.page-about {
  --about-mute: #A9BEB6;
  --about-line: rgba(138, 180, 255, 0.18);
  --about-card: #0B2E23;
  --about-stage: 96px;
  background: var(--turf);
  color: var(--white);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about * {
  box-sizing: border-box;
}

.page-about p {
  margin: 0;
}

/* ---------- 首屏斜切带 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  background: var(--night);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(118deg, var(--blue) 0%, #1a4fd0 100%);
  clip-path: polygon(64% -12%, 118% -12%, 118% 112%, 26% 112%);
  opacity: 0.42;
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  padding-top: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-crumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .about-crumb__link {
  color: var(--blue-soft);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease;
}

.page-about .about-crumb__link:hover {
  border-bottom-color: var(--blue-soft);
}

.page-about .about-crumb__sep {
  color: var(--slate);
}

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

.page-about .about-hero__kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(30px, 6.4vw, 56px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  max-width: 18ch;
}

.page-about .about-hero__lead {
  max-width: 56ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 1px;
  margin-top: clamp(6px, 1.4vw, 14px);
  max-width: 620px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-stat {
  display: grid;
  gap: 6px;
  align-content: start;
  padding: 14px 16px 16px;
  background: rgba(7, 33, 26, 0.86);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(28px, 4.4vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.55;
  color: var(--about-mute);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  clip-path: polygon(0 44px, 100% 0, 100% 100%, 0 100%);
  border-top: 1px solid var(--about-line);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-hero__caption {
  display: block;
  margin: 0 0 14px 16px;
  padding-left: 10px;
  border-left: 3px solid var(--orange);
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-mute);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 40px);
  padding-top: clamp(34px, 5vw, 64px);
  padding-bottom: clamp(52px, 8vw, 104px);
}

/* ---------- 左侧目录 ---------- */

.page-about .about-rail {
  border-top: 2px solid var(--orange);
  padding-top: 14px;
}

.page-about .about-rail__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: block;
  padding: 8px 12px;
  border-bottom: 2px solid rgba(138, 180, 255, 0.24);
  color: var(--slate);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.5;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-rail__link:hover {
  color: var(--mist);
}

.page-about .about-rail__link[aria-current="true"],
.page-about .about-rail__link[aria-current="location"] {
  color: var(--orange);
  border-bottom-color: var(--orange);
  font-weight: 700;
}

/* ---------- 章节 ---------- */

.page-about .about-sec + .about-sec {
  margin-top: clamp(46px, 7vw, 88px);
  padding-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--about-line);
}

.page-about .about-sec__no {
  display: inline-block;
  margin-bottom: 12px;
  padding: 4px 10px 4px 8px;
  border-left: 3px solid var(--blue);
  background: rgba(30, 107, 255, 0.16);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--blue-soft);
}

.page-about .about-sec__title {
  margin: 0 0 16px;
  font-family: var(--font-cn);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 32px);
  line-height: 1.26;
  letter-spacing: 0.01em;
  max-width: 22ch;
}

.page-about .about-sec__text {
  margin-bottom: 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-sec__foot {
  margin-top: 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--about-mute);
}

.page-about .about-inline {
  color: var(--blue-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(138, 180, 255, 0.5);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-inline:hover {
  color: var(--white);
  border-bottom-color: var(--orange);
}

/* ---------- 四条产品线 ---------- */

.page-about .about-lines {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .about-line {
  display: grid;
  gap: 8px;
  align-content: start;
  padding: 18px 18px 20px;
  background: rgba(7, 33, 26, 0.6);
}

.page-about .about-line__name {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 700;
  font-size: 17px;
  color: var(--white);
}

.page-about .about-line__name::before {
  content: "";
  display: inline-block;
  width: 6px;
  height: 6px;
  margin-right: 8px;
  vertical-align: 2px;
  background: var(--blue);
  transform: rotate(45deg);
}

.page-about .about-line__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-mute);
}

/* ---------- 数据路径 ---------- */

.page-about .flow {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .flow__step {
  padding: 20px 20px 22px;
  background: var(--about-card);
  border: 1px solid var(--about-line);
  border-left: 4px solid var(--blue);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .flow__step:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .flow__t {
  display: inline-block;
  margin-bottom: 10px;
  padding: 3px 10px;
  background: var(--blue-soft);
  color: var(--night);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
}

.page-about .flow__step:nth-child(3) .flow__t {
  background: var(--orange);
  color: var(--night);
}

.page-about .flow__h {
  margin: 0 0 8px;
  font-family: var(--font-cn);
  font-weight: 700;
  font-size: 18px;
  color: var(--white);
}

.page-about .flow__p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.72;
  color: var(--about-mute);
}

