/* KVIZOLOVAC – App Design System */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600;800;900&display=swap');

:root{
  --bg0:#070B14;
  --bg1:#0B1022;
  --card:#0f172a;
  --card2:#111827;

  --text:#E5E7EB;
  --muted:#9AA7BD;

  --primary:#2A8CFF;
  --accent:#22D3EE;
  --success:#22C55E;
  --danger:#EF4444;
  --warning:#F59E0B;

  --border: rgba(229,231,235,.10);
  --shadow: 0 26px 70px rgba(0,0,0,.40);
  --shadow2: 0 14px 34px rgba(0,0,0,.35);

  --radius: 20px;
  --radius2: 28px;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  color:var(--text);
  background:
    radial-gradient(900px 500px at 18% -10%, rgba(42,140,255,.22), transparent 60%),
    radial-gradient(700px 420px at 85% 0%, rgba(34,211,238,.16), transparent 55%),
    radial-gradient(900px 500px at 20% 110%, rgba(42,140,255,.18), transparent 60%),
    linear-gradient(180deg, var(--bg1) 0%, var(--bg0) 50%, var(--bg0) 100%);
}

a{color:inherit;text-decoration:none}
.container{max-width:1200px;margin:0 auto;padding:0 18px}

/* UTIL */
.row{display:flex;gap:12px;align-items:center}
.space{height:14px}
.muted{color:var(--muted)}
.hr{height:1px;background:var(--border);margin:14px 0}
.hide{display:none !important}

/* SURFACES */
.glass{
  background: rgba(17,24,39,.55);
  border: 1px solid rgba(255,255,255,.08);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-radius: var(--radius2);
}
.card{
  background: linear-gradient(180deg, rgba(17,24,39,.92) 0%, rgba(15,23,42,.92) 100%);
  border:1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow2);
}

/* BRAND + NAV */
.nav{
  display:flex;align-items:center;justify-content:space-between;
  padding:16px 0;
  position: sticky;
  top:0;
  z-index:50;
}
.brand{
  display:flex;align-items:center;gap:10px;
  font-weight:900;letter-spacing:.6px;
}
.brand-mark{
  width:42px;height:42px;border-radius:16px;
  background: radial-gradient(circle at 30% 30%, #fff 0%, rgba(34,211,238,.40) 34%, rgba(42,140,255,.95) 100%);
  box-shadow: 0 18px 46px rgba(42,140,255,.28);
}
.nav-wrap{
  padding:10px 14px;
  border-radius:999px;
  background: rgba(17,24,39,.55);
  border: 1px solid rgba(255,255,255,.10);
  backdrop-filter: blur(14px);
  box-shadow: 0 12px 34px rgba(0,0,0,.25);
}
.nav-links{display:flex;gap:10px;align-items:center}
.nav-link{
  padding:10px 12px;border-radius:999px;
  font-weight:800;
  border:1px solid transparent;
  color:var(--text);
  transition: transform .16s ease, background .16s ease, border-color .16s ease;
}
.nav-link:hover{
  background: rgba(42,140,255,.10);
  border-color: rgba(42,140,255,.22);
  transform: translateY(-1px);
}

/* BUTTONS */
.btn{
  display:inline-flex;align-items:center;justify-content:center;
  padding:12px 16px;border-radius:999px;
  font-weight:900;letter-spacing:.2px;
  border:1px solid rgba(255,255,255,.10);
  box-shadow: 0 14px 34px rgba(0,0,0,.30);
  cursor:pointer;
  transition: transform .15s ease, filter .15s ease, box-shadow .15s ease;
  user-select:none;
}
.btn:active{transform: translateY(1px)}
.btn-primary{
  color:#05101f;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 120%);
  border-color: rgba(255,255,255,.16);
}
.btn-primary:hover{filter:brightness(1.02); box-shadow:0 22px 70px rgba(42,140,255,.22)}
.btn-ghost{
  background: rgba(17,24,39,.55);
  border-color: rgba(255,255,255,.10);
}
.btn-ghost:hover{transform: translateY(-1px); background: rgba(17,24,39,.65)}

/* BADGE */
.badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 12px;border-radius:999px;
  background: rgba(42,140,255,.12);
  border: 1px solid rgba(42,140,255,.24);
  color: #bfe6ff;
  font-weight:900;font-size:12px;
  letter-spacing:.2px;
}

/* GRID */
.grid{display:grid;gap:14px}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
@media (max-width: 980px){
  .grid-3,.grid-2{grid-template-columns:1fr}
}

