.page-about {
  --about-text-subtle: rgba(255, 255, 255, 0.78);
  --about-text-faint: rgba(255, 255, 255, 0.5);
  --about-border: rgba(255, 255, 255, 0.12);
  --about-panel-bg: rgba(255, 255, 255, 0.06);
  --about-glow-orange: rgba(255, 107, 53, 0.16);
  --about-glow-gold: rgba(233, 196, 106, 0.12);
  background: var(--clr-primary);
  color: var(--clr-white);
  overflow-x: hidden;
  line-height: 1.7;
}

.page-about .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: var(--space-3);
  padding-right: var(--space-3);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-lg);
}

.page-about .about-section {
  padding-top: var(--space-5);
  padding-bottom: var(--space-5);
  scroll-margin-top: calc(var(--header-height) + 24px);
}

/* ========== 区块标题体系 ========== */
.page-about .section-head {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}

.page-about .section-head__num {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 32px;
  line-height: 1;
  color: var(--clr-accent);
  letter-spacing: -0.02em;
}

.page-about .section-head h2 {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  line-height: 1.2;
  margin: 0;
  letter-spacing: -0.01em;
}

.page-about .section-head__side {
  margin-left: auto;
  font-family: var(--font-heading);
  font-size: 11px;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--about-text-faint);
  writing-mode: vertical-rl;
  transform: rotate(180deg);
  align-self: stretch;
  white-space: nowrap;
}

.page-about .section-head--dark .section-head__side {
  color: rgba(10, 25, 47, 0.5);
}

/* ========== 通用按钮布局 ========== */
.page-about .btn {
  border-radius: var(--radius-pill);
  font-weight: 500;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .btn:hover {
  transform: translateY(-2px);
}

.page-about .btn-primary {
  box-shadow: 0 10px 24px rgba(255, 107, 53, 0.28);
}

.page-about .btn-outline {
  box-shadow: none;
}

/* ========== Hero ========== */
.page-about .about-hero {
  position: relative;
  background: linear-gradient(120deg, var(--clr-primary) 0%, var(--clr-primary-deep) 68%);
  padding-top: calc(var(--header-height) + var(--space-4));
  padding-bottom: var(--space-5);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 46%;
  height: 100%;
  background: linear-gradient(180deg, var(--about-glow-orange) 0%, rgba(255, 107, 53, 0.02) 100%);
  clip-path: polygon(100% 0, 100% 100%, 0 100%, 28% 0);
  pointer-events: none;
}

.page-about .about-hero__orb {
  position: absolute;
  border-radius: var(--radius-pill);
  filter: blur(52px);
  opacity: 0.5;
  pointer-events: none;
}

.page-about .about-hero__orb--orange {
  width: 260px;
  height: 260px;
  background: var(--clr-accent);
  top: -90px;
  left: -80px;
}

.page-about .about-hero__orb--gold {
  width: 150px;
  height: 150px;
  background: var(--clr-highlight);
  bottom: 20px;
  right: 40px;
}

.page-about .about-hero__watermark {
  position: absolute;
  right: -0.16em;
  bottom: -0.28em;
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(220px, 36vw, 460px);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.06);
  user-select: none;
  pointer-events: none;
}

.page-about .breadcrumb {
  position: relative;
  z-index: 2;
  margin-bottom: var(--space-4);
}

.page-about .breadcrumb ol {
  list-style: none;
  display: flex;
  gap: var(--space-2);
  margin: 0;
  padding: 0;
  font-size: 13px;
}

.page-about .breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .breadcrumb a:hover {
  color: var(--clr-accent);
}

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--about-text-subtle);
}

.page-about .breadcrumb li:not(:last-child)::after {
  content: ' / ';
  margin-left: var(--space-1);
  color: rgba(255, 255, 255, 0.35);
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: var(--space-4);
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--clr-accent);
  border: 1px solid rgba(255, 107, 53, 0.5);
  border-radius: var(--radius-pill);
  padding: 6px 16px;
  margin-bottom: var(--space-3);
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(32px, 5vw, 62px);
  font-weight: 700;
  line-height: 1.1;
  margin: 0 0 var(--space-3);
  max-width: 680px;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-text-subtle);
  max-width: 560px;
  margin: 0 0 var(--space-4);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-about .about-hero__visual {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--about-border);
  box-shadow: var(--shadow);
  transform: rotate(1.5deg);
  transition: transform 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.page-about .about-hero__frame:hover {
  transform: rotate(0.6deg) scale(1.01);
}

