.page-about {
  --about-glow: rgba(123, 47, 255, 0.16);
  background: var(--color-bg);
  color: var(--color-text);
  overflow-x: clip;
}

.page-about .about-wrap {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 16px;
}

/* ===== 首屏框架 ===== */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: 640px;
  padding: 110px 0 52px;
  isolation: isolate;
  overflow: hidden;
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-hero__img {
  position: absolute;
  inset: 0;
  z-index: -2;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    radial-gradient(720px 320px at 82% 18%, rgba(123, 47, 255, 0.22), transparent 70%),
    linear-gradient(180deg, rgba(11, 16, 38, 0.92) 0%, rgba(11, 16, 38, 0.7) 45%, rgba(26, 31, 61, 0.96) 100%);
}

.page-about .about-hero__beam {
  position: absolute;
  left: -6%;
  bottom: 12%;
  width: 112%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-primary), transparent);
  transform: rotate(-4deg);
  opacity: 0.75;
  pointer-events: none;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-hero .breadcrumb a {
  color: var(--color-silver);
}

.page-about .about-hero .breadcrumb [aria-current="page"] {
  color: var(--color-primary);
}

.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--color-silver);
  opacity: 0.55;
}

.page-about .about-hero__kicker {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.86rem;
  letter-spacing: 0.22em;
  color: var(--color-primary);
}

.page-about .about-hero h1 {
  margin: 0 0 26px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5.2vw, 4.4rem);
  line-height: 1.08;
  letter-spacing: 0.015em;
  transform: skew(-3deg);
}

.page-about .about-hero__lead {
  max-width: 700px;
  margin: 0 0 40px;
  font-size: 1.02rem;
  line-height: 1.9;
  color: var(--color-muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2px;
  margin: 0;
  background: rgba(255, 255, 255, 0.04);
  border-top: 1px solid var(--border-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column-reverse;
  gap: 8px;
  padding: 20px 12px 18px 0;
}

.page-about .about-stat dt,
.page-about .about-stat dd {
  margin: 0;
}

.page-about .about-stat__label {
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  color: var(--color-muted);
  text-transform: uppercase;
}

.page-about .about-stat__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 5vw, 3rem);
  line-height: 1;
  color: var(--color-text);
}

.page-about .about-stat__num small {
  font-size: 0.42em;
  color: var(--color-accent);
  margin-left: 3px;
}

/* ===== 本页目录条 ===== */
.page-about .about-toc {
  position: relative;
  z-index: 4;
  background: rgba(26, 31, 61, 0.86);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-toc .about-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 26px;
  padding-block: 13px;
}

.page-about .about-toc__label {
  font-family: var(--font-display);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  padding-top: 4px;
}

.page-about .about-toc a {
  display: inline-flex;
  gap: 7px;
  align-items: baseline;
  padding: 4px 0;
  font-size: 0.92rem;
  color: var(--color-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about .about-toc a:hover {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}

.page-about .about-toc__n {
  font-family: var(--font-display);
  font-weight: 700;
  color: var(--color-primary);
}

/* ===== 章节通用 ===== */
.page-about .about-sec-head {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  margin-bottom: 50px;
}

.page-about .about-sec-index {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  height: 36px;
  min-width: 48px;
  padding: 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 0.94rem;
  color: var(--color-accent);
  border: 1px solid rgba(255, 77, 46, 0.48);
  border-radius: var(--radius-md);
  transform: skew(-8deg);
}

.page-about .about-kicker {
  margin: 4px 0 12px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.84rem;
  letter-spacing: 0.2em;
  color: var(--color-primary);
  text-transform: uppercase;
}

.page-about .about-sec-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 4.2vw, 3rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
}

/* ===== 01 品牌定位 ===== */
.page-about .about-pos {
  position: relative;
  padding: 110px 0 90px;
  background:
    radial-gradient(680px 400px at 88% 8%, var(--about-glow), transparent 70%),
    linear-gradient(180deg, rgba(11, 16, 38, 0.4), rgba(26, 31, 61, 0.5));
}

