/* ============================================================
   page-about · 平台介绍
   ============================================================ */

.page-about {
  --on-line: rgba(42, 58, 80, .9);
  --on-tint: rgba(217, 163, 74, .07);
  position: relative;
  overflow-x: hidden;
  font-family: var(--yw-head);
  background: var(--yw-paper);
  color: var(--yw-paper-ink);
}

.page-about .yw-section {
  padding: clamp(48px, 7vw, 92px) 0;
}

.page-about .yw-section--ink {
  background-color: var(--yw-ink);
  background-image:
    linear-gradient(var(--yw-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--yw-grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--yw-light);
  border-top: 1px solid var(--yw-rule);
  border-bottom: 1px solid var(--yw-rule);
}

.page-about .yw-section--paper {
  background-color: var(--yw-paper);
  background-image: radial-gradient(rgba(27, 36, 48, .035) 1px, transparent 1px);
  background-size: 20px 20px;
  color: var(--yw-paper-ink);
}

.page-about h1,
.page-about h2,
.page-about h3 {
  margin: 0;
  font-family: var(--yw-head);
  font-weight: 900;
  letter-spacing: -.01em;
}

.page-about h2 {
  margin-bottom: 20px;
  font-size: clamp(26px, 4vw, 42px);
  line-height: 1.22;
}

.page-about h3 {
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.4;
}

.page-about p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.85;
}

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

/* ---------- 展签式小节标签 ---------- */

.page-about .on-tag {
  display: inline-flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 18px;
  font-family: var(--yw-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--yw-gold-dark);
}

.page-about .on-tag__num {
  font-weight: 700;
  color: var(--yw-gold);
}

.page-about .yw-section--ink .on-tag {
  color: var(--yw-gold);
}

/* ---------- 首屏 ---------- */

.page-about .on-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(52px, 8vw, 100px);
  background-color: var(--yw-ink);
  background-image:
    linear-gradient(var(--yw-grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--yw-grid-line) 1px, transparent 1px);
  background-size: 56px 56px;
  color: var(--yw-light);
  overflow: hidden;
}

.page-about .on-hero::after {
  content: none;
}

@media (min-width: 1140px) {
  .page-about .on-hero::after {
    content: "";
    position: absolute;
    top: 0;
    right: clamp(16px, 4vw, 56px);
    bottom: 0;
    width: 1px;
    background-image: repeating-linear-gradient(to bottom, var(--yw-gold) 0 2px, transparent 2px 14px);
    opacity: .4;
    pointer-events: none;
  }
}

.page-about .on-hero__frame {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  margin-top: clamp(26px, 4vw, 52px);
  padding: 26px 20px 30px;
  border: 1px solid var(--yw-rule);
  border-radius: var(--yw-radius);
  background: rgba(5, 10, 18, .5);
  box-shadow: var(--yw-stack);
}

@media (min-width: 900px) {
  .page-about .on-hero__frame {
    grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr);
    gap: 48px;
    padding: 42px 38px 46px;
  }
}

.page-about .on-hero__kicker {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--yw-gold);
}

.page-about .on-hero__title {
  margin-bottom: 22px;
  font-size: clamp(34px, 6.6vw, 68px);
  line-height: 1.06;
  color: var(--yw-light);
}

.page-about .on-hero__title span {
  display: block;
}

.page-about .on-hero__title-accent {
  color: var(--yw-gold);
}

.page-about .on-hero__lede {
  max-width: 46ch;
  margin-bottom: 28px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--yw-slate);
}

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

.page-about .on-hero__panel {
  align-self: start;
  padding: 18px 16px 8px;
  border: 1px solid var(--yw-rule);
  border-radius: var(--yw-radius);
  background: rgba(11, 20, 36, .72);
}

.page-about .on-hero__panel-head {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--yw-cyan);
}

.page-about .on-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  column-gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .on-hero__stat {
  padding: 14px 0 16px;
  border-top: 1px solid var(--yw-rule);
}

