.page-about {
  --about-sticky-top: 112px;
  --about-gap: clamp(46px, 5.4vw, 92px);
  background: var(--fog-050);
  color: var(--ink-900);
}

/* ============ 章节封面 ============ */
.page-about .about-cover {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(18px, 2.2vw, 30px) 0 clamp(46px, 6vw, 88px);
  color: var(--fog-050);
  background-color: var(--mineral-700);
  background-image:
    radial-gradient(760px 380px at 6% -18%, rgba(191, 217, 228, .95), rgba(191, 217, 228, 0) 62%),
    radial-gradient(680px 360px at 98% 4%, rgba(232, 118, 58, .32), rgba(232, 118, 58, 0) 64%),
    linear-gradient(156deg, #0E3448 0%, #17516C 54%, #1F6C8D 100%);
  border-bottom-left-radius: clamp(26px, 3.6vw, 56px);
  border-bottom-right-radius: clamp(26px, 3.6vw, 56px);
}

@media (prefers-reduced-motion: no-preference) {
  .page-about .about-cover::after {
    content: "";
    position: absolute;
    inset: -18% -12% -8% -12%;
    z-index: -1;
    pointer-events: none;
    background: radial-gradient(540px 320px at 68% 34%, rgba(168, 123, 60, .26), rgba(168, 123, 60, 0) 70%);
    animation: about-cover-drift 16s ease-in-out infinite alternate;
  }
}

@keyframes about-cover-drift {
  from { transform: translate3d(-2%, -1%, 0) scale(1); }
  to   { transform: translate3d(2%, 2%, 0) scale(1.07); }
}

.page-about .breadcrumb {
  margin: 0 0 clamp(26px, 3.2vw, 46px);
}

.page-about .breadcrumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(245, 247, 248, .68);
}

.page-about .breadcrumb-list li + li::before {
  content: "/";
  margin-right: 10px;
  color: rgba(245, 247, 248, .42);
}

.page-about .breadcrumb-link {
  color: rgba(245, 247, 248, .9);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 247, 248, .32);
  padding-bottom: 1px;
}

.page-about .breadcrumb-link:hover {
  color: var(--copper-100);
  border-bottom-color: var(--copper-100);
}

.page-about .cover-inner {
  display: grid;
  gap: clamp(28px, 3.6vw, 52px);
}

@media (min-width: 900px) {
  .page-about .cover-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }
}

.page-about .cover-eyebrow {
  margin: 0 0 16px;
  font-family: var(--font-sans);
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--copper-100);
}

.page-about .cover-copy h1 {
  margin: 0 0 20px;
  max-width: 11em;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(32px, 5.4vw, 62px);
  line-height: 1.16;
  letter-spacing: -.015em;
  color: var(--fog-050);
}

.page-about .cover-lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: rgba(245, 247, 248, .84);
}

.page-about .cover-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(96px, 1fr));
  gap: 10px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .cover-stat {
  display: grid;
  gap: 3px;
  padding: 15px 14px;
  border-radius: 18px;
  border: 1px solid rgba(191, 217, 228, .34);
  background: rgba(245, 247, 248, .07);
}

.page-about .cover-stat-num {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--fog-050);
}

.page-about .cover-stat-unit {
  font-size: 12px;
  letter-spacing: .06em;
  color: rgba(245, 247, 248, .74);
}

.page-about .cover-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cover .btn-ghost {
  color: var(--fog-050);
  background: transparent;
  border-color: rgba(245, 247, 248, .46);
}

.page-about .about-cover .btn-ghost:hover {
  background: rgba(245, 247, 248, .14);
  border-color: var(--copper-100);
}

/* ============ 两栏骨架 ============ */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 56px);
  padding-block: clamp(44px, 5.5vw, 88px) clamp(56px, 6vw, 100px);
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(40px, 4vw, 72px);
    align-items: start;
  }
}

/* ============ 粘性侧栏 ============ */
.page-about .about-aside {
  display: grid;
  gap: 16px;
  align-content: start;
  padding: clamp(22px, 2.6vw, 32px);
  border-radius: var(--radius-card);
  border: 1px solid rgba(168, 123, 60, .24);
  background: linear-gradient(168deg, var(--copper-100) 0%, var(--fog-100) 60%, var(--fog-050) 100%);
  box-shadow: var(--shadow-soft);
}

@media (min-width: 960px) {
  .page-about .about-aside {
    position: sticky;
    top: var(--about-sticky-top);
    align-self: start;
  }
}

.page-about .aside-kicker {
  margin: 0;
  font-size: 12px;
  letter-spacing: .24em;
  color: var(--warm-700);
}

.page-about .aside-quote {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(20px, 2.1vw, 27px);
  line-height: 1.5;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.page-about .aside-body {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-600);
}

.page-about .aside-facts {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 16px 0 0;
  list-style: none;
  border-top: 1px solid rgba(168, 123, 60, .36);
}

.page-about .aside-facts li {
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .aside-num {
  font-size: 26px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--mineral-700);
}

