/* ============================================================
   ABOUT · 关于我们
   Single light background. Regions are separated by content,
   type hierarchy, hairline rules and the timeline rail —
   never by background color blocks.
   ============================================================ */

:root {
  --ab-bg: #F7F9FC;
  --ab-card: #FFFFFF;
}

/* whole page is one light tone with a faint blueprint grid */
body.about-page {
  background-color: var(--ab-bg);
  background-image:
    linear-gradient(rgba(22,80,168,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22,80,168,.04) 1px, transparent 1px),
    linear-gradient(rgba(30,160,151,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(30,160,151,.05) 1px, transparent 1px);
  background-size: 56px 56px, 56px 56px, 280px 280px, 280px 280px;
  background-position: center top;
}

/* neutralise the shared section background helpers on this page */
body.about-page .section-soft,
body.about-page .service-section { background: transparent; }

.ab-wrap { background: var(--ab-bg); }

.ab-shell {
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(24px, 5vw, 64px);
}

/* shared section rhythm — separation via space + hairline, not fills */
.ab-block { padding: clamp(64px, 8vw, 108px) 0; }
.ab-block + .ab-block { border-top: 1px solid var(--line); }

.ab-eyebrow {
  display: inline-flex; align-items: center; gap: 12px;
  font-family: var(--font-en);
  font-size: 12.5px; font-weight: 600;
  letter-spacing: .2em; text-transform: uppercase;
  color: var(--green-600);
}
.ab-eyebrow::before {
  content: ""; width: 30px; height: 1.5px;
  background: var(--green); display: inline-block;
}

.ab-head { max-width: 820px; margin: 0 auto clamp(40px, 5vw, 64px); text-align: center; }
.ab-head-sub { margin-top: clamp(52px, 6vw, 80px); }
.ab-head h2 {
  font-size: clamp(28px, 3.4vw, 40px);
  font-weight: 600; color: var(--ink);
  letter-spacing: -0.01em; line-height: 1.25;
  margin: 18px 0 0;
}
.ab-head p {
  color: var(--muted);
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.7; margin: 16px 0 0;
}

/* ------------------------------------------------------------
   HERO · slogan (centered, blueprint frame)
   ------------------------------------------------------------ */
.ab-hero { padding: clamp(56px, 8vw, 112px) 0 clamp(44px, 6vw, 76px); }
.ab-hero-frame {
  position: relative;
  max-width: 1000px;
  margin: 0 auto;
  padding: clamp(44px, 6vw, 76px) clamp(28px, 5vw, 64px);
  text-align: center;
  border: 1px solid rgba(22,80,168,.1);
  border-radius: 4px;
}
/* accent corner brackets */
.bp-c {
  position: absolute;
  width: 40px; height: 40px;
  pointer-events: none;
}
.bp-c.tl {
  top: -1px; left: -1px;
  border-top: 2px solid var(--green);
  border-left: 2px solid var(--green);
}
.bp-c.br {
  bottom: -1px; right: -1px;
  border-bottom: 2px solid var(--blue);
  border-right: 2px solid var(--blue);
}
.ab-slogan {
  font-size: clamp(36px, 5.4vw, 68px);
  font-weight: 600;
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--ink);
  margin: 0;
}
.ab-slogan .grad {
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.ab-hero-sub {
  max-width: 820px;
  margin: 26px auto 0;
}
.ab-hero-sub p {
  color: var(--muted);
  font-size: clamp(14.5px, 1.1vw, 16.5px);
  line-height: 1.85;
  margin: 0 0 14px;
}
.ab-hero-sub p:last-child { margin-bottom: 0; }

