/* ============ SAI2资源站 · 共享样式 ============ */
:root{
  --bg:#07070e;
  --bg-2:#0b0b16;
  --surface:rgba(255,255,255,.045);
  --surface-2:rgba(255,255,255,.07);
  --line:rgba(255,255,255,.09);
  --line-neon:rgba(168,85,247,.45);
  --purple:#a855f7;
  --violet:#7c3aed;
  --green:#00ff9d;
  --cyan:#22d3ee;
  --pink:#f472b6;
  --text:#eef0f6;
  --text-2:#a3a8c3;
  --text-3:#6f7490;
  --font-display:"Clash Display","Space Grotesk","Segoe UI",system-ui,-apple-system,"Microsoft YaHei",sans-serif;
  --font-body:"Space Grotesk","Segoe UI",system-ui,-apple-system,"Microsoft YaHei",sans-serif;
  --radius:18px;
  --radius-sm:12px;
  --nav-h:70px;
  --ease:cubic-bezier(.22,1,.36,1);
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);color:var(--text);
  font-family:var(--font-body);
  font-size:16px;line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
::selection{background:rgba(168,85,247,.45);color:#fff}
a{color:inherit;text-decoration:none}
img,svg{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
section{scroll-margin-top:calc(var(--nav-h) + 18px);position:relative}
[id]{scroll-margin-top:calc(var(--nav-h) + 24px)}

.bg-layer{position:fixed;inset:0;z-index:-2;pointer-events:none;
  background:
    radial-gradient(900px 520px at 12% -6%,rgba(124,58,237,.22),transparent 60%),
    radial-gradient(760px 480px at 92% 4%,rgba(0,255,157,.10),transparent 55%),
    radial-gradient(700px 700px at 50% 115%,rgba(34,211,238,.08),transparent 60%),
    var(--bg);
}
.bg-grid{position:fixed;inset:0;z-index:-1;pointer-events:none;opacity:.5;
  background-image:linear-gradient(rgba(255,255,255,.035) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.035) 1px,transparent 1px);
  background-size:64px 64px;
  mask-image:radial-gradient(ellipse 90% 70% at 50% 20%,#000 30%,transparent 75%);
  -webkit-mask-image:radial-gradient(ellipse 90% 70% at 50% 20%,#000 30%,transparent 75%);
}
.wrap{width:min(1200px,92%);margin:0 auto}

/* ============ 按钮 ============ */
.btn{display:inline-flex;align-items:center;gap:.55em;justify-content:center;
  font-weight:700;letter-spacing:.02em;border-radius:999px;
  transition:transform .3s var(--ease),box-shadow .3s var(--ease),background .3s;
  white-space:nowrap;
}
.btn:active{transform:scale(.97)}
.btn-neon{
  position:relative;overflow:hidden;color:#fff;
  background:linear-gradient(135deg,var(--violet) 0%,var(--purple) 48%,var(--green) 130%);
  box-shadow:0 0 18px rgba(168,85,247,.45);
  animation:breathe 2.6s ease-in-out infinite;
}
.btn-neon::before{
  content:"";position:absolute;top:0;bottom:0;width:55%;left:-70%;
  background:linear-gradient(110deg,transparent 0%,rgba(255,255,255,.55) 50%,transparent 100%);
  transform:skewX(-18deg);
  animation:shine 2.8s ease-in-out infinite;
}
@keyframes shine{0%{left:-70%}60%,100%{left:135%}}
@keyframes breathe{
  0%,100%{box-shadow:0 0 16px rgba(168,85,247,.5),0 0 0 rgba(0,255,157,0)}
  50%{box-shadow:0 0 30px rgba(168,85,247,.75),0 0 46px rgba(0,255,157,.35)}
}
.btn-neon:hover{transform:translateY(-2px)}
.btn-lg{padding:1.05rem 2.3rem;font-size:1.08rem}
.btn-md{padding:.82rem 1.7rem;font-size:.98rem}
.btn-sm{padding:.55rem 1.15rem;font-size:.85rem;border-radius:10px}
.btn-ghost{color:var(--text);background:rgba(255,255,255,.05);border:1px solid var(--line)}
.btn-ghost:hover{border-color:var(--line-neon);background:rgba(168,85,247,.12);transform:translateY(-2px)}
.btn-line{color:var(--green);border:1px solid rgba(0,255,157,.4);background:rgba(0,255,157,.06)}
.btn-line:hover{background:rgba(0,255,157,.14);transform:translateY(-2px)}

