.page-about {
  --about-gold-soft: rgba(212, 175, 55, .24);
  --about-line: rgba(10, 31, 68, .14);
  --about-line-light: rgba(255, 255, 255, .18);
  overflow-x: hidden;
  background: var(--mist);
  color: var(--ink);
}

/* 面包屑 */
.about-crumbs {
  background: var(--navy-deep);
  padding: calc(var(--header-h) + 16px) var(--side-gutter) 0;
}
.about-crumbs__list {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 0 22px;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  color: rgba(255, 255, 255, .72);
  font: 500 13px/1.5 var(--font-body);
}
.about-crumbs__list a {
  color: var(--gold);
  text-decoration: none;
  transition: color .2s;
}
.about-crumbs__list a:hover {
  color: var(--orange);
}
.about-crumbs__list [aria-current="page"] {
  color: rgba(255, 255, 255, .85);
}
.about-crumbs__sep {
  color: rgba(255, 255, 255, .4);
}

/* 首屏品牌叙事 */
.about-hero {
  position: relative;
  overflow: hidden;
  color: var(--white);
  background-image:
    linear-gradient(rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .04) 1px, transparent 1px),
    linear-gradient(135deg, var(--navy-deep), var(--navy) 58%, var(--navy-light));
  background-size: 56px 56px, 56px 56px, auto;
}
.about-hero::before,
.about-hero::after {
  content: "";
  position: absolute;
  pointer-events: none;
}
.about-hero::before {
  inset: auto -6% 8% 58%;
  height: 180px;
  background: radial-gradient(closest-side, var(--about-gold-soft), transparent 72%);
}
.about-hero::after {
  inset: 0 0 0 auto;
  width: 26%;
  background: linear-gradient(90deg, transparent, rgba(10, 31, 68, .6));
}
.about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--container);
  margin: 0 auto;
  padding: clamp(44px, 7vw, 92px) var(--side-gutter) 30px;
  display: grid;
  gap: 34px;
}
.about-hero__kicker {
  margin: 0 0 16px;
  color: var(--gold);
  font: 700 13px/1.5 var(--font-display);
  letter-spacing: .16em;
  text-transform: uppercase;
}
.about-hero h1 {
  margin: 0 0 18px;
  font-size: clamp(2rem, 6.2vw, 3.6rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -.02em;
  max-width: 13em;
}
.about-hero__lead {
  margin: 0 0 24px;
  color: rgba(255, 255, 255, .84);
  font-size: 16px;
  line-height: 1.8;
  max-width: 30em;
}
.about-hero__meta {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 14px;
  color: rgba(255, 255, 255, .72);
}
.about-hero__meta li {
  position: relative;
  padding-left: 16px;
}
.about-hero__meta li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 6px;
  height: 6px;
  transform: translateY(-50%) rotate(45deg);
  background: var(--gold);
}
.about-hero__fig {
  margin: 0;
  border: 1px solid rgba(212, 175, 55, .32);
  border-radius: var(--radius);
  overflow: hidden;
  background: rgba(255, 255, 255, .06);
}
.about-hero__fig img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.about-hero__baseline {
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--side-gutter) 34px;
  display: flex;
  align-items: center;
  gap: 14px;
  color: rgba(255, 255, 255, .66);
  font: 700 13px/1.4 var(--font-display);
  letter-spacing: .14em;
  text-transform: uppercase;
}
.about-hero__bar {
  width: 26px;
  height: 1px;
  background: var(--gold);
  opacity: .85;
}

/* 章节通用头 */
.about-section-head {
  max-width: var(--container);
  margin: 0 auto;
  display: flex;
  align-items: flex-start;
  gap: 18px;
}
.about-section-index {
  flex: none;
  min-width: .8em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(4rem, 12vw, 7rem);
  line-height: .9;
  letter-spacing: -.05em;
  color: var(--gold);
  opacity: .3;
}
.about-section-head .kicker {
  margin: 8px 0 4px;
  color: var(--orange);
}
.about-section-head h2 {
  margin: 0;
  font-size: clamp(1.4rem, 4vw, 2.35rem);
  line-height: 1.2;
  letter-spacing: -.01em;
}

