/* ═══════════════════════════════════════════════════════════
   about.css — HANLIAN AUTO 关于我们
   浅色B2B专业风 · 统一字体 · 精致微动效
   ═══════════════════════════════════════════════════════════ */

:root {
  --ab-transition: cubic-bezier(0.22, 0.61, 0.36, 1);
  --ab-ease-out: cubic-bezier(0.25, 1, 0.5, 1);
}

/* ═══════════════════════════════════════════
   SECTION
   ═══════════════════════════════════════════ */
.ab-section { position: relative; overflow: hidden; }
.ab-section-light { padding: clamp(60px, 8vw, 100px) 0; background: #fff; }
.ab-section-dark  { padding: clamp(60px, 8vw, 100px) 0; background: var(--color-bg-alt); }
.ab-section-bg    { padding: clamp(60px, 8vw, 100px) 0; background: #f6f6f6; }

/* ═══════════════════════════════════════════
   统一标题
   ═══════════════════════════════════════════ */
.ab-overline-light {
  font-size: 0.65rem; font-weight: 600; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--color-accent);
  display: block; margin-bottom: 0.75rem;
}
.ab-heading-light {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.12;
  color: var(--color-text); margin-bottom: 0.75rem;
}
.ab-lead-light {
  font-size: 0.88rem; color: var(--color-text-muted);
  line-height: 1.65; max-width: 500px; margin-bottom: 2.5rem;
}
.ab-section-label {
  font-size: 0.65rem; font-weight: 600; letter-spacing: 0.18em;
  text-transform: uppercase; color: var(--color-accent);
  display: block; margin-bottom: 0.75rem;
}
.ab-section-title {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.4rem);
  font-weight: 600; letter-spacing: -0.02em; line-height: 1.12;
  color: var(--color-text); margin-bottom: 1rem;
}
.ab-section-sub {
  font-size: 0.88rem; color: var(--color-text-muted);
  line-height: 1.65; max-width: 520px; margin-bottom: 1.5rem;
}
.ab-section-header-left { max-width: 640px; margin-bottom: 2.5rem; }
.ab-section-header-left p { font-size: 0.88rem; color: var(--color-text-muted); line-height: 1.65; max-width: 520px; }
.ab-section-header-center { text-align: center; max-width: 640px; margin: 0 auto 2.5rem; }

