.page-about {
  --bevel: polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 0 100%);
  --bevel-sm: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  --section-space: clamp(68px, 9vw, 128px);
  background: var(--color-black);
  color: var(--color-text-light);
  overflow-x: hidden;
}

.page-about .container {
  width: min(1180px, 100% - 2 * var(--pad));
  margin-inline: auto;
}

.page-about .section {
  position: relative;
  padding-block: var(--section-space);
}

.page-about .section::after {
  content: "";
  position: absolute;
  z-index: 2;
  top: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: linear-gradient(115deg, transparent 0 48%, var(--color-gold) 48% 52%, transparent 52%);
  opacity: 0.72;
  pointer-events: none;
}

.page-about .section--green {
  background: var(--color-primary);
  color: var(--color-text-light);
}

.page-about .section--black {
  background: var(--color-black);
  color: var(--color-text-light);
}

.page-about .section--paper {
  background: var(--color-paper);
  color: var(--color-text-dark);
}

.page-about .profile-credentials {
  background: linear-gradient(140deg, var(--color-primary-dark), var(--color-primary) 72%);
}

/* 首屏封面 */
.page-about .profile-hero {
  position: relative;
  padding-block: 48px 60px;
  background:
    radial-gradient(circle at 82% 18%, rgba(212, 175, 55, 0.16), transparent 28%),
    linear-gradient(135deg, var(--color-primary-dark) 0%, var(--color-primary) 58%, var(--color-black) 132%);
  color: var(--color-text-light);
  overflow: hidden;
}

.page-about .profile-hero::before {
  content: "";
  position: absolute;
  top: -20px;
  right: -8%;
  width: 46%;
  height: 120%;
  background: repeating-linear-gradient(115deg, rgba(245, 239, 224, 0.06) 0 1px, transparent 1px 16px);
  transform: skewX(-10deg);
  pointer-events: none;
}

.page-about .profile-hero::after {
  content: "365";
  position: absolute;
  right: 4%;
  bottom: -8%;
  font-family: var(--font-display);
  font-size: clamp(10rem, 28vw, 24rem);
  line-height: 0.7;
  color: var(--color-gold);
  opacity: 0.06;
  pointer-events: none;
  z-index: 0;
}

.page-about .profile-hero-inner {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.04em;
  margin-bottom: 36px;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(212, 175, 55, 0.35);
}

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

.page-about .breadcrumb span {
  opacity: 0.72;
}

.page-about .profile-hero-grid {
  display: grid;
  gap: 30px;
}

.page-about .section-kicker {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin: 0 0 10px;
}

.page-about h1 {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 9vw, 6.4rem);
  line-height: 0.96;
  letter-spacing: 0.01em;
  text-transform: uppercase;
  margin: 0 0 18px;
}

.page-about .hero-lede {
  max-width: 58ch;
  font-size: clamp(0.98rem, 1.6vw, 1.18rem);
  line-height: 1.75;
  color: rgba(245, 239, 224, 0.85);
  margin: 0 0 28px;
}

.page-about .hero-index {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  max-width: 520px;
  padding-top: 18px;
  border-top: 1px solid rgba(212, 175, 55, 0.45);
}

.page-about .hero-index .index-meta {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: rgba(245, 239, 224, 0.8);
  line-height: 1.45;
}

.page-about .hero-index strong {
  display: block;
  font-family: var(--font-display);
  font-size: 1.45rem;
  letter-spacing: 0.02em;
  color: var(--color-gold);
  margin-bottom: 4px;
}

.page-about .hero-aside {
  display: grid;
  gap: 14px;
}

.page-about .hero-data-card {
  padding: 20px 22px;
  background: rgba(6, 61, 38, 0.55);
  border: 1px solid rgba(212, 175, 55, 0.4);
  border-left: 4px solid var(--color-gold);
  clip-path: var(--bevel);
  position: relative;
}

.page-about .hero-data-card--gold {
  border-color: rgba(245, 239, 224, 0.22);
  border-left-color: var(--color-gold);
  background: rgba(0, 0, 0, 0.24);
}

.page-about .hero-data-code {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--color-gold-dark);
}

.page-about .hero-data-value {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 3.2rem);
  line-height: 1.1;
  margin: 8px 0 4px;
  color: var(--color-gold);
}

.page-about .hero-data-label {
  font-size: 0.85rem;
  color: rgba(245, 239, 224, 0.75);
  margin: 0;
}

.page-about .hero-guide {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-top: 40px;
  padding-top: 16px;
  border-top: 1px solid rgba(212, 175, 55, 0.35);
}

