/* ===== 品牌故事 · 纵向档案长卷 ===== */

.page-about {
  position: relative;
  display: block;
  background-color: var(--ink-900);
  background-image:
    radial-gradient(120% 55% at 10% 0%, rgba(201, 242, 78, .055), transparent 62%),
    radial-gradient(90% 45% at 92% 6%, rgba(240, 182, 90, .05), transparent 64%);
  color: var(--mist-200);
  font-family: var(--font-body);
  padding: calc(var(--header-h) + 26px) 0 0;
  overflow-x: hidden;
}

.page-about::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: clamp(420px, 72vh, 780px);
  background-image:
    linear-gradient(to right, var(--line-soft) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line-soft) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: .6;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 92%);
  pointer-events: none;
}

.page-about ::selection {
  background: var(--orange-500);
  color: var(--ink-900);
}

/* --- 页头与首屏 --- */

.page-about .about-head {
  position: relative;
  z-index: 2;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--text-faint);
  margin-bottom: clamp(28px, 5vw, 52px);
}

.page-about .about-crumbs a {
  color: var(--text-dim);
  text-decoration: none;
}

.page-about .about-crumbs a:hover,
.page-about .about-crumbs a:focus-visible {
  color: var(--lime-400);
}

.page-about .about-crumbs .is-current {
  color: var(--orange-500);
}

.page-about .about-hero {
  padding-bottom: clamp(36px, 7vw, 84px);
}

.page-about .about-kicker {
  display: inline-block;
  margin: 0 0 20px;
  padding-left: 12px;
  border-left: 2px solid var(--orange-500);
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .24em;
  color: var(--orange-500);
}

.page-about .about-title {
  margin: 0 0 22px;
  max-width: 16ch;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(32px, 8.4vw, 72px);
  line-height: 1.1;
  letter-spacing: -.02em;
  color: var(--paper-050);
}

.page-about .about-title em {
  font-style: normal;
  color: var(--orange-500);
}

.page-about .about-lede {
  margin: 0 0 clamp(32px, 6vw, 52px);
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-200);
}

.page-about .about-lede a {
  color: var(--lime-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 242, 78, .35);
}

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

.page-about .about-fact {
  padding: 18px 0;
  border-bottom: 1px solid var(--line-soft);
}

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

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(34px, 9vw, 56px);
  line-height: 1;
  letter-spacing: -.01em;
  color: var(--paper-050);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-dim);
}

/* --- 长卷容器 --- */

.page-about .about-timeline {
  position: relative;
  z-index: 2;
  max-width: var(--shell);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

.page-about .about-entry {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  padding: clamp(40px, 8vw, 72px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-entry:first-of-type {
  border-top-color: var(--line);
}

/* --- 左栏坐标轴 --- */

.page-about .about-entry__rail {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-entry__node {
  flex: none;
  width: 9px;
  height: 9px;
  background: var(--orange-500);
  box-shadow: 0 0 12px rgba(255, 106, 43, .55);
}

.page-about .about-entry__year {
  font-family: var(--font-num);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .22em;
  color: var(--text-faint);
  white-space: nowrap;
}

.page-about .about-entry.is-current .about-entry__node {
  background: var(--lime-400);
  box-shadow: 0 0 14px rgba(201, 242, 78, .6);
}

.page-about .about-entry.is-current .about-entry__year {
  color: var(--lime-400);
}

/* --- 章节主体 --- */

.page-about .about-entry__body {
  position: relative;
  min-width: 0;
}

.page-about .about-entry__num {
  position: absolute;
  top: -14px;
  right: 0;
  z-index: 0;
  font-family: var(--font-num);
  font-weight: 700;
  font-size: clamp(60px, 15vw, 132px);
  line-height: 1;
  letter-spacing: -.05em;
  color: var(--ink-800);
  pointer-events: none;
  -webkit-user-select: none;
  user-select: none;
}

.page-about .about-entry__title {
  position: relative;
  z-index: 1;
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(22px, 5vw, 36px);
  line-height: 1.28;
  letter-spacing: -.01em;
  color: var(--paper-050);
}

.page-about .about-entry.is-current .about-entry__title {
  color: #fff;
}

.page-about .about-entry__text {
  position: relative;
  z-index: 1;
  max-width: 64ch;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-200);
}

.page-about .about-entry__text p {
  margin: 0 0 18px;
}

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

.page-about .about-entry__text a {
  color: var(--lime-400);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 242, 78, .35);
}

.page-about .about-entry__text a:hover,
.page-about .about-entry__text a:focus-visible {
  border-bottom-color: var(--lime-400);
}

.page-about .about-mark {
  font-family: var(--font-num);
  font-weight: 700;
  color: var(--paper-050);
  border-bottom: 2px solid var(--lime-400);
  padding-bottom: 1px;
}

/* --- 团队分工 --- */

.page-about .about-team {
  margin: 28px 0 0;
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-team dt {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: .01em;
  color: var(--paper-050);
}

.page-about .about-team dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* --- 合作索引 --- */

.page-about .about-index {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  position: relative;
  z-index: 1;
  border-top: 1px solid var(--line);
}

