/* ===== 品牌档案页专属样式 ===== */
.page-about {
  min-height: 100vh;
  padding-bottom: 72px;
  background:
    radial-gradient(ellipse at 92% 4%, rgba(255,42,77,.06), transparent 40%),
    repeating-linear-gradient(0deg, rgba(255,255,255,.012) 0, rgba(255,255,255,.012) 1px, transparent 1px, transparent 3px);
  font-family: var(--font-body);
}

/* 顶部引导 */
.page-about__intro {
  margin-bottom: 36px;
}
.page-about__intro-code {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-dim);
}

/* 章节头部 */
.page-about__section-head {
  margin-bottom: 40px;
}
.page-about__section-head .lead {
  margin-top: 16px;
}

/* ===== 品牌档案卡 ===== */
.page-about__card-section {
  margin-bottom: 72px;
}
.page-about__archive-card {
  position: relative;
  margin-left: 4px;
  padding: 24px 20px 28px 46px;
  background: var(--panel);
  border: 1px solid var(--line-strong);
  box-shadow: 10px 10px 0 rgba(0,0,0,.45);
}
.page-about__archive-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: linear-gradient(180deg, var(--red) 0%, var(--red-dark) 100%);
}
.page-about__archive-card::after {
  content: "";
  position: absolute;
  left: 17px;
  top: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--bg);
  box-shadow:
    0 36px 0 var(--bg),
    0 72px 0 var(--bg),
    0 108px 0 var(--bg),
    0 144px 0 var(--bg);
}
.page-about__archive-inner {
  position: relative;
}
.page-about__archive-head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 20px;
}
.page-about__archive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about__title {
  font-family: var(--font-head);
  font-size: clamp(28px, 6vw, 48px);
  line-height: 1.08;
  letter-spacing: .02em;
  margin: 0 0 6px;
}
.page-about__title-sub {
  display: block;
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: .42em;
  font-weight: 400;
  letter-spacing: .02em;
  color: var(--red);
}
.page-about__meta {
  display: grid;
  margin: 0;
  border-top: 1px solid var(--line);
}
.page-about__meta-row {
  display: grid;
  grid-template-columns: 108px 1fr;
  gap: 8px;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
}
.page-about__meta-row dt {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-dim);
}
.page-about__meta-row dd {
  margin: 0;
  font-size: 14px;
  color: var(--text);
}
.page-about__archive-note {
  margin-top: 18px;
  padding-left: 14px;
  border-left: 3px solid var(--gold);
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about__archive-photo {
  position: relative;
  width: 100%;
  max-width: 240px;
  margin: 0 auto;
}
.page-about__archive-photo img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line-strong);
  outline: 1px solid var(--red);
  outline-offset: 5px;
  filter: grayscale(1) contrast(1.18);
}
.page-about__photo-label {
  display: block;
  margin-top: 14px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--text-dim);
}
.page-about__flip-hint {
  display: none;
  margin-top: 20px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--text-dim);
}
.page-about__archive-back {
  margin-top: 24px;
  padding: 20px 18px;
  background: var(--red-dark);
  border: 1px solid var(--red);
}
.page-about__back-title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-size: 22px;
  letter-spacing: .03em;
  color: #fff;
}
.page-about__duty {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about__duty li {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid rgba(255,255,255,.14);
}
.page-about__duty li:last-child {
  border-bottom: 0;
}
.page-about__duty-group {
  font-family: var(--font-mono);
  font-size: 13px;
  color: #f0e0e0;
}
.page-about__duty-time {
  font-size: 13px;
  color: #fff;
  text-align: right;
}
.page-about__back-note {
  margin: 14px 0 0;
  font-size: 12px;
  color: rgba(255,255,255,.72);
}

