/* ===== 页面专属：page-about 品牌故事 ===== */
.page-about {
  --about-scan: rgba(255, 255, 255, 0.028);
  --about-gold-glow: 0 0 14px rgba(212, 175, 55, 0.45);
  position: relative;
  background:
    repeating-linear-gradient(
      135deg,
      rgba(10, 31, 68, 0.58) 0,
      rgba(10, 31, 68, 0.58) 14px,
      rgba(0, 0, 0, 0.72) 14px,
      rgba(0, 0, 0, 0.72) 28px
    );
  color: var(--color-ivory);
}

.page-about .site-breadcrumb {
  padding-top: var(--space-3);
  font-size: 0.9rem;
}

/* ===== Hero 区块 ===== */
.about-hero {
  position: relative;
  margin: var(--space-3) 0 var(--space-5);
  border: var(--border-heavy);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
  background: linear-gradient(135deg, var(--color-blue) 0%, var(--color-black) 82%);
  overflow: hidden;
}

.about-hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    180deg,
    transparent 0,
    transparent 4px,
    var(--about-scan) 4px,
    var(--about-scan) 5px
  );
  pointer-events: none;
}

.about-hero__grid {
  position: relative;
  display: grid;
  gap: var(--space-4);
  padding: var(--space-4) var(--space-3);
}

.about-hero__content {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--space-3);
  min-width: 0;
}

.about-hero__kicker {
  color: var(--color-gold-light);
}

.about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(1.85rem, 5vw, 3.3rem);
  line-height: 1.12;
  color: var(--color-white);
  letter-spacing: 0.02em;
  margin: 0;
  max-width: 16em;
}

.about-hero__lead {
  font-family: var(--font-body);
  font-size: 1.02rem;
  line-height: 1.85;
  color: var(--color-mist);
  max-width: 46em;
  margin: 0;
}

.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
}

.about-hero .site-badge {
  animation: page-about-glow 3.6s ease-in-out infinite;
}

.about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-2);
  width: 100%;
  max-width: 600px;
  margin: var(--space-2) 0 0;
  padding: 0;
  list-style: none;
}

.about-hero__stats div {
  border-left: 2px solid var(--color-gold);
  background: rgba(0, 0, 0, 0.35);
  border-radius: 0 var(--radius) var(--radius) 0;
  padding: 0.3rem 0 0.3rem var(--space-2);
}

.about-hero__stats dt {
  font-size: 0.72rem;
  color: var(--color-mist);
  letter-spacing: 0.07em;
}

.about-hero__stats dd {
  margin: 0.15rem 0 0;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-gold-light);
}

.about-hero__visual {
  position: relative;
  display: none;
}

.about-hero__typo {
  position: absolute;
  z-index: 0;
  pointer-events: none;
  font-family: var(--font-heading);
  font-size: 8.5rem;
  line-height: 1;
  color: rgba(212, 175, 55, 0.13);
  right: 4px;
  top: -32px;
  text-shadow: 0 0 30px rgba(212, 175, 55, 0.35);
}

.about-hero__svg {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  max-width: 240px;
  height: auto;
  background: var(--color-black);
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-radius: var(--radius);
  box-shadow: var(--shadow-hard);
}

.about-hero__vertical {
  position: absolute;
  z-index: 2;
  right: -34px;
  top: 50%;
  transform: translateY(-50%);
  writing-mode: vertical-rl;
  font-family: var(--font-heading);
  font-size: 0.78rem;
  letter-spacing: 0.34em;
  color: var(--color-gold);
  background: rgba(0, 0, 0, 0.6);
  border-radius: var(--radius);
  padding: 0.6em 0.42em;
}

/* ===== 主布局 ===== */
.about-layout {
  display: grid;
  gap: var(--space-4);
  padding-bottom: var(--space-5);
}

/* ===== 目录 ===== */
.about-toc__nav {
  position: sticky;
  top: 110px;
  display: flex;
  flex-wrap: nowrap;
  overflow-x: auto;
  gap: var(--space-1) var(--space-2);
  padding: var(--space-3);
  border-left: 3px solid var(--color-gold);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(180deg, rgba(10, 31, 68, 0.85), rgba(0, 0, 0, 0.72));
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.6);
}

