.page-about {
  --about-rail-w: 118px;
  --about-gap: clamp(22px, 2.8vw, 48px);
  color: var(--warm-white);
}

/* ---------- 首屏封面 ---------- */
.page-about .about-cover {
  position: relative;
  isolation: isolate;
  padding: clamp(20px, 3vw, 40px) 0 clamp(34px, 5vw, 72px);
  border-bottom: 1px solid rgba(140, 106, 47, 0.28);
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: -18% -8% 0;
  z-index: -1;
  background:
    radial-gradient(closest-side at 78% 20%, rgba(201, 162, 39, 0.16), transparent 100%),
    radial-gradient(closest-side at 6% 86%, rgba(78, 140, 122, 0.13), transparent 100%);
  pointer-events: none;
}

.page-about .crumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(18px, 3vw, 32px);
  font-size: 13px;
  color: rgba(246, 242, 233, 0.62);
}

.page-about .crumbs a {
  color: rgba(246, 242, 233, 0.78);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--gold);
}

.page-about .about-cover-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 56px);
  align-items: center;
}

.page-about .about-cover-tag {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--gold-light);
}

.page-about .about-cover-tag::before {
  content: "";
  width: 26px;
  height: 1px;
  background: var(--line-gold);
}

.page-about .about-cover h1 {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 4.1vw, 56px);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--warm-white);
  text-wrap: balance;
}

.page-about .about-cover .lead {
  margin: 18px 0 0;
  max-width: 42ch;
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.78;
  color: rgba(246, 242, 233, 0.82);
}

.page-about .about-cover-jump {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 4px clamp(14px, 2vw, 30px);
}

.page-about .about-cover-jump a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  font-size: 14px;
  color: rgba(246, 242, 233, 0.86);
  text-decoration: none;
  border-bottom: 1px solid rgba(140, 106, 47, 0.3);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-cover-jump a:hover,
.page-about .about-cover-jump a:focus-visible {
  color: var(--gold-light);
  border-bottom-color: var(--gold);
  transform: translateX(3px);
}

.page-about .about-jump-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-cover-media {
  position: relative;
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(224, 193, 112, 0.34);
  box-shadow: 0 30px 70px -34px rgba(0, 0, 0, 0.85);
}

.page-about .about-cover-media::after {
  content: "";
  position: absolute;
  inset: 9px;
  border: 1px solid rgba(224, 193, 112, 0.22);
  border-radius: calc(var(--radius) - 5px);
  pointer-events: none;
}

.page-about .about-cover-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 左栏索引 + 右栏内容 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
  padding-top: clamp(38px, 5vw, 78px);
  padding-bottom: clamp(40px, 6vw, 90px);
}

.page-about .about-rail {
  position: sticky;
  top: calc(var(--topbar-h) + 22px);
  align-self: start;
}

.page-about .about-rail-title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--rock);
}

.page-about .about-rail-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.page-about .about-rail-list::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, rgba(140, 106, 47, 0.5), rgba(224, 193, 112, 0.28), rgba(140, 106, 47, 0.1));
}

.page-about .about-rail-list a {
  position: relative;
  display: block;
  padding: 8px 0 8px 18px;
  font-size: 13px;
  line-height: 1.35;
  color: rgba(246, 242, 233, 0.66);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}

.page-about .about-rail-list a::before {
  content: "";
  position: absolute;
  left: 0;
  top: 15px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-deep);
  border: 1px solid rgba(201, 162, 39, 0.5);
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--gold-light);
}

.page-about .about-rail-list a:hover::before,
.page-about .about-rail-list a:focus-visible::before {
  background: var(--gold);
  border-color: var(--gold-light);
  transform: scale(1.15);
}

.page-about .about-stream {
  display: flex;
  flex-direction: column;
  gap: clamp(44px, 6vw, 96px);
  min-width: 0;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 2fr);
  gap: clamp(16px, 2.4vw, 40px);
  min-width: 0;
  scroll-margin-top: calc(var(--topbar-h) + 24px);
}

.page-about .about-sec--stack {
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-sec--stack .about-sec-heading {
  max-width: 48ch;
}

.page-about .about-sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-content: start;
  min-width: 0;
}

.page-about .about-sec-num {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.3em;
  color: rgba(201, 162, 39, 0.78);
  padding-top: 4px;
}

.page-about .about-sec-heading h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(21px, 2.1vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--warm-white);
}

.page-about .about-sec-note {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(246, 242, 233, 0.58);
}

.page-about .about-sec-body {
  min-width: 0;
}

/* ---------- 米白卡纸层 ---------- */
.page-about .about-sec--paper {
  position: relative;
  overflow: hidden;
  background: var(--paper);
  border-radius: var(--radius);
  padding: clamp(22px, 3vw, 46px);
  color: var(--ink-deep);
  box-shadow: 0 26px 60px -40px rgba(0, 0, 0, 0.7);
}

