/* ===== 品牌档案 .page-about 专属样式 ===== */
.page-about {
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .breadcrumb {
  padding-top: calc(var(--header-h, 76px) + 1.5rem);
  padding-bottom: 0.5rem;
  font-size: 0.9rem;
  color: var(--fog);
}

.page-about .breadcrumb__link {
  color: var(--gold);
  text-decoration: none;
}

.page-about .breadcrumb__sep {
  margin: 0 0.5em;
  color: var(--fog);
  opacity: 0.6;
}

.page-about .toc {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin: 0.5rem auto 1.5rem;
}

/* 区块公共 */
.page-about__section-head {
  margin-bottom: 2rem;
}

.page-about__section-head .kicker {
  color: var(--purple);
}

.page-about__section-head .section-title {
  margin: 0.5rem 0 0.6rem;
}

.page-about__section-lead {
  color: var(--fog);
  max-width: 60ch;
  line-height: 1.7;
}

/* 首屏品牌宣言 */
.page-about__hero {
  position: relative;
  padding: 2.5rem 0 3rem;
  background:
    radial-gradient(circle at 88% 18%, rgba(212, 162, 78, 0.12), transparent 32%),
    radial-gradient(circle at 12% 88%, rgba(139, 48, 245, 0.1), transparent 28%);
}

.page-about__hero::after {
  content: '';
  display: block;
  height: 1px;
  margin-top: 3rem;
  background: linear-gradient(90deg, var(--gold), transparent 60%);
}

.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: stretch;
}

.page-about__hero-copy {
  position: relative;
  z-index: 2;
}

.page-about__hero-copy .kicker {
  color: var(--purple);
}

.page-about__hero-title {
  margin: 0.6rem 0 0.4rem;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 900;
  letter-spacing: 0.02em;
  color: var(--moon);
  line-height: 1.15;
}

.page-about__hero-title::after {
  content: '';
  display: block;
  width: 72px;
  height: 6px;
  margin-top: 1rem;
  background: linear-gradient(90deg, var(--gold), var(--orange));
  transform: skewX(-32deg);
}

.page-about__hero-lead {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--gold);
  margin: 1.2rem 0 0.8rem;
  line-height: 1.6;
}

.page-about__hero-desc {
  color: var(--fog);
  line-height: 1.8;
  max-width: 56ch;
}

.page-about__hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about__hero-stat {
  background: rgba(10, 20, 40, 0.75);
  border-left: 3px solid var(--gold);
  padding: 0.8rem 0.9rem;
}

.page-about__hero-stat strong {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.15rem, 4vw, 1.4rem);
  font-weight: 900;
  color: var(--gold);
  line-height: 1.2;
}

.page-about__hero-stat span {
  font-size: 0.75rem;
  color: var(--fog);
}

.page-about__hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.page-about__hero-media {
  position: relative;
}

.page-about__hero-frame {
  position: relative;
  background: linear-gradient(150deg, rgba(212, 162, 78, 0.18), rgba(139, 48, 245, 0.12) 65%);
  padding: 1rem;
  clip-path: polygon(0 0, calc(100% - 32px) 0, 100% 32px, 100% 100%, 32px 100%, 0 calc(100% - 32px));
}

.page-about__hero-frame img {
  display: block;
  width: 100%;
  height: auto;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-about__hero-mark {
  position: absolute;
  right: 0.5rem;
  bottom: 0.5rem;
  z-index: 2;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.85rem;
  letter-spacing: 0.18em;
  color: var(--night);
  background: var(--gold);
  padding: 0.35rem 0.7rem 0.35rem 1rem;
  clip-path: polygon(0 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

/* 发展历程 */
.page-about__milestones {
  position: relative;
  padding: 3rem 0;
  background:
    repeating-linear-gradient(115deg, rgba(255, 255, 255, 0.02) 0 2px, transparent 2px 36px),
    linear-gradient(125deg, rgba(139, 48, 245, 0.1), transparent 55%),
    linear-gradient(305deg, rgba(212, 162, 78, 0.07), transparent 45%);
}

.page-about__timeline {
  position: relative;
  padding: 1rem 0 1.5rem;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 24px;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--gold), var(--purple) 55%, rgba(139, 48, 245, 0.25));
}

