.page-about {
  --about-cut: 18px;
  --about-line: 1px solid rgba(184, 137, 43, 0.34);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(56px, 9vw, 104px) 0 clamp(48px, 7vw, 88px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(32px, 5vw, 64px);
  margin-top: clamp(28px, 4vw, 48px);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(2.1rem, 3.8vw, 3.6rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  margin: 14px 0 0;
  color: var(--ivory-050);
}

.page-about .about-hero__text {
  font-size: var(--body-fluid);
  line-height: 1.85;
  max-width: 40ch;
  margin: clamp(16px, 2vw, 22px) 0 0;
  color: var(--sage-500);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(24px, 3vw, 34px) 0 0;
  padding: clamp(16px, 2vw, 22px) 0 0;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  border-top: var(--about-line);
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
  font-size: 0.84rem;
  line-height: 1.6;
  color: var(--sage-500);
}

.page-about .about-hero__fact .mono-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--gold-300);
  line-height: 1.1;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 32px);
}

/* 首屏视觉：纯 CSS 档案面板 */
.page-about .about-hero__visual {
  display: flex;
  justify-content: flex-end;
}

.page-about .about-plate {
  position: relative;
  width: min(100%, 360px);
  aspect-ratio: 4 / 5;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: clamp(16px, 2.2vw, 24px);
  padding: clamp(56px, 7vw, 72px) clamp(24px, 3vw, 36px) clamp(24px, 3vw, 36px);
  background:
    repeating-linear-gradient(90deg, rgba(184, 137, 43, 0.13) 0 1px, transparent 1px 34px),
    repeating-linear-gradient(0deg, rgba(184, 137, 43, 0.13) 0 1px, transparent 1px 34px),
    linear-gradient(160deg, rgba(18, 59, 47, 0.96), rgba(6, 18, 15, 0.98));
  border: var(--about-line);
  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-plate__tag {
  position: absolute;
  top: clamp(18px, 2.6vw, 26px);
  left: clamp(22px, 3vw, 32px);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--gold-300);
}

.page-about .about-plate__rule {
  display: block;
  height: 1px;
  width: 62%;
  background: linear-gradient(90deg, var(--gold-600), rgba(184, 137, 43, 0));
}

.page-about .about-plate__rule:nth-of-type(2) {
  width: 86%;
}

.page-about .about-plate__rule:nth-of-type(3) {
  width: 48%;
}

.page-about .about-plate__rule--red {
  height: 2px;
  width: 92%;
  background: linear-gradient(90deg, var(--red-600), rgba(192, 57, 43, 0));
}

.page-about .about-plate__caption {
  margin-top: clamp(6px, 1vw, 12px);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.12em;
  color: var(--sage-500);
}

/* ---------- 主体：堆叠面板区 ---------- */
.page-about .about-body {
  padding: clamp(40px, 6vw, 76px) 0 clamp(64px, 8vw, 112px);
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(30, 90, 71, 0.5), transparent 62%),
    linear-gradient(180deg, var(--ink-900), var(--deep-950));
}

.page-about .about-body__wrap {
  display: grid;
  gap: clamp(22px, 3vw, 36px);
}

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

/* 侧栏目录 */
.page-about .about-toc__title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--gold-300);
  margin: 0 0 12px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

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

.page-about .about-toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid rgba(184, 137, 43, 0.34);
  border-radius: var(--pill);
  color: var(--ivory-050);
  text-decoration: none;
  font-size: 0.84rem;
  white-space: nowrap;
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  border-color: var(--gold-600);
  background: rgba(184, 137, 43, 0.14);
}

.page-about .about-toc__link .mono-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--gold-300);
}

/* 面板外壳 */
.page-about .about-panel {
  position: relative;
  padding: 1px;
  margin-bottom: clamp(22px, 3vw, 38px);
  background: rgba(184, 137, 43, 0.42);
  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-panel:last-child {
  margin-bottom: 0;
}

.page-about .about-panel__inner {
  padding: clamp(26px, 3.6vw, 48px) clamp(20px, 3vw, 44px) clamp(30px, 4vw, 52px);
  background: var(--ink-700);
  color: var(--ivory-050);
  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-panel--ivory .about-panel__inner {
  background: linear-gradient(168deg, var(--ivory-050), #EBE4D5);
  color: var(--ink-900);
}

