:root {
  --white: #ffffff;
  --bg-soft: #f7fafc;
  --bg-mid: #eef3f8;
  --primary: #0a6ed1;
  --primary-dark: #0858a8;
  --primary-light: #e8f2fc;
  --accent: #00b894;
  --accent-light: #e6f9f4;
  --orange: #f59e0b;
  --red: #ef4444;
  --text-1: #0f1f2e;
  --text-2: #4a5d70;
  --text-3: #8a9bb0;
  --border: #e2e8f0;
  --shadow-sm: 0 2px 10px rgba(15, 31, 46, 0.06);
  --shadow-md: 0 8px 30px rgba(15, 31, 46, 0.1);
  --shadow-lg: 0 20px 50px rgba(15, 31, 46, 0.14);
  --radius: 16px;
}



/* ===== 导航 ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 999;
  padding: 16px 5%;
  display: flex; align-items: center; justify-content: space-between;
  background: rgba(255,255,255,0.92);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: all 0.3s;
}
.nav-logo { display: flex; align-items: center; gap: 10px; font-size: 20px; font-weight: 800; color: var(--primary); }
.nav-logo svg { width: 30px; height: 30px; }
.nav-menu { display: flex; gap: 32px; list-style: none; }
.nav-menu a { color: var(--text-2); text-decoration: none; font-size: 14px; font-weight: 500; transition: color 0.3s; }
.nav-menu a:hover { color: var(--primary); }
.nav-btn {
  padding: 10px 24px; background: var(--primary); color: #fff;
  border: none; border-radius: 8px; font-size: 14px; font-weight: 600;
  cursor: pointer; transition: all 0.3s;
}
.nav-btn:hover { background: var(--primary-dark); transform: translateY(-1px); box-shadow: 0 6px 16px rgba(10,110,209,0.3); }

/* ===== Hero ===== */
.hero {
  position: relative; min-height: 100vh;
  display: flex; align-items: center;
  padding: 100px 5% 60px;
  overflow: hidden;
}
.hero-bg {
  position: absolute; inset: 0;
  background: url('../images/hero-water-plant.jpg') center/cover no-repeat;
  z-index: 0;
}
.hero-mask {
  position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(8,30,55,0.88) 0%, rgba(8,30,55,0.6) 45%, rgba(8,30,55,0.2) 100%);
  z-index: 1;
}
.hero-inner { position: relative; z-index: 2; display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 60px; align-items: center; width: 100%; max-width: 1400px; margin: 0 auto; }
.hero-tag {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 18px; background: rgba(255,255,255,0.12);
  border: 1px solid rgba(255,255,255,0.25); border-radius: 100px;
  color: #fff; font-size: 13px; margin-bottom: 24px; backdrop-filter: blur(8px);
}
.hero-tag .dot { width: 8px; height: 8px; border-radius: 50%; background: #4ade80; animation: blink 2s infinite; }
@keyframes blink { 0%,100%{opacity:1} 50%{opacity:0.4} }
.hero h1 { font-size: 52px; font-weight: 900; color: #fff; line-height: 1.2; margin-bottom: 20px; letter-spacing: -1px; }
.hero h1 em { font-style: normal; background: linear-gradient(90deg, #60a5fa, #34d399); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.hero p { font-size: 17px; color: rgba(255,255,255,0.8); line-height: 1.8; margin-bottom: 36px; max-width: 520px; }
.hero-actions { display: flex; gap: 14px; margin-bottom: 48px; }
.hero-btn-primary {
  padding: 15px 32px; background: linear-gradient(135deg, #3b82f6, #06b6d4);
  color: #fff; border: none; border-radius: 10px; font-size: 15px; font-weight: 600;
  cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; gap: 8px;
  box-shadow: 0 8px 24px rgba(59,130,246,0.4);
}
.hero-btn-primary:hover { transform: translateY(-2px); box-shadow: 0 12px 32px rgba(59,130,246,0.5); }
.hero-btn-ghost {
  padding: 15px 32px; background: rgba(255,255,255,0.1); color: #fff;
  border: 1px solid rgba(255,255,255,0.4); border-radius: 10px; font-size: 15px;
  cursor: pointer; transition: all 0.3s; backdrop-filter: blur(8px);
}
.hero-btn-ghost:hover { background: rgba(255,255,255,0.2); }

