/* =========================================================
   品牌文化 /culture/ —— 页面专属样式（作用域 .page-about）
   ========================================================= */

.page-about {
  --about-muted: #B3C9C3;
  --about-muted-ink: #526A64;
  --about-edge: rgba(47, 227, 208, 0.24);
  --about-cut: 12px;
}

.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 26px);
}

/* ---------------- 首屏 ---------------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(30px, 5vw, 56px) 0 clamp(44px, 6vw, 84px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -150px;
  right: -110px;
  width: min(620px, 84vw);
  aspect-ratio: 1 / 1;
  background: radial-gradient(circle at 34% 34%, rgba(47, 227, 208, 0.2), rgba(47, 227, 208, 0) 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: 0;
  top: 62%;
  width: min(340px, 48vw);
  height: 2px;
  background: linear-gradient(90deg, rgba(255, 122, 41, 0.9), rgba(255, 122, 41, 0));
  transform: rotate(-8deg);
  transform-origin: left center;
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
}

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

.page-about .about-hero .eyebrow {
  margin: 0;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  max-width: 15ch;
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -0.035em;
  color: var(--c-fog);
}

.page-about .about-hero .lede {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 44ch;
  font-size: var(--fs-md);
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-ledger {
  position: relative;
  padding: 22px 20px 18px;
  background: linear-gradient(158deg, rgba(18, 72, 61, 0.92), rgba(6, 37, 31, 0.92));
  border: 1px solid var(--about-edge);
  clip-path: polygon(0 0,
    calc(100% - 14px) 0,
    100% 14px,
    100% 100%,
    14px 100%,
    0 calc(100% - 14px));
}

.page-about .about-ledger__title {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--c-cyan-soft);
}

.page-about .about-ledger__list {
  margin: 12px 0 0;
}

.page-about .about-ledger__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 10px 0;
  border-bottom: 1px dashed rgba(169, 187, 182, 0.26);
}

.page-about .about-ledger__row:last-child {
  border-bottom: 0;
  padding-bottom: 4px;
}

.page-about .about-ledger__row dt {
  font-size: var(--fs-sm);
  color: var(--c-graphite);
}

.page-about .about-ledger__row dd {
  margin: 0;
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-cyan);
  white-space: nowrap;
}

/* ---------------- 章节通用头 ---------------- */

.page-about .about-timeline,
.page-about .about-team,
.page-about .about-catalog,
.page-about .about-eco,
.page-about .about-security,
.page-about .about-questions,
.page-about .about-why {
  position: relative;
  padding-block: clamp(48px, 7vw, 88px);
}

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

.page-about .about-head h2 {
  margin: 10px 0 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.025em;
}

.page-about .about-head__note {
  margin: 14px 0 0;
  font-size: var(--fs-md);
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .section--paper {
  color: var(--c-ink);
}

.page-about .section--paper .about-head__note {
  color: var(--about-muted-ink);
}

.page-about .section--paper .eyebrow {
  color: var(--c-mist);
}

/* ---------------- 版本拼贴图 ---------------- */

.page-about .about-versions {
  margin: clamp(26px, 4vw, 44px) 0 0;
}

.page-about .about-versions img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-edge);
  clip-path: polygon(0 0,
    calc(100% - 22px) 0,
    100% 22px,
    100% 100%,
    22px 100%,
    0 calc(100% - 22px));
}

.page-about .about-versions figcaption {
  margin-top: 12px;
  font-size: var(--fs-xs);
  line-height: 1.6;
  color: var(--about-muted);
}

/* ---------------- 阶段跳转 ---------------- */

.page-about .about-phases {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-phases a {
  display: inline-block;
  padding: 8px 14px;
  font-size: var(--fs-xs);
  letter-spacing: 0.05em;
  text-decoration: none;
  color: var(--c-cyan-soft);
  border: 1px solid var(--about-edge);
  transition: background var(--dur) var(--ease),
              color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
  clip-path: polygon(0 0,
    calc(100% - 9px) 0,
    100% 9px,
    100% 100%,
    9px 100%,
    0 calc(100% - 9px));
}