.page-about .about-pos::before {
  content: 'POSITION';
  position: absolute;
  top: 38px;
  right: 24px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.8rem, 9vw, 6.5rem);
  line-height: 1;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.04);
  pointer-events: none;
}

.page-about .about-pos__grid {
  position: relative;
  display: grid;
  gap: 34px;
}

.page-about .about-pos__head .about-kicker {
  margin-top: 8px;
}

.page-about .about-pos__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.9rem, 4.6vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: 0.01em;
}

.page-about .about-pos__body {
  display: grid;
  gap: 20px;
}

.page-about .about-pos__body p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.98rem;
  line-height: 1.9;
}

.page-about .about-pos__body .about-pos__lead {
  color: var(--color-text);
  font-size: 1.12rem;
}

.page-about .about-pos__map {
  width: 100%;
  max-width: 640px;
  margin-inline: auto;
}

.page-about .about-pos__map svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-pos__labels text {
  font-family: var(--font-body);
  font-size: 13px;
  letter-spacing: 0.12em;
  fill: var(--color-silver);
}

.page-about .about-pos__center text {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.16em;
  fill: var(--color-text);
}

/* ===== 02 发展轨迹 ===== */
.page-about .about-road {
  position: relative;
  padding: 110px 0;
  background: rgba(26, 31, 61, 0.5);
  border-top: 1px solid var(--border-line);
}

.page-about .about-road::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 36%;
  height: 360px;
  background: linear-gradient(120deg, rgba(123, 47, 255, 0.09), transparent 60%);
  transform: skewY(-3deg);
  pointer-events: none;
}

.page-about .about-road__grid {
  position: relative;
  display: grid;
  gap: 54px;
  margin-top: 8px;
}

.page-about .about-road__media {
  max-width: 440px;
  margin-inline: auto;
}

.page-about .about-road__media img {
  display: block;
  width: 100%;
  max-height: 620px;
  height: auto;
  object-fit: cover;
  object-position: center;
  border-radius: var(--radius-md);
  -webkit-mask-image: linear-gradient(to bottom, #000, rgba(0, 0, 0, 0.2) 90%);
  mask-image: linear-gradient(to bottom, #000, rgba(0, 0, 0, 0.2) 90%);
}

.page-about .about-road__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 12px 0 0;
}

.page-about .about-road__list::before {
  content: '';
  position: absolute;
  left: 18px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, transparent, var(--color-primary) 10%, var(--color-primary) 72%, rgba(123, 47, 255, 0.15) 100%);
  transform: rotate(2.5deg);
  transform-origin: top center;
  opacity: 0.85;
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 54px 64px;
}

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

.page-about .about-tl-item::before {
  content: '';
  position: absolute;
  left: 13px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--color-bg);
  border: 2px solid var(--color-primary);
  border-radius: 50%;
  box-shadow: 0 0 0 4px rgba(123, 47, 255, 0.16);
}

.page-about .about-tl-item:hover::before {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(255, 77, 46, 0.18);
}

.page-about .about-tl-item__year {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.4rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--color-accent);
}

.page-about .about-tl-item__year small {
  font-size: 0.4em;
  color: var(--color-primary);
}

.page-about .about-tl-item h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 1.16rem;
  letter-spacing: 0.04em;
}

.page-about .about-tl-item p {
  margin: 0;
  max-width: 520px;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.85;
}

/* ===== 03 资质与荣誉 ===== */
.page-about .about-qual {
  position: relative;
  padding: 110px 0;
  overflow: hidden;
}

.page-about .about-qual::before {
  content: '';
  position: absolute;
  right: -18%;
  top: 6%;
  width: 48%;
  height: 125%;
  background: linear-gradient(205deg, rgba(123, 47, 255, 0.2), transparent 68%);
  transform: skewX(-12deg);
  pointer-events: none;
}

