/* ===== 页面专属变量 ===== */
.page-about {
  --cut-corner: 14px;
  --timeline-axis: 1.25rem;
  --timeline-node: 12px;
}

.page-about .section-head {
  max-width: 46rem;
  margin-bottom: 2.5rem;
}

/* ===== 首屏：品牌宣言 ===== */
.page-about .about-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: calc(100vh - var(--header-h, 4.5rem));
  min-height: calc(100svh - var(--header-h, 4.5rem));
  color: var(--white);
  overflow: hidden;
  padding: calc(var(--header-h, 4.5rem) + 2.5rem) 0 4rem;
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.page-about .about-hero__scrim {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    radial-gradient(circle at 78% 28%, rgba(255, 111, 0, 0.20), transparent 42%),
    linear-gradient(180deg, rgba(10, 31, 68, 0.44) 0%, rgba(10, 31, 68, 0.78) 52%, var(--primary) 100%);
}

.page-about .about-hero__content {
  position: relative;
  z-index: 2;
  max-width: 52rem;
  margin-inline: auto;
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  margin-bottom: 1.4rem;
  font-family: var(--font-data);
  font-size: 0.78rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 30px;
  height: 2px;
  background: var(--secondary);
}

.page-about .about-hero__title {
  margin: 0 0 1.75rem;
  font-family: var(--font-head);
  font-size: clamp(2.75rem, 8.5vw, 5.5rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 110px;
  height: 8px;
  margin-top: 1.9rem;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  clip-path: polygon(0 0, 100% 0, calc(100% - 14px) 100%, 0 100%);
}

.page-about .about-hero__lead {
  max-width: 34rem;
  margin: 0;
  font-size: clamp(1rem, 1.4vw, 1.15rem);
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.88);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem 1.1rem;
  margin-top: 2rem;
}

.page-about .about-hero__meta-item {
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.80);
  border-left: 3px solid var(--secondary);
  padding-left: 0.6rem;
}

.page-about .about-hero__scroll-hint {
  position: absolute;
  right: 1.25rem;
  bottom: 2.25rem;
  z-index: 3;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-data);
  font-size: 0.65rem;
  letter-spacing: 0.28em;
  color: rgba(255, 255, 255, 0.55);
}

.page-about .about-hero__scroll-hint span:first-child {
  writing-mode: vertical-rl;
}

.page-about .about-hero__scroll-line {
  width: 2px;
  height: 52px;
  background: linear-gradient(to bottom, var(--accent), transparent);
}

/* ===== 品牌起源与使命 ===== */
.page-about .about-origin__grid {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.5rem;
}

.page-about .about-origin__body p {
  margin: 0 0 1.25rem;
  line-height: 1.85;
  color: var(--text);
  font-size: 1rem;
}

.page-about .about-origin__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-origin__milestones {
  display: grid;
  gap: 0.9rem;
  align-content: start;
}

.page-about .about-origin__milestone {
  display: grid;
  gap: 0.35rem;
  padding: 1.1rem 1.15rem;
  background: var(--white);
  border: 1px solid var(--border);
  border-left: 4px solid var(--secondary);
  box-shadow: 0 4px 14px rgba(10, 31, 68, 0.05);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-origin__milestone:hover {
  transform: translateX(4px);
  box-shadow: 0 8px 20px rgba(10, 31, 68, 0.10);
}

.page-about .about-origin__num {
  font-family: var(--font-data);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--primary);
}

.page-about .about-origin__label {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ===== 版本演进时间线 ===== */
.page-about .about-timeline {
  position: relative;
  color: var(--white);
  overflow: hidden;
  padding: var(--section-space, 5rem) 0;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  right: -8%;
  top: 12%;
  width: 260px;
  height: 380px;
  background: linear-gradient(135deg, transparent 0 49%, rgba(0, 194, 168, 0.20) 50% 51%, transparent 52%);
  pointer-events: none;
}

