/* ============ DESIGN TOKENS ============ */
  :root{
    --void:        #0a0f1d;   /* main background */
    --panel:       #10182c;   /* card / section background */
    --panel-2:     #141d35;   /* slightly lighter panel */
    --line:        #24304e;   /* borders */
    --electric:    #4ea8ff;   /* primary accent */
    --electric-dim:#2c6fb0;
    --cyan:        #22d3ee;   /* secondary accent, used sparingly */
    --amber:       #f5b95a;   /* rare highlight, "featured" only */
    --text:        #e9eef8;
    --text-dim:    #93a1bd;
    --text-faint:  #5d6a89;
    --radius-lg:   18px;
    --radius-sm:   10px;
    --maxw:        1180px;
  }

  *{box-sizing:border-box; margin:0; padding:0;}
  html{scroll-behavior:smooth;}
  body{
    background:var(--void);
    color:var(--text);
    font-family:'Inter', sans-serif;
    line-height:1.5;
    overflow-x:hidden;
  }
  h1,h2,h3,h4{font-family:'Space Grotesk', sans-serif; font-weight:600; letter-spacing:-0.01em;}
  a{color:inherit; text-decoration:none;}
  img{max-width:100%; display:block;}
  ::selection{background:var(--electric-dim); color:#fff;}

  .wrap{max-width:var(--maxw); margin:0 auto; padding:0 28px;}

  /* subtle background texture — soft grid + two glows, never neon-bright */
  .bg-fx{
    position:fixed; inset:0; z-index:-1; pointer-events:none;
    background:
      radial-gradient(600px 400px at 12% -5%, rgba(78,168,255,0.16), transparent 60%),
      radial-gradient(500px 380px at 92% 18%, rgba(34,211,238,0.09), transparent 60%),
      linear-gradient(var(--void), var(--void));
  }
  .bg-fx::after{
    content:"";
    position:absolute; inset:0;
    background-image:
      linear-gradient(rgba(78,168,255,0.045) 1px, transparent 1px),
      linear-gradient(90deg, rgba(78,168,255,0.045) 1px, transparent 1px);
    background-size:64px 64px;
    mask-image:linear-gradient(to bottom, black, transparent 65%);
  }

  /* ============ NAV ============ */
  header{
    position:sticky; top:0; z-index:50;
    background:rgba(10,15,29,0.72);
    backdrop-filter:blur(14px) saturate(140%);
    border-bottom:1px solid var(--line);
  }
  nav{display:flex; align-items:center; justify-content:space-between; height:68px;}
  .logo{display:flex; align-items:center; gap:10px; font-family:'Space Grotesk'; font-weight:700; font-size:1.1rem;}
  .logo-mark{
    width:30px; height:30px; border-radius:8px;
    background:linear-gradient(135deg, var(--electric), var(--cyan));
    display:flex; align-items:center; justify-content:center;
    font-size:0.85rem; color:#04101f; font-weight:700;
  }
  .nav-links{display:flex; align-items:center; gap:30px; font-size:0.92rem; color:var(--text-dim);}
  .nav-links a{transition:color .2s;}
  .nav-links a:hover{color:var(--text);}
  .nav-cta{
    background:var(--electric); color:#04101f; font-weight:600;
    padding:9px 18px; border-radius:9px; font-size:0.9rem;
    transition:transform .15s, box-shadow .15s;
  }
  .nav-cta:hover{transform:translateY(-1px); box-shadow:0 6px 20px rgba(78,168,255,0.35);}
  .nav-toggle{display:none; background:none; border:none; color:var(--text); font-size:1.4rem; cursor:pointer;}

  @media (max-width:820px){
    .nav-links{
      position:absolute; top:68px; left:0; right:0;
      flex-direction:column; align-items:flex-start; gap:0;
      background:var(--panel); border-bottom:1px solid var(--line);
      max-height:0; overflow:hidden; transition:max-height .25s ease;
    }
    .nav-links.open{max-height:320px;}
    .nav-links a, .nav-links .nav-cta{width:100%; padding:16px 28px; border-bottom:1px solid var(--line);}
    .nav-cta{border-radius:0; text-align:center;}
    .nav-toggle{display:block;}
  }