/* ============ 导航栏 ============ */
.site-header{
  position:fixed;top:0;left:0;right:0;z-index:100;height:var(--nav-h);
  background:rgba(9,9,18,.52);
  backdrop-filter:blur(18px) saturate(150%);
  -webkit-backdrop-filter:blur(18px) saturate(150%);
  border-bottom:1px solid transparent;
  transition:border-color .4s,background .4s;
}
.site-header.scrolled{background:rgba(9,9,18,.82);border-bottom-color:var(--line)}
.nav-inner{height:var(--nav-h);display:flex;align-items:center;gap:2rem}
.logo{display:flex;align-items:center;gap:.6rem;font-family:var(--font-display);font-weight:800;font-size:1.22rem;letter-spacing:.01em}
.logo-mark{width:34px;height:34px;border-radius:9px;flex:none;
  background:conic-gradient(from 210deg,var(--violet),var(--green),var(--cyan),var(--violet));
  display:grid;place-items:center;box-shadow:0 0 16px rgba(168,85,247,.55)}
.logo-mark svg{width:19px;height:19px}
.logo b{background:linear-gradient(90deg,#fff 30%,var(--green));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.logo i{font-style:normal;color:var(--text-3);font-weight:600;font-size:.72em;letter-spacing:.14em}
.nav-links{display:flex;align-items:center;gap:.4rem;margin-left:auto}
.nav-links a:not(.btn){
  position:relative;padding:.5rem .9rem;font-size:.95rem;font-weight:600;color:var(--text-2);border-radius:10px;
  transition:color .25s,background .25s;
}
.nav-links a:not(.btn):hover{color:#fff;background:rgba(255,255,255,.06)}
.nav-links a.active{color:var(--green)}
.nav-cta{margin-left:.6rem}
.nav-burger{display:none;margin-left:auto;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);place-items:center;background:rgba(255,255,255,.04)}
.nav-burger span{display:block;width:20px;height:2px;background:#fff;border-radius:2px;position:relative;transition:.3s}
.nav-burger span::before,.nav-burger span::after{content:"";position:absolute;left:0;width:20px;height:2px;background:#fff;border-radius:2px;transition:.3s}
.nav-burger span::before{top:-6px}.nav-burger span::after{top:6px}
.site-header.open .nav-burger span{background:transparent}
.site-header.open .nav-burger span::before{top:0;transform:rotate(45deg)}
.site-header.open .nav-burger span::after{top:0;transform:rotate(-45deg)}

