.page-about {
  background: var(--rice-50);
  color: var(--sauce-950);
  font-family: var(--font-body);
}

/* ---------- 首屏海报 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--sauce-800);
  color: var(--rice-50);
  padding: clamp(88px, 15vw, 152px) 0 clamp(40px, 6vw, 76px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(to right, rgba(251, 246, 236, .07) 0 1px, transparent 1px 96px);
  pointer-events: none;
}

.page-about .about-hero .yb-shell {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs {
  margin-bottom: clamp(24px, 4vw, 48px);
  color: rgba(251, 246, 236, .66);
}

.page-about .about-crumbs .yb-crumbs-link {
  color: rgba(251, 246, 236, .74);
  text-decoration: none;
}

.page-about .about-crumbs .yb-crumbs-link:hover {
  color: var(--pepper-300);
}

.page-about .about-crumb-current {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(28px, 5vw, 52px);
}

.page-about .about-eyebrow {
  color: var(--pepper-300);
  margin: 0;
}

.page-about .about-h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(32px, 7.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -.02em;
  margin: 14px 0 0;
}

.page-about .about-h1-em {
  font-style: normal;
  color: var(--pepper-300);
}

.page-about .about-lede {
  font-size: clamp(15px, 1.9vw, 18px);
  line-height: 1.9;
  color: rgba(251, 246, 236, .84);
  max-width: 46ch;
  margin: 22px 0 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-btn-ghost {
  color: var(--rice-50);
  border-color: rgba(251, 246, 236, .48);
}

.page-about .about-btn-ghost:hover {
  background: var(--rice-50);
  color: var(--sauce-950);
  border-color: var(--rice-50);
}

.page-about .about-hero-aside {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  border-top: 1px solid rgba(251, 246, 236, .26);
  padding-top: 18px;
}

.page-about .about-vertical {
  color: rgba(251, 246, 236, .58);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
}

.page-about .about-facts {
  margin: 0;
  display: grid;
  gap: 12px;
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .about-fact {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px dashed rgba(251, 246, 236, .2);
  padding-bottom: 8px;
}

.page-about .about-fact dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(251, 246, 236, .62);
}

.page-about .about-fact dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 700;
  color: var(--pepper-300);
  letter-spacing: -.02em;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index-bar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--rice-100);
  border-bottom: 1px solid var(--line-300);
}

.page-about .about-index {
  display: flex;
  gap: 4px;
  overflow-x: auto;
  padding: 10px 0;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

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

.page-about .about-index .yb-index-link {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--ink-500);
  text-decoration: none;
  padding: 8px 12px;
  border: 1px solid transparent;
  white-space: nowrap;
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-index .yb-index-link:hover {
  color: var(--sauce-600);
  border-color: var(--line-300);
}

.page-about .about-index .yb-index-link[aria-current="true"] {
  color: var(--sauce-950);
  background: var(--rice-50);
  border-color: var(--sauce-950);
}

/* ---------- 通用章节 ---------- */
.page-about .about-sec {
  padding-block: clamp(48px, 8vw, 96px);
}

.page-about .about-sec + .about-sec {
  border-top: 1px solid var(--line-300);
}

.page-about .about-sec--last {
  padding-bottom: clamp(56px, 9vw, 112px);
}

.page-about .about-sec-head {
  max-width: 60ch;
  margin-bottom: clamp(28px, 5vw, 48px);
}

.page-about .about-sec-head .yb-eyebrow {
  color: var(--sauce-600);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 42px);
  line-height: 1.14;
  letter-spacing: -.01em;
  margin: 12px 0 0;
}

.page-about .about-h2-light {
  color: var(--rice-50);
}

.page-about .about-sec-lede {
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-500);
  margin: 14px 0 0;
}

.page-about .about-h3 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.3vw, 23px);
  line-height: 1.3;
  letter-spacing: -.01em;
  margin: 0 0 10px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 22px;
  border-left: 1px solid var(--line-300);
}

