.page-about {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  background: var(--ink-green);
  color: var(--paper);
  padding-top: calc(var(--header-h) + clamp(44px, 8vw, 108px));
  padding-bottom: clamp(48px, 7vw, 104px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image: linear-gradient(90deg, rgba(247, 241, 230, 0.07) 1px, transparent 1px);
  background-size: clamp(84px, 12vw, 176px) 100%;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: clamp(300px, 50vw, 700px);
  aspect-ratio: 1;
  z-index: 0;
  background: radial-gradient(circle at center, rgba(52, 231, 206, 0.2), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero-trail {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 11%;
  height: 2px;
  z-index: 0;
  background: linear-gradient(90deg, transparent, var(--orange) 26%, var(--orange) 72%, transparent);
  transform: skewY(-2.2deg);
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .breadcrumb,
.page-about .about-hero .breadcrumb a {
  color: rgba(247, 241, 230, 0.6);
}

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

.page-about .about-hero .eyebrow {
  margin: clamp(20px, 3vw, 32px) 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-hero-title {
  margin: clamp(14px, 2.4vw, 24px) 0 0;
  font-size: clamp(36px, 8vw, 90px);
  line-height: 1.03;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .about-hero-foot {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(30px, 5vw, 58px);
  padding-top: clamp(24px, 3vw, 36px);
  border-top: 1px solid rgba(247, 241, 230, 0.18);
}

@media (min-width: 880px) {
  .page-about .about-hero-foot {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: end;
  }
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 46ch;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.78;
  color: rgba(247, 241, 230, 0.82);
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(10px, 2vw, 26px);
  margin: 0;
}

.page-about .about-stat {
  padding-left: clamp(10px, 1.4vw, 18px);
  border-left: 1px solid rgba(247, 241, 230, 0.2);
}

.page-about .about-stat-label {
  margin: 0;
  font-size: 12px;
  line-height: 1.5;
  color: rgba(247, 241, 230, 0.62);
}

.page-about .about-stat-num {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4.4vw, 50px);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--cyan);
}

.page-about .about-stat-num small {
  margin-left: 2px;
  font-size: 0.42em;
  font-weight: 700;
  color: var(--orange);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding-top: clamp(48px, 8vw, 104px);
  padding-bottom: clamp(56px, 9vw, 120px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 56px);
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 218px) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 88px);
    align-items: start;
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  padding-top: 14px;
  border-top: 2px solid var(--ink);
}

@media (min-width: 1000px) {
  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 28px);
  }
}

.page-about .about-index-title {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.page-about .about-index-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 0 clamp(16px, 2vw, 24px);
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (min-width: 1000px) {
  .page-about .about-index-list {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
  }
}

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: color 0.3s var(--ease), padding-left 0.3s var(--ease);
}

.page-about .about-index-list a:hover {
  color: var(--orange);
  padding-left: 6px;
}

.page-about .about-index-list .idx {
  flex: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gray);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding-block: clamp(36px, 5vw, 62px);
  border-top: 1px solid var(--rule);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: none;
}

.page-about .about-sec-head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 22px);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .about-sec-num {
  flex: none;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-sec-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.18;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--ink);
  text-wrap: balance;
}

.page-about .about-pull {
  margin: clamp(20px, 3vw, 30px) 0;
  padding: 4px 0 4px clamp(16px, 2.4vw, 26px);
  border-left: 4px solid var(--orange);
  font-size: clamp(17px, 2.1vw, 22px);
  line-height: 1.6;
  font-weight: 700;
  color: var(--ink-green);
}

/* ---------- 团队卡片 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  margin-top: clamp(24px, 3vw, 40px);
}

@media (min-width: 720px) {
  .page-about .about-team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .team-card {
  padding: clamp(18px, 2.4vw, 26px) clamp(16px, 2vw, 22px) clamp(20px, 2.6vw, 28px);
  background: var(--paper-layer);
  border-top: 3px solid var(--green-mid);
  transition: transform 0.45s var(--ease), border-color 0.45s var(--ease), background 0.45s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-6px);
  background: var(--white);
  border-top-color: var(--orange);
}

.page-about .team-card-code {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.page-about .team-card-name {
  margin: 10px 0 0;
  font-size: clamp(18px, 2vw, 20px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .team-card-size {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 34px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
}

.page-about .team-card-duties {
  display: grid;
  gap: 7px;
  margin: 16px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team-card-duties li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--gray);
  transition: color 0.4s var(--ease);
}

.page-about .team-card-duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 1px;
  background: var(--orange);
  transition: width 0.4s var(--ease);
}

.page-about .team-card:hover .team-card-duties li {
  color: var(--ink);
}

.page-about .team-card:hover .team-card-duties li::before {
  width: 10px;
}

/* ---------- 图像容器 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 44px) 0 0;
  padding: 10px;
  background: var(--paper-layer);
  border: 1px solid var(--rule);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--white);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--gray);
}

