.page-about {
  --about-bg-deep: #060D1A;
  --about-bg-blue: #0E2239;
  --about-accent-orange: #FF6B35;
  --about-accent-cyan: #00E5FF;
  --about-paper: #F5F0E8;
  --about-ink: #1A1A1A;
  --about-white: #FFFFFF;
  --about-gray: #8A8A8A;
  --about-border: 2px solid currentColor;
  --about-shadow-hard: 6px 6px 0 rgba(0, 0, 0, 0.35);
  --about-dur: 280ms;

  background: var(--about-bg-deep);
  color: var(--about-white);
  scroll-margin-top: 64px;
}

/* ===== 通用容器与标题体系 ===== */
.page-about .container-main {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: 20px;
}

.page-about .container-narrow {
  max-width: var(--container-narrow);
  margin-inline: auto;
  padding-inline: 20px;
}

.page-about .section {
  padding-block: 72px 40px;
}

.page-about .section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--about-accent-orange);
  border: 1px solid var(--about-accent-orange);
  padding: 4px 10px;
  margin-bottom: 16px;
}

.page-about .section-title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(28px, 4.2vw, 42px);
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--about-white);
  margin-bottom: 12px;
}

.page-about .section-sub {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.72);
  max-width: 460px;
}

.page-about .breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--about-gray);
  margin-bottom: 24px;
}

.page-about .breadcrumbs a {
  color: var(--about-gray);
  text-decoration: none;
  transition: color var(--about-dur) ease;
}

.page-about .breadcrumbs a:hover {
  color: var(--about-accent-orange);
}

.page-about .breadcrumbs .sep {
  margin-inline: 2px;
}

.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
}

.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s cubic-bezier(0.22, 1, 0.36, 1), transform 0.6s cubic-bezier(0.22, 1, 0.36, 1);
}

.page-about [data-reveal][data-revealed][data-delay] {
  transition-delay: attr(data-delay ms);
}

/* ===== 首屏 Hero ===== */
.page-about .about-hero {
  position: relative;
  padding-block: 24px 64px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 70%;
  height: 90%;
  background: radial-gradient(ellipse at center, rgba(0, 229, 255, 0.10) 0%, transparent 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid {
  display: flex;
  flex-direction: column;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__aside {
  display: none;
}

.page-about .about-hero__body {
  order: 1;
  max-width: 720px;
}

.page-about .about-hero__content {
  border-left: 3px solid var(--about-accent-orange);
  padding-left: 16px;
}

.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(30px, 5vw, 52px);
  letter-spacing: -0.03em;
  line-height: 1.1;
  color: var(--about-white);
  margin-bottom: 20px;
}

.page-about .about-hero__lead {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 17px;
  line-height: 1.6;
  color: var(--about-accent-cyan);
  margin-bottom: 12px;
}

.page-about .about-hero__desc {
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.78);
  max-width: 580px;
}

.page-about .about-hero__media {
  order: 0;
  margin-bottom: 24px;
  position: relative;
}

.page-about .img-frame {
  position: relative;
  display: block;
  overflow: hidden;
  border: var(--about-border);
  border-color: rgba(255, 255, 255, 0.24);
  background: var(--about-bg-blue);
  box-shadow: var(--about-shadow-hard);
  max-width: 360px;
}

.page-about .img-frame::before {
  content: attr(data-caption);
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--about-bg-deep);
  background: var(--about-accent-cyan);
  padding: 4px 8px;
  border-right: 1px solid rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid rgba(0, 0, 0, 0.3);
}

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

.page-about .img-frame-tall img {
  aspect-ratio: 800 / 600;
}

.page-about .about-hero__media .img-frame-tall {
  max-width: 360px;
  height: auto;
}

.page-about .hero-stamp {
  display: inline-block;
  position: absolute;
  bottom: -12px;
  right: 8px;
  background: var(--about-accent-orange);
  color: var(--about-bg-deep);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.2;
  text-align: center;
  padding: 10px 14px;
  border: 2px solid var(--about-bg-deep);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.4);
  z-index: 3;
}

/* ===== 品牌理念 ===== */
.page-about .about-philosophy {
  background: var(--about-paper);
  color: var(--about-ink);
}

.page-about .about-philosophy__grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-about .about-philosophy__side .section-title {
  color: var(--about-ink);
}

.page-about .about-philosophy__side .section-tag {
  border-color: var(--about-ink);
  color: var(--about-ink);
}

