/* ============================================================
   页面：品牌沿革 /story/ · 作用域 .page-about
   ============================================================ */

.page-about {
  --about-hair: rgba(168, 176, 207, .2);
  --about-panel: rgba(14, 26, 60, .55);
  --about-rail-x: 22px;
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: 22px;
  padding-bottom: 2px;
  font-size: 13px;
  letter-spacing: .02em;
}

/* ---------- 首屏 ---------- */
.page-about .hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 4vw, 52px) 0 clamp(44px, 6vw, 82px);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .hero::before {
  content: "";
  position: absolute;
  top: -12%;
  left: -6%;
  right: -6%;
  height: 150%;
  background:
    radial-gradient(760px 420px at 84% 6%, rgba(91, 63, 168, .36), transparent 66%),
    radial-gradient(520px 320px at 6% 98%, rgba(53, 224, 208, .13), transparent 72%);
  pointer-events: none;
}

.page-about .hero__wrap {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 52px);
  align-items: center;
}

.page-about .hero h1 {
  margin: 12px 0 18px;
  max-width: 20ch;
}

.page-about .hero__text .lede {
  max-width: 46ch;
}

.page-about .hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(112px, 1fr));
  gap: 10px 12px;
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
}

.page-about .fact {
  padding: 10px 10px 10px 12px;
  border-left: 2px solid var(--purple);
  background: linear-gradient(90deg, rgba(91, 63, 168, .26), rgba(91, 63, 168, 0) 92%);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-about .fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(20px, 3.2vw, 28px);
  line-height: 1.1;
  color: var(--star);
  letter-spacing: -.02em;
}

.page-about .fact__label {
  display: block;
  margin-top: 3px;
  font-size: 13px;
  color: var(--slate);
}

.page-about .hero__figure {
  margin: 0;
  position: relative;
}

.page-about .hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--line-strong);
  box-shadow: var(--shadow-layer);
}

.page-about .hero__cap {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--slate);
}

/* ---------- 章节骨架 ---------- */
.page-about .section {
  padding: clamp(46px, 7vw, 86px) 0;
}

.page-about .sec-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 26px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .sec-num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 50px);
  font-weight: 700;
  line-height: 1;
  color: var(--purple);
  letter-spacing: -.04em;
}

.page-about .sec-head__text {
  min-width: 0;
}

.page-about .sec-head h2 {
  margin: 6px 0 0;
}

.page-about .prose {
  max-width: 40em;
}

.page-about .prose + .prose {
  margin-top: 14px;
}

/* ---------- 01 阅读提示卡 ---------- */
.page-about .start-card {
  padding: 20px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--pink);
  border-radius: 0 0 var(--r-md) var(--r-md);
  background: var(--about-panel);
}

.page-about .start-card__label {
  margin: 0 0 14px;
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--pink);
}

.page-about .start-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .start-card__list li {
  display: grid;
  gap: 3px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-hair);
}

.page-about .start-card__list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .start-card__k {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .start-card__v {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

/* ---------- 02 时间轴 ---------- */
.page-about .timeline__intro {
  margin-bottom: 34px;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: var(--about-rail-x);
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg,
    rgba(53, 224, 208, .7) 0%,
    rgba(91, 63, 168, .6) 42%,
    rgba(255, 123, 193, .4) 72%,
    rgba(168, 176, 207, .14) 100%);
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 18px 52px;
}

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

.page-about .tl-dot {
  position: absolute;
  left: 13px;
  top: 22px;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--purple);
  transition: border-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .tl-item.is-visible .tl-dot,
.page-about .tl-item:hover .tl-dot {
  border-color: var(--cyan);
  box-shadow: 0 0 0 6px rgba(53, 224, 208, .1), 0 0 16px rgba(53, 224, 208, .45);
}

.page-about .tl-card {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: linear-gradient(180deg, rgba(14, 26, 60, .74), rgba(14, 26, 60, .42));
  overflow: hidden;
  transition: border-color .25s var(--ease);
}

.page-about .tl-card[open],
.page-about .tl-card:hover {
  border-color: var(--line-strong);
}

.page-about .tl-summary {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 16px 48px 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-summary::after {
  content: "+";
  position: absolute;
  right: 18px;
  top: 15px;
  font-family: var(--font-mono);
  font-size: 19px;
  line-height: 1;
  color: var(--cyan);
  transition: transform .25s var(--ease);
}

.page-about .tl-card[open] .tl-summary::after {
  content: "\2013";
}

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

.page-about .tl-meta {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--pink);
}

.page-about .tl-title {
  margin: 0;
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--star);
}

.page-about .tl-body {
  margin: 0 18px 18px;
  padding-top: 14px;
  border-top: 1px dashed var(--about-hair);
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
}

/* ---------- 03 合作网络 ---------- */
.page-about .net-grid {
  align-items: start;
}

.page-about .net-figure {
  margin: 0;
}

.page-about .net-figure img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
  background: var(--deep-blue);
}

.page-about .net-figure__cap {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .tabs {
  margin-top: 26px;
}

.page-about .tabs__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .tabs__btn {
  flex: none;
  padding: 8px 18px;
  font: inherit;
  font-size: 14px;
  color: var(--slate);
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 999px;
  cursor: pointer;
  transition: color .2s var(--ease), background .2s var(--ease), border-color .2s var(--ease);
}

.page-about .tabs__btn:hover {
  color: var(--star);
  border-color: var(--cyan);
}

.page-about .tabs__btn[aria-selected="true"] {
  color: var(--void);
  background: var(--cyan);
  border-color: var(--cyan);
  font-weight: 600;
}

