:root{
  --bg:#ffffff;
  --text:#0b1220;
  --muted:#5b667a;
  --card:#ffffff;
  --line:rgba(10,20,40,.10);
  --shadow: 0 18px 60px rgba(15, 23, 42, .10);
  --shadow2: 0 10px 30px rgba(15, 23, 42, .08);
  --radius: 18px;
}

*{ box-sizing:border-box; }
html,body{ height:100%; }
body{
  margin:0;
  font-family: Inter, system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  font-weight:500;
  color:var(--text);
  background:
    radial-gradient(1200px 600px at 15% 10%, rgba(99,102,241,.14), transparent 60%),
    radial-gradient(1000px 600px at 85% 15%, rgba(16,185,129,.14), transparent 55%),
    radial-gradient(900px 500px at 35% 90%, rgba(244,114,182,.14), transparent 55%),
    var(--bg);
}

.wrap{
  width:min(980px, 92vw);
  margin: 34px auto 64px;
}

.h1{
  font-family: Sora, system-ui, sans-serif;
  font-weight:800;
  letter-spacing:-.02em;
  font-size: clamp(28px, 4vw, 44px);
  margin: 10px 0 6px;
}

.sub{
  color: var(--muted);
  font-size: 16px;
  margin: 0 0 18px;
}

.back{
  display:inline-flex;
  color: var(--muted);
  text-decoration:none;
  padding: 8px 10px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: rgba(255,255,255,.65);
  backdrop-filter: blur(8px);
}

.row{
  display:flex;
  gap:12px;
  flex-wrap: wrap;
  margin: 16px 0 18px;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  text-decoration:none;
  font-weight:600;
  box-shadow: var(--shadow2);
  background: rgba(255,255,255,.80);
  color: var(--text);
}

.btn.primary{
  border-color: rgba(99,102,241,.35);
  background: linear-gradient(135deg, rgba(99,102,241,.95), rgba(99,102,241,.80));
  color: #fff;
}

.btn.ghost{
  background: rgba(255,255,255,.75);
}

.btn.disabled{
  opacity:.55;
  pointer-events:none;
}

.grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap:14px;
}
@media (max-width: 860px){
  .grid{ grid-template-columns: 1fr; }
}

.card{
  display:block;
  padding: 16px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.80);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  text-decoration:none;
  color: var(--text);
  transition: transform .10s ease;
}
.card:hover{ transform: translateY(-2px); }

.cardTitle{
  font-family: Sora, system-ui, sans-serif;
  font-weight:800;
  font-size: 18px;
  margin-bottom: 6px;
}

.cardText{
  color: var(--muted);
  font-size: 14px;
  line-height: 1.35;
}

.cardHint{
  margin-top: 10px;
  color: rgba(99,102,241,.95);
  font-weight: 700;
  font-size: 13px;
}

.panel{
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: rgba(255,255,255,.78);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  padding: 16px;
  margin-top: 14px;
}

.panelTitle{
  font-family: Sora, system-ui, sans-serif;
  font-weight:800;
  margin-bottom: 10px;
}

.bullets{
  margin: 0;
  padding-left: 18px;
  color: var(--text);
}
.bullets li{ margin: 8px 0; }
.muted{ color: var(--muted); margin-top: 10px; font-size: 13px; }

.video{
  position: relative;
  padding-top: 56.25%;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--line);
}
.video iframe{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  border:0;
}