.page-about {
  --about-line: rgba(127, 247, 228, 0.14);
  --about-line-soft: rgba(141, 163, 184, 0.2);
  --about-panel: rgba(233, 244, 255, 0.05);
  position: relative;
  overflow-x: clip;
  background: var(--void);
  color: var(--text-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--header-h) + clamp(36px, 6vw, 88px)) 0 clamp(48px, 7vw, 96px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% auto -12%;
  height: 130%;
  pointer-events: none;
  background:
    radial-gradient(52% 46% at 12% 8%, rgba(33, 230, 193, 0.16), transparent 68%),
    radial-gradient(42% 42% at 88% 2%, rgba(255, 181, 71, 0.09), transparent 70%),
    linear-gradient(180deg, rgba(11, 33, 56, 0.6), transparent 72%);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: 1040px;
}

.page-about .about-crumb {
  margin-bottom: clamp(24px, 4vw, 44px);
}

.page-about .about-hero__title {
  display: flex;
  flex-direction: column;
  margin: 0 0 clamp(20px, 3vw, 30px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(50px, 9.4vw, 116px);
  line-height: 0.92;
  letter-spacing: -0.025em;
  color: var(--text-title);
}

.page-about .about-hero__line {
  display: block;
}

.page-about .about-hero__line--alt {
  color: var(--accent);
}

.page-about .about-hero__lede {
  max-width: 38em;
  color: var(--text-body);
}

.page-about .about-hero__actions {
  margin-top: clamp(22px, 3vw, 34px);
}

.page-about .side-note {
  position: absolute;
  right: clamp(10px, 2.2vw, 30px);
  top: 34%;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.42em;
  text-transform: uppercase;
  color: rgba(141, 163, 184, 0.6);
  pointer-events: none;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 26px);
  margin: clamp(36px, 6vw, 72px) 0 0;
  padding: clamp(24px, 4vw, 40px) 0 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-stat {
  position: relative;
  padding-left: 16px;
}

.page-about .about-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  bottom: 4px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), rgba(33, 230, 193, 0.05));
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.1;
  letter-spacing: 0.01em;
  color: var(--text-title);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  max-width: 22em;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
}

/* ---------- 斜向色带过渡 ---------- */
.page-about .about-slash {
  height: clamp(40px, 6vw, 92px);
  pointer-events: none;
  background: linear-gradient(
    100deg,
    transparent 0 24%,
    rgba(33, 230, 193, 0.1) 24% 55%,
    rgba(33, 230, 193, 0.03) 55% 70%,
    transparent 70%
  );
}

.page-about .about-slash--flip {
  background: linear-gradient(
    260deg,
    transparent 0 28%,
    rgba(127, 247, 228, 0.08) 28% 60%,
    transparent 60%
  );
}

/* ---------- 章节外壳 ---------- */
.page-about .about-chapter {
  position: relative;
  padding-block: clamp(52px, 7.5vw, 112px);
}

.page-about .about-chapter .chapter-head {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(10px, 2vw, 18px);
  margin-bottom: clamp(30px, 4.6vw, 60px);
}

.page-about .about-chapter .chapter-num {
  position: relative;
  display: block;
  padding-left: clamp(10px, 2vw, 22px);
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(62px, 10vw, 126px);
  line-height: 0.76;
  letter-spacing: -0.04em;
  color: rgba(33, 230, 193, 0.15);
  -webkit-text-stroke: 1px rgba(33, 230, 193, 0.42);
}

.page-about .about-chapter .chapter-num::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.14em;
  bottom: 0.16em;
  width: 3px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--accent), rgba(33, 230, 193, 0.04));
}

.page-about .about-chapter .chapter-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(28px, 4.2vw, 50px);
  line-height: 1.1;
  letter-spacing: -0.015em;
  color: var(--text-title);
}

.page-about .about-chapter .chapter-sub {
  margin: clamp(10px, 1.6vw, 16px) 0 0;
  max-width: 34em;
  font-size: clamp(15px, 1.25vw, 17px);
  line-height: 1.85;
  color: var(--text-body);
}

/* ---------- 01 我们做什么 ---------- */
.page-about .about-narrative {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  max-width: 44em;
}

.page-about .about-narrative p {
  margin: 0;
  font-size: clamp(15.5px, 1.3vw, 17.5px);
  line-height: 1.9;
  color: var(--text-body);
}

.page-about .about-narrative p:first-child {
  font-size: clamp(17px, 1.6vw, 20px);
  color: var(--text-title);
}

