/* ===== AnkView — Modern Light Corporate Site ===== */
:root {
  --bg: #ffffff;
  --bg-tint: #f7f8fa;
  --text: #14202c;
  --text-soft: #55636f;
  --navy: #0b2d4d;
  --navy-dark: #071f38;
  --gold: #b4831c;
  --gold-dark: #96690f;
  --accent: var(--navy);
  --accent-dark: var(--navy-dark);
  --border: #e4e8ee;
  --radius: 14px;
  --shadow: 0 10px 30px rgba(11, 45, 77, 0.08);
  --max-w: 1120px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI",
    "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 24px; }

h1, h2, h3 { line-height: 1.2; letter-spacing: -0.02em; }

h2 { font-size: clamp(1.9rem, 3.6vw, 2.8rem); font-weight: 700; }

.eyebrow {
  color: var(--gold-dark);
  font-weight: 700;
  font-size: 0.82rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 12px;
}

.accent { color: var(--gold); }

.section { padding: 120px 0; }
.section-tinted { background: var(--bg-tint); }

.section-head { max-width: 720px; margin: 0 auto 64px; text-align: center; }
.section-head p { color: var(--text-soft); margin: 12px auto 0; }

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease;
}
.site-header.scrolled { border-bottom-color: var(--border); }

.nav-wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 68px;
}

.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }
.logo-img { height: 42px; width: auto; display: block; }
.logo-text { font-weight: 800; font-size: 1.25rem; color: var(--navy); letter-spacing: -0.02em; }

.nav { display: flex; align-items: center; gap: 30px; }
.nav a {
  color: var(--text-soft);
  text-decoration: none;
  font-weight: 500;
  font-size: 0.95rem;
  transition: color 0.2s;
}
.nav a:hover { color: var(--text); }
.nav-cta {
  background: var(--accent);
  color: #fff !important;
  padding: 9px 18px;
  border-radius: 999px;
  font-weight: 600 !important;
}
.nav-cta:hover { background: var(--accent-dark); }

.nav-toggle { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.nav-toggle span {
  display: block; width: 22px; height: 2px;
  background: var(--text); margin: 5px 0; border-radius: 2px;
  transition: 0.25s;
}

/* ===== Hero ===== */
.hero {
  padding: 130px 0 48px;
  overflow: hidden;
  position: relative;
  background: #081f36;
  color: #fff;
  /* 首屏铺满：至少占满整个视口高度 */
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}
.hero-video {
  /* 视频作为 hero 区块的背景层：铺满首屏、位于所有首屏内容之下。
     不用 fixed 全页背景 —— Chrome 会把 fixed 视频合成为独立图层，
     会穿透下方白色区块浮到文字上层，导致内容看不清 */
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
  pointer-events: none;
}
.hero-shade {
  position: absolute;
  inset: 0;
  z-index: 1;
  background:
    linear-gradient(to top, rgba(5, 20, 36, 0.72) 0%, rgba(5, 20, 36, 0) 34%),
    linear-gradient(
      100deg,
      rgba(5, 20, 36, 0.95) 0%,
      rgba(7, 27, 48, 0.86) 48%,
      rgba(7, 27, 48, 0.66) 100%
    );
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent 92%);
  mask-image: linear-gradient(to bottom, rgba(0,0,0,0.9), transparent 92%);
  pointer-events: none;
}
.hero .container { position: relative; z-index: 3; }
/* 减弱动态效果时：隐藏视频动画，但保留静态海报背景 */
@media (prefers-reduced-motion: reduce) {
  .hero {
    background-color: #081f36;
    background-image: url("../assets/products/processing-capabilities.jpg");
    background-size: cover;
    background-position: center;
  }
  .hero-video { display: none; }
}
/* 视频加载失败时的静态图降级（由 JS 添加 video-failed 类） */
.hero.video-failed {
  background-color: #081f36;
  background-image: url("../assets/products/processing-capabilities.jpg");
  background-size: cover;
  background-position: center;
}
.hero.video-failed .hero-video { display: none; }
.hero-inner {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  gap: 48px;
  align-items: center;
  align-content: center;
  position: relative;
  flex: 1;
}
.hero h1 { font-size: clamp(2.1rem, 4.6vw, 3.4rem); font-weight: 800; margin-bottom: 20px; letter-spacing: -0.025em; color: #fff; }
.hero-eyebrow { display: flex; align-items: center; gap: 14px; }
.hero-eyebrow::before {
  content: "";
  width: 40px; height: 2px;
  background: var(--gold);
  flex-shrink: 0;
}
.hero .lead { color: rgba(228, 237, 245, 0.85); font-size: 1.1rem; max-width: 540px; margin-bottom: 32px; }
.page-hero .lead { color: var(--text-soft); }

