:root{--brand:#ff6b00;--brand-light:#ff9a3c;--brand-soft:#fff4ec;--brand-glow:rgba(255,107,0,.35);--bg:#ffffff;--bg-alt:#fafafa;--surface:#ffffff;--surface-2:#f7f7f9;--text:#222222;--text-soft:#444444;--text-muted:#888888;--border:#eeeeee;--shadow-sm:0 2px 8px rgba(0,0,0,.04);--shadow-md:0 8px 28px rgba(0,0,0,.08);--shadow-lg:0 18px 48px rgba(255,107,0,.18);--glass:rgba(255,255,255,.72);--glass-border:rgba(255,255,255,.55);--radius-sm:8px;--radius:14px;--radius-lg:22px;--ease:cubic-bezier(.22,.61,.36,1);--header-h:68px}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:calc(var(--header-h) + 16px)}
body{font-family:"PingFang SC","Microsoft YaHei","Hiragino Sans GB",Arial,sans-serif;color:var(--text);background:var(--bg);line-height:1.8;font-size:16px;-webkit-font-smoothing:antialiased;text-rendering:optimizeLegibility;transition:background .4s var(--ease),color .4s var(--ease);overflow-x:hidden}
img,svg{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none;transition:color .25s var(--ease),opacity .25s var(--ease)}
a:hover{color:var(--brand-light);text-decoration:none}
ul{list-style:none}
::selection{background:var(--brand);color:#fff}
.container{max-width:1200px;margin:0 auto;padding:0 20px}
header.site-header{position:sticky;top:0;z-index:1000;background:var(--glass);-webkit-backdrop-filter:saturate(180%) blur(18px);backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid var(--glass-border);box-shadow:0 2px 20px rgba(0,0,0,.06);transition:background .4s var(--ease),border-color .4s var(--ease)}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;max-width:1200px;margin:0 auto;flex-wrap:wrap;gap:12px}
.logo{display:flex;align-items:center;gap:10px;font-weight:800;font-size:20px;color:var(--brand);letter-spacing:.5px;transition:transform .3s var(--ease)}
.logo:hover{transform:translateY(-1px)}
.logo svg{width:42px;height:42px;border-radius:12px;box-shadow:0 6px 16px var(--brand-glow);transition:transform .4s var(--ease),box-shadow .4s var(--ease)}
.logo:hover svg{transform:rotate(-6deg) scale(1.05);box-shadow:0 10px 24px var(--brand-glow)}
nav.main-nav ul{display:flex;gap:6px;flex-wrap:wrap;align-items:center}
nav.main-nav a{position:relative;display:inline-block;color:var(--text-soft);font-size:15px;padding:6px 12px;border-radius:999px;transition:color .25s var(--ease),background .25s var(--ease)}
nav.main-nav a::after{content:"";position:absolute;left:50%;bottom:2px;width:0;height:2px;background:linear-gradient(90deg,var(--brand),var(--brand-light));border-radius:2px;transform:translateX(-50%);transition:width .3s var(--ease)}
nav.main-nav a:hover{color:var(--brand);background:var(--brand-soft)}
nav.main-nav a:hover::after{width:60%}
.search-box{display:flex;gap:8px;align-items:center}
.search-box input{padding:8px 14px;border:1px solid var(--border);border-radius:999px;font-size:14px;background:var(--surface);color:var(--text);outline:none;width:150px;transition:width .35s var(--ease),border-color .25s var(--ease),box-shadow .25s var(--ease)}
.search-box input::placeholder{color:var(--text-muted)}
.search-box input:focus{width:200px;border-color:var(--brand);box-shadow:0 0 0 4px rgba(255,107,0,.12)}
.search-box button{padding:8px 18px;background:linear-gradient(135deg,var(--brand-light),var(--brand));color:#fff;border:none;border-radius:999px;cursor:pointer;font-size:14px;font-weight:600;transition:transform .25s var(--ease),box-shadow .25s var(--ease),filter .25s var(--ease)}
.search-box button:hover{transform:translateY(-2px);box-shadow:0 8px 20px var(--brand-glow);filter:brightness(1.05)}
