:root {
    --primary-color: #1a237e;
    --secondary-color: #0d47a1;
    --accent-color: #2196f3;
    --text-color: #212121;
    --text-light: #757575;
    --background-light: #f5f7fa;
    --white: #ffffff;
    --shadow-sm: 0 2px 4px rgba(0,0,0,0.1);
    --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
    --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
    --gradient: linear-gradient(135deg, var(--primary-color), var(--accent-color));
}

/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--white);
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    line-height: 1.2;
    margin-bottom: 1rem;
}

h1 {
    font-size: 3.5rem;
    letter-spacing: -0.02em;
}

h2 {
    font-size: 2.5rem;
    text-align: center;
    margin-bottom: 3rem;
}

h3 {
    font-size: 1.75rem;
}

p {
    margin-bottom: 1rem;
}

/* Navigation */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow-sm);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    padding: 1rem 0;
    transition: all 0.3s ease;
}

    .navbar.scrolled {
        background-color: var(--white);
        padding: 0.5rem 0;
    }

.nav-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    color: var(--primary-color);
    font-size: 1.75rem;
    font-weight: 700;
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

    .nav-links a {
        color: var(--text-color);
        text-decoration: none;
        font-weight: 500;
        transition: color 0.3s ease;
        position: relative;
    }

        .nav-links a::after {
            content: '';
            position: absolute;
            bottom: -4px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: var(--accent-color);
            transition: width 0.3s ease;
        }

        .nav-links a:hover::after {
            width: 100%;
        }

/* Hero Section */
.hero {
    background: var(--gradient);
    padding: 10rem 2rem 6rem;
    position: relative;
    overflow: hidden;
}

    .hero::before {
        content: '';
        position: absolute;
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        background: url('/images/pattern.svg') center/cover;
        opacity: 0.1;
    }

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
    color: var(--white);
    position: relative;
    z-index: 1;
}

.hero p {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Buttons */
.cta-button, .download-button {
    display: inline-block;
    padding: 1rem 2.5rem;
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    color: var(--primary-color);
    background-color: var(--white);
    border-radius: 50px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}

    .cta-button:hover, .download-button:hover {
        transform: translateY(-2px);
        box-shadow: var(--shadow-lg);
    }

/* Features Section */
.features {
    padding: 6rem 2rem;
    background-color: var(--background-light);
}

.feature-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2.5rem;
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: 20px;
    text-align: center;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-sm);
}

    .feature-card:hover {
        transform: translateY(-5px);
        box-shadow: var(--shadow-lg);
    }

    .feature-card img {
        width: 80px;
        height: 80px;
        margin-bottom: 1.5rem;
    }

/* How It Works Section */
.how-it-works {
    padding: 6rem 2rem;
}

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 3rem;
    max-width: 1200px;
    margin: 0 auto;
}

.step {
    text-align: center;
    padding: 2rem;
    position: relative;
}

.step-number {
    background: var(--gradient);
    color: var(--white);
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: 600;
    margin: 0 auto 1.5rem;
}

/* Download Section */
.download {
    background-color: var(--background-light);
    padding: 6rem 2rem;
}

.download-card {
    background: var(--white);
    max-width: 600px;
    margin: 0 auto;
    padding: 3rem;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
}

    .download-card ul {
        list-style: none;
        margin: 1.5rem 0;
    }

    .download-card li {
        padding: 0.5rem 0;
        display: flex;
        align-items: center;
        gap: 0.5rem;
    }

        .download-card li::before {
            content: '✓';
            color: var(--accent-color);
            font-weight: bold;
        }

/* Footer */
.footer {
    background-color: var(--primary-color);
    color: var(--white);
    padding: 4rem 2rem 2rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 3rem;
}

.footer-section h4 {
    color: var(--white);
    margin-bottom: 1.5rem;
}

.footer a {
    color: var(--white);
    text-decoration: none;
    opacity: 0.8;
    transition: opacity 0.3s ease;
    display: block;
    margin-bottom: 0.75rem;
}

    .footer a:hover {
        opacity: 1;
    }

.social-links {
    display: flex;
    gap: 1rem;
}

.copyright {
    text-align: center;
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid rgba(255,255,255,0.1);
    opacity: 0.8;
}

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

    h2 {
        font-size: 2rem;
    }

    .nav-content {
        flex-direction: column;
        gap: 1rem;
    }

    .nav-links {
        flex-direction: column;
        text-align: center;
        gap: 1rem;
    }
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.feature-card, .step, .download-card {
    animation: fadeIn 0.6s ease-out forwards;
}