.hero-card {
  background: rgba(255,255,255,0.97); border-radius: 20px; padding: 32px;
  box-shadow: 0 24px 60px rgba(0,0,0,0.3); backdrop-filter: blur(20px);
}
.hero-card-title { font-size: 16px; font-weight: 700; color: var(--text-1); margin-bottom: 20px; display: flex; align-items: center; gap: 8px; }
.hero-card-title::before { content: ''; width: 4px; height: 18px; background: linear-gradient(180deg, #3b82f6, #06b6d4); border-radius: 2px; }
.hero-stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.hero-stat { padding: 16px; background: var(--bg-soft); border-radius: 12px; }
.hero-stat-num { font-size: 28px; font-weight: 900; color: var(--primary); line-height: 1; }
.hero-stat-num span { font-size: 14px; font-weight: 500; }
.hero-stat-label { font-size: 12px; color: var(--text-3); margin-top: 6px; }

/* ===== 数据条 ===== */
.data-bar {
  background: var(--primary); padding: 40px 5%;
  display: flex; justify-content: center; gap: 80px; flex-wrap: wrap;
}
.data-bar-item { text-align: center; color: #fff; }
.data-bar-num { font-size: 42px; font-weight: 900; line-height: 1; }
.data-bar-num span { font-size: 18px; font-weight: 500; }
.data-bar-label { font-size: 14px; opacity: 0.85; margin-top: 8px; }

/* ===== 通用区块 ===== */
.section { padding: 90px 5%; }
.section-head { text-align: center; margin-bottom: 56px; }
.section-eyebrow {
  display: inline-block; padding: 6px 16px; background: var(--primary-light);
  color: var(--primary); border-radius: 100px; font-size: 12px; font-weight: 600;
  letter-spacing: 2px; margin-bottom: 16px;
}
.section-title { font-size: 36px; font-weight: 800; color: var(--text-1); margin-bottom: 14px; }
.section-desc { font-size: 16px; color: var(--text-2); max-width: 600px; margin: 0 auto; }

/* ===== 痛点 ===== */
.pain-section { background: var(--bg-soft); }
.pain-wrap { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1fr 1fr; gap: 60px; align-items: center; }
.pain-img { position: relative; border-radius: 20px; overflow: hidden; box-shadow: var(--shadow-lg); }
.pain-img img { width: 100%; height: 420px; object-fit: cover; display: block; }
.pain-img-badge {
  position: absolute; bottom: 20px; left: 20px;
  background: rgba(255,255,255,0.95); padding: 12px 20px; border-radius: 10px;
  font-size: 13px; font-weight: 600; color: var(--text-1); box-shadow: var(--shadow-md);
}
.pain-list { display: flex; flex-direction: column; gap: 18px; }
.pain-item {
  display: flex; gap: 16px; padding: 22px; background: #fff;
  border-radius: 14px; border: 1px solid var(--border); transition: all 0.3s;
}
.pain-item:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateX(6px); }
.pain-icon {
  width: 48px; height: 48px; min-width: 48px; border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
}
.pain-icon svg { width: 24px; height: 24px; }
.pain-item h4 { font-size: 16px; font-weight: 700; margin-bottom: 6px; }
.pain-item p { font-size: 13px; color: var(--text-2); line-height: 1.6; }

