.page-about {
  --about-plate: 208px;
  --about-rule: rgba(47, 227, 200, .22);
  --about-rule-soft: rgba(159, 184, 177, .2);
  position: relative;
  background: var(--ink);
  color: var(--fog);
  font-family: var(--font-body);
  padding-bottom: clamp(44px, 8vw, 96px);
}

/* ---------- 首屏封面 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(72px, 12vw, 130px) 0 clamp(34px, 6vw, 74px);
  background:
    radial-gradient(120% 85% at 6% -12%, rgba(47, 227, 200, .17), transparent 58%),
    radial-gradient(90% 70% at 98% 10%, rgba(242, 180, 67, .1), transparent 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: 6%;
  height: 2px;
  background: linear-gradient(90deg, rgba(47, 227, 200, .55), rgba(242, 180, 67, .4), transparent);
  transform: rotate(-2.4deg);
  pointer-events: none;
}

.page-about .about-hero-grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(22px, 4vw, 40px);
}

.page-about .about-display {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  font-size: clamp(34px, 8.4vw, 76px);
  line-height: 1.05;
  margin: 14px 0 0;
  color: var(--fog);
}

.page-about .about-display-mark {
  display: inline-block;
  color: var(--cyan);
  position: relative;
}

.page-about .about-display-mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: .06em;
  height: .1em;
  background: linear-gradient(90deg, var(--amber), transparent);
  opacity: .7;
}

.page-about .about-lede {
  margin: clamp(16px, 3vw, 24px) 0 0;
  max-width: 44ch;
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.78;
  color: rgba(232, 243, 239, .86);
}

.page-about .about-hero-meta {
  margin: 22px 0 0;
  font-size: 13px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-hero-meta .num {
  font-family: var(--font-mono);
  font-size: 15px;
}

/* 章节速览浮岛 */
.page-about .about-hero-index {
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 70, 60, .78), rgba(11, 46, 40, .62));
  box-shadow: var(--shadow-panel);
  padding: 20px 18px 14px;
}

.page-about .about-index-title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

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

.page-about .about-index-list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px;
  border-radius: var(--radius-s);
  border-bottom: 1px dashed var(--about-rule-soft);
  color: var(--fog);
  text-decoration: none;
  font-size: 14px;
  line-height: 1.5;
  transition: background .28s var(--ease), color .28s var(--ease);
}

.page-about .about-index-list li:last-child a {
  border-bottom: 0;
}

.page-about .about-index-list a .num {
  font-family: var(--font-mono);
  font-size: 12px;
}

.page-about .about-index-list a:hover,
.page-about .about-index-list a:focus-visible {
  background: rgba(47, 227, 200, .12);
  color: var(--cyan);
  outline: none;
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(38px, 7vw, 86px) 0;
}

.page-about .about-row {
  display: grid;
  gap: clamp(20px, 3.5vw, 44px);
  position: relative;
  z-index: 1;
}

.page-about .about-plate {
  align-self: start;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--cyan);
}

.page-about .about-plate-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--amber);
}

.page-about .about-plate-title {
  margin: 6px 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 3.2vw, 22px);
  letter-spacing: -.01em;
  color: var(--fog);
}

.page-about .about-plate-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-plate-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  padding: 6px 14px;
  border: 1px solid var(--about-rule);
  border-radius: var(--pill);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
  background: rgba(47, 227, 200, .06);
}

.page-about .about-plate-inline .num {
  font-family: var(--font-mono);
}

.page-about .about-body {
  max-width: 68ch;
}

.page-about .about-h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.02em;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.22;
  color: var(--fog);
}

.page-about .about-h3 {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -.015em;
  font-size: clamp(20px, 3.2vw, 27px);
  line-height: 1.3;
  color: var(--fog);
}

.page-about .about-body p {
  margin: 0 0 16px;
  font-size: clamp(15.5px, 2vw, 17px);
  line-height: 1.8;
  color: rgba(232, 243, 239, .86);
}