.hero-actions { display: flex; gap: 14px; flex-wrap: wrap; margin-bottom: 44px; }

.btn {
  display: inline-block;
  padding: 13px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.98rem;
  text-decoration: none;
  border: 1.5px solid transparent;
  transition: 0.2s;
  cursor: pointer;
}
.btn-primary { background: var(--accent); color: #fff; }
.btn-primary:hover { background: var(--accent-dark); transform: translateY(-1px); }
.btn-outline { border-color: var(--border); color: var(--text); background: #fff; }
.btn-outline:hover { border-color: var(--accent); color: var(--accent); }
.hero .btn-primary { background: var(--gold); color: #0b2d4d; font-weight: 700; }
.hero .btn-primary:hover { background: #c9962f; transform: translateY(-1px); }
.hero .btn-outline { border-color: rgba(255, 255, 255, 0.45); color: #fff; background: transparent; }
.hero .btn-outline:hover { border-color: var(--gold); color: var(--gold); }
.btn-full { width: 100%; }

.hero-stats { display: flex; gap: 40px; }
.hero .stat strong { display: block; font-size: 1.6rem; font-weight: 800; color: #fff; }
.hero .stat span { color: rgba(228, 237, 245, 0.68); font-size: 0.85rem; }

.hero-visual { position: relative; min-height: 360px; }
.orb {
  position: absolute; border-radius: 50%;
  filter: blur(0.5px);
}
.orb-1 {
  width: 320px; height: 320px; top: 10px; right: 20px;
  background: radial-gradient(circle at 30% 30%, rgba(11, 45, 77, 0.14), rgba(11, 45, 77, 0.03));
}
.orb-2 {
  width: 200px; height: 200px; bottom: 0; left: 0;
  background: radial-gradient(circle at 60% 40%, rgba(180, 131, 28, 0.14), rgba(180, 131, 28, 0.03));
}
.hero-card {
  position: relative;
  background: rgba(9, 30, 52, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 18px;
  box-shadow: 0 18px 44px rgba(2, 12, 24, 0.45);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  padding: 26px 28px;
  max-width: 340px;
  margin: 60px auto 0;
  display: grid;
  gap: 0;
}
.hero-card-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #e0b04f;
  padding-bottom: 14px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.14);
  margin-bottom: 4px;
}
.hero-card-row {
  display: flex; align-items: center; gap: 12px;
  font-weight: 600; font-size: 0.95rem;
  color: #e9eff6;
  padding: 13px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
.hero-card-row:last-child { border-bottom: none; padding-bottom: 2px; }

/* Hero trust strip */
.hero-strip {
  position: relative;
  margin-top: 72px;
  padding-top: 26px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  display: flex;
  flex-wrap: wrap;
  gap: 14px 34px;
  justify-content: space-between;
}
.hero-strip span {
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: rgba(228, 237, 245, 0.78);
  display: flex;
  align-items: center;
  gap: 10px;
}
.hero-strip span::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--gold);
  flex-shrink: 0;
}
.dot {
  width: 9px; height: 9px; border-radius: 50%;
  background: var(--gold); flex-shrink: 0;
}

/* ===== About ===== */
.split {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 56px;
  /* 两列等高：右侧卡片列自动拉伸，与左侧文字列顶部/底部对齐 */
  align-items: stretch;
}
.split-text p { color: var(--text-soft); margin-bottom: 16px; }
.split-text strong { color: var(--text); }

