.page-about {
  background: var(--ink);
  color: var(--text);
}

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

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 clamp(22px, 4vw, 40px);
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumb a {
  color: var(--text);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

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

.page-about .breadcrumb__sep {
  color: var(--line);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 4vw, 32px) 0 clamp(44px, 7vw, 84px);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(70% 90% at 88% -10%, rgba(55, 242, 214, 0.14), transparent 70%),
    radial-gradient(60% 80% at -10% 110%, rgba(123, 97, 255, 0.16), transparent 70%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(28, 51, 80, 0.5) 1px, transparent 1px),
    linear-gradient(90deg, rgba(28, 51, 80, 0.5) 1px, transparent 1px);
  background-size: clamp(40px, 8vw, 72px) clamp(40px, 8vw, 72px);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 78%);
}

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

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 40px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(32px, 7.2vw, 68px);
  line-height: 1.06;
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-hero__hl {
  color: var(--cyan);
  font-weight: 300;
}

.page-about .about-hero__deck {
  max-width: 58ch;
  margin: clamp(18px, 3vw, 26px) 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-hero__stamp {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 0 0 16px;
  border-left: 2px solid var(--orange);
}

.page-about .about-hero__year {
  font-family: var(--font-mono);
  font-size: clamp(40px, 10vw, 62px);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-hero__since {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
}

.page-about .about-origin__copy p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-origin__points {
  display: grid;
  gap: 0;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-origin__points li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 12px;
  align-items: baseline;
  padding: 12px 0;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.6;
}

.page-about .about-origin__points .mono {
  font-size: 12px;
  color: var(--orange);
  letter-spacing: 0.1em;
}

.page-about .about-origin__figure {
  margin: 0;
  border: 1px solid var(--line);
}

.page-about .about-origin__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 里程碑 ---------- */
.page-about .about-miles__sub {
  max-width: 56ch;
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-miles__body {
  display: grid;
  gap: clamp(20px, 4vw, 40px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .about-miles__rail {
  display: flex;
  gap: 10px;
  overflow-x: auto;
  padding-bottom: 10px;
}

.page-about .about-miles__node {
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  gap: 4px;
  min-width: 168px;
  padding: 12px 14px;
  text-align: left;
  cursor: pointer;
  background: var(--ink);
  border: 1px solid var(--line);
  border-left: 2px solid var(--line);
  border-radius: 2px;
  color: var(--text);
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.2s ease;
}

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

.page-about .about-miles__node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-miles__node[aria-selected="true"] {
  background: rgba(55, 242, 214, 0.07);
  border-left-color: var(--orange);
  border-color: var(--cyan);
}

.page-about .about-miles__year {
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-miles__node[aria-selected="true"] .about-miles__year {
  color: var(--orange);
}

.page-about .about-miles__name {
  font-size: 14px;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-miles__panel {
  padding: clamp(20px, 3.5vw, 34px);
  background: var(--ink);
  border: 1px solid var(--line);
  border-left: 3px solid var(--cyan);
}

.page-about .about-miles__meta {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--silver);
}

.page-about .about-miles__panel h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 3vw, 27px);
  letter-spacing: 0.02em;
  color: var(--paper);
}

.page-about .about-miles__panel p {
  margin: 0 0 12px;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-miles__result {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 18px 0 0 !important;
  padding-top: 14px;
  border-top: 1px dashed var(--line);
  font-size: 14px;
  color: var(--cyan);
}

/* ---------- 内容生产体系 ---------- */
.page-about .about-sys__deck {
  max-width: 58ch;
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-sys__grid {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  margin-top: clamp(26px, 4vw, 46px);
}

.page-about .about-sys__figure {
  margin: 0;
  border: 1px solid var(--line);
}

.page-about .about-sys__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

.page-about .about-sys__item {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.6vw, 24px);
  background: var(--panel);
  transition: background 0.2s ease;
}

.page-about .about-sys__item:hover {
  background: rgba(55, 242, 214, 0.05);
}

.page-about .about-sys__idx {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--violet);
}

.page-about .about-sys__item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-sys__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 团队与节奏 ---------- */
.page-about .about-rhythm__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-rhythm__main > p {
  max-width: 56ch;
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-rhythm__list {
  display: grid;
  gap: 0;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rhythm__list li {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-rhythm__k {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-rhythm__list p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
}

.page-about .about-rhythm__aside {
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--line);
  background: var(--ink);
}

.page-about .about-rhythm__aside-title {
  margin: 0 0 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--silver);
}

