/* hl51-d8e2 — idzrvh.cn — dark neon cyberpunk theme */
:root{
  --hl51-d8e2-bg:#0a0820;
  --hl51-d8e2-bg2:#120a32;
  --hl51-d8e2-fg:#eaf2ff;
  --hl51-d8e2-mute:#9aa3c4;
  --hl51-d8e2-cyan:#22f0d4;
  --hl51-d8e2-magenta:#ff52a8;
  --hl51-d8e2-violet:#7a55ff;
  --hl51-d8e2-glass:rgba(255,255,255,.06);
  --hl51-d8e2-stroke:rgba(255,255,255,.12);
}
*{box-sizing:border-box;margin:0;padding:0}
html,body{background:var(--hl51-d8e2-bg);color:var(--hl51-d8e2-fg);font-family:-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;line-height:1.6;-webkit-font-smoothing:antialiased;scroll-behavior:smooth}
body{background:radial-gradient(1100px 600px at 90% -10%,rgba(122,85,255,.35),transparent 60%),radial-gradient(800px 500px at -10% 20%,rgba(34,240,212,.22),transparent 60%),var(--hl51-d8e2-bg)}
a{color:inherit;text-decoration:none;transition:.25s}
img{max-width:100%;display:block;border-radius:14px}

/* Nav */
.hl51-d8e2-nav{position:sticky;top:0;z-index:50;backdrop-filter:blur(18px);-webkit-backdrop-filter:blur(18px);background:rgba(10,8,32,.55);border-bottom:1px solid var(--hl51-d8e2-stroke)}
.hl51-d8e2-nav-inner{max-width:1240px;margin:0 auto;padding:14px 20px;display:flex;align-items:center;gap:24px}
.hl51-d8e2-brand{display:flex;align-items:center;gap:10px;font-weight:800;letter-spacing:.5px;font-size:18px}
.hl51-d8e2-brand h1{font-size:18px;background:linear-gradient(90deg,var(--hl51-d8e2-cyan),var(--hl51-d8e2-magenta));-webkit-background-clip:text;background-clip:text;color:transparent;font-weight:900}
.hl51-d8e2-menu{display:flex;gap:8px;flex-wrap:wrap;flex:1}
.hl51-d8e2-menu a{padding:8px 14px;border-radius:999px;font-size:14px;color:var(--hl51-d8e2-mute);border:1px solid transparent}
.hl51-d8e2-menu a:hover,.hl51-d8e2-menu a.is-active{color:#fff;border-color:var(--hl51-d8e2-stroke);background:var(--hl51-d8e2-glass)}
.hl51-d8e2-search{position:relative;display:flex;align-items:center}
.hl51-d8e2-search input{background:var(--hl51-d8e2-glass);border:1px solid var(--hl51-d8e2-stroke);color:#fff;padding:9px 14px 9px 36px;border-radius:999px;outline:none;width:200px;transition:.3s}
.hl51-d8e2-search input:focus{width:280px;border-color:var(--hl51-d8e2-cyan);box-shadow:0 0 0 3px rgba(34,240,212,.2)}
.hl51-d8e2-search svg{position:absolute;left:12px;width:16px;height:16px;opacity:.7}

/* hero */
.hl51-d8e2-hero{max-width:1240px;margin:30px auto;padding:0 20px;display:grid;grid-template-columns:1.2fr .9fr;gap:30px;align-items:center}
.hl51-d8e2-hero-card{background:linear-gradient(135deg,rgba(122,85,255,.18),rgba(34,240,212,.10));border:1px solid var(--hl51-d8e2-stroke);border-radius:24px;padding:36px;backdrop-filter:blur(14px)}
.hl51-d8e2-tag{display:inline-block;padding:5px 12px;border-radius:999px;background:rgba(34,240,212,.12);color:var(--hl51-d8e2-cyan);font-size:12px;letter-spacing:1px;border:1px solid rgba(34,240,212,.3)}
.hl51-d8e2-hero h2{font-size:40px;margin:14px 0;line-height:1.2;font-weight:900}
.hl51-d8e2-hero h2 span{background:linear-gradient(90deg,#fff,var(--hl51-d8e2-magenta));-webkit-background-clip:text;background-clip:text;color:transparent}
.hl51-d8e2-hero p{color:var(--hl51-d8e2-mute);margin-bottom:22px}
.hl51-d8e2-cta{display:inline-flex;align-items:center;gap:8px;padding:13px 24px;border-radius:999px;background:linear-gradient(90deg,var(--hl51-d8e2-cyan),var(--hl51-d8e2-magenta));color:#0b0820;font-weight:800;box-shadow:0 14px 40px -12px rgba(34,240,212,.45)}
.hl51-d8e2-cta:hover{transform:translateY(-2px)}
.hl51-d8e2-hero-img{position:relative;border-radius:24px;overflow:hidden;border:1px solid var(--hl51-d8e2-stroke);box-shadow:0 30px 80px -30px rgba(0,0,0,.6)}