.page-about .about-scenes {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 22px);
  margin-top: clamp(30px, 4.4vw, 52px);
}

.page-about .about-scene {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  background: linear-gradient(155deg, rgba(11, 33, 56, 0.92), rgba(6, 20, 38, 0.7));
  transition: transform 0.3s ease, border-color 0.3s ease;
}

.page-about .about-scene:hover {
  transform: translateY(-4px);
  border-color: rgba(33, 230, 193, 0.4);
}

.page-about .about-scene__idx {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  border: 1px solid rgba(33, 230, 193, 0.45);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--accent);
}

.page-about .about-scene__title {
  margin: 16px 0 8px;
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-title);
}

.page-about .about-scene__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-body);
}

.page-about .about-inline-link {
  margin: clamp(28px, 4vw, 44px) 0 0;
  max-width: 42em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text-mute);
}

/* ---------- 02 版本演进 ---------- */
.page-about .about-version-banner {
  margin: 0 0 clamp(30px, 4.4vw, 52px);
}

.page-about .about-timeline {
  position: relative;
  max-width: 880px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, rgba(33, 230, 193, 0.55), rgba(33, 230, 193, 0.05));
}

.page-about .about-tl-item {
  position: relative;
  padding: 0 0 clamp(30px, 4.4vw, 52px) clamp(30px, 4vw, 46px);
}

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

.page-about .about-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 6px rgba(33, 230, 193, 0.08);
}

.page-about .about-tl-mark {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .about-tl-title {
  margin: 12px 0 10px;
  font-size: clamp(19px, 2.1vw, 25px);
  font-weight: 700;
  line-height: 1.4;
  color: var(--text-title);
}

.page-about .about-tl-text {
  margin: 0;
  max-width: 36em;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--text-body);
}

.page-about .about-tl-item .disclosure {
  margin-top: 14px;
  max-width: 36em;
}

.page-about .about-archive-note {
  max-width: 42em;
  margin: clamp(30px, 4.4vw, 48px) 0 0;
  padding: clamp(18px, 2.6vw, 26px) clamp(18px, 2.6vw, 28px);
  border-left: 2px solid var(--accent);
  border-radius: 0 var(--radius-s) var(--radius-s) 0;
  background: linear-gradient(100deg, rgba(33, 230, 193, 0.08), rgba(33, 230, 193, 0));
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--text-body);
}

/* ---------- 03 服务范围 ---------- */
.page-about .about-coverage {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-coverage__text {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15.5px, 1.3vw, 17px);
  line-height: 1.88;
  color: var(--text-body);
}

.page-about .about-grid-map {
  display: flex;
  flex-wrap: wrap;
  gap: clamp(10px, 1.6vw, 18px);
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: clamp(18px, 2.6vw, 30px);
  list-style: none;
  border: 1px solid var(--about-line);
  border-radius: var(--radius-l);
  background:
    linear-gradient(150deg, rgba(11, 33, 56, 0.88), rgba(6, 20, 38, 0.55)),
    repeating-linear-gradient(90deg, rgba(127, 247, 228, 0.05) 0 1px, transparent 1px 42px),
    repeating-linear-gradient(0deg, rgba(127, 247, 228, 0.05) 0 1px, transparent 1px 42px);
}

.page-about .about-node {
  position: relative;
  width: clamp(34px, 4.6vw, 52px);
  height: clamp(34px, 4.6vw, 52px);
  border-radius: 50%;
  border: 1px solid rgba(127, 247, 228, 0.22);
  background: rgba(127, 247, 228, 0.05);
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .about-node.is-partner {
  border-color: var(--accent);
  background: radial-gradient(circle at 50% 55%, rgba(33, 230, 193, 0.62), rgba(33, 230, 193, 0.1) 72%);
  box-shadow: 0 0 0 5px rgba(33, 230, 193, 0.07);
}

.page-about .about-node:focus-visible {
  outline: 2px solid var(--accent-soft);
  outline-offset: 3px;
}

.page-about .about-node:hover,
.page-about .about-node:focus-visible {
  transform: translateY(-3px);
}

.page-about .about-node__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  z-index: 5;
  width: max-content;
  max-width: 180px;
  padding: 6px 11px;
  border-radius: 999px;
  font-family: var(--font-body);
  font-size: 12px;
  line-height: 1.4;
  text-align: center;
  color: var(--void);
  background: var(--accent);
  opacity: 0;
  transform: translate(-50%, 6px);
  pointer-events: none;
  transition: opacity 0.22s ease, transform 0.22s ease;
}