.page-about__milestone {
  position: relative;
  margin: 0 0 2rem 58px;
}

.page-about__milestone::before {
  content: '';
  position: absolute;
  left: -41px;
  top: 22px;
  width: 14px;
  height: 14px;
  background: var(--gold);
  border: 2px solid var(--night);
  transform: rotate(45deg);
  box-shadow: 0 0 12px rgba(212, 162, 78, 0.55);
  z-index: 2;
}

.page-about__milestone-card {
  background: rgba(10, 20, 40, 0.82);
  border-left: 3px solid var(--gold);
  padding: 1.3rem 1.1rem;
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 14px 100%, 0 calc(100% - 14px));
  transition:
    background-color 0.2s ease,
    border-color 0.2s ease,
    transform 0.2s ease;
}

.page-about__milestone-card:hover {
  background: rgba(20, 36, 68, 0.92);
  border-left-color: var(--orange);
  border-right-color: var(--orange);
  transform: translateY(-3px);
}

.page-about__milestone-year {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.5rem;
  color: var(--gold);
  margin-bottom: 0.3rem;
  letter-spacing: 0.04em;
  line-height: 1.2;
}

.page-about__milestone-card h3 {
  color: var(--moon);
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.05rem;
  margin: 0 0 0.35rem;
}

.page-about__milestone-card p {
  color: var(--fog);
  font-size: 0.92rem;
  line-height: 1.65;
  margin: 0;
}

/* 平台规模 */
.page-about__scale {
  padding: 3.5rem 0;
  background: rgba(5, 7, 13, 0.55);
}

.page-about__scale-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

.page-about__scale-main {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about__scale-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.page-about__scale-card {
  background: rgba(10, 20, 40, 0.8);
  padding: 1.4rem 1rem;
  border-top: 3px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
}

.page-about__scale-card:nth-child(even) {
  border-top-color: var(--purple);
}

.page-about__scale-num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 5vw, 2rem);
  font-weight: 900;
  color: var(--gold);
  line-height: 1.1;
}

.page-about__scale-label {
  display: inline-block;
  margin-top: 0.4rem;
  color: var(--moon);
  font-weight: 700;
  font-size: 0.95rem;
}

.page-about__scale-card p {
  color: var(--fog);
  font-size: 0.85rem;
  margin: 0.5rem 0 0;
  line-height: 1.55;
}

.page-about__scale-note {
  color: var(--fog);
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 0.5rem 0 0;
  padding-left: 0.8rem;
  border-left: 2px solid var(--cyan);
}

.page-about__scale-chart {
  border: 1px solid rgba(212, 162, 78, 0.25);
  background: rgba(10, 20, 40, 0.5);
  padding: 0.75rem;
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
}

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

/* 技术体系 */
.page-about__tech {
  padding: 3.5rem 0;
}

.page-about__tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about__tech-card {
  position: relative;
  background: linear-gradient(135deg, rgba(10, 20, 40, 0.88), rgba(10, 20, 40, 0.7));
  padding: 1.6rem 1.3rem 1.3rem;
  border-left: 3px solid var(--purple);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 18px 100%, 0 calc(100% - 18px));
}

.page-about__tech-num {
  position: absolute;
  top: 0.75rem;
  right: 1rem;
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 900;
  color: rgba(212, 162, 78, 0.16);
  line-height: 1;
}

.page-about__tech-card h3 {
  color: var(--moon);
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 800;
  margin: 0 0 0.5rem;
}

.page-about__tech-card p {
  color: var(--fog);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

.page-about__tech-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2.5rem;
  background: rgba(139, 48, 245, 0.06);
  padding: 1.2rem;
  clip-path: polygon(0 0, calc(100% - 24px) 0, 100% 24px, 100% 100%, 24px 100%, 0 calc(100% - 24px));
}

.page-about__tech-team-media {
  overflow: hidden;
}

.page-about__tech-team-media img {
  display: block;
  width: 100%;
  height: 100%;
  min-height: 240px;
  object-fit: cover;
}

.page-about__tech-team-copy {
  align-self: center;
}

.page-about__tech-team-copy .kicker {
  color: var(--purple);
}

.page-about__tech-team-copy h3 {
  color: var(--moon);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.4rem;
  margin: 0.4rem 0 0;
}

.page-about__tech-team-copy p {
  color: var(--fog);
  line-height: 1.7;
  margin: 0.7rem 0 0;
}

.page-about__tech-team-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1rem;
}