.page-about .about-phases a:hover,
.page-about .about-phases a:focus-visible {
  background: rgba(47, 227, 208, 0.14);
  color: var(--c-fog);
  transform: translateY(-2px);
}

/* ---------------- 纵向时间轴 ---------------- */

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

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg,
    var(--c-cyan) 0%,
    rgba(47, 227, 208, 0.3) 52%,
    rgba(255, 122, 41, 0.72) 100%);
}

.page-about .tl__item {
  position: relative;
  padding-bottom: clamp(30px, 4.4vw, 54px);
}

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

.page-about .tl__node {
  position: absolute;
  left: -27px;
  top: 5px;
  width: 12px;
  height: 12px;
  background: var(--c-ink);
  border: 2px solid var(--c-cyan);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.page-about .tl__item:hover .tl__node {
  background: var(--c-cyan);
  box-shadow: 0 0 0 5px rgba(47, 227, 208, 0.14);
}

.page-about .tl__item:last-child .tl__node {
  background: var(--c-orange);
  border-color: var(--c-orange);
  box-shadow: 0 0 0 6px rgba(255, 122, 41, 0.16);
}

.page-about .tl__item:last-child:hover .tl__node {
  background: var(--c-orange);
  box-shadow: 0 0 0 8px rgba(255, 122, 41, 0.22);
}

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

.page-about .tl__version {
  display: inline-block;
  margin: 0;
  padding: 5px 12px;
  font-size: var(--fs-xs);
  letter-spacing: 0.09em;
  color: var(--c-cyan-soft);
  border: 1px solid var(--about-edge);
  clip-path: polygon(0 0,
    calc(100% - 9px) 0,
    100% 9px,
    100% 100%,
    9px 100%,
    0 calc(100% - 9px));
}

.page-about .tl__body h3 {
  margin: 14px 0 0;
  font-size: var(--fs-h3);
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.02em;
}

.page-about .tl__desc {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: var(--fs-sm);
  line-height: 1.82;
  color: var(--about-muted);
}

.page-about .tl__facts {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
}

.page-about .tl__facts li {
  position: relative;
  padding-left: 20px;
  font-size: var(--fs-sm);
  line-height: 1.7;
  color: var(--about-muted);
}

.page-about .tl__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 10px;
  height: 1px;
  background: var(--c-cyan);
}

/* ---------------- 团队与分工 ---------------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 3.6vw, 40px);
  margin-top: clamp(28px, 4vw, 44px);
}

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

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0,
    calc(100% - 22px) 0,
    100% 22px,
    100% 100%,
    22px 100%,
    0 calc(100% - 22px));
}

.page-about .about-team__figure figcaption {
  margin-top: 12px;
  font-size: var(--fs-xs);
  line-height: 1.65;
  color: var(--about-muted-ink);
}

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

.page-about .about-role {
  padding: 16px 18px 18px;
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(6, 37, 31, 0.12);
  border-left: 3px solid var(--c-mist);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.page-about .about-role:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 26px rgba(6, 37, 31, 0.1);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0;
}

.page-about .about-role__name {
  font-size: var(--fs-md);
  font-weight: 800;
  letter-spacing: -0.01em;
}

.page-about .about-role__num {
  font-size: var(--fs-lg);
  font-weight: 700;
  color: var(--c-mist);
  white-space: nowrap;
}

.page-about .about-role__desc {
  margin: 10px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.76;
  color: var(--about-muted-ink);
}

/* ---------------- 五类内容 ---------------- */

.page-about .about-catalog__list {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-catalog__item {
  position: relative;
  padding: 20px 18px 22px;
  background: rgba(12, 58, 49, 0.56);
  border: 1px solid rgba(47, 227, 208, 0.16);
  transition: background var(--dur) var(--ease),
              transform var(--dur) var(--ease);
  clip-path: polygon(0 0,
    calc(100% - var(--about-cut)) 0,
    100% var(--about-cut),
    100% 100%,
    var(--about-cut) 100%,
    0 calc(100% - var(--about-cut)));
}

.page-about .about-catalog__item:hover {
  background: rgba(18, 72, 61, 0.74);
  transform: translateY(-4px);
}