.page-about .about-node:hover .about-node__tip,
.page-about .about-node:focus-visible .about-node__tip {
  opacity: 1;
  transform: translate(-50%, 0);
}

.page-about .about-map-legend {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  margin: 16px 0 0;
  max-width: 34em;
  font-size: 13px;
  line-height: 1.7;
  color: var(--text-mute);
}

.page-about .about-map-legend__dot {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  margin-top: 5px;
  border-radius: 50%;
  border: 1px solid var(--accent);
  background: radial-gradient(circle at 50% 50%, rgba(33, 230, 193, 0.7), rgba(33, 230, 193, 0.1));
}

/* ---------- 04 团队与分工 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2.2vw, 24px);
}

.page-about .about-team-card {
  padding: clamp(22px, 3vw, 34px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, rgba(233, 244, 255, 0.07), rgba(233, 244, 255, 0.015));
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  transition: transform 0.3s ease, border-color 0.3s ease, background 0.3s ease;
}

.page-about .about-team-card:hover {
  transform: translateY(-4px);
  border-color: rgba(33, 230, 193, 0.38);
  background: linear-gradient(160deg, rgba(33, 230, 193, 0.1), rgba(233, 244, 255, 0.02));
}

.page-about .about-team-card__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(38px, 5vw, 58px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text-title);
}

.page-about .about-team-card__label {
  margin: 14px 0 8px;
  font-size: clamp(16px, 1.5vw, 18px);
  font-weight: 700;
  color: var(--accent);
}

.page-about .about-team-card__text {
  margin: 0;
  min-height: 4.4em;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--text-body);
}

.page-about .about-team-bar {
  margin-top: 18px;
  height: 4px;
  border-radius: 999px;
  background: rgba(127, 247, 228, 0.12);
  overflow: hidden;
}

.page-about .about-team-bar > i {
  display: block;
  height: 100%;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), rgba(33, 230, 193, 0.3));
}

.page-about .about-team-notes {
  margin-top: clamp(24px, 3.4vw, 40px);
  max-width: 46em;
}

.page-about .about-team-notes p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.88;
  color: var(--text-body);
}

/* ---------- 05 协作生态 ---------- */
.page-about .about-eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-eco__body {
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
}

.page-about .about-eco__text {
  margin: 0;
  max-width: 36em;
  font-size: clamp(15.5px, 1.3vw, 17px);
  line-height: 1.88;
  color: var(--text-body);
}

.page-about .about-eco__stats {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(14px, 2vw, 20px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-eco__stat {
  padding: clamp(16px, 2.2vw, 22px) clamp(16px, 2.2vw, 24px);
  border: 1px solid var(--about-line);
  border-radius: var(--radius-s);
  background: rgba(11, 33, 56, 0.6);
}

.page-about .about-eco__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(24px, 3vw, 34px);
  line-height: 1.1;
  color: var(--accent);
}

.page-about .about-eco__cap {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--text-mute);
}

/* ---------- 06 服务承诺 ---------- */
.page-about .about-promise {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line);
}

.page-about .about-promise li {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(18px, 2.6vw, 28px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-promise__k {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--accent);
}

.page-about .about-promise__v {
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--text-body);
}

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: clamp(18px, 3vw, 36px);
  margin-top: clamp(32px, 5vw, 56px);
  padding: clamp(24px, 3.6vw, 44px);
  border-radius: var(--radius-l);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 2.8vw, 32px);
  line-height: 1.2;
  color: var(--text-title);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text-body);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-promise li {
    grid-template-columns: minmax(140px, 0.26fr) minmax(0, 1fr);
    gap: clamp(16px, 3vw, 40px);
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-chapter .chapter-head {
    grid-template-columns: minmax(120px, 0.24fr) minmax(0, 1fr);
    column-gap: clamp(24px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-eco {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 0.84fr);
    align-items: center;
  }

  .page-about .about-eco__figure {
    order: 2;
  }
}

@media (max-width: 899px) {
  .page-about .side-note {
    display: none;
  }

  .page-about .about-node__tip {
    max-width: 132px;
    font-size: 11px;
  }
}

@media (max-width: 560px) {
  .page-about .about-hero__title {
    font-size: clamp(44px, 15vw, 68px);
  }

  .page-about .about-cta {
    flex-direction: column;
    align-items: stretch;
  }

  .page-about .about-cta .btn-row {
    width: 100%;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
  }

  .page-about .about-scene:hover,
  .page-about .about-team-card:hover,
  .page-about .about-node:hover,
  .page-about .about-node:focus-visible {
    transform: none;
  }
}