:root{
    --blue:#0d6efd;
    --blue-dark:#0a58ca;
    --navy:#0b2545;
    --ink:#16233a;
    --muted:#5b6573;
    --line:#e6ebf2;
    --bg-soft:#f6f9fe;
    --shadow-sm:0 1px 2px rgba(11,37,69,.06), 0 4px 14px rgba(11,37,69,.05);
    --shadow-md:0 10px 26px rgba(11,37,69,.10);
    --shadow-lg:0 24px 50px rgba(11,37,69,.14);
  }
  *{box-sizing:border-box;margin:0;padding:0;}
  html{scroll-behavior:smooth;}
  body{font-family:'Nunito','Nunito Fallback',system-ui,sans-serif;color:var(--ink);background:#fff;-webkit-font-smoothing:antialiased;line-height:1.55;}
  a{color:inherit;text-decoration:none;}
  img{max-width:100%;}
  .wrap{max-width:1180px;margin:0 auto;padding:0 24px;}

  /* ---------- Header ---------- */
  header{position:sticky;top:0;z-index:60;background:rgba(255,255,255,.85);backdrop-filter:blur(12px);border-bottom:1px solid var(--line);transition:box-shadow .25s,background .25s;}
  header::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,var(--blue) 0%,#16a36a 50%,#e8833a 100%);}
  header.scrolled{box-shadow:0 6px 24px rgba(11,37,69,.10);background:rgba(255,255,255,.95);}
  .nav{display:flex;align-items:center;justify-content:space-between;height:72px;}
  .brand{display:flex;align-items:center;}
  .brand img{height:30px;width:auto;display:block;}
  nav.links{display:flex;align-items:center;gap:2px;}
  nav.links a{position:relative;color:#2b3a52;font-weight:700;font-size:15px;padding:10px 15px;border-radius:9px;white-space:nowrap;transition:background .18s,color .18s,transform .18s;}
  nav.links a:not(.cta)::after{content:"";position:absolute;left:15px;right:15px;bottom:8px;height:2px;background:var(--blue);border-radius:2px;transform:scaleX(0);transform-origin:left;transition:transform .2s;}
  nav.links a:not(.cta):hover{color:var(--blue);}
  nav.links a:not(.cta):hover::after{transform:scaleX(1);}
  .nav-sep{width:1px;height:22px;background:var(--line);margin:0 10px;}
  nav.links a.cta{display:inline-flex;align-items:center;gap:7px;background:var(--blue);color:#fff;box-shadow:0 6px 16px rgba(13,110,253,.28);}
  nav.links a.cta:hover{background:var(--blue-dark);color:#fff;transform:translateY(-1px);}
  nav.links a.cta svg{width:15px;height:15px;}
  .burger{display:none;background:none;border:0;width:44px;height:44px;border-radius:10px;cursor:pointer;align-items:center;justify-content:center;color:var(--navy);}
  .burger:hover{background:var(--bg-soft);}
  .burger svg{width:26px;height:26px;}
  .mobile-menu{display:none;}
  #categories{scroll-margin-top:90px;}

