.page-about {
  --about-node: 28px;
  --about-col: 54px;
  --about-pad: clamp(52px, 7vw, 104px);
  background: var(--paper);
  color: var(--brown);
  overflow-x: hidden;
}

.page-about .about-link {
  color: var(--copper-deep);
  text-decoration: none;
  border-bottom: 1px solid var(--copper-soft);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.page-about .about-link:hover {
  color: var(--copper);
  border-bottom-color: var(--copper);
}
.page-about .about-board--ink .about-link {
  color: var(--cyan);
  border-bottom-color: rgba(87, 224, 210, 0.45);
}
.page-about .about-board--ink .about-link:hover {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--ink);
  color: var(--paper);
  padding: clamp(22px, 3vw, 40px) 0 clamp(44px, 6vw, 88px);
  border-bottom: 3px solid var(--copper);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: min(40vw, 460px);
  height: 100%;
  background: repeating-linear-gradient(-45deg, transparent 0 24px, rgba(87, 224, 210, 0.07) 24px 25px);
  pointer-events: none;
}
.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs {
  font-size: 13px;
  color: var(--veil-dim);
  margin-bottom: clamp(22px, 3vw, 34px);
}
.page-about .about-crumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  margin: 0;
  padding: 0;
}
.page-about .about-crumbs li + li {
  display: flex;
  gap: 8px;
}
.page-about .about-crumbs li + li::before {
  content: "/";
  color: var(--copper-soft);
}
.page-about .about-crumbs a {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.page-about .about-crumbs a:hover {
  color: var(--copper-soft);
  border-bottom-color: var(--copper-soft);
}
.page-about .about-crumbs li[aria-current] {
  color: var(--copper-soft);
}

.page-about .about-hero__eyebrow {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--copper-soft);
  margin: 0 0 clamp(16px, 2.2vw, 26px);
}

.page-about .about-hero__title {
  font-size: clamp(30px, 6.6vw, 74px);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
  margin: 0 0 clamp(28px, 4vw, 52px);
  max-width: 18em;
}

.page-about .about-hero__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
  border-top: 1px solid var(--rule-dark);
  padding-top: clamp(20px, 3vw, 34px);
}
@media (min-width: 900px) {
  .page-about .about-hero__row {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(32px, 5vw, 72px);
  }
}

.page-about .about-hero__lede {
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--veil);
  max-width: 48ch;
}
@media (min-width: 700px) {
  .page-about .about-hero__lede {
    font-size: 17px;
  }
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 30px) clamp(14px, 2vw, 24px);
}
.page-about .stat__num {
  display: block;
  font-size: clamp(28px, 4.4vw, 44px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}
.page-about .stat__num--copper {
  color: var(--copper-soft);
}
.page-about .stat__num--cyan {
  color: var(--cyan);
}
.page-about .stat__cap {
  display: block;
  margin-top: 9px;
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: 0.04em;
  color: var(--veil-dim);
}

/* ---------- 展板通用 ---------- */
.page-about .about-board {
  position: relative;
  padding: var(--about-pad) 0;
  background: var(--paper);
  color: var(--brown);
  border-top: 1px solid var(--rule);
}
.page-about .about-board--ink {
  background: var(--ink);
  color: var(--paper);
  border-top-color: var(--rule-dark);
}
.page-about .about-board--paper2 {
  background: var(--paper-2);
}

.page-about .about-board__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
}
@media (min-width: 860px) {
  .page-about .about-board__inner {
    grid-template-columns: var(--about-col) minmax(0, 1fr);
    gap: 0 clamp(22px, 3vw, 46px);
  }
  .page-about .about-board__inner::before {
    content: "";
    position: absolute;
    left: calc(var(--about-node) / 2 - 0.5px);
    top: 4px;
    bottom: -4px;
    width: 1px;
    background: var(--rule);
  }
  .page-about .about-board--ink .about-board__inner::before {
    background: var(--rule-dark);
  }
}

.page-about .about-node {
  display: inline-grid;
  place-items: center;
  width: var(--about-node);
  height: var(--about-node);
  background: var(--copper);
  color: var(--paper);
  font-size: 12px;
  font-weight: 500;
  line-height: 1;
  position: relative;
  z-index: 1;
  align-self: start;
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.page-about .about-board:hover .about-node {
  transform: translateY(-2px);
}

.page-about .about-board__body {
  min-width: 0;
}

.page-about .about-label {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--copper-deep);
  margin: 0 0 clamp(14px, 2vw, 22px);
  padding-bottom: 6px;
  border-bottom: 1px solid currentColor;
}
.page-about .about-board--ink .about-label {
  color: var(--copper-soft);
}

.page-about .about-h2 {
  font-size: clamp(24px, 3.8vw, 44px);
  font-weight: 900;
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--brown);
  margin: 0 0 clamp(18px, 2.6vw, 32px);
  max-width: 20em;
}
.page-about .about-board--ink .about-h2 {
  color: var(--paper);
}

