/* ========== 品牌故事页：page-about 专属样式 ========== */
.page-about {
  --about-green-soft: rgba(0, 255, 136, 0.06);
  --about-purple-soft: rgba(74, 92, 255, 0.15);
  --about-line-dim: rgba(44, 58, 94, 0.65);
  background: var(--color-base);
  color: var(--color-text);
}

/* ---------- 首屏：我们是谁 ---------- */
.page-about .about-hero {
  padding: clamp(56px, 9vw, 130px) 0 48px;
  background:
    radial-gradient(ellipse at 80% 18%, var(--about-purple-soft) 0%, transparent 45%),
    radial-gradient(ellipse at 8% 92%, var(--about-green-soft) 0%, transparent 40%);
}

.page-about .about-hero__inner {
  display: grid;
  gap: 36px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 16px;
}

.page-about .about-hero .kicker {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(32px, 6vw, 52px);
  line-height: 1.15;
  margin: 0 0 18px;
  letter-spacing: 0.02em;
}

.page-about .about-hero__lead {
  color: var(--color-green);
  font-size: 17px;
  line-height: 1.7;
  max-width: 34em;
}

.page-about .about-hero__extras {
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.8;
  max-width: 38em;
  margin-bottom: 28px;
}

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

.page-about .about-hero__stats .stat {
  min-width: 120px;
  padding: 16px 20px;
  background: rgba(18, 41, 79, 0.55);
  border: 1px solid var(--color-line);
  border-left: 3px solid var(--color-green);
  backdrop-filter: blur(4px);
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: 30px;
  line-height: 1.1;
  color: var(--color-green);
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--color-muted);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--color-line);
  background: linear-gradient(135deg, var(--color-panel), transparent 70%), var(--color-panel);
  padding: 12px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), 0 100%);
}

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

.page-about .about-hero__figure figcaption {
  padding: 12px 4px 4px;
  color: var(--color-muted);
  font-size: 12px;
  text-align: right;
  letter-spacing: 0.04em;
}

/* ---------- 品牌使命 ---------- */
.page-about .about-mission {
  padding: 96px 0;
  border-bottom: 1px solid var(--color-line);
  background: linear-gradient(180deg, transparent, var(--about-green-soft) 100%);
}

.page-about .about-mission__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-mission__title .kicker {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-mission__title h2 {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.25;
  margin: 0 0 16px;
}

.page-about .about-mission__quote {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--color-green);
}

.page-about .about-mission__body {
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.9;
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
}

/* ---------- 发展里程碑 ---------- */
.page-about .about-milestones {
  padding: 100px 0 80px;
  background:
    radial-gradient(ellipse at 90% 30%, var(--about-purple-soft) 0%, transparent 45%),
    radial-gradient(ellipse at 10% 80%, var(--about-green-soft) 0%, transparent 40%);
}

.page-about .about-milestones .section-head {
  margin-bottom: 64px;
  max-width: 720px;
}

.page-about .about-milestones .section-title {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4.6vw, 44px);
  margin: 10px 0 16px;
}

.page-about .timeline {
  position: relative;
  margin: 0;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-green) 0%, var(--color-orange) 70%, var(--color-purple) 100%);
  opacity: 0.6;
}

.page-about .timeline__item {
  display: block;
  position: relative;
  margin: 0 0 44px;
  padding-left: 56px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 24px;
  width: 12px;
  height: 12px;
  background: var(--color-green);
  outline: 2px solid rgba(0, 255, 136, 0.3);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(0, 255, 136, 0.4);
}

.page-about .timeline__item:last-of-type::before {
  background: var(--color-orange);
  outline-color: rgba(255, 107, 53, 0.35);
  box-shadow: 0 0 12px rgba(255, 107, 53, 0.4);
}

.page-about .timeline__card {
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  transition: border-color var(--transition), transform var(--transition), box-shadow var(--transition);
}

.page-about .timeline__card:hover {
  border-color: var(--color-green);
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.3);
}

.page-about .timeline__card summary {
  list-style: none;
  padding: 24px 56px 24px 24px;
  cursor: pointer;
  position: relative;
}

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

.page-about .timeline__card summary::after {
  content: "+";
  position: absolute;
  top: 22px;
  right: 20px;
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid var(--color-line);
  border-radius: 50%;
  color: var(--color-green);
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  transition: transform var(--transition), background var(--transition);
}

