.page-about {
  --ab-hair: rgba(185, 203, 222, 0.16);
  --ab-hair-strong: rgba(185, 203, 222, 0.32);
  --ab-cyan-soft: rgba(47, 243, 214, 0.16);
  --ab-panel: rgba(16, 42, 76, 0.5);
  background: var(--deep-navy);
  color: var(--paper);
  overflow-x: clip;
}

.page-about a {
  color: inherit;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  position: relative;
  padding: clamp(88px, 13vw, 150px) 0 clamp(40px, 6vw, 68px);
  background:
    radial-gradient(115% 85% at 6% -12%, rgba(90, 31, 53, 0.7) 0%, rgba(90, 31, 53, 0) 58%),
    radial-gradient(95% 80% at 100% -5%, rgba(35, 35, 94, 0.85) 0%, rgba(35, 35, 94, 0) 62%),
    var(--deep-navy);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(30, 58, 92, 0.55) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 92, 0.55) 1px, transparent 1px);
  background-size: 84px 84px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0) 88%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0) 88%);
  pointer-events: none;
}

.page-about .ab-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .ab-hero-grid {
  display: grid;
  gap: clamp(30px, 5vw, 56px);
  margin-top: clamp(26px, 4vw, 44px);
}

.page-about .ab-hero h1 {
  margin: 16px 0 0;
  font-size: clamp(28px, 4.4vw, 50px);
  line-height: 1.24;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
  max-width: 16em;
}

.page-about .ab-lede {
  margin: 22px 0 0;
  max-width: 44em;
  font-size: 18px;
  line-height: 1.95;
  color: var(--mist-text);
}

.page-about .ab-facts {
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-l);
  background: linear-gradient(160deg, rgba(16, 42, 76, 0.92), rgba(8, 24, 46, 0.72));
  padding: clamp(20px, 3vw, 28px);
  box-shadow: 0 24px 60px -40px rgba(0, 0, 0, 0.9);
}

.page-about .ab-facts-title {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan-glow);
}

.page-about .ab-fact-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 16px;
}

.page-about .ab-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-fact-num {
  font-family: var(--font-mono);
  font-size: clamp(24px, 3.4vw, 32px);
  font-weight: 700;
  line-height: 1.05;
  color: var(--paper);
}

.page-about .ab-fact-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--mist-text);
}

.page-about .ab-index {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 20px;
  margin-top: clamp(34px, 5vw, 56px);
  padding-top: 20px;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-index a {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--mist-text);
  text-decoration: none;
  padding: 6px 0;
  border-bottom: 1px solid transparent;
  transition: color 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .ab-index a:hover,
.page-about .ab-index a:focus-visible {
  color: var(--cyan-glow);
  border-bottom-color: var(--cyan-glow);
  outline: none;
}

/* ---------- 章节公共头部 ---------- */

.page-about .ab-head {
  max-width: 48em;
  margin-bottom: clamp(30px, 5vw, 52px);
}

.page-about .ab-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--cyan-glow);
  margin-bottom: 12px;
}

.page-about .ab-num--light {
  color: var(--pulse-amber);
}

.page-about .section-title {
  margin: 0;
  font-size: clamp(24px, 3.2vw, 34px);
  line-height: 1.36;
  font-weight: 900;
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .section-lede {
  margin: 18px 0 0;
  font-size: 18px;
  line-height: 1.9;
  color: var(--mist-text);
}

.page-about .ab-model .tag,
.page-about .ab-model .tag--cyan,
.page-about .ab-model .tag--amber,
.page-about .ab-model .tag--orange {
  display: inline-block;
}

/* ---------- 图片 ---------- */

.page-about .ab-figure {
  margin: 0;
}

.page-about .ab-shot {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-l);
  border: 1px solid var(--ab-hair);
  background: var(--navy-layer);
}

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

.page-about .ab-figure--wide .ab-shot {
  aspect-ratio: 2 / 1;
}

.page-about .ab-figure--tall .ab-shot {
  aspect-ratio: 5 / 6;
}

.page-about .ab-figure--band .ab-shot {
  aspect-ratio: 5 / 2;
}

.page-about .ab-cap {
  margin-top: 14px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--mist-text);
}

/* ---------- 01 起点 · 时间轴 ---------- */

.page-about .ab-origin {
  padding: clamp(60px, 9vw, 110px) 0;
  background: linear-gradient(168deg, var(--oxblood) 0%, #2C1226 44%, var(--deep-navy) 100%);
}

.page-about .ab-origin .ab-figure {
  margin-bottom: clamp(40px, 6vw, 68px);
}

.page-about .ab-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .ab-tl-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 0 12px;
}

.page-about .ab-tl-year {
  padding-top: 3px;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan-glow);
}