.page-about .tabs__btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .tabs__panel {
  margin-top: 16px;
  padding: 20px;
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  background: var(--about-panel);
}

.page-about .tabs__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--slate);
  max-width: 40em;
}

.page-about .org-card {
  margin-top: 22px;
  padding: 22px;
  border-radius: var(--r-md);
  color: var(--ink);
}

.page-about .org-card__label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: rgba(20, 22, 43, .6);
}

.page-about .org-card__text {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  max-width: 42em;
}

.page-about .org-card .btn {
  display: inline-block;
}

/* ---------- 04 供货节点图 ---------- */
.page-about .supply-map {
  margin-top: 34px;
  padding: 28px 4px 8px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background:
    linear-gradient(180deg, rgba(14, 26, 60, .7), rgba(7, 11, 26, .35));
}

.page-about .supply-map__nodes {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .sup-node {
  position: relative;
  padding-top: 30px;
  text-align: center;
  outline: none;
}

.page-about .sup-node__dot {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--deep-blue);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 14px rgba(53, 224, 208, .35);
}

.page-about .sup-node__name {
  display: block;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--star);
}

.page-about .sup-node__tip {
  display: inline-block;
  margin-top: 8px;
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  color: var(--ink);
  background: var(--paper);
  border-radius: var(--r-sm);
  white-space: normal;
}

.page-about .sup-node:focus-visible .sup-node__dot {
  border-color: var(--pink);
  box-shadow: 0 0 0 6px rgba(255, 123, 193, .18);
}

.page-about .supply-note {
  margin-top: 18px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
  max-width: 46em;
}

/* ---------- 05 团队与质量 ---------- */
.page-about .quality-grid {
  align-items: start;
}

.page-about .quality-card {
  padding: 24px;
  border-radius: var(--r-md);
  color: var(--ink);
}

.page-about .quality-card__lead {
  margin: 0 0 20px;
  font-family: var(--font-serif);
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .quality-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .quality-list li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding-top: 14px;
  border-top: 1px solid rgba(20, 22, 43, .14);
}

.page-about .quality-list li:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .q-num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  color: var(--purple);
}

.page-about .q-txt {
  font-size: 15px;
  line-height: 1.6;
  color: rgba(20, 22, 43, .82);
}

.page-about .quality-media {
  margin: 0;
}

.page-about .quality-media .media__frame {
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: var(--r-md);
  border: 1px solid var(--line);
}

.page-about .quality-media img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .quality-media .media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--slate);
}

/* ---------- 06 下一步 ---------- */
.page-about .next-section {
  border-top: 1px solid var(--about-hair);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .next-card {
  display: grid;
  gap: 8px;
  padding: 24px;
  border: 1px solid var(--line-strong);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(91, 63, 168, .28), rgba(14, 26, 60, .5) 68%);
  text-decoration: none;
  transition: border-color .25s var(--ease), transform .25s var(--ease);
}

.page-about .next-card:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .next-card:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .next-card__k {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--pink);
}

.page-about .next-card__t {
  font-family: var(--font-head);
  font-size: 22px;
  font-weight: 700;
  color: var(--star);
}

.page-about .next-card__d {
  font-size: 15px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .next-links {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .next-links a {
  display: inline-block;
  padding-bottom: 4px;
  font-size: 15px;
  color: var(--cyan);
  border-bottom: 1px solid rgba(53, 224, 208, .3);
  text-decoration: none;
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .next-links a:hover {
  border-color: var(--cyan);
}

.page-about .next-links a:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

/* ---------- 交互与动效 ---------- */
.page-about [data-reveal] {
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: .01ms !important;
    animation-duration: .01ms !important;
  }
}

/* ---------- 断点：桌面 ---------- */
@media (min-width: 760px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .supply-map {
    padding: 44px 24px 12px;
  }

  .page-about .supply-map__nodes {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .sup-node {
    padding-top: 34px;
  }

  .page-about .sup-node__name {
    font-size: 15px;
  }

  .page-about .sup-node::after {
    content: "";
    position: absolute;
    top: 9px;
    left: 50%;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, rgba(53, 224, 208, .5), rgba(91, 63, 168, .5));
    z-index: 0;
  }

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

  .page-about .sup-node__tip {
    position: absolute;
    left: 50%;
    top: -14px;
    transform: translate(-50%, 6px);
    margin: 0;
    padding: 6px 12px;
    opacity: 0;
    visibility: hidden;
    white-space: nowrap;
    pointer-events: none;
    z-index: 3;
    box-shadow: 0 10px 26px rgba(3, 6, 18, .5);
    transition: opacity .2s var(--ease), transform .2s var(--ease), visibility .2s linear;
  }

  .page-about .sup-node:hover .sup-node__tip,
  .page-about .sup-node:focus-visible .sup-node__tip,
  .page-about .sup-node:focus-within .sup-node__tip {
    opacity: 1;
    visibility: visible;
    transform: translate(-50%, 0);
  }
}

@media (min-width: 860px) {
  .page-about {
    --about-rail-x: 50%;
  }

  .page-about .timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .tl-item {
    width: 50%;
    padding: 0 58px 26px 0;
  }

  .page-about .tl-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 26px 58px;
  }

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

  .page-about .tl-dot {
    left: auto;
    right: -9px;
  }

  .page-about .tl-item:nth-child(even) .tl-dot {
    left: -9px;
    right: auto;
  }
}

@media (min-width: 960px) {
  .page-about .hero__wrap {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, .98fr);
  }

  .page-about .quality-list li {
    grid-template-columns: 78px minmax(0, 1fr);
  }
}