/* ============ 页头 ============ */
.page-hero{padding:calc(var(--nav-h) + 72px) 0 56px;position:relative;overflow:hidden}
.page-hero .orb{position:absolute;border-radius:50%;filter:blur(80px);pointer-events:none}
.page-hero .orb.a{width:420px;height:420px;left:-120px;top:-80px;background:rgba(124,58,237,.32)}
.page-hero .orb.b{width:340px;height:340px;right:-90px;bottom:-120px;background:rgba(0,255,157,.13)}
.crumbs{display:flex;align-items:center;gap:.5rem;font-size:.82rem;color:var(--text-3);margin-bottom:1.15rem;flex-wrap:wrap}
.crumbs a{transition:color .25s}
.crumbs a:hover{color:var(--green)}
.crumbs .sep{opacity:.5}
.page-hero h1{font-family:var(--font-display);font-size:clamp(2rem,4.6vw,3.3rem);font-weight:900;line-height:1.15;letter-spacing:-.01em;position:relative;z-index:1}
.page-hero h1 .grad{background:linear-gradient(92deg,var(--purple) 5%,var(--pink) 40%,var(--green) 95%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.page-hero .sub{color:var(--text-2);margin-top:1rem;max-width:44em;position:relative;z-index:1}
.page-hero .sub a,.crumbs a.go{color:var(--green);font-weight:700;border-bottom:1px dashed rgba(0,255,157,.5)}
.page-hero .sub a:hover{opacity:.75}
.hero-ctas{display:flex;gap:1rem;flex-wrap:wrap;margin-top:1.8rem;position:relative;z-index:1}
.eyebrow{
  display:inline-flex;align-items:center;gap:.6rem;padding:.42rem 1rem;border-radius:999px;
  border:1px solid var(--line-neon);background:rgba(168,85,247,.1);
  font-size:.8rem;font-weight:700;letter-spacing:.22em;color:#d3b8ff;text-transform:uppercase;
}
.eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--green);box-shadow:0 0 10px var(--green);animation:blink 1.6s ease-in-out infinite}
@keyframes blink{50%{opacity:.35}}

/* ============ 区块标题 ============ */
.sec{padding:72px 0}
.sec-head{margin-bottom:2.6rem;max-width:680px}
.sec-head .eyebrow{margin-bottom:1rem}
.sec-head h2{font-family:var(--font-display);font-size:clamp(1.7rem,3.2vw,2.5rem);font-weight:900;line-height:1.2}
.sec-head h2 .grad{background:linear-gradient(92deg,var(--purple),var(--green));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.sec-head p{color:var(--text-2);margin-top:.8rem}
.sec-head p a{color:var(--green);font-weight:700}
.sec-head p a:hover{opacity:.75}

/* ============ 卡片 ============ */
.card-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.2rem}
.res-card{
  border-radius:var(--radius);overflow:hidden;background:var(--surface);border:1px solid var(--line);
  backdrop-filter:blur(10px);display:flex;flex-direction:column;
  transition:transform .4s var(--ease),border-color .4s,box-shadow .4s;
}
.res-card:hover{transform:translateY(-6px);border-color:var(--line-neon);box-shadow:0 26px 50px rgba(0,0,0,.5)}
.cover{position:relative;aspect-ratio:16/9;overflow:hidden;display:grid;place-items:center}
.cover .cov-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:24px 24px;opacity:.5}
.cover svg{position:relative;width:56%;height:auto;transition:transform .5s var(--ease)}
.res-card:hover .cover svg{transform:scale(1.07) rotate(-1.2deg)}
.cov-1{background:linear-gradient(135deg,#1b1035,#3b1263 60%,#123)}
.cov-2{background:linear-gradient(135deg,#0d2b22,#0b3d2e 55%,#123)}
.cov-3{background:linear-gradient(135deg,#251236,#4a1259 60%,#123)}
.cov-4{background:linear-gradient(135deg,#0f2438,#0e3a52 60%,#123)}
.cov-5{background:linear-gradient(135deg,#33121f,#59123b 60%,#123)}
.cov-6{background:linear-gradient(135deg,#2d2410,#4a3a0e 60%,#123)}
.cov-7{background:linear-gradient(135deg,#0e2b33,#145262 60%,#123)}
.cov-8{background:linear-gradient(135deg,#2a1030,#521a5e 60%,#123)}
.res-body{padding:1.35rem 1.4rem 1.5rem;display:flex;flex-direction:column;flex:1}
.tag-row{display:flex;gap:.5rem;flex-wrap:wrap;margin-bottom:.85rem}
.tag{padding:.22rem .7rem;border-radius:999px;font-size:.72rem;font-weight:700;letter-spacing:.05em;border:1px solid}
.tag.lv1{color:#7dffc9;border-color:rgba(0,255,157,.4);background:rgba(0,255,157,.07)}
.tag.lv2{color:#c9a7ff;border-color:rgba(168,85,247,.45);background:rgba(168,85,247,.1)}
.tag.lv3{color:#ff9ecb;border-color:rgba(244,114,182,.45);background:rgba(244,114,182,.08)}
.tag.cat{color:var(--text-2);border-color:var(--line);background:rgba(255,255,255,.04)}
.res-body h3{font-family:var(--font-display);font-size:1.14rem;font-weight:800;line-height:1.4;margin-bottom:.5rem}
.res-body>p{color:var(--text-2);font-size:.88rem;flex:1}
.res-body>p a,.prose a,.faq-a-inner a,.tut-desc a,.notice a,.step p a,.channel-card p a,.channel-card ul a{color:var(--green);font-weight:700;border-bottom:1px dashed rgba(0,255,157,.5)}
.res-body>p a:hover,.prose a:hover,.faq-a-inner a:hover,.tut-desc a:hover,.notice a:hover,.step p a:hover{opacity:.75}
.res-foot{display:flex;align-items:center;justify-content:space-between;margin-top:1.2rem;padding-top:1rem;border-top:1px solid var(--line)}
.res-foot .meta{font-size:.78rem;color:var(--text-3)}
.res-foot .meta b{color:var(--green)}

