/* ===== 品牌介绍页 /introduction/ ===== */
.page-about {
  --about-rail-w: 190px;
  --about-gap: clamp(38px, 6vw, 76px);
}

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

/* ---- 首屏 ---- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--felt);
  border-bottom: 1px solid var(--moss);
}

.page-about .about-hero-cut {
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(640px, 80vw);
  height: 152%;
  background: linear-gradient(158deg, var(--table) 0%, var(--table-deep) 62%, rgba(14, 36, 30, 0) 100%);
  clip-path: polygon(32% 0%, 100% 0%, 100% 100%, 0% 100%);
  pointer-events: none;
}

.page-about .about-hero-cut::after {
  content: "";
  position: absolute;
  inset: 16% 10% 16% 22%;
  background-image:
    linear-gradient(rgba(200, 155, 74, 0.10) 1px, transparent 1px),
    linear-gradient(90deg, rgba(200, 155, 74, 0.10) 1px, transparent 1px);
  background-size: 46px 46px;
  border-radius: var(--r-lg);
  transform: rotate(-6deg);
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  padding-block: clamp(28px, 5vw, 58px) clamp(36px, 7vw, 78px);
}

.page-about .about-title {
  margin: 16px 0 0;
  max-width: 24ch;
  font-size: clamp(30px, 6.4vw, 62px);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-title em {
  font-style: normal;
  color: var(--copper);
}

.page-about .about-lead {
  margin: 20px 0 0;
  max-width: 62ch;
  color: var(--sand);
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.75;
}

.page-about .about-hero-tags {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

/* ---- 主体：左轨 + 内容 ---- */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 48px);
  padding-top: clamp(30px, 5vw, 58px);
  padding-bottom: clamp(48px, 8vw, 96px);
}

.page-about .about-rail-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .about-rail-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rail-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--moss);
  border-radius: var(--r-pill);
  color: var(--sand);
  font-size: 13px;
  line-height: 1.4;
  text-decoration: none;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  border-color: var(--copper);
  color: var(--gold);
  background: rgba(31, 74, 60, 0.35);
}

.page-about .about-rail-list .mono {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--copper);
}

.page-about .about-rail-foot {
  margin: 14px 0 0;
  font-size: 12.5px;
  color: var(--stone);
}

/* ---- 章节通用 ---- */
.page-about .about-section + .about-section {
  margin-top: var(--about-gap);
}

.page-about .about-kicker {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--copper);
}

.page-about .about-h2 {
  margin: 0;
  font-size: clamp(23px, 3.6vw, 38px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-p {
  margin: 16px 0 0;
  max-width: 64ch;
  color: var(--sand);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-inline-link {
  margin: 20px 0 0;
  font-size: 14.5px;
  color: var(--stone);
}

.page-about .about-inline-link a {
  color: var(--copper);
  text-decoration: none;
  border-bottom: 1px solid var(--copper-deep);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-inline-link a:hover,
.page-about .about-inline-link a:focus-visible {
  color: var(--gold);
  border-color: var(--gold);
}

/* ---- 01 团队 ---- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-team-card {
  position: relative;
  padding: 20px 18px 18px;
  background: var(--table);
  border: 1px solid var(--moss);
  border-radius: var(--r-md);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-team-card::after {
  content: "";
  position: absolute;
  top: 16px;
  right: 16px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--moss);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-team-card:hover {
  border-color: var(--copper);
  transform: translateY(-3px);
}

.page-about .about-team-card:hover::after {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(230, 192, 120, 0.16);
}

.page-about .about-team-num {
  margin: 0;
  font-size: 32px;
  line-height: 1;
  color: var(--copper);
  letter-spacing: 0.02em;
}

.page-about .about-team-role {
  margin: 12px 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-team-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---- 02 流程 ---- */
.page-about .about-flow-media {
  margin: 22px 0 26px;
  border: 1px solid var(--moss);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--table-deep);
}

.page-about .about-flow-media img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-flow-media .media-caption {
  padding: 10px 16px 12px;
  font-size: 12.5px;
  color: var(--stone);
  border-top: 1px solid var(--moss);
}

.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 18px;
  background: var(--table-deep);
  border: 1px solid var(--moss);
  border-left: 3px solid var(--moss);
  border-radius: var(--r-md);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-step:hover {
  border-color: var(--copper);
  border-left-color: var(--copper);
  transform: translateX(3px);
}

.page-about .about-step-no {
  font-size: 22px;
  line-height: 1;
  color: var(--copper-deep);
  transition: color var(--dur) var(--ease);
}

.page-about .about-step:hover .about-step-no {
  color: var(--gold);
}

.page-about .about-step-body h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-step-body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--sand);
}

.page-about .about-step-out {
  margin-top: 10px !important;
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--stone) !important;
}

/* ---- 03 时间轴 ---- */
.page-about .about-timeline {
  margin: 24px 0 0;
  padding: 0 0 0 4px;
  list-style: none;
  border-left: 1px solid var(--moss);
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 26px 22px;
  border-radius: var(--r-sm);
  transition: background-color var(--dur) var(--ease);
}

.page-about .about-tl-item:last-child {
  padding-bottom: 4px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--table);
  border: 2px solid var(--moss);
  transition: border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-tl-item.is-current::before {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
}

.page-about .about-tl-item:target {
  background: rgba(31, 74, 60, 0.34);
}

.page-about .about-tl-item:target::before {
  background: var(--copper);
  border-color: var(--copper);
}