/* ===== 成长时间轴 ===== */
.page-about__timeline-section {
  margin-bottom: 72px;
}
.page-about__timeline {
  display: grid;
  gap: 24px;
  position: relative;
  margin-top: 36px;
  padding-left: 34px;
}
.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--red) 0%, var(--purple) 70%, var(--gold) 100%);
}
.page-about__era {
  position: relative;
}
.page-about__era-node {
  position: absolute;
  left: -34px;
  top: 0;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--red);
  border-radius: 50%;
  background: var(--bg);
  color: var(--red);
  font-family: var(--font-mono);
  font-size: 11px;
  transition: transform .2s, background .2s, color .2s, border-color .2s;
}
.page-about__era-body {
  padding: 18px 18px 22px;
  background: var(--panel);
  border-left: 3px solid var(--red);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), 0 100%);
  transition: background .2s, border-color .2s;
}
.page-about__era-body h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 21px;
  letter-spacing: .02em;
}
.page-about__era-body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about__era:hover .page-about__era-node {
  background: var(--red);
  color: #fff;
  transform: scale(1.2);
}
.page-about__era:hover .page-about__era-body {
  background: #1a1515;
  border-left-color: var(--green);
}
.page-about__era:last-child .page-about__era-node {
  border-color: var(--green);
  color: var(--green);
}
.page-about__era:last-child .page-about__era-body {
  border-left-color: var(--green);
}
.page-about__era:last-child:hover .page-about__era-node {
  background: var(--green);
}
.page-about__era-figure {
  margin: 48px 0 0;
}
.page-about__era-figure figcaption,
.page-about__eco-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-dim);
}
.page-about__era-figure img,
.page-about__eco-figure img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 内容统筹手册 ===== */
.page-about__manual-section {
  margin-bottom: 80px;
}
.page-about__manual-grid {
  display: grid;
  gap: 24px;
}
.page-about__manual-block {
  padding: 24px 20px;
  background: var(--panel);
  border-top: 3px solid var(--gold);
}
.page-about__manual-block h3 {
  display: flex;
  align-items: baseline;
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-size: 20px;
}
.page-about__manual-num {
  margin-right: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--gold);
}
.page-about__taglist {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about__taglist li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
  font-size: 14px;
}
.page-about__taglist li:last-child {
  border-bottom: 0;
}
.page-about__tag-desc {
  color: var(--text-dim);
  font-size: 13px;
}
.page-about__code-demo {
  margin: 12px 0 18px;
  padding: 12px 16px;
  border: 1px dashed var(--line-strong);
  text-align: center;
  font-family: var(--font-mono);
  font-size: 28px;
  letter-spacing: .14em;
  color: var(--green);
}
.page-about__code-demo code {
  font-family: inherit;
}
.page-about__manual-block p {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-dim);
}
.page-about__manual-block p:last-child {
  margin-bottom: 0;
}
.page-about__manual-block a {
  color: var(--green);
}
.page-about__manual-foot {
  margin-top: 28px;
  padding: 16px 18px;
  border-left: 3px solid var(--green);
  background: rgba(0,255,159,.05);
  font-size: 14px;
}
.page-about__manual-foot p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.7;
}

/* ===== 值班与审核 ===== */
.page-about__duty-section {
  margin-bottom: 80px;
  color: #f0e0e0;
}
.page-about__duty-section .page-about__section-head .section-title {
  color: #fff;
}
.page-about__duty-section .page-about__section-head .lead {
  color: rgba(255,255,255,.82);
}
.page-about__duty-grid {
  display: grid;
  gap: 24px;
  margin-top: 32px;
}
.page-about__duty-card h3 {
  margin: 0 0 16px;
  font-family: var(--font-head);
  font-size: 20px;
  color: var(--red);
}
.page-about__factlist {
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about__factlist li {
  position: relative;
  padding: 10px 0 10px 24px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  font-size: 14px;
  line-height: 1.6;
}
.page-about__factlist li::before {
  content: "▸";
  position: absolute;
  left: 2px;
  color: var(--green);
}
.page-about__review-list {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: review;
}
.page-about__review-list li {
  position: relative;
  counter-increment: review;
  padding: 10px 0 10px 40px;
  border-bottom: 1px solid rgba(255,255,255,.08);
  font-size: 14px;
  line-height: 1.6;
}
.page-about__review-list li::before {
  content: counter(review);
  position: absolute;
  left: 0;
  top: 11px;
  width: 24px;
  height: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--red);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--red);
}
.page-about__review-list li span {
  margin-right: 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--red);
}
.page-about__duty-note {
  margin: 14px 0 0;
  font-size: 13px;
  color: rgba(255,255,255,.72);
}
.page-about__duty-footer {
  margin-top: 28px;
  padding: 14px 16px;
  border-left: 3px solid var(--red);
  background: rgba(255,255,255,.04);
  font-size: 14px;
}
.page-about__duty-footer p {
  margin: 0;
}
.page-about__duty-footer a {
  color: var(--green);
}

