.page-about {
  --about-pad: clamp(56px, 9vw, 128px);
  --about-gap: clamp(20px, 3vw, 40px);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 7vw, 88px);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(28px, 4vw, 56px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: end;
}

.page-about .about-hero__copy {
  max-width: 46ch;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(34px, 6.4vw, 84px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  margin: 16px 0 0;
  color: var(--paper);
}

.page-about .about-hero__lead {
  font-family: var(--font-read);
  font-size: clamp(15px, 1.15vw, 17px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .82);
  margin: 22px 0 0;
}

.page-about .about-hero__cta {
  margin-top: clamp(24px, 3vw, 36px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__visual {
  position: relative;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  gap: 12px;
  padding: clamp(24px, 3vw, 40px);
  min-height: clamp(260px, 32vw, 400px);
  background-color: var(--panel);
  background-image:
    repeating-linear-gradient(
      90deg,
      transparent 0,
      transparent 17px,
      rgba(224, 169, 43, .07) 17px,
      rgba(224, 169, 43, .07) 18px
    ),
    repeating-linear-gradient(
      0deg,
      transparent 0,
      transparent 34px,
      rgba(242, 237, 228, .045) 34px,
      rgba(242, 237, 228, .045) 35px
    );
  border: 1px solid var(--line-2);
  box-shadow: var(--shadow-panel);
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 8px;
  border: 1px solid rgba(192, 70, 44, .35);
  pointer-events: none;
}

.page-about .about-hero__big {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(96px, 16vw, 200px);
  line-height: .82;
  color: var(--red);
  letter-spacing: -0.03em;
}

.page-about .about-hero__label {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--index);
  text-transform: uppercase;
}

.page-about .about-hero__foot {
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--jade);
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 1fr);
    gap: clamp(32px, 5vw, 72px);
  }
}

/* ---------- 章节索引带 ---------- */
.page-about .about-strip {
  position: sticky;
  top: calc(var(--nav-h) + 2px);
  z-index: 6;
  background: linear-gradient(180deg, rgba(23, 24, 26, .96) 0%, rgba(23, 24, 26, .82) 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  backdrop-filter: blur(6px);
}

.page-about .about-strip .index-strip {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 12px 0;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-strip .index-strip__item {
  flex: 0 0 auto;
  scroll-snap-align: start;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--index);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid var(--line);
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .about-strip .index-strip__item:hover,
.page-about .about-strip .index-strip__item:focus-visible {
  color: var(--paper);
  border-color: var(--line-2);
}

.page-about .about-strip .index-strip__item.is-active {
  color: var(--red-lit);
  border-color: rgba(224, 112, 79, .5);
  background: rgba(192, 70, 44, .08);
}

/* ---------- 通用章节 ---------- */
.page-about .section {
  padding: var(--about-pad) 0 0;
}

.page-about .section .section__head {
  max-width: 62ch;
  margin-bottom: clamp(28px, 4vw, 52px);
}

.page-about .section .t-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.4vw, 48px);
  line-height: 1.18;
  letter-spacing: -0.005em;
  margin: 12px 0 0;
  color: var(--paper);
}

.page-about .about-lead {
  font-family: var(--font-read);
  font-size: clamp(15px, 1.1vw, 17px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .78);
  margin: 18px 0 0;
}

/* ---------- 工序纵列 ---------- */
.page-about .process-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 14px 0;
  margin-bottom: clamp(20px, 3vw, 32px);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .process-jump a {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .06em;
  color: var(--index);
  text-decoration: none;
  padding: 4px 9px;
  border: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .process-jump a:hover,
.page-about .process-jump a:focus-visible {
  color: var(--paper);
  border-color: var(--red);
}

.page-about .process-list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: proc;
}

.page-about .process-item {
  display: grid;
  grid-template-columns: 48px minmax(0, 1fr);
  gap: clamp(14px, 3vw, 40px);
  padding: clamp(22px, 3vw, 34px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: calc(var(--nav-h) + 84px);
}

