/* ==========================================
   品牌故事页 | page-about
   移动优先，深蓝与金色双色体系
   ========================================== */
.page-about {
  --page-about-gold-line: rgba(212, 175, 55, 0.36);
  background: var(--white);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

/* ---------- 首屏 Hero ---------- */
.page-about__hero {
  background: var(--grad-navy);
  color: var(--white);
  padding: 108px 0 44px;
  position: relative;
  overflow: hidden;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 78% 16%, rgba(212, 175, 55, 0.14), transparent 46%);
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 66%;
  height: 100%;
  background: linear-gradient(126deg, transparent 55%, rgba(212, 175, 55, 0.12) 55%);
  clip-path: polygon(100% 0, 100% 100%, 20% 100%);
  pointer-events: none;
}

.page-about__hero-inner {
  position: relative;
  z-index: 1;
}

.page-about__hero-grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about__hero-copy .kicker {
  color: var(--gold-light);
}

.page-about__hero-copy h1 {
  font-family: var(--font-display);
  font-size: 38px;
  line-height: 1.16;
  font-weight: 800;
  margin: 14px 0 18px;
  max-width: 13em;
}

.page-about__hero-copy .lead {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.86);
  max-width: 46em;
}

.page-about__hero-meta {
  display: inline-block;
  margin-top: 22px;
  border-left: 3px solid var(--gold);
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
  max-width: 30em;
}

.page-about__hero-media {
  background: var(--navy-deep);
  border: 1px solid var(--page-about-gold-line);
  position: relative;
}

.page-about__hero-media::before {
  content: "";
  position: absolute;
  left: -8px;
  bottom: -8px;
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--gold) 50%, transparent 50%);
  z-index: 2;
}

.page-about__hero-media img {
  display: block;
  width: 100%;
}

/* ---------- 章节通用 ---------- */
.page-about__section {
  padding: 64px 0;
}

.page-about__head {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about__index {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 800;
  line-height: 1;
  color: var(--line);
  min-width: 56px;
}

.page-about__index::before {
  content: "";
  display: block;
  width: 26px;
  height: 3px;
  background: var(--gold);
  margin-bottom: 8px;
}

.page-about__index--light {
  color: rgba(255, 255, 255, 0.3);
}

.page-about__heading {
  border-left: 1px solid var(--line);
  padding-left: 16px;
}

.page-about__heading .kicker {
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.12em;
  margin-bottom: 4px;
}

.page-about__heading h2 {
  font-family: var(--font-display);
  font-size: 30px;
  font-weight: 800;
  color: var(--ink);
  margin: 0;
  position: relative;
  display: inline-block;
  padding-bottom: 4px;
}

.page-about__heading h2::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 28px;
  height: 3px;
  background: var(--gold);
  transition: width 0.25s ease;
}

.page-about__head:hover .page-about__heading h2::after {
  width: 100%;
}

/* ---------- 01 我们是谁 ---------- */
.page-about__intro {
  padding-top: 72px;
  padding-bottom: 72px;
}

.page-about__intro-grid {
  display: grid;
  gap: 32px;
}

.page-about__intro-copy {
  font-family: var(--font-body);
  color: var(--ink);
  font-size: 16px;
  line-height: 1.85;
}

.page-about__intro-copy p + p {
  margin-top: 16px;
}

.page-about__intro-copy .btn {
  margin-top: 24px;
}

.page-about__intro-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about__feature {
  background: var(--white);
  padding: 20px;
  position: relative;
  transition: box-shadow 0.2s ease;
}

.page-about__feature:hover {
  box-shadow: inset 0 0 0 1px var(--gold);
}

.page-about__feature::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 36px;
  background: var(--gold);
}

.page-about__feature-num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.06em;
}

.page-about__feature h3 {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--navy);
  margin: 8px 0 6px;
}

.page-about__feature p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
  margin: 0;
}

/* ---------- 02 数据能力积累 ---------- */
.page-about__data-block {
  background: var(--grad-navy);
  color: var(--white);
  padding-top: 64px;
  padding-bottom: 64px;
}