/* ============ 教程列表 ============ */
.tut-list{display:grid;gap:1rem}
.tut-item{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);
  backdrop-filter:blur(10px);padding:1.6rem 1.8rem;
  transition:border-color .35s,box-shadow .35s,transform .35s var(--ease);
}
.tut-item:hover{border-color:var(--line-neon);box-shadow:0 18px 40px rgba(0,0,0,.45);transform:translateY(-3px)}
.tut-item .tag-row{margin-bottom:.7rem}
.tut-item h3{font-family:var(--font-display);font-size:1.22rem;font-weight:800;margin-bottom:.5rem}
.tut-item h3 .num{color:var(--text-3);font-size:.8em;margin-right:.5rem;font-weight:700}
.tut-desc{color:var(--text-2);font-size:.93rem}
.tut-more{margin-top:1rem;border-top:1px dashed rgba(255,255,255,.1);padding-top:.9rem}
.tut-more summary{cursor:pointer;font-size:.88rem;font-weight:700;color:var(--cyan);list-style:none;display:inline-flex;align-items:center;gap:.45rem;transition:opacity .25s}
.tut-more summary::-webkit-details-marker{display:none}
.tut-more summary::after{content:"▾";transition:transform .3s}
.tut-more[open] summary::after{transform:rotate(180deg)}
.tut-more summary:hover{opacity:.75}
.tut-more ul{margin:.75rem 0 0 1.2rem;color:var(--text-2);font-size:.9rem;display:grid;gap:.4rem}
.tut-more ul b{color:var(--text)}
.tut-meta{display:flex;gap:1.4rem;margin-top:1rem;font-size:.78rem;color:var(--text-3);flex-wrap:wrap}
.tut-meta b{color:var(--green)}
.cat-nav{display:flex;gap:.7rem;flex-wrap:wrap;margin-bottom:2.4rem}

/* ============ 表格 ============ */
.spec-table{width:100%;border-collapse:collapse;border-radius:var(--radius);overflow:hidden;border:1px solid var(--line);background:var(--surface);font-size:.93rem}
.spec-table th,.spec-table td{padding:.95rem 1.2rem;text-align:left;border-bottom:1px solid var(--line)}
.spec-table th{background:rgba(124,58,237,.14);font-family:var(--font-display);font-weight:800;letter-spacing:.04em;color:#d3b8ff;font-size:.85rem}
.spec-table tr:last-child td{border-bottom:none}
.spec-table td:first-child{color:var(--text-2);font-weight:600;white-space:nowrap}
.spec-table td b{color:var(--green)}
.spec-table a{color:var(--green);font-weight:700}
.table-scroll{overflow-x:auto;border-radius:var(--radius)}

