.page-about {
  --about-panel: #12224A;
  --about-line: rgba(36, 64, 107, 0.62);
  --about-line-soft: rgba(143, 163, 200, 0.16);
  --about-ink-soft: #C6D2E6;
  --about-brown-soft: #5C4F42;
  --about-paper-line: #E3D9C6;

  position: relative;
  isolation: isolate;
  color: var(--cream);
  background-color: var(--ink);
  background-image:
    linear-gradient(rgba(36, 64, 107, 0.18) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 64, 107, 0.18) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  padding-bottom: clamp(52px, 7vw, 104px);
}

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

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.about-hero {
  position: relative;
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-size: 0.8rem;
  letter-spacing: 0.06em;
}

.page-about .breadcrumb li {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  color: var(--steel);
}

.page-about .breadcrumb a {
  color: var(--cyan-soft);
  text-decoration: none;
}

.page-about .breadcrumb a:hover {
  color: var(--cyan);
}

.about-hero__grid {
  display: grid;
  gap: clamp(30px, 4.5vw, 56px);
  align-items: center;
  padding-block: clamp(30px, 4.4vw, 66px) clamp(34px, 4.6vw, 62px);
}

.about-hero__tag {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin: 0 0 18px;
  padding: 7px 16px 7px 12px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-pill);
  background: rgba(18, 34, 74, 0.6);
  font-size: 0.74rem;
  letter-spacing: 0.18em;
  color: var(--about-ink-soft);
}

.about-hero__tag-dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 208, 0.16);
}

.about-hero__title {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  font-size: clamp(2.5rem, 5.6vw, 4.9rem);
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: #fff;
}

.about-hl {
  position: relative;
  color: var(--cyan);
}

.about-hl::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 0.1em;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--cyan), var(--amber));
  opacity: 0.55;
}

.about-hero__lead {
  max-width: 46ch;
  margin: 0 0 clamp(22px, 3vw, 32px);
  font-size: clamp(1rem, 1.1vw, 1.0625rem);
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.about-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.about-hero__art {
  position: relative;
  padding: clamp(16px, 2.6vw, 28px);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(148deg, rgba(53, 240, 208, 0.13), rgba(255, 154, 46, 0.05) 58%, transparent);
  box-shadow: var(--shadow-card);
}

.about-hero__art::before {
  content: "";
  position: absolute;
  inset: -1px;
  border-radius: inherit;
  background: linear-gradient(140deg, rgba(53, 240, 208, 0.4), transparent 42%, rgba(255, 154, 46, 0.32));
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor;
  mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  mask-composite: exclude;
  padding: 1px;
  pointer-events: none;
}

.about-hero__svg {
  display: block;
  width: 100%;
  height: auto;
}

.about-hero__art-note {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--muted);
}

/* ---------- 主体骨架 ---------- */

.about-body {
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
  padding-top: clamp(10px, 2vw, 22px);
}

.about-toc__label {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.about-toc__list::-webkit-scrollbar {
  display: none;
}

.about-toc__list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 0 16px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-pill);
  background: rgba(18, 34, 74, 0.55);
  font-size: 0.84rem;
  white-space: nowrap;
  text-decoration: none;
  color: var(--about-ink-soft);
  transition: border-color 180ms var(--ease), color 180ms var(--ease);
}

.about-toc__list a:hover,
.about-toc__list a:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
}

.about-toc__idx {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--amber);
}

/* ---------- 分区通用 ---------- */

.about-sec {
  position: relative;
  padding: clamp(26px, 3.6vw, 48px);
  margin-bottom: clamp(20px, 2.8vw, 32px);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  background: rgba(18, 34, 74, 0.62);
  box-shadow: var(--shadow-card);
}

.about-sec:last-child {
  margin-bottom: 0;
}

.about-sec--deep {
  background:
    radial-gradient(120% 100% at 100% 0%, rgba(53, 240, 208, 0.09), transparent 58%),
    rgba(18, 34, 74, 0.7);
}

.about-sec--cream {
  border-color: var(--about-paper-line);
  background: var(--cream);
  color: var(--brown);
}

.about-sec__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 1.6vw, 20px);
  margin-bottom: clamp(16px, 2.2vw, 26px);
}

.about-sec__idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 3vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.about-sec--cream .about-sec__idx {
  color: #C86D12;
}

.about-sec .section-title {
  margin: 0;
  font-size: clamp(1.4rem, 2.4vw, 2.15rem);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: #fff;
}

.about-sec--cream .section-title {
  color: var(--brown);
}

.about-lede {
  max-width: 62ch;
  margin: 0 0 clamp(18px, 2.4vw, 28px);
  font-size: 1rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.about-lede--tight {
  margin-bottom: 16px;
}

.about-sec--cream .about-lede {
  color: var(--about-brown-soft);
}

.about-note {
  margin: clamp(16px, 2.2vw, 24px) 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.about-sec--cream .about-note {
  border-left-color: var(--amber);
  color: var(--about-brown-soft);
}

.page-about .about-note a,
.page-about .about-lede a,
.page-about .about-api a {
  color: var(--cyan);
  text-underline-offset: 3px;
}