  /* ---------- Hero ---------- */
  .hero{background:linear-gradient(180deg,#fff 0%,var(--bg-soft) 100%);padding:64px 0 76px;border-bottom:1px solid var(--line);}
  .hero .wrap{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center;}
  .eyebrow{display:inline-flex;align-items:center;gap:8px;background:#e7f0ff;color:var(--blue-dark);font-weight:800;font-size:13px;letter-spacing:.04em;text-transform:uppercase;padding:7px 14px;border-radius:999px;margin-bottom:22px;}
  .eyebrow .dot{width:7px;height:7px;border-radius:50%;background:var(--blue);}
  .hero h1{font-size:clamp(34px,5.2vw,50px);font-weight:900;letter-spacing:-.025em;line-height:1.06;color:var(--navy);margin-bottom:16px;text-wrap:balance;}
  .hero p.sub{font-size:clamp(16px,2vw,18px);color:var(--muted);max-width:480px;margin-bottom:30px;}
  .searchbar{display:flex;background:#fff;border:1px solid var(--line);border-radius:13px;box-shadow:var(--shadow-md);overflow:hidden;max-width:520px;}
  .searchbar .ic{display:flex;align-items:center;padding-left:18px;color:#6a727d;}
  .searchbar input{flex:1;min-width:0;border:0;outline:0;font-family:inherit;font-size:16px;font-weight:600;padding:16px 14px;color:var(--ink);background:transparent;}
  .searchbar input::placeholder{color:#6a727d;font-weight:600;}
  .searchbar button{border:0;background:var(--blue);color:#fff;font-family:inherit;font-weight:800;font-size:15px;padding:0 26px;cursor:pointer;transition:background .18s;white-space:nowrap;}
  .searchbar button:hover{background:var(--blue-dark);}
  .searchbar button .txt{display:inline;}
  .meta{display:flex;flex-wrap:wrap;gap:20px 26px;margin-top:24px;}
  .meta .it{display:flex;align-items:center;gap:9px;color:var(--muted);font-weight:700;font-size:14px;}
  .meta .it svg{width:18px;height:18px;color:var(--blue);flex:none;}

  /* Hero visual - file-lookup result mock */
  .visual{position:relative;}
  .visual::before{content:"";position:absolute;inset:auto -14px -16px 24px;height:80px;background:#dbe7fb;border-radius:0 0 22px 22px;z-index:0;opacity:.6;}
  .panel{position:relative;z-index:1;background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow-lg);padding:16px;}
  .panel .bar{display:flex;align-items:center;gap:8px;margin-bottom:14px;}
  .panel .bar i{width:11px;height:11px;border-radius:50%;background:#e2e8f1;display:block;flex:none;}
  .panel .bar i:nth-child(1){background:#ff5f57;}
  .panel .bar i:nth-child(2){background:#febc2e;}
  .panel .bar i:nth-child(3){background:#28c840;}
  .panel .url{flex:1;margin-left:8px;background:var(--bg-soft);border:1px solid var(--line);border-radius:8px;padding:7px 12px;font-size:12px;font-weight:700;color:#667285;display:flex;align-items:center;gap:7px;overflow:hidden;}
  .panel .url svg{width:13px;height:13px;color:#9fb4cf;flex:none;}
  .panel .url b{color:var(--ink);}

  .result{border:1px solid var(--line);border-radius:14px;padding:18px;background:linear-gradient(180deg,#fff,#fbfdff);}
  .rhead{display:flex;align-items:center;gap:14px;}
  .bigicon{width:56px;height:56px;border-radius:14px;flex:none;display:flex;align-items:center;justify-content:center;font-weight:900;font-size:15px;color:#fff;letter-spacing:.02em;background:linear-gradient(135deg,#e23b3b,#f15a4a);box-shadow:0 8px 18px rgba(226,59,59,.30);}
  .rtitle{display:flex;align-items:center;gap:9px;font-size:22px;font-weight:900;color:var(--navy);line-height:1;}
  .verified{display:inline-flex;align-items:center;gap:4px;background:#e7f7ee;color:#107d51;font-size:11px;font-weight:800;padding:4px 8px;border-radius:999px;letter-spacing:.02em;}
  .verified svg{width:12px;height:12px;}
  .rsub{color:var(--muted);font-weight:700;font-size:14px;margin-top:6px;}
  .rmeta{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px;}
  .rmeta .m{background:#fff;border:1px solid var(--line);border-radius:10px;padding:10px 12px;}
  .rmeta .m span{display:block;font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:#6a727d;}
  .rmeta .m b{font-size:14px;font-weight:800;color:var(--navy);}
  .rmeta .m b.stars{color:#996715;letter-spacing:1px;}
  .opens{margin-top:16px;display:flex;align-items:center;gap:10px;flex-wrap:wrap;}
  .opens .ol{font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:#6a727d;}
  .opens .app{display:inline-flex;align-items:center;gap:6px;background:var(--bg-soft);border:1px solid var(--line);border-radius:8px;padding:6px 11px;font-size:13px;font-weight:800;color:var(--navy);}
  .opens .app .d{width:8px;height:8px;border-radius:2px;background:var(--blue);}