.page-about .aside-unit {
  font-size: 13px;
  color: var(--ink-600);
}

.page-about .aside-nav {
  padding-top: 14px;
  border-top: 1px dashed rgba(168, 123, 60, .48);
}

.page-about .aside-nav-title {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--ink-600);
}

.page-about .aside-nav-list {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .aside-nav-list a {
  display: inline-block;
  padding: 6px 12px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(18, 63, 85, .16);
  background: rgba(255, 255, 255, .74);
  font-size: 13px;
  color: var(--mineral-700);
  text-decoration: none;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .aside-nav-list a:hover,
.page-about .aside-nav-list a:focus-visible {
  background: var(--mineral-700);
  border-color: var(--mineral-700);
  color: var(--fog-050);
}

/* ============ 右侧叙事流 ============ */
.page-about .about-stream {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-block {
  scroll-margin-top: 120px;
}

.page-about .block-head {
  display: grid;
  gap: 10px;
  margin-bottom: clamp(20px, 2.4vw, 34px);
}

.page-about .block-index {
  font-size: 12px;
  letter-spacing: .3em;
  color: var(--copper-600);
}

.page-about .block-head h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1.24;
  letter-spacing: -.012em;
  color: var(--ink-900);
}

.page-about .block-head p {
  margin: 0;
  max-width: 44em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ink-600);
}

/* ============ 01 三类困扰 ============ */
.page-about .pain-list {
  display: grid;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .pain-item {
  position: relative;
  padding: clamp(20px, 2.4vw, 28px);
  padding-left: clamp(58px, 5vw, 78px);
  border-radius: var(--radius-card);
  border: 1px solid var(--stone-300);
  background: #fff;
  box-shadow: 0 18px 42px -36px rgba(18, 63, 85, .65);
  transition: transform .24s ease, box-shadow .24s ease, border-color .24s ease;
}

.page-about .pain-item:hover {
  transform: translateY(-3px);
  border-color: var(--copper-600);
  box-shadow: 0 26px 54px -34px rgba(18, 63, 85, .55);
}

.page-about .pain-num {
  position: absolute;
  left: clamp(18px, 2.2vw, 26px);
  top: clamp(22px, 2.4vw, 30px);
  font-size: 20px;
  letter-spacing: .06em;
  color: var(--copper-600);
}

.page-about .pain-item h3 {
  margin: 0 0 8px;
  font-size: clamp(17px, 1.7vw, 19px);
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .pain-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-600);
}

.page-about .pain-item .pain-cost {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px dashed var(--stone-300);
}

.page-about .cost-tag {
  display: inline-block;
  margin-right: 8px;
  padding: 2px 10px;
  border-radius: var(--radius-pill);
  background: var(--copper-100);
  color: var(--warm-700);
  font-size: 12px;
  letter-spacing: .06em;
}

/* ============ 02 三类客户 ============ */
.page-about .scene-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 760px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .scene-card {
  display: grid;
  align-content: start;
  gap: 10px;
  padding: clamp(20px, 2.2vw, 26px);
  border-radius: var(--radius-card);
  border: 1px solid transparent;
  background: var(--fog-100);
  transition: background .24s ease, border-color .24s ease, transform .24s ease;
}

.page-about .scene-card:hover {
  background: #fff;
  border-color: var(--mineral-200);
  transform: translateY(-3px);
}

.page-about .scene-tag {
  margin: 0;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mineral-500);
}

.page-about .scene-card h3 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--ink-900);
}

.page-about .scene-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-600);
}

.page-about .scene-link {
  justify-self: start;
  margin-top: 2px;
  padding-bottom: 1px;
  font-size: 13.5px;
  color: var(--warm-700);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.page-about .scene-link:hover {
  color: var(--warm-500);
}

/* ============ 03 团队 ============ */
.page-about .team-list {
  display: grid;
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .team-row {
  display: grid;
  gap: 8px;
}

.page-about .team-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 14px;
}

.page-about .team-role {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .team-count {
  font-size: 13px;
  color: var(--ink-600);
}

.page-about .team-count .num {
  font-size: 18px;
  font-weight: 600;
  color: var(--mineral-700);
}

.page-about .team-bar {
  height: 6px;
  border-radius: var(--radius-pill);
  background: var(--fog-100);
  overflow: hidden;
}

.page-about .team-fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--mineral-700), var(--mineral-500));
}

.page-about .team-row:nth-child(1) .team-fill { width: 32.6%; }
.page-about .team-row:nth-child(2) .team-fill { width: 27.9%; }
.page-about .team-row:nth-child(3) .team-fill { width: 20.9%; }
.page-about .team-row:nth-child(4) .team-fill { width: 18.6%; }

.page-about .team-row p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-600);
}

/* ============ 配图 ============ */
.page-about .about-figure {
  display: grid;
  gap: 10px;
  margin: clamp(24px, 2.8vw, 38px) 0 0;
}

.page-about .about-figure .media-frame {
  border-radius: var(--radius-card);
  overflow: hidden;
}

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

.page-about .about-figure figcaption {
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-600);
}

/* ============ 04 四步方法 ============ */
.page-about .steps {
  position: relative;
  display: grid;
  gap: 18px;
}

