:root {
    --primary: #FFD700; /* Gold/Yellow */
    --secondary: #007BFF; /* Electric Blue */
    --accent: #FF4500; /* Orange Red */
    --dark: #1A1A1B;
    --light: #F4F4F4;
    --text-dark: #333;
    --white: #FFFFFF;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: 'Roboto', sans-serif; line-height: 1.6; color: var(--text-dark); background: var(--light); overflow-x: hidden; }

header { background: var(--dark); color: white; padding: 1rem 5%; position: fixed; width: 100%; top: 0; z-index: 1000; box-shadow: 0 2px 10px rgba(0,0,0,0.3); }
nav { display: flex; justify-content: space-between; align-items: center; }
.logo { font-size: 1.5rem; font-weight: 900; }
.logo span { color: var(--primary); }
.nav-links { display: flex; list-style: none; align-items: center; }
.nav-links li { margin-left: 2rem; }
.nav-links a { text-decoration: none; color: white; font-weight: 500; }
.btn-nav { background: var(--secondary); padding: 0.5rem 1.2rem; border-radius: 5px; color: white !important; }

.hero { height: 100vh; background: linear-gradient(135deg, var(--dark) 0%, #2c3e50 100%); display: flex; align-items: center; justify-content: space-between; padding: 0 10%; color: white; padding-top: 80px; }
.hero-content h1 { font-size: 4rem; line-height: 1.1; margin-bottom: 1rem; font-family: 'Montserrat'; }
.highlight { color: var(--primary); text-shadow: 0 0 20px rgba(255, 215, 0, 0.5); }
.hero-btns a { padding: 1rem 2rem; text-decoration: none; font-weight: 900; border-radius: 5px; display: inline-block; }
.btn-primary { background: var(--primary); color: var(--dark); margin-right: 1rem; transition: 0.3s; }
.btn-primary:hover { transform: scale(1.05); }
.btn-secondary { border: 2px solid white; color: white; }

.hero-visual { width: 300px; height: 300px; position: relative; }
.bolt-animation { width: 80px; height: 80px; background: var(--primary); clip-path: polygon(40% 0%, 0% 50%, 40% 50%, 10% 100%, 60% 50%, 30% 50%); animation: flicker 2s infinite; }
@keyframes flicker { 0%, 10%, 100% { opacity: 1; transform: scale(1); } 5%, 9% { opacity: 0.4; transform: scale(1.1); } }

.features { padding: 5rem 10%; display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 2rem; }
.feature-card { background: white; padding: 2.5rem; border-radius: 15px; text-align: center; box-shadow: 0 10px 30px rgba(0,0,0,0.1); border-bottom: 5px solid var(--secondary); }
.feature-card .icon { font-size: 3rem; margin-bottom: 1rem; }

.lesson-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 2rem; padding: 5rem 10%; }
.lesson-card { background: white; border-radius: 10px; overflow: hidden; box-shadow: 0 5px 15px rgba(0,0,0,0.1); cursor: pointer; border-bottom: 4px solid var(--primary); transition: 0.3s; }
.lesson-card:hover { transform: scale(1.03); }
.lesson-img { height: 150px; background: var(--secondary); color: white; font-size: 3rem; display: flex; align-items: center; justify-content: center; }
.lesson-info { padding: 1.5rem; }

footer { background: var(--dark); color: white; text-align: center; padding: 2rem; }