  /* error + fix-tips variant */
  .bigicon.warn{background:linear-gradient(135deg,#ff7a45,#f5a623);box-shadow:0 8px 18px rgba(245,140,35,.32);}
  .bigicon.warn svg{width:28px;height:28px;color:#fff;}
  .solved{background:#e7f7ee;color:#107d51;}
  .ecode{margin-top:13px;display:flex;align-items:center;gap:9px;background:#fff5f3;border:1px solid #ffd9d1;border-radius:10px;padding:10px 13px;font-size:13px;font-weight:700;color:#c0392b;}
  .ecode svg{width:16px;height:16px;flex:none;}
  .ecode b{font-family:ui-monospace,Menlo,Consolas,monospace;font-weight:800;}
  .fixlabel{font-size:11px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:#6a727d;margin:16px 0 10px;}
  .steps{display:flex;flex-direction:column;gap:10px;}
  .step{display:flex;align-items:flex-start;gap:11px;}
  .step .num{width:24px;height:24px;flex:none;border-radius:7px;background:#e8f1ff;color:var(--blue);font-weight:900;font-size:13px;display:flex;align-items:center;justify-content:center;}
  .step .stx{font-size:13.5px;font-weight:700;color:var(--ink);line-height:1.4;}
  .step .stx code{font-family:ui-monospace,Menlo,Consolas,monospace;background:var(--bg-soft);border:1px solid var(--line);border-radius:5px;padding:1px 6px;font-size:12px;color:var(--navy);}

  .filerow{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:12px;}
  .filerow .f{display:flex;align-items:center;gap:9px;background:#fff;border:1px solid var(--line);border-radius:10px;padding:9px 11px;min-width:0;transition:border-color .15s,transform .15s;}
  .filerow .f:hover{border-color:#cfe0ff;transform:translateY(-2px);}
  .filerow .f .ext{font-weight:900;font-size:11px;color:#fff;background:var(--blue);border-radius:6px;padding:4px 7px;flex:none;}
  .filerow .f .ext.g{background:#16a36a;}
  .filerow .f .ext.o{background:#e8833a;}
  .filerow .f small{color:var(--muted);font-weight:700;font-size:12px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;}

  /* ---------- Cards ---------- */
  .cards-sec{padding:74px 0 40px;}
  .sec-head{text-align:center;margin-bottom:46px;}
  .sec-head h2{font-size:clamp(26px,3.4vw,33px);font-weight:900;letter-spacing:-.01em;color:var(--navy);}
  .sec-head p{color:var(--muted);font-size:17px;margin-top:8px;}
  .grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;}
  .card{position:relative;background:#fff;border:1px solid var(--line);border-radius:18px;padding:34px 30px 32px;box-shadow:var(--shadow-sm);overflow:hidden;transition:transform .2s,box-shadow .2s,border-color .2s;}
  .card::before{content:"";position:absolute;top:0;left:0;right:0;height:5px;background:linear-gradient(90deg,var(--blue),#4f9cff);transform:scaleX(0);transform-origin:left;transition:transform .25s;}
  .card:hover{transform:translateY(-6px);box-shadow:var(--shadow-lg);border-color:#cfe0ff;}
  .card:hover::before{transform:scaleX(1);}
  .ico{width:62px;height:62px;border-radius:16px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#e8f1ff,#d6e6ff);color:var(--blue);margin-bottom:20px;}
  .ico svg{width:30px;height:30px;}
  .card h3{font-size:21px;font-weight:800;margin-bottom:9px;color:var(--navy);}
  .card p{color:var(--muted);font-size:15.5px;margin-bottom:20px;}
  .lnk{display:inline-flex;align-items:center;gap:7px;color:var(--blue);font-weight:800;font-size:15px;transition:gap .18s;}
  .card:hover .lnk{gap:12px;}
  .lnk svg{width:15px;height:15px;}