.check-list { list-style: none; margin-top: 20px; display: grid; gap: 10px; }
.check-list li { padding-left: 30px; position: relative; color: var(--text); font-weight: 500; }
.check-list li::before {
  content: "✓";
  position: absolute; left: 0; top: 0;
  width: 21px; height: 21px;
  background: rgba(180, 131, 28, 0.12);
  color: var(--gold-dark);
  border-radius: 50%;
  display: grid; place-items: center;
  font-size: 0.75rem; font-weight: 700;
}

.split-cards { display: grid; gap: 18px; align-content: stretch; }
.info-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 26px;
  box-shadow: var(--shadow);
  flex: 1;
}
.info-num { color: var(--gold-dark); font-weight: 800; font-size: 0.85rem; margin-bottom: 6px; }
.info-card h3 { font-size: 1.05rem; margin-bottom: 6px; }
.info-card p { color: var(--text-soft); font-size: 0.93rem; }

/* ===== Products ===== */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 22px;
}
.product-card {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 30px 28px;
  transition: 0.25s;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: rgba(180, 131, 28, 0.45); }
.product-icon {
  font-size: 1.9rem;
  width: 56px; height: 56px;
  display: grid; place-items: center;
  background: #faf6ec;
  border-radius: 14px;
  margin-bottom: 18px;
}
.product-card h3 { font-size: 1.12rem; margin-bottom: 10px; }
.product-card > p { color: var(--text-soft); font-size: 0.93rem; margin-bottom: 14px; }
.product-card ul { list-style: none; display: grid; gap: 7px; }
.product-card li {
  font-size: 0.88rem;
  color: var(--text);
  padding-left: 18px;
  position: relative;
}
.product-card li::before {
  content: "—";
  position: absolute; left: 0;
  color: var(--gold);
}
.line-link {
  display: inline-block;
  margin-top: 16px;
  font-weight: 700;
  font-size: 0.88rem;
  color: var(--navy);
  text-decoration: none;
  border-bottom: 2px solid rgba(180, 131, 28, 0.5);
  padding-bottom: 2px;
  transition: 0.2s;
}
.line-link:hover { color: var(--gold); border-bottom-color: var(--gold); }

/* ===== Line Detail Pages ===== */
.page-hero {
  padding: 130px 0 64px;
  background:
    linear-gradient(to bottom, rgba(11, 45, 77, 0.045), rgba(255, 255, 255, 0) 70%),
    repeating-linear-gradient(0deg, transparent, transparent 39px, rgba(11, 45, 77, 0.05) 40px),
    repeating-linear-gradient(90deg, transparent, transparent 39px, rgba(11, 45, 77, 0.05) 40px);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
}
.breadcrumb {
  font-size: 0.82rem;
  color: var(--text-soft);
  margin-bottom: 18px;
}
.breadcrumb a { color: var(--text-soft); text-decoration: none; }
.breadcrumb a:hover { color: var(--gold); }
.page-hero h1 {
  font-size: clamp(1.9rem, 3.6vw, 2.7rem);
  font-weight: 800;
  margin-bottom: 14px;
}
.page-hero .lead {
  font-size: 1.05rem;
  max-width: 680px;
}
.page-banner {
  max-width: 920px;
  margin: 0 auto;
  position: relative;
}
.page-banner img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  border: 1px solid var(--border);
}
.page-banner::after {
  content: "";
  position: absolute;
  left: 50%; bottom: -14px;
  transform: translateX(-50%);
  width: 56px; height: 3px;
  background: var(--gold);
  border-radius: 2px;
}
.subcat {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 34px 34px 28px;
  box-shadow: var(--shadow);
  margin-bottom: 28px;
}
.subcat-head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 8px;
}
.subcat-head h2 { font-size: 1.25rem; margin: 0; }
.subcat-tag {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--gold);
  background: #faf6ec;
  border-radius: 6px;
  padding: 3px 10px;
}
.subcat > p { color: var(--text-soft); font-size: 0.95rem; margin-bottom: 20px; }
.spec-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.spec-table th, .spec-table td {
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}
.spec-table th {
  width: 200px;
  color: var(--navy);
  font-weight: 700;
  background: #f8fafc;
  white-space: nowrap;
}
.spec-table tr:last-child th, .spec-table tr:last-child td { border-bottom: none; }
.page-cta {
  margin-top: 20px;
  background: linear-gradient(135deg, var(--navy), #123a5e);
  border-radius: var(--radius);
  color: #fff;
  padding: 42px 40px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  flex-wrap: wrap;
}
.page-cta h2 { font-size: 1.4rem; margin-bottom: 6px; }
.page-cta p { color: rgba(255, 255, 255, 0.82); font-size: 0.95rem; }
.page-cta .btn-primary { background: var(--gold); color: #1c1403; }
.page-cta .btn-primary:hover { background: #c9971f; }

