.page-about {
  --about-dye: linear-gradient(115deg, var(--tie) 0%, var(--tie-2) 46%, var(--cyan) 100%);
  --about-pad: clamp(16px, 4vw, 40px);
  --about-max: 1200px;
  --about-soft: rgba(245, 239, 225, 0.78);
  display: block;
  background: var(--ink);
  color: var(--paper);
  overflow-x: hidden;
}

/* ---------- 通用文本 ---------- */
.page-about .crumbs {
  margin: 0 0 22px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.page-about .crumbs a {
  color: var(--muted);
  text-decoration: none;
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--cyan);
  outline: none;
}
.page-about .crumbs [aria-current="page"] {
  color: var(--cyan);
}

.page-about .eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .prose {
  max-width: 62ch;
  font-size: 16.5px;
  line-height: 1.8;
  color: var(--about-soft);
}
.page-about .prose p {
  margin: 0 0 1.05em;
}
.page-about .prose p:last-child {
  margin-bottom: 0;
}
.page-about .prose a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.page-about .prose a:hover,
.page-about .prose a:focus-visible {
  color: var(--tie-2);
  outline: none;
}

/* ---------- 首屏 ---------- */
.about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(40px, 7vw, 96px) var(--about-pad) clamp(32px, 5vw, 60px);
  border-bottom: 1px solid var(--line);
}
.about-hero::before {
  content: "";
  position: absolute;
  top: -22%;
  right: -16%;
  width: min(74vw, 720px);
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 34% 34%, rgba(108, 92, 231, 0.42), transparent 60%),
    radial-gradient(circle at 68% 70%, rgba(34, 230, 211, 0.18), transparent 58%),
    radial-gradient(circle at 82% 14%, rgba(255, 107, 26, 0.16), transparent 55%);
  pointer-events: none;
  z-index: 0;
}
.about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--about-max);
  margin: 0 auto;
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}
.about-hero h1 {
  margin: 18px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 74px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  max-width: 16ch;
}
.about-hero .lede {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: clamp(15.5px, 1.6vw, 18px);
  line-height: 1.78;
  color: rgba(245, 239, 225, 0.84);
}
.about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

/* 速览卡 */
.about-snap {
  align-self: start;
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: clamp(20px, 3vw, 28px);
}
.about-snap__title {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}
.about-snap__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.about-snap__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 4px 8px;
  padding: 15px 0;
  border-bottom: 1px dashed var(--line);
}
.about-snap__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.about-snap__value {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}
.about-snap__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--cyan);
}
.about-snap__label {
  flex: 1 0 100%;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.about-hero__media {
  position: relative;
  z-index: 1;
  max-width: var(--about-max);
  margin: clamp(30px, 5vw, 56px) auto 0;
}
.about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节索引条 ---------- */
.about-index {
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
}
.about-index__inner {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: 0 var(--about-pad);
  display: flex;
  gap: 2px;
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}
.about-index__inner::-webkit-scrollbar {
  display: none;
}
.about-index__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 9px;
  padding: 17px 13px;
  font-size: 14px;
  color: var(--muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.about-index__link:hover,
.about-index__link:focus-visible {
  color: var(--paper);
  border-bottom-color: var(--cyan);
  outline: none;
}
.about-index__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

/* ---------- 章节 ---------- */
.about-chapter {
  position: relative;
  max-width: var(--about-max);
  margin: 0 auto;
  padding: clamp(52px, 8vw, 104px) var(--about-pad);
  display: grid;
  gap: clamp(18px, 3vw, 28px);
}
.about-chapter + .about-chapter::before {
  content: "";
  position: absolute;
  top: 0;
  left: var(--about-pad);
  right: var(--about-pad);
  height: 2px;
  background: var(--about-dye);
  opacity: 0.32;
}
.about-chapter__mark {
  display: flex;
  align-items: center;
  gap: 14px;
}
.about-chapter__index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(34px, 8vw, 56px);
  line-height: 1;
  letter-spacing: -0.04em;
  background: var(--about-dye);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.about-chapter__rule {
  flex: 1;
  height: 2px;
  background: var(--about-dye);
  opacity: 0.5;
}
.about-chapter__main {
  display: grid;
  gap: clamp(18px, 2.6vw, 28px);
  align-content: start;
  min-width: 0;
}
.about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}
.about-chapter h2 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(25px, 3.4vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  max-width: 24ch;
}