.page-about .hero-guide-label {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  margin-right: 8px;
}

.page-about .hero-guide a {
  font-size: 0.86rem;
  color: rgba(245, 239, 224, 0.78);
  text-decoration: none;
  padding: 6px 12px;
  border: 1px solid rgba(245, 239, 224, 0.2);
  background: rgba(0, 0, 0, 0.14);
}

.page-about .hero-guide a:hover {
  color: var(--color-gold);
  border-color: var(--color-gold);
}

/* 章节标题组 */
.page-about .section-head {
  margin-bottom: clamp(34px, 5vw, 60px);
}

.page-about .chapter-label {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  margin-bottom: 12px;
}

.page-about .section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(2.1rem, 5vw, 4.2rem);
  line-height: 1;
  text-transform: uppercase;
  letter-spacing: 0.01em;
  margin: 0 0 12px;
}

.page-about .section-desc {
  max-width: 62ch;
  font-size: 1rem;
  line-height: 1.7;
  margin: 0;
  opacity: 0.8;
}

.page-about .section--paper .section-desc {
  opacity: 0.72;
}

/* 01 品牌故事 */
.page-about .story-grid {
  display: grid;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .story-copy p {
  margin: 0 0 1em;
  line-height: 1.8;
  color: rgba(245, 239, 224, 0.86);
}

.page-about .story-copy strong {
  color: var(--color-gold);
  font-weight: 700;
}

.page-about .story-principles {
  display: grid;
  gap: 16px;
}

.page-about .principle-card {
  padding: 18px 22px;
  background: rgba(0, 0, 0, 0.15);
  border: 1px solid rgba(212, 175, 55, 0.35);
  border-left: 4px solid var(--color-gold);
  clip-path: var(--bevel-sm);
}

.page-about .principle-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--color-gold);
  margin-bottom: 8px;
}

.page-about .principle-card h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0 0 6px;
}

.page-about .principle-card p {
  margin: 0;
  line-height: 1.6;
  font-size: 0.92rem;
  color: rgba(245, 239, 224, 0.8);
}

/* 02 发展里程碑 */
.page-about .timeline-layout {
  display: grid;
  gap: 44px;
}

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

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  top: 6px;
  bottom: 6px;
  left: 7px;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-gold), var(--color-secondary), var(--color-gold-dark));
}

.page-about .milestone {
  position: relative;
  padding: 0 0 40px 36px;
}

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

.page-about .milestone::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--color-black);
  border: 3px solid var(--color-gold);
  box-shadow: 0 0 0 6px rgba(212, 175, 55, 0.12);
  z-index: 1;
}

.page-about .milestone-year {
  position: absolute;
  right: 0;
  top: -0.24em;
  font-family: var(--font-display);
  font-size: clamp(4rem, 9vw, 8rem);
  line-height: 0.8;
  opacity: 0.08;
  pointer-events: none;
  z-index: 0;
}

.page-about .milestone time {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.12em;
  color: var(--color-gold);
  margin-bottom: 8px;
  background: rgba(212, 175, 55, 0.1);
  padding: 4px 10px;
  border: 1px solid rgba(212, 175, 55, 0.35);
}

.page-about .milestone-content {
  position: relative;
  z-index: 1;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(245, 239, 224, 0.12);
  border-left: 4px solid var(--color-secondary);
  padding: 18px 20px;
  clip-path: var(--bevel-sm);
}

.page-about .milestone h3 {
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 8px;
  letter-spacing: 0.04em;
}

.page-about .milestone p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.7;
  color: rgba(245, 239, 224, 0.78);
}

.page-about .milestone-detail {
  margin-top: 12px;
  border-top: 1px dashed rgba(212, 175, 55, 0.32);
  padding-top: 8px;
  font-size: 0.84rem;
}

.page-about .milestone-detail summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  color: var(--color-gold);
  letter-spacing: 0.06em;
  font-size: 0.74rem;
  user-select: none;
}

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

.page-about .milestone-detail summary::before {
  content: "+ ";
}

.page-about .milestone-detail[open] summary::before {
  content: "− ";
}

.page-about .milestone-detail p {
  margin: 10px 0 0;
  color: rgba(245, 239, 224, 0.72);
  line-height: 1.6;
}

.page-about .media,
.page-about .media--clip {
  display: block;
  margin: 0;
}

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

.page-about .media--clip {
  clip-path: var(--bevel);
}

.page-about .media-caption {
  margin: 10px 0 0;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  opacity: 0.72;
}

