/* 页面级变量 */
.page-about {
  --about-rail-left: 24px;
  --about-axis-w: 48px;
  --about-year-w: 176px;
  overflow-x: clip;
}

/* Hero */
.page-about .about-hero {
  position: relative;
  background:
    radial-gradient(circle at 82% 18%, rgba(201, 160, 99, 0.28) 0, rgba(201, 160, 99, 0.05) 34%, transparent 55%),
    linear-gradient(160deg, #0b1f3a 0%, #123052 58%, #0b1f3a 100%);
  color: #fff;
  padding: clamp(3.5rem, 9vw, 6.5rem) 0;
  overflow: hidden;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -130px;
  top: -130px;
  width: 340px;
  height: 340px;
  border: 64px solid rgba(201, 160, 99, 0.16);
  border-radius: 50%;
  pointer-events: none;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 8%;
  bottom: -92px;
  width: 240px;
  height: 240px;
  border: 3px solid rgba(192, 192, 192, 0.24);
  border-radius: 50%;
  box-shadow: 0 0 0 30px rgba(43, 92, 138, 0.12);
  pointer-events: none;
}
.page-about .about-hero .breadcrumbs {
  position: relative;
  z-index: 1;
  margin-bottom: clamp(2rem, 5vw, 3.5rem);
}
.page-about .about-hero .breadcrumbs a {
  color: rgba(255, 255, 255, 0.72);
}
.page-about .about-hero .breadcrumbs a[aria-current="page"] {
  color: var(--color-gold);
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 820px;
  border-left: 4px solid var(--color-gold);
  padding-left: clamp(18px, 4vw, 40px);
}
.page-about .about-hero__kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-gold);
}
.page-about .about-hero__index {
  color: var(--color-silver);
  font-weight: 400;
  letter-spacing: 0.1em;
}
.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 6vw, 4.15rem);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.02em;
}
.page-about .about-hero__lead {
  max-width: 640px;
  margin: 0 0 32px;
  font-family: var(--font-body);
  font-size: clamp(0.94rem, 1.4vw, 1.06rem);
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.82);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}
.page-about .about-hero__btn-light {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0.85rem 1.55rem;
  border: 2px solid rgba(255, 255, 255, 0.72);
  color: #fff;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.92rem;
  line-height: 1;
  text-decoration: none;
  transition: border-color 0.25s ease, color 0.25s ease, background 0.25s ease;
}
.page-about .about-hero__btn-light:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
  background: rgba(201, 160, 99, 0.08);
}

/* 我们的起点 */
.page-about .about-origin {
  background: var(--color-light);
  padding: clamp(3.5rem, 9vw, 7rem) 0;
}
.page-about .about-origin__grid {
  display: grid;
  gap: 40px;
  margin-top: 44px;
}
.page-about .about-origin__copy p {
  max-width: 640px;
}
.page-about .about-origin__lead {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
  font-weight: 900;
  line-height: 1.6;
  color: var(--color-ink);
}
.page-about .about-origin__copy p:not(.about-origin__lead) {
  margin: 0 0 16px;
  color: var(--color-muted);
  font-family: var(--font-body);
  line-height: 1.85;
}
.page-about .about-origin__stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
  align-items: center;
  padding: 30px 18px;
  background: var(--color-deep);
  border: 3px solid var(--color-gold);
  box-shadow: 10px 10px 0 0 var(--color-deep);
}
.page-about .about-origin__stat {
  text-align: center;
}
.page-about .about-origin__num {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3vw, 2.6rem);
  font-weight: 900;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-gold);
}
.page-about .about-origin__num small {
  font-size: 0.55em;
  color: var(--color-silver);
}
.page-about .about-origin__desc {
  display: block;
  margin-top: 10px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: rgba(255, 255, 255, 0.72);
}

