/* ============================================================
   关于我们模块
   视觉基准：总览图第 14-23 页、板块详情效果图第 41-50 页
   ============================================================ */
:root {
  --about-hero-h: 154px;
  --about-sidebar-w: 184px;
  --about-frame-w: 1360px;
  --about-stage-h: calc(100svh - var(--header-h) - var(--about-hero-h));
  --about-soft-bg: #eef5fa;
  --about-line: #dbe4eb;
  --about-red: #c82127;
  --about-green: #68bd45;
}

.about-page {
  overflow-x: hidden;
  background: #fff;
}

.about-page .site-header {
  border-top: 4px solid var(--brand-blue);
  background: #fff;
  box-shadow: 0 1px 8px rgba(0, 52, 103, .08);
}
.about-page .logo-white { display: none; }
.about-page .logo-color { display: block; }
.about-page .nav-item,
.about-page .lang-switch,
.about-page .icon-btn { color: var(--text-dark); }
.about-page .nav-item::after { background: var(--brand-blue); }
.about-page .nav-item.active { color: var(--brand-blue); }

.about-main { min-width: 0; }
.about-stage { position: relative; }
.about-hero {
  position: relative;
  height: var(--about-hero-h);
  margin-top: var(--header-h);
  overflow: hidden;
  background: #345b78;
}
.about-hero > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 48%;
}
.about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(9, 35, 56, .08);
  pointer-events: none;
}
.about-hero-inner {
  position: absolute;
  z-index: 1;
  inset: 0;
  display: flex;
  align-items: flex-end;
  justify-content: flex-end;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px 13px;
}
.about-breadcrumb {
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  text-shadow: 0 1px 2px rgba(0, 0, 0, .35);
}

/* ===================== 左侧目录 ===================== */
.about-stage,
.about-detail-layout {
  display: grid;
  grid-template-columns: 208px minmax(0, 1fr);
  gap: 0;
  width: min(100%, var(--about-frame-w));
  margin: 0 auto;
  padding: 0 24px;
}
.about-stage { height: auto; }
.about-sidebar {
  position: sticky;
  top: calc(var(--header-h) + 16px);
  z-index: 6;
  align-self: start;
  width: var(--about-sidebar-w);
  margin-top: -34px;
  box-shadow: 0 4px 13px rgba(20, 51, 76, .2);
}
.about-sidebar h1 {
  min-height: 50px;
  padding: 13px 12px 11px;
  background: var(--brand-blue);
  color: #fff;
  font-size: 20px;
  font-weight: 500;
  line-height: 1.3;
  text-align: center;
}
.about-nav { background: #c7cdd1; }
.about-nav-item {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 32px;
  padding: 7px 28px 7px 12px;
  border-top: 1px solid rgba(255, 255, 255, .5);
  background: #bfc4c8;
  color: #fff;
  font-size: 12px;
  line-height: 1.35;
  text-align: center;
  text-shadow: 0 1px 1px rgba(0, 0, 0, .18);
  transition: background .2s ease, color .2s ease;
}
.about-nav-item:hover,
.about-nav-item:focus-visible { background: #9ca8b0; }
.about-nav-item.active {
  background: #0b62b1;
  color: #fff;
  font-weight: 700;
}
.about-nav-separator {
  display: block;
  height: 15px;
  border-top: 1px solid rgba(255, 255, 255, .78);
  background: #eef2f4;
}
.about-nav-external { background: #aeb6bc; }
.about-nav-jump {
  position: absolute;
  right: 9px;
  top: 50%;
  width: 14px;
  height: 14px;
  transform: translateY(-50%);
}
.about-nav-jump svg,
.about-round-arrow svg,
.careers-card h2 svg,
.brochure-entry svg {
  display: block;
  width: 100%;
  height: 100%;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ===================== 六个瀑布流模块 ===================== */
.about-panel-scroller {
  min-width: 0;
  height: auto;
  overflow: visible;
  position: relative;
  z-index: 1;
}
.about-panel {
  height: auto;
  min-height: 0;
  overflow: visible;
  scroll-margin-top: calc(var(--header-h) + 18px);
  background: #fff;
}
.about-panel-inner {
  width: 100%;
  min-height: 100%;
  padding: 44px 42px 52px;
}
.about-heading {
  display: flex;
  justify-content: center;
  margin-bottom: 30px;
  text-align: center;
}
.about-heading h2 {
  position: relative;
  padding-bottom: 12px;
  color: #1f252a;
  font-size: 26px;
  line-height: 1.25;
}
.about-heading h2::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 0;
  width: 40px;
  height: 3px;
  background: var(--brand-blue);
  transform: translateX(-50%);
}
.about-heading-light h2 { color: #fff; }
.about-heading-light h2::after { background: #fff; }
.about-detail-link,
.about-back-link {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  min-height: 34px;
  padding: 7px 17px;
  border: 1px solid var(--brand-blue);
  border-radius: 18px;
  color: var(--brand-blue);
  font-size: 13px;
  font-weight: 600;
  transition: background .2s ease, color .2s ease;
}
.about-detail-link:hover,
.about-back-link:hover { background: var(--brand-blue); color: #fff; }

