.page-about {
  background: var(--ink);
  color: var(--white);
  font-family: var(--font-body);
  line-height: 1.75;
  padding-bottom: 76px;
  overflow-x: clip;
}

.page-about .shell {
  width: 100%;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding: 12px 0 0;
}

.page-about .about-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--haze);
}

.page-about .about-crumb__item {
  display: inline-flex;
  align-items: center;
}

.page-about .about-crumb__item + .about-crumb__item::before {
  content: "/";
  margin-right: 6px;
  color: var(--line);
}

.page-about .about-crumb__link {
  color: var(--haze);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crumb__link:hover,
.page-about .about-crumb__link:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-crumb__item[aria-current="page"] {
  color: var(--cyan-mist);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 24px 0 44px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.6vw, 62px);
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--white);
}

.page-about .about-hero .eyebrow {
  color: var(--cyan);
}

.page-about .about-hero .lede {
  max-width: 62ch;
  font-size: 16px;
  color: rgba(255, 255, 255, 0.78);
}

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

.page-about .about-hero__panel {
  position: relative;
  padding: 22px 22px 24px;
  border: 1px solid var(--line);
  background:
    linear-gradient(155deg, rgba(47, 227, 200, 0.09), rgba(47, 227, 200, 0) 58%),
    var(--ink-2);
  box-shadow: 0 1px 0 rgba(255, 255, 255, 0.03) inset, 0 18px 34px -28px rgba(0, 0, 0, 0.9);
}

.page-about .about-hero__panel::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(47, 227, 200, 0));
}

.page-about .about-hero__panel-label {
  margin: 0 0 16px;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--haze);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding-left: 12px;
  border-left: 1px solid var(--line-soft);
}

.page-about .about-hero__fact-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  line-height: 1.1;
  color: var(--amber);
}

.page-about .about-hero__fact-label {
  font-size: 13px;
  color: var(--haze);
}

/* ---------- 通用章节 ---------- */
.page-about .about-section {
  padding: 46px 0 0;
}

.page-about .about-section__head {
  max-width: 68ch;
  margin-bottom: 26px;
}

.page-about .about-section__head .eyebrow {
  color: var(--rust-soft);
}

.page-about .about-section__title {
  margin: 10px 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(25px, 4.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.008em;
  color: var(--white);
}

.page-about .about-section__note {
  margin: 0;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- 时间轴 ---------- */
.page-about .about-epoch__figure {
  margin: 0 0 34px;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}

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

.page-about .about-epoch__list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-epoch__item {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: 26px 0 24px;
  border-top: 1px solid var(--line-soft);
}

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

.page-about .about-epoch__year {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(54px, 15vw, 108px);
  line-height: 0.86;
  letter-spacing: -0.035em;
  color: transparent;
  -webkit-text-stroke: 1px rgba(47, 227, 200, 0.55);
  text-shadow: none;
}

.page-about .about-epoch__body {
  max-width: 68ch;
}

.page-about .about-epoch__heading {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-epoch__body p {
  margin: 0;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .about-epoch__more {
  margin-top: 14px;
  border-top: 1px dashed var(--line-soft);
}

.page-about .about-epoch__more summary {
  display: inline-flex;
  align-items: center;
  min-height: 44px;
  padding-right: 22px;
  position: relative;
  cursor: pointer;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  list-style: none;
}

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

.page-about .about-epoch__more summary::after {
  content: "+";
  position: absolute;
  right: 0;
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--dur) var(--ease);
}

.page-about .about-epoch__more[open] summary::after {
  transform: rotate(45deg);
}

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

.page-about .about-epoch__more p {
  margin: 4px 0 4px;
  padding: 12px 0 14px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.68);
}

/* ---------- 柜组 ---------- */
.page-about .about-cabinets__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: start;
}

