.page-about {
  --about-cat-drink: #1E3A5F;
  --about-cat-care: #2AF5D6;
  --about-cat-wear: #FF4D2E;
  --about-cat-food: #B3261E;
  --about-cat-home: #6E7378;
  --about-cat-tech: #0B1B2B;
  --about-mono: var(--font-mono);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  padding: 16px 0 4px;
}

/* ---------- 首屏刊头 ---------- */
.page-about .about-cover {
  position: relative;
  overflow: hidden;
  background: var(--deep);
  color: var(--chalk);
  padding: clamp(34px, 6vw, 78px) 0 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-cover__glow {
  position: absolute;
  inset: -30% -10% auto -10%;
  height: 78%;
  background:
    radial-gradient(46% 62% at 50% 0%, rgba(255, 77, 46, 0.3), transparent 68%),
    radial-gradient(30% 48% at 82% 12%, rgba(42, 245, 214, 0.14), transparent 70%);
  pointer-events: none;
}

.page-about .about-cover__inner {
  position: relative;
  z-index: 1;
  text-align: center;
}

.page-about .about-cover__title {
  margin: 16px 0 0;
  font-size: clamp(2rem, 5.6vw, 3.7rem);
  line-height: 0.98;
  letter-spacing: -0.035em;
  font-weight: 900;
  color: var(--chalk);
}

.page-about .about-cover__years {
  margin: 6px 0 0;
  font-family: var(--about-mono);
  font-size: clamp(2.9rem, 14vw, 9.5rem);
  line-height: 0.86;
  letter-spacing: -0.06em;
  font-weight: 700;
  color: rgba(255, 77, 46, 0.2);
  user-select: none;
}

.page-about .about-cover__lede {
  max-width: 62ch;
  margin: clamp(18px, 3vw, 30px) auto 0;
  font-size: clamp(1rem, 1.5vw, 1.12rem);
  line-height: 1.8;
  color: var(--on-dark);
}

.page-about .about-cover__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px 24px;
  margin-top: 26px;
  color: var(--on-dark-dim);
}

.page-about .about-cover__figure {
  position: relative;
  width: 100%;
  max-width: var(--wrap-wide);
  margin: clamp(30px, 5vw, 56px) auto 0;
  padding: 0 var(--gutter);
}

.page-about .about-cover__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
}

.page-about .about-cover__figure::after {
  content: "";
  position: absolute;
  inset: 0 var(--gutter);
  background: linear-gradient(180deg, rgba(11, 27, 43, 0.08), rgba(11, 27, 43, 0.72));
  pointer-events: none;
}

/* ---------- 目录 ---------- */
.page-about .about-toc {
  background: var(--paper);
  border-bottom: 1px solid var(--line);
}

.page-about .about-toc__inner {
  display: flex;
  align-items: center;
  gap: 16px;
  padding-top: 14px;
  padding-bottom: 14px;
}

.page-about .about-toc__tag {
  flex: none;
  color: var(--text-mid);
}

.page-about .about-toc__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 2px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-toc__link {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 13px;
  font-family: var(--about-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--text-mid);
  text-decoration: none;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--chalk);
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--flame);
  border-color: var(--flame);
}

.page-about .about-toc__link.is-active,
.page-about .about-toc__link[aria-current="true"] {
  color: var(--chalk);
  background: var(--deep);
  border-color: var(--deep);
}

/* ---------- 章节头 ---------- */
.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px 14px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .about-chapter__head h2 {
  margin: 0;
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  line-height: 1.02;
  letter-spacing: -0.025em;
  font-weight: 900;
}

.page-about .about-chapter__head::after {
  content: "";
  flex: 1 1 40px;
  min-width: 30px;
  height: 1px;
  background: var(--line);
}

.page-about .about-chapter__sub {
  flex: 1 1 100%;
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-mid);
}

.page-about .about-chapter__head--dark h2 {
  color: var(--chalk);
}

.page-about .about-chapter__head--dark::after {
  background: var(--line-dark);
}

.page-about .about-chapter__head--dark .about-chapter__sub {
  color: var(--on-dark-dim);
}

/* ---------- 01 使命 ---------- */
.page-about .about-mission {
  padding: clamp(44px, 7vw, 86px) 0;
}

.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

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

.page-about .about-quote {
  margin: 0 0 22px;
  padding-left: 18px;
  border-left: 3px solid var(--flame);
  font-size: clamp(1.35rem, 3vw, 1.95rem);
  line-height: 1.32;
  letter-spacing: -0.015em;
  font-weight: 900;
  color: var(--deep);
}

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

/* ---------- 02 时间轴 ---------- */
.page-about .about-timeline-band {
  background: var(--deep);
  color: var(--chalk);
  padding: clamp(46px, 7vw, 86px) 0 clamp(38px, 5vw, 62px);
  overflow: hidden;
}

.page-about .about-timeline {
  overflow-x: auto;
  overflow-y: hidden;
  padding: 0 var(--gutter) 20px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline__track {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
  min-width: max-content;
}

.page-about .about-season {
  flex: none;
  width: min(258px, 76vw);
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
}

.page-about .about-season:nth-child(3n + 2) {
  padding-top: 34px;
}

.page-about .about-season:nth-child(3n) {
  padding-top: 68px;
}

.page-about .about-season__year {
  margin: 0;
  font-family: var(--about-mono);
  font-size: 1.55rem;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--chalk);
}

.page-about .about-season--key .about-season__year {
  color: var(--flame);
}

.page-about .about-season__tick {
  position: relative;
  margin: 8px 0 16px;
  padding-bottom: 10px;
  font-family: var(--about-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--on-dark-dim);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-season__tick::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--concrete);
}

