.page-about {
  --about-line: rgba(90, 110, 104, 0.45);
  --about-line-cyan: rgba(46, 242, 198, 0.32);
  --about-measure: 720px;
  position: relative;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(3rem, 7vw, 6rem);
  color: var(--mist);
}

.page-about::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 420px;
  background: radial-gradient(120% 80% at 84% 0%, rgba(46, 242, 198, 0.11), transparent 62%);
  pointer-events: none;
  z-index: 0;
}

.page-about .container {
  position: relative;
  z-index: 1;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  gap: clamp(1.5rem, 3vw, 2.75rem);
  align-items: end;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(1.75rem, 4vw, 3rem);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero h1 {
  margin: 0.7rem 0 0;
  font-family: var(--sans);
  font-weight: 700;
  font-size: clamp(2rem, 5.4vw, 3.6rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  margin: 1.1rem 0 0;
  font-size: clamp(0.97rem, 1.6vw, 1.06rem);
  line-height: 1.85;
  color: rgba(234, 246, 242, 0.82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .about-hero__figure {
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border: 1px solid var(--about-line-cyan);
  border-radius: var(--radius);
}

.page-about .about-hero__figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--moss);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  display: grid;
  gap: clamp(2rem, 4vw, 3.25rem);
  padding-top: clamp(2rem, 5vw, 3.5rem);
}

@media (min-width: 1080px) {
  .page-about .about-body {
    grid-template-columns: minmax(0, var(--about-measure)) minmax(0, 1fr);
    gap: clamp(2.5rem, 5vw, 4.5rem);
  }
}

.page-about .about-section {
  scroll-margin-top: 6rem;
}

.page-about .about-section + .about-section {
  margin-top: clamp(2.5rem, 6vw, 4.5rem);
}

.page-about .about-section__head {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  padding-left: 1.15rem;
  margin-bottom: 1.05rem;
}

.page-about .about-section__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.1em;
  bottom: 0.1em;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(46, 242, 198, 0.06) 100%);
}

.page-about .about-section__idx {
  font-family: var(--mono);
  font-weight: 300;
  font-size: 0.8rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
  opacity: 0.85;
}

.page-about .about-section__title {
  margin: 0;
  font-size: clamp(1.35rem, 3vw, 1.95rem);
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-lede {
  max-width: 62ch;
  margin: 0 0 1.4rem;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(234, 246, 242, 0.8);
}

.page-about .about-note {
  margin: 1.25rem 0 0;
  font-family: var(--mono);
  font-size: 0.82rem;
  letter-spacing: 0.06em;
  color: var(--moss);
}

/* ---------- 班次 ---------- */

.page-about .shift-list {
  list-style: none;
  margin: 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .shift {
  background: var(--ink-2);
  padding: 1.05rem 1.1rem 1.2rem;
  transition: background 0.16s var(--ease);
}

.page-about .shift:hover {
  background: #16342c;
}

.page-about .shift__slot {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0 0 0.6rem;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .shift__slot::before {
  content: "";
  width: 0.4rem;
  height: 0.4rem;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 3px rgba(46, 242, 198, 0.14);
}

.page-about .shift__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(234, 246, 242, 0.76);
}

@media (min-width: 620px) {
  .page-about .shift-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 配图 ---------- */

.page-about .about-figure {
  margin: 0 0 1.6rem;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: var(--ink-2);
}

.page-about .about-figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--moss);
}

/* ---------- 时间轴 ---------- */

.page-about .timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0.25rem 0 0.25rem 1.5rem;
}

.page-about .timeline__list::before {
  content: "";
  position: absolute;
  left: 0.35rem;
  top: 0.7rem;
  bottom: 0.7rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(46, 242, 198, 0.6), rgba(90, 110, 104, 0.3));
}

.page-about .timeline__item + .timeline__item {
  margin-top: 1.15rem;
}

.page-about .timeline__node {
  position: relative;
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  left: -1.15rem;
  top: 0.42rem;
  width: 0.62rem;
  height: 0.62rem;
  border-radius: 50%;
  border: 2px solid rgba(46, 242, 198, 0.55);
  background: var(--ink);
  transform: translateX(-50%);
  transition: background 0.16s var(--ease), border-color 0.16s var(--ease),
    box-shadow 0.16s var(--ease);
}

.page-about .timeline__node[open]::before {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(46, 242, 198, 0.13);
}

.page-about .timeline__node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.75rem;
  cursor: pointer;
  list-style: none;
  padding-bottom: 0.3rem;
}

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

.page-about .timeline__node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--mono);
  font-size: 0.95rem;
  line-height: 1;
  color: var(--moss);
  transition: color 0.16s var(--ease);
}

.page-about .timeline__node[open] summary::after {
  content: "\2013";
  color: var(--cyan);
}

.page-about .timeline__node summary:hover .timeline__title,
.page-about .timeline__node summary:focus-visible .timeline__title {
  color: var(--cyan-soft);
}

.page-about .timeline__node summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

.page-about .timeline__stage {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .timeline__title {
  font-size: 0.98rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--mist);
  transition: color 0.16s var(--ease);
}

