.page-about {
  --about-rule: rgba(31, 224, 208, .16);
  --about-rule-soft: rgba(157, 178, 192, .14);
  --about-panel: rgba(8, 33, 51, .86);
  --about-band: linear-gradient(180deg, var(--abyss-800) 0%, var(--abyss-900) 100%);
}

/* ---------- 首屏 ---------- */

.page-about .about-open {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--about-rule);
  background:
    radial-gradient(130% 92% at 92% -12%, rgba(31, 224, 208, .14), transparent 58%),
    linear-gradient(180deg, var(--abyss-900) 0%, var(--abyss-800) 100%);
}

.page-about .about-open::after {
  content: "";
  position: absolute;
  right: -12%;
  bottom: -46%;
  width: 66%;
  height: 78%;
  background: linear-gradient(114deg, transparent 36%, rgba(31, 224, 208, .07) 36.4%, transparent 63%);
  pointer-events: none;
}

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

.page-about .about-open__grid {
  display: grid;
  gap: var(--s6);
  margin-top: var(--s4);
}

.page-about .about-open__lead .h1 {
  max-width: 20ch;
}

.page-about .about-open__lead .lede {
  margin-top: var(--s4);
  color: var(--ink-soft);
}

.page-about .about-side__cap {
  margin: 0 0 var(--s3);
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--pulse);
}

.page-about .about-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-rule-soft);
  border: 1px solid var(--about-rule-soft);
  border-radius: var(--r2);
  overflow: hidden;
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: var(--s3) var(--s3);
  background: var(--about-panel);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(24px, 6vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--pulse);
}

.page-about .about-fact__k {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ink-dim);
}

/* ---------- 品牌起点 ---------- */

.page-about .about-origin {
  display: grid;
  gap: var(--s6);
}

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

.page-about .about-origin__text p {
  margin: 0 0 var(--s4);
  max-width: 68ch;
  color: var(--ink-soft);
}

.page-about .about-origin__text p:first-child::first-letter {
  float: left;
  margin: .08em .12em 0 0;
  font-family: var(--font-display);
  font-size: 3.1em;
  font-weight: 900;
  line-height: .86;
  color: var(--pulse);
}

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

/* ---------- 四条业务线 ---------- */

.page-about .about-lines {
  display: grid;
  gap: 0;
  margin: var(--s6) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-line {
  position: relative;
  padding: var(--s5, 40px) 0 var(--s6);
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .about-line:last-child {
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-line__act {
  position: absolute;
  top: var(--s5, 40px);
  left: 0;
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 900;
  line-height: 1;
  color: rgba(31, 224, 208, .18);
  letter-spacing: -0.03em;
}

.page-about .about-line .h3 {
  margin: 0 0 var(--s3);
  padding-left: 56px;
}

.page-about .about-line p {
  margin: 0 0 var(--s3);
  padding-left: 56px;
  max-width: 70ch;
  color: var(--ink-soft);
}

.page-about .about-line__meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--s1) var(--s1);
  padding-left: 56px;
  margin-bottom: 0;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  display: grid;
  gap: var(--s6);
  margin-top: var(--s6);
}

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

.page-about .about-team__body > p {
  margin: 0 0 var(--s6);
  max-width: 68ch;
  color: var(--ink-soft);
}

.page-about .about-bars {
  display: grid;
  gap: var(--s4);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-bar {
  display: grid;
  gap: var(--s2);
}

.page-about .about-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: var(--s2);
}

.page-about .about-bar__label {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-bar__val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  font-weight: 700;
  color: var(--pulse);
}

.page-about .about-bar__duty {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink-dim);
}

/* ---------- 更新节奏 ---------- */

.page-about .about-rhythm {
  display: grid;
  gap: var(--s3);
  margin-top: var(--s6);
}

.page-about .about-rhythm__item {
  position: relative;
  padding: var(--s4) var(--s3) var(--s4) var(--s4);
  background: var(--about-band);
  border: 1px solid var(--about-rule-soft);
  border-radius: var(--r2);
  overflow: hidden;
}

.page-about .about-rhythm__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--pulse), rgba(31, 224, 208, 0));
}

.page-about .about-rhythm__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(28px, 8vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .about-rhythm__item .h4 {
  margin: var(--s3) 0 var(--s2);
}

