.page-about {
  --about-rule: 1px solid var(--silver-300);
  background: var(--cream);
  color: var(--ink);
  padding-bottom: clamp(56px, 8vw, 120px);
}

.page-about .container {
  max-width: var(--shell);
}

/* ---------- Hero ---------- */

.page-about .about-hero {
  padding-top: clamp(22px, 3vw, 40px);
}

.page-about .about-hero .container {
  border-top: var(--about-rule);
  padding-top: clamp(26px, 4vw, 54px);
}

.page-about .about-hero-title {
  margin: 14px 0 0;
  max-width: 16ch;
  color: var(--navy-900);
}

.page-about .about-hero-foot {
  display: grid;
  gap: clamp(26px, 3vw, 44px);
  margin-top: clamp(26px, 3.4vw, 46px);
}

.page-about .about-hero-lede {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(16px, 1.25vw, 18px);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-hero-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: var(--about-rule);
  border-left: var(--about-rule);
}

.page-about .about-hero-facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  border-right: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-fact-num {
  font-family: var(--font-data);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--orange);
}

.page-about .about-fact-label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--navy-700);
}

@media (min-width: 900px) {
  .page-about .about-hero-foot {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
  }
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 通用小标题区 ---------- */

.page-about .about-sec-head {
  max-width: 62ch;
  margin-bottom: clamp(26px, 3.4vw, 46px);
}

.page-about .about-sec-head .h2 {
  margin: 10px 0 0;
  color: var(--navy-900);
}

.page-about .about-sec-head--split {
  max-width: none;
  display: grid;
  gap: clamp(16px, 2vw, 32px);
}

.page-about .about-sec-lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--navy-700);
  max-width: 62ch;
}

@media (min-width: 900px) {
  .page-about .about-sec-head--split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

/* ---------- 时间轴 ---------- */

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

.page-about .about-tl-item {
  display: grid;
  gap: 10px;
  padding-bottom: clamp(18px, 2.4vw, 30px);
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl-scale {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-tl-year {
  font-family: var(--font-data);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--harbor);
}

.page-about .about-tl-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cream);
  border: 1px solid var(--silver-300);
  flex: none;
}

.page-about .about-tl-node {
  border: var(--about-rule);
  background: var(--panel);
  transition: border-color var(--t) var(--ease);
}

.page-about .about-tl-node[open] {
  border-color: var(--harbor);
}

.page-about .about-tl-heading {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 15px 18px;
  cursor: pointer;
  list-style: none;
  font-size: clamp(16px, 1.35vw, 19px);
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--navy-900);
  transition: color var(--t) var(--ease);
}

.page-about .about-tl-heading::-webkit-details-marker {
  display: none;
}

.page-about .about-tl-heading:hover {
  color: var(--orange);
}

.page-about .about-tl-toggle {
  flex: none;
  font-family: var(--font-data);
  font-size: 18px;
  line-height: 1;
  color: var(--orange);
}

.page-about .about-tl-toggle::before {
  content: "+";
}

.page-about .about-tl-node[open] .about-tl-toggle::before {
  content: "–";
}

.page-about .about-tl-body {
  border-top: var(--about-rule);
  padding: 14px 18px 18px;
}

.page-about .about-tl-body p {
  margin: 0;
  max-width: 54ch;
  font-size: 15.5px;
  line-height: 1.8;
}

@media (min-width: 860px) {
  .page-about .about-tl-item {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: clamp(22px, 3vw, 46px);
  }
  .page-about .about-tl-scale {
    display: block;
    padding-right: 26px;
    text-align: right;
  }
  .page-about .about-tl-scale::after {
    content: "";
    position: absolute;
    right: 0;
    top: 4px;
    bottom: -34px;
    width: 1px;
    background: var(--silver-300);
  }
  .page-about .about-tl-item:last-child .about-tl-scale::after {
    display: none;
  }
  .page-about .about-tl-dot {
    position: absolute;
    right: -5px;
    top: 3px;
    width: 10px;
    height: 10px;
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team-photo {
  margin: 0 0 clamp(26px, 3.4vw, 46px);
  border: var(--about-rule);
  background: var(--paper);
}

