.page-about {
  display: block;
  position: relative;
  background: var(--ink);
  color: var(--cream);
  overflow-x: hidden;
  padding-bottom: 64px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: 24px 0 44px;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -160px;
  right: -90px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(61, 242, 192, 0.14), transparent 68%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
  margin-top: 26px;
}

.page-about .about-hero__lead h1 {
  margin: 10px 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 32px;
  line-height: 1.24;
  letter-spacing: -0.015em;
  color: var(--white);
}

.page-about .about-hero__lead .wg-lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--cream);
  margin: 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--card);
  padding: 16px 18px 18px;
}

.page-about .about-stat dt {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--rock);
}

.page-about .about-stat dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 27px;
  font-weight: 500;
  line-height: 1.05;
  letter-spacing: 0.01em;
  color: var(--white);
}

.page-about .about-stat__unit {
  margin-left: 3px;
  font-family: var(--font-body);
  font-size: 12.5px;
  font-weight: 400;
  color: var(--rock);
}

/* ---------- 章节标题 ---------- */

.page-about .about-story {
  padding-top: 40px;
  border-top: 1px solid var(--line);
}

.page-about .about-story__head {
  margin-bottom: 34px;
}

.page-about .about-story__head h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 26px;
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--white);
}

/* ---------- 时间轴 ---------- */

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

.page-about .tl-node {
  position: relative;
  padding-bottom: 56px;
}

.page-about .tl-node:last-child {
  padding-bottom: 0;
}

.page-about .tl-node__dot {
  position: absolute;
  left: 0;
  top: 9px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--clay);
  box-shadow: 0 0 0 5px var(--ink), 0 0 0 6px var(--line-strong);
  z-index: 1;
}

.page-about .tl-node::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 31px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--line-strong), rgba(154, 167, 184, 0.06));
}

.page-about .tl-node:last-child::before {
  display: none;
}

.page-about .tl-node__inner {
  padding-left: 34px;
}

.page-about .tl-node__mark {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin: 0 0 12px;
}

.page-about .tl-node__mark-num {
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 500;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--amber);
}

.page-about .tl-node__mark-unit {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--rock);
}

.page-about .tl-node__inner h3 {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 21px;
  line-height: 1.36;
  color: var(--white);
}

.page-about .tl-node__quote {
  margin: 0 0 20px;
  padding-left: 16px;
  border-left: 2px solid var(--clay);
  font-family: var(--font-serif);
  font-size: 16.5px;
  line-height: 1.72;
  color: var(--signal-soft);
}

.page-about .tl-node__inner p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cream);
}

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

.page-about .tl-node__inner a {
  color: var(--signal);
  text-decoration: none;
  border-bottom: 1px solid rgba(61, 242, 192, 0.4);
  padding-bottom: 1px;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .tl-node__inner a:hover,
.page-about .tl-node__inner a:focus-visible {
  color: var(--signal-soft);
  border-bottom-color: var(--signal-soft);
}

.page-about .tl-node__grid {
  display: grid;
  gap: 24px;
}

.page-about .tl-node__figure {
  margin: 0;
}

.page-about .tl-node__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
}

.page-about .tl-node__figure--wide {
  margin-top: 22px;
}

.page-about .tl-node__figure--wide img {
  border-radius: var(--radius-l);
  box-shadow: 0 0 46px rgba(61, 242, 192, 0.09);
}

.page-about .tl-node__tail {
  margin-top: 6px;
  padding-top: 18px;
  border-top: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.85;
  color: var(--rock);
}

/* ---------- 团队条形图 ---------- */

.page-about .team-bars {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: 72px 1fr 42px;
  align-items: center;
  gap: 12px;
  font-size: 13.5px;
  color: var(--rock);
}

.page-about .team-bar__track {
  display: block;
  height: 10px;
  border-radius: 6px;
  background: var(--card);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  border-radius: 6px;
  background: linear-gradient(90deg, rgba(61, 242, 192, 0.42), var(--signal));
}

.page-about .team-bar--a .team-bar__fill { width: 56.25%; }
.page-about .team-bar--b .team-bar__fill { width: 28.125%; }
.page-about .team-bar--c .team-bar__fill { width: 15.625%; }

.page-about .team-bar__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 500;
  text-align: right;
  color: var(--amber);
}

