/* ===== 合乐电子 - 主样式 ===== */
:root {
  --primary: #0d6efd;
  --primary-dark: #0a58ca;
  --accent: #00d4ff;
  --dark: #0a0e17;
  --dark2: #111827;
  --dark3: #1a2332;
  --text: #e8edf5;
  --text2: #94a3b8;
  --card-bg: rgba(255,255,255,0.03);
  --card-border: rgba(255,255,255,0.06);
  --radius: 12px;
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, 'Noto Sans SC', sans-serif;
  background: var(--dark);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Navigation ===== */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(10,14,23,0.65);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(255,255,255,0.05);
  transition: var(--transition);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  color: var(--text);
  font-size: 1.2rem;
  font-weight: 700;
}

.logo-icon {
  font-size: 1.5rem;
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 8px;
  align-items: center;
}

.nav-menu a {
  text-decoration: none;
  color: var(--text2);
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  transition: var(--transition);
  position: relative;
}

.nav-menu a:hover, .nav-menu a.active {
  color: var(--text);
  background: rgba(255,255,255,0.06);
}

.lang-switch {
  font-weight: 600;
  color: var(--accent) !important;
  border: 1px solid rgba(0,212,255,0.3);
}

.lang-switch:hover {
  background: rgba(0,212,255,0.1) !important;
  border-color: var(--accent);
}

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== Hero Section ===== */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  overflow: hidden;
  padding: 80px 20px;
}

.hero-bg {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse at 20% 50%, rgba(13,110,253,0.15) 0%, transparent 50%),
    radial-gradient(ellipse at 80% 20%, rgba(0,212,255,0.1) 0%, transparent 50%),
    radial-gradient(ellipse at 50% 80%, rgba(99,102,241,0.08) 0%, transparent 50%);
}

.particles {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}

.hero-title {
  font-size: clamp(2rem, 5vw, 3.5rem);
  font-weight: 800;
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 0%, var(--accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1.2;
}

.hero-subtitle {
  font-size: clamp(1rem, 2vw, 1.2rem);
  color: var(--text2);
  margin-bottom: 40px;
}

.hero-cta {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

.hero-trust {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.hero-trust span {
  min-height: 34px;
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border: 1px solid rgba(255,255,255,0.12);
  border-radius: 8px;
  background: rgba(255,255,255,0.06);
  color: var(--text);
  font-size: 0.82rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 14px 32px;
  border-radius: 50px;
  font-size: 1rem;
  font-weight: 600;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: none;
  gap: 8px;
}

.btn-primary {
  background: linear-gradient(135deg, var(--primary), #4a6cf7);
  color: #fff;
  box-shadow: 0 4px 20px rgba(13,110,253,0.3);
}

/* ===== Docs ===== */
.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  justify-content: center;
}

.tag-pill {
  display: inline-flex;
  align-items: center;
  padding: 6px 12px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,0.14);
  background: rgba(255,255,255,0.06);
  color: rgba(255,255,255,0.9);
  text-decoration: none;
  font-size: 0.82rem;
  transition: var(--transition);
}

.tag-pill:hover {
  border-color: rgba(0,212,255,0.45);
  color: var(--accent);
  background: rgba(0,212,255,0.06);
}

.docs-article-section {
  max-width: 1200px;
  margin: 0 auto;
}

.docs-article-body {
  max-width: 900px;
  margin: 0 auto;
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(13,110,253,0.4);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid rgba(255,255,255,0.2);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,212,255,0.06);
}

.btn-sm {
  padding: 10px 20px;
  font-size: 0.85rem;
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  animation: bounce 2s infinite;
}

.scroll-indicator span {
  display: block;
  width: 20px;
  height: 20px;
  border-right: 2px solid var(--text2);
  border-bottom: 2px solid var(--text2);
  transform: rotate(45deg);
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(10px); }
}

/* ===== Sections ===== */
.section {
  padding: 100px 0;
}

.section-title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 700;
  text-align: center;
  margin-bottom: 16px;
}

.section-desc {
  text-align: center;
  color: var(--text2);
  max-width: 600px;
  margin: 0 auto 60px;
  font-size: 1.05rem;
}

.section:nth-child(even) {
  background: var(--dark2);
}

/* ===== Trust ===== */
.trust-section {
  padding: 34px 0;
  background: #0e1522;
  border-top: 1px solid rgba(255,255,255,0.06);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 16px;
}

