:root{
  --blue:#4a9eff;
  --blue-dark:#3d8ce6;
  --blue-glow:rgba(74,158,255,0.4);
  --light-blue:#1a3a5c;
  --bg:#0a1628;
  --text:#e8f1fa;
  --muted:#8aa4c0;
  --card:#0f2540;
  --card-hover:#132d4a;
  --radius:12px;
  --container:980px;
  --gradient-accent:linear-gradient(135deg, #4a9eff 0%, #7c3aed 100%);

  /* ロゴサイズ */
  --logo-size:48px;           /* ヘッダーのロゴ*/
  --hero-logo-size:80px;      /* ヒーロー内のロゴ */
  --logo-size-sm:28px;        /* ヘッダーのロゴ（モバイル ）*/
  --hero-logo-size-sm:56px;   /* ヒーロー内のロゴ（モバイル） */
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  min-height:100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Hiragino Kaku Gothic ProN", "Noto Sans JP", "Yu Gothic", "Meiryo", sans-serif;
  background: linear-gradient(180deg,#0a1628 0%, #0d1f35 40%, #0a1628 100%);
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  line-height:1.6;
}

/* 背景のエフェクト */
body::before{
  content:'';
  position:fixed;
  top:0;left:0;right:0;bottom:0;
  background-image:
    radial-gradient(2px 2px at 20px 30px, rgba(74,158,255,0.3), transparent),
    radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.15), transparent),
    radial-gradient(1px 1px at 90px 40px, rgba(74,158,255,0.2), transparent),
    radial-gradient(2px 2px at 130px 80px, rgba(255,255,255,0.1), transparent),
    radial-gradient(1px 1px at 160px 120px, rgba(74,158,255,0.25), transparent);
  background-size:200px 200px;
  animation:twinkle 8s ease-in-out infinite alternate;
  pointer-events:none;
  z-index:-1;
}
@keyframes twinkle{
  0%{opacity:0.5}
  100%{opacity:1}
}
.skip-link{position:absolute;top:-40px;left:8px;background:var(--blue);color:#fff;padding:8px 12px;border-radius:8px;box-shadow:0 6px 18px rgba(0,20,50,0.4);transition:top .2s ease;z-index:100}
.skip-link:focus-visible{top:8px;outline:2px solid #fff;outline-offset:2px}
.container{width:min(100% - 40px,var(--container));margin-inline:auto}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:flex;align-items:center;gap:12px;font-weight:700;text-decoration:none;color:var(--text);transition:transform 0.2s ease}
.brand:hover{transform:scale(1.02)}
.logo{width:40px;height:40px;border-radius:8px;background:linear-gradient(180deg,#1a3a5c,#0f2540);display:flex;align-items:center;justify-content:center;font-weight:700;color:var(--blue);font-size:18px;box-shadow:inset 0 1px 0 rgba(255,255,255,0.1)}
.brand-text{font-size:16px}
.site-header{position:sticky;top:0;z-index:50;background:rgba(10,22,40,0.95);backdrop-filter:blur(12px);border-bottom:1px solid rgba(74,158,255,0.15);transition:background 0.3s ease}
.nav-links{display:flex;gap:18px;align-items:center}
.nav-links a{color:var(--muted);font-size:14px;text-decoration:none;position:relative;padding:4px 0;transition:color 0.2s ease}
.nav-links a::after{content:'';position:absolute;bottom:0;left:0;width:0;height:2px;background:var(--blue);transition:width 0.3s ease}
.nav-links a:hover{color:var(--blue)}
.nav-links a:hover::after{width:100%}
.menu-btn{display:none;background:transparent;border:0;color:var(--text);font-size:22px;cursor:pointer;transition:transform 0.2s ease}
.menu-btn:hover{transform:scale(1.1)}

