*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --bg:#f8fafc;--surface:#fff;--text:#0f172a;--muted:#64748b;
  --blue:#2563eb;--blue-l:#dbeafe;--blue-d:#1d4ed8;
  --line:#e2e8f0;--max:1160px;--pad:clamp(16px,4vw,28px);
  --sans:"Noto Sans SC",system-ui,sans-serif;--radius:16px;
  --shadow:0 4px 24px rgba(37,99,235,.08)
}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--bg);color:var(--text);line-height:1.7}
a{color:var(--blue-d)}img{display:block;max-width:100%}
code{font-family:Consolas,monospace;font-size:.88em;background:var(--blue-l);padding:2px 6px;border-radius:4px}

#bg-3d{position:fixed;inset:0;z-index:0;pointer-events:none;opacity:.28}
.wrap{position:relative;z-index:1}

.notice{background:var(--blue);color:#fff;text-align:center;padding:8px var(--pad);font-size:.76rem}
.notice a{color:#fff;text-decoration:underline}

.hdr{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.94);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);box-shadow:0 1px 0 rgba(37,99,235,.06)}
.hdr-in{max-width:var(--max);margin:0 auto;padding:0 var(--pad);height:66px;display:flex;align-items:center;justify-content:space-between;gap:12px;position:relative}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;color:var(--blue-d);text-decoration:none;font-size:1rem;flex-shrink:0}
.logo img{width:36px;height:36px;border-radius:10px}
.nav{display:flex;gap:4px;flex-wrap:wrap}
.nav a{padding:7px 14px;font-size:.82rem;font-weight:600;color:var(--muted);text-decoration:none;border-radius:999px;white-space:nowrap}
.nav a:hover,.nav a.on{background:var(--blue-l);color:var(--blue-d)}
.cta{padding:9px 18px;background:var(--blue);color:#fff;font-weight:700;font-size:.82rem;border-radius:10px;text-decoration:none;flex-shrink:0;white-space:nowrap}
.cta:hover{background:var(--blue-d);color:#fff}
.menu{display:none;border:1px solid var(--line);background:#fff;border-radius:8px;padding:8px 12px;cursor:pointer;flex-shrink:0}

.cnt{max-width:var(--max);width:100%;margin:0 auto;padding:0 var(--pad);box-sizing:border-box}
.crumb{padding:16px 0 0;font-size:.76rem;color:var(--muted);display:flex;gap:6px;flex-wrap:wrap}
.crumb a{color:var(--muted);text-decoration:none}.crumb strong{color:var(--text)}

.hero-wrap{padding:clamp(36px,5vw,64px) 0 clamp(28px,4vw,40px)}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:clamp(24px,4vw,48px);align-items:center;width:100%}
.hero-copy{min-width:0}
.hero h1,.hero-wrap h1{font-size:clamp(1.8rem,4.5vw,2.8rem);font-weight:800;line-height:1.15;margin:12px 0 16px}
.hero-lead{color:var(--muted);font-size:.95rem;margin-bottom:24px}
.hero-tag{display:inline-block;background:var(--blue-l);color:var(--blue-d);font-size:.72rem;font-weight:700;padding:5px 12px;border-radius:999px}
.hero-btns{display:flex;gap:10px;flex-wrap:wrap}
.btn{padding:12px 22px;font-weight:700;font-size:.86rem;border-radius:11px;text-decoration:none;border:none;cursor:pointer;display:inline-flex;align-items:center;gap:8px}
.btn-fill{background:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(37,99,235,.22)}
.btn-fill:hover{background:var(--blue-d);color:#fff}
.btn-line{border:2px solid var(--blue);color:var(--blue-d);background:#fff}

