/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Roboto', 'Oxygen', 'Ubuntu', 'Cantarell', sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f8f9fa;
}

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

/* Screen reader only text */
.sr-only {
    position: absolute;
    width: 1px;
    height: 1px;
    padding: 0;
    margin: -1px;
    overflow: hidden;
    clip: rect(0, 0, 0, 0);
    white-space: nowrap;
    border: 0;
}

/* Header */
.header {
    background: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: #2c3e50;
    padding: 1rem 0;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    font-size: 2rem;
}

/* Hero Section */
.hero {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0 2rem 0;
    min-height: 100vh;
    display: flex;
    align-items: center;
    text-align: center;
}

.hero-content {
    max-width: 600px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 1rem;
    line-height: 1.2;
}

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

/* Signup Form */
.signup-form {
    max-width: 500px;
    margin: 0 auto;
}

.form-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.email-input {
    flex: 1;
    padding: 1rem;
    font-size: 1rem;
    border: 2px solid rgba(255,255,255,0.3);
    border-radius: 8px;
    background: rgba(255,255,255,0.1);
    color: white;
    transition: all 0.3s ease;
}

.email-input::placeholder {
    color: rgba(255,255,255,0.7);
}

.email-input:focus {
    outline: none;
    border-color: rgba(255,255,255,0.8);
    background: rgba(255,255,255,0.2);
}

.email-input.error {
    border-color: #e74c3c;
    background: rgba(231,76,60,0.1);
}

.cta-button {
    background: #27ae60;
    color: white;
    border: none;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
}

.cta-button:hover:not(:disabled) {
    background: #229954;
    transform: translateY(-2px);
}

.cta-button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.error-message {
    color: white;
    background: #e74c3c;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    margin-top: 1rem;
    border: none;
}

.success-message {
    color: white;
    background: #27ae60;
    padding: 1rem 2rem;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    text-align: center;
    margin-top: 1rem;
    border: none;
}

/* Features Section */
.features {
    padding: 1rem 0 2rem 0;
}

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

.feature-card {
    text-align: center;
    padding: 1rem;
    border-radius: 8px;
    background: rgba(255,255,255,0.1);
    border: 1px solid rgba(255,255,255,0.2);
    transition: all 0.3s ease;
    color: white;
}

.feature-card:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-2px);
}

.feature-card h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: white;
}

.feature-card p {
    color: rgba(255,255,255,0.9);
    line-height: 1.4;
    font-size: 0.9rem;
}

/* Footer */
.footer {
    background: #2c3e50;
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 4rem;
}

.footer p {
    opacity: 0.8;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero {
        padding: 1rem 0 1rem 0;
        min-height: 100vh;
    }
    
    .hero-title {
        font-size: 2rem;
        margin-bottom: 0.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
        margin-bottom: 1.5rem;
    }
    
    .form-group {
        flex-direction: column;
    }
    
    .cta-button {
        width: 100%;
        padding: 1rem;
    }
    
    .features {
        padding: 1rem 0 0 0;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 0.5rem;
    }
    
    .feature-card {
        padding: 0.75rem;
    }
    
    .feature-card h3 {
        font-size: 1rem;
        margin-bottom: 0.25rem;
    }
    
    .feature-card p {
        font-size: 0.85rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 15px;
    }
    
    .hero {
        padding: 1rem 0 1rem 0;
        min-height: 100vh;
    }
    
    .hero-title {
        font-size: 1.75rem;
        margin-bottom: 0.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
        margin-bottom: 1rem;
    }
    
    .features {
        padding: 1rem 0 0 0;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 0.5rem;
    }
    
    .feature-card {
        padding: 0.5rem;
    }
    
    .feature-card h3 {
        font-size: 0.9rem;
        margin-bottom: 0.25rem;
    }
    
    .feature-card p {
        font-size: 0.8rem;
        line-height: 1.3;
    }
    
    .logo {
        font-size: 1.25rem;
    }
    
    .logo-icon {
        font-size: 1.5rem;
    }
}

/* High contrast mode support */
@media (prefers-contrast: high) {
    .hero {
        background: #000;
    }
    
    .feature-card {
        border: 2px solid #333;
    }
    
    .email-input {
        border: 2px solid #fff;
    }
}

/* Reduced motion support */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for accessibility */
*:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}

button:focus,
input:focus {
    outline: 2px solid #667eea;
    outline-offset: 2px;
}