.page-about .about-sec--paper::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: var(--grad-gold);
}

.page-about .about-sec--paper .about-sec-heading h2 {
  color: var(--ink-deep);
}

.page-about .about-sec--paper .about-sec-note {
  color: rgba(18, 41, 74, 0.66);
}

.page-about .about-sec--paper .about-sec-num {
  color: rgba(140, 106, 47, 0.85);
}

/* ---------- 01 服务对象 ---------- */
.page-about .about-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.4vw, 40px);
}

.page-about .about-pair-col {
  padding-top: 16px;
  border-top: 2px solid rgba(201, 162, 39, 0.4);
}

.page-about .about-pair-col:last-child {
  border-top-color: rgba(78, 140, 122, 0.5);
}

.page-about .about-pair-col h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--gold-light);
}

.page-about .about-pair-col:last-child h3 {
  color: var(--celadon-light);
}

.page-about .about-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(246, 242, 233, 0.78);
}

.page-about .about-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-sec--paper .about-points li {
  color: rgba(18, 41, 74, 0.82);
}

.page-about .about-sec--paper .about-points li::before {
  background: var(--gold-deep);
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline {
  min-width: 0;
}

.page-about .about-tl-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 2.4vw, 30px);
}

.page-about .about-tl-axis {
  position: absolute;
  left: 11px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  height: auto;
  pointer-events: none;
}

.page-about .about-tl-item {
  position: relative;
  padding-left: 38px;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 5px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--grad-gold);
  box-shadow: 0 0 0 4px var(--ink-deep), 0 0 0 5px rgba(201, 162, 39, 0.28);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.page-about .about-tl-item:hover::before,
.page-about .about-tl-item:focus-within::before {
  transform: scale(1.18);
  box-shadow: 0 0 0 4px var(--ink-deep), 0 0 0 6px rgba(201, 162, 39, 0.42);
}

.page-about .about-tl-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--gold);
}

.page-about .about-tl-body h3 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-size: 16.5px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--warm-white);
}

.page-about .about-tl-body p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(246, 242, 233, 0.72);
}

.page-about .about-tl-more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--celadon-light);
  transition: max-height 0.32s var(--ease), opacity 0.32s var(--ease), margin-top 0.32s var(--ease);
}

.page-about .about-tl-item:hover .about-tl-more,
.page-about .about-tl-item:focus-within .about-tl-more {
  max-height: 100px;
  opacity: 1;
  margin-top: 8px;
}

@media (hover: none) {
  .page-about .about-tl-more {
    max-height: 100px;
    opacity: 1;
    margin-top: 8px;
  }
}

.page-about .about-journey-media {
  margin: clamp(22px, 3vw, 34px) 0 0;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid rgba(140, 106, 47, 0.35);
}

.page-about .about-journey-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 03 服务覆盖 ---------- */
.page-about .about-net {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 2.6vw, 34px);
}

.page-about .about-net-figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 2vw, 26px);
}

.page-about .about-net-figures .stat {
  padding-top: 14px;
  border-top: 1px solid rgba(201, 162, 39, 0.42);
}

.page-about .about-net-figures .stat-value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 600;
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--gold-light);
}

.page-about .about-net-figures .stat-label {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(246, 242, 233, 0.6);
}

/* ---------- 04 团队分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: clamp(14px, 1.8vw, 26px);
  align-items: start;
}

.page-about .about-team-cell {
  padding-top: 12px;
  border-top: 2px solid rgba(18, 41, 74, 0.16);
}

.page-about .about-team-cell:nth-child(2) {
  margin-top: 26px;
}

.page-about .about-team-cell:nth-child(3) {
  margin-top: 10px;
}

.page-about .about-team-cell:nth-child(4) {
  margin-top: 34px;
}

.page-about .about-team-cell h3 {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 15.5px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--ink-deep);
}

.page-about .about-team-cell p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(18, 41, 74, 0.74);
}

/* ---------- 05 资质与安全 ---------- */
.page-about .about-trust {
  display: grid;
  grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
  gap: clamp(20px, 2.6vw, 44px);
  align-items: start;
}

.page-about .about-trust-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-trust-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 5px 12px;
  padding: 15px 0;
  border-bottom: 1px solid rgba(18, 41, 74, 0.14);
}

.page-about .about-trust-item:first-child {
  border-top: 1px solid rgba(18, 41, 74, 0.14);
}

.page-about .about-trust-dot {
  grid-row: 1 / span 2;
  align-self: start;
  margin-top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--celadon);
  box-shadow: 0 0 0 3px rgba(78, 140, 122, 0.18);
}

.page-about .about-trust-name {
  font-family: var(--font-mono);
  font-size: 13.5px;
  line-height: 1.55;
  letter-spacing: 0.01em;
  color: var(--ink-deep);
}

