:root{
--brand:#E8562A;
--brand-dark:#C2411B;
--brand-light:#FFE9E1;
--brand-glow:rgba(232,86,42,.35);
--accent:#8E5BD9;
--accent-light:#F3EEFB;
--ink:#1F2328;
--ink-soft:#4A5158;
--ink-mute:#8A9098;
--line:#E6E8EB;
--line-soft:#F0F1F3;
--bg:#FFFFFF;
--bg-soft:#FAF7F4;
--bg-glass:rgba(255,255,255,.72);
--bg-glass-strong:rgba(255,255,255,.88);
--radius:14px;
--radius-lg:20px;
--radius-sm:10px;
--shadow:0 6px 24px rgba(31,35,40,.08);
--shadow-hover:0 16px 40px rgba(31,35,40,.14);
--shadow-brand:0 8px 28px rgba(232,86,42,.22);
--ease:cubic-bezier(.22,.61,.36,1);
--grad-brand:linear-gradient(135deg,#E8562A 0%,#F2793F 45%,#8E5BD9 100%);
--grad-soft:linear-gradient(160deg,#FFF6F1 0%,#FFFFFF 55%,#F7F1FF 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","Segoe UI",Roboto,sans-serif;
color:var(--ink);
background:var(--bg);
line-height:1.75;
font-size:16px;
-webkit-font-smoothing:antialiased;
-moz-osx-font-smoothing:grayscale;
overflow-x:hidden;
transition:background .35s var(--ease),color .35s var(--ease);
}

img,svg{max-width:100%;display:block}

a{color:var(--brand-dark);text-decoration:none;transition:color .2s var(--ease)}
a:hover{text-decoration:underline}

ul,ol{padding-left:1.4em}

::selection{background:var(--brand);color:#fff}

:focus-visible{outline:2px solid var(--brand);outline-offset:3px;border-radius:4px}

.container{max-width:1180px;margin:0 auto;padding:0 20px}

.section{padding:64px 0;border-bottom:1px solid var(--line);position:relative}
.section:last-of-type{border-bottom:none}
.section-soft{background:var(--bg-soft)}
.section-soft::before{
content:"";
position:absolute;inset:0;
background:radial-gradient(600px 300px at 85% 0%,rgba(142,91,217,.06),transparent 70%);
pointer-events:none;
}

h1,h2,h3,h4{line-height:1.35;color:var(--ink);font-weight:700;letter-spacing:-.01em}
h1{font-size:clamp(1.6rem,3.4vw,2.4rem)}
h2{font-size:clamp(1.35rem,2.6vw,1.85rem);margin-bottom:14px}
h3{font-size:1.15rem;margin:22px 0 10px}
h4{font-size:1rem;margin:16px 0 8px;color:var(--ink-soft)}
p{margin-bottom:14px;color:var(--ink-soft)}
.lead{font-size:1.05rem;color:var(--ink)}

.eyebrow{
display:inline-block;
font-size:.78rem;
letter-spacing:.14em;
color:var(--brand-dark);
background:var(--brand-light);
padding:5px 14px;
border-radius:999px;
font-weight:600;
margin-bottom:14px;
border:1px solid rgba(232,86,42,.14);
}

.grid{display:grid;gap:20px}
.grid-2{grid-template-columns:repeat(2,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}

.card{
background:var(--bg);
border:1px solid var(--line);
border-radius:var(--radius);
padding:22px;
box-shadow:var(--shadow);
transition:transform .3s var(--ease),box-shadow .3s var(--ease),border-color .3s var(--ease);
position:relative;
overflow:hidden;
}
.card::after{
content:"";
position:absolute;top:0;left:0;right:0;height:3px;
background:var(--grad-brand);
opacity:0;
transition:opacity .3s var(--ease);
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover);border-color:rgba(232,86,42,.28)}
.card:hover::after{opacity:1}
.card h3{margin-top:0}

.tag{
display:inline-block;
font-size:.74rem;
background:var(--brand-light);
color:var(--brand-dark);
padding:3px 11px;
border-radius:999px;
margin-right:6px;
margin-bottom:6px;
font-weight:600;
border:1px solid rgba(232,86,42,.12);
}

.meta{font-size:.8rem;color:var(--ink-mute);margin-bottom:8px;letter-spacing:.01em}

