/* ============================================================
   趣玩游戏库 GameBox — category.css
   游戏分类页 · 分类卡片 + 分类内游戏 · 深色科技风 · 响应式
   ============================================================ */

:root{
  --bg:#0f1115; --bg-2:#0b0d11; --card:#181c24; --card-2:#1d2330;
  --line:rgba(255,255,255,.08); --line-strong:rgba(255,255,255,.14);
  --txt:#e6e9f0; --txt-2:#9aa3b2; --txt-3:#6b7384;
  --blue:#4f8cff; --purple:#a855f7;
  --grad:linear-gradient(135deg,#4f8cff 0%,#7c5cff 50%,#a855f7 100%);
  --radius:18px; --radius-sm:12px;
  --shadow:0 10px 30px rgba(0,0,0,.45); --shadow-lg:0 24px 60px rgba(0,0,0,.55);
  --blur:saturate(160%) blur(14px); --ease:cubic-bezier(.22,.61,.36,1);
  --maxw:1240px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Microsoft YaHei","PingFang SC","Segoe UI",system-ui,sans-serif;background:var(--bg);color:var(--txt);line-height:1.6;overflow-x:hidden;min-height:100vh}
a{color:inherit;text-decoration:none} ul{list-style:none} img{display:block;max-width:100%}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
.container{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 24px}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 22px;border-radius:30px;font-size:15px;font-weight:600;transition:transform .25s var(--ease),box-shadow .25s;white-space:nowrap;user-select:none}
.btn:active{transform:translateY(1px) scale(.98)}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 8px 24px rgba(79,140,255,.35)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 14px 34px rgba(79,140,255,.5)}
.btn-ghost{background:rgba(255,255,255,.06);color:var(--txt);border:1px solid var(--line-strong);backdrop-filter:var(--blur)}
.btn-ghost:hover{background:rgba(255,255,255,.12);transform:translateY(-2px)}
.btn-lg{padding:14px 34px;font-size:16px}
.btn-login{padding:9px 22px;background:rgba(255,255,255,.06);border:1px solid var(--line-strong);color:var(--txt)}
.btn-login:hover{background:var(--grad);border-color:transparent}

/* Navbar (shared) */
.navbar{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(15,17,21,.65);backdrop-filter:var(--blur);border-bottom:1px solid transparent;transition:background .3s,border-color .3s,box-shadow .3s}
.navbar.scrolled{background:rgba(11,13,17,.9);border-color:var(--line);box-shadow:0 6px 24px rgba(0,0,0,.4)}
.nav-inner{display:flex;align-items:center;height:68px;gap:24px}
.logo{display:flex;align-items:center;gap:9px;font-size:20px;font-weight:800;flex-shrink:0}
.logo-icon{font-size:22px;filter:drop-shadow(0 0 8px rgba(79,140,255,.6))}
.logo-text{color:#fff}
.logo-accent{background:var(--grad);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.nav-menu{flex:1;display:flex;justify-content:center}
.nav-menu ul{display:flex;gap:6px}
.nav-link{position:relative;display:block;padding:9px 16px;border-radius:10px;color:var(--txt-2);font-size:15px;font-weight:500;transition:color .25s,background .25s}
.nav-link:hover{color:var(--txt);background:rgba(255,255,255,.05)}
.nav-link.active{color:#fff}
.nav-link.active::after{content:"";position:absolute;left:16px;right:16px;bottom:3px;height:2px;border-radius:2px;background:var(--grad)}
.nav-actions{display:flex;align-items:center;gap:14px;flex-shrink:0}
.search-box{display:flex;align-items:center;gap:6px;background:rgba(255,255,255,.06);border:1px solid var(--line);border-radius:30px;padding:5px 6px 5px 16px;transition:.25s}
.search-box:focus-within{border-color:var(--blue);background:rgba(79,140,255,.08)}
.search-box input{background:none;border:none;outline:none;color:var(--txt);width:170px;font-size:14px}
.search-box input::placeholder{color:var(--txt-3)}
.search-btn{display:grid;place-items:center;width:32px;height:32px;border-radius:50%;color:var(--txt-2);transition:.2s}
.search-btn:hover{background:var(--grad);color:#fff}
.nav-toggle{display:none;flex-direction:column;gap:5px;padding:8px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--txt);border-radius:2px;transition:.3s}
.nav-toggle.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.open span:nth-child(2){opacity:0}
.nav-toggle.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Page head */
.page-head{padding:100px 0 30px;background:linear-gradient(180deg,var(--bg-2) 0%,var(--bg) 100%);border-bottom:1px solid var(--line)}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--txt-3);margin-bottom:16px}
.breadcrumb a{color:var(--txt-2);transition:.2s} .breadcrumb a:hover{color:var(--blue)}
.breadcrumb .sep{opacity:.6} .breadcrumb .cur{color:var(--txt);font-weight:600}
.page-title{font-size:34px;font-weight:900;letter-spacing:1px;margin-bottom:8px;background:linear-gradient(120deg,#fff 30%,#9cc0ff 80%);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.page-desc{color:var(--txt-2);font-size:15px;max-width:600px}

/* Main */
.main-content{padding-top:34px;padding-bottom:60px}
.section-title{font-size:26px;font-weight:800;position:relative;padding-left:16px;display:inline-block}
.section-title::before{content:"";position:absolute;left:0;top:5px;bottom:5px;width:5px;border-radius:3px;background:var(--grad)}
.section-sub{color:var(--txt-3);font-size:14px;margin-top:6px;padding-left:16px}

