.page-about {
  --about-orange: #FF5A1F;
  --about-blue: #00B4FF;
  --about-green: #8A9A5B;
  --about-surface: #1A1D24;
  --about-surface-2: #20242E;
  --about-stroke: #2A2E38;
  --about-text: #F2F0E9;
  --about-muted: #C0BCB4;
  --about-base: #0B0D12;
  --about-gutter: clamp(1rem, 3vw, 2.5rem);
  background: var(--about-base);
  color: var(--about-text);
  overflow-x: hidden;
}

.page-about a {
  color: var(--about-blue);
  text-decoration: none;
  transition: color var(--duration) var(--ease);
}

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

.page-about .container {
  max-width: 1440px;
  margin-inline: auto;
  padding-inline: var(--about-gutter);
}

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  padding: 0;
  margin: 0;
  font-size: 13px;
  color: var(--about-muted);
}

.page-about .breadcrumb li + li::before {
  content: "·";
  margin-right: 8px;
  color: var(--about-stroke);
}

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

.page-about .eyebrow {
  margin: 0 0 0.75rem;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-orange);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.04em;
}

.page-about h1 {
  font-size: clamp(2rem, 5vw, 3.6rem);
  line-height: 1.04;
  margin-bottom: 1.25rem;
}

.page-about h2 {
  font-size: clamp(1.6rem, 3.4vw, 2.6rem);
  line-height: 1.1;
}

.page-about h3 {
  font-size: 1.15rem;
  line-height: 1.3;
}

.page-about p {
  margin: 0 0 1rem;
  line-height: 1.7;
  font-size: 16px;
  color: var(--about-muted);
}

.page-about .lead {
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  color: var(--about-text);
  line-height: 1.75;
  max-width: 52rem;
}

.about-hero {
  padding: clamp(2.5rem, 6vw, 5rem) 0 clamp(2rem, 5vw, 4rem);
  border-bottom: 1px solid var(--about-stroke);
  background:
    linear-gradient(115deg, rgba(255, 90, 31, 0.08) 0%, transparent 38%),
    linear-gradient(255deg, rgba(0, 180, 255, 0.05) 0%, transparent 46%),
    var(--about-base);
}

.about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}

@media (min-width: 900px) {
  .about-hero__grid {
    grid-template-columns: minmax(160px, 220px) 1fr;
    gap: clamp(2rem, 5vw, 4rem);
  }
}

.about-hero__aside {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  padding-top: 0.5rem;
}

.about-hero__code {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--about-stroke);
  border-left: 2px solid var(--about-orange);
  padding-left: 0.75rem;
}

.about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 1.5rem;
}

.about-hero .tag {
  display: inline-block;
  padding: 0.3rem 0.75rem;
  font-size: 12px;
  font-family: var(--font-display);
  letter-spacing: 0.06em;
  border: 1px solid var(--about-stroke);
  color: var(--about-muted);
  background: transparent;
}

.about-hero .tag-orange {
  border-color: var(--about-orange);
  color: var(--about-orange);
}

.about-hero .tag-blue {
  border-color: var(--about-blue);
  color: var(--about-blue);
}

.about-hero .tag-green {
  border-color: var(--about-green);
  color: var(--about-green);
}

/* 时间轴 */
.about-timeline {
  padding: clamp(3rem, 7vw, 6rem) 0;
  border-bottom: 1px solid var(--about-stroke);
}

.about-timeline .section-head,
.about-data .section-head,
.about-team .section-head {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1rem 1.25rem;
  margin-bottom: 3rem;
}

.about-timeline .index,
.about-data .index,
.about-team .index {
  font-family: var(--font-display);
  font-size: 3rem;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px var(--about-orange);
}

.about-timeline .section-head p,
.about-data .section-head p,
.about-team .section-head p {
  font-size: 14px;
  color: var(--about-muted);
  margin: 0.35rem 0 0;
}