.page-about .about-season--key .about-season__tick::after {
  background: var(--flame);
  box-shadow: 0 0 0 3px rgba(255, 77, 46, 0.22);
}

.page-about .about-season__card {
  flex: 1;
  padding: 16px 16px 18px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  background: linear-gradient(158deg, rgba(30, 58, 95, 0.62), rgba(11, 27, 43, 0.12));
  transition: transform 0.28s ease, border-color 0.28s ease;
}

.page-about .about-season:hover .about-season__card,
.page-about .about-season:focus-within .about-season__card {
  transform: translateY(-4px);
  border-color: rgba(255, 77, 46, 0.55);
}

.page-about .about-season__card h3 {
  margin: 8px 0 8px;
  font-size: 0.95rem;
  line-height: 1.4;
  font-weight: 700;
  color: var(--chalk);
}

.page-about .about-season__card p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--on-dark);
}

.page-about .about-timeline__hint {
  display: block;
  margin: 6px 0 0;
  color: var(--on-dark-dim);
}

/* ---------- 03 关键转折 ---------- */
.page-about .about-turning {
  padding: clamp(44px, 7vw, 86px) 0;
}

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

.page-about .about-turning__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  padding: 22px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-turning__mark {
  display: flex;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-turning__num {
  font-family: var(--about-mono);
  font-size: 1.5rem;
  line-height: 1;
  font-weight: 700;
  color: var(--flame);
  letter-spacing: -0.02em;
}

.page-about .about-turning__year {
  font-family: var(--about-mono);
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--concrete);
}

.page-about .about-turning__body h3 {
  margin: 0 0 10px;
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  line-height: 1.3;
  letter-spacing: -0.015em;
  font-weight: 800;
  color: var(--deep);
}

.page-about .about-turning__body p {
  margin: 0;
  max-width: 72ch;
  font-size: 0.96rem;
  line-height: 1.85;
  color: var(--text-mid);
}

.page-about .about-turning__body a {
  color: var(--flame);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 04 六品类 ---------- */
.page-about .about-cats {
  padding: clamp(44px, 7vw, 86px) 0;
}

.page-about .about-cats__list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cat {
  --cat: var(--concrete);
  padding: 18px 18px 20px;
  border: 1px solid var(--line-dark);
  border-top: 3px solid var(--cat);
  border-radius: var(--radius);
  background: rgba(11, 27, 43, 0.34);
}

.page-about .about-cat--drink { --cat: var(--about-cat-drink); }
.page-about .about-cat--care { --cat: var(--about-cat-care); }
.page-about .about-cat--wear { --cat: var(--about-cat-wear); }
.page-about .about-cat--food { --cat: var(--about-cat-food); }
.page-about .about-cat--home { --cat: var(--about-cat-home); }
.page-about .about-cat--tech { --cat: var(--about-cat-tech); }

.page-about .about-cat .mono-label {
  color: var(--cat);
}

.page-about .about-cat__note {
  margin: 12px 0 0;
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--on-dark);
}

.page-about .about-cats__foot {
  max-width: 76ch;
  margin: clamp(22px, 3vw, 32px) 0 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--on-dark-dim);
}

.page-about .about-cats__foot a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 05 团队与方法 ---------- */
.page-about .about-method {
  padding: clamp(44px, 7vw, 86px) 0;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 clamp(28px, 4vw, 44px);
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  background: var(--paper);
  padding: 18px 16px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--about-mono);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  line-height: 1;
  letter-spacing: -0.03em;
  font-weight: 700;
  color: var(--flame);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 0.78rem;
  line-height: 1.5;
  letter-spacing: 0.02em;
  color: var(--text-mid);
}

.page-about .about-method__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

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

.page-about .about-method__lead {
  margin: 0 0 22px;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text);
}

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

.page-about .about-flow__step {
  display: grid;
  grid-template-columns: 42px 1fr;
  gap: 14px;
  padding: 18px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .about-flow__num {
  font-family: var(--about-mono);
  font-size: 0.95rem;
  line-height: 1.6;
  letter-spacing: 0.06em;
  color: var(--neon-ink);
}

.page-about .about-flow__step h3 {
  margin: 0 0 8px;
  font-size: 1rem;
  line-height: 1.4;
  font-weight: 800;
  color: var(--deep);
}

.page-about .about-flow__step p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-mid);
}

.page-about .about-method__note {
  margin: 22px 0 0;
  padding: 16px 18px;
  border-left: 3px solid var(--concrete);
  background: var(--chalk);
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--text-mid);
}

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

/* ---------- 尾部行动区 ---------- */
.page-about .about-cta {
  padding: clamp(34px, 5vw, 56px) 0;
}

.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  gap: 22px;
}

.page-about .about-cta__title {
  margin: 12px 0 0;
  max-width: 26ch;
  font-size: clamp(1.25rem, 2.8vw, 1.85rem);
  line-height: 1.3;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--chalk);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-mission__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: start;
  }

  .page-about .about-turning__item {
    grid-template-columns: 130px 1fr;
    gap: 28px;
    padding: 30px 0;
  }

  .page-about .about-turning__mark {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .about-method__grid {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: start;
  }

  .page-about .about-cta__inner {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 40px;
  }

  .page-about .about-cta__actions {
    flex: none;
  }
}

@media (min-width: 1100px) {
  .page-about .about-season {
    width: 268px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-season__card,
  .page-about .about-toc__link {
    transition: none;
  }

  .page-about .about-season:hover .about-season__card,
  .page-about .about-season:focus-within .about-season__card {
    transform: none;
  }
}