  /* ============ HERO ============ */
  .hero{padding:92px 0 70px; position:relative;}
  .hero-tag{
    display:inline-flex; align-items:center; gap:8px;
    color:var(--cyan); font-size:0.85rem; font-weight:500;
    background:rgba(34,211,238,0.08); border:1px solid rgba(34,211,238,0.25);
    padding:6px 14px; border-radius:100px; margin-bottom:24px;
  }
  .hero-tag .dot{width:6px; height:6px; border-radius:50%; background:var(--cyan); box-shadow:0 0 8px var(--cyan);}
  h1.hero-title{
    font-size:clamp(2.3rem, 5.4vw, 3.7rem);
    line-height:1.08; max-width:760px; margin-bottom:22px;
  }
  h1.hero-title .accent{
    background:linear-gradient(100deg, var(--electric), var(--cyan));
    -webkit-background-clip:text; background-clip:text; color:transparent;
  }
  .hero-sub{color:var(--text-dim); font-size:1.08rem; max-width:560px; margin-bottom:36px;}

  /* search — the hero's centerpiece, framed like a command bar */
  .search-bar{
    display:flex; align-items:center; gap:12px;
    background:var(--panel); border:1px solid var(--line);
    border-radius:14px; padding:6px 6px 6px 20px; max-width:560px;
    box-shadow:0 20px 50px -20px rgba(0,0,0,0.6);
  }
  .search-bar svg{flex-shrink:0; color:var(--text-faint);}
  .search-bar input{
    flex:1; background:none; border:none; outline:none; color:var(--text);
    font-family:inherit; font-size:0.98rem; padding:12px 0;
  }
  .search-bar input::placeholder{color:var(--text-faint);}
  .search-bar button{
    background:var(--electric); color:#04101f; font-weight:600; font-size:0.9rem;
    border:none; padding:11px 20px; border-radius:9px; cursor:pointer;
    transition:transform .15s;
  }
  .search-bar button:hover{transform:translateY(-1px);}

  .hero-stats{display:flex; gap:36px; margin-top:44px; flex-wrap:wrap;}
  .hero-stats div{border-left:2px solid var(--electric-dim); padding-left:14px;}
  .hero-stats b{display:block; font-family:'Space Grotesk'; font-size:1.5rem;}
  .hero-stats span{color:var(--text-faint); font-size:0.85rem;}

  /* ============ SECTION SHELL ============ */
  section{padding:64px 0;}
  .section-head{display:flex; align-items:flex-end; justify-content:space-between; margin-bottom:32px; gap:20px; flex-wrap:wrap;}
  .section-head h2{font-size:1.7rem;}
  .section-head p{color:var(--text-dim); font-size:0.95rem; max-width:480px; margin-top:6px;}
  .see-all{color:var(--electric); font-size:0.9rem; font-weight:600; white-space:nowrap;}
  .see-all:hover{text-decoration:underline;}

  /* ============ CATEGORY GRID (asymmetric, not uniform cards) ============ */
  .cat-grid{
    display:grid;
    grid-template-columns:repeat(4, 1fr);
    grid-auto-rows:110px;
    gap:14px;
  }
  .cat{
    background:var(--panel);
    border:1px solid var(--line);
    border-radius:var(--radius-sm);
    padding:18px;
    display:flex; flex-direction:column; justify-content:space-between;
    transition:border-color .2s, transform .2s, background .2s;
  }
  .cat:hover{border-color:var(--electric-dim); transform:translateY(-3px); background:var(--panel-2);}
  .cat .n{color:var(--text-faint); font-size:0.78rem;}
  .cat .name{font-family:'Space Grotesk'; font-weight:600; font-size:1rem;}
  .cat.big{grid-column:span 2; grid-row:span 2;}
  .cat.big .name{font-size:1.3rem;}
  .cat.big .n{font-size:0.85rem;}

  @media (max-width:900px){
    .cat-grid{grid-template-columns:repeat(2, 1fr); grid-auto-rows:100px;}
    .cat.big{grid-column:span 2; grid-row:span 1;}
  }