.page-about .about-philosophy__inner {
  border-top: 3px solid var(--about-ink);
}

.page-about .philosophy-principle {
  display: flex;
  gap: 14px;
  padding-block: 20px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.14);
}

.page-about .principle-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 500;
  color: var(--about-bg-blue);
  flex-shrink: 0;
  min-width: 44px;
  padding-top: 4px;
}

.page-about .principle-body h3 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 19px;
  letter-spacing: -0.01em;
  margin-bottom: 8px;
  color: var(--about-ink);
}

.page-about .principle-body p {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(0, 0, 0, 0.72);
  max-width: 720px;
}

.page-about .philosophy-quote {
  margin-block: 28px;
  border-left: 3px solid var(--about-accent-orange);
  padding: 8px 0 8px 16px;
}

.page-about .philosophy-quote p {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.5;
  color: var(--about-ink);
  margin-bottom: 6px;
}

.page-about .philosophy-quote cite {
  font-family: var(--font-mono);
  font-size: 12px;
  color: rgba(0, 0, 0, 0.55);
  font-style: normal;
}

/* ===== 数据规模 ===== */
.page-about .about-stats {
  background: var(--about-bg-deep);
}

.page-about .about-stats__heading {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin-bottom: 32px;
}

.page-about .stats-board {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 32px;
  border-top: 2px solid rgba(255, 255, 255, 0.2);
  border-bottom: 2px solid rgba(255, 255, 255, 0.2);
  padding-block: 20px;
}

.page-about .stats-board__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  background: var(--about-bg-blue);
  border: 1px solid rgba(255, 255, 255, 0.18);
  padding: 16px 14px;
  min-height: 140px;
  justify-content: center;
}

.page-about .stats-board__item--primary {
  grid-column: span 2;
  background: var(--about-accent-orange);
  border-color: transparent;
}

.page-about .stats-board__item--primary .data-num {
  color: var(--about-bg-deep);
  font-size: 38px;
}

.page-about .stats-board__item--primary .data-label {
  color: var(--about-bg-deep);
}

.page-about .stats-board__item--primary .stats-board__note {
  color: rgba(0, 0, 0, 0.72);
}

.page-about .stats-board__item .data-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  color: var(--about-accent-cyan);
  line-height: 1;
}

.page-about .stats-board__item .data-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 15px;
  color: var(--about-white);
}

.page-about .stats-board__note {
  font-size: 12px;
  line-height: 1.55;
  color: var(--about-gray);
}

.page-about .about-stats__media {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .img-frame-wide {
  max-width: 100%;
}

.page-about .img-frame-wide img {
  aspect-ratio: 1000 / 600;
}

.page-about .stats-aside-card {
  background: rgba(0, 229, 255, 0.12);
  border-left: 3px solid var(--about-accent-cyan);
  padding: 16px;
}

.page-about .stats-aside-card__label {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--about-accent-cyan);
  margin-bottom: 6px;
}

.page-about .stats-aside-card__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  color: var(--about-white);
  margin-bottom: 6px;
}

.page-about .stats-aside-card p {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.72);
}

/* ===== 发展历程（时间线） ===== */
.page-about .about-timeline-section {
  background: var(--about-bg-blue);
  padding-block: 72px 64px;
  border-top: 1px solid rgba(255, 255, 255, 0.2);
  border-bottom: 1px solid rgba(255, 255, 255, 0.2);
}

.page-about .about-timeline__layout {
  display: flex;
  flex-direction: column;
}

.page-about .about-timeline__head {
  margin-bottom: 40px;
}

.page-about .timeline {
  border-left: 3px solid var(--about-accent-orange);
  padding-left: 20px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: -17px;
  top: 0;
  bottom: 0;
  width: 9px;
  background: var(--about-bg-blue);
  box-shadow: 0 0 0 2px var(--about-accent-orange);
  border-radius: 50%;
}

.page-about .timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .timeline__item {
  position: relative;
  padding-left: 20px;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.14);
  padding: 16px;
  transition: border-color var(--about-dur) ease;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -20px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--about-accent-orange);
  border: 2px solid var(--about-bg-blue);
  box-shadow: 0 0 0 2px var(--about-accent-orange);
}

.page-about .timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 16px;
  color: var(--about-accent-cyan);
  margin-bottom: 6px;
}

.page-about .timeline__heading {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 17px;
  color: var(--about-white);
  margin-bottom: 4px;
}

.page-about .timeline__desc {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.7);
}