/* 01 品牌缘起 */
.about-origin {
  padding: clamp(48px, 8vw, 96px) var(--side-gutter);
  background: var(--mist);
}
.about-origin__layout {
  max-width: var(--container);
  margin: 44px auto 0;
  display: grid;
  gap: 40px;
}
.about-origin__coord {
  position: relative;
  padding: 28px;
  background: var(--white);
  border: 1px solid var(--about-line);
  border-radius: 2px;
  box-shadow: var(--shadow-sm);
}
.about-origin__coord-mark {
  display: inline-flex;
  width: 52px;
  height: 52px;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(212, 175, 55, .5);
  background: rgba(212, 175, 55, .06);
  margin-bottom: 16px;
}
.about-origin__coord h3 {
  margin: 0 0 6px;
  font-size: 1.15rem;
}
.about-origin__geo {
  margin: 0 0 12px;
  color: var(--gold);
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: .08em;
}
.about-origin__coord p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}
.about-origin__icp {
  display: inline-block;
  margin-top: 14px;
  padding: 6px 12px;
  border: 1px solid rgba(10, 31, 68, .18);
  background: rgba(10, 31, 68, .04);
  color: var(--ink);
  font-size: 12px;
  letter-spacing: .06em;
}
.about-origin__timeline {
  position: relative;
  padding-left: 30px;
}
.about-origin__timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), rgba(212, 175, 55, .12));
}
.about-origin__timeline::after {
  content: "";
  position: absolute;
  inset: 0 0 auto auto;
  width: 96px;
  height: 100%;
  background: repeating-linear-gradient(-45deg, rgba(212, 175, 55, .05) 0 2px, transparent 2px 8px);
  pointer-events: none;
}
.about-origin__step {
  position: relative;
  padding: 0 0 26px;
}
.about-origin__step:last-child {
  padding-bottom: 0;
}
.about-origin__dot {
  position: absolute;
  left: -26px;
  top: 9px;
  width: 11px;
  height: 11px;
  background: var(--gold);
  border-radius: 2px;
  transform: rotate(45deg);
  box-shadow: 0 0 0 4px var(--about-gold-soft);
}
.about-origin__step-head h3 {
  margin: 0;
}
.about-origin__trigger {
  appearance: none;
  border: 0;
  background: transparent;
  padding: 6px 0;
  font: 700 clamp(1.05rem, 2.6vw, 1.35rem) var(--font-display);
  color: var(--navy);
  text-align: left;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 10px;
}
.about-origin__trigger::after {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  transform: rotate(45deg) translateY(-2px);
  transition: transform .2s var(--ease);
}
.about-origin__step:has(.about-origin__trigger[aria-expanded="true"]) .about-origin__trigger::after {
  transform: rotate(-135deg) translateY(-1px);
}
.about-origin__body {
  margin-top: 8px;
  max-width: 44em;
}
.about-origin__body p {
  margin: 0;
  color: var(--slate);
  font-size: 14px;
  line-height: 1.8;
}

/* 02 三阶段适配 */
.about-phases {
  position: relative;
  padding: clamp(48px, 8vw, 96px) var(--side-gutter);
  color: var(--white);
  background-image:
    linear-gradient(160deg, rgba(255, 255, 255, .05) 0, transparent 40%),
    linear-gradient(135deg, var(--navy-deep), var(--navy) 60%, var(--navy-light));
}
.about-phases__inner {
  max-width: var(--container);
  margin: 0 auto;
}
.about-phases .about-section-index {
  opacity: .45;
}
.about-phases h2 {
  color: var(--white);
}
.about-phases .kicker {
  color: var(--orange);
}
.about-phases__lead {
  max-width: 48em;
  margin: 28px auto 0;
  color: rgba(255, 255, 255, .78);
  line-height: 1.8;
}
.about-phases__list {
  list-style: none;
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}
.about-phases__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  padding: 22px;
  border: 1px solid var(--about-line-light);
  border-radius: 2px;
  background: rgba(255, 255, 255, .05);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), background .25s;
}
.about-phases__item:hover {
  transform: translateY(-2px);
  background: rgba(255, 255, 255, .08);
  box-shadow: var(--shadow-lg);
}
.about-phases__num {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 2.3rem;
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.about-phases__text h3 {
  margin: 0 0 8px;
  color: var(--white);
  font-size: 1.2rem;
}
.about-phases__text p {
  margin: 0;
  color: rgba(255, 255, 255, .78);
  font-size: 14px;
  line-height: 1.75;
}
.about-phases__fig {
  margin: 38px 0 0;
  border: 1px solid rgba(212, 175, 55, .32);
  border-radius: 2px;
  overflow: hidden;
  background: rgba(255, 255, 255, .06);
}
.about-phases__fig img {
  display: block;
  width: 100%;
  height: auto;
}