.search-box button:active{transform:translateY(0) scale(.97)}
.theme-toggle{background:var(--surface-2);border:1px solid var(--border);width:40px;height:40px;border-radius:50%;cursor:pointer;font-size:17px;line-height:1;display:inline-flex;align-items:center;justify-content:center;transition:transform .4s var(--ease),background .25s var(--ease),border-color .25s var(--ease)}
.theme-toggle:hover{transform:rotate(20deg) scale(1.08);background:var(--brand-soft);border-color:var(--brand)}
.banner{position:relative;padding:90px 20px 100px;text-align:center;color:#fff;overflow:hidden;background:linear-gradient(135deg,#ff9a3c 0%,#ff6b00 45%,#e85600 100%);isolation:isolate}
.banner::before{content:"";position:absolute;inset:-40%;background:radial-gradient(circle at 20% 20%,rgba(255,255,255,.35),transparent 45%),radial-gradient(circle at 80% 30%,rgba(255,214,0,.35),transparent 45%),radial-gradient(circle at 50% 90%,rgba(255,255,255,.18),transparent 50%);animation:bannerFloat 16s ease-in-out infinite alternate;z-index:-1}
.banner::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:70px;background:linear-gradient(to bottom,transparent,var(--bg));z-index:-1;pointer-events:none}
.banner h1{font-size:clamp(24px,4vw,38px);line-height:1.35;margin-bottom:16px;font-weight:800;letter-spacing:.5px;text-shadow:0 4px 24px rgba(0,0,0,.18);animation:fadeUp .8s var(--ease) both}
.banner p{font-size:clamp(15px,1.6vw,17px);max-width:820px;margin:0 auto 26px;color:rgba(255,255,255,.94);animation:fadeUp .8s .12s var(--ease) both}
.banner .cta{display:inline-block;background:#fff;color:var(--brand);padding:13px 34px;border-radius:999px;font-weight:700;box-shadow:0 12px 30px rgba(0,0,0,.18);transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s var(--ease);animation:fadeUp .8s .24s var(--ease) both}
.banner .cta:hover{transform:translateY(-3px) scale(1.03);box-shadow:0 18px 40px rgba(0,0,0,.26);background:#fff8f2;color:var(--brand)}
.breadcrumb{font-size:13px;color:var(--text-muted);padding:14px 20px;max-width:1200px;margin:0 auto}
.breadcrumb a{color:var(--text-muted)}
.breadcrumb a:hover{color:var(--brand)}
main{max-width:1200px;margin:0 auto;padding:24px 20px 40px}
section{margin-bottom:56px;animation:fadeUp .7s var(--ease) both}
h2{position:relative;font-size:clamp(21px,2.4vw,26px);color:var(--text);padding-left:16px;margin-bottom:22px;line-height:1.4;font-weight:800}
h2::before{content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);width:6px;height:70%;border-radius:6px;background:linear-gradient(180deg,var(--brand-light),var(--brand));box-shadow:0 4px 14px var(--brand-glow)}
h3{font-size:clamp(17px,1.8vw,20px);color:var(--text);margin:22px 0 12px;font-weight:700}
h4{font-size:17px;color:var(--text-soft);margin:14px 0 8px;font-weight:600}
p{margin-bottom:12px;color:var(--text-soft)}
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:22px}
.card{position:relative;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);padding:24px 20px;box-shadow:var(--shadow-sm);overflow:hidden;transition:transform .4s var(--ease),box-shadow .4s var(--ease),border-color .4s var(--ease)}
.card::before{content:"";position:absolute;inset:0;background:linear-gradient(135deg,rgba(255,107,0,.08),transparent 55%);opacity:0;transition:opacity .4s var(--ease);pointer-events:none}
.card:hover{transform:translateY(-8px);box-shadow:var(--shadow-lg);border-color:rgba(255,107,0,.35)}
.card:hover::before{opacity:1}
.card svg{width:56px;height:56px;margin-bottom:14px;transition:transform .45s var(--ease)}