/* ===== 解决方案 ===== */
.solution-wrap { max-width: 1200px; margin: 0 auto; }
.solution-hero-img {
  width: 100%; height: 360px; object-fit: cover; border-radius: 20px;
  box-shadow: var(--shadow-lg); margin-bottom: 48px;
}
.solution-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.solution-card {
  background: #fff; border: 1px solid var(--border); border-radius: 16px;
  padding: 32px 28px; transition: all 0.4s; position: relative; overflow: hidden;
}
.solution-card::before {
  content: ''; position: absolute; top: 0; left: 0; width: 100%; height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  transform: scaleX(0); transform-origin: left; transition: transform 0.4s;
}
.solution-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); border-color: transparent; }
.solution-card:hover::before { transform: scaleX(1); }
.solution-card-num { font-size: 40px; font-weight: 900; color: var(--primary-light); line-height: 1; margin-bottom: 16px; }
.solution-card h3 { font-size: 19px; font-weight: 700; margin-bottom: 12px; }
.solution-card p { font-size: 14px; color: var(--text-2); line-height: 1.7; }
.solution-tags { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 16px; }
.solution-tag { padding: 4px 10px; background: var(--bg-soft); border-radius: 4px; font-size: 11px; color: var(--text-2); }

/* ===== 核心功能 图文交错 ===== */
.feature-section { background: var(--bg-soft); }
.feature-row {
  max-width: 1200px; margin: 0 auto 60px;
  display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center;
}
.feature-row:last-child { margin-bottom: 0; }
.feature-row.reverse .feature-img { order: 2; }
.feature-img { border-radius: 18px; overflow: hidden; box-shadow: var(--shadow-lg); }
.feature-img img { width: 100%; height: 340px; object-fit: cover; display: block; transition: transform 0.6s; }
.feature-img:hover img { transform: scale(1.05); }
.feature-text h3 { font-size: 26px; font-weight: 800; margin-bottom: 16px; color: var(--text-1); }
.feature-text p { font-size: 15px; color: var(--text-2); line-height: 1.9; margin-bottom: 20px; }
.feature-points { list-style: none; }
.feature-points li {
  display: flex; align-items: flex-start; gap: 10px;
  font-size: 14px; color: var(--text-2); margin-bottom: 10px;
}
.feature-points li::before {
  content: ''; width: 18px; height: 18px; min-width: 18px; border-radius: 50%;
  background: var(--accent-light); display: flex; align-items: center; justify-content: center;
  margin-top: 2px;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2300b894' stroke-width='3'%3E%3Cpolyline points='20 6 9 17 4 12'/%3E%3C/svg%3E");
  background-repeat: no-repeat; background-position: center;
}

/* ===== 应用场景 ===== */
.scene-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(2, 1fr); gap: 28px; }
.scene-card {
  border-radius: 18px; overflow: hidden; position: relative;
  box-shadow: var(--shadow-md); transition: all 0.4s; cursor: pointer;
}
.scene-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-lg); }
.scene-card img { width: 100%; height: 260px; object-fit: cover; display: block; }
.scene-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 40%, rgba(8,30,55,0.9) 100%);
}
.scene-content { position: absolute; bottom: 0; left: 0; right: 0; padding: 28px; color: #fff; }
.scene-content h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.scene-content p { font-size: 13px; opacity: 0.85; line-height: 1.6; }
.scene-badge {
  position: absolute; top: 20px; left: 20px;
  padding: 6px 14px; background: rgba(255,255,255,0.9); border-radius: 100px;
  font-size: 12px; font-weight: 600; color: var(--primary);
}

/* ===== 数据看板 ===== */
.dashboard-section { background: var(--bg-soft); }
.dashboard-wrap { max-width: 1200px; margin: 0 auto; }
.dashboard-main-img {
  width: 100%; border-radius: 20px; box-shadow: var(--shadow-lg);
  margin-bottom: 36px;
}
.dashboard-charts { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 20px; }
.dchart {
  background: #fff; border-radius: 14px; padding: 22px;
  border: 1px solid var(--border); box-shadow: var(--shadow-sm);
}
.dchart h4 { font-size: 14px; font-weight: 600; color: var(--text-2); margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.dchart h4::before { content: ''; width: 4px; height: 14px; background: var(--primary); border-radius: 2px; }
.dchart-box { width: 100%; height: 200px; }