.btn{
display:inline-block;
background:var(--grad-brand);
background-size:160% 160%;
color:#fff;
padding:12px 26px;
border-radius:999px;
font-weight:600;
border:none;
cursor:pointer;
font-size:.95rem;
box-shadow:var(--shadow-brand);
transition:transform .25s var(--ease),box-shadow .25s var(--ease),background-position .4s var(--ease);
}
.btn:hover{
background-position:100% 50%;
text-decoration:none;
color:#fff;
transform:translateY(-2px);
box-shadow:0 12px 32px rgba(232,86,42,.32);
}
.btn:active{transform:translateY(0)}

.btn-ghost{
background:transparent;
color:var(--brand-dark);
border:1.5px solid var(--brand);
box-shadow:none;
}
.btn-ghost:hover{
background:var(--brand-light);
color:var(--brand-dark);
transform:translateY(-2px);
box-shadow:0 8px 22px rgba(232,86,42,.16);
}

.skip{position:absolute;left:-9999px}
.skip:focus{left:10px;top:10px;background:#fff;padding:8px 14px;z-index:999;border-radius:8px;border:1px solid var(--brand)}

.header{
position:sticky;top:0;z-index:100;
background:var(--bg-glass);
backdrop-filter:saturate(180%) blur(14px);
-webkit-backdrop-filter:saturate(180%) blur(14px);
border-bottom:1px solid var(--line);
transition:background .35s var(--ease),border-color .35s var(--ease),box-shadow .3s var(--ease);
}
.header.scrolled{box-shadow:0 4px 20px rgba(31,35,40,.06)}

.nav{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}

.brand{
display:flex;align-items:center;gap:10px;
font-weight:800;font-size:1.1rem;color:var(--ink);
transition:transform .25s var(--ease);
}
.brand:hover{text-decoration:none;transform:translateY(-1px)}
.brand-mark{
width:34px;height:34px;border-radius:11px;
background:var(--grad-brand);
display:grid;place-items:center;
color:#fff;font-weight:800;font-size:.95rem;
box-shadow:0 4px 14px var(--brand-glow);
transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.brand:hover .brand-mark{transform:rotate(-8deg) scale(1.06);box-shadow:0 6px 20px var(--brand-glow)}

.nav-links{display:flex;gap:22px;list-style:none;padding:0;margin:0;font-size:.92rem}
.nav-links a{color:var(--ink-soft);font-weight:500;position:relative;padding:4px 0}
.nav-links a::after{
content:"";
position:absolute;left:0;bottom:-2px;
width:0;height:2px;
background:var(--grad-brand);
border-radius:2px;
transition:width .28s var(--ease);
}
.nav-links a:hover{color:var(--brand-dark);text-decoration:none}
.nav-links a:hover::after{width:100%}

.nav-actions{display:flex;align-items:center;gap:10px}

.icon-btn{
width:38px;height:38px;border-radius:11px;
border:1px solid var(--line);
background:var(--bg);
display:grid;place-items:center;
cursor:pointer;color:var(--ink-soft);
transition:all .25s var(--ease);
}
.icon-btn:hover{border-color:var(--brand);color:var(--brand-dark);background:var(--brand-light);transform:translateY(-1px)}
.icon-btn:active{transform:translateY(0)}

.menu-toggle{display:none}

.search-box{
display:flex;align-items:center;
border:1px solid var(--line);
border-radius:999px;
padding:4px 5px 4px 15px;
background:var(--bg);
transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.search-box:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px rgba(232,86,42,.1)}
.search-box input{
border:none;outline:none;font-size:.88rem;
width:150px;background:transparent;color:var(--ink);
font-family:inherit;
}
.search-box input::placeholder{color:var(--ink-mute)}
.search-box button{
border:none;background:var(--grad-brand);
color:#fff;border-radius:999px;
padding:7px 14px;font-size:.82rem;cursor:pointer;
font-family:inherit;font-weight:600;
transition:opacity .2s var(--ease),transform .2s var(--ease);
}
.search-box button:hover{opacity:.9;transform:scale(1.03)}

.hero{
position:relative;
padding:64px 0 56px;
background:var(--grad-soft);
overflow:hidden;
}
.hero::before{
content:"";
position:absolute;
width:520px;height:520px;
top:-220px;right:-140px;
background:radial-gradient(circle,rgba(232,86,42,.16),transparent 68%);
border-radius:50%;
pointer-events:none;
animation:floatGlow 12s ease-in-out infinite;
}
.hero::after{
content:"";
position:absolute;
width:420px;height:420px;
bottom:-200px;left:-120px;
background:radial-gradient(circle,rgba(142,91,217,.14),transparent 68%);
border-radius:50%;
pointer-events:none;
animation:floatGlow 14s ease-in-out infinite reverse;
}
@keyframes floatGlow{
0%,100%{transform:translate(0,0) scale(1)}
50%{transform:translate(-24px,26px) scale(1.08)}
}

