.page-about {
  background: var(--mist);
  color: var(--graphite);
}

.page-about .head {
  max-width: 64ch;
  margin-bottom: clamp(24px, 3.4vw, 44px);
}

.page-about .head__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--soil);
  margin: 0 0 10px;
}

.page-about .head__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(27px, 4.2vw, 48px);
  line-height: 0.98;
  letter-spacing: -0.01em;
  margin: 0;
  color: var(--graphite);
}

.page-about .head__lede {
  margin: 14px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--ink-soft);
  max-width: 46ch;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--head-h) + 32px) 0 clamp(56px, 7vw, 88px);
  background:
    linear-gradient(152deg, var(--soil-deep) 0%, var(--soil-deep) 46%, var(--forest-deep) 46.3%, var(--forest-deep) 100%);
  color: var(--mist);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: -54px;
  height: 104px;
  background: var(--flash);
  opacity: 0.14;
  transform: rotate(-2.4deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .about-hero .crumb {
  color: #B9C6C1;
}

.page-about .about-hero__eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--flash);
  margin: 18px 0 0;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(35px, 6.4vw, 76px);
  line-height: 0.9;
  letter-spacing: -0.015em;
  margin: 12px 0 0;
  color: #F4F7F5;
}

.page-about .about-hero__title b {
  font-weight: 700;
  color: var(--flash);
}

.page-about .about-hero__lede {
  margin: 20px 0 0;
  font-size: 16.5px;
  line-height: 1.82;
  color: #D3DCD8;
  max-width: 47ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  margin-top: 28px;
}

.page-about .hstat {
  border-top: 1px solid rgba(238, 241, 243, 0.22);
  padding-top: 10px;
}

.page-about .hstat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(19px, 2.6vw, 27px);
  letter-spacing: 0.02em;
  color: var(--flash);
}

.page-about .hstat__key {
  display: block;
  margin-top: 3px;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: #A9B8B3;
}

.page-about .about-hero__media {
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: 0 28px 62px -30px rgba(0, 0, 0, 0.7);
}

.page-about .about-hero__media::before {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 52%;
  background: linear-gradient(to top, rgba(14, 59, 42, 0.74), rgba(14, 59, 42, 0));
  z-index: 1;
  pointer-events: none;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 8.5;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.06);
}

/* ---------- 团队是谁 ---------- */

.page-about .about-people {
  padding: clamp(54px, 7vw, 102px) 0 clamp(46px, 6vw, 86px);
}

.page-about .about-people__grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 46px);
}

.page-about .roles {
  display: grid;
  gap: 14px;
}

.page-about .role {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  padding: 16px 18px 18px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease, transform 0.2s ease;
}

.page-about .role:hover,
.page-about .role:focus-within {
  border-color: var(--soil);
  box-shadow: 0 16px 34px -24px rgba(28, 34, 38, 0.6);
  transform: translateX(4px);
}

.page-about .role__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .role__name {
  font-size: 17px;
  font-weight: 600;
  color: var(--graphite);
}

.page-about .role__pct {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--soil);
}

.page-about .role__track {
  margin-top: 10px;
  height: 6px;
  border-radius: var(--r-pill);
  background: var(--mist);
  overflow: hidden;
}

.page-about .role__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--soil), var(--forest));
  transition: width 0.4s ease;
}

.page-about .role:nth-child(1) .role__fill { width: 35%; }
.page-about .role:nth-child(2) .role__fill { width: 30%; }
.page-about .role:nth-child(3) .role__fill { width: 20%; }
.page-about .role:nth-child(4) .role__fill { width: 15%; }

.page-about .role__duty {
  margin: 11px 0 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-mute);
  transition: color 0.2s ease;
}

.page-about .role:hover .role__duty,
.page-about .role:focus-within .role__duty {
  color: var(--graphite);
}

.page-about .people-note {
  border-radius: var(--r-lg);
  background: var(--forest-deep);
  color: var(--mist);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .people-note__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(32px, 5vw, 50px);
  line-height: 1;
  color: var(--flash);
}

.page-about .people-note__key {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: #9FB8AE;
}

.page-about .people-note p {
  margin: 16px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #CFDAD5;
}

