/* ============================================================
   公司介绍页 (cn/about.html) — page-specific layout, ab-* classes.
   Uses only the shared colour/shadow variables from style.css.
   ============================================================ */

.ab-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--color-primary);
}

.ab-eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: currentColor;
}

.ab-h2 {
  font-size: 40px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--color-gray-900);
}

.ab-section {
  padding: 112px 0;
}

/* --- Hero --- */
.ab-hero {
  position: relative;
  overflow: hidden;
  padding: calc(var(--header-height) + 104px) 0 112px;
  background: var(--gradient-hero);
  color: var(--color-white);
}

.ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.04) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: linear-gradient(180deg, #000 0%, transparent 90%);
  -webkit-mask-image: linear-gradient(180deg, #000 0%, transparent 90%);
}

.ab-hero::after {
  content: "";
  position: absolute;
  right: -160px;
  top: -120px;
  width: 620px;
  height: 620px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(37, 99, 235, 0.35) 0%, transparent 65%);
}

.ab-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
  gap: 72px;
  align-items: center;
}

.ab-hero .ab-eyebrow {
  color: var(--color-accent);
}

.ab-hero-title {
  margin: 22px 0 14px;
  font-size: 76px;
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: 0.04em;
}

.ab-hero-sub {
  font-size: 30px;
  font-weight: 800;
  line-height: 1.35;
  background: var(--gradient-primary);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.ab-hero-lead {
  max-width: 560px;
  margin-top: 26px;
  font-size: 18px;
  line-height: 1.9;
  color: rgba(255, 255, 255, 0.72);
}

.ab-hero-lead strong {
  color: var(--color-white);
}

.ab-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 40px;
}

.ab-btn-ghost {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 16px 28px;
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-full);
  font-size: 16px;
  font-weight: 600;
  color: var(--color-white);
  transition: background var(--transition-fast), border-color var(--transition-fast);
}

.ab-btn-ghost:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: rgba(255, 255, 255, 0.5);
}

/* Fact sheet card in the hero */
.ab-facts {
  padding: 34px 36px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-xl);
  background: rgba(255, 255, 255, 0.05);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  box-shadow: 0 30px 60px rgba(2, 6, 23, 0.35);
}

.ab-facts-title {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: rgba(255, 255, 255, 0.5);
  margin-bottom: 10px;
}

.ab-facts dl {
  margin: 0;
}

.ab-fact {
  display: grid;
  grid-template-columns: 96px 1fr;
  gap: 16px;
  padding: 17px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.ab-fact:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.ab-fact dt {
  font-size: 14px;
  color: rgba(255, 255, 255, 0.5);
}

.ab-fact dd {
  margin: 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--color-white);
}

/* --- About (editorial two-column) --- */
.ab-about-head {
  margin-bottom: 56px;
}

.ab-about-head .ab-h2 {
  margin-top: 18px;
}

.ab-br-m {
  display: none;
}

.ab-about-inner {
  display: grid;
  grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
  gap: 72px;
  align-items: center;
}

.ab-about-photo {
  margin: 0;
}

.ab-about-photo-frame {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.ab-about-photo img {
  display: block;
  width: 100%;
  height: auto;
}

.ab-about-photo-tag {
  position: absolute;
  left: 20px;
  bottom: 20px;
  padding: 8px 16px;
  border-radius: var(--radius-full);
  background: rgba(15, 23, 42, 0.78);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-white);
}

.ab-about-photo figcaption {
  margin-top: 14px;
  font-size: 14px;
  color: var(--color-gray-500);
}

.ab-timeline {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
}

.ab-tl-item:not(:last-child)::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 24px;
  bottom: -28px;
  width: 2px;
  background: var(--color-primary-100);
}

.ab-tl-item {
  position: relative;
  padding-left: 40px;
}

.ab-tl-item + .ab-tl-item {
  margin-top: 32px;
}

.ab-tl-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 16px;
  height: 16px;
  border: 3px solid var(--color-primary);
  border-radius: 50%;
  background: var(--color-white);
}