.about-sec--cream .about-note a {
  color: #B25E0D;
}

/* ---------- 01 历程 ---------- */

.about-track {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.about-track__node {
  position: relative;
  padding: 20px 20px 22px;
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.6);
}

.about-track__cap {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 12px;
  border-radius: var(--r-pill);
  background: rgba(255, 154, 46, 0.16);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: #9C5A0C;
}

.about-track__dot {
  position: absolute;
  top: 24px;
  right: 20px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(53, 240, 208, 0.18);
}

.about-track__title {
  margin: 0 0 8px;
  font-size: 1.1rem;
  line-height: 1.4;
  color: var(--brown);
}

.about-track__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--about-brown-soft);
}

/* ---------- 02 核验 ---------- */

.about-verify {
  display: grid;
  gap: clamp(22px, 3vw, 38px);
}

.about-sources {
  display: grid;
  gap: 14px;
  margin: 0 0 4px;
  padding: 0;
  list-style: none;
}

.about-sources__item {
  position: relative;
  padding: 16px 18px 16px 44px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: rgba(10, 22, 51, 0.55);
}

.about-sources__dot {
  position: absolute;
  top: 22px;
  left: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.about-sources__dot--a {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(53, 240, 208, 0.16);
}

.about-sources__dot--b {
  background: var(--amber);
  box-shadow: 0 0 0 5px rgba(255, 154, 46, 0.16);
}

.about-sources__dot--c {
  background: var(--grass);
  box-shadow: 0 0 0 5px rgba(47, 125, 99, 0.2);
}

.about-sources__title {
  margin: 0 0 6px;
  font-size: 1rem;
  color: #fff;
}

.about-sources__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

.about-verify__viz {
  margin: 0;
}

.about-verify__viz img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: rgba(10, 22, 51, 0.6);
}

.about-verify__viz figcaption {
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 03 团队 ---------- */

.about-team__banner {
  margin-bottom: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  overflow: hidden;
}

.about-team__banner img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.about-team__bar {
  display: flex;
  gap: 4px;
  height: 62px;
  margin-bottom: 22px;
}

.about-team__seg {
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  padding: 8px 10px;
  border-radius: var(--r-sm);
  font-family: var(--font-mono);
  font-style: normal;
  font-size: 0.95rem;
  color: var(--ink);
}

.about-team__seg i {
  font-style: normal;
}

.about-team__seg--a {
  flex-grow: 24;
  background: linear-gradient(180deg, var(--cyan), #22C6AC);
}

.about-team__seg--b {
  flex-grow: 18;
  background: linear-gradient(180deg, #6FF7E2, #35C9B4);
}

.about-team__seg--c {
  flex-grow: 14;
  background: linear-gradient(180deg, var(--amber), #E07F16);
}

.about-team__seg--d {
  flex-grow: 12;
  background: linear-gradient(180deg, #4C6FA8, var(--steel));
  color: var(--cream);
}

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

.about-roles__card {
  padding: 18px;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: rgba(10, 22, 51, 0.5);
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.about-roles__card:hover {
  border-color: rgba(53, 240, 208, 0.55);
  transform: translateY(-2px);
}

.about-roles__n {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 1.9rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.about-roles__title {
  margin: 0 0 7px;
  font-size: 1rem;
  color: #fff;
}

.about-roles__card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--about-ink-soft);
}

/* ---------- 04 覆盖 ---------- */

.about-matrix {
  display: grid;
  gap: 14px;
  margin: 0 0 clamp(20px, 2.6vw, 30px);
  padding: 0;
  list-style: none;
}

.about-matrix__cell {
  padding: 18px;
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.62);
  transition: border-color 200ms var(--ease), box-shadow 200ms var(--ease);
}

.about-matrix__cell:hover {
  border-color: #C3B49A;
  box-shadow: 0 12px 26px -20px rgba(23, 17, 13, 0.6);
}

.about-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.1rem, 4.4vw, 3.2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: #0F8C78;
}

.about-num__u {
  font-size: 0.42em;
  margin-left: 2px;
}

.about-matrix__label {
  display: block;
  margin: 8px 0 6px;
  font-size: 0.86rem;
  letter-spacing: 0.1em;
  color: #A05E12;
}

.about-matrix__cell p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--about-brown-soft);
}

.about-capacity {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px dashed #C9BAA0;
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.42);
}

.about-capacity__title {
  margin: 0 0 16px;
  font-size: 0.8rem;
  letter-spacing: 0.2em;
  color: #A05E12;
}

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

.about-capacity__row {
  display: grid;
  grid-template-columns: minmax(72px, 96px) 1fr auto;
  align-items: center;
  gap: 12px;
}

.about-capacity__range {
  font-size: 0.84rem;
  color: var(--about-brown-soft);
}

.about-capacity__track {
  display: block;
  height: 10px;
  border-radius: var(--r-pill);
  background: rgba(23, 17, 13, 0.09);
  overflow: hidden;
}

