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

:root {
  /* ===== Brand Color Palette — unified blue scale ===== */
  --blue:    #1A6ACE;   /* primary brand blue  */
  --blue-rgb: 26,106,206; /* for rgba() usage */
  --blue-d:  #1457B8;   /* dark hover          */
  --blue-l:  #E0EBFF;   /* light tint / badge  */
  --orange:  #F6993F;
  --dark:    #1A2332;
  --gray:    #2D3748;
  --text:    #4A5568;
  --border:  #E2E8F0;
  --bg:      #F7FAFC;
  --white:   #FFFFFF;
}

html { scroll-behavior: smooth; }
body { font-family: 'Inter', sans-serif; color: var(--gray); background: var(--white); line-height: 1.6; }

/* ===== NAV ===== */
nav {
  position: fixed; top: 0; width: 100%; z-index: 999;
  background: rgba(26,35,50,0.97);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.nav-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 32px; height: 68px;
}
.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; color: #fff; }
.logo-svg {
  width: 40px; height: 40px;
  flex-shrink: 0;
}
.logo-text { font-family: 'Montserrat', sans-serif; font-weight: 700; font-size: 18px; }
.logo-sub { font-size: 10px; color: rgba(255,255,255,0.5); letter-spacing: 1px; text-transform: uppercase; }
.nav-links { display: flex; align-items: center; gap: 6px; list-style: none; }
.nav-links a {
  color: rgba(255,255,255,0.8); text-decoration: none;
  padding: 8px 14px; border-radius: 6px; font-size: 14px; font-weight: 500;
  transition: color .2s, background .2s;
}
.nav-links a:hover { color: #fff; background: rgba(255,255,255,0.08); }
.nav-cta { background: var(--blue) !important; color: #fff !important; padding: 8px 20px !important; }
.nav-cta:hover { background: var(--blue-d) !important; }
.hamburger { display: none; cursor: pointer; color: #fff; font-size: 24px; }
.mobile-menu {
  display: none; flex-direction: column; background: rgba(26,35,50,0.99);
  padding: 16px 24px 24px;
}
.mobile-menu.open { display: flex; }
.mobile-menu a {
  color: rgba(255,255,255,0.8); text-decoration: none;
  padding: 12px 0; font-size: 15px; border-bottom: 1px solid rgba(255,255,255,0.08);
}

/* ===== HERO ===== */
.hero {
  min-height: auto;
  padding: 120px 0 40px;
  background: linear-gradient(135deg, #0D1B2E 0%, #1A2F4E 50%, #0D1B2E 100%);
  display: flex; align-items: stretch; position: relative; overflow: hidden;
}
.hero-glow {
  position: absolute; top: 20%; right: 10%;
  width: 500px; height: 500px;
  background: radial-gradient(circle, rgba(26,106,206,0.25) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero-inner {
  max-width: 1280px; margin: 0 auto; padding: 0 32px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: start;
  position: relative; z-index: 1;
}
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: rgba(26,106,206,0.18); border: 1px solid rgba(26,106,206,0.45);
  color: #93C5FD; padding: 6px 16px; border-radius: 100px;
  font-size: 12px; font-weight: 600; letter-spacing: 0.8px; text-transform: uppercase; margin-bottom: 24px;
}
.hero h1 {
  font-family: 'Montserrat', sans-serif; font-size: 50px; font-weight: 800;
  line-height: 1.15; color: #fff; margin-bottom: 20px;
}
.hero h1 span { color: var(--orange); }
.hero p { font-size: 17px; color: rgba(255,255,255,0.72); line-height: 1.7; margin-bottom: 36px; }
.hero-btns { display: flex; gap: 16px; flex-wrap: wrap; }
.btn-primary {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--blue); color: #fff; padding: 14px 32px; border-radius: 8px;
  text-decoration: none; font-weight: 600; font-size: 15px;
  transition: background .2s, transform .15s;
}
.btn-primary:hover { background: var(--blue-d); transform: translateY(-1px); }
.btn-outline {
  display: inline-flex; align-items: center; gap: 8px;
  border: 1px solid rgba(255,255,255,0.3); color: rgba(255,255,255,0.85);
  padding: 14px 28px; border-radius: 8px; text-decoration: none; font-weight: 500; font-size: 15px;
  transition: border-color .2s, background .2s;
}
.btn-outline:hover { border-color: rgba(255,255,255,0.6); background: rgba(255,255,255,0.06); }
.hero-stats { display: flex; gap: 32px; margin-top: 48px; }
.stat { border-left: 2px solid var(--blue); padding-left: 16px; }
.stat-num { font-family: 'Montserrat', sans-serif; font-size: 28px; font-weight: 700; color: #fff; }
.stat-label { font-size: 12px; color: rgba(255,255,255,0.5); text-transform: uppercase; letter-spacing: 0.8px; }