/* ===== 核心能力 ===== */
.page-about .about-capability {
  background: var(--about-bg-deep);
}

.page-about .about-capability__grid {
  display: flex;
  flex-direction: column;
  gap: 32px;
}

.page-about .about-capability__intro .img-frame {
  margin-top: 24px;
  max-width: 360px;
}

.page-about .about-capability__intro .img-frame img {
  aspect-ratio: 1;
}

.page-about .about-capability__list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .capability-card {
  background: var(--about-bg-blue);
  border: 1px solid rgba(255, 255, 255, 0.18);
  border-top: 3px solid var(--about-accent-cyan);
  padding: 20px 18px;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .capability-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(0, 229, 255, 0.22);
  border-color: var(--about-accent-cyan);
}

.page-about .capability-card__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 28px;
  color: var(--about-accent-orange);
  margin-bottom: 10px;
}

.page-about .capability-card h3 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 17px;
  color: var(--about-white);
  margin-bottom: 6px;
}

.page-about .capability-card p {
  font-size: 13px;
  line-height: 1.68;
  color: rgba(255, 255, 255, 0.72);
}

/* ===== 内容与生态 ===== */
.page-about .about-ecology {
  background: var(--about-paper);
  color: var(--about-ink);
  padding-block: 72px 64px;
}

.page-about .about-ecology .section-title {
  color: var(--about-ink);
}

.page-about .about-ecology .section-tag {
  border-color: var(--about-ink);
  color: var(--about-ink);
}

.page-about .about-ecology .section-sub {
  color: rgba(0, 0, 0, 0.68);
}

.page-about .about-ecology__head {
  margin-bottom: 32px;
}

.page-about .about-ecology__board {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 28px;
}

.page-about .ecology-panel {
  border: 2px solid var(--about-ink);
  background: rgba(255, 255, 255, 0.3);
  padding: 16px;
}

.page-about .ecology-panel--aside {
  background: var(--about-bg-blue);
  border-color: var(--about-bg-blue);
}

.page-about .ecology-panel--main {
  padding: 20px;
  background: rgba(255, 255, 255, 0.6);
}

.page-about .ecology-panel__code {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 14px;
  color: var(--about-accent-orange);
  margin-bottom: 8px;
}

.page-about .ecology-panel--aside .ecology-panel__code,
.page-about .ecology-panel--aside h3,
.page-about .ecology-panel--aside li {
  color: var(--about-white);
}

.page-about .ecology-panel h3 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 18px;
  margin-bottom: 12px;
}

.page-about .ecology-panel ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-about .ecology-panel ul li {
  font-size: 13px;
  line-height: 1.7;
  padding-left: 14px;
  position: relative;
  color: rgba(255, 255, 255, 0.82);
}

.page-about .ecology-panel ul li::before {
  content: "→";
  position: absolute;
  left: 0;
  color: var(--about-accent-cyan);
  font-family: var(--font-mono);
}

.page-about .ecology-panel__grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

.page-about .ecology-subpanel h4 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 15px;
  color: var(--about-ink);
  margin-bottom: 4px;
}

.page-about .ecology-subpanel p {
  font-size: 12px;
  line-height: 1.55;
  color: rgba(0, 0, 0, 0.68);
}

.page-about .about-ecology__links {
  background: var(--about-bg-blue);
  border: 1px solid rgba(255, 255, 255, 0.2);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .note-sticker {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--about-bg-blue);
  background: var(--about-accent-cyan);
  padding: 4px 8px;
  margin-bottom: 8px;
}

.page-about .about-ecology__note p {
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  max-width: 520px;
}

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

.page-about .btn {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 14px;
  line-height: 1;
  text-decoration: none;
  padding: 14px 20px;
  border: 2px solid transparent;
  transition: all 0.25s var(--ease);
}

.page-about .btn-primary {
  background: var(--about-accent-orange);
  border-color: var(--about-accent-orange);
  color: var(--about-bg-deep);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.35);
}

.page-about .btn-primary:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(0, 0, 0, 0.5);
}

.page-about .btn-ghost {
  background: transparent;
  border-color: var(--about-accent-cyan);
  color: var(--about-accent-cyan);
}

.page-about .btn-ghost:hover {
  background: var(--about-accent-cyan);
  color: var(--about-bg-deep);
}

.page-about .btn-paper {
  background: var(--about-paper);
  color: var(--about-bg-deep);
  border-color: var(--about-paper);
}

