:root{
  --sy-brand:#00B900;
  --sy-brand-dark:#009900;
  --sy-dark:#111111;
  --sy-gray:#666666;
  --sy-bg-light:#F5F7FA;
  --sy-bg-white:#FFFFFF;
  --sy-border:#E1E4E8;
  --sy-accent:#3B82F6; /* Blue accent for 'sync' feeling */
}
*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Hiragino Sans","Meiryo",sans-serif;background-color:var(--sy-bg-light);color:var(--sy-dark);line-height:1.7;font-size:16px;letter-spacing:0.02em}
a{text-decoration:none;color:inherit;transition:all 0.3s ease}
ul,li{list-style:none}
img{max-width:100%;height:auto;display:block}

/* Header - Modern & Clean */
.header{background:var(--sy-bg-white);border-bottom:1px solid var(--sy-border);position:sticky;top:0;z-index:100;box-shadow:0 2px 10px rgba(0,0,0,0.02)}
.header-inner{max-width:1100px;margin:0 auto;padding:16px 24px;display:flex;justify-content:space-between;align-items:center}
.logo{font-size:24px;font-weight:800;color:var(--sy-brand);display:flex;align-items:center;letter-spacing:-0.5px}
.nav-menu{display:flex;gap:24px;overflow-x:auto}
.nav-menu a{font-size:14px;font-weight:600;color:var(--sy-gray);padding:8px 0;white-space:nowrap;position:relative}
.nav-menu a:hover, .nav-menu a.active{color:var(--sy-brand)}
.nav-menu a.active::after{content:'';position:absolute;bottom:-17px;left:0;width:100%;height:3px;background:var(--sy-brand);border-radius:3px 3px 0 0}

/* Hero Section (Focus on Phone <-> PC Sync) */
.hero{background:linear-gradient(135deg, #ffffff 0%, #f0f7f4 100%);padding:70px 24px;border-bottom:1px solid var(--sy-border);overflow:hidden}
.hero-inner{max-width:1100px;margin:0 auto;display:flex;align-items:center;gap:50px;position:relative}
.hero-text{flex:1.2;position:relative;z-index:2}
.hero-badge{display:inline-block;background:var(--sy-accent);color:#fff;padding:6px 14px;border-radius:30px;font-size:12px;font-weight:700;margin-bottom:20px;letter-spacing:1px;box-shadow:0 4px 10px rgba(59,130,246,0.3)}
.hero-title{font-size:38px;font-weight:800;line-height:1.4;margin-bottom:24px;color:var(--sy-dark);letter-spacing:-1px}
.hero-desc{font-size:16px;color:var(--sy-gray);margin-bottom:32px;line-height:1.8}
.btn-primary{display:inline-block;background:var(--sy-brand);color:#FFFFFF;padding:18px 48px;border-radius:8px;font-size:18px;font-weight:700;box-shadow:0 6px 15px rgba(0,185,0,0.25)}
.btn-primary:hover{background:var(--sy-brand-dark);transform:translateY(-2px);box-shadow:0 8px 20px rgba(0,185,0,0.35);color:#fff}
.hero-visual{flex:1;position:relative;z-index:1}
/* Simulating a Phone/PC overlap look */
.hero-visual img{border-radius:12px;box-shadow:0 20px 40px rgba(0,0,0,0.1);border:4px solid #fff;transform:perspective(1000px) rotateY(-5deg)}

/* Announcement */
.announcement{max-width:1100px;margin:40px auto 0;padding:0 24px}
.ann-box{background:var(--sy-bg-white);border-left:4px solid var(--sy-accent);padding:16px 24px;border-radius:0 6px 6px 0;display:flex;gap:16px;align-items:center;box-shadow:0 2px 8px rgba(0,0,0,0.03)}
.ann-date{font-weight:700;color:var(--sy-accent);font-size:14px}
.ann-text{font-size:14px;color:var(--sy-dark);font-weight:500}

