/* ===================================================
   蜀利元智能润滑器 - 全局样式
   Brand: #C41230 (红) | #1E6FDE (蓝) | #F5F7FA (灰白)
   =================================================== */

/* ---------- CSS变量 ---------- */
:root {
  --brand-red: #C41230;
  --brand-red-dark: #A00E28;
  --brand-blue: #1E6FDE;
  --brand-blue-dark: #1558B8;
  --bg-white: #FFFFFF;
  --bg-gray: #F5F7FA;
  --bg-dark: #0D1117;
  --text-primary: #1A1A1A;
  --text-secondary: #333333;
  --text-muted: #6B7280;
  --text-white: #FFFFFF;
  --border-color: #E5E7EB;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.08);
  --shadow-md: 0 4px 16px rgba(0,0,0,0.10);
  --shadow-lg: 0 12px 40px rgba(0,0,0,0.14);
  --shadow-card: 0 2px 12px rgba(0,0,0,0.06);
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 28px;
  --transition: cubic-bezier(0.4, 0, 0.2, 1);
  --nav-height: 72px;
}

/* ---------- 重置 ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: 'PingFang SC', 'Noto Sans SC', 'Microsoft YaHei', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text-secondary);
  background: var(--bg-white);
  line-height: 1.6;
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { text-decoration: none; color: inherit; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ---------- 排版 ---------- */
h1 { font-size: clamp(36px, 5vw, 64px); font-weight: 800; line-height: 1.15; color: var(--text-primary); }
h2 { font-size: clamp(28px, 3.5vw, 40px); font-weight: 700; line-height: 1.2; color: var(--text-primary); }
h3 { font-size: clamp(20px, 2.5vw, 28px); font-weight: 600; line-height: 1.3; color: var(--text-primary); }
h4 { font-size: 18px; font-weight: 600; color: var(--text-primary); }
p { line-height: 1.75; }

/* ---------- 容器 ---------- */
.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}
.container-wide {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 24px;
}
.section-pad { padding: 96px 0; }
.section-pad-sm { padding: 64px 0; }

/* ---------- 通用组件 ---------- */
.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--brand-red);
  margin-bottom: 16px;
}
.section-label::before {
  content: '';
  display: block;
  width: 20px;
  height: 2px;
  background: var(--brand-red);
  border-radius: 2px;
}

.section-title {
  font-size: clamp(28px, 3.5vw, 42px);
  font-weight: 700;
  color: var(--text-primary);
  line-height: 1.2;
  margin-bottom: 16px;
}
.section-title span { color: var(--brand-red); }

.section-subtitle {
  font-size: 17px;
  color: var(--text-muted);
  max-width: 580px;
  line-height: 1.75;
}

/* 分割线 */
.section-divider {
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, var(--brand-red), var(--brand-blue));
  border-radius: 4px;
  margin: 20px 0 32px;
}

/* 标题区域 */
.section-header {
  text-align: center;
  margin-bottom: 64px;
}
.section-header .section-subtitle {
  margin: 0 auto;
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 32px;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all 250ms var(--transition);
  letter-spacing: 0.02em;
  white-space: nowrap;
}
.btn-primary {
  background: var(--brand-red);
  color: #fff;
  box-shadow: 0 4px 16px rgba(196,18,48,0.3);
}
.btn-primary:hover {
  background: var(--brand-red-dark);
  box-shadow: 0 6px 24px rgba(196,18,48,0.4);
  transform: translateY(-2px);
}
.btn-secondary {
  background: transparent;
  color: var(--brand-red);
  border: 2px solid var(--brand-red);
}
.btn-secondary:hover {
  background: var(--brand-red);
  color: #fff;
  transform: translateY(-2px);
}
.btn-blue {
  background: var(--brand-blue);
  color: #fff;
  box-shadow: 0 4px 16px rgba(30,111,222,0.3);
}
.btn-blue:hover {
  background: var(--brand-blue-dark);
  box-shadow: 0 6px 24px rgba(30,111,222,0.4);
  transform: translateY(-2px);
}
.btn-white {
  background: #fff;
  color: var(--brand-red);
  box-shadow: var(--shadow-md);
}
.btn-white:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.btn-lg { padding: 18px 40px; font-size: 16px; border-radius: 8px; }
.btn-sm { padding: 10px 20px; font-size: 14px; }

.btn svg, .btn .icon { transition: transform 250ms var(--transition); }
.btn:hover svg, .btn:hover .icon { transform: translateX(3px); }