.page-about .about-hero__frame img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .about-hero__caption {
  display: inline-block;
  margin-top: var(--space-2);
  font-family: var(--font-heading);
  font-size: 13px;
  letter-spacing: 2px;
  color: var(--about-text-faint);
}

.page-about .about-hero__scroll {
  position: relative;
  z-index: 1;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  font-size: 14px;
  color: var(--about-text-subtle);
  text-decoration: none;
  transition: color var(--transition);
}

.page-about .about-hero__scroll:hover {
  color: var(--clr-accent);
}

.page-about .about-hero__scroll-line {
  width: 36px;
  height: 1px;
  background: currentColor;
  position: relative;
  overflow: hidden;
}

.page-about .about-hero__scroll-line::after {
  content: '';
  position: absolute;
  top: 0;
  left: -40%;
  width: 40%;
  height: 100%;
  background: var(--clr-accent);
  animation: about-scroll-pulse 2.4s ease-in-out infinite;
}

@keyframes about-scroll-pulse {
  0%, 100% { left: -40%; }
  50% { left: 100%; }
}

/* ========== 01 我们是谁 ========== */
.page-about .about-identity {
  background: linear-gradient(180deg, var(--clr-primary-deep) 0%, var(--clr-primary) 100%);
}

.page-about .about-identity__grid {
  display: grid;
  gap: var(--space-4);
}

.page-about .about-identity__lead-text {
  font-size: 19px;
  line-height: 1.7;
  color: var(--clr-white);
  font-weight: 500;
  margin-bottom: var(--space-3);
}

.page-about .about-identity__text p:not(.about-identity__lead-text) {
  color: var(--about-text-subtle);
  margin-bottom: var(--space-3);
}

.page-about .about-identity__aside {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  background: var(--about-panel-bg);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: var(--shadow);
}

.page-about .about-identity__year {
  font-family: var(--font-heading);
  font-size: 64px;
  font-weight: 700;
  line-height: 1;
  color: var(--clr-accent);
}

.page-about .about-identity__year-label,
.page-about .about-identity__platforms-label,
.page-about .about-identity__lang-label {
  margin: 0;
  font-size: 13px;
  color: var(--about-text-faint);
}

.page-about .about-identity__platforms {
  display: flex;
  gap: var(--space-1);
  flex-wrap: wrap;
  margin-top: var(--space-2);
}

.page-about .about-identity__platforms span {
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 1px;
  padding: 6px 14px;
  border: 1px solid var(--about-border);
  border-radius: var(--radius-pill);
  color: var(--clr-white);
}

.page-about .about-identity__lang {
  margin-top: var(--space-1);
  font-family: var(--font-heading);
  font-size: 18px;
  color: var(--clr-highlight);
}

/* ========== 02 里程碑 ========== */
.page-about .about-milestone {
  background: linear-gradient(180deg, var(--clr-primary) 0%, var(--clr-neutral-deep) 100%);
}

.page-about .about-milestone__lede {
  font-size: 17px;
  color: var(--about-text-subtle);
  max-width: 620px;
  margin: 0 0 var(--space-4);
}

.page-about .about-timeline {
  position: relative;
  padding-left: 36px;
  margin-bottom: var(--space-4);
}

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--clr-accent) 0%, var(--clr-highlight) 60%, rgba(255, 255, 255, 0.1) 100%);
  border-radius: var(--radius-pill);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: var(--space-4);
}

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

.page-about .about-timeline__marker {
  position: absolute;
  left: -30px;
  top: 20px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--clr-primary);
  border: 2px solid var(--clr-accent);
  box-shadow: 0 0 0 4px var(--about-glow-orange);
  z-index: 1;
  transition: transform var(--transition), box-shadow var(--transition);
}

.page-about .about-timeline__item:hover .about-timeline__marker {
  transform: scale(1.25);
  box-shadow: 0 0 0 6px rgba(255, 107, 53, 0.24);
}

.page-about .about-timeline__card {
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid var(--about-border);
  border-radius: var(--radius-md);
  padding: var(--space-3);
  transition: transform var(--transition), border-color var(--transition), background var(--transition);
}

