/* ==========================================================================
   牛码AI宇宙 · AI 实战教程
   clawguide.cn — style.css
   ========================================================================== */

:root{
  --bg:#07070d;
  --bg2:#0b0b16;
  --card:rgba(255,255,255,.035);
  --card-hover:rgba(255,255,255,.06);
  --line:rgba(255,255,255,.09);
  --txt:#eceaf6;
  --muted:#9b98b3;
  --violet:#7c5cff;
  --cyan:#00d4ff;
  --pink:#ff4ecd;
  --grad:linear-gradient(100deg,#7c5cff 0%,#00d4ff 50%,#ff4ecd 100%);
  --radius:18px;
  --maxw:1180px;
}

*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  background:var(--bg);
  color:var(--txt);
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
::selection{background:rgba(124,92,255,.4)}
a{color:inherit;text-decoration:none}
img{max-width:100%}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px}

/* ---------- 背景 ---------- */
#bg{position:fixed;inset:0;z-index:0;pointer-events:none}
.aurora{position:fixed;inset:0;z-index:0;pointer-events:none;overflow:hidden}
.aurora i{
  position:absolute;border-radius:50%;filter:blur(110px);opacity:.24;
  animation:drift 22s ease-in-out infinite alternate;
}
.aurora i:nth-child(1){width:520px;height:520px;background:#7c5cff;top:-160px;left:-120px}
.aurora i:nth-child(2){width:440px;height:440px;background:#00d4ff;top:22%;right:-140px;animation-delay:-7s}
.aurora i:nth-child(3){width:480px;height:480px;background:#ff4ecd;bottom:-180px;left:28%;animation-delay:-14s;opacity:.18}
@keyframes drift{
  0%{transform:translate(0,0) scale(1)}
  100%{transform:translate(70px,-50px) scale(1.18)}
}
main,header,footer{position:relative;z-index:1}

/* ---------- 通用渐变字 ---------- */
.grad{
  background:var(--grad);
  -webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;color:transparent;
}

/* ---------- 导航 ---------- */
.nav{
  position:fixed;top:0;left:0;right:0;z-index:50;
  padding:16px 0;transition:.35s;
}
.nav.scrolled{
  background:rgba(7,7,13,.72);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--line);
  padding:10px 0;
}
.nav .wrap{display:flex;align-items:center;gap:28px}
.logo{display:flex;align-items:center;gap:10px;font-size:17px;font-weight:600;letter-spacing:.5px}
.logo b{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.logo-mark{
  width:34px;height:34px;border-radius:10px;display:grid;place-items:center;
  background:var(--grad);color:#fff;font-weight:800;font-size:17px;
  box-shadow:0 0 22px rgba(124,92,255,.55);
}
.menu{display:flex;gap:26px;margin-left:auto;font-size:14px;color:var(--muted)}
.menu a{position:relative;transition:.25s}
.menu a:hover{color:var(--txt)}
.menu a::after{
  content:"";position:absolute;left:0;bottom:-5px;height:2px;width:0;
  background:var(--grad);transition:.3s;border-radius:2px;
}
.menu a:hover::after{width:100%}
.nav-cta{
  font-size:13.5px;font-weight:600;padding:8px 18px;border-radius:99px;
  border:1px solid rgba(124,92,255,.5);color:#dcd6ff;transition:.25s;
}
.nav-cta:hover{background:rgba(124,92,255,.18);box-shadow:0 0 24px rgba(124,92,255,.35)}
.burger{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;margin-left:auto}
.burger span{width:22px;height:2px;background:var(--txt);border-radius:2px;transition:.3s}