.page-about__data-block .page-about__heading {
  border-left-color: rgba(255, 255, 255, 0.25);
}

.page-about__data-block .page-about__heading h2 {
  color: var(--white);
}

.page-about__data-block .page-about__heading .kicker {
  color: var(--gold-light);
}

.page-about__data-grid {
  display: grid;
  gap: 32px;
}

.page-about__data-copy {
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
  font-family: var(--font-body);
}

.page-about__data-copy p + p {
  margin-top: 14px;
}

.page-about__data-price {
  margin-top: 24px;
  border: 1px solid var(--page-about-gold-line);
  background: rgba(255, 255, 255, 0.04);
  padding: 18px;
}

.page-about__price-label {
  display: block;
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--gold-light);
  margin-bottom: 12px;
}

.page-about__price-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: 7px 0;
  border-bottom: 1px dashed rgba(255, 255, 255, 0.14);
  font-family: var(--font-body);
  font-size: 16px;
}

.page-about__price-row strong {
  color: var(--gold-light);
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
}

.page-about__price-note {
  font-size: 13px;
  color: rgba(255, 255, 255, 0.6);
  margin-top: 10px;
}

.page-about__data-visual {
  display: grid;
  gap: 20px;
  align-content: start;
}

.page-about__data-media {
  border: 1px solid var(--page-about-gold-line);
  background: var(--navy-deep);
}

.page-about__data-media img {
  display: block;
  width: 100%;
}

.page-about__stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid var(--page-about-gold-line);
}

.page-about__stat {
  background: var(--navy-soft);
  padding: 16px 14px;
  text-align: left;
  transition: background 0.2s ease;
}

.page-about__stat:hover {
  background: var(--navy-deep);
}

.page-about__stat .stat-value {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  color: var(--gold-light);
  display: block;
  line-height: 1.2;
}

.page-about__stat .stat-label {
  font-family: var(--font-body);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.78);
}

/* ---------- 03 发展历程 ---------- */
.page-about__history {
  background: var(--ice);
  padding-top: 64px;
  padding-bottom: 64px;
}

.page-about__timeline {
  position: relative;
  margin-top: 40px;
  padding-left: 30px;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 4px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--gold), var(--line));
}

.page-about__milestone {
  position: relative;
  margin-bottom: 16px;
}

.page-about__milestone::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 16px;
  width: 12px;
  height: 12px;
  background: var(--white);
  border: 3px solid var(--gold);
  border-radius: 50%;
  box-shadow: 0 0 0 2px var(--ice);
}

.page-about__milestone[open]::before {
  background: var(--red);
  border-color: var(--red);
}

.page-about__milestone-summary {
  list-style: none;
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  cursor: pointer;
  background: var(--white);
  border: 1px solid var(--line);
  padding: 16px 18px;
  transition: border-color 0.2s ease;
}

.page-about__milestone-summary::-webkit-details-marker {
  display: none;
}

.page-about__milestone-summary:hover {
  border-color: var(--gold);
}

.page-about__milestone-badge {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  color: var(--white);
  background: var(--navy);
  padding: 4px 8px;
}

.page-about__milestone[open] .page-about__milestone-badge {
  background: var(--red);
}

.page-about__milestone-label {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
  flex: 1;
  min-width: 160px;
}

.page-about__milestone-summary::after {
  content: "+";
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 800;
  color: var(--gold);
  transition: transform 0.2s ease;
}

.page-about__milestone[open] > .page-about__milestone-summary::after {
  transform: rotate(45deg);
}

.page-about__milestone-body {
  background: var(--white);
  border: 1px solid var(--line);
  border-top: 0;
  padding: 18px;
}

.page-about__milestone-body p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  margin: 0;
}

.page-about__history-more {
  margin-top: 28px;
  text-align: center;
}

/* ---------- 04 团队构成 ---------- */
.page-about__team {
  padding-top: 64px;
  padding-bottom: 64px;
}

.page-about__team-grid {
  display: grid;
  gap: 32px;
}

.page-about__team-copy {
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink);
  font-family: var(--font-body);
}

