:root{--accent:#e5560a;--accent-hover:#c44a05;--bg:#eef1f5;--text:#1d2733;--text-dim:#5d6b7d;--panel:#ffffff;--border:#d8dfe9;--secondary:#3b6ea5;--secondary-hover:#315d8c;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--shadow-1:0 1px 2px rgba(23,32,46,.10),0 1px 3px rgba(23,32,46,.06);--shadow-2:0 4px 10px rgba(23,32,46,.14),0 2px 4px rgba(23,32,46,.08);--shadow-3:0 14px 34px rgba(23,32,46,.20),0 4px 10px rgba(23,32,46,.10);--ring:0 0 0 3px rgba(244,96,12,.22);--civ-light:#c9a83d;--civ-water:#3d7fd4;--civ-dark:#6d5494;--civ-fire:#e35d2b;--civ-nature:#4a9a52;--hero-bg:radial-gradient(ellipse at 50% 30%,#f8fafd 0%,#eaeef5 55%,#dfe6ef 100%);--hero-edge:#d3dbe6;--board-line:#e4e9f1;--footer-bg:#e7ebf1;--status-open:#3f8f55;--status-open-text:#2e7342;--status-wait:#d99a2b;--status-wait-text:#96660d;--status-busy:#97a2b2;--status-busy-text:#5d6b7d;--font-body:'Zen Kaku Gothic New','Segoe UI','Hiragino Sans',sans-serif;--font-num:'Oswald','Zen Kaku Gothic New',sans-serif}
    *{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:80px}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font-body);line-height:1.9;overflow-x:hidden}a{color:var(--secondary)}img{display:block;max-width:100%;height:auto}.civ-line{height:4px;background:linear-gradient(90deg,var(--civ-light) 0 20%,var(--civ-water) 20% 40%,var(--civ-dark) 40% 60%,var(--civ-fire) 60% 80%,var(--civ-nature) 80% 100%)}.container{width:min(100% - 64px,1040px);margin-inline:auto}.site-header{position:sticky;top:0;z-index:50;height:64px;background:rgba(255,255,255,.72);border-bottom:1px solid transparent;transition:background .2s,border-color .2s,backdrop-filter .2s}.site-header.scrolled{background:rgba(255,255,255,.92);border-color:var(--hero-edge);backdrop-filter:blur(8px)}.header-inner{height:100%;display:flex;align-items:center;justify-content:space-between;gap:24px}.wordmark{display:flex;align-items:baseline;gap:2px;color:var(--text);font-weight:700;text-decoration:none;font-size:1.25rem}.wordmark b{font-family:var(--font-num);font-weight:600}.header-nav{display:flex;align-items:center;gap:24px;margin-left:auto}.header-nav a,.footer a{color:var(--text-dim);text-decoration:none}.header-nav a:hover,.footer a:hover{color:var(--text);text-decoration:underline}.btn{display:inline-flex;align-items:center;justify-content:center;min-height:48px;padding:10px 24px;border:1px solid transparent;border-radius:var(--radius-md);font:700 1rem/1.3 var(--font-body);text-decoration:none;transition:transform .18s,box-shadow .18s,background .18s,border-color .18s,color .18s}.btn-primary{background:var(--accent);color:#fff}.btn-primary:hover{background:var(--accent-hover);box-shadow:var(--shadow-2);transform:translateY(-1px);text-decoration:none}.btn-ghost{background:var(--panel);border-color:var(--hero-edge);color:var(--text)}.btn-ghost:hover{border-color:var(--secondary);color:var(--secondary);text-decoration:none}.btn:focus-visible,a:focus-visible,summary:focus-visible{outline:none;box-shadow:var(--ring)}.header-cta{min-height:40px;padding:8px 16px;font-size:.88rem}
    @keyframes hero-in{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:translateY(0)}}.hero{position:relative;isolation:isolate;padding:96px 0 112px;background:var(--hero-bg);border-bottom:1px solid var(--hero-edge);overflow:hidden}.hero::before,.hero::after{content:'';position:absolute;z-index:-1;width:520px;height:520px;border-radius:50%;filter:blur(18px);pointer-events:none}.hero::before{left:-180px;top:-220px;background:radial-gradient(circle,rgba(61,127,212,.06),rgba(61,127,212,0) 68%)}.hero::after{right:-170px;bottom:-250px;background:radial-gradient(circle,rgba(227,93,43,.05),rgba(227,93,43,0) 68%)}.hero-orb{position:absolute;z-index:-1;left:50%;top:45%;width:420px;height:420px;border-radius:50%;filter:blur(20px);background:radial-gradient(circle,rgba(74,154,82,.04),rgba(74,154,82,0) 68%)}.hero-grid{display:grid;grid-template-columns:12fr 8fr;gap:48px;align-items:center}.hero-copy{animation:hero-in .28s cubic-bezier(.22,1,.36,1) both}.hero-visual{animation:hero-in .28s .06s cubic-bezier(.22,1,.36,1) both}.hero-copy h1{margin:0 0 24px;font-size:clamp(2rem,4.2vw,2.9rem);line-height:1.22;font-weight:900;letter-spacing:-.03em}.h1-br{display:inline}.hero-copy h1 em{color:var(--accent);font-style:normal}.lead{margin:0 0 32px;font-size:1.04rem}.hero-actions{display:flex;gap:12px}.hero-actions .btn-primary{min-height:56px}.microcopy{margin:12px 0 0;color:var(--text-dim);font-size:.8rem;line-height:1.7}.hero-visual{position:relative;padding-bottom:16px}