/* ---------- 导航 ---------- */
.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  background: rgba(255,255,255,0.95);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid transparent;
  transition: border-color 300ms, box-shadow 300ms;
}
.navbar.scrolled {
  border-bottom-color: var(--border-color);
  box-shadow: 0 2px 20px rgba(0,0,0,0.06);
}
.navbar-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.navbar-logo {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-shrink: 0;
}
.logo-mark {
  width: 42px;
  height: 42px;
  background: var(--brand-red);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.logo-mark svg { width: 24px; height: 24px; }
.logo-text { line-height: 1.1; }
.logo-text .name { font-size: 17px; font-weight: 800; color: var(--text-primary); letter-spacing: -0.02em; }
.logo-text .tagline { font-size: 11px; color: var(--text-muted); letter-spacing: 0.05em; }
.logo-img { height: 40px; width: auto; display: block; }

.navbar-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  flex: 1;
  justify-content: center;
}
.nav-link {
  padding: 8px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: all 200ms;
  position: relative;
}
.nav-link::after {
  content: '';
  position: absolute;
  bottom: 4px;
  left: 16px;
  right: 16px;
  height: 2px;
  background: var(--brand-red);
  border-radius: 2px;
  transform: scaleX(0);
  transition: transform 200ms var(--transition);
}
.nav-link:hover, .nav-link.active { color: var(--brand-red); }
.nav-link:hover::after, .nav-link.active::after { transform: scaleX(1); }

.navbar-cta { flex-shrink: 0; }

/* 汉堡菜单 */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 28px;
  padding: 4px;
  cursor: pointer;
}
.hamburger span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: all 300ms var(--transition);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 移动端菜单 */
.mobile-menu {
  display: none;
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: #fff;
  border-bottom: 1px solid var(--border-color);
  box-shadow: var(--shadow-lg);
  z-index: 999;
  padding: 16px 24px;
  flex-direction: column;
  gap: 4px;
  transform: translateY(-8px);
  opacity: 0;
  transition: all 300ms var(--transition);
}
.mobile-menu.open {
  display: flex;
  transform: translateY(0);
  opacity: 1;
}
.mobile-menu .nav-link {
  padding: 14px 16px;
  font-size: 16px;
  border-radius: var(--radius-sm);
}
.mobile-menu .nav-link::after { display: none; }
.mobile-menu .nav-link:hover, .mobile-menu .nav-link.active {
  background: rgba(196,18,48,0.06);
}
.mobile-menu .btn { width: 100%; justify-content: center; margin-top: 8px; }

/* ---------- Hero区 ---------- */
.hero {
  min-height: 100vh;
  padding-top: var(--nav-height);
  background: linear-gradient(135deg, #ffffff 0%, #f8f9fb 50%, #f0f4fa 100%);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
}

/* 背景流动线条SVG */
.hero-bg-curves {
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.4;
}

.hero-inner {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: center;
}

.hero-content {}
.hero-brand-line {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.hero-brand-name {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-muted);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}
.hero-brand-slogan {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-red);
  padding: 3px 10px;
  border: 1px solid var(--brand-red);
  border-radius: 20px;
  letter-spacing: 0.05em;
}

.hero-title {
  font-size: clamp(36px, 4.5vw, 60px);
  font-weight: 800;
  line-height: 1.1;
  color: var(--text-primary);
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.hero-subtitle-en {
  font-size: clamp(13px, 1.6vw, 18px);
  font-weight: 500;
  color: var(--text-tertiary);
  letter-spacing: 0.08em;
  margin-bottom: 24px;
}
.hero-title .model-name {
  color: var(--brand-red);
  position: relative;
}
.hero-title .model-name::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--brand-red);
  border-radius: 2px;
}

.hero-capacity-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: var(--brand-red);
  color: #fff;
  font-size: 16px;
  font-weight: 800;
  padding: 6px 16px;
  border-radius: 6px;
  margin-bottom: 20px;
  letter-spacing: 0.02em;
}

.hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 32px;
}
.hero-tag {
  font-size: 13px;
  font-weight: 600;
  color: var(--brand-blue);
  background: rgba(30,111,222,0.08);
  padding: 5px 14px;
  border-radius: 20px;
  border: 1px solid rgba(30,111,222,0.2);
}

