* { margin: 0; padding: 0; box-sizing: border-box; }

body { font-family: 'Poppins', sans-serif; line-height: 1.6; color: var(--dark); background-color: #f9f9f9; }

h1, h2, h3, h4, h5 { font-family: 'Roboto Slab', serif; font-weight: 600; line-height: 1.3; }

.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Header Styles */ header { background-color: white; box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08); position: sticky; top: 0; z-index: 1000; }

.header-content { display: flex; justify-content: space-between; align-items: center; padding: 15px 0; }

.logo { display: flex; align-items: center; gap: 10px; text-decoration: none; }

.logo-icon { width: 50px; height: 50px; background-color: var(--primary); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: white; font-size: 1.8rem; }

.logo-text { font-size: 1.8rem; font-weight: 700; color: var(--primary); }

.logo-text span { color: var(--secondary); }

nav ul { display: flex; list-style: none; gap: 30px; }

nav a { color: var(--dark); text-decoration: none; font-weight: 500; font-size: 1.1rem; transition: color 0.3s; position: relative; padding: 5px 0; }

nav a:hover { color: var(--primary); }

nav a.active { color: var(--primary); font-weight: 600; }

nav a.active::after { content: ''; position: absolute; width: 100%; height: 3px; background: var(--primary); left: 0; bottom: -5px; border-radius: 2px; }

.header-actions { display: flex; gap: 15px; align-items: center; }

.btn { padding: 10px 25px; border-radius: 8px; font-weight: 600; text-decoration: none; display: inline-block; transition: all 0.3s; border: none; cursor: pointer; font-family: 'Poppins', sans-serif; }

.btn-primary { background-color: var(--primary); color: white; }

.btn-primary:hover { background-color: var(--secondary); transform: translateY(-3px); box-shadow: 0 6px 12px rgba(67, 97, 238, 0.2); }

.btn-outline { background-color: transparent; color: var(--primary); border: 2px solid var(--primary); }

.btn-outline:hover { background-color: var(--primary); color: white; transform: translateY(-3px); }

.mobile-toggle { display: none; font-size: 1.5rem; cursor: pointer; color: var(--dark); }

/* Hero Section */ .hero { background: linear-gradient(135deg, rgba(67, 97, 238, 0.05) 0%, rgba(74, 144, 226, 0.05) 100%); padding: 100px 0; position: relative; overflow: hidden; }

.hero-content { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }

.hero-text h1 { font-size: 3.2rem; margin-bottom: 20px; color: var(--dark); }

.hero-text h1 span { color: var(--primary); }

.hero-text p { font-size: 1.2rem; color: var(--gray); margin-bottom: 30px; max-width: 500px; }

.hero-stats { display: flex; gap: 40px; margin-top: 40px; }

.stat-item { text-align: center; }

.stat-number { font-size: 2.5rem; font-weight: 700; color: var(--primary); display: block; line-height: 1; }

.stat-label { font-size: 1rem; color: var(--gray); font-weight: 500; }

.hero-image { position: relative; }

.hero-img { max-width: 100%; border-radius: 15px; box-shadow: 0 20px 40px rgba(0, 0, 0, 0.1); }

.floating-icon { position: absolute; width: 70px; height: 70px; background-color: white; border-radius: 50%; display: flex; align-items: center; justify-content: center; box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1); color: var(--primary); font-size: 1.8rem; z-index: 10; }

.icon-1 { top: -20px; left: -20px; }

.icon-2 { bottom: 30px; right: -20px; background-color: var(--warning); color: white; }

/* Subjects Section */ .section-title { text-align: center; margin-bottom: 50px; }

.section-title h2 { font-size: 2.5rem; color: var(--dark); margin-bottom: 15px; }

.section-title p { color: var(--gray); max-width: 600px; margin: 0 auto; font-size: 1.1rem; }

.subjects { padding: 80px 0; background-color: white; }

.subject-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 30px; }

.subject-card { background-color: white; border-radius: 12px; padding: 30px; box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05); transition: all 0.3s; text-align: center; border: 2px solid transparent; }

.subject-card:hover { transform: translateY(-10px); box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1); border-color: var(--primary); }

.subject-icon { width: 70px; height: 70px; background-color: var(--light-blue); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 25px; color: var(--primary); font-size: 1.8rem; }

.subject-card h3 { font-size: 1.5rem; margin-bottom: 15px; color: var(--dark); }

.subject-card p { color: var(--gray); margin-bottom: 20px; }

/* Study Materials */ .materials { padding: 80px 0; background-color: var(--light); }

.material-filters { display: flex; justify-content: center; flex-wrap: wrap; gap: 15px; margin-bottom: 40px; }

.filter-btn { padding: 10px 25px; background-color: white; border: 2px solid #ddd; border-radius: 30px; font-weight: 500; cursor: pointer; transition: all 0.3s; }

.filter-btn.active, .filter-btn:hover { background-color: var(--primary); color: white; border-color: var(--primary); }

.material-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr)); gap: 30px; }

.material-card { background-color: white; border-radius: 12px; overflow: hidden; box-shadow: 0 10px 25px rgba(0, 0, 0, 0.05); transition: all 0.3s; }

