/* ===== 价值主张 / page-about ===== */

.page-about {
  --about-line: rgba(18, 118, 168, .26);
  --about-line-soft: rgba(18, 118, 168, .12);
  --about-warm-line: rgba(255, 181, 61, .5);
  display: block;
  background: var(--paper);
  color: var(--plateau-ink);
}

.page-about a {
  color: var(--lake-blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about a:hover {
  color: var(--lake-glow);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(2.5rem, 8vw, 5.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(120% 95% at 82% 4%, rgba(47, 184, 224, .30), transparent 58%),
    radial-gradient(95% 85% at 4% 98%, rgba(124, 90, 209, .34), transparent 62%),
    linear-gradient(168deg, var(--lake-deep) 0%, var(--plateau-ink) 68%);
  color: var(--ice-white);
  border-bottom: var(--bw) solid var(--lake-blue);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -6%;
  top: 14%;
  width: 46%;
  height: 62%;
  background: linear-gradient(138deg, rgba(47, 184, 224, .22), rgba(124, 90, 209, 0) 70%);
  transform: skewY(-6deg);
  pointer-events: none;
}

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

.page-about .about-crumbs {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

.page-about .about-crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .45rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crumbs li {
  display: flex;
  align-items: center;
  gap: .45rem;
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  letter-spacing: .06em;
  color: rgba(245, 250, 255, .66);
}

.page-about .about-crumbs li + li::before {
  content: "/";
  color: rgba(245, 250, 255, .34);
}

.page-about .about-crumbs a {
  color: var(--lake-glow);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .about-crumbs a:hover {
  border-bottom-color: currentColor;
}

.page-about .about-eyebrow {
  color: var(--amber-signal);
  margin: 0 0 .9rem;
}

.page-about .about-title {
  margin: 0 0 clamp(1rem, 2.5vw, 1.6rem);
  font-family: var(--font-display);
  font-size: var(--fs-hero);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: .08em;
  color: var(--ice-white);
  text-wrap: balance;
}

.page-about .about-lede {
  max-width: 58ch;
  margin: 0;
  color: rgba(245, 250, 255, .84);
  line-height: 1.85;
}

.page-about .about-hero-facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  margin: clamp(2rem, 5vw, 3rem) 0 0;
  padding: 0;
  list-style: none;
  border: var(--bw) solid rgba(207, 227, 240, .28);
  background: rgba(245, 250, 255, .04);
}

.page-about .about-hero-facts li {
  display: flex;
  flex-direction: column;
  gap: .3rem;
  padding: .9rem 1rem 1rem;
  border-right: 1px solid rgba(207, 227, 240, .16);
  border-bottom: 1px solid rgba(207, 227, 240, .16);
}

.page-about .about-hero-facts li:nth-child(2n) {
  border-right: 0;
}

.page-about .about-hero-facts li:nth-last-child(-n+2) {
  border-bottom: 0;
}

.page-about .about-fact-num {
  font-size: var(--fs-lg);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--lake-glow);
  line-height: 1.1;
}

.page-about .about-fact-label {
  font-size: var(--fs-2xs);
  letter-spacing: .02em;
  color: rgba(245, 250, 255, .72);
}

/* ---------- 通用章节 ---------- */

.page-about .about-sec {
  position: relative;
  padding: clamp(3rem, 7vw, 5.5rem) 0;
}

.page-about .about-sec--plain {
  background: var(--paper);
}

.page-about .about-sec--mist {
  background: var(--paper-dim);
}

.page-about .about-sec--ink {
  background:
    radial-gradient(100% 80% at 88% 0%, rgba(59, 42, 99, .55), transparent 62%),
    linear-gradient(172deg, var(--lake-deep), var(--plateau-ink) 72%);
  color: var(--ice-white);
  border-top: var(--bw) solid var(--lake-blue);
  border-bottom: var(--bw) solid var(--lake-blue);
}

.page-about .about-sec--ink::before {
  content: "";
  position: absolute;
  top: calc(-1 * var(--bw));
  left: 0;
  right: 0;
  height: clamp(26px, 4.5vw, 58px);
  background: var(--paper);
  clip-path: polygon(0 0, 100% 0, 100% 0, 0 100%);
  pointer-events: none;
}

.page-about .about-sec-head {
  max-width: 64ch;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}