/* 功能模块格子 */
.hero-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 36px;
}
.hero-feature-card {
  background: rgba(255,255,255,0.8);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 16px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
  transition: all 250ms var(--transition);
  backdrop-filter: blur(10px);
}
.hero-feature-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
  border-color: rgba(196,18,48,0.2);
}
.feature-icon-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(196,18,48,0.08);
  border: 1.5px solid rgba(196,18,48,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.feature-icon-circle svg { width: 20px; height: 20px; }
.feature-icon-circle.blue {
  background: rgba(30,111,222,0.08);
  border-color: rgba(30,111,222,0.2);
}
.hero-feature-text .title { font-size: 13px; font-weight: 700; color: var(--text-primary); margin-bottom: 2px; }
.hero-feature-text .desc { font-size: 12px; color: var(--text-muted); line-height: 1.5; }

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

/* Hero右侧产品图 */
.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.hero-product-wrap {
  position: relative;
  width: 100%;
  max-width: 480px;
}
.hero-product-bg {
  width: 100%;
  aspect-ratio: 4/5;
  background: linear-gradient(135deg, rgba(30,111,222,0.06) 0%, rgba(196,18,48,0.04) 100%);
  border-radius: var(--radius-xl);
  border: 1px solid rgba(30,111,222,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  position: relative;
}

/* 产品SVG占位图 */
.product-illustration {
  width: 80%;
  max-width: 320px;
}
.product-hero-img {
  width: 85%;
  max-width: 340px;
  height: auto;
  object-fit: contain;
  filter: drop-shadow(0 20px 40px rgba(30,111,222,0.15));
}

/* 浮动监控卡片 */
.hero-monitor-card {
  position: absolute;
  bottom: -20px;
  left: -20px;
  background: #fff;
  border-radius: var(--radius-md);
  padding: 16px 20px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  min-width: 200px;
  animation: float 3s ease-in-out infinite;
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-8px); }
}
.monitor-card-title { font-size: 11px; font-weight: 600; color: var(--text-muted); letter-spacing: 0.05em; text-transform: uppercase; margin-bottom: 8px; }
.monitor-stats { display: flex; gap: 16px; }
.monitor-stat { text-align: center; }
.monitor-stat .val { font-size: 20px; font-weight: 800; color: var(--brand-red); }
.monitor-stat .label { font-size: 10px; color: var(--text-muted); }
.monitor-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: #22C55E; margin-right: 4px; animation: pulse 1.5s ease-in-out infinite; }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }

/* 参数浮窗 */
.hero-param-badge {
  position: absolute;
  top: 20px;
  right: -10px;
  background: var(--brand-blue);
  color: #fff;
  border-radius: var(--radius-md);
  padding: 12px 16px;
  font-size: 12px;
  font-weight: 600;
  box-shadow: 0 8px 24px rgba(30,111,222,0.3);
  line-height: 1.6;
}
.hero-param-badge .highlight { font-size: 22px; font-weight: 800; display: block; }

/* ---------- 产品特点横向卡片 ---------- */
.features-strip {
  background: var(--bg-white);
  border-top: 1px solid var(--border-color);
  border-bottom: 1px solid var(--border-color);
  padding: 48px 0;
}
.features-strip-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1px;
  background: var(--border-color);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.feature-strip-card {
  background: var(--bg-white);
  padding: 32px 28px;
  text-align: center;
  transition: all 250ms var(--transition);
}
.feature-strip-card:hover {
  background: var(--bg-gray);
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  z-index: 1;
  position: relative;
}
.feature-strip-icon {
  width: 56px;
  height: 56px;
  border-radius: 50%;
  background: rgba(196,18,48,0.06);
  border: 2px solid rgba(196,18,48,0.15);
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  transition: all 250ms;
}
.feature-strip-card:hover .feature-strip-icon {
  background: var(--brand-red);
  border-color: var(--brand-red);
}
.feature-strip-card:hover .feature-strip-icon svg { color: #fff; }
.feature-strip-icon svg { width: 26px; height: 26px; color: var(--brand-red); }
.feature-strip-card h4 { font-size: 15px; font-weight: 700; margin-bottom: 6px; color: var(--text-primary); }
.feature-strip-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ---------- 产品展示区 ---------- */
.product-showcase {
  padding: 96px 0;
  background: var(--bg-gray);
}
.product-showcase-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.showcase-visual {
  position: relative;
}
.showcase-img-wrap {
  background: linear-gradient(135deg, #fff 0%, #f0f4fa 100%);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}
.showcase-product-img {
  max-width: 280px;
  width: 100%;
  height: auto;
  display: block;
  margin: 0 auto;
  filter: drop-shadow(0 16px 32px rgba(0,0,0,0.1));
}
.showcase-img-wrap::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -30%;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(196,18,48,0.06) 0%, transparent 70%);
}
.product-spec-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 24px;
  justify-content: center;
}
.spec-tag {
  font-size: 12px;
  font-weight: 600;
  padding: 5px 14px;
  border-radius: 20px;
  background: rgba(196,18,48,0.06);
  color: var(--brand-red);
  border: 1px solid rgba(196,18,48,0.15);
}
.spec-tag.blue {
  background: rgba(30,111,222,0.06);
  color: var(--brand-blue);
  border-color: rgba(30,111,222,0.15);
}

