.page-about {
  --about-toc-w: 208px;
  --about-soft: rgba(234, 247, 241, 0.8);
  --about-dim: rgba(234, 247, 241, 0.66);
  background: var(--green-900);
  color: var(--paper);
  font-family: var(--font-body);
}

/* ---------- 首屏：品牌特刊封面 ---------- */
.page-about .about-masthead {
  position: relative;
  overflow: hidden;
  padding: clamp(1.5rem, 5vw, 3rem) 0 clamp(2.2rem, 6vw, 4rem);
  border-bottom: 1px solid var(--line);
  background:
    radial-gradient(120% 90% at 88% -10%, rgba(67, 245, 181, 0.16), transparent 62%),
    linear-gradient(168deg, var(--green-850) 0%, var(--green-900) 74%);
}

.page-about .about-masthead::after {
  content: "";
  position: absolute;
  inset: auto -10% -45% 38%;
  height: 62%;
  background: radial-gradient(closest-side, rgba(169, 247, 220, 0.1), transparent 72%);
  clip-path: polygon(0 42%, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.6rem);
  margin-top: clamp(1.1rem, 3vw, 1.9rem);
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about h1 {
  margin: 0.7rem 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.1rem, 6.4vw, 4.1rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .about-lead {
  margin: 1rem 0 0;
  max-width: 62ch;
  font-size: clamp(0.98rem, 1.6vw, 1.06rem);
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.5rem;
}

.page-about .about-facts {
  padding: 1.1rem 1.15rem 1.25rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(18, 63, 51, 0.9), rgba(12, 42, 33, 0.92));
}

.page-about .facts-title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .facts-list {
  margin: 0.8rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .facts-list li {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0.55rem 0;
  border-top: 1px dashed var(--line);
}

.page-about .facts-list li:first-child {
  border-top: 0;
}

.page-about .facts-num {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  line-height: 1;
  color: var(--accent);
}

.page-about .facts-label {
  font-size: 0.78rem;
  color: var(--steel);
  text-align: right;
  line-height: 1.5;
}

/* ---------- 正文两栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(1.5rem, 4vw, 3rem);
  padding-top: clamp(1.8rem, 5vw, 3.2rem);
  padding-bottom: clamp(2.2rem, 6vw, 3.6rem);
}

.page-about .about-toc {
  padding: 0.9rem 1rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: rgba(12, 42, 33, 0.72);
}

.page-about .toc-title {
  margin: 0;
  font-family: var(--font-editorial);
  font-size: 0.86rem;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.page-about .toc-list {
  display: flex;
  gap: 0.4rem;
  overflow-x: auto;
  margin: 0.7rem 0 0;
  padding: 0 0 0.35rem;
  list-style: none;
}

.page-about .toc-list li {
  flex: 0 0 auto;
}

.page-about .toc-link {
  display: flex;
  align-items: baseline;
  gap: 0.42rem;
  padding: 0.35rem 0.55rem;
  border-radius: var(--radius-sm);
  font-size: 0.86rem;
  color: var(--steel);
  text-decoration: none;
  white-space: nowrap;
  transition: color 220ms ease, background-color 220ms ease;
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--mint);
  background: rgba(67, 245, 181, 0.09);
}

.page-about .toc-link[aria-current="true"] {
  color: var(--accent);
  background: rgba(67, 245, 181, 0.14);
}

.page-about .toc-idx {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--steel);
}

.page-about .toc-link[aria-current="true"] .toc-idx {
  color: var(--accent);
}

.page-about .toc-contact {
  display: inline-block;
  margin-top: 0.8rem;
  padding-top: 0.7rem;
  width: 100%;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--mint);
  text-decoration: none;
}

.page-about .toc-contact:hover,
.page-about .toc-contact:focus-visible {
  color: var(--accent);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-bottom: clamp(1.9rem, 4.5vw, 2.8rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-section + .about-section {
  padding-top: clamp(1.8rem, 4.5vw, 2.6rem);
}

.page-about .sec-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about h2 {
  margin: 0.5rem 0 0.9rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.45rem, 3.3vw, 2.3rem);
  line-height: 1.14;
  color: var(--paper);
}