.about-capacity__fill {
  display: block;
  height: 100%;
  border-radius: var(--r-pill);
  background: linear-gradient(90deg, var(--grass), var(--cyan));
}

.about-capacity__row:nth-child(1) .about-capacity__fill { width: 85%; }
.about-capacity__row:nth-child(2) .about-capacity__fill { width: 100%; }
.about-capacity__row:nth-child(3) .about-capacity__fill { width: 62%; }
.about-capacity__row:nth-child(4) .about-capacity__fill { width: 31%; }

.about-capacity__n {
  font-family: var(--font-mono);
  font-size: 0.86rem;
  color: #0F8C78;
}

/* ---------- 05 本地 ---------- */

.about-local {
  display: grid;
  gap: clamp(20px, 2.8vw, 32px);
}

.about-local__text p {
  margin: 0 0 14px;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--about-ink-soft);
}

.about-local__viz {
  margin: 0;
}

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

.about-local__viz figcaption {
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 06 合作 ---------- */

.about-partners {
  display: grid;
  gap: 14px;
  margin-bottom: clamp(20px, 2.6vw, 28px);
}

.about-partners__block {
  padding: 20px;
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-md);
  background: rgba(255, 255, 255, 0.62);
}

.about-partners__n {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: #0F8C78;
}

.page-about .about-partners__block .block-title {
  margin: 0 0 8px;
  font-size: 1rem;
  color: var(--brown);
}

.about-partners__block p {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.75;
  color: var(--about-brown-soft);
}

.about-api {
  padding: clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--about-paper-line);
  border-left: 3px solid var(--grass);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: rgba(47, 125, 99, 0.08);
}

.page-about .about-api .block-title {
  margin: 0 0 10px;
  font-size: 1.05rem;
  color: var(--brown);
}

.about-api p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--about-brown-soft);
}

.page-about .about-api a {
  color: #B25E0D;
}

/* ---------- 07 对接 ---------- */

.about-steps {
  margin-bottom: clamp(22px, 3vw, 32px);
}

.page-about .about-steps .accordion__item {
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: rgba(10, 22, 51, 0.5);
  overflow: hidden;
}

.page-about .about-steps .accordion__item + .accordion__item {
  margin-top: 10px;
}

.page-about .about-steps .accordion__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  min-height: 56px;
  padding: 14px 18px;
  border: 0;
  background: transparent;
  font: inherit;
  font-size: 0.98rem;
  text-align: left;
  color: var(--cream);
  cursor: pointer;
}

.page-about .about-steps .accordion__item[data-open="true"] .accordion__trigger {
  color: var(--cyan);
}

.about-steps__n {
  flex: none;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-steps .accordion__panel {
  display: none;
}

.page-about .about-steps .accordion__item[data-open="true"] .accordion__panel {
  display: block;
}

.page-about .about-steps .accordion__body {
  padding: 0 18px 18px 52px;
}

.page-about .about-steps .accordion__body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--about-ink-soft);
}

.about-contact {
  padding: clamp(20px, 2.8vw, 30px);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  background:
    linear-gradient(140deg, rgba(53, 240, 208, 0.1), transparent 62%),
    rgba(10, 22, 51, 0.6);
}

.about-contact__item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 10px;
}

.about-contact__k {
  min-width: 72px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.about-contact__v {
  font-family: var(--font-mono);
  font-size: clamp(0.95rem, 1.6vw, 1.15rem);
  letter-spacing: 0.01em;
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
}

.about-contact__note {
  margin: 14px 0 20px;
  font-size: 0.86rem;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */

@media (min-width: 620px) {
  .about-track,
  .about-roles,
  .about-matrix,
  .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .about-track {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .about-track__node::after {
    content: "";
    position: absolute;
    top: 30px;
    right: -18px;
    width: 18px;
    height: 1px;
    background: linear-gradient(90deg, var(--amber), transparent);
  }

  .about-track__node:last-child::after {
    display: none;
  }

  .about-verify {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
  }

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

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

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

  .about-local {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    align-items: center;
  }

  .about-contact__item {
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }
}

@media (min-width: 1024px) {
  .about-body {
    grid-template-columns: minmax(0, 1fr) 258px;
    align-items: start;
  }

  .about-toc {
    order: 2;
    position: sticky;
    top: 96px;
    padding: 18px 16px;
    border: 1px solid var(--about-line);
    border-radius: var(--r-md);
    background: rgba(18, 34, 74, 0.55);
  }

  .about-main {
    order: 1;
    min-width: 0;
  }

  .about-toc__list {
    flex-direction: column;
    overflow: visible;
  }

  .about-toc__list a {
    width: 100%;
    padding: 0 14px;
    border-color: transparent;
    background: transparent;
    border-radius: var(--r-sm);
  }

  .about-toc__list a:hover,
  .about-toc__list a:focus-visible {
    border-color: var(--about-line);
    background: rgba(53, 240, 208, 0.07);
  }
}

@media (min-width: 1280px) {
  .about-verify {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .about-roles__card,
  .about-matrix__cell,
  .about-toc__list a {
    transition: none;
  }

  .about-roles__card:hover {
    transform: none;
  }
}