.page-about {
  --about-line: rgba(55, 243, 210, .26);
  --about-line-soft: rgba(155, 176, 191, .2);
  --about-line-dark: rgba(42, 28, 22, .16);
  --about-glow: rgba(55, 243, 210, .16);
  --about-paper-card: #FBF5EA;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + 26px) 0 clamp(42px, 6vw, 76px);
  color: var(--paper);
  background:
    radial-gradient(110% 80% at 88% -10%, var(--about-glow), transparent 58%),
    radial-gradient(70% 60% at -10% 110%, rgba(255, 107, 74, .16), transparent 62%),
    linear-gradient(168deg, #071A2B 0%, #0B2E4A 58%, #05131F 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  opacity: .55;
  background-image: repeating-linear-gradient(90deg, rgba(155, 176, 191, .09) 0 1px, transparent 1px 64px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-hero__main {
  min-width: 0;
}

.page-about .about-crumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-crumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--mist);
}

.page-about .about-crumb a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  border-bottom-color: var(--cyan);
}

.page-about .about-crumb li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(155, 176, 191, .6);
}

.page-about .about-eyebrow {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-eyebrow--dark {
  color: #A9502F;
}

.page-about .about-hero__title {
  margin: 0 0 18px;
  font-size: clamp(32px, 7.2vw, 64px);
  line-height: 1.05;
  letter-spacing: -.025em;
  font-weight: 900;
  color: var(--paper);
}

.page-about .about-mark {
  position: relative;
  display: inline-block;
  color: var(--cyan);
}

.page-about .about-mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -.12em;
  height: 6px;
  background: linear-gradient(90deg, var(--coral), rgba(255, 107, 74, 0));
}

.page-about .about-hero__lead {
  max-width: 54ch;
  margin: 0;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(244, 235, 221, .84);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(26px, 3.5vw, 40px);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--about-line);
  min-width: 0;
}

.page-about .stat__num {
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .stat__num small {
  font-size: .45em;
  margin-left: 2px;
  color: var(--mist);
  letter-spacing: 0;
}

.page-about .stat__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-index {
  align-self: start;
  padding: 16px 18px 8px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(5, 19, 31, .55);
}

.page-about .about-index__title {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--coral);
}

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

.page-about .about-index__list li + li {
  border-top: 1px dashed var(--about-line-soft);
}

.page-about .about-index__list a {
  display: flex;
  gap: 12px;
  align-items: baseline;
  padding: 10px 0;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  transition: color .2s var(--ease), padding-left .2s var(--ease);
}

.page-about .about-index__list a span {
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--cyan);
  padding-left: 4px;
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  position: relative;
  padding: clamp(48px, 7vw, 96px) 0;
}

.page-about .about-paper {
  color: var(--brown);
  background-color: var(--paper);
  background-image: repeating-linear-gradient(0deg, rgba(42, 28, 22, .035) 0 1px, transparent 1px 7px);
}

.page-about .about-ink {
  color: var(--paper);
  background: linear-gradient(180deg, #071A2B 0%, #0B2E4A 68%, #071A2B 100%);
}

.page-about .about-sec-head {
  max-width: 760px;
  margin-bottom: clamp(26px, 4vw, 42px);
}

.page-about .about-h2 {
  margin: 6px 0 14px;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.02em;
}

.page-about .about-sec-lead {
  margin: 0;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.8;
  color: rgba(244, 235, 221, .8);
}

.page-about .about-sec-lead--dark {
  color: rgba(42, 28, 22, .76);
}

.page-about .about-paper .about-sec-lead {
  color: rgba(42, 28, 22, .76);
}

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

/* ---------- 起点与主张 ---------- */
.page-about .about-origin {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-prose {
  max-width: 62ch;
}

.page-about .about-prose p {
  margin: 0 0 1em;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: rgba(42, 28, 22, .84);
}

.page-about .about-prose a {
  color: #A9502F;
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 80, 47, .4);
}

.page-about .about-prose a:hover,
.page-about .about-prose a:focus-visible {
  border-bottom-color: #A9502F;
}

.page-about .about-notes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  align-content: start;
}

.page-about .note {
  padding: 14px 16px 16px;
  border: 1px solid var(--about-line-dark);
  border-left: 3px solid var(--coral);
  border-radius: var(--radius);
  background: var(--about-paper-card);
  box-shadow: var(--shadow-print);
  transition: transform .24s var(--ease), box-shadow .24s var(--ease);
}

.page-about .note:hover,
.page-about .note:focus-within {
  transform: translate(-2px, -2px);
  box-shadow: 12px 12px 0 rgba(11, 46, 74, .12);
}

.page-about .note__k {
  margin: 0;
  font-size: 11px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: #A9502F;
}

.page-about .note__v {
  margin: 6px 0 8px;
  font-size: clamp(20px, 2.6vw, 26px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--ink-2);
}

.page-about .note__v small {
  font-size: .5em;
  color: rgba(42, 28, 22, .55);
  letter-spacing: 0;
}

.page-about .note p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: rgba(42, 28, 22, .76);
}

/* ---------- 时间线 ---------- */
.page-about .about-tl-figure {
  margin: 0 0 clamp(30px, 4.5vw, 48px);
  border: 1px solid var(--about-line);
  background: rgba(5, 19, 31, .5);
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(55, 243, 210, .45) 45%, rgba(55, 243, 210, .04) 100%);
}