.hero-visual{position:relative;min-width:0;width:100%}
.cube-box{position:absolute;top:-12px;right:-8px;width:88px;height:88px;perspective:600px;z-index:2;pointer-events:none}
.cube{width:72px;height:72px;position:relative;transform-style:preserve-3d;animation:spin 16s linear infinite;margin:0 auto}
.cube-face{position:absolute;width:72px;height:72px;border:2px solid var(--blue);background:rgba(37,99,235,.1);display:flex;align-items:center;justify-content:center;border-radius:10px;backdrop-filter:blur(4px)}
.cube-face svg{width:32px;height:32px;color:var(--blue)}
.cube-face:nth-child(1){transform:rotateY(0) translateZ(36px)}
.cube-face:nth-child(2){transform:rotateY(90deg) translateZ(36px)}
.cube-face:nth-child(3){transform:rotateY(180deg) translateZ(36px)}
.cube-face:nth-child(4){transform:rotateY(-90deg) translateZ(36px)}
.cube-face:nth-child(5){transform:rotateX(90deg) translateZ(36px)}
.cube-face:nth-child(6){transform:rotateX(-90deg) translateZ(36px)}
@keyframes spin{to{transform:rotateX(-18deg) rotateY(360deg)}}
.hero-img{border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);box-shadow:var(--shadow);width:100%;display:block}
.hero-img img{width:100%;height:auto;object-fit:cover;display:block}

.hero-wrap .stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin-top:clamp(28px,4vw,40px);width:100%;box-sizing:border-box}
.cnt.stats{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px;margin:32px auto;width:100%;max-width:var(--max);box-sizing:border-box;padding:0 var(--pad)}
.stat{background:var(--surface);border:1px solid var(--line);border-radius:14px;padding:18px;text-align:center;min-width:0}
.stat b{display:block;font-size:1.4rem;color:var(--blue);font-weight:800}
.stat span{font-size:.72rem;color:var(--muted);display:block;line-height:1.35}

.sec{padding:clamp(48px,7vw,72px) 0}
.sec-hd{margin-bottom:28px}
.sec-hd h2{font-size:clamp(1.3rem,3vw,1.75rem);font-weight:800}
.sec-hd p{color:var(--muted);font-size:.9rem;margin-top:6px}
.label{font-size:.7rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase;color:var(--blue);margin-bottom:6px}

.panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(22px,4vw,32px)}
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.card{padding:22px;border:1px solid var(--line);border-radius:14px;background:var(--surface);transition:.25s}
.card:hover{border-color:var(--blue);transform:translateY(-3px);box-shadow:var(--shadow)}
.card .ic{width:40px;height:40px;background:var(--blue-l);border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--blue);margin-bottom:12px}
.card h3{font-size:.92rem;margin-bottom:6px}
.card p{font-size:.82rem;color:var(--muted)}

.news-g{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.news-c{background:var(--surface);border:1px solid var(--line);border-radius:14px;overflow:hidden;text-decoration:none;color:inherit;transition:.2s;display:flex;flex-direction:column}
.news-c:hover{border-color:var(--blue);transform:translateY(-4px);box-shadow:var(--shadow)}
.news-c img{width:100%;aspect-ratio:5/3;object-fit:cover;flex-shrink:0}
.news-c .bd{padding:16px 18px 20px;flex:1;display:flex;flex-direction:column}
.news-c time{font-size:.7rem;color:var(--blue);font-weight:600}
.news-c h3{font-size:.9rem;font-weight:700;margin:6px 0;line-height:1.45;flex:1}
.news-c p{font-size:.8rem;color:var(--muted)}

.dl-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:16px;margin:24px 0}
.dl-card{background:var(--surface);border:2px solid var(--line);border-radius:16px;padding:26px 20px;text-align:center;transition:.3s}
.dl-card:hover{border-color:var(--blue);box-shadow:0 12px 32px rgba(37,99,235,.1)}
.dl-card .os{width:52px;height:52px;margin:0 auto 14px;color:var(--blue)}
.dl-card h3{font-size:1rem;margin-bottom:6px}
.dl-card .ver{font-size:.78rem;color:var(--muted);margin-bottom:16px;line-height:1.55}
.dl-card .btn{width:100%;justify-content:center}

