.page-about {
  --about-section-pad: clamp(4.5rem, 10vw, 8rem);
  --about-orb-purple: rgba(108, 59, 244, 0.24);
  --about-orb-gold: rgba(251, 191, 36, 0.16);
  --about-white-soft: rgba(244, 246, 252, 0.88);
  background: var(--jnh-bg-light);
  overflow-x: clip;
}

@media (min-width: 600px) {
  .page-about {
    --about-section-pad: clamp(5rem, 9vw, 8rem);
  }
}

/* ===== Hero 首屏 ===== */
.page-about .about-hero {
  position: relative;
  padding: clamp(3rem, 6vw, 5rem) 0 clamp(3.5rem, 7vw, 6rem);
  color: var(--jnh-white);
  background:
    radial-gradient(90rem 42rem at 92% -12%, rgba(108, 59, 244, 0.48), transparent 62%),
    radial-gradient(52rem 30rem at 6% 118%, rgba(251, 191, 36, 0.14), transparent 58%),
    var(--jnh-bg-deep);
  margin-bottom: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 46%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, rgba(108, 59, 244, 0.18) 45%, transparent 92%);
  clip-path: polygon(32% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2.5rem;
  position: relative;
  z-index: 1;
}

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 4rem;
    align-items: center;
  }
}

.page-about .about-hero__copy {
  max-width: 42rem;
}

.page-about .about-hero__copy .jnh-breadcrumb {
  margin-bottom: 2.25rem;
}

.page-about .about-hero__title {
  margin: 1.5rem 0 1.75rem;
  font-family: var(--jnh-font-display);
  font-size: clamp(2.75rem, 6.4vw, 5.5rem);
  letter-spacing: -0.04em;
  line-height: 1.06;
}

.page-about .about-hero__line-serif {
  display: block;
  font-family: var(--jnh-font-serif);
  font-size: 0.34em;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--jnh-gold);
  margin-bottom: 0.6rem;
}

.page-about .about-hero__line-main {
  display: block;
  font-weight: 700;
  letter-spacing: -0.03em;
}

.page-about .about-hero__line-sub {
  display: block;
  font-weight: 200;
  color: rgba(244, 246, 252, 0.82);
  margin-top: 0.3rem;
}

.page-about .about-hero__lead {
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  line-height: 1.8;
  color: rgba(244, 246, 252, 0.86);
  max-width: 42ch;
  margin-bottom: 2.2rem;
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
}

.page-about .about-hero__chips .jnh-tag {
  background: rgba(255, 255, 255, 0.09);
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--jnh-bg-light);
  border-radius: 999px;
  padding: 0.4rem 0.85rem;
  font-family: var(--jnh-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  white-space: nowrap;
}

.page-about .about-hero__visual {
  position: relative;
  width: 100%;
  max-width: 560px;
  margin-inline: auto;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 900 / 600;
  object-fit: cover;
  border-radius: var(--jnh-radius);
  clip-path: polygon(8% 0, 100% 0, 100% 92%, 0 100%);
  box-shadow: 0 32px 70px rgba(6, 9, 24, 0.45);
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: -1.25rem -1.25rem auto auto;
  width: 40%;
  aspect-ratio: 1;
  border-radius: 50%;
  border: 1px dashed rgba(251, 191, 36, 0.45);
  z-index: -1;
  animation: about-orb-spin 26s linear infinite;
}

.page-about .about-hero__version {
  position: absolute;
  left: 1.5rem;
  top: 1.5rem;
  z-index: 2;
  padding: 0.45rem 0.85rem;
  font-family: var(--jnh-font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  background: rgba(11, 16, 38, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: 999px;
  color: var(--jnh-bg-light);
  backdrop-filter: blur(4px);
}

@keyframes about-orb-spin {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* ===== 章节目录 ===== */
.page-about .about-dir {
  position: sticky;
  top: var(--jnh-header-h);
  z-index: 35;
  background: rgba(244, 246, 252, 0.9);
  backdrop-filter: blur(8px);
  border-block: 1px solid rgba(11, 16, 38, 0.07);
  padding: 0.6rem 0;
}

.page-about .about-dir__list {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.page-about .about-dir__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-dir__list li {
  flex: 0 0 auto;
}

