*,*::before,*::after{margin:0;padding:0;box-sizing:border-box}
:root{
  --white:#fff;--bg:#f8fafc;--text:#0f172a;--muted:#64748b;
  --blue:#2563eb;--blue-l:#dbeafe;--blue-d:#1d4ed8;
  --line:#e2e8f0;--shadow:0 4px 24px rgba(15,23,42,.06);
  --max:1080px;--pad:clamp(16px,4vw,24px);
  --sans:"Noto Sans SC",system-ui,sans-serif
}
html{scroll-behavior:smooth}
body{font-family:var(--sans);background:var(--white);color:var(--text);line-height:1.65}

.topline{background:var(--bg);border-bottom:1px solid var(--line);text-align:center;padding:7px var(--pad);font-size:.72rem;color:var(--muted)}
.topline a{color:var(--blue)}

.site-hd{position:sticky;top:0;z-index:100;background:rgba(255,255,255,.95);backdrop-filter:blur(10px);border-bottom:1px solid var(--line)}
.hd-row{max-width:var(--max);margin:0 auto;padding:0 var(--pad);height:62px;display:flex;align-items:center;justify-content:space-between}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:.98rem;color:var(--text);text-decoration:none}
.logo img{width:34px;height:34px;border-radius:8px}
.nav-center{display:flex;gap:28px}
.nav-center a{font-size:.84rem;color:var(--muted);text-decoration:none;font-weight:500;padding:4px 0;border-bottom:2px solid transparent}
.nav-center a:hover,.nav-center a.on{color:var(--blue);border-bottom-color:var(--blue)}
.hd-dl{padding:8px 18px;background:var(--blue);color:#fff;font-size:.8rem;font-weight:600;border-radius:8px;text-decoration:none}
.hd-dl:hover{background:var(--blue-d);color:#fff}
.ham{display:none;background:none;border:1px solid var(--line);border-radius:8px;padding:8px 10px;cursor:pointer}

.wrap{max-width:var(--max);margin:0 auto;padding:0 var(--pad)}
.crumb{padding:18px 0 0;font-size:.74rem;color:var(--muted);display:flex;gap:6px;flex-wrap:wrap}
.crumb a{color:var(--muted);text-decoration:none}.crumb strong{color:var(--text)}

/* Hero — 居中大字 + 浮动设备 */
.hero-white{padding:clamp(48px,8vw,80px) 0 0;text-align:center;background:var(--white)}
.hero-white h1{font-size:clamp(2rem,5vw,3rem);font-weight:800;letter-spacing:-.02em;line-height:1.15;max-width:640px;margin:0 auto 16px}
.hero-white h1 span{color:var(--blue)}
.hero-white .sub{color:var(--muted);font-size:1rem;max-width:520px;margin:0 auto 28px;line-height:1.7}
.hero-btns{display:flex;justify-content:center;gap:12px;flex-wrap:wrap;margin-bottom:48px}
.btn{padding:12px 24px;font-size:.86rem;font-weight:600;border-radius:10px;text-decoration:none;display:inline-flex;align-items:center;gap:8px;border:none;cursor:pointer}
.btn-blue{background:var(--blue);color:#fff;box-shadow:0 4px 14px rgba(37,99,235,.25)}
.btn-blue:hover{background:var(--blue-d);color:#fff}
.btn-ghost{background:var(--white);color:var(--text);border:1px solid var(--line)}

.float-stage{position:relative;max-width:720px;margin:0 auto;padding-bottom:56px;perspective:1000px}
.float-device{border-radius:16px;overflow:hidden;box-shadow:0 24px 60px rgba(15,23,42,.12);border:1px solid var(--line);animation:floatY 5s ease-in-out infinite;transform-style:preserve-3d}
.float-device img{width:100%;display:block}
.float-badge{position:absolute;background:var(--white);border:1px solid var(--line);border-radius:12px;padding:12px 16px;box-shadow:var(--shadow);font-size:.78rem;font-weight:600;text-align:left;line-height:1.4}
.float-badge b{display:block;font-size:1.1rem;color:var(--blue);font-weight:800}
.float-badge.a{top:12%;left:-4%;animation:floatY 5s ease-in-out infinite .5s}
.float-badge.b{bottom:18%;right:-4%;animation:floatY 5s ease-in-out infinite 1s}
@keyframes floatY{0%,100%{transform:translateY(0) rotateX(2deg)}50%{transform:translateY(-12px) rotateX(-2deg)}}