.showcase-content {}
.showcase-params-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 32px 0;
}
.param-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px;
  transition: all 250ms;
}
.param-card:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.param-val { font-size: 28px; font-weight: 800; color: var(--brand-red); line-height: 1; margin-bottom: 4px; }
.param-label { font-size: 13px; color: var(--text-muted); }

/* ---------- 应用领域区 ---------- */
.industries {
  padding: 96px 0;
  background: var(--bg-white);
}
.industries-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 16px;
  margin-top: 56px;
}
.industry-card {
  text-align: center;
  padding: 32px 16px;
  border-radius: var(--radius-lg);
  border: 1.5px solid var(--border-color);
  background: var(--bg-white);
  transition: all 300ms var(--transition);
  cursor: pointer;
}
.industry-card:hover {
  border-color: var(--brand-blue);
  background: rgba(30,111,222,0.04);
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(30,111,222,0.12);
}
.industry-icon {
  width: 72px;
  height: 72px;
  background: linear-gradient(135deg, rgba(30,111,222,0.08), rgba(30,111,222,0.04));
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  transition: all 300ms;
}
.industry-card:hover .industry-icon {
  background: var(--brand-blue);
}
.industry-icon svg { width: 36px; height: 36px; color: var(--brand-blue); transition: all 300ms; }
.industry-card:hover .industry-icon svg { color: #fff; }
.industry-card h4 { font-size: 15px; font-weight: 700; color: var(--text-primary); margin-bottom: 6px; }
.industry-card p { font-size: 12px; color: var(--text-muted); }

/* ---------- 信任背书区 ---------- */
.trust-section {
  padding: 80px 0;
  background: linear-gradient(180deg, var(--bg-gray) 0%, var(--bg-white) 100%);
}
.trust-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 64px;
}
.trust-stat {
  text-align: center;
  padding: 32px 16px;
}
.trust-stat .num {
  font-size: clamp(36px, 4vw, 52px);
  font-weight: 900;
  color: var(--brand-red);
  line-height: 1;
  margin-bottom: 8px;
  letter-spacing: -0.02em;
}
.trust-stat .unit { font-size: 22px; font-weight: 700; }
.trust-stat .desc { font-size: 14px; color: var(--text-muted); }

.partner-logos {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
  align-items: center;
}
.partner-logo-box {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-md);
  padding: 20px 16px;
  text-align: center;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-muted);
  transition: all 250ms;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.partner-logo-box:hover {
  border-color: var(--brand-blue);
  color: var(--brand-blue);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ---------- CTA Banner ---------- */
.cta-banner {
  background: linear-gradient(135deg, var(--brand-red) 0%, #8B0000 100%);
  padding: 80px 0;
  position: relative;
  overflow: hidden;
}
.cta-banner::before {
  content: '';
  position: absolute;
  top: -40%;
  right: -10%;
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(255,255,255,0.08) 0%, transparent 70%);
}
.cta-banner-inner {
  text-align: center;
  position: relative;
  z-index: 1;
}
.cta-banner h2 { color: #fff; font-size: clamp(26px, 3vw, 38px); margin-bottom: 16px; }
.cta-banner p { color: rgba(255,255,255,0.8); font-size: 17px; margin-bottom: 36px; max-width: 560px; margin-left: auto; margin-right: auto; }
.cta-banner-btns { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ---------- Footer ---------- */
.footer {
  background: #0D1117;
  color: rgba(255,255,255,0.7);
  padding: 64px 0 32px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-col { min-width: 0; }
.footer-brand {}
.footer-logo { display: flex; align-items: center; gap: 12px; margin-bottom: 16px; }
.footer-logo .logo-mark { background: var(--brand-red); }
.footer-logo .name { color: #fff; }
.footer-logo .tagline { color: rgba(255,255,255,0.5); }
.footer-logo .logo-img { filter: brightness(0) invert(1); }
.footer-desc { font-size: 14px; line-height: 1.75; margin-bottom: 24px; }
.footer-social { display: flex; gap: 12px; }
.social-btn {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 200ms;
}
.social-btn:hover { background: var(--brand-red); }
.social-btn svg { width: 18px; height: 18px; color: #fff; }

