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

body{
  font-family:Arial,sans-serif;
  background:#f4f7fb;
  color:#111827;
  line-height:1.7;
}

.container{
  width:100%;
  max-width:1280px;
  margin:auto;
  padding:0 24px;
}

/* ================= HERO ================= */

.hero{
  background:linear-gradient(135deg,#0f172a,#111827,#000);
  padding:70px 0;
}

.hero-text{
  color:white;
  max-width:900px;
  margin-bottom:30px;
}

.tag{
  display:inline-block;
  padding:8px 16px;
  border:1px solid rgba(255,255,255,0.2);
  border-radius:999px;
  font-size:12px;
  letter-spacing:2px;
  text-transform:uppercase;
  margin-bottom:18px;
  background:rgba(255,255,255,0.05);
  color:#cbd5e1;
}

.hero h1{
  font-size:56px;
  line-height:1.05;
  margin-bottom:18px;
}

.hero p{
  font-size:18px;
  color:#d1d5db;
  max-width:650px;
}

/* HERO IMAGE */
.hero-media{
  width:100%;
  max-width:1200px;
  margin:auto;
  border-radius:28px;
  overflow:hidden;
  box-shadow:0 20px 70px rgba(0,0,0,0.35);

  aspect-ratio: 1200 / 650;
}

.hero-media img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

/* ================= SECTION ================= */

.section{
  padding:100px 0;
}

.card-section{
  background:white;
  border-radius:40px;
  padding:60px;
  border:1px solid #e5e7eb;
  box-shadow:0 20px 80px rgba(15,23,42,0.08);
}

.intro-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:70px;
  align-items:center;
}

.section-title{
  font-size:48px;
  margin-bottom:28px;
  line-height:1.15;
}

.section-text{
  color:#4b5563;
  font-size:18px;
  margin-bottom:20px;
}

/* ================= FIXED IMAGE SYSTEM ================= */

/* INTRO IMAGE（已修复） */
.intro-image{
  background:linear-gradient(to bottom right,#f8fafc,#e2e8f0);
  border-radius:32px;
  border:1px solid #d1d5db;
  overflow:hidden;

  aspect-ratio: 4 / 5;
}

.intro-image img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}

/* PRODUCT IMAGE */
.product-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:32px;
}

.product-card{
  background:white;
  border-radius:32px;
  overflow:hidden;
  border:1px solid #e5e7eb;
  box-shadow:0 10px 40px rgba(15,23,42,0.06);
}

.product-image{
  aspect-ratio: 1 / 1;
  display:flex;
  align-items:center;
  justify-content:center;
  background:#f8fafc;
}

.product-image img{
  width:100%;
  height:100%;
  object-fit:contain;
}

.product-name{
  padding:20px;
  text-align:center;
  font-size:18px;
  font-weight:600;
}

/* FEATURE */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:28px;
}

.feature-card{
  background:white;
  border-radius:32px;
  padding:40px;
  border:1px solid #e5e7eb;
  box-shadow:0 10px 40px rgba(15,23,42,0.06);
}

.feature-number{
  width:56px;
  height:56px;
  background:#f1f5f9;
  border-radius:16px;
  display:flex;
  align-items:center;
  justify-content:center;
  margin-bottom:20px;
  font-weight:bold;
}

/* DARK SECTION */
.dark-section{
  background:linear-gradient(135deg,#111827,#1e293b);
  border-radius:40px;
  padding:70px;
  color:white;
}

.dark-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:70px;
  align-items:center;
}

.dark-image{
  border-radius:32px;
  overflow:hidden;
  aspect-ratio: 9 / 6;
  border:1px solid rgba(255,255,255,0.1);
}

.dark-image img{
  width:100%;
  height:100%;
  object-fit:cover;
}

/* APPLICATION */
.app-grid{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:24px;
}

.app-card{
  background:white;
  border-radius:28px;
  padding:40px 20px;
  text-align:center;
  font-size:20px;
  font-weight:600;
  border:1px solid #e5e7eb;
}

/* OEM */
.oem-box{
  background:white;
  border-radius:40px;
  padding:70px;
  border:1px solid #e5e7eb;
  text-align:center;
}

/* ================= RESPONSIVE ================= */

@media(max-width:1024px){
  .intro-grid,
  .dark-grid,
  .product-grid,
  .feature-grid,
  .app-grid{
    grid-template-columns:1fr 1fr;
  }

  .hero h1{
    font-size:46px;
  }
}

@media(max-width:768px){
  .intro-grid,
  .dark-grid,
  .product-grid,
  .feature-grid,
  .app-grid{
    grid-template-columns:1fr;
  }

  .hero h1{
    font-size:34px;
  }

  .section-title{
    font-size:32px;
  }

  .card-section,
  .dark-section,
  .oem-box{
    padding:30px 20px;
  }
}