    .section{padding:96px 0}.section-white{background:var(--panel)}.section-heading{margin-bottom:40px}.section-heading.center{text-align:center}.eyebrow{display:flex;align-items:center;gap:10px;margin:0 0 8px;color:var(--secondary);font:600 .78rem var(--font-num);letter-spacing:.14em}.center .eyebrow{justify-content:center}.eyebrow::before{content:'';width:24px;height:3px;background:linear-gradient(90deg,var(--civ-water),var(--civ-fire),var(--civ-nature));border-radius:2px}.section-heading h2{margin:0;font-size:clamp(1.35rem,2.6vw,1.8rem);line-height:1.3}.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.step,.mode-card,.account-card{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-1)}.step{padding:28px 24px}.step-num{display:block;margin-bottom:12px;color:var(--secondary);font:600 .82rem var(--font-num);letter-spacing:.12em}.step h3{margin:0 0 12px;font-size:1.08rem}.step p,.mode-card p{margin:0;color:var(--text-dim);font-size:.92rem}.manual-note{margin:32px 0 0;padding:16px 20px;background:var(--bg);border-left:4px solid var(--secondary);border-radius:0 var(--radius-md) var(--radius-md) 0;font-size:.9rem}.modes{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.mode-card{position:relative;padding:28px 24px;border-top:3px solid var(--mode-color);transition:transform .18s,box-shadow .18s}.mode-card::before{content:'';position:absolute;top:22px;right:22px;width:8px;height:8px;border-radius:50%;background:var(--mode-color)}.mode-card:hover{transform:translateY(-3px);box-shadow:var(--shadow-2)}.mode-card h3{margin:0 0 12px;padding-right:20px}.mode-online{--mode-color:var(--accent);grid-column:1/-1;display:grid;grid-template-columns:1.3fr 1fr;gap:32px;align-items:center}.mode-online .badge{display:inline-flex;margin-left:8px;padding:3px 8px;border-radius:999px;background:var(--accent);color:#fff;font-size:.72rem;vertical-align:middle}.mode-flow{padding:20px;background:var(--bg);border-radius:var(--radius-md);color:var(--text);font:500 .9rem/1.8 var(--font-body);text-align:center}.mode-lobby{--mode-color:var(--civ-water)}.mode-vs{--mode-color:var(--civ-dark)}.mode-solo{--mode-color:var(--civ-nature)}.sp-proof{display:grid;grid-template-columns:1fr auto;gap:40px;align-items:center;margin-top:32px;padding:28px 32px;background:var(--bg);border-radius:var(--radius-lg)}.sp-proof strong{display:block;margin-bottom:6px}.sp-proof p{margin:0;color:var(--text-dim);font-size:.9rem}.sp-proof .shot-phone{width:230px;justify-self:center}
    .deck-layout{display:grid;grid-template-columns:4fr 6fr;gap:48px;align-items:center}.deck-copy>p{margin:0 0 24px}.feature-list{display:grid;gap:10px;margin:0;padding:0;list-style:none}.feature-list li{display:flex;align-items:center;gap:10px;font-weight:700}.feature-list li::before{content:'';width:8px;height:8px;border-radius:50%;background:var(--accent)}.device-cluster{position:relative;padding:0 0 16px 34px}.device-cluster .shot-browser{width:100%}.device-cluster .deck-phone{position:absolute;left:0;bottom:0;width:140px;z-index:2}.account-layout{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}.account-layout p{margin:0 0 16px}.account-note{color:var(--text-dim);font-size:.85rem}.account-card{padding:28px}.fake-label{display:block;margin:0 0 6px;font-size:.78rem;font-weight:700}.fake-input{height:48px;margin-bottom:14px;border:1px solid var(--border);border-radius:var(--radius-md);background:var(--bg)}.fake-button{display:flex;align-items:center;justify-content:center;height:44px;border-radius:var(--radius-md);background:var(--secondary);color:#fff;font-weight:700}.faq-list{display:grid;gap:12px}.faq-list details{background:var(--panel);border:1px solid var(--border);border-radius:var(--radius-md);box-shadow:var(--shadow-1)}.faq-list summary{padding:18px 52px 18px 20px;cursor:pointer;font-weight:700;list-style:none;position:relative}.faq-list summary::after{content:'+';position:absolute;right:20px;top:50%;transform:translateY(-50%);font:600 1.2rem var(--font-num);color:var(--secondary)}.faq-list