.mobile-g{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:20px}
.mobile-c{padding:20px;border:1px solid var(--line);border-radius:14px;background:var(--bg)}
.mobile-c h3{font-size:.92rem;margin-bottom:10px;display:flex;align-items:center;gap:8px}
.mobile-c ol{padding-left:18px;font-size:.84rem;color:var(--muted)}
.mobile-c li{margin-bottom:6px}

.prose{font-size:.9rem;color:var(--muted);line-height:1.75}
.prose h2,.prose h3{color:var(--text);font-weight:700;margin:20px 0 10px}
.prose p{margin-bottom:12px}
.prose ul,.prose ol{padding-left:20px;margin-bottom:12px}
.legal-prose .note{padding:12px 16px;background:var(--blue-l);border-left:3px solid var(--blue);border-radius:0 8px 8px 0;margin-bottom:14px;font-size:.86rem}

.art-cover{border-radius:var(--radius);overflow:hidden;margin-bottom:24px;border:1px solid var(--line);max-height:440px}
.art-cover img{width:100%;max-height:440px;object-fit:cover}
.art-fig{margin:24px 0;border-radius:12px;overflow:hidden;border:1px solid var(--line)}
.art-fig img{width:100%;max-height:360px;object-fit:cover}
.art-fig figcaption{padding:10px 14px;font-size:.76rem;color:var(--muted);background:var(--bg)}
.art-meta{display:flex;gap:12px;flex-wrap:wrap;font-size:.76rem;color:var(--muted);margin-bottom:10px}
.author{display:flex;gap:14px;padding:16px;background:var(--blue-l);border-radius:12px;margin:20px 0}
.author .av{width:48px;height:48px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;flex-shrink:0}

.faq details{border:1px solid var(--line);border-radius:10px;margin-bottom:8px;background:#fff}
.faq summary{padding:14px 16px;font-weight:600;font-size:.86rem;cursor:pointer;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:12px}
.faq summary::-webkit-details-marker{display:none}
.faq summary::after{content:"+";font-size:1.1rem;color:var(--blue);font-weight:400;flex-shrink:0}
.faq details[open] summary::after{content:"−"}
.faq details p{padding:0 16px 14px;font-size:.84rem;color:var(--muted);line-height:1.65}
.faq-hd{font-size:1rem;font-weight:800;margin-bottom:14px}

.ftr{margin-top:48px;background:#fff;border-top:1px solid var(--line);padding:40px 0 28px}
.ftr-g{max-width:var(--max);width:100%;margin:0 auto;padding:0 var(--pad);display:grid;grid-template-columns:1.4fr repeat(3,1fr);gap:clamp(16px,3vw,28px);box-sizing:border-box}
.ftr-g h4{font-size:.82rem;margin-bottom:10px;color:var(--text)}
.ftr-g a{display:block;font-size:.78rem;color:var(--muted);text-decoration:none;margin-bottom:6px;line-height:1.5}
.ftr-g a:hover{color:var(--blue)}
.ftr-b{max-width:var(--max);width:100%;margin:24px auto 0;padding:16px var(--pad) 0;border-top:1px solid var(--line);font-size:.74rem;color:var(--muted);box-sizing:border-box}

.reveal{opacity:0;transform:translateY(20px);transition:.5s}.reveal.show{opacity:1;transform:none}

