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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #e2e8f0;
    background: #0f172a;
}

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

/* Header */
.header {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(20px);
    box-shadow: 0 2px 20px rgba(0,0,0,0.3);
    border-bottom: 1px solid #1e293b;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 0;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    background: linear-gradient(135deg, #3b82f6, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-menu a {
    text-decoration: none;
    color: #cbd5e1;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: #3b82f6;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #1e293b 0%, #0f172a 50%, #1e1b4b 100%);
    position: relative;
    overflow: hidden;
    color: white;
    padding: 120px 0 80px;
    text-align: center;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
            radial-gradient(circle at 20% 80%, rgba(59, 130, 246, 0.15) 0%, transparent 50%),
            radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.15) 0%, transparent 50%);
}

.hero-content {
    position: relative;
    z-index: 1;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    font-weight: 700;
    background: linear-gradient(135deg, #fff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero p {
    font-size: 1.3rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    color: #cbd5e1;
}

.cta-button {
    display: inline-block;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    padding: 15px 30px;
    text-decoration: none;
    border-radius: 50px;
    font-weight: 600;
    font-size: 1.1rem;
    transition: all 0.3s;
    box-shadow: 0 4px 25px rgba(59, 130, 246, 0.4);
    border: 1px solid rgba(59, 130, 246, 0.3);
}

.cta-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 35px rgba(59, 130, 246, 0.6);
    background: linear-gradient(135deg, #1d4ed8, #1e40af);
}

/* Benefits Section */
.benefits {
    padding: 80px 0;
    background: #1e293b;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 3rem;
    color: #f1f5f9;
    background: linear-gradient(135deg, #f1f5f9, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 2rem;
}

.benefit-card {
    background: linear-gradient(135deg, #334155, #475569);
    padding: 2rem;
    border-radius: 15px;
    text-align: center;
    transition: all 0.3s;
    border: 1px solid #475569;
    backdrop-filter: blur(10px);
}

.benefit-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 40px rgba(0,0,0,0.3);
    border-color: #3b82f6;
    background: linear-gradient(135deg, #3b82f6, #1e40af);
}

.benefit-icon {
    width: 60px;
    height: 60px;
    background: linear-gradient(135deg, #3b82f6, #06b6d4);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-size: 1.5rem;
    color: white;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.benefit-card h3 {
    font-size: 1.3rem;
    margin-bottom: 1rem;
    color: #f1f5f9;
}

.benefit-card p {
    color: #cbd5e1;
}

.benefit-card:hover h3,
.benefit-card:hover p {
    color: white;
}

/* About Instructor */
.about {
    padding: 80px 0;
    background: #0f172a;
    position: relative;
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
            radial-gradient(circle at 70% 30%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 2fr;
    gap: 3rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.instructor-photo {
    width: 300px;
    height: 300px;
    background: linear-gradient(135deg, #3b82f6, #8b5cf6);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 4rem;
    margin: 0 auto;
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.3);
    border: 2px solid rgba(59, 130, 246, 0.3);
}

.about-text h2 {
    font-size: 2.2rem;
    margin-bottom: 1.5rem;
    color: #f1f5f9;
}

.about-text p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: #cbd5e1;
}

.about-text ul {
    color: #94a3b8;
}

.about-text li {
    margin-bottom: 0.5rem;
}

/* Materials Section */
.materials {
    padding: 80px 0;
    background: #1e293b;
}

.materials-slider {
    background: linear-gradient(135deg, #334155, #475569);
    border-radius: 15px;
    padding: 2rem;
    margin-top: 2rem;
    border: 1px solid #475569;
}

.slider-content {
    display: none;
    text-align: center;
}

.slider-content.active {
    display: block;
}

.material-preview {
    background: linear-gradient(135deg, #1e293b, #334155);
    padding: 2rem;
    border-radius: 10px;
    margin: 1rem 0;
    box-shadow: 0 4px 20px rgba(0,0,0,0.2);
    border: 1px solid #475569;
}

.material-preview h4 {
    color: #f1f5f9;
    margin-bottom: 1rem;
    font-size: 1.3rem;
}