/* ボタンスタイル強化 */
.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:10px;border:0;cursor:pointer;text-decoration:none;font-weight:600;font-size:14px;transition:all 0.3s ease;position:relative;overflow:hidden}
.btn::before{content:'';position:absolute;top:0;left:-100%;width:100%;height:100%;background:linear-gradient(90deg,transparent,rgba(255,255,255,0.2),transparent);transition:left 0.5s ease}
.btn:hover::before{left:100%}
.btn-discord{background:linear-gradient(135deg,#5865f2,#4752c4);color:#fff;box-shadow:0 4px 15px rgba(88,101,242,0.3)}
.btn-discord:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(88,101,242,0.4)}
.btn-line{background:linear-gradient(135deg,#00c300,#00a000);color:#fff;box-shadow:0 4px 15px rgba(0,195,0,0.3)}
.btn-line:hover{transform:translateY(-2px);box-shadow:0 6px 20px rgba(0,195,0,0.4)}
.btn-ghost{border:1px solid rgba(74,158,255,0.3);background:transparent;color:var(--blue);padding:10px 16px;border-radius:999px}
.btn-ghost:hover{background:rgba(74,158,255,0.1);border-color:var(--blue)}
.btn.secondary{background:rgba(74,158,255,0.1);border:1px solid rgba(74,158,255,0.3);color:var(--blue)}
.btn.secondary:hover{background:rgba(74,158,255,0.2);transform:translateY(-2px)}
/* ヒーローカード */
.hero-card{background:var(--card);border-radius:var(--radius);box-shadow:0 10px 40px rgba(0,15,40,0.5);padding:32px;display:flex;gap:28px;align-items:center;flex-wrap:wrap;margin-top:18px;border:1px solid rgba(74,158,255,0.15);position:relative;overflow:hidden;animation:fadeInUp 0.6s ease-out}
.hero-card::before{content:'';position:absolute;top:-50%;left:-50%;width:200%;height:200%;background:radial-gradient(circle,rgba(74,158,255,0.05) 0%,transparent 70%);animation:rotate 20s linear infinite}
@keyframes rotate{from{transform:rotate(0deg)}to{transform:rotate(360deg)}}
.hero-content{flex:1;min-width:220px;position:relative;z-index:1}
.title{font-size:26px;margin:0 0 10px;background:linear-gradient(135deg,var(--text) 0%,var(--blue) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.subtitle{color:var(--muted);margin:0 0 18px;font-size:15px;line-height:1.7}
.actions{display:flex;gap:12px;flex-wrap:wrap}

/* フェードインアニメーション */
@keyframes fadeInUp{
  from{opacity:0;transform:translateY(30px)}
  to{opacity:1;transform:translateY(0)}
}
@keyframes fadeIn{
  from{opacity:0}
  to{opacity:1}
}

/* スクロールアニメーション用 */
.fade-in{opacity:0;transform:translateY(20px);transition:opacity 0.6s ease,transform 0.6s ease}
.fade-in.visible{opacity:1;transform:translateY(0)}

main{max-width:980px;margin:24px auto;padding:8px 20px 60px}
.section{margin-top:40px;padding:16px 0}
.section h2{position:relative;display:inline-block;margin-bottom:8px}
.section h2::after{content:'';position:absolute;bottom:-4px;left:0;width:60px;height:3px;background:var(--gradient-accent);border-radius:2px}
.lead{color:var(--muted);margin:12px 0 20px;line-height:1.7}

/* カードグリッド強化 */
.features{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:18px}
.card{background:var(--card);border-radius:12px;padding:20px;box-shadow:0 8px 24px rgba(0,15,40,0.3);border:1px solid rgba(74,158,255,0.1);transition:all 0.3s ease;position:relative;overflow:hidden}
.card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px;background:var(--gradient-accent);transform:scaleX(0);transform-origin:left;transition:transform 0.3s ease}
.card:hover{transform:translateY(-5px);box-shadow:0 12px 32px rgba(0,15,40,0.4);border-color:rgba(74,158,255,0.25);background:var(--card-hover)}
.card:hover::before{transform:scaleX(1)}
.card h3{margin:0 0 10px;color:var(--text);font-size:17px;display:flex;align-items:center;gap:8px}
.desc{color:var(--muted);margin:0;font-size:14px;line-height:1.6}

/* アイコン付きカード */
.card-icon{width:40px;height:40px;border-radius:10px;background:rgba(74,158,255,0.1);display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:20px}

footer{max-width:980px;margin:60px auto 40px;padding:30px 20px;color:var(--muted);font-size:14px;text-align:center;border-top:1px solid rgba(74,158,255,0.1)}
footer p{margin:4px 0}

.logo-img{width:var(--logo-size);height:var(--logo-size);border-radius:8px;object-fit:cover;display:inline-block;transition:transform 0.3s ease}
.logo-img:hover{transform:scale(1.05)}
.hero-logo{width:var(--hero-logo-size);height:var(--hero-logo-size);border-radius:12px;flex:0 0 var(--hero-logo-size);box-shadow:0 8px 24px rgba(0,20,50,0.4),inset 0 1px 0 rgba(255,255,255,0.1);background:linear-gradient(180deg,#1a3a5c,#0f2540);display:flex;align-items:center;justify-content:center;animation:float 3s ease-in-out infinite;position:relative;z-index:1}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-8px)}}

img{max-width:100%;height:auto;display:block}

.title{font-size:clamp(20px, 3.5vw, 28px)}
.section h2{font-size:clamp(22px, 4vw, 32px)}
.lead{font-size:clamp(14px, 2.2vw, 16px)}

/* サーバーアドレスコピー機能 */
.server-address{display:inline-flex;align-items:center;gap:8px;background:rgba(74,158,255,0.1);padding:8px 14px;border-radius:8px;font-family:monospace;font-size:14px;color:var(--blue);cursor:pointer;transition:all 0.2s ease;border:1px solid rgba(74,158,255,0.2)}
.server-address:hover{background:rgba(74,158,255,0.15);border-color:rgba(74,158,255,0.4)}
.server-address .copy-icon{opacity:0.6;transition:opacity 0.2s}
.server-address:hover .copy-icon{opacity:1}