/* ===================== 企业简介 ===================== */
.about-company-panel .about-panel-inner { padding: 0 0 52px; }
.company-summary {
  display: grid;
  grid-template-columns: minmax(250px, .85fr) minmax(360px, 1.15fr);
  gap: 42px;
  align-items: center;
  padding: 50px 42px 58px;
}
.company-summary-media img {
  width: 100%;
  height: auto;
  max-height: 420px;
  aspect-ratio: auto;
  object-fit: contain;
  object-position: center;
  box-shadow: 12px 14px 0 rgba(8, 62, 105, .14), 0 16px 28px rgba(8, 36, 61, .16);
}
.company-summary-copy .about-heading { justify-content: flex-start; margin-bottom: 22px; text-align: left; }
.company-summary-copy .about-heading h2::after { left: 0; transform: none; }
.company-stats {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 8px;
  margin-bottom: 23px;
}
.company-stats div { min-width: 0; text-align: center; }
.company-stats strong { display: block; color: var(--about-green); font-size: 26px; line-height: 1; }
.company-stats span { display: block; margin-top: 7px; color: #747d84; font-size: 10px; line-height: 1.35; }
.company-summary-copy h3 { margin-bottom: 13px; color: #24292d; font-size: 18px; }
.company-summary-copy > p { margin-bottom: 20px; color: #616a71; font-size: 13px; line-height: 1.9; }

.founder-band {
  position: relative;
  display: block;
  padding: 50px 48px 58px;
  background: #0759a4;
  box-shadow: 0 0 0 100vmax #0759a4;
  clip-path: inset(0 -100vmax);
  color: #fff;
}
.founder-heading { margin: 0 auto 30px; text-align: center; }
.founder-heading h2 { font-size: 30px; line-height: 1.2; }
.founder-heading p { margin-top: 8px; color: #d9ecff; font-size: 16px; line-height: 1.3; }
.founder-profile {
  display: grid;
  grid-template-columns: 180px minmax(230px, 260px);
  gap: 28px;
  align-items: center;
  justify-content: center;
  max-width: 620px;
  margin: 0 auto 42px;
}
.founder-profile img { width: 180px; max-height: 270px; object-fit: contain; object-position: bottom; }
.founder-profile strong { display: block; margin-bottom: 12px; color: #fff; }
.founder-nameplate .founder-name { font-size: 21px; font-weight: 700; }
.founder-nameplate .founder-role { font-size: 16px; font-weight: 600; }
.founder-profile p,
.founder-copy p { font-size: 13px; line-height: 1.9; }
.founder-copy { max-width: 1040px; margin: 0 auto; columns: 2; column-gap: 48px; }
.founder-copy p { margin-bottom: 13px; break-inside: avoid; }