.material-preview p {
    color: #cbd5e1;
    margin-bottom: 1rem;
}

.material-preview ul {
    color: #94a3b8;
}

.slider-nav {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 2rem;
}

.slider-btn {
    padding: 10px 20px;
    background: #475569;
    border: 1px solid #64748b;
    border-radius: 25px;
    cursor: pointer;
    transition: all 0.3s;
    color: #cbd5e1;
    font-weight: 500;
}

.slider-btn.active {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    border-color: #3b82f6;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.slider-btn:hover:not(.active) {
    background: #64748b;
    border-color: #94a3b8;
}

/* Pricing */
.pricing {
    padding: 80px 0;
    background: linear-gradient(135deg, #0f172a 0%, #1e1b4b 50%, #312e81 100%);
    color: white;
    position: relative;
    overflow: hidden;
}

.pricing::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background:
            radial-gradient(circle at 30% 70%, rgba(59, 130, 246, 0.1) 0%, transparent 50%),
            radial-gradient(circle at 70% 30%, rgba(139, 92, 246, 0.1) 0%, transparent 50%);
}

.pricing-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
    position: relative;
    z-index: 1;
}

.pricing-card {
    background: rgba(30, 41, 59, 0.8);
    backdrop-filter: blur(20px);
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    border: 1px solid rgba(71, 85, 105, 0.5);
    transition: all 0.3s;
}

.pricing-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 20px 60px rgba(0,0,0,0.4);
    border-color: rgba(59, 130, 246, 0.5);
}

.pricing-card.featured {
    transform: scale(1.05);
    background: rgba(59, 130, 246, 0.2);
    border: 2px solid #3b82f6;
    box-shadow: 0 10px 40px rgba(59, 130, 246, 0.3);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-5px);
}

.pricing-card h3 {
    font-size: 1.5rem;
    margin-bottom: 1rem;
    color: #f1f5f9;
}

.price {
    font-size: 3rem;
    font-weight: 700;
    margin: 1rem 0;
    background: linear-gradient(135deg, #3b82f6, #06b6d4);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.pricing-features {
    list-style: none;
    margin: 2rem 0;
}

.pricing-features li {
    padding: 0.5rem 0;
    border-bottom: 1px solid rgba(71, 85, 105, 0.5);
    color: #cbd5e1;
}

/* Contact */
.contact {
    padding: 80px 0;
    background: #1e293b;
}

.contact-form {
    max-width: 600px;
    margin: 0 auto;
    background: linear-gradient(135deg, #334155, #475569);
    padding: 2rem;
    border-radius: 15px;
    border: 1px solid #475569;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 600;
    color: #f1f5f9;
}

.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 12px;
    border: 1px solid #64748b;
    border-radius: 8px;
    font-size: 1rem;
    background: #1e293b;
    color: #e2e8f0;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: #3b82f6;
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.form-group textarea {
    height: 120px;
    resize: vertical;
}

.submit-btn {
    width: 100%;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    padding: 15px;
    border: none;
    border-radius: 8px;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(59, 130, 246, 0.3);
}

.submit-btn:hover {
    background: linear-gradient(135deg, #1d4ed8, #1e40af);
    transform: translateY(-2px);
    box-shadow: 0 6px 25px rgba(59, 130, 246, 0.4);
}

/* Footer */
.footer {
    background: #0f172a;
    color: #94a3b8;
    text-align: center;
    padding: 2rem 0;
    border-top: 1px solid #1e293b;
}

/* Theme Toggle Button */
.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    color: white;
    border: none;
    border-radius: 50%;
    width: 50px;
    height: 50px;
    cursor: pointer;
    font-size: 1.2rem;
    box-shadow: 0 4px 20px rgba(59, 130, 246, 0.4);
    transition: all 0.3s;
    z-index: 1000;
}

.theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 30px rgba(59, 130, 246, 0.6);
}

/* Responsive */
@media (max-width: 768px) {
    .hero h1 {
        font-size: 2.5rem;
    }

    .nav-menu {
        display: none;
    }

    .about-content {
        grid-template-columns: 1fr;
        text-align: center;
    }

    .benefits-grid {
        grid-template-columns: 1fr;
    }

    .pricing-card.featured {
        transform: none;
    }
}

/* Scrollbar styling */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #1e293b;
}

::-webkit-scrollbar-thumb {
    background: linear-gradient(135deg, #3b82f6, #1d4ed8);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: linear-gradient(135deg, #1d4ed8, #1e40af);
}