/* Category grid */
.cat-overview{margin-bottom:50px}
.cat-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:24px}
.cat-card{
  position:relative;display:flex;flex-direction:column;align-items:center;gap:14px;padding:28px 20px;
  background:var(--card);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;
  cursor:pointer;transition:transform .35s var(--ease),border-color .35s,box-shadow .35s;
  animation:fadeup .5s var(--ease) both;
}
.cat-card::before{content:"";position:absolute;inset:0;opacity:0;transition:opacity .35s;background:radial-gradient(circle at 50% 0%,rgba(79,140,255,.18),transparent 60%)}
.cat-card:hover{transform:translateY(-8px);border-color:rgba(79,140,255,.45);box-shadow:var(--shadow-lg)}
.cat-card:hover::before{opacity:1}
.cat-card.active{border-color:var(--blue);background:var(--card-2)}
.cat-card.active::before{opacity:1}
.cat-ico{width:72px;height:72px;border-radius:18px;transition:transform .35s var(--ease)}
.cat-card:hover .cat-ico{transform:scale(1.1) rotate(-5deg)}
.cat-name{font-size:17px;font-weight:700}
.cat-count{font-size:13px;color:var(--txt-3)}
.cat-count b{color:var(--blue);font-weight:800}

/* Category detail */
.cat-detail{margin-top:10px;animation:fadeup .5s var(--ease) both}
.cat-detail-head{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;margin-bottom:24px}
.cat-game-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cg-card{
  position:relative;background:var(--card);border:1px solid var(--line);border-radius:var(--radius);
  overflow:hidden;cursor:pointer;transition:transform .35s var(--ease),box-shadow .35s,border-color .35s;
  animation:fadeup .4s var(--ease) both;
}
.cg-card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:rgba(79,140,255,.45)}
.cg-cover{position:relative;aspect-ratio:3/4;overflow:hidden;background:#0b0d11}
.cg-cover img{width:100%;height:100%;object-fit:cover;transition:transform .5s var(--ease)}
.cg-card:hover .cg-cover img{transform:scale(1.1)}
.cg-cover::after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,transparent 55%,rgba(0,0,0,.7) 100%)}
.cg-score{position:absolute;top:10px;right:10px;z-index:2;padding:4px 10px;border-radius:20px;font-size:12px;font-weight:800;color:#ffd66b;background:rgba(0,0,0,.6);backdrop-filter:blur(6px)}
.cg-body{padding:14px 16px}
.cg-name{font-size:15px;font-weight:700;margin-bottom:8px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.cg-meta{display:flex;justify-content:space-between;font-size:12px;color:var(--txt-3)}
.cg-meta b{color:var(--txt-2);font-weight:600}

.cat-detail-more{text-align:center;margin-top:28px}

/* Footer */
.footer{background:var(--bg-2);border-top:1px solid var(--line);padding-top:54px}
.footer-inner{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:36px;padding-bottom:36px}
.footer-brand .logo{margin-bottom:14px}
.footer-desc{color:var(--txt-3);font-size:13px;max-width:280px}
.footer-col h4{font-size:15px;font-weight:700;margin-bottom:16px;color:#fff}
.footer-col ul{display:grid;gap:10px}
.footer-col a{color:var(--txt-3);font-size:13px;transition:.2s} .footer-col a:hover{color:var(--blue)}
.footer-bottom{border-top:1px solid var(--line);padding:20px 0;text-align:center}
.footer-bottom p{font-size:12px;color:var(--txt-3)}

/* Toast */
.toast{position:fixed;left:50%;bottom:34px;transform:translateX(-50%) translateY(20px);padding:12px 26px;border-radius:30px;font-size:14px;font-weight:600;color:#fff;background:rgba(24,28,36,.95);border:1px solid var(--line-strong);box-shadow:var(--shadow);backdrop-filter:blur(10px);opacity:0;pointer-events:none;transition:.35s var(--ease);z-index:400}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* Back top */
.back-top{position:fixed;right:26px;bottom:26px;width:46px;height:46px;border-radius:50%;background:var(--grad);color:#fff;font-size:20px;font-weight:700;box-shadow:0 10px 26px rgba(79,140,255,.4);opacity:0;pointer-events:none;transition:.3s var(--ease);z-index:90;display:grid;place-items:center}
.back-top.show{opacity:1;pointer-events:auto} .back-top:hover{transform:translateY(-4px)}

@keyframes fadeup{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:none}}

/* Responsive */
@media (max-width:1080px){.cat-grid{grid-template-columns:repeat(3,1fr)} .cat-game-grid{grid-template-columns:repeat(3,1fr)} .search-box input{width:130px}}
@media (max-width:900px){
  .nav-toggle{display:flex}
  .nav-menu{position:fixed;top:68px;left:0;right:0;flex-direction:column;background:rgba(11,13,17,.97);backdrop-filter:blur(16px);border-bottom:1px solid var(--line);padding:14px 24px 22px;transform:translateY(-130%);transition:transform .35s var(--ease);max-height:calc(100vh - 68px);overflow:auto}
  .nav-menu.open{transform:translateY(0)} .nav-menu ul{flex-direction:column;gap:4px}
  .nav-link{padding:13px 16px;font-size:16px} .nav-link.active::after{display:none} .nav-link.active{background:rgba(79,140,255,.15)}
  .nav-actions{margin-left:auto}
  .cat-grid{grid-template-columns:repeat(3,1fr)}
  .cat-game-grid{grid-template-columns:repeat(3,1fr)}
}
@media (max-width:768px){
  .container{padding:0 16px} .page-head{padding:90px 0 20px} .page-title{font-size:26px}
  .cat-grid{grid-template-columns:repeat(2,1fr)} .cat-game-grid{grid-template-columns:repeat(2,1fr)}
  .footer-inner{grid-template-columns:1fr 1fr;gap:24px}
}
@media (max-width:480px){
  .cat-grid{grid-template-columns:1fr} .cat-game-grid{grid-template-columns:1fr}
  .footer-inner{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}