.page-about .about-figure {
  margin: 26px 0 0;
  padding: 10px;
  background: var(--night);
  border: 1px solid var(--about-line);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-figure__cap {
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--orange);
  font-size: 13px;
  line-height: 1.62;
  color: var(--about-mute);
}

/* ---------- 指标公式 ---------- */

.page-about .formula-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 22px 0;
}

.page-about .formula {
  display: grid;
  gap: 12px;
  align-content: start;
  padding: 20px 20px 22px;
  background: var(--mist);
  border: 1px solid #C6D7CF;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about .formula__name {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 700;
  font-size: 17px;
  letter-spacing: 0.02em;
  color: var(--turf);
}

.page-about .formula__expr {
  margin: 0;
  padding: 12px 14px;
  background: var(--white);
  border: 1px dashed rgba(30, 107, 255, 0.42);
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(13px, 1.9vw, 16px);
  line-height: 1.65;
  letter-spacing: -0.01em;
  color: var(--blue);
  overflow-wrap: anywhere;
}

.page-about .formula__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(7, 33, 26, 0.78);
}

/* ---------- 团队分工 ---------- */

.page-about .crew {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 24px;
}

.page-about .crew__card {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 22px 20px 24px;
  background: var(--about-card);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--orange);
  transition: border-top-color 0.25s ease, transform 0.25s ease;
}

.page-about .crew__card:hover {
  border-top-color: var(--orange-soft);
  transform: translateY(-3px);
}

.page-about .crew__num {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: clamp(34px, 5vw, 40px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--white);
}

.page-about .crew__num::after {
  content: " 人";
  margin-left: 4px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0;
  color: var(--slate);
}

.page-about .crew__name {
  margin: 0;
  font-family: var(--font-cn);
  font-weight: 700;
  font-size: 17px;
  color: var(--blue-soft);
}

.page-about .crew__list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .crew__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.68;
  color: var(--about-mute);
}

.page-about .crew__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  background: var(--green-ok);
  transform: rotate(45deg);
}

/* ---------- 赛季演进 ---------- */

.page-about .seasons {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  display: grid;
  gap: 22px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--blue), var(--orange));
  opacity: 0.55;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 7px;
  width: 12px;
  height: 12px;
  background: var(--night);
  border: 2px solid var(--blue);
  transform: rotate(45deg);
}

.page-about .timeline__item:last-child::before {
  background: var(--orange);
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.2);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 21px;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .timeline__item:last-child .timeline__year {
  color: var(--orange);
}

.page-about .timeline__desc {
  margin: 0;
  max-width: 46ch;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-mute);
}

.page-about .seasons__figure {
  margin: 0;
  padding: 10px;
  background: var(--night);
  border: 1px solid var(--about-line);
}

.page-about .seasons__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
}

.page-about .seasons__figure-cap {
  display: block;
  margin-top: 10px;
  padding-left: 10px;
  border-left: 2px solid var(--blue);
  font-size: 13px;
  line-height: 1.62;
  color: var(--about-mute);
}

/* ---------- 合作与地区 ---------- */

.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 24px 0 4px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .eco__cell {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: 22px 20px;
  background: var(--night);
}

.page-about .eco__num {
  font-family: var(--font-mono);
  font-weight: 800;
  font-size: 34px;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--orange);
}

.page-about .eco__label {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-mute);
}

.page-about .about-next {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 滚动显现（渐进增强） ---------- */

@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal].is-visible {
    animation: about-rise 0.55s ease both;
  }
}

@keyframes about-rise {
  from {
    opacity: 0;
    transform: translateY(12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ---------- 断点 ---------- */

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

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

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

  .page-about .about-hero__media {
    clip-path: polygon(0 70px, 100% 0, 100% 100%, 0 100%);
  }
}

@media (min-width: 780px) {
  .page-about .crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1000px) {
  .page-about .about-body {
    grid-template-columns: minmax(184px, 220px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 72px);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: var(--about-stage);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-rail__item {
    flex: 0 1 auto;
  }

  .page-about .about-rail__link {
    padding: 9px 0 9px 14px;
    border-bottom: 0;
    border-left: 2px solid rgba(138, 180, 255, 0.24);
    font-size: 14px;
    white-space: normal;
  }

  .page-about .about-rail__link[aria-current="true"],
  .page-about .about-rail__link[aria-current="location"] {
    border-bottom-color: transparent;
    border-left-color: var(--orange);
  }

  .page-about .seasons {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    gap: 32px;
    align-items: start;
  }

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

  .page-about .about-hero__media {
    clip-path: polygon(0 96px, 100% 0, 100% 100%, 0 100%);
  }
}