.page-about .about-cabinets__text p {
  margin: 0 0 16px;
  font-size: 15px;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-cabinets__points {
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-cabinets__points li {
  position: relative;
  padding: 12px 14px 12px 30px;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
  font-size: 14px;
  color: rgba(255, 255, 255, 0.74);
}

.page-about .about-cabinets__points li::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 19px;
  width: 7px;
  height: 7px;
  background: var(--rust);
  box-shadow: 0 0 0 3px rgba(217, 85, 47, 0.16);
}

.page-about .about-cabinets__points strong {
  color: var(--amber-soft);
  font-weight: 600;
}

.page-about .about-cabinets__cta {
  margin: 0;
}

.page-about .about-cabinets__figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}

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

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
  align-items: start;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line-soft);
  background:
    radial-gradient(circle at 82% 12%, rgba(232, 179, 60, 0.1), transparent 62%),
    var(--ink-2);
}

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

.page-about .about-team__rows {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "num name"
    "num desc";
  gap: 2px 14px;
  padding: 16px 16px;
  background: var(--ink);
  transition: background var(--dur) var(--ease);
}

.page-about .about-team__row:hover,
.page-about .about-team__row:focus-within {
  background: var(--ink-2);
}

.page-about .about-team__row-num {
  grid-area: num;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.1;
  color: var(--amber);
  align-self: start;
  padding-top: 2px;
}

.page-about .about-team__row-name {
  grid-area: name;
  font-size: 15px;
  font-weight: 600;
  color: var(--white);
}

.page-about .about-team__row-desc {
  grid-area: desc;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.66);
  max-width: 62ch;
}

/* ---------- 节奏（奶油纸区） ---------- */
.page-about .about-rhythm__panel {
  padding: 30px 20px 26px;
}

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

.page-about .about-rhythm__panel .about-section__note {
  color: rgba(42, 33, 27, 0.72);
}

.page-about .about-rhythm__panel .eyebrow {
  color: var(--rust);
}

.page-about .about-rhythm__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-rhythm__card {
  padding: 18px 16px 20px;
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(42, 33, 27, 0.14);
  border-top: 3px solid var(--rust);
}

.page-about .about-rhythm__card:nth-child(2) {
  border-top-color: var(--amber);
}

.page-about .about-rhythm__card:nth-child(3) {
  border-top-color: var(--ink-3);
}

.page-about .about-rhythm__card:nth-child(4) {
  border-top-color: var(--haze);
}

.page-about .about-rhythm__cycle {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.01em;
  color: var(--paper-ink);
}

.page-about .about-rhythm__heading {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--paper-ink);
}

.page-about .about-rhythm__card p:last-child {
  margin: 0;
  font-size: 14px;
  color: rgba(42, 33, 27, 0.78);
}

.page-about .about-rhythm__cta {
  margin: 24px 0 0;
}

/* ---------- 覆盖情况（纯 CSS 切换） ---------- */
.page-about .about-reach__switch {
  position: relative;
}

.page-about .about-reach__radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  border: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

.page-about .about-reach__tabs {
  display: inline-flex;
  gap: 0;
  padding: 3px;
  margin-bottom: 20px;
  border: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-reach__tab {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 20px;
  cursor: pointer;
  font-size: 14px;
  color: var(--haze);
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease);
  user-select: none;
}

.page-about .about-reach__tab:hover {
  color: var(--cyan-mist);
}

.page-about #reach-view-region:checked ~ .about-reach__tabs label[for="reach-view-region"],
.page-about #reach-view-device:checked ~ .about-reach__tabs label[for="reach-view-device"] {
  background: var(--cyan);
  color: var(--ink);
}

.page-about #reach-view-region:focus-visible ~ .about-reach__tabs label[for="reach-view-region"],
.page-about #reach-view-device:focus-visible ~ .about-reach__tabs label[for="reach-view-device"] {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-reach__panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-reach__panel {
  padding: 24px 20px 22px;
  border: 1px solid var(--line-soft);
  background:
    linear-gradient(200deg, rgba(47, 227, 200, 0.07), rgba(47, 227, 200, 0) 55%),
    var(--ink-2);
}

