.page-about {
  --about-hair: 1px solid rgba(95, 122, 98, 0.38);
  --about-gap: clamp(52px, 7vw, 96px);
  color: var(--ink);
}

.page-about .about-section__lede {
  max-width: 46ch;
  margin-top: 16px;
  color: var(--ink-70);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: linear-gradient(165deg, rgba(14, 42, 38, 0.9), rgba(11, 27, 43, 0) 64%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 30px;
  padding-block: clamp(30px, 5vw, 58px) clamp(40px, 6vw, 78px);
}

.page-about .about-hero__copy .tag {
  display: inline-block;
  margin-bottom: 18px;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(36px, 6.4vw, 78px);
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.page-about .about-hero__lede {
  max-width: 42ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ink-70);
}

.page-about .about-index {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  background: rgba(95, 122, 98, 0.35);
  border: 1px solid rgba(95, 122, 98, 0.35);
}

.page-about .about-index__item {
  padding: 12px 14px;
  background: rgba(11, 27, 43, 0.88);
}

.page-about .about-index__k {
  display: block;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--ink-40);
}

.page-about .about-index__v {
  display: block;
  margin-top: 5px;
  font-family: var(--font-num);
  font-size: 19px;
  font-variant-numeric: tabular-nums;
  color: var(--c-mint);
}

.page-about .about-hero__figure {
  margin: 0;
  align-self: end;
}

.page-about .media img {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 章节外壳 ---------- */
.page-about .about-section {
  padding-block: var(--about-gap);
  border-top: var(--about-hair);
}

.page-about .about-section--forest {
  background: rgba(14, 42, 38, 0.62);
}

.page-about .about-section--rock {
  background: rgba(36, 50, 56, 0.4);
}

.page-about .about-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding-top: 14px;
  border-top: var(--about-hair);
}

.page-about .about-head__num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-clay);
}

.page-about .about-head__title {
  margin: 0;
  text-align: right;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(22px, 3.4vw, 34px);
  line-height: 1.18;
  letter-spacing: -0.02em;
}

/* ---------- 01 四类栏目 ---------- */
.page-about .about-do {
  display: grid;
  gap: 1px;
  margin-top: 28px;
  background: rgba(95, 122, 98, 0.35);
  border: 1px solid rgba(95, 122, 98, 0.35);
}

.page-about .about-do__item {
  padding: 22px 18px;
  background: rgba(11, 27, 43, 0.78);
  transition: background var(--t-fast) var(--ease);
}

.page-about .about-do__label {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-mint);
}

.page-about .about-do__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.72;
  color: var(--ink-70);
}

@media (hover: hover) {
  .page-about .about-do__item:hover {
    background: rgba(36, 50, 56, 0.72);
  }
}

/* ---------- 02 时间线 ---------- */
.page-about .tl {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 32px 26px;
  border-left: 1px solid rgba(95, 122, 98, 0.45);
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .tl__node {
  position: absolute;
  left: -5px;
  top: 9px;
  width: 9px;
  height: 9px;
  background: var(--c-clay);
  transform: rotate(45deg);
}

.page-about .tl__idx {
  display: block;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--ink-40);
}

.page-about .tl__title {
  margin: 8px 0 6px;
  font-size: 18px;
  font-weight: 500;
  letter-spacing: 0.01em;
}

.page-about .tl__note {
  max-width: 34ch;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-70);
}

.page-about .tl__result {
  display: inline-block;
  margin-top: 12px;
  padding: 3px 10px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-night);
  background: var(--c-mint);
}

/* ---------- 03 流程 ---------- */
.page-about .flow-band {
  display: none;
}

.page-about .about-flow {
  display: grid;
  gap: 12px;
  margin-top: 26px;
}

.page-about .flow-step {
  position: relative;
  padding: 18px 16px 20px;
  border: 1px solid rgba(95, 122, 98, 0.4);
  background: rgba(36, 50, 56, 0.45);
  transition: opacity var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease), transform var(--t-fast) var(--ease);
}

.page-about .flow-step__num {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-clay);
}

.page-about .flow-step__title {
  margin: 8px 0 6px;
  font-size: 16px;
  font-weight: 500;
}

.page-about .flow-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.68;
  color: var(--ink-70);
}

@media (hover: hover) {
  .page-about .about-flow:hover .flow-step {
    opacity: 0.45;
  }

  .page-about .about-flow:hover .flow-step:hover {
    opacity: 1;
    border-color: var(--c-mint);
    transform: translateY(-2px);
  }
}