.page-about .about-rhythm__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--ink-dim);
}

/* ---------- 发展历程 ---------- */

.page-about .about-tl {
  display: grid;
  gap: var(--s6);
  margin-top: var(--s6);
}

.page-about .about-tl__pins {
  display: flex;
  gap: var(--s2);
  overflow-x: auto;
  padding-bottom: var(--s1);
  border-bottom: 1px solid var(--about-rule-soft);
  scrollbar-width: thin;
}

.page-about .about-tl__pin {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: var(--s2) var(--s3);
  border: 1px solid var(--about-rule-soft);
  border-radius: var(--r1);
  text-decoration: none;
  background: rgba(14, 44, 69, .42);
  transition: border-color .18s ease, transform .18s ease;
}

.page-about .about-tl__pin .num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 17px;
  font-weight: 700;
  color: var(--pulse);
}

.page-about .about-tl__pin em {
  font-style: normal;
  font-size: 12px;
  color: var(--ink-dim);
}

.page-about .about-tl__pin:hover,
.page-about .about-tl__pin:focus-visible {
  border-color: var(--line-strong);
  transform: translateY(-2px);
}

.page-about .about-tl__list {
  position: relative;
  display: grid;
  gap: var(--s6);
  margin: 0;
  padding: 0 0 0 var(--s4);
  list-style: none;
}

.page-about .about-tl__list::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 5px;
  width: 1px;
  background: linear-gradient(180deg, var(--pulse), rgba(31, 224, 208, .12) 70%, transparent);
}

.page-about .about-tl__item {
  position: relative;
  display: grid;
  gap: var(--s2);
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  top: 7px;
  left: calc(-1 * var(--s4) + 1px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--pulse);
  box-shadow: 0 0 0 4px rgba(31, 224, 208, .14);
}

.page-about .about-tl__item:target::before {
  background: var(--amber);
  box-shadow: 0 0 0 6px rgba(255, 197, 61, .18);
}

.page-about .about-tl__year {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(26px, 7vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan-300);
}

.page-about .about-tl__body .h4 {
  margin: 0 0 var(--s2);
}

.page-about .about-tl__body p {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  display: grid;
  gap: var(--s3);
  margin-top: var(--s6);
}

.page-about .about-eco__card {
  position: relative;
  padding: var(--s5, 40px) var(--s4) var(--s4);
  background: linear-gradient(160deg, rgba(14, 44, 69, .72), rgba(4, 18, 31, .92));
  border: 1px solid var(--about-rule-soft);
  border-radius: var(--r3);
  overflow: hidden;
}

.page-about .about-eco__card::after {
  content: "";
  position: absolute;
  right: -30%;
  top: -60%;
  width: 70%;
  height: 160%;
  background: linear-gradient(112deg, transparent 42%, rgba(31, 224, 208, .06) 42.5%, transparent 68%);
  pointer-events: none;
}

.page-about .about-eco__num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(36px, 10vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--pulse);
}

.page-about .about-eco__card .h4 {
  margin: var(--s3) 0 var(--s2);
}

.page-about .about-eco__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- 服务地区与联系 ---------- */

.page-about .about-service {
  display: grid;
  gap: var(--s6);
  margin-top: var(--s6);
}

.page-about .about-service__body > p {
  margin: 0 0 var(--s4);
  max-width: 68ch;
  color: var(--ink-soft);
}

.page-about .about-service__body a {
  color: var(--pulse);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
}

.page-about .about-service__body a:hover,
.page-about .about-service__body a:focus-visible {
  color: var(--cyan-300);
}

.page-about .about-service__contact {
  display: grid;
  gap: 1px;
  margin: 0 0 var(--s4);
  padding: 0;
  background: var(--about-rule-soft);
  border: 1px solid var(--about-rule-soft);
  border-radius: var(--r2);
  overflow: hidden;
}

.page-about .about-service__row {
  display: grid;
  gap: 4px;
  padding: var(--s3);
  background: var(--about-panel);
}

.page-about .about-service__row dt {
  font-family: var(--font-label);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--ink-dim);
}

.page-about .about-service__row dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-service__row dd:first-of-type {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

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

/* ---------- 为什么选择我们 ---------- */

.page-about .about-why {
  display: grid;
  gap: var(--s3);
  margin-top: var(--s6);
}