/* 合作生态 */
.page-about__eco {
  padding: 3.5rem 0;
  background:
    radial-gradient(circle at 80% 20%, rgba(139, 48, 245, 0.13), transparent 38%),
    radial-gradient(circle at 10% 90%, rgba(255, 107, 0, 0.1), transparent 40%);
}

.page-about__eco-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about__eco-stat {
  text-align: center;
  background: rgba(5, 7, 13, 0.4);
  padding: 1.2rem 0.6rem;
  clip-path: polygon(10px 0, 100% 0, calc(100% - 10px) 100%, 0 100%);
}

.page-about__eco-stat strong {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 6vw, 2rem);
  font-weight: 900;
  color: var(--gold);
  line-height: 1.1;
}

.page-about__eco-stat span {
  font-size: 0.72rem;
  color: var(--fog);
}

.page-about__eco-types {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about__eco-type {
  background: rgba(10, 20, 40, 0.72);
  padding: 1.6rem 1.3rem;
  text-align: center;
  clip-path: polygon(0 0, calc(100% - 16px) 0, 100% 16px, 100% 100%, 16px 100%, 0 calc(100% - 16px));
  transition:
    background-color 0.2s ease,
    transform 0.2s ease;
}

.page-about__eco-type:hover {
  background: rgba(18, 34, 62, 0.85);
  transform: translateY(-3px);
}

.page-about__eco-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 0.8rem;
  font-size: 1.15rem;
  color: var(--night);
  background: linear-gradient(135deg, var(--gold), var(--orange));
  clip-path: polygon(50% 0%, 93% 25%, 93% 75%, 50% 100%, 7% 75%, 7% 25%);
}

.page-about__eco-type h3 {
  color: var(--moon);
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 800;
  margin: 0 0 0.4rem;
}

.page-about__eco-type p {
  color: var(--fog);
  font-size: 0.9rem;
  line-height: 1.6;
  margin: 0;
}

.page-about__eco-note {
  margin-top: 2rem;
  text-align: center;
  color: var(--fog);
}

.page-about__eco-note a {
  color: var(--gold);
  text-decoration: underline;
  text-underline-offset: 4px;
}

/* 资质荣誉 */
.page-about__honors {
  padding: 3.5rem 0 4rem;
}

.page-about__honors-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about__honor-card {
  background: rgba(10, 20, 40, 0.68);
  padding: 1.5rem 1.3rem;
  border-bottom: 3px solid var(--gold);
  clip-path: polygon(0 0, calc(100% - 18px) 0, 100% 18px, 100% 100%, 0 100%);
}

.page-about__honor-card:last-child {
  border-bottom-color: var(--purple);
}

.page-about__honor-card .tag {
  font-size: 0.95rem;
  padding: 0.45rem 0.8rem;
}

.page-about__honor-card p {
  color: var(--fog);
  margin: 0.8rem 0 0;
  line-height: 1.6;
  font-size: 0.95rem;
}

/* 平板及桌面 */
@media (min-width: 768px) {
  .page-about__hero-grid {
    grid-template-columns: 7fr 5fr;
    gap: 3rem;
  }

  .page-about__tech-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .page-about__tech-team {
    grid-template-columns: 5fr 7fr;
    padding: 1.6rem;
  }

  .page-about__tech-team-media {
    min-height: 260px;
  }

  .page-about__eco-types {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__honors-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* 宽屏桌面：时间线左右交错 */
@media (min-width: 1024px) {
  .page-about__scale-grid {
    grid-template-columns: 1fr 1fr;
    align-items: center;
  }

  .page-about__scale-chart {
    margin-left: 1.5rem;
  }

  .page-about__milestone {
    width: calc(50% - 44px);
    margin: 0 0 2.5rem;
  }

  .page-about__milestone--left {
    margin-right: auto;
    text-align: right;
  }

  .page-about__milestone--right {
    margin-left: auto;
    text-align: left;
  }

  .page-about__timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__milestone::before {
    left: auto;
    right: -51px;
  }

  .page-about__milestone--right::before {
    left: -51px;
    right: auto;
  }

  .page-about__milestone--left .page-about__milestone-card {
    border-left: 0;
    border-right: 3px solid var(--gold);
  }

  .page-about__milestone--right .page-about__milestone-card {
    border-left: 3px solid var(--purple);
  }
}