.page-about {
  --about-accent-soft: rgba(255, 77, 46, 0.18);
  --about-accent-line: rgba(255, 77, 46, 0.36);
  --about-panel-deep: #0d1a2c;
  background: var(--bg-deep);
  color: var(--text-light);
  overflow-x: hidden;
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  padding: 48px 0 40px;
  background:
    linear-gradient(120deg, rgba(255, 77, 46, 0.14) 0%, transparent 42%),
    radial-gradient(ellipse at 82% 20%, rgba(255, 77, 46, 0.08) 0%, transparent 55%),
    var(--bg-darker);
  border-bottom: 1px solid var(--about-accent-line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 42%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent) 0%, rgba(255, 77, 46, 0) 100%);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0 0 36px;
  padding: 0;
  list-style: none;
  font-size: 14px;
  color: var(--text-dim);
}

.page-about .breadcrumb__link {
  color: var(--silver);
  text-decoration: none;
  transition: color var(--dur) var(--ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--accent);
}

.page-about .breadcrumb__sep {
  color: var(--text-dim);
}

.page-about .breadcrumb__text {
  color: var(--text-light);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about .about-hero__kicker,
.page-about .about-next__kicker {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--accent);
  margin: 0 0 12px;
  text-transform: uppercase;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-size: clamp(42px, 7vw, 68px);
  font-weight: 900;
  line-height: 1.04;
  letter-spacing: 0.01em;
  margin: 0 0 20px;
  color: var(--text-light);
}

.page-about .about-hero__lead {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-light);
  margin: 0 0 16px;
  max-width: 62ch;
}

.page-about .about-hero__note {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-dim);
  max-width: 58ch;
  margin: 0;
}

.page-about .about-hero__panel {
  background: var(--bg-card);
  border-left: 3px solid var(--accent);
  padding: 24px 22px;
  align-self: start;
  position: relative;
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  right: -6px;
  top: -6px;
  width: 22px;
  height: 22px;
  background: repeating-linear-gradient(135deg, var(--accent) 0 4px, transparent 4px 8px);
  opacity: 0.55;
}

.page-about .about-hero__panel-title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--silver);
  margin: 0 0 16px;
  text-transform: uppercase;
}

.page-about .about-hero__toc {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  color: var(--text-light);
  text-decoration: none;
  font-size: 15px;
  padding: 4px 0;
  border-bottom: 1px solid rgba(192, 192, 192, 0.12);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-hero__toc a:hover {
  color: var(--accent);
  border-color: var(--accent);
}

.page-about .about-hero__toc span {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--accent);
  min-width: 24px;
}

/* ---------- 通用章节结构 ---------- */
.page-about .about-section {
  padding: 72px 0;
}

.page-about .about-section__head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 26px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--about-accent-line);
}

.page-about .about-section__head .section-index {
  font-family: var(--font-display);
  font-size: 44px;
  font-weight: 900;
  line-height: 1;
  color: var(--accent);
  letter-spacing: 0.02em;
}

.page-about .about-section__head h2 {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: 0.02em;
  white-space: nowrap;
  margin: 0;
  color: var(--text-light);
}

.page-about .about-section__rule {
  flex: 1;
  min-width: 40px;
  height: 2px;
  background: linear-gradient(90deg, var(--accent) 0%, transparent 100%);
  opacity: 0.55;
}

.page-about .about-section__intro {
  font-size: 16px;
  line-height: 1.75;
  color: var(--silver);
  max-width: 68ch;
  margin: 0 0 32px;
}

/* 深色背景节奏 */
.page-about .about-scale,
.page-about .about-team,
.page-about .about-credentials {
  background: var(--bg-darker);
}

/* ---------- 01 品牌缘起 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-origin__text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-light);
  margin: 0 0 18px;
}

.page-about .about-origin__text strong {
  color: var(--accent);
  font-weight: 600;
}

.page-about .about-origin__flow {
  margin: 24px 0 0;
  padding: 16px 18px;
  background: var(--about-accent-soft);
  border-left: 4px solid var(--accent);
}

.page-about .about-origin__flow p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-origin__media {
  position: relative;
  padding: 6px 0 6px 6px;
}

.page-about .about-origin__media::before {
  content: "";
  position: absolute;
  inset: 0;
  transform: translate(10px, 10px);
  background: linear-gradient(135deg, var(--accent) 0%, transparent 60%);
  opacity: 0.22;
  z-index: 0;
}

.page-about .about-origin__img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  clip-path: polygon(2% 0, 100% 0, 98% 100%, 0 100%);
}

.page-about .about-origin__caption {
  display: block;
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
  letter-spacing: 0.02em;
  padding-left: 8px;
  border-left: 2px solid var(--accent);
}

/* ---------- 02 数据规模 ---------- */
.page-about .about-scale__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-scale__item {
  background: linear-gradient(150deg, var(--bg-card) 0%, rgba(16, 35, 58, 0.72) 100%);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 22px 16px;
  min-height: 132px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-scale__item:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.28);
}

.page-about .about-scale__num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 52px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--accent);
  display: block;
  margin-bottom: 12px;
}

.page-about .about-scale__label {
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--text-dim);
}

/* ---------- 03 发展历程 ---------- */
.page-about .about-timeline__list {
  position: relative;
  margin: 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent) 0%, rgba(255, 77, 46, 0.04) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  margin-bottom: 28px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 22px;
  width: 10px;
  height: 10px;
  background: var(--bg-deep);
  border: 2px solid var(--accent);
  transform: rotate(45deg);
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  background: var(--bg-darker);
  border: 1px solid var(--about-accent-line);
  padding: 5px 14px 5px 12px;
  margin-bottom: 10px;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about .about-timeline__card {
  background: var(--bg-card);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 20px 22px;
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-timeline__card:hover {
  transform: translateX(6px);
  background: rgba(255, 77, 46, 0.07);
}

