/* =========================================================
   品牌自述 /about-us/ —— page-about
   ========================================================= */

.page-about {
  --about-rail: 104px;
  background: var(--ob-night);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ob-night);
  padding: calc(var(--ob-header-h) + clamp(30px, 6vw, 72px)) 0 clamp(46px, 8vw, 96px);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

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

.page-about .about-hero__veil {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(118deg, var(--ob-night) 2%, rgba(10, 23, 48, 0.92) 44%, rgba(16, 34, 74, 0.4) 100%);
}

.page-about .about-hero__diag {
  position: absolute;
  top: 0;
  bottom: 0;
  right: -8%;
  width: 58%;
  z-index: 2;
  background: linear-gradient(158deg, rgba(242, 169, 59, 0.22), rgba(242, 169, 59, 0) 62%);
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 3;
  display: grid;
  gap: clamp(26px, 4vw, 44px);
}

.page-about .about-crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-family: var(--ob-font-mono);
  letter-spacing: 0.02em;
  color: var(--ob-slate);
}

.page-about .about-crumbs a {
  color: var(--ob-slate);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ob-ease), border-color 0.2s var(--ob-ease);
}

.page-about .about-crumbs a:hover {
  color: var(--ob-gold);
  border-bottom-color: var(--ob-gold);
}

.page-about .about-crumbs__meta {
  margin-left: auto;
  color: rgba(242, 169, 59, 0.85);
}

.page-about .about-kicker {
  color: var(--ob-gold);
  letter-spacing: 0.14em;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--ob-font-display);
  font-weight: 900;
  font-size: clamp(34px, 7.4vw, 64px);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--ob-paper);
  max-width: 15ch;
}

.page-about .about-hero__sub {
  margin: 20px 0 0;
  max-width: 44ch;
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.8;
  color: #C9D4E6;
}

.page-about .about-hero__acts {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__panel {
  padding: 22px 20px 24px;
  border-radius: 16px;
}

.page-about .about-panel__title {
  margin: 0 0 16px;
  color: var(--ob-yellow);
  letter-spacing: 0.14em;
}

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

.page-about .about-facts li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--ob-hairline-light);
  font-size: 14px;
  color: #DCE4F0;
}

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

.page-about .about-facts b {
  font-family: var(--ob-font-mono);
  font-weight: 700;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--ob-gold);
}

.page-about .about-panel__foot {
  margin: 18px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--ob-slate);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-sec {
  position: relative;
  padding: clamp(50px, 7vw, 96px) 0;
}

.page-about .about-sec--paper {
  background: var(--ob-paper);
  color: var(--ob-ink);
}

.page-about .about-sec--night {
  background: var(--ob-night-2);
  color: var(--ob-paper);
}

.page-about .about-chapter {
  display: grid;
  gap: 10px;
}

.page-about .about-chapter__num {
  font-family: var(--ob-font-mono);
  font-weight: 700;
  font-size: clamp(38px, 6vw, 72px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: rgba(31, 27, 22, 0.16);
}

.page-about .about-chapter--night .about-chapter__num {
  color: rgba(245, 238, 225, 0.2);
}

.page-about .about-chapter__body h2 {
  margin: 0;
  font-family: var(--ob-font-display);
  font-weight: 900;
  font-size: clamp(23px, 3.4vw, 38px);
  line-height: 1.22;
  letter-spacing: -0.005em;
  color: var(--ob-ink);
  max-width: 22ch;
}

.page-about .about-chapter--night .about-chapter__body h2 {
  color: var(--ob-paper);
}

.page-about .about-chapter__body p {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.82;
  color: var(--ob-muted);
}

.page-about .about-chapter--night .about-chapter__body p {
  color: #B9C4D6;
}

/* ---------- 01 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0 0 0 22px;
  position: relative;
  border-left: 2px dashed rgba(31, 27, 22, 0.22);
  display: grid;
  gap: 28px;
}

.page-about .about-stage {
  position: relative;
}

.page-about .about-stage__dot {
  position: absolute;
  left: -31px;
  top: 5px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  box-sizing: border-box;
  background: var(--ob-paper);
  border: 3px solid var(--ob-gold);
}

.page-about .about-stage__era {
  margin: 0;
  font-family: var(--ob-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ob-muted);
}

.page-about .about-stage__title {
  margin: 8px 0 0;
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ob-ink);
}

.page-about .about-stage__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ob-muted);
}