.page-about .about-banner {
  margin: 32px 0 0;
}

/* ---------- 04 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 30px;
  margin-top: 32px;
}

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

.page-about .team-grid {
  display: grid;
  gap: 24px;
}

.page-about .team-card {
  position: relative;
  z-index: 0;
  padding: 22px 20px;
  border: 1px solid rgba(242, 237, 228, 0.3);
  background: rgba(14, 42, 38, 0.92);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 8px;
  right: -8px;
  bottom: -8px;
  z-index: -1;
  border: 1px solid rgba(242, 237, 228, 0.16);
}

.page-about .team-card__meta {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-mint);
}

.page-about .team-card__name {
  margin: 9px 0 0;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 400;
  letter-spacing: 0.01em;
  line-height: 1.35;
}

.page-about .team-card__duty {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-70);
}

.page-about .team-card__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(242, 237, 228, 0.22);
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-55);
}

@media (hover: hover) {
  .page-about .team-card__note {
    max-height: 0;
    margin-top: 0;
    padding-top: 0;
    border-top-color: transparent;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--t-mid) var(--ease),
      opacity var(--t-mid) var(--ease), margin var(--t-mid) var(--ease),
      padding var(--t-mid) var(--ease);
  }

  .page-about .team-card:hover .team-card__note,
  .page-about .team-card:focus-within .team-card__note {
    max-height: 140px;
    margin-top: 14px;
    padding-top: 12px;
    border-top-color: rgba(242, 237, 228, 0.22);
    opacity: 1;
  }
}

/* ---------- 05 覆盖与节奏 ---------- */
.page-about .about-cov {
  display: grid;
  gap: 34px;
  margin-top: 30px;
}

.page-about .cov-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(95, 122, 98, 0.35);
  border: 1px solid rgba(95, 122, 98, 0.35);
}

.page-about .cov-cell {
  padding: 20px 16px;
  background: rgba(11, 27, 43, 0.82);
}

.page-about .cov-cell__num {
  display: block;
  font-family: var(--font-num);
  font-size: clamp(25px, 4vw, 33px);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--c-mint);
}

.page-about .cov-cell__unit {
  margin-left: 3px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-55);
}

.page-about .cov-cell__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ink-55);
}

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

.page-about .rhythm-list__item {
  display: grid;
  grid-template-columns: 4.6em minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: var(--about-hair);
}

.page-about .rhythm-list__k {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--c-yellow);
}

.page-about .rhythm-list__v {
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink-70);
}

/* ---------- 06 参与路径 ---------- */
.page-about .next-grid {
  display: grid;
  gap: 18px;
  margin-top: 30px;
}

.page-about .next-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border: var(--about-hair);
  background: rgba(11, 27, 43, 0.62);
  transition: border-color var(--t-fast) var(--ease),
    transform var(--t-fast) var(--ease);
}

.page-about .next-card__title {
  margin: 0;
  font-size: 17px;
  font-weight: 500;
  letter-spacing: 0.02em;
}

.page-about .next-card__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-70);
}

.page-about .next-card .btn {
  align-self: flex-start;
  margin-top: 6px;
}

@media (hover: hover) {
  .page-about .next-card:hover {
    border-color: var(--c-mint);
    transform: translateY(-2px);
  }
}

.page-about .about-note {
  max-width: 62ch;
  margin: 28px 0 0;
  padding-left: 16px;
  border-left: 2px solid rgba(59, 239, 196, 0.5);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-55);
}

.page-about .about-note a {
  color: var(--c-mint);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 239, 196, 0.45);
}

.page-about .about-note a:hover {
  border-bottom-color: var(--c-mint);
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) {
  .page-about .about-index {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-about .about-do {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .tl__item {
    padding-left: 34px;
  }
}

@media (min-width: 880px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.6fr);
    align-items: end;
    gap: clamp(28px, 4vw, 54px);
  }

  .page-about .about-flow {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .flow-band {
    display: block;
    width: 100%;
    height: 20px;
    margin-top: 28px;
  }

  .page-about .about-cov {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.62fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .team-grid .team-card:nth-child(even) {
    margin-top: 28px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-head__title {
    text-align: right;
    padding-left: 18%;
  }

  .page-about .tl {
    max-width: 780px;
  }

  .page-about .tl__note {
    max-width: 40ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition: none !important;
    transform: none !important;
  }
}