/* ===== HERO VISUAL - Motor Protection Showcase ===== */
.hero-visual {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

/* 电机防护整体方案展示 */
.diagram-section {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 12px;
  padding: 12px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.15);
}

.diagram-img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 8px;
}

/* ===== 轮播样式 ===== */
.carousel {
  position: relative;
  width: 100%;
}

.carousel-track {
  position: relative;
  width: 100%;
  aspect-ratio: 2364 / 2000; /* 按图片实际尺寸比例 */
  overflow: hidden;
  border-radius: 8px;
}

.carousel-slide {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  transform: translateX(100%);
  transition: all 0.5s ease-in-out;
}

.carousel-slide.active {
  opacity: 1;
  transform: translateX(0);
  z-index: 1;
}

.carousel-slide img {
  width: 100%;
  height: 100%;
  object-fit: cover; /* 统一尺寸，裁剪填充 */
  display: block;
  border-radius: 8px;
}

/* 轮播指示器 */
.carousel-indicators {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 12px;
}

.indicator {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: rgba(var(--blue-rgb), 0.3);
  cursor: pointer;
  transition: all 0.3s ease;
}

.indicator.active {
  background: #1A6ACE;
  transform: scale(1.2);
}

.indicator:hover {
  background: rgba(26,106,206,0.6);
}

/* ===== 透明PNG产品图样式 ===== */
/* 透明背景的PNG产品图，自动融入页面背景色 */
.png-product {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  /* 柔和阴影，让产品图有立体感 */
  filter: drop-shadow(0 4px 12px rgba(0, 0, 0, 0.12));
  transition: filter 0.3s ease, transform 0.3s ease;
}

.png-product:hover {
  filter: drop-shadow(0 8px 20px rgba(0, 0, 0, 0.18));
  transform: scale(1.02);
}

/* 产品图展示区域 - 透明背景，与页面融合 */
.product-img-container {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 20px;
  /* 不设背景色，让透明PNG自然融入 */
}

/* 三大核心产品展示 */
.product-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
}

.product-card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: 8px;
  overflow: hidden;
  text-decoration: none;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.product-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 4px 12px rgba(var(--blue-rgb), 0.2);
}

.product-card img {
  width: 100%;
  aspect-ratio: 16/9;
  object-fit: contain;
  display: block;
  /* 透明背景，PNG图片自然融入卡片背景 */
  background: transparent;
  padding: 8px;
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.1));
}

.product-name {
  padding: 6px 8px;
  font-size: 11px;
  font-weight: 600;
  color: #333;
  text-align: center;
  background: #fff;
  line-height: 1.3;
}
}

/* 响应式 */

/* 当page-header只有左侧内容时（无右侧图片） */
.page-header .container:not(:has(> div:last-child img)) {
  max-width: 800px;
}@media (max-width: 768px) {
  .product-grid {
    gap: 8px;
  }
  .product-name {
    font-size: 10px;
    padding: 6px;
  }
}

/* 响应式调整 */
@media (max-width: 1024px) {
  .hero-visual {
    gap: 16px;
  }
  .product-showcase {
    gap: 10px;
  }
}


/* 当page-header只有左侧内容时（无右侧图片） */
.page-header .container:not(:has(> div:last-child img)) {
  max-width: 800px;
}@media (max-width: 768px) {
  .product-showcase {
    grid-template-columns: repeat(3, 1fr);
    gap: 8px;
  }
  .showcase-info {
    padding: 8px;
  }
  .showcase-info h4 {
    font-size: 10px;
  }
}

/* 移除不再需要的动画 */
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.2); opacity: 0.7; }
}