/* ============ 步骤 ============ */
.steps{display:grid;gap:1rem;counter-reset:step}
.step{
  position:relative;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--surface);backdrop-filter:blur(10px);
  padding:1.4rem 1.6rem 1.4rem 4.6rem;counter-increment:step;
  transition:border-color .35s,transform .35s var(--ease);
}
.step:hover{border-color:var(--line-neon);transform:translateX(4px)}
.step::before{
  content:counter(step,decimal-leading-zero);
  position:absolute;left:1.4rem;top:1.35rem;
  font-family:var(--font-display);font-weight:900;font-size:1.3rem;
  background:linear-gradient(135deg,var(--purple),var(--green));
  -webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent;
}
.step h3{font-family:var(--font-display);font-size:1.06rem;font-weight:800;margin-bottom:.35rem}
.step p{color:var(--text-2);font-size:.9rem}

/* ============ 渠道卡 ============ */
.channel-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.2rem}
.channel-card{
  border:1px solid var(--line);border-radius:var(--radius);background:var(--surface);
  backdrop-filter:blur(10px);padding:2rem;display:flex;flex-direction:column;gap:.9rem;
  transition:border-color .35s,box-shadow .35s,transform .35s var(--ease);
}
.channel-card:hover{border-color:var(--line-neon);box-shadow:0 20px 44px rgba(0,0,0,.5);transform:translateY(-4px)}
.channel-card.best{border-color:rgba(0,255,157,.4);background:linear-gradient(160deg,rgba(0,255,157,.07),rgba(255,255,255,.02) 50%),var(--surface)}
.ch-badge{align-self:flex-start;font-size:.72rem;font-weight:800;letter-spacing:.1em;padding:.28rem .8rem;border-radius:999px;color:#052e1c;background:linear-gradient(90deg,var(--green),#7dffc9)}
.ch-badge.alt{color:#2a1a4d;background:linear-gradient(90deg,#c9a7ff,#8b5cf6)}
.channel-card h3{font-family:var(--font-display);font-size:1.3rem;font-weight:800}
.channel-card p{color:var(--text-2);font-size:.92rem;flex:1}
.channel-card ul{list-style:none;display:grid;gap:.45rem}
.channel-card ul li{display:flex;gap:.55rem;align-items:baseline;color:var(--text-2);font-size:.88rem}
.channel-card ul li::before{content:"✦";color:var(--green);font-size:.75rem;flex:none}

/* ============ 提示块 ============ */
.notice{
  display:flex;gap:1rem;align-items:flex-start;
  border:1px solid rgba(34,211,238,.35);border-radius:var(--radius);
  background:rgba(34,211,238,.07);padding:1.2rem 1.5rem;margin:1.6rem 0;
  color:var(--text-2);font-size:.92rem;
}
.notice .ico{flex:none;font-size:1.2rem;line-height:1.4}
.notice.warn{border-color:rgba(253,224,71,.35);background:rgba(253,224,71,.06)}
.notice b{color:var(--text)}

/* ============ 正文排版 ============ */
.prose{max-width:860px;color:var(--text-2)}
.prose p{margin-bottom:1rem}
.prose h2{font-family:var(--font-display);color:var(--text);font-size:1.5rem;font-weight:900;margin:2.2rem 0 .9rem}
.prose h3{font-family:var(--font-display);color:var(--text);font-size:1.15rem;font-weight:800;margin:1.6rem 0 .7rem}
.prose ul,.prose ol{margin:0 0 1.2rem 1.3rem;display:grid;gap:.45rem}
.prose b,.prose strong{color:var(--text)}
.prose code{font-family:Consolas,monospace;font-size:.86em;color:#7dffc9;background:rgba(0,255,157,.08);border:1px solid rgba(0,255,157,.2);padding:.1em .45em;border-radius:6px}

