:root {
            --bg-dark: #0f172a;
            --card-bg: #1e293b;
            --accent-purple: #8b5cf6;
            --text-main: #f1f5f9;
            --text-dim: #94a3b8;
        }

        body {
            background-color: var(--bg-dark);
            color: var(--text-main);
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            margin: 0;
            padding: 20px;
            display: flex;
            flex-direction: column;
            align-items: center;
        }

        .header {
            text-align: center;
            margin-bottom: 30px;
            width: 100%;
            max-width: 500px;
        }

        .logo-img {
            width: 120px;
            margin-bottom: 15px;
           
        }

        .btn-back {
            background: none;
            border: 1px solid var(--accent-purple);
            color: var(--accent-purple);
            padding: 8px 15px;
            border-radius: 8px;
            cursor: pointer;
            text-decoration: none;
            font-size: 14px;
            display: inline-block;
            margin-bottom: 20px;
            transition: 0.3s;
        }

        .btn-back:hover {
            background: var(--accent-purple);
            color: white;
        }

        .container {
            width: 100%;
            max-width: 500px;
        }

        .section-card {
            background: var(--card-bg);
            border-radius: 15px;
            padding: 20px;
            margin-bottom: 25px;
            box-shadow: 0 4px 15px rgba(0,0,0,0.3);
            border-left: 4px solid var(--accent-purple);
        }

        .section-title {
            font-size: 20px;
            color: var(--accent-purple);
            margin-top: 0;
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .video-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 0;
            border-bottom: 1px solid rgba(148, 163, 184, 0.1);
        }

        .video-item:last-child { border-bottom: none; }

        .video-info { flex-grow: 1; }

        .video-name {
            font-size: 16px;
            color: #d1d5db;
            margin: 0;
            cursor: pointer;
        }

        .video-name:hover { color: var(--accent-purple); }

        .click-text {
            font-size: 11px;
            color: var(--text-dim);
        }

        .note {
            font-size: 12px;
            color: #6366f1;
            font-style: italic;
            margin-top: 10px;
            display: block;
        }

        .tutorial-btn {
            background: linear-gradient(135deg, #6d28d9, #4f46e5);
            color: white;
            border: none;
            padding: 10px;
            border-radius: 8px;
            width: 100%;
            margin-top: 10px;
            cursor: pointer;
            font-weight: bold;
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 8px;
        }

/* Sidebar Fixed - Width & Box Sizing Fix */
.sidebar {
  width: 260px; /* Slightly wider for better text fit */
  background: #0f0f1a; 
  border-right: 1px solid rgba(255,255,255,0.1); /* Soft border */
  height: 100vh; 
  position: fixed; 
  left: 0; 
  top: 0; 
  padding: 20px; 
  z-index: 999; 
  transition: 0.3s;
  display: flex;
  flex-direction: column;
}

.sidebar a { 
  display: block; 
  padding: 12px; 
  color: #bbb; 
  text-decoration: none; 
  border-radius: 8px; 
  margin-bottom: 5px; 
  white-space: nowrap; /* Text wrap na ho */
}

.logo {
  color: #a855f7;
  text-align: center;
  margin-bottom: 30px;
  font-weight: bold;
  font-size: 24px;
  position: relative;
  top: -35px;
  
}


.sidebar a.active, .sidebar a:hover { 
  background: linear-gradient(45deg, #7b2ff7, #9f44d3); 
  color: white; 
}

/* Content Wrapper Adjustment */
.content-wrapper { 
  margin-left: 260px; /* Sidebar width ke barabar */
  padding: 40px 20px; 
  display: flex; 
  flex-direction: column; 
  align-items: center; 
}

/* Mobile Menu Button - SIZE & ALIGNMENT FIX */
.menu-btn { 
  display: none; 
  position: fixed; 
  top: 15px; 
  left: 15px; 
  z-index: 1000; 
  background: #6a0dad; 
  color: white; 
  border: none; 
  /* Fixed square size */
  width: 42px; 
  height: 42px; 
  border-radius: 8px; 
  cursor: pointer; 
  font-size: 20px;
  /* Center the icon */
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* Responsive Fixes */
@media (max-width: 768px) {
  .sidebar { 
    width: 200px;
    transform: translateX(-100%); 
    padding-top: 70px; /* Space for the button */
  }
  .sidebar.show { transform: translateX(0); }
  .content-wrapper { 
    margin-left: 0; 
    padding-top: 80px; 
    width: 100%;
  }
  .menu-btn { display: flex; } /* Display flex for centering */
}