:root{
--brand:#f2603a;
--brand-dark:#c9411f;
--brand-soft:#fff1ec;
--brand-2:#7b5cff;
--brand-3:#ffb347;
--ink:#20222b;
--ink-soft:#565b6b;
--line:#e8e9ef;
--bg:#ffffff;
--bg-soft:#f7f8fb;
--glass:rgba(255,255,255,.62);
--glass-line:rgba(255,255,255,.55);
--radius:14px;
--radius-lg:22px;
--shadow:0 8px 28px rgba(32,34,43,.08);
--shadow-lg:0 18px 46px rgba(32,34,43,.14);
--grad-hero:linear-gradient(120deg,#ffe9e0 0%,#fff6ec 38%,#eef1ff 72%,#f4ecff 100%);
--grad-brand:linear-gradient(135deg,#f2603a 0%,#ff8a5c 45%,#ffb347 100%);
--grad-btn:linear-gradient(135deg,#f2603a 0%,#ff7a55 60%,#ff9d6e 100%);
--ease:cubic-bezier(.22,.61,.36,1);
}
html[data-theme="dark"]{
--brand:#ff7a55;
--brand-dark:#ff9a7c;
--brand-soft:#2a211d;
--brand-2:#9b8cff;
--brand-3:#ffc46b;
--ink:#eef0f6;
--ink-soft:#a8adbd;
--line:#2c2f3a;
--bg:#14161d;
--bg-soft:#1b1e27;
--glass:rgba(28,31,41,.55);
--glass-line:rgba(255,255,255,.08);
--shadow:0 8px 28px rgba(0,0,0,.45);
--shadow-lg:0 18px 46px rgba(0,0,0,.6);
--grad-hero:linear-gradient(120deg,#241a17 0%,#1c1a22 45%,#1a1c2b 100%);
--grad-brand:linear-gradient(135deg,#ff7a55 0%,#ff9a7c 50%,#ffc46b 100%);
--grad-btn:linear-gradient(135deg,#ff7a55 0%,#ff8f6e 60%,#ffb08a 100%);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
color:var(--ink);background:var(--bg);line-height:1.8;font-size:16px;
-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;
transition:background .35s var(--ease),color .35s var(--ease);
overflow-x:hidden;
}
img,svg{display:block;max-width:100%}
a{color:var(--brand);text-decoration:none;transition:color .25s var(--ease)}
a:hover{color:var(--brand-dark)}
h1,h2,h3,h4{line-height:1.4;color:var(--ink);letter-spacing:.2px}
ul{list-style:none}
::selection{background:var(--brand);color:#fff}
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 20px}
.skip{position:absolute;left:-9999px}
.skip:focus{left:12px;top:12px;z-index:999;background:var(--brand);color:#fff;padding:8px 14px;border-radius:8px}
:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:6px}

/* ============ header ============ */
.site-header{
position:sticky;top:0;z-index:100;
background:var(--glass);
-webkit-backdrop-filter:saturate(180%) blur(16px);
backdrop-filter:saturate(180%) blur(16px);
border-bottom:1px solid var(--line);
transition:box-shadow .35s var(--ease),background .35s var(--ease),border-color .35s var(--ease);
}
.site-header.stuck{box-shadow:var(--shadow);border-bottom-color:transparent}
.header-inner{display:flex;align-items:center;gap:18px;height:68px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:20px;color:var(--ink);letter-spacing:.5px}
.logo .mark{
width:38px;height:38px;border-radius:12px;background:var(--grad-brand);
display:flex;align-items:center;justify-content:center;color:#fff;font-size:18px;
box-shadow:0 6px 16px rgba(242,96,58,.35);
transition:transform .4s var(--ease),box-shadow .4s var(--ease);
}
.logo:hover .mark{transform:rotate(-8deg) scale(1.06);box-shadow:0 10px 22px rgba(242,96,58,.45)}
.main-nav{display:flex;gap:4px;margin-left:10px;flex-wrap:wrap}
.main-nav a{padding:8px 12px;border-radius:9px;color:var(--ink-soft);font-size:15px;position:relative;transition:background .25s var(--ease),color .25s var(--ease)}
.main-nav a::after{
content:"";position:absolute;left:12px;right:12px;bottom:4px;height:2px;border-radius:2px;
background:var(--grad-brand);transform:scaleX(0);transform-origin:left;transition:transform .3s var(--ease);
}
.main-nav a:hover{background:var(--brand-soft);color:var(--brand)}
.main-nav a:hover::after{transform:scaleX(1)}
.header-tools{margin-left:auto;display:flex;align-items:center;gap:10px}
.search-form{
display:flex;align-items:center;border:1px solid var(--line);border-radius:999px;overflow:hidden;
background:var(--bg-soft);transition:border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.search-form:focus-within{border-color:var(--brand);box-shadow:0 0 0 4px rgba(242,96,58,.12)}
.search-form input{border:0;background:transparent;padding:8px 14px;color:var(--ink);outline:none;width:150px;font-size:14px}
.search-form input::placeholder{color:var(--ink-soft);opacity:.75}
.search-form button{border:0;background:var(--grad-btn);color:#fff;padding:8px 16px;cursor:pointer;font-size:14px;font-weight:600;transition:filter .25s var(--ease)}
.search-form button:hover{filter:brightness(1.08)}
.icon-btn{
border:1px solid var(--line);background:var(--bg-soft);color:var(--ink);
width:38px;height:38px;border-radius:11px;cursor:pointer;font-size:16px;
display:flex;align-items:center;justify-content:center;
transition:transform .3s var(--ease),background .3s var(--ease),color .3s var(--ease),border-color .3s var(--ease);
}
.icon-btn:hover{background:var(--brand-soft);color:var(--brand);border-color:var(--brand);transform:translateY(-2px)}
.menu-toggle{display:none}
@media(max-width:960px){
.main-nav{
display:none;position:absolute;top:68px;left:0;right:0;
background:var(--glass);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);
flex-direction:column;padding:12px;border-bottom:1px solid var(--line);box-shadow:var(--shadow);
animation:navDrop .3s var(--ease);
}
.main-nav.open{display:flex}
.menu-toggle{display:flex}
.search-form input{width:100px}
}
@keyframes navDrop{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}
@media(max-width:520px){
.search-form{display:none}
.header-inner{height:62px;gap:10px}
.logo{font-size:18px}
.logo .mark{width:34px;height:34px;border-radius:10px}
.main-nav{top:62px}
}