/* 灰底区块交替 */
.zone{padding:clamp(48px,7vw,72px) 0}
.zone-gray{background:var(--bg);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.zone-hd{text-align:center;margin-bottom:32px}
.zone-hd h2{font-size:clamp(1.3rem,3vw,1.65rem);font-weight:800}
.zone-hd p{color:var(--muted);font-size:.9rem;margin-top:8px;max-width:560px;margin-left:auto;margin-right:auto}

.pills{display:flex;justify-content:center;gap:32px;flex-wrap:wrap}
.pill{text-align:center;padding:20px 28px;background:var(--white);border:1px solid var(--line);border-radius:14px;min-width:140px;box-shadow:var(--shadow)}
.pill b{display:block;font-size:1.5rem;color:var(--blue);font-weight:800}
.pill span{font-size:.72rem;color:var(--muted)}

.row3{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feat{padding:24px 20px;background:var(--white);border:1px solid var(--line);border-radius:14px;text-align:center}
.zone-gray .feat{background:var(--white)}
.feat .i{width:44px;height:44px;margin:0 auto 12px;background:var(--blue-l);border-radius:10px;display:flex;align-items:center;justify-content:center;color:var(--blue)}
.feat h3{font-size:.9rem;margin-bottom:6px}
.feat p{font-size:.8rem;color:var(--muted)}

/* 资讯 — 一大两小 */
.news-masonry{display:grid;grid-template-columns:1.2fr 1fr;grid-template-rows:auto auto;gap:16px}
.news-big{grid-row:span 2;background:var(--white);border:1px solid var(--line);border-radius:14px;overflow:hidden;text-decoration:none;color:inherit;box-shadow:var(--shadow);transition:.2s}
.news-big:hover{box-shadow:0 8px 32px rgba(15,23,42,.1)}
.news-big img{width:100%;height:240px;object-fit:cover}
.news-big .tx{padding:20px 22px 24px}
.news-big time{font-size:.7rem;color:var(--blue);font-weight:600}
.news-big h3{font-size:1.05rem;font-weight:700;margin:8px 0;line-height:1.4}
.news-big p{font-size:.84rem;color:var(--muted)}
.news-sm{background:var(--white);border:1px solid var(--line);border-radius:14px;overflow:hidden;text-decoration:none;color:inherit;display:flex;gap:14px;align-items:center;padding:14px;transition:.2s}
.news-sm:hover{border-color:var(--blue)}
.news-sm img{width:100px;height:72px;object-fit:cover;border-radius:8px;flex-shrink:0}
.news-sm h3{font-size:.84rem;font-weight:600;line-height:1.4}
.news-sm time{font-size:.68rem;color:var(--muted)}

.news-list{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
.news-card{background:var(--white);border:1px solid var(--line);border-radius:14px;overflow:hidden;text-decoration:none;color:inherit}
.news-card:hover{border-color:var(--blue)}
.news-card img{width:100%;aspect-ratio:16/10;object-fit:cover}
.news-card .tx{padding:16px 18px 20px}

/* 下载 — OS 选项卡 */
.os-tabs{display:flex;justify-content:center;gap:8px;margin-bottom:28px;flex-wrap:wrap}
.os-tab{padding:10px 20px;border:1px solid var(--line);border-radius:999px;font-size:.82rem;font-weight:600;background:var(--white);cursor:pointer;color:var(--muted)}
.os-tab.active{background:var(--blue);color:#fff;border-color:var(--blue)}
.os-panel{display:none;max-width:520px;margin:0 auto;text-align:center;padding:36px 28px;background:var(--white);border:1px solid var(--line);border-radius:16px;box-shadow:var(--shadow)}
.os-panel.active{display:block}
.os-panel .icon{width:56px;height:56px;margin:0 auto 16px;color:var(--blue)}
.os-panel h3{font-size:1.1rem;margin-bottom:8px}
.os-panel p{font-size:.84rem;color:var(--muted);margin-bottom:20px;line-height:1.6}

.mobile-2{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:28px}
.mobile-box{background:var(--bg);border:1px solid var(--line);border-radius:12px;padding:20px}
.mobile-box h3{font-size:.9rem;margin-bottom:10px;color:var(--blue)}
.mobile-box ol{padding-left:18px;font-size:.84rem;color:var(--muted)}
.mobile-box li{margin-bottom:6px}

