.page-about {
  --about-h2: clamp(1.55rem, 3.6vw, 2.3rem);
  --about-h3: clamp(1.05rem, 2.2vw, 1.3rem);
  --about-gap: clamp(48px, 8vw, 96px);
  padding-bottom: clamp(56px, 9vw, 104px);
}

.page-about .about-section {
  margin-top: var(--about-gap);
}

.page-about .about-h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: var(--about-h2);
  line-height: 1.22;
  letter-spacing: -.01em;
  color: var(--white);
  margin: 0 0 18px;
  max-width: 24ch;
}

.page-about .about-h2::after {
  content: "";
  display: block;
  width: 58px;
  height: 3px;
  margin-top: 14px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(57, 242, 196, 0));
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 5vw, 60px) 0 clamp(28px, 5vw, 52px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 78%;
  pointer-events: none;
  background:
    radial-gradient(58% 76% at 20% 8%, rgba(57, 242, 196, 0.16), transparent 64%),
    radial-gradient(48% 68% at 84% 0%, rgba(255, 138, 61, 0.12), transparent 62%);
}

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

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 6.4vw, 3.9rem);
  line-height: 1.08;
  letter-spacing: -.02em;
  color: var(--white);
  margin: 14px 0 20px;
  max-width: 17ch;
  text-shadow: 0 0 24px rgba(57, 242, 196, 0.25), 0 0 1px rgba(57, 242, 196, 0.9);
}

.page-about .about-hero__lede {
  font-family: var(--font-editorial);
  font-size: clamp(1.02rem, 2.1vw, 1.3rem);
  line-height: 1.9;
  color: var(--silver);
  max-width: 58ch;
  margin: 0 0 clamp(24px, 4vw, 42px);
}

.page-about .about-hero__media {
  width: min(100%, 980px);
  margin-left: auto;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* ---------- 年份标尺 + 长文 ---------- */

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

.page-about .about-rail__label {
  font-size: 0.7rem;
  letter-spacing: 0.22em;
  color: var(--cyan);
  margin: 0 0 14px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  position: relative;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(18, 48, 42, 0.6);
  color: var(--silver);
  font-size: 0.88rem;
  text-decoration: none;
  transition: color var(--t) var(--ease), border-color var(--t) var(--ease), background var(--t) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-rail__year {
  font-weight: 700;
  color: var(--cyan);
  transition: color var(--t) var(--ease);
}

.page-about .about-rail__link:hover .about-rail__year,
.page-about .about-rail__link:focus-visible .about-rail__year {
  color: var(--ink);
}

.page-about .about-narrative__intro,
.page-about .about-team__lede,
.page-about .about-sources__lede,
.page-about .about-cadence__lede,
.page-about .about-channels__lede {
  font-size: 1.0625rem;
  line-height: 1.9;
  color: var(--silver);
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 66ch;
}

.page-about .about-season {
  position: relative;
  margin-top: 16px;
  padding: 20px 22px 22px 24px;
  background: linear-gradient(180deg, rgba(18, 48, 42, 0.72), rgba(11, 31, 26, 0.25));
  border: 1px solid var(--line);
  border-left: 2px solid rgba(57, 242, 196, 0.5);
  border-radius: 4px 22px 22px 4px;
}

.page-about .about-season__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--about-h3);
  line-height: 1.4;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .about-season p {
  font-size: 1rem;
  line-height: 1.85;
  color: var(--silver);
  margin: 0;
  max-width: 62ch;
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 5vw, 52px);
  align-items: start;
}

.page-about .about-team__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .about-role {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  grid-template-areas:
    "num name"
    "num desc";
  gap: 6px 18px;
  padding: 20px 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 6px 22px 22px 22px;
  box-shadow: var(--shadow-panel);
}

.page-about .about-role__num {
  grid-area: num;
  font-size: 1.55rem;
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
  padding-top: 3px;
}

.page-about .about-role__name {
  grid-area: name;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 800;
  color: var(--white);
  margin: 0;
}

.page-about .about-role__desc {
  grid-area: desc;
  font-size: 0.96rem;
  line-height: 1.75;
  color: var(--silver);
  margin: 0;
  max-width: 54ch;
}

/* ---------- 素材来源 ---------- */

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

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

.page-about .about-sources__item {
  padding: 11px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(18, 48, 42, 0.7);
  color: var(--white);
  font-size: 0.92rem;
  letter-spacing: 0.02em;
}

.page-about .about-sources__item:nth-child(odd) {
  border-color: rgba(57, 242, 196, 0.45);
}

.page-about .about-sources__item:nth-child(even) {
  border-color: rgba(255, 138, 61, 0.4);
}

/* ---------- 数据横带 ---------- */

.page-about .about-figures__grid {
  list-style: none;
  margin: 0;
  padding: clamp(24px, 4vw, 40px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 34px);
  background:
    linear-gradient(135deg, rgba(18, 48, 42, 0.95), rgba(11, 31, 26, 0.55)),
    radial-gradient(70% 120% at 10% 0%, rgba(57, 242, 196, 0.12), transparent 60%);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
}

.page-about .about-stat {
  position: relative;
  padding-top: 16px;
  border-top: 2px solid var(--line);
  transition: border-color var(--t) var(--ease);
  cursor: default;
}

.page-about .about-stat:hover,
.page-about .about-stat:focus-visible {
  border-top-color: var(--cyan);
  outline: none;
}

.page-about .about-stat:focus-visible {
  box-shadow: 0 0 0 2px rgba(57, 242, 196, 0.55);
  border-radius: 4px;
}

