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

.page-about .about-band {
  padding: clamp(52px, 7vw, 104px) 0;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding: 14px 0 12px;
}

.page-about .about-crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crumb .breadcrumb__item {
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--slate);
}

.page-about .about-crumb .breadcrumb__item + .breadcrumb__item {
  margin-left: 10px;
}

.page-about .about-crumb .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 10px;
  color: var(--mist);
}

.page-about .about-crumb .breadcrumb__link {
  color: var(--ink);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-crumb .breadcrumb__link:hover,
.page-about .about-crumb .breadcrumb__link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(34px, 5vw, 62px) 0 clamp(48px, 6vw, 86px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(0, 229, 204, .07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(0, 229, 204, .07) 1px, transparent 1px);
  background-size: 76px 76px;
  -webkit-mask-image: radial-gradient(120% 90% at 18% 12%, #000 0%, transparent 78%);
  mask-image: radial-gradient(120% 90% at 18% 12%, #000 0%, transparent 78%);
  pointer-events: none;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero .label {
  color: var(--cyan);
  letter-spacing: .16em;
}

.page-about .about-hero__head {
  max-width: 940px;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-sans);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 82px);
  line-height: 1.06;
  letter-spacing: -.01em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 58ch;
  font-size: clamp(16px, 1.5vw, 19px);
  line-height: 1.85;
  color: rgba(244, 241, 234, .84);
}

.page-about .about-hero__actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__actions .btn--outline {
  color: var(--paper);
  border-color: rgba(244, 241, 234, .55);
}

.page-about .about-hero__actions .btn--outline:hover,
.page-about .about-hero__actions .btn--outline:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-hero__figure {
  margin: clamp(32px, 5vw, 60px) 0 0;
}

.page-about .about-hero__figure .figure__media {
  display: block;
  width: 100%;
  height: auto;
  border: var(--rule) solid rgba(0, 229, 204, .55);
  box-shadow: 12px 12px 0 rgba(0, 229, 204, .14);
}

.page-about .about-hero__figure .figure__cap {
  margin-top: 14px;
  font-size: 14px;
  letter-spacing: .02em;
  color: rgba(244, 241, 234, .68);
}

/* ---------- 通用图片 ---------- */
.page-about .figure__media {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
}

.page-about .figure__cap {
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

/* ---------- 非对称网格 ---------- */
.page-about .about-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
}

@media (min-width: 980px) {
  .page-about .about-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 3fr);
  }
}

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

.page-about .about-grid__aside {
  min-width: 0;
  align-self: start;
}

/* ---------- 正文段落 ---------- */
.page-about .about-copy {
  margin-top: 26px;
  max-width: 68ch;
}

.page-about .about-copy p {
  margin: 0 0 20px;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-copy p:last-child {
  margin-bottom: 0;
}

/* ---------- 旁注卡 ---------- */
.page-about .about-note {
  border: var(--rule) solid var(--ink);
  background: var(--paper-2);
  padding: 22px 22px 24px;
  box-shadow: 8px 8px 0 rgba(27, 42, 74, .14);
}

.page-about .about-note__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-note p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-note p + p {
  margin-top: 12px;
}

/* ---------- 时间轴 ---------- */
.page-about .about-rail {
  position: relative;
  margin-top: clamp(34px, 4.5vw, 58px);
}

.page-about .about-rail__svg {
  display: none;
  position: absolute;
  left: 0;
  right: 0;
  top: 18px;
  width: 100%;
  height: 4px;
  overflow: visible;
}

.page-about .about-rail__svg line {
  stroke: var(--cyan);
  stroke-width: 2.5;
  stroke-dasharray: 7 7;
  opacity: .8;
}

.page-about .about-stages {
  position: relative;
  z-index: 1;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-stage {
  position: relative;
  padding: 24px 0 24px 34px;
  border-left: 2px solid var(--mist);
}

.page-about .about-stage:last-child {
  border-left-color: transparent;
}

.page-about .about-stage__dot {
  position: absolute;
  left: -13px;
  top: 30px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--mist);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 5px rgba(0, 229, 204, .16);
  transition: background-color .3s var(--ease), box-shadow .3s var(--ease);
}