.hero-inner{
display:grid;
grid-template-columns:1.15fr .85fr;
gap:40px;
align-items:center;
position:relative;
z-index:1;
}
.hero h1{margin-bottom:16px}
.hero .lead{font-size:1.08rem;margin-bottom:22px}
.hero-cta{display:flex;gap:12px;flex-wrap:wrap;margin-bottom:28px}
.hero-stats{display:flex;gap:28px;flex-wrap:wrap}
.stat-num{
font-size:1.75rem;font-weight:800;
color:var(--brand-dark);
line-height:1.1;
font-variant-numeric:tabular-nums;
background:var(--grad-brand);
-webkit-background-clip:text;
background-clip:text;
-webkit-text-fill-color:transparent;
}
.stat-label{font-size:.8rem;color:var(--ink-mute)}

.hero-visual{
border-radius:var(--radius-lg);
overflow:hidden;
box-shadow:var(--shadow-hover);
background:var(--brand-light);
transition:transform .45s var(--ease),box-shadow .45s var(--ease);
animation:heroFloat 6s ease-in-out infinite;
}
.hero-visual:hover{transform:translateY(-6px) scale(1.01);box-shadow:0 24px 56px rgba(31,35,40,.18)}
@keyframes heroFloat{
0%,100%{transform:translateY(0)}
50%{transform:translateY(-8px)}
}

.carousel{
position:relative;
border-radius:var(--radius);
overflow:hidden;
border:1px solid var(--line);
background:var(--bg-glass-strong);
backdrop-filter:blur(8px);
-webkit-backdrop-filter:blur(8px);
}
.slides{display:flex;transition:transform .55s var(--ease)}
.slide{min-width:100%;padding:26px 24px}
.slide h3{margin-top:0;color:var(--brand-dark)}
.carousel-dots{display:flex;justify-content:center;gap:8px;padding:12px 0}
.dot{
width:9px;height:9px;border-radius:50%;
border:none;background:#D8DCE0;
cursor:pointer;padding:0;
transition:all .3s var(--ease);
}
.dot:hover{background:var(--brand)}
.dot.active{background:var(--brand);width:24px;border-radius:999px}

.toc{
background:var(--bg-glass);
backdrop-filter:blur(12px);
-webkit-backdrop-filter:blur(12px);
border:1px solid var(--line);
border-radius:var(--radius);
padding:22px 26px;
box-shadow:var(--shadow);
}
.toc h2{font-size:1.15rem}
.toc ol{columns:2;column-gap:32px;margin:0;font-size:.92rem}
.toc li{margin-bottom:7px}
.toc a{
color:var(--ink-soft);
position:relative;
transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.toc a:hover{color:var(--brand-dark);text-decoration:none;padding-left:4px}

.breadcrumb{font-size:.85rem;color:var(--ink-mute);padding:16px 0 0}
.breadcrumb ol{list-style:none;padding:0;display:flex;flex-wrap:wrap;gap:6px}
.breadcrumb li::after{content:"›";margin-left:6px;color:#C4C8CC}
.breadcrumb li:last-child::after{content:""}
.breadcrumb a{color:var(--ink-mute)}
.breadcrumb a:hover{color:var(--brand-dark)}

.article-card{display:flex;flex-direction:column;height:100%}
.article-card h3{font-size:1.02rem;margin:6px 0 8px}
.article-card p{font-size:.9rem;flex:1}
.read-more{
font-size:.86rem;font-weight:600;
color:var(--brand-dark);
display:inline-flex;align-items:center;gap:4px;
transition:gap .25s var(--ease),color .2s var(--ease);
}
.read-more:hover{text-decoration:none;gap:8px;color:var(--brand)}
.article-thumb{
border-radius:var(--radius-sm);
overflow:hidden;
margin-bottom:14px;
background:var(--brand-light);
transition:transform .4s var(--ease);
}
.article-card:hover .article-thumb{transform:scale(1.02)}
.article-thumb svg{transition:transform .5s var(--ease)}
.article-card:hover .article-thumb svg{transform:scale(1.05)}

