.page-about {
  --about-paper-ink: #16241B;
  --about-paper-mute: rgba(8, 23, 15, .64);
  --about-rail-w: 170px;
  background: var(--mq-ink);
  color: var(--mq-white);
  overflow-x: hidden;
}

.page-about__crumbs {
  padding-top: clamp(18px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 56px) 0 clamp(56px, 8vw, 104px);
  background:
    radial-gradient(120% 96% at 86% 0%, rgba(184, 255, 61, .16), transparent 60%),
    radial-gradient(80% 70% at 0% 100%, rgba(255, 90, 43, .13), transparent 62%),
    linear-gradient(158deg, #08170F 0%, #10301F 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 3.4vw), 0 100%);
  margin-bottom: clamp(24px, 5vw, 56px);
}

.page-about .about-hero__inner {
  max-width: 1100px;
}

.page-about .about-hero__eyebrow {
  margin-bottom: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero__title {
  font-family: var(--mq-font-sans);
  font-weight: 300;
  font-size: clamp(40px, 8.6vw, 104px);
  line-height: 1.02;
  letter-spacing: -.02em;
  margin: 0 0 clamp(18px, 2.6vw, 30px);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  font-size: clamp(16px, 1.6vw, 19px);
  line-height: 1.78;
  color: rgba(242, 246, 242, .86);
  margin: 0 0 clamp(26px, 3.4vw, 40px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: clamp(34px, 5vw, 62px);
}

.page-about .about-hero__figs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 0;
  padding: clamp(20px, 3vw, 28px) 0 0;
  border-top: 1px solid var(--mq-hair-2);
  list-style: none;
}

.page-about .about-hero__fig {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__fig-num {
  font-family: var(--mq-font-display);
  font-weight: 700;
  font-size: clamp(42px, 6.4vw, 74px);
  line-height: .9;
  color: var(--mq-lime);
}

.page-about .about-hero__fig-cap {
  font-family: var(--mq-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mq-mute);
  text-transform: uppercase;
}

@media (min-width: 720px) {
  .page-about .about-hero__figs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 26px;
  }
}

/* ---------- 主体栅格 ---------- */

.page-about .about-shell {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(60px, 9vw, 130px);
}

.page-about .about-body {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: clamp(56px, 8vw, 108px);
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(34px, 5vw, 76px);
  }
}

/* ---------- 左侧年份索引 ---------- */

.page-about .about-rail {
  position: relative;
}

.page-about .about-rail__title {
  font-family: var(--mq-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mq-mute);
  margin: 0 0 12px;
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  list-style: none;
  margin: 0;
  padding: 0 0 10px;
  scrollbar-width: none;
}

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

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--mq-hair);
  border-radius: var(--mq-pill);
  color: var(--mq-white);
  text-decoration: none;
  white-space: nowrap;
  transition: border-color .22s var(--mq-ease), background-color .22s var(--mq-ease), color .22s var(--mq-ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--mq-lime);
  background: rgba(184, 255, 61, .1);
  color: var(--mq-lime);
}

.page-about .about-rail__no {
  font-family: var(--mq-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mq-lime);
}

.page-about .about-rail__label {
  font-size: 14px;
}

@media (min-width: 1040px) {
  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 4px;
    overflow: visible;
    border-left: 1px solid var(--mq-hair);
    padding: 4px 0 4px 14px;
  }

  .page-about .about-rail__link {
    border: 0;
    border-radius: 0;
    padding: 7px 0;
    background: none;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
  }
}

/* ---------- 章节 ---------- */

.page-about .about-sec {
  scroll-margin-top: 108px;
}

.page-about .about-sec__head {
  margin-bottom: clamp(24px, 3.6vw, 44px);
}

.page-about .about-sec__title {
  font-family: var(--mq-font-sans);
  font-weight: 300;
  font-size: clamp(28px, 4.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: 14px 0 16px;
  max-width: 24ch;
}

.page-about .about-sec__lede {
  max-width: 62ch;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.8;
  color: rgba(242, 246, 242, .8);
  margin: 0;
}

.page-about .about-prose {
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(242, 246, 242, .84);
  margin: 0 0 1.5em;
}

.page-about .about-prose:last-child {
  margin-bottom: 0;
}

/* 暖纸色章节 */
.page-about .about-sec--paper {
  position: relative;
  background: var(--mq-paper);
  color: var(--about-paper-ink);
  border-radius: var(--mq-radius-lg);
  padding: clamp(28px, 4.6vw, 60px) clamp(20px, 3.6vw, 52px);
  box-shadow: var(--mq-shadow);
  transition: box-shadow .28s var(--mq-ease);
}

.page-about .about-sec--paper::before {
  content: "";
  position: absolute;
  top: 0;
  left: clamp(20px, 3.6vw, 52px);
  width: 96px;
  height: 6px;
  background: linear-gradient(90deg, var(--mq-flag), var(--mq-lime));
  border-radius: 0 0 6px 6px;
}