/* ═══════════════════════════════════════════
   HERO — 全屏大图
   ═══════════════════════════════════════════ */
.ab-hero {
  position: relative; width: 100%; min-height: 100vh;
  display: flex; align-items: center; justify-content: center;
  overflow: hidden; background: #0a0e17;
}
.ab-hero-bg { position: absolute; inset: 0; z-index: 0; }
.ab-hero-img {
  width: 100%; height: 100%; object-fit: cover;
  filter: brightness(0.42) saturate(0.6);
  transform: scale(1.05);
}
.ab-hero-gradient {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 75% 30%, rgba(196,30,58,0.12) 0%, transparent 55%),
    radial-gradient(ellipse at 25% 60%, rgba(6,130,219,0.06) 0%, transparent 45%),
    linear-gradient(180deg, rgba(10,14,23,0.3) 0%, rgba(10,14,23,0.6) 60%, rgba(10,14,23,0.8) 100%);
}
.ab-hero-content {
  position: relative; z-index: 2; text-align: center;
  padding: 0 24px; max-width: 960px; padding-top: var(--nav-height);
}
.ab-hero-tag-row {
  display: flex; align-items: center; justify-content: center;
  gap: 20px; margin-bottom: 2rem;
}
.ab-hero-line { width: 40px; height: 1px; background: rgba(255,255,255,0.2); }
.ab-hero-tag {
  font-size: 0.6rem; font-weight: 600; letter-spacing: 0.28em;
  text-transform: uppercase; color: rgba(255,255,255,0.4);
}
.ab-hero-title {
  font-family: var(--font-display);
  font-size: clamp(2.8rem, 7vw, 5.5rem); font-weight: 600;
  line-height: 1.06; color: #fff;
  letter-spacing: -0.03em; margin-bottom: 1.5rem;
}
.ab-title-accent { color: var(--color-accent); }
.ab-hero-sub {
  font-size: clamp(0.85rem, 1.3vw, 0.95rem);
  color: rgba(255,255,255,0.45); font-weight: 400;
  line-height: 1.7; max-width: 600px; margin: 0 auto 2.5rem;
}
.ab-hero-stats-row {
  display: flex; justify-content: center;
  gap: clamp(20px, 5vw, 60px); flex-wrap: wrap;
}
.ab-hero-stat {
  text-align: center; padding: 0 16px;
  border-left: 1px solid rgba(255,255,255,0.08);
}
.ab-hero-stat:first-child { border-left: none; }
.ab-hero-stat-num {
  display: block; font-family: var(--font-display);
  font-size: clamp(1.6rem, 2.8vw, 2.4rem); font-weight: 600;
  color: #fff; line-height: 1; margin-bottom: 4px;
}
.ab-hero-stat-num span { font-size: 0.8rem; color: var(--color-accent); }
.ab-hero-stat-label {
  font-size: 0.55rem; font-weight: 500; letter-spacing: 0.1em;
  text-transform: uppercase; color: rgba(255,255,255,0.25);
}
.ab-hero-scroll {
  position: absolute; bottom: 36px; left: 50%; transform: translateX(-50%);
  z-index: 3; display: flex; flex-direction: column; align-items: center;
  gap: 8px; color: rgba(255,255,255,0.2);
  font-size: 0.5rem; letter-spacing: 0.22em; text-transform: uppercase;
}
.ab-hero-scroll-line {
  width: 1px; height: 28px; background: rgba(255,255,255,0.08);
  position: relative; overflow: hidden;
}
.ab-hero-scroll-dot {
  position: absolute; top: 0; left: -1px;
  width: 3px; height: 8px; background: var(--color-accent); border-radius: 2px;
  animation: abScrollDot 2s ease-in-out infinite;
}
@keyframes abScrollDot { 0%{transform:translateY(-100%);opacity:0} 20%{opacity:1} 80%{opacity:1} 100%{transform:translateY(28px);opacity:0} }

/* ═══════════════════════════════════════════
   SPLIT LAYOUT
   ═══════════════════════════════════════════ */
.ab-split {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(40px, 6vw, 80px); align-items: center;
  margin-top: 1.5rem;
}
.ab-split-img-wrap { position: relative; }
.ab-img-reveal { overflow: hidden; border-radius: 12px; }
.ab-img-reveal img {
  width: 100%; height: 420px; object-fit: cover; display: block;
  filter: brightness(0.95);
  transition: transform 0.6s var(--ab-ease-out);
}
.ab-img-reveal:hover img { transform: scale(1.04); }
.ab-img-badge {
  position: absolute; bottom: -16px; right: -12px;
  background: var(--color-accent); color: #fff;
  padding: 10px 20px; border-radius: 8px;
  font-size: 0.55rem; letter-spacing: 0.08em;
  text-transform: uppercase; text-align: center;
  z-index: 2; box-shadow: 0 8px 28px rgba(196,30,58,0.3);
}
.ab-img-badge span { display: block; font-weight: 400; opacity: 0.8; margin-bottom: 2px; }
.ab-img-badge strong { display: block; font-weight: 700; font-size: 0.72rem; }
.ab-split-text { max-width: 520px; }
.ab-body-text p { font-size: 0.9rem; color: var(--color-text-muted); line-height: 1.75; margin-bottom: 1rem; }
.ab-body-text strong { color: var(--color-text); font-weight: 600; }
.ab-tag-row { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 1.25rem; }
.ab-tag-row span {
  padding: 5px 14px; font-size: 0.6rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  border: 1px solid var(--color-border); border-radius: 20px;
  color: var(--color-text-muted); transition: all 0.25s;
}
.ab-tag-row span:hover { border-color: var(--color-accent); color: var(--color-accent); background: rgba(196,30,58,0.03); }