/* ===== TRUST BAR ===== */
.trust-bar { background: var(--dark); padding: 22px 32px; }
.trust-inner {
  max-width: 1280px; margin: 0 auto;
  display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap;
}
.trust-item { display: flex; align-items: center; gap: 10px; color: rgba(255,255,255,0.65); font-size: 13px; font-weight: 500; }

/* ===== SECTIONS COMMON ===== */
section { padding: 72px 32px; }
.container { max-width: 1280px; margin: 0 auto; }
.section-label { font-size: 12px; font-weight: 700; letter-spacing: 1.5px; text-transform: uppercase; color: var(--blue); margin-bottom: 10px; }
.section-title { font-family: 'Montserrat', sans-serif; font-size: 36px; font-weight: 700; color: var(--dark); line-height: 1.2; margin-bottom: 12px; }
.section-sub { font-size: 17px; color: var(--text); line-height: 1.7; }
.section-header { margin-bottom: 24px; }
.section-header.center { text-align: center; }
.section-header.center .section-sub { margin: 0 auto; max-width: 640px; }

/* ===== PRODUCTS ===== */
#products { background: var(--bg); }
.products-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 28px; }
.product-card {
  background: var(--white); border: 1px solid var(--border); border-radius: 16px; overflow: hidden;
  transition: transform .25s, box-shadow .25s, border-color .25s;
}
.product-card:hover { transform: translateY(-6px); box-shadow: 0 20px 48px rgba(26,106,206,.12); border-color: var(--blue); }
.product-img {
  aspect-ratio: 16/10;
  display: flex; align-items: center; justify-content: center;
  background: transparent;
  overflow: hidden;
}
.product-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s ease;
  filter: drop-shadow(0 4px 12px rgba(26,106,206,0.12));
}
.product-card:hover .product-img img {
  transform: scale(1.05);
}
.product-body { padding: 28px; }
.product-tag {
  display: inline-block; background: var(--blue-l); color: var(--blue);
  font-size: 11px; font-weight: 700; padding: 3px 10px; border-radius: 4px;
  letter-spacing: 0.5px; text-transform: uppercase; margin-bottom: 14px;
}
.product-body h3 { font-family: 'Montserrat', sans-serif; font-size: 19px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.product-body p { font-size: 14px; color: var(--text); line-height: 1.65; margin-bottom: 20px; }
.product-specs { margin-bottom: 20px; }
.product-specs li {
  display: flex; align-items: flex-start; gap: 8px; font-size: 13px; color: var(--text);
  padding: 5px 0; border-bottom: 1px solid var(--border); list-style: none;
}
.product-specs li:last-child { border-bottom: none; }
.product-specs li::before { content: '✓'; color: var(--blue); font-weight: 700; flex-shrink: 0; margin-top: 1px; }
.product-link {
  display: inline-flex; align-items: center; gap: 6px; color: var(--blue);
  text-decoration: none; font-size: 14px; font-weight: 600; transition: gap .2s;
}
.product-link:hover { gap: 10px; }

/* ===== SOLUTIONS ===== */
#solutions { background: var(--white); }
.solutions-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 24px; }
.solution-card {
  border: 1px solid var(--border); border-radius: 14px; padding: 28px 24px;
  transition: transform .2s, border-color .2s, box-shadow .2s;
}
.solution-card:hover { transform: translateY(-4px); border-color: var(--blue); box-shadow: 0 8px 32px rgba(26,106,206,.12); }
.solution-icon { font-size: 36px; margin-bottom: 16px; }
.solution-card h3 { font-family: 'Montserrat', sans-serif; font-size: 17px; font-weight: 700; color: var(--dark); margin-bottom: 10px; }
.solution-card p { font-size: 14px; color: var(--text); line-height: 1.65; }
.solution-products { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.sol-tag { font-size: 11px; font-weight: 600; background: var(--bg); color: var(--gray); padding: 3px 10px; border-radius: 100px; border: 1px solid var(--border); }