/* ============ hero / banner ============ */
.hero{
position:relative;background:var(--grad-hero);
border-bottom:1px solid var(--line);overflow:hidden;
transition:background .5s var(--ease);
}
.hero::before,.hero::after{
content:"";position:absolute;border-radius:50%;filter:blur(70px);opacity:.55;pointer-events:none;
animation:floatBlob 14s ease-in-out infinite alternate;
}
.hero::before{width:420px;height:420px;background:rgba(242,96,58,.35);top:-160px;left:-120px}
.hero::after{width:460px;height:460px;background:rgba(123,92,255,.28);bottom:-200px;right:-140px;animation-delay:-6s}
html[data-theme="dark"] .hero::before{background:rgba(255,122,85,.22)}
html[data-theme="dark"] .hero::after{background:rgba(123,92,255,.22)}
@keyframes floatBlob{from{transform:translate3d(0,0,0) scale(1)}to{transform:translate3d(30px,-24px,0) scale(1.12)}}
.slider{position:relative;min-height:420px;z-index:1}
.slide{position:absolute;inset:0;opacity:0;transition:opacity .7s var(--ease);display:flex;align-items:center;pointer-events:none}
.slide.active{opacity:1;pointer-events:auto;position:relative;animation:slideIn .7s var(--ease)}
@keyframes slideIn{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:none}}
.slide-inner{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center;padding:50px 0}
.slide h1,.slide h2{font-size:clamp(26px,3.4vw,40px);margin-bottom:16px;letter-spacing:.3px}
.slide .kicker{
display:inline-block;background:var(--glass);border:1px solid var(--glass-line);
-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
color:var(--brand);padding:5px 14px;border-radius:999px;font-size:13px;font-weight:600;margin-bottom:14px;
box-shadow:0 4px 14px rgba(242,96,58,.12);
}
.slide p{color:var(--ink-soft);margin-bottom:22px;max-width:520px}
.btn{
display:inline-block;padding:11px 22px;border-radius:11px;font-weight:600;
border:1px solid transparent;cursor:pointer;
transition:transform .28s var(--ease),box-shadow .28s var(--ease),background .28s var(--ease),color .28s var(--ease),border-color .28s var(--ease);
}
.btn-primary{background:var(--grad-btn);color:#fff;box-shadow:0 8px 20px rgba(242,96,58,.28)}
.btn-primary:hover{color:#fff;transform:translateY(-3px);box-shadow:0 14px 30px rgba(242,96,58,.4)}
.btn-ghost{
border-color:var(--line);color:var(--ink);background:var(--glass);
-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
}
.btn-ghost:hover{color:var(--brand);border-color:var(--brand);transform:translateY(-3px);box-shadow:var(--shadow)}
.slide-visual{
border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--shadow-lg);
border:1px solid var(--glass-line);
transition:transform .5s var(--ease),box-shadow .5s var(--ease);
}
.slide-visual:hover{transform:translateY(-6px) scale(1.01);box-shadow:0 26px 60px rgba(32,34,43,.22)}
.slider-dots{position:absolute;bottom:18px;left:50%;transform:translateX(-50%);display:flex;gap:8px;z-index:2}
.slider-dots button{
width:10px;height:10px;border-radius:50%;border:0;background:var(--line);cursor:pointer;
transition:width .35s var(--ease),background .35s var(--ease);
}
.slider-dots button:hover{background:var(--brand-dark)}
.slider-dots button.active{background:var(--grad-btn);width:26px;border-radius:999px}
@media(max-width:820px){
.slide-inner{grid-template-columns:1fr;padding:36px 0;gap:24px}
.slide-visual{order:-1}
.slider{min-height:0}
}

