.page-about {
  --about-veil: rgba(15, 26, 46, 0.72);
  --about-line: rgba(212, 255, 63, 0.28);
  --about-flare-line: rgba(255, 81, 47, 0.5);
  background:
    radial-gradient(circle at 15% 20%, rgba(15, 26, 46, 0.6), transparent 45%),
    radial-gradient(circle at 85% 75%, rgba(212, 255, 63, 0.04), transparent 35%),
    var(--void);
  color: var(--daylight);
  font-family: var(--font-body);
}

.page-about .crumb {
  padding: var(--space-5) var(--space-5) 0;
  position: relative;
  z-index: 1;
}

.page-about h2 {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.01em;
  margin: var(--space-2) 0 var(--space-4);
}

.page-about .field {
  max-width: 1200px;
}

/* ===== Hero ===== */
.page-about .about-hero {
  display: grid;
  gap: var(--space-6);
  padding: var(--space-6) var(--space-5) var(--space-7);
  position: relative;
  overflow: hidden;
  background:
    linear-gradient(135deg, var(--about-veil), transparent 55%),
    linear-gradient(20deg, transparent 70%, rgba(255, 81, 47, 0.08) 100%);
  border-bottom: 1px solid var(--latent);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 160px;
  height: 160px;
  background: repeating-linear-gradient(
    -45deg,
    transparent 0 7px,
    rgba(255, 81, 47, 0.1) 7px 9px
  );
  pointer-events: none;
}

.page-about .about-hero-index {
  position: relative;
  background: var(--glass);
  border: 1px solid var(--latent);
  border-left: 3px solid var(--volt);
  border-radius: var(--radius);
  padding: var(--space-5);
}

.page-about .about-index {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-about .about-index-item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding-bottom: var(--space-3);
  border-bottom: 1px dashed var(--latent);
}

.page-about .about-index-item dt {
  font-size: 13px;
  color: var(--dimmer);
}

.page-about .about-index-item dd {
  margin: 0;
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
}

.page-about .about-hero-note {
  margin: var(--space-4) 0 0;
  padding-top: var(--space-4);
  border-top: 1px solid var(--latent);
  font-size: 13px;
  line-height: 1.7;
  color: var(--dimmer);
}

.page-about .about-hero-main {
  position: relative;
}

.page-about .about-hero-main .eyebrow {
  margin-bottom: var(--space-2);
}

.page-about .about-hero-main h1 {
  font-family: var(--font-display);
  font-size: clamp(34px, 6vw, 56px);
  font-weight: 700;
  line-height: 0.95;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 0 0 var(--space-4);
}

.page-about .about-hero-main .lead {
  max-width: 640px;
  margin-bottom: var(--space-5);
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero-main .media-frame--hero {
  position: relative;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius);
  border: 1px solid var(--latent);
  background: var(--abyss);
}

.page-about .about-hero-main .media-frame--hero img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

/* ===== Mission ===== */
.page-about .about-mission {
  padding: var(--space-7) 0;
  border-bottom: 1px solid var(--latent);
}

.page-about .about-mission-grid {
  display: grid;
  gap: var(--space-6);
}

.page-about .about-mission-note {
  position: relative;
  padding: var(--space-5);
  background:
    linear-gradient(135deg, rgba(255, 255, 255, 0.05), transparent),
    rgba(15, 26, 46, 0.4);
  border: 1px solid var(--latent);
  border-radius: var(--radius);
}

.page-about .about-quote {
  font-family: Georgia, "Times New Roman", serif;
  font-size: 24px;
  font-style: italic;
  line-height: 1.4;
  color: var(--daylight);
  border-left: 3px solid var(--volt);
  padding-left: var(--space-4);
  margin: var(--space-5) 0;
}

.page-about .about-mission-caption {
  font-size: 13px;
  color: var(--dimmer);
  line-height: 1.6;
}

.page-about .about-mission-body p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--dimmer);
  margin-bottom: var(--space-4);
}

.page-about .about-mission-body .btn {
  margin-top: var(--space-3);
}

/* ===== Timeline ===== */
.page-about .about-timeline {
  padding: var(--space-7) 0;
  background:
    linear-gradient(180deg, rgba(15, 26, 46, 0.8), transparent 60%),
    var(--void);
  border-bottom: 1px solid var(--latent);
}

.page-about .about-timeline-list {
  list-style: none;
  margin: var(--space-6) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-5);
}

.page-about .about-timeline-item {
  position: relative;
  padding-left: 28px;
}

.page-about .about-timeline-dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--flare);
  box-shadow:
    0 0 0 4px rgba(255, 81, 47, 0.15),
    0 0 16px rgba(255, 81, 47, 0.35);
}

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 22px;
  bottom: -22px;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--about-flare-line),
    var(--about-line)
  );
}

.page-about .about-timeline-item:last-child::before {
  display: none;
}

.page-about .about-timeline-year {
  display: block;
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  line-height: 1;
  color: var(--daylight);
  margin-bottom: var(--space-2);
}

.page-about .about-timeline-text {
  font-size: 14px;
  line-height: 1.7;
  color: var(--dimmer);
  margin: 0;
}

.page-about .about-timeline-more {
  margin-top: var(--space-5);
  font-size: 14px;
  color: var(--dimmer);
}

.page-about .about-timeline-more a {
  color: var(--volt);
  text-decoration: none;
}

/* ===== Stats ===== */
.page-about .about-stats {
  padding: var(--space-7) 0;
  border-bottom: 1px solid var(--latent);
}

.page-about .about-stats-grid {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.page-about .about-stats-data {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  align-content: start;
}