/* ═══════════════════════════════════════════
   HISTORY 时间线
   ═══════════════════════════════════════════ */
.ab-history-section { padding-top: clamp(60px, 8vw, 100px); padding-bottom: clamp(60px, 8vw, 100px); background: var(--color-bg-alt); }
.ab-history-grid {
  display: flex; flex-direction: column;
  gap: clamp(40px, 6vw, 80px);
  max-width: 960px; margin: 0 auto;
  position: relative;
}
.ab-history-grid::before {
  content: ''; position: absolute; left: 50%; top: 0; bottom: 0;
  width: 1px; transform: translateX(-50%);
  background: linear-gradient(to bottom,
    transparent 0%, rgba(196,30,58,0.12) 5%, rgba(196,30,58,0.12) 95%, transparent 100%);
}
.ab-h-item {
  display: grid; grid-template-columns: 1fr 1fr;
  gap: clamp(30px, 5vw, 60px); align-items: center;
  position: relative;
}
.ab-h-reverse .ab-h-image { order: 2; }
.ab-h-reverse .ab-h-content { order: 1; text-align: right; }
.ab-h-reverse .ab-h-content .ab-h-dot { margin-left: auto; }
.ab-h-image {
  position: relative; border-radius: 14px; overflow: hidden;
  aspect-ratio: 4/3;
  box-shadow: 0 8px 32px rgba(0,0,0,0.08);
  transition: transform 0.4s var(--ab-ease-out), box-shadow 0.4s;
}
.ab-h-image:hover { transform: translateY(-4px); box-shadow: 0 16px 40px rgba(0,0,0,0.12); }
.ab-h-image img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  filter: brightness(0.9);
  transition: transform 0.6s var(--ab-ease-out), filter 0.5s;
}
.ab-h-image:hover img { transform: scale(1.05); filter: brightness(1); }
.ab-h-year-tag {
  position: absolute; top: 14px; left: 14px;
  padding: 5px 14px; background: var(--color-accent);
  color: #fff; font-family: 'Inter', sans-serif;
  font-size: 0.75rem; font-weight: 700; letter-spacing: 0.06em;
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(196,30,58,0.4);
  z-index: 2;
}
.ab-h-reverse .ab-h-year-tag { left: auto; right: 14px; }
.ab-h-content { position: relative; }
.ab-h-dot {
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--color-accent);
  border: 3px solid rgba(196,30,58,0.15);
  margin-bottom: 16px;
}
.ab-h-content h3 {
  font-family: var(--font-display); font-size: 1.25rem;
  font-weight: 600; color: var(--color-text);
  margin-bottom: 0.6rem; letter-spacing: -0.01em;
}
.ab-h-content p { font-size: 0.85rem; color: var(--color-text-muted); line-height: 1.7; max-width: 380px; }
.ab-h-reverse .ab-h-content p { margin-left: auto; }
.ab-h-content p strong { color: var(--color-text); font-weight: 600; }
.ab-h-item::after {
  content: ''; position: absolute;
  left: 50%; top: 20px;
  width: 8px; height: 8px;
  background: #fff;
  border: 2px solid rgba(196,30,58,0.25);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  z-index: 1;
}

/* ═══════════════════════════════════════════
   3列图片条
   ═══════════════════════════════════════════ */
.ab-img-strip-3 {
  display: grid; grid-template-columns: repeat(3, 1fr);
  gap: 24px; margin-top: 0.5rem;
}
.ab-img-strip-3-item {
  border-radius: 10px; overflow: hidden;
  background: #fff; border: 1px solid var(--color-border);
  transition: all 0.35s var(--ab-ease-out);
}
.ab-img-strip-3-item:hover { transform: translateY(-4px); box-shadow: 0 12px 32px rgba(0,0,0,0.06); }
.ab-strip-img-wrap { height: 260px; overflow: hidden; background: #f6f6f6; }
.ab-strip-img-wrap img {
  width: 100%; height: 100%; object-fit: cover; display: block;
  transition: transform 0.5s var(--ab-ease-out);
}
.ab-img-strip-3-item:hover .ab-strip-img-wrap img { transform: scale(1.04); }
.ab-strip-label { padding: 14px 16px; font-size: 0.72rem; font-weight: 600; color: var(--color-text); text-align: center; }