.footer-col h5 { color: #fff; font-size: 14px; font-weight: 700; margin-bottom: 20px; letter-spacing: 0.05em; overflow: hidden; text-overflow: ellipsis; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { font-size: 14px; color: rgba(255,255,255,0.6); transition: color 200ms; }
.footer-links a:hover { color: #fff; }

.footer-contact { display: flex; flex-direction: column; gap: 12px; }
.contact-item { display: flex; align-items: flex-start; gap: 10px; font-size: 14px; }
.contact-item svg { width: 16px; height: 16px; color: var(--brand-red); flex-shrink: 0; margin-top: 2px; }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: rgba(255,255,255,0.4);
}

/* ---------- 页面Banner ---------- */
.page-hero {
  background: linear-gradient(135deg, #0D1117 0%, #1a2535 100%);
  padding: calc(var(--nav-height) + 64px) 0 64px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.page-hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: 
    radial-gradient(ellipse 60% 60% at 20% 50%, rgba(196,18,48,0.15) 0%, transparent 60%),
    radial-gradient(ellipse 60% 60% at 80% 50%, rgba(30,111,222,0.12) 0%, transparent 60%);
}
.page-hero-content { position: relative; z-index: 1; }
.page-hero h1 { color: #fff; margin-bottom: 16px; }
.page-hero p { color: rgba(255,255,255,0.7); font-size: 18px; max-width: 600px; margin: 0 auto; }
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 8px;
  justify-content: center;
  font-size: 13px;
  color: rgba(255,255,255,0.5);
  margin-bottom: 24px;
}
.breadcrumb a { color: rgba(255,255,255,0.6); transition: color 200ms; }
.breadcrumb a:hover { color: #fff; }
.breadcrumb .sep { opacity: 0.4; }

/* ---------- 卡片通用 ---------- */
.card {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: all 300ms var(--transition);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(196,18,48,0.15);
}

/* ---------- 对比表 ---------- */
.compare-section {
  padding: 96px 0;
  background: var(--bg-gray);
}
.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  margin-top: 48px;
}
.compare-col {
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.compare-header {
  padding: 24px 32px;
  font-size: 17px;
  font-weight: 700;
}
.compare-header.old { background: #F3F4F6; color: var(--text-muted); }
.compare-header.new { background: var(--brand-red); color: #fff; }
.compare-body { background: #fff; border: 1px solid var(--border-color); border-top: none; border-radius: 0 0 var(--radius-lg) var(--radius-lg); }
.compare-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
  font-size: 14px;
}
.compare-item:last-child { border-bottom: none; }
.compare-icon { font-size: 16px; flex-shrink: 0; margin-top: 1px; }

/* ---------- 参数表格 ---------- */
.params-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 14px;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.params-table th {
  background: var(--text-primary);
  color: #fff;
  padding: 14px 20px;
  text-align: left;
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.03em;
}
.params-table td {
  padding: 13px 20px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-secondary);
}
.params-table tr:last-child td { border-bottom: none; }
.params-table tr:nth-child(even) td { background: var(--bg-gray); }
.params-table td:first-child { font-weight: 600; color: var(--text-primary); }
.params-table td .highlight { color: var(--brand-red); font-weight: 700; }

/* ---------- 安装步骤 ---------- */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  position: relative;
  margin-top: 48px;
}
.steps-grid::before {
  content: '';
  position: absolute;
  top: 36px;
  left: 10%;
  right: 10%;
  height: 2px;
  background: linear-gradient(90deg, var(--brand-red), var(--brand-blue));
  z-index: 0;
}
.step-card {
  background: #fff;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  text-align: center;
  position: relative;
  z-index: 1;
  transition: all 250ms;
}
.step-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
  border-color: rgba(196,18,48,0.2);
}
.step-num {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--brand-red);
  color: #fff;
  font-size: 20px;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 16px;
  box-shadow: 0 4px 16px rgba(196,18,48,0.3);
}
.step-card h4 { font-size: 15px; margin-bottom: 8px; }
.step-card p { font-size: 13px; color: var(--text-muted); line-height: 1.6; }

