:root{
  --bg: #0b1220;
  --panel: rgba(255,255,255,0.86);
  --card: rgba(255,255,255,0.92);
  --text: #0f172a;
  --muted: #475569;
  --line: rgba(15, 23, 42, 0.10);
  --shadow: 0 14px 40px rgba(2, 6, 23, 0.18);
  --shadow2: 0 10px 22px rgba(2, 6, 23, 0.12);
  --grad: linear-gradient(90deg, #4f46e5, #06b6d4);
  --accent: #4f46e5;
}

*{ box-sizing: border-box; }

body{
  margin:0;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(1100px 520px at 20% 0%, rgba(79,70,229,0.55), rgba(79,70,229,0) 60%),
    radial-gradient(900px 480px at 80% 10%, rgba(6,182,212,0.45), rgba(6,182,212,0) 55%),
    linear-gradient(180deg, #f6f8ff 0%, #eef2ff 35%, #f8fafc 100%);
  line-height: 1.55;
}

header{
  position: sticky;
  top: 0;
  z-index: 20;
  backdrop-filter: blur(10px);
  background: rgba(255,255,255,0.75);
  border-bottom: 1px solid var(--line);
}

.header-inner{
  max-width: 1100px;
  margin: 0 auto;
  padding: 12px 16px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap: 14px;
}

.brand{
  display:flex;
  align-items:center;
  gap: 10px;
  font-weight: 900;
  letter-spacing: 0.2px;
}

.brand img{ height: 34px; width:auto; display:block; }

nav{
  display:flex;
  align-items:center;
  gap: 10px;
  flex-wrap: wrap;
}

nav a{
  text-decoration:none;
  color: #0f172a;
  font-weight: 650;
  padding: 8px 10px;
  border-radius: 12px;
}
nav a:hover{ background: rgba(79,70,229,0.10); }

main{
  max-width: 1100px;
  margin: 26px auto;
  padding: 0 16px;
}

.hero{
  padding: 18px;
  border: 1px solid var(--line);
  background: var(--panel);
  border-radius: 18px;
  box-shadow: var(--shadow2);
  overflow:hidden;
  position:relative;
}

.hero-grid{
  display:grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 16px;
  align-items:center;
}
@media (max-width: 860px){
  .hero-grid{ grid-template-columns: 1fr; }
}

.hero h1{
  margin: 0 0 8px;
  font-size: clamp(26px, 3vw, 38px);
  letter-spacing:-0.02em;
}
.hero p{ margin: 8px 0; color: var(--muted); font-size: 1.05rem; }

.hero-actions{
  display:flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}

.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap: 8px;
  padding: 10px 14px;
  border-radius: 14px;
  border: 1px solid var(--line);
  text-decoration:none;
  font-weight: 700;
  color: #0f172a;
  background: #fff;
}
.btn-primary{
  background: var(--grad);
  color: #fff;
  border: 0;
  box-shadow: 0 10px 24px rgba(79,70,229,0.25);
}
.btn:hover{ filter: brightness(1.02); }

.grid{
  display:grid;
  gap: 14px;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  margin-top: 14px;
}

.card{
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 16px;
  box-shadow: var(--shadow2);
}

.card h2{ margin: 0 0 8px; font-size: 1.2rem; }
.small{ color: var(--muted); font-size: 0.98rem; }
.mono{ font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace; }

input, select, button{
  font: inherit;
  padding: 10px 12px;
  border-radius: 14px;
  border: 1px solid rgba(2,6,23,0.14);
  background: #fff;
}

button{
  cursor:pointer;
  font-weight: 750;
}
button.primary{
  border: 0;
  background: var(--grad);
  color: #fff;
}

.badge{
  display:inline-flex;
  align-items:center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255,255,255,0.7);
  font-weight: 700;
  color: #0f172a;
}

.video-card{
  display:grid;
  grid-template-columns: 140px 1fr;
  gap: 12px;
  align-items:center;
}
@media (max-width: 540px){
  .video-card{ grid-template-columns: 1fr; }
}

.thumb{
  width: 140px;
  height: 84px;
  border-radius: 14px;
  overflow:hidden;
  border: 1px solid var(--line);
  background: #e2e8f0;
}
.thumb img{ width:100%; height:100%; object-fit:cover; display:block; }

.modal{
  position: fixed;
  inset: 0;
  display:none;
  place-items:center;
  background: rgba(2,6,23,0.70);
  padding: 18px;
  z-index: 50;
}
.modal.open{ display:grid; }

.modal-inner{
  width: min(980px, 100%);
  background: #0b1220;
  border: 1px solid rgba(255,255,255,0.14);
  border-radius: 18px;
  overflow:hidden;
  box-shadow: var(--shadow);
}

.modal-top{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding: 10px 12px;
  color:#e2e8f0;
  background: rgba(255,255,255,0.06);
}

.modal-title{ font-weight: 800; }
.modal-close{
  border: 0;
  background: rgba(255,255,255,0.12);
  color:#fff;
  padding: 8px 12px;
  border-radius: 12px;
}
.player{
  aspect-ratio: 16/9;
  width: 100%;
  border: 0;
  display:block;
}

footer{
  margin: 28px 0 36px;
  color: var(--muted);
  font-size: 0.95rem;
}