.page-about .on-hero__stat-num {
  display: block;
  font-family: var(--yw-mono);
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--yw-gold);
}

.page-about .on-hero__stat-label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--yw-slate);
}

/* ---------- 品牌由来 ---------- */

.page-about .on-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
}

@media (min-width: 880px) {
  .page-about .on-origin__grid {
    grid-template-columns: 170px minmax(0, 1fr);
    gap: 40px;
  }
}

.page-about .on-origin__body {
  max-width: 700px;
}

.page-about .on-origin__quote {
  margin: 26px 0 0;
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--yw-gold);
  font-family: var(--yw-serif);
  font-size: clamp(18px, 2.2vw, 23px);
  font-weight: 600;
  line-height: 1.7;
  color: var(--yw-gold-dark);
}

/* ---------- 时间轴 ---------- */

.page-about .on-timeline__lede {
  max-width: 58ch;
  color: var(--yw-slate);
}

.page-about .on-timeline__figure {
  margin: 34px 0 0;
  border: 1px solid var(--yw-rule);
  border-radius: var(--yw-radius);
  background: var(--yw-ink-deep);
  overflow: hidden;
}

.page-about .on-timeline__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  opacity: .92;
}

.page-about .on-timeline__figure figcaption {
  padding: 12px 16px;
  border-top: 1px solid var(--yw-rule);
  font-family: var(--yw-mono);
  font-size: 12px;
  line-height: 1.6;
  color: var(--yw-slate);
}

.page-about .on-timeline__rail {
  display: flex;
  margin: 40px 0 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  border-top: 1px solid var(--yw-rule);
  scrollbar-width: thin;
}

.page-about .on-timeline__node {
  position: relative;
  flex: 1 0 190px;
  padding: 32px 20px 10px 0;
  border-right: 1px solid var(--yw-rule);
  transition: background-color 160ms var(--yw-ease);
}

.page-about .on-timeline__node:last-child {
  padding-right: 0;
  border-right: 0;
}

.page-about .on-timeline__node::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  background: var(--yw-gold);
  transform: rotate(45deg);
}

.page-about .on-timeline__node--current::before {
  border-radius: 50%;
  background: var(--yw-cyan);
  transform: none;
  box-shadow: 0 0 0 4px rgba(79, 227, 208, .16);
}

@media (hover: hover) {
  .page-about .on-timeline__node:hover {
    background-color: var(--on-tint);
  }
  .page-about .on-timeline__node:hover .on-timeline__stage {
    color: var(--yw-gold);
  }
}

.page-about .on-timeline__year {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 9px;
  border-radius: 2px;
  background: var(--yw-gold);
  color: var(--yw-ink);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .1em;
}

.page-about .on-timeline__stage {
  margin-bottom: 10px;
  font-size: 16px;
  font-weight: 700;
  color: var(--yw-light);
  transition: color 160ms var(--yw-ease);
}

.page-about .on-timeline__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--yw-slate);
}

/* ---------- 团队与分工 ---------- */

.page-about .on-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 34px;
}

@media (min-width: 900px) {
  .page-about .on-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 56px;
    align-items: start;
  }
}

.page-about .on-team__figure {
  margin: 0;
  border: 1px solid var(--yw-paper-2);
  border-radius: var(--yw-radius);
  background: var(--yw-paper-2);
  box-shadow: var(--yw-stack-deep);
  overflow: hidden;
}

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

.page-about .on-team__caption {
  display: block;
  padding: 10px 14px;
  font-size: 11.5px;
  letter-spacing: .06em;
  color: var(--yw-paper-ink);
  background: var(--yw-paper-2);
}

.page-about .on-team__lede {
  max-width: 54ch;
  color: rgba(27, 36, 48, .82);
}

.page-about .on-team__stack {
  margin-top: 26px;
  border-top: 1px solid var(--yw-paper-2);
}