.page-about .about-stage:hover .about-stage__dot,
.page-about .about-stage:focus-within .about-stage__dot {
  background: var(--cyan);
  box-shadow: 0 0 0 10px rgba(0, 229, 204, .24);
}

.page-about .about-stage__year {
  display: block;
  font-size: clamp(26px, 3vw, 38px);
  line-height: 1.05;
  letter-spacing: .04em;
  color: var(--signal);
}

.page-about .about-stage__title {
  margin: 10px 0 0;
  font-size: 19px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-stage__body {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--slate);
}

@media (min-width: 900px) {
  .page-about .about-rail__svg {
    display: block;
  }

  .page-about .about-stages {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(18px, 2.6vw, 34px);
  }

  .page-about .about-stage {
    padding: 58px 0 0 0;
    border-left: 0;
  }

  .page-about .about-stage__dot {
    left: 0;
    top: 8px;
    width: 24px;
    height: 24px;
    background: var(--paper-2);
    box-shadow: 0 0 0 6px rgba(0, 229, 204, .16);
  }
}

.page-about .about-rail__figure {
  margin: clamp(36px, 5vw, 64px) 0 0;
}

/* ---------- 深色分区：团队与节奏 ---------- */
.page-about .about-chapter {
  min-width: 0;
}

.page-about .about-chapter__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: rgba(244, 241, 234, .82);
}

.page-about .band--deep .chapter-no,
.page-about .band--deep .section-head__title {
  color: var(--paper);
}

.page-about .about-crews {
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-crew {
  position: relative;
  padding: 20px 22px 22px;
  background: var(--ink);
  border: var(--rule) solid rgba(244, 241, 234, .22);
  border-left: 4px solid var(--signal);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, .3);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-crew:hover {
  transform: translate(-2px, -2px);
  border-color: rgba(0, 229, 204, .5);
  border-left-color: var(--cyan);
}

.page-about .about-crew__label {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-crew__title {
  margin: 6px 0 0;
  font-size: 20px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-crew__body {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 241, 234, .76);
}

.page-about .about-crews__figure {
  margin: 30px 0 0;
}

.page-about .about-crews__figure .figure__media {
  border: var(--rule) solid rgba(0, 229, 204, .4);
  box-shadow: 10px 10px 0 rgba(0, 229, 204, .1);
}

.page-about .about-crews__figure .figure__cap {
  margin-top: 12px;
  color: rgba(244, 241, 234, .62);
}

.page-about .band--deep .divider {
  margin: clamp(44px, 6vw, 76px) 0;
  border: 0;
  border-top: 1px solid rgba(244, 241, 234, .18);
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid rgba(244, 241, 234, .2);
}

.page-about .about-cadence__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 20px;
  padding: 15px 0;
  border-bottom: 1px solid rgba(244, 241, 234, .2);
}

.page-about .about-cadence__key {
  font-size: 16px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-cadence__val {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .05em;
  color: var(--cyan);
}

/* ---------- 粘性旁注 ---------- */
.page-about .about-aside-sticky {
  display: grid;
  gap: 22px;
}

@media (min-width: 980px) {
  .page-about .about-aside-sticky {
    position: sticky;
    top: 118px;
    align-self: start;
  }
}

.page-about .about-aside-sticky .toc {
  border: var(--rule) solid rgba(244, 241, 234, .22);
  background: var(--ink);
  padding: 20px 22px 22px;
  box-shadow: 8px 8px 0 rgba(0, 0, 0, .28);
}

.page-about .about-aside-sticky .toc__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--signal);
}

.page-about .about-aside-sticky .toc__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .about-aside-sticky .toc__link {
  display: block;
  padding: 7px 0 7px 14px;
  font-size: 14px;
  line-height: 1.6;
  color: rgba(244, 241, 234, .72);
  text-decoration: none;
  border-left: 2px solid rgba(244, 241, 234, .18);
  transition: color .2s var(--ease), border-color .2s var(--ease), background-color .2s var(--ease);
}

