.page-about {
  --about-radius: var(--radius);
  --about-gap: clamp(18px, 3vw, 32px);
  display: block;
  background: var(--bg);
  color: var(--mist);
}

.page-about .section {
  padding-block: clamp(44px, 6.5vw, 92px);
}

.page-about .section__desc {
  margin: 14px 0 0;
  max-width: 52em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(115% 85% at 88% -6%, rgba(45, 245, 208, 0.16), transparent 56%),
    linear-gradient(168deg, #0B2A20 0%, #061A14 64%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -16%;
  width: 58%;
  height: 168%;
  background: linear-gradient(140deg, rgba(255, 154, 61, 0.11), rgba(45, 245, 208, 0.05) 48%, transparent 76%);
  transform: rotate(-11deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(234, 246, 241, 0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(234, 246, 241, 0.045) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(200deg, rgba(0, 0, 0, 0.65), transparent 62%);
  mask-image: linear-gradient(200deg, rgba(0, 0, 0, 0.65), transparent 62%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  gap: clamp(28px, 4.5vw, 52px);
  padding-block: clamp(28px, 5vw, 66px) clamp(34px, 5vw, 76px);
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-size: clamp(33px, 6.4vw, 64px);
  line-height: 1.03;
  letter-spacing: -0.025em;
  font-weight: 800;
  color: var(--mist);
  max-width: 14em;
}

.page-about .about-lead {
  margin: 18px 0 0;
  max-width: 44em;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--haze);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin: 30px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-hero__facts dt {
  margin-bottom: 8px;
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.page-about .about-hero__facts dd {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-hero__facts .num {
  font-family: var(--font-data);
  font-size: clamp(26px, 3.6vw, 40px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-hero__facts .unit {
  font-size: 12px;
  color: var(--haze);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line-strong);
  border-radius: var(--about-radius);
  background: var(--frame);
  box-shadow: var(--shadow);
  transform: rotate(-1.6deg);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__media figcaption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--bg);
  background: var(--cyan);
}

/* ---------- 通用图形框 ---------- */
.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--frame);
  box-shadow: var(--shadow);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  padding: 10px 14px;
  border-top: 1px solid var(--line);
  font-size: 12px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 品牌起点 ---------- */
.page-about .position-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-position__body {
  padding: clamp(20px, 3vw, 34px);
}

.page-about .about-position__body p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--haze);
}

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

.page-about .about-note {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-left: 2px solid var(--orange);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, rgba(255, 154, 61, 0.12), rgba(11, 42, 32, 0.7) 70%);
}

.page-about .about-note__label {
  margin: 0 0 10px;
  font-size: 11.5px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .about-note p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--haze);
}

/* ---------- 三条主线 ---------- */
.page-about .mainline {
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .mainline .tabs {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 4px;
  scrollbar-width: none;
}

.page-about .mainline .tabs::-webkit-scrollbar {
  display: none;
}

.page-about .mainline .tab {
  flex: 0 0 auto;
  padding: 10px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: transparent;
  color: var(--haze);
  font-family: var(--font-body);
  font-size: 13.5px;
  line-height: 1.4;
  cursor: pointer;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .mainline .tab:hover {
  border-color: rgba(45, 245, 208, 0.55);
  color: var(--mist);
}

.page-about .mainline .tab[aria-selected="true"] {
  background: var(--cyan);
  border-color: var(--cyan);
  color: var(--bg);
  font-weight: 600;
}

.page-about .mainline .tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .mainline .tab-panel {
  margin-top: 18px;
  padding: clamp(20px, 3.2vw, 36px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(170deg, #0B2A20, #081F19);
  box-shadow: var(--shadow);
}

.page-about .mainline .tab-panel h3 {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(21px, 2.6vw, 28px);
  line-height: 1.2;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .mainline .tab-panel p {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.82;
  color: var(--haze);
  max-width: 50em;
}

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

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--haze);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 9px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 发展历程 ---------- */
.page-about .history-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(20px, 3vw, 32px);
}

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

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, rgba(45, 245, 208, 0.32) 48%, rgba(45, 245, 208, 0.04) 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(20px, 2.6vw, 30px) 34px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--bg);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(45, 245, 208, 0.09);
}

.page-about .tl-item:last-child::before {
  border-color: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 154, 61, 0.13);
}

.page-about .tl-item__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 12px;
}