/* ---------- 固定动作清单 ---------- */

.page-about .ritual-list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .ritual-item {
  display: grid;
  grid-template-columns: 26px 1fr;
  gap: 14px;
  padding: 16px 18px 18px;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
}

.page-about .ritual-item__idx {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 500;
  color: var(--signal);
  padding-top: 3px;
}

.page-about .ritual-item h4 {
  margin: 0 0 7px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .ritual-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--cream);
}

/* ---------- 合作标签 ---------- */

.page-about .eco-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 22px 0 0;
  padding: 0;
}

.page-about .eco-tags li {
  padding: 6px 13px;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--rock);
  background: rgba(23, 44, 74, 0.5);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding-top: 56px;
}

.page-about .about-cta__box {
  position: relative;
  padding: 30px 22px 28px;
  border-radius: var(--radius-l);
  border: 1px solid var(--line-strong);
  background:
    linear-gradient(135deg, rgba(23, 44, 74, 0.92), rgba(16, 32, 58, 0.86));
  box-shadow: inset 0 0 0 1px rgba(61, 242, 192, 0.05);
}

.page-about .about-cta__text h2 {
  margin: 0 0 12px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 22px;
  line-height: 1.34;
  color: var(--white);
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--cream);
}

.page-about .about-cta__actions {
  margin-top: 22px;
  gap: 12px;
}

/* ---------- 中屏 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 30px 0 52px;
  }

  .page-about .about-hero__lead h1 {
    font-size: 40px;
  }

  .page-about .about-stat dd {
    font-size: 30px;
  }

  .page-about .about-story__head h2 {
    font-size: 30px;
  }

  .page-about .tl-node__mark-num {
    font-size: 32px;
  }

  .page-about .tl-node__inner h3 {
    font-size: 24px;
  }

  .page-about .tl-node__inner p {
    font-size: 17px;
  }

  .page-about .about-cta__box {
    padding: 36px 34px 34px;
  }

  .page-about .about-cta__text h2 {
    font-size: 25px;
  }
}

/* ---------- 桌面端 ---------- */

@media (min-width: 900px) {
  .page-about {
    padding-bottom: 88px;
  }

  .page-about .about-hero {
    padding: 36px 0 64px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
    align-items: start;
    margin-top: 34px;
  }

  .page-about .about-hero__lead h1 {
    font-size: 52px;
    line-height: 1.16;
    margin: 12px 0 22px;
  }

  .page-about .about-hero__lead .wg-lede {
    font-size: 17px;
    max-width: 46ch;
  }

  .page-about .about-story {
    padding-top: 56px;
  }

  .page-about .about-story__head {
    margin-bottom: 46px;
  }

  .page-about .about-story__head h2 {
    font-size: 34px;
    max-width: 24ch;
  }

  .page-about .tl-node {
    padding-bottom: 72px;
  }

  .page-about .tl-node__inner {
    padding-left: 54px;
  }

  .page-about .tl-node__mark-num {
    font-size: 34px;
  }

  .page-about .tl-node__inner h3 {
    font-size: 26px;
    max-width: 30ch;
  }

  .page-about .tl-node__quote {
    font-size: 18px;
    max-width: 40ch;
    margin-bottom: 24px;
  }

  .page-about .tl-node__inner p {
    max-width: 62ch;
  }

  .page-about .tl-node__grid {
    grid-template-columns: 7fr 5fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .tl-node__grid--flip {
    grid-template-columns: 5fr 7fr;
  }

  .page-about .tl-node__figure--wide {
    margin-top: 30px;
  }

  .page-about .ritual-list {
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
  }

  .page-about .ritual-item:first-child {
    grid-column: 1 / -1;
  }

  .page-about .about-cta__box {
    display: grid;
    grid-template-columns: 7fr 5fr;
    gap: 40px;
    align-items: center;
    padding: 40px 40px 38px;
  }

  .page-about .about-cta__actions {
    margin-top: 0;
    justify-content: flex-end;
  }
}

/* ---------- 大屏 ---------- */

@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    gap: 64px;
  }

  .page-about .about-hero__lead h1 {
    font-size: 56px;
  }

  .page-about .about-stat dd {
    font-size: 32px;
  }

  .page-about .ritual-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .ritual-item:first-child {
    grid-column: auto;
  }
}

/* ---------- 降低动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-node__inner a,
  .page-about .team-bar__fill {
    transition: none;
  }
}
</main>