/* =========================================================
   品牌总览 /overview/
   非对称编辑部版式 · 斜向版本时间轴 · 数据标签牌
   ========================================================= */

.page-about {
  --about-card: rgba(11, 58, 44, 0.62);
  --about-edge: rgba(47, 243, 200, 0.18);
  --about-soft: rgba(243, 248, 245, 0.74);
  --about-gap: clamp(52px, 7.6vw, 104px);
  background: var(--night);
  color: var(--bone);
  overflow-x: clip;
}

.page-about > section {
  position: relative;
  padding-block: var(--about-gap);
}

.page-about h2 {
  font-family: var(--ff-display);
  font-size: clamp(1.6rem, 3.6vw, 2.5rem);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: -0.014em;
  color: var(--bone);
  margin: 14px 0 clamp(18px, 2.6vw, 30px);
  max-width: 22em;
}

.page-about h3 {
  font-family: var(--ff-display);
  color: var(--bone);
  letter-spacing: -0.008em;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: calc(var(--head-h) + clamp(30px, 6vw, 78px)) clamp(52px, 7.4vw, 104px);
  background:
    radial-gradient(130% 96% at 84% -14%, rgba(47, 243, 200, 0.20) 0%, rgba(47, 243, 200, 0) 58%),
    linear-gradient(158deg, var(--ink) 0%, var(--night) 44%, var(--turf) 100%);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: clamp(-140px, -9vw, -60px);
  top: 10%;
  width: clamp(200px, 32vw, 440px);
  aspect-ratio: 1 / 1;
  border: 1px solid var(--about-edge);
  background: linear-gradient(140deg, rgba(255, 90, 46, 0.12), rgba(47, 243, 200, 0.05));
  clip-path: polygon(24% 0, 100% 0, 100% 76%, 76% 100%, 0 100%, 0 24%);
  opacity: 0.7;
  pointer-events: none;
  z-index: -1;
}

.page-about .about-hero .crumbs {
  margin-bottom: clamp(26px, 4vw, 48px);
}

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

.page-about .about-hero h1 {
  font-family: var(--ff-display);
  font-size: clamp(2.1rem, 6.2vw, 4.4rem);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.022em;
  color: var(--bone);
  margin: clamp(14px, 1.8vw, 26px) 0 0;
  max-width: 20em;
}

.page-about .about-hero__brand {
  color: var(--cyan);
}

.page-about .about-hero__lede {
  margin: clamp(20px, 2.6vw, 32px) 0 0;
  max-width: 60ch;
  font-size: var(--fs-lead);
  line-height: 1.85;
  color: rgba(243, 248, 245, 0.82);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin-top: clamp(32px, 4.4vw, 56px);
  max-width: 760px;
  border-top: 1px solid var(--about-edge);
  border-left: 1px solid var(--about-edge);
}

.page-about .about-hero__facts .k-stat {
  padding: clamp(14px, 1.9vw, 22px) clamp(12px, 1.6vw, 20px);
  border-right: 1px solid var(--about-edge);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-hero__facts .k-stat__num {
  display: block;
  font-family: var(--ff-mono);
  font-size: clamp(1.5rem, 2.6vw, 2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-hero__facts .k-stat__num em {
  font-style: normal;
  font-size: 0.6em;
  letter-spacing: 0;
}

.page-about .about-hero__facts .k-stat__key {
  display: block;
  margin-top: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

/* ---------- 起点 ---------- */
.page-about .about-start {
  background: linear-gradient(180deg, rgba(5, 35, 27, 0) 0%, rgba(11, 58, 44, 0.34) 55%, rgba(5, 35, 27, 0) 100%);
}

.page-about .about-start .k-grid {
  align-items: start;
}

.page-about .about-toc {
  counter-reset: toc;
  padding: clamp(20px, 2.6vw, 28px);
  background: var(--about-card);
  border: 1px solid var(--about-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
}

.page-about .about-toc ol {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
}

.page-about .about-toc li {
  counter-increment: toc;
}

.page-about .about-toc a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 10px 2px;
  font-size: 0.9375rem;
  color: rgba(243, 248, 245, 0.78);
  text-decoration: none;
  border-bottom: 1px solid var(--hair-soft);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-toc a::before {
  content: counter(toc, decimal-leading-zero);
  flex: none;
  font-family: var(--ff-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-toc a:last-child {
  border-bottom: 0;
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--hair-strong);
}

.page-about .about-start__figure {
  margin: clamp(36px, 5vw, 64px) 0 0;
  border: 1px solid var(--about-edge);
}

/* ---------- 版本演进 ---------- */
.page-about .about-timeline {
  background:
    linear-gradient(180deg, rgba(5, 35, 27, 0) 0%, rgba(42, 42, 102, 0.32) 26%, rgba(42, 42, 102, 0.32) 74%, rgba(5, 35, 27, 0) 100%);
}

.page-about .about-timeline__lede {
  margin: 0;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-soft);
}

.page-about .about-timeline__stage {
  position: relative;
  margin-top: clamp(34px, 5vw, 68px);
}

.page-about .about-timeline__rail {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  display: none;
  pointer-events: none;
}

.page-about .about-timeline__list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-timeline__item {
  position: relative;
  padding: clamp(18px, 2.2vw, 24px) clamp(16px, 2vw, 22px);
  background: rgba(11, 58, 44, 0.68);
  border: 1px solid var(--about-edge);
  border-left: 2px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
  transition: transform 0.25s ease, background 0.25s ease;
}

.page-about .about-timeline__item:hover {
  transform: translateY(-3px);
  background: rgba(11, 58, 44, 0.9);
}