.page-about .on-team__group {
  border-bottom: 1px solid var(--yw-paper-2);
  border-left: 2px solid transparent;
  transition: border-color 160ms var(--yw-ease), background-color 160ms var(--yw-ease);
}

.page-about .on-team__group[open] {
  border-left-color: var(--yw-gold);
  background-color: rgba(217, 163, 74, .06);
}

@media (hover: hover) {
  .page-about .on-team__group:hover {
    background-color: rgba(217, 163, 74, .05);
  }
}

.page-about .on-team__summary {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 14px 16px 16px;
  cursor: pointer;
  list-style: none;
}

.page-about .on-team__summary::-webkit-details-marker {
  display: none;
}

.page-about .on-team__summary::marker {
  content: "";
}

.page-about .on-team__name {
  font-size: 16px;
  font-weight: 700;
  color: var(--yw-paper-ink);
}

.page-about .on-team__count {
  flex: none;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--yw-gold-dark);
}

.page-about .on-team__duty {
  margin: 0;
  padding: 0 16px 18px;
  font-size: 14.8px;
  line-height: 1.8;
  color: rgba(27, 36, 48, .78);
}

/* ---------- 服务能力与覆盖 ---------- */

.page-about .on-reach__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 940px) {
  .page-about .on-reach__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr);
    gap: 56px;
    align-items: start;
  }
}

.page-about .on-reach__lede {
  max-width: 56ch;
  color: var(--yw-slate);
}

.page-about .on-reach__services {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--yw-rule);
}

.page-about .on-reach__service {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 14px;
  padding: 14px 0;
  border-bottom: 1px solid var(--yw-rule);
  transition: background-color 160ms var(--yw-ease);
}

@media (min-width: 620px) {
  .page-about .on-reach__service {
    grid-template-columns: 34px minmax(0, auto) minmax(0, 1fr);
    gap: 14px;
  }
}

@media (hover: hover) {
  .page-about .on-reach__service:hover {
    background-color: var(--on-tint);
  }
}

.page-about .on-reach__service-idx {
  font-size: 12px;
  color: var(--yw-cyan);
}

.page-about .on-reach__service-name {
  font-size: 15.5px;
  font-weight: 700;
  color: var(--yw-light);
}

.page-about .on-reach__service-note {
  grid-column: 2;
  font-size: 14px;
  line-height: 1.65;
  color: var(--yw-slate);
}

@media (min-width: 620px) {
  .page-about .on-reach__service-note {
    grid-column: auto;
  }
}

.page-about .on-reach__foot {
  margin-top: 22px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--yw-slate);
}

.page-about .on-reach__link {
  color: var(--yw-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(79, 227, 208, .45);
  transition: border-color 160ms var(--yw-ease), color 160ms var(--yw-ease);
}

@media (hover: hover) {
  .page-about .on-reach__link:hover {
    color: var(--yw-gold);
    border-color: var(--yw-gold);
  }
}

.page-about .on-reach__figure {
  margin: 0;
  border: 1px solid var(--yw-rule);
  border-radius: var(--yw-radius);
  overflow: hidden;
}

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

.page-about .on-reach__figures {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 22px 0 0;
  border: 1px solid var(--yw-rule);
  border-radius: var(--yw-radius);
  background: var(--yw-rule);
  overflow: hidden;
}

.page-about .on-reach__figure-item {
  padding: 16px 12px;
  background: var(--yw-ink-deep);
}

.page-about .on-reach__figures dt {
  font-size: 12px;
  line-height: 1.5;
  color: var(--yw-slate);
}

.page-about .on-reach__figures dd {
  margin: 6px 0 0;
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 700;
  color: var(--yw-gold);
}

/* ---------- 协作与行业记录 ---------- */

.page-about .on-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 22px;
  margin-top: 28px;
}

@media (min-width: 820px) {
  .page-about .on-eco__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .75fr);
    gap: 32px;
  }
}

.page-about .on-eco__block {
  padding: 24px 20px;
  border: 1px solid var(--yw-paper-2);
  border-radius: var(--yw-radius);
  background: rgba(255, 255, 255, .42);
  box-shadow: var(--yw-stack-deep);
}