.page-about .btn-paper:hover {
  background: var(--about-white);
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 rgba(0, 0, 0, 0.35);
}

/* ===== 三步引导 ===== */
.page-about .about-guide {
  background: var(--about-paper);
  padding-block: 72px 64px;
  border-top: 3px solid var(--about-ink);
}

.page-about .about-guide .section-tag {
  border-color: var(--about-ink);
  color: var(--about-ink);
}

.page-about .about-guide__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(24px, 3.4vw, 32px);
  letter-spacing: -0.02em;
  color: var(--about-ink);
  margin-bottom: 24px;
}

.page-about .about-guide__steps {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .about-guide__step {
  background: rgba(255, 255, 255, 0.6);
  border: 1px solid rgba(0, 0, 0, 0.2);
  border-left: 3px solid var(--about-accent-orange);
  padding: 14px 16px;
}

.page-about .step-mark {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--about-bg-blue);
  margin-bottom: 4px;
}

.page-about .about-guide__step p {
  font-size: 14px;
  line-height: 1.65;
  color: rgba(0, 0, 0, 0.8);
}

.page-about .about-guide__contact {
  background: var(--about-bg-blue);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-left: 3px solid var(--about-accent-cyan);
  padding: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-guide__contact a {
  color: var(--about-accent-cyan);
  text-decoration: none;
  word-break: break-all;
}

.page-about .about-guide__contact a:hover {
  color: var(--about-white);
  text-decoration: underline;
}

/* ===== 媒体查询：宽屏 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding-block: 32px 72px;
  }

  .page-about .about-hero__grid {
    display: grid;
    grid-template-columns: 54px 1fr auto;
    gap: 20px;
    align-items: start;
  }

  .page-about .about-hero__aside {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
    padding-top: 64px;
  }

  .page-about .vertical-note {
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--about-gray);
    white-space: nowrap;
  }

  .page-about .hero-index {
    font-family: var(--font-mono);
    font-weight: 700;
    font-size: 18px;
    color: var(--about-accent-orange);
    border: 2px solid var(--about-accent-orange);
    padding: 6px 10px;
    transform: rotate(90deg);
  }

  .page-about .about-hero__body {
    grid-column: 2;
    grid-row: 1;
    max-width: 640px;
  }

  .page-about .about-hero__media {
    grid-column: 3;
    grid-row: 1;
    margin-bottom: 0;
    align-self: end;
  }

  .page-about .about-philosophy__grid {
    display: grid;
    grid-template-columns: 220px 1fr;
    gap: 48px;
  }

  .page-about .about-philosophy__side {
    position: sticky;
    top: 80px;
    align-self: start;
  }

  .page-about .about-stats__heading {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }

  .page-about .about-stats__heading .section-sub {
    text-align: right;
    max-width: 380px;
  }

  .page-about .stats-board {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .stats-board__item--primary {
    grid-column: span 1;
  }

  .page-about .about-stats__media {
    display: grid;
    grid-template-columns: 1fr 240px;
    align-items: stretch;
  }

  .page-about .stats-aside-card {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .about-timeline__layout {
    display: grid;
    grid-template-columns: 240px 1fr;
    gap: 48px;
  }

  .page-about .about-timeline__head {
    position: sticky;
    top: 80px;
    align-self: start;
  }

  .page-about .about-capability__grid {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-capability__intro {
    position: sticky;
    top: 80px;
  }

  .page-about .about-capability__list {
    grid-template-columns: 1fr 1fr;
    gap: 20px;
  }

  .page-about .about-ecology__board {
    grid-template-columns: 0.8fr 1.6fr 0.8fr;
    gap: 20px;
    align-items: stretch;
  }

  .page-about .ecology-panel--main {
    padding: 24px;
  }

  .page-about .ecology-panel--aside {
    display: flex;
    flex-direction: column;
  }

  .page-about .about-ecology__links {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .about-guide__steps {
    flex-direction: row;
    gap: 16px;
  }

  .page-about .about-guide__step {
    flex: 1;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__desc {
    font-size: 16px;
    max-width: 560px;
  }

  .page-about .section {
    padding-block: 88px 56px;
  }

  .page-about .about-timeline-section {
    padding-block: 88px 72px;
  }

  .page-about .about-ecology {
    padding-block: 88px 72px;
  }

  .page-about .about-guide {
    padding-block: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .capability-card,
  .page-about .btn,
  .page-about .breadcrumbs a,
  .page-about .about-guide__contact a {
    transition: none;
    transform: none;
  }
}