/* ============================================================
   page-about — 品牌价值主张
   ============================================================ */

.page-about {
  --about-gap: clamp(64px, 9vw, 132px);
  --about-ink: var(--c-cream);
  --about-dim: var(--c-mute);
  --about-hair: var(--c-line);
  --about-mark: 92px;
  color: var(--about-ink);
  font-family: var(--font-cn);
  background: var(--c-deep);
}

.page-about .about-top {
  padding-top: 26px;
}

/* ---------- 封面首屏 ---------- */

.page-about .about-hero {
  padding: clamp(28px, 5vw, 60px) 0 var(--about-gap);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
  align-items: start;
}

.page-about .about-shot {
  margin: 0;
  position: relative;
  border-radius: var(--radius-lg);
  border: 1px solid var(--about-hair);
  background: var(--c-navy);
  overflow: hidden;
}

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

.page-about .about-shot--hero .about-shot__img {
  aspect-ratio: 4 / 3;
}

.page-about .about-shot--wide .about-shot__img {
  aspect-ratio: 14 / 9;
}

.page-about .about-shot--mid .about-shot__img {
  aspect-ratio: 3 / 2;
}

.page-about .about-shot__cap {
  position: absolute;
  left: 18px;
  right: 18px;
  bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.5;
  letter-spacing: 0.05em;
  color: var(--c-mute);
  text-shadow: 0 1px 12px rgba(7, 16, 25, 0.9);
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--c-cyan);
}

.page-about .about-hero__title {
  margin: 20px 0 0;
  font-size: clamp(34px, 6vw, 74px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--about-ink);
}

.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 44ch;
  font-size: clamp(16px, 1.4vw, 18px);
  line-height: 1.8;
  color: var(--c-cream);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  margin: 38px 0 0;
  padding: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-fact {
  background: var(--c-navy);
  padding: 15px 16px;
}

.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--about-dim);
}

.page-about .about-fact__val {
  margin: 9px 0 0;
  font-family: var(--font-mono);
  font-size: 19px;
  letter-spacing: 0.05em;
  color: var(--c-cyan);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  padding-bottom: var(--about-gap);
}

.page-about .about-chapter__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .about-chapter__mark {
  display: flex;
  align-items: flex-start;
  gap: 16px;
}

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
  padding-top: 2px;
}

.page-about .about-chapter__annot {
  position: relative;
  display: inline-block;
  outline: none;
}

.page-about .about-chapter__annot-tag {
  display: inline-block;
  writing-mode: horizontal-tb;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--about-dim);
  transition: color var(--dur) var(--ease);
}

.page-about .about-chapter__annot:hover .about-chapter__annot-tag,
.page-about .about-chapter__annot:focus-visible .about-chapter__annot-tag {
  color: var(--c-cyan-soft);
}

.page-about .about-chapter__annot-note {
  display: none;
}

.page-about .about-chapter__body {
  max-width: 66ch;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 40px);
  font-weight: 800;
  line-height: 1.16;
  letter-spacing: -0.02em;
  color: var(--about-ink);
}

.page-about .about-chapter__text {
  margin: 20px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-dim);
}

.page-about .about-chapter__text:first-of-type {
  color: var(--c-cream);
}

/* ---------- 三类人群 ---------- */

.page-about .about-personas {
  margin-top: 30px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-persona {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 24px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-persona__idx {
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.1em;
  color: var(--c-cyan);
  padding-top: 3px;
}

.page-about .about-persona__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--about-ink);
}

.page-about .about-persona__want {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-cream);
}

.page-about .about-persona__give {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-dim);
}

/* ---------- 三处分工 ---------- */

.page-about .about-shot--wide {
  margin-top: 30px;
}

.page-about .about-pillars {
  margin-top: 26px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-pillar {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 14px;
  padding: 26px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-pillar__idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
  padding-top: 4px;
}

.page-about .about-pillar__title {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--about-ink);
}

.page-about .about-pillar__text {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-dim);
}

.page-about .about-pillar__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-pillar__list li {
  position: relative;
  padding-left: 18px;
  margin-top: 8px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-cream);
}

.page-about .about-pillar__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--c-cyan);
  opacity: 0.75;
}

.page-about .about-pillar__link {
  display: inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--c-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 224, 214, 0.35);
  padding-bottom: 3px;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-pillar__link:hover,
.page-about .about-pillar__link:focus-visible {
  color: var(--c-cyan-soft);
  border-color: var(--c-cyan-soft);
}

/* ---------- 团队与规模 ---------- */

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 18px;
  margin-top: 30px;
  padding: 26px 0;
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, 42px);
  letter-spacing: -0.01em;
  color: var(--c-cream);
}

.page-about .about-stat__num em {
  font-style: normal;
  font-size: 0.5em;
  margin-left: 3px;
  color: var(--c-cyan);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.5;
  letter-spacing: 0.03em;
  color: var(--about-dim);
}

.page-about .about-shot--mid {
  margin-top: 30px;
}

/* ---------- 里程碑 ---------- */

.page-about .about-tl {
  display: block;
  width: 100%;
  height: auto;
  margin: 32px 0 4px;
  overflow: visible;
}

.page-about .about-tl__line {
  stroke: var(--c-line);
  stroke-width: 1.5;
}

.page-about .about-tl__dot {
  fill: var(--c-cyan);
}

.page-about .about-tl__dot--now {
  fill: var(--c-cyan);
}

.page-about .about-ms-list {
  border-top: 1px solid var(--about-hair);
}

.page-about .about-ms {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-ms__head {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr) 18px;
  gap: 14px;
  align-items: center;
  padding: 18px 0;
  cursor: pointer;
  list-style: none;
  font-size: 16px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--about-ink);
  transition: color var(--dur) var(--ease);
}