/* ============ sections ============ */
section{padding:64px 0;position:relative}
section.alt{background:var(--bg-soft);transition:background .35s var(--ease)}
.sec-head{max-width:760px;margin-bottom:36px}
.sec-head .tag{
color:var(--brand);font-weight:700;font-size:13px;letter-spacing:1.4px;text-transform:uppercase;
display:inline-block;padding:3px 10px;border-radius:999px;background:var(--brand-soft);
}
.sec-head h2{font-size:clamp(22px,2.6vw,30px);margin:12px 0 12px}
.sec-head p{color:var(--ink-soft)}
.grid{display:grid;gap:22px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
@media(max-width:900px){.g3,.g4{grid-template-columns:repeat(2,1fr)}}
@media(max-width:620px){.g2,.g3,.g4{grid-template-columns:1fr}}

/* ============ card ============ */
.card{
position:relative;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);
padding:24px;overflow:hidden;
transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease),background .35s var(--ease);
}
.card::before{
content:"";position:absolute;inset:0;border-radius:inherit;pointer-events:none;
background:linear-gradient(135deg,rgba(242,96,58,.09),rgba(123,92,255,.07));
opacity:0;transition:opacity .4s var(--ease);
}
.card::after{
content:"";position:absolute;left:0;top:0;width:100%;height:3px;
background:var(--grad-brand);transform:scaleX(0);transform-origin:left;
transition:transform .45s var(--ease);
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:transparent}
.card:hover::before{opacity:1}
.card:hover::after{transform:scaleX(1)}
.card h3{font-size:18px;margin-bottom:10px;position:relative;z-index:1}
.card p{color:var(--ink-soft);font-size:15px;position:relative;z-index:1}
.card .num{font-size:32px;font-weight:700;color:var(--brand);line-height:1}

/* ============ reveal ============ */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal:nth-child(2){transition-delay:.06s}
.reveal:nth-child(3){transition-delay:.12s}
.reveal:nth-child(4){transition-delay:.18s}
@media(prefers-reduced-motion:reduce){
*{animation:none!important;transition:none!important}
.reveal{opacity:1;transform:none}
}

/* ============ stats ============ */
.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;text-align:center}
@media(max-width:700px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{
padding:26px 12px;background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);
-webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.stat:hover{transform:translateY(-5px);box-shadow:var(--shadow);border-color:var(--brand)}
.stat b{font-size:34px;background:var(--grad-brand);-webkit-background-clip:text;background-clip:text;color:transparent;display:block;line-height:1.2}
.stat span{color:var(--ink-soft);font-size:14px}

/* ============ articles ============ */
.articles{display:grid;grid-template-columns:repeat(2,1fr);gap:22px}
@media(max-width:760px){.articles{grid-template-columns:1fr}}
.article{
position:relative;background:var(--bg);border:1px solid var(--line);border-radius:var(--radius);
padding:24px;display:flex;flex-direction:column;overflow:hidden;
transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.article::before{
content:"";position:absolute;left:0;top:0;bottom:0;width:4px;
background:var(--grad-brand);transform:scaleY(0);transform-origin:top;
transition:transform .4s var(--ease);
}
.article:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg);border-color:transparent}
.article:hover::before{transform:scaleY(1)}
.article .meta{font-size:13px;color:var(--ink-soft);margin-bottom:8px;display:flex;gap:12px;flex-wrap:wrap}
.article .meta span:first-child::before{content:"🕒 ";opacity:.8}
.article h3{font-size:18px;margin-bottom:10px;transition:color .3s var(--ease)}
.article:hover h3{color:var(--brand)}
.article p{color:var(--ink-soft);font-size:15px;flex:1}
.article .more{margin-top:14px;font-weight:600;font-size:14px;display:inline-flex;align-items:center;gap:4px;transition:gap .3s var(--ease)}
.article:hover .more{gap:10px}