.page-about .tl-item {
  position: relative;
  width: 100%;
  margin-bottom: 18px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 18px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
}

.page-about .tl-card {
  padding: 16px 18px 18px;
  border: 1px solid rgba(55, 243, 210, .2);
  border-radius: var(--radius);
  background: rgba(11, 46, 74, .66);
  transition: border-color .24s var(--ease), transform .24s var(--ease);
}

.page-about .tl-card:hover,
.page-about .tl-card:focus-within {
  border-color: rgba(55, 243, 210, .55);
  transform: translateY(-2px);
}

.page-about .tl-year {
  display: block;
  font-size: clamp(24px, 4.4vw, 34px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--cyan);
}

.page-about .tl-title {
  margin: 8px 0 8px;
  font-size: clamp(16px, 2.2vw, 20px);
  line-height: 1.3;
}

.page-about .tl-card p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .78);
}

.page-about .tl-tag {
  font-family: var(--font-mono);
  font-size: 11px;
}

/* ---------- 维护方法 ---------- */
.page-about .steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .step {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px;
  border: 1px solid var(--about-line-dark);
  border-top: 3px solid var(--amber);
  border-radius: var(--radius);
  background: var(--about-paper-card);
  box-shadow: var(--shadow-print);
}

.page-about .step:nth-child(3) {
  border-top-color: var(--cyan);
}

.page-about .step__no {
  font-size: 12px;
  letter-spacing: .2em;
  color: #A9502F;
}

.page-about .step h3 {
  margin: 0;
  font-size: 18px;
  line-height: 1.35;
  color: var(--brown);
}

.page-about .step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(42, 28, 22, .78);
}

.page-about .step__meta {
  margin-top: auto;
  padding-top: 10px;
  border-top: 1px dashed var(--about-line-dark);
  font-size: 12px;
  color: rgba(42, 28, 22, .6);
}

.page-about .about-sla {
  margin-top: clamp(18px, 2.5vw, 26px);
  padding: 18px 20px;
  border: 1px dashed rgba(169, 80, 47, .45);
  border-radius: var(--radius);
  background: rgba(232, 162, 58, .12);
}

.page-about .about-sla p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(42, 28, 22, .84);
}

.page-about .about-sla strong {
  color: var(--brown);
}

.page-about .about-sla a {
  color: #A9502F;
  text-decoration: none;
  border-bottom: 1px solid rgba(169, 80, 47, .45);
}

/* ---------- 服务范围 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-cov-figure {
  margin: 0;
  border: 1px solid var(--about-line);
  background: rgba(5, 19, 31, .55);
}

.page-about .scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .scene {
  padding: 12px 0 12px 16px;
  border-left: 2px solid rgba(55, 243, 210, .45);
}

.page-about .scene h3 {
  margin: 0 0 6px;
  font-size: 15.5px;
  line-height: 1.4;
  color: var(--cyan);
}

.page-about .scene p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .8);
}

.page-about .scene a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 243, 210, .6);
}

.page-about .scene a:hover,
.page-about .scene a:focus-visible {
  color: var(--cyan);
}

.page-about .event-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .evt {
  padding: 5px 10px;
  border: 1px solid rgba(232, 162, 58, .5);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  color: var(--amber);
  background: rgba(232, 162, 58, .1);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-team-figure {
  margin: 0;
  border: 1px solid var(--about-line-dark);
  background: var(--about-paper-card);
  box-shadow: var(--shadow-print);
}

.page-about .role-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  margin-top: 22px;
}

.page-about .role {
  padding: 14px;
  border: 1px solid var(--about-line-dark);
  border-radius: var(--radius);
  background: var(--about-paper-card);
  min-width: 0;
}

.page-about .role__num {
  display: block;
  font-size: clamp(22px, 3vw, 28px);
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--ink-2);
}

.page-about .role h3 {
  margin: 8px 0 6px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--brown);
  position: relative;
  padding-left: 10px;
}

.page-about .role h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: .55em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--coral);
}

.page-about .role p {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(42, 28, 22, .74);
}

.page-about .coop {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--about-line-dark);
}

.page-about .coop p {
  margin: 0 0 10px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(42, 28, 22, .8);
}

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

.page-about .coop strong {
  font-family: var(--font-mono);
  font-size: 15px;
  color: #A9502F;
}

/* ---------- 信任 ---------- */
.page-about .trust-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .trust {
  padding: 16px 18px 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: rgba(5, 19, 31, .5);
}

.page-about .trust__v {
  margin: 0 0 10px;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.15;
  letter-spacing: -.01em;
  color: var(--cyan);
  word-break: break-word;
}

.page-about .trust__v small {
  font-size: .55em;
  color: var(--mist);
  letter-spacing: 0;
}

.page-about .trust h3 {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .trust p:last-child {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: rgba(244, 235, 221, .76);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.5vw, 38px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-notes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .tl-item {
    width: 88%;
  }

  .page-about .tl-item:nth-child(even) {
    margin-left: auto;
  }

  .page-about .tl-item:nth-child(even)::before {
    left: -25px;
  }

  .page-about .scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, .75fr);
    align-items: start;
  }

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

  .page-about .about-origin {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, .8fr) minmax(0, 1.2fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .trust-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-sec-head {
    margin-bottom: clamp(32px, 4vw, 48px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .note,
  .page-about .tl-card,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .note:hover,
  .page-about .note:focus-within,
  .page-about .tl-card:hover,
  .page-about .tl-card:focus-within {
    transform: none;
  }
}