/* ================= 品牌总览 / about ================= */

.page-about {
  background: var(--almond);
  color: var(--board);
  overflow-x: clip;
}

.page-about .breadcrumb {
  padding-top: 20px;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(24px, 4vw, 48px) 0 clamp(36px, 6vw, 72px);
  border-bottom: var(--bd);
  overflow: hidden;
}

.page-about .ab-hero__grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(224, 213, 194, 0.9) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(224, 213, 194, 0.9) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 76%);
  mask-image: linear-gradient(180deg, #000 0%, transparent 76%);
  pointer-events: none;
}

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

.page-about .ab-hero__title {
  margin: 14px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.9rem, 6.2vw, 4rem);
  line-height: 1.12;
  letter-spacing: -0.005em;
  color: var(--board);
}

.page-about .ab-hero__lede {
  margin: 22px 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 2vw, 1.1875rem);
  line-height: 1.78;
  color: var(--ink);
}

.page-about .ab-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--bd);
}

.page-about .ab-hero__stats li {
  padding: 16px;
  border-right: var(--bd-thin);
}

.page-about .ab-hero__stats li:first-child {
  padding-left: 0;
}

.page-about .ab-hero__stats li:last-child {
  border-right: 0;
  padding-right: 0;
}

.page-about .ab-hero__num {
  display: block;
  font-family: var(--font-cond);
  font-size: clamp(1.75rem, 4.4vw, 2.75rem);
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--apricot);
}

.page-about .ab-hero__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-1);
  line-height: 1.5;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.page-about .ab-hero__media {
  margin: clamp(28px, 5vw, 48px) 0 0;
}

/* ---------- 通用章节 ---------- */

.page-about .ab-section {
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .ab-section--sand {
  background: var(--sand);
}

.page-about .ab-section--dark {
  background: var(--ink);
  color: var(--almond);
}

.page-about .section__head {
  margin-bottom: clamp(28px, 4vw, 48px);
  max-width: 68ch;
}

.page-about .ab-section--dark .section__title {
  color: var(--almond);
}

.page-about .ab-section--dark .section__sub {
  color: rgba(253, 246, 236, 0.72);
}

.page-about .ab-em {
  font-family: var(--font-mono);
  font-size: 1.3em;
  font-weight: 500;
  color: var(--apricot-deep);
  letter-spacing: -0.01em;
}

/* ---------- 01 年份时间轴 ---------- */

.page-about .ab-tl {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 56px);
}

.page-about .ab-axis {
  display: none;
}

.page-about .ab-nodes {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: clamp(26px, 4vw, 42px);
}

.page-about .ab-node {
  position: relative;
  padding: 18px 0 0;
  border-top: 3px solid var(--ink);
}

.page-about .ab-node::after {
  content: "";
  position: absolute;
  left: 0;
  top: -3px;
  width: 72px;
  height: 3px;
  background: var(--apricot);
}

.page-about .ab-node__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 18px;
}

.page-about .ab-node__year {
  font-family: var(--font-cond);
  font-size: clamp(1.75rem, 4.5vw, 2.625rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--apricot);
}

.page-about .ab-node__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.1875rem, 2.6vw, 1.5rem);
  line-height: 1.4;
  color: var(--ink);
}

.page-about .ab-node__text {
  margin: 14px 0 0;
  max-width: 58ch;
  line-height: 1.8;
  color: var(--ink-soft);
}

@media (min-width: 900px) {
  .page-about .ab-tl {
    grid-template-columns: 112px minmax(0, 1fr);
  }

  .page-about .ab-axis {
    display: block;
  }

  .page-about .ab-axis__list {
    position: sticky;
    top: 120px;
    margin: 0;
    padding: 0 0 0 24px;
    list-style: none;
    border-left: 1px solid var(--line);
  }

  .page-about .ab-axis__item {
    position: relative;
  }

  .page-about .ab-axis__item::before {
    content: "";
    position: absolute;
    left: -30px;
    top: 50%;
    width: 12px;
    height: 12px;
    margin-top: -6px;
    background: var(--almond);
    border: 2px solid var(--ink);
  }

  .page-about .ab-axis__item:has(.is-active)::before {
    background: var(--apricot);
    border-color: var(--apricot-deep);
  }