.about-timeline__list {
  display: flex;
  flex-direction: column;
  gap: 0;
  position: relative;
  max-width: 900px;
}

.about-timeline__row {
  display: grid;
  grid-template-columns: 72px 32px 1fr;
  gap: 1rem;
  padding-bottom: 2.25rem;
}

@media (min-width: 640px) {
  .about-timeline__row {
    grid-template-columns: 108px 48px 1fr;
    gap: 1.5rem;
  }
}

.about-timeline__year {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  text-align: right;
  gap: 0.25rem;
  padding-top: 0.2rem;
}

.about-timeline__yearnum {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--about-orange);
  letter-spacing: -0.02em;
}

.about-timeline__caption {
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--about-muted);
  border-top: 1px solid var(--about-stroke);
  padding-top: 0.25rem;
  min-width: 48px;
}

.about-timeline__rail {
  position: relative;
  display: flex;
  justify-content: center;
}

.about-timeline__rail::before {
  content: "";
  width: 1px;
  background: var(--about-stroke);
  position: absolute;
  top: 0;
  bottom: 0;
}

.about-timeline__dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--about-surface);
  border: 2px solid var(--about-stroke);
  position: relative;
  z-index: 1;
  margin-top: 0.35rem;
}

.about-timeline__dot.is-active {
  background: var(--about-orange);
  border-color: var(--about-orange);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.15);
}

.about-timeline__row:hover .about-timeline__dot {
  background: var(--about-blue);
  border-color: var(--about-blue);
  box-shadow: 0 0 0 4px rgba(0, 180, 255, 0.12);
}

.about-timeline__content {
  background: var(--about-surface);
  border: 1px solid var(--about-stroke);
  border-left: 2px solid var(--about-orange);
  padding: 1rem 1.25rem 1.1rem;
  margin-bottom: 0.5rem;
  transition: transform 0.18s var(--ease), background 0.18s var(--ease);
}

.about-timeline__row:hover .about-timeline__content {
  background: var(--about-surface-2);
  transform: translateX(4px);
}

.about-timeline__content h3 {
  color: var(--about-text);
  font-size: clamp(1.1rem, 2.2vw, 1.4rem);
  margin-bottom: 0.5rem;
}

.about-timeline__content p {
  margin-bottom: 0.65rem;
  font-size: 14px;
}

.about-timeline__content .tag {
  display: inline-block;
  font-size: 12px;
  padding: 0.2rem 0.55rem;
  border: 1px solid var(--about-stroke);
  font-family: var(--font-display);
  letter-spacing: 0.05em;
}

.about-timeline__figure {
  margin: 1.5rem 0 0 0;
  padding-left: 0;
}

@media (min-width: 640px) {
  .about-timeline__figure {
    padding-left: 188px;
  }
}

.about-timeline__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-stroke);
}

.about-timeline__figure figcaption {
  font-family: var(--font-display);
  font-size: 12px;
  color: var(--about-muted);
  padding: 0.5rem 0.25rem;
  letter-spacing: 0.06em;
  border-bottom: 1px solid var(--about-stroke);
}

/* 数据覆盖 */
.about-data {
  padding: clamp(3rem, 7vw, 6rem) 0;
  border-bottom: 1px solid var(--about-stroke);
  background:
    linear-gradient(90deg, rgba(0, 180, 255, 0.03) 0%, transparent 70%);
}

.about-data__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1px;
  background: var(--about-stroke);
  border: 1px solid var(--about-stroke);
}

@media (min-width: 720px) {
  .about-data__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.about-data__stat {
  background: var(--about-surface);
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  min-height: 160px;
  transition: background 0.18s var(--ease);
}

.about-data__stat:hover {
  background: var(--about-surface-2);
}

.about-data__stat--large {
  grid-column: 1 / -1;
  background:
    linear-gradient(135deg, rgba(255, 90, 31, 0.12) 0%, transparent 45%),
    var(--about-surface);
}

