.page-about {
  --about-line: var(--line-dark);
  --about-line-paper: var(--line-paper);
  background: var(--paper-50);
  color: var(--slate-700);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-band {
  padding: 48px 0;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about figure {
  margin: 0;
}

.page-about .about-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.15;
}

.page-about p {
  margin: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-mute);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  color: rgba(214, 251, 241, .4);
}

.page-about .breadcrumbs a {
  color: var(--cyan-100);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--tr), color var(--tr);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(circle at 82% 12%, rgba(51, 240, 196, .16), transparent 46%),
    linear-gradient(158deg, var(--field-800) 0%, var(--ink-950) 78%);
  color: var(--cyan-100);
  padding-top: 28px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-400);
  margin-bottom: 14px;
}

.page-about .about-kicker--dark {
  color: var(--teal-600);
}

.page-about .about-hero h1 {
  font-size: clamp(30px, 6.2vw, 46px);
  font-weight: 800;
  line-height: 1.18;
  color: #FFFFFF;
  max-width: 20ch;
}

.page-about .about-lede {
  margin-top: 20px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 60ch;
}

.page-about .about-hero__points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__points li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cyan-100);
}

.page-about .about-hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--amber-500);
}

/* ---------- 概况卡 ---------- */
.page-about .about-glance {
  border: 1px solid var(--about-line);
  background: rgba(4, 28, 24, .42);
  padding: 20px 18px;
  box-shadow: var(--shadow-layer);
}

.page-about .about-glance__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
  margin-bottom: 4px;
}

.page-about .about-glance__list {
  margin: 0;
  padding: 0;
}

.page-about .about-glance__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(51, 240, 196, .16);
}

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

.page-about .about-glance__row dt {
  font-size: 13px;
  color: var(--ink-mute);
}

.page-about .about-glance__row dd {
  margin: 0;
  font-size: 14px;
  color: #FFFFFF;
  text-align: right;
}

.page-about .about-glance__row dd .about-mono {
  color: var(--amber-500);
  font-size: 15px;
}

/* ---------- 段落标题 ---------- */
.page-about .about-head {
  max-width: 68ch;
  margin-bottom: 28px;
}

.page-about .about-head h2 {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  color: var(--ink-950);
}

.page-about .about-head__sub {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: #46554F;
}

.page-about .about-head--inverse h2 {
  color: #FFFFFF;
}

.page-about .about-head--inverse .about-head__sub {
  color: rgba(214, 251, 241, .74);
}

/* ---------- 团队段 ---------- */
.page-about .about-team {
  background: var(--paper-50);
}

.page-about .about-figure {
  margin-bottom: 32px;
  border: 1px solid var(--about-line-paper);
  background: var(--white);
  padding: 8px;
  box-shadow: 8px 8px 0 rgba(46, 59, 57, .10);
}

.page-about .about-figure img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-about .about-figure figcaption {
  padding: 10px 4px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: #5B6A64;
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .team-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--white);
  border: 1px solid var(--about-line-paper);
  border-top: 3px solid var(--teal-600);
  padding: 18px 16px 16px;
  box-shadow: 6px 6px 0 rgba(46, 59, 57, .10);
  transition: transform var(--tr), border-color var(--tr), box-shadow var(--tr);
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-about .team-card__idx {
  font-size: 12px;
  color: var(--amber-500);
  letter-spacing: 0.12em;
}

.page-about .team-card__name {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-950);
}

.page-about .team-card__size {
  font-size: 12px;
  color: var(--teal-600);
}

.page-about .team-card__size .about-mono {
  font-size: 15px;
  font-weight: 700;
}

.page-about .team-card__desc {
  font-size: 14px;
  line-height: 1.7;
  color: #3C4A45;
}

.page-about .team-card__more {
  max-height: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.7;
  color: #5B6A64;
  border-top: 1px dashed transparent;
  padding-top: 0;
  transition: max-height var(--tr-slow), padding-top var(--tr-slow), border-color var(--tr-slow);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--teal-600);
  box-shadow: 8px 8px 0 rgba(16, 107, 91, .18);
}

