:root{--orange:#ff6b35;--orange-light:#ff9f1c;--orange-soft:#fff3ec;--bg:#f5f7fa;--bg-alt:#eef2f7;--card:#ffffff;--text:#333333;--text-strong:#222222;--text-soft:#555555;--text-muted:#999999;--border:#e8ecf1;--shadow:0 2px 12px rgba(0,0,0,.06);--shadow-hover:0 12px 32px rgba(255,107,53,.18);--glass:rgba(255,255,255,.72);--glass-border:rgba(255,255,255,.5);--footer-bg:#1c1f26;--footer-text:#a8b0bd;--radius:14px;--radius-sm:10px;--ease:cubic-bezier(.22,.61,.36,1)}
@media(prefers-color-scheme:dark){:root{--bg:#12151c;--bg-alt:#171b24;--card:#1c212c;--text:#d6dbe4;--text-strong:#f1f4f9;--text-soft:#b3bbc9;--text-muted:#7d8697;--border:#2a3140;--shadow:0 2px 12px rgba(0,0,0,.4);--shadow-hover:0 12px 32px rgba(255,107,53,.28);--glass:rgba(28,33,44,.72);--glass-border:rgba(255,255,255,.08);--footer-bg:#0d1016;--footer-text:#8b94a3;--orange-soft:rgba(255,107,53,.14)}}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;line-height:1.8;color:var(--text);background:var(--bg);transition:background .4s var(--ease),color .4s var(--ease);overflow-x:hidden}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background:radial-gradient(circle at 12% 8%,rgba(255,107,53,.10),transparent 42%),radial-gradient(circle at 88% 4%,rgba(255,159,28,.10),transparent 40%),radial-gradient(circle at 50% 100%,rgba(255,107,53,.06),transparent 55%)}
a{color:var(--orange);text-decoration:none;transition:color .25s var(--ease),opacity .25s var(--ease)}
a:hover{text-decoration:underline;color:var(--orange-light)}
img{max-width:100%;height:auto;display:block}
ul{list-style:none}
.container{max-width:1200px;margin:0 auto;padding:0 20px;width:100%}
::selection{background:var(--orange);color:#fff}
::-webkit-scrollbar{width:10px;height:10px}
::-webkit-scrollbar-track{background:var(--bg-alt)}
::-webkit-scrollbar-thumb{background:linear-gradient(180deg,var(--orange),var(--orange-light));border-radius:6px;border:2px solid var(--bg-alt)}
::-webkit-scrollbar-thumb:hover{background:var(--orange)}
header{background:var(--glass);backdrop-filter:blur(18px) saturate(180%);-webkit-backdrop-filter:blur(18px) saturate(180%);box-shadow:0 2px 18px rgba(0,0,0,.06);position:sticky;top:0;z-index:100;border-bottom:1px solid var(--glass-border);transition:background .4s var(--ease),box-shadow .3s var(--ease)}
@supports not ((backdrop-filter:blur(1px)) or (-webkit-backdrop-filter:blur(1px))){header{background:var(--card)}}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 0;flex-wrap:wrap;gap:10px}
.logo{font-size:24px;font-weight:800;letter-spacing:.5px;background:linear-gradient(120deg,var(--orange),var(--orange-light));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;color:var(--orange);position:relative;transition:transform .3s var(--ease)}
.logo::after{content:"";position:absolute;left:0;bottom:2px;width:0;height:3px;border-radius:3px;background:linear-gradient(90deg,var(--orange),var(--orange-light));transition:width .35s var(--ease)}
.logo:hover{text-decoration:none;transform:translateY(-1px)}
.logo:hover::after{width:100%}
.nav-links{display:flex;gap:24px;flex-wrap:wrap}
.nav-links a{color:var(--text);font-size:15px;position:relative;padding:4px 0;transition:color .25s var(--ease)}
.nav-links a::after{content:"";position:absolute;left:0;bottom:0;width:0;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--orange),var(--orange-light));transition:width .3s var(--ease)}
.nav-links a:hover{color:var(--orange);text-decoration:none}
.nav-links a:hover::after{width:100%}
.hero{position:relative;background:linear-gradient(135deg,#ff6b35 0%,#ff9f1c 55%,#ffb703 100%);color:#fff;padding:80px 0;text-align:center;overflow:hidden;isolation:isolate}
.hero::before{content:"";position:absolute;inset:0;background:radial-gradient(circle at 20% 20%,rgba(255,255,255,.28),transparent 45%),radial-gradient(circle at 80% 80%,rgba(255,255,255,.18),transparent 45%);pointer-events:none;z-index:-1}
.hero::after{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.22) 1.5px,transparent 1.5px);background-size:26px 26px;opacity:.5;pointer-events:none;z-index:-1;animation:heroDrift 26s linear infinite}
@keyframes heroDrift{0%{background-position:0 0}100%{background-position:260px 260px}}
.hero h1{font-size:34px;line-height:1.4;margin-bottom:18px;font-weight:800;text-shadow:0 3px 16px rgba(0,0,0,.16);animation:fadeUp .8s var(--ease) both}