/* ---------- 评测维度 ---------- */
.page-about .std-list {
  margin: clamp(22px, 3vw, 36px) 0 0;
  border-top: 1px solid var(--rule);
}

.page-about .std-item {
  border-bottom: 1px solid var(--rule);
}

.page-about .std-summary {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 20px);
  padding: clamp(14px, 2vw, 20px) 0;
  cursor: pointer;
  list-style: none;
}

.page-about .std-summary::-webkit-details-marker {
  display: none;
}

.page-about .std-code {
  flex: none;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.page-about .std-name {
  flex: 1;
  font-size: clamp(16px, 2vw, 20px);
  font-weight: 700;
  color: var(--ink);
  transition: color 0.3s var(--ease);
}

.page-about .std-summary:hover .std-name,
.page-about .std-item[open] .std-name {
  color: var(--orange);
}

.page-about .std-toggle {
  position: relative;
  flex: none;
  width: 14px;
  height: 14px;
}

.page-about .std-toggle::before,
.page-about .std-toggle::after {
  content: "";
  position: absolute;
  background: var(--orange);
  transition: transform 0.35s var(--ease);
}

.page-about .std-toggle::before {
  left: 0;
  top: 6.5px;
  width: 14px;
  height: 1.5px;
}

.page-about .std-toggle::after {
  left: 6.25px;
  top: 0;
  width: 1.5px;
  height: 14px;
}

.page-about .std-item[open] .std-toggle::after {
  transform: scaleY(0);
}

.page-about .std-body {
  padding-bottom: clamp(18px, 2.6vw, 26px);
}

.page-about .std-body p {
  margin: 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

/* ---------- 产品线 ---------- */
.page-about .line-list {
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .line-item {
  display: grid;
  gap: 10px 22px;
  padding: clamp(18px, 2.6vw, 28px);
  background: var(--white);
  border-left: 4px solid var(--green-mid);
  transition: border-color 0.4s var(--ease), background 0.4s var(--ease);
}

.page-about .line-item:hover {
  border-left-color: var(--orange);
  background: var(--paper-layer);
}

@media (min-width: 780px) {
  .page-about .line-item {
    grid-template-columns: 74px minmax(0, 1fr);
    align-items: start;
  }
}

.page-about .line-num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .line-title {
  margin: 0;
  font-size: clamp(19px, 2.4vw, 24px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .line-desc {
  margin: 10px 0 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .line-link {
  display: inline-block;
  margin-top: 14px;
  padding-bottom: 3px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--green-mid);
  text-decoration: none;
  border-bottom: 1px solid var(--rule);
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .line-link:hover {
  color: var(--orange);
  border-bottom-color: var(--orange);
}

/* ---------- 生态数据 ---------- */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(138px, 1fr));
  gap: clamp(16px, 2.4vw, 28px);
  margin-top: clamp(24px, 3vw, 38px);
  padding: clamp(22px, 3.2vw, 36px);
  background: var(--ink-green);
}

.page-about .eco-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 4vw, 44px);
  line-height: 1;
  color: var(--cyan);
}

.page-about .eco-num em {
  font-style: normal;
  margin-left: 2px;
  font-size: 0.45em;
  color: var(--orange);
}

.page-about .eco-label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(247, 241, 230, 0.66);
}

/* ---------- 演进时间轴 ---------- */
.page-about .about-timeline {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline-node {
  position: relative;
  display: grid;
  grid-template-columns: 22px minmax(0, 1fr);
  gap: 0 16px;
  padding-bottom: clamp(20px, 2.8vw, 32px);
}

.page-about .timeline-node:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 22px;
  bottom: 4px;
  width: 1px;
  background: var(--rule);
}

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

.page-about .timeline-dot {
  position: relative;
  z-index: 1;
  width: 11px;
  height: 11px;
  margin-top: 6px;
  box-sizing: content-box;
  border: 2px solid var(--green-mid);
  border-radius: 50%;
  background: var(--paper);
}

.page-about .timeline-node:last-child .timeline-dot {
  border-color: var(--orange);
}

.page-about .timeline-meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.page-about .timeline-title {
  margin: 8px 0 0;
  font-size: clamp(17px, 2vw, 20px);
  font-weight: 800;
  color: var(--ink);
}

.page-about .timeline-text {
  margin: 8px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--gray);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(38px, 5vw, 66px);
  padding: clamp(26px, 4vw, 44px);
  background: var(--orange-soft);
  border-left: 4px solid var(--orange);
}

@media (min-width: 880px) {
  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

.page-about .about-cta-title {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 800;
  line-height: 1.2;
  color: var(--ink-green);
}

.page-about .about-cta-text p {
  margin: 12px 0 0;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

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

@media (max-width: 879px) {
  .page-about .about-cta-actions {
    width: 100%;
  }

  .page-about .about-cta-actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}