/* ---------- HERO ---------- */
.hero{
  min-height:100svh;display:flex;flex-direction:column;justify-content:center;
  padding:130px 0 70px;position:relative;
}
.eyebrow{
  display:inline-block;font-size:12.5px;letter-spacing:2.5px;color:#b9b3e8;
  border:1px solid rgba(124,92,255,.4);border-radius:99px;padding:6px 16px;
  background:rgba(124,92,255,.09);margin-bottom:26px;width:max-content;
}
.hero h1{
  font-size:clamp(40px,7vw,78px);line-height:1.12;font-weight:800;letter-spacing:-1px;
}
.hero-sub{margin-top:24px;font-size:clamp(15px,1.6vw,18px);color:var(--muted);max-width:620px}
.hero-btns{display:flex;gap:14px;margin-top:36px;flex-wrap:wrap}
.btn{
  display:inline-flex;align-items:center;gap:8px;padding:13px 28px;border-radius:99px;
  font-size:15px;font-weight:600;transition:.28s;cursor:pointer;
}
.btn-primary{
  background:var(--grad);color:#fff;
  box-shadow:0 8px 30px rgba(124,92,255,.4);
}
.btn-primary:hover{transform:translateY(-3px);box-shadow:0 14px 44px rgba(0,212,255,.45)}
.btn-ghost{
  border:1px solid var(--line);color:var(--txt);background:rgba(255,255,255,.03);
}
.btn-ghost:hover{border-color:rgba(124,92,255,.6);background:rgba(124,92,255,.12)}
.hero-tags{display:flex;gap:10px;flex-wrap:wrap;margin-top:40px}
.hero-tags span{
  font-size:12.5px;color:var(--muted);padding:6px 14px;border-radius:99px;
  border:1px solid var(--line);background:rgba(255,255,255,.025);
}
.scroll-hint{
  position:absolute;bottom:26px;left:50%;transform:translateX(-50%);
  width:24px;height:40px;border:1.5px solid rgba(255,255,255,.22);border-radius:14px;
}
.scroll-hint span{
  position:absolute;left:50%;top:8px;width:4px;height:8px;margin-left:-2px;
  background:var(--grad);border-radius:4px;animation:wheel 1.8s infinite;
}
@keyframes wheel{0%{transform:translateY(0);opacity:1}100%{transform:translateY(16px);opacity:0}}

/* ---------- 数字条 ---------- */
.stats{padding:20px 0 70px}
.stats-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(255,255,255,.025);padding:34px 20px;
  backdrop-filter:blur(8px);
}
.stat{text-align:center}
.stat b{font-size:clamp(28px,3.4vw,42px);font-weight:800}
.stat i{font-style:normal;font-size:18px;color:var(--muted);margin-left:2px}
.stat span{display:block;font-size:13px;color:var(--muted);margin-top:4px}

/* ---------- 区块标题 ---------- */
.section{padding:90px 0}
.sec-tag{
  font-size:11.5px;letter-spacing:4px;color:var(--cyan);
  text-transform:uppercase;margin-bottom:10px;
}
.sec-title{font-size:clamp(28px,4vw,42px);font-weight:800;letter-spacing:-.5px}
.sec-sub{color:var(--muted);margin-top:12px;max-width:600px}

/* ---------- 分类 ---------- */
.cat-grid{
  display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:48px;
}
.cat{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:30px 26px;transition:.32s;position:relative;overflow:hidden;
}
.cat::before{
  content:"";position:absolute;inset:0;opacity:0;transition:.32s;
  background:radial-gradient(420px circle at var(--mx,50%) var(--my,0%),rgba(124,92,255,.14),transparent 60%);
}
.cat:hover{transform:translateY(-6px);border-color:rgba(124,92,255,.45);background:var(--card-hover)}
.cat:hover::before{opacity:1}
.cat>*{position:relative}
.cat-icon{
  width:50px;height:50px;border-radius:14px;display:grid;place-items:center;margin-bottom:18px;
}
.cat-icon svg{width:24px;height:24px}
.c1{background:rgba(124,92,255,.16);color:#a48fff}
.c2{background:rgba(0,212,255,.14);color:#4ddcff}
.c3{background:rgba(255,78,205,.14);color:#ff7ad6}
.c4{background:rgba(99,153,34,.16);color:#a5d45e}
.c5{background:rgba(255,159,39,.14);color:#ffb45e}
.c6{background:rgba(29,158,117,.16);color:#4fd6ab}
.cat h3{font-size:18px;font-weight:700;margin-bottom:8px}
.cat p{font-size:14px;color:var(--muted)}
.cat em{
  display:inline-block;font-style:normal;font-size:12px;color:#c9c4e8;
  margin-top:16px;padding:4px 12px;border-radius:99px;
  border:1px solid var(--line);background:rgba(255,255,255,.03);
}