.hero p{font-size:16px;max-width:820px;margin:0 auto;opacity:.96;text-shadow:0 2px 10px rgba(0,0,0,.12);animation:fadeUp .8s .12s var(--ease) both}
@keyframes fadeUp{from{opacity:0;transform:translateY(26px)}to{opacity:1;transform:translateY(0)}}
section{padding:56px 0;position:relative}
section h2{font-size:27px;color:var(--text-strong);margin-bottom:26px;border-left:4px solid var(--orange);padding-left:14px;line-height:1.4;position:relative;letter-spacing:.3px}
section h2::after{content:"";position:absolute;left:14px;bottom:-6px;width:44px;height:3px;border-radius:3px;background:linear-gradient(90deg,var(--orange),var(--orange-light));opacity:.5}
section h3{font-size:20px;color:var(--text-strong);margin:26px 0 12px;line-height:1.5}
section h4{font-size:17px;color:var(--text-strong);margin:16px 0 8px;line-height:1.5}
section p{margin-bottom:14px;color:var(--text-soft);font-size:15px}
.card{background:var(--card);border-radius:var(--radius);padding:26px;margin-bottom:20px;box-shadow:var(--shadow);border:1px solid var(--border);position:relative;overflow:hidden;transition:transform .38s var(--ease),box-shadow .38s var(--ease),border-color .38s var(--ease),background .4s var(--ease);will-change:transform}
.card::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--orange),var(--orange-light),#ffb703);transform:scaleX(0);transform-origin:left;transition:transform .45s var(--ease)}
.card:hover{transform:translateY(-6px);box-shadow:var(--shadow-hover);border-color:rgba(255,107,53,.35)}
.card:hover::before{transform:scaleX(1)}
.grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:20px}
.grid .card{margin-bottom:0;height:100%}
.tag{display:inline-block;background:var(--orange-soft);color:var(--orange);padding:3px 11px;border-radius:12px;font-size:13px;margin-right:8px;margin-bottom:6px;transition:background .25s var(--ease),color .25s var(--ease),transform .25s var(--ease);cursor:default}
.tag:hover{background:var(--orange);color:#fff;transform:translateY(-2px)}
.meta{font-size:13px;color:var(--text-muted);margin-bottom:10px;letter-spacing:.3px;display:flex;align-items:center;gap:8px}
.meta::before{content:"";width:6px;height:6px;border-radius:50%;background:linear-gradient(135deg,var(--orange),var(--orange-light));flex:none}
.faq-item{background:var(--card);border-radius:var(--radius-sm);margin-bottom:12px;overflow:hidden;box-shadow:var(--shadow);border:1px solid var(--border);transition:box-shadow .3s var(--ease),transform .3s var(--ease),border-color .3s var(--ease),background .4s var(--ease)}
.faq-item:hover{box-shadow:var(--shadow-hover);border-color:rgba(255,107,53,.3)}
.faq-item[open]{border-color:rgba(255,107,53,.4)}
.faq-item summary{padding:16px 20px;cursor:pointer;font-weight:600;color:var(--text-strong);font-size:15px;list-style:none;position:relative;transition:color .25s var(--ease),background .25s var(--ease);user-select:none}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::before{content:"+ ";color:var(--orange);font-weight:800;display:inline-block;transition:transform .3s var(--ease);margin-right:2px}
.faq-item[open] summary::before{content:"− "}
.faq-item summary:hover{color:var(--orange);background:var(--orange-soft)}
.faq-item .answer{padding:0 20px 18px;color:var(--text-soft);font-size:14px;line-height:1.85;animation:fadeUp .35s var(--ease) both}
.steps{counter-reset:step}
.step{background:var(--card);border-radius:var(--radius-sm);padding:22px 22px 22px 64px;margin-bottom:14px;position:relative;box-shadow:var(--shadow);border:1px solid var(--border);transition:transform .35s var(--ease),box-shadow .35s var(--ease),border-color .35s var(--ease),background .4s var(--ease)}
.step:hover{transform:translateX(6px);box-shadow:var(--shadow-hover);border-color:rgba(255,107,53,.35)}
.step::before{counter-increment:step;content:counter(step);position:absolute;left:18px;top:20px;width:32px;height:32px;background:linear-gradient(135deg,var(--orange),var(--orange-light));color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:15px;box-shadow:0 4px 12px rgba(255,107,53,.4);transition:transform .35s var(--ease)}
.step:hover::before{transform:scale(1.12) rotate(-6deg)}
.step h4{margin-top:0}
table{width:100%;border-collapse:collapse;margin:18px 0;font-size:14px;border-radius:var(--radius-sm);overflow:hidden;box-shadow:var(--shadow)}
th,td{border:1px solid var(--border);padding:11px 15px;text-align:left}