.card:hover svg{transform:translateY(-4px) scale(1.08)}
.card h3{margin-top:0;font-size:18px}
.card p{font-size:14.5px;margin-bottom:0}
.article-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:22px}
.article-item{position:relative;border:1px solid var(--border);border-radius:var(--radius);padding:20px;background:var(--surface-2);overflow:hidden;transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease),background .35s var(--ease)}
.article-item::after{content:"";position:absolute;left:0;top:0;width:4px;height:100%;background:linear-gradient(180deg,var(--brand-light),var(--brand));transform:scaleY(0);transform-origin:top;transition:transform .35s var(--ease)}
.article-item:hover{transform:translateY(-6px);background:var(--surface);box-shadow:var(--shadow-md);border-color:rgba(255,107,0,.3)}
.article-item:hover::after{transform:scaleY(1)}
.article-item h3{font-size:17px;margin:0 0 8px;line-height:1.5;transition:color .25s var(--ease)}
.article-item:hover h3{color:var(--brand)}
.article-meta{font-size:12px;color:var(--text-muted);margin-bottom:8px;letter-spacing:.3px}
.article-item p{font-size:14px;margin-bottom:0}
.faq-item{border-bottom:1px solid var(--border);padding:14px 0;transition:background .3s var(--ease)}
.faq-item summary{position:relative;cursor:pointer;font-weight:600;color:var(--text);font-size:16px;padding-right:28px;list-style:none;transition:color .25s var(--ease)}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";position:absolute;right:4px;top:50%;transform:translateY(-50%);font-size:20px;font-weight:400;color:var(--brand);transition:transform .3s var(--ease)}
.faq-item[open] summary{color:var(--brand)}
.faq-item[open] summary::after{transform:translateY(-50%) rotate(45deg)}
.faq-item summary:hover{color:var(--brand)}
.faq-item p{margin-top:10px;color:var(--text-soft);font-size:15px;animation:fadeUp .35s var(--ease) both}
.howto-step{position:relative;background:var(--brand-soft);border-left:4px solid var(--brand);padding:14px 18px;margin-bottom:14px;border-radius:var(--radius-sm);transition:transform .3s var(--ease),box-shadow .3s var(--ease)}
.howto-step:hover{transform:translateX(6px);box-shadow:var(--shadow-sm)}
.howto-step h4{margin:0 0 6px;color:var(--brand)}
.howto-step p{margin-bottom:0;font-size:14.5px}
table{width:100%;border-collapse:separate;border-spacing:0;margin:16px 0;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;font-size:14px}
th,td{padding:12px 14px;text-align:left;border-bottom:1px solid var(--border)}
th{background:var(--brand-soft);color:var(--brand);font-weight:700}
tr:last-child td{border-bottom:none}
tbody tr,table tr{transition:background .25s var(--ease)}
table tr:hover td{background:var(--surface-2)}
.tag{display:inline-block;background:var(--brand-soft);color:var(--brand);font-size:12px;padding:3px 10px;border-radius:999px;margin-right:6px;transition:transform .25s var(--ease),background .25s var(--ease)}
.tag:hover{transform:translateY(-2px);background:rgba(255,107,0,.16)}
#sitemap ul{display:flex;flex-wrap:wrap;gap:10px}
#sitemap li a{display:inline-block;padding:7px 16px;border-radius:999px;background:var(--surface-2);border:1px solid var(--border);font-size:14px;color:var(--text-soft);transition:all .3s var(--ease)}
#sitemap li a:hover{background:linear-gradient(135deg,var(--brand-light),var(--brand));color:#fff;border-color:transparent;transform:translateY(-3px);box-shadow:0 8px 20px var(--brand-glow)}
footer.site-footer{position:relative;background:#1c1c1f;color:#b9b9c0;padding:48px 20px 28px;margin-top:48px;overflow:hidden}