.page-about .about-timeline__head {
  margin-bottom: 3rem;
}

.page-about .section-label--light {
  color: rgba(255, 255, 255, 0.62);
}

.page-about .section-title--light {
  color: var(--white);
}

.page-about .about-timeline__lead {
  margin-top: 1rem;
  color: rgba(255, 255, 255, 0.68);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline__list::before {
  content: "";
  position: absolute;
  left: var(--timeline-axis);
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--secondary), var(--accent), rgba(255, 255, 255, 0.16));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 2.6rem calc(var(--timeline-axis) + 1.75rem);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(var(--timeline-axis) - (var(--timeline-node) / 2));
  top: 0.45rem;
  width: var(--timeline-node);
  height: var(--timeline-node);
  border-radius: 50%;
  background: var(--primary);
  border: 3px solid var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 194, 168, 0.16);
}

.page-about .about-timeline__stamp {
  display: inline-flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-bottom: 0.8rem;
}

.page-about .about-timeline__version {
  font-family: var(--font-head);
  font-size: 1.05rem;
  color: var(--accent);
}

.page-about .about-timeline__phase {
  font-family: var(--font-data);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.62);
}

.page-about .about-timeline__card {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  padding: 1.4rem 1.4rem;
  clip-path: polygon(0 0, calc(100% - var(--cut-corner)) 0, 100% var(--cut-corner), 100% 100%, var(--cut-corner) 100%, 0 calc(100% - var(--cut-corner)));
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .about-timeline__card-title {
  margin: 0 0 0.55rem;
  font-family: var(--font-head);
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-timeline__card--latest {
  border-color: rgba(0, 194, 168, 0.44);
  background: linear-gradient(145deg, rgba(0, 194, 168, 0.16), rgba(255, 111, 0, 0.08) 62%, rgba(255, 255, 255, 0.04));
}

.page-about .about-timeline__badge {
  display: inline-block;
  margin-bottom: 0.8rem;
  padding: 0.32rem 0.6rem;
  font-family: var(--font-data);
  font-size: 0.64rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #04112b;
  background: var(--accent);
}

/* ===== 数据能力与覆盖范围 ===== */
.page-about .about-data__layout {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.5rem;
}

.page-about .about-data__metrics .data-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about .about-data__metrics .data-cell {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 1.5rem 0.75rem;
  text-align: center;
  clip-path: polygon(0 0, calc(100% - var(--cut-corner)) 0, 100% var(--cut-corner), 100% 100%, var(--cut-corner) 100%, 0 calc(100% - var(--cut-corner)));
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about .about-data__metrics .data-cell:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 24px rgba(10, 31, 68, 0.10);
}

.page-about .about-data__metrics .data-number {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(1.7rem, 3vw, 2.2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--primary);
}

.page-about .about-data__metrics .data-caption {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.page-about .about-data__desc {
  margin: 1.6rem 0 0;
  max-width: 28rem;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-data__visual .image-frame {
  position: relative;
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about .about-data__visual img,
.page-about .about-team__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .about-data__visual figcaption,
.page-about .about-team__visual figcaption {
  margin-top: 0.6rem;
}

/* ===== 团队介绍 ===== */
.page-about .about-team__layout {
  display: grid;
  gap: 2.5rem;
  margin-top: 2.5rem;
}

.page-about .about-team__text p {
  margin: 0 0 1.25rem;
  line-height: 1.8;
  color: var(--text);
  font-size: 1rem;
}

.page-about .about-team__roles {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.75rem;
}

.page-about .about-team__role {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 0.35rem 0.9rem;
  align-items: center;
  padding: 0.5rem 0;
}

.page-about .about-team__role-label {
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--text);
}

.page-about .about-team__role-value {
  font-family: var(--font-data);
  font-size: 0.85rem;
  color: var(--secondary);
}

.page-about .about-team__role-bar {
  grid-column: 1 / -1;
  height: 6px;
  background: rgba(10, 31, 68, 0.08);
  overflow: hidden;
}

.page-about .about-team__role-bar span {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
}

.page-about .about-team__note {
  margin-top: 1.25rem;
  padding: 0.9rem 1.1rem;
  border-left: 4px solid var(--accent);
  background: rgba(0, 194, 168, 0.08);
  font-size: 0.86rem;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-team__visual .image-frame {
  position: relative;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

/* ===== 品牌荣誉与认证 ===== */
.page-about .about-honors__grid {
  display: grid;
  gap: 1.4rem;
  margin-top: 2.5rem;
}