.page-about .team-card:hover .team-card__more,
.page-about .team-card:focus-within .team-card__more {
  max-height: 220px;
  padding-top: 10px;
  border-top-color: var(--about-line-paper);
}

/* ---------- 版本沿革 ---------- */
.page-about .about-versions {
  background:
    linear-gradient(200deg, var(--indigo-800) 0%, #1A1839 100%);
  color: var(--cyan-100);
}

.page-about .version-layout {
  display: grid;
  gap: 20px;
}

.page-about .version-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .version-rail__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid rgba(51, 240, 196, .28);
  color: var(--cyan-100);
  text-decoration: none;
  font-size: 12px;
  transition: background var(--tr), border-color var(--tr), color var(--tr);
}

.page-about .version-rail__item .about-mono {
  font-size: 12px;
  color: var(--cyan-400);
}

.page-about .version-rail__label {
  font-size: 12px;
  color: rgba(214, 251, 241, .72);
}

.page-about .version-rail__item:hover,
.page-about .version-rail__item:focus-visible {
  background: rgba(51, 240, 196, .12);
  border-color: var(--cyan-400);
  color: #FFFFFF;
}

.page-about .version-rail__item[aria-current="true"] {
  background: rgba(51, 240, 196, .18);
  border-color: var(--cyan-400);
  box-shadow: inset 4px 0 0 var(--cyan-400);
}

.page-about .version-rail__item[aria-current="true"] .version-rail__label {
  color: #FFFFFF;
}

.page-about .version-stack {
  display: grid;
  gap: 16px;
}

.page-about .version-card {
  background: var(--cyan-100);
  color: var(--slate-700);
  border-left: 4px solid var(--cyan-400);
  padding: 20px 18px;
  box-shadow: 8px 8px 0 rgba(4, 28, 24, .30);
  scroll-margin-top: 96px;
}

.page-about .version-card__tag {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--wine-700);
  margin-bottom: 8px;
}

.page-about .version-card__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-950);
  margin-bottom: 12px;
}

.page-about .version-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .version-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: #33443F;
}

.page-about .version-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--teal-600);
}

.page-about .version-card--split {
  display: grid;
  gap: 16px;
}

.page-about .version-card__figure {
  border: 1px solid rgba(46, 59, 57, .2);
  background: #FFFFFF;
  padding: 6px;
}

.page-about .version-card__figure img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .version-card__figure figcaption {
  padding: 8px 2px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: #5B6A64;
}

.page-about .version-card--current {
  background: var(--white);
  border-left-color: var(--amber-500);
}

.page-about .version-card--current .version-card__tag {
  color: var(--amber-500);
  background: var(--ink-950);
  display: inline-block;
  padding: 3px 8px;
}

/* ---------- 比赛日节奏 ---------- */
.page-about .about-day {
  background:
    repeating-linear-gradient(90deg, rgba(51, 240, 196, .05) 0 1px, transparent 1px 64px),
    linear-gradient(180deg, var(--field-800) 0%, var(--ink-950) 100%);
  color: var(--cyan-100);
}

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

.page-about .clock__item {
  position: relative;
  padding: 0 0 0 18px;
  border-left: 2px solid var(--about-line);
}

.page-about .clock__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--ink-950);
  border: 2px solid var(--cyan-400);
  border-radius: 50%;
  transition: background var(--tr), transform var(--tr);
}

.page-about .clock__time {
  font-size: 13px;
  color: var(--amber-500);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.page-about .clock__label {
  font-size: 17px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.page-about .clock__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .clock__item:hover::before,
.page-about .clock__item:focus-within::before {
  background: var(--cyan-400);
  transform: scale(1.25);
}

.page-about .clock__item:hover .clock__text {
  color: #FFFFFF;
}

/* ---------- 兼容测试 ---------- */
.page-about .about-compat {
  background: var(--paper-50);
}

.page-about .compat-grid {
  display: grid;
  gap: 28px;
}

.page-about .compat-body h2 {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  color: var(--ink-950);
  margin-bottom: 16px;
}

