.page-about {
  background: var(--cream);
  color: var(--body-ink);
  overflow-x: clip;
}

.page-about .crumb {
  padding-top: var(--sp-2);
  padding-bottom: var(--sp-1);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  background: var(--ink);
  color: var(--mist);
}

.page-about .about-hero__media {
  position: absolute;
  inset: 0;
  z-index: -1;
  overflow: hidden;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.34;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: -1;
  background: linear-gradient(180deg, rgba(14, 35, 55, 0.5) 0%, rgba(10, 12, 14, 0.9) 100%);
}

.page-about .about-hero__inner {
  padding-top: var(--sp-4);
  padding-bottom: var(--sp-4);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(28px, 6.4vw, 50px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: #fff;
  max-width: 20ch;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__meta {
  margin: 24px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--gold);
  padding-top: 14px;
  border-top: 1px solid var(--line-gold);
  display: inline-block;
}

.page-about .about-hero .kicker {
  color: var(--gold-glow);
}

/* ---------- 主体骨架 ---------- */

.page-about .about-main {
  background: var(--deep);
}

.page-about .about-main__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--sp-3);
  padding-top: var(--sp-4);
  padding-bottom: var(--sp-4);
}

/* ---------- 左侧时间轴 ---------- */

.page-about .about-rail {
  color: var(--mist);
  min-width: 0;
}

.page-about .about-rail > .kicker {
  color: var(--gold);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list > li {
  flex: 0 0 auto;
}

.page-about .about-node {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 10px 14px;
  border: 1px solid var(--line-soft);
  border-radius: 12px 4px 12px 4px;
  color: var(--mist);
  text-decoration: none;
  white-space: nowrap;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-node__year {
  font-size: 12.5px;
  letter-spacing: 0.08em;
  color: var(--gold);
}

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

.page-about .about-node:hover,
.page-about .about-node:focus-visible {
  color: #fff;
  border-color: var(--line-gold);
  background: rgba(200, 161, 90, 0.1);
}

.page-about .about-rail__foot {
  margin-top: var(--sp-3);
  padding-top: var(--sp-2);
  border-top: 1px solid var(--line-soft);
  max-width: 34ch;
}

.page-about .about-rail__foot .mono {
  margin: 0;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--gold-glow);
}

.page-about .about-rail__foot p:last-child {
  margin: 10px 0 0;
  font-size: 13.5px;
  line-height: 1.8;
  color: rgba(217, 222, 227, 0.78);
}

/* ---------- 右侧阅读区 ---------- */

.page-about .about-content {
  min-width: 0;
  display: grid;
  gap: var(--sp-4);
  background: var(--cream);
  color: var(--body-ink);
  border-radius: 16px 0 8px 0;
  padding: var(--sp-3) var(--sp-2);
}

.page-about .about-sec {
  scroll-margin-top: 120px;
  min-width: 0;
}

.page-about .about-sec > .kicker {
  color: var(--celadon);
}

.page-about .about-sec h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(23px, 4.6vw, 33px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--deep);
  max-width: 24ch;
}

.page-about .about-lede {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-sec > p:not(.kicker):not(.about-lede):not(.about-note) {
  margin: 14px 0 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
}

.page-about .about-note {
  margin: var(--sp-3) 0 0;
  max-width: 62ch;
  padding: 14px var(--sp-2);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--body-ink);
  background: rgba(110, 143, 130, 0.1);
  border-left: 2px solid var(--celadon);
  border-radius: 0 8px 8px 0;
}

/* ---------- 里程碑 ---------- */

.page-about .about-mile {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
}

.page-about .about-mile__item {
  position: relative;
  padding: 0 0 var(--sp-3) var(--sp-3);
  border-left: 1px solid rgba(14, 35, 55, 0.14);
  scroll-margin-top: 120px;
}

.page-about .about-mile__item:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-mile__item::before {
  content: "";
  position: absolute;
  left: -5.5px;
  top: 5px;
  width: 10px;
  height: 10px;
  background: var(--cream);
  border: 1px solid var(--gold);
  clip-path: polygon(0 0, 100% 0, 100% 64%, 64% 100%, 0 100%);
}

.page-about .about-mile__year {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--gold);
}

.page-about .about-mile__item h3 {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 19px;
  line-height: 1.4;
  color: var(--deep);
}

.page-about .about-mile__item p:last-child {
  margin: 8px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px var(--sp-2);
  padding: var(--sp-2);
  background: rgba(255, 255, 255, 0.52);
  border: 1px solid rgba(14, 35, 55, 0.1);
  border-radius: 12px 4px 12px 4px;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-team__row:hover,
.page-about .about-team__row:focus-within {
  border-color: var(--line-gold);
  background: rgba(200, 161, 90, 0.08);
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  color: var(--deep);
}

.page-about .about-team__num {
  margin: 0;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--clay);
  align-self: center;
}

.page-about .about-team__track {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  margin-top: 4px;
  background: rgba(14, 35, 55, 0.08);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: var(--gold);
}