.page-about .timeline__body {
  max-width: 60ch;
  margin: 0.5rem 0 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: rgba(234, 246, 242, 0.72);
}

/* ---------- 数据流程 ---------- */

.page-about .flow-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.9rem;
  counter-reset: flow;
}

.page-about .flow {
  position: relative;
  padding: 0.9rem 1rem 1rem 3.1rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(20, 46, 39, 0.9), rgba(11, 31, 26, 0.9));
  transition: border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .flow:hover {
  border-color: var(--about-line-cyan);
  transform: translateY(-2px);
}

.page-about .flow__num {
  position: absolute;
  left: 1rem;
  top: 0.95rem;
  font-family: var(--mono);
  font-weight: 900;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .flow__title {
  margin: 0 0 0.4rem;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--mist);
}

.page-about .flow__text {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: rgba(234, 246, 242, 0.74);
}

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

/* ---------- 团队岗位 ---------- */

.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--about-line);
}

.page-about .role {
  padding: 1.05rem 0 1.1rem;
  border-bottom: 1px solid var(--about-line);
}

.page-about .role__name {
  margin: 0 0 0.45rem;
  font-size: 1rem;
  font-weight: 600;
  color: var(--cyan-soft);
}

.page-about .role__text {
  max-width: 62ch;
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.82;
  color: rgba(234, 246, 242, 0.76);
}

/* ---------- 服务对象 ---------- */

.page-about .service-grid {
  display: grid;
  gap: 1rem;
}

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

.page-about .service {
  padding: 1.25rem 1.2rem 1.35rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  background: var(--ink-2);
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.page-about .service:first-child {
  border-top: 3px solid var(--cyan);
}

.page-about .service:last-child {
  border-top: 3px solid var(--amber);
}

.page-about .service__title {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--mist);
}

.page-about .service__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.82;
  color: rgba(234, 246, 242, 0.76);
}

.page-about .service__link {
  align-self: flex-start;
  margin-top: 0.35rem;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 242, 198, 0.4);
  padding-bottom: 0.1rem;
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease);
}

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

/* ---------- 联系方式 ---------- */

.page-about .contact-grid {
  margin: 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

@media (min-width: 720px) {
  .page-about .contact-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .contact-grid__row--wide {
    grid-column: 1 / -1;
  }
}

.page-about .contact-grid__row {
  background: var(--ink-2);
  padding: 1rem 1.1rem 1.1rem;
}

.page-about .contact-grid__row dt {
  font-family: var(--sans);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--moss);
}

.page-about .contact-grid__row dd {
  margin: 0.45rem 0 0;
  font-family: var(--mono);
  font-size: 0.93rem;
  line-height: 1.6;
  color: var(--mist);
  word-break: break-word;
}

.page-about .contact-grid__row dd small {
  display: block;
  margin-top: 0.35rem;
  font-family: var(--sans);
  font-size: 0.78rem;
  letter-spacing: 0;
  text-transform: none;
  color: var(--moss);
}

/* ---------- 右侧旁注栏 ---------- */

.page-about .about-body__rail {
  display: grid;
  gap: 1.6rem;
  align-content: start;
}

@media (min-width: 1080px) {
  .page-about .about-body__rail {
    position: sticky;
    top: 6rem;
  }
}

.page-about .rail-index__list {
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
}

.page-about .rail-index__list a {
  display: block;
  padding: 0.4rem 0 0.4rem 0.85rem;
  border-left: 1px solid var(--about-line);
  font-size: 0.87rem;
  line-height: 1.5;
  text-decoration: none;
  color: var(--moss);
  transition: color 0.16s var(--ease), border-color 0.16s var(--ease),
    padding-left 0.16s var(--ease);
}

.page-about .rail-index__list a:hover,
.page-about .rail-index__list a:focus-visible {
  color: var(--cyan);
  border-left-color: var(--cyan);
  padding-left: 1.05rem;
}

.page-about .fact-list {
  list-style: none;
  margin: 0.8rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .fact {
  padding: 0.7rem 0.8rem 0.75rem;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-sm);
  background: var(--ink-2);
  transition: border-color 0.16s var(--ease), transform 0.16s var(--ease);
}

.page-about .fact:hover {
  border-color: var(--about-line-cyan);
  transform: translateY(-2px);
}

.page-about .fact__num {
  font-family: var(--mono);
  font-weight: 900;
  font-size: 1.35rem;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .fact__unit {
  margin-left: 0.2rem;
  font-size: 0.76rem;
  color: var(--moss);
}

.page-about .fact__label {
  display: block;
  margin-top: 0.15rem;
  font-size: 0.84rem;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .fact__note {
  display: block;
  margin-top: 0.2rem;
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--moss);
  opacity: 0.72;
  transition: opacity 0.16s var(--ease), color 0.16s var(--ease);
}

.page-about .fact:hover .fact__note {
  opacity: 1;
  color: var(--cyan-soft);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .shift,
  .page-about .flow,
  .page-about .fact,
  .page-about .timeline__node::before,
  .page-about .timeline__title,
  .page-about .rail-index__list a {
    transition: none;
  }
  .page-about .flow:hover,
  .page-about .fact:hover {
    transform: none;
  }
}