/* ---------- 筛选 ---------- */
.filters{display:flex;gap:10px;margin-top:38px;flex-wrap:wrap}
.chip{
  padding:8px 20px;border-radius:99px;font-size:13.5px;cursor:pointer;
  border:1px solid var(--line);background:rgba(255,255,255,.03);color:var(--muted);transition:.25s;
  font-family:inherit;
}
.chip:hover{color:var(--txt);border-color:rgba(124,92,255,.5)}
.chip.on{
  background:var(--grad);color:#fff;border-color:transparent;
  box-shadow:0 4px 20px rgba(124,92,255,.35);
}

/* ---------- 教程卡片 ---------- */
.tut-grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:30px;
}
.tut{
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;display:flex;flex-direction:column;gap:10px;transition:.32s;
}
.tut:hover{
  transform:translateY(-6px);background:var(--card-hover);
  border-color:rgba(0,212,255,.4);box-shadow:0 18px 40px rgba(0,0,0,.45);
}
.tut.hide{display:none}
.tut-top{display:flex;justify-content:space-between;align-items:center}
.tag{font-size:11.5px;padding:3px 11px;border-radius:99px;font-weight:600}
.t-beginner{background:rgba(99,153,34,.18);color:#b6e37a}
.t-mid{background:rgba(0,212,255,.15);color:#5fdfff}
.t-pro{background:rgba(255,78,205,.16);color:#ff85d8}
.time{font-size:12px;color:var(--muted)}
.tut h3{font-size:15.5px;font-weight:700;line-height:1.5}
.tut p{font-size:13px;color:var(--muted);flex:1}
.tut-foot span{
  font-size:12px;color:#8f8bad;border-top:1px solid var(--line);
  padding-top:10px;display:block;
}
.more{margin-top:34px;text-align:center;color:var(--muted);font-size:14px}
.more b{color:var(--cyan)}

/* ---------- 学习路径 ---------- */
.path-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;margin-top:48px}
.step{
  position:relative;background:var(--card);border:1px solid var(--line);
  border-radius:var(--radius);padding:30px 24px;transition:.32s;
}
.step:hover{transform:translateY(-6px);border-color:rgba(124,92,255,.45)}
.step-num{
  font-size:40px;font-weight:800;line-height:1;
  background:var(--grad);-webkit-background-clip:text;background-clip:text;
  -webkit-text-fill-color:transparent;opacity:.85;
}
.step h3{font-size:18px;margin:14px 0 8px}
.step p{font-size:13.5px;color:var(--muted)}
.step ul{list-style:none;margin-top:14px}
.step li{
  font-size:13px;color:#c3bfdd;padding:5px 0 5px 18px;position:relative;
}
.step li::before{
  content:"";position:absolute;left:0;top:12px;width:6px;height:6px;border-radius:50%;
  background:var(--grad);
}

/* ---------- 关于 / CTA ---------- */
.cta-box{
  display:grid;grid-template-columns:1.4fr .8fr;gap:40px;align-items:center;
  border:1px solid var(--line);border-radius:24px;padding:50px;
  background:linear-gradient(135deg,rgba(124,92,255,.12),rgba(0,212,255,.06) 55%,rgba(255,78,205,.1));
  backdrop-filter:blur(10px);
}
.cta-box h2{font-size:clamp(24px,3vw,34px);font-weight:800;margin-bottom:16px}
.cta-box p{font-size:15px;color:#cdc9e2;margin-bottom:12px}
.cta-box p b{color:#fff}
.cta-box .muted{font-size:13.5px;color:var(--muted)}
.cta-box .btn{margin-top:14px}
.qr{text-align:center}
.qr-frame{
  border:1px solid rgba(255,255,255,.18);border-radius:16px;padding:10px;
  background:#fff;display:inline-block;
  box-shadow:0 0 34px rgba(124,92,255,.25);
}
.qr-frame img{display:block;width:150px;height:150px;border-radius:10px}
.qr span{display:block;font-size:12.5px;color:var(--muted);margin-top:12px}

/* ---------- 页脚 ---------- */
.foot{border-top:1px solid var(--line);padding:50px 0 40px;text-align:center}
.foot-brand{font-size:17px;font-weight:600;display:inline-flex;align-items:center;gap:9px}
.foot-brand b{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.foot-brand .logo-mark{width:28px;height:28px;font-size:14px;border-radius:8px}
.foot p{color:var(--muted);font-size:13.5px;margin-top:8px}
.foot-links{display:flex;gap:22px;justify-content:center;margin:18px 0 22px;font-size:13.5px;color:var(--muted)}
.foot-links a:hover{color:var(--txt)}
.foot small{color:#6d6a85;font-size:12px}