.history-preview { padding: 52px 42px 58px; text-align: center; }
.history-year-rail {
  display: grid;
  grid-template-columns: repeat(9, minmax(0, 1fr));
  max-width: 790px;
  margin: 0 auto 28px;
  list-style: none;
  border-bottom: 1px solid #ccd5dc;
}
.history-year-rail li { position: relative; padding-bottom: 17px; color: #747d84; font-size: 12px; }
.history-year-rail button {
  position: relative;
  z-index: 1;
  padding: 0 4px;
  color: inherit;
  font: inherit;
  cursor: pointer;
}
.history-year-rail button:focus-visible { outline: 2px solid var(--brand-blue); outline-offset: 4px; }
.history-year-rail li::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -5px;
  width: 9px;
  height: 9px;
  border: 2px solid #fff;
  border-radius: 50%;
  background: #b9c3ca;
  box-shadow: 0 0 0 1px #b9c3ca;
  transform: translateX(-50%);
}
.history-year-rail li.active { color: var(--about-green); font-weight: 700; }
.history-year-rail li.active::after { background: var(--about-green); box-shadow: 0 0 0 1px var(--about-green); }
.history-preview > p { max-width: 660px; min-height: 47px; margin: 0 auto 18px; color: #59636b; font-size: 13px; line-height: 1.8; }

.culture-band,
.team-gallery-section {
  position: relative;
}
.culture-band {
  padding: 52px 42px 58px;
  background: #0759a4;
  box-shadow: 0 0 0 100vmax #0759a4;
  clip-path: inset(0 -100vmax);
}
.culture-grid { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 24px; }
.culture-grid article {
  min-height: 134px;
  padding: 27px 18px 20px;
  border-radius: 6px;
  background: #fff;
  text-align: center;
}
.culture-grid strong { color: var(--brand-blue); font-size: 18px; }
.culture-grid p { margin-top: 13px; color: #4f5b64; font-size: 12px; line-height: 1.7; }

.organization-section { padding: 52px 42px 58px; text-align: center; }
.organization-section > p { max-width: 850px; margin: 0 auto 28px; color: #5c666e; font-size: 13px; line-height: 1.9; text-align: left; }
.organization-section > img { width: min(100%, 780px); margin: 0 auto; }

.office-section {
  position: relative;
  padding: 52px 42px 58px;
  background: #0759a4;
  box-shadow: 0 0 0 100vmax #0759a4;
  clip-path: inset(0 -100vmax);
  color: #fff;
}
.office-section .about-heading h2 { color: #fff; }
.office-section .about-heading h2::after { background: #fff; }
.office-tabs { display: flex; justify-content: center; gap: 14px; margin-bottom: 24px; }
.office-tabs button { min-width: 94px; padding: 7px 13px; border-bottom: 2px solid transparent; color: #d9ecff; font-size: 13px; }
.office-tabs button.active { border-color: #fff; color: #fff; font-weight: 700; }
.office-gallery { position: relative; max-width: 1000px; margin: 0 auto; padding: 0 76px; }
.office-gallery > img { display: block; width: 100%; height: auto; object-fit: contain; }
.office-gallery > .about-round-arrow { position: absolute; top: 50%; z-index: 3; transform: translateY(-50%); }
.office-gallery > .about-round-arrow:first-child { left: 8px; background: #8eb4d8; }
.office-gallery > .about-round-arrow:last-child { right: 8px; }
.office-panels,
.office-cards { display: grid; grid-template-columns: minmax(92px, 150px) minmax(0, 1fr) minmax(92px, 150px); gap: 14px; align-items: center; }
.office-card { min-width: 0; aspect-ratio: 1.72 / 1; overflow: hidden; border: 0; background: #edf3f8; box-shadow: 0 8px 18px rgba(0, 45, 90, .12); }
.office-card img { display: block; width: 100%; height: 100%; object-fit: contain; }
.office-card:not(.office-card--active) { opacity: .62; cursor: pointer; transform: scale(.86); transition: opacity .2s ease, transform .2s ease; }
.office-card:not(.office-card--active):hover,
.office-card:not(.office-card--active):focus-visible { opacity: .9; transform: scale(.9); }
.office-card--active { z-index: 2; box-shadow: 0 12px 28px rgba(0, 38, 79, .22); }

