.page-about {
  --about-radius: clamp(20px, 3vw, 32px);
  --about-pad: clamp(20px, 4vw, 44px);
  --about-line: rgba(220, 239, 242, 0.16);
  color: var(--ink);
  background: var(--snow);
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  border-radius: 0 0 var(--about-radius) var(--about-radius);
  padding: clamp(24px, 5vw, 56px) var(--edge) clamp(30px, 5vw, 60px);
  color: var(--snow);
  background:
    radial-gradient(120% 120% at 88% 0%, rgba(53, 240, 208, 0.18), transparent 62%),
    linear-gradient(160deg, var(--deep) 0%, var(--indigo) 100%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(220, 239, 242, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(220, 239, 242, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(120% 90% at 70% 8%, #000 18%, transparent 76%);
  mask-image: radial-gradient(120% 90% at 70% 8%, #000 18%, transparent 76%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  max-width: var(--maxw-wide);
  margin: 0 auto;
}

.page-about .about-hero-copy {
  min-width: 0;
}

.page-about .about-hero .breadcrumb {
  margin: 0 0 clamp(14px, 2.5vw, 22px);
  padding: 0;
  color: rgba(220, 239, 242, 0.7);
  font-size: 0.8rem;
}

.page-about .about-hero .breadcrumb a {
  color: rgba(220, 239, 242, 0.86);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--neon);
}

.page-about .about-hero .eyebrow {
  display: block;
  margin: 0 0 10px;
  color: var(--neon);
}

.page-about .about-hero .display-title {
  margin: 0 0 18px;
  color: var(--snow);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.2rem, 7vw, 4.6rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.page-about .about-hero .lede {
  max-width: 58ch;
  margin: 0;
  color: rgba(220, 239, 242, 0.86);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-hero-figure {
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  clip-path: polygon(0 4%, 100% 0, 100% 96%, 0 100%);
  background: linear-gradient(150deg, var(--wine), var(--indigo));
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  max-width: var(--maxw-wide);
  margin: clamp(24px, 4vw, 42px) auto 0;
  padding: 0;
  list-style: none;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--about-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 18px;
  background: rgba(11, 59, 66, 0.78);
}

.page-about .about-stat-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.25rem, 3vw, 1.85rem);
  color: var(--neon);
  letter-spacing: -0.02em;
}

.page-about .about-stat-label {
  font-size: 0.78rem;
  color: rgba(220, 239, 242, 0.72);
}

/* ---------- 外壳与侧边索引 ---------- */
.page-about .about-shell {
  display: grid;
  gap: clamp(20px, 3.5vw, 40px);
  padding-block: clamp(28px, 5vw, 60px);
}

.page-about .about-index {
  display: none;
  align-self: start;
}

.page-about .about-index-title {
  margin: 0 0 14px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-index a {
  display: block;
  padding: 8px 0 8px 12px;
  border-left: 2px solid var(--hair);
  color: var(--slate);
  font-size: 0.86rem;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--deep);
  border-left-color: var(--neon);
}

.page-about .about-index a.is-active {
  color: var(--deep);
  font-weight: 700;
  border-left-color: var(--neon);
  background: linear-gradient(90deg, rgba(53, 240, 208, 0.16), transparent);
}

/* ---------- 章节块 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  min-width: 0;
}

.page-about .about-block {
  position: relative;
  min-width: 0;
  padding: var(--about-pad);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-block .eyebrow {
  display: block;
  margin: 0 0 8px;
  color: var(--slate);
}

.page-about .about-block .section-title {
  margin: 0;
  font-size: clamp(1.55rem, 3.4vw, 2.5rem);
  line-height: 1.12;
  letter-spacing: -0.035em;
}

.page-about .about-block--snow {
  background: var(--paper);
  border: 1px solid var(--hair);
  color: var(--ink);
}

.page-about .about-block--deep {
  background: linear-gradient(165deg, var(--deep) 0%, var(--deep-2) 100%);
  color: var(--snow);
}

.page-about .about-block--indigo {
  background: linear-gradient(170deg, var(--indigo) 0%, #1a1a44 100%);
  color: var(--snow);
}

.page-about .about-block--sand {
  background: var(--sand);
  color: var(--ink);
}

.page-about .about-block--support {
  background: linear-gradient(150deg, var(--deep) 0%, var(--wine) 100%);
  color: var(--snow);
}

.page-about .about-block--deep .eyebrow,
.page-about .about-block--indigo .eyebrow,
.page-about .about-block--support .eyebrow {
  color: var(--neon);
}

.page-about .about-block-head {
  margin-bottom: clamp(16px, 3vw, 28px);
}

/* ---------- 缘起 ---------- */
.page-about .about-story-grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-story-text p {
  margin: 0 0 1.1em;
  font-size: 1rem;
  line-height: 1.8;
  color: #23353a;
}

.page-about .about-story-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-archive {
  padding: clamp(16px, 3vw, 24px);
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--hair);
  border-left: 5px solid var(--wine);
  box-shadow: 0 10px 26px rgba(11, 59, 66, 0.08);
}

.page-about .about-archive-label {
  margin: 0 0 14px;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--wine);
}

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

.page-about .about-archive-list li {
  display: grid;
  gap: 2px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--hair);
}

.page-about .about-archive-list li:last-child {
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-archive-key {
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--slate);
}

.page-about .about-archive-val {
  font-size: 0.94rem;
  line-height: 1.55;
  color: var(--ink);
}

/* ---------- 内容体系 ---------- */
.page-about .about-system-grid {
  display: grid;
  gap: clamp(18px, 3vw, 30px);
}

.page-about .about-tier {
  border: 1px solid var(--about-line);
  border-radius: var(--radius-md);
  background: rgba(220, 239, 242, 0.05);
  overflow: hidden;
}

