/* ===== page:about 品牌与价值 ===== */

.page-about {
  --about-jade: #3F6F7A;
  --about-jade-deep: #1F4A56;
  --about-glow: rgba(63, 111, 122, 0.32);
  position: relative;
  isolation: isolate;
  background:
    radial-gradient(1100px 600px at 86% -6%, rgba(63, 111, 122, 0.30), transparent 60%),
    radial-gradient(900px 620px at -10% 42%, rgba(63, 111, 122, 0.14), transparent 66%);
}

.page-about .about-shell {
  column-gap: clamp(20px, 3vw, 48px);
  row-gap: clamp(28px, 4vw, 44px);
  padding-block: clamp(20px, 3vw, 36px) clamp(56px, 8vw, 108px);
  align-items: start;
}

/* ---------- 左侧常驻栏 ---------- */

.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail__sticky {
  position: sticky;
  top: clamp(84px, 8vw, 110px);
  display: grid;
  gap: 12px;
  padding: 22px 18px 22px 22px;
  border-left: 1px solid var(--line-gold);
  background: linear-gradient(180deg, rgba(63, 111, 122, 0.18), rgba(63, 111, 122, 0.02));
  border-radius: 0 var(--radius-m) var(--radius-m) 0;
}

.page-about .about-rail__eyebrow {
  margin: 0;
  color: var(--gold-300);
  letter-spacing: 0.18em;
  font-size: 12px;
}

.page-about .about-rail__name {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(18px, 1.5vw, 22px);
  letter-spacing: 0.03em;
  color: var(--silver-100);
}

.page-about .about-rail__tag {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--silver-400);
}

.page-about .about-rail .side-index {
  position: static;
  right: auto;
  top: auto;
  bottom: auto;
  left: auto;
  transform: none;
  width: auto;
  max-width: none;
  margin: 12px 0 0;
  padding: 14px 0 0;
  border-top: 1px solid var(--line-soft);
  display: block;
}

.page-about .about-rail .side-index__list {
  display: grid;
  gap: 4px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail .side-index__link {
  display: block;
  font-size: 13px;
  line-height: 1.55;
  color: var(--silver-400);
  padding: 6px 4px 6px 10px;
  border-left: 2px solid transparent;
  transition: color 180ms var(--ease-crisp), border-color 180ms var(--ease-crisp);
}

.page-about .about-rail .side-index__link:hover {
  color: var(--silver-100);
}

.page-about .about-rail .side-index__link.is-active,
.page-about .about-rail .side-index__link[aria-current="true"] {
  color: var(--gold-300);
  border-left-color: var(--gold-500);
}

.page-about .about-rail__home {
  justify-self: start;
  margin-top: 8px;
  font-size: 13px;
  min-height: 40px;
  padding-inline: 16px;
}

/* ---------- 首屏 ---------- */

.page-about .about-flow {
  min-width: 0;
  display: grid;
  gap: clamp(36px, 5vw, 68px);
}

.page-about .about-hero {
  display: grid;
  gap: 16px;
  padding-bottom: clamp(24px, 4vw, 40px);
  border-bottom: 1px solid var(--line-gold);
}

.page-about .about-hero__meta {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold-300);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: clamp(30px, 3.6vw, 46px);
  line-height: 1.24;
  letter-spacing: 0.01em;
  color: var(--silver-100);
  max-width: 22ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 42ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--silver-400);
}

.page-about .about-hero__media {
  margin: 8px 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow-deep);
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.85) contrast(1.05) brightness(0.86);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-chapter {
  position: relative;
  display: grid;
  gap: 14px;
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line-gold);
}

.page-about .about-chapter:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-chapter__no {
  margin: 0;
  color: var(--gold-500);
  font-size: 13px;
  letter-spacing: 0.22em;
}

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 600;
  font-size: clamp(22px, 2.5vw, 32px);
  line-height: 1.32;
  letter-spacing: 0.01em;
  color: var(--silver-100);
  max-width: 26ch;
}

.page-about .about-chapter__lede {
  margin: 0;
  max-width: 42ch;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--silver-400);
}

/* ---------- 内嵌等宽数字 ---------- */

.page-about .about-num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.95em;
  letter-spacing: 0.03em;
  color: var(--gold-300);
  padding: 0 2px;
  border-bottom: 1px solid var(--line-gold);
}

/* ---------- 四个常驻入口 ---------- */

.page-about .about-entries {
  display: grid;
  gap: 10px;
  margin-top: 6px;
}

.page-about .about-entries .disclosure {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius-m);
  background: linear-gradient(120deg, rgba(63, 111, 122, 0.16), rgba(7, 26, 43, 0.5));
  overflow: hidden;
  transition: border-color 220ms var(--ease-crisp);
}