.trust-item {
  min-height: 86px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  padding: 18px;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: rgba(255,255,255,0.03);
}

.trust-item strong {
  color: #fff;
  font-size: 1.1rem;
}

.trust-item span {
  color: var(--text2);
  font-size: 0.86rem;
}

/* ===== About ===== */
.about-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 24px;
}

.about-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}

.about-card:hover {
  transform: translateY(-4px);
  border-color: rgba(13,110,253,0.3);
  box-shadow: 0 8px 40px rgba(0,0,0,0.3);
}

.about-icon {
  font-size: 2rem;
  margin-bottom: 16px;
}

.about-card h3 {
  margin-bottom: 12px;
  font-size: 1.1rem;
}

.about-card p {
  color: var(--text2);
  font-size: 0.9rem;
  line-height: 1.7;
}

/* ===== Products ===== */
.products {
  background: var(--dark2);
}

.products-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}
@media (min-width: 920px) {
  .products-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

.product-card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 18px;
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
  overflow: hidden;
  display: flex;
  gap: 18px;
  align-items: center;
  position: relative;
}

.product-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0,212,255,0.3);
  box-shadow: 0 12px 40px rgba(0,0,0,0.4);
}

.product-img {
  width: 170px;
  height: 140px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  flex-shrink: 0;
}

.product-card h3 {
  padding: 0;
  font-size: 1.05rem;
  margin: 0 0 6px;
}

.product-card p {
  padding: 0;
  margin: 0 0 10px;
  color: var(--text2);
  font-size: 0.9rem;
}

.product-body { flex: 1; min-width: 0; }
.product-app { color: rgba(255,255,255,.78); font-size: .86rem; margin-top: 2px; }
.product-tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 10px; }
.product-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 10px;
  border-radius: 999px;
  border: 1px solid rgba(255,255,255,.14);
  background: rgba(255,255,255,.06);
  color: rgba(255,255,255,.86);
  font-size: .78rem;
  text-decoration: none;
}
.product-tag:hover { border-color: rgba(0,212,255,.45); color: var(--accent); background: rgba(0,212,255,.06); }

.product-quote {
  position: absolute;
  right: 18px;
  bottom: 18px;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .2s, transform .2s;
  pointer-events: none;
}
.product-card:hover .product-quote {
  opacity: 1;
  transform: translateY(0);
  pointer-events: auto;
}
.product-quote a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--primary), #4a6cf7);
  color: #fff;
  text-decoration: none;
  font-weight: 600;
  font-size: .86rem;
  box-shadow: 0 6px 20px rgba(13,110,253,.28);
}
.product-quote a:hover { box-shadow: 0 10px 26px rgba(13,110,253,.38); }

.product-img.accent-strong-blue { background: #102a52; box-shadow: inset 0 0 0 1px rgba(0,212,255,.25); }
.product-img.accent-strong-gold { background: #35240c; box-shadow: inset 0 0 0 1px rgba(255,196,55,.25); }
.product-img.accent-muted { background: #15212f; box-shadow: inset 0 0 0 1px rgba(255,255,255,.10); }

.products-why {
  margin-top: 26px;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}
.why-card {
  background: rgba(255,255,255,.03);
  border: 1px solid rgba(255,255,255,.06);
  border-radius: 10px;
  padding: 18px;
}
.why-card strong { display: block; margin-bottom: 8px; font-size: 1rem; color: rgba(255,255,255,.92); }
.why-card span { color: var(--text2); font-size: .88rem; line-height: 1.6; }

/* ===== Equipment ===== */
.eq-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 16px;
}

.eq-item {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
  padding: 24px 16px;
  text-align: center;
  transition: var(--transition);
}

.eq-item:hover {
  border-color: rgba(13,110,253,0.3);
  background: rgba(13,110,253,0.04);
}

.eq-icon {
  font-size: 2rem;
  margin-bottom: 12px;
}

.eq-item h4, .eq-item .eq-title {
  font-size: 0.9rem;
  font-weight: 500;
}

/* ===== Solutions ===== */
.solutions {
  background: var(--dark2);
}

.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}

.solution-item {
  min-height: 132px;
  padding: 22px;
  border: 1px solid var(--card-border);
  border-radius: 8px;
  background: var(--card-bg);
  transition: var(--transition);
}

.solution-item:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,0.3);
}

.solution-item h3 {
  margin-bottom: 10px;
  font-size: 1rem;
}

.solution-item p {
  color: var(--text2);
  font-size: 0.88rem;
}

/* ===== Contact ===== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: center;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px;
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: var(--radius);
}