.page-about .about-team-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-team-photo .media-caption {
  padding: 12px 18px;
  border-top: var(--about-rule);
  font-size: 13px;
  color: var(--navy-700);
}

.page-about .about-team-body {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-team-copy .h3 {
  margin: 0 0 14px;
  color: var(--navy-900);
}

.page-about .about-team-copy p {
  margin: 0 0 14px;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-team-copy p:last-child {
  margin-bottom: 0;
}

.page-about .about-team-detail {
  margin: 0;
  border: var(--about-rule);
  background: var(--paper);
  align-self: start;
}

.page-about .about-team-detail img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 5;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-team-body {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
  }
  .page-about .about-team-body .about-team-detail {
    margin-top: clamp(20px, 3vw, 54px);
  }
}

/* ---------- 人员构成条 ---------- */

.page-about .about-roster {
  margin-top: clamp(34px, 4.4vw, 60px);
  border-top: var(--about-rule);
  padding-top: clamp(22px, 2.8vw, 36px);
}

.page-about .about-roster-title {
  margin: 0 0 18px;
  color: var(--navy-900);
}

.page-about .about-roster-bar {
  display: flex;
  height: 64px;
  border: var(--about-rule);
  overflow: hidden;
}

.page-about .about-roster-seg {
  display: flex;
  align-items: center;
  justify-content: center;
  transition: filter var(--t) var(--ease);
}

.page-about .about-roster-seg:nth-child(1) { width: 17%; background: var(--navy-900); }
.page-about .about-roster-seg:nth-child(2) { width: 11.25%; background: var(--navy-700); }
.page-about .about-roster-seg:nth-child(3) { width: 11.75%; background: var(--harbor); }
.page-about .about-roster-seg:nth-child(4) { width: 24%; background: var(--teal); }
.page-about .about-roster-seg:nth-child(5) { width: 8.5%; background: var(--silver-300); }
.page-about .about-roster-seg:nth-child(6) { width: 27.5%; background: var(--paper); }

.page-about .about-roster-seg:hover {
  filter: brightness(1.12);
}

.page-about .about-roster-num {
  font-family: var(--font-data);
  font-size: 12px;
  letter-spacing: 0.02em;
  color: #FBF8F0;
  opacity: 0.62;
  transition: opacity var(--t) var(--ease);
}

.page-about .about-roster-seg:nth-child(5) .about-roster-num,
.page-about .about-roster-seg:nth-child(6) .about-roster-num {
  color: var(--navy-900);
  opacity: 0.7;
}

.page-about .about-roster-seg:hover .about-roster-num {
  opacity: 1;
}

.page-about .about-roster-legend {
  list-style: none;
  margin: clamp(16px, 2vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px 30px;
}

.page-about .about-roster-li {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink);
}

.page-about .about-roster-li .data {
  color: var(--navy-900);
  font-weight: 700;
}

.page-about .about-roster-key {
  width: 10px;
  height: 10px;
  flex: none;
  border: 1px solid var(--silver-300);
}

.page-about .about-roster-li--1 .about-roster-key { background: var(--navy-900); }
.page-about .about-roster-li--2 .about-roster-key { background: var(--navy-700); }
.page-about .about-roster-li--3 .about-roster-key { background: var(--harbor); }
.page-about .about-roster-li--4 .about-roster-key { background: var(--teal); }
.page-about .about-roster-li--5 .about-roster-key { background: var(--silver-300); }
.page-about .about-roster-li--6 .about-roster-key { background: var(--paper); }

@media (max-width: 639px) {
  .page-about .about-roster-bar {
    display: none;
  }
  .page-about .about-roster-legend {
    margin-top: 0;
  }
}

@media (min-width: 640px) {
  .page-about .about-roster-legend {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1040px) {
  .page-about .about-roster-legend {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 码头网络 ---------- */

.page-about .about-network-grid {
  display: grid;
  gap: clamp(24px, 3vw, 44px);
}

.page-about .about-network-visual {
  border: var(--about-rule);
  background: var(--panel);
  padding: clamp(12px, 2vw, 26px);
}

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

.page-about .about-topo-links line {
  stroke: var(--silver-300);
  stroke-width: 1;
}

