:root{
  --dl-green:#06C755;
  --dl-green-dark:#05b34c;
  --dl-bg:#F5F7FA;
  --dl-card:#FFFFFF;
  --dl-text:#2C3E50;
  --dl-muted:#7F8C8D;
  --dl-border:#E1E8ED;
  --dl-win:#0078D7;
  --dl-mac:#333333;
}
*{box-sizing:border-box}
body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Hiragino Sans","Yu Gothic",Meiryo,sans-serif;background:var(--dl-bg);color:var(--dl-text);line-height:1.6}
a{text-decoration:none;color:inherit;transition:0.2s}
img{max-width:100%;height:auto;display:block;border-radius:8px}

/* Header */
.site-header{background:var(--dl-card);border-bottom:1px solid var(--dl-border);position:sticky;top:0;z-index:100;box-shadow:0 1px 2px rgba(0,0,0,0.03)}
.header-inner{max-width:1200px;margin:0 auto;padding:16px 24px;display:flex;justify-content:space-between;align-items:center}
.site-logo{font-size:24px;font-weight:900;color:var(--dl-green);display:flex;align-items:center;gap:8px;letter-spacing:-1px}
.site-logo::before{content:"";display:block;width:24px;height:24px;background:var(--dl-green);border-radius:5px}
.main-nav{display:flex;gap:16px;overflow-x:auto}
.main-nav a{font-size:14px;font-weight:700;padding:8px 12px;border-radius:4px;color:var(--dl-muted)}
.main-nav a:hover, .main-nav a.active{background:rgba(6,199,85,0.1);color:var(--dl-green-dark)}

/* Hero Section OS Focus */
.hero{background:linear-gradient(135deg, #ffffff 0%, #f0f4f8 100%);padding:80px 24px;text-align:center;border-bottom:1px solid var(--dl-border)}
.hero-inner{max-width:900px;margin:0 auto}
.hero-tag{display:inline-block;background:var(--dl-green);color:#fff;font-size:13px;font-weight:800;padding:6px 16px;border-radius:20px;margin-bottom:20px}
.hero h1{font-size:clamp(30px, 4vw, 44px);margin:0 0 16px;font-weight:900;color:var(--dl-text)}
.hero p{font-size:16px;color:var(--dl-muted);margin:0 0 40px}

/* OS Buttons */
.os-buttons{display:flex;justify-content:center;gap:30px;flex-wrap:wrap;margin-bottom:40px}
.os-btn{display:flex;flex-direction:column;align-items:center;justify-content:center;width:260px;padding:30px 20px;background:var(--dl-card);border-radius:16px;box-shadow:0 10px 25px rgba(0,0,0,0.06);border:2px solid transparent;transition:all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275)}
.os-btn.win:hover{border-color:var(--dl-win);transform:translateY(-8px);box-shadow:0 15px 35px rgba(0,120,215,0.15)}
.os-btn.mac:hover{border-color:var(--dl-mac);transform:translateY(-8px);box-shadow:0 15px 35px rgba(51,51,51,0.15)}
.os-icon{font-size:48px;margin-bottom:12px;display:block}
.os-title{font-size:22px;font-weight:800;margin-bottom:6px;color:var(--dl-text)}
.os-desc{font-size:13px;color:var(--dl-muted);font-weight:600}
.hero-visual{max-width:800px;margin:0 auto;box-shadow:0 20px 40px rgba(0,0,0,0.1);border-radius:12px;border:1px solid var(--dl-border);overflow:hidden}

/* Main Container */
.container{max-width:1200px;margin:60px auto;padding:0 24px}
.sec-title{text-align:center;margin-bottom:48px}
.sec-title h2{font-size:26px;font-weight:800;color:var(--dl-text);margin:0 0 12px}
.sec-title p{font-size:15px;color:var(--dl-muted);margin:0}

/* Grid Categories */
.cat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:24px;margin-bottom:80px}
.cat-item{background:var(--dl-card);border:1px solid var(--dl-border);padding:32px 24px;border-radius:12px;text-align:center;transition:0.3s}
.cat-item:hover{border-color:var(--dl-green);box-shadow:0 10px 20px rgba(6,199,85,0.1);transform:translateY(-4px)}
.cat-label{font-size:12px;color:var(--dl-green-dark);font-weight:800;margin-bottom:12px;display:block}
.cat-item h3{font-size:18px;margin:0 0 12px;color:var(--dl-text);font-weight:700}
.cat-item p{font-size:14px;color:var(--dl-muted);margin:0}