/* ═══════════════════════════════════════════
   资质证书
   ═══════════════════════════════════════════ */
.ab-cred-grid {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 24px; margin-top: 0.5rem;
}
.ab-cred-card {
  background: #fff; border: 1px solid var(--color-border);
  border-radius: 12px; overflow: hidden; cursor: pointer;
  transition: all 0.35s var(--ab-ease-out);
}
.ab-cred-card:hover { transform: translateY(-4px); box-shadow: 0 12px 36px rgba(0,0,0,0.06); border-color: rgba(196,30,58,0.15); }
.ab-cred-img-wrap { height: 300px; background: #f8f8f8; display: flex; align-items: center; justify-content: center; padding: 16px; overflow: hidden; }
.ab-cred-img-wrap img { max-width: 100%; max-height: 100%; object-fit: contain; transition: transform 0.5s var(--ab-ease-out); }
.ab-cred-card:hover .ab-cred-img-wrap img { transform: scale(1.04); }
.ab-cred-label { padding: 14px 16px; border-top: 1px solid var(--color-border); font-size: 0.7rem; font-weight: 600; text-align: center; color: var(--color-text); }
.ab-cred-hint { display: block; font-size: 0.58rem; font-weight: 400; color: var(--color-text-dim); margin-top: 3px; }

/* ═══════════════════════════════════════════
   办公环境
   ═══════════════════════════════════════════ */
.ab-facility-feature {
  position: relative; border-radius: 12px; overflow: hidden; margin-bottom: 14px;
}
.ab-facility-feature img {
  width: 100%; height: 360px; object-fit: cover; display: block;
  filter: brightness(0.92);
  transition: transform 0.6s var(--ab-ease-out);
}
.ab-facility-feature:hover img { transform: scale(1.02); }
.ab-facility-feature-label {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 24px 20px; background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 100%);
  font-size: 0.8rem; font-weight: 600; color: rgba(255,255,255,0.8);
}
.ab-facility-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.ab-facility-item {
  position: relative; border-radius: 10px; overflow: hidden;
  transition: transform 0.3s var(--ab-ease-out);
}
.ab-facility-item:hover { transform: translateY(-2px); }
.ab-facility-item img {
  width: 100%; height: 200px; object-fit: cover; display: block;
  filter: brightness(0.9);
  transition: all 0.5s var(--ab-ease-out);
}
.ab-facility-item:hover img { transform: scale(1.03); filter: brightness(1); }
.ab-facility-label {
  position: absolute; bottom: 0; left: 0; right: 0;
  padding: 16px 12px; background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 100%);
  font-size: 0.65rem; font-weight: 500; letter-spacing: 0.04em;
  color: rgba(255,255,255,0.6);
}
.ab-facility-placeholder {
  border: 1px dashed var(--color-border);
  display: flex; align-items: center; justify-content: center;
  min-height: 200px; background: #fafafa;
}

/* ═══════════════════════════════════════════
   占位符
   ═══════════════════════════════════════════ */
.ab-placeholder-inner {
  display: flex; flex-direction: column; align-items: center;
  gap: 8px; color: rgba(0,0,0,0.08); text-align: center;
}
.ab-placeholder-inner span { font-size: 0.62rem; letter-spacing: 0.06em; text-transform: uppercase; }

/* ═══════════════════════════════════════════
   VALUES
   ═══════════════════════════════════════════ */
.ab-values-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; margin-top: 1.5rem; }
.ab-value-card {
  padding: 2rem 1.5rem; text-align: center;
  background: #fff; border: 1px solid var(--color-border);
  border-radius: 12px; transition: all 0.35s var(--ab-ease-out);
}
.ab-value-card:hover { transform: translateY(-4px); box-shadow: 0 10px 30px rgba(0,0,0,0.05); border-color: rgba(196,30,58,0.12); }
.ab-value-icon {
  width: 48px; height: 48px; margin: 0 auto 1rem;
  display: flex; align-items: center; justify-content: center;
  background: rgba(196,30,58,0.06); border-radius: 12px;
  color: var(--color-accent);
}
.ab-value-card h3 { font-family: var(--font-display); font-size: 0.95rem; font-weight: 600; margin-bottom: 0.6rem; color: var(--color-text); }
.ab-value-card p { font-size: 0.8rem; color: var(--color-text-muted); line-height: 1.6; }