@media (min-width: 720px) {
  .about-data__stat--large {
    grid-column: span 1;
    grid-row: span 2;
  }
}

.about-data__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  line-height: 0.95;
  color: var(--about-text);
  letter-spacing: -0.02em;
}

.about-data__stat--large .about-data__num {
  color: var(--about-orange);
}

.about-data__unit {
  font-family: var(--font-display);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--about-blue);
}

.about-data__stat p {
  font-size: 13px;
  margin: 0;
  color: var(--about-muted);
}

.about-data__note {
  grid-column: 1 / -1;
  background: var(--about-surface);
  border-left: 3px solid var(--about-cyan, #4DD0E1);
  padding: 1.5rem 1.25rem;
}

@media (min-width: 720px) {
  .about-data__note {
    grid-column: span 3;
  }
}

.about-data__note h3 {
  color: var(--about-text);
  margin-bottom: 0.5rem;
}

.about-data__note p {
  font-size: 14px;
}

.about-data__note .btn {
  margin-top: 0.5rem;
}

.about-data__map {
  margin-top: 2rem;
  display: flex;
  align-items: center;
  gap: 1rem;
  background: linear-gradient(90deg, rgba(0, 180, 255, 0.09) 0%, transparent 100%);
  border: 1px solid var(--about-stroke);
  border-radius: 0;
  padding: 1rem 1.25rem;
}

.about-data__map-line {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.about-data__map-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--about-cyan, #4DD0E1);
  flex-shrink: 0;
  box-shadow: 0 0 10px rgba(77, 208, 225, 0.6);
}

.about-data__map-text {
  font-size: 13px;
  color: var(--about-muted);
}

/* 使命 */
.about-mission {
  padding: clamp(3rem, 7vw, 6rem) 0;
  border-bottom: 1px solid var(--about-stroke);
  background: var(--about-surface);
}

.about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 900px) {
  .about-mission__grid {
    grid-template-columns: 2fr 3fr;
    gap: clamp(2rem, 5vw, 4rem);
  }
}

.about-mission__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-stroke);
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.about-mission__body h2 {
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  color: var(--about-text);
  margin-bottom: 1rem;
}

.about-mission__lead {
  font-size: 1.1rem;
  color: var(--about-text);
  margin-bottom: 1.25rem;
}

.about-mission__list {
  list-style: none;
  padding: 0;
  margin: 0 0 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.about-mission__list li {
  padding-left: 1.25rem;
  position: relative;
  font-size: 15px;
  line-height: 1.6;
  color: var(--about-muted);
}

.about-mission__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6rem;
  width: 6px;
  height: 6px;
  background: var(--about-orange);
}

/* 团队 */
.about-team {
  padding: clamp(3rem, 7vw, 6rem) 0;
  border-bottom: 1px solid var(--about-stroke);
}

.about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-stroke);
  border: 1px solid var(--about-stroke);
  margin-bottom: 2rem;
}

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

.about-team__card {
  background: var(--about-surface);
  padding: 1.5rem 1.5rem 1.75rem;
  display: flex;
  flex-direction: column;
  gap: 0.65rem;
}

.about-team__card:hover {
  background: var(--about-surface-2);
}

.about-team__icon {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2.4rem;
  line-height: 0.9;
  color: var(--about-orange);
}

.about-team__card--blue .about-team__icon {
  color: var(--about-blue);
}

.about-team__card h3 {
  color: var(--about-text);
  font-size: 1.05rem;
}

.about-team__card p {
  font-size: 14px;
  margin: 0;
}

.about-team__figure {
  margin: 0;
  position: relative;
}

.about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-stroke);
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.about-team__figure figcaption {
  font-family: var(--font-display);
  font-size: 12px;
  color: var(--about-muted);
  padding: 0.5rem 0.25rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--about-stroke);
}