.page-about .about-stats {
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-about .about-stats__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-stats__row:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-stats dt {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.page-about .about-stats dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
  text-align: right;
}

.page-about .about-stats__num {
  font-size: clamp(22px, 3.4vw, 28px);
  font-weight: 400;
  color: var(--cyan);
  line-height: 1;
}

.page-about .about-stats__unit {
  font-size: 12px;
  color: var(--silver);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
}

.page-about .about-partners__figure {
  margin: 0;
  border: 1px solid var(--line);
}

.page-about .about-partners__figure img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-partners__copy > p {
  max-width: 56ch;
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-partners__list {
  display: grid;
  gap: 0;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partners__list li {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(14px, 3vw, 24px);
  align-items: start;
  padding: clamp(16px, 2.4vw, 22px) 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-partners__num {
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 300;
  line-height: 1;
  color: var(--violet);
}

.page-about .about-partners__list li:nth-child(2) .about-partners__num {
  color: var(--cyan);
}

.page-about .about-partners__list li:nth-child(3) .about-partners__num {
  color: var(--orange);
}

.page-about .about-partners__list h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-partners__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach__band {
  display: grid;
  gap: clamp(20px, 3.5vw, 40px);
  padding: clamp(24px, 4vw, 44px);
  border: 1px solid var(--line);
  background:
    linear-gradient(118deg, rgba(255, 90, 54, 0.16) 0%, rgba(13, 27, 46, 0.92) 42%, rgba(55, 242, 214, 0.14) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 26px), calc(100% - 26px) 100%, 0 100%);
}

.page-about .about-reach__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(56px, 14vw, 112px);
  font-weight: 200;
  line-height: 0.92;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .about-reach__cap {
  margin: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--silver);
}

.page-about .about-reach__text p {
  max-width: 58ch;
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

/* ---------- 为什么选我们 ---------- */
.page-about .about-why__list {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
  margin: clamp(24px, 4vw, 40px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-why__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: clamp(14px, 3vw, 26px);
  align-items: start;
  padding: clamp(18px, 3vw, 26px) clamp(16px, 3vw, 28px);
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 3px solid var(--orange);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

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

.page-about .about-why__idx {
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 300;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-why__item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.06em;
  color: var(--paper);
}

.page-about .about-why__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 联系与合作 ---------- */
.page-about .about-cta__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-cta__lead > p {
  max-width: 56ch;
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-cta__links {
  margin: 16px 0 0;
  font-size: 14px;
  color: var(--silver);
}

.page-about .about-cta__links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(55, 242, 214, 0.4);
  margin: 0 4px;
}

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

.page-about .about-cta__card {
  padding: clamp(20px, 3vw, 28px);
  background: var(--ink);
  border: 1px solid var(--line);
}

.page-about .about-cta__list {
  display: grid;
  gap: 0;
  margin: 0;
}

.page-about .about-cta__list > div {
  display: grid;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-cta__list > div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-cta__list dt {
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--silver);
}

.page-about .about-cta__list dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .about-cta__list dd.mono {
  font-size: 14px;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) clamp(170px, 20vw, 230px);
    align-items: end;
  }

  .page-about .about-hero__stamp {
    align-items: flex-start;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-miles__body {
    grid-template-columns: minmax(220px, 280px) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-miles__rail {
    flex-direction: column;
    overflow: visible;
    padding: 0 0 0 22px;
    position: relative;
  }

  .page-about .about-miles__rail::before {
    content: "";
    position: absolute;
    left: 6px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(180deg, var(--cyan), var(--line) 70%);
  }

  .page-about .about-miles__node {
    min-width: 0;
    width: 100%;
    position: relative;
  }

  .page-about .about-miles__node::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 20px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink);
    border: 1px solid var(--cyan);
    transition: background 0.2s ease;
  }

  .page-about .about-miles__node[aria-selected="true"]::before {
    background: var(--orange);
    border-color: var(--orange);
  }

  .page-about .about-sys__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .about-rhythm__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: start;
  }

  .page-about .about-rhythm__aside {
    position: sticky;
    top: 96px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: center;
  }

  .page-about .about-reach__band {
    grid-template-columns: minmax(0, 0.55fr) minmax(0, 1.45fr);
    align-items: center;
  }

  .page-about .about-why__item:nth-child(even) {
    margin-left: clamp(0px, 6vw, 76px);
  }

  .page-about .about-cta__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-miles__node,
  .page-about .about-sys__item,
  .page-about .about-why__item {
    transition: none;
  }

  .page-about .about-miles__node:hover,
  .page-about .about-why__item:hover {
    transform: none;
  }
}