.page-about {
  --about-pad: clamp(20px, 4vw, 56px);
  --about-max: 1280px;
  --about-sand: #e9e3d7;
  background: var(--c-cream);
  color: var(--c-ink);
}

.page-about__wrap {
  max-width: var(--about-max);
  margin-inline: auto;
  padding-inline: var(--about-pad);
}

/* ===== 首屏：品牌宣言 + 抽象视觉 ===== */
.about-hero {
  position: relative;
  overflow: hidden;
  padding: 48px 0 72px;
  background:
    radial-gradient(circle at 84% 16%, rgba(255, 107, 53, 0.24), transparent 44%),
    linear-gradient(135deg, var(--c-blue-deep) 0%, var(--c-blue) 66%, var(--c-blue-2) 100%);
  color: var(--c-white);
}

.about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 44px 44px;
  -webkit-mask-image: linear-gradient(100deg, black, transparent 74%);
  mask-image: linear-gradient(100deg, black, transparent 74%);
  pointer-events: none;
}

.about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
  align-items: center;
}

.about-hero .breadcrumb {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-silver);
}

.about-hero .breadcrumb a {
  color: var(--c-ember-2);
  text-decoration: none;
}

.about-hero__kicker,
.about-cta__kicker {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--c-ember);
  margin: 0 0 12px;
}

.about-hero h1 {
  margin: 16px 0 20px;
  font-family: var(--font-sans);
  font-size: clamp(28px, 5.2vw, 54px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  transform: skew(-5deg);
  max-width: 12em;
}

.about-hero__lead {
  margin: 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.8);
}

.about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 26px;
  margin-top: 34px;
}

.about-hero__meta .data-line__value {
  font-size: clamp(24px, 3vw, 32px);
}

.about-hero__visual {
  position: relative;
  min-width: 0;
}

.about-hero__frame {
  border: 2px solid rgba(255, 255, 255, 0.26);
  box-shadow: var(--shadow-2);
  transform: rotate(1.6deg);
  background: var(--c-blue-2);
}

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

/* ===== 章节交替布局：左侧索引 + 右侧正文 ===== */
.about-layout {
  display: grid;
  gap: 28px;
  padding-top: 48px;
  padding-bottom: 72px;
}

.about-toc {
  position: relative;
  align-self: start;
  border-left: 2px solid var(--c-blue);
  padding-left: 18px;
  margin-top: 8px;
}

.about-toc__label {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--c-stone);
  text-transform: uppercase;
  margin: 0 0 14px;
}

.about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  font-weight: 700;
  color: var(--c-blue);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: border-color var(--ease), color var(--ease);
}

.about-toc__link span {
  font-family: var(--font-num);
  font-size: 12px;
  color: var(--c-clay);
}

.about-toc__note {
  margin: 18px 0 0;
  font-size: 12px;
  line-height: 1.6;
  color: var(--c-stone);
}

.about-content {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 48px;
}

/* ===== 章节通用样式 ===== */
.about-section {
  padding: clamp(26px, 4vw, 44px);
  background: var(--c-white);
  border: 2px solid var(--c-blue);
  box-shadow: var(--shadow-1);
  scroll-margin-top: 24px;
}

.about-section--alt {
  background:
    linear-gradient(160deg, rgba(192, 197, 201, 0.14), transparent 62%),
    var(--about-sand);
  border-color: var(--c-stone);
}

.about-section--dark {
  background:
    radial-gradient(circle at 12% 8%, rgba(255, 107, 53, 0.18), transparent 40%),
    var(--c-blue);
  border-color: var(--c-blue-deep);
  color: var(--c-white);
  box-shadow: var(--shadow-2);
}

.about-section__header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 28px;
}

.about-section__num {
  display: inline-grid;
  place-items: center;
  width: 44px;
  height: 44px;
  flex: none;
  font-family: var(--font-num);
  font-size: 18px;
  font-weight: 700;
  color: var(--c-white);
  background: var(--c-clay);
  border: 2px solid var(--c-blue);
  box-shadow: 3px 3px 0 var(--c-blue);
}

.about-section--alt .about-section__num {
  background: var(--c-blue);
  border-color: var(--c-blue);
}