.page-about .about-stat__num {
  font-size: clamp(1.75rem, 4.4vw, 2.5rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--white);
}

.page-about .about-stat__unit {
  font-size: 0.95rem;
  color: var(--silver);
  margin-left: 4px;
}

.page-about .about-stat__label {
  display: block;
  margin-top: 10px;
  font-size: 0.85rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-stat__note {
  display: block;
  margin-top: 8px;
  font-size: 0.82rem;
  line-height: 1.65;
  color: var(--silver);
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity var(--t) var(--ease), max-height var(--t) var(--ease);
}

.page-about .about-stat:hover .about-stat__note,
.page-about .about-stat:focus-visible .about-stat__note {
  opacity: 1;
  max-height: 6em;
}

/* ---------- 赛季四拍 ---------- */

.page-about .about-cadence__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .about-cadence__media {
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-beats {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-beat {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-beat:first-child {
  border-top: 1px solid var(--line);
}

.page-about .about-beat__when {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--orange);
  letter-spacing: 0.04em;
  padding-top: 2px;
}

.page-about .about-beat__what {
  font-size: 0.97rem;
  line-height: 1.75;
  color: var(--silver);
}

.page-about .about-beat__what strong {
  display: block;
  margin-bottom: 5px;
  color: var(--white);
  font-weight: 700;
}

/* ---------- 三块坚持 ---------- */

.page-about .about-beliefs {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-belief {
  padding: 24px 22px 26px;
  background: linear-gradient(160deg, rgba(18, 48, 42, 0.95), rgba(11, 31, 26, 0.5));
  border: 1px solid var(--line);
  border-radius: 22px 8px 22px 22px;
}

.page-about .about-belief:nth-child(2) {
  border-radius: 8px 22px 22px 22px;
}

.page-about .about-belief:nth-child(3) {
  border-radius: 22px 22px 8px 22px;
}

.page-about .about-belief h3 {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 800;
  color: var(--white);
  margin: 0 0 10px;
}

.page-about .about-belief p {
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--silver);
  margin: 0;
}

/* ---------- 八个栏目 ---------- */

.page-about .about-channels__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
}

.page-about .about-channel {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(18, 48, 42, 0.55);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  transition: border-color var(--t) var(--ease), background var(--t) var(--ease), transform var(--t) var(--ease);
}

.page-about .about-channel:hover,
.page-about .about-channel:focus-visible {
  border-color: var(--cyan);
  background: rgba(57, 242, 196, 0.09);
  transform: translateX(3px);
}

.page-about .about-channel__no {
  font-size: 0.82rem;
  color: var(--cyan);
}

.page-about .about-channel__body {
  display: block;
  min-width: 0;
}

.page-about .about-channel__name {
  display: block;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-channel__desc {
  display: block;
  margin-top: 3px;
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--silver);
}

.page-about .about-channel__arrow {
  color: var(--cyan);
  font-size: 1.05rem;
}

/* ---------- 收尾 ---------- */

.page-about .about-closing__line {
  font-family: var(--font-editorial);
  font-style: italic;
  font-size: clamp(1.1rem, 2.5vw, 1.6rem);
  line-height: 1.75;
  color: var(--white);
  max-width: 42ch;
  margin: 0 0 clamp(24px, 4vw, 36px);
  padding-left: 20px;
  border-left: 3px solid var(--orange);
}

.page-about .about-closing .index-entry {
  margin-top: 0;
}

/* ---------- 悬停能力弱的设备 ---------- */

@media (hover: none) {
  .page-about .about-stat__note {
    opacity: 1;
    max-height: 6em;
  }
}

/* ---------- 中屏 ---------- */

@media (min-width: 720px) {
  .page-about .about-figures__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

/* ---------- 桌面 ---------- */

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: clamp(36px, 5vw, 76px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 116px;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 18px;
    padding-left: 22px;
  }

  .page-about .about-rail__list::before {
    content: "";
    position: absolute;
    left: 4px;
    top: 8px;
    bottom: 8px;
    width: 1px;
    background: linear-gradient(180deg, rgba(57, 242, 196, 0.85), rgba(57, 242, 196, 0.05));
  }

  .page-about .about-rail__link {
    position: relative;
    display: grid;
    grid-template-columns: 1fr;
    gap: 3px;
    padding: 6px 10px;
    border-color: transparent;
    background: transparent;
    border-radius: 10px;
  }

  .page-about .about-rail__link::before {
    content: "";
    position: absolute;
    left: -22px;
    top: 12px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    background: var(--ink);
    border: 2px solid var(--line);
    transition: background var(--t) var(--ease), border-color var(--t) var(--ease), box-shadow var(--t) var(--ease);
  }

  .page-about .about-rail__item[data-seen] .about-rail__link::before {
    background: var(--cyan);
    border-color: var(--cyan);
    box-shadow: 0 0 0 4px rgba(57, 242, 196, 0.14);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(57, 242, 196, 0.1);
    color: var(--white);
    border-color: transparent;
  }

  .page-about .about-rail__link:hover .about-rail__year,
  .page-about .about-rail__link:focus-visible .about-rail__year {
    color: var(--cyan);
  }

  .page-about .about-rail__text {
    font-size: 0.86rem;
    line-height: 1.5;
    color: var(--silver);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .about-cadence__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
  }

  .page-about .about-beliefs {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__media {
    width: min(100%, 1040px);
  }

  .page-about .about-narrative {
    max-width: 72ch;
  }
}