/* ---------- 入场动画 ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:960px){
  .cat-grid{grid-template-columns:repeat(2,1fr)}
  .tut-grid{grid-template-columns:repeat(2,1fr)}
  .path-grid{grid-template-columns:repeat(2,1fr)}
  .stats-grid{grid-template-columns:repeat(2,1fr);gap:26px}
  .cta-box{grid-template-columns:1fr;padding:34px}
  .qr{margin:0 auto}
}
@media (max-width:620px){
  .menu{
    position:fixed;top:0;right:-260px;width:240px;height:100vh;
    background:rgba(11,11,22,.97);backdrop-filter:blur(20px);
    flex-direction:column;padding:90px 30px;gap:22px;transition:.35s;
    border-left:1px solid var(--line);
  }
  .menu.open{right:0}
  .burger{display:flex}
  .nav-cta{display:none}
  .cat-grid,.tut-grid,.path-grid{grid-template-columns:1fr}
  .hero{padding-top:110px}
}

/* ==========================================================================
   教程列表页
   ========================================================================== */
.list-head{padding:132px 0 0}
.list-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-top:30px}
.empty-tip{color:var(--muted);font-size:14.5px;padding:40px 0;text-align:center;display:none}
.empty-tip.show{display:block}

/* ==========================================================================
   文章页
   ========================================================================== */
.wrap-narrow{max-width:800px;margin:0 auto;padding:0 24px}

.breadcrumb{display:flex;flex-wrap:wrap;gap:8px;align-items:center;font-size:13px;color:var(--muted);padding-top:124px}
.breadcrumb a{transition:.2s}
.breadcrumb a:hover{color:var(--txt)}

.post-head{padding:24px 0 0}
.post-meta{display:flex;align-items:center;gap:12px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}
.post-meta .dot{width:3px;height:3px;border-radius:50%;background:var(--muted)}
.post-head h1{font-size:clamp(26px,4.6vw,40px);line-height:1.3;font-weight:800;margin:18px 0 0;letter-spacing:-.6px}
.post-lead{
  font-size:16px;line-height:1.9;color:#b9b5cf;margin-top:18px;
  padding:2px 0 2px 18px;border-left:3px solid var(--violet);
}

.post-body{margin-top:40px;font-size:16px;line-height:1.95;color:#d5d2e6}
.post-body h2{
  font-size:22px;font-weight:700;color:#fff;margin:46px 0 16px;
  padding-left:14px;border-left:3px solid var(--violet);line-height:1.45;
}
.post-body h2:first-child{margin-top:0}
.post-body h3{font-size:17.5px;font-weight:700;color:#fff;margin:30px 0 12px}
.post-body p{margin:16px 0}
.post-body strong{color:#fff;font-weight:600}
.post-body a{color:var(--cyan);border-bottom:1px dashed rgba(0,212,255,.45)}
.post-body ul,.post-body ol{margin:16px 0;padding-left:24px}
.post-body li{margin:9px 0}
.post-body ul li::marker{color:var(--violet)}
.post-body ol li::marker{color:var(--violet);font-weight:600}
.post-body code{
  background:rgba(124,92,255,.16);color:#c9b8ff;padding:2px 7px;border-radius:6px;
  font-size:14.5px;font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}
.post-body blockquote{
  margin:22px 0;padding:16px 20px;background:rgba(255,255,255,.035);
  border-left:3px solid var(--cyan);border-radius:0 10px 10px 0;
  color:#c7c3dd;font-size:15px;
}
.post-body blockquote p{margin:6px 0}
.post-body table{width:100%;border-collapse:collapse;margin:22px 0;font-size:14.5px;display:block;overflow-x:auto}
.post-body th{
  background:rgba(124,92,255,.14);color:#fff;font-weight:600;
  text-align:left;padding:11px 14px;border:1px solid var(--line);white-space:nowrap;
}
.post-body td{padding:11px 14px;border:1px solid var(--line);color:#c9c5e0}
.post-body hr{border:0;border-top:1px solid var(--line);margin:36px 0}