/* ===================== 团队实力 ===================== */
.about-team-panel .about-panel-inner { padding-bottom: 0; }
.core-team { display: grid; grid-template-columns: minmax(180px, 280px) minmax(320px, 1fr); gap: 50px; align-items: center; min-height: 360px; max-width: 780px; margin: 0 auto; }
.core-team-photo { width: 100%; height: 270px; object-fit: contain; object-position: bottom; }
.core-team-copy { min-height: 220px; }
.core-team-copy h3 { color: #1f252a; font-size: 25px; }
.core-team-copy span { display: block; margin: 4px 0 18px; color: var(--brand-blue); font-size: 14px; }
.core-team-copy p { min-height: 100px; color: #5a646c; font-size: 13px; line-height: 1.9; white-space: pre-line; }
.team-portraits { display: flex; justify-content: center; gap: 18px; margin: 24px 0 34px; }
.team-portraits button {
  width: 48px;
  height: 48px;
  overflow: hidden;
  border: 2px solid #8f9aa3;
  border-radius: 50%;
  opacity: .82;
  cursor: pointer;
}
.team-portraits button:disabled { cursor: not-allowed; }
.team-portraits button[aria-pressed="true"] { border-color: var(--about-green); opacity: 1; }
.team-portraits button.active { border-color: var(--about-green); opacity: 1; }
.team-portraits img { width: 100%; height: 100%; object-fit: cover; }
.team-gallery-section {
  margin: 0;
  padding: 42px 42px 46px;
  background: #0759a4;
  box-shadow: 0 0 0 100vmax #0759a4;
  clip-path: inset(0 -100vmax);
}
.team-gallery { position: relative; width: min(100%, 760px); aspect-ratio: 1.88 / 1; margin: 0 auto; overflow: hidden; }
.team-gallery img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: contain; opacity: 0; transition: opacity .25s ease; }
.team-gallery img.active { opacity: 1; }
.team-gallery-controls { display: flex; justify-content: center; gap: 12px; margin-top: 17px; }
.about-join-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 58px;
  position: relative;
  padding: 12px 42px;
  background: #f1f5f8;
  box-shadow: 0 0 0 100vmax #f1f5f8;
  clip-path: inset(0 -100vmax);
  color: #34414a;
  font-size: 15px;
}
.about-join-link span { padding: 7px 18px; border-radius: 17px; background: var(--about-green); color: #fff; font-size: 12px; }

/* ===================== 党的建设 ===================== */
.about-party-panel .about-panel-inner { background: #fff; }
.party-layout { display: grid; grid-template-columns: .55fr 1fr 1fr; grid-template-rows: 1fr 1fr; gap: 15px; max-width: 830px; margin: 0 auto; }
.party-title-mark { grid-row: 1 / 3; position: relative; min-height: 360px; overflow: hidden; }
.party-title-mark img { width: 100%; height: 100%; object-fit: contain; }
.party-title-mark h2 { position: absolute; top: 45px; right: 9px; width: 1em; color: #111; font-size: 28px; line-height: 1.25; }
.party-layout > img { width: 100%; height: auto; min-height: 0; object-fit: contain; align-self: start; }
.party-layout > img:nth-of-type(1) { grid-column: 2 / 4; }
.party-copy { max-width: 830px; margin: 30px auto 0; padding: 26px 30px; border-top: 3px solid var(--about-red); background: #f8f3f1; }
.party-copy h3 { color: var(--about-red); font-size: 20px; }
.party-copy > p { margin: 6px 0 15px; color: #5c6062; font-size: 13px; }
.party-copy ul { display: grid; grid-template-columns: 1fr 1fr; gap: 7px 30px; padding-left: 18px; color: #4e555a; font-size: 12px; line-height: 1.6; }

/* ===================== 指导合作、员工风采 ===================== */
.about-cooperation-panel .about-panel-inner { display: flex; flex-direction: column; justify-content: center; }
.cooperation-image { display: block; width: 100%; max-width: none; margin: 0 auto; }