.about-toc__title {
  width: 100%;
  margin: 0;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  letter-spacing: 0.14em;
  color: var(--color-gold-light);
  white-space: nowrap;
}

.about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.3rem 0.2rem;
  font-size: 0.95rem;
  color: var(--color-mist);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s, border-color 0.2s;
  white-space: nowrap;
}

.about-toc__link:hover {
  color: var(--color-white);
  border-color: var(--color-gold);
}

.about-toc__num {
  font-family: var(--font-heading);
  color: var(--color-gold);
  font-size: 0.85rem;
  min-width: 1.6em;
}

/* ===== 章节通用 ===== */
.about-section {
  position: relative;
  scroll-margin-top: 130px;
  margin-bottom: var(--space-4);
  padding: var(--space-4) var(--space-3);
  border-radius: var(--radius);
  border: 1px solid rgba(212, 175, 55, 0.22);
  overflow: hidden;
}

.about-section::after {
  content: '';
  position: absolute;
  top: 0;
  left: var(--space-3);
  right: var(--space-3);
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold), rgba(212, 175, 55, 0.12) 65%, transparent);
  border-radius: 0 0 4px 4px;
}

.about-section--origin,
.about-section--tuesday,
.about-section--future {
  background: linear-gradient(135deg, rgba(10, 31, 68, 0.88), rgba(0, 0, 0, 0.82));
}

.about-section--milestones,
.about-section--security {
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.86), rgba(10, 31, 68, 0.8));
}

.about-section__titlebar {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
}

.about-section__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.2rem;
  padding: 0.42rem 0.3rem;
  font-family: var(--font-heading);
  font-size: 1.8rem;
  line-height: 1;
  color: var(--color-gold-light);
  background: var(--color-black);
  border: 2px solid var(--color-gold);
  border-radius: 0.85rem;
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.7);
}

.about-section__heading .site-kicker {
  margin-bottom: 0.2rem;
  font-size: 0.78rem;
}

.about-section__heading h2 {
  margin: 0;
  font-family: var(--font-heading);
  font-size: clamp(1.35rem, 2.8vw, 2.05rem);
  line-height: 1.2;
  color: var(--color-white);
}

.about-section__body {
  position: relative;
  z-index: 1;
  color: var(--color-mist);
  font-size: 1rem;
  line-height: 1.85;
}

.about-section__body p {
  margin: 0 0 var(--space-3);
}

.about-section__body p:last-child {
  margin-bottom: 0;
}

.about-link {
  color: var(--color-gold-light);
  font-weight: bold;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-color: rgba(212, 175, 55, 0.5);
  transition: color 0.2s;
}

.about-link:hover {
  color: var(--color-white);
}

/* ===== 图⽚ ===== */
.about-figure {
  position: relative;
  z-index: 1;
  margin: var(--space-4) 0;
  background: var(--color-black);
  border: 3px solid var(--color-gold);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.7);
}

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

.about-figure--wide img {
  aspect-ratio: 800 / 360;
}

.about-figure--square img {
  aspect-ratio: 1 / 1;
}

.about-figure figcaption {
  padding: 0.7rem var(--space-2);
  border-top: 1px solid rgba(212, 175, 55, 0.45);
  font-size: 0.85rem;
  color: var(--color-ivory);
}

/* ===== 时间线 ===== */
.about-timeline {
  position: relative;
  z-index: 1;
  margin: var(--space-4) 0;
  padding-left: 30px;
}

.about-timeline::before {
  content: '';
  position: absolute;
  left: 8px;
  top: 6px;
  bottom: 6px;
  width: 3px;
  background: linear-gradient(180deg, var(--color-gold), var(--color-gold-deep) 55%, var(--color-gold));
  border-radius: 3px;
}

.about-timeline__item {
  position: relative;
  margin-bottom: var(--space-3);
}

.about-timeline__item::before {
  content: '';
  position: absolute;
  left: -30px;
  top: 16px;
  width: 16px;
  height: 16px;
  background: var(--color-black);
  border: 3px solid var(--color-gold);
  border-radius: 50%;
  box-shadow: 0 0 0 3px rgba(10, 31, 68, 0.9), var(--about-gold-glow);
}

