:root {
    --primary-color: #2563eb;
    --primary-dark: #1d4ed8;
    --secondary-color: #64748b;
    --background-color: #ffffff;
    --text-color: #1e293b;
    --light-gray: #f1f5f9;
    --border-radius: 8px;
    --container-width: 1200px;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    line-height: 1.5;
}

.container {
    max-width: var(--container-width);
    margin: 0 auto;
    padding: 0 2rem;
}

/* Header & Navigation */
.header {
    background-color: var(--background-color);
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
}

.nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

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

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

/* Buttons */
.primary-button, .secondary-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border-radius: var(--border-radius);
    font-weight: 500;
    text-decoration: none;
    transition: all 0.3s ease;
}

.primary-button {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

.primary-button:hover {
    background-color: var(--primary-dark);
    transform: translateY(-1px);
}

.secondary-button {
    background-color: var(--light-gray);
    color: var(--text-color);
}

.secondary-button:hover {
    background-color: #e2e8f0;
}

/* Hero Section */
.hero {
    padding: 160px 0 80px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.hero-content h1 {
    font-size: 3.5rem;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    font-weight: 700;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--secondary-color);
    margin-bottom: 2rem;
}

.cta-group {
    display: flex;
    gap: 1rem;
}

.hero-image {
    position: relative;
}

.phone-mockup {
    width: 100%;
    height: auto;
    border-radius: 24px;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
}

/* Features Section */
.features {
    padding: 80px 0;
    text-align: center;
}

.features h2 {
    font-size: 2.5rem;
    margin-bottom: 3rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 3rem;
}

.feature-card {
    background: var(--background-color);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.feature-card h3 {
    margin-bottom: 1rem;
    font-size: 1.25rem;
}

/* How It Works Section */
.how-it-works {
    background-color: var(--light-gray);
    padding: 80px 0;
}

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

.steps {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

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

.step-number {
    width: 40px;
    height: 40px;
    background-color: var(--primary-color);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1rem;
    font-weight: 600;
}

/* Signup Section */
.signup {
    padding: 80px 0;
}

.signup-card {
    background-color: var(--primary-color);
    color: white;
    padding: 4rem 2rem;
    border-radius: var(--border-radius);
    text-align: center;
}

.signup-card h2 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}

.signup-form {
    display: flex;
    gap: 1rem;
    max-width: 500px;
    margin: 2rem auto 0;
}

.signup-form input {
    flex: 1;
    padding: 0.75rem 1rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
}

/* Footer */
.footer {
    background-color: var(--light-gray);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
}

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

.footer-links a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.footer-links a:hover {
    color: var(--text-color);
}

.footer-bottom {
    text-align: center;
    color: var(--secondary-color);
    padding-top: 2rem;
    border-top: 1px solid #e2e8f0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        grid-template-columns: 1fr;
        text-align: center;
        padding: 120px 0 60px;
    }

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

    .cta-group {
        justify-content: center;
    }

    .nav-links {
        display: none;
    }

    .signup-form {
        flex-direction: column;
    }

    .footer-content {
        flex-direction: column;
        gap: 2rem;
        text-align: center;
    }
}