/* 里程碑与时间线 */
.page-about .about-milestones {
  position: relative;
  overflow: hidden;
  background: var(--color-deep);
  padding: clamp(3.5rem, 9vw, 7rem) 0;
}
.page-about .about-milestones::before {
  content: "";
  position: absolute;
  right: -80px;
  top: 60px;
  width: 320px;
  height: 320px;
  border: 2px solid rgba(201, 160, 99, 0.22);
  transform: rotate(45deg);
  pointer-events: none;
}
.page-about .about-milestones .container {
  position: relative;
  z-index: 1;
}
.page-about .about-milestones .section-head__title {
  color: #fff;
}
.page-about .about-milestones .section-head__desc {
  margin: 14px 0 0;
  max-width: 680px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.7);
}
.page-about .about-timeline {
  position: relative;
  margin-top: 56px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: var(--about-rail-left);
  top: 10px;
  bottom: 10px;
  width: 3px;
  border-radius: 3px;
  background: linear-gradient(180deg, var(--color-gold) 0%, rgba(201, 160, 99, 0.45) 30%, rgba(192, 192, 192, 0.3) 70%, rgba(201, 160, 99, 0.7) 100%);
}
.page-about .about-timeline__item {
  display: grid;
  grid-template-areas:
    "axis year"
    "axis content";
  grid-template-columns: var(--about-axis-w) 1fr;
  column-gap: 18px;
  margin-bottom: 52px;
}
.page-about .about-timeline__item:last-child {
  margin-bottom: 0;
}
.page-about .about-timeline__axis {
  grid-area: axis;
  display: flex;
  justify-content: center;
}
.page-about .about-timeline__dot {
  width: 18px;
  height: 18px;
  margin-top: 12px;
  border-radius: 50%;
  background: var(--color-gold);
  border: 4px solid var(--color-deep);
  box-shadow: 0 0 0 2px var(--color-gold), 0 0 18px rgba(201, 160, 99, 0.65);
}
.page-about .about-timeline__year {
  grid-area: year;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 3.4vw, 2rem);
  font-weight: 900;
  line-height: 1;
  text-align: left;
  letter-spacing: 0.02em;
  color: var(--color-gold);
  text-shadow: 0 2px 18px rgba(201, 160, 99, 0.3);
  padding-top: 2px;
}
.page-about .about-timeline__content {
  grid-area: content;
}
.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 2vw, 1.35rem);
  font-weight: 900;
  letter-spacing: 0.01em;
  color: #fff;
}
.page-about .about-timeline__text {
  max-width: 620px;
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.92rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.74);
}
.page-about .about-timeline__img {
  display: block;
  width: 100%;
  max-width: 460px;
  height: auto;
  object-fit: cover;
  margin-top: 18px;
  border: 2px solid rgba(201, 160, 99, 0.55);
  box-shadow: 8px 8px 0 0 rgba(0, 0, 0, 0.32);
}
.page-about .about-milestones__footnote {
  max-width: 720px;
  margin-top: 52px;
  padding: 20px 26px;
  border-left: 3px solid var(--color-gold);
  background: rgba(11, 31, 58, 0.6);
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.72);
}

/* 为什么选择我们 */
.page-about .about-reasons {
  background: var(--color-light);
  padding: clamp(3.5rem, 9vw, 7rem) 0 clamp(3.5rem, 8vw, 5rem);
}
.page-about .about-reasons__grid {
  display: grid;
  gap: clamp(2rem, 5vw, 4rem);
  margin-top: 48px;
}
.page-about .about-reason {
  display: grid;
  grid-template-columns: 48px 1fr;
  column-gap: 16px;
  padding: 22px 0;
  border-bottom: 1px solid rgba(11, 31, 58, 0.12);
}
.page-about .about-reason:first-child {
  padding-top: 0;
}
.page-about .about-reason__no {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 900;
  line-height: 1.4;
  color: var(--color-gold);
}
.page-about .about-reason__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.12rem;
  font-weight: 900;
  color: var(--color-ink);
}
.page-about .about-reason__text {
  max-width: 560px;
  margin: 0;
  font-family: var(--font-body);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--color-muted);
}
.page-about .about-reasons__visual {
  position: relative;
}
.page-about .about-reasons__visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
  border: 3px solid var(--color-deep);
  box-shadow: 10px 10px 0 0 var(--color-gold);
}
.page-about .about-reasons__badge {
  position: absolute;
  left: -14px;
  bottom: -18px;
  padding: 14px 18px;
  background: var(--color-deep);
  border: 2px solid var(--color-gold);
  box-shadow: 5px 5px 0 0 rgba(11, 31, 58, 0.3);
}
.page-about .about-reasons__badge-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.55rem;
  font-weight: 900;
  line-height: 1;
  color: var(--color-gold);
}
.page-about .about-reasons__badge small {
  display: block;
  margin-top: 6px;
  font-family: var(--font-body);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.8);
}