  .page-about .ab-axis__link {
    display: block;
    padding: 10px 0;
    font-family: var(--font-cond);
    font-size: 1.5rem;
    line-height: 1;
    letter-spacing: 0.05em;
    color: var(--gray);
    text-decoration: none;
    transition: color 0.18s ease;
  }

  .page-about .ab-axis__link:hover,
  .page-about .ab-axis__link:focus-visible,
  .page-about .ab-axis__link.is-active {
    color: var(--apricot-deep);
  }
}

/* ---------- 02 用户构成 ---------- */

.page-about .ab-audience {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.5vw, 24px);
}

.page-about .ab-aud {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(20px, 3vw, 28px);
  background: var(--almond);
  border: var(--bd);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-aud__tag {
  align-self: flex-start;
  padding: 4px 10px;
  font-size: var(--fs-1);
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--almond);
  background: var(--ink);
}

.page-about .ab-aud__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.125rem, 2.2vw, 1.375rem);
  line-height: 1.45;
  color: var(--ink);
}

.page-about .ab-aud__text {
  margin: 0;
  line-height: 1.8;
  color: var(--ink-soft);
}

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

/* ---------- 深色统计带 ---------- */

.page-about .ab-band {
  position: relative;
  overflow: hidden;
  padding: clamp(30px, 5vw, 56px) 0;
  background: var(--ink);
  border-top: 3px solid var(--apricot);
  border-bottom: 3px solid var(--apricot);
}

.page-about .ab-band::after {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(90deg,
      transparent 0 38px,
      rgba(242, 140, 40, 0.16) 38px 40px);
  pointer-events: none;
}

.page-about .ab-band__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: clamp(14px, 3vw, 36px);
}

.page-about .ab-band__num {
  margin: 0;
  font-family: var(--font-cond);
  font-size: clamp(3rem, 10vw, 5.5rem);
  line-height: 0.95;
  letter-spacing: 0.01em;
  color: var(--apricot);
}

.page-about .ab-band__label {
  margin: 0;
  max-width: 38ch;
  font-size: clamp(0.9375rem, 2vw, 1.125rem);
  line-height: 1.75;
  color: rgba(253, 246, 236, 0.82);
}

/* ---------- 03 工序 ---------- */

.page-about .ab-steps {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--bd);
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(20px, 3vw, 28px) 0;
  border-bottom: var(--bd-thin);
}

.page-about .ab-step__idx {
  font-family: var(--font-cond);
  font-size: clamp(1.375rem, 3.4vw, 2rem);
  line-height: 1;
  letter-spacing: 0.06em;
  color: var(--gray);
}

.page-about .ab-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.0625rem, 2.2vw, 1.3125rem);
  line-height: 1.45;
  color: var(--ink);
}

.page-about .ab-step__text {
  margin: 10px 0 0;
  max-width: 60ch;
  line-height: 1.8;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .page-about .ab-step {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 36px);
    align-items: start;
  }
}

/* ---------- 04 团队 ---------- */

.page-about .ab-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

.page-about .ab-team__chart {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
}

.page-about .ab-bar {
  display: grid;
  gap: 12px;
}

.page-about .ab-bar__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 16px;
}

.page-about .ab-bar__num {
  font-family: var(--font-cond);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--board);
}

.page-about .ab-bar__label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1rem, 2vw, 1.1875rem);
  color: var(--ink);
}

.page-about .ab-bar__track {
  position: relative;
  height: 16px;
  background: var(--almond);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .ab-bar__fill {
  display: block;
  height: 100%;
  width: var(--w, 100%);
  transform-origin: left center;
  animation: ab-bar-grow 0.8s cubic-bezier(0.22, 0.8, 0.24, 1) both;
}

.page-about .ab-bar__fill--w100 { --w: 100%; }
.page-about .ab-bar__fill--w35  { --w: 35%; }
.page-about .ab-bar__fill--w24  { --w: 24%; }

.page-about .ab-bar__fill--apricot { background: var(--apricot); }
.page-about .ab-bar__fill--ink { background: var(--ink); }
.page-about .ab-bar__fill--cyan { background: var(--cyan); }