.page-about .about-team__fill--edit {
  width: 58%;
}

.page-about .about-team__fill--gem {
  width: 19%;
  background: var(--celadon);
}

.page-about .about-team__fill--eng {
  width: 23%;
  background: var(--celadon);
}

.page-about .about-team__desc {
  grid-column: 1 / -1;
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 58ch;
}

/* ---------- 流程 ---------- */

.page-about .about-review__media {
  margin-top: var(--sp-3);
}

.page-about .about-review__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  border-radius: 16px 0 8px 0;
  border: 1px solid rgba(14, 35, 55, 0.08);
}

.page-about .about-flow {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-3);
}

.page-about .about-flow__step {
  position: relative;
  padding: var(--sp-3) var(--sp-2);
  background: rgba(255, 255, 255, 0.62);
  border: 1px solid rgba(14, 35, 55, 0.1);
  border-radius: 16px 0 8px 0;
}

.page-about .about-flow__no {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .about-flow__step h3 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 18px;
  color: var(--deep);
}

.page-about .about-flow__step p:last-child {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 走访 ---------- */

.page-about .about-figure {
  margin: var(--sp-3) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: 16px 0 8px 0;
  border: 1px solid rgba(14, 35, 55, 0.08);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 1px solid var(--line-gold);
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 编辑习惯 ---------- */

.page-about .about-principles {
  list-style: none;
  margin: var(--sp-3) 0 0;
  padding: 0;
  display: grid;
  gap: var(--sp-2);
}

.page-about .about-principle {
  padding: 14px var(--sp-2) 14px 18px;
  border-left: 1px solid var(--line-gold);
}

.page-about .about-principle h3 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 17px;
  color: var(--deep);
}

.page-about .about-principle p {
  margin: 8px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--stone);
  max-width: 56ch;
}

/* ---------- 下一步 ---------- */

.page-about .about-next {
  padding-top: var(--sp-3);
  border-top: 1px solid rgba(14, 35, 55, 0.12);
}

.page-about .about-next .kicker {
  color: var(--gold);
}

.page-about .about-next h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(21px, 4vw, 28px);
  line-height: 1.3;
  color: var(--deep);
}

.page-about .about-next p:not(.kicker) {
  margin: 12px 0 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-next__links {
  margin-top: var(--sp-3);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面布局 ---------- */

@media (min-width: 640px) {
  .page-about .header-progress,
  .page-about .about-hero__inner {
    padding-top: var(--sp-4);
  }

  .page-about .about-content {
    padding: var(--sp-3) var(--sp-3);
  }
}

@media (min-width: 900px) {
  .page-about .about-main__grid {
    grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
    gap: var(--sp-4);
    padding-top: var(--sp-5);
    padding-bottom: var(--sp-5);
  }

  .page-about .about-rail {
    position: sticky;
    top: 112px;
    align-self: start;
    padding-right: var(--sp-2);
  }

  .page-about .about-rail__list {
    display: block;
    overflow: visible;
    padding: 0 0 0 20px;
    position: relative;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 12px;
    bottom: 12px;
    width: 1px;
    background: var(--line-gold);
  }

  .page-about .about-node {
    display: grid;
    grid-template-columns: 54px minmax(0, 1fr);
    align-items: baseline;
    gap: 10px;
    padding: 12px 0;
    border: 0;
    border-radius: 0;
    white-space: normal;
    position: relative;
  }

  .page-about .about-node::before {
    content: "";
    position: absolute;
    left: -20px;
    top: 18px;
    width: 9px;
    height: 9px;
    background: var(--night);
    border: 1px solid var(--line-gold);
    clip-path: polygon(0 0, 100% 0, 100% 64%, 64% 100%, 0 100%);
    transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .page-about .about-node:hover,
  .page-about .about-node:focus-visible {
    background: transparent;
    color: var(--gold-glow);
  }

  .page-about .about-node:hover::before,
  .page-about .about-node:focus-visible::before {
    background: var(--gold);
    border-color: var(--gold);
  }

  .page-about .about-content {
    padding: var(--sp-4) var(--sp-4) var(--sp-5);
    gap: var(--sp-5);
  }

  .page-about .about-rail__foot {
    max-width: none;
  }
}

@media (min-width: 1024px) {
  .page-about .about-review__media {
    float: right;
    width: 34%;
    max-width: 300px;
    margin: 0 0 var(--sp-3) var(--sp-3);
  }

  .page-about .about-review__grid-clear {
    clear: both;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: var(--sp-2);
  }

  .page-about .about-flow__step:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .about-flow__step:nth-child(3) {
    margin-top: 44px;
  }

  .page-about .about-flow__step::after {
    content: "";
    position: absolute;
    left: 100%;
    top: 30%;
    width: 20px;
    height: 1px;
    background: var(--line-gold);
    transform: rotate(12deg);
    transform-origin: left center;
  }

  .page-about .about-flow__step:last-child::after {
    display: none;
  }

  .page-about .about-principles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: var(--sp-3) var(--sp-3);
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-node::before,
  .page-about .about-team__row {
    transition: none;
  }
}