/* ---------- 场景 ---------- */
.about-scenes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.about-scene {
  border-top: 2px solid var(--line-strong);
  padding-top: 14px;
}
.about-scene__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan);
}
.about-scene__text {
  margin: 8px 0 0;
  font-size: 14.8px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 服务清单 ---------- */
.about-services {
  list-style: none;
  margin: 0;
  padding: 0;
  border: 1px solid var(--line);
}
.about-service {
  display: grid;
  gap: 12px;
  padding: clamp(18px, 2.6vw, 26px);
}
.about-service + .about-service {
  border-top: 1px solid var(--line);
}
.about-service__no {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}
.about-service__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--paper);
}
.about-service__text {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: 14.8px;
  line-height: 1.78;
  color: var(--about-soft);
}
.about-service__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

/* ---------- 时间轴 ---------- */
.about-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.about-track::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: var(--about-dye);
  opacity: 0.55;
}
.about-track__item {
  position: relative;
  padding: 0 0 26px 34px;
}
.about-track__item:last-child {
  padding-bottom: 0;
}
.about-track__dot {
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(34, 230, 211, 0.12);
  transition: background 0.25s ease;
}
.about-track__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}
.about-track__title {
  margin: 7px 0 0;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.about-track__text {
  margin: 7px 0 0;
  max-width: 56ch;
  font-size: 14.8px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 配图 ---------- */
.about-figure {
  margin: 0;
}
.about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: 1px solid var(--line);
  background: var(--ink-2);
}
.about-figure figcaption {
  margin-top: 11px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 流程步骤 ---------- */
.about-steps {
  display: grid;
  gap: 18px;
}
.about-step {
  border-left: 2px solid var(--line-strong);
  padding: 2px 0 2px 16px;
}
.about-step__name {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}
.about-step__text {
  margin: 7px 0 0;
  font-size: 14.8px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 规模数据 ---------- */
.about-metrics {
  display: grid;
  border: 1px solid var(--line);
}
.about-metric {
  background: var(--ink-2);
  padding: clamp(20px, 3vw, 28px);
  border-bottom: 1px solid var(--line);
}
.about-metric:last-child {
  border-bottom: 0;
}
.about-metric__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(30px, 4.4vw, 44px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}
.about-metric__value em {
  font-style: normal;
  font-size: 0.44em;
  color: var(--cyan);
  margin-left: 4px;
}
.about-metric__label {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 资质 ---------- */
.about-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.about-honor {
  display: grid;
  gap: 10px;
  align-content: start;
  padding: clamp(20px, 3vw, 26px);
  border: 1px solid var(--line);
  background: var(--glass);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  transition: transform 0.25s ease, border-color 0.25s ease;
}
.about-honor__flag {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--orange);
}
.about-honor__title {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
}
.about-honor__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--about-soft);
}

/* ---------- 结尾行动区 ---------- */
.about-cta {
  max-width: var(--about-max);
  margin: 0 auto;
  padding: clamp(20px, 4vw, 40px) var(--about-pad) clamp(56px, 8vw, 96px);
}
.about-cta__box {
  border: 1px solid var(--line-strong);
  padding: clamp(24px, 4vw, 44px);
  display: grid;
  gap: 18px;
  background:
    radial-gradient(circle at 88% 12%, rgba(108, 92, 231, 0.26), transparent 58%),
    radial-gradient(circle at 8% 92%, rgba(34, 230, 211, 0.14), transparent 60%),
    linear-gradient(120deg, rgba(255, 107, 26, 0.1), transparent 55%);
}
.about-cta h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.15;
  letter-spacing: -0.02em;
}
.about-cta__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(245, 239, 225, 0.84);
}
.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .about-scenes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }
  .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 22px 24px;
  }
  .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .about-metric {
    border-bottom: 0;
    border-right: 1px solid var(--line);
  }
  .about-metric:last-child {
    border-right: 0;
  }
  .about-service {
    grid-template-columns: 70px minmax(0, 1fr);
    column-gap: 20px;
  }
}

@media (min-width: 900px) {
  .about-honors {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 1024px) {
  .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 336px;
    align-items: start;
  }
  .about-chapter {
    grid-template-columns: 148px minmax(0, 1fr);
    column-gap: clamp(28px, 5vw, 72px);
  }
  .about-chapter__mark {
    display: block;
    padding-top: 6px;
  }
  .about-chapter__index {
    font-size: clamp(52px, 5vw, 70px);
  }
  .about-chapter__rule {
    width: 48px;
    height: 2px;
    margin-top: 20px;
  }
  .about-figure {
    max-width: 640px;
  }
  .about-figure--tall {
    max-width: 560px;
  }
  .about-honor:hover {
    transform: translateY(-3px);
    border-color: var(--line-strong);
  }
  .about-track__item:hover .about-track__dot {
    background: var(--cyan);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-honor,
  .page-about .about-track__dot {
    transition: none;
  }
  .page-about .about-honor:hover {
    transform: none;
  }
}