/* Content Container */
.container{max-width:1100px;margin:60px auto 0;padding:0 24px}
.sec-title{font-size:26px;font-weight:800;margin-bottom:40px;text-align:center;color:var(--sy-dark)}

/* Category Grid */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fit, minmax(240px, 1fr));gap:24px;margin-bottom:80px}
.cat-card{background:var(--sy-bg-white);border:1px solid var(--sy-border);padding:32px 24px;border-radius:12px;transition:0.3s;display:block}
.cat-card:hover{border-color:var(--sy-accent);box-shadow:0 10px 20px rgba(0,0,0,0.04);transform:translateY(-3px)}
.cat-icon{font-size:12px;font-weight:700;color:var(--sy-accent);background:rgba(59,130,246,0.1);padding:4px 10px;border-radius:4px;margin-bottom:16px;display:inline-block}
.cat-card h3{font-size:18px;font-weight:700;margin-bottom:12px;color:var(--sy-dark)}
.cat-card p{font-size:14px;color:var(--sy-gray);line-height:1.6}

/* Feature Details (Showcasing Sync) */
.feature{display:flex;align-items:center;gap:50px;background:var(--sy-bg-white);padding:50px;border-radius:16px;margin-bottom:80px;border:1px solid var(--sy-border);box-shadow:0 4px 24px rgba(0,0,0,0.02)}
.feat-text{flex:1}
.feat-text h2{font-size:24px;font-weight:800;margin-bottom:20px;color:var(--sy-dark)}
.feat-text p{font-size:15px;color:var(--sy-gray);margin-bottom:16px;line-height:1.8}
.feat-img{flex:1}
.feat-img img{border-radius:8px;box-shadow:0 4px 12px rgba(0,0,0,0.05)}

/* Columns List */
.col-list{display:grid;grid-template-columns:repeat(3, 1fr);gap:24px;margin-bottom:80px}
.col-item{background:var(--sy-bg-white);border:1px solid var(--sy-border);border-radius:12px;overflow:hidden;transition:0.3s}
.col-item:hover{box-shadow:0 8px 24px rgba(0,0,0,0.06)}
.col-item img{width:100%;height:180px;object-fit:cover;border-bottom:1px solid var(--sy-border)}
.col-text{padding:24px}
.col-text h4{font-size:16px;font-weight:700;margin-bottom:12px}
.col-text p{font-size:13px;color:var(--sy-gray)}

/* Support Panels */
.support-area{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:80px}
.sup-panel{background:var(--sy-bg-white);border:1px solid var(--sy-border);padding:40px;border-radius:12px;text-align:center}
.sup-panel h3{font-size:20px;font-weight:700;margin-bottom:16px}
.sup-panel p{font-size:14px;color:var(--sy-gray);margin-bottom:24px}
.btn-outline{display:inline-block;padding:14px 32px;border:2px solid var(--sy-dark);color:var(--sy-dark);border-radius:30px;font-size:14px;font-weight:700}
.btn-outline:hover{background:var(--sy-dark);color:var(--sy-bg-white)}

/* Footer */
.footer{background:var(--sy-bg-white);border-top:1px solid var(--sy-border);padding:60px 24px;text-align:center}
.foot-nav{display:flex;justify-content:center;gap:30px;margin-bottom:32px;flex-wrap:wrap}
.foot-nav a{font-size:14px;font-weight:600;color:var(--sy-dark)}
.foot-sub{display:flex;justify-content:center;gap:24px;margin-bottom:24px;flex-wrap:wrap}
.foot-sub a{font-size:13px;color:var(--sy-gray)}
.copyright{font-size:13px;color:#999}

@media(max-width:850px){
  .hero-inner, .feature, .col-list, .support-area{flex-direction:column;grid-template-columns:1fr}
  .hero{padding:50px 24px}
  .hero-title{font-size:32px}
  .nav-menu{display:none} /* Clean mobile view */
  .hero-visual img{transform:none}
}

img{height:auto}
.wrap,.news,.cols,.two,footer{content-visibility:auto;contain-intrinsic-size:auto 520px}