.staff-activity-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.68fr) minmax(0, 1fr);
  gap: 22px;
  width: 100%;
  margin: 0 auto;
  align-items: start;
}
.staff-activity-group {
  min-width: 0;
  margin: 0;
  padding: 5px;
  border: 1px solid #e5edf3;
  background: #f8fbfd;
  box-shadow: 0 8px 18px rgba(28, 63, 87, .08);
}
.staff-activity-group img { display: block; width: 100%; height: auto; object-fit: contain; }
.staff-annual-section {
  margin-top: 32px;
  padding-top: 28px;
  border-top: 1px solid #e5edf3;
}
.staff-annual-gallery {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr)) minmax(72px, .62fr);
  gap: 10px;
  width: 100%;
  margin: 0 auto;
  align-items: stretch;
}
.staff-event-card {
  min-width: 0;
  height: 148px;
  margin: 0;
  overflow: hidden;
  border: 1px solid #e4ebf0;
  background: #f4f7f9;
  box-shadow: 0 5px 12px rgba(30, 62, 83, .09);
}
.staff-event-card img { display: block; width: 100%; height: 100%; object-fit: cover; }
.staff-program-card { display: flex; align-items: stretch; justify-content: center; background: #eef3f7; }
.staff-program-card img { width: 100%; height: 100%; object-fit: contain; }

/* ===================== 品牌视听 ===================== */
.about-media-panel { background: #f4f4f4; }
.about-media-panel .about-panel-inner { display: flex; flex-direction: column; justify-content: center; }
.media-layout { display: grid; grid-template-columns: minmax(360px, 1.15fr) minmax(250px, .85fr); gap: 36px; align-items: center; max-width: 850px; margin: 0 auto; }
.brand-video { width: 100%; aspect-ratio: 16 / 9; background: #111; box-shadow: 0 7px 24px rgba(0, 0, 0, .22); }
.brochure-entry { position: relative; display: block; max-width: 320px; margin: 0 auto; box-shadow: 0 7px 24px rgba(0, 0, 0, .16); }
.brochure-entry img { width: 100%; }
.brochure-entry span {
  position: absolute;
  left: 50%;
  bottom: 18px;
  display: flex;
  align-items: center;
  gap: 8px;
  min-width: 146px;
  padding: 9px 18px;
  border-radius: 20px;
  background: #fff;
  color: var(--brand-blue);
  font-size: 13px;
  font-weight: 700;
  transform: translateX(-50%);
}
.brochure-entry svg { width: 18px; height: 18px; fill: var(--brand-blue); stroke: none; }

.about-round-arrow {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  flex: 0 0 34px;
  border-radius: 50%;
  background: var(--brand-blue);
  color: #fff;
  box-shadow: 0 3px 8px rgba(0, 50, 103, .22);
}
.about-round-arrow svg { width: 19px; height: 19px; }
.about-round-arrow:disabled { cursor: not-allowed; opacity: .42; }
.about-snap-footer { min-height: 330px; }

/* ===================== 独立详情页面 ===================== */
.about-detail-page { background: var(--about-soft-bg); }
.about-detail-layout {
  min-height: 540px;
  align-items: start;
  padding-bottom: 58px;
}
.about-detail-layout > :not(.about-sidebar) { margin-top: 20px; }
.about-detail-card,
.careers-card {
  width: 100%;
  margin-right: auto;
  padding: 44px 48px;
  border-radius: 6px;
  background: #fff;
  box-shadow: 0 5px 18px rgba(49, 82, 105, .12);
}
.profile-detail-card h2 { margin-bottom: 27px; color: #252b2f; font-size: 22px; text-align: center; }
.profile-detail-card p { margin: 20px 0; color: #505b63; font-size: 13px; line-height: 2; text-align: justify; }
.profile-detail-card > img { width: min(100%, 420px); max-height: 270px; margin: 22px auto; object-fit: contain; }
.profile-detail-card > img:last-of-type { max-height: 240px; }
.profile-detail-card .about-back-link,
.history-detail-card .about-back-link { margin-top: 16px; }

.history-detail-card { padding: 43px 46px 50px; }
.history-timeline { position: relative; display: grid; grid-template-columns: 1fr 1fr; gap: 0 50px; list-style: none; }
.history-timeline::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 50%;
  width: 1px;
  background: #d6dde2;
}
.history-timeline li { position: relative; min-height: 105px; padding: 0 0 28px 30px; }
.history-timeline li:nth-child(even) { margin-top: 52px; }
.history-timeline li::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 7px;
  width: 10px;
  height: 10px;
  border: 2px solid var(--about-red);
  border-radius: 50%;
  background: #fff;
}
.history-timeline li:nth-child(odd)::before { left: auto; right: -30px; }
/* 两列之间有 50px 间距，右列节点需左移半个间距并扣除节点半径才能落在中线上。 */
.history-timeline li:nth-child(even)::before { left: -32px; }
.history-timeline time { color: var(--about-red); font-size: 18px; font-weight: 700; }
.history-timeline p { margin-top: 7px; color: #566169; font-size: 12px; line-height: 1.7; }