/* ===== 客户案例 ===== */
.case-grid { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.case-card {
  background: #fff; border-radius: 16px; overflow: hidden;
  border: 1px solid var(--border); transition: all 0.4s;
}
.case-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }
.case-card img { width: 100%; height: 180px; object-fit: cover; display: block; }
.case-body { padding: 24px; }
.case-body h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.case-body p { font-size: 13px; color: var(--text-2); line-height: 1.7; margin-bottom: 14px; }
.case-tags { display: flex; flex-wrap: wrap; gap: 6px; }
.case-tag { padding: 4px 10px; background: var(--primary-light); border-radius: 4px; font-size: 11px; color: var(--primary); }

/* ===== CTA ===== */
.cta-section {
  position: relative; padding: 90px 5%; text-align: center;
  background: url('../images/control-center.jpg') center/cover no-repeat;
}
.cta-mask { position: absolute; inset: 0; background: linear-gradient(135deg, rgba(8,30,55,0.92), rgba(10,110,209,0.85)); }
.cta-inner { position: relative; z-index: 1; max-width: 700px; margin: 0 auto; color: #fff; }
.cta-inner h2 { font-size: 38px; font-weight: 900; margin-bottom: 16px; }
.cta-inner p { font-size: 16px; opacity: 0.85; margin-bottom: 36px; line-height: 1.8; }
.cta-btn {
  padding: 16px 40px; background: #fff; color: var(--primary);
  border: none; border-radius: 10px; font-size: 16px; font-weight: 700;
  cursor: pointer; transition: all 0.3s; display: inline-flex; align-items: center; gap: 8px;
}
.cta-btn:hover { transform: translateY(-2px); box-shadow: 0 12px 30px rgba(0,0,0,0.3); }

/* ===== Footer ===== */
.footer { background: #0a1628; color: rgba(255,255,255,0.7); padding: 60px 5% 28px; }
.footer-wrap { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand h3 { color: #fff; font-size: 20px; font-weight: 800; margin-bottom: 14px; display: flex; align-items: center; gap: 8px; }
.footer-brand p { font-size: 13px; line-height: 1.8; max-width: 280px; }
.footer-col h4 { color: #fff; font-size: 15px; font-weight: 600; margin-bottom: 18px; }
.footer-col ul { list-style: none; }
.footer-col li { margin-bottom: 10px; }
.footer-col a { color: rgba(255,255,255,0.6); text-decoration: none; font-size: 13px; transition: color 0.3s; }
.footer-col a:hover { color: #60a5fa; }
.footer-bottom {
  max-width: 1200px; margin: 0 auto; padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex; justify-content: space-between; font-size: 12px; color: rgba(255,255,255,0.4);
}

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-card { max-width: 480px; }
  .pain-wrap, .feature-row { grid-template-columns: 1fr; gap: 32px; }
  .feature-row.reverse .feature-img { order: 0; }
  .solution-grid, .dashboard-charts { grid-template-columns: 1fr 1fr; }
  .case-grid { grid-template-columns: 1fr 1fr; }
  .footer-wrap { grid-template-columns: 1fr 1fr; }
  .data-bar { gap: 40px; }
}
@media (max-width: 640px) {
  .nav-menu { display: none; }
  .hero h1 { font-size: 34px; }
  .section-title { font-size: 26px; }
  .solution-grid, .scene-grid, .dashboard-charts, .case-grid { grid-template-columns: 1fr; }
  .data-bar { gap: 24px; }
  .data-bar-num { font-size: 30px; }
  .footer-wrap { grid-template-columns: 1fr; }
  .hero-actions { flex-direction: column; }
}