.page-about {
  --about-cut: 24px;
  --about-cut-sm: 16px;
  background: var(--ink-900);
  color: var(--paper);
}

.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 52px) 0 clamp(36px, 5.5vw, 76px);
  background:
    radial-gradient(120% 90% at 88% -12%, rgba(53, 242, 208, 0.13), transparent 55%),
    radial-gradient(90% 80% at -5% 112%, rgba(61, 139, 255, 0.14), transparent 60%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--line), transparent);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  align-items: start;
}

.page-about .about-hero__story h1 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.85rem, 4.6vw, 3.2rem);
  line-height: 1.1;
  letter-spacing: -0.01em;
  margin: 0.45rem 0 1rem;
  max-width: 19ch;
}

.page-about .about-hero__story .lede {
  color: var(--paper);
  opacity: 0.9;
  font-size: clamp(0.98rem, 1.4vw, 1.08rem);
  line-height: 1.8;
  max-width: 58ch;
}

.page-about .about-hero__story p + p {
  margin-top: 0.9rem;
  color: var(--paper-dim);
  font-size: 0.95rem;
  line-height: 1.8;
  max-width: 58ch;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

/* 右侧刻度板 */
.page-about .about-board {
  position: relative;
  padding: clamp(18px, 2.6vw, 28px);
  background:
    linear-gradient(160deg, rgba(53, 242, 208, 0.08), transparent 45%),
    linear-gradient(200deg, var(--ink-800), var(--ink-750) 55%, var(--ink-900));
  clip-path: polygon(0 0, calc(100% - 26px) 0, 100% 26px, 100% 100%, 26px 100%, 0 calc(100% - 26px));
  box-shadow: inset 0 0 0 1px var(--line);
}

.page-about .about-board::before {
  content: "";
  display: block;
  width: 46px;
  height: 3px;
  margin-bottom: 14px;
  background: var(--orange);
}

.page-about .about-board__title {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--steel);
  text-transform: uppercase;
  margin-bottom: 14px;
}

.page-about .gauge {
  display: grid;
  gap: 12px;
}

.page-about .gauge__row {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 0.45rem;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .gauge__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.2vw, 1.85rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .gauge__plus {
  font-size: 0.62em;
  margin-left: 1px;
}

.page-about .gauge__unit {
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--paper-dim);
}

.page-about .gauge__label {
  margin-left: auto;
  font-size: 0.76rem;
  color: var(--steel);
  text-align: right;
}

.page-about .about-board__foot {
  margin-top: 16px;
  font-size: 0.8rem;
  line-height: 1.65;
  color: var(--paper-dim);
  padding-left: 0.8rem;
  border-left: 2px solid var(--cyan);
}

/* 主体：左侧叙事轨道 + 右侧纵向内容 */
.page-about .about-body {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  padding-top: clamp(34px, 5vw, 68px);
  padding-bottom: clamp(34px, 5vw, 68px);
}

.page-about .rail-list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .rail-list a {
  display: flex;
  gap: 0.7rem;
  align-items: baseline;
  padding: 0.6rem 0.7rem;
  color: var(--paper-dim);
  text-decoration: none;
  border-left: 2px solid var(--line-soft);
  font-size: 0.9rem;
  transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
}

.page-about .rail-list a:hover,
.page-about .rail-list a:focus-visible {
  color: var(--paper);
  border-left-color: var(--orange);
  background: rgba(255, 138, 61, 0.08);
}

.page-about .rail-list span {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  color: var(--cyan);
}

.page-about .about-rail__note {
  margin-top: 20px;
  padding-left: 0.9rem;
  border-left: 2px solid var(--orange);
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--steel);
}

.page-about .about-chapter {
  padding-bottom: clamp(30px, 4.5vw, 56px);
  margin-bottom: clamp(30px, 4.5vw, 56px);
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-chapter:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-about .about-chapter h2 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.4rem, 2.9vw, 2rem);
  line-height: 1.18;
  margin: 0.35rem 0 0.9rem;
}

.page-about .about-chapter p {
  max-width: 62ch;
  color: var(--paper-dim);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .about-chapter p + p {
  margin-top: 0.85rem;
}

/* 图片容器 */
.page-about .origin-media,
.page-about .team-media {
  position: relative;
  margin: clamp(20px, 3vw, 30px) 0 0;
  overflow: hidden;
  clip-path: polygon(0 0, calc(100% - var(--about-cut-sm)) 0, 100% var(--about-cut-sm), 100% 100%, 0 100%);
  background: var(--ink-750);
}

.page-about .origin-media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 55%;
  background: linear-gradient(180deg, transparent, rgba(5, 15, 28, 0.92));
  pointer-events: none;
}

.page-about .origin-media img,
.page-about .team-media img,
.page-about .tl-visual img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.72) brightness(0.8) contrast(1.05);
}