/* metrics — centered, hairline dividers */
.ab-metrics {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin: clamp(36px, 4.5vw, 52px) auto 0;
  padding-top: clamp(32px, 4vw, 44px);
  border-top: 1px solid var(--line);
}
.ab-metric { padding: 4px 40px; }
.ab-metric + .ab-metric { border-left: 1px solid var(--line); }
.ab-metric .v {
  display: flex; align-items: baseline; justify-content: center; gap: 3px;
  font-family: var(--font-en);
  font-size: clamp(30px, 3.2vw, 42px);
  font-weight: 600;
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  letter-spacing: -0.02em;
}
.ab-metric .v .u {
  font-size: .42em; font-weight: 600;
  -webkit-text-fill-color: var(--green);
  color: var(--green);
}
.ab-metric .k {
  margin-top: 10px;
  font-size: 13.5px; color: var(--muted);
  letter-spacing: .02em;
  white-space: nowrap;
}

/* ------------------------------------------------------------
   INTRO · company + honors (centered)
   ------------------------------------------------------------ */
.ab-intro { max-width: 880px; margin: 0 auto; text-align: center; }
.ab-intro p {
  color: var(--ink-2);
  font-size: clamp(15px, 1.2vw, 17px);
  line-height: 1.9;
  margin: 0 0 18px;
}
.ab-intro p .hl { color: var(--ink); font-weight: 600; }

.ab-honors {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 12px;
  margin-top: 36px;
}
.ab-honor {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 11px 20px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: var(--ab-card);
  font-size: 14px; color: var(--ink-2);
  font-weight: 500;
  transition: border-color .2s, transform .2s;
}
.ab-honor:hover { border-color: rgba(30,160,151,.4); transform: translateY(-2px); }
.ab-honor .ic {
  width: 24px; height: 24px; flex: none;
  border-radius: 7px;
  display: grid; place-items: center;
  background: linear-gradient(135deg, rgba(30,160,151,.14), rgba(22,80,168,.14));
  color: var(--green-600);
  font-size: 12px;
}

/* ------------------------------------------------------------
   HISTORY · timeline (centerpiece)
   ------------------------------------------------------------ */
.ab-history-title {
  font-size: clamp(26px, 3vw, 40px);
  font-weight: 600; color: var(--ink);
  line-height: 1.3; letter-spacing: -0.01em;
  margin: 16px 0 0;
}
.ab-history-title .voyage {
  display: block;
  font-size: clamp(15px, 1.5vw, 20px);
  font-weight: 500;
  color: var(--blue);
  margin-top: 14px;
  letter-spacing: .01em;
}

.tl {
  position: relative;
  margin-top: clamp(48px, 6vw, 76px);
}
/* the rail */
.tl-rail {
  position: absolute;
  left: 207px;
  top: 10px; bottom: 10px;
  width: 2px;
  background: var(--green);
  opacity: .85;
}

.tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 72px;
  padding-bottom: clamp(48px, 5vw, 72px);
}
.tl-item:last-child { padding-bottom: 0; }

/* node */
.tl-dot {
  position: absolute;
  left: 201px; top: 6px;
  width: 14px; height: 14px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 4px var(--ab-bg);
  z-index: 2;
}
.tl-item.is-future .tl-dot {
  width: 20px; height: 20px;
  left: 198px; top: 3px;
  background: var(--blue);
  box-shadow: 0 0 0 4px var(--ab-bg), 0 0 0 8px rgba(30,160,151,.2);
}

.tl-year { text-align: right; padding-top: 0; padding-right: 8px; }
.tl-y {
  font-family: var(--font-en);
  font-size: clamp(24px, 2.4vw, 32px);
  font-weight: 600; color: var(--ink);
  letter-spacing: -0.01em; line-height: 1;
  white-space: nowrap;
}
.tl-phase {
  margin-top: 10px;
  font-size: 16px; font-weight: 600;
  color: var(--green-600);
  letter-spacing: .04em;
}
.tl-item.is-future .tl-phase { color: var(--blue); }

