:root{
  --bg:#F5F7FB;
  --bg-soft:#EEF2F9;
  --bg-card:rgba(255,255,255,.72);
  --bg-glass:rgba(255,255,255,.55);
  --text:#1E293B;
  --text-strong:#0B1220;
  --text-sub:#334155;
  --text-mute:#64748B;
  --brand:#FF6B35;
  --brand-deep:#C2410C;
  --brand-soft:#FFF1E8;
  --brand-2:#7C3AED;
  --brand-2-soft:#EDE9FE;
  --link:#B23A0A;
  --line:rgba(226,232,240,.9);
  --nav-bg:rgba(255,255,255,.78);
  --footer-bg:#0B1220;
  --footer-text:#E5E7EB;
  --footer-sub:#CBD5E1;
  --shadow:0 10px 30px rgba(15,23,42,.10);
  --shadow-hover:0 18px 44px rgba(15,23,42,.18);
  --radius:18px;
  --radius-sm:12px;
  --blur:saturate(180%) blur(14px);
  --grad-brand:linear-gradient(135deg,#FF6B35 0%,#FF8A5B 45%,#7C3AED 100%);
  --grad-banner:linear-gradient(135deg,#FFE7D6 0%,#FFF6EF 42%,#EDE9FE 100%);
  --grad-banner-dark:linear-gradient(135deg,#1E293B 0%,#111C33 55%,#2A1E4D 100%);
  --ease:cubic-bezier(.22,.61,.36,1);
}
html[data-theme="dark"]{
  --bg:#0B1220;
  --bg-soft:#0F172A;
  --bg-card:rgba(17,28,51,.72);
  --bg-glass:rgba(17,28,51,.55);
  --text:#E5E7EB;
  --text-strong:#FFFFFF;
  --text-sub:#CBD5E1;
  --text-mute:#94A3B8;
  --brand:#FF8A5B;
  --brand-deep:#FFB08A;
  --brand-soft:rgba(255,138,91,.12);
  --brand-2:#A78BFA;
  --brand-2-soft:rgba(167,139,250,.14);
  --link:#FFB08A;
  --line:rgba(36,52,71,.9);
  --nav-bg:rgba(15,23,42,.78);
  --footer-bg:#060B16;
  --footer-text:#E2E8F0;
  --footer-sub:#94A3B8;
  --shadow:0 10px 30px rgba(0,0,0,.45);
  --shadow-hover:0 18px 44px rgba(0,0,0,.6);
  --grad-banner:linear-gradient(135deg,#1E293B 0%,#111C33 55%,#2A1E4D 100%);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{
  margin:0;
  font-family:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC",system-ui,sans-serif;
  background:var(--bg);
  color:var(--text);
  line-height:1.85;
  font-size:16px;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
  transition:background .35s var(--ease),color .35s var(--ease);
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background:
    radial-gradient(60vw 60vw at 8% -8%,rgba(255,107,53,.14),transparent 60%),
    radial-gradient(55vw 55vw at 100% 0%,rgba(124,58,237,.14),transparent 60%),
    radial-gradient(50vw 50vw at 50% 110%,rgba(255,138,91,.10),transparent 60%);
}
h1,h2,h3,h4{color:var(--text-strong);line-height:1.35;margin:0 0 14px;letter-spacing:.2px}
h1{font-size:2rem}
h2{font-size:1.5rem;margin-top:34px;position:relative;padding-left:16px}
h2::before{
  content:"";position:absolute;left:0;top:.18em;bottom:.18em;width:6px;border-radius:6px;
  background:var(--grad-brand);
}
h3{font-size:1.2rem;margin-top:24px}
h4{font-size:1.05rem;margin-top:18px;color:var(--text-sub)}
p{margin:0 0 14px;color:var(--text)}
a{color:var(--link);text-decoration:none;transition:color .25s var(--ease),opacity .25s var(--ease)}
a:hover{text-decoration:underline}
img,svg{max-width:100%;height:auto}
.wrap{max-width:1180px;margin:0 auto;padding:0 18px}
::selection{background:rgba(255,107,53,.28)}