.page-about .about-aside-sticky .toc__link:hover,
.page-about .about-aside-sticky .toc__link:focus-visible {
  color: var(--paper);
  border-left-color: var(--cyan);
}

.page-about .about-aside-sticky .toc__link.is-active,
.page-about .about-aside-sticky .toc__link[aria-current] {
  color: var(--signal);
  border-left-color: var(--signal);
  background: rgba(255, 107, 53, .08);
}

.page-about .about-facts__title {
  margin: 0 0 14px;
  color: var(--cyan);
}

.page-about .about-facts__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 16px;
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  align-items: baseline;
  gap: 4px 14px;
  padding-top: 14px;
  border-top: 1px solid rgba(0, 229, 204, .28);
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: 26px;
  line-height: 1;
  letter-spacing: .04em;
  color: var(--signal);
}

.page-about .about-fact__txt {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(244, 241, 234, .74);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-coverage__lede {
  margin: 20px 0 0;
  max-width: 62ch;
  color: var(--ink);
}

.page-about .about-stats {
  margin-top: clamp(32px, 4vw, 52px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 3.4vw, 44px);
}

@media (min-width: 820px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-stat + .about-stat {
    border-left: 1px solid var(--mist);
    padding-left: clamp(20px, 2.6vw, 38px);
  }
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(44px, 5.6vw, 76px);
  line-height: .95;
  letter-spacing: .02em;
  color: var(--signal);
}

.page-about .about-stat__unit {
  display: block;
  margin-top: 10px;
  font-size: 13px;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-stat__body {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 长期可用 ---------- */
.page-about .band--ink .section-head__title,
.page-about .band--ink .chapter-no {
  color: var(--paper);
}

.page-about .about-reasons {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-reason {
  position: relative;
  padding: 4px 0 28px 30px;
  border-left: 1px solid rgba(0, 229, 204, .38);
}

.page-about .about-reason:last-child {
  padding-bottom: 4px;
  border-left-color: transparent;
}

.page-about .about-reason::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 22px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(0, 229, 204, .75);
}

.page-about .about-reason:last-child::before {
  background: var(--signal);
  box-shadow: 0 0 10px rgba(255, 107, 53, .7);
}

.page-about .about-reason__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .16em;
  color: var(--cyan);
}

.page-about .about-reason__title {
  margin: 8px 0 0;
  font-size: 21px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .about-reason__body {
  margin: 10px 0 0;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 241, 234, .78);
}

.page-about .about-why__foot {
  margin: clamp(30px, 4vw, 46px) 0 0;
  padding: 20px 24px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--paper);
  background: rgba(0, 229, 204, .08);
  border-left: 3px solid var(--cyan);
}

/* ---------- 下一站 ---------- */
.page-about .about-links {
  margin: clamp(30px, 4vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .about-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-links__item:first-child {
    grid-column: 1 / -1;
  }
}

.page-about .about-link {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 20px 24px 22px;
  text-decoration: none;
  background: var(--paper);
  border: var(--rule) solid var(--ink);
  box-shadow: 6px 6px 0 rgba(27, 42, 74, .16);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease), border-color .28s var(--ease);
}

.page-about .about-link::after {
  content: "→";
  position: absolute;
  right: 22px;
  bottom: 18px;
  font-size: 20px;
  color: var(--signal);
  transition: transform .28s var(--ease);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  transform: translate(-3px, -3px);
  border-color: var(--signal);
  box-shadow: 10px 10px 0 rgba(255, 107, 53, .22);
}

.page-about .about-link:hover::after,
.page-about .about-link:focus-visible::after {
  transform: translateX(4px);
}

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

.page-about .about-link__text {
  font-size: 20px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-link__hint {
  font-size: 14px;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-links__item:first-child .about-link {
  background: var(--ink);
  border-color: var(--cyan);
}

.page-about .about-links__item:first-child .about-link__mark {
  color: var(--cyan);
}

.page-about .about-links__item:first-child .about-link__text {
  color: var(--paper);
}

.page-about .about-links__item:first-child .about-link__hint {
  color: rgba(244, 241, 234, .7);
}