:root{
  --bg:#0B1220; --panel:rgba(255,255,255,0.04); --line:rgba(255,255,255,0.08);
  --text:#e5e7eb; --muted:#94a3b8;
  --accent:#6ee7b7; /* cyan-400 */
  --accent-strong:#059669; /* cyan-500 */
}
*{box-sizing:border-box}
html,body{height:100%}
body{
  margin:0; font-family:Inter,system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  background:var(--bg); color:var(--text); -webkit-font-smoothing:antialiased; line-height:1.6;
}
.container{max-width:1100px;margin-inline:auto;padding:0 20px}
.header-row,.footer-row{display:flex;align-items:center;justify-content:space-between;gap:16px; padding:20px 0; }
.site-header{position:sticky;top:0;background:rgba(11,18,32,.75);backdrop-filter:blur(8px);border-bottom:1px solid var(--line);z-index:20}
.brand{display:flex;align-items:center;gap:10px;text-decoration:none;color:var(--text);font-weight:700}
.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:var(--accent-strong);color:#021018;}
.brand-text{letter-spacing:.2px; font-size:20px; font-weight:700;}
.nav a{color:var(--accent);text-decoration:none;margin-left:16px;position:relative;font-weight:600}
.nav a:hover{opacity:.9}
.nav a.active::after,.nav a:hover::after{content:"";position:absolute;left:0;right:0;bottom:-6px;height:2px;background:currentColor}

.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line)}
.hero-bg{position:absolute;inset:0;z-index:0;pointer-events:none}
.hero-glow{position:absolute;left:50%;top:-160px;width:1024px;height:560px;transform:translateX(-50%);
  filter:blur(48px);
  background:radial-gradient(40% 40% at 50% 20%, rgba(34,211,238,.35), transparent 60%),
             radial-gradient(40% 40% at 60% 0%, rgba(217,70,239,.20), transparent 60%),
             radial-gradient(40% 40% at 40% 0%, rgba(99,102,241,.30), transparent 60%);
}
.hero-grid{position:absolute;inset:0;
  background:
    repeating-linear-gradient(to right, rgba(255,255,255,.06) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(to bottom, rgba(255,255,255,.06) 0 1px, transparent 1px 40px);
  -webkit-mask-image: radial-gradient(80% 60% at 50% 20%, rgba(0,0,0,1), rgba(0,0,0,0));
          mask-image: radial-gradient(80% 60% at 50% 20%, rgba(0,0,0,1), rgba(0,0,0,0));
}
.hero-inner{position:relative;z-index:1;padding:80px 0}
.cta-row{display:flex;flex-wrap:wrap;gap:12px;margin-top:16px}
.chips{display:flex;flex-wrap:wrap;gap:8px;list-style:none;padding:0;margin:16px 0 0}
.chips li{border:1px solid var(--line);background:var(--panel);padding:6px 10px;border-radius:999px;font-size:13px;color:#cbd5e1}

.btn{display:inline-flex;align-items:center;gap:8px;border-radius:14px;padding:10px 14px;font-weight:600;text-decoration:none}
.btn-primary{background:var(--accent-strong);color:#021018;border:1px solid rgba(34,211,238,.35)}
.btn-primary:hover{filter:brightness(1.05)}
.btn-outline{border:1px solid var(--line);background:var(--panel);color:var(--text)}
.btn-outline:hover{background:rgba(255,255,255,.07)}
.center{text-align:center}
.mt-24{margin-top:24px}

.section{padding:56px 0;border-top:1px solid var(--line)}
.section-title{font-size:24px;margin:0 0 16px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:16px}
@media (max-width:900px){.grid-3,.grid-2{grid-template-columns:1fr}}

.cards-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}
@media (max-width:900px){.cards-grid{grid-template-columns:1fr}}

.card{border:1px solid var(--line);background:var(--panel);border-radius:20px;padding:16px}
.card h3{margin:0 0 6px}
.card .meta{font-size:13px;color:var(--muted)}

.page-hero{padding:40px 0;border-bottom:1px solid var(--line)}
.filters{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
.filters input,.filters select,.form input,.form textarea{width:100%;max-width:320px;background:#0b1220;border:1px solid var(--line);color:var(--text);border-radius:12px;padding:10px}
.form textarea{max-width:none}
.form-note{font-size:12px;color:var(--muted);margin-top:8px}

.course-detail{display:grid;grid-template-columns:2fr 1fr;gap:16px}
@media (max-width:900px){.course-detail{grid-template-columns:1fr}}
.badge{display:inline-block;border:1px solid var(--line);background:var(--panel);padding:4px 8px;border-radius:999px;font-size:12px;color:#a5f3fc}
.session{border:1px solid var(--line);background:var(--panel);border-radius:14px;padding:12px;margin-top:8px}
.backlink{display:inline-block;margin:12px 0 16px;color:#8be9fb;text-decoration:none}
.backlink:hover{opacity:.9}

.muted{color:var(--muted)}
.site-footer{border-top:1px solid var(--line);padding:24px 0;margin-top:24px}