header.nav{
  position:sticky;top:0;z-index:80;
  background:var(--nav-bg);
  -webkit-backdrop-filter:var(--blur);
  backdrop-filter:var(--blur);
  border-bottom:1px solid var(--line);
  transition:background .35s var(--ease),border-color .35s var(--ease),box-shadow .35s var(--ease);
}
header.nav:hover{box-shadow:0 6px 24px rgba(15,23,42,.06)}
.nav-inner{display:flex;align-items:center;gap:18px;height:64px}
.logo{
  display:flex;align-items:center;gap:10px;font-weight:800;font-size:1.25rem;
  color:var(--text-strong);letter-spacing:.5px;
}
.logo svg{
  width:34px;height:34px;flex:none;border-radius:10px;
  box-shadow:0 6px 16px rgba(255,107,53,.35);
  transition:transform .45s var(--ease),box-shadow .45s var(--ease);
}
.logo:hover{text-decoration:none}
.logo:hover svg{transform:rotate(-8deg) scale(1.08);box-shadow:0 10px 24px rgba(255,107,53,.5)}
.nav-links{display:flex;gap:6px;margin-left:auto;flex-wrap:wrap}
.nav-links a{
  position:relative;
  color:var(--text-sub);padding:8px 12px;border-radius:10px;font-size:.95rem;font-weight:600;
  transition:background .3s var(--ease),color .3s var(--ease),transform .3s var(--ease);
}
.nav-links 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 .35s var(--ease);
}
.nav-links a:hover{
  background:var(--brand-soft);color:var(--brand-deep);text-decoration:none;transform:translateY(-2px);
}
.nav-links a:hover::after{transform:scaleX(1)}
.nav-actions{display:flex;gap:8px;align-items:center}
.btn{
  border:1px solid var(--line);background:var(--bg-glass);color:var(--text);
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  padding:8px 14px;border-radius:10px;font-size:.9rem;font-weight:600;cursor:pointer;
  transition:transform .28s var(--ease),border-color .28s var(--ease),color .28s var(--ease),box-shadow .28s var(--ease),background .28s var(--ease);
}
.btn:hover{border-color:var(--brand);color:var(--brand-deep);transform:translateY(-2px);box-shadow:0 8px 20px rgba(255,107,53,.18)}
.btn:active{transform:translateY(0) scale(.98)}
.btn-primary{background:var(--grad-brand);border-color:transparent;color:#FFFFFF;box-shadow:0 8px 22px rgba(255,107,53,.32)}
.btn-primary:hover{color:#FFFFFF;box-shadow:0 14px 32px rgba(255,107,53,.45);filter:brightness(1.05)}
.menu-toggle{display:none}
.search-box{position:relative}
.search-box input{
  border:1px solid var(--line);border-radius:10px;padding:8px 12px;font-size:.9rem;
  background:var(--bg-glass);color:var(--text);width:170px;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  transition:width .35s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.search-box input::placeholder{color:var(--text-mute)}
.search-box input:focus{
  outline:none;width:220px;border-color:var(--brand);
  box-shadow:0 0 0 4px rgba(255,107,53,.16);
}