.tl-body { padding-top: 2px; }
.tl-points {
  list-style: none; margin: 0; padding: 0;
}
.tl-points li {
  position: relative;
  padding-left: 20px;
  color: var(--ink-2);
  font-size: clamp(14.5px, 1.1vw, 16px);
  line-height: 1.7;
  margin-bottom: 10px;
}
.tl-points li::before {
  content: "";
  position: absolute; left: 2px; top: .72em;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--green); opacity: .65;
}
.tl-points li .hl { color: var(--ink); font-weight: 600; }
.tl-points li.em {
  padding-left: 20px;
  margin-top: 16px;
  font-weight: 600; color: var(--ink);
  font-size: clamp(15px, 1.15vw, 17px);
}
.tl-points li.em::before {
  width: 9px; height: 9px; top: .62em; left: 0;
  background: var(--grad-brand); opacity: 1;
}

/* 2022–2025 category cards */
.tl-cats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin-top: 8px;
}
.tl-cat {
  border: 1px solid var(--line);
  border-left: 3px solid var(--green);
  border-radius: 0 12px 12px 0;
  padding: 16px 20px;
  background: var(--ab-card);
}
.tl-cat:nth-child(2) { border-left-color: #1773B6; }
.tl-cat:nth-child(3) { border-left-color: var(--blue); }
.tl-cat .lab {
  display: inline-block;
  font-size: 13.5px; font-weight: 600;
  color: var(--ink);
  letter-spacing: .03em;
  margin-bottom: 6px;
}
.tl-cat p {
  margin: 0; color: var(--muted);
  font-size: 14.5px; line-height: 1.65;
}

/* ------------------------------------------------------------
   SERVICE NETWORK
   ------------------------------------------------------------ */
.ab-net-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.ab-net-card {
  position: relative;
  background: var(--ab-card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 26px 26px 24px;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.ab-net-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(30,160,151,.3);
}
.ab-net-card.hq {
  border-color: rgba(30,160,151,.4);
}
.ab-net-tag {
  display: inline-block;
  font-family: var(--font-en);
  font-size: 11px; font-weight: 600;
  letter-spacing: .08em;
  color: var(--green-600);
  padding: 5px 12px;
  border: 1px solid rgba(30,160,151,.3);
  border-radius: 999px;
  margin-bottom: 18px;
}
.ab-net-card.hq .ab-net-tag {
  background: var(--grad-brand);
  color: #fff; border-color: transparent;
}
.ab-net-city {
  font-size: 22px; font-weight: 600; color: var(--ink);
}
.ab-net-en {
  font-family: var(--font-en);
  font-size: 12.5px; color: var(--muted);
  letter-spacing: .08em; margin-top: 2px;
}
.ab-net-addr {
  margin-top: 14px;
  font-size: 13.5px; color: var(--muted);
  line-height: 1.6;
}

/* ------------------------------------------------------------
   CTA · light bordered card (no dark band)
   ------------------------------------------------------------ */
.ab-cta { padding-bottom: clamp(80px, 9vw, 120px); }
.ab-cta-card {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: 24px;
  background: var(--ab-card);
  padding: clamp(40px, 5vw, 64px) clamp(32px, 5vw, 72px);
  display: flex; align-items: center; justify-content: space-between;
  gap: 40px; flex-wrap: wrap;
}
.ab-cta-card::before {
  content: "";
  position: absolute; inset: 0; z-index: 0;
  background: radial-gradient(80% 140% at 100% 0%, rgba(30,160,151,.08), transparent 60%);
  pointer-events: none;
}
.ab-cta-card > * { position: relative; z-index: 1; }
.ab-cta-card h2 {
  font-size: clamp(24px, 2.8vw, 36px);
  font-weight: 600; color: var(--ink);
  line-height: 1.3; margin: 10px 0 0;
  letter-spacing: -0.01em;
}
.ab-cta-actions { display: flex; gap: 14px; flex-wrap: wrap; }
.btn-outline-dark {
  border: 1px solid var(--line);
  background: #fff; color: var(--ink);
  padding: 13px 22px; border-radius: 999px;
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 500; transition: border-color .2s, color .2s;
}
.btn-outline-dark:hover { border-color: var(--green); color: var(--green-600); }

