.page-about {
  --about-hair: 1px solid rgba(18, 23, 22, 0.14);
  --about-hair-strong: 1px solid rgba(18, 23, 22, 0.3);
  --about-soft: rgba(18, 23, 22, 0.74);
}

.page-about .about-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 44px);
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(26px, 4vw, 46px);
  align-items: center;
}

.page-about .about-hero__copy h1 {
  margin: 12px 0 16px;
  font-size: clamp(1.9rem, 6.4vw, 3.5rem);
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-hero__copy .lede {
  max-width: 46ch;
  color: var(--about-soft);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero__visual {
  margin: 0;
}

.page-about .about-hero__visual .figure__img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 16 / 10;
  object-fit: cover;
  border-radius: var(--radius-lg);
  border: var(--about-hair);
}

.page-about .about-strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(18, 23, 22, 0.14);
  border: var(--about-hair);
  border-radius: var(--radius-md);
  overflow: hidden;
  margin-bottom: clamp(28px, 5vw, 56px);
}

.page-about .about-strip__cell {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--paper-white);
}

.page-about .about-strip__value {
  font-family: var(--font-mono);
  font-size: clamp(1.15rem, 3.4vw, 1.5rem);
  font-weight: 700;
  color: var(--flame);
  letter-spacing: -0.02em;
  line-height: 1.1;
}

.page-about .about-strip__label {
  font-size: 0.76rem;
  line-height: 1.4;
  color: var(--about-soft);
}

/* 章节轨道 */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 56px);
  align-items: start;
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 8px;
  list-style: none;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  padding: 8px 14px;
  border: var(--about-hair);
  border-radius: 999px;
  background: var(--paper-white);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail__index {
  color: var(--flame-deep);
  font-weight: 700;
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--ink);
  outline: none;
}

.page-about .about-rail__link.is-active,
.page-about .about-rail__link[aria-current="true"] {
  background: var(--ink-green);
  border-color: var(--ink-green);
  color: var(--paper);
}

.page-about .about-rail__link.is-active .about-rail__index,
.page-about .about-rail__link[aria-current="true"] .about-rail__index {
  color: var(--lime);
}

/* 正文 */
.page-about .about-section {
  padding: clamp(26px, 4vw, 44px) 0;
  border-top: var(--about-hair);
}

.page-about .about-body > .about-section:first-child {
  border-top: 0;
  padding-top: 4px;
}

.page-about .about-section h2 {
  margin: 0 0 14px;
  font-size: clamp(1.45rem, 3.6vw, 2.2rem);
  line-height: 1.16;
  letter-spacing: -0.015em;
  font-weight: 900;
  color: var(--ink);
}

.page-about .about-section h3 {
  margin: 0 0 6px;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-section p {
  margin: 0 0 14px;
  line-height: 1.78;
  color: var(--about-soft);
}

.page-about .about-figure {
  margin: 24px 0;
}

.page-about .about-figure .figure__img {
  width: 100%;
  height: auto;
  display: block;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: var(--about-hair);
}

.page-about .about-figure .figure__caption {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 0.73rem;
  color: var(--cool-gray);
  line-height: 1.5;
}

.page-about .about-note {
  margin: 24px 0 0;
  padding: 18px 20px;
  background: var(--cement);
  border-left: 5px solid var(--flame);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-note__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--flame-deep);
}

.page-about .about-note p:last-child {
  margin: 0;
  color: var(--ink);
  font-size: 1.02rem;
  font-weight: 600;
}

/* 三步流程 */
.page-about .method-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 18px 0 6px;
}

.page-about .method-step {
  position: relative;
  padding: 18px 18px 16px;
  background: var(--paper-white);
  border: var(--about-hair);
  border-radius: var(--radius-md);
}

.page-about .method-step__num {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  border-radius: var(--radius-sm);
  background: var(--ink-green);
  color: var(--lime);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
}

.page-about .method-step p {
  margin: 0;
  font-size: 0.93rem;
}

/* 四个习惯 */
.page-about .habits {
  display: grid;
  gap: 12px;
  margin-top: 18px;
}

.page-about .habit {
  border: var(--about-hair);
  border-radius: var(--radius-lg);
  padding: 0 18px;
  background: rgba(201, 196, 184, 0.34);
}

.page-about .habit:nth-child(1) { background: rgba(255, 90, 42, 0.08); }
.page-about .habit:nth-child(2) { background: rgba(199, 255, 61, 0.16); }
.page-about .habit:nth-child(3) { background: rgba(111, 138, 124, 0.16); }
.page-about .habit:nth-child(4) { background: rgba(14, 42, 36, 0.08); }

.page-about .habit__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  min-height: 52px;
  padding: 12px 0;
  cursor: pointer;
  list-style: none;
  font-size: 1rem;
  font-weight: 700;
  color: var(--ink);
}