/* ===== Advantages ===== */
.adv-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 34px 28px;
}
.adv-item h3 { font-size: 1.05rem; margin-bottom: 8px; }
.adv-item p { color: var(--text-soft); font-size: 0.93rem; }

/* ===== Process ===== */
.steps {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 22px;
  counter-reset: step;
}
.step {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 22px;
}
.step span {
  display: inline-grid; place-items: center;
  width: 34px; height: 34px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-weight: 700;
  margin-bottom: 12px;
}
.step h3 { font-size: 1rem; margin-bottom: 6px; }
.step p { color: var(--text-soft); font-size: 0.87rem; }

/* ===== Contact ===== */
.contact-wrap {
  display: grid;
  grid-template-columns: 1fr 1.1fr;
  gap: 56px;
  align-items: start;
}
.contact-info p { color: var(--text-soft); margin-top: 14px; }
.contact-list { list-style: none; margin-top: 26px; display: grid; gap: 14px; }
.contact-list a { color: var(--accent); text-decoration: none; font-weight: 600; }

.contact-form {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: var(--shadow);
  padding: 34px;
  display: grid;
  gap: 18px;
}
.contact-form label { display: grid; gap: 7px; font-weight: 600; font-size: 0.88rem; }
.contact-form input,
.contact-form select,
.contact-form textarea {
  font: inherit;
  font-weight: 400;
  padding: 12px 14px;
  border: 1.5px solid var(--border);
  border-radius: 10px;
  background: var(--bg-tint);
  color: var(--text);
  outline: none;
  transition: border-color 0.2s;
  width: 100%;
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus { border-color: var(--accent); background: #fff; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-note { font-size: 0.8rem; color: var(--text-soft); text-align: center; }

/* ===== Footer ===== */
.site-footer {
  background: var(--navy);
  color: #c5d2de;
  padding: 56px 0 32px;
}
.footer-wrap { display: grid; gap: 24px; }
.footer-logo { height: 110px; width: auto; display: block; }
.footer-slogan {
  margin-top: 18px;
  display: grid;
  gap: 4px;
}
.footer-slogan .slogan-cn { color: #ffffff; font-size: 1.05rem; }
.footer-slogan .slogan-en { color: #d9b45c; }
.footer-brand p { font-size: 0.9rem; margin-top: 10px; max-width: 320px; }
.footer-links { display: flex; gap: 26px; flex-wrap: wrap; }
.footer-links a { color: #b9c4cf; text-decoration: none; font-size: 0.9rem; }
.footer-links a:hover { color: #fff; }
.copyright { font-size: 0.8rem; color: #7d8a96; border-top: 1px solid rgba(255,255,255,0.08); padding-top: 22px; }

/* ===== Slogan ===== */
.slogan {
  margin: 22px 0 6px;
  padding: 18px 24px;
  border-left: 3px solid var(--gold);
  background: #faf6ec;
  border-radius: 0 12px 12px 0;
  display: grid;
  gap: 5px;
}
.slogan-cn {
  font-weight: 700;
  color: var(--navy);
  font-size: 1.18rem;
  letter-spacing: 0.08em;
}
.slogan-en {
  color: var(--gold-dark);
  font-weight: 600;
  font-size: 0.98rem;
}

