/* ============================================================
   品牌介绍页 · page-about
   ============================================================ */

.page-about {
  display: block;
  background: var(--sea);
  color: var(--white);
  overflow-x: hidden;
  overflow-x: clip;
  --ab-stroke: rgba(30, 77, 107, .85);
  --ab-stroke-dark: rgba(36, 30, 26, .24);
  --ab-body-dark: rgba(36, 30, 26, .78);
  --ab-mute-dark: rgba(36, 30, 26, .56);
}

.page-about h2 {
  margin: 0;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.18;
  letter-spacing: -.02em;
  font-weight: 800;
}

.page-about h3 {
  margin: 0;
  font-size: clamp(17px, 2.1vw, 21px);
  line-height: 1.32;
  letter-spacing: -.01em;
  font-weight: 800;
}

.page-about p {
  margin: 0;
}

/* ---------- 顶栏 ---------- */

.page-about .about-topline {
  padding-block: clamp(18px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-block: clamp(24px, 4.5vw, 60px) clamp(60px, 9vw, 130px);
}

.page-about .about-hero__bg {
  position: absolute;
  inset: -10% -6% auto;
  height: 122%;
  z-index: -1;
  opacity: .34;
}

.page-about .about-hero__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 55% 38%;
}

.page-about .about-hero__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(180deg, rgba(7, 26, 51, .34) 0%, rgba(7, 26, 51, .84) 54%, var(--sea) 97%),
    radial-gradient(120% 82% at 10% 6%, rgba(53, 240, 208, .16), transparent 62%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__rail {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding-top: 12px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-hero__body {
  display: grid;
  gap: 0;
}

.page-about h1 {
  margin: 0;
  max-width: 22ch;
  font-size: clamp(31px, 6vw, 60px);
  line-height: 1.07;
  letter-spacing: -.03em;
  font-weight: 900;
}

.page-about .about-hero__lead {
  margin-top: clamp(18px, 2.6vw, 28px);
  max-width: 58ch;
  font-size: clamp(16px, 1.9vw, 18px);
  line-height: 1.78;
  color: var(--txt-72);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 4vw, 42px);
}

@media (min-width: 920px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(140px, 190px) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 82px);
    align-items: start;
  }
  .page-about .about-hero__rail {
    flex-direction: column;
    gap: 10px;
  }
}

/* ---------- 通用小件 ---------- */

.page-about .about-kicker {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-kicker--dark {
  color: var(--brown);
  border-bottom: 3px solid var(--orange);
  padding-bottom: 4px;
}

.page-about .about-rail-mark {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--txt-58);
}

.page-about .about-tag {
  display: inline-flex;
  align-items: center;
  line-height: 1;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  padding: 4px 9px;
  border: 1px solid;
}

.page-about .about-tag--dark {
  color: var(--brown);
  border-color: var(--ab-stroke-dark);
}

/* ---------- 章节外壳 ---------- */

.page-about .about-section {
  padding-block: clamp(54px, 7.8vw, 118px);
}

.page-about .about-section--deep {
  background:
    radial-gradient(120% 100% at 88% 4%, rgba(138, 108, 255, .14), transparent 58%),
    var(--sea);
}

.page-about .about-section--ink {
  background: var(--ink);
  border-top: 1px solid var(--ab-stroke);
  border-bottom: 1px solid var(--ab-stroke);
}

.page-about .about-section--paper {
  background: var(--paper);
  color: var(--brown);
  border-top: 1px solid var(--ab-stroke-dark);
  border-bottom: 1px solid var(--ab-stroke-dark);
}

/* ---------- 左轨 + 右内容 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 8px 16px;
  flex-wrap: wrap;
  padding-top: 10px;
  border-top: 2px solid var(--cyan);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: clamp(32px, 4.4vw, 52px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--cyan);
}

.page-about .about-rail__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--txt-58);
}

.page-about .about-rail--dark {
  border-top-color: var(--brown);
}

.page-about .about-rail--dark .about-rail__num {
  color: var(--orange);
}

.page-about .about-rail--dark .about-rail__label {
  color: var(--ab-mute-dark);
}

