/* ===== page: about ===== */
.page-about {
  --about-index-w: 168px;
  --about-ink-soft: rgba(16, 42, 60, 0.72);
  background: var(--ink);
}

/* ---------- 面包屑 ---------- */
.page-about .about-top {
  padding-top: clamp(18px, 4vw, 32px);
}

.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .crumbs a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(88, 211, 200, 0.35);
  padding-bottom: 1px;
  transition: color 0.18s ease, border-color 0.18s ease;
}

.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--gold-soft);
  border-color: var(--gold-soft);
}

.page-about .crumbs__sep {
  color: rgba(169, 182, 191, 0.5);
}

/* ---------- 封面首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 5vw, 46px) 0 clamp(40px, 8vw, 88px);
  background:
    radial-gradient(120% 85% at 92% 2%, rgba(88, 211, 200, 0.14), transparent 62%),
    radial-gradient(95% 72% at 2% 100%, rgba(242, 162, 58, 0.11), transparent 58%),
    var(--ink);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 5vw, 46px);
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: center;
    gap: clamp(36px, 5vw, 72px);
  }
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-hero__file {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-hero__text h1 {
  margin: 22px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(29px, 6.4vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ice);
}

.page-about .about-hero__text .lead {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.6vw, 16.5px);
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 28px 0 0;
  padding: 22px 0 0;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
}

@media (min-width: 620px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-hero__facts li {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-hero__v {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--gold);
}

.page-about .about-hero__k {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-l);
  border: 1px solid var(--line-strong);
  box-shadow: 0 34px 66px -38px rgba(0, 0, 0, 0.88);
}

.page-about .about-hero__cap {
  position: absolute;
  left: 16px;
  bottom: 16px;
  padding: 7px 15px;
  border-radius: 999px;
  background: rgba(6, 18, 30, 0.8);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cyan);
}

/* ---------- 长卷骨架 ---------- */
.page-about .about-volume {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(48px, 9vw, 100px);
}

@media (min-width: 1080px) {
  .page-about .about-volume {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 60px);
    align-items: start;
  }
}

/* ---------- 章节索引 ---------- */
.page-about .about-index__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

@media (min-width: 1080px) {
  .page-about .about-index {
    position: sticky;
    top: 48px;
    align-self: start;
  }

  .page-about .about-index__list {
    flex-direction: column;
    gap: 2px;
  }
}

.page-about .about-index__list a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-radius: 999px;
  border: 1px solid transparent;
  font-size: 13px;
  color: var(--mist);
  text-decoration: none;
  transition: color 0.18s ease, background 0.18s ease, border-color 0.18s ease;
}

@media (min-width: 1080px) {
  .page-about .about-index__list a {
    border-radius: var(--radius-s);
    padding: 10px 12px;
  }
}

.page-about .about-index__list a:hover,
.page-about .about-index__list a:focus-visible {
  color: var(--ice);
  background: var(--about-ink-soft);
  border-color: var(--line);
}

.page-about .about-index__list a[aria-current="true"],
.page-about .about-index__list a[aria-current="location"] {
  color: var(--gold);
  background: rgba(242, 162, 58, 0.08);
  border-color: rgba(242, 162, 58, 0.42);
}

.page-about .about-index__n {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--cyan-deep);
}

.page-about .about-index__list a[aria-current="true"] .about-index__n,
.page-about .about-index__list a[aria-current="location"] .about-index__n {
  color: var(--gold);
}

/* ---------- 章节通用 ---------- */
.page-about .chapter {
  position: relative;
  padding: clamp(32px, 6vw, 58px) 0 clamp(32px, 6vw, 66px);
  border-top: 1px solid var(--line);
}

.page-about .chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(180px, 44%);
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(242, 162, 58, 0));
}

.page-about .chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  margin-bottom: 18px;
}

.page-about .chapter__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.4vw, 30px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .chapter__lead {
  margin: 0 0 26px;
  max-width: 70ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .chapter__note {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid rgba(88, 211, 200, 0.42);
  max-width: 70ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

.page-about .chapter__links {
  margin: 26px 0 0;
}

.page-about .sub-head {
  margin: 34px 0 0;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ice);
}

/* ---------- 年份时间轴 ---------- */
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(88, 211, 200, 0.4) 55%, rgba(88, 211, 200, 0));
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 22px 34px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  transition: background 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .timeline__item:hover::before,
.page-about .timeline__item:focus-within::before {
  background: var(--gold);
  border-color: var(--gold);
  box-shadow: 0 0 0 6px rgba(242, 162, 58, 0.16);
}

.page-about .timeline__year {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 68ch;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
  transition: color 0.2s ease;
}

.page-about .timeline__item:hover .timeline__text {
  color: var(--ice);
}

/* ---------- 授权阶梯 ---------- */
.page-about .tiers {
  display: grid;
  gap: 14px;
}

.page-about .tier {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 20px;
  display: grid;
  gap: 12px;
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .tier:hover {
  border-color: rgba(242, 162, 58, 0.38);
  transform: translateY(-3px);
}

