.page-about {
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .hero {
  position: relative;
  padding-block: clamp(24px, 4.6vw, 56px) clamp(30px, 5vw, 72px);
  background:
    radial-gradient(115% 85% at 88% -10%, rgba(63, 227, 198, 0.12), transparent 62%),
    radial-gradient(90% 80% at -10% 110%, rgba(243, 180, 68, 0.08), transparent 58%);
}

.page-about .hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 4vw, 46px);
  align-items: start;
}

.page-about .hero__copy {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: clamp(12px, 1.8vw, 18px);
}

.page-about .hero__copy > * {
  margin: 0;
}

.page-about .hero h1 {
  font-size: clamp(29px, 6.2vw, 70px);
  line-height: 1.06;
  letter-spacing: -0.022em;
  font-weight: 900;
  color: var(--text);
  max-width: 19ch;
}

.page-about .hero .lede {
  max-width: 58ch;
}

.page-about .hero__figs {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 26px;
}

.page-about .hero__figs li {
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .hero__num {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .hero__figs li:nth-child(2) .hero__num {
  color: var(--amber);
}

.page-about .hero__figs li:nth-child(3) .hero__num {
  color: var(--text);
}

.page-about .hero__unit {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--dim);
}

.page-about .hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

.page-about .hero__media {
  position: relative;
  margin: 0;
  aspect-ratio: 4 / 5;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.7) contrast(1.08) brightness(0.8);
}

/* ---------- 通用章节节奏 ---------- */
.page-about .story,
.page-about .awards,
.page-about .revision,
.page-about .archive,
.page-about .partners,
.page-about .roadmap {
  padding-block: clamp(40px, 6.6vw, 92px);
}

.page-about .story,
.page-about .revision {
  background: linear-gradient(180deg, rgba(16, 22, 20, 0.85), rgba(6, 17, 13, 0.2));
}

.page-about .section__head {
  margin-bottom: clamp(20px, 3.2vw, 36px);
}

.page-about .section__head h2 {
  margin-bottom: 10px;
}

/* ---------- 品牌叙事线 ---------- */
.page-about .story__banner {
  position: relative;
  margin: 0 0 clamp(26px, 4vw, 48px);
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .story__banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.68) contrast(1.05) brightness(0.76);
}

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 24px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--line) 34%, var(--line) 68%, var(--amber) 100%);
  opacity: 0.86;
}

.page-about .tl__row {
  position: relative;
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-block: 9px;
}

.page-about .tl__year {
  position: relative;
  z-index: 1;
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
}

.page-about .tl__card {
  border: 1px solid var(--line);
  background: var(--panel);
  padding: clamp(14px, 2vw, 20px) clamp(15px, 2.4vw, 24px);
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .tl__row:hover .tl__card,
.page-about .tl__row:focus-within .tl__card {
  border-color: rgba(63, 227, 198, 0.5);
  transform: translateY(-2px);
}

.page-about .tl__card h3 {
  margin: 0 0 8px;
  font-size: clamp(16.5px, 2.1vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.35;
  color: var(--text);
}

.page-about .tl__card p {
  margin: 0;
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.72;
  max-width: 60ch;
}

/* ---------- 奖项折叠面板 ---------- */
.page-about .awards__banner {
  position: relative;
  margin: 0 0 clamp(22px, 3.4vw, 38px);
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .awards__banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(0.6) contrast(1.08) brightness(0.8);
}

.page-about .awards__list {
  border-top: 1px solid var(--line);
  background: var(--panel);
}

.page-about .award {
  border-bottom: 1px solid var(--line);
  background: var(--panel);
  transition: background var(--dur) var(--ease);
}

.page-about .award[open] {
  background: linear-gradient(180deg, rgba(15, 58, 49, 0.92), rgba(16, 22, 20, 1) 88%);
}

.page-about .award__sum {
  position: relative;
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  padding: 15px 52px 15px 16px;
}

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

.page-about .award__sum::marker {
  content: "";
}

.page-about .award__sum::after {
  content: "+";
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .award[open] .award__sum::after {
  content: "—";
}

.page-about .award__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .award__name {
  font-size: clamp(16px, 2.2vw, 19px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .award__hint {
  display: none;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--dim);
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  padding: 3px 8px;
  white-space: nowrap;
}

.page-about .award__body {
  margin: 0 16px 16px;
  padding: 14px 0 0;
  border-top: 1px solid rgba(36, 65, 58, 0.75);
}

.page-about .award__body p {
  margin: 0;
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.75;
  max-width: 64ch;
}

/* ---------- 校订流程 ---------- */
.page-about .steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
  display: grid;
  gap: 14px;
}