/* ===== Applications ===== */
.app-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 22px;
}
.app-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px 26px;
  transition: 0.25s;
}
a.app-link { text-decoration: none; color: inherit; display: block; cursor: pointer; }
a.app-link:hover h3 { color: var(--navy); }
.app-item:hover { border-color: rgba(180, 131, 28, 0.45); box-shadow: var(--shadow); }
.app-item h3 { font-size: 1.02rem; margin-bottom: 8px; }
.app-item p { color: var(--text-soft); font-size: 0.92rem; }

/* ===== FAQ ===== */
.faq-container { max-width: 820px; }
.faq-list { display: grid; gap: 12px; }
.faq-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 0;
  overflow: hidden;
}
.faq-item summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 1rem;
  padding: 18px 22px;
  list-style: none;
  position: relative;
  padding-right: 48px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute;
  right: 22px; top: 50%;
  transform: translateY(-50%);
  font-size: 1.3rem;
  color: var(--gold-dark);
  font-weight: 700;
  transition: transform 0.2s;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item summary:hover { color: var(--navy); }
.faq-item p {
  padding: 0 22px 18px;
  color: var(--text-soft);
  font-size: 0.94rem;
}
.faq-item p a { color: var(--navy); font-weight: 600; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero-inner, .split, .contact-wrap { grid-template-columns: 1fr; }
  .hero { padding: 72px 0 56px; }
  .hero-visual { min-height: 300px; }
  .hero-card { margin-top: 30px; }
  .hero-strip { gap: 12px 22px; justify-content: flex-start; margin-top: 48px; }
  .nav {
    position: fixed;
    top: 68px; left: 0; right: 0;
    background: #fff;
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px 26px;
    gap: 18px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-130%);
    transition: transform 0.3s ease;
    box-shadow: var(--shadow);
  }
  .nav.open { transform: translateY(0); }
  .nav-toggle { display: block; }
}
@media (max-width: 560px) {
  .section { padding: 64px 0; }
  .hero-stats { gap: 24px; flex-wrap: wrap; }
  .form-row { grid-template-columns: 1fr; }
  .contact-form { padding: 24px; }
  .page-hero { padding: 110px 0 48px; }
  .subcat { padding: 24px 20px 20px; }
  .spec-table th, .spec-table td { padding: 8px 10px; }
  .spec-table th { width: 130px; white-space: normal; }
}

/* =====================================================
   v4 — Apple-style homepage refinement
   居中大字 hero · 图片化卡片 · 滚动渐显
   ===================================================== */

/* ---- Hero: centered ---- */
.hero-center .hero-inner {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  max-width: 880px;
  margin: 0 auto;
  width: 100%;
}
.hero-center .hero-eyebrow { justify-content: center; letter-spacing: 0.18em; }
.hero-center .hero-eyebrow::before { display: none; }
.hero-center h1 { font-size: clamp(2.5rem, 6vw, 4.3rem); letter-spacing: -0.03em; }
.hero-center .lead { margin-left: auto; margin-right: auto; font-size: 1.15rem; max-width: 640px; }
.hero-center .hero-actions { justify-content: center; }
.hero-center .hero-stats { justify-content: center; gap: 56px; }
.hero-center .hero-strip { justify-content: center; gap: 14px 36px; margin-top: 60px; }