.page-about .origin-media figcaption {
  position: absolute;
  left: clamp(14px, 2.4vw, 24px);
  bottom: clamp(12px, 2vw, 20px);
  z-index: 1;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .team-media figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--steel);
  padding: 10px 0 0;
}

/* 三步流程 */
.page-about .flow {
  list-style: none;
  display: grid;
  gap: 12px;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  counter-reset: flow;
}

.page-about .flow__step {
  padding: 18px 16px 20px;
  background: linear-gradient(165deg, var(--ink-800), var(--ink-750));
  clip-path: polygon(0 0, calc(100% - var(--about-cut-sm)) 0, 100% var(--about-cut-sm), 100% 100%, 0 100%);
  box-shadow: inset 0 0 0 1px var(--line-soft);
  transition: box-shadow 0.2s ease, background 0.2s ease;
}

.page-about .flow__step:hover {
  box-shadow: inset 0 0 0 1px var(--cyan);
  background: linear-gradient(165deg, var(--ink-700), var(--ink-800));
}

.page-about .flow__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  color: var(--orange);
  margin-bottom: 0.5rem;
}

.page-about .flow__step h3 {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  color: var(--paper);
  margin: 0 0 0.45rem;
}

.page-about .flow__step p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--paper-dim);
}

/* 服务对象卡片 */
.page-about .aud-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .aud-card {
  padding: 18px 16px 20px;
  background: rgba(16, 42, 68, 0.55);
  border-top: 2px solid var(--f-blue);
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-about .aud-card:hover {
  background: rgba(22, 52, 79, 0.75);
  transform: translateY(-2px);
}

.page-about .aud-card--blue {
  border-top-color: var(--f-blue);
}

.page-about .aud-card--cyan {
  border-top-color: var(--cyan);
}

.page-about .aud-card--orange {
  border-top-color: var(--orange);
}

.page-about .aud-card--green {
  border-top-color: var(--f-green);
}

.page-about .aud-card h3 {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1rem;
  color: var(--paper);
  margin: 0 0 0.5rem;
}

.page-about .aud-card p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--paper-dim);
}

/* 能力数字带 */
.page-about .about-capability {
  padding: clamp(34px, 5vw, 68px) 0;
  background: linear-gradient(180deg, var(--ink-950), var(--ink-800) 58%, var(--ink-900));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .cap-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.35rem, 2.8vw, 1.95rem);
  line-height: 1.2;
  margin: 0.35rem 0 0;
  max-width: 24ch;
}

.page-about .cap-grid {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  margin-top: clamp(20px, 3vw, 32px);
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
}

.page-about .cap-cell {
  position: relative;
  padding: 18px 14px 22px;
  background: var(--ink-900);
}

.page-about .cap-cell::after {
  content: "";
  display: block;
  width: 26px;
  height: 2px;
  margin-top: 12px;
  background: var(--orange);
}

.page-about .cap-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.4rem, 2.8vw, 1.9rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .cap-plus {
  font-size: 0.6em;
  margin-left: 1px;
}

.page-about .cap-unit {
  margin-top: 0.4rem;
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--paper-dim);
}

.page-about .cap-label {
  margin-top: 0.4rem;
  font-size: 0.78rem;
  line-height: 1.5;
  color: var(--steel);
}

/* 时间轴 */
.page-about .about-timeline {
  padding: clamp(36px, 5.5vw, 80px) 0;
}

.page-about .tl-layout {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
  align-items: start;
}

.page-about .tl-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.4rem, 3vw, 2.05rem);
  line-height: 1.18;
  margin: 0.35rem 0 clamp(20px, 3vw, 30px);
  max-width: 20ch;
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, var(--f-blue), var(--cyan), var(--orange), var(--f-yellow));
  opacity: 0.6;
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 clamp(22px, 3vw, 34px) 34px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 15px;
  height: 15px;
  background: var(--ink-900);
  border: 2px solid var(--f-blue);
  transform: rotate(45deg);
}

.page-about .tl-item:nth-child(2)::before {
  border-color: var(--cyan);
}

.page-about .tl-item:nth-child(3)::before {
  border-color: var(--orange);
}

.page-about .tl-item:nth-child(4)::before {
  border-color: var(--f-yellow);
}

.page-about .tl-stage {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--steel);
  margin: 0;
}

.page-about .tl-item h3 {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.02rem;
  color: var(--paper);
  margin: 0.35rem 0 0.45rem;
}

.page-about .tl-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--paper-dim);
  max-width: 54ch;
}

.page-about .tl-visual {
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  background: var(--ink-750);
}

.page-about .tl-visual figcaption {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--steel);
  padding: 10px 0 0;
}

/* 合作生态 */
.page-about .about-eco {
  padding: clamp(36px, 5vw, 72px) 0;
  background: linear-gradient(180deg, var(--ink-900), var(--ink-950));
  border-top: 1px solid var(--line-soft);
}