.faq-list{display:flex;flex-direction:column;gap:10px;margin-top:18px}
.faq-item{
border:1px solid var(--line);
border-radius:12px;
background:var(--bg);
overflow:hidden;
transition:border-color .25s var(--ease),box-shadow .25s var(--ease);
}
.faq-item:hover{border-color:rgba(232,86,42,.3)}
.faq-item.open{border-color:rgba(232,86,42,.35);box-shadow:0 6px 20px rgba(232,86,42,.08)}
.faq-q{
width:100%;text-align:left;
background:none;border:none;
padding:16px 18px;
font-size:.98rem;font-weight:600;
color:var(--ink);
display:flex;justify-content:space-between;gap:12px;
cursor:pointer;
font-family:inherit;
transition:color .2s var(--ease),background .2s var(--ease);
}
.faq-q:hover{color:var(--brand-dark);background:var(--brand-light)}
.faq-q .chev{transition:transform .3s var(--ease);color:var(--brand);flex-shrink:0}
.faq-item.open .chev{transform:rotate(180deg)}
.faq-a{
padding:0 18px 16px;
font-size:.92rem;
color:var(--ink-soft);
display:none;
animation:fadeSlide .35s var(--ease);
}
.faq-item.open .faq-a{display:block}
@keyframes fadeSlide{
from{opacity:0;transform:translateY(-6px)}
to{opacity:1;transform:translateY(0)}
}

.steps{counter-reset:step;list-style:none;padding:0;margin-top:18px}
.steps li{
position:relative;
padding:0 0 22px 54px;
border-left:2px solid var(--brand-light);
margin-left:16px;
transition:border-color .3s var(--ease);
}
.steps li:hover{border-left-color:var(--brand)}
.steps li::before{
counter-increment:step;
content:counter(step);
position:absolute;left:-17px;top:0;
width:32px;height:32px;
border-radius:50%;
background:var(--grad-brand);
color:#fff;
display:grid;place-items:center;
font-weight:700;font-size:.9rem;
box-shadow:0 4px 12px var(--brand-glow);
transition:transform .3s var(--ease);
}
.steps li:hover::before{transform:scale(1.1)}
.steps li h4{margin:0 0 6px}
.steps li:last-child{border-left:2px solid transparent}

.reveal{
opacity:0;
transform:translateY(22px);
transition:opacity .7s var(--ease),transform .7s var(--ease);
will-change:opacity,transform;
}
.reveal.visible{opacity:1;transform:none}

table{
width:100%;border-collapse:collapse;
font-size:.9rem;margin:16px 0;
border-radius:var(--radius-sm);
overflow:hidden;
box-shadow:0 2px 10px rgba(31,35,40,.04);
}
th,td{border:1px solid var(--line);padding:11px 14px;text-align:left;transition:background .2s var(--ease)}
th{background:var(--bg-soft);font-weight:600;color:var(--ink)}
tbody tr{transition:background .2s var(--ease)}
tbody tr:hover{background:var(--brand-light)}

blockquote{
border-left:4px solid var(--brand);
padding:14px 20px;
background:var(--bg-glass);
backdrop-filter:blur(8px);
-webkit-backdrop-filter:blur(8px);
border-radius:0 12px 12px 0;
margin:14px 0;
box-shadow:0 2px 12px rgba(31,35,40,.04);
transition:transform .25s var(--ease),box-shadow .25s var(--ease);
}
blockquote:hover{transform:translateX(4px);box-shadow:0 6px 20px rgba(31,35,40,.08)}
blockquote p{margin-bottom:0;font-style:italic}

.footer{
background:#1F2328;
color:#C4C8CC;
padding:52px 0 26px;
font-size:.88rem;
position:relative;
overflow:hidden;
}
.footer::before{
content:"";
position:absolute;
top:0;left:0;right:0;height:3px;
background:var(--grad-brand);
}
.footer h4{color:#fff;font-size:.95rem;margin-bottom:14px}
.footer a{color:#C4C8CC;transition:color .2s var(--ease),padding-left .2s var(--ease)}
.footer a:hover{color:#fff;text-decoration:none;padding-left:3px}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;margin-bottom:32px}
.footer ul{list-style:none;padding:0}
.footer li{margin-bottom:9px}
.footer-bottom{
border-top:1px solid #33383E;
padding-top:22px;
display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;
font-size:.82rem;color:#8A9098;
}

.to-top{
position:fixed;right:22px;bottom:22px;
width:46px;height:46px;border-radius:50%;
background:var(--grad-brand);
color:#fff;border:none;cursor:pointer;
display:grid;place-items:center;
box-shadow:var(--shadow-brand);
opacity:0;visibility:hidden;
transform:translateY(12px) scale(.9);
transition:all .35s var(--ease);
z-index:90;
}
.to-top.show{opacity:1;visibility:visible;transform:translateY(0) scale(1)}
.to-top:hover{transform:translateY(-3px) scale(1.06);box-shadow:0 12px 30px rgba(232,86,42,.4)}