.about-section--dark .about-section__num {
  background: var(--c-ember);
  border-color: var(--c-white);
  box-shadow: 3px 3px 0 rgba(255, 255, 255, 0.6);
}

.about-section .sec-title {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 900;
  transform: skew(-5deg);
}

.about-section .sec-title__index {
  font-family: var(--font-num);
  font-size: 14px;
  color: var(--c-clay);
  margin-right: 8px;
}

.about-section--dark .sec-title,
.about-section--dark .sec-title__index {
  color: var(--c-white);
}

.about-section__lead {
  margin: 0 0 26px;
  font-size: 15px;
  line-height: 1.78;
  max-width: 44em;
}

.about-section__body > p:not(.about-section__lead) {
  font-size: 14px;
  line-height: 1.75;
}

/* ===== 01 我们是谁：模块卡片 ===== */
.page-about__modules {
  display: grid;
  gap: 20px;
  margin-top: 8px;
}

.page-about__module {
  position: relative;
  background: var(--c-cream);
  border: 2px solid var(--c-blue);
  box-shadow: var(--shadow-1);
  padding: 24px 22px 22px;
  transition: box-shadow var(--ease), transform var(--ease);
}

.page-about__module:hover {
  box-shadow: var(--shadow-2);
  transform: translate(-2px, -2px);
}

.page-about__module:nth-child(2n) {
  transform: translateY(10px) rotate(0.6deg);
}

.page-about__module:nth-child(2n):hover {
  transform: translateY(8px) rotate(0deg);
}

.page-about__module-num {
  display: block;
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  color: var(--c-ember);
  letter-spacing: 0.08em;
  margin-bottom: 10px;
}

.page-about__module h3 {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 900;
  color: var(--c-blue);
  letter-spacing: -0.01em;
}

.page-about__module p {
  margin: 0 0 16px;
  font-size: 13px;
  line-height: 1.72;
  color: var(--c-ink);
}

.page-about__module .tag {
  display: inline-block;
}

/* ===== 02 发展里程碑：垂直时间线 ===== */
.about-milestones {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.about-milestones li {
  position: relative;
  padding: 0 0 30px 38px;
}

.about-milestones li::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-clay);
  border: 3px solid var(--c-white);
  box-shadow: 0 0 0 2px var(--c-clay);
}

.about-milestones li::after {
  content: "";
  position: absolute;
  left: 12px;
  top: 26px;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--c-clay), var(--c-silver));
}

.about-milestones li:last-child {
  padding-bottom: 0;
}

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

.about-milestones__num {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  color: var(--c-clay);
  letter-spacing: 0.1em;
}

.about-milestones__title {
  display: inline-block;
  margin: 4px 0 6px;
  font-size: 18px;
  font-weight: 900;
  color: var(--c-blue);
  transform: skew(-3deg);
}

.about-milestones p {
  margin: 0;
  max-width: 34em;
  font-size: 13px;
  line-height: 1.72;
  color: var(--c-ink);
}

/* ===== 03 数据与团队：深色板块 ===== */
.about-data {
  display: grid;
  gap: 34px;
  margin-bottom: 48px;
}

.about-data__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.about-data__stats .data-line {
  padding: 10px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.22);
}

.about-data__stats .data-line__value {
  display: block;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1;
  margin-bottom: 8px;
}

.about-data__fig {
  margin: 0;
}

.about-data__frame,
.about-team__frame {
  border: 2px solid var(--c-silver);
  box-shadow: var(--shadow-1);
  background: var(--c-blue-2);
}

.about-data__frame img,
.about-team__frame img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.about-data__fig figcaption,
.about-team__fig figcaption {
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.62);
}

.about-team {
  border-top: 1px solid rgba(255, 255, 255, 0.24);
  padding-top: 40px;
}

.about-team__title {
  margin: 0 0 22px;
  font-size: 20px;
  font-weight: 900;
  color: var(--c-white);
  transform: skew(-4deg);
}

.about-team__bubbles {
  display: grid;
  gap: 16px;
}

.about-team__core,
.about-team__bubble {
  position: relative;
  border: 2px solid var(--c-white);
  background: rgba(255, 255, 255, 0.06);
  padding: 20px;
  text-align: center;
  transition: background var(--ease), transform var(--ease);
}