.page-about .about-quiet {
  margin-top: 22px;
  padding-left: 16px;
  border-left: 1px solid var(--about-rule);
  font-size: 15px;
  color: var(--muted);
}

.page-about .about-after {
  margin-top: 22px;
  padding-top: 18px;
  border-top: 1px solid var(--about-rule-soft);
  color: rgba(232, 243, 239, .78);
}

/* 品牌缘起章节的柔和渐变底纹 */
.page-about #origin::before {
  content: "";
  position: absolute;
  inset: 4% -18%;
  background:
    radial-gradient(48% 58% at 26% 42%, rgba(47, 227, 200, .1), transparent 70%),
    radial-gradient(38% 48% at 82% 68%, rgba(242, 180, 67, .07), transparent 72%);
  pointer-events: none;
  z-index: 0;
}

/* ---------- 图片框 ---------- */
.page-about .about-media {
  margin: 0;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-panel);
  background: var(--panel);
}

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

.page-about .about-media--tilt {
  transform: rotate(-1.1deg);
}

/* ---------- 三条主线 ---------- */
.page-about .about-pillars {
  display: grid;
  gap: 14px;
  margin: 6px 0 4px;
}

.page-about .about-pillar {
  position: relative;
  padding: 22px 18px 20px;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(18, 70, 60, .62), rgba(6, 28, 24, .5));
}

.page-about .about-pillar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  border-radius: var(--radius) var(--radius) 0 0;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .about-pillar:nth-child(2)::before {
  background: linear-gradient(90deg, var(--amber), transparent);
}

.page-about .about-pillar:nth-child(3)::before {
  background: linear-gradient(90deg, var(--cyan-soft), transparent);
}

.page-about .about-pillar-key {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--cyan);
}

.page-about .about-pillar:nth-child(2) .about-pillar-key {
  color: var(--amber);
}

.page-about .about-pillar-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(18px, 2.6vw, 21px);
  line-height: 1.34;
  color: var(--fog);
}

.page-about .about-pillar p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 243, 239, .8);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: var(--pill);
  background: linear-gradient(180deg, var(--cyan), var(--amber));
  opacity: .55;
}

.page-about .about-node {
  position: relative;
  padding: 0 0 30px 0;
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(47, 227, 200, .12);
}

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

.page-about .about-node:last-child::before {
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(242, 180, 67, .14);
}

.page-about .about-node-year {
  margin: 0 0 4px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: .06em;
  color: var(--amber);
}

.page-about .about-node-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(17px, 2.6vw, 20px);
  line-height: 1.35;
  color: var(--fog);
}

.page-about .about-node p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: rgba(232, 243, 239, .8);
}

/* ---------- 团队数据条 ---------- */
.page-about .about-bars {
  display: grid;
  gap: 14px;
  margin: 22px 0 4px;
  padding: 20px 18px;
  border: 1px solid var(--about-rule);
  border-radius: var(--radius);
  background: rgba(18, 70, 60, .38);
}

.page-about .about-bar {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) 60px;
  align-items: center;
  gap: 12px;
  font-size: 14px;
}

.page-about .about-bar-label {
  color: var(--muted);
}

.page-about .about-bar-track {
  display: block;
  height: 8px;
  border-radius: var(--pill);
  background: rgba(159, 184, 177, .16);
  overflow: hidden;
}

.page-about .about-bar-fill {
  display: block;
  height: 100%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--cyan), var(--cyan-soft));
}

.page-about .about-bar:nth-child(1) .about-bar-fill { width: 42%; }
.page-about .about-bar:nth-child(2) .about-bar-fill { width: 13%; }
.page-about .about-bar:nth-child(3) .about-bar-fill { width: 27%; }
.page-about .about-bar:nth-child(4) .about-bar-fill { width: 18%; }