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

.page-about .habit__summary::after {
  content: "+";
  flex: 0 0 auto;
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border: 1px solid rgba(18, 23, 22, 0.34);
  border-radius: 50%;
  font-family: var(--font-mono);
  font-size: 0.92rem;
  line-height: 1;
}

.page-about .habit[open] .habit__summary::after {
  content: "–";
  background: var(--ink-green);
  border-color: var(--ink-green);
  color: var(--lime);
}

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

.page-about .habit__body p {
  margin: 0;
  font-size: 0.94rem;
}

/* 时间线 */
.page-about .about-track {
  margin: 18px 0 26px;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 2px dashed rgba(18, 23, 22, 0.26);
}

.page-about .about-track__item {
  position: relative;
  padding: 0 0 22px 6px;
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--flame);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .about-track__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--flame-deep);
  margin-bottom: 4px;
}

.page-about .about-track__body p {
  margin: 0;
  font-size: 0.94rem;
}

/* 合作生态 */
.page-about .eco-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .eco-card {
  padding: 18px;
  border-radius: var(--radius-md);
  background: var(--ink-green);
  color: var(--paper);
  border: 1px solid rgba(244, 238, 223, 0.16);
}

.page-about .eco-card__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--lime);
  line-height: 1.1;
}

.page-about .eco-card__label {
  display: block;
  margin-top: 4px;
  font-size: 0.85rem;
  color: rgba(244, 238, 223, 0.86);
}

.page-about .eco-card__note {
  margin: 10px 0 0;
  font-size: 0.87rem;
  line-height: 1.66;
  color: rgba(244, 238, 223, 0.72);
}

.page-about .about-linkline {
  margin-top: 18px;
  font-size: 0.92rem;
}

.page-about .about-linkline a {
  color: var(--flame-deep);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* 场景 */
.page-about .scene-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 18px 0 24px;
}

.page-about .scene-card {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 18px;
  background: var(--paper-white);
  border: var(--about-hair-strong);
  border-radius: var(--radius-md);
}

.page-about .scene-card__step {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--flame-deep);
}

.page-about .scene-card h3 {
  margin: 2px 0 6px;
  font-size: 1.04rem;
  font-weight: 800;
}

.page-about .scene-card p {
  margin: 0 0 12px;
  font-size: 0.9rem;
}

.page-about .scene-card__link {
  margin-top: auto;
  align-self: flex-start;
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  color: var(--ink-green);
  text-decoration: none;
  border-bottom: 2px solid var(--flame);
  padding: 6px 0;
}

.page-about .scene-card__link:hover,
.page-about .scene-card__link:focus-visible {
  color: var(--flame-deep);
  outline: none;
}

.page-about .about-cta {
  margin-top: 8px;
  padding: clamp(22px, 4vw, 34px);
  border-radius: var(--radius-lg);
  background: linear-gradient(135deg, rgba(255, 90, 42, 0.12), rgba(14, 42, 36, 0.06) 62%, rgba(201, 196, 184, 0.5));
  border: var(--about-hair);
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-size: clamp(1.15rem, 3vw, 1.5rem);
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-cta__text {
  margin: 0 0 16px;
  font-size: 0.94rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .about-cta .meta-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--about-soft);
  word-break: break-word;
}

@media (min-width: 720px) {
  .page-about .about-strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .method-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .method-step:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 34px;
    right: -18px;
    width: 18px;
    border-top: 2px dashed rgba(18, 23, 22, 0.28);
  }

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

  .page-about .eco-card__note {
    opacity: 0.55;
    transition: opacity var(--dur) var(--ease);
  }

  .page-about .eco-card:hover .eco-card__note,
  .page-about .eco-card:focus-within .eco-card__note {
    opacity: 1;
  }

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

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-shell {
    grid-template-columns: 208px minmax(0, 1fr);
  }

  .page-about .about-rail .rail__sticky {
    position: sticky;
    top: calc(var(--header-h) + 18px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0 0 0 12px;
    border-left: 2px solid rgba(18, 23, 22, 0.16);
    scrollbar-width: none;
  }

  .page-about .about-rail__link {
    width: 100%;
    min-height: 40px;
    padding: 8px 12px;
    border: 0;
    border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
    background: transparent;
    color: var(--about-soft);
    font-size: 0.78rem;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(201, 196, 184, 0.42);
    color: var(--ink);
  }

  .page-about .about-rail__link.is-active,
  .page-about .about-rail__link[aria-current="true"] {
    background: var(--ink-green);
    color: var(--paper);
  }

  .page-about .about-section h2 {
    margin-bottom: 16px;
  }

  .page-about .about-track {
    padding-left: 24px;
  }
}
<<<END>>>