/* ===== 页面：自持与安全（/foundation/） ===== */

.page-about {
  --about-head-bg: #0E151D;
  --about-rule: 1px solid var(--color-line);
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb {
  padding-top: clamp(20px, 3vw, 34px);
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  margin: 0 0 clamp(8px, 1.5vw, 18px);
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--color-muted);
}

.page-about .breadcrumb__list li {
  display: inline-flex;
  align-items: center;
  gap: 10px;
}

.page-about .breadcrumb__list li + li::before {
  content: "/";
  color: var(--color-line);
}

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

.page-about .breadcrumb__list a:hover,
.page-about .breadcrumb__list a:focus-visible {
  color: var(--color-cyan-soft);
}

.page-about .breadcrumb__list [aria-current="page"] {
  color: var(--color-text);
}

/* ---- 首屏 ---- */
.page-about .about-hero {
  padding-top: clamp(24px, 4vw, 52px);
  padding-bottom: clamp(32px, 5vw, 68px);
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: start;
}

.page-about .about-hero__text h1 {
  margin: 0 0 clamp(16px, 2vw, 24px);
  font-size: clamp(32px, 5.2vw, 62px);
  line-height: 1.07;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--color-text);
  max-width: 15ch;
}

.page-about .about-hero__text .lead {
  margin: 0;
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--color-text);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(24px, 3vw, 38px) 0 0;
  padding: 0;
  border-top: var(--about-rule);
  max-width: 580px;
}

.page-about .about-hero__facts li {
  display: grid;
  grid-template-columns: 13px minmax(0, 1fr);
  column-gap: 12px;
  padding: 13px 0;
  border-bottom: var(--about-rule);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-muted);
}

.page-about .about-hero__facts li::before {
  content: "";
  width: 7px;
  height: 7px;
  margin-top: 9px;
  background: var(--color-cyan);
}

.page-about .about-hero__facts strong {
  margin-right: 6px;
  font-weight: 700;
  color: var(--color-cyan-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 38px);
}

.page-about .about-hero__media {
  margin: 0;
  border: var(--about-rule);
  background: var(--color-panel);
}

.page-about .about-hero__media img,
.page-about .about-fees__media img,
.page-about .about-release__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-hero__media img {
  aspect-ratio: 14 / 9;
}

/* ---- 页内锚点导航 ---- */
.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 6;
  background: rgba(5, 7, 10, 0.94);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
  backdrop-filter: blur(8px);
}

.page-about .about-toc ul {
  display: flex;
  gap: clamp(16px, 3vw, 34px);
  margin: 0;
  padding: 13px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-toc ul::-webkit-scrollbar {
  display: none;
}

.page-about .about-toc li {
  flex: 0 0 auto;
}

.page-about .about-toc a {
  display: inline-block;
  padding-bottom: 3px;
  font-size: 13.5px;
  color: var(--color-muted);
  text-decoration: none;
  white-space: nowrap;
  border-bottom: 1px solid transparent;
}

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

/* ---- 通用区块 ---- */
.page-about .about-band {
  padding-block: clamp(44px, 7vw, 92px);
  border-bottom: var(--about-rule);
}

.page-about .about-band--anchors {
  border-bottom: 0;
}

.page-about .about-band__head {
  max-width: 780px;
  margin-bottom: clamp(24px, 3.5vw, 44px);
}

.page-about .about-band__head .section-title {
  margin: 12px 0 16px;
}

.page-about .about-band__intro {
  margin: 0;
  max-width: 46ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-muted);
}

.page-about .about-band__note {
  margin: clamp(22px, 3vw, 34px) 0 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--color-muted);
}

/* ---- 对照表 ---- */
.page-about .about-table-bleed {
  margin-inline: 0;
}

.page-about .about-table-wrap {
  overflow-x: auto;
  border: var(--about-rule);
  background: var(--color-panel);
  scrollbar-color: var(--color-line) transparent;
}

