.page-about {
  --about-radius: 22px;
  --about-radius-sm: 14px;
  position: relative;
  display: block;
  width: 100%;
  max-width: var(--yh-shell-w);
  margin: 0 auto;
  padding: clamp(20px, 4vw, 44px) clamp(18px, 4vw, 40px) clamp(60px, 9vw, 120px);
  color: var(--yh-shell);
  font-family: var(--yh-font-body);
  font-size: 16px;
  line-height: 1.8;
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--yh-font-head);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin: 0;
  color: var(--yh-shell);
}

.page-about p {
  margin: 0;
}

.page-about a {
  color: inherit;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumbs {
  margin-bottom: clamp(22px, 4vw, 36px);
  font-family: var(--yh-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--yh-mist);
}

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

.page-about .about-crumbs li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.page-about .about-crumbs li + li::before {
  content: "/";
  color: rgba(168, 243, 236, 0.35);
}

.page-about .about-crumbs a {
  color: var(--yh-glow);
  text-decoration: none;
  transition: color 0.2s var(--yh-ease);
}

.page-about .about-crumbs a:hover {
  color: var(--yh-cyan);
}

.page-about .about-crumbs [aria-current="page"] {
  color: var(--yh-shell);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 54px) 0 clamp(44px, 6vw, 78px);
  border-top: var(--yh-hair);
}

.page-about .about-hero__glow {
  position: absolute;
  top: -30px;
  right: 0;
  width: min(520px, 72vw);
  height: min(520px, 72vw);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(46, 230, 214, 0.2) 0%, rgba(59, 42, 99, 0.14) 46%, transparent 72%);
  filter: blur(10px);
  pointer-events: none;
  animation: about-breathe 6s ease-in-out infinite;
  z-index: 0;
}

@keyframes about-breathe {
  0%, 100% { opacity: 0.5; }
  50% { opacity: 0.95; }
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 52px);
}

.page-about .about-hero__eyebrow {
  display: inline-block;
  font-family: var(--yh-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yh-cyan);
  margin: 0 0 18px;
  padding: 7px 14px;
  border: 1px solid rgba(46, 230, 214, 0.35);
  border-radius: 999px;
  background: rgba(46, 230, 214, 0.06);
}

.page-about .about-hero__title {
  font-size: clamp(30px, 7.2vw, 52px);
  font-weight: 900;
  line-height: 1.14;
  margin: 0 0 20px;
  text-wrap: balance;
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.86);
  max-width: 58ch;
  margin: 0 0 28px;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

.page-about .about-badge {
  position: absolute;
  top: 14px;
  right: 14px;
  z-index: 3;
  display: inline-flex;
  align-items: center;
  gap: 9px;
  padding: 8px 14px;
  border-radius: 999px;
  background: rgba(6, 14, 28, 0.82);
  border: 1px solid rgba(168, 243, 236, 0.24);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  font-size: 12px;
  line-height: 1;
  color: var(--yh-shell);
}

.page-about .about-badge__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--yh-orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.16);
  animation: about-pulse 3.4s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(255, 138, 61, 0.12); }
  50% { box-shadow: 0 0 0 6px rgba(255, 138, 61, 0.22); }
}

.page-about .about-badge__mono {
  color: var(--yh-lime);
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .about-hero__figure {
  position: relative;
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  border: 1px solid rgba(168, 243, 236, 0.18);
  background: linear-gradient(150deg, rgba(18, 44, 79, 0.9), rgba(6, 14, 28, 0.92));
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

/* ---------- 通用图片与标题 ---------- */
.page-about .yh-figure {
  margin: 0;
}

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

.page-about .yh-figure__cap {
  display: block;
  padding: 12px 16px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--yh-mist);
  letter-spacing: 0.02em;
  background: rgba(6, 14, 28, 0.6);
}

.page-about .about-section {
  margin-top: clamp(56px, 9vw, 118px);
}

.page-about .about-head {
  max-width: 700px;
  margin: 0 0 clamp(24px, 4vw, 42px);
}