.page-about .eco-layout {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
  align-items: center;
}

.page-about .eco-ring {
  position: relative;
  width: 100%;
  max-width: 340px;
  margin: 30px auto;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  border: 1px dashed rgba(125, 147, 168, 0.4);
  display: grid;
  place-items: center;
  background: radial-gradient(circle at 50% 50%, rgba(53, 242, 208, 0.09), transparent 62%);
}

.page-about .eco-core {
  text-align: center;
}

.page-about .eco-core strong {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 4vw, 2.4rem);
  color: var(--cyan);
  line-height: 1;
}

.page-about .eco-core span {
  display: block;
  margin-top: 0.4rem;
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--paper-dim);
}

.page-about .eco-node {
  position: absolute;
  transform: translate(-50%, -50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  width: 88px;
  text-align: center;
}

.page-about .eco-node__dot {
  width: 14px;
  height: 14px;
  transform: rotate(45deg);
  background: var(--ink-900);
  border: 2px solid var(--cyan);
  transition: background 0.2s ease, transform 0.2s ease;
}

.page-about .eco-node:hover .eco-node__dot {
  background: var(--cyan);
  transform: rotate(45deg) scale(1.18);
}

.page-about .eco-node__label {
  font-size: 0.72rem;
  line-height: 1.35;
  color: var(--paper-dim);
}

.page-about .eco-node--a {
  left: 50%;
  top: 4%;
}

.page-about .eco-node--b {
  left: 96%;
  top: 50%;
}

.page-about .eco-node--c {
  left: 50%;
  top: 96%;
}

.page-about .eco-node--d {
  left: 4%;
  top: 50%;
}

.page-about .eco-node--b .eco-node__dot {
  border-color: var(--f-blue);
}

.page-about .eco-node--c .eco-node__dot {
  border-color: var(--orange);
}

.page-about .eco-node--d .eco-node__dot {
  border-color: var(--f-yellow);
}

.page-about .eco-title {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.4rem, 2.9vw, 2rem);
  line-height: 1.2;
  margin: 0.35rem 0 0.9rem;
  max-width: 20ch;
}

.page-about .eco-copy > p {
  max-width: 60ch;
  color: var(--paper-dim);
  font-size: 0.95rem;
  line-height: 1.85;
}

.page-about .eco-copy > p + p {
  margin-top: 0.85rem;
}

.page-about .eco-grid {
  display: grid;
  gap: 14px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .eco-item {
  padding-left: 14px;
  border-left: 2px solid var(--line);
  transition: border-color 0.2s ease;
}

.page-about .eco-item:hover {
  border-left-color: var(--cyan);
}

.page-about .eco-item h3 {
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--paper);
  margin: 0 0 0.3rem;
}

.page-about .eco-item p {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.7;
  color: var(--steel);
}

/* 联系 CTA */
.page-about .about-cta {
  padding: clamp(34px, 5vw, 66px) 0 clamp(46px, 6vw, 84px);
}

.page-about .cta-panel {
  position: relative;
  padding: clamp(22px, 4vw, 46px);
  background:
    linear-gradient(120deg, rgba(255, 138, 61, 0.15), transparent 55%),
    linear-gradient(205deg, rgba(53, 242, 208, 0.11), transparent 60%),
    var(--ink-800);
  clip-path: polygon(0 0, calc(100% - 30px) 0, 100% 30px, 100% 100%, 30px 100%, 0 calc(100% - 30px));
  box-shadow: inset 0 0 0 1px var(--line);
}

.page-about .cta-panel h2 {
  font-family: var(--font-display);
  font-style: italic;
  font-weight: 900;
  font-size: clamp(1.35rem, 2.9vw, 1.95rem);
  line-height: 1.2;
  margin: 0.35rem 0 0.8rem;
}

.page-about .cta-panel > p {
  max-width: 58ch;
  color: var(--paper-dim);
  font-size: 0.94rem;
  line-height: 1.8;
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .cta-contact {
  display: grid;
  gap: 8px;
  margin-top: clamp(20px, 3vw, 28px);
  padding-top: clamp(16px, 2.4vw, 22px);
  border-top: 1px solid var(--line-soft);
}

.page-about .cta-contact p {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: baseline;
  margin: 0;
  font-size: 0.86rem;
  color: var(--paper-dim);
}

.page-about .cta-key {
  min-width: 5.5em;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--steel);
}

.page-about .cta-contact a {
  color: var(--cyan);
  text-decoration: none;
  word-break: break-all;
}

.page-about .cta-contact a:hover,
.page-about .cta-contact a:focus-visible {
  text-decoration: underline;
}

/* 断点 */
@media (min-width: 640px) {
  .page-about .aud-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 780px) {
  .page-about .flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .tl-layout {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
  }

  .page-about .eco-layout {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
  }
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: minmax(190px, 230px) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1100px) {
  .page-about .eco-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 22px;
  }
}
</main>