.page-about .about-catalog__num {
  display: block;
  font-size: var(--fs-xs);
  letter-spacing: 0.14em;
  color: var(--c-orange);
}

.page-about .about-catalog__item h3 {
  margin: 12px 0 0;
  font-size: var(--fs-lg);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-catalog__item p {
  margin: 10px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.76;
  color: var(--about-muted);
}

.page-about .about-batch {
  display: grid;
  gap: 14px;
  margin-top: clamp(24px, 3.4vw, 36px);
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px);
  background: linear-gradient(120deg, rgba(255, 122, 41, 0.16), rgba(47, 227, 208, 0.08));
  border: 1px solid rgba(255, 122, 41, 0.3);
}

.page-about .about-batch__label {
  margin: 0;
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--c-sand);
}

.page-about .about-batch__times {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px clamp(16px, 3vw, 36px);
}

.page-about .about-batch__times li {
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-size: var(--fs-sm);
  color: var(--c-fog);
}

.page-about .about-batch__times .mono {
  font-size: var(--fs-h3);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--c-orange);
}

/* ---------------- 合作生态 ---------------- */

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 26px);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-eco__card {
  padding: clamp(22px, 3vw, 30px);
  background: rgba(255, 255, 255, 0.74);
  border: 1px solid rgba(6, 37, 31, 0.12);
  border-top: 3px solid var(--c-mist);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.page-about .about-eco__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 30px rgba(6, 37, 31, 0.12);
}

.page-about .about-eco__num {
  margin: 0;
  font-size: clamp(2.75rem, 6vw, 3.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.045em;
  color: var(--c-mist);
}

.page-about .about-eco__card h3 {
  margin: 8px 0 0;
  font-size: var(--fs-h3);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-eco__card p {
  margin: 12px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: var(--about-muted-ink);
}

.page-about .about-flow {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-flow li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 10px 16px;
  font-size: var(--fs-sm);
  color: var(--c-ink);
  background: rgba(6, 37, 31, 0.06);
  border: 1px solid rgba(6, 37, 31, 0.14);
}

.page-about .about-flow .mono {
  font-size: var(--fs-xs);
  letter-spacing: 0.12em;
  color: var(--c-mist);
}

/* ---------------- 安全与资质 ---------------- */

.page-about .about-security__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

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

.page-about .about-security__text h2 {
  margin: 10px 0 0;
  font-size: var(--fs-h2);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.025em;
}

.page-about .about-security__text > p {
  margin: 14px 0 0;
  max-width: 50ch;
  font-size: var(--fs-md);
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .about-cert {
  list-style: none;
  margin: clamp(24px, 3.4vw, 36px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .cert {
  padding: 16px 18px;
  background: rgba(12, 58, 49, 0.42);
  border: 1px solid var(--about-edge);
  transition: background var(--dur) var(--ease),
              border-color var(--dur) var(--ease),
              transform var(--dur) var(--ease);
}

.page-about .cert:hover,
.page-about .cert:focus-within {
  background: rgba(18, 72, 61, 0.72);
  border-color: rgba(47, 227, 208, 0.6);
  transform: translateY(-4px);
}

.page-about .cert__name {
  margin: 0;
  font-size: var(--fs-sm);
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--c-cyan-soft);
}

.page-about .cert__detail {
  margin: 8px 0 0;
  font-size: var(--fs-xs);
  line-height: 1.74;
  color: var(--about-muted);
}

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

.page-about .about-security__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  clip-path: polygon(0 0,
    calc(100% - 24px) 0,
    100% 24px,
    100% 100%,
    24px 100%,
    0 calc(100% - 24px));
}

/* ---------------- 常见疑问 ---------------- */

.page-about .about-questions {
  background: linear-gradient(180deg, rgba(12, 58, 49, 0.55), rgba(6, 37, 31, 0));
}

.page-about .about-questions__list {
  display: grid;
  gap: 10px;
  margin-top: clamp(24px, 3.4vw, 36px);
  max-width: 860px;
}

.page-about .about-questions .collapse {
  padding: 0;
  background: rgba(12, 58, 49, 0.42);
  border: 1px solid var(--about-edge);
  transition: border-color var(--dur) var(--ease),
              background var(--dur) var(--ease);
}

