.page-about {
  --about-gap: clamp(56px, 8vw, 116px);
  --about-cut: 20px;
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(64px, 8vw, 112px);
  color: var(--white);
  font-family: var(--font-sans);
}

.page-about a {
  color: var(--cyan);
  text-decoration: none;
}

.page-about a:hover {
  color: var(--cyan-mist);
}

.page-about a:focus-visible,
.page-about button:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 24px 0 6px;
  font-size: 13px;
  color: var(--muted);
}

.page-about .crumbs__sep {
  color: var(--dim);
}

.page-about .crumbs [aria-current="page"] {
  color: var(--white);
}

/* ---------- 章节公共头 ---------- */
.page-about .about-sec {
  margin-top: var(--about-gap);
}

.page-about .eyebrow {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .eyebrow .mono {
  color: var(--cyan);
  letter-spacing: 0.08em;
}

.page-about .about-sec__head h2 {
  margin: 14px 0 14px;
  font-size: clamp(26px, 3.8vw, 46px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -0.02em;
}

.page-about .about-sec__lead {
  margin: 0;
  max-width: 40em;
  font-size: 16px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(12px, 3vw, 36px);
}

.page-about .ab-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .ab-hero__lead h1 {
  margin: 16px 0 0;
  font-size: clamp(34px, 6.6vw, 86px);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.page-about .ab-hero__lead h1 em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .ab-hero__lede {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 36em;
  font-size: 17px;
  line-height: 1.8;
  color: var(--white);
}

.page-about .ab-hero__sub {
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .ab-hero__media {
  margin: 0;
  position: relative;
}

.page-about .ab-hero__media::after {
  content: "";
  position: absolute;
  inset: auto -6% -8% 30%;
  height: 60%;
  background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.18), transparent 70%);
  pointer-events: none;
  z-index: -1;
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .ab-hero__facts {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .ab-hero__facts > div {
  background: var(--ink-deep);
  padding: 16px 20px;
}

.page-about .ab-hero__facts dt {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .ab-hero__facts dd {
  margin: 8px 0 0;
  font-size: 15px;
  color: var(--white);
  letter-spacing: 0.04em;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin-top: clamp(30px, 4vw, 48px);
  display: grid;
  gap: clamp(32px, 5vw, 56px);
}

.page-about .timeline {
  --tl-c1: 26px;
  --tl-c2: 16px;
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: calc(var(--tl-c1) + var(--tl-c2) / 2 - 1px);
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(0, 229, 255, 0.28) 55%, var(--orange) 100%);
}

.page-about .tl__item {
  display: grid;
  grid-template-columns: var(--tl-c1) var(--tl-c2) minmax(0, 1fr);
  position: relative;
  padding-bottom: clamp(26px, 3.6vw, 42px);
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: calc(var(--tl-c1) + var(--tl-c2) / 2 - 5px);
  top: 7px;
  width: 10px;
  height: 10px;
  background: var(--cyan);
  transform: rotate(45deg);
}

.page-about .tl__num {
  grid-column: 1;
  text-align: right;
  padding-right: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  line-height: 1.6;
}

.page-about .tl__body {
  grid-column: 3;
  min-width: 0;
}

.page-about .tl__body h3 {
  margin: 0;
  font-size: clamp(18px, 2.1vw, 23px);
  font-weight: 900;
  letter-spacing: -0.01em;
}

.page-about .tl__body p {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
  max-width: 34em;
}

.page-about .tl__fact {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--cyan-mist);
  padding-left: 12px;
  border-left: 2px solid var(--line);
}

.page-about .tl__item--now::after {
  background: var(--orange);
}

.page-about .tl__item--now .tl__num {
  color: var(--orange);
}

.page-about .tl__item--now .tl__body h3 {
  color: var(--orange-sand);
}

.page-about .tl__item--media {
  display: block;
  padding-bottom: clamp(28px, 4vw, 44px);
}

.page-about .tl__item--media::after {
  display: none;
}

.page-about .tl__figure {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--panel);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

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

.page-about .tl__figure figcaption {
  padding: 12px 16px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
  border-top: 1px solid var(--line);
}

/* ---------- 旁注栏 ---------- */
.page-about .about-aside {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .aside-card {
  background: rgba(18, 42, 87, 0.55);
  border-left: 2px solid var(--cyan);
  padding: 18px 20px;
}

.page-about .aside-card__k {
  margin: 0;
  font-size: clamp(28px, 3.4vw, 38px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .aside-card__t {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .aside-card--note {
  border-left-color: var(--dim);
  background: rgba(6, 21, 48, 0.75);
}

/* ---------- 服务清单表 ---------- */
.page-about .svc-wrap {
  margin-top: clamp(26px, 3.6vw, 40px);
  overflow-x: auto;
  border: 1px solid var(--line);
}

.page-about .svc-table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
  font-size: 15px;
  text-align: left;
}

.page-about .svc-caption {
  caption-side: top;
  padding: 14px 18px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  background: var(--ink-deep);
  border-bottom: 1px solid var(--line);
}

.page-about .svc-table thead th {
  background: var(--panel);
  padding: 14px 16px;
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.16em;
  color: var(--cyan-mist);
  border-bottom: 2px solid var(--cyan);
}

.page-about .svc-table thead th:first-child {
  clip-path: polygon(0 0, 100% 0, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about .svc-table tbody tr:nth-child(odd) {
  background: rgba(18, 42, 87, 0.42);
}

.page-about .svc-table tbody tr {
  transition: background 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .svc-table tbody tr:hover {
  background: var(--panel);
  box-shadow: inset 3px 0 0 var(--orange);
}

.page-about .svc-table tbody th,
.page-about .svc-table tbody td {
  padding: 15px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
  line-height: 1.7;
  font-weight: 400;
}