.page-about .compat-body > p {
  font-size: 15px;
  line-height: 1.85;
  color: #33443F;
  max-width: 62ch;
}

.page-about .compat-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .compat-list li {
  position: relative;
  padding: 12px 14px 12px 34px;
  background: var(--white);
  border: 1px solid var(--about-line-paper);
  font-size: 14px;
  line-height: 1.75;
  color: #33443F;
}

.page-about .compat-list li::before {
  content: "▚";
  position: absolute;
  left: 12px;
  top: 11px;
  color: var(--teal-600);
  font-size: 13px;
}

.page-about .compat-list .about-mono {
  color: var(--amber-500);
  font-weight: 700;
  font-size: 15px;
}

.page-about .compat-note {
  margin-top: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: #5B6A64;
  padding-left: 14px;
  border-left: 3px solid var(--amber-500);
}

.page-about .text-link {
  color: var(--teal-600);
  text-decoration: none;
  border-bottom: 1px solid var(--teal-600);
  transition: color var(--tr), border-color var(--tr);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--wine-700);
  border-bottom-color: var(--wine-700);
}

.page-about .compat-figure {
  border: 1px solid var(--about-line-paper);
  background: var(--white);
  padding: 8px;
  box-shadow: 8px 8px 0 rgba(46, 59, 57, .12);
}

.page-about .compat-figure img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 25 / 14;
}

.page-about .compat-figure figcaption {
  padding: 10px 4px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: #5B6A64;
}

/* ---------- 交叉复核 ---------- */
.page-about .about-quality {
  background: var(--cyan-100);
}

.page-about .quality-grid {
  display: grid;
  gap: 28px;
}

.page-about .quality-body h2 {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  color: var(--ink-950);
  margin-bottom: 18px;
}

.page-about .quality-body p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--slate-700);
  max-width: 64ch;
  margin-bottom: 14px;
}

.page-about .quality-body p:last-child {
  margin-bottom: 0;
}

.page-about .quality-aside {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .note-tag {
  background: rgba(255, 255, 255, .78);
  border: 1px solid rgba(46, 59, 57, .22);
  border-left: 4px solid var(--wine-700);
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-700);
  transition: background var(--tr), border-left-color var(--tr);
}

.page-about .note-tag:hover {
  background: var(--white);
  border-left-color: var(--amber-500);
}

.page-about .note-tag .about-mono {
  color: var(--wine-700);
  font-weight: 700;
}

/* ---------- 协作生态 ---------- */
.page-about .about-partners {
  background: var(--white);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  background: var(--about-line-paper);
  border: 1px solid var(--about-line-paper);
}

.page-about .partner-item {
  background: var(--white);
  padding: 18px 16px;
  transition: background var(--tr), box-shadow var(--tr);
}

.page-about .partner-item:hover {
  background: var(--paper-50);
  box-shadow: inset 4px 0 0 var(--amber-500);
}

.page-about .partner-item__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-950);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.page-about .partner-item__text {
  font-size: 13px;
  line-height: 1.75;
  color: #5B6A64;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  background: var(--ink-950);
  color: var(--cyan-100);
  padding-bottom: 64px;
}

.page-about .about-cta h2 {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  color: #FFFFFF;
}

.page-about .about-cta__lede {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 58ch;
}

.page-about .cta-links {
  margin-top: 28px;
  display: grid;
  gap: 12px;
}

.page-about .cta-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border: 1px solid var(--about-line);
  background: rgba(10, 59, 50, .55);
  text-decoration: none;
  transition: transform var(--tr), border-color var(--tr), background var(--tr);
}

.page-about .cta-link__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.01em;
}

.page-about .cta-link__text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan-400);
  background: rgba(16, 107, 91, .55);
}

.page-about .cta-link:hover .cta-link__title,
.page-about .cta-link:focus-visible .cta-link__title {
  color: var(--cyan-400);
}