/* ============ faq ============ */
.faq-item{
border:1px solid var(--line);border-radius:12px;margin-bottom:12px;background:var(--bg);
overflow:hidden;transition:box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.faq-item:hover{border-color:var(--brand);box-shadow:var(--shadow)}
.faq-item.open{box-shadow:var(--shadow);border-color:var(--brand)}
.faq-q{
width:100%;text-align:left;background:transparent;border:0;padding:18px 22px;
font-size:16px;font-weight:600;color:var(--ink);cursor:pointer;
display:flex;justify-content:space-between;gap:16px;align-items:center;
transition:color .25s var(--ease);
}
.faq-q:hover{color:var(--brand)}
.faq-q .plus{
color:var(--brand);transition:transform .35s var(--ease);flex-shrink:0;
width:26px;height:26px;display:flex;align-items:center;justify-content:center;
border-radius:50%;background:var(--brand-soft);font-weight:700;line-height:1;
}
.faq-item.open .plus{transform:rotate(45deg)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .4s var(--ease)}
.faq-a p{padding:0 22px 20px;color:var(--ink-soft);font-size:15px}

/* ============ howto steps ============ */
.steps{counter-reset:step;display:grid;gap:16px}
.step{
position:relative;padding:20px 22px 20px 66px;background:var(--bg);
border:1px solid var(--line);border-radius:12px;
transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.step:hover{transform:translateX(6px);box-shadow:var(--shadow);border-color:var(--brand)}
.step::before{
counter-increment:step;content:counter(step);
position:absolute;left:18px;top:20px;width:32px;height:32px;border-radius:50%;
background:var(--grad-brand);color:#fff;display:flex;align-items:center;justify-content:center;
font-weight:700;box-shadow:0 6px 14px rgba(242,96,58,.3);
}
.step h4{margin-bottom:6px}
.step p{color:var(--ink-soft);font-size:15px}

/* ============ contact ============ */
.contact-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:32px}
@media(max-width:820px){.contact-grid{grid-template-columns:1fr}}
.info-list{list-style:none;display:grid;gap:14px}
.info-list li{
display:flex;gap:12px;align-items:flex-start;padding:14px 16px;
background:var(--bg);border:1px solid var(--line);border-radius:12px;
transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
}
.info-list li:hover{transform:translateY(-3px);box-shadow:var(--shadow);border-color:var(--brand)}
.info-list .label{color:var(--ink-soft);min-width:76px;font-size:14px}
.info-list .val{font-weight:600}

/* ============ breadcrumb ============ */
.crumbs{font-size:14px;color:var(--ink-soft);padding:16px 0}
.crumbs a{color:var(--ink-soft)}
.crumbs a:hover{color:var(--brand)}

/* ============ footer ============ */
.site-footer{
background:var(--bg-soft);border-top:1px solid var(--line);padding:50px 0 24px;
transition:background .35s var(--ease),border-color .35s var(--ease);
}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:28px}
@media(max-width:820px){.footer-grid{grid-template-columns:1fr 1fr}}
@media(max-width:520px){.footer-grid{grid-template-columns:1fr}}
.footer-col h4{font-size:15px;margin-bottom:14px}
.footer-col ul{list-style:none;display:grid;gap:8px}
.footer-col a{color:var(--ink-soft);font-size:14px;position:relative;transition:color .25s var(--ease),padding-left .25s var(--ease)}
.footer-col a:hover{color:var(--brand);padding-left:6px}
.footer-desc{color:var(--ink-soft);font-size:14px;margin-top:10px}
.copyright{
margin-top:36px;padding-top:20px;border-top:1px solid var(--line);
color:var(--ink-soft);font-size:13px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;
}

/* ============ back to top ============ */
#toTop{
position:fixed;right:20px;bottom:24px;width:46px;height:46px;border-radius:50%;border:0;
background:var(--grad-btn);color:#fff;font-size:18px;cursor:pointer;
opacity:0;pointer-events:none;transition:opacity .35s var(--ease),transform .35s var(--ease),box-shadow .35s var(--ease);
box-shadow:var(--shadow);z-index:90;
}
#toTop.show{opacity:1;pointer-events:auto}
#toTop:hover{transform:translateY(-4px) scale(1.06);box-shadow:0 14px 30px rgba(242,96,58,.4)}

/* ============ misc polish ============ */
.card ul a,.card ul li a{font-size:15px}
.card ul{margin-top:10px}
.card ul li{transition:transform .25s var(--ease)}
.card ul li:hover{transform:translateX(4px)}
@media(max-width:520px){
section{padding:48px 0}
.card{padding:20px}
.article{padding:20px}
.slide-inner{padding:28px 0}
.btn{padding:10px 18px;font-size:15px}
}