.page-about .about-panel--deep .about-panel__inner {
  background: var(--deep-950);
  color: var(--ivory-050);
}

.page-about .about-panel__head {
  display: flex;
  align-items: baseline;
  gap: clamp(12px, 2vw, 20px);
  padding-bottom: 12px;
  margin-bottom: clamp(18px, 2.4vw, 28px);
  border-bottom: var(--about-line);
}

.page-about .about-panel__index {
  font-family: var(--font-mono);
  font-weight: 300;
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  line-height: 0.88;
  color: var(--gold-600);
  opacity: 0.85;
}

.page-about .about-panel__kicker {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--sage-500);
}

.page-about .about-panel__title {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.45rem, 2.6vw, 2.15rem);
  line-height: 1.32;
  letter-spacing: -0.01em;
  margin: 0 0 clamp(14px, 1.8vw, 20px);
}

.page-about .about-panel__lede {
  font-size: var(--body-fluid);
  line-height: 1.9;
  max-width: 46ch;
  margin: 0 0 clamp(22px, 3vw, 32px);
  color: var(--sage-500);
}

.page-about .about-panel__cols {
  display: grid;
  gap: clamp(20px, 3vw, 36px);
}

.page-about .about-panel__lead p,
.page-about .about-panel__body p {
  margin: 0 0 1em;
  font-size: var(--body-fluid);
  line-height: 1.9;
  max-width: 44ch;
}

.page-about .about-panel__body p:last-child,
.page-about .about-panel__lead p:last-child {
  margin-bottom: 0;
}

.page-about .about-panel--ink .about-panel__lead p,
.page-about .about-panel--ink .about-panel__body p,
.page-about .about-panel--deep .about-panel__lead p,
.page-about .about-panel--deep .about-panel__body p {
  color: rgba(244, 239, 228, 0.86);
}

.page-about .about-panel__lead p {
  font-weight: 500;
}

/* ---------- 章节 02 沿革 ---------- */
.page-about .about-history__grid {
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}

.page-about .about-history__figure,
.page-about .about-spec__figure,
.page-about .about-team__figure {
  margin: 0;
}

.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0 0 12px;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(210px, 1fr);
  gap: clamp(16px, 2vw, 26px);
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-track__item {
  position: relative;
  scroll-snap-align: start;
  padding-top: 26px;
  border-top: 1px solid rgba(184, 137, 43, 0.4);
}

.page-about .about-track__item--now {
  border-top-color: var(--red-600);
}

.page-about .about-track__node {
  position: absolute;
  top: -5px;
  left: 0;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold-600);
}

.page-about .about-track__item--now .about-track__node {
  background: var(--red-600);
  box-shadow: 0 0 0 5px rgba(192, 57, 43, 0.18);
}

.page-about .about-track__phase {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--gold-300);
}

.page-about .about-track__item--now .about-track__phase {
  color: var(--red-600);
}

.page-about .about-track__title {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ivory-050);
}

.page-about .about-track__text {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.8;
  color: rgba(244, 239, 228, 0.74);
}

/* ---------- 章节 03 规范 ---------- */
.page-about .about-spec__grid {
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}

.page-about .about-spec__item {
  border-top: 1px solid rgba(110, 131, 119, 0.36);
  padding: clamp(12px, 1.6vw, 18px) 0;
}

.page-about .about-spec__item:last-child {
  border-bottom: 1px solid rgba(110, 131, 119, 0.36);
}

.page-about .about-spec__item summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 4px 0;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.6;
  color: var(--ink-900);
}

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

.page-about .about-spec__item summary::after {
  content: "+";
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--gold-600);
  transition: transform var(--dur) var(--ease);
}

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

.page-about .about-spec__item p {
  margin: 10px 0 4px;
  font-size: 0.96rem;
  line-height: 1.88;
  max-width: 44ch;
  color: var(--sage-500);
}

/* ---------- 章节 04 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: clamp(24px, 3vw, 36px);
}

.page-about .about-team__table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-team__table {
  width: 100%;
  min-width: 460px;
  border-collapse: collapse;
}