.page-about .cta-link:focus-visible,
.page-about .version-rail__item:focus-visible,
.page-about .team-card:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

/* ---------- 窄屏修正 ---------- */
@media (max-width: 639px) {
  .page-about .team-card__more {
    max-height: none;
    overflow: visible;
    padding-top: 10px;
    border-top-color: var(--about-line-paper);
  }

  .page-about .about-glance__row dd {
    font-size: 13px;
  }

  .page-about .version-rail__item {
    padding: 7px 10px;
  }
}

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .partner-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .cta-links {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .clock {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 20px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-band {
    padding: 80px 0;
  }

  .page-about .about-hero {
    padding-top: 36px;
    padding-bottom: 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.55fr 0.85fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-glance {
    margin-top: 8px;
  }

  .page-about .about-figure {
    margin-bottom: 40px;
  }

  .page-about .version-layout {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .version-rail {
    flex-direction: column;
    gap: 10px;
    overflow: visible;
    padding: 0 0 0 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
    position: sticky;
    top: 96px;
  }

  .page-about .version-rail__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 10px 12px;
    border: 0;
    border-left: 3px solid transparent;
    background: transparent;
  }

  .page-about .version-rail__item:hover,
  .page-about .version-rail__item:focus-visible {
    background: rgba(51, 240, 196, .10);
    border-left-color: var(--cyan-400);
  }

  .page-about .version-rail__item[aria-current="true"] {
    background: rgba(51, 240, 196, .16);
    border-left-color: var(--cyan-400);
    box-shadow: none;
  }

  .page-about .version-card {
    padding: 26px 26px;
  }

  .page-about .version-card--split {
    grid-template-columns: 1.35fr 0.85fr;
    align-items: start;
    gap: 24px;
  }

  .page-about .clock {
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    margin-top: 8px;
  }

  .page-about .clock__item {
    padding: 22px 16px 0 0;
    border-left: 0;
    border-top: 2px solid var(--about-line);
  }

  .page-about .clock__item::before {
    left: 0;
    top: -6px;
  }

  .page-about .clock__item + .clock__item {
    padding-left: 16px;
  }

  .page-about .compat-grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .quality-grid {
    grid-template-columns: minmax(0, 1fr) 258px;
    gap: 48px;
    align-items: start;
  }

  .page-about .partner-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .partner-item {
    padding: 22px 20px;
  }

  .page-about .about-cta {
    padding-bottom: 88px;
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1024px) {
  .page-about .team-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .team-card {
    min-height: 288px;
  }

  .page-about .team-card:nth-child(2) {
    min-height: 264px;
  }

  .page-about .team-card:nth-child(3) {
    min-height: 240px;
  }

  .page-about .team-card:nth-child(4) {
    min-height: 216px;
  }

  .page-about .team-card:nth-child(5) {
    min-height: 192px;
  }
}

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

.page-about {
  --about-line: var(--line-dark);
  --about-line-paper: var(--line-paper);
  background: var(--paper-50);
  color: var(--slate-700);
  font-family: var(--font-body);
  overflow-x: hidden;
}

.page-about .about-band {
  padding: 48px 0;
}

.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
}

.page-about figure {
  margin: 0;
}

.page-about .about-mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  letter-spacing: -0.02em;
  margin: 0;
  line-height: 1.15;
}

.page-about p {
  margin: 0;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
}

.page-about .breadcrumbs li {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: var(--ink-mute);
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  color: rgba(214, 251, 241, .4);
}

.page-about .breadcrumbs a {
  color: var(--cyan-100);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--tr), color var(--tr);
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--cyan-400);
  border-bottom-color: var(--cyan-400);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  background:
    radial-gradient(circle at 82% 12%, rgba(51, 240, 196, .16), transparent 46%),
    linear-gradient(158deg, var(--field-800) 0%, var(--ink-950) 78%);
  color: var(--cyan-100);
  padding-top: 28px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 28px;
}

.page-about .about-kicker {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan-400);
  margin-bottom: 14px;
}