/* ============ 笔刷 ============ */
.brush-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1.1rem}
.brush-card{
  border-radius:var(--radius);overflow:hidden;background:var(--surface);border:1px solid var(--line);
  backdrop-filter:blur(10px);display:flex;flex-direction:column;
  transition:transform .4s var(--ease),border-color .4s,box-shadow .4s;
}
.brush-card:hover{transform:translateY(-6px);border-color:rgba(0,255,157,.4);box-shadow:0 24px 46px rgba(0,0,0,.5),0 0 26px rgba(0,255,157,.14)}
.brush-cover{position:relative;aspect-ratio:16/10;background:#0a0a14;overflow:hidden;display:grid;place-items:center}
.brush-cover svg{width:82%;height:auto;transition:transform .5s var(--ease)}
.brush-card:hover .brush-cover svg{transform:scale(1.06)}
.brush-body{padding:1.1rem 1.2rem 1.25rem;display:flex;flex-direction:column;flex:1;gap:.55rem}
.brush-body h3{font-size:1rem;font-weight:800;font-family:var(--font-display)}
.brush-meta{display:flex;align-items:center;justify-content:space-between;font-size:.76rem;color:var(--text-3);margin-top:auto;padding-top:.4rem;gap:.6rem;flex-wrap:wrap}
.brush-meta b{color:var(--text-2);font-weight:700}
.brush-hero-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:2.6rem;align-items:center}
.brush-hero-cover{border-radius:22px;overflow:hidden;border:1px solid var(--line-neon);background:#0a0a14;aspect-ratio:16/10;display:grid;place-items:center;box-shadow:0 26px 60px rgba(0,0,0,.55),0 0 40px rgba(124,58,237,.25)}
.brush-hero-cover svg{width:84%;height:auto}
.meta-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:.8rem;margin-top:1.4rem}
.meta-cell{border:1px solid var(--line);border-radius:var(--radius-sm);background:var(--surface);padding:.8rem 1rem}
.meta-cell span{display:block;font-size:.72rem;color:var(--text-3);letter-spacing:.08em;margin-bottom:.2rem}
.meta-cell b{font-family:var(--font-display);font-size:.98rem;color:var(--green)}