/* breadcrumb */
.hl51-d8e2-crumb{max-width:1240px;margin:0 auto;padding:0 20px 6px;font-size:13px;color:var(--hl51-d8e2-mute)}
.hl51-d8e2-crumb a:hover{color:var(--hl51-d8e2-cyan)}

/* sections */
.hl51-d8e2-section{max-width:1240px;margin:50px auto;padding:0 20px}
.hl51-d8e2-section-head{display:flex;align-items:end;justify-content:space-between;margin-bottom:24px;flex-wrap:wrap;gap:12px}
.hl51-d8e2-section-head h3{font-size:26px;font-weight:900}
.hl51-d8e2-section-head h3::before{content:"";display:inline-block;width:4px;height:22px;background:linear-gradient(var(--hl51-d8e2-cyan),var(--hl51-d8e2-magenta));margin-right:10px;vertical-align:-3px;border-radius:2px}
.hl51-d8e2-section-head p{color:var(--hl51-d8e2-mute);font-size:14px}

/* video card grid (asymmetric) */
.hl51-d8e2-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.hl51-d8e2-vcard{position:relative;border-radius:18px;overflow:hidden;background:var(--hl51-d8e2-glass);border:1px solid var(--hl51-d8e2-stroke);transition:.4s;cursor:pointer}
.hl51-d8e2-vcard:hover{transform:translateY(-6px);border-color:var(--hl51-d8e2-cyan);box-shadow:0 24px 60px -24px rgba(34,240,212,.4)}
.hl51-d8e2-vcard .thumb{aspect-ratio:3/4;overflow:hidden;position:relative}
.hl51-d8e2-vcard .thumb img{width:100%;height:100%;object-fit:cover;border-radius:0;transition:.6s}
.hl51-d8e2-vcard:hover .thumb img{transform:scale(1.08)}
.hl51-d8e2-vcard .mask{position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,0,0,0) 40%,rgba(10,8,32,.85));opacity:0;transition:.3s;display:flex;align-items:center;justify-content:center}
.hl51-d8e2-vcard:hover .mask{opacity:1}
.hl51-d8e2-play{width:64px;height:64px;border-radius:50%;background:rgba(255,255,255,.15);backdrop-filter:blur(8px);border:2px solid #fff;display:flex;align-items:center;justify-content:center}
.hl51-d8e2-play::before{content:"";border:10px solid transparent;border-left:16px solid #fff;margin-left:5px}
.hl51-d8e2-vcard .meta{padding:14px 16px}
.hl51-d8e2-vcard .meta h4{font-size:16px;font-weight:800;margin-bottom:6px}
.hl51-d8e2-vcard .meta p{font-size:12px;color:var(--hl51-d8e2-mute)}
.hl51-d8e2-vcard .badge{position:absolute;top:10px;left:10px;padding:4px 10px;background:rgba(255,82,168,.9);color:#fff;font-size:11px;border-radius:6px;font-weight:700}
.hl51-d8e2-vcard .dur{position:absolute;bottom:10px;right:10px;padding:3px 8px;background:rgba(0,0,0,.7);color:#fff;font-size:11px;border-radius:4px}

/* tutorials/category */
.hl51-d8e2-cats{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}
.hl51-d8e2-cat{padding:20px;background:var(--hl51-d8e2-glass);border:1px solid var(--hl51-d8e2-stroke);border-radius:14px;transition:.3s;cursor:pointer}
.hl51-d8e2-cat:hover{transform:translateY(-4px);border-color:var(--hl51-d8e2-magenta)}
.hl51-d8e2-cat .ico{width:42px;height:42px;border-radius:12px;background:linear-gradient(135deg,var(--hl51-d8e2-cyan),var(--hl51-d8e2-violet));display:flex;align-items:center;justify-content:center;margin-bottom:12px;font-size:20px}
.hl51-d8e2-cat h4{font-size:15px;margin-bottom:4px}
.hl51-d8e2-cat p{font-size:12px;color:var(--hl51-d8e2-mute)}

/* reviews */
.hl51-d8e2-reviews{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.hl51-d8e2-rev{padding:18px;border-radius:16px;background:var(--hl51-d8e2-glass);border:1px solid var(--hl51-d8e2-stroke)}
.hl51-d8e2-rev .top{display:flex;align-items:center;gap:10px;margin-bottom:10px}
.hl51-d8e2-rev .av{width:38px;height:38px;border-radius:50%;background:linear-gradient(135deg,var(--hl51-d8e2-cyan),var(--hl51-d8e2-magenta));display:flex;align-items:center;justify-content:center;font-weight:800;color:#0b0820}
.hl51-d8e2-rev .name{font-weight:700;font-size:14px}
.hl51-d8e2-rev .stars{color:#ffd54a;font-size:12px}
.hl51-d8e2-rev p{font-size:13px;color:var(--hl51-d8e2-mute);line-height:1.6}