/* 新版界面说明 */
.page-about .about-update {
  background: linear-gradient(155deg, #eef2f8 0%, #f7f9fc 55%, #e5eaf2 100%);
  padding: clamp(3.5rem, 9vw, 7rem) 0;
}
.page-about .about-update__grid {
  display: grid;
  gap: 52px;
  margin-top: 48px;
  align-items: center;
}
.page-about .about-update__lead {
  margin: 0 0 24px;
  padding-left: 18px;
  border-left: 4px solid var(--color-gold);
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 900;
  line-height: 1.65;
  color: var(--color-deep);
}
.page-about .about-update__copy p:not(.about-update__lead) {
  margin: 0 0 18px;
  font-family: var(--font-body);
  line-height: 1.8;
  color: var(--color-muted);
}
.page-about .about-update__list {
  counter-reset: update-item;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-update__list li {
  counter-increment: update-item;
  position: relative;
  padding: 16px 0 16px 40px;
  border-bottom: 1px solid rgba(11, 31, 58, 0.1);
  font-family: var(--font-body);
  font-size: 0.92rem;
  line-height: 1.8;
  color: var(--color-muted);
}
.page-about .about-update__list li:last-child {
  border-bottom: none;
}
.page-about .about-update__list li::before {
  content: counter(update-item, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  background: var(--color-deep);
  color: var(--color-gold);
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 900;
}
.page-about .about-update__list strong {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-display);
  font-size: 0.95rem;
  font-weight: 900;
  color: var(--color-deep);
}
.page-about .about-update__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}
.page-about .about-update__device {
  padding: 12px;
  background: var(--color-deep);
  border: 3px solid var(--color-deep);
  box-shadow: 10px 10px 0 0 rgba(11, 31, 58, 0.24);
}
.page-about .about-update__browser {
  overflow: hidden;
  background: var(--color-light);
  border: 1px solid rgba(11, 31, 58, 0.08);
}
.page-about .about-update__chrome {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 10px 12px;
  background: #fff;
  border-bottom: 1px solid rgba(11, 31, 58, 0.08);
}
.page-about .about-update__light {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--color-silver);
}
.page-about .about-update__light--gold {
  background: var(--color-gold);
}
.page-about .about-update__url {
  flex: 1;
  height: 14px;
  margin-left: 4px;
  border-radius: 999px;
  background: rgba(11, 31, 58, 0.08);
}
.page-about .about-update__screen {
  display: flex;
  min-height: 260px;
}
.page-about .about-update__sidebar {
  display: flex;
  flex-direction: column;
  gap: 12px;
  width: 34%;
  padding: 20px 14px;
  background: var(--color-deep);
}
.page-about .about-update__slogo {
  width: 32px;
  height: 32px;
  margin-bottom: 16px;
  background: var(--color-gold);
  clip-path: polygon(50% 0, 100% 32%, 82% 100%, 50% 78%, 18% 100%, 0 32%);
}
.page-about .about-update__sline {
  width: 100%;
  height: 8px;
  border-radius: 2px;
  background: rgba(255, 255, 255, 0.28);
}
.page-about .about-update__sline--active {
  width: 82%;
  background: var(--color-gold);
}
.page-about .about-update__sline--short {
  width: 64%;
}
.page-about .about-update__main {
  display: flex;
  flex-direction: column;
  gap: 12px;
  flex: 1;
  padding: 26px 22px;
  background: var(--color-light);
}
.page-about .about-update__mtitle {
  width: 58%;
  height: 16px;
  border-radius: 2px;
  background: var(--color-deep);
}
.page-about .about-update__mtext {
  width: 100%;
  height: 8px;
  border-radius: 2px;
  background: rgba(11, 31, 58, 0.14);
}
.page-about .about-update__mtext--short {
  width: 82%;
}
.page-about .about-update__mbtn {
  width: 88px;
  height: 26px;
  margin-top: 8px;
  background: var(--color-gold);
  box-shadow: 3px 3px 0 0 var(--color-deep);
}

/* CTA 收尾 */
.page-about .about-cta {
  position: relative;
  overflow: hidden;
  background: var(--color-deep);
  padding: clamp(4rem, 10vw, 7rem) 0;
  text-align: center;
  color: #fff;
}
.page-about .about-cta::before {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  width: 360px;
  height: 360px;
  transform: translate(-50%, -50%);
  border: 3px solid rgba(201, 160, 99, 0.24);
  border-radius: 50%;
  box-shadow: 0 0 0 48px rgba(201, 160, 99, 0.06);
  pointer-events: none;
}
.page-about .about-cta .container {
  position: relative;
  z-index: 1;
}
.page-about .about-cta__lead {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 4vw, 2.7rem);
  font-weight: 900;
  line-height: 1.3;
}
.page-about .about-cta__sub {
  max-width: 620px;
  margin: 0 auto 36px;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.68);
}
.page-about .about-cta__note {
  margin-top: 30px;
  font-family: var(--font-body);
  font-size: 0.82rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.5);
}

/* 桌面增强 */
@media (min-width: 768px) {
  .page-about {
    --about-rail-left: 204px;
    --about-axis-w: 56px;
  }
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: stretch;
  }
  .page-about .about-timeline__item {
    grid-template-areas: "year axis content";
    grid-template-columns: var(--about-year-w) var(--about-axis-w) 1fr;
    column-gap: 0;
    margin-bottom: 64px;
  }
  .page-about .about-timeline__year {
    padding-top: 6px;
    padding-right: 24px;
    text-align: right;
    font-size: clamp(2.2rem, 4vw, 3.2rem);
  }
  .page-about .about-timeline__dot {
    margin-top: 14px;
  }
  .page-about .about-timeline__img {
    max-width: 560px;
  }
}

@media (min-width: 900px) {
  .page-about .about-reasons__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }
  .page-about .about-update__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
  .page-about .about-update__screen {
    min-height: 320px;
  }
}