.ab-tl-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.12em;
  color: var(--color-primary);
}

.ab-tl-title {
  margin-top: 6px;
  font-size: 21px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--color-gray-900);
}

.ab-tl-item p {
  margin-top: 6px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-gray-600);
}

.ab-tl-item strong {
  color: var(--color-gray-900);
  white-space: nowrap;
}

.nw {
  white-space: nowrap;
}

.ab-tl-item.is-now::before {
  border: 0;
  background: var(--gradient-primary);
  box-shadow: 0 0 0 5px var(--color-primary-100);
}

.ab-tl-item.is-now .ab-tl-title {
  color: var(--color-primary);
}

/* --- Firsts --- */
.ab-firsts {
  background: var(--color-gray-50);
}

.ab-section-head {
  max-width: 720px;
  margin-bottom: 56px;
}

.ab-section-head .ab-h2 {
  margin-top: 16px;
}

.ab-section-head p {
  margin-top: 14px;
  font-size: 17px;
  line-height: 1.8;
  color: var(--color-gray-500);
}

.ab-firsts-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 16px;
}

.ab-first {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 28px 22px 26px;
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  background: var(--color-white);
  overflow: hidden;
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.ab-first::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  right: 0;
  height: 4px;
  background: var(--gradient-primary);
}

.ab-first:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
}

.ab-first-num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--color-gray-400);
}

.ab-first-badge {
  align-self: flex-start;
  margin-top: 28px;
  padding: 4px 12px;
  border-radius: var(--radius-full);
  background: var(--color-primary-50);
  font-size: 13px;
  font-weight: 700;
  color: var(--color-primary);
}

.ab-first-name {
  margin-top: 14px;
  font-size: 24px;
  font-weight: 900;
  line-height: 1.3;
  color: var(--color-gray-900);
}

.ab-first-kind {
  margin-top: 8px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-gray-500);
}

/* Logic + tool pair */
.ab-pair {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px;
  margin-top: 20px;
}

.ab-pair-card {
  padding: 40px 40px 42px;
  border-radius: var(--radius-xl);
}

.ab-pair-logic {
  border: 1px solid var(--color-primary-100);
  background: var(--color-white);
}

.ab-pair-tool {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--color-primary-100);
  background: linear-gradient(135deg, var(--color-primary-50) 0%, var(--color-white) 100%);
}

.ab-pair-tool::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(6, 182, 212, 0.12) 0%, transparent 70%);
}

.ab-pair-label {
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-primary);
}


.ab-pair-name {
  margin-top: 14px;
  font-size: 34px;
  font-weight: 900;
  color: var(--color-gray-900);
}

.ab-pair-tool .ab-pair-label,
.ab-pair-tool .ab-pair-name {
  position: relative;
  z-index: 1;
}

.ab-pair-desc {
  position: relative;
  z-index: 1;
  margin-top: 12px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--color-gray-600);
}

/* --- Mission --- */
.ab-mission-inner {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  gap: 80px;
  align-items: start;
}

.ab-mission-head .ab-h2 {
  margin-top: 18px;
}

.ab-mission-head p {
  margin-top: 18px;
  font-size: 17px;
  line-height: 1.9;
  color: var(--color-gray-600);
}

.ab-mission-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--color-gray-200);
}

.ab-mission-item {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 8px;
  align-items: baseline;
  padding: 30px 0;
  border-bottom: 1px solid var(--color-gray-200);
}

.ab-mission-num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  color: var(--color-primary);
}

.ab-mission-item h3 {
  font-size: 24px;
  font-weight: 800;
  line-height: 1.5;
  color: var(--color-gray-900);
}