.ci-icon {
  font-size: 1.5rem;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: rgba(13,110,253,0.1);
  border-radius: 12px;
  flex-shrink: 0;
}

.contact-item strong {
  font-size: 0.85rem;
  color: var(--text2);
}

.contact-item p {
  color: var(--text);
  margin-top: 2px;
}

.contact-item a {
  color: var(--accent);
  text-decoration: none;
}

.contact-cta {
  background: linear-gradient(135deg, rgba(13,110,253,0.1), rgba(0,212,255,0.05));
  border: 1px solid rgba(13,110,253,0.2);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
}

.contact-cta h3 {
  margin-bottom: 12px;
  font-size: 1.3rem;
}

.contact-cta p {
  color: var(--text2);
  margin-bottom: 24px;
}

/* ===== Footer ===== */
.footer {
  border-top: 1px solid rgba(255,255,255,0.05);
  padding: 60px 0 30px;
}

.footer-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 20px;
  margin-bottom: 40px;
}

.footer-brand strong {
  display: block;
  margin-top: 8px;
  font-size: 1.1rem;
}

.footer-brand p {
  color: var(--text2);
  font-size: 0.85rem;
  margin-top: 4px;
}

.footer-links {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.footer-links a {
  color: var(--text2);
  text-decoration: none;
  font-size: 0.9rem;
  transition: var(--transition);
}

.footer-links a:hover {
  color: var(--accent);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.05);
  color: var(--text2);
  font-size: 0.8rem;
}

.footer-bottom a {
  color: var(--text2);
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .nav-toggle { display: flex; }

  .nav-menu {
    position: fixed;
    top: 64px;
    left: 0;
    right: 0;
    background: rgba(10,14,23,0.98);
    flex-direction: column;
    padding: 20px;
    gap: 4px;
    transform: translateY(-100%);
    opacity: 0;
    transition: var(--transition);
    pointer-events: none;
  }

  .nav-menu.active {
    transform: translateY(0);
    opacity: 1;
    pointer-events: all;
  }

  .nav-menu a {
    padding: 14px 16px;
    width: 100%;
    font-size: 1rem;
  }

  .contact-grid {
    grid-template-columns: 1fr;
  }

  .trust-grid {
    grid-template-columns: repeat(2, 1fr);
  }


  .products-grid {
    grid-template-columns: 1fr;
  }

  .about-grid {
    grid-template-columns: 1fr;
  }

  .section {
    padding: 60px 0;
  }

  .hero-title {
    font-size: 1.8rem;
  }
}
@media (max-width: 920px) {
  .products-why { grid-template-columns: 1fr; }
}

@media (max-width: 520px) {
  .trust-grid {
    grid-template-columns: 1fr;
  }

  .hero-trust {
    justify-content: flex-start;
  }
}

/* SVG 图标样式 */
.img-swap { position: relative; width: 140px; height: 140px; margin: 0 auto; }
.img-swap .img-detail { position: absolute; top: 0; left: 0; width: 140px; height: 140px; opacity: 0; transition: opacity .3s; }
.img-swap .img-overview { width: 140px; height: 140px; }
.img-swap img { width: 100%; height: 100%; object-fit: contain; display: block; }
.product-card:hover .img-swap .img-detail { opacity: 1; }
.product-card:hover .img-swap .img-overview { opacity: 0; }
.product-overlay { position: absolute; bottom: 4px; left: 50%; transform: translateX(-50%); font-size: .65rem; color: rgba(255,255,255,.7); background: rgba(0,0,0,.45); padding: 2px 8px; border-radius: 8px; white-space: nowrap; }
.product-card:hover .product-overlay { opacity: 0; }
.eq-icon { position: relative; display: flex; align-items: center; justify-content: center; width: 100%; min-height: 100px; }
.eq-overlay { position: absolute; bottom: 0; left: 50%; transform: translateX(-50%); font-size: .7rem; color: rgba(255,255,255,.8); background: rgba(0,0,0,.5); padding: 2px 8px; border-radius: 8px; white-space: nowrap; opacity: 0; transition: opacity .2s; }
.eq-item:hover .eq-overlay { opacity: 1; }