.panel{background:var(--white);border:1px solid var(--line);border-radius:14px;padding:clamp(22px,4vw,32px)}
.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}
.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:14px;overflow:hidden;margin-bottom:24px;border:1px solid var(--line)}
.art-cover img{width:100%;max-height:400px;object-fit:cover}
.art-fig{margin:22px 0;border-radius:12px;overflow:hidden;border:1px solid var(--line);background:var(--bg)}
.art-fig img{width:100%;max-height:320px;object-fit:cover}
.art-fig figcaption{padding:10px 14px;font-size:.74rem;color:var(--muted)}
.author{display:flex;gap:12px;padding:16px;background:var(--blue-l);border-radius:10px;margin:18px 0}
.author .av{width:42px;height:42px;border-radius:50%;background:var(--blue);color:#fff;display:flex;align-items:center;justify-content:center;font-weight:700}

.faq details{border-bottom:1px solid var(--line);padding:14px 0}
.faq details:last-child{border-bottom:none}
.faq-hd{font-size:1rem;font-weight:800;margin-bottom:4px}
.faq summary{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 p{padding-top:8px;font-size:.84rem;color:var(--muted);line-height:1.65}
.faq code{font-size:.85em;background:var(--blue-l);padding:2px 6px;border-radius:4px}

.site-ft{margin-top:56px;border-top:1px solid var(--line);background:var(--bg);padding:40px 0 28px}
.ft-grid{max-width:var(--max);margin:0 auto;padding:0 var(--pad);display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:24px}
.ft-grid a{display:block;font-size:.78rem;color:var(--muted);text-decoration:none;margin-bottom:6px}
.ft-grid a:hover{color:var(--blue)}
.ft-b{max-width:var(--max);margin:20px auto 0;padding:16px var(--pad) 0;border-top:1px solid var(--line);font-size:.72rem;color:var(--muted);text-align:center}

.reveal{opacity:0;transform:translateY(18px);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;text-align:left}
.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(--white);border:1px solid var(--line);border-radius:10px;text-align:center;text-decoration:none;color:inherit;box-shadow:var(--shadow);transition:.2s}
.cat-item:hover{border-color:var(--blue);transform:translateY(-2px)}
.cat-item b{display:block;font-size:.8rem;font-weight:700;margin:6px 0 4px}
.cat-item span{font-size:.7rem;color:var(--muted)}
.tutorial-list{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
.tutorial-item{padding:18px;background:var(--white);border:1px solid var(--line);border-radius:10px;text-decoration:none;color:inherit;box-shadow:var(--shadow)}
.tutorial-item:hover{border-color:var(--blue)}
.tutorial-item h3{font-size:.88rem;font-weight:700;margin-bottom:6px;color:var(--blue-d)}
.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:center;padding:12px 16px;background:var(--white);border:1px solid var(--line);border-radius:10px;text-decoration:none;color:inherit}
.update-row:hover{border-color:var(--blue);box-shadow:var(--shadow)}
.update-row time{font-size:.72rem;color:var(--blue);font-weight:600;min-width:88px}
.update-row span{font-size:.84rem;font-weight:600}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.contact-box{padding:18px;background:var(--bg);border:1px solid var(--line);border-radius:10px}
.contact-box h3{font-size:.86rem;font-weight:700;color:var(--blue);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(--white);border-left:4px solid var(--blue);border-radius:0 10px 10px 0;box-shadow:var(--shadow)}
.brand-box h3{font-size:.95rem;font-weight:800;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;color:var(--muted)}
.brand-meta span{padding:4px 10px;background:var(--blue-l);color:var(--blue-d);border-radius:999px;font-weight:600}

@media(max-width:860px){
  .nav-center{display:none;position:absolute;top:62px;left:0;right:0;background:#fff;flex-direction:column;padding:16px var(--pad);gap:12px;border-bottom:1px solid var(--line);box-shadow:var(--shadow)}
  .nav-center.open{display:flex}.ham{display:block}
  .row3,.news-masonry,.news-list,.mobile-2,.ft-grid{grid-template-columns:1fr}
  .news-big{grid-row:span 1}.news-big img{height:180px}
  .float-badge.a{left:2%}.float-badge.b{right:2%}
  .pills{gap:12px}.pill{min-width:100px;padding:14px}
  .cat-grid,.tutorial-list,.contact-grid{grid-template-columns:1fr}
}

.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}