.page-about .about-qual__img {
  position: absolute;
  right: -120px;
  bottom: -50px;
  width: min(52vw, 400px);
  height: auto;
  opacity: 0.32;
  mix-blend-mode: screen;
  pointer-events: none;
}

.page-about .about-qual__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border-line);
}

.page-about .about-qual-item {
  padding: 30px 0;
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-qual-item__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.4rem, 8vw, 4.4rem);
  line-height: 1;
  color: var(--color-primary);
  text-shadow: 0 0 24px rgba(123, 47, 255, 0.35);
}

.page-about .about-qual-item__num small {
  font-size: 0.38em;
  color: var(--color-accent);
  margin-left: 4px;
}

.page-about .about-qual-item h3 {
  margin: 14px 0 8px;
  font-family: var(--font-display);
  font-size: 1.26rem;
  letter-spacing: 0.03em;
}

.page-about .about-qual-item p {
  margin: 0;
  max-width: 480px;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.85;
}

/* ===== 04 合作生态 ===== */
.page-about .about-eco {
  position: relative;
  padding: 110px 0;
  background:
    linear-gradient(115deg, rgba(123, 47, 255, 0.13), transparent 52%),
    var(--color-surface);
  border-top: 1px solid var(--border-line);
}

.page-about .about-eco__intro {
  max-width: 720px;
  margin-bottom: 40px;
}

.page-about .about-eco__intro p {
  margin: 0;
  color: var(--color-muted);
  font-size: 1.02rem;
  line-height: 1.9;
}

.page-about .about-eco__list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border-line);
}

.page-about .about-eco-item {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px 20px;
  padding: 30px 0;
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-eco-item__icon {
  grid-row: span 2;
  display: inline-flex;
  justify-content: center;
  align-items: flex-start;
  padding-top: 4px;
}

.page-about .about-eco-item__icon svg {
  width: 36px;
  height: 36px;
  transition: transform 0.35s var(--ease-out);
}

.page-about .about-eco-item:hover .about-eco-item__icon svg {
  transform: scale(1.08) rotate(-5deg);
}

.page-about .about-eco-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.14rem;
  letter-spacing: 0.04em;
}

.page-about .about-eco-item p {
  margin: 0;
  color: var(--color-muted);
  font-size: 0.95rem;
  line-height: 1.8;
}

.page-about .about-eco-item__link {
  grid-column: 2;
  justify-self: start;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--color-accent);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(255, 77, 46, 0.42);
}

.page-about .about-eco-item__link:hover {
  color: var(--color-text);
  border-bottom-color: var(--color-primary);
}

/* ===== 05 内容目录 ===== */
.page-about .about-index {
  position: relative;
  padding: 120px 0 140px;
  overflow: hidden;
  background:
    radial-gradient(640px 380px at 10% 82%, rgba(123, 47, 255, 0.12), transparent 70%),
    var(--color-bg);
}

.page-about .about-index::after {
  content: 'DIRECTORY';
  position: absolute;
  right: -8px;
  bottom: 30px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(4rem, 15vw, 11rem);
  line-height: 1;
  letter-spacing: 0.08em;
  color: rgba(192, 196, 208, 0.07);
  -webkit-text-stroke: 1px rgba(192, 196, 208, 0.1);
  pointer-events: none;
  white-space: nowrap;
}

.page-about .about-index__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--border-line);
}

.page-about .about-index-item {
  position: relative;
  display: grid;
  grid-template-columns: 52px 1fr;
  gap: 4px 18px;
  align-items: baseline;
  padding: 28px 0;
  border-bottom: 1px solid var(--border-line);
}

.page-about .about-index-item__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  color: var(--color-primary);
  line-height: 1.5;
}