/* 2025 变更说明 */
.about-change {
  padding: clamp(3rem, 7vw, 5.5rem) 0;
  background:
    linear-gradient(100deg, rgba(179, 92, 68, 0.1) 0%, transparent 40%),
    linear-gradient(280deg, rgba(0, 180, 255, 0.05) 0%, transparent 35%),
    var(--about-base);
}

.about-change__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  background: var(--about-surface);
  border: 1px solid var(--about-stroke);
  border-left: 4px solid var(--about-terracotta, #B35C44);
  padding: clamp(1.5rem, 4vw, 3rem);
}

@media (min-width: 760px) {
  .about-change__inner {
    grid-template-columns: auto 1fr;
    gap: 2rem;
  }
}

.about-change__tag {
  display: flex;
  justify-content: flex-start;
}

.about-change__tag .tag {
  display: inline-block;
  background: var(--about-orange);
  color: var(--about-base);
  font-family: var(--font-display);
  font-size: 12px;
  letter-spacing: 0.08em;
  padding: 0.35rem 0.8rem;
  border: 0;
}

.about-change__body h2 {
  font-size: clamp(1.4rem, 3vw, 2.4rem);
  color: var(--about-text);
  margin-bottom: 0.75rem;
}

.about-change__list {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.about-change__list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 15px;
  color: var(--about-muted);
}

.about-change__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55rem;
  width: 5px;
  height: 5px;
  background: var(--about-blue);
  transform: rotate(45deg);
}

.about-change__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* 相关链接 */
.about-links {
  padding: 0 0 clamp(3rem, 6vw, 5rem);
}

.about-links__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-stroke);
  border: 1px solid var(--about-stroke);
  border-top: 0;
}

@media (min-width: 640px) {
  .about-links__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

.about-links__item {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  background: var(--about-base);
  padding: 1.5rem;
  transition: background 0.18s var(--ease), box-shadow 0.18s var(--ease);
}

.about-links__item:hover {
  background: var(--about-surface);
  box-shadow: inset 0 -2px 0 var(--about-orange);
}

.about-links__index {
  font-family: var(--font-display);
  font-size: 13px;
  color: var(--about-blue);
  letter-spacing: 0.1em;
}

.about-links__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.2rem;
  color: var(--about-text);
  letter-spacing: -0.02em;
}

.about-links__desc {
  font-size: 13px;
  color: var(--about-muted);
  line-height: 1.5;
}

/* 通用按钮 */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.7rem 1.4rem;
  border: 1px solid var(--about-stroke);
  color: var(--about-text);
  cursor: pointer;
  white-space: nowrap;
  transition: background 0.18s var(--ease), color 0.18s var(--ease), transform 0.18s var(--ease);
}

.page-about .btn-primary {
  background: var(--about-orange);
  color: var(--about-base);
  border-color: var(--about-orange);
}

.page-about .btn-primary:hover {
  background: #ff7a45;
  border-color: #ff7a45;
  color: var(--about-base);
}

.page-about .btn-line:hover {
  border-color: var(--about-blue);
  color: var(--about-blue);
}

/* 焦点可访问性 */
.page-about a:focus-visible,
.page-about .btn:focus-visible {
  outline: 2px solid var(--about-blue);
  outline-offset: 3px;
}

/* 移动端微调 */
@media (max-width: 520px) {
  .about-timeline__row {
    grid-template-columns: 60px 24px 1fr;
    gap: 0.65rem;
  }

  .about-timeline__yearnum {
    font-size: 1.25rem;
  }

  .about-timeline__caption {
    font-size: 10px;
    letter-spacing: 0.08em;
  }

  .about-data__stat {
    min-height: 140px;
    padding: 1rem;
  }

  .about-data__num {
    font-size: 2rem;
  }

  .about-change__inner {
    padding: 1.25rem;
  }
}

.page-about {
  --about-cyan: transparent;
  --about-terracotta: currentColor;
}