.page-about .about-team__table th,
.page-about .about-team__table td {
  text-align: left;
  vertical-align: top;
  padding: clamp(12px, 1.6vw, 16px) 10px;
  border-bottom: 1px solid rgba(184, 137, 43, 0.24);
  font-size: 0.94rem;
  line-height: 1.78;
}

.page-about .about-team__table thead th {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--gold-300);
  border-bottom-color: rgba(184, 137, 43, 0.5);
}

.page-about .about-team__table tbody th {
  font-weight: 600;
  color: var(--ivory-050);
  white-space: nowrap;
}

.page-about .about-team__table tbody td {
  color: rgba(244, 239, 228, 0.8);
}

.page-about .about-team__table tbody tr {
  transition: background var(--dur) var(--ease);
}

.page-about .about-team__table tbody tr:hover {
  background: rgba(184, 137, 43, 0.12);
}

.page-about .about-team__table .num {
  font-family: var(--font-mono);
  color: var(--blue-400);
  white-space: nowrap;
}

.page-about .about-team__note {
  margin: clamp(16px, 2vw, 22px) 0 0;
  font-size: 0.92rem;
  line-height: 1.85;
  max-width: 44ch;
  color: var(--sage-500);
}

/* ---------- 章节 05 供稿 ---------- */
.page-about .about-supply__ledger {
  margin: clamp(8px, 1vw, 14px) 0 0;
}

/* ---------- 章节 06 服务与备案 ---------- */
.page-about .about-service__info {
  list-style: none;
  margin: 0 0 clamp(20px, 2.6vw, 28px);
  padding: 1px;
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  background: rgba(184, 137, 43, 0.36);
  border: 1px solid rgba(184, 137, 43, 0.36);
}

.page-about .about-service__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(14px, 2vw, 20px);
  background: var(--ivory-050);
}

.page-about .about-service__key {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--sage-500);
}

.page-about .about-service__val {
  font-size: 1rem;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .about-service__val.mono-num {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.page-about .about-service__note {
  margin: 0 0 clamp(24px, 3vw, 34px);
  font-size: var(--body-fluid);
  line-height: 1.9;
  max-width: 52ch;
  color: var(--ink-700);
}

.page-about .about-read-next {
  padding-top: clamp(16px, 2vw, 22px);
  border-top: 1px solid rgba(110, 131, 119, 0.36);
}

.page-about .about-read-next__title {
  margin: 0 0 12px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--sage-500);
}

.page-about .about-read-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 18px;
}

.page-about .about-read-next__link {
  display: inline-block;
  font-size: 0.92rem;
  line-height: 1.6;
  color: var(--ink-900);
  text-decoration: none;
  border-bottom: 1px solid rgba(184, 137, 43, 0.5);
  padding-bottom: 2px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-read-next__link:hover,
.page-about .about-read-next__link:focus-visible {
  color: var(--red-600);
  border-color: var(--red-600);
}

/* ---------- 断点 ---------- */
@media (min-width: 860px) {
  .page-about .about-panel__cols {
    grid-template-columns: 1fr 1.35fr;
  }

  .page-about .about-spec__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.15fr 0.85fr;
    align-items: center;
  }

  .page-about .about-history__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }
}

@media (min-width: 600px) {
  .page-about .about-service__info {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1000px) {
  .page-about .about-body__wrap {
    grid-template-columns: minmax(0, 1fr) 250px;
    align-items: start;
  }

  .page-about .about-body__toc {
    grid-column: 2;
    grid-row: 1;
    position: sticky;
    top: 104px;
  }

  .page-about .about-body__flow {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 6px;
    overflow: visible;
  }

  .page-about .about-toc__link {
    width: 100%;
    border-radius: 6px;
    justify-content: flex-start;
  }
}

@media (min-width: 1100px) {
  .page-about .about-body__flow > .about-panel:nth-child(odd) {
    margin-right: 22px;
  }

  .page-about .about-body__flow > .about-panel:nth-child(even) {
    margin-left: 22px;
  }
}

@media (max-width: 640px) {
  .page-about .about-hero__visual {
    justify-content: flex-start;
  }

  .page-about .about-plate {
    width: 100%;
    aspect-ratio: 3 / 4;
  }

  .page-about .about-team__table {
    min-width: 420px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-read-next__link,
  .page-about .about-team__table tbody tr,
  .page-about .about-spec__item summary::after {
    transition: none;
  }
}