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

.page-about .about-ms__head:hover {
  color: var(--c-cyan-soft);
}

.page-about .about-ms__node {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-cyan);
  opacity: 0.85;
}

.page-about .about-ms__node--now {
  box-shadow: 0 0 0 4px rgba(53, 224, 214, 0.16);
}

.page-about .about-ms__name {
  min-width: 0;
}

.page-about .about-ms__sign {
  position: relative;
  width: 12px;
  height: 12px;
  justify-self: end;
}

.page-about .about-ms__sign::before,
.page-about .about-ms__sign::after {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 12px;
  height: 1.5px;
  background: var(--c-mute);
  transition: transform var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-ms__sign::after {
  transform: rotate(90deg);
}

.page-about .about-ms[open] .about-ms__sign::after {
  transform: rotate(0deg);
}

.page-about .about-ms[open] .about-ms__sign::before,
.page-about .about-ms[open] .about-ms__sign::after {
  background: var(--c-cyan);
}

.page-about .about-ms__body {
  margin: 0;
  padding: 0 26px 20px 32px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--about-dim);
}

.page-about .about-ms--now .about-ms__name {
  color: var(--c-cyan);
}

/* ---------- 资质 ---------- */

.page-about .about-credits {
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-credit {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-credit__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--c-cyan);
}

.page-about .about-credit__val {
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-cream);
}

/* ---------- 生态与下一步 ---------- */

.page-about .about-honors {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 26px;
}

.page-about .about-honor {
  display: inline-block;
  padding: 8px 16px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-pill);
  background: var(--c-navy);
  font-size: 13px;
  letter-spacing: 0.03em;
  color: var(--c-cyan-soft);
}

.page-about .about-next {
  margin-top: 40px;
  padding: 26px 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--radius-lg);
  background: var(--c-teal);
}

.page-about .about-next__lead {
  margin: 0;
  font-size: 14px;
  letter-spacing: 0.03em;
  color: var(--c-cream);
}

.page-about .about-next__list {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 平板及以上 ---------- */

@media (min-width: 768px) {
  .page-about .about-credit {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

  .page-about .about-persona {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .about-pillar {
    grid-template-columns: 46px minmax(0, 1fr);
    gap: 20px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
    gap: 40px;
    align-items: end;
  }

  .page-about .about-shot--hero {
    grid-column: 1 / 6;
  }

  .page-about .about-shot--hero .about-shot__img {
    aspect-ratio: 3 / 4;
  }

  .page-about .about-hero__body {
    grid-column: 7 / 13;
  }

  .page-about .about-chapter__grid {
    grid-template-columns: var(--about-mark) minmax(0, 1fr);
    gap: 44px;
  }

  .page-about .about-chapter__mark {
    flex-direction: column;
    gap: 18px;
    align-items: flex-start;
    position: sticky;
    top: 40px;
    align-self: start;
  }

  .page-about .about-chapter__annot-tag {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    padding: 4px 0 4px 8px;
    border-left: 1px solid var(--about-hair);
  }

  .page-about .about-chapter__annot-note {
    display: block;
    position: absolute;
    top: 0;
    left: calc(100% + 10px);
    width: max-content;
    max-width: 22ch;
    padding: 6px 14px;
    border: 1px solid var(--c-line);
    border-radius: var(--radius-pill);
    background: var(--c-navy);
    font-family: var(--font-mono);
    font-size: 12px;
    line-height: 1.5;
    letter-spacing: 0.06em;
    color: var(--c-cyan-soft);
    opacity: 0;
    transform: translateX(-8px);
    pointer-events: none;
    z-index: 5;
    transition: opacity 320ms var(--ease), transform 320ms var(--ease);
  }

  .page-about .about-chapter__annot:hover .about-chapter__annot-note,
  .page-about .about-chapter__annot:focus-visible .about-chapter__annot-note {
    opacity: 1;
    transform: translateX(0);
  }

  .page-about .about-chapter--flip .about-chapter__grid {
    grid-template-columns: minmax(0, 1fr) var(--about-mark);
  }

  .page-about .about-chapter--flip .about-chapter__body {
    order: 1;
    justify-self: start;
  }

  .page-about .about-chapter--flip .about-chapter__mark {
    order: 2;
    align-items: flex-end;
  }

  .page-about .about-chapter--flip .about-chapter__annot-tag {
    border-left: 0;
    border-right: 1px solid var(--about-hair);
    padding: 4px 8px 4px 0;
  }

  .page-about .about-chapter--flip .about-chapter__annot-note {
    left: auto;
    right: calc(100% + 10px);
    transform: translateX(8px);
  }

  .page-about .about-chapter--flip .about-chapter__annot:hover .about-chapter__annot-note,
  .page-about .about-chapter--flip .about-chapter__annot:focus-visible .about-chapter__annot-note {
    transform: translateX(0);
  }

  .page-about .about-pillars {
    margin-top: 30px;
  }

  .page-about .about-ms__head {
    padding: 20px 0;
    font-size: 17px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 22px 24px;
  }

  .page-about .about-next {
    padding: 30px 30px;
  }
}

/* ---------- 降低动效偏好 ---------- */

@media (prefers-reduced-motion: reduce) {
  .page-about .about-chapter__annot-note,
  .page-about .about-chapter__annot-tag,
  .page-about .about-pillar__link,
  .page-about .about-ms__sign::before,
  .page-about .about-ms__sign::after {
    transition: none;
  }

  .page-about .about-chapter__annot-note {
    transform: none;
  }

  .page-about .about-chapter--flip .about-chapter__annot-note {
    transform: none;
  }
}
<<<END>>>