  /* ---------- Browse by Category ---------- */
  .cat-head{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:30px;}
  .cat-head h2{font-size:clamp(26px,3.4vw,33px);font-weight:900;letter-spacing:-.01em;color:var(--navy);}
  .cat-head p{color:var(--muted);font-size:16px;margin-top:6px;}
  .viewall{display:inline-flex;align-items:center;gap:7px;color:var(--blue);font-weight:800;font-size:15px;white-space:nowrap;transition:gap .18s;}
  .viewall:hover{gap:11px;color:var(--blue-dark);}
  .viewall svg{width:16px;height:16px;}
  .cat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:16px;}
  .cat-card{display:flex;align-items:flex-start;gap:13px;background:#fff;border:1px solid #d4e2f7;border-radius:14px;padding:18px 16px;box-shadow:0 1px 2px rgba(13,110,253,.04);transition:transform .18s,box-shadow .18s,border-color .18s;}
  .cat-card:hover{transform:translateY(-4px);box-shadow:0 10px 26px rgba(13,110,253,.16);border-color:#6ea8ff;}
  /* alternating accent colors: blue · green · orange */
  .cat-card:nth-child(3n+2){border-color:#c8ecdc;}
  .cat-card:nth-child(3n+2):hover{border-color:#3fbf8c;box-shadow:0 10px 26px rgba(22,163,106,.18);}
  .cat-card:nth-child(3n+2) .ci{background:linear-gradient(135deg,#e7f7ee,#d2efe0);color:#107d51;}
  .cat-card:nth-child(3n){border-color:#f6e0cb;}
  .cat-card:nth-child(3n):hover{border-color:#ef9b53;box-shadow:0 10px 26px rgba(232,131,58,.20);}
  .cat-card:nth-child(3n) .ci{background:linear-gradient(135deg,#fdf0e4,#fbe0c9);color:#e8833a;}
  .cat-card .ci{width:42px;height:42px;flex:none;border-radius:11px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#e8f1ff,#d6e6ff);color:var(--blue);}
  .cat-card .ci svg{width:22px;height:22px;}
  .cat-card .cb{min-width:0;}
  .cat-card .ct{display:block;font-size:15px;font-weight:800;color:var(--navy);line-height:1.25;}
  .cat-card .cn{display:block;font-size:12.5px;font-weight:700;color:var(--muted);margin-top:5px;}
  @media (max-width:1120px){ .cat-grid{grid-template-columns:repeat(4,1fr);} }
  @media (max-width:900px){ .cat-grid{grid-template-columns:repeat(3,1fr);} }
  @media (max-width:680px){ .cat-grid{grid-template-columns:repeat(2,1fr);gap:12px;} }
  @media (max-width:420px){ .cat-grid{grid-template-columns:1fr;} }

  /* ---------- Stats band ---------- */
  .band{position:relative;overflow:hidden;margin:72px 0 0;background:linear-gradient(135deg,#0a2142,#11365f 55%,#0c2b54);}
  .band::before{content:"";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:42px 42px;-webkit-mask-image:radial-gradient(120% 120% at 50% 0%,#000,transparent 72%);mask-image:radial-gradient(120% 120% at 50% 0%,#000,transparent 72%);opacity:.6;}
  .band::after{content:"";position:absolute;left:50%;top:-45%;width:640px;height:640px;transform:translateX(-50%);background:radial-gradient(circle,rgba(47,134,255,.22),transparent 60%);pointer-events:none;}
  .band .wrap{position:relative;z-index:1;display:grid;grid-template-columns:repeat(3,1fr);gap:24px;padding:54px 24px;}
  .stat{position:relative;text-align:center;color:#fff;display:flex;flex-direction:column;align-items:center;}
  .stat:not(:last-child)::after{content:"";position:absolute;right:-12px;top:50%;transform:translateY(-50%);height:66px;width:1px;background:linear-gradient(180deg,transparent,rgba(255,255,255,.20),transparent);}
  .stat .si{width:50px;height:50px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.15);color:#8fb8f5;margin-bottom:16px;}
  .stat .si svg{width:24px;height:24px;}
  .stat .n{font-size:clamp(30px,4.2vw,42px);font-weight:900;letter-spacing:-.02em;line-height:1;background:linear-gradient(180deg,#ffffff,#bcd5ff);-webkit-background-clip:text;background-clip:text;color:transparent;}
  .stat .l{font-size:15px;font-weight:700;color:#9fc0f0;margin-top:8px;}