/* ============ FAQ ============ */
.faq-box{border-radius:22px;border:1px solid var(--line);background:linear-gradient(160deg,rgba(124,58,237,.09),rgba(255,255,255,.02) 45%),var(--surface);backdrop-filter:blur(12px);padding:2.2rem;position:relative;overflow:hidden}
.faq-box::before{content:"";position:absolute;top:-120px;right:-100px;width:340px;height:340px;border-radius:50%;background:rgba(0,255,157,.1);filter:blur(70px);pointer-events:none}
.faq-search{position:relative;max-width:620px;margin:0 auto 1.2rem}
.faq-search svg.mag{position:absolute;left:1.15rem;top:50%;transform:translateY(-50%);width:19px;height:19px;color:var(--text-3);pointer-events:none}
.faq-search input{
  width:100%;padding:1.05rem 3.4rem 1.05rem 3.1rem;border-radius:999px;
  background:rgba(10,10,20,.7);border:1px solid var(--line);color:var(--text);
  font-size:1rem;font-family:inherit;outline:none;transition:border-color .3s,box-shadow .3s;
}
.faq-search input::placeholder{color:var(--text-3)}
.faq-search input:focus{border-color:var(--line-neon);box-shadow:0 0 0 4px rgba(168,85,247,.16),0 0 24px rgba(168,85,247,.25)}
.faq-search .clear-btn{position:absolute;right:.7rem;top:50%;transform:translateY(-50%);width:32px;height:32px;border-radius:50%;background:rgba(255,255,255,.08);color:var(--text-2);font-size:1rem;display:none;place-items:center;line-height:1}
.faq-search.has-text .clear-btn{display:grid}
.hot-keys{display:flex;justify-content:center;gap:.6rem;flex-wrap:wrap;margin-bottom:1.4rem}
.hot-keys button{padding:.34rem .9rem;border-radius:999px;border:1px solid var(--line);background:rgba(255,255,255,.03);font-size:.78rem;color:var(--text-2);font-weight:600;transition:.25s}
.hot-keys button:hover{border-color:var(--line-neon);color:#fff;background:rgba(168,85,247,.14)}
.faq-count{text-align:center;font-size:.82rem;color:var(--text-3);margin-bottom:1.4rem}
.faq-count b{color:var(--green)}
.faq-list{display:grid;gap:.8rem;position:relative;z-index:1}
.faq-item{border:1px solid var(--line);border-radius:14px;background:rgba(10,10,20,.55);overflow:hidden;transition:border-color .3s,box-shadow .3s}
.faq-item.open{border-color:var(--line-neon);box-shadow:0 10px 30px rgba(0,0,0,.4)}
.faq-q{width:100%;display:flex;align-items:center;gap:1rem;padding:1.15rem 1.4rem;text-align:left;font-size:.99rem;font-weight:700;color:var(--text);transition:background .25s}
.faq-q:hover{background:rgba(255,255,255,.03)}
.code-chip{flex:none;font-size:.72rem;font-weight:800;letter-spacing:.08em;color:#052e1c;background:linear-gradient(90deg,var(--green),#7dffc9);padding:.2rem .6rem;border-radius:7px;font-family:var(--font-display)}
.faq-q .chev{margin-left:auto;flex:none;width:22px;height:22px;color:var(--text-3);transition:transform .35s var(--ease),color .3s}
.faq-item.open .chev{transform:rotate(180deg);color:var(--green)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .45s var(--ease)}
.faq-a-inner{color:var(--text-2);font-size:.93rem;border-top:1px dashed rgba(255,255,255,.08);margin:0 1.4rem;padding:1.1rem 0 1.4rem}
.faq-a-inner ol{margin:.6rem 0 0 1.2rem;display:grid;gap:.35rem}
.faq-empty{display:none;text-align:center;padding:3rem 1rem;color:var(--text-3)}
.faq-empty.show{display:block}
.faq-empty .big{font-size:2.4rem;margin-bottom:.6rem}
.faq-empty p{margin-bottom:1.2rem}

/* ============ 相关链接条 ============ */
.rel-links{display:flex;gap:.8rem;flex-wrap:wrap;margin-top:1.6rem}
.rel-chip{
  display:inline-flex;align-items:center;gap:.5rem;padding:.6rem 1.1rem;border-radius:999px;
  border:1px solid var(--line);background:var(--surface);font-size:.86rem;font-weight:700;color:var(--text-2);
  transition:.3s;
}
.rel-chip:hover{border-color:var(--line-neon);color:#fff;background:rgba(168,85,247,.14);transform:translateY(-2px)}
.rel-chip .arr{color:var(--green)}

/* ============ Footer ============ */
.site-footer{border-top:1px solid var(--line);background:rgba(6,6,12,.7);padding:70px 0 0;margin-top:80px}
.foot-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:2.6rem;padding-bottom:3rem}
.foot-brand p{color:var(--text-2);font-size:.9rem;margin:1rem 0 1.4rem;max-width:30em}
.socials{display:flex;gap:.7rem}
.socials a{width:40px;height:40px;border-radius:11px;border:1px solid var(--line);display:grid;place-items:center;color:var(--text-2);transition:.3s}
.socials a:hover{color:#fff;border-color:var(--line-neon);background:rgba(168,85,247,.15);transform:translateY(-3px)}
.socials svg{width:18px;height:18px}
.foot-col h4{font-family:var(--font-display);font-size:.95rem;font-weight:800;letter-spacing:.08em;margin-bottom:1.1rem;color:var(--text)}
.foot-col ul{list-style:none;display:grid;gap:.6rem}
.foot-col a{color:var(--text-2);font-size:.88rem;transition:color .25s,padding-left .25s}
.foot-col a:hover{color:var(--green);padding-left:4px}
.foot-bottom{border-top:1px solid var(--line);padding:1.4rem 0;display:flex;justify-content:space-between;gap:1rem;flex-wrap:wrap;color:var(--text-3);font-size:.8rem}