.page-about .about-tl-item {
  position: relative;
  display: grid;
  gap: 10px;
  padding-bottom: clamp(30px, 5vw, 48px);
}

.page-about .about-tl-item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--pepper-500);
}

.page-about .about-tl-year {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
}

.page-about .about-tl-year span {
  font-size: clamp(24px, 4.4vw, 34px);
  font-weight: 700;
  color: var(--sauce-600);
  letter-spacing: -.02em;
  line-height: 1;
}

.page-about .about-tl-year em {
  font-style: normal;
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--ink-500);
}

.page-about .about-tl-body p {
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-500);
  margin: 0;
  max-width: 62ch;
}

.page-about .about-tl-body p a,
.page-about .about-details p a {
  color: var(--sauce-600);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-tl-body p a:hover,
.page-about .about-details p a:hover {
  color: var(--pepper-500);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 18px 0 0;
  max-width: 560px;
  border: 1px solid var(--line-300);
}

.page-about .about-figure .yb-figure-img,
.page-about .about-network-figure .yb-figure-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-figure--flavor {
  margin-top: 0;
  max-width: none;
}

/* ---------- 风味与方法 ---------- */
.page-about .about-flavor-grid {
  align-items: start;
}

.page-about .about-flavor-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-300);
}

.page-about .about-flavor {
  position: relative;
  padding: 20px 0 20px 40px;
  border-bottom: 1px solid var(--line-300);
}

.page-about .about-flavor-idx {
  position: absolute;
  left: 0;
  top: 22px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
  color: var(--pepper-500);
}

.page-about .about-flavor p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-500);
}

.page-about .about-method {
  margin-top: clamp(32px, 5vw, 56px);
}

.page-about .about-method-list {
  list-style: none;
  margin: 16px 0 0;
  padding: 1px;
  display: grid;
  gap: 1px;
  background: var(--line-300);
  border: 1px solid var(--line-300);
}

.page-about .about-method-list li {
  background: var(--rice-50);
  padding: 20px;
  display: grid;
  gap: 6px;
  align-content: start;
}

.page-about .about-method-num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--pepper-500);
}

.page-about .about-method-list strong {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
}

.page-about .about-method-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-500);
}

/* ---------- 合作网络 ---------- */
.page-about .about-network {
  position: relative;
  background: var(--sauce-950);
  color: var(--rice-50);
  padding-block: clamp(52px, 8vw, 100px);
  overflow: hidden;
}

.page-about .about-network-head {
  max-width: 58ch;
}

.page-about .about-eyebrow-light {
  color: var(--pepper-300);
  margin: 0;
}

.page-about .about-network-lede {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(251, 246, 236, .78);
  margin: 14px 0 0;
  max-width: 48ch;
}

.page-about .about-network-body {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(251, 246, 236, .18);
  border: 1px solid rgba(251, 246, 236, .18);
}

.page-about .about-stat {
  background: var(--sauce-950);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
}

.page-about .about-stat--xl,
.page-about .about-stat--wide {
  grid-column: span 2;
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-size: clamp(28px, 4.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--pepper-300);
}

.page-about .about-stat--xl .about-stat-num {
  font-size: clamp(46px, 8vw, 84px);
}

.page-about .about-stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(251, 246, 236, .66);
}

.page-about .about-network-figure {
  margin: 0;
  border: 1px solid rgba(251, 246, 236, .18);
}

.page-about .about-network-note {
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--pepper-500);
  color: rgba(251, 246, 236, .74);
  font-size: 15px;
  line-height: 1.85;
  max-width: 64ch;
}

/* ---------- 运营支持 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-300);
}

.page-about .about-step {
  display: grid;
  gap: 8px;
  padding: 22px 0;
  border-bottom: 1px solid var(--line-300);
}

.page-about .about-step .about-h3 {
  margin: 0;
}

.page-about .about-step-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--pepper-500);
}

.page-about .about-step p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-500);
  max-width: 60ch;
}