.about-team__core {
  background: var(--c-ember);
  border-color: var(--c-ember-2);
  box-shadow: 4px 4px 0 var(--c-white);
}

.about-team__bubble:hover,
.about-team__bubble:focus-visible {
  background: rgba(255, 107, 53, 0.18);
  transform: translateY(-4px);
}

.about-team__core-name {
  display: block;
  font-size: 18px;
  font-weight: 900;
  color: var(--c-white);
}

.about-team__core-total {
  display: block;
  margin-top: 6px;
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 700;
  color: var(--c-white);
}

.about-team__role {
  display: block;
  font-size: 16px;
  font-weight: 800;
  color: var(--c-white);
}

.about-team__count {
  display: block;
  margin-top: 4px;
  font-family: var(--font-num);
  font-size: 24px;
  font-weight: 700;
  color: var(--c-ember);
}

.about-team__hint {
  display: block;
  margin-top: 8px;
  max-width: 18em;
  margin-inline: auto;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.68);
}

.about-team__fig {
  margin: 30px 0 0;
}

/* ===== 04 合作与荣誉 ===== */
.about-honors {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.about-honors li {
  position: relative;
  padding: 22px 22px 22px 60px;
  border: 2px solid var(--c-blue);
  background: var(--c-cream);
  box-shadow: 4px 4px 0 var(--c-blue);
}

.about-honors li::before {
  content: "★";
  position: absolute;
  left: 18px;
  top: 20px;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  font-size: 14px;
  color: var(--c-ember);
  background: var(--c-white);
  border: 2px solid var(--c-blue);
}

.about-honors strong {
  display: block;
  margin-bottom: 6px;
  font-size: 16px;
  font-weight: 900;
  color: var(--c-blue);
  transform: skew(-4deg);
}

.about-honors p {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
}

/* ===== CTA 区块 ===== */
.about-cta {
  scroll-margin-top: 24px;
}

.about-cta__card {
  background:
    radial-gradient(circle at 88% 24%, rgba(255, 107, 53, 0.26), transparent 42%),
    linear-gradient(135deg, var(--c-blue-deep), var(--c-blue-3));
  border: 2px solid var(--c-blue-deep);
  box-shadow: var(--shadow-2);
  padding: clamp(26px, 5vw, 50px);
  color: var(--c-white);
}

.about-cta__title {
  margin: 0 0 12px;
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 900;
  transform: skew(-4deg);
}

.about-cta__text {
  max-width: 34em;
  margin: 0 0 26px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.8);
}

.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.about-cta__actions .btn {
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
}

.about-cta__actions .btn--ci {
  background: var(--c-ember);
  border-color: var(--c-ember-2);
  color: var(--c-white);
}

.about-cta__actions .btn--outline {
  color: var(--c-white);
  border-color: var(--c-white);
}

.about-cta__actions .btn--ghost {
  color: var(--c-silver);
}

/* ===== 响应式：桌面端 ===== */
@media (min-width: 640px) {
  .page-about__modules {
    grid-template-columns: repeat(2, 1fr);
    gap: 26px;
  }

  .about-data {
    grid-template-columns: 1fr 1.05fr;
    gap: 40px;
    align-items: center;
  }

  .about-team__bubbles {
    grid-template-columns: repeat(4, 1fr);
    align-items: stretch;
  }

  .about-team__core {
    grid-row: span 2;
  }

  .about-team__bubble {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .about-honors {
    grid-template-columns: repeat(2, 1fr);
    gap: 22px;
  }

  .about-hero {
    padding: 72px 0 96px;
  }
}

@media (min-width: 1024px) {
  .about-hero__inner {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 64px;
  }

  .about-hero__visual {
    justify-self: end;
    max-width: 400px;
  }

  .about-layout {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 64px;
    padding-top: 72px;
    padding-bottom: 96px;
  }

  .about-toc {
    position: sticky;
    top: 96px;
    margin-top: 0;
  }

  .about-content {
    gap: 56px;
  }

  .page-about__module:nth-child(2n) {
    transform: translateY(16px) rotate(0.6deg);
  }

  .page-about__module:nth-child(2n):hover {
    transform: translateY(14px) rotate(0deg);
  }
}