.page-about .about-timeline__item:hover .about-timeline__card,
.page-about .about-timeline__item:focus-within .about-timeline__card {
  transform: translateX(6px);
  border-color: rgba(255, 107, 53, 0.55);
  background: rgba(255, 255, 255, 0.1);
}

.page-about .about-timeline__tag {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 12px;
  letter-spacing: 1px;
  color: var(--clr-accent);
  border: 1px solid rgba(255, 107, 53, 0.45);
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  margin-bottom: var(--space-2);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-heading);
  font-size: 22px;
  font-weight: 500;
  margin: 0 0 var(--space-2);
  color: var(--clr-white);
}

.page-about .about-timeline__card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-text-subtle);
  margin: 0;
}

.page-about .about-milestone__media img {
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 4;
}

/* ========== 03 品牌理念 ========== */
.page-about .about-philosophy {
  background: var(--clr-neutral-deep);
}

.page-about .about-philosophy__grid {
  display: grid;
  gap: var(--space-3);
}

.page-about .about-philosophy__item {
  position: relative;
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--about-border);
  overflow: hidden;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.page-about .about-philosophy__item:hover {
  transform: translateY(-4px);
  border-color: rgba(233, 196, 106, 0.5);
  box-shadow: 0 16px 32px rgba(0, 0, 0, 0.28);
}

.page-about .about-philosophy__index {
  position: absolute;
  right: 8px;
  top: -18px;
  font-family: var(--font-heading);
  font-size: 96px;
  font-weight: 700;
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(255, 255, 255, 0.12);
  pointer-events: none;
  user-select: none;
}

.page-about .about-philosophy__item h3 {
  font-family: var(--font-heading);
  font-size: 24px;
  font-weight: 500;
  margin: 0 0 var(--space-2);
  color: var(--clr-white);
}

.page-about .about-philosophy__item p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-text-subtle);
  margin: 0;
}

/* ========== 04 数据与成果 ========== */
.page-about .about-data {
  background: var(--clr-primary);
}

.page-about .about-data__lede {
  font-size: 17px;
  color: var(--about-text-subtle);
  max-width: 560px;
  margin: 0 0 var(--space-4);
}

.page-about .about-data__grid {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-3);
  margin: 0 0 var(--space-4);
  padding: 0;
}

.page-about .about-data__item {
  position: relative;
  border-radius: var(--radius-lg);
  padding: var(--space-4) var(--space-3);
  background: linear-gradient(160deg, rgba(255, 107, 53, 0.14) 0%, rgba(10, 25, 47, 0.2) 56%, rgba(255, 255, 255, 0.04) 100%);
  border: 1px solid rgba(255, 107, 53, 0.28);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.page-about .about-data__item:hover {
  transform: translateY(-4px);
  border-color: var(--clr-accent);
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.3);
}

.page-about .about-data__number {
  font-family: var(--font-heading);
  font-size: clamp(44px, 7vw, 72px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--clr-white);
  letter-spacing: -0.03em;
}

.page-about .about-data__unit {
  color: var(--clr-accent);
  font-size: 0.5em;
  margin-left: 2px;
  font-weight: 700;
}

.page-about .about-data__label {
  font-size: 14px;
  color: var(--about-text-subtle);
  margin-top: var(--space-1);
}

.page-about .about-data__chart {
  margin: var(--space-4) 0 0;
}

.page-about .about-data__chart img {
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--about-border);
}

.page-about .about-data__chart figcaption,
.page-about .about-ecosystem__figure figcaption {
  margin-top: var(--space-2);
  font-size: 13px;
  color: var(--about-text-faint);
}

/* ========== 05 内容生态 ========== */
.page-about .about-ecosystem {
  background: var(--clr-neutral-light);
  color: var(--clr-neutral-deep);
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
}

.page-about .about-ecosystem .section-head h2 {
  color: var(--clr-neutral-deep);
}

.page-about .about-ecosystem .section-head__num {
  color: var(--clr-accent);
}

.page-about .about-ecosystem__intro {
  margin-bottom: var(--space-4);
}

.page-about .about-ecosystem__intro p {
  font-size: 17px;
  line-height: 1.8;
  color: var(--clr-neutral-deep);
  opacity: 0.9;
  max-width: 700px;
}