.page-about .about-timeline__card h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--text-light);
  letter-spacing: 0.01em;
}

.page-about .about-timeline__card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--silver);
  margin: 0;
}

/* ---------- 04 团队与理念 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}

.page-about .about-team__media {
  position: relative;
  margin-bottom: 8px;
}

.page-about .about-team__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 2%, 98% 100%, 2% 100%);
}

.page-about .about-team__text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-light);
  margin: 0 0 18px;
}

.page-about .about-team__motto {
  margin: 0 0 18px;
  padding: 18px 20px;
  background: var(--about-accent-soft);
  border-left: 4px solid var(--accent);
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 700;
  color: var(--accent-light);
  letter-spacing: 0.03em;
}

.page-about .about-team__motto cite {
  display: block;
  font-size: 12px;
  font-family: var(--font-body);
  font-style: normal;
  color: var(--text-dim);
  margin-top: 6px;
}

.page-about .about-team__principles {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-team__principles li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--silver);
}

.page-about .about-team__principles li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 9px;
  height: 3px;
  background: var(--accent);
  transform: skewX(-20deg);
}

/* ---------- 05 合作生态 ---------- */
.page-about .about-ecosystem__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}

.page-about .about-ecosystem__media {
  position: relative;
}

.page-about .about-ecosystem__img {
  width: 100%;
  height: auto;
  display: block;
  object-fit: cover;
  border-radius: var(--radius);
}

.page-about .about-ecosystem__text p {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-light);
  margin: 0 0 18px;
}

.page-about .about-ecosystem__steps {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-ecosystem__steps li {
  display: flex;
  align-items: center;
  gap: 12px;
  background: var(--bg-card);
  border-left: 3px solid var(--accent);
  padding: 12px 14px;
  font-size: 14px;
  color: var(--silver);
}

.page-about .about-ecosystem__steps span {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent-light);
  letter-spacing: 0.04em;
  min-width: 64px;
}

/* ---------- 06 资质认证 ---------- */
.page-about .about-credentials__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .about-credentials__item {
  background: linear-gradient(145deg, var(--bg-card) 0%, rgba(16, 35, 58, 0.8) 100%);
  border-top: 3px solid var(--accent);
  border-radius: var(--radius);
  padding: 24px 20px;
  position: relative;
}

.page-about .about-credentials__badge {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 4px 8px;
  margin-bottom: 14px;
  text-transform: uppercase;
}

.page-about .about-credentials__item h3 {
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--text-light);
}

.page-about .about-credentials__item p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--silver);
  margin: 0;
}

.page-about .about-credentials__note {
  margin-top: 28px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
  background: var(--bg-card);
  border-left: 3px solid var(--silver);
  padding: 16px 18px;
}

.page-about .about-credentials__note a {
  color: var(--accent);
  text-decoration: none;
}

.page-about .about-credentials__note a:hover {
  text-decoration: underline;
}

/* ---------- 继续探索 ---------- */
.page-about .about-next {
  padding: 56px 0 88px;
}

.page-about .about-next__panel {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 20px;
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--about-panel-deep) 100%);
  border-left: 4px solid var(--accent);
  padding: 28px 24px;
}

.page-about .about-next__text p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--silver);
}

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

/* ---------- 响应式：平板 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero h1 {
    font-size: clamp(56px, 7vw, 72px);
  }

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

  .page-about .about-origin__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 44px;
  }

  .page-about .about-team__grid {
    grid-template-columns: 0.85fr 1.15fr;
    gap: 48px;
  }

  .page-about .about-team__text {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-team__media {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-ecosystem__grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 48px;
  }

  .page-about .about-ecosystem__text {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-ecosystem__media {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-credentials__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

/* ---------- 响应式：桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1fr 320px;
    gap: 56px;
  }

  .page-about .about-timeline__list {
    padding: 0;
  }

  .page-about .about-timeline__list::before {
    left: 50%;
    top: 10px;
    bottom: 10px;
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 1fr 120px 1fr;
    gap: 28px;
    align-items: center;
    margin-bottom: 34px;
  }

  .page-about .about-timeline__item::before {
    left: 50%;
    top: 50%;
    transform: translate(-50%, -50%) rotate(45deg);
    width: 13px;
    height: 13px;
    background: var(--accent);
    border: 3px solid var(--bg-darker);
    z-index: 2;
  }

  .page-about .about-timeline__year {
    grid-column: 2;
    grid-row: 1;
    justify-self: center;
    width: 88px;
    text-align: center;
    margin-bottom: 0;
    clip-path: polygon(8px 0, calc(100% - 8px) 0, 100% 50%, calc(100% - 8px) 100%, 8px 100%, 0 50%);
  }

  .page-about .about-timeline__card {
    grid-column: 1;
    grid-row: 1;
    text-align: right;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__card {
    grid-column: 3;
    grid-row: 1;
    text-align: left;
  }

  .page-about .about-timeline__card:hover {
    transform: translateX(6px);
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__card:hover {
    transform: translateX(-6px);
  }
}

/* ---------- 响应式：大屏细节放大 ---------- */
@media (min-width: 1024px) {
  .page-about .about-section {
    padding: 92px 0;
  }

  .page-about .about-section__head .section-index {
    font-size: 64px;
  }

  .page-about .about-section__head h2 {
    font-size: 44px;
  }

  .page-about .about-next__panel {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    padding: 32px 36px;
  }
}