.page-about .process-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .process-item__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 40px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--jade);
}

.page-about .process-item__body {
  min-width: 0;
}

.page-about .process-item__stage {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--index);
  border-left: 2px solid var(--line-2);
  padding-left: 8px;
  margin-bottom: 8px;
}

.page-about .process-item[data-stage="prep"] .process-item__stage { border-left-color: var(--jade); }
.page-about .process-item[data-stage="form"] .process-item__stage { border-left-color: var(--saffron); }
.page-about .process-item[data-stage="finish"] .process-item__stage { border-left-color: var(--red); }
.page-about .process-item[data-stage="check"] .process-item__stage { border-left-color: var(--index); }

.page-about .process-item__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(17px, 1.7vw, 22px);
  line-height: 1.4;
  margin: 0;
  color: var(--paper);
}

.page-about .process-item__desc {
  font-family: var(--font-read);
  font-size: clamp(14px, 1.05vw, 16px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .76);
  margin: 10px 0 0;
}

@media (min-width: 768px) {
  .page-about .process-item {
    grid-template-columns: 108px minmax(0, 1fr);
  }
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(28px, 4vw, 52px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-figure--wide img {
  aspect-ratio: 8 / 3;
}

.page-about .about-figure--panorama img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--portrait img {
  aspect-ratio: 5 / 7;
}

.page-about .about-figure .media__caption {
  margin-top: 12px;
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: .06em;
  line-height: 1.7;
  color: var(--index);
}

/* ---------- 四个阶段 ---------- */
.page-about .stage-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .stage-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding: clamp(24px, 3.4vw, 40px) 0;
  border-top: 1px solid var(--line);
}

.page-about .stage-item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .stage-item__range {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(22px, 2.6vw, 32px);
  letter-spacing: .02em;
  color: var(--saffron);
}

.page-about .stage-item[data-stage="prep"] .stage-item__range { color: var(--jade); }
.page-about .stage-item[data-stage="form"] .stage-item__range { color: var(--saffron); }
.page-about .stage-item[data-stage="finish"] .stage-item__range { color: var(--red-lit); }
.page-about .stage-item[data-stage="check"] .stage-item__range { color: var(--index); }

.page-about .stage-item__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(20px, 2.2vw, 28px);
  line-height: 1.25;
  margin: 0;
  color: var(--paper);
}

.page-about .stage-item__body p {
  font-family: var(--font-read);
  font-size: clamp(14px, 1.05vw, 16px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .78);
  margin: 12px 0 0;
}

.page-about .stage-item__meta {
  font-family: var(--font-ui);
  font-size: 12px !important;
  letter-spacing: .06em;
  color: var(--index) !important;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

@media (min-width: 768px) {
  .page-about .stage-item {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
  }
}

/* ---------- 质量控制 ---------- */
.page-about .quality-grid {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  grid-template-columns: 1fr;
}

.page-about .quality-card {
  padding: clamp(20px, 2.6vw, 32px);
  background: var(--paper-2);
  border: 1px solid var(--ink-line);
  box-shadow: var(--shadow-panel);
  color: var(--rule);
}

.page-about .quality-card__idx {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--red);
  border-bottom: 1px solid rgba(192, 70, 44, .4);
  padding-bottom: 3px;
}

.page-about .quality-card h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(17px, 1.7vw, 21px);
  line-height: 1.4;
  margin: 14px 0 0;
  color: var(--rule);
}

.page-about .quality-card p {
  font-family: var(--font-read);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(12, 13, 14, .78);
  margin: 10px 0 0;
}

@media (min-width: 700px) {
  .page-about .quality-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1100px) {
  .page-about .quality-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  grid-template-columns: 1fr;
  border-top: 1px solid var(--line);
}

.page-about .team-item {
  padding: clamp(22px, 3vw, 32px) 0;
  border-bottom: 1px solid var(--line);
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(16px, 3vw, 32px);
  row-gap: 8px;
  align-items: baseline;
}