/* ===== WHY US ===== */
#why { background: linear-gradient(135deg, #0D1B2E 0%, #1A2F4E 100%); }
#why .section-title { color: #fff; }
#why .section-sub { color: rgba(255,255,255,0.65); }
#why .section-label { color: #60A5FA; }
.why-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 24px; }
.why-card {
  background: rgba(255,255,255,0.06); border: 1px solid rgba(255,255,255,0.1);
  border-radius: 16px; padding: 32px 24px; transition: border-color .2s, transform .2s;
}
.why-card:hover { border-color: rgba(var(--blue-rgb), 0.5); transform: translateY(-4px); }
.why-num { font-family: 'Montserrat', sans-serif; font-size: 40px; font-weight: 800; color: var(--blue); line-height: 1; margin-bottom: 12px; }
.why-card h3 { font-size: 15px; font-weight: 600; color: #fff; margin-bottom: 8px; }
.why-card p { font-size: 13px; color: rgba(255,255,255,0.55); line-height: 1.6; }

/* ===== CERTS ===== */
#certs { background: var(--bg); }
.certs-grid { display: grid; grid-template-columns: repeat(5,1fr); gap: 20px; }
.cert-card {
  background: var(--white); border: 1px solid var(--border); border-radius: 12px; padding: 28px 20px;
  display: flex; flex-direction: column; align-items: center; text-align: center; transition: box-shadow .2s;
}
.cert-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,.08); }
.cert-icon { font-size: 36px; margin-bottom: 12px; }
.cert-card h4 { font-size: 14px; font-weight: 700; color: var(--dark); margin-bottom: 4px; }
.cert-card p { font-size: 12px; color: var(--text); }

/* ===== CTA ===== */
.cta-banner { background: linear-gradient(135deg, var(--blue) 0%, var(--blue-d) 100%); padding: 72px 32px; text-align: center; }
.cta-banner h2 { font-family: 'Montserrat', sans-serif; font-size: 32px; font-weight: 700; color: #fff; margin-bottom: 14px; }
.cta-banner p { font-size: 17px; color: rgba(255,255,255,0.8); margin-bottom: 32px; }
.btn-white {
  display: inline-flex; align-items: center; gap: 8px;
  background: #fff; color: var(--blue); padding: 14px 36px; border-radius: 8px;
  text-decoration: none; font-weight: 700; font-size: 15px; transition: transform .15s, box-shadow .15s;
}
.btn-white:hover { transform: translateY(-2px); box-shadow: 0 8px 24px rgba(0,0,0,.2); }

/* ===== CONTACT ===== */
#contact { background: var(--white); }
.contact-grid { display: grid; grid-template-columns: 1fr 1.4fr; gap: 60px; align-items: start; }
.contact-info h3 { font-family: 'Montserrat', sans-serif; font-size: 22px; font-weight: 700; color: var(--dark); margin-bottom: 8px; }
.contact-info > p { font-size: 15px; color: var(--text); margin-bottom: 36px; line-height: 1.7; }
.contact-item { display: flex; align-items: flex-start; gap: 16px; margin-bottom: 24px; }
.contact-item-icon {
  width: 44px; height: 44px; flex-shrink: 0;
  background: var(--blue-l); border-radius: 10px;
  display: flex; align-items: center; justify-content: center; font-size: 18px;
}
.contact-item h4 { font-size: 13px; font-weight: 600; color: var(--dark); margin-bottom: 2px; }
.contact-item p { font-size: 14px; color: var(--text); }
.contact-item a { color: var(--blue); text-decoration: none; }
.contact-item a:hover { text-decoration: underline; }
.inquiry-form { background: var(--bg); border-radius: 16px; padding: 36px; }
.inquiry-form h3 { font-family: 'Montserrat', sans-serif; font-size: 20px; font-weight: 700; color: var(--dark); margin-bottom: 24px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { margin-bottom: 16px; }
.form-group label { display: block; font-size: 13px; font-weight: 600; color: var(--dark); margin-bottom: 6px; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 12px 14px; border: 1px solid var(--border); border-radius: 8px;
  font-family: 'Inter', sans-serif; font-size: 14px; color: var(--gray); background: var(--white); outline: none;
  transition: border-color .2s, box-shadow .2s;
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--blue); box-shadow: 0 0 0 3px rgba(var(--blue-rgb), 0.12);
}
.form-group textarea { resize: vertical; min-height: 100px; }
.form-submit {
  width: 100%; padding: 14px; background: var(--blue); color: #fff; border: none;
  border-radius: 8px; font-family: 'Inter', sans-serif; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: background .2s, transform .15s;
}
.form-submit:hover { background: var(--blue-d); transform: translateY(-1px); }
.form-note { font-size: 12px; color: var(--text); text-align: center; margin-top: 12px; }
.form-success {
  display: none; text-align: center; padding: 32px;
  font-size: 16px; color: #2D7D46; font-weight: 600;
}