/* ===== 协作生态 ===== */
.page-about__ecosystem-section {
  margin-bottom: 0;
}
.page-about__partners {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 18px;
  margin-bottom: 32px;
}
.page-about__partner-stamp {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 20px 12px;
  background: var(--panel);
  border: 1px dashed var(--line-strong);
  text-align: center;
  transition: transform .2s, border-color .2s, background .2s;
}
.page-about__partner-stamp:hover {
  transform: translateY(-4px);
  border-color: var(--purple);
  background: #16131e;
}
.page-about__stamp-circle {
  width: 74px;
  height: 74px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 3px solid var(--red);
  border-radius: 50%;
  box-shadow: inset 0 0 0 3px var(--bg);
  font-family: var(--font-head);
  font-size: 18px;
  color: var(--red);
  transform: rotate(-8deg);
  transition: transform .2s, color .2s, border-color .2s;
}
.page-about__partner-stamp:hover .page-about__stamp-circle {
  transform: rotate(0deg) scale(1.06);
  border-color: var(--purple);
  color: #c9a0ff;
}
.page-about__partner-stamp > p {
  margin: 0;
  font-family: var(--font-head);
  font-size: 15px;
}
.page-about__eco-extra {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin-bottom: 40px;
  padding: 18px 20px;
  background: #16131e;
  border: 1px solid var(--line-strong);
  font-size: 14px;
}
.page-about__eco-extra p {
  margin: 0;
  color: var(--text-dim);
  line-height: 1.7;
}
.page-about__award {
  display: inline-block;
  margin-right: 4px;
  padding: 4px 10px;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  transform: rotate(-2deg);
}
.page-about__eco-figure {
  margin: 0;
}
.page-about__eco-figure .img-frame {
  transition: transform .35s ease;
}
.page-about__eco-figure .img-frame:hover {
  transform: scale(1.015);
}
.page-about__privacy-note {
  margin-top: 40px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--text-dim);
}
.page-about__privacy-note p {
  margin: 0;
}
.page-about__privacy-note a {
  color: var(--green);
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about__archive-card {
    padding: 32px 32px 32px 60px;
  }
  .page-about__archive-card::after {
    left: 23px;
    top: 32px;
  }
  .page-about__archive-grid {
    grid-template-columns: 1fr 220px;
    gap: 36px;
  }
  .page-about__archive-photo {
    max-width: none;
  }
  .page-about__flip-hint {
    display: block;
  }
  .page-about__archive-inner {
    transform-style: preserve-3d;
    transition: transform .6s cubic-bezier(.4,0,.2,1);
  }
  .page-about__archive-card:hover .page-about__archive-inner,
  .page-about__archive-card:focus-within .page-about__archive-inner {
    transform: rotateY(180deg);
  }
  .page-about__archive-front,
  .page-about__archive-back {
    backface-visibility: hidden;
  }
  .page-about__archive-back {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
    margin-top: 0;
    padding: 32px 28px;
    transform: rotateY(180deg);
    overflow: auto;
  }

  .page-about__timeline {
    grid-template-columns: 1fr 1fr;
    gap: 0 32px;
    padding-left: 0;
  }
  .page-about__timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about__era {
    margin-bottom: 40px;
  }
  .page-about__era:nth-child(odd) {
    justify-self: end;
    padding-right: 32px;
    text-align: right;
  }
  .page-about__era:nth-child(even) {
    justify-self: start;
    padding-left: 32px;
    text-align: left;
  }
  .page-about__era:nth-child(odd) .page-about__era-node {
    left: auto;
    right: auto;
    left: calc(100% + 2px);
  }
  .page-about__era:nth-child(even) .page-about__era-node {
    left: -30px;
  }
  .page-about__era:nth-child(odd) .page-about__era-body {
    border-left: 0;
    border-right: 3px solid var(--red);
  }
  .page-about__era:nth-child(odd):hover .page-about__era-body {
    border-right-color: var(--green);
  }
  .page-about__era:last-child .page-about__era-body {
    border-left-color: var(--green);
  }
  .page-about__era:last-child:nth-child(odd) .page-about__era-body {
    border-left: 0;
    border-right-color: var(--green);
  }

  .page-about__manual-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 32px;
  }
  .page-about__duty-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
  .page-about__partners {
    grid-template-columns: repeat(4, 1fr);
    gap: 24px;
  }
  .page-about__era-figure,
  .page-about__eco-figure {
    max-width: 860px;
    margin-left: auto;
    margin-right: auto;
  }
  .page-about__privacy-note {
    display: flex;
    justify-content: space-between;
  }
}