.page-about .about-tier + .about-tier {
  margin-top: 10px;
}

.page-about .about-tier summary {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 10px;
  padding: 13px 40px 13px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--snow);
}

.page-about .about-tier summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tier summary::after {
  content: "+";
  position: absolute;
  right: 15px;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--neon);
}

.page-about .about-tier[open] summary::after {
  content: "–";
}

.page-about .about-tier[open] {
  background: rgba(220, 239, 242, 0.1);
  border-color: rgba(53, 240, 208, 0.4);
}

.page-about .about-tier-num {
  font-size: 0.78rem;
  color: var(--neon);
}

.page-about .about-tier-name {
  flex: 1 1 8em;
  min-width: 0;
  font-weight: 700;
  font-size: 1rem;
}

.page-about .about-tier-meta {
  font-size: 0.72rem;
  color: rgba(220, 239, 242, 0.62);
}

.page-about .about-tier-body {
  padding: 0 16px 16px;
}

.page-about .about-tier-body p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: rgba(220, 239, 242, 0.82);
}

.page-about .about-system-figure {
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-system-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */
.page-about .about-tl {
  margin: 0;
  padding: 0 0 0 34px;
  list-style: none;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--neon), rgba(53, 240, 208, 0.1));
  border-radius: 2px;
}

.page-about .about-tl-item {
  position: relative;
}

.page-about .about-tl-item + .about-tl-item {
  margin-top: 16px;
}

.page-about .about-tl-mark {
  position: absolute;
  left: -34px;
  top: 18px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 4px rgba(53, 240, 208, 0.18), 0 0 14px rgba(53, 240, 208, 0.55);
}

.page-about .about-tl-card {
  padding: 16px 18px;
  border-radius: var(--radius-md);
  border: 1px solid var(--about-line);
  background: rgba(220, 239, 242, 0.06);
}

.page-about .about-tl-when {
  margin: 0 0 6px;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--neon);
}

.page-about .about-tl-card h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--snow);
}

.page-about .about-tl-card p:last-child {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(220, 239, 242, 0.8);
}

/* ---------- 团队 ---------- */
.page-about .about-team-lede {
  margin: 0 0 clamp(16px, 3vw, 26px);
  max-width: 68ch;
  color: #2b4045;
}

.page-about .about-team-media {
  margin: 0 0 clamp(18px, 3vw, 26px);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.page-about .about-team-media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-team-card {
  padding: 18px;
  border-radius: var(--radius-md);
  background: #fff;
  border: 1px solid var(--hair);
  border-top: 3px solid var(--deep-2);
}

.page-about .about-team-num {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--wine);
}

.page-about .about-team-card h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  color: var(--ink);
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: #3a4c52;
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco-grid {
  display: grid;
  gap: clamp(16px, 3vw, 26px);
}

.page-about .about-eco-sub {
  margin: 0 0 14px;
  font-size: 1rem;
  color: #4a3a22;
}

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

.page-about .about-eco-tag {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 2px 10px;
  padding: 14px 16px;
  border-radius: var(--radius-md);
  background: rgba(247, 251, 250, 0.86);
  border: 1px solid rgba(16, 24, 32, 0.14);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-eco-tag:hover,
.page-about .about-eco-tag:focus-visible {
  transform: translateY(-2px);
  border-color: var(--deep);
  box-shadow: 0 8px 20px rgba(16, 24, 32, 0.12);
}

.page-about .about-eco-num {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--wine);
}

.page-about .about-eco-name {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--ink);
}

.page-about .about-eco-tip {
  grid-column: 1 / -1;
  font-size: 0.8rem;
  line-height: 1.6;
  color: rgba(16, 24, 32, 0.66);
  transition: color 0.2s ease, opacity 0.2s ease;
}

.page-about .about-eco-honor {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius-lg);
  background: var(--wine);
  color: var(--snow);
}

.page-about .about-honor-label {
  margin: 0 0 10px;
  font-size: 1.5rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--neon);
}

.page-about .about-eco-honor h3 {
  margin: 0 0 10px;
  font-size: 1.1rem;
  line-height: 1.4;
}

.page-about .about-eco-honor p:last-child {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: rgba(247, 251, 250, 0.86);
}

/* ---------- 支持 ---------- */
.page-about .about-steps {
  margin: 0 0 clamp(16px, 3vw, 24px);
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .about-step {
  padding: 16px 18px;
  border-radius: var(--radius-md);
  background: rgba(220, 239, 242, 0.1);
  border: 1px solid var(--about-line);
}

.page-about .about-step-num {
  display: inline-block;
  margin-bottom: 6px;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--neon);
}

.page-about .about-step p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: rgba(247, 251, 250, 0.88);
}

.page-about .about-support-note {
  margin: 0 0 clamp(16px, 3vw, 24px);
  font-size: 0.88rem;
  line-height: 1.75;
  color: rgba(247, 251, 250, 0.78);
}

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

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

  .page-about .about-story-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

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

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

  .page-about .about-eco-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    align-items: start;
  }

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

  .page-about .about-eco-tip {
    opacity: 0.55;
  }

  .page-about .about-eco-tag:hover .about-eco-tip,
  .page-about .about-eco-tag:focus-visible .about-eco-tip {
    opacity: 1;
    color: var(--deep);
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: center;
  }

  .page-about .about-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: 84px;
  }

  .page-about .about-tl {
    max-width: 760px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-eco-tag,
  .page-about .about-index a,
  .page-about .about-eco-tip {
    transition: none;
  }

  .page-about .about-eco-tag:hover,
  .page-about .about-eco-tag:focus-visible {
    transform: none;
  }
}
<<<END>>>