.page-about .about-honors__item {
  position: relative;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  padding: 2.1rem 1.6rem 1.7rem;
  clip-path: polygon(0 0, calc(100% - var(--cut-corner)) 0, 100% var(--cut-corner), 100% 100%, var(--cut-corner) 100%, 0 calc(100% - var(--cut-corner)));
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-honors__item:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 30px rgba(10, 31, 68, 0.10);
}

.page-about .about-honors__index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  margin-bottom: 1.1rem;
  font-family: var(--font-data);
  font-size: 0.85rem;
  font-weight: 700;
  color: var(--secondary);
  background: var(--white);
  border: 1px solid var(--border);
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 10px 100%, 0 calc(100% - 10px));
}

.page-about .about-honors__title {
  margin: 0 0 0.65rem;
  font-family: var(--font-head);
  font-size: 1.05rem;
  line-height: 1.45;
  color: var(--primary);
}

.page-about .about-honors__item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .about-honors__note {
  margin-top: 1.75rem;
  padding: 1rem 1.25rem;
  background: linear-gradient(90deg, rgba(255, 111, 0, 0.08), rgba(0, 194, 168, 0.08));
  border-left: 3px solid var(--secondary);
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--muted);
}

/* ===== 品牌信任与内链 ===== */
.page-about .about-trust {
  position: relative;
  padding: var(--section-space, 5rem) 0;
  color: var(--white);
  background:
    radial-gradient(circle at 82% 28%, rgba(0, 194, 168, 0.16), transparent 42%),
    linear-gradient(135deg, var(--primary), var(--primary-light));
  overflow: hidden;
}

.page-about .about-trust::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: linear-gradient(135deg, transparent 47%, rgba(255, 111, 0, 0.30) 50%, rgba(255, 111, 0, 0.30) 56%, transparent 59%);
  pointer-events: none;
}

.page-about .about-trust::after {
  content: "DATA";
  position: absolute;
  right: -2%;
  bottom: -7%;
  font-family: var(--font-head);
  font-size: clamp(6rem, 18vw, 14rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: rgba(255, 255, 255, 0.04);
  pointer-events: none;
}

.page-about .about-trust__title {
  position: relative;
  z-index: 1;
  margin: 0 0 1.25rem;
  max-width: 30rem;
  font-family: var(--font-head);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.1;
}

.page-about .about-trust__statement {
  position: relative;
  z-index: 1;
  max-width: 40rem;
  margin: 0 0 2.25rem;
  font-size: 1rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .about-trust__links {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
}

/* ===== 桌面端布局与时间线交替 ===== */
@media (min-width: 768px) {
  .page-about .about-origin__grid {
    grid-template-columns: 1.25fr 0.85fr;
    gap: 4rem;
    align-items: start;
  }

  .page-about .about-data__layout {
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    margin-top: 3rem;
  }

  .page-about .about-data__metrics .data-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .about-data__desc {
    margin-top: 1.75rem;
  }

  .page-about .about-team__layout {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 4rem;
    align-items: center;
    margin-top: 3rem;
  }

  .page-about .about-honors__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.6rem;
  }

  .page-about .about-hero__scroll-hint {
    right: 2rem;
    bottom: 3rem;
  }
}

@media (min-width: 960px) {
  .page-about .about-timeline__list::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .about-timeline__item {
    width: 50%;
    padding: 0 3rem 3.5rem 0;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 3.5rem 3rem;
  }

  .page-about .about-timeline__item:last-child,
  .page-about .about-timeline__item:nth-last-child(2) {
    padding-bottom: 0;
  }

  .page-about .about-timeline__item::before {
    left: auto;
    right: -6px;
  }

  .page-about .about-timeline__item:nth-child(even)::before {
    right: auto;
    left: -6px;
  }

  .page-about .about-timeline__item:nth-child(odd) {
    text-align: right;
  }

  .page-about .about-timeline__stamp {
    justify-content: flex-start;
  }

  .page-about .about-timeline__item:nth-child(odd) .about-timeline__stamp {
    justify-content: flex-end;
  }

  .page-about .about-timeline__card {
    text-align: left;
  }

  .page-about .about-timeline__card h3 {
    text-align: left;
  }

  .page-about .about-timeline__card p {
    text-align: left;
  }
}