.page-about .ab-bar:nth-child(2) .ab-bar__fill { animation-delay: 0.12s; }
.page-about .ab-bar:nth-child(3) .ab-bar__fill { animation-delay: 0.24s; }

.page-about .ab-bar__note {
  margin: 0;
  max-width: 56ch;
  font-size: var(--fs-2);
  line-height: 1.75;
  color: var(--gray);
}

.page-about .ab-team__media {
  margin: 0;
}

@keyframes ab-bar-grow {
  from { transform: scaleX(0); }
  to   { transform: scaleX(1); }
}

/* ---------- 05 合作 ---------- */

.page-about .ab-partners {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(170px, 1fr));
  gap: 1px;
  margin: 0 0 clamp(30px, 4vw, 46px);
  padding: 0;
  list-style: none;
  background: rgba(224, 213, 194, 0.3);
  border: 1px solid rgba(224, 213, 194, 0.3);
}

.page-about .ab-partners li {
  padding: clamp(18px, 3vw, 26px);
  background: var(--ink);
}

.page-about .ab-partners__num {
  display: block;
  font-family: var(--font-cond);
  font-size: clamp(2.25rem, 6vw, 3.25rem);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .ab-partners__label {
  display: block;
  margin-top: 10px;
  font-size: var(--fs-2);
  line-height: 1.6;
  color: rgba(253, 246, 236, 0.75);
}

.page-about .ab-coop {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 30px);
}

.page-about .ab-coop__item {
  padding-top: 16px;
  border-top: 3px solid var(--apricot);
}

.page-about .ab-coop__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.0625rem, 2.2vw, 1.25rem);
  line-height: 1.45;
  color: var(--almond);
}

.page-about .ab-coop__text {
  margin: 12px 0 0;
  line-height: 1.8;
  color: rgba(253, 246, 236, 0.72);
}

.page-about .ab-coop__cta {
  margin: clamp(28px, 4vw, 40px) 0 0;
}

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

/* ---------- 06 认可 ---------- */

.page-about .ab-honors {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--bd);
}

.page-about .ab-honors li {
  display: grid;
  grid-template-columns: 1fr;
  gap: 8px;
  padding: clamp(20px, 3vw, 28px) 0;
  border-bottom: var(--bd-thin);
}

.page-about .ab-honors__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.0625rem, 2.1vw, 1.1875rem);
  line-height: 1.45;
  color: var(--ink);
}

.page-about .ab-honors__text {
  margin: 0;
  max-width: 60ch;
  line-height: 1.8;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .page-about .ab-honors li {
    grid-template-columns: 260px minmax(0, 1fr);
    gap: 8px 32px;
  }
}

/* ---------- 收尾 ---------- */

.page-about .ab-closing {
  padding-bottom: clamp(44px, 6vw, 80px);
  border-top: var(--bd);
}

.page-about .ab-closing__media {
  margin: 0 0 clamp(32px, 5vw, 56px);
  box-shadow: none;
}

.page-about .ab-closing__inner {
  max-width: 68ch;
}

.page-about .ab-closing__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.25;
  color: var(--board);
}

.page-about .ab-closing__text {
  margin: 16px 0 0;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .ab-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 30px);
}

.page-about .ab-closing__aside {
  margin: 22px 0 0;
  font-size: var(--fs-2);
  line-height: 1.8;
  color: var(--gray);
}

.page-about .ab-closing__aside a {
  color: var(--apricot-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-closing__aside a:hover,
.page-about .ab-closing__aside a:focus-visible {
  color: var(--ink);
}

/* ---------- 窄屏微调 ---------- */

@media (max-width: 540px) {
  .page-about .ab-hero__stats {
    grid-template-columns: 1fr;
  }

  .page-about .ab-hero__stats li {
    padding: 14px 0;
    border-right: 0;
    border-bottom: var(--bd-thin);
  }

  .page-about .ab-hero__stats li:last-child {
    border-bottom: 0;
  }

  .page-about .ab-node__head {
    gap: 6px 14px;
  }
}

/* ---------- 动效降级 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-bar__fill {
    animation: none;
  }

  .page-about .ab-axis__link {
    transition: none;
  }
}