/* ===== リセット・ベース ===== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#FAF3EC;--white:#FFFFFF;--accent:#C4956A;--accent-dark:#A0714F;
  --text:#3E2A1E;--text-light:#6B5244;--border:#E8D5C4;
  --shadow:0 4px 20px rgba(62,42,30,0.08);--radius:16px;
}
html{scroll-behavior:smooth;scroll-padding-top:80px}
body{font-family:'Noto Sans JP',sans-serif;background:var(--bg);color:var(--text);line-height:1.8;overflow-x:hidden}
a{color:inherit;text-decoration:none}
ul{list-style:none}

/* ===== ナビゲーション ===== */
.navbar{position:fixed;top:0;left:0;width:100%;background:rgba(255,255,255,0.92);backdrop-filter:blur(12px);z-index:1000;transition:box-shadow .3s}
.navbar.scrolled{box-shadow:0 2px 16px rgba(62,42,30,0.1)}
.nav-inner{max-width:1100px;margin:0 auto;padding:0 24px;display:flex;align-items:center;justify-content:space-between;height:68px}
.nav-logo{font-size:1.2rem;font-weight:700;color:var(--accent-dark);letter-spacing:.5px}
.nav-logo span{color:var(--accent)}
.nav-links{display:flex;gap:28px}
.nav-links a{font-size:.92rem;font-weight:500;color:var(--text-light);position:relative;transition:color .3s}
.nav-links a::after{content:'';position:absolute;bottom:-4px;left:0;width:0;height:2px;background:var(--accent);border-radius:2px;transition:width .3s}
.nav-links a:hover,.nav-links a.active{color:var(--accent-dark)}
.nav-links a.active::after{width:100%}
.hamburger{display:none;flex-direction:column;gap:5px;cursor:pointer;padding:8px;background:none;border:none}
.hamburger span{display:block;width:24px;height:2.5px;background:var(--accent-dark);border-radius:2px;transition:all .3s}
.hamburger.open span:nth-child(1){transform:rotate(45deg) translate(5px,5px)}
.hamburger.open span:nth-child(2){opacity:0}
.hamburger.open span:nth-child(3){transform:rotate(-45deg) translate(5px,-5px)}

/* ===== ヒーローセクション ===== */
.hero{min-height:100vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:120px 24px 80px;position:relative;overflow:hidden}
.hero::before{content:'';position:absolute;top:-60px;right:-60px;width:320px;height:320px;background:radial-gradient(circle,rgba(196,149,106,0.15),transparent 70%);border-radius:50%;animation:float 8s ease-in-out infinite}
.hero::after{content:'';position:absolute;bottom:-40px;left:-40px;width:240px;height:240px;background:radial-gradient(circle,rgba(196,149,106,0.1),transparent 70%);border-radius:50%;animation:float 6s ease-in-out infinite reverse}
@keyframes float{0%,100%{transform:translateY(0)}50%{transform:translateY(-20px)}}
.hero-content{position:relative;z-index:1}
.hero h1{font-size:clamp(2.5rem,6vw,4rem);font-weight:700;color:var(--accent-dark);margin-bottom:0;letter-spacing:2px}
.hero-buttons{display:flex;gap:20px;justify-content:center;flex-wrap:wrap;margin-top:40px}
.btn{display:inline-block;padding:14px 36px;border-radius:40px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .3s;border:none}
.btn-primary{background:var(--accent);color:var(--white);box-shadow:0 4px 16px rgba(196,149,106,0.35)}
.btn-primary:hover{background:var(--accent-dark);transform:translateY(-2px);box-shadow:0 6px 24px rgba(160,113,79,0.4)}

/* ===== セクション共通 ===== */
section{padding:80px 24px}
.section-inner{max-width:1100px;margin:0 auto}
.section-title{text-align:center;font-size:clamp(1.4rem,3vw,1.8rem);font-weight:700;color:var(--accent-dark);margin-bottom:12px}
.section-subtitle{text-align:center;font-size:.92rem;color:var(--text-light);margin-bottom:48px}

/* ===== 参加方法 ===== */
.join{background:var(--white)}
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:28px;margin-bottom:40px}
.step-card{background:var(--bg);border-radius:var(--radius);padding:32px 24px;text-align:center;transition:transform .3s,box-shadow .3s}
.step-card:hover{transform:translateY(-6px);box-shadow:var(--shadow)}
.step-num{display:inline-flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:50%;background:var(--accent);color:var(--white);font-weight:700;font-size:1.1rem;margin-bottom:16px}
.step-card h3{font-size:1rem;margin-bottom:10px;color:var(--accent-dark)}
.step-card p{font-size:.88rem;color:var(--text-light);line-height:1.8}
.address-box{background:var(--bg);border-radius:var(--radius);padding:24px 32px;display:flex;align-items:center;justify-content:center;gap:16px;flex-wrap:wrap;max-width:520px;margin:0 auto;border:2px dashed var(--border)}
.address-box code{font-size:1.15rem;font-weight:600;color:var(--accent-dark);letter-spacing:1px}
.copy-btn{padding:10px 20px;border-radius:24px;border:2px solid var(--accent);background:var(--white);color:var(--accent-dark);font-weight:600;cursor:pointer;transition:all .3s;font-size:.88rem}
.copy-btn:hover{background:var(--accent);color:var(--white)}
.copy-btn.copied{background:var(--accent-dark);color:var(--white);border-color:var(--accent-dark)}