.page-about .about-body {
  display: grid;
  gap: 16px;
  max-width: 74ch;
}

.page-about .about-body > h2 {
  margin-bottom: 2px;
}

.page-about .about-body > p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--txt-72);
}

.page-about .about-section--paper .about-body > p {
  color: var(--ab-body-dark);
}

.page-about .about-body > .about-lead {
  font-size: clamp(16px, 1.95vw, 18px);
  line-height: 1.78;
  color: rgba(245, 249, 255, .86);
}

.page-about .about-section--paper .about-body > .about-lead,
.page-about .about-lead--dark {
  color: rgba(36, 30, 26, .86);
}

@media (min-width: 940px) {
  .page-about .about-split {
    grid-template-columns: minmax(150px, 202px) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 92px);
    align-items: start;
  }
  .page-about .about-rail {
    position: sticky;
    top: clamp(92px, 14vh, 132px);
    flex-direction: column;
    gap: 8px;
  }
}

/* ---------- 章节头 ---------- */

.page-about .about-head {
  display: grid;
  gap: 14px;
  max-width: 68ch;
  margin-bottom: clamp(28px, 4.4vw, 52px);
}

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  margin: clamp(26px, 4vw, 46px) 0;
  padding: 10px;
  border: 1px solid var(--ab-stroke-dark);
  background: rgba(255, 255, 255, .58);
  box-shadow: 10px 12px 0 rgba(36, 30, 26, .09);
}

.page-about .about-figure--tight {
  margin-block: clamp(20px, 3vw, 32px);
}

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

/* ---------- 三条内容线 ---------- */

.page-about .line-grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .line-card {
  display: flex;
  flex-direction: column;
  gap: 11px;
  padding: clamp(20px, 2.6vw, 28px);
  border: 1px solid var(--ab-stroke-dark);
  background: rgba(255, 255, 255, .52);
  box-shadow: 6px 7px 0 rgba(36, 30, 26, .07);
  transition:
    transform .35s var(--ease),
    box-shadow .35s var(--ease),
    border-color .35s var(--ease);
}

.page-about .line-card:hover {
  transform: translate(-2px, -3px);
  box-shadow: 10px 12px 0 rgba(36, 30, 26, .1);
  border-color: var(--orange);
}

.page-about .line-card__top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}

.page-about .line-card__count {
  font-family: var(--font-mono);
  font-size: clamp(27px, 3.3vw, 36px);
  line-height: 1;
  letter-spacing: -.04em;
  color: var(--brown);
}

.page-about .line-card__count span {
  font-size: .42em;
  letter-spacing: .02em;
  margin-left: 3px;
  color: var(--ab-mute-dark);
}

.page-about .line-card > p {
  flex: 1 1 auto;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(36, 30, 26, .74);
}

.page-about .line-card__link {
  align-self: flex-start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--brown);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(36, 30, 26, .32);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .line-card__link:hover,
.page-about .line-card__link:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

@media (min-width: 760px) {
  .page-about .line-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 团队分组 ---------- */

.page-about .team-list {
  display: grid;
  gap: 12px;
  margin-top: clamp(22px, 3.2vw, 36px);
}

.page-about .team-card {
  border: 1px solid var(--ab-stroke);
  background: rgba(7, 26, 51, .52);
  transition: border-color .3s var(--ease), background-color .3s var(--ease);
}

.page-about .team-card[open] {
  border-color: var(--cyan);
  background: rgba(7, 26, 51, .82);
}

.page-about .team-card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

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

.page-about .team-card__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--orange);
}

.page-about .team-card__name {
  flex: 1 1 auto;
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .team-card__hint {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--txt-58);
}

.page-about .team-card__body {
  display: grid;
  gap: 12px;
  margin-top: 2px;
  padding: 16px 18px 18px;
  border-top: 1px dashed var(--ab-stroke);
}