  /* ---------- Footer ---------- */
  footer{position:relative;overflow:hidden;background:linear-gradient(180deg,#0c1b33,#0a1729);color:#aebdd4;padding:58px 0 26px;}
  footer::before{content:"";position:absolute;left:0;right:0;top:0;height:3px;background:linear-gradient(90deg,var(--blue),#16a36a 50%,#e8833a);}
  footer::after{content:"";position:absolute;left:50%;top:-130px;width:560px;height:260px;transform:translateX(-50%);background:radial-gradient(circle,rgba(47,134,255,.16),transparent 65%);pointer-events:none;}
  .foot-top{position:relative;z-index:1;display:flex;justify-content:space-between;gap:48px;flex-wrap:wrap;padding-bottom:32px;border-bottom:1px solid rgba(255,255,255,.10);}
  .foot-brand{max-width:330px;}
  .foot-brand img{height:30px;width:auto;}
  .foot-brand p{font-size:15px;margin-top:14px;color:#8fa1bd;line-height:1.6;}
  .socials{display:flex;gap:10px;margin-top:18px;}
  .socials a{width:38px;height:38px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.12);color:#bcd0ee;transition:background .18s,color .18s,transform .18s,border-color .18s;}
  .socials a:hover{background:var(--blue);border-color:var(--blue);color:#fff;transform:translateY(-2px);}
  .socials a.fb:hover{background:#1877f2;border-color:#1877f2;}
  .socials a.ig:hover{background:#e1306c;border-color:#e1306c;}
  .socials a.yt:hover{background:#ff0000;border-color:#ff0000;}
  .socials a.li:hover{background:#0a66c2;border-color:#0a66c2;}
  .socials a svg{width:18px;height:18px;}
  .foot-links{display:flex;gap:54px;flex-wrap:wrap;}
  .foot-col h3{color:#fff;font-size:13px;text-transform:uppercase;letter-spacing:.07em;margin-bottom:14px;}
  .foot-col a{display:block;color:#9fb0cc;font-weight:600;font-size:14.5px;padding:5px 0;transition:color .15s;}
  .foot-col a:hover{color:#fff;}
  .foot-bottom{position:relative;z-index:1;display:flex;justify-content:space-between;align-items:center;gap:16px;flex-wrap:wrap;padding-top:22px;font-size:14px;color:#7e90ad;}
  .foot-bottom .legal{display:flex;gap:20px;align-items:center;}
  .foot-bottom a{transition:color .15s;}
  .foot-bottom a:hover{color:#fff;}
  .totop{display:inline-flex;align-items:center;gap:7px;color:#bcd0ee;font-weight:700;}
  .totop svg{width:15px;height:15px;}