.page-about .about-entries .disclosure:hover {
  border-color: var(--line-gold);
}

.page-about .about-entries .disclosure__trigger {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 20px;
  background: transparent;
  border: 0;
  color: var(--silver-100);
  font-family: inherit;
  text-align: left;
  cursor: pointer;
  min-height: 56px;
}

.page-about .about-entries .disclosure__no {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-300);
  padding: 3px 9px;
  border: 1px solid var(--line-gold);
  border-radius: 999px;
}

.page-about .about-entries .disclosure__label {
  font-size: 16.5px;
  letter-spacing: 0.02em;
}

.page-about .about-entries .disclosure__icon {
  position: relative;
  width: 14px;
  height: 14px;
}

.page-about .about-entries .disclosure__icon::before,
.page-about .about-entries .disclosure__icon::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--gold-300);
  transition: transform 220ms var(--ease-crisp), opacity 220ms;
}

.page-about .about-entries .disclosure__icon::before {
  width: 14px;
  height: 1.5px;
  transform: translate(-50%, -50%);
}

.page-about .about-entries .disclosure__icon::after {
  width: 1.5px;
  height: 14px;
  transform: translate(-50%, -50%);
}

.page-about .about-entries .disclosure__trigger[aria-expanded="true"] .disclosure__icon::after {
  transform: translate(-50%, -50%) scaleY(0);
  opacity: 0;
}

.page-about .about-entries .disclosure__inner {
  padding: 0 20px 20px;
}

.page-about .about-entries .disclosure__body {
  border-top: 1px dashed var(--line-soft);
  padding-top: 14px;
}

.page-about .about-entries .disclosure__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--silver-400);
  max-width: 42ch;
}

/* ---------- 团队分工 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-team__body {
  align-self: center;
}

.page-about .about-team__media {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow-deep);
}

.page-about .about-team__media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.9) brightness(0.88);
}

/* ---------- 覆盖示意 ---------- */

.page-about .about-map {
  margin: 12px 0 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow-deep);
}

.page-about .about-map img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.8) brightness(0.78) hue-rotate(-8deg);
}

/* ---------- 联系与备案信息 ---------- */

.page-about .about-contact {
  display: grid;
  gap: 0;
  margin-top: 16px;
  border: 1px solid var(--line-gold);
  border-radius: var(--radius-m);
  background: linear-gradient(160deg, rgba(63, 111, 122, 0.18), rgba(7, 26, 43, 0.55));
  overflow: hidden;
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: minmax(88px, auto) 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 14px 20px;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-contact__row:first-child {
  border-top: 0;
}

.page-about .about-contact__key {
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--gold-300);
}

.page-about .about-contact__val {
  font-size: 15px;
  line-height: 1.65;
  color: var(--silver-100);
  word-break: break-word;
}

.page-about .about-contact__note {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--silver-400);
}

.page-about .about-contact__note a {
  color: var(--gold-300);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-contact__note a:hover {
  color: var(--gold-500);
}

/* ---------- 响应式 ---------- */

@media (min-width: 1025px) {
  .page-about .about-team {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
  }
}

@media (max-width: 1024px) {
  .page-about .about-rail__sticky {
    position: static;
    border-left: 0;
    border-top: 1px solid var(--line-gold);
    border-radius: 0 0 var(--radius-m) var(--radius-m);
    padding: 18px 0 16px;
    background: none;
  }

  .page-about .about-rail .side-index {
    margin-top: 8px;
    padding-top: 12px;
  }

  .page-about .about-contact__row {
    grid-template-columns: minmax(80px, auto) 1fr;
  }
}

@media (max-width: 640px) {
  .page-about .about-hero__title {
    font-size: 30px;
    max-width: none;
  }

  .page-about .about-chapter__title {
    font-size: 22px;
  }

  .page-about .about-contact__row {
    grid-template-columns: 1fr;
    gap: 4px;
    padding: 12px 16px;
  }

  .page-about .about-num {
    font-size: 0.9em;
  }

  .page-about .about-entries .disclosure__trigger {
    padding: 16px 14px;
    gap: 10px;
  }

  .page-about .about-entries .disclosure__inner {
    padding: 0 14px 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-entries .disclosure,
  .page-about .about-entries .disclosure__icon::before,
  .page-about .about-entries .disclosure__icon::after,
  .page-about .about-rail .side-index__link {
    transition: none;
  }
}