.page-about .about-kicker--dark {
  color: var(--teal-600);
}

.page-about .about-hero h1 {
  font-size: clamp(30px, 6.2vw, 46px);
  font-weight: 800;
  line-height: 1.18;
  color: #FFFFFF;
  max-width: 20ch;
}

.page-about .about-lede {
  margin-top: 20px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 60ch;
}

.page-about .about-hero__points {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-hero__points li {
  position: relative;
  padding-left: 20px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--cyan-100);
}

.page-about .about-hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 8px;
  background: var(--amber-500);
}

/* ---------- 概况卡 ---------- */
.page-about .about-glance {
  border: 1px solid var(--about-line);
  background: rgba(4, 28, 24, .42);
  padding: 20px 18px;
  box-shadow: var(--shadow-layer);
}

.page-about .about-glance__title {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan-400);
  padding-bottom: 12px;
  border-bottom: 1px solid var(--about-line);
  margin-bottom: 4px;
}

.page-about .about-glance__list {
  margin: 0;
  padding: 0;
}

.page-about .about-glance__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding: 11px 0;
  border-bottom: 1px dashed rgba(51, 240, 196, .16);
}

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

.page-about .about-glance__row dt {
  font-size: 13px;
  color: var(--ink-mute);
}

.page-about .about-glance__row dd {
  margin: 0;
  font-size: 14px;
  color: #FFFFFF;
  text-align: right;
}

.page-about .about-glance__row dd .about-mono {
  color: var(--amber-500);
  font-size: 15px;
}

/* ---------- 段落标题 ---------- */
.page-about .about-head {
  max-width: 68ch;
  margin-bottom: 28px;
}

.page-about .about-head h2 {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  color: var(--ink-950);
}

.page-about .about-head__sub {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: #46554F;
}

.page-about .about-head--inverse h2 {
  color: #FFFFFF;
}

.page-about .about-head--inverse .about-head__sub {
  color: rgba(214, 251, 241, .74);
}

/* ---------- 团队段 ---------- */
.page-about .about-team {
  background: var(--paper-50);
}

.page-about .about-figure {
  margin-bottom: 32px;
  border: 1px solid var(--about-line-paper);
  background: var(--white);
  padding: 8px;
  box-shadow: 8px 8px 0 rgba(46, 59, 57, .10);
}

.page-about .about-figure img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 12 / 7;
}

.page-about .about-figure figcaption {
  padding: 10px 4px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: #5B6A64;
}

.page-about .team-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .team-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  background: var(--white);
  border: 1px solid var(--about-line-paper);
  border-top: 3px solid var(--teal-600);
  padding: 18px 16px 16px;
  box-shadow: 6px 6px 0 rgba(46, 59, 57, .10);
  transition: transform var(--tr), border-color var(--tr), box-shadow var(--tr);
}

.page-about .team-card:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

.page-about .team-card__idx {
  font-size: 12px;
  color: var(--amber-500);
  letter-spacing: 0.12em;
}

.page-about .team-card__name {
  font-size: 19px;
  font-weight: 700;
  color: var(--ink-950);
}

.page-about .team-card__size {
  font-size: 12px;
  color: var(--teal-600);
}

.page-about .team-card__size .about-mono {
  font-size: 15px;
  font-weight: 700;
}

.page-about .team-card__desc {
  font-size: 14px;
  line-height: 1.7;
  color: #3C4A45;
}

.page-about .team-card__more {
  max-height: 0;
  overflow: hidden;
  font-size: 13px;
  line-height: 1.7;
  color: #5B6A64;
  border-top: 1px dashed transparent;
  padding-top: 0;
  transition: max-height var(--tr-slow), padding-top var(--tr-slow), border-color var(--tr-slow);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  border-color: var(--teal-600);
  box-shadow: 8px 8px 0 rgba(16, 107, 91, .18);
}

.page-about .team-card:hover .team-card__more,
.page-about .team-card:focus-within .team-card__more {
  max-height: 220px;
  padding-top: 10px;
  border-top-color: var(--about-line-paper);
}