.page-about .about-index-item__main a,
.page-about .about-index-item__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.28rem, 3vw, 1.9rem);
  letter-spacing: 0.03em;
  color: var(--color-text);
  text-decoration: none;
  padding-bottom: 3px;
  background-image: linear-gradient(120deg, var(--color-primary), var(--color-accent));
  background-repeat: no-repeat;
  background-size: 0% 2px;
  background-position: left calc(100% - 2px);
  transition: background-size 0.4s var(--ease-out);
}

.page-about .about-index-item__main a:hover {
  background-size: 100% 2px;
}

.page-about .about-index-item--current .about-index-item__main .about-index-item__title {
  background-size: 100% 2px;
}

.page-about .about-index-item__main p {
  margin: 8px 0 0;
  max-width: 560px;
  color: var(--color-muted);
  font-size: 0.92rem;
  line-height: 1.75;
}

.page-about .about-index-item__flag {
  position: absolute;
  top: 32px;
  right: 0;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
  border: 1px solid rgba(255, 77, 46, 0.5);
  border-radius: 30px;
  padding: 4px 12px;
}

/* ===== 下一板块跳转 ===== */
.page-about .about-next {
  position: relative;
  margin-top: 56px;
  border-top: 1px solid var(--border-line);
}

.page-about .about-next__link {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px 22px;
  padding: 26px 0 6px;
  text-decoration: none;
}

.page-about .about-next__label {
  font-family: var(--font-display);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--color-accent);
  text-transform: uppercase;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.6vw, 1.5rem);
  color: var(--color-text);
}

.page-about .about-next__arrow {
  margin-left: auto;
  font-size: 1.5rem;
  color: var(--color-primary);
  transition: transform 0.35s var(--ease-out);
}

.page-about .about-next__link:hover .about-next__arrow {
  transform: translateX(8px);
}

.page-about section[id],
.page-about .about-hero {
  scroll-margin-top: calc(var(--header-h) + 20px);
}

/* ===== 中等屏适配 ===== */
@media (min-width: 640px) {
  .page-about .about-wrap {
    padding-inline: 24px;
  }

  .page-about .about-hero {
    min-height: 680px;
  }

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

/* ===== 桌面适配 ===== */
@media (min-width: 900px) {
  .page-about .about-hero {
    min-height: 720px;
    padding-top: 150px;
    padding-bottom: 64px;
  }

  .page-about .about-pos {
    padding: 150px 0 120px;
  }

  .page-about .about-pos__grid {
    grid-template-columns: 5fr 7fr;
    column-gap: 72px;
  }

  .page-about .about-pos__map {
    grid-column: 1 / -1;
    margin-top: 18px;
  }

  .page-about .about-road {
    padding: 150px 0;
  }

  .page-about .about-road__grid {
    grid-template-columns: 5fr 7fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-road__media {
    margin-inline: 0;
  }

  .page-about .about-qual {
    padding: 150px 0;
  }

  .page-about .about-qual__list {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 56px;
    border-top: 0;
  }

  .page-about .about-qual-item {
    padding: 6px 0 0 28px;
    border-bottom: 0;
    border-left: 2px solid var(--border-line);
  }

  .page-about .about-qual-item:hover {
    border-left-color: var(--color-primary);
  }

  .page-about .about-eco {
    padding: 150px 0;
  }

  .page-about .about-eco-item {
    grid-template-columns: 56px minmax(0, 1fr) auto;
    padding-block: 34px;
  }

  .page-about .about-eco-item__icon {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .page-about .about-eco-item > div {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .about-eco-item__link {
    grid-column: 3;
    grid-row: 1 / span 2;
    justify-self: end;
    align-self: center;
  }

  .page-about .about-index {
    padding: 150px 0 180px;
  }

  .page-about .about-index__list {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    column-gap: 72px;
  }

  .page-about .about-index-item {
    padding-block: 34px;
  }

  .page-about .about-index-item__flag {
    top: 38px;
  }
}