@media (min-width: 760px) {
  .page-about .tier {
    grid-template-columns: 140px minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
    gap: 22px;
    padding: 22px 24px;
  }
}

@media (min-width: 980px) {
  .page-about .tiers {
    gap: 16px;
  }

  .page-about .tier--1 {
    width: 76%;
  }

  .page-about .tier--2 {
    width: 84%;
  }

  .page-about .tier--3 {
    width: 92%;
  }

  .page-about .tier--4 {
    width: 100%;
    background: linear-gradient(120deg, rgba(242, 162, 58, 0.12), var(--panel) 62%);
    border-color: rgba(242, 162, 58, 0.34);
  }
}

.page-about .tier__id {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .tier__lv {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan-deep);
}

.page-about .tier__name {
  margin: 0;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.page-about .tier__who {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .tier__gets {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .tier__gets li {
  padding: 6px 13px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(88, 211, 200, 0.07);
  font-size: 12.5px;
  color: var(--cyan);
}

/* ---------- 通用配图 ---------- */
.page-about .about-figure {
  position: relative;
  margin: 30px 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
}

.page-about .about-figure__cap {
  position: absolute;
  left: 14px;
  bottom: 14px;
  padding: 6px 14px;
  border-radius: 999px;
  background: rgba(6, 18, 30, 0.8);
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold-soft);
}

/* ---------- 六区网络 ---------- */
.page-about .regions {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

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

@media (min-width: 1120px) {
  .page-about .regions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .region {
  position: relative;
  padding: 22px 20px 20px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: linear-gradient(180deg, var(--about-ink-soft), rgba(10, 27, 42, 0.9));
  overflow: hidden;
}

.page-about .region::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--region-c, var(--cyan));
  opacity: 0.9;
}

.page-about .region--hd { --region-c: #F2A23A; }
.page-about .region--hn { --region-c: #58D3C8; }
.page-about .region--hb { --region-c: #A9B6BF; }
.page-about .region--hz { --region-c: #6C815B; }
.page-about .region--xn { --region-c: #FFC46B; }
.page-about .region--xb { --region-c: #2A8F8A; }

.page-about .region__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--region-c, var(--cyan));
}

.page-about .region__name {
  margin: 8px 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 900;
  letter-spacing: 0.04em;
  color: var(--ice);
}

.page-about .region__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 赛季节奏 ---------- */
.page-about .seasons {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

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

.page-about .season {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: rgba(16, 42, 60, 0.62);
}

.page-about .season__code {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--gold);
}

.page-about .season__name {
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ice);
}

.page-about .season__weeks {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .season-notes {
  display: grid;
  gap: 10px;
  margin-top: 22px;
}

@media (min-width: 900px) {
  .page-about .season-notes {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

.page-about .season-notes__item {
  margin: 0;
  padding: 16px 18px;
  border-radius: var(--radius-m);
  border: 1px dashed rgba(169, 182, 191, 0.3);
  font-size: 13.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .season-notes__item strong {
  display: block;
  margin-bottom: 6px;
  font-size: 14.5px;
  color: var(--cyan);
  letter-spacing: 0.04em;
}

/* ---------- 资质与生态 ---------- */
.page-about .creds {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .creds {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .cred {
  padding: 22px 20px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line-strong);
  background: rgba(88, 211, 200, 0.05);
}

.page-about .cred--moss {
  border-color: rgba(108, 129, 91, 0.55);
  background: rgba(108, 129, 91, 0.12);
}

.page-about .cred__n {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: 0.02em;
}

.page-about .cred__k {
  display: block;
  margin-top: 8px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ice);
}

.page-about .cred__d {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .eco {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .eco li {
  padding: 9px 17px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: var(--about-ink-soft);
  font-size: 13.5px;
  color: var(--ice);
}

/* ---------- 团队承诺 ---------- */
.page-about .promise {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

@media (min-width: 860px) {
  .page-about .promise {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .promise__item {
  padding: 22px 20px;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--panel);
}

.page-about .promise__v {
  display: block;
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  color: var(--cyan);
  letter-spacing: 0.02em;
}

.page-about .promise__t {
  display: block;
  margin-top: 8px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--ice);
}

.page-about .promise__d {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding-bottom: clamp(48px, 9vw, 100px);
}

.page-about .about-cta__inner {
  padding: clamp(26px, 5vw, 54px);
  border-radius: var(--radius-l);
  border: 1px solid var(--line-strong);
  background:
    radial-gradient(120% 130% at 100% 0%, rgba(242, 162, 58, 0.16), transparent 58%),
    linear-gradient(160deg, #102A3C, #06121E);
}

.page-about .about-cta__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--cyan);
}

.page-about .about-cta__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(21px, 3.6vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--ice);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .about-cta__actions {
  margin-top: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 479px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 16px;
  }

  .page-about .tier__gets li {
    font-size: 12px;
  }

  .page-about .about-cta__actions .btn {
    width: 100%;
    text-align: center;
    justify-content: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tier,
  .page-about .timeline__item::before,
  .page-about .timeline__text,
  .page-about .about-index__list a {
    transition: none;
  }

  .page-about .tier:hover {
    transform: none;
  }
}