th{background:var(--orange-soft);color:var(--orange);font-weight:700}
tbody tr{transition:background .25s var(--ease)}
tbody tr:nth-child(even){background:var(--bg-alt)}
tbody tr:hover{background:var(--orange-soft)}
.breadcrumb{font-size:14px;color:var(--text-muted);padding:18px 0;display:flex;align-items:center;gap:6px;flex-wrap:wrap}
.breadcrumb a{color:var(--orange);position:relative}
.breadcrumb a:hover{text-decoration:none;opacity:.8}
footer{background:var(--footer-bg);color:var(--footer-text);padding:48px 0 22px;font-size:14px;position:relative;overflow:hidden}
footer::before{content:"";position:absolute;top:0;left:0;right:0;height:3px;background:linear-gradient(90deg,var(--orange),var(--orange-light),#ffb703)}
footer a{color:var(--orange-light);transition:color .25s var(--ease),padding-left .25s var(--ease)}
footer a:hover{color:#fff;text-decoration:none;padding-left:4px}
.footer-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:26px;margin-bottom:28px}
.footer-grid h4{color:#fff;margin-bottom:14px;font-size:16px;position:relative;padding-bottom:8px}
.footer-grid h4::after{content:"";position:absolute;left:0;bottom:0;width:28px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--orange),var(--orange-light))}
.footer-grid ul{list-style:none}
.footer-grid li{margin-bottom:8px}
.copyright{text-align:center;border-top:1px solid rgba(255,255,255,.08);padding-top:18px;color:#6f7787;font-size:13px;line-height:2}
.back-top{position:fixed;right:24px;bottom:24px;width:46px;height:46px;background:linear-gradient(135deg,var(--orange),var(--orange-light));color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;cursor:pointer;box-shadow:0 6px 20px rgba(255,107,53,.45);border:none;z-index:90;transition:transform .3s var(--ease),box-shadow .3s var(--ease),opacity .3s var(--ease);animation:popIn .5s var(--ease) both}
.back-top:hover{transform:translateY(-5px) scale(1.08);box-shadow:0 12px 28px rgba(255,107,53,.6)}
.back-top:active{transform:translateY(-2px) scale(.98)}
@keyframes popIn{from{opacity:0;transform:scale(.5)}to{opacity:1;transform:scale(1)}}
section, .card, .step, .faq-item{animation:revealUp .7s var(--ease) both}
@keyframes revealUp{from{opacity:0;transform:translateY(34px)}to{opacity:1;transform:translateY(0)}}
.grid .card:nth-child(1){animation-delay:.04s}
.grid .card:nth-child(2){animation-delay:.09s}
.grid .card:nth-child(3){animation-delay:.14s}
.grid .card:nth-child(4){animation-delay:.19s}
.grid .card:nth-child(5){animation-delay:.24s}
.grid .card:nth-child(6){animation-delay:.29s}
.grid .card:nth-child(7){animation-delay:.34s}
.grid .card:nth-child(8){animation-delay:.39s}
.grid .card:nth-child(9){animation-delay:.44s}
.grid .card:nth-child(10){animation-delay:.49s}
.steps .step:nth-child(1){animation-delay:.05s}
.steps .step:nth-child(2){animation-delay:.1s}
.steps .step:nth-child(3){animation-delay:.15s}
.steps .step:nth-child(4){animation-delay:.2s}
.steps .step:nth-child(5){animation-delay:.25s}
.steps .step:nth-child(6){animation-delay:.3s}
.faq-item:nth-child(odd){animation-delay:.05s}
.faq-item:nth-child(even){animation-delay:.1s}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important;scroll-behavior:auto !important}}
@media(max-width:992px){.hero h1{font-size:28px}.hero{padding:64px 0}section{padding:46px 0}}
@media(max-width:768px){.container{padding:0 16px}.hero{padding:52px 0}.hero h1{font-size:23px}.hero p{font-size:14.5px}.nav{padding:10px 0}.nav-links{gap:12px}.nav-links a{font-size:13px}.logo{font-size:20px}section{padding:38px 0}section h2{font-size:21px;margin-bottom:20px}section h3{font-size:18px}.card{padding:20px;border-radius:12px}.grid{grid-template-columns:1fr;gap:14px}.step{padding:18px 18px 18px 56px}.step::before{left:14px;top:16px;width:28px;height:28px;font-size:14px}th,td{padding:9px 11px;font-size:13px}.back-top{right:16px;bottom:16px;width:42px;height:42px;font-size:18px}.footer-grid{grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:18px}}
@media(max-width:480px){.hero h1{font-size:20px}.hero p{font-size:14px}section h2{font-size:19px}.card{padding:16px}.nav-links{gap:10px}.nav-links a{font-size:12.5px}.meta{font-size:12px}.copyright{font-size:12px}}
@media print{header,footer,.back-top,.hero::after{display:none}.card,.step,.faq-item{box-shadow:none;border:1px solid #ddd;break-inside:avoid}body{background:#fff;color:#000}}