:root {
    --primary-color: #5c9ded;
    --secondary-color: #6c757d;
    --bg-color: #f8f9fa;
    --text-color: #333;
    --card-bg: #fff;
    --border-color: #dee2e6;
    --success-color: #28a745;
    --error-color: #dc3545;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    line-height: 1.5;
    margin: 0;
    padding: 15px;
    box-sizing: border-box;
}

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 1rem;
    box-sizing: border-box;
}

header, .current-index, .form-section {
    text-align: center;
    margin-bottom: 1.5rem;
}

h1 {
    font-size: 1.75rem;
    color: var(--text-color);
    margin-bottom: 0.25rem;
}

h2 {
    font-size: 1.1rem;
    color: var(--secondary-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.4rem;
    margin-bottom: 0.8rem;
}

/* Main index display - mobile first approach */
#index-display {
    display: flex;
    flex-direction: column; /* Default to vertical layout */
    align-items: center;
    background-color: #fff;
    padding: 1rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
    transition: transform 0.2s, box-shadow 0.2s;
    gap: 1rem;
    box-sizing: border-box;
    width: 100%; /* Full width on all screens */
}

.main-score-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    width: 100%; /* Full width */
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
    box-sizing: border-box;
}

.index-details {
    display: flex;
    flex-direction: column;
    align-items: center; /* Center align by default */
    width: 100%; /* Full width */
    padding-top: 1rem;
    box-sizing: border-box;
}

#index-value {
    font-size: 2.8rem;
    font-weight: bold;
    color: var(--primary-color);
    word-break: break-all;
}

#index-classification {
    font-size: 1.5rem;
    text-transform: uppercase;
    font-weight: bold;
    color: var(--secondary-color);
    word-wrap: break-word;
    text-align: center;
}

.index-details p {
    font-size: 0.9rem;
    margin-bottom: 0.4rem;
    line-height: 1.3;
    color: var(--text-color);
    overflow-wrap: break-word;
    text-align: center;
}

.index-details p:last-child {
    margin-bottom: 0;
}

/* Horizontal layout for desktop */
@media (min-width: 600px) {
    #index-display {
        flex-direction: row; /* Horizontal layout on larger screens */
        align-items: flex-start;
    }
    
    .main-score-display {
        width: auto; /* Auto width on desktop */
        border-right: 1px solid var(--border-color);
        border-bottom: none;
        padding-right: 1rem;
        padding-bottom: 0;
    }
    
    .index-details {
        width: auto; /* Auto width on desktop */
        align-items: flex-start; /* Left align on desktop */
        text-align: left;
        padding-top: 0;
        padding-left: 1rem;
    }
    
    .index-details p {
        text-align: left; /* Left align on desktop */
    }
}

#index-link {
    text-decoration: none;
}

#index-link:hover #index-display {
    transform: scale(1.02);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
}

/* Form styles */
.form-section {
    text-align: center;
}

#subscribe-form, #unsubscribe-form {
    max-width: 100%;
    margin: 0 auto;
    text-align: left;
}

.form-group {
    margin-bottom: 0.75rem;
}

label {
    display: block;
    margin-bottom: 0.25rem;
    font-weight: bold;
}

input[type="email"],
input[type="number"] {
    width: 100%;
    padding: 0.6rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    box-sizing: border-box;
    font-size: 1rem;
}

input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(92, 157, 237, 0.25);
}

.form-hint {
    font-size: 0.85rem;
    color: var(--secondary-color);
    text-align: center;
    margin-top: -0.25rem;
    margin-bottom: 0.75rem;
}

button {
    display: block;
    width: 100%;
    padding: 0.65rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.2s;
    box-sizing: border-box;
}

button:hover {
    background-color: #4a8ad9;
}

/* Footer */
footer {
    margin-top: 2.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--secondary-color);
}

.footer-links {
    font-size: 0.9rem;
    margin-bottom: 0.75rem;
}

.footer-links span,
.footer-links a {
    margin: 0 8px;
}

.disclaimer {
    font-size: 0.8rem;
    font-style: italic;
    max-width: 500px;
    margin: 0 auto;
}

/* Status messages */
#status-message {
    padding: 0.8rem;
    border-radius: 4px;
    display: none;
    font-weight: bold;
    margin-bottom: 1.5rem;
    text-align: center;
    box-sizing: border-box;
}

#status-message.success {
    background-color: #d4edda;
    color: #155724;
    display: block;
}

#status-message.error {
    background-color: #f8d7da;
    color: #721c24;
    display: block;
}

/* Source link */
.source-link {
    font-size: 0.8rem;
    color: var(--secondary-color);
    text-align: center;
    margin-top: 0.75rem;
}

.source-link a {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Desktop-specific styles */
@media (min-width: 768px) {
    #index-value {
        font-size: 3.5rem; /* Larger font on desktop */
    }
    
    #index-classification {
        font-size: 1.8rem; /* Larger font on desktop */
    }
    
    h1 {
        font-size: 2rem; /* Larger heading on desktop */
    }
}