/* contact */
.hl51-d8e2-contact{display:grid;grid-template-columns:1.1fr .9fr;gap:30px;background:linear-gradient(135deg,rgba(122,85,255,.15),rgba(34,240,212,.08));border:1px solid var(--hl51-d8e2-stroke);border-radius:24px;padding:30px}
.hl51-d8e2-contact h4{font-size:20px;margin-bottom:14px;font-weight:900}
.hl51-d8e2-contact ul{list-style:none;display:flex;flex-direction:column;gap:10px;color:var(--hl51-d8e2-mute);font-size:14px}
.hl51-d8e2-contact ul strong{color:#fff;margin-right:6px}
.hl51-d8e2-share{display:flex;gap:10px;margin-top:18px;flex-wrap:wrap}
.hl51-d8e2-share a{width:42px;height:42px;border-radius:12px;background:var(--hl51-d8e2-glass);border:1px solid var(--hl51-d8e2-stroke);display:flex;align-items:center;justify-content:center;font-size:18px}
.hl51-d8e2-share a:hover{border-color:var(--hl51-d8e2-cyan);transform:translateY(-2px)}
.hl51-d8e2-qrwrap{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.hl51-d8e2-qr{padding:14px;background:var(--hl51-d8e2-glass);border:1px solid var(--hl51-d8e2-stroke);border-radius:14px;text-align:center;font-size:12px;color:var(--hl51-d8e2-mute)}
.hl51-d8e2-qr .box{aspect-ratio:1;background:repeating-conic-gradient(#fff 0 25%,#0a0820 0 50%) 0 0/14px 14px;border-radius:8px;margin-bottom:8px}

/* faq */
.hl51-d8e2-faq{display:grid;gap:10px;max-width:900px;margin:0 auto}
.hl51-d8e2-faq details{background:var(--hl51-d8e2-glass);border:1px solid var(--hl51-d8e2-stroke);border-radius:14px;padding:14px 18px;transition:.3s}
.hl51-d8e2-faq details[open]{border-color:var(--hl51-d8e2-cyan);background:rgba(34,240,212,.06)}
.hl51-d8e2-faq summary{font-weight:700;cursor:pointer;list-style:none;display:flex;justify-content:space-between;align-items:center}
.hl51-d8e2-faq summary::after{content:"+";font-size:20px;color:var(--hl51-d8e2-cyan);transition:.3s}
.hl51-d8e2-faq details[open] summary::after{transform:rotate(45deg)}
.hl51-d8e2-faq p{margin-top:10px;color:var(--hl51-d8e2-mute);font-size:14px;animation:hl51fadein .4s}
@keyframes hl51fadein{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}

/* footer */
.hl51-d8e2-foot{margin-top:60px;border-top:1px solid var(--hl51-d8e2-stroke);background:rgba(0,0,0,.3)}
.hl51-d8e2-foot-inner{max-width:1240px;margin:0 auto;padding:34px 20px;display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:24px}
.hl51-d8e2-foot h5{font-size:15px;margin-bottom:12px;font-weight:800}
.hl51-d8e2-foot ul{list-style:none;display:flex;flex-direction:column;gap:8px;font-size:13px;color:var(--hl51-d8e2-mute)}
.hl51-d8e2-foot a:hover{color:var(--hl51-d8e2-cyan)}
.hl51-d8e2-copy{text-align:center;padding:18px;color:var(--hl51-d8e2-mute);font-size:12px;border-top:1px solid var(--hl51-d8e2-stroke)}

/* mobile */
@media (max-width:880px){
  .hl51-d8e2-hero{grid-template-columns:1fr}
  .hl51-d8e2-hero h2{font-size:30px}
  .hl51-d8e2-grid,.hl51-d8e2-cats,.hl51-d8e2-reviews{grid-template-columns:repeat(2,1fr)}
  .hl51-d8e2-contact{grid-template-columns:1fr}
  .hl51-d8e2-foot-inner{grid-template-columns:1fr 1fr}
  .hl51-d8e2-search input{width:140px}
  .hl51-d8e2-search input:focus{width:180px}
  .hl51-d8e2-menu{gap:4px}
  .hl51-d8e2-menu a{padding:6px 10px;font-size:13px}
}
@media (max-width:520px){
  .hl51-d8e2-grid,.hl51-d8e2-cats,.hl51-d8e2-reviews{grid-template-columns:1fr 1fr}
  .hl51-d8e2-foot-inner{grid-template-columns:1fr}
}