/* HERO */
.hero{
  margin-top:10px;
  padding:18px;
  display:grid;
  grid-template-columns: 1.25fr .75fr;
  gap:16px;
}
.hero h1{
  margin:10px 0 0;
  font-size:54px;
  line-height:1.02;
  letter-spacing:-1.1px;
}
.hero p{margin:12px 0 0;color:var(--muted);line-height:1.7}
.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}
.hero-stats{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin-top:16px}
.stat{
  padding:12px;border-radius:18px;
  background: rgba(17,24,39,.55);
  border:1px solid rgba(255,255,255,.08);
}
.stat b{display:block;font-size:18px}
.stat span{color:var(--muted);font-size:12px;font-weight:800}
@media(max-width:980px){
  .hero{grid-template-columns:1fr}
  .hero h1{font-size:38px}
}

/* HOW STEPS */
.how{padding:16px}
.how h3{margin:0 0 10px}
.step{
  display:flex;gap:12px;align-items:flex-start;
  padding:12px;border-radius:18px;
  background: rgba(17,24,39,.55);
  border:1px solid rgba(255,255,255,.08);
  transition: transform .15s ease;
}
.step:hover{transform: translateY(-2px)}
.step .num{
  width:32px;height:32px;border-radius:12px;
  display:flex;align-items:center;justify-content:center;
  font-weight:1000;color:#05101f;
  background: linear-gradient(135deg, var(--primary), var(--accent));
  box-shadow: 0 14px 34px rgba(42,140,255,.20);
}
.step p{margin:2px 0 0;color:var(--muted);font-size:13px;line-height:1.5}

/* QUIZ CARDS */
.kviz-card{
  padding:16px;
  position:relative;
  overflow:hidden;
  transition: transform .16s ease, box-shadow .16s ease, border-color .16s ease;
}
.kviz-card:before{
  content:"";
  position:absolute; inset:-90px -90px auto auto;
  width:210px; height:210px;
  background: radial-gradient(circle, rgba(34,211,238,.22), transparent 60%);
  transform: rotate(12deg);
}
.kviz-card:hover{
  transform: translateY(-3px);
  box-shadow: 0 26px 80px rgba(0,0,0,.45);
  border-color: rgba(42,140,255,.22);
}
.kviz-meta{color:var(--muted);font-size:12px;font-weight:900;letter-spacing:.2px}
.kviz-title{margin:10px 0 8px;font-size:18px}
.kviz-row{display:flex;justify-content:space-between;align-items:center;gap:10px;margin-top:12px}
.kviz-pill{
  padding:8px 10px;border-radius:999px;
  background: rgba(42,140,255,.10);
  border:1px solid rgba(42,140,255,.20);
  color:#bfe6ff;
  font-size:12px;font-weight:900;
}

/* QUIZ PLAYER */
.quiz{
  padding:18px;
  margin-top:16px;
}
.quiz-top{
  display:flex;justify-content:space-between;gap:10px;flex-wrap:wrap;
}
.pill{
  padding:10px 12px;border-radius:999px;
  background: rgba(17,24,39,.55);
  border:1px solid rgba(255,255,255,.08);
  font-weight:900;font-size:12px;color:var(--text);
}
.progress{
  height:10px;border-radius:999px;
  background: rgba(255,255,255,.08);
  overflow:hidden;
  border:1px solid rgba(255,255,255,.08);
}
.progress > div{
  height:100%;
  width:0%;
  background: linear-gradient(135deg, var(--primary) 0%, var(--accent) 120%);
  transition: width .2s ease;
}
.answer{
  padding:14px;border-radius:18px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(17,24,39,.55);
  cursor:pointer;
  transition: transform .14s ease, border-color .14s ease, background .14s ease;
}
.answer:hover{
  transform: translateY(-2px);
  border-color: rgba(42,140,255,.25);
  background: rgba(17,24,39,.70);
}
.answer.correct{border-color: rgba(34,197,94,.45); background: rgba(34,197,94,.12)}
.answer.wrong{border-color: rgba(239,68,68,.45); background: rgba(239,68,68,.12)}

/* FORMS */
.input{
  width:100%;
  padding:12px 14px;border-radius:16px;
  border:1px solid rgba(255,255,255,.10);
  outline:none;
  background: rgba(17,24,39,.55);
  color:var(--text);
}
.input:focus{
  border-color: rgba(42,140,255,.35);
  box-shadow: 0 0 0 5px rgba(42,140,255,.12);
}
.notice{
  padding:12px 14px;border-radius:16px;
  border:1px solid rgba(255,255,255,.10);
  background: rgba(42,140,255,.10);
  color:#dbeafe;
}

/* FOOTER */
.footer{
  padding:34px 0;margin-top:44px;
  border-top:1px solid rgba(255,255,255,.08);
  background:
    radial-gradient(900px 400px at 20% 110%, rgba(42,140,255,.18), transparent 60%),
    linear-gradient(180deg, rgba(7,11,20,0) 0%, rgba(7,11,20,1) 40%);
}
.footer-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:16px}
@media(max-width:980px){.footer-grid{grid-template-columns:1fr}}
.small{font-size:12px;color:var(--muted);line-height:1.6}