.dark{
--ink:#E8EAED;
--ink-soft:#B4BAC1;
--ink-mute:#8A9098;
--line:#2E3338;
--line-soft:#262B30;
--bg:#15181B;
--bg-soft:#1B1F23;
--bg-glass:rgba(27,31,35,.72);
--bg-glass-strong:rgba(27,31,35,.9);
--brand-light:#3A2016;
--accent-light:#2A2140;
--shadow:0 6px 24px rgba(0,0,0,.4);
--shadow-hover:0 16px 40px rgba(0,0,0,.55);
--grad-soft:linear-gradient(160deg,#241812 0%,#15181B 55%,#1C1726 100%);
}
.dark body{background:var(--bg)}
.dark .header{background:rgba(21,24,27,.82)}
.dark .card,.dark .faq-item,.dark .search-box,.dark .icon-btn,.dark .carousel,.dark .toc{
background:var(--bg-soft);
}
.dark .card:hover{border-color:rgba(232,86,42,.4)}
.dark .hero{background:var(--grad-soft)}
.dark .footer{background:#0E1013}
.dark .footer::before{opacity:.85}
.dark .stat-num{-webkit-text-fill-color:transparent}
.dark .btn-ghost{color:#FF8A5C;border-color:#FF8A5C}
.dark .btn-ghost:hover{background:rgba(255,138,92,.12);color:#FF8A5C}
.dark .faq-q:hover{background:rgba(232,86,42,.1)}
.dark .faq-item.open{border-color:rgba(232,86,42,.4)}
.dark .dot{background:#3A4046}
.dark .dot.active{background:var(--brand)}
.dark th{background:#1F2429}
.dark tbody tr:hover{background:rgba(232,86,42,.08)}
.dark blockquote{background:rgba(27,31,35,.7)}
.dark .article-thumb{background:#2A2140}
.dark .hero-visual{background:#2A2140}
.dark .breadcrumb li::after{color:#4A5158}
.dark ::selection{background:var(--brand);color:#fff}
.dark .eyebrow{background:rgba(232,86,42,.16);border-color:rgba(232,86,42,.24)}
.dark .tag{background:rgba(232,86,42,.16);border-color:rgba(232,86,42,.2)}

@media(max-width:960px){
.nav-links{
display:none;
position:absolute;
top:64px;left:0;right:0;
background:var(--bg-glass-strong);
backdrop-filter:blur(16px);
-webkit-backdrop-filter:blur(16px);
flex-direction:column;
padding:16px 20px;
border-bottom:1px solid var(--line);
gap:14px;
box-shadow:0 12px 30px rgba(31,35,40,.1);
animation:menuDrop .3s var(--ease);
}
@keyframes menuDrop{
from{opacity:0;transform:translateY(-8px)}
to{opacity:1;transform:translateY(0)}
}
.dark .nav-links{background:rgba(27,31,35,.95)}
.nav-links.open{display:flex}
.menu-toggle{display:grid}
.search-box{display:none}
.hero-inner,.grid-3,.grid-4,.footer-grid{grid-template-columns:1fr 1fr}
.toc ol{columns:1}
.hero{padding:48px 0 40px}
.section{padding:52px 0}
}

@media(max-width:640px){
.grid-2,.grid-3,.grid-4,.hero-inner,.footer-grid{grid-template-columns:1fr}
.hero{padding:36px 0 32px}
.section{padding:40px 0}
.hero-stats{gap:20px}
.hero-cta{flex-direction:column;align-items:stretch}
.hero-cta .btn{text-align:center}
.stat-num{font-size:1.5rem}
.toc{padding:18px 20px}
.footer-grid{gap:26px}
.footer-bottom{flex-direction:column;gap:8px}
.to-top{right:16px;bottom:16px;width:42px;height:42px}
.card{padding:18px}
.steps li{padding-left:48px}
blockquote{padding:12px 16px}
table{font-size:.84rem}
th,td{padding:9px 10px}
}

@media(prefers-reduced-motion:reduce){
*,*::before,*::after{
animation-duration:.01ms !important;
animation-iteration-count:1 !important;
transition-duration:.01ms !important;
scroll-behavior:auto !important;
}
.reveal{opacity:1;transform:none}
}

@media print{
.header,.footer,.to-top,.hero-visual,.hero-cta,.search-box,.icon-btn{display:none !important}
body{background:#fff;color:#000}
.section{padding:20px 0;border:none}
.card{box-shadow:none;border:1px solid #ccc}
a{color:#000;text-decoration:underline}
}