  /* ---------- Category page ---------- */
  .cat-hero{background:linear-gradient(180deg,#fff,var(--bg-soft));border-bottom:1px solid var(--line);padding:30px 0 38px;}
  .crumb{display:flex;align-items:center;gap:8px;font-size:13.5px;font-weight:700;color:var(--muted);margin-bottom:22px;flex-wrap:wrap;}
  .crumb a{color:var(--muted);transition:color .15s;}
  .crumb a:hover{color:var(--blue);}
  .crumb svg{width:14px;height:14px;color:#b9c4d4;}
  .crumb .cur{color:var(--navy);}
  .cat-hero-top{display:flex;align-items:flex-start;gap:18px;}
  .cat-hero-ic{width:64px;height:64px;flex:none;border-radius:16px;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg,#e8f1ff,#d6e6ff);color:var(--blue);box-shadow:inset 0 0 0 1px rgba(13,110,253,.1);}
  .cat-hero-ic svg{width:32px;height:32px;}
  .cat-hero h1{font-size:clamp(28px,4vw,40px);font-weight:900;letter-spacing:-.02em;color:var(--navy);line-height:1.05;}
  .cat-hero-top p{color:var(--muted);font-size:16px;margin-top:7px;max-width:640px;}
  .cat-meta-row{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:20px;}
  .cat-meta-row .mr{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:700;color:var(--muted);}
  .cat-meta-row .mr svg{width:16px;height:16px;color:var(--blue);}
  .cat-search{margin-top:24px;max-width:560px;}

  .cat-body{padding:38px 0 66px;}
  .cat-layout{display:grid;grid-template-columns:250px 1fr;gap:34px;align-items:start;}
  .filters-toggle{display:none;align-items:center;justify-content:space-between;gap:10px;width:100%;font-family:inherit;font-weight:800;font-size:15px;color:var(--navy);background:#fff;border:1px solid #d4e2f7;border-radius:12px;padding:13px 16px;cursor:pointer;box-shadow:0 1px 2px rgba(13,110,253,.04);}
  .filters-toggle .ft-l{display:flex;align-items:center;gap:10px;}
  .filters-toggle .ft-l svg{width:18px;height:18px;color:var(--blue);}
  .filters-toggle .chev{width:18px;height:18px;color:var(--blue);transition:transform .2s;}
  .filters-toggle[aria-expanded="true"] .chev{transform:rotate(180deg);}
  .cat-side{position:sticky;top:92px;display:flex;flex-direction:column;gap:18px;}
  .side-box{background:#fff;border:1px solid #d4e2f7;border-radius:14px;padding:18px;box-shadow:var(--shadow-sm);}
  .side-box h2{font-size:12px;font-weight:800;text-transform:uppercase;letter-spacing:.05em;color:#6a727d;margin-bottom:12px;}
  .sub-list{display:flex;flex-direction:column;gap:2px;}
  .sub-list a{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:8px 10px;border-radius:8px;font-size:14px;font-weight:700;color:#3a4a63;transition:background .15s,color .15s;}
  .sub-list a:hover{background:var(--bg-soft);color:var(--blue);}
  .sub-list a.active{background:#e7f0ff;color:var(--blue-dark);}
  .sub-list a .c{font-size:12px;font-weight:800;color:#6a727d;}
  .sub-list a.active .c{color:var(--blue);}
  .pills{display:flex;flex-wrap:wrap;gap:8px;}
  .pill{font-size:13px;font-weight:800;padding:6px 12px;border-radius:999px;border:1px solid var(--line);color:#3a4a63;cursor:pointer;background:#fff;transition:background .15s,border-color .15s,color .15s;}
  .pill:hover{border-color:#9fc1ff;color:var(--blue);}
  .pill.on{background:var(--blue);border-color:var(--blue);color:#fff;}
  .side-cta{background:linear-gradient(135deg,#0b2545,#11365f);border:0;color:#fff;}
  .side-cta h2{color:#9fc0f0;}
  .side-cta p{font-size:13.5px;color:#c4d5ef;margin-bottom:14px;line-height:1.5;}
  .side-cta a{display:inline-flex;align-items:center;gap:7px;background:var(--blue);color:#fff;font-weight:800;font-size:14px;padding:9px 16px;border-radius:10px;transition:background .18s;}
  .side-cta a:hover{background:#2f86ff;}
  .side-cta a svg{width:15px;height:15px;}