.page-about .about-trust-meta {
  font-size: 12.5px;
  line-height: 1.5;
  color: rgba(18, 41, 74, 0.6);
}

.page-about .about-trust-media {
  margin: 0;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid rgba(140, 106, 47, 0.3);
}

.page-about .about-trust-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

/* ---------- 06 合作生态 ---------- */
.page-about .about-partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-partner-list li {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(0, 2fr);
  gap: 6px 22px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(140, 106, 47, 0.24);
}

.page-about .about-partner-list li:first-child {
  border-top: 1px solid rgba(140, 106, 47, 0.24);
}

.page-about .about-partner-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  color: var(--gold-light);
}

.page-about .about-partner-text {
  font-size: 14px;
  line-height: 1.72;
  color: rgba(246, 242, 233, 0.74);
}

/* ---------- 收束区 ---------- */
.page-about .about-next {
  position: relative;
  padding: clamp(38px, 5vw, 78px) 0 clamp(50px, 7vw, 100px);
  border-top: 1px solid rgba(140, 106, 47, 0.3);
  background: linear-gradient(180deg, rgba(18, 41, 74, 0.55), rgba(11, 23, 48, 0));
}

.page-about .about-next h2 {
  margin: 0 0 clamp(20px, 2.6vw, 34px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.4vw, 32px);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--warm-white);
}

.page-about .about-next-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.2vw, 32px);
}

.page-about .about-next-card {
  display: block;
  padding: clamp(20px, 2.4vw, 30px);
  border: 1px solid rgba(201, 162, 39, 0.32);
  border-radius: var(--radius);
  background: rgba(18, 41, 74, 0.42);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-next-card:hover,
.page-about .about-next-card:focus-visible {
  border-color: var(--gold);
  background: rgba(18, 41, 74, 0.68);
  transform: translateY(-3px);
}

.page-about .about-next-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-next-card h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--warm-white);
}

.page-about .about-next-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(246, 242, 233, 0.72);
}

.page-about .about-next-foot {
  margin: clamp(20px, 2.6vw, 30px) 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(246, 242, 233, 0.62);
}

.page-about .about-next-foot a {
  color: var(--gold-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.5);
  transition: border-color 0.18s var(--ease);
}

.page-about .about-next-foot a:hover,
.page-about .about-next-foot a:focus-visible {
  border-bottom-color: var(--gold-light);
}

/* ---------- 焦点与进入动效 ---------- */
.page-about a:focus-visible {
  outline: 2px solid var(--celadon);
  outline-offset: 3px;
  border-radius: 4px;
}

@keyframes aboutRise {
  from {
    opacity: 0;
    transform: translateY(16px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}

.page-about [data-reveal] {
  animation: aboutRise 0.5s var(--ease) both;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    animation: none;
  }
  .page-about .about-cover-jump a:hover,
  .page-about .about-next-card:hover {
    transform: none;
  }
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 1fr);
    gap: clamp(20px, 3vw, 32px);
  }

  .page-about .about-rail {
    position: static;
  }

  .page-about .about-rail-title {
    margin-bottom: 8px;
  }

  .page-about .about-rail-list {
    flex-direction: row;
    gap: 8px;
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: none;
  }

  .page-about .about-rail-list::-webkit-scrollbar {
    display: none;
  }

  .page-about .about-rail-list::before {
    display: none;
  }

  .page-about .about-rail-list a {
    white-space: nowrap;
    padding: 7px 14px;
    font-size: 12.5px;
    border: 1px solid rgba(201, 162, 39, 0.32);
    border-radius: 999px;
  }

  .page-about .about-rail-list a::before {
    display: none;
  }
}

@media (max-width: 900px) {
  .page-about .about-cover-inner {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-cover-media {
    order: -1;
  }

  .page-about .about-sec {
    grid-template-columns: minmax(0, 1fr);
    gap: 18px;
  }

  .page-about .about-sec--stack {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-sec-num {
    writing-mode: horizontal-tb;
    letter-spacing: 0.28em;
    padding-top: 3px;
  }

  .page-about .about-team {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 18px;
  }

  .page-about .about-team-cell:nth-child(n) {
    margin-top: 0;
  }

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

  .page-about .about-trust-media {
    max-width: 420px;
  }
}

@media (max-width: 640px) {
  .page-about .about-cover h1 {
    font-size: clamp(25px, 7.6vw, 33px);
  }

  .page-about .about-cover-jump {
    grid-template-columns: minmax(0, 1fr);
  }

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

  .page-about .about-net-figures {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

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

  .page-about .about-partner-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 6px;
  }

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

  .page-about .about-tl-more {
    max-height: 100px;
    opacity: 1;
    margin-top: 8px;
  }
}