/* ---------- 版本沿革 ---------- */
.page-about .about-versions {
  background:
    linear-gradient(200deg, var(--indigo-800) 0%, #1A1839 100%);
  color: var(--cyan-100);
}

.page-about .version-layout {
  display: grid;
  gap: 20px;
}

.page-about .version-rail {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--about-line);
}

.page-about .version-rail__item {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid rgba(51, 240, 196, .28);
  color: var(--cyan-100);
  text-decoration: none;
  font-size: 12px;
  transition: background var(--tr), border-color var(--tr), color var(--tr);
}

.page-about .version-rail__item .about-mono {
  font-size: 12px;
  color: var(--cyan-400);
}

.page-about .version-rail__label {
  font-size: 12px;
  color: rgba(214, 251, 241, .72);
}

.page-about .version-rail__item:hover,
.page-about .version-rail__item:focus-visible {
  background: rgba(51, 240, 196, .12);
  border-color: var(--cyan-400);
  color: #FFFFFF;
}

.page-about .version-rail__item[aria-current="true"] {
  background: rgba(51, 240, 196, .18);
  border-color: var(--cyan-400);
  box-shadow: inset 4px 0 0 var(--cyan-400);
}

.page-about .version-rail__item[aria-current="true"] .version-rail__label {
  color: #FFFFFF;
}

.page-about .version-stack {
  display: grid;
  gap: 16px;
}

.page-about .version-card {
  background: var(--cyan-100);
  color: var(--slate-700);
  border-left: 4px solid var(--cyan-400);
  padding: 20px 18px;
  box-shadow: 8px 8px 0 rgba(4, 28, 24, .30);
  scroll-margin-top: 96px;
}

.page-about .version-card__tag {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--wine-700);
  margin-bottom: 8px;
}

.page-about .version-card__title {
  font-size: 20px;
  font-weight: 700;
  color: var(--ink-950);
  margin-bottom: 12px;
}

.page-about .version-card__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}

.page-about .version-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.75;
  color: #33443F;
}

.page-about .version-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--teal-600);
}

.page-about .version-card--split {
  display: grid;
  gap: 16px;
}

.page-about .version-card__figure {
  border: 1px solid rgba(46, 59, 57, .2);
  background: #FFFFFF;
  padding: 6px;
}

.page-about .version-card__figure img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .version-card__figure figcaption {
  padding: 8px 2px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: #5B6A64;
}

.page-about .version-card--current {
  background: var(--white);
  border-left-color: var(--amber-500);
}

.page-about .version-card--current .version-card__tag {
  color: var(--amber-500);
  background: var(--ink-950);
  display: inline-block;
  padding: 3px 8px;
}

/* ---------- 比赛日节奏 ---------- */
.page-about .about-day {
  background:
    repeating-linear-gradient(90deg, rgba(51, 240, 196, .05) 0 1px, transparent 1px 64px),
    linear-gradient(180deg, var(--field-800) 0%, var(--ink-950) 100%);
  color: var(--cyan-100);
}

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

.page-about .clock__item {
  position: relative;
  padding: 0 0 0 18px;
  border-left: 2px solid var(--about-line);
}

.page-about .clock__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 6px;
  width: 8px;
  height: 8px;
  background: var(--ink-950);
  border: 2px solid var(--cyan-400);
  border-radius: 50%;
  transition: background var(--tr), transform var(--tr);
}

.page-about .clock__time {
  font-size: 13px;
  color: var(--amber-500);
  letter-spacing: 0.08em;
  margin-bottom: 4px;
}

.page-about .clock__label {
  font-size: 17px;
  font-weight: 700;
  color: #FFFFFF;
  margin-bottom: 6px;
}

.page-about .clock__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .clock__item:hover::before,
.page-about .clock__item:focus-within::before {
  background: var(--cyan-400);
  transform: scale(1.25);
}

.page-about .clock__item:hover .clock__text {
  color: #FFFFFF;
}

/* ---------- 兼容测试 ---------- */
.page-about .about-compat {
  background: var(--paper-50);
}