  .cat-toolbar{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-bottom:18px;flex-wrap:wrap;}
  .cat-toolbar .count{font-size:15px;font-weight:700;color:var(--muted);}
  .cat-toolbar .count b{color:var(--navy);}
  .sortsel{display:inline-flex;align-items:center;gap:9px;font-size:14px;font-weight:700;color:var(--muted);}
  .sortsel select{font-family:inherit;font-weight:800;font-size:14px;color:var(--navy);border:1px solid var(--line);background-color:#fff;border-radius:9px;padding:8px 32px 8px 12px;cursor:pointer;appearance:none;-webkit-appearance:none;background-image:url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%235b6573' stroke-width='3' stroke-linecap='round' stroke-linejoin='round'><path d='m6 9 6 6 6-6'/></svg>");background-repeat:no-repeat;background-position:right 11px center;}

  .sol-list{display:flex;flex-direction:column;gap:14px;}
  .sol{position:relative;display:flex;align-items:flex-start;gap:16px;background:#fff;border:1px solid #d4e2f7;border-radius:14px;padding:20px 22px;box-shadow:0 1px 2px rgba(13,110,253,.04);transition:transform .16s,box-shadow .16s,border-color .16s;}
  .sol:hover{transform:translateY(-3px);box-shadow:0 10px 26px rgba(13,110,253,.16);border-color:#6ea8ff;}
  .sol:nth-child(3n+2){border-color:#c8ecdc;}
  .sol:nth-child(3n+2):hover{border-color:#3fbf8c;box-shadow:0 10px 26px rgba(22,163,106,.18);}
  .sol:nth-child(3n){border-color:#f6e0cb;}
  .sol:nth-child(3n):hover{border-color:#ef9b53;box-shadow:0 10px 26px rgba(232,131,58,.20);}
  .sol-main{flex:1;min-width:0;}
  .sol-top{display:flex;flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:10px;}
  .ecode-chip{font-family:ui-monospace,Menlo,Consolas,monospace;font-size:12px;font-weight:800;color:var(--navy);background:var(--bg-soft);border:1px solid var(--line);border-radius:6px;padding:3px 8px;}
  .sol-tag{font-size:12px;font-weight:800;color:#5b6573;background:#eef2f8;border-radius:999px;padding:4px 10px;}
  .sol-tag.easy{background:#e7f7ee;color:#107d51;}
  .sol-tag.med{background:#fff3e6;color:#a55b19;}
  .sol-tag.adv{background:#fdeaea;color:#c0392b;}
  .sol-title{font-size:18px;font-weight:800;color:var(--navy);line-height:1.3;}
  .sol-desc{color:var(--muted);font-size:14.5px;margin-top:6px;line-height:1.5;}
  .sol-foot{display:flex;flex-wrap:wrap;gap:8px 18px;margin-top:13px;font-size:13px;font-weight:700;color:#697280;}
  .sol-foot .ff{display:inline-flex;align-items:center;gap:6px;}
  .sol-foot svg{width:14px;height:14px;color:#aeb8c8;}
  .sol-arrow{flex:none;align-self:center;width:34px;height:34px;border-radius:9px;display:flex;align-items:center;justify-content:center;color:var(--blue);background:#eef4ff;transition:transform .16s,background .16s,color .16s;}
  .sol:hover .sol-arrow{background:var(--blue);color:#fff;transform:translateX(3px);}
  .sol-arrow svg{width:17px;height:17px;}

  .pager{display:flex;align-items:center;justify-content:center;gap:8px;margin-top:36px;flex-wrap:wrap;}
  .pager a{min-width:40px;height:40px;padding:0 12px;border-radius:10px;border:1px solid var(--line);background:#fff;display:flex;align-items:center;justify-content:center;font-weight:800;font-size:14px;color:#3a4a63;transition:background .15s,border-color .15s,color .15s;}
  .pager a:hover{border-color:#9fc1ff;color:var(--blue);}
  .pager a.active{background:var(--blue);border-color:var(--blue);color:#fff;}
  .pager a.dots{border:0;background:transparent;cursor:default;color:#6a727d;}
  .pager a svg{width:16px;height:16px;}
  @media (max-width:900px){
    .cat-layout{grid-template-columns:1fr;gap:16px;}
    .filters-toggle{display:flex;}
    .cat-side{position:static;display:none;}
    .cat-side.open{display:flex;}
  }
  @media (max-width:600px){
    .sol{padding:18px;gap:13px;}
    .sol-arrow{align-self:flex-start;margin-top:2px;}
  }