.home-sec{padding:clamp(40px,6vw,56px) 0}
.home-sec+.home-sec{border-top:1px solid var(--line)}
.home-sec-hd{margin-bottom:20px}
.home-sec-hd .tag{font-size:.68rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--blue);margin-bottom:6px;display:block}
.home-sec-hd h2{font-size:clamp(1.15rem,2.5vw,1.4rem);font-weight:800}
.home-sec-hd p{font-size:.86rem;color:var(--muted);margin-top:6px}
.cat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}
.cat-item{display:block;padding:14px 10px;background:var(--surface);border:1px solid var(--line);border-radius:12px;text-align:center;text-decoration:none;color:inherit;transition:.2s;min-width:0}
.cat-item:hover{border-color:var(--blue);box-shadow:var(--shadow)}
.cat-item b{display:block;font-size:.8rem;font-weight:700;margin:6px 0 4px}
.cat-item span{font-size:.7rem;color:var(--muted);line-height:1.35;display:block}
.tutorial-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.tutorial-item{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:12px;text-decoration:none;color:inherit;height:100%}
.tutorial-item:hover{border-color:var(--blue)}
.tutorial-item h3{font-size:.88rem;font-weight:700;margin-bottom:6px;color:var(--text)}
.tutorial-item p{font-size:.8rem;color:var(--muted);line-height:1.55}
.update-list{display:flex;flex-direction:column;gap:10px}
.update-row{display:flex;gap:14px;align-items:flex-start;padding:12px 16px;background:var(--surface);border:1px solid var(--line);border-radius:10px;text-decoration:none;color:inherit}
.update-row:hover{border-color:var(--blue)}
.update-row time{font-size:.72rem;color:var(--blue);font-weight:600;min-width:88px;flex-shrink:0;padding-top:2px}
.update-row span{font-size:.84rem;font-weight:600;line-height:1.45;min-width:0}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.contact-box{padding:18px;background:var(--blue-l);border-radius:12px;border:1px solid #bfdbfe}
.contact-box h3{font-size:.86rem;font-weight:700;color:var(--blue-d);margin-bottom:8px}
.contact-box p,.contact-box li{font-size:.82rem;color:var(--muted);line-height:1.65}
.contact-box ul{padding-left:18px;margin-top:6px}
.brand-box{padding:22px;background:var(--surface);border:2px solid var(--blue);border-radius:14px}
.brand-box h3{font-size:.95rem;font-weight:800;color:var(--blue-d);margin-bottom:8px}
.brand-box p{font-size:.84rem;color:var(--muted);line-height:1.65;margin-bottom:6px}
.brand-meta{display:flex;flex-wrap:wrap;gap:10px;margin-top:12px;font-size:.72rem}
.brand-meta span{padding:4px 10px;background:var(--blue-l);color:var(--blue-d);border-radius:999px;font-weight:600}

@media(max-width:1024px){
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .ftr-g{grid-template-columns:1fr 1fr}
}

@media(max-width:900px){
  .hero-grid,.hero{grid-template-columns:1fr}
  .hero-visual{max-width:520px;margin:0 auto}
  .cube-box{top:8px;right:8px}
  .cards,.news-g,.dl-cards,.mobile-g{grid-template-columns:1fr}
  .hero-wrap .stats,.cnt.stats{grid-template-columns:repeat(2,minmax(0,1fr))}
  .tutorial-list{grid-template-columns:1fr}
  .nav{display:none;position:absolute;top:100%;left:0;right:0;background:#fff;flex-direction:column;padding:12px var(--pad);border-bottom:1px solid var(--line);box-shadow:0 8px 24px rgba(15,23,42,.08);z-index:50}
  .nav.open{display:flex}
  .menu{display:block}
  .contact-grid{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .ftr-g{grid-template-columns:1fr}
}

@media(max-width:480px){
  .hero-wrap .stats,.cnt.stats{grid-template-columns:1fr}
  .cat-grid{grid-template-columns:1fr}
  .hero-btns .btn{width:100%;justify-content:center}
}

.friend-links-bar{padding:12px var(--pad,16px);text-align:center;font-size:.74rem;color:var(--muted,#64748b);border-top:1px solid var(--line,#e2e8f0);background:rgba(255,255,255,.6)}
.friend-links-bar .friend-links-label{margin-right:8px;font-weight:600}
.friend-links-bar a{margin:0 10px;color:var(--blue,var(--em,#2563eb));text-decoration:none}
.friend-links-bar a:hover{text-decoration:underline}