.page-about .compat-grid {
  display: grid;
  gap: 28px;
}

.page-about .compat-body h2 {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  color: var(--ink-950);
  margin-bottom: 16px;
}

.page-about .compat-body > p {
  font-size: 15px;
  line-height: 1.85;
  color: #33443F;
  max-width: 62ch;
}

.page-about .compat-list {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .compat-list li {
  position: relative;
  padding: 12px 14px 12px 34px;
  background: var(--white);
  border: 1px solid var(--about-line-paper);
  font-size: 14px;
  line-height: 1.75;
  color: #33443F;
}

.page-about .compat-list li::before {
  content: "▚";
  position: absolute;
  left: 12px;
  top: 11px;
  color: var(--teal-600);
  font-size: 13px;
}

.page-about .compat-list .about-mono {
  color: var(--amber-500);
  font-weight: 700;
  font-size: 15px;
}

.page-about .compat-note {
  margin-top: 20px;
  font-size: 14px;
  line-height: 1.8;
  color: #5B6A64;
  padding-left: 14px;
  border-left: 3px solid var(--amber-500);
}

.page-about .text-link {
  color: var(--teal-600);
  text-decoration: none;
  border-bottom: 1px solid var(--teal-600);
  transition: color var(--tr), border-color var(--tr);
}

.page-about .text-link:hover,
.page-about .text-link:focus-visible {
  color: var(--wine-700);
  border-bottom-color: var(--wine-700);
}

.page-about .compat-figure {
  border: 1px solid var(--about-line-paper);
  background: var(--white);
  padding: 8px;
  box-shadow: 8px 8px 0 rgba(46, 59, 57, .12);
}

.page-about .compat-figure img {
  width: 100%;
  object-fit: cover;
  aspect-ratio: 25 / 14;
}

.page-about .compat-figure figcaption {
  padding: 10px 4px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: #5B6A64;
}

/* ---------- 交叉复核 ---------- */
.page-about .about-quality {
  background: var(--cyan-100);
}

.page-about .quality-grid {
  display: grid;
  gap: 28px;
}

.page-about .quality-body h2 {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  color: var(--ink-950);
  margin-bottom: 18px;
}

.page-about .quality-body p {
  font-size: 15px;
  line-height: 1.9;
  color: var(--slate-700);
  max-width: 64ch;
  margin-bottom: 14px;
}

.page-about .quality-body p:last-child {
  margin-bottom: 0;
}

.page-about .quality-aside {
  display: grid;
  gap: 10px;
  align-content: start;
}

.page-about .note-tag {
  background: rgba(255, 255, 255, .78);
  border: 1px solid rgba(46, 59, 57, .22);
  border-left: 4px solid var(--wine-700);
  padding: 12px 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--slate-700);
  transition: background var(--tr), border-left-color var(--tr);
}

.page-about .note-tag:hover {
  background: var(--white);
  border-left-color: var(--amber-500);
}

.page-about .note-tag .about-mono {
  color: var(--wine-700);
  font-weight: 700;
}

/* ---------- 协作生态 ---------- */
.page-about .about-partners {
  background: var(--white);
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  grid-template-columns: 1fr;
  background: var(--about-line-paper);
  border: 1px solid var(--about-line-paper);
}

.page-about .partner-item {
  background: var(--white);
  padding: 18px 16px;
  transition: background var(--tr), box-shadow var(--tr);
}

.page-about .partner-item:hover {
  background: var(--paper-50);
  box-shadow: inset 4px 0 0 var(--amber-500);
}

.page-about .partner-item__name {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--ink-950);
  margin-bottom: 6px;
  letter-spacing: -0.01em;
}

.page-about .partner-item__text {
  font-size: 13px;
  line-height: 1.75;
  color: #5B6A64;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  background: var(--ink-950);
  color: var(--cyan-100);
  padding-bottom: 64px;
}

.page-about .about-cta h2 {
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 800;
  color: #FFFFFF;
}

.page-about .about-cta__lede {
  margin-top: 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
  max-width: 58ch;
}