.page-about .timeline__card[open] summary::after {
  content: "−";
  transform: rotate(180deg);
  background: rgba(0, 255, 136, 0.1);
  border-color: rgba(0, 255, 136, 0.5);
}

.page-about .timeline__round {
  display: inline-block;
  margin-bottom: 10px;
  padding: 4px 10px;
  border: 1px solid rgba(0, 255, 136, 0.35);
  border-radius: 2px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--color-green);
  background: rgba(0, 255, 136, 0.05);
}

.page-about .timeline__card h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  line-height: 1.35;
  margin: 0 0 8px;
}

.page-about .timeline__teaser {
  margin: 0;
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.6;
}

.page-about .timeline__detail-content {
  border-top: 1px dashed var(--color-line);
  padding: 0 24px 26px;
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .milestone-figure {
  margin: 64px 0 0;
  display: grid;
  gap: 20px;
}

.page-about .milestone-figure img {
  width: 100%;
  height: auto;
  display: block;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
}

.page-about .milestone-figure figcaption {
  color: var(--color-muted);
  font-size: 13px;
  line-height: 1.7;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .milestone-figure__kicker {
  color: var(--color-orange);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .milestone-figure figcaption strong {
  color: var(--color-text);
  font-size: 18px;
  font-family: var(--font-heading);
  font-weight: 600;
}

/* ---------- 技术实力与兼容策略 ---------- */
.page-about .about-tech {
  padding: 100px 0;
  border-top: 1px solid var(--color-line);
  border-bottom: 1px solid var(--color-line);
  background:
    linear-gradient(80deg, var(--about-purple-soft) 0%, transparent 60%),
    linear-gradient(180deg, transparent, var(--about-green-soft));
}

.page-about .about-tech__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.page-about .about-tech__text .kicker {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-tech__text h2 {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4.4vw, 40px);
  margin: 0 0 18px;
  line-height: 1.25;
}

.page-about .about-tech__text > p {
  color: var(--color-text);
  font-size: 15px;
  line-height: 1.85;
  margin: 0 0 24px;
}

.page-about .about-tech__features {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
}

.page-about .about-tech__features li {
  position: relative;
  padding: 12px 0 12px 28px;
  border-bottom: 1px solid var(--about-line-dim);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-tech__features li:last-child {
  border-bottom: 0;
}

.page-about .about-tech__features li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 23px;
  width: 7px;
  height: 7px;
  background: var(--color-green);
  transform: rotate(45deg);
  opacity: 0.8;
}

.page-about .about-tech__note {
  padding: 18px 20px;
  border-left: 3px solid var(--color-orange);
  background: rgba(255, 107, 53, 0.06);
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-tech__note .kicker {
  display: block;
  margin-bottom: 6px;
  color: var(--color-orange);
}

.page-about .about-tech__note p {
  margin: 0 0 10px;
}

.page-about .about-tech__more {
  color: var(--color-green);
  text-decoration: underline;
  font-size: 14px;
}

.page-about .about-tech__more:hover {
  color: var(--color-orange);
}

.page-about .about-tech__figure {
  margin: 0;
  padding: 14px;
  border: 1px solid var(--color-line);
  background: var(--color-panel);
  clip-path: polygon(0 16px, 16px 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

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

.page-about .about-tech__figure figcaption {
  padding: 14px 2px 2px;
  color: var(--color-muted);
  font-size: 12px;
  text-align: right;
}

/* ---------- 资质与认证体系 ---------- */
.page-about .about-credentials {
  padding: 100px 0;
  background:
    radial-gradient(ellipse at 15% 45%, var(--about-green-soft) 0%, transparent 45%),
    radial-gradient(ellipse at 85% 65%, var(--about-purple-soft) 0%, transparent 45%);
}

.page-about .about-credentials .section-head {
  margin-bottom: 40px;
}

.page-about .credential-grid {
  display: grid;
  gap: 20px;
}

.page-about .credential-card {
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  padding: 28px 26px;
  transition: transform var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about .credential-card:hover {
  transform: translateY(-3px);
  border-color: var(--color-green);
  box-shadow: 0 10px 24px rgba(0, 0, 0, 0.25);
}

.page-about .credential-card__code {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--color-green);
  letter-spacing: 0.06em;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px dashed var(--color-line);
  word-break: break-all;
}

.page-about .credential-card h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  margin: 0 0 10px;
}

.page-about .credential-card p {
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
}