.page-about .about-index__row {
  display: grid;
  grid-template-columns: 1fr auto;
  grid-template-areas:
    "key val"
    "note note";
  gap: 6px 16px;
  align-items: baseline;
  padding: 16px 0 16px 12px;
  border-bottom: 1px solid var(--line-soft);
  box-shadow: inset 0 0 0 0 var(--lime-400);
  transition: background-color .2s ease, box-shadow .2s ease;
}

.page-about .about-index__row:hover {
  background-color: rgba(201, 242, 78, .045);
  box-shadow: inset 2px 0 0 0 var(--lime-400);
}

.page-about .about-index__key {
  grid-area: key;
  font-family: var(--font-title);
  font-weight: 700;
  font-size: 15px;
  color: var(--paper-050);
}

.page-about .about-index__val {
  grid-area: val;
  font-family: var(--font-num);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--text-dim);
}

.page-about .about-index__val b {
  font-size: 26px;
  font-weight: 700;
  color: var(--lime-400);
  margin-right: 4px;
}

.page-about .about-index__note {
  grid-area: note;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* --- 配图 --- */

.page-about .about-figure {
  position: relative;
  z-index: 1;
  margin: 32px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: 1px solid var(--line);
  filter: saturate(.88) contrast(1.04);
}

.page-about .about-figure--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure figcaption {
  margin-top: 12px;
  font-size: 12px;
  line-height: 1.75;
  letter-spacing: .02em;
  color: var(--text-faint);
  max-width: 52ch;
}

/* --- 收尾 --- */

.page-about .about-cta {
  position: relative;
  z-index: 2;
  margin-top: clamp(40px, 8vw, 96px);
  background: var(--paper-050);
  color: var(--ink-900);
  padding: clamp(48px, 9vw, 104px) var(--gutter);
}

.page-about .about-cta__inner {
  max-width: var(--shell);
  margin: 0 auto;
}

.page-about .about-cta__title {
  margin: 0 0 18px;
  max-width: 22ch;
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(24px, 5.4vw, 40px);
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.page-about .about-cta__text {
  margin: 0 0 32px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: #3A4A46;
}

.page-about .about-cta__text a {
  color: var(--ink-900);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 2px solid var(--orange-500);
}

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

.page-about .about-cta .yb-btn {
  min-height: 44px;
  border-radius: var(--radius);
}

.page-about .about-cta .yb-btn--primary {
  background: var(--ink-900);
  border-color: var(--ink-900);
  color: var(--paper-050);
}

.page-about .about-cta .yb-btn--primary:hover,
.page-about .about-cta .yb-btn--primary:focus-visible {
  background: var(--orange-500);
  border-color: var(--orange-500);
  color: var(--ink-900);
}

.page-about .about-cta .yb-btn--ghost {
  background: transparent;
  border-color: rgba(11, 21, 18, .3);
  color: var(--ink-900);
}

.page-about .about-cta .yb-btn--ghost:hover,
.page-about .about-cta .yb-btn--ghost:focus-visible {
  border-color: var(--ink-900);
}

/* --- 入场显现 --- */

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity .6s ease, transform .6s ease;
}

.page-about [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

/* --- 平板 --- */

@media (min-width: 620px) {
  .page-about .about-facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-fact {
    padding: 22px 20px 22px 0;
    border-bottom: 1px solid var(--line);
    border-right: 1px solid var(--line-soft);
  }

  .page-about .about-fact:last-child {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .page-about .about-team__row {
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr);
    gap: 8px 28px;
    align-items: baseline;
  }

  .page-about .about-index__row {
    grid-template-columns: minmax(180px, 220px) minmax(0, 1fr) auto;
    grid-template-areas: "key note val";
    gap: 8px 28px;
    align-items: baseline;
  }
}

/* --- 桌面长卷栅格 --- */

@media (min-width: 900px) {
  .page-about {
    padding-top: calc(var(--header-h) + 44px);
  }

  .page-about .about-entry {
    grid-template-columns: 104px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 64px);
    padding: clamp(56px, 6.5vw, 104px) 0 clamp(64px, 7.5vw, 124px);
  }

  .page-about .about-entry__rail {
    flex-direction: column;
    align-items: center;
    gap: 18px;
    padding-top: 6px;
  }

  .page-about .about-entry__rail::before {
    content: "";
    position: absolute;
    left: 50%;
    top: 0;
    bottom: calc(-1 * clamp(64px, 7.5vw, 124px));
    width: 1px;
    background: var(--line);
    transform: translateX(-50%);
  }

  .page-about .about-entry:last-of-type .about-entry__rail::before {
    bottom: auto;
    height: 56px;
  }

  .page-about .about-entry__node {
    position: relative;
    z-index: 1;
  }

  .page-about .about-entry__year {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-size: 13px;
    letter-spacing: .32em;
  }

  .page-about .about-entry__num {
    top: -22px;
  }

  .page-about .about-entry__text {
    max-width: 60ch;
  }
}

@media (min-width: 1200px) {
  .page-about .about-entry {
    grid-template-columns: 116px minmax(0, 1fr);
  }

  .page-about .about-lede {
    font-size: 17px;
  }
}
<<<END>>>