.page-about .cta-links {
  margin-top: 28px;
  display: grid;
  gap: 12px;
}

.page-about .cta-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border: 1px solid var(--about-line);
  background: rgba(10, 59, 50, .55);
  text-decoration: none;
  transition: transform var(--tr), border-color var(--tr), background var(--tr);
}

.page-about .cta-link__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: -0.01em;
}

.page-about .cta-link__text {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.page-about .cta-link:hover,
.page-about .cta-link:focus-visible {
  transform: translateY(-2px);
  border-color: var(--cyan-400);
  background: rgba(16, 107, 91, .55);
}

.page-about .cta-link:hover .cta-link__title,
.page-about .cta-link:focus-visible .cta-link__title {
  color: var(--cyan-400);
}

.page-about .cta-link:focus-visible,
.page-about .version-rail__item:focus-visible,
.page-about .team-card:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
}

/* ---------- 窄屏修正 ---------- */
@media (max-width: 639px) {
  .page-about .team-card__more {
    max-height: none;
    overflow: visible;
    padding-top: 10px;
    border-top-color: var(--about-line-paper);
  }

  .page-about .about-glance__row dd {
    font-size: 13px;
  }

  .page-about .version-rail__item {
    padding: 7px 10px;
  }
}

/* ---------- 中屏 ---------- */
@media (min-width: 640px) {
  .page-about .team-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .partner-list {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about .cta-links {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .clock {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px 20px;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-band {
    padding: 80px 0;
  }

  .page-about .about-hero {
    padding-top: 36px;
    padding-bottom: 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: 1.55fr 0.85fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .about-glance {
    margin-top: 8px;
  }

  .page-about .about-figure {
    margin-bottom: 40px;
  }

  .page-about .version-layout {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .version-rail {
    flex-direction: column;
    gap: 10px;
    overflow: visible;
    padding: 0;
    border-bottom: 0;
    border-left: 1px solid var(--about-line);
    position: sticky;
    top: 96px;
  }

  .page-about .version-rail__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    padding: 10px 12px;
    border: 0;
    border-left: 3px solid transparent;
    background: transparent;
  }

  .page-about .version-rail__item:hover,
  .page-about .version-rail__item:focus-visible {
    background: rgba(51, 240, 196, .10);
    border-left-color: var(--cyan-400);
  }

  .page-about .version-rail__item[aria-current="true"] {
    background: rgba(51, 240, 196, .16);
    border-left-color: var(--cyan-400);
    box-shadow: none;
  }

  .page-about .version-card {
    padding: 26px;
  }

  .page-about .version-card--split {
    grid-template-columns: 1.35fr 0.85fr;
    align-items: start;
    gap: 24px;
  }

  .page-about .clock {
    grid-template-columns: repeat(5, 1fr);
    gap: 0;
    margin-top: 8px;
  }

  .page-about .clock__item {
    padding: 22px 16px 0 0;
    border-left: 0;
    border-top: 2px solid var(--about-line);
  }

  .page-about .clock__item::before {
    left: 0;
    top: -6px;
  }

  .page-about .clock__item + .clock__item {
    padding-left: 16px;
  }

  .page-about .compat-grid {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 44px;
    align-items: start;
  }

  .page-about .quality-grid {
    grid-template-columns: minmax(0, 1fr) 258px;
    gap: 48px;
    align-items: start;
  }

  .page-about .partner-list {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about .partner-item {
    padding: 22px 20px;
  }

  .page-about .about-cta {
    padding-bottom: 88px;
  }
}

/* ---------- 宽屏 ---------- */
@media (min-width: 1024px) {
  .page-about .team-grid {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .team-card {
    min-height: 288px;
  }

  .page-about .team-card:nth-child(2) {
    min-height: 264px;
  }

  .page-about .team-card:nth-child(3) {
    min-height: 240px;
  }

  .page-about .team-card:nth-child(4) {
    min-height: 216px;
  }

  .page-about .team-card:nth-child(5) {
    min-height: 192px;
  }
}

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