:root {
    --primary-color: #2563eb;
    --primary-hover: #1d4ed8;
    --bg-color: #ffffff;
    --text-main: #111827;
    --text-muted: #4b5563;
    --border-color: #e5e7eb;
    --card-bg: #ffffff;
    --section-bg: #f9fafb;
    --gradient-start: #eff6ff;
    --gradient-end: #ffffff;
    --transition-speed: 0.3s;
}

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

html {
    scroll-behavior: smooth;
    font-family: 'Inter', sans-serif;
    color: var(--text-main);
}

body {
    background-color: var(--bg-color);
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navbar */
.navbar {
    border-bottom: 1px solid var(--border-color);
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1.25rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

.logo {
    color: var(--primary-color);
    font-size: 1.5rem;
    font-weight: 700;
    text-decoration: none;
}

.nav-links {
    display: flex;
    gap: 1.5rem;
}

.nav-link {
    color: var(--text-main);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 500;
    transition: color var(--transition-speed);
}

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

/* Hero Section */
.hero {
    position: relative;
    padding: 8rem 2rem;
    text-align: center;
    background: linear-gradient(180deg, var(--gradient-start) 0%, var(--gradient-end) 100%);
    overflow: hidden;
}

.hero-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-main);
    animation: fadeUp 0.8s ease-out forwards;
}

.highlight {
    background: linear-gradient(135deg, var(--primary-color), #60a5fa);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-muted);
    margin-bottom: 2.5rem;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
    animation: fadeUp 0.8s ease-out 0.2s forwards;
    opacity: 0;
}

.hero-form {
    display: flex;
    justify-content: center;
    gap: 0.75rem;
    animation: fadeUp 0.8s ease-out 0.4s forwards;
    opacity: 0;
}

.email-input {
    padding: 0.75rem 1.25rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 0.5rem;
    width: 100%;
    max-width: 300px;
    outline: none;
    transition: border-color var(--transition-speed), box-shadow var(--transition-speed);
    font-family: inherit;
}

.email-input:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.2);
}

.primary-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 0.5rem;
    cursor: pointer;
    transition: background-color var(--transition-speed), transform var(--transition-speed);
    font-family: inherit;
}

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

.primary-btn:active {
    transform: translateY(0);
}

.primary-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
    transform: none;
}

.form-message {
    margin-top: 1rem;
    font-size: 0.95rem;
    min-height: 1.5em;
    font-weight: 500;
}

/* Features */
.features {
    padding: 6rem 0;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 4rem;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2.5rem;
}

.feature-card {
    background-color: var(--card-bg);
    border: 1px solid var(--border-color);
    border-radius: 1rem;
    padding: 2.5rem 2rem;
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: 1.25rem;
    display: inline-block;
    padding: 1rem;
    background-color: #f3f4f6;
    border-radius: 1rem;
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary-color);
    margin-bottom: 0.75rem;
}

.feature-desc {
    color: var(--text-muted);
    font-size: 1.05rem;
}

/* How it works */
.how-it-works {
    background-color: var(--section-bg);
    padding: 6rem 0;
}

.steps-container {
    max-width: 800px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.step {
    display: flex;
    align-items: center;
    background: var(--card-bg);
    padding: 1.5rem 2rem;
    border-radius: 1rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
    border: 1px solid var(--border-color);
    transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.step:hover {
    transform: translateX(10px);
    box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
}

.step-number {
    background: linear-gradient(135deg, var(--primary-color), #60a5fa);
    color: white;
    width: 3rem;
    height: 3rem;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 50%;
    font-weight: 700;
    font-size: 1.2rem;
    margin-right: 1.5rem;
    flex-shrink: 0;
    box-shadow: 0 4px 6px -1px rgba(37, 99, 235, 0.3);
}

.step-text {
    font-size: 1.15rem;
    font-weight: 500;
    color: var(--text-main);
}

/* Footer */
.footer {
    padding: 3rem 0;
    text-align: center;
    color: var(--text-muted);
    background-color: var(--bg-color);
    border-top: 1px solid var(--border-color);
    font-size: 0.95rem;
}

/* Animations */
@keyframes fadeUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Responsive */
@media (max-width: 768px) {
    .hero {
        padding: 5rem 1.5rem;
    }
    .hero-title {
        font-size: 2.5rem;
    }
    .hero-form {
        flex-direction: column;
        align-items: center;
    }
    .email-input {
        max-width: 100%;
    }
    .primary-btn {
        width: 100%;
    }
    .nav-links {
        display: none;
    }
    .step {
        padding: 1.25rem;
    }
    .step-text {
        font-size: 1rem;
    }
}