.page-about .about-h3 {
  font-size: clamp(16px, 1.9vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--brown);
  margin: 0 0 10px;
}
.page-about .about-board--ink .about-h3 {
  color: var(--paper);
}

.page-about .about-p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--brown);
  margin: 0 0 1.15em;
  max-width: 62ch;
}
.page-about .about-p--sm {
  font-size: 15px;
  line-height: 1.75;
  margin-bottom: 0;
}
.page-about .about-board--ink .about-p {
  color: var(--veil);
}
.page-about .about-p--tail {
  margin-top: clamp(24px, 3vw, 36px);
  margin-bottom: 0;
}

/* ---------- 展板 01 阶段列表 ---------- */
.page-about .about-stages {
  list-style: none;
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}
.page-about .about-stage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: clamp(18px, 2.4vw, 26px) 0;
  border-bottom: 1px solid var(--rule);
}
@media (min-width: 760px) {
  .page-about .about-stage {
    grid-template-columns: 64px minmax(0, 1fr);
    gap: 0 clamp(18px, 3vw, 40px);
    align-items: start;
  }
}
.page-about .about-stage__no {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--copper);
  padding-top: 2px;
}
.page-about .about-stage__txt {
  min-width: 0;
}
.page-about .about-stage__txt .about-h3 {
  margin-bottom: 8px;
}

/* ---------- 展板 02 厂区 ---------- */
.page-about .about-frame {
  position: relative;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  overflow: hidden;
  background: var(--ink-2);
}
.page-about .about-frame img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-frame--lead img {
  aspect-ratio: 14 / 9;
}
.page-about .about-frame--photo img {
  aspect-ratio: 3 / 2;
}
.page-about .about-frame--square img {
  aspect-ratio: 1 / 1;
}
.page-about .about-frame__cap {
  display: block;
  padding: 10px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}
.page-about .about-board--ink .about-frame__cap {
  color: var(--veil-dim);
}

.page-about .about-works {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.4vw, 32px);
  margin-top: clamp(28px, 3.6vw, 46px);
}
@media (min-width: 820px) {
  .page-about .about-works {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 0 clamp(34px, 5vw, 76px);
  }
  .page-about .about-works::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 10px;
    bottom: 10px;
    width: 1px;
    background: var(--rule-dark);
    transform: skewX(-12deg);
  }
}
.page-about .about-works__col {
  min-width: 0;
}
.page-about .about-works__col .about-h3 {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--rule-dark);
  margin-bottom: 14px;
}
.page-about .about-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
}
.page-about .about-list li {
  position: relative;
  padding: 0 0 0 16px;
  margin-bottom: 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--veil);
}
.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 2px;
  background: var(--copper-soft);
}
.page-about .about-list strong {
  display: block;
  color: var(--paper);
  font-weight: 700;
  font-size: 14px;
}

.page-about .about-flow {
  margin-top: clamp(28px, 3.6vw, 44px);
  padding: clamp(18px, 2.4vw, 26px) clamp(18px, 2.6vw, 32px);
  background: var(--ink-2);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}
.page-about .about-flow__label {
  display: block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin: 0 0 10px;
}
.page-about .about-flow__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--veil);
  max-width: 62ch;
}

/* ---------- 展板 03 岗位 ---------- */
.page-about .about-roles {
  display: grid;
  gap: 1px;
  margin-top: clamp(24px, 3.2vw, 38px);
  background: var(--rule);
  border: 1px solid var(--rule);
}
.page-about .about-roles .drawer {
  background: var(--paper);
}
.page-about .about-roles .drawer__head {
  width: 100%;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 6px 16px;
  padding: clamp(14px, 2vw, 20px) clamp(14px, 2.2vw, 24px);
  background: var(--paper);
  border: 0;
  text-align: left;
  cursor: pointer;
  transition: background var(--dur) var(--ease);
}
.page-about .about-roles .drawer__head:hover {
  background: var(--paper-2);
}
.page-about .about-roles .drawer__title {
  font-size: clamp(16px, 1.9vw, 19px);
  font-weight: 700;
  color: var(--brown);
  letter-spacing: -0.01em;
}
.page-about .about-roles .drawer__meta {
  font-size: 13px;
  color: var(--copper-deep);
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
}
.page-about .about-roles .drawer__sign {
  grid-column: 2;
  grid-row: 1 / span 2;
  width: 22px;
  height: 22px;
  position: relative;
  align-self: center;
}
.page-about .about-roles .drawer__sign::before,
.page-about .about-roles .drawer__sign::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--copper);
  transform: translate(-50%, -50%);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.page-about .about-roles .drawer__sign::before {
  width: 14px;
  height: 2px;
}
.page-about .about-roles .drawer__sign::after {
  width: 2px;
  height: 14px;
}
.page-about .about-roles .drawer[data-open] .drawer__sign::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}
.page-about .about-roles .drawer__body {
  padding: 0 clamp(14px, 2.2vw, 24px) clamp(16px, 2.2vw, 22px);
  background: var(--paper);
}
.page-about .about-role__links {
  margin: 12px 0 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--gray);
}