.page-about .about-bar:nth-child(4) .about-bar-fill {
  background: linear-gradient(90deg, var(--amber), var(--amber-soft));
}

.page-about .about-bar-num {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--amber);
  text-align: right;
}

/* ---------- 数据标准步骤 ---------- */
.page-about .about-steps {
  counter-reset: about-step;
  list-style: none;
  margin: 6px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-steps li {
  position: relative;
  padding: 16px 18px 14px 56px;
  border-left: 2px solid var(--about-rule);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: linear-gradient(90deg, rgba(18, 70, 60, .5), rgba(6, 28, 24, .28));
}

.page-about .about-steps li::before {
  counter-increment: about-step;
  content: "0" counter(about-step);
  position: absolute;
  left: 18px;
  top: 17px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--amber);
}

.page-about .about-step-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  color: var(--fog);
}

.page-about .about-steps li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(232, 243, 239, .8);
}

/* ---------- 合作生态标签 ---------- */
.page-about .about-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
  padding: 0;
}

.page-about .about-tag {
  position: relative;
  display: inline-flex;
  align-items: center;
  padding: 9px 16px;
  border: 1px solid var(--about-rule);
  border-radius: var(--pill);
  background: rgba(18, 70, 60, .42);
  font-size: 13px;
  color: var(--fog);
  cursor: default;
  transition: border-color .28s var(--ease), color .28s var(--ease), background .28s var(--ease);
}

.page-about .about-tag:hover,
.page-about .about-tag:focus-visible {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(47, 227, 200, .1);
  outline: none;
}

.page-about .about-tag-tip {
  position: absolute;
  left: 0;
  top: calc(100% + 8px);
  z-index: 4;
  width: max-content;
  max-width: 230px;
  padding: 8px 12px;
  font-size: 12px;
  font-style: normal;
  line-height: 1.6;
  color: var(--paper-ink);
  background: var(--paper);
  border-radius: var(--radius-s);
  box-shadow: var(--shadow-paper);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-4px);
  transition: opacity .24s var(--ease), transform .24s var(--ease), visibility .24s;
}

.page-about .about-tag:hover .about-tag-tip,
.page-about .about-tag:focus-visible .about-tag-tip {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  margin-top: clamp(34px, 6vw, 76px);
  padding: clamp(26px, 5vw, 52px);
  border: 1px solid var(--about-rule);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(90% 120% at 100% 0%, rgba(242, 180, 67, .12), transparent 58%),
    linear-gradient(135deg, rgba(18, 70, 60, .85), rgba(6, 28, 24, .92));
  box-shadow: var(--shadow-panel);
  display: grid;
  gap: clamp(20px, 3.5vw, 36px);
}

.page-about .about-cta-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  font-size: clamp(24px, 4.2vw, 36px);
  line-height: 1.2;
  color: var(--fog);
}

.page-about .about-cta-copy p {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(15px, 2vw, 17px);
  line-height: 1.8;
  color: rgba(232, 243, 239, .84);
}

.page-about .about-cta-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 桌面栅格 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, .82fr);
    align-items: start;
  }

  .page-about .about-hero-index {
    margin-top: 26px;
  }

  .page-about .about-row {
    grid-template-columns: var(--about-plate) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-plate {
    position: sticky;
    top: 108px;
  }

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

  .page-about .about-row--flip .about-plate {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-row--flip .about-body {
    grid-column: 1;
    grid-row: 1;
  }

  .page-about .about-pillars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-row--media {
    grid-template-columns: minmax(0, 1.02fr) minmax(0, 1fr);
  }

  .page-about .about-media--side {
    grid-column: 2;
    grid-row: 1 / span 2;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (min-width: 1160px) {
  .page-about .about-body p,
  .page-about .about-node p,
  .page-about .about-steps li p {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-media--tilt {
    transform: none;
  }

  .page-about .about-tag-tip {
    transition: none;
  }
}