.page-about .about-reach__panel--device {
  background:
    linear-gradient(200deg, rgba(232, 179, 60, 0.09), rgba(232, 179, 60, 0) 55%),
    var(--ink-2);
}

.page-about #reach-view-region:checked ~ .about-reach__panels .about-reach__panel--device,
.page-about #reach-view-device:checked ~ .about-reach__panels .about-reach__panel--region {
  display: none;
}

.page-about .about-reach__big {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(44px, 11vw, 78px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--amber);
}

.page-about .about-reach__big-label {
  margin: 6px 0 16px;
  font-size: 15px;
  color: var(--white);
}

.page-about .about-reach__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  border-top: 1px solid var(--line-soft);
  padding-top: 16px;
}

.page-about .about-reach__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  color: rgba(255, 255, 255, 0.7);
}

.page-about .about-reach__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 联系之前 ---------- */
.page-about .about-before__panel {
  padding: 30px 20px 26px;
}

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

.page-about .about-before__panel .about-section__note {
  color: rgba(42, 33, 27, 0.72);
}

.page-about .about-before__panel .eyebrow {
  color: var(--rust);
}

.page-about .about-before__list {
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 18px;
}

.page-about .about-before__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding-bottom: 18px;
  border-bottom: 1px solid rgba(42, 33, 27, 0.12);
}

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

.page-about .about-before__index {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  line-height: 1.3;
  color: var(--rust);
}

.page-about .about-before__heading {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 17px;
  color: var(--paper-ink);
}

.page-about .about-before__body p {
  margin: 0;
  font-size: 14px;
  color: rgba(42, 33, 27, 0.78);
  max-width: 64ch;
}

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

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-section {
    padding-top: 58px;
  }

  .page-about .about-rhythm__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-reach__panels {
    grid-template-columns: 1fr;
  }

  .page-about .about-rhythm__panel,
  .page-about .about-before__panel {
    padding: 38px 32px 34px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.7fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-hero__panel {
    margin-top: 16px;
  }

  .page-about .about-cabinets__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: 40px;
  }

  .page-about .about-reach__panels {
    grid-template-columns: minmax(0, 1fr);
  }

  /* 时间轴：年份列 + 轨道 + 正文 */
  .page-about .about-epoch__item {
    grid-template-columns: minmax(0, 212px) minmax(0, 1fr);
    column-gap: 60px;
    align-items: start;
    padding: 36px 0 32px;
  }

  .page-about .about-epoch__year {
    font-size: clamp(76px, 9.4vw, 132px);
    text-align: right;
    padding-right: 4px;
  }

  .page-about .about-epoch__item::after {
    content: "";
    position: absolute;
    top: 0;
    bottom: 0;
    left: calc(212px + 30px);
    width: 1px;
    background: linear-gradient(180deg, var(--line-soft), rgba(47, 227, 200, 0.6) 20%, rgba(47, 227, 200, 0.6) 80%, var(--line-soft));
  }

  .page-about .about-epoch__item::before {
    content: "";
    position: absolute;
    top: 44px;
    left: calc(212px + 23px);
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background: var(--ink);
    border: 2px solid var(--cyan);
    box-shadow: 0 0 0 5px rgba(47, 227, 200, 0.12);
  }

  .page-about .about-epoch__heading {
    font-size: 21px;
  }
}

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

  .page-about .about-reach__panels {
    grid-template-columns: minmax(0, 1fr);
    max-width: 780px;
  }

  .page-about .about-team__row {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 4px 20px;
    padding: 20px 22px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-crumb__link,
  .page-about .about-epoch__more summary::after,
  .page-about .about-reach__tab,
  .page-about .about-team__row {
    transition: none;
  }
}
</main>