/* ---------- 叙事段 ---------- */

.page-about .about-story {
  position: relative;
  overflow: hidden;
  padding: clamp(54px, 7.5vw, 116px) 0;
  background: linear-gradient(180deg, var(--mist) 0%, #E2E8E9 56%, var(--mist) 100%);
}

.page-about .about-story::before {
  content: "";
  position: absolute;
  left: -150px;
  top: 10%;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 32%, rgba(242, 226, 60, 0.34), rgba(242, 226, 60, 0) 70%);
  pointer-events: none;
}

.page-about .about-story__inner {
  position: relative;
  z-index: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 0 var(--gap);
}

.page-about .about-story__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--soil);
  margin: 0;
}

.page-about .about-story__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(26px, 3.9vw, 47px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 14px 0 24px;
  color: var(--graphite);
}

.page-about .about-story__title span {
  font-weight: 700;
  color: var(--soil);
}

.page-about .about-story .prose {
  font-size: 16.5px;
  line-height: 1.86;
  color: var(--ink-soft);
}

.page-about .about-story .prose p {
  margin: 0;
  max-width: 38em;
}

.page-about .about-story .prose p + p {
  margin-top: 18px;
}

/* ---------- 生产节奏 ---------- */

.page-about .about-rhythm {
  padding: clamp(48px, 6.5vw, 96px) 0;
}

.page-about .rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .rhythm__item {
  border: 1px solid var(--line);
  border-top: 4px solid var(--soil);
  border-radius: var(--r-md);
  background: #fff;
  padding: 22px 20px 24px;
  transition: box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .rhythm__item:nth-child(2) { border-top-color: var(--forest); }
.page-about .rhythm__item:nth-child(3) { border-top-color: var(--tech); }

.page-about .rhythm__item:hover {
  box-shadow: 0 20px 42px -30px rgba(28, 34, 38, 0.65);
}

.page-about .rhythm__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--ink-mute);
  margin: 0;
}

.page-about .rhythm__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.2;
  margin: 12px 0 10px;
  color: var(--graphite);
}

.page-about .rhythm__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ink-soft);
}

/* ---------- 数据整理 ---------- */

.page-about .about-pipeline {
  padding: clamp(50px, 6.8vw, 102px) 0;
  background: var(--forest-deep);
  color: var(--mist);
}

.page-about .about-pipeline__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-pipeline .head__index { color: var(--flash); }
.page-about .about-pipeline .head__title { color: #F4F7F5; }
.page-about .about-pipeline .head__lede { color: #B7C8C1; }

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  padding: 16px 18px;
  border-radius: var(--r-md);
  background: rgba(238, 241, 243, 0.06);
  border: 1px solid rgba(238, 241, 243, 0.16);
  transition: background 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
}

.page-about .flow__step:hover,
.page-about .flow__step:focus-within {
  background: rgba(242, 226, 60, 0.1);
  border-color: var(--flash);
  transform: translateX(4px);
}

.page-about .flow__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--flash);
  padding-top: 3px;
}

.page-about .flow__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: #F2F6F4;
}

.page-about .flow__text {
  margin: 7px 0 0;
  font-size: 14.5px;
  line-height: 1.74;
  color: #BCCDC6;
}

.page-about .about-pipeline__media {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid rgba(238, 241, 243, 0.14);
}

.page-about .about-pipeline__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.06);
}

/* ---------- 双端历程 ---------- */

.page-about .about-roadmap {
  padding: clamp(52px, 7vw, 104px) 0;
}

.page-about .about-roadmap__head {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

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

.page-about .about-roadmap__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
  border-radius: var(--r-lg);
  filter: saturate(0.95) contrast(1.04);
}

.page-about .about-roadmap__figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--ink-mute);
}

.page-about .tl {
  list-style: none;
  margin: clamp(32px, 4.6vw, 62px) 0 0;
  padding: 0;
  position: relative;
  display: grid;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--soil), var(--forest) 55%, var(--tech));
  opacity: 0.34;
}

.page-about .tl__item {
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 0 16px;
  position: relative;
  padding: 18px 0 26px;
}

.page-about .tl__marker {
  grid-column: 1;
  grid-row: 1;
  width: 12px;
  height: 12px;
  margin: 6px 0 0 3px;
  border-radius: 50%;
  background: var(--graphite);
  border: 2px solid var(--flash);
  box-shadow: 0 0 0 4px rgba(242, 226, 60, 0.18);
  position: relative;
  z-index: 1;
}