/* ---------- 行业卡片 (解决方案页) ---------- */
.solution-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: center;
  margin-bottom: 48px;
}
.solution-nav-btn {
  padding: 10px 24px;
  border-radius: 30px;
  border: 1.5px solid var(--border-color);
  font-size: 14px;
  font-weight: 600;
  color: var(--text-muted);
  background: var(--bg-white);
  transition: all 200ms;
  cursor: pointer;
}
.solution-nav-btn:hover,
.solution-nav-btn.active {
  background: var(--brand-red);
  color: #fff;
  border-color: var(--brand-red);
}

.solution-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.solution-card {
  background: var(--bg-white);
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all 300ms var(--transition);
}
.solution-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(196,18,48,0.2);
}
.solution-card-header {
  background: linear-gradient(135deg, var(--brand-blue) 0%, #1a58b8 100%);
  padding: 28px;
  color: #fff;
}
.solution-card-header .icon-wrap {
  width: 52px;
  height: 52px;
  background: rgba(255,255,255,0.2);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}
.solution-card-header .icon-wrap svg { width: 28px; height: 28px; color: #fff; }
.solution-card-header h3 { font-size: 18px; font-weight: 700; margin-bottom: 4px; }
.solution-card-header p { font-size: 13px; opacity: 0.8; }
.solution-card-body { padding: 24px 28px; }
.pain-points { margin-bottom: 20px; }
.pain-points h5 { font-size: 13px; font-weight: 700; color: var(--text-muted); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.05em; }
.pain-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.pain-item::before { content: '✕'; color: #EF4444; font-size: 11px; flex-shrink: 0; margin-top: 2px; }
.solution-points h5 { font-size: 13px; font-weight: 700; color: var(--brand-red); margin-bottom: 10px; text-transform: uppercase; letter-spacing: 0.05em; }
.solution-item {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 13px;
  color: var(--text-secondary);
  margin-bottom: 6px;
}
.solution-item::before { content: '✓'; color: var(--brand-blue); font-size: 11px; flex-shrink: 0; margin-top: 2px; }
.solution-card-footer { padding: 0 28px 24px; }

/* ---------- 联系页 ---------- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1.5fr;
  gap: 64px;
  align-items: start;
}
.contact-info-card {
  background: linear-gradient(135deg, #0D1117, #1a2535);
  color: #fff;
  border-radius: var(--radius-xl);
  padding: 48px;
}
.contact-info-card h3 { color: #fff; margin-bottom: 8px; }
.contact-info-card > p { color: rgba(255,255,255,0.6); margin-bottom: 40px; }
.contact-info-list { display: flex; flex-direction: column; gap: 24px; }
.contact-info-item { display: flex; gap: 16px; }
.contact-info-icon {
  width: 44px;
  height: 44px;
  background: rgba(196,18,48,0.2);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}
.contact-info-icon svg { width: 20px; height: 20px; color: var(--brand-red); }
.contact-info-item h5 { font-size: 13px; color: rgba(255,255,255,0.5); margin-bottom: 4px; font-weight: 500; }
.contact-info-item p { color: #fff; font-size: 15px; font-weight: 500; }

/* 表单 */
.contact-form-wrap {
  background: var(--bg-white);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  padding: 48px;
  box-shadow: var(--shadow-md);
}
.contact-form-wrap h3 { margin-bottom: 8px; }
.contact-form-wrap > p { color: var(--text-muted); margin-bottom: 32px; }
.form-group {
  margin-bottom: 20px;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 8px;
}
.form-label .required { color: var(--brand-red); margin-left: 2px; }
.form-input, .form-textarea, .form-select {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--border-color);
  border-radius: var(--radius-sm);
  font-size: 15px;
  color: var(--text-primary);
  background: var(--bg-white);
  transition: border-color 200ms, box-shadow 200ms;
  outline: none;
}
.form-input:focus, .form-textarea:focus {
  border-color: var(--brand-red);
  box-shadow: 0 0 0 3px rgba(196,18,48,0.1);
}
.form-input.error, .form-textarea.error { border-color: #EF4444; }
.form-error { font-size: 12px; color: #EF4444; margin-top: 6px; }
.form-textarea { min-height: 120px; resize: vertical; }
.form-submit { width: 100%; padding: 16px; font-size: 16px; margin-top: 8px; }

/* 成功提示 */
.form-success {
  display: none;
  text-align: center;
  padding: 40px;
}
.form-success.show { display: block; }
.success-icon {
  width: 72px;
  height: 72px;
  background: rgba(34,197,94,0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 20px;
}
.success-icon svg { width: 36px; height: 36px; color: #22C55E; }