.page-about .ab-tl-body {
  position: relative;
  padding: 0 0 36px 22px;
  border-left: 1px solid var(--ab-hair-strong);
}

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

.page-about .ab-tl-body::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--cyan-glow);
  box-shadow: 0 0 0 4px rgba(47, 243, 214, 0.14);
  transition: background 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .ab-tl-item:hover .ab-tl-body::before,
.page-about .ab-tl-item:focus-within .ab-tl-body::before {
  background: var(--electric-orange);
  box-shadow: 0 0 0 6px rgba(255, 122, 47, 0.16);
}

.page-about .ab-tl-title {
  margin: 0;
  font-size: 19px;
  line-height: 1.5;
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-tl-text {
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-text);
}

.page-about .ab-tl-more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 0.42s var(--ease), opacity 0.3s var(--ease), margin-top 0.42s var(--ease);
}

.page-about .ab-tl-more p {
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--paper);
  opacity: 0.86;
}

.page-about .ab-tl-item:hover .ab-tl-more,
.page-about .ab-tl-item:focus-within .ab-tl-more {
  max-height: 260px;
  opacity: 1;
  margin-top: 12px;
}

/* ---------- 02 生产流程 ---------- */

.page-about .ab-process {
  padding: clamp(60px, 9vw, 110px) 0;
  background:
    radial-gradient(80% 60% at 100% 0%, rgba(14, 59, 63, 0.65) 0%, rgba(14, 59, 63, 0) 66%),
    var(--deep-navy);
}

.page-about .ab-process-grid {
  display: grid;
  gap: clamp(34px, 5vw, 56px);
}

.page-about .ab-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: ab-step;
}

.page-about .ab-step {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 0 14px;
  padding: 22px 0;
  border-top: 1px solid var(--ab-hair);
}

.page-about .ab-step:first-child {
  border-top-color: var(--ab-hair-strong);
}

.page-about .ab-step-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--pulse-amber);
  padding-top: 5px;
}

.page-about .ab-step-title {
  margin: 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-step-text {
  margin: 10px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-text);
}

/* ---------- 03 团队分工 ---------- */

.page-about .ab-team {
  padding: clamp(60px, 9vw, 110px) 0;
  background: linear-gradient(200deg, var(--deep-teal) 0%, #0A2A34 60%, var(--deep-navy) 100%);
}

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

.page-about .ab-role {
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-m);
  background: rgba(8, 24, 46, 0.48);
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .ab-role[open] {
  border-color: rgba(47, 243, 214, 0.42);
  background: rgba(8, 24, 46, 0.78);
}

.page-about .ab-role summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 28px minmax(0, 1fr) auto 18px;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
}

.page-about .ab-role summary::-webkit-details-marker {
  display: none;
}

.page-about .ab-role summary::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  text-align: center;
  color: var(--cyan-glow);
  transition: transform 0.3s var(--ease);
}

.page-about .ab-role[open] summary::after {
  transform: rotate(45deg);
}

.page-about .ab-role summary:focus-visible {
  outline: 2px solid var(--cyan-glow);
  outline-offset: -3px;
  border-radius: var(--radius-m);
}

.page-about .ab-role-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--electric-orange);
}

.page-about .ab-role-name {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-role-count {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--mist-text);
  white-space: nowrap;
}

.page-about .ab-role-body {
  padding: 0 20px 22px;
}

.page-about .ab-role-body p {
  margin: 0;
  padding-top: 16px;
  border-top: 1px solid var(--ab-hair);
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-text);
}

/* ---------- 04 覆盖范围 ---------- */

.page-about .ab-models {
  padding: clamp(60px, 9vw, 110px) 0;
  background: linear-gradient(190deg, var(--indigo-deep) 0%, #191A44 55%, var(--deep-navy) 100%);
}

.page-about .ab-model-grid {
  display: grid;
  gap: 16px;
  margin-bottom: clamp(36px, 5vw, 58px);
}

.page-about .ab-model {
  padding: 26px 24px;
  border: 1px solid rgba(185, 203, 222, 0.18);
  border-radius: var(--radius-l);
  background: linear-gradient(165deg, rgba(8, 24, 46, 0.85), rgba(35, 35, 94, 0.55));
}

.page-about .ab-model-title {
  margin: 16px 0 0;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .ab-model p {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-text);
}

/* ---------- 05 合作生态 ---------- */

.page-about .ab-partners {
  padding: clamp(60px, 9vw, 110px) 0;
  background: var(--deep-navy);
}

.page-about .ab-partner-grid {
  display: grid;
  gap: 16px;
}

.page-about .ab-partner {
  padding: 28px 24px;
  border: 1px solid var(--ab-hair);
  border-radius: var(--radius-l);
  background: var(--ab-panel);
}