/* ============ 浮层组件 ============ */
.toast{
  position:fixed;left:50%;bottom:34px;transform:translate(-50%,20px);z-index:200;
  padding:.95rem 1.6rem;border-radius:14px;max-width:min(92vw,480px);
  background:rgba(16,15,30,.92);border:1px solid var(--line-neon);backdrop-filter:blur(14px);
  color:var(--text);font-size:.92rem;font-weight:600;text-align:center;
  opacity:0;pointer-events:none;transition:.4s var(--ease);
  box-shadow:0 18px 44px rgba(0,0,0,.5),0 0 24px rgba(168,85,247,.3);
}
.toast.show{opacity:1;transform:translate(-50%,0)}
.backtop{
  position:fixed;right:26px;bottom:26px;z-index:90;width:46px;height:46px;border-radius:13px;
  border:1px solid var(--line-neon);background:rgba(15,14,28,.8);backdrop-filter:blur(10px);
  display:grid;place-items:center;color:var(--green);
  opacity:0;pointer-events:none;transform:translateY(12px);transition:.35s var(--ease);
}
.backtop.show{opacity:1;pointer-events:auto;transform:none}
.backtop:hover{box-shadow:0 0 22px rgba(0,255,157,.35)}

/* ============ 滚动浮现 ============ */
.reveal{opacity:0;transform:translateY(28px);transition:opacity .8s var(--ease),transform .8s var(--ease)}
.reveal.visible{opacity:1;transform:none}
.reveal[data-delay="1"]{transition-delay:.1s}
.reveal[data-delay="2"]{transition-delay:.2s}
.reveal[data-delay="3"]{transition-delay:.3s}

/* ============ 响应式 ============ */
@media (max-width:1024px){
  .card-grid{grid-template-columns:repeat(2,1fr)}
  .brush-grid{grid-template-columns:repeat(2,1fr)}
  .channel-grid{grid-template-columns:1fr}
  .brush-hero-grid{grid-template-columns:1fr;gap:2rem}
  .foot-grid{grid-template-columns:1fr 1fr}
}
@media (max-width:760px){
  .nav-links{
    position:fixed;top:var(--nav-h);left:0;right:0;z-index:99;
    flex-direction:column;align-items:stretch;gap:.4rem;
    padding:1.2rem 4%;background:rgba(8,8,16,.96);backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
    transform:translateY(-12px);opacity:0;pointer-events:none;transition:.3s var(--ease);
  }
  .site-header.open .nav-links{transform:none;opacity:1;pointer-events:auto}
  .nav-links a:not(.btn){padding:.9rem 1rem;font-size:1.05rem}
  .nav-cta{margin:0.4rem 0 0;width:100%}
  .nav-burger{display:grid}
  .faq-box{padding:1.5rem 1.1rem}
  .foot-grid{grid-template-columns:1fr;gap:2rem}
  .brush-hero-cover{max-width:560px}
}
@media (max-width:560px){
  .card-grid,.brush-grid{grid-template-columns:1fr}
  .meta-grid{grid-template-columns:1fr}
  .backtop{right:14px;bottom:14px}
  .step{padding-left:4rem}
}
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms !important;animation-iteration-count:1 !important;transition-duration:.01ms !important}
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none}
}
:focus-visible{outline:2px solid var(--green);outline-offset:3px;border-radius:6px}