/* ---------- 滚动动画 ---------- */
.fade-up {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 500ms var(--transition), transform 500ms var(--transition);
}
.fade-up.visible { opacity: 1; transform: translateY(0); }
.fade-up-delay-1 { transition-delay: 80ms; }
.fade-up-delay-2 { transition-delay: 160ms; }
.fade-up-delay-3 { transition-delay: 240ms; }
.fade-up-delay-4 { transition-delay: 320ms; }

/* ---------- 响应式 ---------- */
@media (max-width: 1023px) {
  .navbar-nav, .navbar-cta { display: none; }
  .hamburger { display: flex; }

  .hero-inner {
    grid-template-columns: 1fr;
    gap: 40px;
    padding: 60px 24px;
  }
  .hero-visual {
    display: flex;
    order: -1;
    justify-content: center;
  }
  .hero-product-wrap { max-width: 360px; }
  .hero-product-bg { aspect-ratio: 4/5; }
  .hero-monitor-card { left: 0; bottom: -12px; min-width: 170px; padding: 12px 14px; }
  .hero-param-badge { right: 0; top: 12px; padding: 8px 12px; }
  .hero-param-badge .highlight { font-size: 18px; }

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

  .product-showcase-inner { grid-template-columns: 1fr; gap: 40px; }
  .showcase-visual { display: flex; justify-content: center; }
  .showcase-img-wrap { max-width: 400px; margin: 0 auto; padding: 32px; }
  .showcase-product-img { max-width: 220px; }

  .industries-grid { grid-template-columns: repeat(3, 1fr); }

  .trust-stats { grid-template-columns: repeat(2, 1fr); }
  .partner-logos { grid-template-columns: repeat(3, 1fr); }

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

  .compare-grid { grid-template-columns: 1fr; }
  .steps-grid { grid-template-columns: repeat(2, 1fr); }
  .steps-grid::before { display: none; }

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

  .cta-banner { padding: 60px 0; }
  .float-consult { right: 16px; bottom: 24px; }
  .float-btn { width: 46px; height: 46px; }
  .float-btn svg { width: 20px; height: 20px; }
}

@media (max-width: 767px) {
  :root { --nav-height: 64px; }

  .section-pad { padding: 56px 0; }
  .section-pad-sm { padding: 40px 0; }
  .section-header { margin-bottom: 40px; }
  h1 { font-size: 30px; }
  h2 { font-size: 24px; }
  h3 { font-size: 20px; }
  .section-title { font-size: 24px; }

  /* Hero */
  .hero-inner { padding: 40px 20px; gap: 24px; }
  .hero-product-wrap { max-width: 280px; }
  .hero-brand-line { margin-bottom: 16px; }
  .hero-title { font-size: 28px; }
  .hero-subtitle-en { font-size: 12px; margin-bottom: 12px; }
  .hero-capacity-badge { font-size: 14px; padding: 5px 12px; }
  .hero-tags { gap: 6px; margin-bottom: 24px; }
  .hero-tag { font-size: 12px; padding: 4px 10px; }
  .hero-features { grid-template-columns: 1fr 1fr; gap: 8px; margin-bottom: 28px; }
  .hero-feature-card { padding: 12px; gap: 8px; }
  .feature-icon-circle { width: 34px; height: 34px; }
  .feature-icon-circle svg { width: 16px; height: 16px; }
  .hero-feature-text .title { font-size: 12px; }
  .hero-feature-text .desc { font-size: 11px; }
  .hero-cta { flex-direction: column; gap: 10px; }
  .hero-cta .btn { width: 100%; justify-content: center; }
  .hero-monitor-card { min-width: 150px; }
  .monitor-stat .val { font-size: 16px; }

  /* Features strip */
  .features-strip-grid { grid-template-columns: 1fr 1fr; }
  .feature-strip-card { padding: 20px 16px; }
  .feature-strip-icon { width: 46px; height: 46px; }
  .feature-strip-icon svg { width: 22px; height: 22px; }

  /* Product showcase */
  .showcase-params-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .param-card { padding: 16px; }
  .param-val { font-size: 24px; }

  /* Industries */
  .industries-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .industry-card { padding: 24px 12px; }
  .industry-icon { width: 56px; height: 56px; }
  .industry-icon svg { width: 28px; height: 28px; }

  /* Trust */
  .trust-stats { grid-template-columns: 1fr 1fr; gap: 16px; }
  .trust-stat { padding: 24px 12px; }
  .trust-stat .num { font-size: 32px; }
  .trust-stat .unit { font-size: 18px; }
  .partner-logos { grid-template-columns: repeat(2, 1fr); gap: 10px; }