.page-about .ab-partner-num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(34px, 5.4vw, 46px);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan-glow);
}

.page-about .ab-partner-title {
  margin: 14px 0 0;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--paper);
}

.page-about .ab-partner-text {
  margin: 12px 0 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-text);
}

.page-about .ab-output {
  margin-top: 20px;
  padding: clamp(24px, 3.5vw, 34px);
  border: 1px solid var(--ab-hair-strong);
  border-radius: var(--radius-l);
  background: linear-gradient(150deg, rgba(16, 42, 76, 0.7), rgba(8, 24, 46, 0.6));
}

.page-about .ab-output-title {
  margin: 0 0 20px;
  font-size: 18px;
  font-weight: 700;
  color: var(--paper);
}

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

.page-about .ab-output-list li {
  padding-left: 18px;
  position: relative;
  font-size: 16px;
  line-height: 1.85;
  color: var(--mist-text);
}

.page-about .ab-output-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 8px;
  height: 2px;
  background: var(--cyan-glow);
}

.page-about .ab-output-list strong {
  font-family: var(--font-mono);
  font-weight: 700;
  color: var(--paper);
}

.page-about .ab-output-note {
  margin: 22px 0 0;
  padding-top: 18px;
  border-top: 1px solid var(--ab-hair);
  font-size: 16px;
  line-height: 1.9;
  color: var(--mist-text);
}

.page-about .ab-output-note a {
  color: var(--cyan-glow);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 243, 214, 0.42);
  transition: border-color 0.24s var(--ease);
}

.page-about .ab-output-note a:hover,
.page-about .ab-output-note a:focus-visible {
  border-bottom-color: var(--cyan-glow);
  outline: none;
}

/* ---------- 06 联系 ---------- */

.page-about .ab-contact {
  padding: clamp(60px, 9vw, 110px) 0 clamp(72px, 10vw, 120px);
  background:
    radial-gradient(70% 70% at 0% 100%, rgba(90, 31, 53, 0.55) 0%, rgba(90, 31, 53, 0) 65%),
    var(--deep-navy);
}

.page-about .ab-contact-card {
  position: relative;
  border: 1px solid rgba(185, 203, 222, 0.26);
  border-radius: var(--radius-l);
  background: linear-gradient(150deg, rgba(90, 31, 53, 0.9) 0%, rgba(16, 42, 76, 0.92) 100%);
  padding: clamp(26px, 4.5vw, 52px);
}

.page-about .ab-contact-title {
  margin: 0;
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 900;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .ab-contact-text {
  margin: 18px 0 0;
  max-width: 44em;
  font-size: 17px;
  line-height: 1.95;
  color: var(--mist-text);
}

.page-about .ab-contact-rows {
  margin-top: clamp(26px, 4vw, 38px);
  display: grid;
  gap: 16px;
}

.page-about .ab-contact-row {
  display: grid;
  gap: 6px;
  padding-top: 14px;
  border-top: 1px solid rgba(185, 203, 222, 0.24);
}

.page-about .ab-contact-label {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--pulse-amber);
}

.page-about .ab-contact-value {
  font-size: 16px;
  line-height: 1.8;
  color: var(--paper);
  overflow-wrap: anywhere;
}

.page-about .ab-contact-actions {
  margin-top: clamp(26px, 4vw, 36px);
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 响应式 ---------- */

@media (min-width: 700px) {
  .page-about .ab-partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .ab-output-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 28px;
  }

  .page-about .ab-contact-row {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 4px 18px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(268px, 0.85fr);
    align-items: start;
  }

  .page-about .ab-process-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 340px);
    align-items: start;
  }

  .page-about .ab-tl-item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: 0 22px;
  }

  .page-about .ab-tl-year {
    font-size: 16px;
    padding-top: 5px;
  }

  .page-about .ab-tl-body {
    padding: 0 0 44px 28px;
  }

  .page-about .ab-step {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 0 20px;
  }

  .page-about .ab-steps {
    padding-right: clamp(0px, 3vw, 40px);
  }
}

@media (max-width: 640px) {
  .page-about {
    --gutter: 18px;
  }

  .page-about .ab-tl-more {
    max-height: none;
    opacity: 1;
    margin-top: 12px;
  }

  .page-about .ab-fact-num {
    font-size: 22px;
  }

  .page-about .ab-role summary {
    grid-template-columns: 24px minmax(0, 1fr) auto;
    gap: 10px;
    padding: 16px;
  }

  .page-about .ab-role summary::after {
    display: none;
  }

  .page-about .ab-role-body {
    padding: 0 16px 18px;
  }

  .page-about .ab-contact-actions .btn {
    flex: 1 1 auto;
    text-align: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}