.page-about .about-sec-head h2 {
  margin: .55rem 0 0;
}

.page-about .about-sec-sub {
  margin: 1rem 0 0;
  color: var(--text-soft);
  line-height: 1.85;
}

.page-about .about-sec-head--ink .about-sec-sub {
  color: rgba(245, 250, 255, .78);
}

.page-about .about-eyebrow--ink {
  color: var(--amber-signal);
}

/* ---------- 观赛卡点轨道 ---------- */

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

.page-about .about-rail-item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 0 1rem;
  padding-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

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

.page-about .about-rail-marker {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: .4rem;
}

.page-about .about-rail-dot {
  position: relative;
  z-index: 1;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--amber-signal);
  border: var(--bw) solid var(--plateau-ink);
  box-shadow: 0 0 0 4px rgba(255, 181, 61, .22);
}

.page-about .about-rail-item:not(:last-child) .about-rail-marker::after {
  content: "";
  position: absolute;
  top: 1.6rem;
  bottom: -1.6rem;
  left: 50%;
  width: 2px;
  transform: translateX(-50%);
  background: linear-gradient(180deg, rgba(18, 118, 168, .7), rgba(18, 118, 168, .1));
}

.page-about .about-rail-title {
  margin: 0 0 .55rem;
  font-family: var(--font-display);
  font-size: var(--fs-xl);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: .01em;
  color: var(--plateau-ink);
}

.page-about .about-rail-body p {
  margin: 0 0 .7rem;
  color: var(--text-soft);
  line-height: 1.85;
}

.page-about .about-rail-fix {
  padding: .85rem 1rem;
  margin: 0 !important;
  background: var(--ice-white);
  border-left: 4px solid var(--lake-blue);
  color: var(--plateau-ink) !important;
  font-size: var(--fs-xs);
}

.page-about .about-fix-key {
  display: inline-block;
  margin-right: .5rem;
  padding: .1rem .45rem;
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  letter-spacing: .04em;
  color: var(--plateau-ink);
  background: var(--amber-signal);
}

/* ---------- 栏目体系 ---------- */

.page-about .about-system {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-acc .acc-trigger {
  border: var(--bw) solid var(--plateau-ink);
  background: var(--paper);
}

.page-about .about-acc .acc-item + .acc-item {
  margin-top: .75rem;
}

.page-about .about-acc-label {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .about-acc-num {
  font-size: var(--fs-md);
  font-weight: 700;
  color: var(--lake-blue);
}

.page-about .about-column-list {
  display: grid;
  grid-template-columns: repeat(1, minmax(0, 1fr));
  gap: 0;
  margin: 1.1rem 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-column-list li {
  display: flex;
  align-items: baseline;
  gap: .7rem;
  padding: .5rem 0;
  border-bottom: 1px solid var(--about-line-soft);
  font-size: var(--fs-xs);
  color: var(--plateau-ink);
}

.page-about .about-column-list .mono {
  min-width: 2.1rem;
  font-size: var(--fs-2xs);
  color: var(--lake-blue);
  letter-spacing: .04em;
}

.page-about .about-acc-note {
  margin: 1.1rem 0 0;
  padding: .75rem .9rem;
  background: var(--paper-dim);
  border-left: 4px solid var(--dusk-orchid);
  font-size: var(--fs-xs);
  color: var(--text-soft);
  line-height: 1.75;
}

.page-about .about-side-title {
  margin: 0 0 .65rem;
  font-family: var(--font-display);
  font-size: var(--fs-lg);
  font-weight: 700;
  line-height: 1.35;
  color: var(--plateau-ink);
}

.page-about .about-system-side > p {
  margin: 0 0 1.25rem;
  color: var(--text-soft);
  line-height: 1.85;
  font-size: var(--fs-xs);
}

.page-about .about-regions {
  display: grid;
  gap: .55rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}

.page-about .about-regions li {
  display: grid;
  grid-template-columns: 3.6rem minmax(0, 1fr);
  align-items: center;
  gap: .75rem;
}

.page-about .about-region-name {
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  letter-spacing: .06em;
  color: var(--plateau-ink);
}

.page-about .about-region-bar {
  display: block;
  height: 14px;
  border: 1px solid var(--plateau-ink);
}