.page-about .about-head__eyebrow {
  display: block;
  font-family: var(--yh-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yh-cyan);
  margin: 0 0 12px;
}

.page-about .about-head h2 {
  font-size: clamp(24px, 4.8vw, 36px);
  margin: 0 0 14px;
}

.page-about .about-head__lead {
  font-size: 16px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.78);
  margin: 0;
}

/* ---------- 团队 Bento ---------- */
.page-about .team-bento {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .team-card {
  position: relative;
  border-radius: var(--about-radius);
  border: 1px solid rgba(168, 243, 236, 0.14);
  background: linear-gradient(158deg, rgba(18, 44, 79, 0.72), rgba(6, 14, 28, 0.88));
  overflow: hidden;
  transition: border-color 0.3s var(--yh-ease), transform 0.3s var(--yh-ease);
}

.page-about .team-card:hover {
  border-color: rgba(46, 230, 214, 0.5);
  transform: translateY(-3px);
}

.page-about .team-card__head {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 22px 20px;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}

.page-about .team-card__head::-webkit-details-marker {
  display: none;
}

.page-about .team-card__head::marker {
  content: "";
}

.page-about .team-card__num {
  font-size: clamp(24px, 6vw, 30px);
  font-weight: 700;
  color: var(--yh-cyan);
  letter-spacing: -0.02em;
  line-height: 1;
  min-width: 2.2ch;
}

.page-about .team-card__title {
  flex: 1;
  font-family: var(--yh-font-head);
  font-size: 16.5px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--yh-shell);
}

.page-about .team-card__mark {
  position: relative;
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  border-radius: 7px;
  border: 1px solid rgba(168, 243, 236, 0.35);
  transition: border-color 0.3s var(--yh-ease);
}

.page-about .team-card__mark::before,
.page-about .team-card__mark::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  background: var(--yh-cyan);
  transition: opacity 0.3s var(--yh-ease), background 0.3s var(--yh-ease);
}

.page-about .team-card__mark::before {
  width: 10px;
  height: 1.5px;
}

.page-about .team-card__mark::after {
  width: 1.5px;
  height: 10px;
}

.page-about .team-card[open] .team-card__mark {
  border-color: rgba(255, 138, 61, 0.65);
}

.page-about .team-card[open] .team-card__mark::before,
.page-about .team-card[open] .team-card__mark::after {
  background: var(--yh-orange);
}

.page-about .team-card[open] .team-card__mark::after {
  opacity: 0;
}

.page-about .team-card__body {
  margin: 0;
  padding: 0 20px 22px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.74);
  max-width: 62ch;
}

/* ---------- 内容取舍流程 ---------- */
.page-about .about-flow__figure {
  margin: 0 0 clamp(26px, 4vw, 40px);
  border-radius: var(--about-radius);
  border: 1px solid rgba(168, 243, 236, 0.16);
  background: radial-gradient(ellipse at 28% 18%, rgba(46, 230, 214, 0.13), transparent 62%),
              linear-gradient(140deg, rgba(18, 44, 79, 0.85), rgba(6, 14, 28, 0.95));
  overflow: hidden;
}

.page-about .about-flow__figure img {
  opacity: 0.92;
}

.page-about .about-flow__figure .yh-figure__cap {
  background: transparent;
}

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

.page-about .flow-step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 22px 0;
  border-top: 1px solid rgba(168, 243, 236, 0.14);
  align-items: start;
  transition: opacity 0.25s var(--yh-ease);
}

.page-about .flow-step:last-child {
  border-bottom: 1px solid rgba(168, 243, 236, 0.14);
}

.page-about .flow-step__num {
  font-size: 13px;
  font-weight: 700;
  color: var(--yh-lime);
  letter-spacing: 0.1em;
  padding-top: 5px;
}

.page-about .flow-step__body h3 {
  font-size: 18px;
  margin: 0 0 6px;
}

.page-about .flow-step__body p {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.74);
  max-width: 62ch;
}