/* 03 新手指南设计逻辑 */
.about-guide {
  padding: clamp(48px, 8vw, 96px) var(--side-gutter);
  background: var(--mist);
}
.about-guide__inner {
  max-width: var(--container);
  margin: 0 auto;
}
.about-guide__grid {
  margin-top: 40px;
  display: grid;
  gap: 28px;
}
.about-guide__lead {
  margin: 0 0 24px;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.8;
}
.about-guide__paths {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}
.about-guide__path {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  padding: 20px;
  background: var(--white);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--gold);
  border-radius: 2px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s var(--ease), box-shadow .25s;
}
.about-guide__path:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}
.about-guide__no {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.6rem;
  line-height: 1;
  color: var(--navy);
  font-variant-numeric: tabular-nums;
}
.about-guide__path h3 {
  margin: 0 0 6px;
  font-size: 1.05rem;
}
.about-guide__path p {
  margin: 0;
  color: var(--slate);
  font-size: 14px;
  line-height: 1.65;
}
.about-guide__insight {
  position: relative;
  overflow: hidden;
  padding: 32px;
  background: var(--navy);
  color: var(--white);
  border-radius: 2px;
  box-shadow: var(--shadow-md);
}
.about-guide__insight::after {
  content: "";
  position: absolute;
  right: -40px;
  bottom: -40px;
  width: 140px;
  height: 140px;
  transform: rotate(45deg);
  background: var(--about-gold-soft);
}
.about-guide__percent {
  display: block;
  margin-bottom: 12px;
  color: var(--gold);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3rem, 10vw, 5rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
}
.about-guide__insight p {
  position: relative;
  z-index: 1;
  margin: 0;
  color: rgba(255, 255, 255, .84);
  line-height: 1.7;
}
.about-guide__insight .about-guide__note {
  margin-top: 12px;
  color: rgba(255, 255, 255, .64);
  font-size: 14px;
}

/* 04 资质与协同 */
.about-cred {
  padding: clamp(48px, 8vw, 96px) var(--side-gutter);
  background: var(--white);
}
.about-cred__inner {
  max-width: var(--container);
  margin: 0 auto;
}
.about-cred__lead {
  max-width: 52em;
  margin: 28px 0 0;
  line-height: 1.8;
}
.about-badges {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.about-badges__item {
  padding: 24px;
  background: var(--mist);
  border: 1px solid var(--about-line);
  border-radius: 2px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s var(--ease), box-shadow .25s var(--ease), border-color .25s;
}
.about-badges__item:hover {
  transform: translateY(-4px);
  border-color: var(--gold);
  box-shadow: var(--shadow-md);
}
.about-badges__code {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 2px solid rgba(212, 175, 55, .6);
  color: var(--orange);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 13px;
  letter-spacing: .14em;
  text-transform: uppercase;
}
.about-badges__item h3 {
  margin: 0 0 8px;
  font-size: 1.08rem;
}
.about-badges__item p {
  margin: 0;
  color: var(--slate);
  font-size: 14px;
  line-height: 1.7;
}
.about-cred__eco {
  margin-top: 44px;
  display: grid;
  gap: 28px;
  align-items: center;
}
.about-cred__fig {
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: 2px;
  overflow: hidden;
  background: var(--mist);
}
.about-cred__fig img {
  display: block;
  width: 100%;
  height: auto;
}
.about-cred__note h3 {
  margin: 0 0 10px;
}
.about-cred__note p {
  margin: 0 0 14px;
  color: var(--slate);
  font-size: 14px;
  line-height: 1.8;
}
.about-cred__note .btn {
  margin-top: 18px;
}

/* 结尾承诺 */
.about-promise {
  padding: 56px var(--side-gutter) 72px;
  background:
    linear-gradient(90deg, rgba(212, 175, 55, .55) 0 3px, transparent 3px),
    var(--navy-deep);
  color: var(--white);
}
.about-promise__inner {
  max-width: var(--container);
  margin: 0 auto;
}
.about-promise .kicker {
  color: var(--gold);
}
.about-promise blockquote {
  margin: 18px 0 28px;
  max-width: 60em;
  color: rgba(255, 255, 255, .86);
  font-size: 16px;
  line-height: 1.85;
}
.about-promise__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
}
.about-promise__link {
  padding: 8px 0;
  border-bottom: 2px solid var(--gold);
  color: var(--white);
  font-weight: 600;
  text-decoration: none;
  transition: color .2s, border-color .2s;
}
.about-promise__link:hover {
  color: var(--gold);
  border-bottom-color: var(--orange);
}

/* 响应式 */
@media (min-width: 760px) {
  .about-hero__inner {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }
  .about-origin__layout {
    grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr);
    gap: 40px;
    align-items: start;
  }
  .about-guide__paths {
    grid-template-columns: 1fr 1fr;
  }
  .about-badges {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1020px) {
  .about-phases__list {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
    align-items: start;
  }
  .about-phases__item:nth-child(2) {
    margin-top: 32px;
  }
  .about-phases__item:nth-child(3) {
    margin-top: 64px;
  }
  .about-guide__grid {
    grid-template-columns: 1.1fr .9fr;
    align-items: center;
  }
  .about-cred__eco {
    grid-template-columns: 1fr 1fr;
  }
  .about-badges {
    grid-template-columns: repeat(3, 1fr);
  }
}