.page-about .about-region-bar--1 { background: var(--dusk-purple); width: 96%; }
.page-about .about-region-bar--2 { background: #4A3580; width: 84%; }
.page-about .about-region-bar--3 { background: var(--dusk-orchid); width: 72%; }
.page-about .about-region-bar--4 { background: #9A81DE; width: 60%; }
.page-about .about-region-bar--5 { background: var(--lake-blue); width: 48%; }

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--bw) solid var(--plateau-ink);
  box-shadow: var(--shadow-hard);
  background: var(--lake-deep);
  object-fit: cover;
}

.page-about .about-figcaption {
  margin-top: .75rem;
  font-family: var(--font-mono);
  font-size: var(--fs-2xs);
  letter-spacing: .03em;
  line-height: 1.7;
  color: var(--text-soft);
}

.page-about .about-figure--wide {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-figure--wide img {
  box-shadow: var(--shadow-glow);
  border-color: var(--lake-blue);
}

.page-about .about-sec--ink .about-figcaption {
  color: rgba(245, 250, 255, .7);
}

/* ---------- 更新节奏 ---------- */

.page-about .about-rhythm {
  display: grid;
  gap: 1px;
  border: var(--bw) solid rgba(207, 227, 240, .3);
  background: rgba(207, 227, 240, .22);
}

.page-about .about-rhythm-item {
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: rgba(10, 27, 38, .55);
}

.page-about .about-rhythm-step {
  margin: 0 0 .5rem;
  color: var(--amber-signal);
}

.page-about .about-rhythm-title {
  margin: 0 0 .6rem;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 700;
  line-height: 1.4;
  color: var(--ice-white);
}

.page-about .about-rhythm-item p:last-child {
  margin: 0;
  color: rgba(245, 250, 255, .78);
  font-size: var(--fs-xs);
  line-height: 1.85;
}

/* ---------- 团队与协作 ---------- */

.page-about .about-team {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-team-text p {
  margin: 0 0 1rem;
  color: var(--text-soft);
  line-height: 1.85;
}

.page-about .about-team-links {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
  margin-top: 1.5rem;
}

.page-about .about-btn-ink.btn--ghost {
  border: var(--bw) solid var(--plateau-ink);
  color: var(--plateau-ink);
  background: transparent;
  text-decoration: none;
}

.page-about .about-btn-ink.btn--ghost:hover {
  background: var(--plateau-ink);
  color: var(--ice-white);
}

.page-about .about-team-cards {
  display: grid;
  gap: 1rem;
}

.page-about .about-stat-card {
  padding: 1.15rem 1.05rem 1.3rem;
  background: var(--ice-white);
  border: var(--bw) solid var(--plateau-ink);
  box-shadow: var(--shadow-hard);
}

.page-about .about-stat-num {
  margin: 0;
  font-size: var(--fs-2xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--lake-blue);
}

.page-about .about-stat-title {
  margin: .6rem 0 .45rem;
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--plateau-ink);
}

.page-about .about-stat-card p:last-child {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 发展历程 ---------- */

.page-about .about-history {
  display: grid;
  gap: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.5rem;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: .5rem;
  bottom: .5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--lake-blue), var(--dusk-purple) 70%, rgba(124, 90, 209, .2));
}

.page-about .about-timeline-item {
  position: relative;
  padding: 0 0 clamp(1.4rem, 3.5vw, 2rem);
  transition: transform 180ms var(--ease);
}

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

.page-about .about-timeline-item::before {
  content: "";
  position: absolute;
  left: -1.5rem;
  top: .55rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--paper);
  border: var(--bw) solid var(--lake-blue);
}

.page-about .about-timeline-item--current::before {
  background: var(--amber-signal);
  border-color: var(--plateau-ink);
  box-shadow: 0 0 0 4px rgba(255, 181, 61, .25);
  animation: about-pulse 2.4s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px rgba(255, 181, 61, .25); }
  50% { box-shadow: 0 0 0 9px rgba(255, 181, 61, .04); }
}

.page-about .about-timeline-year {
  display: inline-block;
  margin-bottom: .45rem;
  padding: .12rem .5rem;
  font-size: var(--fs-2xs);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--plateau-ink);
  background: var(--ice-mist);
  border: 1px solid var(--lake-blue);
}

.page-about .about-timeline-item--current .about-timeline-year {
  background: var(--amber-signal);
  border-color: var(--plateau-ink);
}

.page-about .about-timeline-title {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: var(--fs-md);
  font-weight: 700;
  line-height: 1.4;
  color: var(--plateau-ink);
}