.page-about .about-sec--paper:hover {
  box-shadow: 0 26px 60px rgba(0, 0, 0, .5);
}

.page-about .about-sec--paper .about-sec__title {
  color: var(--about-paper-ink);
}

.page-about .about-sec--paper .about-sec__lede,
.page-about .about-sec--paper .about-tl__text {
  color: var(--about-paper-mute);
}

.page-about .about-sec--paper .mq-eyebrow {
  color: var(--mq-flag);
}

.page-about .about-sec__no--dark {
  color: var(--mq-flag);
}

/* 深草绿章节 */
.page-about .about-sec--grass {
  background: var(--mq-grass);
  border-radius: var(--mq-radius-lg);
  padding: clamp(28px, 4.6vw, 60px) clamp(20px, 3.6vw, 52px);
  border: 1px solid var(--mq-hair);
}

/* ---------- 起点：图文分栏 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: clamp(30px, 4vw, 56px);
  }
}

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

/* ---------- 体量：条目清单 ---------- */

.page-about .about-ledger {
  list-style: none;
  margin: 0 0 clamp(24px, 3.4vw, 40px);
  padding: 0;
  border-top: 1px solid var(--mq-hair);
}

.page-about .about-ledger__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 20px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--mq-hair);
  transition: background-color .22s var(--mq-ease);
}

.page-about .about-ledger__row:hover {
  background: rgba(184, 255, 61, .06);
}

.page-about .about-ledger__key {
  font-family: var(--mq-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mq-mute);
  text-transform: uppercase;
}

.page-about .about-ledger__val {
  font-family: var(--mq-font-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1;
  color: var(--mq-lime);
}

/* ---------- 工序 ---------- */

.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  list-style: none;
  margin: 0 0 clamp(26px, 3.6vw, 44px);
  padding: 0;
}

@media (min-width: 760px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .about-step {
  position: relative;
  padding: 20px 18px 22px;
  border: 1px solid var(--mq-hair);
  border-radius: var(--mq-radius-md);
  background: rgba(16, 48, 31, .45);
  transition: border-color .24s var(--mq-ease), transform .24s var(--mq-ease);
}

.page-about .about-step:hover {
  border-color: var(--mq-lime);
  transform: translateY(-3px);
}

.page-about .about-step__no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--mq-flag);
  color: var(--mq-white);
  font-family: var(--mq-font-mono);
  font-size: 14px;
  margin-bottom: 14px;
}

.page-about .about-step__title {
  font-size: 19px;
  font-weight: 500;
  margin: 0 0 8px;
}

.page-about .about-step__text {
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 246, 242, .76);
  margin: 0;
}

.page-about .about-craft__media {
  margin: 0 0 clamp(26px, 3.6vw, 44px);
}

.page-about .about-team__lead {
  font-size: 16px;
  line-height: 1.75;
  margin: 0 0 18px;
  color: rgba(242, 246, 242, .86);
}

.page-about .about-bars {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-bar {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-bar__fill {
  display: block;
  height: 8px;
  border-radius: var(--mq-pill);
  min-width: 24px;
}

.page-about .about-bar__fill--a {
  background: var(--mq-lime);
}

.page-about .about-bar__fill--b {
  background: var(--mq-lime-soft);
}

.page-about .about-bar__fill--c {
  background: var(--mq-flag);
}

.page-about .about-bar__label {
  font-family: var(--mq-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mq-mute);
  text-transform: uppercase;
}

.page-about .about-bar__label b {
  font-family: var(--mq-font-display);
  font-size: 20px;
  color: var(--mq-white);
  margin-right: 4px;
}

.page-about .about-team__note {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mq-mute);
  margin: 0;
}

/* ---------- 四个赛季横卷 ---------- */

.page-about .about-tl {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(248px, 300px);
  gap: clamp(14px, 2vw, 22px);
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  overscroll-behavior-x: contain;
}

.page-about .about-tl__node {
  scroll-snap-align: start;
  border-top: 3px solid var(--about-paper-ink);
  padding: 18px 0 0;
}

.page-about .about-tl__year {
  font-family: var(--mq-font-display);
  font-weight: 700;
  font-size: clamp(38px, 5.4vw, 58px);
  line-height: .92;
  color: var(--about-paper-ink);
  margin: 0 0 10px;
}

.page-about .about-tl__title {
  font-size: 18px;
  font-weight: 500;
  margin: 0 0 8px;
  color: var(--about-paper-ink);
}

.page-about .about-tl__text {
  font-size: 15px;
  line-height: 1.72;
  margin: 0 0 14px;
}

.page-about .about-tl__more {
  border-top: 1px dashed var(--mq-paper-2);
  padding-top: 12px;
}

.page-about .about-tl__more summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--mq-font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--mq-flag);
  text-transform: uppercase;
}

