-gal-item img,
  .about-btn {
    transition: none;
  }
}