:root {
    --primary: #FF5100;
    /* Vibrant Orange/Red */
    --primary-hover: #E04600;
    --dark: #0A0A0A;
    --darker: #050505;
    --light: #F4F4F4;
    --white: #FFFFFF;
    --gray: #888888;
    --card-bg: #141414;
    --border: #222222;
    --font-main: 'Outfit', sans-serif;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-main);
    background-color: var(--dark);
    color: var(--light);
    line-height: 1.6;
    overflow-x: hidden;
}

/* Typography */
h1,
h2,
h3,
h4 {
    color: var(--white);
    line-height: 1.2;
}

/* Utility Classes */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

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

.section {
    padding: 100px 0;
}

.bg-dark {
    background-color: var(--darker);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 28px;
    border-radius: 8px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    cursor: pointer;
    font-size: 1rem;
    border: 2px solid transparent;
}

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

.btn-primary:hover {
    background-color: var(--primary-hover);
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(255, 81, 0, 0.3);
}

.btn-outline {
    background-color: transparent;
    border-color: var(--white);
    color: var(--white);
}

.btn-outline:hover {
    background-color: var(--white);
    color: var(--dark);
    transform: translateY(-2px);
}

.btn-large {
    padding: 16px 36px;
    font-size: 1.125rem;
}

.btn-full {
    width: 100%;
}

/* Header */
.header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 100;
    padding: 20px 0;
    transition: var(--transition);
}

.header.scrolled {
    background-color: rgba(10, 10, 10, 0.95);
    backdrop-filter: blur(10px);
    padding: 12px 0;
    border-bottom: 1px solid var(--border);
}

.header-inner {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.5rem;
    font-weight: 800;
    color: var(--white);
    letter-spacing: 1px;
}

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

.nav {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav a:not(.btn) {
    color: var(--light);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
}

.nav a:not(.btn):hover {
    color: var(--primary);
}

/* Hero Section */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 80px;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(10, 10, 10, 0.9) 0%, rgba(10, 10, 10, 0.3) 100%), url('https://images.unsplash.com/photo-1534158914592-062992fbe900?ixlib=rb-4.0.3&auto=format&fit=crop&w=1920&q=80') center/cover no-repeat;
    z-index: 1;
    transform: scale(1.05);
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5.5rem);
    font-weight: 800;
    margin-bottom: 24px;
    letter-spacing: -2px;
}

.hero-subtitle {
    font-size: clamp(1.125rem, 2vw, 1.5rem);
    color: var(--gray);
    margin-bottom: 40px;
    max-width: 600px;
}

.hero-actions {
    display: flex;
    gap: 16px;
    flex-wrap: wrap;
}

/* Section Title */
.section-title {
    margin-bottom: 64px;
}

.section-title h2 {
    font-size: clamp(2rem, 4vw, 3rem);
    margin-bottom: 16px;
}

.section-title p {
    font-size: 1.125rem;
    color: var(--gray);
}

/* Features Grid */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 32px;
}

.feature-card {
    background-color: var(--card-bg);
    padding: 40px 32px;
    border-radius: 16px;
    border: 1px solid var(--border);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: 24px;
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: 16px;
}

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

/* Courses Section */
.courses-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 32px;
    align-items: center;
}

.course-card {
    background-color: var(--card-bg);
    padding: 48px 32px;
    border-radius: 24px;
    border: 1px solid var(--border);
    position: relative;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    height: 100%;
}

.course-card.popular {
    background-color: #1a1a1a;
    border-color: var(--primary);
    transform: scale(1.05);
    box-shadow: 0 20px 40px rgba(0, 0, 0, 0.6);
    z-index: 2;
}

.course-card:not(.popular):hover {
    transform: translateY(-5px);
}

.popular-badge {
    position: absolute;
    top: -16px;
    left: 50%;
    transform: translateX(-50%);
    background-color: var(--primary);
    color: var(--white);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
}

.course-level {
    color: var(--primary);
    font-weight: 600;
    margin-bottom: 8px;
    font-size: 0.875rem;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.course-card h3 {
    font-size: 2rem;
    margin-bottom: 16px;
}

.course-desc {
    color: var(--gray);
    margin-bottom: 32px;
    min-height: 72px;
}

.course-features {
    list-style: none;
    margin-bottom: 40px;
    flex-grow: 1;
}

.course-features li {
    margin-bottom: 12px;
    color: var(--light);
}

.course-price {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--white);
    margin-bottom: 32px;
}

.course-price span {
    font-size: 1rem;
    font-weight: 400;
    color: var(--gray);
}

/* Contact Section */
.contact-wrapper {
    background-color: var(--card-bg);
    border-radius: 24px;
    border: 1px solid var(--border);
    display: flex;
    justify-content: center;
    text-align: center;
    overflow: hidden;
}

.contact-info {
    padding: 64px;
    width: 100%;
    background: linear-gradient(135deg, rgba(255, 81, 0, 0.1) 0%, rgba(10, 10, 10, 0) 100%);
}

.contact-info h2 {
    font-size: 2.5rem;
    margin-bottom: 24px;
}

.contact-info p {
    color: var(--gray);
    margin-bottom: 40px;
    font-size: 1.125rem;
}

.contact-details {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 24px;
}

.contact-details p {
    margin-bottom: 0;
    font-size: 1.125rem;
    color: var(--light);
    background-color: rgba(255, 255, 255, 0.05);
    padding: 12px 24px;
    border-radius: 8px;
    border: 1px solid var(--border);
}

/* Footer */
.footer {
    padding: 40px 0;
    border-top: 1px solid var(--border);
    background-color: var(--darker);
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

/* Animations */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease-out, transform 0.8s ease-out;
}

.fade-in.appear {
    opacity: 1;
    transform: translateY(0);
}

/* Responsive */
@media (max-width: 992px) {
    .course-card.popular {
        transform: none;
    }

    .contact-info {
        padding: 40px 32px;
    }
}

@media (max-width: 768px) {
    .nav {
        display: none;
    }

    .hero-title {
        font-size: 2.5rem;
    }

    .hero-actions {
        flex-direction: column;
    }

    .btn {
        width: 100%;
    }

    .footer-content {
        flex-direction: column;
        gap: 20px;
        text-align: center;
    }
}