.page-about .about-why__item {
  position: relative;
  padding: var(--s4) var(--s4) var(--s4) var(--s6);
  border-left: 1px solid var(--about-rule);
  background: linear-gradient(90deg, rgba(31, 224, 208, .05), transparent 62%);
}

.page-about .about-why__item::before {
  content: "";
  position: absolute;
  top: calc(var(--s4) + 6px);
  left: -4px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--coral);
}

.page-about .about-why__item .h4 {
  margin: 0 0 var(--s2);
}

.page-about .about-why__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-dim);
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  display: grid;
  gap: var(--s3);
  margin-top: var(--s6);
}

.page-about .about-next__card {
  display: grid;
  gap: var(--s2);
  padding: var(--s4);
  border: 1px solid var(--about-rule-soft);
  border-radius: var(--r3);
  background: var(--about-panel);
  text-decoration: none;
  color: var(--ink);
  transition: border-color .18s ease, transform .18s ease, background .18s ease;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--line-strong);
  transform: translateY(-3px);
  background: rgba(14, 44, 69, .82);
}

.page-about .about-next__no {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--pulse);
}

.page-about .about-next__card .h4 {
  margin: 0;
}

.page-about .about-next__card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-dim);
}

.page-about .about-next__go {
  margin-top: var(--s2);
  font-family: var(--font-label);
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--pulse);
}

.page-about .about-next__card--coral {
  border-color: rgba(255, 107, 74, .38);
  background: linear-gradient(150deg, rgba(255, 107, 74, .12), rgba(4, 18, 31, .9));
}

.page-about .about-next__card--coral .about-next__no,
.page-about .about-next__card--coral .about-next__go {
  color: var(--coral);
}

.page-about .about-next__card--coral:hover,
.page-about .about-next__card--coral:focus-visible {
  border-color: var(--coral);
  background: linear-gradient(150deg, rgba(255, 107, 74, .2), rgba(4, 18, 31, .92));
}

/* ---------- 响应式 ---------- */

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

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

  .page-about .about-eco__card--wide {
    grid-column: 1 / -1;
  }

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

@media (min-width: 900px) {
  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: var(--s8);
  }

  .page-about .about-open__side {
    padding-bottom: var(--s1);
  }

  .page-about .about-origin {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
    gap: var(--s8);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
    gap: var(--s8);
  }

  .page-about .about-team__media {
    position: sticky;
    top: calc(var(--pulse-h) + var(--s6));
  }

  .page-about .about-rhythm {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-tl {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: var(--s8);
    align-items: start;
  }

  .page-about .about-tl__pins {
    position: sticky;
    top: calc(var(--pulse-h) + var(--s6));
    flex-direction: column;
    gap: var(--s2);
    overflow: visible;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-rule-soft);
    padding-left: var(--s2);
  }

  .page-about .about-tl__pin {
    flex-direction: row;
    align-items: baseline;
    gap: var(--s2);
  }

  .page-about .about-tl__pins::before {
    content: "里程碑";
    display: block;
    margin-bottom: var(--s2);
    font-family: var(--font-label);
    font-size: 12px;
    letter-spacing: .08em;
    text-transform: uppercase;
    color: var(--pulse);
  }

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

  .page-about .about-eco__card--wide {
    grid-column: span 3;
  }

  .page-about .about-service {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: start;
    gap: var(--s8);
  }

  .page-about .about-why {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--s6) var(--s8);
  }

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

@media (min-width: 1200px) {
  .page-about .about-open__lead .h1 {
    max-width: 22ch;
  }

  .page-about .about-line {
    display: grid;
    grid-template-columns: minmax(0, 20ch) minmax(0, 1fr);
    column-gap: var(--s6);
    align-items: start;
  }

  .page-about .about-line__act {
    position: static;
    grid-row: 1 / span 3;
    font-size: 64px;
    padding-top: 2px;
  }

  .page-about .about-line .h3,
  .page-about .about-line p,
  .page-about .about-line__meta {
    grid-column: 2;
    padding-left: 0;
  }

  .page-about .about-line .h3 {
    margin-top: 0;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__pin,
  .page-about .about-next__card {
    transition: none;
  }

  .page-about .about-tl__pin:hover,
  .page-about .about-tl__pin:focus-visible,
  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}

.page-about {
  --s5: 1rem;
}