.page-about .svc-table tbody td {
  color: var(--muted);
  font-size: 14px;
}

.page-about .svc-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .svc-count {
  display: inline-block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--orange-sand);
  border: 1px solid rgba(255, 177, 153, 0.35);
  padding: 1px 7px;
}

.page-about .svc-foot {
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 44em;
}

/* ---------- 内容生产流程 ---------- */
.page-about .flow {
  list-style: none;
  margin: clamp(26px, 3.6vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .flow__item {
  background: var(--ink-deep);
  padding: 20px 20px 22px;
  transition: background 180ms var(--ease);
}

.page-about .flow__item:hover {
  background: var(--panel);
}

.page-about .flow__i {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
  border-bottom: 2px solid var(--orange);
  padding-bottom: 2px;
}

.page-about .flow__item h3 {
  margin: 12px 0 0;
  font-size: 18px;
  font-weight: 900;
}

.page-about .flow__item p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .flow__note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 14px;
  line-height: 1.8;
  color: var(--cyan-mist);
  max-width: 42em;
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  margin-top: clamp(26px, 3.6vw, 40px);
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .team-lead {
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(18, 42, 87, 0.9), rgba(6, 21, 48, 0.9));
  padding: 24px 22px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .team-lead__num {
  margin: 0;
  font-size: clamp(48px, 7vw, 76px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.04em;
}

.page-about .team-lead__cap {
  margin: 10px 0 0;
  font-size: 14px;
  letter-spacing: 0.12em;
  color: var(--white);
}

.page-about .team-lead__desc {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .team-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "label val"
    "track track";
  gap: 8px 12px;
  align-items: center;
}

.page-about .team-bar__label {
  grid-area: label;
  font-size: 14px;
  color: var(--white);
}

.page-about .team-bar__val {
  grid-area: val;
  font-size: 14px;
  color: var(--cyan-mist);
}

.page-about .team-bar__track {
  grid-area: track;
  display: block;
  height: 6px;
  background: rgba(36, 64, 111, 0.65);
  position: relative;
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: var(--cyan);
  transition: width 400ms var(--ease);
}

.page-about .team-bar__fill--a { width: 26%; }
.page-about .team-bar__fill--b { width: 20%; background: var(--cyan-mist); }
.page-about .team-bar__fill--c { width: 33%; }
.page-about .team-bar__fill--d { width: 21%; background: var(--orange); }

/* ---------- 协作 ---------- */
.page-about .partner {
  margin-top: clamp(28px, 4vw, 48px);
  display: grid;
  gap: clamp(22px, 3.4vw, 36px);
  border-top: 1px solid var(--line);
  padding-top: clamp(24px, 3.4vw, 36px);
}

.page-about .partner__fig {
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-deep);
}

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

.page-about .partner__body h3 {
  margin: 0;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 900;
}

.page-about .partner__body > p {
  margin: 12px 0 20px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 38em;
}

.page-about .fold {
  border: 1px solid var(--line);
  background: rgba(18, 42, 87, 0.4);
  margin-bottom: 10px;
}

.page-about .fold summary {
  cursor: pointer;
  padding: 14px 18px;
  font-size: 15px;
  color: var(--white);
  list-style: none;
  position: relative;
  transition: color 180ms var(--ease), background 180ms var(--ease);
}

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

.page-about .fold summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--cyan);
  font-size: 16px;
}

.page-about .fold[open] summary::after {
  content: "–";
  color: var(--orange);
}

.page-about .fold summary:hover {
  color: var(--cyan-mist);
  background: rgba(0, 229, 255, 0.05);
}

.page-about .fold p {
  margin: 0;
  padding: 0 18px 16px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

/* ---------- 服务保障 ---------- */
.page-about .guarantee {
  margin-top: clamp(26px, 3.6vw, 40px);
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .guarantee__item {
  background: var(--ink-deep);
  padding: 20px 22px;
}

.page-about .guarantee__num {
  font-size: clamp(20px, 2.4vw, 26px);
  color: var(--orange);
  letter-spacing: -0.01em;
}

.page-about .guarantee__item p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .contact-strip {
  margin-top: clamp(22px, 3vw, 32px);
  border-left: 2px solid var(--cyan);
  background: rgba(18, 42, 87, 0.5);
  padding: 4px 0;
}

.page-about .contact-strip__row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 14px;
  padding: 12px 18px;
  border-bottom: 1px solid rgba(36, 64, 111, 0.7);
}

.page-about .contact-strip__row:last-child {
  border-bottom: 0;
}

.page-about .contact-strip__label {
  flex: 0 0 auto;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
  min-width: 4.5em;
}

.page-about .contact-strip__value {
  font-size: 15px;
  color: var(--white);
  word-break: break-word;
}

.page-about .contact-strip .copy-btn {
  margin-left: auto;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  background: transparent;
  border: 1px solid var(--line);
  padding: 4px 10px;
  cursor: pointer;
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.page-about .contact-strip .copy-btn:hover {
  border-color: var(--cyan);
  color: var(--cyan-mist);
}

.page-about .contact-strip .copy-btn[data-copied="true"] {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .support-foot {
  margin: 20px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
  max-width: 44em;
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .timeline {
    --tl-c1: 34px;
    --tl-c2: 20px;
  }

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

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

  .page-about .flow {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .ab-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 7fr);
    align-items: start;
  }

  .page-about .partner {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }

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

  .page-about .flow__item:first-child {
    grid-column: span 1;
  }
}

@media (min-width: 1024px) {
  .page-about .about-timeline {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-aside {
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .svc-table tbody tr,
  .page-about .flow__item,
  .page-about .team-bar__fill,
  .page-about .fold summary,
  .page-about .contact-strip .copy-btn {
    transition: none;
  }
}