.page-about .about-timeline-body p {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.85;
  color: var(--text-soft);
}

.page-about .about-timeline-item:hover .about-timeline-title {
  color: var(--lake-blue);
}

.page-about .about-figure--square img {
  border-color: var(--dusk-purple);
  box-shadow: var(--shadow-hard);
}

/* ---------- 服务保障 ---------- */

.page-about .about-assure {
  display: grid;
  gap: 1rem;
}

.page-about .about-assure-card {
  padding: 1.25rem 1.1rem 1.4rem;
  background: var(--paper);
  border: var(--bw) solid var(--plateau-ink);
  border-top: 6px solid var(--lake-blue);
  box-shadow: var(--shadow-hard);
}

.page-about .about-assure-card:nth-child(2) {
  border-top-color: var(--dusk-orchid);
}

.page-about .about-assure-card:nth-child(3) {
  border-top-color: var(--frost-teal);
}

.page-about .about-assure-card:nth-child(4) {
  border-top-color: var(--amber-signal);
}

.page-about .about-assure-num {
  margin: 0 0 .7rem;
  font-size: var(--fs-2xl);
  font-weight: 700;
  line-height: 1;
  letter-spacing: .02em;
  color: var(--plateau-ink);
}

.page-about .about-assure-num small {
  font-size: .45em;
  letter-spacing: .04em;
  color: var(--lake-blue);
}

.page-about .about-assure-title {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-size: var(--fs-sm);
  font-weight: 700;
  color: var(--plateau-ink);
}

.page-about .about-assure-card p:last-child {
  margin: 0;
  font-size: var(--fs-xs);
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 与我们同行 ---------- */

.page-about .about-sec--last {
  border-bottom: 0;
}

.page-about .about-acc--ink .acc-trigger {
  border-color: rgba(207, 227, 240, .3);
  background: rgba(10, 27, 38, .5);
  color: var(--ice-white);
}

.page-about .about-acc--ink .about-acc-num {
  color: var(--amber-signal);
}

.page-about .about-acc--ink .acc-body p {
  color: rgba(245, 250, 255, .8);
  line-height: 1.85;
  margin: 0 0 .85rem;
}

.page-about .about-acc--ink .acc-body p:last-child {
  margin-bottom: 0;
}

.page-about .about-actions {
  display: flex;
  flex-wrap: wrap;
  gap: .85rem;
  margin-top: clamp(1.75rem, 4vw, 2.5rem);
}

.page-about .about-cta.btn--signal {
  background: var(--amber-signal);
  border: var(--bw) solid var(--plateau-ink);
  color: var(--plateau-ink);
  text-decoration: none;
  font-weight: 700;
}

.page-about .about-cta.btn--signal:hover {
  background: var(--ice-white);
}

.page-about .about-btn-light.btn--ghost {
  border: var(--bw) solid rgba(207, 227, 240, .55);
  color: var(--ice-white);
  background: transparent;
  text-decoration: none;
}

.page-about .about-btn-light.btn--ghost:hover {
  border-color: var(--lake-glow);
  color: var(--lake-glow);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero-facts li {
    border-right: 1px solid rgba(207, 227, 240, .16);
    border-bottom: 0;
  }

  .page-about .about-hero-facts li:nth-child(2n) {
    border-right: 1px solid rgba(207, 227, 240, .16);
  }

  .page-about .about-hero-facts li:last-child {
    border-right: 0;
  }

  .page-about .about-hero-facts li:nth-last-child(-n+2) {
    border-bottom: 0;
  }

  .page-about .about-column-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 1.75rem;
  }

  .page-about .about-column-list--pair {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-assure {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-timeline {
    padding-left: 2rem;
  }

  .page-about .about-timeline-item::before {
    left: -2rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-system {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-system-side {
    padding-left: 1.5rem;
    border-left: var(--bw) solid var(--about-line);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team-cards {
    margin-top: 2rem;
  }

  .page-about .about-team-cards > :nth-child(even) {
    transform: translateY(14px);
  }

  .page-about .about-history {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-figure--square {
    position: sticky;
    top: calc(var(--topbar-h) + 1.5rem);
  }

  .page-about .about-rhythm {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-assure {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline-item--current::before {
    animation: none;
  }

  .page-about .about-timeline-item {
    transition: none;
  }
}
</final>