.material-card:hover { transform: translateY(-10px); box-shadow: 0 15px 35px rgba(0, 0, 0, 0.1); }

.material-header { padding: 25px 25px 15px; border-bottom: 1px solid #eee; }

.material-category { display: inline-block; padding: 6px 15px; background-color: var(--light-blue); color: var(--primary); border-radius: 20px; font-size: 0.85rem; font-weight: 600; margin-bottom: 15px; }

.material-card h3 { font-size: 1.4rem; margin-bottom: 10px; color: var(--dark); }

.material-card p { color: var(--gray); font-size: 0.95rem; }

.material-body { padding: 20px 25px; }

.material-info { display: flex; justify-content: space-between; margin-bottom: 20px; color: var(--gray); font-size: 0.9rem; }

.material-footer { padding: 20px 25px; border-top: 1px solid #eee; display: flex; justify-content: space-between; align-items: center; }

.material-author { display: flex; align-items: center; gap: 10px; }

.author-avatar { width: 35px; height: 35px; border-radius: 50%; object-fit: cover; }

.material-download { color: var(--primary); text-decoration: none; font-weight: 600; display: flex; align-items: center; gap: 8px; transition: gap 0.3s; }

.material-download:hover { gap: 12px; }

/* Features Section */ .features { padding: 80px 0; background-color: white; }

.feature-cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(350px, 1fr)); gap: 30px; }

.feature-card { display: flex; gap: 20px; padding: 30px; background-color: var(--light); border-radius: 12px; transition: all 0.3s; }

.feature-card:hover { background-color: var(--light-blue); transform: translateY(-5px); }

.feature-icon { width: 70px; height: 70px; background-color: var(--primary); border-radius: 12px; display: flex; align-items: center; justify-content: center; color: white; font-size: 1.8rem; flex-shrink: 0; }

.feature-content h3 { font-size: 1.4rem; margin-bottom: 10px; color: var(--dark); }

.feature-content p { color: var(--gray); }

/* CTA Section */ .cta { padding: 100px 0; background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%); color: white; text-align: center; }

.cta h2 { font-size: 2.8rem; margin-bottom: 20px; }

.cta p { font-size: 1.2rem; max-width: 700px; margin: 0 auto 40px; opacity: 0.9; }

.cta .btn { background-color: white; color: var(--primary); font-size: 1.1rem; padding: 15px 40px; }

.cta .btn:hover { background-color: var(--light); transform: translateY(-3px); box-shadow: 0 10px 25px rgba(0, 0, 0, 0.2); }

/* Footer */ footer { background-color: var(--dark); color: white; padding: 70px 0 30px; }

.footer-content { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 40px; margin-bottom: 50px; }

.footer-logo { font-size: 1.8rem; font-weight: 700; margin-bottom: 20px; color: white; }

.footer-logo span { color: var(--accent); }

.footer-about p { color: #bbb; margin-bottom: 25px; }

.social-links { display: flex; gap: 15px; }

.social-links a { display: inline-flex; align-items: center; justify-content: center; width: 45px; height: 45px; background-color: rgba(255, 255, 255, 0.1); color: white; border-radius: 50%; text-decoration: none; transition: all 0.3s; }

.social-links a:hover { background-color: var(--primary); transform: translateY(-3px); }

.footer-section h3 { font-size: 1.3rem; margin-bottom: 25px; color: white; }

.footer-links ul { list-style: none; }

.footer-links ul li { margin-bottom: 12px; }

.footer-links ul li a { color: #bbb; text-decoration: none; transition: color 0.3s; }

.footer-links ul li a:hover { color: var(--accent); }

.copyright { text-align: center; padding-top: 30px; border-top: 1px solid rgba(255, 255, 255, 0.1); color: #999; font-size: 0.9rem; }

/* Responsive Design */ @media (max-width: 992px) { .hero-content { grid-template-columns: 1fr; text-align: center; }

.hero-text p { margin: 0 auto 30px; }

.hero-stats { justify-content: center; } }

@media (max-width: 768px) { nav ul { display: none; position: absolute; top: 100%; left: 0; width: 100%; background-color: white; flex-direction: column; padding: 20px; box-shadow: 0 10px 15px rgba(0, 0, 0, 0.1); }

nav ul.active { display: flex; }

.mobile-toggle { display: block; }

.header-actions { display: none; }

.hero-text h1 { font-size: 2.5rem; }

.section-title h2 { font-size: 2rem; }

.feature-cards { grid-template-columns: 1fr; } }

@media (max-width: 576px) { .hero-text h1 { font-size: 2rem; }

.hero-stats { flex-direction: column; gap: 20px; }

.subject-cards, .material-cards { grid-template-columns: 1fr; }

.footer-content { grid-template-columns: 1fr; } }

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Derivatives, integrals, limits, and applications with solved examples.

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Comprehensive guide covering all calculus concepts with step-by-step explanations.

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Quantum mechanics, relativity, and nuclear physics simplified.

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15 video lectures explaining complex modern physics concepts with animations.

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