.page-about .about-dir__list a {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.5rem 0.95rem;
  border-radius: 999px;
  color: var(--jnh-text);
  font-family: var(--jnh-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-decoration: none;
  white-space: nowrap;
  border: 1px solid transparent;
  transition: background 0.25s var(--jnh-ease), color 0.25s var(--jnh-ease), border-color 0.25s var(--jnh-ease);
}

.page-about .about-dir__list a:hover,
.page-about .about-dir__list a:focus-visible {
  background: var(--jnh-white);
  color: var(--jnh-accent);
  border-color: rgba(108, 59, 244, 0.18);
}

.page-about .about-dir__list a span {
  color: var(--jnh-gold);
  font-weight: 700;
}

@media (min-width: 1680px) {
  .page-about .about-dir {
    position: fixed;
    top: 50%;
    left: max(2rem, calc((100vw - var(--jnh-content-max)) / 2 - 250px));
    transform: translateY(-50%);
    background: transparent;
    backdrop-filter: none;
    border: none;
    padding: 0;
    width: 190px;
  }

  .page-about .about-dir__list {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.45rem;
    overflow: visible;
  }

  .page-about .about-dir__list a {
    border: 1px solid rgba(11, 16, 38, 0.08);
    background: rgba(255, 255, 255, 0.72);
  }
}

/* ===== V2.0 起点 ===== */
.page-about .about-origin {
  position: relative;
  overflow: hidden;
}

.page-about .about-origin::before {
  content: "";
  position: absolute;
  width: 22rem;
  height: 22rem;
  right: -6rem;
  bottom: -8rem;
  border-radius: 50%;
  background: rgba(108, 59, 244, 0.08);
  filter: blur(22px);
  pointer-events: none;
}

.page-about .about-origin__grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

@media (min-width: 900px) {
  .page-about .about-origin__grid {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 3.5rem;
  }
}

.page-about .about-origin__mark {
  font-family: var(--jnh-font-serif);
  font-size: clamp(4.5rem, 10vw, 7.5rem);
  line-height: 1;
  color: var(--jnh-accent);
  opacity: 0.42;
  letter-spacing: -0.04em;
}

.page-about .about-origin__text {
  margin-top: 1.25rem;
  max-width: 60ch;
  color: var(--jnh-text);
}

.page-about .about-origin__steps {
  list-style: none;
  counter-reset: about-step;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-origin__steps li {
  counter-increment: about-step;
  position: relative;
  padding: 1.15rem 1.25rem 1.15rem 3.5rem;
  background: var(--jnh-white);
  border: 1px solid rgba(11, 16, 38, 0.06);
  border-radius: var(--jnh-radius-sm);
  line-height: 1.65;
  color: var(--jnh-text);
  box-shadow: 0 6px 24px rgba(11, 16, 38, 0.05);
  transition: border-color 0.25s var(--jnh-ease), box-shadow 0.25s var(--jnh-ease);
}

.page-about .about-origin__steps li:hover {
  border-color: rgba(108, 59, 244, 0.28);
  box-shadow: 0 10px 32px rgba(11, 16, 38, 0.09);
}

.page-about .about-origin__steps li::before {
  content: counter(about-step, decimal-leading-zero);
  position: absolute;
  left: 1.2rem;
  top: 1.3rem;
  font-family: var(--jnh-font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--jnh-accent);
}

.page-about .about-origin__steps strong {
  color: var(--jnh-bg-deep);
  font-weight: 700;
}

/* ===== 演进脉络 ===== */
.page-about .about-evolution {
  background: var(--jnh-white);
}

.page-about .about-evolution__head {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

@media (min-width: 768px) {
  .page-about .about-evolution__head {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
  }
}

.page-about .about-evolution__note {
  font-family: var(--jnh-font-mono);
  font-size: 0.7rem;
  color: var(--jnh-text);
  border-left: 2px solid var(--jnh-gold);
  padding-left: 0.85rem;
  margin: 0;
}

.page-about .about-timeline {
  display: grid;
  gap: 1rem;
  margin: 2.5rem 0;
}

@media (min-width: 860px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
    position: relative;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 2.1rem;
    left: 3%;
    right: 3%;
    height: 2px;
    background: linear-gradient(90deg, var(--jnh-accent) 0%, var(--jnh-gold) 100%);
    opacity: 0.22;
    pointer-events: none;
  }
}

.page-about .about-timeline__item {
  background: var(--jnh-bg-light);
  border: 1px solid rgba(11, 16, 38, 0.06);
  border-radius: var(--jnh-radius-sm);
  overflow: hidden;
  transition: border-color 0.3s var(--jnh-ease), box-shadow 0.3s var(--jnh-ease);
}