.page-about .team-item__num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(28px, 3.6vw, 46px);
  line-height: .9;
  letter-spacing: -0.02em;
  color: var(--jade);
  grid-row: span 2;
}

.page-about .team-item__name {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(16px, 1.6vw, 20px);
  margin: 0;
  color: var(--paper);
}

.page-about .team-item p {
  font-family: var(--font-read);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 237, 228, .76);
  margin: 0;
  grid-column: 2;
}

@media (min-width: 900px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(28px, 5vw, 64px);
  }
}

/* ---------- 沿革时间线 ---------- */
.page-about .timeline-layout {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  grid-template-columns: 1fr;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 16px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(220px, 1fr);
  gap: clamp(18px, 2.5vw, 32px);
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
}

.page-about .timeline__node {
  position: relative;
  scroll-snap-align: start;
  border-top: 1px solid var(--line-2);
  padding-top: 22px;
}

.page-about .timeline__node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--saffron);
  box-shadow: 0 0 0 4px var(--ink);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(20px, 2.2vw, 28px);
  letter-spacing: .02em;
  color: var(--saffron);
}

.page-about .timeline__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.35;
  margin: 10px 0 0;
  color: var(--paper);
}

.page-about .timeline__node p {
  font-family: var(--font-read);
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(242, 237, 228, .74);
  margin: 8px 0 0;
}

.page-about .about-timeline__note {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding-top: 18px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-read);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 237, 228, .72);
}

.page-about .about-timeline__note a {
  color: var(--red-lit);
  text-decoration: none;
  border-bottom: 1px solid rgba(224, 112, 79, .45);
  transition: border-color var(--dur) var(--ease);
}

.page-about .about-timeline__note a:hover,
.page-about .about-timeline__note a:focus-visible {
  border-bottom-color: var(--red-lit);
}

@media (min-width: 1000px) {
  .page-about .timeline-layout {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, 1fr);
    align-items: start;
  }
}

/* ---------- 资质 ---------- */
.page-about .cert-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .cert-item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: clamp(22px, 3vw, 32px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .cert-item__year {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(19px, 2vw, 26px);
  letter-spacing: .02em;
  color: var(--saffron);
}

.page-about .cert-item__body h3 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(16px, 1.6vw, 21px);
  line-height: 1.35;
  margin: 0;
  color: var(--paper);
}

.page-about .cert-item__body p {
  font-family: var(--font-read);
  font-size: 14px;
  line-height: 1.85;
  color: rgba(242, 237, 228, .76);
  margin: 10px 0 0;
  max-width: 62ch;
}

@media (min-width: 768px) {
  .page-about .cert-item {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 48px);
    align-items: baseline;
  }
}

/* ---------- 收口 ---------- */
.page-about .about-outro {
  margin-top: clamp(32px, 4vw, 56px);
  padding: clamp(24px, 3.4vw, 40px);
  background: var(--panel);
  border: 1px solid var(--line-2);
  display: grid;
  gap: 20px;
}

.page-about .about-outro p {
  font-family: var(--font-read);
  font-size: clamp(14px, 1.05vw, 16px);
  line-height: 1.85;
  color: rgba(242, 237, 228, .82);
  margin: 0;
  max-width: 68ch;
}

.page-about .about-outro a {
  color: var(--red-lit);
  text-decoration: none;
  border-bottom: 1px solid rgba(224, 112, 79, .45);
}

.page-about .about-outro a:hover,
.page-about .about-outro a:focus-visible {
  border-bottom-color: var(--red-lit);
}

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

@media (min-width: 900px) {
  .page-about .about-outro {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
  }
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero__big {
    font-size: 76px;
  }
  .page-about .process-item {
    grid-template-columns: 40px minmax(0, 1fr);
  }
  .page-about .team-item {
    grid-template-columns: auto minmax(0, 1fr);
  }
  .page-about .timeline {
    grid-auto-columns: minmax(190px, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}
</main>