.page-about .tl-year {
  font-family: var(--font-data);
  font-size: clamp(20px, 2.6vw, 26px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .tl-item:last-child .tl-year {
  color: var(--orange);
}

.page-about .tl-item__head h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.2vw, 22px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .tl-item p {
  margin: 9px 0 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--haze);
}

.page-about .tl-item p.tl-item__more {
  color: var(--muted);
  border-left: 1px solid var(--line-strong);
  padding-left: 12px;
  font-size: 13.5px;
}

@media (hover: hover) and (pointer: fine) {
  .page-about .tl-item p.tl-item__more {
    max-height: 0;
    opacity: 0;
    margin-top: 0;
    padding-top: 0;
    padding-bottom: 0;
    border-left-color: transparent;
    overflow: hidden;
    transition: max-height 0.36s var(--ease), opacity 0.3s var(--ease),
      margin-top 0.3s var(--ease), padding 0.3s var(--ease), border-color 0.3s var(--ease);
  }

  .page-about .tl-item:hover p.tl-item__more,
  .page-about .tl-item:focus-within p.tl-item__more {
    max-height: 190px;
    opacity: 1;
    margin-top: 10px;
    padding-top: 2px;
    padding-bottom: 2px;
    border-left-color: var(--line-strong);
  }
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .team-copy p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--haze);
}

.page-about .team-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .team-stats .num {
  display: block;
  font-family: var(--font-data);
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .team-stats .label {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.55;
  color: var(--muted);
}

/* ---------- 品质 ---------- */
.page-about .quality-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .quality-card {
  padding: clamp(18px, 2.6vw, 26px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--panel);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .quality-card:hover {
  border-color: rgba(45, 245, 208, 0.5);
  transform: translateY(-3px);
}

.page-about .quality-card__no {
  font-family: var(--font-data);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .quality-card h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  line-height: 1.3;
  color: var(--mist);
}

.page-about .quality-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--haze);
}

/* ---------- 合作生态 ---------- */
.page-about .partner-grid {
  display: grid;
  gap: var(--about-gap);
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .partner-card {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 12px;
  padding: clamp(22px, 3vw, 34px);
  background: linear-gradient(155deg, rgba(45, 245, 208, 0.1), #0B2A20 68%);
}

.page-about .partner-card__num {
  font-family: var(--font-data);
  font-size: clamp(46px, 7vw, 76px);
  font-weight: 600;
  line-height: 1;
  color: var(--cyan);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--haze);
}

.page-about .award-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .award-list li {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: rgba(19, 47, 54, 0.5);
  font-size: 14px;
  line-height: 1.72;
  color: var(--haze);
}

.page-about .award-list .tag {
  flex: 0 0 auto;
}

.page-about .about-partners__note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 60em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--haze);
}

/* ---------- 下一步 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(22px, 3.2vw, 38px);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: linear-gradient(160deg, #0B2A20, #061A14);
  text-decoration: none;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .next-card:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .next-card--warm {
  background: linear-gradient(160deg, rgba(255, 154, 61, 0.15), #061A14 72%);
}

.page-about .next-card--warm:hover {
  border-color: var(--orange);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .next-card__kicker {
  font-size: 11.5px;
  letter-spacing: 0.18em;
  color: var(--cyan);
}

.page-about .next-card--warm .next-card__kicker {
  color: var(--orange);
}

.page-about .next-card h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(22px, 2.8vw, 30px);
  line-height: 1.2;
  color: var(--mist);
}

.page-about .next-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--haze);
}

.page-about .next-card__arrow {
  margin-top: 6px;
  font-size: 14px;
  color: var(--mist);
  transition: color 0.2s var(--ease);
}

.page-about .next-card:hover .next-card__arrow {
  color: var(--cyan);
}

.page-about .next-card--warm:hover .next-card__arrow {
  color: var(--orange);
}

.page-about .about-next__contact {
  margin: 24px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 滚动显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .quality-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
  }

  .page-about .position-grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .history-grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.96fr) minmax(0, 1.04fr);
    align-items: center;
  }

  .page-about .partner-grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
  }
}

@media (min-width: 1080px) {
  .page-about .quality-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }

  .page-about .quality-card:hover,
  .page-about .next-card:hover {
    transform: none;
  }

  .page-about .tl-item p.tl-item__more {
    max-height: none !important;
    opacity: 1 !important;
  }
}