.prompt-card{
  margin:22px 0;border:1px solid rgba(0,212,255,.3);border-radius:14px;
  overflow:hidden;background:rgba(0,212,255,.05);
}
.prompt-head{
  padding:9px 16px;background:rgba(0,212,255,.12);font-size:13px;font-weight:600;
  color:#7fe6ff;display:flex;justify-content:space-between;align-items:center;gap:10px;
}
.prompt-head span{color:#5d90a5;font-weight:400;font-size:12px}
.prompt-card pre{
  margin:0;padding:16px 18px;font-size:14px;line-height:1.85;color:#d9e9f5;
  white-space:pre-wrap;word-break:break-word;
  font-family:ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

.tip{
  margin:22px 0;border:1px solid rgba(255,159,39,.35);border-radius:14px;
  background:rgba(255,159,39,.07);padding:16px 20px;
}
.tip > b{display:block;color:#ffc069;font-size:14px;margin-bottom:8px}
.tip p{margin:8px 0;font-size:15px;color:#d8cbb8}
.tip ul{margin:8px 0;padding-left:22px}
.tip li{font-size:15px;color:#d8cbb8}

.key-points{
  margin:22px 0;border:1px solid rgba(124,92,255,.35);border-radius:14px;
  background:rgba(124,92,255,.08);padding:18px 22px;
}
.key-points > b{display:block;color:#b7a4ff;font-size:14px;margin-bottom:10px}
.key-points ul{margin:0;padding-left:22px}
.key-points li{font-size:15px;color:#cfc9e8;margin:7px 0}

.steps{margin:24px 0;display:flex;flex-direction:column;gap:14px}
.step-item{
  display:flex;gap:15px;background:rgba(255,255,255,.03);
  border:1px solid var(--line);border-radius:14px;padding:16px 18px;transition:.25s;
}
.step-item:hover{border-color:rgba(124,92,255,.38)}
.step-no{
  flex:0 0 30px;height:30px;border-radius:50%;background:var(--grad);color:#fff;
  display:grid;place-items:center;font-size:13.5px;font-weight:700;
}
.step-item h3{margin:0 0 6px;font-size:15.5px;color:#fff}
.step-item p{margin:0;font-size:14.5px;color:#b9b5cf;line-height:1.8}

.post-toc{
  margin:34px 0 0;border:1px solid var(--line);border-radius:14px;
  background:rgba(255,255,255,.028);padding:18px 22px;
}
.post-toc b{display:block;font-size:13px;color:var(--muted);letter-spacing:1px;margin-bottom:10px}
.post-toc ol{margin:0;padding-left:20px}
.post-toc li{font-size:14px;margin:6px 0}
.post-toc a{color:#c6c2de;transition:.2s}
.post-toc a:hover{color:var(--cyan)}

.post-foot{margin:64px 0 0;padding-top:32px;border-top:1px solid var(--line)}
.next-prev{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:32px}
.next-prev a{
  padding:16px 18px;border:1px solid var(--line);border-radius:14px;
  background:rgba(255,255,255,.03);transition:.25s;font-size:14px;color:#d3cfe8;
}
.next-prev a:hover{border-color:rgba(124,92,255,.5);transform:translateY(-3px)}
.next-prev small{display:block;color:var(--muted);font-size:12px;margin-bottom:6px}
.next-prev .np-right{text-align:right}

.post-cta{
  border:1px solid var(--line);border-radius:16px;padding:26px;
  background:linear-gradient(135deg,rgba(124,92,255,.14),rgba(0,212,255,.07));
  text-align:center;
}
.post-cta p{color:#cdc9e2;font-size:14px;margin:0 0 8px}
.post-cta b{color:#fff}
.post-cta .cta-qr{
  display:block;width:120px;height:120px;margin:0 auto 16px;
  border-radius:10px;background:#fff;padding:6px;
  box-shadow:0 0 26px rgba(124,92,255,.28);
}

@media (max-width:820px){
  .list-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:620px){
  .list-grid{grid-template-columns:1fr}
  .next-prev{grid-template-columns:1fr}
  .next-prev .np-right{text-align:left}
  .post-body{font-size:15.5px}
  .breadcrumb{padding-top:106px}
}