@import url('https://fonts.googleapis.com/css2?family=Space+Grotesk:wght@500;700&family=Hind+Siliguri:wght@400;600&family=Inter:wght@400;500&display=swap');

:root{
  --bg:#0e1013;
  --surface:#181b21;
  --surface-2:#20242c;
  --accent:#7c5cff;
  --accent-2:#baff29;
  --text:#e9e8ef;
  --muted:#8b8fa3;
  --danger:#ff6b6b;
  --radius:10px;
}

*{box-sizing:border-box;}
html,body{margin:0;padding:0;}
body{
  background:var(--bg);
  color:var(--text);
  font-family:'Inter','Hind Siliguri',sans-serif;
  min-height:100vh;
  line-height:1.5;
}

.bangla{font-family:'Hind Siliguri','Inter',sans-serif;}

a{color:var(--accent-2);}

/* ---------- Login Screen ---------- */
#login-screen{
  min-height:100vh;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}
.login-card{
  width:100%;
  max-width:380px;
  background:var(--surface);
  border:1px solid #2a2f3a;
  border-radius:var(--radius);
  padding:32px 28px;
  text-align:center;
}
.login-card h1{
  font-family:'Space Grotesk',sans-serif;
  font-size:22px;
  margin:0 0 4px;
}
.login-card p.sub{
  color:var(--muted);
  font-size:13px;
  margin:0 0 24px;
}
#pw-input{
  width:100%;
  padding:12px 14px;
  border-radius:8px;
  border:1px solid #2a2f3a;
  background:var(--bg);
  color:var(--text);
  font-size:14px;
  margin-bottom:12px;
  outline:none;
}
#pw-input:focus{border-color:var(--accent);}
#login-btn{
  width:100%;
  padding:12px 14px;
  border-radius:8px;
  border:none;
  background:var(--accent);
  color:#fff;
  font-weight:600;
  font-size:14px;
  cursor:pointer;
}
#login-btn:hover{opacity:.9;}
#login-error{
  color:var(--danger);
  font-size:13px;
  margin-top:10px;
  min-height:16px;
}

/* ---------- Dashboard ---------- */
#dashboard{display:none;}
header.top{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:20px 6vw;
  border-bottom:1px solid #22262f;
}
header.top .brand{
  font-family:'Space Grotesk',sans-serif;
  font-weight:700;
  font-size:18px;
}
header.top .brand span{color:var(--accent-2);}

#logout-btn{
  background:none;
  border:1px solid #2a2f3a;
  color:var(--muted);
  padding:8px 14px;
  border-radius:6px;
  cursor:pointer;
  font-size:13px;
}
#logout-btn:hover{color:var(--text);border-color:var(--accent);}

main{
  padding:36px 6vw 60px;
  max-width:1000px;
  margin:0 auto;
}
main h2{
  font-family:'Space Grotesk',sans-serif;
  font-size:20px;
  margin:0 0 4px;
}
main p.desc{color:var(--muted);font-size:14px;margin:0 0 28px;}

.download-bar{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  flex-wrap:wrap;
  background:var(--surface);
  border:1px solid #22262f;
  border-radius:var(--radius);
  padding:16px 20px;
  margin-bottom:28px;
}
.download-bar .label{font-size:14px;color:var(--muted);}
#download-all{
  background:var(--accent-2);
  color:#101210;
  border:none;
  padding:10px 18px;
  border-radius:8px;
  font-weight:600;
  font-size:13px;
  cursor:pointer;
}
#download-all:hover{opacity:.9;}

.lessons{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
  gap:16px;
}
.lesson-card{
  background:var(--surface);
  border:1px solid #22262f;
  border-radius:var(--radius);
  padding:18px;
}
.lesson-card .num{
  display:inline-block;
  font-family:'Space Grotesk',sans-serif;
  font-size:12px;
  color:var(--accent-2);
  border:1px solid #2a2f3a;
  border-radius:20px;
  padding:2px 10px;
  margin-bottom:10px;
}
.lesson-card h3{margin:0 0 10px;font-size:16px;}
.lesson-card video{
  width:100%;
  border-radius:8px;
  background:#000;
  display:block;
}

.promo{
  margin-top:36px;
  padding:16px 20px;
  border:1px dashed #2a2f3a;
  border-radius:var(--radius);
  font-size:13px;
  color:var(--muted);
}
.promo a{font-weight:600;}

footer.foot{
  text-align:center;
  color:var(--muted);
  font-size:12px;
  padding:24px 0 40px;
}