.page-about .on-eco__sub {
  margin-bottom: 12px;
  font-family: var(--yw-serif);
  font-size: 17px;
  font-weight: 600;
  color: var(--yw-paper-ink);
}

.page-about .on-eco__block p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(27, 36, 48, .8);
}

.page-about .on-eco__list,
.page-about .on-eco__awards {
  margin: 6px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .on-eco__list li,
.page-about .on-eco__awards li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 0;
  border-top: 1px solid var(--yw-paper-2);
  font-size: 15px;
  line-height: 1.7;
  color: var(--yw-paper-ink);
}

.page-about .on-eco__year {
  flex: none;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--yw-gold-dark);
  white-space: nowrap;
}

/* ---------- 日常节奏 ---------- */

.page-about .on-cadence__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

@media (min-width: 900px) {
  .page-about .on-cadence__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.2fr);
    gap: 56px;
    align-items: start;
  }
}

.page-about .on-cadence__lede {
  max-width: 52ch;
  color: var(--yw-slate);
}

.page-about .on-cadence__beats {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--yw-rule);
}

.page-about .on-cadence__beat {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 20px 0 20px 20px;
  border-bottom: 1px solid var(--yw-rule);
}

.page-about .on-cadence__beat::before {
  content: "";
  position: absolute;
  top: 29px;
  left: 0;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--yw-cyan);
  box-shadow: 0 0 0 3px rgba(79, 227, 208, .14);
}

.page-about .on-cadence__beat-cycle {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--yw-cyan);
}

.page-about .on-cadence__beat-name {
  font-size: 17px;
  font-weight: 700;
  color: var(--yw-light);
}

.page-about .on-cadence__beat-note {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--yw-slate);
}

.page-about .on-cadence__link {
  color: var(--yw-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 163, 74, .5);
  transition: border-color 160ms var(--yw-ease);
}

@media (hover: hover) {
  .page-about .on-cadence__link:hover {
    border-color: var(--yw-cyan);
    color: var(--yw-cyan);
  }
}

/* ---------- 下一步 ---------- */

.page-about .on-next {
  padding: clamp(48px, 7vw, 88px) 0;
  background: var(--yw-paper);
}

.page-about .on-next__title {
  margin-bottom: 0;
}

.page-about .on-next__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 28px;
}

@media (min-width: 760px) {
  .page-about .on-next__grid {
    grid-template-columns: 1.5fr 1fr;
    gap: 16px;
  }
}

.page-about .on-next__card {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 24px 22px;
  border: 1px solid var(--yw-paper-2);
  border-radius: var(--yw-radius);
  background: rgba(255, 255, 255, .55);
  box-shadow: var(--yw-stack-deep);
  color: inherit;
  text-decoration: none;
  transition: border-color 160ms var(--yw-ease), transform 160ms var(--yw-ease);
}

@media (hover: hover) {
  .page-about .on-next__card:hover {
    border-color: var(--yw-gold);
    transform: translate(-2px, -2px);
  }
}

.page-about .on-next__card-num {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--yw-gold-dark);
}

.page-about .on-next__card-name {
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--yw-paper-ink);
}

.page-about .on-next__card-note {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(27, 36, 48, .72);
}

/* ---------- 窄屏收口 ---------- */

@media (max-width: 480px) {
  .page-about .on-hero__frame {
    padding: 22px 16px 26px;
  }

  .page-about .on-hero__stats {
    grid-template-columns: 1fr;
  }

  .page-about .on-hero__stat {
    padding: 12px 0;
  }

  .page-about .on-timeline__node {
    flex-basis: 168px;
    min-width: 168px;
    padding-right: 16px;
  }

  .page-about .on-reach__figures {
    grid-template-columns: 1fr;
  }

  .page-about .on-eco__list li,
  .page-about .on-eco__awards li {
    flex-direction: column;
    gap: 4px;
  }
}