.banner{
  position:relative;overflow:hidden;
  background:var(--grad-banner);
  color:#1F2937;
  padding:56px 0;
  border-bottom:1px solid var(--line);
  transition:background .4s var(--ease);
}
html[data-theme="dark"] .banner{background:var(--grad-banner-dark);color:#E5E7EB}
.banner::before,.banner::after{
  content:"";position:absolute;border-radius:50%;filter:blur(60px);opacity:.55;pointer-events:none;
}
.banner::before{width:420px;height:420px;left:-120px;top:-160px;background:rgba(255,107,53,.35);animation:floatA 14s ease-in-out infinite}
.banner::after{width:380px;height:380px;right:-100px;bottom:-160px;background:rgba(124,58,237,.30);animation:floatB 17s ease-in-out infinite}
@keyframes floatA{0%,100%{transform:translate3d(0,0,0)}50%{transform:translate3d(30px,26px,0)}}
@keyframes floatB{0%,100%{transform:translate3d(0,0,0)}50%{transform:translate3d(-28px,-22px,0)}}
.banner-grid{position:relative;z-index:2;display:grid;grid-template-columns:1.15fr .85fr;gap:36px;align-items:center}
.banner h1{font-size:2.15rem;color:#0B1220;margin-bottom:16px;text-shadow:0 1px 0 rgba(255,255,255,.4)}
html[data-theme="dark"] .banner h1{color:#FFFFFF;text-shadow:none}
.banner p{color:#334155;font-size:1.05rem}
html[data-theme="dark"] .banner p{color:#CBD5E1}
.banner-keywords{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}
.banner-keywords span{
  background:rgba(255,255,255,.75);border:1px solid #FFD6B8;color:#B23A0A;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  padding:5px 12px;border-radius:999px;font-size:.85rem;font-weight:600;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s var(--ease);
}
.banner-keywords span:hover{transform:translateY(-3px) scale(1.04);box-shadow:0 10px 22px rgba(255,107,53,.24);background:#FFFFFF}
html[data-theme="dark"] .banner-keywords span{background:rgba(30,41,59,.8);border-color:#334155;color:#FFB08A}
html[data-theme="dark"] .banner-keywords span:hover{background:#1E293B}
.banner-cta{display:flex;gap:12px;margin-top:22px;flex-wrap:wrap}
.banner-cta .btn-primary{background:var(--grad-brand);border-color:transparent;color:#FFFFFF}
.banner-cta .btn-primary:hover{filter:brightness(1.06)}
.banner-cta .btn{background:rgba(255,255,255,.85);border-color:#E2E8F0;color:#1F2937}
html[data-theme="dark"] .banner-cta .btn{background:rgba(17,28,51,.8);border-color:#334155;color:#E5E7EB}
.banner svg{border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .6s var(--ease),box-shadow .6s var(--ease)}
.banner svg:hover{transform:translateY(-6px) rotate(-1deg);box-shadow:var(--shadow-hover)}

.stats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px;margin-top:26px;position:relative;z-index:2}
.stat{
  background:var(--bg-glass);border:1px solid rgba(255,224,204,.9);border-radius:var(--radius-sm);padding:14px 16px;
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  text-align:center;
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.stat:hover{transform:translateY(-5px);box-shadow:var(--shadow-hover);border-color:var(--brand)}
html[data-theme="dark"] .stat{background:var(--bg-glass);border-color:#334155}
.stat b{display:block;font-size:1.5rem;color:#C2410C;font-variant-numeric:tabular-nums}
html[data-theme="dark"] .stat b{color:#FFB08A}
.stat span{color:#475569;font-size:.85rem}
html[data-theme="dark"] .stat span{color:#94A3B8}

section{padding:44px 0;border-bottom:1px solid var(--line);transition:background .35s var(--ease),border-color .35s var(--ease)}
section.soft{background:var(--bg-soft)}
.crumb{font-size:.88rem;color:var(--text-mute);padding:14px 0}
.crumb a{color:var(--text-sub)}
.crumb a:hover{color:var(--brand-deep)}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.card{
  position:relative;
  background:var(--bg-card);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:20px;
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  box-shadow:var(--shadow);
  overflow:hidden;
  transition:transform .38s var(--ease),box-shadow .38s var(--ease),border-color .38s var(--ease),background .38s var(--ease);
}
.card::before{
  content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;pointer-events:none;
  background:linear-gradient(135deg,rgba(255,107,53,.55),rgba(124,58,237,.45));
  -webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);
  -webkit-mask-composite:xor;mask-composite:exclude;
  opacity:0;transition:opacity .38s var(--ease);
}
.card::after{
  content:"";position:absolute;left:0;right:0;top:0;height:4px;
  background:var(--grad-brand);transform:scaleX(0);transform-origin:left;
  transition:transform .45s var(--ease);
}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:transparent}
.card:hover::before{opacity:1}
.card:hover::after{transform:scaleX(1)}
.card h3{margin-top:0;color:var(--text-strong)}
.card p{color:var(--text-sub);font-size:.95rem}
.tag{
  display:inline-block;background:var(--brand-soft);color:var(--brand-deep);
  padding:3px 10px;border-radius:999px;font-size:.78rem;font-weight:700;margin-bottom:8px;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease);
}
.card:hover .tag{transform:translateY(-2px);box-shadow:0 6px 14px rgba(255,107,53,.2)}
.article-meta{font-size:.82rem;color:var(--text-mute);margin-bottom:8px}
.article-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.article-item{
  position:relative;
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius);padding:18px;
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  box-shadow:var(--shadow);
  transition:transform .38s var(--ease),box-shadow .38s var(--ease),border-color .38s var(--ease);
}
.article-item::before{
  content:"";position:absolute;left:0;top:18px;bottom:18px;width:4px;border-radius:4px;
  background:var(--grad-brand);opacity:0;transform:scaleY(.4);transform-origin:top;
  transition:opacity .38s var(--ease),transform .38s var(--ease);
}
.article-item:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:rgba(255,107,53,.4)}
.article-item:hover::before{opacity:1;transform:scaleY(1)}
.article-item h3{font-size:1.05rem;margin:0 0 8px;transition:color .3s var(--ease)}
.article-item:hover h3{color:var(--brand-deep)}
.article-item p{font-size:.92rem;color:var(--text-sub);margin-bottom:10px}
.read-more{font-weight:700;color:var(--link);display:inline-block;transition:transform .3s var(--ease),letter-spacing .3s var(--ease)}
.article-item:hover .read-more{transform:translateX(5px);letter-spacing:.4px}