.page-about .about-side {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
  margin-top: clamp(28px, 3.6vw, 46px);
  align-items: start;
}
@media (min-width: 800px) {
  .page-about .about-side {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(28px, 4vw, 56px);
  }
}
.page-about .about-side .about-frame {
  margin-top: 0;
}
.page-about .about-side__txt .about-p + .about-p {
  margin-top: 1em;
}

/* ---------- 展板 04 工艺 ---------- */
.page-about .about-craft {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 3.6vw, 52px);
  align-items: start;
}
@media (min-width: 880px) {
  .page-about .about-craft {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }
}
.page-about .about-craft__txt {
  min-width: 0;
}
.page-about .about-craft .about-frame {
  margin-top: 0;
  max-width: 420px;
}
.page-about .about-figures {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: clamp(16px, 2.4vw, 28px);
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: clamp(18px, 2.4vw, 26px) 0 0;
  border-top: 1px solid var(--rule);
}
.page-about .about-figures__num {
  display: block;
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 500;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--copper-deep);
}
.page-about .about-figures__cap {
  display: block;
  margin-top: 8px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 展板 05 合作流程 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: clamp(26px, 3.4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--rule-dark);
  border: 1px solid var(--rule-dark);
}
.page-about .about-step {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  padding: clamp(18px, 2.6vw, 28px) clamp(16px, 2.4vw, 28px);
  background: var(--ink);
}
@media (min-width: 820px) {
  .page-about .about-step {
    grid-template-columns: 56px minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 0 clamp(20px, 3vw, 44px);
    align-items: start;
  }
}
.page-about .about-step__no {
  display: block;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--copper-soft);
  padding-top: 3px;
}
.page-about .about-step__txt {
  min-width: 0;
}
.page-about .about-step__txt .about-h3 {
  margin-bottom: 8px;
}
.page-about .about-step__need {
  margin: 0;
  padding: 4px 0 4px 14px;
  border-left: 2px solid var(--cyan);
  font-size: 13px;
  line-height: 1.7;
  color: var(--veil-dim);
  align-self: start;
}

/* ---------- 展板 06 质量 ---------- */
.page-about .about-quality {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(26px, 3.4vw, 42px);
}
@media (min-width: 780px) {
  .page-about .about-quality {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
.page-about .about-quality__card {
  padding-top: 18px;
  border-top: 3px solid var(--copper);
}
.page-about .about-quality__no {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--copper-deep);
  margin: 0 0 12px;
}

.page-about .about-warranty {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: clamp(30px, 4vw, 48px);
  padding: clamp(20px, 2.8vw, 30px) clamp(18px, 2.6vw, 32px);
  background: var(--paper-2);
  border-left: 3px solid var(--copper);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}
@media (min-width: 720px) {
  .page-about .about-warranty {
    grid-template-columns: 80px minmax(0, 1fr);
    gap: 8px clamp(20px, 3vw, 40px);
    align-items: start;
  }
}
.page-about .about-warranty__label {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--copper-deep);
  margin: 4px 0 0;
}
.page-about .about-warranty__list {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px clamp(20px, 3vw, 40px);
  margin: 0;
  padding: 0;
  grid-column: 2;
}
.page-about .about-warranty__list li {
  font-size: 14px;
  line-height: 1.6;
  color: var(--brown);
}
.page-about .about-warranty__list .mono {
  font-size: 22px;
  font-weight: 500;
  color: var(--copper-deep);
  margin-right: 4px;
  letter-spacing: -0.02em;
}
.page-about .about-warranty__note {
  grid-column: 2;
  margin: 6px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--gray);
}
@media (max-width: 719px) {
  .page-about .about-warranty__label,
  .page-about .about-warranty__list,
  .page-about .about-warranty__note {
    grid-column: 1;
  }
}

.page-about .about-next {
  margin-top: clamp(30px, 4vw, 50px);
  padding-top: clamp(22px, 3vw, 32px);
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}
@media (min-width: 820px) {
  .page-about .about-next {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: clamp(24px, 4vw, 56px);
  }
}
.page-about .about-next__txt {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--brown);
  max-width: 48ch;
}
.page-about .about-next__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 0;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-roles .drawer__head,
  .page-about .about-roles .drawer__sign::before,
  .page-about .about-roles .drawer__sign::after,
  .page-about .about-link,
  .page-about .about-crumbs a {
    transition: none !important;
    transform: none !important;
  }
}