  /* ============ TOOL CARDS ============ */
  .tool-grid{display:grid; grid-template-columns:repeat(3, 1fr); gap:18px;}
  .tool-card{
    background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-lg);
    padding:22px; position:relative; overflow:hidden;
    transition:border-color .2s, transform .2s;
  }
  .tool-card:hover{border-color:var(--electric-dim); transform:translateY(-4px);}
  .tool-card:hover::before{opacity:1;}
  .tool-card::before{
    content:""; position:absolute; inset:0; opacity:0; transition:opacity .3s; pointer-events:none;
    background:radial-gradient(220px 140px at 20% 0%, rgba(78,168,255,0.13), transparent 70%);
  }
  .tool-top{display:flex; align-items:flex-start; justify-content:space-between; margin-bottom:14px;}
  .tool-icon{
    width:42px; height:42px; border-radius:11px; flex-shrink:0;
    display:flex; align-items:center; justify-content:center;
    font-family:'Space Grotesk'; font-weight:700; font-size:1.1rem; color:#04101f;
  }
  .badge{
    font-size:0.7rem; font-weight:600; padding:3px 9px; border-radius:100px;
    color:var(--amber); border:1px solid rgba(245,185,90,0.35); background:rgba(245,185,90,0.08);
  }
  .tool-card h3{font-size:1.05rem; margin-bottom:6px;}
  .tool-card p{color:var(--text-dim); font-size:0.88rem; margin-bottom:16px; line-height:1.55;}
  .tool-foot{display:flex; align-items:center; justify-content:space-between;}
  .tool-cat{font-size:0.76rem; color:var(--text-faint);}
  .tool-visit{font-size:0.84rem; font-weight:600; color:var(--electric);}
  .tool-visit:hover{text-decoration:underline;}

  @media (max-width:900px){.tool-grid{grid-template-columns:repeat(2, 1fr);}}
  @media (max-width:600px){.tool-grid{grid-template-columns:1fr;}}

  /* ============ WHY STRIP ============ */
  .why{
    background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-lg);
    padding:44px; display:grid; grid-template-columns:repeat(3,1fr); gap:34px;
  }
  .why h3{font-size:1.02rem; margin-bottom:8px;}
  .why p{color:var(--text-dim); font-size:0.88rem;}
  .why .num{color:var(--electric); font-family:'Space Grotesk'; font-weight:700; font-size:0.85rem; margin-bottom:10px; display:block;}
  @media (max-width:720px){.why{grid-template-columns:1fr; padding:30px;}}

  /* ============ NEWSLETTER ============ */
  .news{
    background:linear-gradient(135deg, rgba(78,168,255,0.10), rgba(34,211,238,0.05));
    border:1px solid var(--line); border-radius:var(--radius-lg);
    padding:48px; display:flex; align-items:center; justify-content:space-between; gap:30px; flex-wrap:wrap;
  }
  .news h3{font-size:1.4rem; margin-bottom:8px;}
  .news p{color:var(--text-dim); font-size:0.92rem;}
  .news form{display:flex; gap:10px; flex-wrap:wrap;}
  .news input{
    background:var(--void); border:1px solid var(--line); border-radius:9px;
    padding:12px 16px; color:var(--text); font-family:inherit; min-width:240px; outline:none;
  }
  .news input:focus{border-color:var(--electric-dim);}
  .news button{
    background:var(--electric); color:#04101f; font-weight:600; border:none;
    padding:12px 22px; border-radius:9px; cursor:pointer; transition:transform .15s;
  }
  .news button:hover{transform:translateY(-1px);}

  /* ============ FOOTER ============ */
  footer{border-top:1px solid var(--line); padding:56px 0 30px; margin-top:40px;}
  .foot-grid{display:grid; grid-template-columns:1.4fr 1fr 1fr 1fr; gap:34px; margin-bottom:44px;}
  .foot-brand p{color:var(--text-faint); font-size:0.88rem; margin-top:12px; max-width:280px;}
  footer h4{font-size:0.86rem; color:var(--text); margin-bottom:14px;}
  footer ul{list-style:none;}
  footer li{margin-bottom:10px;}
  footer a{color:var(--text-dim); font-size:0.86rem; transition:color .2s;}
  footer a:hover{color:var(--electric);}
  .foot-bottom{
    display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px;
    padding-top:26px; border-top:1px solid var(--line);
    color:var(--text-faint); font-size:0.82rem;
  }
  @media (max-width:820px){.foot-grid{grid-template-columns:1fr 1fr;}}

  /* back to top */
  #top-btn{
    position:fixed; right:24px; bottom:24px; z-index:60;
    width:44px; height:44px; border-radius:50%;
    background:var(--panel); border:1px solid var(--line); color:var(--electric);
    display:flex; align-items:center; justify-content:center; cursor:pointer;
    opacity:0; pointer-events:none; transform:translateY(8px);
    transition:opacity .25s, transform .25s;
  }
  #top-btn.show{opacity:1; pointer-events:auto; transform:translateY(0);}

  /* scroll progress */
  #progress{position:fixed; top:0; left:0; height:2px; background:linear-gradient(90deg, var(--electric), var(--cyan)); z-index:100; width:0%;}