.brochure-page .about-detail-layout { min-height: 480px; }
.brochure-viewer {
  display: grid;
  grid-template-columns: 38px minmax(0, 650px) 38px;
  gap: 20px;
  align-items: center;
  justify-content: start;
  width: 100%;
  min-width: 0;
  padding: 20px 0 30px;
}
.brochure-viewer figure { min-width: 0; box-shadow: 0 7px 20px rgba(25, 59, 84, .2); }
.brochure-viewer figure img { width: 100%; }
.brochure-viewer .about-back-link { grid-column: 2; justify-self: center; }

/* ===================== 招贤纳士 ===================== */
.careers-card { width: 100%; padding: 34px 36px 40px; }
.careers-card h2 { display: flex; align-items: center; gap: 10px; margin-bottom: 20px; color: #3f4b53; font-size: 19px; }
.careers-card h2 svg { width: 22px; height: 22px; color: var(--about-green); stroke-width: 2.4; }
.career-filters { margin-bottom: 24px; padding-bottom: 18px; border-bottom: 1px solid #dce3e8; }
.career-filter-row { display: flex; flex-wrap: wrap; align-items: baseline; gap: 7px 15px; margin: 8px 0; color: #4e5860; font-size: 12px; }
.career-filter-row strong { width: 74px; flex: 0 0 74px; color: #2f383e; }
.career-filter-row button { padding: 3px 6px; border-radius: 3px; color: #59646c; font-size: 12px; }
.career-filter-row button:hover,
.career-filter-row button:focus-visible { color: var(--brand-blue); }
.career-filter-row button.active { background: var(--brand-blue); color: #fff; }
.career-filter-presentation button:not(.active) { cursor: default; }
.careers-table-scroll { width: 100%; overflow-x: auto; }
.careers-table { width: 100%; min-width: 720px; border-collapse: collapse; color: #454f56; font-size: 12px; }
.careers-table th,
.careers-table td { padding: 10px 12px; border-bottom: 1px solid #e2e7eb; text-align: left; }
.careers-table th { background: #f3f7f9; color: #263139; font-weight: 700; }
.careers-table th:nth-child(3),
.careers-table td:nth-child(3) { text-align: center; }
.careers-table td:first-child { color: #1f2b34; font-weight: 600; }
.careers-table-empty td { padding: 44px 12px; color: #7b868e; text-align: center !important; }

/* ===================== 焦点与无障碍 ===================== */
.about-page a:focus-visible,
.about-page button:focus-visible,
.about-panel-scroller:focus-visible,
.about-page video:focus-visible {
  outline: 3px solid #7cc7ff;
  outline-offset: 3px;
}
.visually-hidden {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (max-width: 1024px) {
  :root { --about-sidebar-w: 160px; }
  .about-stage,
  .about-detail-layout { grid-template-columns: 180px minmax(0, 1fr); gap: 20px; }
  .about-panel-scroller { width: auto; margin-left: 0; padding-left: 0; }
  .about-panel-inner { padding: 38px 28px 46px; }
  .company-summary { grid-template-columns: .8fr 1.2fr; gap: 26px; padding: 42px 28px 48px; }
  .founder-band { padding: 46px 28px 52px; }
  .founder-copy { columns: 2; column-gap: 28px; }
  .culture-grid { gap: 13px; }
  .culture-band,
  .history-preview,
  .organization-section,
  .office-section { padding-left: 28px; padding-right: 28px; }
  .team-gallery-section,
  .about-join-link { margin-left: 0; margin-right: 0; }
  .about-detail-card,
  .careers-card { padding-left: 34px; padding-right: 34px; }
}