/* Article Layout */
.article-section{display:flex;flex-wrap:wrap;gap:48px;background:var(--dl-card);border:1px solid var(--dl-border);border-radius:12px;padding:48px;align-items:center;margin-bottom:80px;box-shadow:0 4px 12px rgba(0,0,0,0.02)}
.art-text{flex:1;min-width:300px}
.art-text h3{font-size:24px;margin:0 0 20px;font-weight:800}
.art-text p{font-size:15px;margin-bottom:20px}
.art-img{flex:1;min-width:300px}

/* News List */
.news-area{max-width:900px;margin:0 auto 80px}
.news-list{background:var(--dl-card);border-radius:12px;border:1px solid var(--dl-border);overflow:hidden}
.news-item{display:flex;padding:20px 24px;border-bottom:1px solid var(--dl-border);align-items:center;gap:20px}
.news-item:last-child{border-bottom:none}
.news-date{color:var(--dl-muted);font-size:14px;width:100px}
.news-badge{background:#e8f4fd;color:#0078D7;font-size:12px;padding:4px 12px;border-radius:4px;font-weight:700}
.news-badge.update{background:#e8f9ee;color:var(--dl-green-dark)}
.news-title{font-size:15px;font-weight:600;color:var(--dl-text);flex:1}

/* Columns */
.col-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:32px;margin-bottom:80px}
.col-card{background:var(--dl-card);border:1px solid var(--dl-border);border-radius:12px;overflow:hidden;transition:0.3s}
.col-card:hover{box-shadow:0 12px 24px rgba(0,0,0,0.08);transform:translateY(-5px)}
.col-card img{width:100%;height:180px;object-fit:cover;border-radius:0;border-bottom:1px solid var(--dl-border)}
.col-body{padding:24px}
.col-body h4{font-size:17px;font-weight:700;margin:0 0 12px}
.col-body p{font-size:14px;color:var(--dl-muted);margin:0}

/* Support Actions */
.support-area{background:#E8F9EE;border:1px solid #c3eed3;border-radius:12px;padding:48px 24px;text-align:center;margin-bottom:80px}
.support-area h2{font-size:24px;color:var(--dl-green-dark);margin:0 0 16px;font-weight:800}
.support-area p{font-size:15px;color:var(--dl-text);margin:0 0 32px}
.btn-support-group{display:flex;justify-content:center;gap:16px;flex-wrap:wrap}
.btn-support{display:inline-block;padding:12px 28px;border-radius:30px;font-weight:700;font-size:15px;background:#fff;color:var(--dl-green-dark);border:2px solid var(--dl-green)}
.btn-support:hover{background:var(--dl-green);color:#fff}
.btn-business{display:inline-block;padding:12px 28px;border-radius:30px;font-weight:700;font-size:15px;background:var(--dl-text);color:#fff;border:2px solid var(--dl-text)}
.btn-business:hover{background:#000}

/* Footer */
.site-footer{background:var(--dl-card);border-top:1px solid var(--dl-border);padding:48px 24px;font-size:14px;text-align:center}
.footer-nav{display:flex;justify-content:center;gap:24px;flex-wrap:wrap;margin-bottom:32px;font-weight:600;color:var(--dl-muted)}
.footer-nav a:hover{color:var(--dl-green)}
.footer-links{display:flex;justify-content:center;gap:20px;flex-wrap:wrap;margin-bottom:20px;font-size:13px;color:#95a5a6}
.footer-links a:hover{text-decoration:underline}
.copy{color:#bdc3c7;font-size:13px}
@media(max-width:768px){
  .header-inner{flex-direction:column;align-items:flex-start;gap:16px}
  .main-nav{width:100%}
  .os-btn{width:100%}
  .news-row{flex-direction:column;align-items:flex-start;gap:12px}
}
img{height:auto}
.wrap,.news,.cols,.two,footer{content-visibility:auto;contain-intrinsic-size:auto 520px}