.page-about .about-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
  font-size: 14.5px;
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 16px 18px;
  text-align: left;
  vertical-align: top;
  line-height: 1.75;
  border-bottom: var(--about-rule);
}

.page-about .about-table tbody tr:last-child th,
.page-about .about-table tbody tr:last-child td {
  border-bottom: 0;
}

.page-about .about-table thead th {
  position: sticky;
  top: 0;
  z-index: 3;
  padding-block: 14px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  white-space: nowrap;
  color: var(--color-text);
  background: var(--about-head-bg);
}

.page-about .about-table tbody th {
  font-size: 14.5px;
  font-weight: 700;
  white-space: nowrap;
  color: var(--color-text);
}

.page-about .about-table__dim {
  width: 150px;
}

.page-about .about-table__self,
.page-about .about-table__cust {
  border-left: var(--about-rule);
}

.page-about .about-table__self {
  color: var(--color-text);
}

.page-about .about-table__cust {
  color: var(--color-muted);
}

.page-about .about-table thead .about-table__self {
  color: var(--color-cyan);
  border-left: 1px solid rgba(23, 225, 214, 0.45);
}

.page-about .about-table thead .about-table__cust {
  border-left: 1px solid rgba(138, 152, 166, 0.45);
}

.page-about .about-table tbody tr:hover td,
.page-about .about-table tbody tr:hover th {
  background: rgba(23, 225, 214, 0.05);
}

.page-about .about-table__note {
  margin: 12px 0 0;
  font-size: 13px;
}

/* ---- 手续费档位 ---- */
.page-about .about-fees__media {
  margin: 0 0 clamp(24px, 3.5vw, 40px);
  border: var(--about-rule);
  background: var(--color-panel);
}

.page-about .about-fees__media img {
  aspect-ratio: 7 / 4;
  opacity: 0.92;
}

.page-about .about-fee-grid {
  display: grid;
  gap: 12px;
}

.page-about .about-fee {
  padding: 0 18px;
  border: var(--about-rule);
  background: var(--color-panel);
}

.page-about .about-fee__summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
}

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

.page-about .about-fee__summary::after {
  content: "";
  width: 8px;
  height: 8px;
  margin-left: 10px;
  border-right: 1px solid var(--color-muted);
  border-bottom: 1px solid var(--color-muted);
  transform: rotate(45deg);
  transition: transform 0.2s ease;
}

.page-about .about-fee[open] .about-fee__summary {
  color: var(--color-cyan-soft);
}

.page-about .about-fee[open] .about-fee__summary::after {
  transform: rotate(-135deg);
}

.page-about .about-fee__tag {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 30px;
  height: 22px;
  padding: 0 6px;
  font-size: 12px;
  color: var(--color-amber);
  border: 1px solid rgba(255, 178, 63, 0.5);
}

.page-about .about-fee__hint {
  margin-left: auto;
  font-size: 12px;
  font-weight: 400;
  color: var(--color-muted);
}

.page-about .about-fee__body {
  padding: 0 0 18px;
  margin-top: -1px;
  border-top: var(--about-rule);
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--color-muted);
}

.page-about .about-fee__body p {
  margin: 14px 0 0;
}

.page-about .about-fee-facts {
  margin-top: clamp(20px, 3vw, 32px);
  gap: 12px;
}

/* ---- 自持的代价 ---- */
.page-about .about-cost {
  max-width: 880px;
}

.page-about .about-cost__lead {
  margin: 0 0 clamp(28px, 4vw, 52px);
  max-width: 40ch;
  font-size: clamp(17px, 2vw, 20px);
  line-height: 1.8;
  color: var(--color-text);
}

.page-about .about-cost__list {
  display: grid;
  gap: clamp(24px, 3vw, 38px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cost__list li {
  padding: 4px 0 4px 20px;
  border-left: 2px solid var(--color-danger);
}

.page-about .about-cost__idx {
  display: block;
  margin-bottom: 8px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-danger);
}

.page-about .about-cost__list h3 {
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 22px);
  letter-spacing: -0.01em;
  color: var(--color-text);
}