.page-about .step-radio {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: 0;
  opacity: 0;
  pointer-events: none;
}

.page-about .step-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .step-tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--stone-300);
  background: #fff;
  font-size: 14px;
  color: var(--ink-600);
  cursor: pointer;
  user-select: none;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}

.page-about .step-tab:hover {
  border-color: var(--copper-600);
  color: var(--ink-900);
}

.page-about .step-dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  border: 1.5px solid var(--copper-600);
  background: transparent;
  transition: background .2s ease, border-color .2s ease;
}

.page-about .step-radio:nth-of-type(1):checked ~ .step-tabs .step-tab:nth-child(1),
.page-about .step-radio:nth-of-type(2):checked ~ .step-tabs .step-tab:nth-child(2),
.page-about .step-radio:nth-of-type(3):checked ~ .step-tabs .step-tab:nth-child(3),
.page-about .step-radio:nth-of-type(4):checked ~ .step-tabs .step-tab:nth-child(4) {
  background: var(--mineral-700);
  border-color: var(--mineral-700);
  color: var(--fog-050);
}

.page-about .step-radio:nth-of-type(1):checked ~ .step-tabs .step-tab:nth-child(1) .step-dot,
.page-about .step-radio:nth-of-type(2):checked ~ .step-tabs .step-tab:nth-child(2) .step-dot,
.page-about .step-radio:nth-of-type(3):checked ~ .step-tabs .step-tab:nth-child(3) .step-dot,
.page-about .step-radio:nth-of-type(4):checked ~ .step-tabs .step-tab:nth-child(4) .step-dot {
  background: var(--warm-500);
  border-color: var(--warm-500);
}

.page-about .step-panels {
  padding: clamp(22px, 2.6vw, 32px);
  border-radius: var(--radius-card);
  border: 1px solid var(--stone-300);
  border-left: 3px solid var(--copper-600);
  background: linear-gradient(180deg, #fff 0%, var(--fog-050) 100%);
}

.page-about .step-panel {
  display: none;
}

.page-about .step-radio:checked ~ .step-panels .step-panel {
  display: none;
}

.page-about .step-radio:nth-of-type(1):checked ~ .step-panels .step-panel:nth-child(1),
.page-about .step-radio:nth-of-type(2):checked ~ .step-panels .step-panel:nth-child(2),
.page-about .step-radio:nth-of-type(3):checked ~ .step-panels .step-panel:nth-child(3),
.page-about .step-radio:nth-of-type(4):checked ~ .step-panels .step-panel:nth-child(4) {
  display: block;
}

.page-about .step-panel > p {
  margin: 0 0 16px;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-600);
}

.page-about .step-meta {
  display: grid;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .step-meta li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 11px 0;
  border-top: 1px dashed var(--stone-300);
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-600);
}

.page-about .meta-k {
  font-size: 12px;
  letter-spacing: .1em;
  white-space: nowrap;
  color: var(--copper-600);
}

@media (max-width: 540px) {
  .page-about .step-meta li {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
}

/* ============ 05 服务半径 ============ */
.page-about .scale-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 700px) {
  .page-about .scale-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

.page-about .scale-card {
  display: grid;
  align-content: start;
  gap: 4px;
  padding: clamp(20px, 2.2vw, 28px);
  border-radius: var(--radius-card);
  background: linear-gradient(168deg, var(--mineral-700) 0%, #16506B 100%);
  color: var(--fog-050);
  transition: transform .24s ease, box-shadow .24s ease;
}

.page-about .scale-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 28px 56px -34px rgba(18, 63, 85, .8);
}

.page-about .scale-num {
  font-size: clamp(30px, 3.6vw, 40px);
  font-weight: 600;
  line-height: 1.1;
  color: var(--fog-050);
}

.page-about .scale-unit {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--copper-100);
}

.page-about .scale-card p {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 247, 248, .8);
}

/* ============ 06 合作与生态 ============ */
.page-about .partner-grid {
  display: grid;
  gap: 12px;
}

@media (min-width: 700px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.page-about .partner-card {
  padding: clamp(20px, 2.2vw, 28px);
  border-radius: var(--radius-card);
  border: 1px solid rgba(168, 123, 60, .3);
  background: var(--copper-100);
}

.page-about .partner-stat {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0 0 10px;
  font-size: 14px;
  color: var(--warm-700);
}

.page-about .partner-stat .num {
  font-size: 32px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--warm-700);
}

.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 600;
  color: var(--ink-900);
}

.page-about .partner-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-600);
}

/* ============ 收尾 ============ */
.page-about .about-cta {
  display: grid;
  gap: 18px;
  padding: clamp(24px, 3vw, 40px);
  border-radius: var(--radius-card);
  border: 1px solid var(--stone-300);
  background: linear-gradient(120deg, var(--fog-100) 0%, var(--copper-100) 100%);
}

.page-about .cta-lead {
  margin: 0;
  max-width: 46em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-600);
}

.page-about .cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-cover::after {
    animation: none;
  }
  .page-about .pain-item,
  .page-about .scene-card,
  .page-about .scale-card {
    transition: none;
  }
}