.page-about h3 {
  margin: 0.3rem 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .about-stream p {
  margin: 0 0 0.9rem;
  font-size: 0.97rem;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-stream a {
  color: var(--mint);
  text-decoration: underline;
  text-decoration-color: rgba(169, 247, 220, 0.4);
  text-underline-offset: 3px;
}

.page-about .about-stream a:hover,
.page-about .about-stream a:focus-visible {
  color: var(--accent);
}

.page-about .about-figure {
  margin: 1.3rem 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  object-fit: cover;
  background: var(--green-800);
}

.page-about .about-figure figcaption {
  margin-top: 0.55rem;
  font-size: 0.78rem;
  line-height: 1.65;
  color: var(--steel);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  display: grid;
  gap: 0.9rem;
  margin: 1.5rem 0 1.2rem;
  padding: 0;
  list-style: none;
}

.page-about .timeline-item {
  position: relative;
  padding: 1rem 0.9rem 0.9rem;
  border-top: 2px solid var(--line-strong);
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
  background: linear-gradient(180deg, rgba(18, 63, 51, 0.6), rgba(12, 42, 33, 0.18));
}

.page-about .timeline-item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0.9rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 3px rgba(8, 35, 28, 0.92);
}

.page-about .timeline-item.is-current {
  border-top-color: var(--accent);
  background: linear-gradient(180deg, rgba(67, 245, 181, 0.12), rgba(12, 42, 33, 0.3));
}

.page-about .timeline-item.is-current::before {
  background: var(--accent);
}

.page-about .timeline-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 1rem;
  color: var(--mint);
}

.page-about .timeline-item.is-current .timeline-year {
  color: var(--accent);
}

.page-about .timeline-item h3 {
  font-size: 0.97rem;
  margin-top: 0.25rem;
}

.page-about .timeline-item p {
  margin: 0.4rem 0 0;
  font-size: 0.81rem;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 方法 ---------- */
.page-about .method-split {
  display: grid;
  gap: 1.2rem;
}

.page-about .method-list {
  display: grid;
  gap: 0.65rem;
  margin: 1.1rem 0 0;
}

.page-about .method-list > div {
  position: relative;
  padding: 0.75rem 0.9rem 0.8rem 1.15rem;
  border-radius: var(--radius-sm);
  background: rgba(18, 63, 51, 0.5);
}

.page-about .method-list > div::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.7rem;
  bottom: 0.7rem;
  width: 3px;
  border-radius: 3px;
  background: var(--accent);
  opacity: 0.85;
}

.page-about .method-list dt {
  font-weight: 600;
  font-size: 0.94rem;
  color: var(--paper);
}

.page-about .method-list dd {
  margin: 0.28rem 0 0;
  font-size: 0.85rem;
  line-height: 1.72;
  color: var(--about-dim);
}

.page-about .rhythm-row {
  display: grid;
  gap: 0.75rem;
  margin: 1.3rem 0 1.2rem;
}

.page-about .rhythm {
  padding: 0.9rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(12, 42, 33, 0.85);
}

.page-about .rhythm-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.65rem;
  line-height: 1;
  color: var(--accent);
}

.page-about .rhythm-unit {
  margin-left: 0.28rem;
  font-size: 0.78rem;
  color: var(--mint);
}

.page-about .rhythm p {
  margin: 0.42rem 0 0;
  font-size: 0.79rem;
  line-height: 1.6;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .role-map {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
  gap: 0.75rem;
  margin-top: 1.3rem;
}

.page-about .role-node {
  padding: 0.95rem 0.95rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(170deg, rgba(18, 63, 51, 0.7), rgba(12, 42, 33, 0.6));
}

.page-about .role-node--main {
  border-color: var(--line-strong);
  background: linear-gradient(160deg, rgba(67, 245, 181, 0.16), rgba(12, 42, 33, 0.88));
}

.page-about .role-count {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.85rem;
  line-height: 1;
  color: var(--accent);
}

.page-about .role-name {
  display: block;
  margin-top: 0.35rem;
  font-weight: 600;
  font-size: 0.93rem;
  color: var(--paper);
}

