:root{
  --bg:#ffffff;
  --surface:#f7f9fc;
  --text:#0f172a;
  --muted:#475569;
  --primary:#2563eb;
  --primary-600:#1d4ed8;
  --accent:#10b981;
  --border:#e5e7eb;
  --card:#ffffff;
  --radius:16px;
}

*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial, "Apple Color Emoji","Segoe UI Emoji";
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
}

.container{max-width:1200px;margin:0 auto;padding:0 20px}

header{
  position:sticky;top:0;background:rgba(255,255,255,.9);
  backdrop-filter:saturate(180%) blur(12px); border-bottom:1px solid var(--border); z-index:50;
}
nav{
  display:flex;align-items:center;justify-content:space-between; padding:14px 0;
}
.brand{display:flex;align-items:center;gap:12px}
.brand img{height:28px;width:auto}
.brand .name{font-weight:800;letter-spacing:-.2px}
.brand .tag{font-size:.8rem;color:var(--muted);margin-top:-4px}

.nav-links{display:flex;gap:20px}
.nav-links a{color:var(--muted);text-decoration:none;font-weight:600}
.nav-links a:hover{color:var(--primary)}

.menu-btn{display:none;border:1px solid var(--border);background:#fff;border-radius:10px;padding:8px 10px}

.hero{background:linear-gradient(180deg, #f8fbff 0%, #ffffff 60%);}
.hero-wrap{display:grid;grid-template-columns:1.2fr .8fr;gap:40px;align-items:center;padding:56px 0}
.hero h1{font-size:clamp(28px,4vw,44px);line-height:1.2;margin:0 0 12px;font-weight:900;letter-spacing:-.5px}
.hero p{font-size:1.125rem;color:var(--muted);margin:0 0 16px}
.search{display:flex;gap:10px}
.search input{
  flex:1;padding:14px 16px;border:1px solid var(--border);border-radius:12px;font-size:1rem;
}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 18px;border-radius:12px;border:1px solid transparent;
  font-weight:700;text-decoration:none;cursor:pointer;
}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:var(--primary-600)}
.btn-outline{border-color:var(--border);color:var(--text);background:#fff}
.btn-outline:hover{border-color:var(--text)}

.hero img{width:100%;height:auto;border-radius:18px;border:1px solid var(--border)}

.section{padding:56px 0}
.section h2{font-size:clamp(24px,3vw,34px);margin:0 0 8px;font-weight:800}
.section .sub{color:var(--muted);margin:0 0 24px}

.grid{display:grid;gap:20px}
.grid-4{grid-template-columns:repeat(4,1fr)}
.grid-3{grid-template-columns:repeat(3,1fr)}
@media (max-width:1024px){.grid-4{grid-template-columns:repeat(3,1fr)}}
@media (max-width:780px){.hero-wrap{grid-template-columns:1fr}.grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}}
@media (max-width:520px){.grid-3,.grid-4{grid-template-columns:1fr}}

.card{
  background:var(--card);border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden; display:flex;flex-direction:column;
}
.card img{width:100%;height:160px;object-fit:cover}
.card .pad{padding:14px}
.badge{display:inline-flex;align-items:center;font-size:.75rem;font-weight:700;padding:4px 8px;border-radius:999px;border:1px solid var(--border);color:var(--muted)}
.title{font-weight:800;margin:8px 0 6px}
.meta{font-size:.9rem;color:var(--muted)}
.rating{display:flex;align-items:center;gap:6px;color:#b45309;font-weight:700}
.price{margin-left:auto;font-weight:800}
.row{display:flex;align-items:center;gap:12px}

.course-actions{margin-top:12px;display:flex;gap:10px}
.small{font-size:.85rem}

.category{padding:16px;border:1px dashed var(--border);border-radius:14px;background:var(--surface)}
.category h4{margin:6px 0 4px}
.category p{margin:0;color:var(--muted);font-size:.95rem}

.about{display:grid;grid-template-columns:1fr 1fr;gap:24px;align-items:center}
.about img{width:100%;height:auto;border-radius:16px;border:1px solid var(--border)}
@media (max-width:780px){.about{grid-template-columns:1fr}}

form .field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
input,textarea{font:inherit}
input[type="email"],input[type="text"],textarea{
  padding:12px 14px;border:1px solid var(--border);border-radius:12px
}
textarea{min-height:120px;resize:vertical}

footer{border-top:1px solid var(--border);padding:28px 0;background:#fff}
footer .row{justify-content:center;color:var(--muted)}
.footer-links{display:flex;gap:16px;flex-wrap:wrap}
.footer-links a{color:var(--muted);text-decoration:none}
.footer-links a:hover{color:var(--primary)}

.mobile{display:none}
@media (max-width:780px){
  .nav-links{display:none}
  .mobile{display:block}
}

.mobile-menu{display:none;position:fixed;inset:64px 0 0 0;background:#fff;border-top:1px solid var(--border);z-index:40}
.mobile-menu.active{display:block}
.mobile-menu a{display:block;padding:14px 20px;border-bottom:1px solid var(--border);color:var(--text);text-decoration:none}

.notice{
  padding:14px;border:1px solid var(--border);border-radius:12px;background:var(--surface);color:var(--muted); margin-bottom:16px
}

/* success page */
.success-hero{text-align:center;padding:60px 0}
.success-check{
  width:96px;height:96px;border-radius:999px;background:var(--accent);display:flex;align-items:center;justify-content:center;color:#fff;font-size:42px;margin:0 auto 16px
}

/* === AI & Chill Banner === */
.event-cta{
  display:flex; align-items:center; justify-content:space-between; gap:18px;
  width:100%; padding:18px 22px 18px 26px;
  border-radius:26px;
  text-decoration:none; color:#eaf2ff; position:relative;
  /* layered background: base gradient + grid lines + dots + right capsule */
  background:
    /* right capsule */
    radial-gradient(120px 220px at calc(100% - 140px) 50%, rgba(15,62,95,.9) 0%, rgba(15,62,95,.9) 60%, rgba(0,0,0,0) 61%),
    /* tiny dots */
    radial-gradient(2px 2px at 25px 25px, rgba(156, 81, 255, .35) 50%, rgba(0,0,0,0) 51%) 0 0/160px 80px,
    /* thin horizontal grid lines */
    repeating-linear-gradient(180deg, rgba(160, 120, 255, .2) 0 1px, rgba(0,0,0,0) 1px 40px),
    /* base gradient */
    linear-gradient(90deg, #5b2a84 0%, #1b1530 55%, #103a57 100%);
  box-shadow: 0 8px 28px rgba(25, 35, 70, .25);
}
.event-cta:hover{ transform: translateY(-1px); box-shadow:0 10px 34px rgba(25,35,70,.32); }
.event-cta__left{ display:flex; flex-direction:column; }
.event-cta__title{ font-weight:900; letter-spacing:.2px; font-size:1.1rem;
  text-shadow:0 0 8px rgba(255,255,255,.15);
}
.event-cta__meta{ color:#b9c7ff; margin-top:4px; font-weight:600; }

.event-cta__btn{
  flex:0 0 auto; white-space:nowrap;
  background:#2563eb; color:#fff; font-weight:800;
  padding:12px 18px; border-radius:16px; box-shadow:0 0 18px rgba(37,99,235,.35);
}
.event-cta__btn:hover{ filter:brightness(1.05); }

/* Responsive: stack on small screens */
@media (max-width:720px){
  .event-cta{ flex-direction:column; align-items:flex-start; padding:18px; }
  .event-cta__btn{ width:100%; text-align:center; }
}