.page-about .about-stage__more {
  margin-top: 12px;
  padding-top: 10px;
  border-top: 1px solid var(--ob-hairline);
}

.page-about .about-stage__more summary {
  list-style: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-family: var(--ob-font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ob-blue);
}

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

.page-about .about-stage__more summary::after {
  content: "+";
  font-size: 14px;
  line-height: 1;
}

.page-about .about-stage__more[open] summary::after {
  content: "–";
}

.page-about .about-stage__more p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ob-ink);
}

/* ---------- 02 职能线 ---------- */
.page-about .about-duties {
  list-style: none;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-duty {
  position: relative;
  padding: 22px 20px;
  border-radius: 14px;
  background: var(--ob-glass);
  border: 1px solid var(--ob-glass-line);
  transition: transform 0.26s var(--ob-ease), border-color 0.26s var(--ob-ease),
    background 0.26s var(--ob-ease);
}

.page-about .about-duty--a { border-top: 3px solid var(--ob-blue); }
.page-about .about-duty--b { border-top: 3px solid var(--ob-gold); }
.page-about .about-duty--c { border-top: 3px solid var(--ob-green); }

.page-about .about-duty:hover,
.page-about .about-duty:focus {
  outline: none;
  transform: translateY(-4px);
  border-color: rgba(242, 169, 59, 0.55);
  background: rgba(245, 238, 225, 0.16);
}

.page-about .about-duty__idx {
  margin: 0;
  font-family: var(--ob-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ob-slate);
}

.page-about .about-duty h3 {
  margin: 10px 0 0;
  font-size: 19px;
  font-weight: 900;
  color: var(--ob-paper);
}

.page-about .about-duty__line {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: #C3CDDE;
}

.page-about .about-duty__more {
  margin: 0;
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 14px;
  line-height: 1.78;
  color: #A9B6CC;
  transition: max-height 0.3s var(--ob-ease), opacity 0.3s var(--ob-ease),
    margin-top 0.3s var(--ob-ease);
}

.page-about .about-duty:hover .about-duty__more,
.page-about .about-duty:focus .about-duty__more,
.page-about .about-duty:focus-within .about-duty__more {
  max-height: 260px;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 03 条目路径 ---------- */
.page-about .about-path__grid {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  gap: clamp(28px, 4vw, 46px);
}

.page-about .about-steps {
  list-style: none;
  counter-reset: step;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-steps li {
  position: relative;
  padding-left: 52px;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ob-muted);
}

.page-about .about-steps li strong {
  display: block;
  margin-bottom: 3px;
  font-size: 16px;
  font-weight: 900;
  color: var(--ob-ink);
}

.page-about .about-steps li::before {
  counter-increment: step;
  content: counter(step, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 1px;
  width: 36px;
  height: 36px;
  display: grid;
  place-items: center;
  border-radius: 10px;
  background: var(--ob-night);
  color: var(--ob-gold);
  font-family: var(--ob-font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

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

.page-about .about-fig {
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--ob-hairline);
  background: var(--ob-paper-2);
}

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

.page-about .about-figcap {
  margin: 12px 0 0;
  font-family: var(--ob-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.01em;
  line-height: 1.7;
  color: var(--ob-muted);
}

/* ---------- 04 更新节奏 ---------- */
.page-about .about-cadence {
  overflow: hidden;
}

.page-about .about-cadence__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.page-about .about-cadence__bg img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.32;
}

.page-about .about-cadence__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ob-night) 0%, rgba(10, 23, 48, 0.7) 48%, var(--ob-night) 100%);
}

.page-about .about-cadence .ob-container {
  position: relative;
  z-index: 1;
}

.page-about .about-cycles {
  list-style: none;
  margin: clamp(28px, 4vw, 42px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-cycle {
  padding: 20px 20px 22px;
  border-radius: 14px;
  background: rgba(245, 238, 225, 0.08);
  border: 1px solid var(--ob-glass-line);
  border-left: 3px solid var(--ob-gold);
}

.page-about .about-cycle--red { border-left-color: var(--ob-red); }
.page-about .about-cycle--blue { border-left-color: var(--ob-blue); }

.page-about .about-cycle__k {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ob-yellow);
}

.page-about .about-cycle h3 {
  margin: 10px 0 0;
  font-size: 19px;
  font-weight: 900;
  color: var(--ob-paper);
}

.page-about .about-cycle p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #B9C4D6;
}