footer.site-footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--brand-light),var(--brand),#ffd600)}
.footer-inner{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:28px}
footer.site-footer h4{color:#fff;margin-bottom:12px;font-size:16px}
footer.site-footer p{color:#b9b9c0;font-size:14px;margin-bottom:0}
footer.site-footer ul{display:flex;flex-direction:column;gap:8px}
footer.site-footer a{color:#b9b9c0;font-size:14px;transition:color .25s var(--ease),padding-left .25s var(--ease)}
footer.site-footer a:hover{color:var(--brand-light);padding-left:5px}
.copyright{text-align:center;font-size:13px;color:#888;margin-top:32px;border-top:1px solid #333;padding-top:18px;max-width:1200px;margin-left:auto;margin-right:auto}
.copyright p{margin-bottom:0;color:#888}
.back-to-top{position:fixed;right:22px;bottom:22px;z-index:999;background:linear-gradient(135deg,var(--brand-light),var(--brand));color:#fff;border:none;border-radius:50%;width:48px;height:48px;font-size:20px;cursor:pointer;box-shadow:0 8px 24px var(--brand-glow);transition:transform .3s var(--ease),box-shadow .3s var(--ease);animation:fadeUp .4s var(--ease) both}
.back-to-top:hover{transform:translateY(-4px) scale(1.06);box-shadow:0 14px 34px var(--brand-glow)}
.back-to-top:active{transform:scale(.94)}
body.dark-mode{--bg:#101014;--bg-alt:#16161b;--surface:#1a1a20;--surface-2:#202028;--text:#ececf1;--text-soft:#c3c3cc;--text-muted:#8a8a96;--border:#2a2a33;--glass:rgba(22,22,27,.72);--glass-border:rgba(255,255,255,.08);--shadow-sm:0 2px 8px rgba(0,0,0,.4);--shadow-md:0 8px 28px rgba(0,0,0,.5);--shadow-lg:0 18px 48px rgba(255,107,0,.25);--brand-soft:rgba(255,107,0,.14)}
body.dark-mode .banner::after{background:linear-gradient(to bottom,transparent,var(--bg))}
body.dark-mode .card::before{background:linear-gradient(135deg,rgba(255,107,0,.14),transparent 55%)}
body.dark-mode footer.site-footer{background:#0b0b0e}
body.dark-mode table tr:hover td{background:#24242c}
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
@keyframes bannerFloat{0%{transform:translate3d(0,0,0) scale(1)}100%{transform:translate3d(-3%,-2%,0) scale(1.08)}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.001ms !important;animation-iteration-count:1 !important;transition-duration:.001ms !important;scroll-behavior:auto !important}}
@media(max-width:992px){.header-inner{justify-content:center}.logo{order:1}.theme-toggle{order:2}.main-nav{order:3;width:100%}.main-nav ul{justify-content:center}.search-box{order:4;width:100%;justify-content:center}.search-box input{flex:1;max-width:320px;width:auto}.search-box input:focus{width:auto}}
@media(max-width:768px){:root{--header-h:120px}.banner{padding:64px 18px 78px}.banner h1{font-size:24px}.banner p{font-size:15px}.banner .cta{padding:11px 26px;font-size:15px}main{padding:16px 16px 32px}section{margin-bottom:42px}.grid{grid-template-columns:1fr;gap:16px}.article-list{grid-template-columns:1fr;gap:16px}h2{margin-bottom:16px}.card{padding:20px 18px}.search-box input{max-width:100%}.faq-item summary{font-size:15px}table{font-size:13px}th,td{padding:9px 10px}.back-to-top{right:14px;bottom:14px;width:42px;height:42px}}
@media(max-width:480px){.logo{font-size:17px}.logo svg{width:36px;height:36px}nav.main-nav a{font-size:14px;padding:5px 9px}.banner{padding:52px 16px 66px}.banner h1{font-size:21px}.banner .cta{width:100%;max-width:280px;text-align:center}}
@media(hover:none){.card:hover,.article-item:hover,.howto-step:hover{transform:none}}