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

body {
    font-family: 'Libre Franklin', sans-serif;
    background: white;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    color: hsl(209, 33%, 12%);
    line-height: 1.6;
    font-size: 20px;
}

.container {
    max-width: 1440px;
    width: 100%;
    padding: 2rem;
    text-align: center;
    background: white;
}

/* Header */
header {
    margin-bottom: 1.5rem;
}

.logo {
    height: 30px;
    width: auto;
}

/* Main content */
main {
    margin-bottom: 3rem;
}

h1 {
    font-size: 3rem;
    font-weight: 300;
    opacity: 0.7;
    margin-bottom: 1rem;
    color: hsl(209, 33%, 12%);
}

.highlight {
    color: hsl(0, 0%, 0%);
    font-weight: 700;
    opacity: 1;
}
.subtitle {
    font-size: 20px;
    color: hsl(0, 0%, 59%);
    margin-bottom: 2.5rem;
    font-weight: 300;
}

/* Email form */
.email-form {
    max-width: 500px;
    margin: 0 auto;
}

.input-group {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
    position: relative;
}

#emailInput {
    flex: 1;
    padding: 1rem 1.5rem;
    border: 1px solid hsl(223, 100%, 88%);
    border-radius: 50px;
    font-size: 20px;
    outline: none;
    transition: all 0.3s ease;
    background: white;
    opacity: 0.3;
}

#emailInput:focus {
    border-color: hsl(223, 87%, 63%);
    box-shadow: 0 0 0 3px rgba(223, 87%, 63%, 0.1);
}

#emailInput.error {
    border-color: hsl(354, 100%, 66%);
    background-color: white;
}

#submitBtn {
    padding: 1rem 2rem;
    background: hsl(223, 87%, 63%);
    color: white;
    border: none;
    border-radius: 50px;
    font-size: 20px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    white-space: nowrap;
    min-width: 140px;
}

#submitBtn:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(102, 126, 234, 0.3);
}

#submitBtn:active {
    transform: translateY(0);
}

#submitBtn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.error-message {
    color: hsl(354, 100%, 66%);
    font-size: 12px;
    text-align: left;
    margin-left: 1.5rem;
    min-height: 1.25rem;
    opacity: 0;
    transition: opacity 0.3s ease;
    font-style: italic;
}

.error-message.show {
    opacity: 1;
}

/* Illustration */
.illustration {
    margin: 3rem 0;
}

.illustration img {
    max-width: 100%;
    height: auto;
    max-height: 400px;
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

/* Footer */
footer {
    margin-top: 3rem;
    padding-top: 2rem;
    border-top: 1px solid #e2e8f0;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1.5rem;
    margin-bottom: 1.5rem;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    color: hsl(223, 87%, 63%);
    text-decoration: none;
    transition: all 0.3s ease;
    border: 1px solid hsl(223, 100%, 88%);
}

.social-link:hover {
    background: hsl(223, 87%, 63%);
    color: white;
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(223, 87%, 63%, 0.3);
}

.copyright {
    color: hsl(0, 0%, 59%);
    font-size: 12px;
}

/* Responsive design */
@media (max-width: 375px) {
    .container {
        padding: 1.5rem;
        margin: 1rem;
        border-radius: 15px;
    }
    
    h1 {
        font-size: 2.25rem;
    }
    
    .subtitle {
        font-size: 1.125rem;
    }
    
    .input-group {
        flex-direction: column;
        gap: 1rem;
    }
    
    #submitBtn {
        width: 100%;
        min-width: auto;
    }
    
    .illustration img {
        max-height: 300px;
    }
    
    .social-links {
        gap: 1rem;
    }
    
    .social-link {
        width: 35px;
        height: 35px;
    }
}

@media (max-width: 320px) {
    .container {
        padding: 1rem;
        margin: 0.5rem;
    }
    
    h1 {
        font-size: 1.875rem;
    }
    
    .subtitle {
        font-size: 1rem;
    }
    
    #emailInput,
    #submitBtn {
        padding: 0.875rem 1.25rem;
        font-size: 0.875rem;
    }
    
    .illustration img {
        max-height: 250px;
    }
}

/* Loading animation */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Success state */
.success {
    background: hsl(223, 87%, 63%) !important;
}

/* Error state */
.error {
    background: hsl(354, 100%, 66%) !important;
}