/* --- Closing statement --- */
.ab-closing {
  position: relative;
  overflow: hidden;
  padding: 120px 0;
  background: linear-gradient(135deg, #0b1533 0%, var(--color-primary-900) 100%);
  color: var(--color-white);
  text-align: center;
}

.ab-closing::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -260px;
  width: 900px;
  height: 520px;
  transform: translateX(-50%);
  background: radial-gradient(ellipse, rgba(59, 130, 246, 0.35) 0%, transparent 70%);
}

.ab-closing .container {
  position: relative;
  z-index: 1;
  max-width: 920px;
}

.ab-closing-quote {
  font-size: 44px;
  font-weight: 900;
  line-height: 1.45;
}

.ab-closing-quote em {
  font-style: normal;
  background: linear-gradient(135deg, #60a5fa 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.ab-closing-text {
  margin: 28px auto 0;
  max-width: 760px;
  font-size: 18px;
  line-height: 2;
  color: rgba(255, 255, 255, 0.72);
}

.ab-closing-cta {
  margin-top: 56px;
  padding-top: 44px;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.ab-closing-cta-sub {
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--color-accent);
}

.ab-closing-cta-main {
  margin: 12px auto 28px;
  max-width: 640px;
  font-size: 20px;
  font-weight: 700;
  line-height: 1.7;
}

.ab-closing .ab-hero-actions {
  justify-content: center;
  margin-top: 0;
}

/* --- Responsive --- */
@media (max-width: 1024px) {
  .ab-hero-inner,
  .ab-about-inner,
  .ab-mission-inner {
    grid-template-columns: 1fr;
    gap: 48px;
  }

  .ab-firsts-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .ab-first {
    grid-column: span 2;
  }

  .ab-first:nth-child(n + 4) {
    grid-column: span 3;
  }
}

@media (max-width: 768px) {
  .ab-about-head {
    margin-bottom: 36px;
  }

  .ab-br-m {
    display: inline;
  }

  .ab-tl-title {
    font-size: 19px;
  }

  .ab-tl-item p {
    font-size: 15px;
  }

  .ab-section {
    padding: 72px 0;
  }

  .ab-hero {
    padding: calc(var(--header-height) + 56px) 0 72px;
  }

  .ab-hero-title {
    font-size: 52px;
  }

  .ab-hero-sub {
    font-size: 22px;
  }

  .ab-hero-lead,
  .ab-closing-text {
    font-size: 16px;
  }

  .ab-facts {
    padding: 26px 24px;
  }

  .ab-fact {
    grid-template-columns: 80px 1fr;
    padding: 14px 0;
  }

  .ab-h2 {
    font-size: 30px;
  }

  .ab-section-head {
    margin-bottom: 36px;
  }

  .ab-pair {
    grid-template-columns: 1fr;
  }

  .ab-pair-card {
    padding: 30px 26px;
  }

  .ab-pair-name {
    font-size: 28px;
  }

  .ab-mission-item {
    grid-template-columns: 52px 1fr;
    padding: 22px 0;
  }

  .ab-mission-item h3 {
    font-size: 19px;
  }

  .ab-closing {
    padding: 80px 0;
  }

  .ab-closing-quote {
    font-size: 28px;
  }

  .ab-closing-cta-main {
    font-size: 17px;
  }
}

@media (max-width: 480px) {
  .ab-firsts-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 12px;
  }

  .ab-first,
  .ab-first:nth-child(n + 4) {
    grid-column: span 1;
  }

  .ab-first:last-child {
    grid-column: 1 / -1;
  }

  .ab-first {
    padding: 22px 16px 20px;
  }

  .ab-first-badge {
    margin-top: 14px;
    padding: 3px 10px;
    font-size: 12px;
  }

  .ab-first-name {
    margin-top: 10px;
    font-size: 20px;
  }

  .ab-first-kind {
    font-size: 13px;
  }

  .ab-hero-actions .btn,
  .ab-hero-actions .ab-btn-ghost {
    width: 100%;
    justify-content: center;
  }
}