.page-about .about-questions .collapse:hover {
  border-color: rgba(47, 227, 208, 0.58);
  background: rgba(18, 72, 61, 0.6);
}

.page-about .about-questions .collapse summary {
  padding: 16px 18px;
  font-size: var(--fs-md);
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-fog);
  cursor: pointer;
}

.page-about .about-questions .collapse__body {
  padding: 0 18px 18px;
  font-size: var(--fs-sm);
  line-height: 1.8;
  color: var(--about-muted);
}

.page-about .about-questions .collapse__body p {
  margin: 0;
}

/* ---------------- 三种用法 ---------------- */

.page-about .about-scenes {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(16px, 2.4vw, 24px);
}

.page-about .about-scene {
  padding: 22px 20px 24px;
  background: rgba(255, 255, 255, 0.76);
  border: 1px solid rgba(6, 37, 31, 0.12);
  border-bottom: 3px solid var(--c-orange);
  transition: transform var(--dur) var(--ease),
              box-shadow var(--dur) var(--ease);
}

.page-about .about-scene:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(6, 37, 31, 0.12);
}

.page-about .about-scene__idx {
  display: block;
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--c-mist);
}

.page-about .about-scene h3 {
  margin: 12px 0 0;
  font-size: var(--fs-lg);
  font-weight: 800;
  letter-spacing: -0.02em;
}

.page-about .about-scene p {
  margin: 10px 0 0;
  font-size: var(--fs-sm);
  line-height: 1.78;
  color: var(--about-muted-ink);
}

/* ---------------- 底部数据带 ---------------- */

.page-about .about-band {
  padding-block: clamp(34px, 5vw, 56px);
  background: linear-gradient(108deg, rgba(12, 58, 49, 0.92), rgba(6, 37, 31, 0.96));
  border-top: 1px solid var(--about-edge);
  border-bottom: 1px solid var(--about-edge);
}

.page-about .about-band__lead {
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  font-size: var(--fs-xs);
  letter-spacing: 0.16em;
  color: var(--c-cyan-soft);
}

.page-about .about-band__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px clamp(14px, 2vw, 28px);
}

.page-about .about-band__stats > div {
  display: grid;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid rgba(47, 227, 208, 0.36);
}

.page-about .about-band__num {
  font-size: clamp(1.5rem, 3.4vw, 2rem);
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.035em;
  color: var(--c-orange);
}

.page-about .about-band__cap {
  font-size: var(--fs-xs);
  line-height: 1.5;
  color: var(--about-muted);
}

/* ---------------- 响应式 ---------------- */

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

  .page-about .about-catalog__item:last-child {
    grid-column: 1 / -1;
  }
}

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

  .page-about .about-band__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-batch {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    column-gap: clamp(24px, 4vw, 48px);
  }
}

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

  .page-about .about-scene:nth-child(2) {
    margin-top: 28px;
  }

  .page-about .about-scene:nth-child(3) {
    margin-top: 56px;
  }
}

@media (min-width: 900px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
    column-gap: clamp(32px, 5vw, 64px);
  }

  .page-about .tl {
    padding-left: 64px;
  }

  .page-about .tl::before {
    left: 16px;
  }

  .page-about .tl__node {
    left: -54px;
  }

  .page-about .tl__body {
    max-width: 660px;
  }

  .page-about .tl__item:nth-child(even) .tl__body {
    max-width: 560px;
    margin-left: clamp(24px, 6vw, 96px);
  }
}

@media (min-width: 940px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    column-gap: clamp(32px, 5vw, 72px);
  }

  .page-about .about-security__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 4fr);
    align-items: start;
    column-gap: clamp(36px, 5vw, 72px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-eco__card,
  .page-about .about-scene,
  .page-about .about-catalog__item,
  .page-about .cert,
  .page-about .about-phases a {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-eco__card:hover,
  .page-about .about-scene:hover,
  .page-about .about-catalog__item:hover,
  .page-about .cert:hover,
  .page-about .about-phases a:hover {
    transform: none;
  }
}