.page-about .about-timeline__item:hover {
  border-color: rgba(108, 59, 244, 0.25);
  box-shadow: 0 12px 32px rgba(11, 16, 38, 0.08);
}

.page-about .about-timeline__item--current {
  border-color: rgba(108, 59, 244, 0.35);
}

@media (min-width: 860px) {
  .page-about .about-timeline__item {
    background: var(--jnh-white);
  }
}

.page-about .about-timeline__head {
  list-style: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 1.25rem 1.25rem 1rem;
  user-select: none;
}

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

.page-about .about-timeline__head::marker {
  display: none;
}

.page-about .about-timeline__badge {
  flex: 0 0 auto;
  font-family: var(--jnh-font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--jnh-white);
  background: var(--jnh-bg-deep);
  border-radius: 999px;
  padding: 0.35rem 0.75rem;
}

.page-about .about-timeline__item--current .about-timeline__badge {
  background: var(--jnh-accent);
}

@media (min-width: 860px) {
  .page-about .about-timeline__badge {
    border: 3px solid var(--jnh-white);
    box-shadow: 0 0 0 1px rgba(108, 59, 244, 0.12);
  }
}

.page-about .about-timeline__name {
  flex: 1 1 auto;
  font-weight: 700;
  color: var(--jnh-bg-deep);
  font-size: 0.95rem;
  line-height: 1.4;
}

.page-about .about-timeline__mark {
  flex: 0 0 auto;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--jnh-gold);
  opacity: 0.7;
  transform-origin: center;
  transition: transform 0.3s var(--jnh-ease), opacity 0.3s var(--jnh-ease);
}

.page-about .about-timeline__item[open] .about-timeline__mark {
  transform: rotate(45deg) scale(1.25);
  opacity: 1;
}

.page-about .about-timeline__body {
  padding: 0 1.25rem 1.2rem;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--jnh-text);
  max-width: 55ch;
}

.page-about .about-timeline__body p {
  margin: 0;
}

.page-about .about-evolution__figure {
  display: grid;
  gap: 1.25rem;
  margin: 3.5rem 0 0;
}

@media (min-width: 768px) {
  .page-about .about-evolution__figure {
    grid-template-columns: minmax(0, 720px) minmax(0, 1fr);
    align-items: center;
    gap: 2.5rem;
  }
}

.page-about .about-evolution__imgwrap {
  overflow: hidden;
  border-radius: var(--jnh-radius);
  background: var(--jnh-bg-light);
  transform: rotate(-1deg);
}

.page-about .about-evolution__imgwrap img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 720 / 420;
  object-fit: cover;
  border-radius: var(--jnh-radius);
}

.page-about .about-evolution__figure figcaption {
  font-family: var(--jnh-font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  line-height: 1.7;
  color: var(--jnh-text);
  border-left: 2px solid var(--jnh-gold);
  padding-left: 1rem;
  max-width: 30ch;
}

/* ===== 服务理念 ===== */
.page-about .about-philosophy {
  position: relative;
  color: var(--jnh-white);
  background:
    radial-gradient(64rem 32rem at 100% 0%, rgba(108, 59, 244, 0.36), transparent 62%),
    radial-gradient(36rem 22rem at 0% 100%, rgba(251, 191, 36, 0.1), transparent 58%),
    var(--jnh-bg-deep);
}

.page-about .about-philosophy .jnh-kicker {
  color: var(--jnh-gold);
}

.page-about .about-philosophy .jnh-title {
  color: var(--jnh-white);
}

.page-about .about-philosophy__grid {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 900px) {
  .page-about .about-philosophy__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 5rem;
    align-items: start;
  }
}

.page-about .about-philosophy__lead {
  font-size: 1.05rem;
  line-height: 1.85;
  color: rgba(244, 246, 252, 0.85);
  max-width: 42ch;
}

.page-about .about-philosophy__note {
  margin-top: 1rem;
  font-family: var(--jnh-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  line-height: 1.8;
  color: rgba(244, 246, 252, 0.72);
  border-left: 2px solid var(--jnh-gold);
  padding-left: 0.85rem;
  max-width: 46ch;
}

.page-about .about-philosophy__banner {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 640 / 240;
  object-fit: cover;
  border-radius: var(--jnh-radius-sm);
  margin-top: 1.5rem;
  box-shadow: 0 24px 60px rgba(6, 9, 24, 0.4);
}