/* ------------------------------------------------------------
   INTRO CARDS · positioning (image3) + stats (image4)
   ------------------------------------------------------------ */
.ab-pos-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
  margin-top: clamp(40px, 5vw, 56px);
}
.ab-pos-card {
  position: relative;
  background: var(--ab-card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 40px 36px 38px;
  text-align: left;
  overflow: hidden;
  isolation: isolate;
  min-height: 268px;
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-sm);
  transition: transform .3s cubic-bezier(.2,.7,.2,1), box-shadow .3s, border-color .3s;
}
/* top accent rule */
.ab-pos-card::before {
  content: "";
  position: absolute; top: 0; left: 40px; right: 40px; height: 3px;
  background: var(--grad-brand);
  border-radius: 0 0 4px 4px;
  opacity: .85;
}
.ab-pos-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(30,160,151,.32);
}
.ab-pos-num {
  display: inline-flex; align-items: center; gap: 13px;
  font-family: var(--font-en);
  font-size: 38px; font-weight: 800;
  letter-spacing: -.02em; line-height: 1;
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
}
.ab-pos-num::after {
  content: ""; width: 38px; height: 2px;
  background: var(--grad-brand);
  border-radius: 2px; opacity: .5;
}
.ab-pos-lead {
  display: block;
  font-size: 24px; font-weight: 700;
  color: var(--ink);
  margin-top: 26px;
  letter-spacing: .01em;
}
.ab-pos-card p {
  margin: 14px 0 0;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.78;
  max-width: 30ch;
}

.ab-stat-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 22px;
  margin-top: clamp(30px, 3.4vw, 44px);
}
.ab-stat-card {
  position: relative;
  background: var(--ab-card);
  border: 1px solid var(--line);
  border-radius: 20px;
  padding: 46px 24px 40px;
  text-align: center;
  overflow: hidden;
  isolation: isolate;
  box-shadow: var(--shadow-sm);
  transition: transform .3s cubic-bezier(.2,.7,.2,1), box-shadow .3s, border-color .3s;
}
.ab-stat-card::before {
  content: "";
  position: absolute; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(22,80,168,.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22,80,168,.05) 1px, transparent 1px);
  background-size: 22px 22px;
  -webkit-mask-image: radial-gradient(120% 90% at 50% 0%, black, transparent 72%);
  mask-image: radial-gradient(120% 90% at 50% 0%, black, transparent 72%);
  opacity: 0; transition: opacity .3s;
}
.ab-stat-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
  border-color: rgba(30,160,151,.32);
}
.ab-stat-card:hover::before { opacity: 1; }
.ab-stat-v {
  display: flex; align-items: baseline; justify-content: center; gap: 3px;
  font-family: var(--font-en);
  font-size: clamp(42px, 4.4vw, 58px);
  font-weight: 700;
  background: var(--grad-brand);
  -webkit-background-clip: text; background-clip: text;
  color: transparent;
  letter-spacing: -0.03em; line-height: 1;
}
.ab-stat-v .u {
  font-size: .4em; font-weight: 700;
  -webkit-text-fill-color: var(--green);
  color: var(--green);
}
.ab-stat-k {
  position: relative;
  margin-top: 20px; padding-top: 18px;
  font-size: 15px; color: var(--muted);
  letter-spacing: .02em;
}
.ab-stat-k::before {
  content: ""; position: absolute; top: 0; left: 50%; transform: translateX(-50%);
  width: 30px; height: 2px;
  background: rgba(22,80,168,.2);
  border-radius: 2px;
}

