/* ==========================================================
   品牌故事 /story/ —— 页面专属样式（作用域 .page-about）
   ========================================================== */

.page-about {
  --about-rail: 88px;
  --about-gap: clamp(24px, 4vw, 56px);
  --about-ink: rgba(244, 247, 255, 0.8);
  position: relative;
  overflow-x: clip;
  background: var(--space-900);
  color: var(--paper-white);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(44px, 8vw, 104px) clamp(36px, 6vw, 76px);
  border-bottom: 2px solid var(--line);
  background:
    radial-gradient(115% 85% at 8% -10%, rgba(46, 74, 120, 0.62), transparent 60%),
    radial-gradient(80% 70% at 92% 6%, rgba(198, 255, 62, 0.12), transparent 62%),
    linear-gradient(180deg, #0A1730 0%, #142A4C 62%, #0A1730 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(46, 74, 120, 0.34) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 74, 120, 0.34) 1px, transparent 1px);
  background-size: 80px 80px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0) 82%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.75), rgba(0, 0, 0, 0) 82%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  isolation: isolate;
}

.page-about .about-hero__shadow {
  position: absolute;
  z-index: -1;
  top: clamp(-52px, -5vw, -18px);
  right: -0.05em;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(104px, 21vw, 288px);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 2px rgba(46, 74, 120, 0.72);
  pointer-events: none;
  user-select: none;
}

.page-about .about-hero__crumbs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-hero__crumbs a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-hero__crumbs a:hover,
.page-about .about-hero__crumbs a:focus-visible {
  color: var(--lime);
}

.page-about .about-hero__crumbs [aria-current="page"] {
  color: var(--paper-white);
}

.page-about .about-hero__eyebrow {
  margin-top: clamp(22px, 4vw, 44px);
  color: var(--lime);
}

.page-about .about-hero__title {
  max-width: 18ch;
  margin: 14px 0 0;
  color: var(--paper-white);
}

.page-about .about-hero__lead {
  max-width: 60ch;
  margin: clamp(18px, 3vw, 28px) 0 0;
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.85;
  color: rgba(244, 247, 255, 0.82);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: clamp(30px, 5vw, 52px) 0 0;
  padding: 2px;
  list-style: none;
  border: 2px solid var(--line);
  border-radius: var(--card-radius);
  background: var(--line);
  box-shadow: var(--shadow-hard);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  background: var(--midnight);
}

.page-about .about-fact__value {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

/* ---------- 时间轴主脊 ---------- */

.page-about .about-spine {
  position: relative;
  padding-block: clamp(36px, 6vw, 76px);
  background:
    radial-gradient(90% 50% at 76% 0%, rgba(20, 42, 76, 0.85), transparent 68%),
    var(--space-900);
}

.page-about .about-spine--tail {
  background:
    radial-gradient(80% 60% at 14% 100%, rgba(46, 74, 120, 0.42), transparent 70%),
    var(--space-900);
}

.page-about .about-spine__inner {
  position: relative;
}

.page-about .about-chapter {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding-block: clamp(32px, 5vw, 56px);
}

.page-about .about-chapter__marker {
  position: relative;
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-chapter__dot {
  flex: none;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  border: 2px solid var(--lime);
  background: var(--space-900);
  box-shadow: 0 0 0 4px rgba(198, 255, 62, 0.14);
}

.page-about .about-chapter__index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-chapter__body {
  max-width: 68ch;
}

.page-about .about-chapter__title {
  margin: 12px 0 clamp(16px, 2.5vw, 24px);
  color: var(--paper-white);
}

.page-about .about-chapter__body .prose {
  margin: 0 0 18px;
  color: var(--about-ink);
}

.page-about .about-chapter__body > .about-media {
  margin-block: clamp(20px, 3vw, 30px);
}

/* ---------- 旁注 ---------- */

.page-about .aside-note {
  max-width: 56ch;
  margin-top: clamp(18px, 3vw, 26px);
  padding: 0 18px;
  border: 2px solid var(--line);
  border-left: 6px solid var(--lime);
  border-radius: 0 var(--card-radius) var(--card-radius) 0;
  background: rgba(20, 42, 76, 0.72);
}

.page-about .aside-note > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding-block: 14px;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime);
}

.page-about .aside-note > summary::-webkit-details-marker {
  display: none;
}

.page-about .aside-note > summary::after {
  content: "+";
  font-size: 16px;
  line-height: 1;
}