.faq-item{
  background:var(--bg-card);border:1px solid var(--line);border-radius:var(--radius-sm);
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  margin-bottom:12px;overflow:hidden;
  transition:box-shadow .35s var(--ease),border-color .35s var(--ease),transform .35s var(--ease);
}
.faq-item:hover{box-shadow:var(--shadow);border-color:rgba(255,107,53,.4)}
.faq-item.open{box-shadow:var(--shadow-hover);border-color:var(--brand)}
.faq-q{
  width:100%;text-align:left;background:transparent;border:0;cursor:pointer;
  padding:16px 18px;font-size:1rem;font-weight:700;color:var(--text-strong);
  display:flex;justify-content:space-between;gap:12px;align-items:center;
  transition:background .3s var(--ease),color .3s var(--ease);
}
.faq-q span{transition:transform .35s var(--ease),color .35s var(--ease);font-weight:700}
.faq-q:hover{background:var(--brand-soft);color:var(--brand-deep)}
.faq-item.open .faq-q{color:var(--brand-deep)}
.faq-item.open .faq-q span{transform:rotate(180deg)}
.faq-a{padding:0 18px 16px;color:var(--text-sub);display:none;font-size:.95rem;animation:fadeSlide .4s var(--ease)}
.faq-item.open .faq-a{display:block}
@keyframes fadeSlide{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:none}}

.howto-step{
  position:relative;
  background:var(--bg-card);border:1px solid var(--line);border-left:4px solid var(--brand);
  border-radius:var(--radius-sm);padding:16px 18px;margin-bottom:12px;
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease);
}
.howto-step:hover{transform:translateX(6px);box-shadow:var(--shadow);border-left-color:var(--brand-2)}
.howto-step h4{margin:0 0 6px;color:var(--text-strong)}
.howto-step p{color:var(--text-sub);font-size:.94rem;margin:0}

table{width:100%;border-collapse:separate;border-spacing:0;margin:14px 0;font-size:.94rem;border-radius:var(--radius-sm);overflow:hidden;box-shadow:var(--shadow)}
th,td{border-bottom:1px solid var(--line);padding:10px 12px;text-align:left}
th{background:var(--brand-soft);color:var(--brand-deep);font-weight:700}
td{color:var(--text-sub);background:var(--bg-card)}
tbody tr{transition:background .3s var(--ease),transform .3s var(--ease)}
tbody tr:hover td{background:rgba(255,107,53,.06)}
tbody tr:last-child td{border-bottom:0}

.timeline{list-style:none;padding:0;margin:0}
.timeline li{
  padding:12px 0 12px 22px;border-left:2px solid var(--brand);position:relative;
  color:var(--text-sub);
  transition:transform .35s var(--ease),color .35s var(--ease);
}
.timeline li::before{
  content:"";position:absolute;left:-7px;top:18px;width:12px;height:12px;border-radius:50%;
  background:var(--grad-brand);border:2px solid var(--bg);
  box-shadow:0 0 0 3px rgba(255,107,53,.16);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.timeline li:hover{transform:translateX(6px);color:var(--text-strong)}
.timeline li:hover::before{transform:scale(1.25);box-shadow:0 0 0 6px rgba(255,107,53,.22)}
.timeline b{color:var(--text-strong)}