.page-about .about-cost__list p {
  margin: 0;
  max-width: 54ch;
  line-height: 1.85;
  color: var(--color-muted);
}

.page-about .about-cost__link {
  margin: clamp(28px, 4vw, 48px) 0 0;
  max-width: 48ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--color-muted);
}

/* ---- 发布流程时间轴 ---- */
.page-about .about-release__body {
  display: grid;
  gap: clamp(28px, 4vw, 48px);
  align-items: start;
}

.page-about .about-release__media {
  margin: 0;
  border: var(--about-rule);
  background: var(--color-panel);
}

.page-about .about-release__media img {
  aspect-ratio: 12 / 7;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 18px;
  bottom: 18px;
  width: 1px;
  background: var(--color-line);
}

.page-about .about-timeline .timeline__item {
  position: relative;
  padding-left: 34px;
  border-bottom: var(--about-rule);
}

.page-about .about-timeline .timeline__item:last-child {
  border-bottom: 0;
}

.page-about .about-timeline .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 19px;
  width: 11px;
  height: 11px;
  border: 1px solid var(--color-cyan);
  background: var(--color-void);
  transform: rotate(45deg);
}

.page-about .about-stage__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 17px 0;
  cursor: pointer;
  list-style: none;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--color-text);
}

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

.page-about .about-stage__summary::after {
  content: "+";
  margin-left: auto;
  padding-left: 12px;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--color-muted);
}

.page-about .about-stage[open] .about-stage__summary {
  color: var(--color-cyan);
}

.page-about .about-stage[open] .about-stage__summary::after {
  content: "\2013";
  color: var(--color-cyan);
}

.page-about .about-stage__no {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-muted);
}

.page-about .about-stage__body {
  padding: 0 0 18px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--color-muted);
}

.page-about .about-stage__body p {
  margin: 0;
  max-width: 54ch;
}

.page-about .fold__summary:focus-visible {
  outline: 2px solid var(--color-cyan);
  outline-offset: 2px;
}

/* ---- 审阅与问题提交 ---- */
.page-about .about-review {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

.page-about .about-review__main .section-title {
  margin: 12px 0 18px;
}

.page-about .about-review__main p {
  margin: 0 0 14px;
  max-width: 46ch;
  line-height: 1.85;
  color: var(--color-muted);
}

.page-about .about-review__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-review__modules {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: var(--about-rule);
}

.page-about .about-review__modules li {
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr);
  column-gap: 14px;
  row-gap: 4px;
  padding: 16px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-review__modules .about-mod__no {
  grid-row: span 2;
  padding-top: 3px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--color-cyan);
}

.page-about .about-review__modules strong {
  font-size: 15px;
  color: var(--color-text);
}

.page-about .about-review__modules .about-mod__desc {
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--color-muted);
}

/* ---- 安全锚点 ---- */
.page-about .about-anchors {
  padding: clamp(24px, 4vw, 42px);
}

.page-about .about-anchors__title {
  margin: 12px 0 clamp(20px, 3vw, 32px);
}

.page-about .about-anchors__list {
  display: grid;
  gap: 22px;
  margin: 0;
}

.page-about .about-anchors__row {
  padding-left: 18px;
  border-left: 2px solid var(--color-cyan);
}

.page-about .about-anchors__row dt {
  margin-bottom: 6px;
  font-size: 15px;
  font-weight: 700;
  color: var(--color-text);
}

.page-about .about-anchors__row dd {
  margin: 0;
  max-width: 64ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--color-muted);
}

.page-about .about-anchors .risk-note {
  margin-top: clamp(22px, 3vw, 32px);
}

/* ---- 响应式 ---- */
@media (min-width: 860px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

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

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

  .page-about .about-release__body {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  }

  .page-about .about-review {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-table-bleed {
    margin-inline: -24px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__inner {
    gap: clamp(48px, 5vw, 72px);
  }

  .page-about .about-table-bleed {
    margin-inline: -40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-fee__summary::after {
    transition: none;
  }
}