.page-about .aside-note[open] > summary::after {
  content: "−";
}

.page-about .aside-note > p {
  margin: 0;
  padding-bottom: 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink);
}

/* ---------- 年份节点 ---------- */

.page-about .about-nodes {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-node {
  position: relative;
  border: 2px solid var(--line);
  border-radius: var(--card-radius);
  background: linear-gradient(160deg, var(--midnight), rgba(10, 23, 48, 0.88));
  box-shadow: var(--shadow-hard);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .about-node:hover,
.page-about .about-node[open] {
  border-color: var(--lime);
  transform: translate(2px, -2px);
  box-shadow: var(--shadow-hard-lg);
}

.page-about .about-node__summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__year {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--amber);
  font-variant-numeric: tabular-nums;
}

.page-about .about-node__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 2.2vw, 20px);
  line-height: 1.45;
  color: var(--paper-white);
}

.page-about .about-node__body {
  margin: 0 20px 20px;
  padding-top: 14px;
  border-top: 1px dashed rgba(46, 74, 120, 0.9);
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-ink);
}

.page-about .about-node__body p {
  margin: 0;
}

/* ---------- 团队 ---------- */

.page-about .about-crew {
  display: grid;
  gap: 14px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .about-crew__card {
  padding: clamp(18px, 2.5vw, 26px);
  border: 2px solid var(--line);
  border-radius: var(--card-radius);
  background: linear-gradient(165deg, var(--midnight), rgba(10, 23, 48, 0.92));
  box-shadow: var(--shadow-hard);
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .about-crew__card:hover {
  transform: translateY(-4px);
  border-color: var(--lime);
  box-shadow: var(--shadow-hard-lg);
}

.page-about .about-crew__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--amber);
}

.page-about .about-crew__card h3 {
  margin: 10px 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.3vw, 21px);
  line-height: 1.4;
  color: var(--paper-white);
}

.page-about .about-crew__card p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-ink);
}

/* ---------- 媒体块 ---------- */

.page-about .about-media {
  margin: 0;
  border: 2px solid var(--line);
  border-radius: var(--card-radius);
  overflow: hidden;
  background: var(--midnight);
  box-shadow: var(--shadow-hard);
}

.page-about .about-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.page-about .about-media--tall img {
  aspect-ratio: 3 / 2;
}

.page-about .about-media figcaption {
  padding: 11px 16px;
  border-top: 2px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11.5px;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 案例合集（浅色区） ---------- */

.page-about .about-cases {
  position: relative;
  padding-block: clamp(32px, 5vw, 64px);
  border-top: 2px solid var(--line);
  border-bottom: 2px solid var(--line);
  background:
    linear-gradient(180deg, rgba(230, 235, 244, 0.96), rgba(244, 247, 255, 1));
  color: var(--space-900);
}

.page-about .about-cases .about-chapter {
  padding-block: clamp(16px, 3vw, 28px);
}

.page-about .about-cases__eyebrow {
  color: var(--line);
}

.page-about .about-cases__title {
  margin: 12px 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 5.4vw, 62px);
  color: var(--space-900);
}

.page-about .about-cases__lead {
  max-width: 62ch;
  margin: clamp(14px, 2vw, 20px) 0 0;
  font-size: clamp(15.5px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(10, 23, 48, 0.78);
}

.page-about .about-cases__grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(22px, 4vw, 34px);
}

.page-about .about-cases__list {
  display: grid;
  align-content: start;
}

.page-about .about-cases .about-media {
  border-color: var(--space-900);
  background: var(--paper-white);
  box-shadow: 4px 4px 0 rgba(13, 17, 23, 0.28);
}

.page-about .about-cases .about-media figcaption {
  border-top-color: var(--space-900);
  color: rgba(10, 23, 48, 0.7);
}

.page-about .about-case {
  margin-bottom: 14px;
  border: 2px solid var(--space-900);
  border-radius: var(--card-radius);
  background: var(--paper-white);
  box-shadow: 4px 4px 0 rgba(13, 17, 23, 0.16);
  transition: box-shadow 0.24s var(--ease), transform 0.24s var(--ease);
}

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

.page-about .about-case:hover,
.page-about .about-case[open] {
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(10, 23, 48, 0.85);
}

.page-about .about-case > summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

.page-about .about-case > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-case__tag {
  padding: 4px 10px;
  border-radius: var(--pill);
  background: var(--space-900);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
}