.page-about .flow-back {
  margin-top: 28px;
  padding: 20px 22px;
  border-radius: var(--about-radius-sm);
  border-left: 2px solid var(--yh-orange);
  background: linear-gradient(90deg, rgba(255, 138, 61, 0.14), rgba(255, 138, 61, 0) 78%);
}

.page-about .flow-back__text {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.84);
  max-width: 64ch;
}

/* ---------- 运营脉络时间轴 ---------- */
.page-about .tl-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
}

.page-about .tl-list::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(180deg, var(--yh-cyan) 0%, var(--yh-orange) 55%, rgba(168, 243, 236, 0.08) 100%);
  opacity: 0.5;
}

.page-about .tl-item {
  position: relative;
  padding: 16px 0;
}

.page-about .tl-item__dot {
  position: absolute;
  left: -28px;
  top: 22px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--yh-abyss);
  border: 1.5px solid var(--yh-cyan);
  box-shadow: 0 0 0 4px rgba(46, 230, 214, 0.12);
}

.page-about .tl-item__tag {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.1em;
  padding: 4px 11px;
  border-radius: 999px;
  background: rgba(184, 241, 77, 0.09);
  color: var(--yh-lime);
  border: 1px solid rgba(184, 241, 77, 0.28);
  margin-bottom: 10px;
}

.page-about .tl-item__content h3 {
  font-size: 18px;
  margin: 0 0 6px;
}

.page-about .tl-item__content p {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.72);
  max-width: 60ch;
}

.page-about .tl-note {
  margin-top: 26px;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--yh-mist);
}

.page-about .tl-note a {
  color: var(--yh-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 230, 214, 0.4);
  transition: border-color 0.2s var(--yh-ease), color 0.2s var(--yh-ease);
}

.page-about .tl-note a:hover {
  color: var(--yh-glow);
  border-bottom-color: var(--yh-glow);
}

/* ---------- 内容合作 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .partner-card {
  position: relative;
  padding: 26px 22px 24px;
  border-radius: var(--about-radius);
  border: 1px solid rgba(168, 243, 236, 0.14);
  background: linear-gradient(160deg, rgba(18, 44, 79, 0.6), rgba(6, 14, 28, 0.9));
  transition: border-color 0.3s var(--yh-ease), transform 0.3s var(--yh-ease);
}

.page-about .partner-card:hover {
  border-color: rgba(255, 138, 61, 0.5);
  transform: translateY(-3px);
}

.page-about .partner-card__num {
  display: block;
  font-size: clamp(26px, 5vw, 32px);
  font-weight: 700;
  color: var(--yh-orange);
  letter-spacing: -0.02em;
  line-height: 1;
  margin-bottom: 12px;
}

.page-about .partner-card h3 {
  font-size: 17px;
  margin: 0 0 8px;
}

.page-about .partner-card p {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(245, 241, 232, 0.72);
}

.page-about .about-link-line {
  margin-top: 26px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.76);
}

.page-about .about-link-line a {
  color: var(--yh-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(46, 230, 214, 0.4);
  transition: border-color 0.2s var(--yh-ease), color 0.2s var(--yh-ease);
}

.page-about .about-link-line a:hover {
  color: var(--yh-glow);
  border-bottom-color: var(--yh-glow);
}

/* ---------- 轻松三段 ---------- */
.page-about .light-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .light-card {
  position: relative;
  padding: 28px 22px 26px;
  border-radius: var(--about-radius);
  border: 1px solid rgba(168, 243, 236, 0.14);
  background: linear-gradient(155deg, rgba(18, 44, 79, 0.78), rgba(6, 14, 28, 0.92));
  overflow: hidden;
  transition: transform 0.3s var(--yh-ease), border-color 0.3s var(--yh-ease);
}

.page-about .light-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--yh-cyan), rgba(46, 230, 214, 0));
}

.page-about .light-card--b::before {
  background: linear-gradient(180deg, var(--yh-orange), rgba(255, 138, 61, 0));
}

.page-about .light-card--c::before {
  background: linear-gradient(180deg, var(--yh-lime), rgba(184, 241, 77, 0));
}