/* ------------------------------------------------------------
   HONORS · 荣誉资质 (check cards)
   ------------------------------------------------------------ */
.ab-honor-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  max-width: 820px;
  margin: clamp(36px, 4.5vw, 52px) auto 0;
  background: var(--ab-card);
  border: 1px solid var(--line);
  border-radius: 18px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.ab-honor-card {
  display: flex; align-items: center; gap: 16px;
  padding: 26px 30px;
  text-align: left;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
  transition: background .2s;
}
.ab-honor-card:nth-child(-n+2) { border-top: none; }
.ab-honor-card:nth-child(odd) { border-left: none; }
.ab-honor-card:hover {
  background: rgba(30,160,151,.04);
}
.ab-honor-card .chk {
  width: 30px; height: 30px; flex: none;
  border-radius: 50%;
  display: grid; place-items: center;
  background: var(--grad-brand);
  color: #fff;
  box-shadow: 0 4px 10px rgba(30,160,151,.28);
}
.ab-honor-card .t {
  font-size: 16px; color: var(--ink);
  font-weight: 600; line-height: 1.45;
  letter-spacing: .01em;
}

/* ------------------------------------------------------------
   CUSTOMERS · 客户 logo 墙
   ------------------------------------------------------------ */
.cust-stage {
  position: relative;
  margin-top: clamp(36px, 4.5vw, 52px);
}
.cust-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 56px;
  height: 56px;
  display: grid;
  place-items: center;
  border: none;
  background: transparent;
  color: var(--line);
  cursor: pointer;
  padding: 0;
  z-index: 5;
  transition: color .2s, transform .2s;
}
.cust-arrow:hover { color: var(--muted); }
.cust-arrow:active { transform: translateY(-50%) scale(.92); }
.cust-arrow--prev { left: -104px; }
.cust-arrow--next { right: -104px; }
@media (max-width: 1260px) {
  .cust-arrow--prev { left: -8px; }
  .cust-arrow--next { right: -8px; }
}
.cust-panel {
  opacity: 0;
  visibility: hidden;
  transition: opacity .6s ease;
}
.cust-panel.is-active {
  position: relative;
  opacity: 1;
  visibility: visible;
}
.cust-panel:not(.is-active) {
  position: absolute;
  inset: 0;
}
.cust-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
}
.cust-grid--name .cust-card {
  font-size: 16px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: .02em;
  text-align: center;
}
.cust-card {
  display: grid;
  place-items: center;
  height: 124px;
  padding: 18px 26px;
  background: var(--ab-card);
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: var(--shadow-sm);
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.cust-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(30,160,151,.3);
}
.cust-card img {
  max-width: 86%;
  max-height: 64px;
  width: auto; height: auto;
  object-fit: contain;
}
.cust-card--lg img {
  max-width: 95%;
  max-height: 80px;
}
.cust-more {
  margin: 28px 0 0;
  text-align: center;
  color: var(--muted);
  font-size: 15px;
  letter-spacing: .02em;
}

/* ------------------------------------------------------------
   RESPONSIVE
   ------------------------------------------------------------ */
@media (max-width: 920px) {
  .ab-pos-grid { grid-template-columns: 1fr; }
  .ab-stat-grid { grid-template-columns: repeat(2, 1fr); }
  .ab-honor-grid { grid-template-columns: repeat(2, 1fr); }
  .cust-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 680px) {
  .ab-metric { padding: 4px 24px; }
  .ab-hero-frame { padding: 36px 20px; }
  .ab-stat-grid, .ab-honor-grid { grid-template-columns: 1fr; }
  .ab-honor-card { border-left: none; border-top: 1px solid var(--line); }
  .ab-honor-card:first-child { border-top: none; }
  .cust-grid { grid-template-columns: repeat(2, 1fr); }
  .tl-rail { left: 7px; }
  .tl-item {
    grid-template-columns: 1fr;
    gap: 14px;
    padding-left: 34px;
  }
  .tl-dot { left: 0; }
  .tl-item.is-future .tl-dot { left: -2px; }
  .tl-year { text-align: left; display: flex; align-items: baseline; gap: 12px; }
  .tl-phase { margin-top: 0; }
}