/* ═══════════════════════════════════════════
   LIGHTBOX
   ═══════════════════════════════════════════ */
.ab-lightbox {
  position: fixed; inset: 0; z-index: 9999;
  display: flex; align-items: center; justify-content: center;
}
.ab-lightbox-bg { position: absolute; inset: 0; background: rgba(10,14,23,0.95); }
.ab-lightbox-close {
  position: absolute; top: 24px; right: 32px; z-index: 3;
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  color: rgba(255,255,255,0.6); font-size: 1.6rem;
  width: 44px; height: 44px; border-radius: 50%;
  cursor: pointer; display: flex; align-items: center; justify-content: center;
  transition: all 0.25s;
}
.ab-lightbox-close:hover { background: rgba(255,255,255,0.12); color: #fff; }
.ab-lightbox-body { position: relative; z-index: 2; max-width: 90vw; max-height: 90vh; }
.ab-lightbox-body img { max-width: 90vw; max-height: 82vh; object-fit: contain; border-radius: 8px; box-shadow: 0 20px 60px rgba(0,0,0,0.5); }
.ab-lightbox-title { margin-top: 16px; font-size: 0.85rem; font-weight: 600; color: rgba(255,255,255,0.5); text-align: center; }

/* ═══════════════════════════════════════════
   CTA
   ═══════════════════════════════════════════ */
.ab-cta {
  position: relative; padding: clamp(60px, 8vw, 100px) 0;
  background: var(--color-bg-dark); overflow: hidden;
}
.ab-cta-bg { display: none; }
.ab-cta-content { position: relative; z-index: 1; text-align: center; max-width: 560px; margin: 0 auto; }
.ab-cta-content .ab-heading-light { color: #fff; margin-bottom: 0.75rem; }
.ab-cta-content p { font-size: 0.9rem; color: rgba(255,255,255,0.4); line-height: 1.65; margin-bottom: 1.5rem; }
.ab-cta-btns { display: flex; gap: 14px; justify-content: center; flex-wrap: wrap; }
.ab-cta-btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 28px; font-size: 0.7rem; font-weight: 600;
  letter-spacing: 0.08em; text-transform: uppercase;
  border-radius: 8px; transition: all 0.3s; text-decoration: none;
}
.ab-cta-btn-primary { background: var(--color-accent); color: #fff; border: none; }
.ab-cta-btn-primary:hover { background: #d4283e; transform: translateY(-2px); box-shadow: 0 8px 24px rgba(196,30,58,0.3); }
.ab-cta-btn-outline { background: transparent; color: rgba(255,255,255,0.7); border: 1px solid rgba(255,255,255,0.12); }
.ab-cta-btn-outline:hover { border-color: var(--color-accent); background: rgba(196,30,58,0.1); color: var(--color-accent); }

/* ═══════════════════════════════════════════
   响应式
   ═══════════════════════════════════════════ */
@media (max-width: 1024px) {
  .ab-split { grid-template-columns: 1fr; }
  .ab-img-reveal img { height: 320px; }
  .ab-cred-grid { grid-template-columns: repeat(2, 1fr); }
  .ab-facility-grid { grid-template-columns: repeat(2, 1fr); }
  .ab-facility-feature img { height: 280px; }
  .ab-values-grid { grid-template-columns: repeat(2, 1fr); }
  .ab-img-strip-3 { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .ab-hero-title { font-size: clamp(1.8rem, 7vw, 2.8rem); }
  .ab-history-grid { padding-left: 20px; }
  .ab-history-grid::before { left: 10px; }
  .ab-h-item { grid-template-columns: 1fr; gap: 16px; }
  .ab-h-reverse .ab-h-image { order: -1; }
  .ab-h-reverse .ab-h-content { order: 0; text-align: left; }
  .ab-h-reverse .ab-h-content .ab-h-dot { margin-left: 0; }
  .ab-h-reverse .ab-h-content p { margin-left: 0; }
  .ab-h-item::after { left: 10px; }
  .ab-cred-grid { grid-template-columns: 1fr 1fr; }
  .ab-facility-grid { grid-template-columns: 1fr; }
  .ab-facility-feature img { height: 220px; }
  .ab-img-strip-3 { grid-template-columns: 1fr; }
  .ab-strip-img-wrap { height: 200px; }
  .ab-img-badge { bottom: -10px; right: -6px; padding: 8px 14px; }
}
@media (max-width: 480px) {
  .ab-hero-stats-row { flex-direction: column; gap: 10px; align-items: center; }
  .ab-hero-stat { border-left: none; padding: 0; }
  .ab-cred-grid { grid-template-columns: 1fr; }
}