/* ---------- 品质与合规 ---------- */
.page-about .about-quality-grid {
  display: grid;
  gap: 1px;
  background: var(--line-300);
  border: 1px solid var(--line-300);
}

.page-about .about-q-card {
  background: var(--rice-100);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-q-card .about-h3 {
  margin: 10px 0 10px;
}

.page-about .about-q-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-500);
  max-width: 56ch;
}

.page-about .about-q-idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--sauce-600);
}

.page-about .about-q-card:first-child {
  background: var(--sauce-600);
  color: var(--rice-50);
}

.page-about .about-q-card:first-child .about-h3 {
  color: var(--rice-50);
}

.page-about .about-q-card:first-child p {
  color: rgba(251, 246, 236, .86);
}

.page-about .about-q-card:first-child .about-q-idx {
  color: var(--pepper-300);
}

/* ---------- 团队与文化 ---------- */
.page-about .about-team-grid {
  align-items: start;
}

.page-about .about-team-nums {
  display: grid;
  gap: 14px;
}

.page-about .about-team-item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  border-bottom: 1px solid var(--line-300);
  padding-bottom: 12px;
}

.page-about .about-team-num {
  font-family: var(--font-mono);
  font-size: clamp(36px, 6vw, 54px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--sauce-800);
}

.page-about .about-team-item span:last-child {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-500);
}

.page-about .about-team-text {
  margin: 20px 0 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--ink-500);
  max-width: 44ch;
}

.page-about .about-details {
  border-top: 1px solid var(--line-300);
}

.page-about .about-details details {
  border-bottom: 1px solid var(--line-300);
}

.page-about .about-details summary {
  position: relative;
  cursor: pointer;
  list-style: none;
  padding: 18px 34px 18px 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  line-height: 1.4;
  color: var(--sauce-950);
}

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

.page-about .about-details summary::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1;
  color: var(--pepper-500);
}

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

.page-about .about-details p {
  margin: 0 0 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-500);
  max-width: 62ch;
}

/* ---------- 结尾邀约 ---------- */
.page-about .about-cta {
  position: relative;
  background: var(--sauce-800);
  color: var(--rice-50);
  padding-block: clamp(48px, 7vw, 88px);
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--pepper-500);
}

.page-about .about-cta-inner {
  display: grid;
  gap: 24px;
}

.page-about .about-cta p {
  color: rgba(251, 246, 236, .82);
  font-size: 15.5px;
  line-height: 1.85;
  max-width: 48ch;
  margin: 14px 0 0;
}

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

/* ---------- 中等屏幕 ---------- */
@media (min-width: 700px) {
  .page-about .about-method-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-quality-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-q-card:first-child {
    grid-column: 1 / -1;
  }

  .page-about .about-step {
    grid-template-columns: 96px minmax(0, 220px) minmax(0, 1fr);
    align-items: baseline;
    gap: 0 24px;
    padding: 26px 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-index-bar {
    top: 64px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
    align-items: end;
  }

  .page-about .about-hero-aside {
    border-top: 0;
    border-left: 1px solid rgba(251, 246, 236, .26);
    padding-top: 0;
    padding-left: 20px;
  }

  .page-about .about-timeline {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-tl-item {
    grid-template-columns: 180px minmax(0, 1fr);
    gap: 0 clamp(28px, 4vw, 56px);
  }

  .page-about .about-tl-item::before {
    left: 176px;
    top: 14px;
  }

  .page-about .about-tl-year {
    flex-direction: column;
    align-items: flex-end;
    text-align: right;
    border-right: 1px solid var(--line-300);
    padding-right: clamp(16px, 2.4vw, 28px);
  }

  .page-about .about-network-body {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: center;
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
  }
}

/* ---------- 大屏收紧 ---------- */
@media (min-width: 1200px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stat--xl {
    grid-column: span 2;
    grid-row: span 2;
    justify-content: center;
  }

  .page-about .about-stat--wide {
    grid-column: span 1;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-index .yb-index-link,
  .page-about .about-btn-ghost {
    transition: none;
  }
}
<<<END>>>