/* tusafeli full redesign */
:root{
  --bg-0:#0b1226;
  --bg-1:#0f172a;
  --panel: rgba(255,255,255,0.06);
  --ink:#e5e7eb;
  --muted:#cbd5e1;
  --line: rgba(148,163,184,.22);
  --brand-1:#0ea5e9;
  --brand-2:#6366f1;
  --brand-3:#22d3ee;
  --accent:#10b981;
  --radius:18px;
  --shadow:0 12px 40px rgba(2,6,23,.5);
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0; color:var(--ink);
  background:
    radial-gradient(60% 60% at 10% 10%, rgba(14,165,233,.18), transparent 60%),
    radial-gradient(60% 60% at 90% 20%, rgba(99,102,241,.18), transparent 60%),
    linear-gradient(120deg, var(--bg-1), #0c142a 60%);
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Ubuntu, Cantarell;
  line-height:1.65;
}

.container{width:min(1200px, 92vw); margin:0 auto}
.section{padding:40px 0}
.muted{color:var(--muted)}

a{color:#c7d2fe}

/* ---- Header with two-row layout & mega menu ---- */
.header{
  position:sticky; top:0; z-index:60;
  backdrop-filter: blur(10px) saturate(140%);
  background: linear-gradient(180deg, rgba(2,6,23,.85), rgba(2,6,23,.55));
  border-bottom:1px solid var(--line);
}
.header-top{display:flex; align-items:center; gap:16px; padding:10px 0}
.brand{display:flex; align-items:center; gap:12px; text-decoration:none}
.brand img{width:42px;height:42px}
.brand span{font-weight:900; letter-spacing:.2px; background:linear-gradient(90deg,var(--brand-1),var(--brand-2),var(--brand-3)); -webkit-background-clip:text; background-clip:text; color:transparent; font-size:1.1rem}
.header-actions{margin-left:auto; display:flex; gap:8px}
.header-actions a{ text-decoration:none; color:#fff; font-weight:700; border:1px solid var(--line); padding:8px 12px; border-radius:12px }
.header-actions a.cta{ background:linear-gradient(90deg,var(--brand-2),var(--brand-3)); box-shadow:var(--shadow) }

.navbar{display:flex; gap:14px; flex-wrap:wrap; padding-bottom:10px}
.navbar a{ color:#e5e7eb; text-decoration:none; padding:8px 10px; border-radius:10px; border:1px solid transparent; }
.navbar a:hover{ background: rgba(255,255,255,.05); border-color: var(--line) }
.navbar .has-mega{ position:relative }
.mega{
  position:absolute; left:0; top:120%; display:none;
  background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid var(--line); border-radius:16px; padding:14px; box-shadow:var(--shadow);
  min-width:560px;
}
.has-mega:hover .mega{ display:grid; grid-template-columns: 1fr 1fr; gap:12px }

/* ---- Hero ---- */
.hero{
  display:grid; grid-template-columns: 1.2fr 1fr; gap:28px; align-items:center; padding:32px 0 10px;
}
.hero .panel{
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid var(--line); border-radius:24px; padding:18px; box-shadow:var(--shadow);
}
.hero h1{ font-size: clamp(2rem, 1.4rem + 2.6vw, 3.2rem); margin:.2rem 0 .5rem 0 }
.hero p.lead{ color:var(--muted) }
.hero img{ width:100%; border-radius:22px; box-shadow:var(--shadow); opacity:.96 }

.btn{ display:inline-flex; align-items:center; gap:8px; padding:10px 14px; border-radius:12px; text-decoration:none; font-weight:800; border:1px solid var(--line); color:#fff; }
.btn.primary{ background: linear-gradient(90deg, var(--brand-2), var(--brand-1)) }
.btn.ghost{ background: transparent }

.grid{ display:grid; gap:18px }
.grid.cols-3{ grid-template-columns: repeat(3, 1fr) }
.grid.cols-4{ grid-template-columns: repeat(4, 1fr) }
@media (max-width: 1000px){ .hero{ grid-template-columns:1fr } .grid.cols-3{ grid-template-columns:1fr 1fr } .grid.cols-4{ grid-template-columns:1fr 1fr } }
@media (max-width: 620px){ .grid.cols-3, .grid.cols-4{ grid-template-columns:1fr } }

.card{
  position:relative;
  background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03));
  border:1px solid var(--line); border-radius:18px; padding:16px; box-shadow:var(--shadow);
  transition: transform .15s ease, box-shadow .2s ease;
}
.card:hover{ transform: translateY(-2px); box-shadow: 0 18px 48px rgba(2,6,23,.65) }
.badge{ display:inline-block; padding:.2rem .5rem; border-radius:999px; border:1px solid var(--line); color:#e2e8f0; font-size:.78rem; background:rgba(14,165,233,.12) }

/* Reveal */
.reveal{ opacity:0; transform: translateY(12px); transition: all .6s ease }
.reveal.in-view{ opacity:1; transform: translateY(0) }

/* Article & course layouts */
.toc{ position:sticky; top:110px; align-self:start; background:linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03)); border:1px solid var(--line); border-radius:14px; padding:12px }
.toc a{ display:block; text-decoration:none; color:#cbd5e1; padding:4px 0 }
.toc a:hover{ text-decoration:underline }
.article-layout{ display:grid; grid-template-columns: 1fr 280px; gap:18px }
@media (max-width: 980px){ .article-layout{ grid-template-columns: 1fr } }

/* Tables and code */
table{ width:100%; border-collapse: collapse }
th, td{ padding:12px; border-bottom:1px dashed var(--line) }
th{ text-align:left; color:#c7d2fe }
pre{ background: rgba(2,6,23,.5); border:1px solid var(--line); padding:12px; border-radius:12px; overflow:auto }

/* FAQ */
.faq-item{ border:1px solid var(--line); border-radius:14px; margin-bottom:10px; overflow:hidden; background: linear-gradient(180deg, rgba(255,255,255,.06), rgba(255,255,255,.03)) }
.faq-q{ margin:0; padding:12px 14px; font-weight:800; cursor:pointer }
.faq-a{ display:none; padding:0 14px 14px; color:var(--muted) }
.faq-item.open .faq-a{ display:block }

/* Cookie banner */
.cookie-banner{
  position:fixed; left:16px; right:16px; bottom:16px; z-index:70; display:none;
  background: linear-gradient(180deg, rgba(255,255,255,.08), rgba(255,255,255,.03));
  border:1px solid var(--line); border-radius:14px; padding:14px; box-shadow:var(--shadow);
}
.cookie-actions{ display:flex; gap:10px; flex-wrap:wrap }
.cookie-actions button{ border:1px solid var(--line); background: linear-gradient(90deg, var(--brand-2), var(--brand-1)); color:#fff; padding:10px 12px; border-radius:10px; font-weight:800; cursor:pointer }
.cookie-actions button.secondary{ background: transparent; color:#e2e8f0 }

/* Footer */
.footer{ margin-top:40px; padding:30px 0 60px; border-top:1px solid var(--line); color:var(--muted) }
.footer a{ color:#c7d2fe; text-decoration:none }
.footer a:hover{ text-decoration:underline }