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

.page-about .about-tl__more summary::after {
  content: " +";
}

.page-about .about-tl__more[open] summary::after {
  content: " −";
}

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

.page-about .about-tl__fields {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 7px;
}

.page-about .about-tl__fields li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-paper-mute);
}

.page-about .about-tl__fields li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--mq-lime);
}

.page-about .about-tl__aside {
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  max-width: 420px;
}

/* ---------- 内容五块 ---------- */

.page-about .about-blocks {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: clamp(22px, 3vw, 34px);
}

@media (min-width: 680px) {
  .page-about .about-blocks {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1120px) {
  .page-about .about-blocks {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-block:nth-child(1),
  .page-about .about-block:nth-child(2),
  .page-about .about-block:nth-child(3) {
    grid-column: span 2;
  }

  .page-about .about-block:nth-child(4) {
    grid-column: span 3;
  }

  .page-about .about-block:nth-child(5) {
    grid-column: span 3;
  }
}

.page-about .about-block {
  padding: 20px 18px 22px;
  border: 1px solid var(--mq-hair);
  border-radius: var(--mq-radius-md);
  background: rgba(8, 23, 15, .5);
  transition: border-color .24s var(--mq-ease), background-color .24s var(--mq-ease);
}

.page-about .about-block:hover {
  border-color: var(--mq-lime);
  background: rgba(184, 255, 61, .07);
}

.page-about .about-block__title {
  font-size: 17px;
  font-weight: 500;
  margin: 0 0 8px;
  color: var(--mq-lime);
}

.page-about .about-block__text {
  font-size: 14.5px;
  line-height: 1.74;
  color: rgba(242, 246, 242, .78);
  margin: 0;
}

.page-about .about-prose--lime {
  color: var(--mq-lime-soft);
  font-size: 15px;
}

.page-about .about-prose--lime a {
  color: var(--mq-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--mq-hair-2);
  transition: border-color .22s var(--mq-ease);
}

.page-about .about-prose--lime a:hover {
  border-color: var(--mq-lime);
}

/* ---------- 到手 ---------- */

.page-about .about-paths {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: clamp(26px, 3.6vw, 44px);
}

@media (min-width: 800px) {
  .page-about .about-paths {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

.page-about .about-path {
  padding: 24px 20px 26px;
  border-radius: var(--mq-radius-md);
  border: 1px solid var(--mq-hair);
  background: linear-gradient(150deg, rgba(16, 48, 31, .8), rgba(8, 23, 15, .6));
}

.page-about .about-path__tag {
  font-family: var(--mq-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mq-flag);
  margin: 0 0 12px;
}

.page-about .about-path__title {
  font-size: 20px;
  font-weight: 500;
  margin: 0 0 10px;
}

.page-about .about-path__text {
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 246, 242, .8);
  margin: 0;
}

.page-about .about-rhythm {
  border-top: 1px solid var(--mq-hair);
  padding-top: clamp(20px, 3vw, 32px);
  margin-bottom: clamp(24px, 3.4vw, 40px);
}

.page-about .about-rhythm__title {
  font-family: var(--mq-font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--mq-mute);
  margin: 0 0 18px;
}

.page-about .about-rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-rhythm__item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.page-about .about-rhythm__num {
  flex: 0 0 auto;
  min-width: 62px;
  font-family: var(--mq-font-display);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.05;
  color: var(--mq-lime);
}

.page-about .about-rhythm__text {
  font-size: 15px;
  line-height: 1.76;
  color: rgba(242, 246, 242, .8);
}

.page-about .about-outro {
  border-left: 3px solid var(--mq-flag);
  padding: 4px 0 4px 18px;
}

.page-about .about-outro__text {
  font-size: 15px;
  line-height: 1.78;
  color: rgba(242, 246, 242, .82);
  margin: 0;
}

.page-about .about-outro__link {
  color: var(--mq-lime);
  text-decoration: none;
  border-bottom: 1px solid var(--mq-hair-2);
  transition: border-color .22s var(--mq-ease);
}

.page-about .about-outro__link:hover {
  border-color: var(--mq-lime);
}

/* ---------- 图片 ---------- */

.page-about .mq-media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--mq-radius-md);
}

.page-about .about-split__media img {
  aspect-ratio: 16 / 10;
}

.page-about .about-craft__media img {
  aspect-ratio: 3 / 2;
}

.page-about .about-tl__aside img {
  aspect-ratio: 5 / 6;
}

.page-about .mq-media__cap {
  margin-top: 10px;
  font-family: var(--mq-font-mono);
  font-size: 12px;
  line-height: 1.6;
  letter-spacing: .04em;
  color: var(--mq-mute);
}

.page-about .about-sec--paper .mq-media__cap {
  color: var(--about-paper-mute);
}

/* ---------- 可见性增强 ---------- */

.page-about [data-reveal] {
  opacity: 1;
}

.page-about a:focus-visible,
.page-about summary:focus-visible {
  outline: 2px solid var(--mq-lime);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    animation: none !important;
  }
}