footer{
  background:var(--footer-bg);color:var(--footer-text);padding:44px 0 22px;
  position:relative;overflow:hidden;
}
footer::before{
  content:"";position:absolute;top:-120px;left:-80px;width:360px;height:360px;border-radius:50%;
  background:radial-gradient(circle,rgba(255,107,53,.28),transparent 68%);filter:blur(50px);
}
footer .wrap{position:relative;z-index:2}
footer h4{color:#FFFFFF;margin-bottom:10px;font-size:1rem}
footer a{color:var(--footer-sub);transition:color .3s var(--ease),transform .3s var(--ease);display:inline-block}
footer a:hover{color:#FFFFFF;transform:translateX(4px);text-decoration:none}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:26px}
.footer-grid p{color:var(--footer-sub);font-size:.92rem}
.footer-bottom{
  border-top:1px solid #1F2937;margin-top:26px;padding-top:18px;
  font-size:.85rem;color:var(--footer-sub);display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;
}

.back-top{
  position:fixed;right:20px;bottom:24px;z-index:90;display:none;
  background:var(--grad-brand);color:#FFFFFF;border:0;border-radius:50%;width:46px;height:46px;
  font-size:1.1rem;cursor:pointer;box-shadow:0 10px 26px rgba(255,107,53,.4);
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),filter .3s var(--ease);
}
.back-top:hover{transform:translateY(-4px) scale(1.06);box-shadow:0 16px 34px rgba(255,107,53,.55);filter:brightness(1.06)}
.back-top:active{transform:scale(.96)}
.back-top.show{display:block;animation:popIn .35s var(--ease)}
@keyframes popIn{from{opacity:0;transform:scale(.6)}to{opacity:1;transform:scale(1)}}

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

.author-box{
  background:var(--bg-glass);border:1px solid var(--line);border-radius:var(--radius);
  padding:18px;display:flex;gap:16px;align-items:flex-start;
  -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
  box-shadow:var(--shadow);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.author-box:hover{transform:translateY(-4px);box-shadow:var(--shadow-hover)}
.author-box svg{width:56px;height:56px;flex:none;border-radius:50%;box-shadow:0 8px 20px rgba(255,107,53,.3)}
.author-box p{font-size:.92rem;color:var(--text-sub);margin:0}

.contact-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.contact-grid .card p{margin:4px 0}
.contact-grid .card b{color:var(--text-strong);display:block;margin-bottom:4px}

.notice{
  background:var(--brand-soft);border-left:4px solid var(--brand);padding:14px 16px;border-radius:var(--radius-sm);
  color:var(--text-sub);font-size:.94rem;
  -webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);
  transition:transform .35s var(--ease),box-shadow .35s var(--ease);
}
.notice:hover{transform:translateY(-3px);box-shadow:var(--shadow)}

@media (max-width:900px){
  h1{font-size:1.7rem}
  h2{font-size:1.32rem}
  .banner-grid,.grid-3,.grid-2,.article-list,.contact-grid,.footer-grid{grid-template-columns:1fr}
  .banner{padding:38px 0}
  .banner h1{font-size:1.72rem}
  .stats{grid-template-columns:repeat(2,1fr)}
  .nav-links{
    display:none;position:absolute;top:64px;left:0;right:0;background:var(--nav-bg);
    -webkit-backdrop-filter:var(--blur);backdrop-filter:var(--blur);
    flex-direction:column;padding:12px;border-bottom:1px solid var(--line);gap:4px;
    box-shadow:var(--shadow);
  }
  .nav-links.open{display:flex;animation:fadeSlide .35s var(--ease)}
  .menu-toggle{display:inline-block}
  .search-box input{width:110px}
  .search-box input:focus{width:150px}
  .footer-bottom{flex-direction:column}
  .back-top{right:14px;bottom:18px;width:42px;height:42px}
}
@media (max-width:520px){
  body{font-size:15px;line-height:1.8}
  .wrap{padding:0 14px}
  section{padding:32px 0}
  .stats{grid-template-columns:1fr 1fr;gap:10px}
  .stat b{font-size:1.28rem}
  .card,.article-item,.author-box{padding:16px}
  .search-box input{width:92px}
  .search-box input:focus{width:120px}
  .banner-keywords span{font-size:.78rem;padding:4px 10px}
}
@media (prefers-reduced-motion:reduce){
  *{animation:none!important;transition:none!important;scroll-behavior:auto!important}
  .reveal{opacity:1;transform:none}
}