  .sol-sentinel{height:1px;}
  .sol-loader{display:none;align-items:center;justify-content:center;gap:12px;padding:28px 0 6px;color:var(--muted);font-weight:700;font-size:14px;}
  .sol-loader.show{display:flex;}
  .sol-spin{width:22px;height:22px;border-radius:50%;border:3px solid #d8e3f4;border-top-color:var(--blue);animation:solspin .7s linear infinite;}
  @keyframes solspin{to{transform:rotate(360deg);}}
  .sol-end{display:none;text-align:center;padding:26px 0 4px;color:#6a727d;font-weight:700;font-size:14px;}
  .sol-end.show{display:block;}
  .sol-end b{color:var(--navy);}

  /* ---------- Responsive ---------- */
  @media (max-width:900px){
    .hero .wrap{grid-template-columns:1fr;gap:40px;}
    .visual{order:-1;max-width:520px;}
    .hero{padding:48px 0 56px;}
  }
  @media (max-width:760px){
    nav.links{display:none;}
    .burger{display:flex;}
    .mobile-menu{display:block;position:fixed;inset:72px 0 auto 0;background:#fff;border-bottom:1px solid var(--line);box-shadow:var(--shadow-md);padding:14px 24px 22px;transform:translateY(-130%);transition:transform .28s ease;z-index:55;}
    .mobile-menu.open{transform:translateY(0);}
    .mobile-menu a{display:block;font-weight:800;font-size:17px;color:var(--navy);padding:14px 6px;border-bottom:1px solid var(--line);}
    .mobile-menu a:last-child{border-bottom:0;}
    .mobile-menu a.cta{margin-top:12px;background:var(--blue);color:#fff;text-align:center;border-radius:11px;border:0;}
    .grid{grid-template-columns:1fr;gap:18px;}
    .cards-sec{padding:54px 0 30px;}
    .band .wrap{grid-template-columns:1fr;gap:30px;}
    .stat:not(:last-child)::after{display:none;}
    .sec-head{margin-bottom:34px;}
    .card{padding:28px 24px 26px;}
    .foot-top{flex-direction:column;gap:28px;}
    .foot-bottom{flex-direction:column;align-items:flex-start;gap:12px;}
  }
  @media (max-width:480px){
    .searchbar button .txt{display:none;}
    .searchbar button{padding:0 20px;}
    .hero h1{line-height:1.1;}
  }
  @media (prefers-reduced-motion:reduce){
    *{transition:none!important;scroll-behavior:auto;}
  }

  /* ---- a11y & perf additions (no visual change in normal use / steady state) ---- */
  .skip-link{position:absolute;left:-9999px;top:0;z-index:200;background:#0c1b33;color:#fff;padding:10px 16px;border-radius:0 0 10px 0;font-weight:800;text-decoration:none;}
  .skip-link:focus{left:0;}
  :focus-visible{outline:2px solid var(--blue);outline-offset:2px;}
  @font-face{font-family:'Nunito';font-style:normal;font-weight:400 900;font-display:optional;src:url('/assets/fonts/nunito-var.woff2') format('woff2');}
  @font-face{font-family:'Nunito Fallback';src:local('Arial'),local('Roboto'),local('Helvetica Neue'),local('Segoe UI');size-adjust:128.2%;ascent-override:78.8%;descent-override:27.5%;line-gap-override:0%;}
  footer{content-visibility:auto;contain-intrinsic-size:auto 480px;}