.about-timeline__item summary {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.55rem 0.9rem;
  cursor: pointer;
  list-style: none;
  padding: 0.35rem 0;
}

.about-timeline__item summary::-webkit-details-marker {
  display: none;
}

.about-timeline__year {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 3.5rem;
  padding: 0.28rem 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.06rem;
  color: var(--color-gold-light);
  background: var(--color-black);
  border: 2px solid var(--color-gold);
  border-radius: 10px;
}

.about-timeline__heading {
  font-family: var(--font-heading);
  font-size: 1.02rem;
  color: var(--color-white);
  letter-spacing: 0.02em;
}

.about-timeline__detail {
  padding: 0.7rem 0 0.2rem;
}

.about-timeline__detail p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
}

.about-timeline__item summary::after {
  content: '+';
  margin-left: auto;
  font-family: var(--font-heading);
  font-size: 1.15rem;
  color: var(--color-gold);
}

.about-timeline__item[open] summary::after {
  content: '-';
}

/* ===== 周二更新网格 ===== */
.about-update-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-3);
  margin: var(--space-4) 0;
}

.about-update-card {
  padding: var(--space-3);
  background: rgba(0, 0, 0, 0.4);
  border-left: 3px solid var(--color-gold);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.about-update-card h3 {
  margin: 0 0 0.5rem;
  font-family: var(--font-heading);
  font-size: 1.08rem;
  color: var(--color-gold-light);
}

.about-update-card p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
}

/* ===== 安全与资质 ===== */
.about-security {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-4);
}

.about-security__list {
  list-style: none;
  margin: var(--space-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-2);
}

.about-security__list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.97rem;
  line-height: 1.7;
}

.about-security__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 0.55rem;
  height: 0.55rem;
  background: var(--color-gold);
  transform: rotate(45deg);
}

.about-security__stamp {
  display: none;
}

/* ===== 未来承诺 ===== */
.about-future__stamp {
  position: relative;
  z-index: 1;
  width: 190px;
  margin: var(--space-4) auto;
}

.about-future__stamp svg {
  display: block;
  width: 100%;
  height: auto;
}

.about-future__tagline {
  position: relative;
  z-index: 1;
  margin: var(--space-3) 0 0;
  text-align: center;
  font-family: var(--font-heading);
  font-size: 1.3rem;
  letter-spacing: 0.04em;
  color: var(--color-gold-light);
}

/* ===== 动画 ===== */
@keyframes page-about-glow {
  0%, 100% {
    box-shadow: 0 0 0 rgba(212, 175, 55, 0);
  }
  50% {
    box-shadow: 0 0 16px rgba(212, 175, 55, 0.5);
  }
}

/* ===== 断点：平板 ===== */
@media (min-width: 700px) {
  .about-hero__grid {
    padding: var(--space-5) var(--space-4);
  }

  .about-hero__stats {
    gap: var(--space-3);
  }

  .about-section {
    padding: var(--space-5) var(--space-4);
  }

  .about-update-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .about-security {
    grid-template-columns: 1fr 1fr;
    align-items: start;
  }

  .about-security__stamp {
    display: flex;
    justify-content: center;
    align-items: center;
    grid-column: 1 / -1;
    width: 170px;
    height: 170px;
    margin: 0 auto;
  }
}

/* ===== 断点：桌面 ===== */
@media (min-width: 981px) {
  .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) 240px;
    gap: var(--space-5);
    align-items: center;
    padding: var(--space-5) var(--space-4);
  }

  .about-hero__visual {
    display: block;
    justify-self: end;
  }

  .about-hero__typo {
    font-size: 8.5rem;
  }

  .about-layout {
    grid-template-columns: 240px minmax(0, 1fr);
    gap: var(--space-5);
    align-items: start;
  }

  .about-toc__nav {
    flex-direction: column;
    flex-wrap: nowrap;
    overflow: visible;
    gap: var(--space-1);
  }

  .about-toc__link {
    display: flex;
    align-items: baseline;
  }
}

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