.page-about .credential-card p a {
  color: var(--color-green);
  text-decoration: underline;
}

.page-about .credential-card p a:hover {
  color: var(--color-orange);
}

/* ---------- 合作生态 ---------- */
.page-about .about-ecosystem {
  padding: 100px 0;
  border-bottom: 1px solid var(--color-line);
}

.page-about .about-ecosystem .section-head {
  margin-bottom: 48px;
}

.page-about .ecosystem-layout {
  display: grid;
  gap: 40px;
}

.page-about .ecosystem-steps {
  display: grid;
  gap: 16px;
}

.page-about .ecosystem-step {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 18px;
  padding: 22px 24px;
  background: var(--color-panel);
  border: 1px solid var(--color-line);
  transition: border-color var(--transition), transform var(--transition);
}

.page-about .ecosystem-step:hover {
  transform: translateY(-2px);
  border-color: var(--color-orange);
}

.page-about .ecosystem-step__number {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--color-green);
}

.page-about .ecosystem-step:nth-child(2) .ecosystem-step__number {
  color: var(--color-purple);
}

.page-about .ecosystem-step:nth-child(3) .ecosystem-step__number {
  color: var(--color-orange);
}

.page-about .ecosystem-step__content h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  margin: 0 0 6px;
}

.page-about .ecosystem-step__content p {
  color: var(--color-muted);
  font-size: 14px;
  line-height: 1.7;
  margin: 0;
}

.page-about .ecosystem-callout {
  background: linear-gradient(135deg, var(--about-purple-soft) 0%, var(--about-green-soft) 100%);
  border: 1px solid rgba(0, 255, 136, 0.2);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
}

.page-about .ecosystem-callout h3 {
  font-family: var(--font-heading);
  font-size: 22px;
  margin: 0;
}

.page-about .ecosystem-callout p {
  color: var(--color-text);
  font-size: 14px;
  line-height: 1.75;
  margin: 0;
}

/* ---------- 底部引导 ---------- */
.page-about .about-cta {
  padding: 90px 0;
  text-align: center;
  background: radial-gradient(ellipse at 50% 120%, rgba(0, 255, 136, 0.1) 0%, transparent 60%);
}

.page-about .about-cta .kicker {
  display: inline-block;
  margin-bottom: 12px;
}

.page-about .about-cta h2 {
  font-family: var(--font-heading);
  font-size: clamp(26px, 4.4vw, 40px);
  margin: 0 0 16px;
}

.page-about .about-cta p {
  color: var(--color-muted);
  font-size: 15px;
  line-height: 1.7;
  max-width: 42em;
  margin: 0 auto 28px;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  justify-content: center;
}

/* ---------- 桌面端：≥900px ---------- */
@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .about-hero__figure {
    clip-path: polygon(20px 0, 100% 0, 100% 100%, 0 calc(100% - 20px));
  }

  .page-about .about-mission__grid {
    grid-template-columns: 1fr 1.15fr;
    gap: 72px;
  }

  .page-about .about-mission__title {
    padding-right: 40px;
    border-right: 1px solid var(--color-line);
  }

  .page-about .timeline::before {
    left: 50%;
    transform: translateX(-1px);
  }

  .page-about .timeline__item {
    width: 50%;
    padding-left: 0;
    padding-right: 60px;
  }

  .page-about .timeline__item::before {
    left: auto;
    right: -8px;
  }

  .page-about .timeline__item:nth-of-type(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 60px;
  }

  .page-about .timeline__item:nth-of-type(even)::before {
    left: -8px;
    right: auto;
  }

  .page-about .milestone-figure {
    grid-template-columns: 0.9fr 1.1fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .milestone-figure figcaption {
    order: -1;
    align-items: flex-start;
  }

  .page-about .about-tech__grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 72px;
  }

  .page-about .about-tech__figure {
    order: 2;
  }

  .page-about .credential-grid {
    grid-template-columns: repeat(12, 1fr);
  }

  .page-about .credential-card:nth-child(1) {
    grid-column: span 5;
  }

  .page-about .credential-card:nth-child(2) {
    grid-column: span 4;
  }

  .page-about .credential-card:nth-child(3) {
    grid-column: span 3;
  }

  .page-about .ecosystem-layout {
    grid-template-columns: 1.4fr 0.6fr;
    align-items: stretch;
  }

  .page-about .ecosystem-callout {
    justify-content: center;
  }
}