.page-about .team-card__body p {
  font-size: 15px;
  line-height: 1.75;
  color: var(--txt-72);
}

.page-about .team-card__body ul {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 7px;
}

.page-about .team-card__body li {
  position: relative;
  padding-left: 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--txt-58);
}

.page-about .team-card__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .64em;
  width: 8px;
  height: 2px;
  background: var(--cyan);
}

/* ---------- 上线四道关 ---------- */

.page-about .gate-list {
  margin: clamp(22px, 3.4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--ab-stroke-dark);
}

.page-about .gate {
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-bottom: 1px solid var(--ab-stroke-dark);
}

.page-about .gate__idx {
  font-family: var(--font-mono);
  font-size: 22px;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
}

.page-about .gate__body {
  display: grid;
  gap: 6px;
}

.page-about .gate h3 {
  font-size: 17px;
  color: var(--brown);
}

.page-about .gate p {
  font-size: 15px;
  line-height: 1.72;
  color: rgba(36, 30, 26, .72);
}

@media (min-width: 720px) {
  .page-about .gate {
    grid-template-columns: 74px minmax(0, 1fr);
    gap: clamp(20px, 3vw, 44px);
    align-items: start;
  }
}

/* ---------- 用户构成 ---------- */

.page-about .audience {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .audience-figures {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: clamp(20px, 3vw, 38px);
}

.page-about .audience-stat {
  display: grid;
  gap: 8px;
  padding-top: 14px;
  border-top: 2px solid var(--cyan);
}

.page-about .audience-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6.2vw, 64px);
  line-height: .96;
  letter-spacing: -.05em;
  color: var(--white);
}

.page-about .audience-stat__num span {
  font-size: .38em;
  letter-spacing: 0;
  margin-left: 4px;
  color: var(--cyan);
}

.page-about .audience-stat__label {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--txt-58);
}

.page-about .audience-copy {
  display: grid;
  gap: 16px;
  max-width: 74ch;
}

.page-about .audience-copy p {
  font-size: 16px;
  line-height: 1.8;
  color: var(--txt-72);
}

@media (min-width: 860px) {
  .page-about .audience {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    align-items: start;
    gap: clamp(44px, 7vw, 96px);
  }
}

/* ---------- 文字链 ---------- */

.page-about .about-inline-link {
  justify-self: start;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--cyan);
  text-decoration: none;
  padding-bottom: 3px;
  border-bottom: 1px solid rgba(53, 240, 208, .45);
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-inline-link:hover,
.page-about .about-inline-link:focus-visible {
  color: var(--white);
  border-color: var(--white);
}

.page-about .about-inline-link--dark {
  color: var(--brown);
  border-bottom-color: rgba(36, 30, 26, .4);
}

.page-about .about-inline-link--dark:hover,
.page-about .about-inline-link--dark:focus-visible {
  color: var(--orange);
  border-color: var(--orange);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  padding-block: clamp(54px, 8vw, 112px);
  border-top: 1px solid var(--ab-stroke);
  background:
    radial-gradient(92% 120% at 88% 0%, rgba(138, 108, 255, .2), transparent 62%),
    radial-gradient(80% 110% at 6% 100%, rgba(255, 122, 47, .12), transparent 58%),
    var(--sea);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 18px;
  justify-items: start;
}

.page-about .about-cta h2 {
  max-width: 22ch;
  font-size: clamp(26px, 3.8vw, 42px);
}

.page-about .about-cta p {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--txt-72);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 8px;
}

/* ---------- 滚动显现 ---------- */

.page-about [data-reveal] {
  transition: transform .6s var(--ease);
}

.page-about [data-reveal]:not(.is-visible) {
  transform: translateY(22px);
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal],
  .page-about [data-reveal]:not(.is-visible) {
    transform: none;
    transition: none;
  }
  .page-about .line-card,
  .page-about .team-card,
  .page-about .about-inline-link,
  .page-about .line-card__link {
    transition: none;
  }
  .page-about .line-card:hover {
    transform: none;
  }
}