/* Hero 视频背景 */
.hero-current {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
  z-index: 0;
}
.hero-pcb-bg {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(90deg, rgba(5,8,14,.92) 0%, rgba(5,8,14,.48) 38%, rgba(5,8,14,.10) 100%);
  background-position: center;
  background-size: cover;
  background-repeat: no-repeat;
  transition: opacity .5s ease;
}
.hero-pcb-bg.is-loaded {
  opacity: 1;
}
.hero-current-svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  -webkit-mask: url("../img/hero/pcb-current-mask.png") center / cover no-repeat;
  mask: url("../img/hero/pcb-current-mask.png") center / cover no-repeat;
  mix-blend-mode: screen;
}
.hero-current-path {
  fill: none;
  stroke: rgba(255,255,255,.98);
  stroke-width: 12;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 58 620;
  stroke-dashoffset: 0;
  filter: url(#heroCurrentGlow);
  animation: heroCurrentRun 3.1s linear infinite;
}
.hero-current-path.thin {
  stroke-width: 8;
  stroke-dasharray: 42 520;
}
.hero-current-path.slow { animation-duration: 4.45s; }
.hero-current-path.delay-1 { animation-delay: -.55s; }
.hero-current-path.delay-2 { animation-delay: -1.15s; }
.hero-current-path.delay-3 { animation-delay: -1.8s; }
.hero-current-path.delay-4 { animation-delay: -2.45s; }
.hero-current-spark {
  fill: #fff;
  filter: url(#heroSparkGlow);
  opacity: .92;
}
@keyframes heroCurrentRun {
  to { stroke-dashoffset: -678; }
}
@media (max-width: 760px) {
  .hero-pcb-bg { background-position: 62% center; }
  .hero-current-svg {
    -webkit-mask-position: 62% center;
    mask-position: 62% center;
  }
}
/* ===== 文档中心相关指南 ===== */
.product-guide {
  margin-top: 8px;
  text-align: center;
  min-height: 26px;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity .2s, transform .2s;
}
.product-card:hover .product-guide, .product-card:focus-within .product-guide {
  opacity: 1;
  transform: translateY(0);
}
.guide-link {
  display: inline-block;
  font-size: .78rem;
  color: var(--primary, #0d6efd);
  text-decoration: none;
  padding: 4px 12px;
  border-radius: 10px;
  background: rgba(13,110,253,.08);
  transition: background .2s;
}
.guide-link:hover {
  background: rgba(13,110,253,.18);
}

/* ===== Capability update ===== */
.solution-diagram-grid .solution-item { min-height: 230px; }
.board-stack { margin-top: 18px; display: flex; flex-direction: column; gap: 4px; padding: 12px; border-radius: 8px; background: rgba(255,255,255,.04); border: 1px solid var(--card-border); }
.board-stack span { display: block; height: 18px; border-radius: 3px; text-align: center; font-size: .7rem; line-height: 18px; color: rgba(255,255,255,.86); background: #2b3948; }
.board-stack.heavy span:nth-child(2), .board-stack.heavy span:nth-child(4) { height: 26px; background: #b66a2a; }
.board-stack.signal span:nth-child(1), .board-stack.signal span:nth-child(5) { background: #3977b8; }
.board-stack.signal span:nth-child(2) { background: #344c38; }
.board-stack.vehicle span:nth-child(2), .board-stack.vehicle span:nth-child(4) { background: #9b6b2f; }
.board-stack.medical span:nth-child(1) { background: #c8a855; color: #1a1a1a; }
.capability-grid { display: grid; grid-template-columns: 1.2fr .8fr; gap: 24px; align-items: stretch; }
.capability-table-wrap, .factory-proof { background: var(--card-bg); border: 1px solid var(--card-border); border-radius: var(--radius); padding: 22px; }
.capability-table { width: 100%; border-collapse: collapse; font-size: .92rem; }
.capability-table th, .capability-table td { padding: 12px 10px; border-bottom: 1px solid var(--card-border); text-align: left; }
.capability-table th { color: var(--text2); width: 34%; font-weight: 600; }
.capability-table tr:last-child th, .capability-table tr:last-child td { border-bottom: 0; }
.factory-proof { display: grid; gap: 14px; }
.proof-card { border: 1px solid var(--card-border); border-radius: 8px; padding: 18px; background: rgba(13,110,253,.05); }
.proof-card strong { display: block; font-size: 1.1rem; margin-bottom: 6px; color: var(--accent); }
.proof-card span { color: var(--text2); font-size: .88rem; }
@media (max-width: 768px) { .capability-grid { grid-template-columns: 1fr; } .product-guide { opacity: 1; transform: none; } }