.page-about .about-timeline__dot {
  position: absolute;
  top: 0;
  right: 0;
  width: 10px;
  height: 10px;
  background: var(--amber);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

.page-about .about-timeline__ver {
  margin: 0 0 8px;
  font-family: var(--ff-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--amber);
}

.page-about .about-timeline__item h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  line-height: 1.36;
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: rgba(243, 248, 245, 0.68);
}

/* ---------- 三条业务线 ---------- */
.page-about .about-lines__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.4vw, 28px);
  margin-top: clamp(28px, 4vw, 50px);
}

.page-about .about-line {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: clamp(22px, 2.6vw, 30px);
}

.page-about .about-line__no {
  align-self: flex-start;
  margin: 0;
  padding-bottom: 8px;
  font-family: var(--ff-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-line h3 {
  margin: 0;
  font-size: clamp(1.125rem, 1.5vw, 1.375rem);
  line-height: 1.32;
}

.page-about .about-line__lede {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: rgba(243, 248, 245, 0.74);
}

.page-about .about-line__list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .about-line__list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(243, 248, 245, 0.6);
}

.page-about .about-line__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.65em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 内容维护 ---------- */
.page-about .about-team__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(26px, 3.4vw, 40px);
  background: var(--about-edge);
  border: 1px solid var(--about-edge);
}

.page-about .about-team__stats .k-stat {
  padding: clamp(14px, 1.9vw, 22px);
  background: var(--night);
}

.page-about .about-team__stats .k-stat__num {
  display: block;
  font-family: var(--ff-mono);
  font-size: clamp(1.375rem, 2.2vw, 1.75rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .about-team__stats .k-stat__key {
  display: block;
  margin-top: 7px;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-team__figure {
  margin: 0 0 clamp(18px, 2.4vw, 26px);
  border: 1px solid var(--about-edge);
}

.page-about .about-team .k-note {
  margin: 0;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners__panel {
  display: grid;
  gap: clamp(26px, 3.6vw, 48px);
  padding: clamp(26px, 3.6vw, 52px);
}

.page-about .about-partners h2 {
  color: var(--bone);
}

.page-about .about-partners__link {
  margin-top: clamp(20px, 2.6vw, 30px);
}

.page-about .about-partners__figure {
  margin: 0;
  border: 1px solid rgba(255, 201, 74, 0.28);
}

/* ---------- 平台数据 ---------- */
.page-about .about-numbers {
  background: radial-gradient(84% 70% at 50% 40%, rgba(11, 58, 44, 0.6), rgba(5, 35, 27, 0) 72%);
}

.page-about .about-numbers__grid {
  list-style: none;
  margin: clamp(28px, 4vw, 50px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-edge);
  border: 1px solid var(--about-edge);
}

.page-about .about-numbers__cell {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 2.8vw, 34px);
  background: linear-gradient(160deg, rgba(11, 58, 44, 0.92), rgba(5, 35, 27, 0.96));
}

.page-about .about-numbers__cell .k-stat__num {
  align-self: flex-start;
  display: inline-flex;
  align-items: baseline;
  gap: 2px;
  padding-bottom: 10px;
  font-family: var(--ff-mono);
  font-size: clamp(1.75rem, 3.6vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  border-bottom: 2px solid rgba(47, 243, 200, 0.5);
}

.page-about .about-numbers__cell .k-stat__num em {
  font-style: normal;
  font-size: 0.54em;
  letter-spacing: 0;
}

.page-about .about-numbers__cell .k-stat__key {
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-numbers__foot {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(243, 248, 245, 0.66);
}

/* ---------- 下一步 ---------- */
.page-about .about-cta__inner {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  padding: clamp(26px, 3.6vw, 46px);
  background:
    linear-gradient(120deg, rgba(255, 90, 46, 0.18), rgba(47, 243, 200, 0.08)),
    var(--turf);
  border: 1px solid var(--about-edge);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}

.page-about .about-cta__lead {
  margin: 12px 0 0;
  max-width: 34em;
  font-family: var(--ff-display);
  font-size: clamp(1.0625rem, 1.7vw, 1.375rem);
  line-height: 1.55;
  color: var(--bone);
}

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

/* ---------- 响应式 ---------- */
@media (max-width: 899px) {
  .page-about .k-grid > .k-col--main,
  .page-about .k-grid > .k-col--aside {
    grid-column: 1 / -1;
  }
  .page-about .k-col--aside {
    margin-top: clamp(26px, 4vw, 40px);
  }
}

@media (min-width: 640px) {
  .page-about .about-team__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-lines__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .about-lines__grid > :nth-child(2) {
    margin-top: clamp(20px, 3vw, 44px);
  }
}

@media (min-width: 880px) {
  .page-about .about-timeline__rail {
    display: block;
  }
  .page-about .about-timeline__list {
    grid-auto-flow: column;
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: clamp(14px, 1.6vw, 22px);
    align-items: start;
  }
  .page-about .about-timeline__item:nth-child(1) { margin-top: 0; }
  .page-about .about-timeline__item:nth-child(2) { margin-top: 66px; }
  .page-about .about-timeline__item:nth-child(3) { margin-top: 132px; }
  .page-about .about-timeline__item:nth-child(4) { margin-top: 198px; }
  .page-about .about-timeline__item:nth-child(5) { margin-top: 264px; }
}

@media (min-width: 900px) {
  .page-about .about-partners__panel {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: center;
  }
}

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

@media (min-width: 820px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item {
    transition: none;
  }
  .page-about .about-timeline__item:hover {
    transform: none;
  }
}