/* ===========================================================
   我们是谁 / about
   =========================================================== */

.page-about {
  position: relative;
  padding-top: calc(var(--header-h) + 1rem);
  padding-bottom: clamp(2.5rem, 7vw, 6rem);
  background-color: var(--ink);
  background-image:
    radial-gradient(90% 620px at 12% 0%, rgba(53, 240, 208, .16), transparent 62%),
    radial-gradient(70% 520px at 96% 16%, rgba(255, 90, 54, .14), transparent 66%);
  background-repeat: no-repeat;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  margin-bottom: clamp(1.2rem, 3vw, 2.2rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-bottom: clamp(1.6rem, 5vw, 3rem);
}

.page-about .about-hero__title {
  margin: .55rem 0 0;
  max-width: 20ch;
  font-family: var(--font-head);
  font-size: clamp(2.3rem, 8.4vw, 5.4rem);
  line-height: 1.02;
  letter-spacing: -.015em;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-hero__title span {
  display: block;
  color: var(--cyan);
}

.page-about .about-hero__split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.6rem, 4vw, 3rem);
  margin-top: clamp(1.4rem, 4vw, 2.6rem);
}

.page-about .about-hero__text p {
  max-width: 60ch;
}

.page-about .about-hero__text p + p {
  margin-top: 1rem;
}

.page-about .about-hero__stats {
  display: grid;
  gap: .85rem;
}

.page-about .about-stat {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0 .38rem;
  padding: .9rem 1.05rem 1rem;
  border: var(--bd);
  background: rgba(10, 58, 51, .66);
  box-shadow: var(--shadow-hard);
  transition: border-color .3s var(--ease), transform .3s var(--ease);
}

.page-about .about-stat:hover {
  border-color: var(--cyan);
  transform: translate(-3px, -3px);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: clamp(1.65rem, 4.6vw, 2.4rem);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -.02em;
}

.page-about .about-stat__unit {
  font-size: .82rem;
  color: var(--mist);
}

.page-about .about-stat__label {
  flex: 0 0 100%;
  margin-top: .38rem;
  font-size: .8rem;
  letter-spacing: .06em;
  color: var(--mist);
}

.page-about .about-stat--flame .about-stat__num {
  color: var(--flame);
}

/* 纵向注释 */
.page-about .about-vert {
  display: none;
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.8rem, 5vw, 4rem);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .about-flow {
  min-width: 0;
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  align-self: start;
}

.page-about .about-toc__title {
  margin: 0 0 .8rem;
  padding-bottom: .5rem;
  border-bottom: var(--bd);
  font-family: var(--font-head);
  font-size: .74rem;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-toc__list {
  display: flex;
  flex-wrap: wrap;
  gap: .2rem .95rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: .45rem;
  padding: .26rem 0;
  font-size: .88rem;
  color: var(--mist);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color .26s var(--ease), border-color .26s var(--ease), padding-left .26s var(--ease);
}

.page-about .about-toc__link:hover {
  color: var(--cyan-soft);
}

.page-about .about-toc__link[aria-current="true"] {
  color: var(--cyan);
}

.page-about .about-toc__idx {
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--line);
}

.page-about .about-toc__link[aria-current="true"] .about-toc__idx {
  color: var(--flame);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  position: relative;
  padding-block: clamp(1.8rem, 5vw, 3.4rem);
  border-top: 1px solid var(--line);
}

.page-about .about-sec:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-sec__idx {
  margin: 0 0 .5rem;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  line-height: 1;
  letter-spacing: .05em;
  color: var(--line);
}

.page-about .about-sec h2 {
  margin: 0 0 1rem;
  max-width: 24ch;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 4.4vw, 2.7rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-sec .wm-text {
  max-width: 62ch;
  margin: 0 0 .95rem;
  color: var(--paper);
  line-height: 1.78;
  font-size: .98rem;
  opacity: .92;
}

.page-about .about-mark {
  font-family: var(--font-mono);
  font-size: .95em;
  color: var(--flame);
  padding: 0 .1em;
}

/* ---------- 图片位 ---------- */
.page-about .about-media {
  margin: clamp(1.4rem, 3.4vw, 2.2rem) 0 0;
  border: var(--bd);
  background: var(--panel);
  overflow: hidden;
}

.page-about .about-media--flush {
  margin-top: 0;
}

.page-about .about-media .wm-media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-media .wm-media__caption {
  margin: 0;
  padding: .7rem .95rem;
  border-top: 1px solid var(--line);
  font-size: .78rem;
  letter-spacing: .03em;
  color: var(--mist);
}

/* ---------- 发展历程时间线 ---------- */
.page-about .about-tl {
  position: relative;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--amber) 58%, var(--flame) 100%);
  opacity: .75;
}