.page-about .about-stat-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  background: var(--glass);
  border: 1px solid var(--latent);
  border-radius: var(--radius);
  padding: var(--space-5);
  transition:
    transform 0.22s ease,
    background-color 0.22s ease,
    border-color 0.22s ease;
}

.page-about .about-stat-card:nth-child(2n) {
  transform: translateY(6px);
}

.page-about .about-stat-card:hover {
  transform: translateY(-3px) rotate(-1deg);
  background: rgba(255, 255, 255, 0.09);
  border-color: rgba(212, 255, 63, 0.4);
}

.page-about .stat-num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--volt);
}

.page-about .about-stat-card:nth-child(2) .stat-num,
.page-about .about-stat-card:nth-child(3) .stat-num {
  color: var(--flare);
}

.page-about .stat-label {
  font-size: 13px;
  color: var(--dimmer);
}

.page-about .about-stats-copy p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--dimmer);
  margin-bottom: var(--space-4);
}

.page-about .about-stats-chart {
  margin-top: var(--space-5);
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--latent);
  background: var(--abyss);
}

/* ===== Ecosystem ===== */
.page-about .about-ecosystem {
  padding: var(--space-7) 0;
  background:
    radial-gradient(circle at 80% 30%, rgba(15, 26, 46, 0.66), transparent 45%),
    linear-gradient(135deg, rgba(255, 255, 255, 0.02), transparent 50%),
    var(--void);
}

.page-about .about-ecosystem-grid {
  display: grid;
  gap: var(--space-6);
  margin-top: var(--space-4);
}

.page-about .about-ecosystem-copy p {
  font-size: 15px;
  line-height: 1.8;
  color: var(--dimmer);
  margin-bottom: var(--space-4);
}

.page-about .about-eco-list {
  list-style: none;
  margin: var(--space-5) 0;
  padding: 0;
  display: grid;
  gap: var(--space-4);
}

.page-about .about-eco-list li {
  padding: var(--space-4) var(--space-5);
  background: var(--glass);
  border-left: 3px solid var(--volt);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: background-color 0.2s ease;
}

.page-about .about-eco-list li:hover {
  background: rgba(255, 255, 255, 0.09);
}

.page-about .about-eco-list li:nth-child(2) {
  border-left-color: var(--flare);
}

.page-about .about-eco-list li:nth-child(3) {
  border-left-color: var(--dimmer);
}

.page-about .about-eco-list strong {
  display: block;
  font-family: var(--font-display);
  font-size: 16px;
  color: var(--daylight);
  margin-bottom: var(--space-2);
  letter-spacing: 0.02em;
}

.page-about .about-eco-list span {
  font-size: 14px;
  line-height: 1.7;
  color: var(--dimmer);
}

.page-about .about-icp-note {
  font-size: 13px;
  color: var(--dimmer);
}

.page-about .about-icp-note a {
  color: var(--volt);
  text-decoration: none;
}

.page-about .about-ecosystem-media {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.page-about .about-ecosystem-media .media-frame {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--latent);
  background: var(--abyss);
}

.page-about .about-ecosystem-caption {
  font-size: 13px;
  color: var(--dimmer);
  line-height: 1.6;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .crumb {
    padding: var(--space-6) var(--space-6) 0;
  }

  .page-about .about-hero {
    grid-template-columns: 280px 1fr;
    gap: var(--space-7);
    padding: var(--space-7) var(--space-6) var(--space-8);
  }

  .page-about .about-index {
    grid-template-columns: 1fr;
  }

  .page-about .about-hero-main h1 {
    font-size: 48px;
  }

  .page-about .about-hero-main .media-frame--hero {
    aspect-ratio: 16 / 6;
  }

  .page-about .about-mission,
  .page-about .about-timeline,
  .page-about .about-stats,
  .page-about .about-ecosystem {
    padding: var(--space-8) 0;
  }

  .page-about .about-mission-grid,
  .page-about .about-ecosystem-grid {
    grid-template-columns: 300px 1fr;
    gap: var(--space-7);
  }

  .page-about .about-stats-grid {
    grid-template-columns: 1fr 1.4fr;
    gap: var(--space-7);
  }

  .page-about .about-stats-data {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-timeline-list {
    max-height: 660px;
    overflow-y: auto;
    scroll-snap-type: y proximity;
    padding-right: var(--space-5);
    scrollbar-width: thin;
    scrollbar-color: var(--flare) var(--abyss);
  }

  .page-about .about-timeline-list::-webkit-scrollbar {
    width: 6px;
  }

  .page-about .about-timeline-list::-webkit-scrollbar-track {
    background: var(--abyss);
  }

  .page-about .about-timeline-list::-webkit-scrollbar-thumb {
    background: var(--flare);
    border-radius: 3px;
  }

  .page-about .about-timeline-item {
    scroll-snap-align: start;
    padding-bottom: var(--space-5);
    border-bottom: 1px solid var(--latent);
  }

  .page-about .about-timeline-item:last-child {
    border-bottom: none;
  }

  .page-about .about-timeline-year {
    font-size: 32px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    grid-template-columns: 320px 1fr;
    gap: var(--space-8);
    padding: var(--space-8) var(--space-7);
  }

  .page-about .about-index {
    gap: var(--space-4);
  }

  .page-about .about-index-item dd {
    font-size: 36px;
  }

  .page-about .about-hero-main h1 {
    font-size: 56px;
  }

  .page-about .about-mission-grid,
  .page-about .about-ecosystem-grid {
    grid-template-columns: 340px 1fr;
    gap: var(--space-8);
  }

  .page-about .about-stats-grid {
    grid-template-columns: 420px 1fr;
  }
}