.page-about__team-copy .media {
  margin-top: 22px;
  border: 1px solid var(--line);
  background: var(--ice);
}

.page-about__team-copy .media img {
  display: block;
  width: 100%;
}

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

.page-about__department {
  display: grid;
  grid-template-columns: 44px 1fr;
  grid-template-rows: auto auto;
  column-gap: 16px;
  background: var(--white);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  padding: 18px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about__department:hover {
  border-color: var(--gold);
  box-shadow: 0 4px 14px rgba(10, 31, 61, 0.06);
}

.page-about__department-index {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  color: var(--line);
  grid-row: 1 / 3;
}

.page-about__department h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--navy);
  margin: 0;
}

.page-about__department p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 6px 0 0;
}

/* ---------- 05 资质与荣誉 ---------- */
.page-about__honors {
  background: linear-gradient(135deg, #FBF6E8, #F7EFD8);
  padding-top: 64px;
  padding-bottom: 64px;
}

.page-about__honors-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about__cert {
  background: var(--white);
  border: 1px solid var(--line);
  padding: 22px;
  position: relative;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about__cert:hover {
  border-color: var(--gold);
  box-shadow: 0 4px 14px rgba(10, 31, 61, 0.08);
}

.page-about__cert-icon {
  width: 36px;
  height: 36px;
  background: var(--grad-gold);
  position: relative;
  margin-bottom: 14px;
}

.page-about__cert-icon::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid var(--navy);
}

.page-about__cert h3 {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--navy);
  margin: 0 0 8px;
}

.page-about__cert p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
  margin: 0;
}

.page-about__partners {
  margin-top: 28px;
  background: var(--navy);
  color: var(--white);
  padding: 26px;
  border-left: 4px solid var(--gold);
}

.page-about__partners-head h3 {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--gold-light);
  margin: 0 0 8px;
}

.page-about__partners-head p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.82);
  margin: 0;
}

.page-about__partner-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 22px;
}

.page-about__partners-contact {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
  margin: 0 0 16px;
}

.page-about__partners-btn {
  margin-top: 4px;
}

/* ---------- 信任声明 ---------- */
.page-about__trust {
  background: var(--navy-deep);
  color: rgba(255, 255, 255, 0.7);
  text-align: center;
  padding: 28px 20px;
  font-size: 14px;
  letter-spacing: 0.02em;
  border-top: 1px solid var(--page-about-gold-line);
}

.page-about__trust p {
  margin: 0;
}

/* ---------- 桌面端增强 ---------- */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 128px 0 64px;
  }

  .page-about__hero-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 48px;
  }

  .page-about__hero-copy h1 {
    font-size: 48px;
  }

  .page-about__hero-copy .lead {
    font-size: 18px;
  }

  .page-about__section {
    padding: 88px 0;
  }

  .page-about__head {
    margin-bottom: 44px;
  }

  .page-about__index {
    font-size: 52px;
    min-width: 64px;
  }

  .page-about__heading h2 {
    font-size: 36px;
  }

  .page-about__intro-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: 56px;
  }

  .page-about__data-grid {
    grid-template-columns: 1fr 1.05fr;
    align-items: start;
    gap: 56px;
  }

  .page-about__team-grid {
    grid-template-columns: 1fr 1fr;
    align-items: start;
    gap: 56px;
  }

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

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

  .page-about__timeline {
    padding-left: 40px;
  }

  .page-about__timeline::before {
    left: 12px;
  }

  .page-about__milestone::before {
    left: -38px;
    width: 16px;
    height: 16px;
  }

  .page-about__milestone-summary {
    padding: 18px 22px;
  }

  .page-about__milestone-body {
    padding: 20px 22px;
  }

  .page-about__partners {
    padding: 32px;
  }

  .page-about__cert {
    padding: 26px;
  }
}

@media (min-width: 1200px) {
  .page-about__stats {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__stat .stat-value {
    font-size: 30px;
  }

  .page-about__hero-media::before {
    left: -12px;
    bottom: -12px;
    width: 44px;
    height: 44px;
  }
}