.page-about .light-card:hover {
  border-color: rgba(46, 230, 214, 0.42);
  transform: translateY(-3px);
}

.page-about .light-card__idx {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--yh-mist);
  margin-bottom: 14px;
}

.page-about .light-card h3 {
  font-size: 18px;
  margin: 0 0 8px;
}

.page-about .light-card p {
  font-size: 15px;
  line-height: 1.82;
  color: rgba(245, 241, 232, 0.74);
}

.page-about .light-stats {
  margin-top: clamp(30px, 4.5vw, 46px);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(168, 243, 236, 0.14);
  border: 1px solid rgba(168, 243, 236, 0.14);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .light-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 16px;
  background: rgba(11, 31, 58, 0.76);
}

.page-about .light-stat__num {
  font-size: clamp(19px, 3.4vw, 26px);
  font-weight: 700;
  color: var(--yh-cyan);
  letter-spacing: -0.01em;
  line-height: 1.1;
}

.page-about .light-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--yh-mist);
  letter-spacing: 0.02em;
}

/* ---------- 收束 ---------- */
.page-about .about-closing {
  position: relative;
  margin-top: clamp(56px, 9vw, 118px);
  padding: clamp(24px, 4.5vw, 48px);
  border-radius: clamp(22px, 3.2vw, 32px);
  border: 1px solid rgba(168, 243, 236, 0.18);
  background: linear-gradient(165deg, rgba(59, 42, 99, 0.55), rgba(11, 31, 58, 0.9) 52%, rgba(6, 14, 28, 0.98));
  overflow: hidden;
}

.page-about .about-closing__figure {
  margin: 0 0 clamp(24px, 3.4vw, 34px);
  border-radius: var(--about-radius-sm);
  border: 1px solid rgba(168, 243, 236, 0.14);
  overflow: hidden;
}

.page-about .about-closing__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .about-closing__figure .yh-figure__cap {
  background: rgba(6, 14, 28, 0.5);
}

.page-about .about-closing__eyebrow {
  font-family: var(--yh-font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--yh-cyan);
  margin: 0 0 12px;
}

.page-about .about-closing h2 {
  font-size: clamp(22px, 4.4vw, 32px);
  margin: 0 0 12px;
}

.page-about .about-closing__lead {
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 241, 232, 0.8);
  margin: 0 0 26px;
  max-width: 62ch;
}

.page-about .about-closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 悬停高亮流程 ---------- */
@media (hover: hover) {
  .page-about .flow-list:hover .flow-step {
    opacity: 0.42;
  }
  .page-about .flow-list .flow-step:hover,
  .page-about .flow-list .flow-step:focus-within {
    opacity: 1;
  }
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .light-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .light-stat {
    padding: 24px 18px;
  }
}

@media (min-width: 720px) {
  .page-about .team-bento {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
  .page-about .team-card--a { grid-column: span 7; }
  .page-about .team-card--b { grid-column: span 5; }
  .page-about .team-card--c { grid-column: span 5; }
  .page-about .team-card--d { grid-column: span 7; }

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

@media (min-width: 780px) {
  .page-about .light-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }
  .page-about .light-card--b {
    margin-top: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.06fr) minmax(0, 1fr);
    align-items: center;
    gap: clamp(36px, 4.5vw, 64px);
  }

  .page-about .flow-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 44px);
  }

  .page-about .flow-step:nth-child(2) {
    border-top-color: transparent;
  }
  .page-about .flow-step:nth-child(4) {
    border-bottom: 1px solid rgba(168, 243, 236, 0.14);
  }

  .page-about .tl-list {
    padding-left: 44px;
  }
  .page-about .tl-list::before {
    left: 7px;
  }
  .page-about .tl-item {
    padding: 20px 0;
  }
  .page-about .tl-item__dot {
    left: -44px;
    top: 26px;
    width: 15px;
    height: 15px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero__glow,
  .page-about .about-badge__dot {
    animation: none;
  }
  .page-about [data-reveal],
  .page-about .team-card,
  .page-about .partner-card,
  .page-about .light-card {
    transition: none;
  }
}