/* ---------- 05 快人一步 ---------- */
.page-about .about-pace__grid {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  gap: 18px;
}

.page-about .about-pace__item {
  padding: 26px 22px 28px;
  border-radius: 16px;
  background: var(--ob-paper-2);
  border: 1px solid var(--ob-hairline);
  border-top: 4px solid var(--ob-blue);
}

.page-about .about-pace__item--gold {
  border-top-color: var(--ob-gold);
}

.page-about .about-pace__tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ob-muted);
}

.page-about .about-pace__item h3 {
  margin: 10px 0 0;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ob-ink);
}

.page-about .about-pace__item p {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--ob-muted);
}

/* ---------- 06 下一步 ---------- */
.page-about .about-next__grid {
  margin-top: clamp(28px, 4vw, 46px);
  display: grid;
  gap: 16px;
}

.page-about .about-route {
  display: block;
  padding: 24px 20px;
  border-radius: 14px;
  text-decoration: none;
  background: var(--ob-glass);
  border: 1px solid var(--ob-glass-line);
  transition: transform 0.26s var(--ob-ease), border-color 0.26s var(--ob-ease),
    background 0.26s var(--ob-ease);
}

.page-about .about-route:hover,
.page-about .about-route:focus-visible {
  transform: translateY(-4px);
  border-color: var(--ob-gold);
  background: rgba(245, 238, 225, 0.16);
  outline: none;
}

.page-about .about-route__k {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ob-yellow);
}

.page-about .about-route h3 {
  margin: 12px 0 0;
  font-size: 19px;
  font-weight: 900;
  color: var(--ob-paper);
}

.page-about .about-route p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: #B9C4D6;
}

.page-about .about-route__go {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--ob-font-mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--ob-gold);
  border-bottom: 1px dashed rgba(242, 169, 59, 0.55);
  padding-bottom: 2px;
}

.page-about .about-note {
  margin-top: clamp(24px, 3.4vw, 36px);
  padding: clamp(20px, 3vw, 28px);
  border-radius: 16px;
  background: rgba(245, 238, 225, 0.07);
  border: 1px solid var(--ob-glass-line);
  border-left: 3px solid var(--ob-gold);
  display: grid;
  gap: 18px;
}

.page-about .about-note__text {
  margin: 0;
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.82;
  color: #C9D4E6;
}

.page-about .about-note__mail {
  font-family: var(--ob-font-mono);
  font-weight: 700;
  color: var(--ob-gold);
  letter-spacing: 0.02em;
  word-break: break-all;
}

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

/* ---------- 窄屏以下收敛为单列 ---------- */
@media (max-width: 479px) {
  .page-about .about-chapter__num {
    font-size: 34px;
  }

  .page-about .about-steps li {
    padding-left: 46px;
  }

  .page-about .about-steps li::before {
    width: 32px;
    height: 32px;
    font-size: 12px;
    border-radius: 9px;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 780px) {
  .page-about .about-duties {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-hero__acts {
    margin-top: 30px;
  }
}

@media (min-width: 820px) {
  .page-about .about-cycles {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-pace__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .about-next__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 横向时间轴 ---------- */
@media (min-width: 880px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 0;
    align-items: start;
  }

  .page-about .about-chapter__num {
    position: sticky;
    top: calc(var(--ob-header-h) + 22px);
  }

  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(22px, 3vw, 40px);
    padding: 34px 0 0;
    margin-top: clamp(34px, 4vw, 52px);
    border-left: 0;
    border-top: 2px dashed rgba(31, 27, 22, 0.22);
  }

  .page-about .about-stage__dot {
    left: 0;
    top: -42px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-path__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.94fr);
    align-items: start;
  }

  .page-about .about-note {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 28px;
  }
}

@media (min-width: 980px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(280px, 0.78fr);
    align-items: end;
    gap: clamp(30px, 5vw, 60px);
  }

  .page-about .about-crumbs {
    grid-column: 1 / -1;
  }

  .page-about .about-hero__panel {
    padding: 26px 24px 28px;
  }
}

/* ---------- 触屏设备：展开说明常显 ---------- */
@media (hover: none) {
  .page-about .about-duty__more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }

  .page-about .about-duty:hover,
  .page-about .about-duty:focus {
    transform: none;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-duty,
  .page-about .about-route,
  .page-about .about-duty__more,
  .page-about .about-crumbs a {
    transition: none;
  }

  .page-about .about-chapter__num {
    position: static;
  }
}
<<<END>>>