/* ===== ルール ===== */
.rules-grid{display:grid;gap:28px}
.rule-card{background:var(--white);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow);transition:transform .3s;border-left:4px solid var(--accent)}
.rule-card:hover{transform:translateY(-4px)}
.rule-card h3{font-size:1.15rem;color:var(--accent-dark);margin-bottom:8px;display:flex;align-items:center;gap:8px}
.rule-num{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:50%;background:var(--accent);color:var(--white);font-weight:700;font-size:.85rem;flex-shrink:0}
.rule-category{font-size:1.05rem;font-weight:700;color:var(--accent-dark);margin-bottom:20px;padding-bottom:12px;border-bottom:2px solid var(--border);display:flex;align-items:center;gap:10px}
.rule-section{margin-bottom:24px}
.rule-section:last-child{margin-bottom:0}
.rule-section h4{font-size:.98rem;font-weight:600;color:var(--accent);margin-bottom:10px}
.rule-section ul{padding-left:8px}
.rule-section li{font-size:.88rem;color:var(--text-light);line-height:1.9;padding-left:16px;position:relative}
.rule-section li::before{content:'•';color:var(--accent);position:absolute;left:0;font-weight:700}
.rule-note{background:var(--bg);border-radius:12px;padding:16px 20px;margin-top:16px;font-size:.9rem;color:var(--accent-dark);font-weight:500;text-align:center}

/* ===== 波型セクション区切り ===== */
.wave-divider{width:100%;overflow:hidden;line-height:0}
.wave-divider svg{display:block;width:100%}
.wave-divider.flip{transform:scaleY(-1)}

/* ===== コミュニティ ===== */
.community{background:var(--white)}
.community-buttons{display:flex;gap:24px;justify-content:center;flex-wrap:wrap}
.community-btn{display:inline-flex;align-items:center;gap:12px;padding:18px 36px;border-radius:var(--radius);font-size:1rem;font-weight:600;transition:all .3s;min-width:240px;justify-content:center}
.community-btn:hover{transform:translateY(-3px)}
.btn-youtube{background:linear-gradient(135deg,#c0392b,var(--accent-dark));color:var(--white);box-shadow:0 4px 16px rgba(192,57,43,0.25)}
.btn-youtube:hover{box-shadow:0 6px 24px rgba(192,57,43,0.35)}
.btn-discord{background:linear-gradient(135deg,#5865F2,var(--accent-dark));color:var(--white);box-shadow:0 4px 16px rgba(88,101,242,0.25)}
.btn-discord:hover{box-shadow:0 6px 24px rgba(88,101,242,0.35)}

/* ===== フッター ===== */
footer{background:var(--accent-dark);color:rgba(255,255,255,0.85);padding:48px 24px 28px;text-align:center}
.footer-inner{max-width:1100px;margin:0 auto}
.footer-logo{font-size:1.2rem;font-weight:700;color:var(--white);margin-bottom:16px}
.footer-links{display:flex;gap:24px;justify-content:center;flex-wrap:wrap;margin-bottom:24px}
.footer-links a{font-size:.88rem;transition:color .3s}
.footer-links a:hover{color:var(--white)}
.footer-copy{font-size:.78rem;opacity:.6}

/* ===== アニメーション ===== */
.fade-up{opacity:0;transform:translateY(28px);transition:opacity .7s ease,transform .7s ease}
.fade-up.visible{opacity:1;transform:translateY(0)}

/* ===== レスポンシブ ===== */
@media(max-width:768px){
  .nav-links{position:fixed;top:68px;left:0;width:100%;background:rgba(255,255,255,0.97);backdrop-filter:blur(12px);flex-direction:column;align-items:center;padding:24px 0;gap:20px;transform:translateY(-120%);transition:transform .4s ease;box-shadow:0 4px 16px rgba(62,42,30,0.08)}
  .nav-links.open{transform:translateY(0)}
  .hamburger{display:flex}
  .steps{grid-template-columns:1fr}
  .community-btn{width:100%;max-width:320px}
}
@media(max-width:480px){
  .address-box{flex-direction:column;text-align:center}
  .rule-card{padding:24px 18px}
}

/* ===== サブページ用の追加スタイル ===== */
body.subpage {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
body.subpage section.subpage-content {
  flex: 1;
  padding-top: 120px;
  padding-bottom: 80px;
}
.steps-2 {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px;
  margin-bottom: 40px;
}
@media(max-width:768px){
  .steps-2 {
    grid-template-columns: 1fr;
  }
}