/* トースト通知 */
.toast{position:fixed;bottom:30px;left:50%;transform:translateX(-50%) translateY(100px);background:var(--card);color:var(--text);padding:14px 24px;border-radius:10px;box-shadow:0 8px 30px rgba(0,15,40,0.5);border:1px solid rgba(74,158,255,0.2);z-index:1000;opacity:0;transition:all 0.3s ease}
.toast.show{transform:translateX(-50%) translateY(0);opacity:1}
.toast.success{border-color:rgba(0,195,0,0.4)}

/* トップへ戻るボタン */
.back-to-top{position:fixed;bottom:30px;right:30px;width:48px;height:48px;border-radius:50%;background:var(--card);border:1px solid rgba(74,158,255,0.2);color:var(--blue);font-size:20px;cursor:pointer;opacity:0;visibility:hidden;transition:all 0.3s ease;display:flex;align-items:center;justify-content:center;box-shadow:0 4px 15px rgba(0,15,40,0.4)}
.back-to-top.visible{opacity:1;visibility:visible}
.back-to-top:hover{background:rgba(74,158,255,0.1);transform:translateY(-3px)}

/* オンラインステータス表示 */
.status-badge{display:inline-flex;align-items:center;gap:6px;padding:6px 12px;background:rgba(0,195,0,0.1);border:1px solid rgba(0,195,0,0.3);border-radius:20px;font-size:13px;color:#00c300}
.status-dot{width:8px;height:8px;border-radius:50%;background:#00c300;animation:pulse 2s infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:0.5}}

.logo-img{
  width: clamp(var(--logo-size-sm), 6.5vw, var(--logo-size));
  height: auto;
  max-height: var(--logo-size);
  border-radius:8px;object-fit:cover;display:inline-block
}
.hero-logo{
  width: clamp(var(--hero-logo-size-sm), 18vw, var(--hero-logo-size));
  height: auto;
  max-height: var(--hero-logo-size);
  border-radius:12px;flex:0 0 auto;box-shadow:0 8px 24px rgba(0,20,50,0.4),inset 0 1px 0 rgba(255,255,255,0.1);background:linear-gradient(180deg,#1a3a5c,#0f2540);display:flex;align-items:center;justify-content:center;animation:float 3s ease-in-out infinite
}

/* FAQ アコーディオン */
.faq-item{background:var(--card);border-radius:12px;border:1px solid rgba(74,158,255,0.1);overflow:hidden;margin-bottom:12px;transition:border-color 0.3s ease}
.faq-item:hover{border-color:rgba(74,158,255,0.25)}
.faq-question{width:100%;padding:18px 20px;background:transparent;border:none;color:var(--text);font-size:16px;font-weight:600;text-align:left;cursor:pointer;display:flex;align-items:center;justify-content:space-between;gap:12px;transition:background 0.2s ease}
.faq-question:hover{background:rgba(74,158,255,0.05)}
.faq-icon{font-size:18px;color:var(--blue);transition:transform 0.3s ease}
.faq-item.open .faq-icon{transform:rotate(180deg)}
.faq-answer{max-height:0;overflow:hidden;transition:max-height 0.3s ease,padding 0.3s ease}
.faq-item.open .faq-answer{max-height:200px}
.faq-answer p{padding:0 20px 18px;margin:0;color:var(--muted);line-height:1.7}

.hero-card{display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:flex-start}
@media (max-width:900px){
  .hero-card{justify-content:center}
}
@media (max-width:720px){
  .hero-card{flex-direction:column;align-items:center;text-align:center;padding:18px}
  .hero-content{width:100%}
  .actions{justify-content:center}
}

@media (max-width:520px){
  .features{grid-template-columns:1fr}
}

@media (max-width:720px){
  .nav-links{display:none;position:absolute;right:16px;top:64px;flex-direction:column;background:rgba(15,37,64,0.98);border:1px solid rgba(74,158,255,0.2);border-radius:12px;padding:12px;width:calc(100% - 32px);gap:8px;animation:slideDown 0.2s ease}
  @keyframes slideDown{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:translateY(0)}}
  .nav-links.show{display:flex}
  .nav-links a{padding:10px 12px;border-radius:8px}
  .nav-links a:hover{background:rgba(74,158,255,0.1)}
  .nav-links a::after{display:none}
  .menu-btn{display:inline-flex}
  .hero-card{padding:20px}
  .logo{width:56px;height:56px;font-size:16px}
  .title{font-size:20px}
  .back-to-top{bottom:20px;right:20px;width:44px;height:44px}
}

@media (max-width:520px){
  .logo-img{width:var(--logo-size-sm);height:var(--logo-size-sm)}
  .hero-logo{width:var(--hero-logo-size-sm);height:var(--hero-logo-size-sm);flex:0 0 var(--hero-logo-size-sm)}
}

@media (prefers-reduced-motion: reduce){*{animation:none!important;transition:none!important}}