details[open] summary::after{content:'−'}.faq-answer{margin:0;padding:0 20px 20px;color:var(--text-dim)}.disclaimer-wrap{padding:64px 0;background:var(--panel)}.disclaimer{margin:0;padding:24px;background:var(--bg);border:1px solid var(--border);border-radius:var(--radius-md);color:var(--text-dim);font-size:.85rem;text-align:center}.footer{background:var(--footer-bg);color:var(--text-dim);font-size:.85rem}.footer-main{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:36px;padding:48px 0 32px}.footer-brand p{margin:8px 0 0}.footer h2{margin:0 0 12px;color:var(--text);font-size:.82rem}.footer-links{display:grid;gap:6px}.footer-bottom{padding:20px 0;border-top:1px solid var(--hero-edge);font-size:.78rem}.reveal{opacity:0;transform:translateY(8px);transition:opacity .28s cubic-bezier(.22,1,.36,1),transform .28s cubic-bezier(.22,1,.36,1)}.reveal.visible{opacity:1;transform:none}.bottom-cta{position:fixed;z-index:60;left:0;right:0;bottom:0;display:none;padding:8px 20px calc(8px + env(safe-area-inset-bottom));background:rgba(255,255,255,.94);border-top:1px solid var(--hero-edge);backdrop-filter:blur(8px);transform:translateY(110%);transition:transform .2s}.bottom-cta.show{transform:none}.bottom-cta .btn{width:100%;min-height:48px}
    @media(max-width:768px){.container{width:min(100% - 40px,1040px)}.site-header{height:60px}.header-nav{display:none}.hero{padding:64px 0}.hero-grid,.steps,.modes,.deck-layout,.account-layout,.footer-main{grid-template-columns:1fr}.hero-grid{gap:48px}.hero-copy h1{font-size:clamp(2.2rem,11vw,3rem)}.h1-br{display:none}.hero-actions{flex-direction:column}.hero-actions .btn{width:100%}.hero-frame{transform:none}.section{padding:64px 0}.steps,.modes{gap:16px}.mode-online{grid-column:auto;display:block}.mode-flow{margin-top:20px}.sp-proof{grid-template-columns:1fr;padding:22px;justify-items:center}.sp-proof .shot-phone{width:208px}.device-cluster{padding:0}.device-cluster .deck-phone{position:static;width:160px;margin:14px auto 0}.deck-layout,.account-layout{gap:32px}.footer-main{gap:28px}.bottom-cta{display:block}.disclaimer-wrap{padding-bottom:80px}}
    @media(max-width:420px){.hero-copy h1{font-size:2.2rem}.hero-visual{padding-bottom:0}.header-cta{padding-inline:12px}.sp-proof{margin-inline:-4px}.section-heading{margin-bottom:32px}}
    @media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.reveal{opacity:1;transform:none;transition:none}.mode-card,.btn,.bottom-cta{transition:none}.hero-copy,.hero-visual{animation:none}.hero-frame{transform:none}}
    /* デバイスモックアップ枠（スクリーンショット用）: PC=ブラウザ枠 / SP=スマホ枠 */
    .shot-browser{position:relative;background:var(--panel);border:1px solid var(--border);border-radius:14px;box-shadow:var(--shadow-3);overflow:hidden}
    .shot-bar{display:flex;align-items:center;gap:7px;height:34px;padding:0 14px;background:linear-gradient(180deg,#f5f8fc,#e9eef5);border-bottom:1px solid var(--border)}
    .shot-bar i{width:10px;height:10px;border-radius:50%;background:#cdd6e2;flex:none}
    .shot-bar .shot-url{margin-left:6px;flex:1;max-width:340px;height:20px;display:flex;align-items:center;padding:0 12px;border-radius:999px;background:#fff;border:1px solid var(--border);color:var(--text-dim);font:600 .66rem/1 var(--font-num);letter-spacing:.05em;overflow:hidden;white-space:nowrap}
    .shot-browser>img{display:block;width:100%;height:auto}
    .hero-frame{transform:rotate(-1.2deg)}
    .shot-phone{position:relative;flex:none;padding:9px;background:#1d2733;border-radius:28px;box-shadow:var(--shadow-3)}
    .shot-phone::before{content:'';position:absolute;top:16px;left:50%;transform:translateX(-50%);width:56px;height:5px;border-radius:3px;background:rgba(255,255,255,.28);z-index:2}
    .shot-phone>img{display:block;width:100%;height:auto;border-radius:20px}
    .pwa-install-banner{display:flex;align-items:center;justify-content:center;gap:16px;padding:12px 20px;background:#fff7ed;border-bottom:1px solid #f0c9a8;color:var(--text);font-size:.9rem}.pwa-install-banner[hidden]{display:none}.pwa-install-banner .btn{min-height:40px;padding:8px 16px;font-size:.88rem;flex:none}
    @media(max-width:768px){.pwa-install-banner{align-items:stretch;flex-direction:column;gap:8px;text-align:center}.pwa-install-banner .btn{width:100%}}