@media (max-width: 768px) {
  :root { --about-hero-h: 128px; --about-sidebar-w: 100%; }
  .about-page .site-header { border-top-width: 3px; }
  .about-hero-inner { padding-bottom: 9px; }
  .about-breadcrumb { font-size: 10px; }
  .about-stage,
  .about-detail-layout { display: block; width: 100%; height: auto; padding: 0 18px; }
  .about-sidebar { width: 100%; margin-top: -24px; margin-bottom: 18px; }
  .about-sidebar h1 { min-height: 44px; padding: 10px; font-size: 18px; }
  .about-nav { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .about-nav-item { min-height: 39px; padding: 7px 28px 7px 10px; }
  .about-nav-separator { grid-column: 1 / -1; height: 12px; }
  .about-panel-scroller {
    width: auto;
    margin-left: 0;
    padding-left: 0;
    height: auto;
    overflow: visible;
  }
  .about-panel { height: auto; min-height: 0; overflow: visible; }
  .about-panel-inner { padding: 38px 18px 46px; }
  .about-heading { margin-bottom: 24px; }
  .about-heading h2 { font-size: 23px; }
  .about-company-panel .about-panel-inner { padding-bottom: 42px; }
  .company-summary { display: block; padding: 36px 18px 44px; }
  .company-summary-media { margin-bottom: 28px; }
  .company-summary-copy .about-heading { justify-content: center; text-align: center; }
  .company-summary-copy .about-heading h2::after { left: 50%; transform: translateX(-50%); }
  .company-stats { gap: 5px; }
  .company-stats strong { font-size: 21px; }
  .company-stats span { font-size: 9px; }
  .company-summary-copy > p { font-size: 14px; }
  .founder-band { padding: 42px 18px 46px; }
  .founder-heading { margin-bottom: 26px; }
  .founder-heading h2 { font-size: 25px; }
  .founder-heading p { font-size: 14px; }
  .founder-profile { grid-template-columns: 120px minmax(0, 250px); gap: 18px; margin-bottom: 30px; }
  .founder-profile img { width: 120px; }
  .founder-copy { columns: 1; }
  .founder-profile p,
  .founder-copy p { font-size: 14px; line-height: 1.8; }
  .history-preview,
  .culture-band,
  .organization-section,
  .office-section { padding: 40px 18px 46px; }
  .history-year-rail { overflow-x: auto; grid-template-columns: repeat(9, 66px); padding-bottom: 2px; }
  .culture-grid { grid-template-columns: 1fr 1fr; }
  .culture-grid article { min-height: 145px; }
  .organization-section > p { font-size: 14px; }
  .office-tabs { gap: 3px; }
  .office-tabs button { min-width: 0; flex: 1; }
  .office-gallery { padding: 0 38px; }
  .office-panels,
  .office-cards { grid-template-columns: 74px minmax(0, 1fr) 74px; gap: 6px; }
  .office-gallery > .about-round-arrow:first-child { left: 0; }
  .office-gallery > .about-round-arrow:last-child { right: 0; }
  .core-team { grid-template-columns: 120px minmax(0, 1fr); gap: 18px; }
  .core-team-copy p { font-size: 14px; }
  .team-portraits { gap: 8px; overflow-x: auto; justify-content: flex-start; padding-bottom: 6px; }
  .team-portraits button { width: 44px; height: 44px; flex: 0 0 44px; }
  .team-gallery-section { margin: 0; padding: 38px 18px; }
  .about-join-link { margin-left: 0; padding: 12px 18px; gap: 12px; font-size: 13px; }
  .party-layout { grid-template-columns: 100px 1fr; grid-template-rows: auto auto; }
  .party-title-mark { grid-row: 1 / 3; min-height: 300px; }
  .party-title-mark h2 { top: 30px; right: 0; font-size: 22px; }
  .party-layout > img:nth-of-type(1) { grid-column: 2; }
  .party-layout > img { min-height: 0; }
  .party-copy { padding: 22px 18px; }
  .party-copy ul { grid-template-columns: 1fr; }
  .cooperation-copy { grid-template-columns: 1fr; }
  .staff-activity-layout { grid-template-columns: 1fr; gap: 16px; }
  .staff-activity-group { padding: 4px; }
  .staff-annual-section { margin-top: 26px; padding-top: 22px; }
  .staff-annual-gallery { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .staff-event-card { height: 112px; }
  .staff-program-card { grid-column: 2; grid-row: span 2; height: 232px; }
  .media-layout { grid-template-columns: 1fr; }
  .brochure-entry { width: min(78%, 300px); }
  .about-snap-footer { min-height: 0; }