.page-about .tl__phase { grid-column: 2; }
.page-about .tl__detail { grid-column: 2; }

.page-about .tl__era {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--soil);
  margin: 0;
}

.page-about .tl__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.2vw, 26px);
  line-height: 1.18;
  margin: 8px 0 0;
  color: var(--graphite);
}

.page-about .tl__text {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ink-soft);
  max-width: 58ch;
}

.page-about .tl__more {
  margin-top: 14px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: #fff;
  overflow: hidden;
}

.page-about .tl__more summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 11px 16px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--forest);
}

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

.page-about .tl__more summary::before {
  content: "+";
  font-family: var(--font-mono);
  color: var(--soil);
}

.page-about .tl__more[open] summary::before { content: "–"; }

.page-about .tl__more summary:focus-visible {
  outline: 2px solid var(--flash);
  outline-offset: -2px;
}

.page-about .tl__more ul {
  margin: 0;
  padding: 0 18px 16px 34px;
  display: grid;
  gap: 7px;
}

.page-about .tl__more li {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* ---------- 支持渠道 ---------- */

.page-about .about-support {
  padding: clamp(52px, 7vw, 104px) 0;
  background: linear-gradient(158deg, var(--soil-deep) 0%, var(--soil) 58%, var(--soil-deep) 100%);
  color: var(--mist);
}

.page-about .about-support__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-support .head__index { color: var(--flash); }
.page-about .about-support .head__title { color: #FBF7F3; }

.page-about .about-support__lede {
  margin: 14px 0 0;
  font-size: 16px;
  line-height: 1.82;
  color: #F0DCD6;
  max-width: 46ch;
}

.page-about .about-support__links {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-support__links a {
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border-radius: var(--r-pill);
  border: 1px solid rgba(238, 241, 243, 0.4);
  color: #FBF7F3;
  font-size: 14px;
  text-decoration: none;
  transition: background 0.18s ease, color 0.18s ease, border-color 0.18s ease;
}

.page-about .about-support__links a:hover {
  background: var(--flash);
  border-color: var(--flash);
  color: var(--graphite);
}

.page-about .about-support__links a:focus-visible {
  outline: 2px solid var(--flash);
  outline-offset: 2px;
}

.page-about .contact-cards {
  display: grid;
  gap: 14px;
}

.page-about .ccard {
  border-radius: var(--r-md);
  padding: 18px 20px;
  background: rgba(238, 241, 243, 0.08);
  border: 1px solid rgba(238, 241, 243, 0.22);
}

.page-about .ccard__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--flash);
  margin: 0 0 8px;
}

.page-about .ccard__val {
  margin: 0;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.6;
  color: #FBF7F3;
  word-break: break-word;
}

.page-about .ccard__note {
  margin: 9px 0 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: #EFD9D3;
}

/* ---------- 断点 ---------- */

@media (min-width: 560px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 880px) {
  .page-about .tl__item {
    grid-template-columns: 22px 250px minmax(0, 1fr);
    gap: 0 28px;
    align-items: start;
    padding: 22px 0 30px;
  }

  .page-about .tl__marker { grid-column: 1; grid-row: 1; }
  .page-about .tl__phase { grid-column: 2; }
  .page-about .tl__detail { grid-column: 3; }
  .page-about .tl__text { margin-top: 0; }
}

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.08fr 0.92fr;
  }

  .page-about .about-people__grid {
    grid-template-columns: 1.35fr 0.65fr;
  }

  .page-about .about-pipeline__grid {
    grid-template-columns: 1fr 0.82fr;
    align-items: center;
  }

  .page-about .about-roadmap__head {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: end;
  }

  .page-about .about-support__grid {
    grid-template-columns: 1fr 0.95fr;
  }

  .page-about .rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 22px;
    padding-bottom: 34px;
  }

  .page-about .rhythm > :nth-child(2) { transform: translateY(30px); }
  .page-about .rhythm > :nth-child(3) { transform: translateY(-12px); }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role,
  .page-about .flow__step,
  .page-about .rhythm__item,
  .page-about .role__fill,
  .page-about .about-support__links a {
    transition: none;
  }

  .page-about .role:hover,
  .page-about .role:focus-within,
  .page-about .flow__step:hover,
  .page-about .flow__step:focus-within {
    transform: none;
  }
}