.page-about .step {
  counter-increment: step;
  position: relative;
  border: 1px solid var(--line);
  border-left: 3px solid var(--panel-teal);
  background: var(--panel);
  padding: 18px 18px 18px 56px;
}

.page-about .step::before {
  content: "0" counter(step);
  position: absolute;
  left: 16px;
  top: 19px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .step h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .step p {
  margin: 0;
  color: var(--dim);
  font-size: 15.5px;
  line-height: 1.75;
  max-width: 62ch;
}

/* ---------- 档案室与团队 ---------- */
.page-about .archive__lead {
  max-width: 60ch;
  margin-bottom: clamp(24px, 4vw, 44px);
}

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

.page-about .fact {
  background: var(--panel);
  padding: clamp(16px, 2.6vw, 26px);
}

.page-about .fact__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(28px, 5vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .fact__num span {
  font-size: 0.4em;
  color: var(--dim);
  margin-left: 7px;
  letter-spacing: 0;
}

.page-about .fact__label {
  margin: 12px 0 8px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .fact__desc {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- 合作生态 ---------- */
.page-about .partners__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .partner {
  background: var(--panel);
  padding: clamp(18px, 2.6vw, 28px);
}

.page-about .partner__num {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: clamp(30px, 4.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--amber);
}

.page-about .partner h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .partner p {
  margin: 0;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.7;
}

/* ---------- 版本路线 ---------- */
.page-about .routemap {
  margin-top: clamp(20px, 3.2vw, 36px);
}

.page-about .routemap__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 14px;
}

.page-about .routemap__tabs label {
  display: inline-block;
  padding: 7px 14px;
  border: 1px solid var(--line);
  color: var(--dim);
  font-size: 13px;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .routemap__tabs label:hover {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about #rvf-all:checked ~ .routemap__tabs label[for="rvf-all"],
.page-about #rvf-spring:checked ~ .routemap__tabs label[for="rvf-spring"],
.page-about #rvf-autumn:checked ~ .routemap__tabs label[for="rvf-autumn"],
.page-about #rvf-extra:checked ~ .routemap__tabs label[for="rvf-extra"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .routemap input:focus-visible ~ .routemap__tabs label {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .routemap__scroll {
  overflow-x: auto;
  border: 1px solid var(--line);
  background: var(--panel);
  -webkit-overflow-scrolling: touch;
}

.page-about .vtable {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .vtable th {
  text-align: left;
  padding: 12px 16px;
  background: var(--panel-teal);
  color: var(--text);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  border-bottom: 1px solid var(--line);
  white-space: nowrap;
}

.page-about .vtable td {
  padding: 14px 16px;
  color: var(--dim);
  line-height: 1.65;
  vertical-align: top;
  border-bottom: 1px solid rgba(36, 65, 58, 0.7);
}

.page-about .vtable tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .vtable td:first-child {
  font-family: var(--font-mono);
  color: var(--amber);
  white-space: nowrap;
}

.page-about #rvf-spring:checked ~ .routemap__scroll .vtable tbody tr:not(.is-spring),
.page-about #rvf-autumn:checked ~ .routemap__scroll .vtable tbody tr:not(.is-autumn),
.page-about #rvf-extra:checked ~ .routemap__scroll .vtable tbody tr:not(.is-extra) {
  display: none;
}

.page-about .roadmap__note {
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  color: var(--dim);
  font-size: 15px;
  line-height: 1.78;
  max-width: 64ch;
}

.page-about .roadmap__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 227, 198, 0.4);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 601px) {
  .page-about .award__hint {
    display: inline-block;
  }
}

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

@media (min-width: 760px) {
  .page-about .partners__grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(30px, 4vw, 56px);
  }

  .page-about .hero__media {
    aspect-ratio: 4 / 5;
    max-height: 620px;
  }

  .page-about .tl__row {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 20px;
    padding-block: 11px;
  }

  .page-about .tl::before {
    left: 30px;
  }

  .page-about .steps {
    gap: 0;
  }

  .page-about .step:nth-child(1) {
    margin-right: 26%;
    border-left-color: var(--cyan);
  }

  .page-about .step:nth-child(2) {
    margin-right: 13%;
    margin-top: -1px;
  }

  .page-about .step:nth-child(3) {
    margin-top: -1px;
    border-left-color: var(--amber);
  }
}

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

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__card,
  .page-about .award,
  .page-about .routemap__tabs label {
    transition: none !important;
  }

  .page-about .tl__row:hover .tl__card,
  .page-about .tl__row:focus-within .tl__card {
    transform: none;
  }
}