.page-about .timeline-figure {
  margin-top: 34px;
}

/* 03 资质与认证 */
.page-about .credentials-grid {
  display: grid;
  gap: 18px;
}

.page-about .credential-card {
  position: relative;
  background: rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(212, 175, 55, 0.28);
  border-top: 4px solid var(--color-gold);
  padding: 22px 20px;
  clip-path: var(--bevel);
}

.page-about .credential-card--honor {
  border-color: var(--color-gold);
}

.page-about .credential-code {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  color: var(--color-gold);
  display: block;
  margin-bottom: 12px;
}

.page-about .credential-card h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin: 0 0 8px;
}

.page-about .credential-value {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-gold);
}

.page-about .credential-card p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.65;
  color: rgba(245, 239, 224, 0.78);
}

.page-about .credential-figure img {
  aspect-ratio: 5 / 4;
}

/* 04 合作生态 */
.page-about .ecosystem-grid {
  display: grid;
  gap: 18px;
}

.page-about .eco-panel {
  position: relative;
  padding: 26px 22px;
  background: rgba(245, 239, 224, 0.72);
  border: 1px solid rgba(11, 93, 59, 0.25);
  border-top: 4px solid var(--color-gold-dark);
  clip-path: var(--bevel);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .eco-panel:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow);
}

.page-about .eco-code {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--color-gold-dark);
  border-bottom: 1px dashed rgba(11, 93, 59, 0.28);
  padding-bottom: 10px;
  margin-bottom: 16px;
}

.page-about .eco-panel h3 {
  font-family: var(--font-display);
  font-size: 1.45rem;
  margin: 0 0 10px;
}

.page-about .eco-panel p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
}

/* 05 服务承诺 */
.page-about .promise-grid {
  display: grid;
  gap: 40px;
}

.page-about .promise-copy p {
  line-height: 1.8;
  color: rgba(245, 239, 224, 0.82);
}

.page-about .promise-intro {
  margin-top: 0;
}

.page-about .promise-list {
  list-style: none;
  margin: 26px 0 34px;
  padding: 0;
}

.page-about .promise-list li {
  position: relative;
  padding: 14px 0 14px 28px;
  border-bottom: 1px solid rgba(245, 239, 224, 0.12);
  line-height: 1.7;
  font-size: 0.95rem;
}

.page-about .promise-list li::before {
  content: "/";
  position: absolute;
  left: 6px;
  top: 14px;
  color: var(--color-gold);
  font-family: var(--font-mono);
  font-weight: 700;
}

.page-about .promise-list a {
  color: var(--color-gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(212, 175, 55, 0.4);
}

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

.page-about .promise-figure img {
  aspect-ratio: 10 / 7;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 22px;
  font-family: var(--font-body);
  font-weight: 700;
  font-size: 0.92rem;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid transparent;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: background 0.25s ease, color 0.25s ease, border-color 0.25s ease;
}

.page-about .btn-primary {
  background: var(--color-gold);
  color: var(--color-black);
}

.page-about .btn-ghost {
  border-color: rgba(245, 239, 224, 0.35);
  color: var(--color-text-light);
}

.page-about .btn-primary:hover {
  background: var(--color-gold-dark);
  color: var(--color-paper);
}

.page-about .btn-ghost:hover {
  border-color: var(--color-gold);
  color: var(--color-gold);
}

/* 桌面端布局与时间线左右交替 */
@media (min-width: 760px) {
  .page-about .timeline-list::before {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about .milestone {
    width: calc(50% - 44px);
    margin-left: 0;
    padding: 0 0 44px;
  }

  .page-about .milestone:nth-child(even) {
    margin-left: calc(50% + 44px);
  }

  .page-about .milestone::before {
    left: calc(100% + 36px);
  }

  .page-about .milestone:nth-child(even)::before {
    left: -52px;
  }

  .page-about .milestone-year {
    right: 0;
  }

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

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

@media (min-width: 840px) {
  .page-about .story-grid {
    grid-template-columns: 1.05fr 0.95fr;
    align-items: start;
  }
}

@media (min-width: 880px) {
  .page-about .profile-hero-grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(280px, 0.6fr);
    align-items: end;
    column-gap: 60px;
  }
}

@media (min-width: 960px) {
  .page-about .timeline-layout {
    grid-template-columns: minmax(0, 1fr) 340px;
    align-items: start;
  }

  .page-about .timeline-figure {
    margin-top: 0;
    position: sticky;
    top: 100px;
  }

  .page-about .promise-grid {
    grid-template-columns: 1fr 0.88fr;
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .credentials-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}