  .about-detail-layout { padding-bottom: 45px; }
  .about-detail-layout > :not(.about-sidebar) { margin-top: 0; }
  .about-detail-card,
  .careers-card { width: 100%; padding: 30px 20px 36px; }
  .profile-detail-card h2 { font-size: 20px; }
  .profile-detail-card p { font-size: 14px; line-height: 1.85; }
  .history-timeline { display: block; padding-left: 13px; }
  .history-timeline::before { left: 17px; }
  .history-timeline li,
  .history-timeline li:nth-child(even) { min-height: 0; margin: 0; padding: 0 0 28px 34px; }
  .history-timeline li::before,
  .history-timeline li:nth-child(odd)::before,
  .history-timeline li:nth-child(even)::before { left: 0; right: auto; }
  .history-timeline p { font-size: 14px; }
  .brochure-viewer { grid-template-columns: 32px minmax(560px, 1fr) 32px; width: max-content; min-width: 100%; padding-right: 18px; }
  .brochure-page .about-detail-layout { overflow-x: auto; }
  .brochure-viewer .about-back-link { position: sticky; left: 50%; }
  .careers-card { overflow: hidden; }
  .career-filter-row { gap: 8px 10px; font-size: 13px; }
  .career-filter-row strong { width: 100%; flex-basis: 100%; }
  .career-filter-row button { font-size: 13px; }
  .about-nav-item { font-size: 12px; }
  .about-breadcrumb { font-size: 11px; }
}

@media (max-width: 480px) {
  .about-sidebar { position: relative; top: auto; }
}

@media (prefers-reduced-motion: reduce) {
  .about-panel-scroller { scroll-behavior: auto; }
  .about-nav-item,
  .about-detail-link,
  .about-back-link,
  .team-gallery img { transition: none; }
}

/* 桌面宽版布局：目录左移，内容模块横向加宽 */
@media (min-width: 769px) {
  :root { --about-frame-w: 1360px; }
}

/* 桌面端目录标题统一：固定高度，避免不同栏目标题上下不齐 */
@media (min-width: 769px) {
  .about-sidebar h1 {
    height: 50px;
    box-sizing: border-box;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 50px;
    padding: 0 10px;
    line-height: 1.2;
  }
}

/* 桌面端横幅统一 300px，移动端仍使用独立高度适配 */
@media (min-width: 769px) {
  .about-hero {
    width: 100%;
    height: 300px;
    aspect-ratio: auto;
  }
  .about-hero > img { object-fit: cover; object-position: center center; }
}

/* 内页统一版心：目录列与内容列共享同一条中心线 */
@media (min-width: 769px) {
  .about-stage,
  .about-detail-layout {
    grid-template-columns: var(--inner-rail-w) minmax(0, 1fr);
    width: min(100%, var(--inner-frame-w));
    max-width: none;
    padding: 0 var(--inner-frame-pad);
    box-sizing: border-box;
  }
  .about-panel-scroller { min-width: 0; }
  .about-nav-item { font-size: 13px; }
  .about-breadcrumb { font-size: 12px; }
  .company-stats span { font-size: 12px; }
}

/* 桌面宣传册阅读器：双页与箭头相对页面中轴居中，抵消左侧目录轨道偏移 */
@media (min-width: 1025px) {
  .brochure-viewer {
    justify-content: center;
    transform: translateX(calc(-1 * var(--inner-rail-w) / 2));
  }
}

/* 中等桌面仍保留目录与内容间距，位移同步计入该间距 */
@media (min-width: 769px) and (max-width: 1024px) {
  .brochure-viewer {
    justify-content: center;
    transform: translateX(calc(-1 * (var(--inner-rail-w) + 20px) / 2));
  }
}