  /* Footer */
  .footer { padding: 48px 0 24px; }
  .footer-grid { grid-template-columns: 1fr; gap: 28px; }
  .footer-bottom { flex-direction: column; text-align: center; }

  /* Steps */
  .steps-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
  .step-card { padding: 20px 16px; }
  .step-num { width: 44px; height: 44px; font-size: 18px; }

  /* Solution cards */
  .solution-cards { grid-template-columns: 1fr; }
  .solution-card-header { padding: 20px; }
  .solution-card-body { padding: 20px; }
  .solution-card-footer { padding: 0 20px 20px; }

  /* Contact */
  .contact-form-wrap, .contact-info-card { padding: 24px 16px; }
  .form-row { grid-template-columns: 1fr; }

  /* CTA Banner */
  .cta-banner { padding: 48px 0; }
  .cta-banner-btns { flex-direction: column; align-items: center; }
  .cta-banner-btns .btn { width: 80%; justify-content: center; }

  /* Compare */
  .compare-header { padding: 16px 20px; font-size: 15px; }
  .compare-item { padding: 12px 16px; font-size: 13px; }

  /* Table horizontal scroll */
  .params-table { font-size: 13px; }
  .params-table th, .params-table td { padding: 10px 12px; }

  /* Page hero */
  .page-hero { padding: calc(var(--nav-height) + 40px) 0 48px; }
  .page-hero p { font-size: 15px; }

  /* Float buttons */
  .float-consult { right: 12px; bottom: 20px; gap: 8px; }
  .float-btn { width: 44px; height: 44px; }
  .float-tooltip { display: none; }
}

@media (max-width: 480px) {
  .container { padding: 0 16px; }
  .section-pad { padding: 44px 0; }

  /* Hero */
  .hero-inner { padding: 32px 16px; }
  .hero-features { grid-template-columns: 1fr; }
  .hero-product-wrap { max-width: 220px; }
  .hero-monitor-card { min-width: 130px; padding: 10px 12px; }
  .monitor-stats { gap: 10px; }
  .monitor-stat .val { font-size: 14px; }
  .hero-param-badge { padding: 6px 10px; font-size: 11px; }
  .hero-param-badge .highlight { font-size: 16px; }

  /* Industries */
  .industries-grid { grid-template-columns: 1fr 1fr; gap: 10px; }
  .industry-card { padding: 20px 10px; }
  .industry-icon { width: 48px; height: 48px; }
  .industry-icon svg { width: 24px; height: 24px; }

  /* Features strip */
  .feature-strip-card { padding: 16px 12px; }
  .feature-strip-card h4 { font-size: 14px; }
  .feature-strip-card p { font-size: 12px; }

  /* Partner logos */
  .partner-logos { grid-template-columns: repeat(2, 1fr); }

  /* Steps */
  .steps-grid { grid-template-columns: 1fr; }

  /* Showcase */
  .showcase-img-wrap { padding: 24px; }
  .showcase-product-img { max-width: 180px; }
  .showcase-params-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
  .param-card { padding: 14px; }
  .param-val { font-size: 20px; }
  .param-label { font-size: 12px; }

  /* CTA */
  .cta-banner h2 { font-size: 22px; }
  .cta-banner p { font-size: 14px; }
}

/* ---------- 内联固定咨询悬浮按钮 ---------- */
.float-consult {
  position: fixed;
  right: 24px;
  bottom: 40px;
  z-index: 900;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.float-btn {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background: var(--brand-red);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 6px 24px rgba(196,18,48,0.4);
  transition: all 250ms;
  cursor: pointer;
}
.float-btn:hover {
  transform: scale(1.1);
  box-shadow: 0 8px 32px rgba(196,18,48,0.5);
}
.float-btn.blue { background: var(--brand-blue); box-shadow: 0 6px 24px rgba(30,111,222,0.4); }
.float-btn.blue:hover { box-shadow: 0 8px 32px rgba(30,111,222,0.5); }
.float-btn svg { width: 22px; height: 22px; }
.float-tooltip {
  position: absolute;
  right: 62px;
  background: var(--text-primary);
  color: #fff;
  font-size: 12px;
  font-weight: 600;
  padding: 6px 12px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms;
}
.float-btn:hover .float-tooltip { opacity: 1; }

/* 滚动进度条 */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--brand-red), var(--brand-blue));
  z-index: 9999;
  transition: width 100ms;
}