/* ===== FOOTER ===== */
footer { background: var(--dark); color: rgba(255,255,255,0.6); padding: 56px 32px 24px; }
.footer-grid {
  max-width: 1280px; margin: 0 auto;
  display: grid; grid-template-columns: 2fr 1fr 1fr 1fr; gap: 40px;
  padding-bottom: 40px; border-bottom: 1px solid rgba(255,255,255,0.08);
}
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { font-size: 13px; line-height: 1.7; max-width: 280px; }
.footer-col h4 { font-size: 12px; font-weight: 700; color: rgba(255,255,255,0.9); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 16px; }
.footer-col ul { list-style: none; }
.footer-col ul li { margin-bottom: 8px; }
.footer-col ul li a { font-size: 13px; color: rgba(255,255,255,0.55); text-decoration: none; transition: color .2s; }
.footer-col ul li a:hover { color: var(--white); }
.footer-bottom {
  max-width: 1280px; margin: 24px auto 0;
  display: flex; justify-content: space-between; align-items: center;
  font-size: 12px; flex-wrap: wrap; gap: 8px;
}

/* ===== SCROLL TOP ===== */
#scrollTop {
  position: fixed; bottom: 32px; right: 32px; width: 44px; height: 44px;
  background: var(--blue); color: #fff; border: none; border-radius: 10px;
  display: none; align-items: center; justify-content: center;
  cursor: pointer; font-size: 18px; z-index: 888;
  box-shadow: 0 4px 16px rgba(var(--blue-rgb), 0.35); transition: background .2s;
}
#scrollTop.visible { display: flex; }
#scrollTop:hover { background: var(--blue-d); }

/* ===== PAGE-HEADER BASE ===== */
.page-header { padding: 120px 32px 52px; }
.page-header h1 { font-family: 'Montserrat', sans-serif; font-size: 42px; font-weight: 700; color: #fff; margin-bottom: 14px; line-height: 1.2; }
.page-header p { font-size: 17px; color: rgba(255,255,255,0.72); max-width: 640px; line-height: 1.7; }
.page-header .container { display: flex; align-items: center; gap: 32px; }
.page-header .container > div:first-child { flex: 1.1; min-width: 0; }
.page-header .container > div:last-child { flex: 0.9; min-width: 0; display: flex; align-items: center; justify-content: center; }
.page-header .container > div:last-child img { max-width: 100%; max-height: 380px; object-fit: contain; filter: drop-shadow(0 8px 24px rgba(0,0,0,0.35)); }

/* 当page-header只有左侧内容时（无右侧图片） */
.page-header .container:not(:has(> div:last-child img)) {
  max-width: 800px;
}@media (max-width: 768px) {
  .page-header { padding: 80px 24px 40px; }
  .page-header h1 { font-size: 32px; }
  .page-header .container { flex-direction: column; align-items: flex-start; gap: 16px; }
  .page-header .container > div:last-child { width: 100%; justify-content: flex-start; }
  .page-header .container > div:last-child img { max-height: 260px; }
}

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .products-grid { grid-template-columns: 1fr 1fr; }
  .solutions-grid { grid-template-columns: 1fr 1fr; }
  .why-grid { grid-template-columns: 1fr 1fr; }
  .certs-grid { grid-template-columns: repeat(3,1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}

/* 当page-header只有左侧内容时（无右侧图片） */
.page-header .container:not(:has(> div:last-child img)) {
  max-width: 800px;
}@media (max-width: 768px) {
  .nav-links { display: none; }
  .hamburger { display: block; }
  .hero-inner { grid-template-columns: 1fr; padding: 60px 24px; }
  .hero h1 { font-size: 34px; }
  .hero-visual { display: none; }
  .hero-stats { gap: 20px; }
  .products-grid, .solutions-grid, .why-grid { grid-template-columns: 1fr; }
  .certs-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
  section { padding: 56px 20px; }
  .form-row { grid-template-columns: 1fr; }
}