.page-about .about-tl-year {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--copper);
}

.page-about .about-tl-title {
  margin: 6px 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-tl-text {
  margin: 0;
  max-width: 60ch;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--sand);
}

/* ---- 04 段位徽章 ---- */
.page-about .about-ranks {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(72px, 1fr));
  gap: 18px 10px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rank {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 9px;
}

.page-about .about-rank-ring {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  font-size: 13px;
  color: var(--paper);
  border: 2px solid var(--moss);
  background: radial-gradient(circle at 50% 28%, rgba(200, 155, 74, 0.13), transparent 68%);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-rank:nth-child(3) .about-rank-ring,
.page-about .about-rank:nth-child(4) .about-rank-ring {
  border-color: var(--copper-deep);
}

.page-about .about-rank:nth-child(5) .about-rank-ring,
.page-about .about-rank:nth-child(6) .about-rank-ring {
  border-color: var(--copper);
  box-shadow: 0 0 0 3px rgba(200, 155, 74, 0.08);
}

.page-about .about-rank:nth-child(7) .about-rank-ring {
  border-color: var(--gold);
  box-shadow: 0 0 0 6px rgba(230, 192, 120, 0.14);
  color: var(--gold);
}

.page-about .about-rank:hover .about-rank-ring {
  border-color: var(--gold);
  color: var(--gold);
  transform: translateY(-2px);
}

.page-about .about-rank-name {
  font-size: 13px;
  color: var(--stone);
  transition: color var(--dur) var(--ease);
}

.page-about .about-rank:hover .about-rank-name {
  color: var(--sand);
}

/* ---- 05 双端同步 ---- */
.page-about .about-dual {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin-top: 20px;
}

.page-about .about-dual-list {
  margin-top: 20px;
}

.page-about .about-dual-media {
  margin: 0;
  border: 1px solid var(--moss);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--table-deep);
}

.page-about .about-dual-media img {
  width: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

/* ---- 06 数据一览 ---- */
.page-about .about-databand {
  margin-top: var(--about-gap);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(22px, 4vw, 40px);
  background: var(--table-deep);
  border: 1px solid var(--moss);
  border-radius: var(--r-lg);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
  margin-top: 22px;
}

.page-about .about-stat {
  padding-top: 12px;
  border-top: 1px solid var(--moss);
  transition: border-top-color var(--dur) var(--ease);
}

.page-about .about-stat:hover {
  border-top-color: var(--copper);
}

.page-about .about-stat-num {
  display: block;
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1;
  color: var(--copper);
  letter-spacing: 0.02em;
  transition: color var(--dur) var(--ease);
}

.page-about .about-stat:hover .about-stat-num {
  color: var(--gold);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 7px;
  font-size: 14px;
  color: var(--paper);
}

.page-about .about-stat-note {
  display: block;
  margin-top: 5px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--stone);
  transition: color var(--dur) var(--ease);
}

.page-about .about-stat:hover .about-stat-note {
  color: var(--sand);
}

.page-about .about-databand-media {
  margin: 0;
  border: 1px solid var(--moss);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-databand-media img {
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ---- 07 合作 ---- */
.page-about .about-coop-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-coop-card {
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .about-coop-card:hover {
  border-color: var(--copper);
  transform: translateY(-3px);
}

.page-about .about-coop-card h3 {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-coop-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---- 收束 ---- */
.page-about .about-outro {
  margin-top: var(--about-gap);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  align-items: center;
  padding: clamp(22px, 4vw, 38px);
  background: linear-gradient(118deg, var(--table) 0%, var(--table-deep) 100%);
  border: 1px solid var(--moss);
  border-radius: var(--r-lg);
}

.page-about .about-outro-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ===== 断点 ===== */
@media (min-width: 640px) {
  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-coop-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-outro {
    grid-template-columns: minmax(0, 1fr) auto;
  }
  .page-about .about-outro-actions {
    justify-content: flex-end;
  }
}

@media (min-width: 820px) {
  .page-about .about-dual {
    grid-template-columns: minmax(0, 1fr) 236px;
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .about-databand {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 60px);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .about-rail-list {
    flex-direction: column;
    gap: 0;
  }

  .page-about .about-rail-list a {
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 3px;
    padding: 10px 0 10px 14px;
    border: 0;
    border-left: 2px solid var(--moss);
    border-radius: 0;
    background: transparent;
    font-size: 13.5px;
  }

  .page-about .about-rail-list a:hover,
  .page-about .about-rail-list a:focus-visible {
    border-left-color: var(--copper);
    background: rgba(31, 74, 60, 0.28);
  }

  .page-about .about-team {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-team-card:nth-child(2n) {
    transform: translateY(16px);
  }

  .page-about .about-team-card:nth-child(2n):hover {
    transform: translateY(12px);
  }

  .page-about .about-databand {
    margin-right: calc(-1 * clamp(8px, 2vw, 22px));
  }

  .page-about .about-coop-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-step:first-child {
    grid-column: 1 / -1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team-card,
  .page-about .about-step,
  .page-about .about-coop-card,
  .page-about .about-rank-ring,
  .page-about .about-rail-list a {
    transition: none;
  }
  .page-about .about-team-card:hover,
  .page-about .about-step:hover,
  .page-about .about-coop-card:hover,
  .page-about .about-rank:hover .about-rank-ring {
    transform: none;
  }
  .page-about .about-team-card:nth-child(2n),
  .page-about .about-team-card:nth-child(2n):hover {
    transform: translateY(16px);
  }
}