/* ---- Products: image cards ---- */
.prod-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
}
.prod-card {
  display: block;
  background: #fff;
  border-radius: 22px;
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--border);
  box-shadow: 0 2px 10px rgba(11, 45, 77, 0.05);
  transition: transform 0.35s ease, box-shadow 0.35s ease, border-color 0.35s ease;
}
.prod-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 24px 48px rgba(11, 45, 77, 0.14);
  border-color: rgba(180, 131, 28, 0.4);
}
.prod-media { aspect-ratio: 16 / 9; overflow: hidden; }
.prod-media img {
  width: 100%; height: 100%;
  object-fit: cover; display: block;
  transition: transform 0.6s ease;
}
.prod-card:hover .prod-media img { transform: scale(1.05); }
.prod-body { padding: 28px 30px 32px; }
.prod-body h3 { font-size: 1.35rem; margin-bottom: 8px; color: var(--navy); }
.prod-body > p { color: var(--text-soft); margin-bottom: 14px; font-size: 0.97rem; }
.prod-specs { list-style: none; display: grid; gap: 6px; margin-bottom: 20px; }
.prod-specs li { font-size: 0.88rem; color: var(--text); padding-left: 18px; position: relative; }
.prod-specs li::before { content: "—"; position: absolute; left: 0; color: var(--gold); }
.prod-card .line-link { margin-top: 0; }

/* ---- Applications: image cards ---- */
.app-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.app-card {
  position: relative;
  display: block;
  aspect-ratio: 4 / 3;
  border-radius: 22px;
  overflow: hidden;
  text-decoration: none;
  background: var(--navy);
}
.app-card img {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}
.app-card:hover img { transform: scale(1.06); }
.app-card::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(to top, rgba(5, 20, 36, 0.88) 0%, rgba(5, 20, 36, 0.2) 55%, rgba(5, 20, 36, 0) 78%);
}
.app-card-body {
  position: absolute; left: 0; right: 0; bottom: 0;
  z-index: 1;
  padding: 22px 24px;
  color: #fff;
}
.app-card-body h3 { font-size: 1.12rem; margin-bottom: 4px; }
.app-card-body p { font-size: 0.86rem; color: rgba(255, 255, 255, 0.85); }

/* ---- Advantages: cleaner cards ---- */
.adv-grid { gap: 24px; }
.adv-item {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 22px;
  padding: 34px 32px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.adv-item:hover { transform: translateY(-4px); box-shadow: 0 18px 40px rgba(11, 45, 77, 0.1); }
.adv-item h3 { font-size: 1.15rem; margin-bottom: 10px; color: var(--navy); }
.adv-item p { font-size: 0.94rem; }

/* ---- Steps: lighter ---- */
.steps { gap: 20px; }
.step { border-radius: 22px; border-color: var(--border); }
.step span { background: var(--gold); }

/* ---- Scroll reveal ---- */
/* 隐藏态仅在 html.js 下生效（该类由 main.js 在渐显逻辑启动时添加）。
   若 main.js 未加载/是旧缓存，内容直接可见，绝不出现空白页 */
.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.8s cubic-bezier(0.2, 0.6, 0.2, 1), transform 0.8s cubic-bezier(0.2, 0.6, 0.2, 1);
  will-change: opacity, transform;
}
.js .reveal.in-view { opacity: 1; transform: none; }
.prod-grid > .reveal:nth-child(2), .app-cards > .reveal:nth-child(2),
.adv-grid > .reveal:nth-child(2), .steps > .reveal:nth-child(2) { transition-delay: 0.1s; }
.prod-grid > .reveal:nth-child(3), .app-cards > .reveal:nth-child(3),
.adv-grid > .reveal:nth-child(3), .steps > .reveal:nth-child(3) { transition-delay: 0.2s; }
.prod-grid > .reveal:nth-child(4), .app-cards > .reveal:nth-child(4),
.adv-grid > .reveal:nth-child(4), .steps > .reveal:nth-child(4) { transition-delay: 0.3s; }
.app-cards > .reveal:nth-child(5) { transition-delay: 0.15s; }
.app-cards > .reveal:nth-child(6) { transition-delay: 0.25s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

/* ---- v4 responsive ---- */
@media (max-width: 900px) {
  .app-cards { grid-template-columns: repeat(2, 1fr); }
  .hero-center .hero-stats { gap: 32px; }
}
@media (max-width: 760px) {
  .prod-grid { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .section { padding: 72px 0; }
  .section-head { margin-bottom: 44px; }
  .app-cards { grid-template-columns: 1fr; }
  .app-card { aspect-ratio: 16 / 10; }
}