.page-about .role-node p {
  margin: 0.45rem 0 0;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 横向主题带 ---------- */
.page-about .about-band {
  position: relative;
  overflow: hidden;
  margin: clamp(1.4rem, 4vw, 2.2rem) 0;
  padding: clamp(1.3rem, 3.4vw, 2rem);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, rgba(18, 63, 51, 0.96), rgba(7, 12, 10, 0.96));
}

.page-about .about-band::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(70% 120% at 100% 0, rgba(67, 245, 181, 0.18), transparent 70%);
  clip-path: polygon(48% 0, 100% 0, 100% 100%, 22% 100%);
  pointer-events: none;
}

.page-about .band-title,
.page-about .band-lead,
.page-about .band-grid {
  position: relative;
  z-index: 1;
}

.page-about .band-title {
  margin: 0;
}

.page-about .band-lead {
  margin: 0.15rem 0 1.1rem;
  max-width: 58ch;
  font-size: 0.93rem;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .band-grid {
  display: grid;
  gap: 0.7rem;
}

.page-about .band-item {
  display: block;
  padding: 0.95rem 1rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(7, 12, 10, 0.55);
  color: var(--paper);
  text-decoration: none;
  transition: transform 260ms ease, border-color 260ms ease, background-color 260ms ease;
}

.page-about .band-item:hover,
.page-about .band-item:focus-visible {
  transform: translateY(-3px);
  border-color: var(--accent);
  background: rgba(18, 63, 51, 0.72);
}

.page-about .band-idx {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--accent);
}

.page-about .band-item h3 {
  font-size: 1rem;
  margin-top: 0.3rem;
}

.page-about .band-item p {
  margin: 0.4rem 0 0.7rem;
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .band-go {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--mint);
}

.page-about .band-item:hover .band-go,
.page-about .band-item:focus-visible .band-go {
  color: var(--accent);
}

/* ---------- 服务场景 ---------- */
.page-about .scene-grid {
  display: grid;
  gap: 0.7rem;
  margin-top: 1.2rem;
}

.page-about .scene {
  padding: 0.9rem 1rem 1rem;
  border-left: 3px solid rgba(67, 245, 181, 0.55);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  background: rgba(18, 63, 51, 0.42);
}

.page-about .scene h3 {
  font-size: 0.95rem;
}

.page-about .scene p {
  margin: 0.35rem 0 0;
  font-size: 0.83rem;
  line-height: 1.72;
  color: var(--about-dim);
}

/* ---------- 合作与认可 ---------- */
.page-about .honor-list {
  display: grid;
  gap: 0.65rem;
  margin: 1.2rem 0;
}

.page-about .honor {
  display: flex;
  align-items: baseline;
  gap: 0.8rem;
  padding: 0.75rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background: rgba(12, 42, 33, 0.78);
}

.page-about .honor-year {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent);
}

.page-about .honor p {
  margin: 0;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--about-dim);
}

/* ---------- 收束 ---------- */
.page-about .about-close {
  margin-top: clamp(1.8rem, 4.5vw, 2.6rem);
  padding: clamp(1.3rem, 3.6vw, 2.2rem);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(140deg, rgba(67, 245, 181, 0.14), rgba(12, 42, 33, 0.92) 58%);
}

.page-about .about-close h2 {
  margin-top: 0;
}

.page-about .about-close p {
  margin: 0 0 1.2rem;
  max-width: 62ch;
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--about-soft);
}

.page-about .close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .rhythm-row {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 820px) {
  .page-about .timeline {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 0.65rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(240px, 0.85fr);
    align-items: end;
  }

  .page-about .method-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.82fr);
    gap: clamp(1.2rem, 3vw, 2rem);
    align-items: start;
  }

  .page-about .method-figure {
    margin-top: 0.2rem;
  }

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

  .page-about .honor {
    flex-direction: column;
    gap: 0.35rem;
    align-items: flex-start;
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
  }

  .page-about .toc-list {
    display: block;
    overflow: visible;
    padding: 0;
  }

  .page-about .toc-list li + li {
    margin-top: 0.3rem;
  }

  .page-about .toc-link {
    white-space: normal;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .band-item,
  .page-about .toc-link {
    transition: none;
  }

  .page-about .band-item:hover,
  .page-about .band-item:focus-visible {
    transform: none;
  }
}