.page-about .about-ecosystem__grid {
  display: grid;
  gap: var(--space-3);
}

.page-about .about-ecosystem__card {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: start;
  gap: var(--space-3);
  background: var(--clr-white);
  border: 1px solid rgba(10, 25, 47, 0.1);
  border-radius: var(--radius-lg);
  padding: var(--space-4);
  box-shadow: 0 8px 24px rgba(10, 25, 47, 0.08);
  transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition);
}

.page-about .about-ecosystem__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 32px rgba(10, 25, 47, 0.14);
  border-color: rgba(255, 107, 53, 0.5);
}

.page-about .about-ecosystem__code {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 46px;
  height: 46px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 500;
  color: var(--clr-white);
  background: linear-gradient(135deg, var(--clr-primary) 0%, var(--clr-primary-deep) 100%);
  border-radius: var(--radius-md);
}

.page-about .about-ecosystem__card h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 500;
  margin: 0 0 var(--space-1);
  color: var(--clr-primary);
}

.page-about .about-ecosystem__card p {
  font-size: 14px;
  line-height: 1.7;
  color: var(--clr-neutral-deep);
  opacity: 0.8;
  margin: 0;
}

.page-about .about-ecosystem__figure {
  margin: var(--space-5) 0 0;
}

.page-about .about-ecosystem__figure img {
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid rgba(10, 25, 47, 0.1);
}

.page-about .about-ecosystem__figure figcaption {
  color: rgba(10, 25, 47, 0.62);
}

/* ========== 行动入口 ========== */
.page-about .about-forward {
  background: var(--clr-primary);
  text-align: center;
}

.page-about .about-forward h2 {
  font-family: var(--font-heading);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 500;
  margin: 0 0 var(--space-3);
  color: var(--clr-white);
}

.page-about .about-forward p {
  font-size: 16px;
  color: var(--about-text-subtle);
  max-width: 560px;
  margin: 0 auto var(--space-4);
}

.page-about .about-forward__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
}

.page-about .about-forward__contact {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 15px;
  color: var(--clr-highlight);
  text-decoration: none;
  padding: var(--space-2) var(--space-3);
  transition: color var(--transition), transform var(--transition);
}

.page-about .about-forward__contact:hover {
  color: var(--clr-accent);
  transform: translateX(4px);
}

/* ========== 移动端优先完成，平板及以上增强 ========== */
@media (min-width: 768px) {
  .page-about .container {
    padding-left: var(--space-4);
    padding-right: var(--space-4);
  }

  .page-about .about-section {
    padding-top: var(--space-6);
    padding-bottom: var(--space-6);
  }

  .page-about .about-hero {
    padding-top: calc(var(--header-height) + var(--space-6));
    padding-bottom: var(--space-6);
  }

  .page-about .about-hero__inner {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    gap: var(--space-5);
  }

  .page-about .about-hero__lead {
    font-size: 18px;
  }

  .page-about .about-identity__grid {
    grid-template-columns: 7fr 4fr;
    align-items: start;
  }

  .page-about .about-identity__aside {
    margin-top: 0;
  }

  .page-about .about-milestone__lede {
    font-size: 19px;
  }

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

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

  .page-about .about-data__number {
    font-size: clamp(46px, 5vw, 72px);
  }

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

  .page-about .about-forward__links .btn {
    min-width: 180px;
  }
}

/* ========== 桌面端时间线交替布局 ========== */
@media (min-width: 1024px) {
  .page-about .about-timeline {
    padding-left: 0;
  }

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

  .page-about .about-timeline__item {
    width: 50%;
    padding-right: 44px;
    padding-bottom: var(--space-5);
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: 50%;
    padding-right: 0;
    padding-left: 44px;
  }

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

  .page-about .about-timeline__marker {
    left: auto;
    right: -7px;
  }

  .page-about .about-timeline__item:nth-child(even) .about-timeline__marker {
    right: auto;
    left: -7px;
  }

  .page-about .about-timeline__item:hover .about-timeline__card,
  .page-about .about-timeline__item:focus-within .about-timeline__card {
    transform: translateY(-4px);
  }

  .page-about .about-ecosystem__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }

  .page-about .about-milestone__media img {
    border-radius: var(--radius-lg);
  }
}