.page-about .about-tl__item {
  position: relative;
  padding-left: 2.3rem;
  padding-bottom: clamp(1.3rem, 3vw, 2rem);
}

.page-about .about-tl__item:last-child {
  padding-bottom: 0;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .3rem;
  width: 16px;
  height: 16px;
  border: 2px solid var(--cyan);
  background: var(--ink);
  transform: rotate(45deg);
  transition: background-color .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-tl__item:hover::before {
  background: var(--cyan);
}

.page-about .about-tl__item:last-child::before {
  border-color: var(--flame);
}

.page-about .about-tl__item:last-child:hover::before {
  background: var(--flame);
}

.page-about .about-tl__ver {
  display: inline-block;
  margin-bottom: .55rem;
  padding: .14rem .5rem;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--cyan);
}

.page-about .about-tl__card h3 {
  margin: 0 0 .45rem;
  font-family: var(--font-head);
  font-size: 1.12rem;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-tl__card p {
  max-width: 58ch;
  margin: 0;
  font-size: .94rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 内容准则 ---------- */
.page-about .about-rules {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin: clamp(1.3rem, 3vw, 1.9rem) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-rule {
  padding: 1.2rem 1.15rem 1.35rem;
  border: var(--bd);
  background: rgba(10, 58, 51, .55);
  transition: border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-rule:hover {
  border-color: var(--cyan);
  transform: translate(-4px, -4px);
  box-shadow: var(--shadow-hard);
}

.page-about .about-rule__idx {
  display: block;
  margin-bottom: .65rem;
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .22em;
  color: var(--flame);
}

.page-about .about-rule h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-head);
  font-size: 1.06rem;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-rule p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.6rem);
  margin-top: clamp(1.2rem, 3vw, 1.8rem);
}

.page-about .about-badges {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  margin-top: 1.15rem;
}

.page-about .about-badge {
  padding: .36rem .72rem;
  border: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .06em;
  color: var(--cyan-soft);
  background: rgba(2, 17, 14, .35);
}

/* ---------- 下一步 ---------- */
.page-about .about-cta {
  padding-block: clamp(2rem, 5vw, 3.4rem) 0;
  border-top: 1px solid var(--line);
}

.page-about .about-cta h2 {
  margin: 0 0 1.3rem;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 4vw, 2.3rem);
  line-height: 1.15;
  color: var(--paper);
}

.page-about .about-cta__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: .9rem;
}

.page-about .about-cta__card {
  display: block;
  padding: 1.15rem 1.2rem 1.3rem;
  border: var(--bd);
  background: rgba(10, 58, 51, .5);
  text-decoration: none;
  transition: border-color .3s var(--ease), transform .3s var(--ease), box-shadow .3s var(--ease), background-color .3s var(--ease);
}

.page-about .about-cta__card:hover,
.page-about .about-cta__card:focus-visible {
  border-color: var(--cyan);
  background: rgba(53, 240, 208, .08);
  transform: translate(-4px, -4px);
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__k {
  display: block;
  margin-bottom: .7rem;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .24em;
  color: var(--cyan);
}

.page-about .about-cta__card--flame .about-cta__k {
  color: var(--flame);
}

.page-about .about-cta__t {
  display: block;
  margin-bottom: .45rem;
  font-family: var(--font-head);
  font-size: 1.18rem;
  letter-spacing: .01em;
  color: var(--paper);
}

.page-about .about-cta__d {
  display: block;
  font-size: .88rem;
  line-height: 1.7;
  color: var(--mist);
}

/* ===========================================================
   响应式
   =========================================================== */

@media (min-width: 700px) {
  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__split {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .62fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .about-stat:nth-child(2) {
    margin-left: 1.7rem;
  }

  .page-about .about-stat:nth-child(3) {
    margin-left: .7rem;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1fr) minmax(0, .85fr);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 178px minmax(0, 1fr);
    gap: clamp(2.4rem, 5vw, 4.6rem);
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 1.6rem);
  }

  .page-about .about-toc__list {
    display: block;
  }

  .page-about .about-toc__link {
    padding-left: .8rem;
  }

  .page-about .about-toc__link[aria-current="true"] {
    border-left-color: var(--flame);
  }
}

@media (min-width: 1140px) {
  .page-about .about-sec {
    padding-right: 2.8rem;
  }

  .page-about .about-vert {
    display: block;
    position: absolute;
    top: clamp(3rem, 7vw, 5.2rem);
    right: var(--gutter);
    margin: 0;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-mono);
    font-size: .7rem;
    letter-spacing: .3em;
    text-transform: uppercase;
    color: var(--mist);
    opacity: .7;
  }
}

@media (min-width: 1280px) {
  .page-about .about-rules {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}