.page-about .about-case__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(15.5px, 1.9vw, 17px);
  color: var(--space-900);
}

.page-about .about-case > p {
  margin: 0;
  padding: 0 18px 18px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(10, 23, 48, 0.78);
}

.page-about .about-cases .about-chapter__dot {
  border-color: var(--space-900);
  background: var(--paper-white);
  box-shadow: 0 0 0 4px rgba(10, 23, 48, 0.1);
}

.page-about .about-cases .about-chapter__index {
  color: var(--line);
}

/* ---------- 协作区错位图文 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
  margin-top: clamp(14px, 2vw, 20px);
}

/* ---------- 长期标准 ---------- */

.page-about .about-standards {
  counter-reset: std;
  display: grid;
  gap: 0;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0 0 0 clamp(16px, 3vw, 26px);
  list-style: none;
  border-left: 2px solid var(--line);
}

.page-about .about-standards > li {
  padding-block: clamp(16px, 2.4vw, 22px);
  border-bottom: 1px dashed rgba(46, 74, 120, 0.7);
}

.page-about .about-standards > li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-standards h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.2vw, 20px);
  line-height: 1.4;
  color: var(--paper-white);
}

.page-about .about-standards h3::before {
  counter-increment: std;
  content: counter(std, decimal-leading-zero);
  display: inline-block;
  margin-right: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-standards p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-ink);
}

/* ---------- 页尾编号索引 ---------- */

.page-about .about-next {
  margin-top: clamp(30px, 5vw, 56px);
  padding-top: clamp(24px, 4vw, 38px);
  border-top: 2px solid var(--line);
}

.page-about .about-next__list {
  display: grid;
  gap: 14px;
  margin-top: 16px;
  padding: 0;
  list-style: none;
}

.page-about .about-next__list .index-item {
  margin: 0;
}

.page-about .about-next__list a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  height: 100%;
  padding: 18px;
  border: 2px solid var(--line);
  border-radius: var(--card-radius);
  background: rgba(20, 42, 76, 0.6);
  color: var(--paper-white);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(16px, 2vw, 18px);
  text-decoration: none;
  transition: transform 0.24s var(--ease), border-color 0.24s var(--ease), background-color 0.24s var(--ease);
}

.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  border-color: var(--lime);
  transform: translateY(-3px);
  background: rgba(20, 42, 76, 0.95);
}

.page-about .about-next__list a span {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 回到顶部浮标 ---------- */

.page-about .about-top {
  position: fixed;
  right: clamp(14px, 3vw, 28px);
  bottom: clamp(14px, 3vw, 28px);
  z-index: 40;
  padding: 10px 16px;
  border: 2px solid var(--lime);
  border-radius: var(--pill);
  background: rgba(10, 23, 48, 0.92);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-decoration: none;
  transition: background-color 0.24s var(--ease), color 0.24s var(--ease);
}

.page-about .about-top:hover,
.page-about .about-top:focus-visible {
  background: var(--lime);
  color: var(--space-900);
}

/* ---------- 断点 ---------- */

@media (min-width: 760px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 2px;
  }

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

@media (min-width: 860px) {
  .page-about .about-cases__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    column-gap: var(--about-gap);
  }

  .page-about .about-chapter::before {
    content: "";
    position: absolute;
    left: 8px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, rgba(198, 255, 62, 0.8), rgba(46, 74, 120, 0.45) 20%, rgba(46, 74, 120, 0.18));
  }

  .page-about .about-chapter__marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding-top: 6px;
  }

  .page-about .about-cases .about-chapter::before {
    background: linear-gradient(180deg, rgba(10, 23, 48, 0.55), rgba(46, 74, 120, 0.28));
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__title {
    max-width: 100%;
  }

  .page-about .about-node__year {
    font-size: 24px;
  }

  .page-about .about-top {
    right: 12px;
    bottom: 12px;
    padding: 8px 13px;
    font-size: 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-node,
  .page-about .about-crew__card,
  .page-about .about-case,
  .page-about .about-next__list a,
  .page-about .about-top {
    transition: none;
  }

  .page-about .about-node:hover,
  .page-about .about-node[open],
  .page-about .about-crew__card:hover,
  .page-about .about-case:hover,
  .page-about .about-case[open],
  .page-about .about-next__list a:hover {
    transform: none;
  }
}