.page-about .about-philosophy__stats {
  margin: 0;
  display: grid;
  gap: 1rem;
}

@media (min-width: 600px) {
  .page-about .about-philosophy__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: var(--jnh-radius-sm);
  padding: 1.5rem 1.5rem 1.25rem;
  transition: border-color 0.3s var(--jnh-ease), background 0.3s var(--jnh-ease), transform 0.3s var(--jnh-ease);
}

.page-about .about-stat:hover {
  border-color: rgba(108, 59, 244, 0.55);
  background: rgba(255, 255, 255, 0.09);
  transform: translateY(-3px);
}

.page-about .about-stat dt {
  font-family: var(--jnh-font-mono);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--jnh-gold-soft);
  opacity: 0.75;
}

.page-about .about-stat dd {
  margin: 0;
  font-family: var(--jnh-font-display);
  font-size: clamp(2.2rem, 4vw, 3.4rem);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--jnh-gold-soft);
}

.page-about .about-stat > span {
  font-size: 0.82rem;
  line-height: 1.6;
  color: rgba(244, 246, 252, 0.7);
}

/* ===== 品牌身份 ===== */
.page-about .about-identity__grid {
  display: grid;
  gap: 2.5rem;
}

@media (min-width: 900px) {
  .page-about .about-identity__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 4rem;
    align-items: start;
  }
}

.page-about .about-identity__lead {
  font-weight: 700;
  color: var(--jnh-bg-deep);
  font-size: 1.15rem;
}

.page-about .about-identity__text {
  color: var(--jnh-text);
  margin-top: 1.1rem;
  max-width: 58ch;
  line-height: 1.8;
}

.page-about .about-identity__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

.page-about .about-identity__actions .jnh-btn--ghost {
  border-color: rgba(108, 59, 244, 0.4);
  color: var(--jnh-accent);
}

.page-about .about-identity__aside {
  position: relative;
  overflow: hidden;
  background: var(--jnh-bg-deep);
  border-radius: var(--jnh-radius);
  padding: 2rem 2rem 1.75rem;
  color: var(--jnh-white);
}

.page-about .about-identity__aside::before {
  content: "";
  position: absolute;
  right: -4rem;
  top: -4rem;
  width: 13rem;
  height: 13rem;
  border-radius: 50%;
  background: var(--jnh-accent);
  opacity: 0.32;
  filter: blur(3px);
  pointer-events: none;
}

.page-about .about-identity__aside-title {
  position: relative;
  font-family: var(--jnh-font-serif);
  font-size: 1.5rem;
  letter-spacing: 0.02em;
  color: var(--jnh-gold);
  margin-bottom: 1.4rem;
}

.page-about .about-identity__links {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-identity__links a {
  display: block;
  padding: 0.85rem 1rem;
  border-radius: var(--jnh-radius-sm);
  border: 1px solid rgba(255, 255, 255, 0.12);
  color: rgba(244, 246, 252, 0.85);
  font-size: 0.95rem;
  text-decoration: none;
  transition: border-color 0.25s var(--jnh-ease), color 0.25s var(--jnh-ease), transform 0.25s var(--jnh-ease);
}

.page-about .about-identity__links a:hover,
.page-about .about-identity__links a:focus-visible {
  border-color: var(--jnh-gold);
  color: var(--jnh-white);
  transform: translateX(3px);
}

/* ===== 返回顶部 ===== */
.page-about .about-totop {
  position: fixed;
  right: 1.5rem;
  bottom: 1.5rem;
  z-index: 60;
  width: 3rem;
  height: 3rem;
  border: none;
  border-radius: 50%;
  background: var(--jnh-accent);
  color: var(--jnh-white);
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  box-shadow: 0 14px 36px rgba(108, 59, 244, 0.38);
  transition: background 0.25s var(--jnh-ease), transform 0.25s var(--jnh-ease);
}

.page-about .about-totop:hover,
.page-about .about-totop:focus-visible {
  background: var(--jnh-accent-dark);
  transform: translateY(-3px);
}

/* ===== data-reveal 渐进增强 ===== */
.page-about [data-reveal] {
  opacity: 1;
  transform: none;
  transition: opacity 0.6s var(--jnh-ease), transform 0.6s var(--jnh-ease);
}

.page-about [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}