.page-about .about-topo-nodes circle {
  fill: var(--panel);
  stroke: var(--navy-700);
  stroke-width: 1.5;
  cursor: pointer;
  transition: stroke var(--t) var(--ease), stroke-width var(--t) var(--ease), fill var(--t) var(--ease);
}

.page-about .about-topo-nodes circle:hover {
  stroke: var(--orange);
  stroke-width: 3.5;
  fill: var(--orange-soft);
}

.page-about .about-topo-core {
  fill: var(--orange);
  stroke: none;
}

.page-about .about-network-copy .h3 {
  margin: 0 0 14px;
  color: var(--navy-900);
}

.page-about .about-network-copy p {
  margin: 0;
  max-width: 52ch;
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-network-list {
  list-style: none;
  margin: 0 0 18px;
  padding: 0;
}

.page-about .about-network-list li {
  position: relative;
  padding: 10px 0 10px 20px;
  border-bottom: var(--about-rule);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-network-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 18px;
  width: 8px;
  height: 1px;
  background: var(--orange);
}

.page-about .about-network-photo {
  margin: clamp(28px, 3.6vw, 50px) 0 0;
  border: var(--about-rule);
  background: var(--paper);
}

.page-about .about-network-photo img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-network-photo .media-caption {
  padding: 12px 18px;
  border-top: var(--about-rule);
  font-size: 13px;
  color: var(--navy-700);
}

@media (min-width: 960px) {
  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }
}

/* ---------- 资质 ---------- */

.page-about .about-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-rule);
}

.page-about .about-honor {
  display: grid;
  gap: 6px;
  padding: clamp(18px, 2.4vw, 28px) 0;
  border-bottom: var(--about-rule);
  border-left: 2px solid transparent;
  padding-left: 18px;
  transition: border-left-color var(--t) var(--ease), background-color var(--t) var(--ease);
}

.page-about .about-honor:hover {
  border-left-color: var(--orange);
  background: var(--panel);
}

.page-about .about-honor-when {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--orange);
}

.page-about .about-honor-what {
  font-size: clamp(16px, 1.6vw, 20px);
  font-weight: 700;
  letter-spacing: -0.005em;
  color: var(--navy-900);
  line-height: 1.5;
}

@media (min-width: 820px) {
  .page-about .about-honor {
    grid-template-columns: 160px minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }
}

/* ---------- 参数维护 ---------- */

.page-about .about-params-grid {
  display: grid;
  gap: clamp(26px, 3.4vw, 48px);
}

.page-about .about-params-copy .h2 {
  margin: 10px 0 16px;
  color: var(--navy-900);
}

.page-about .about-params-copy p {
  margin: 0 0 14px;
  max-width: 46ch;
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-params-panel {
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--panel);
}

.page-about .about-params-panel .h3 {
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: var(--about-rule);
  color: var(--navy-900);
}

.page-about .about-params-list {
  margin: 0;
}

.page-about .about-params-row {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-params-row:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-params-row dt {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--harbor);
}

.page-about .about-params-row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

@media (min-width: 960px) {
  .page-about .about-params-grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: start;
  }
}

/* ---------- 后续指引 ---------- */

.page-about .about-next {
  padding-top: clamp(30px, 4vw, 54px);
}

.page-about .about-next .container {
  border-top: var(--about-rule);
  padding-top: clamp(26px, 3.2vw, 44px);
}

.page-about .about-next-title {
  margin: 0 0 20px;
  color: var(--navy-900);
}

.page-about .about-next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--silver-300);
  border: var(--about-rule);
}

.page-about .about-next-link {
  display: block;
  padding: 18px 20px;
  background: var(--cream);
  color: var(--navy-900);
  font-weight: 700;
  font-size: 15.5px;
  text-decoration: none;
  transition: background-color var(--t) var(--ease), color var(--t) var(--ease);
}

.page-about .about-next-link:hover,
.page-about .about-next-link:focus-visible {
  background: var(--navy-900);
  color: var(--cream);
}

@media (min-width: 720px) {
  .page-about .about-next-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-next-links {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 全局守则 ---------- */

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

.page-about .data {
  font-family: var(--font-data);
  letter-spacing: 0.02em;
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 1ms !important;
  }
}