/* A modern CSS reset */
:root {
    --primary-color: #007bff;
    --background-color: #f8f9fa;
    --text-color: #333;
    --header-bg: #ffffff;
    --footer-bg: #343a40;
    --footer-text: #f8f9fa;
    --border-color: #dee2e6;
}

body {
    margin: 0;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    line-height: 1.6;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header and Navigation */
header {
    background-color: var(--header-bg);
    padding: 1rem 2rem;
    border-bottom: 1px solid var(--border-color);
    box-shadow: 0 2px 4px rgba(0,0,0,0.05);
    text-align: center;
}

header h1 {
    margin: 0;
    color: var(--primary-color);
}

nav ul {
    padding: 0;
    list-style: none;
    margin-top: 0.5rem;
}

nav ul li {
    display: inline-block;
    margin: 0 15px;
}

nav a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: bold;
}

/* Main Content */
main {
    flex: 1;
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
    width: 90%;    
}

section {
    background-color: #fff;
    padding: 1.5rem;
    margin-bottom: 2rem;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

/* Utility classes */
.hidden {
    display: none;
}

/* Generator section */
#generator {
    text-align: center;
}

#generate-btn {
    background-color: var(--primary-color);
    color: white;
    border: none;
    padding: 0.8rem 1.6rem;
    font-size: 1.1rem;
    font-weight: bold;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.2s ease;
    margin-top: 1rem;
}

#generate-btn:hover:not(:disabled) {
    background-color: #0056b3; /* Darker shade of primary */
    transform: translateY(-2px);
}

#generate-btn:disabled {
    background-color: #a0a0a0;
    cursor: not-allowed;
}

/* Loading Animation */
@keyframes blink {
    0% { content: ""; }
    25% { content: "."; }
    50% { content: ".."; }
    75% { content: "..."; }
}

/* Pulse effect for the button background while loading */
@keyframes pulse-gray {
    0% { background-color: #a0a0a0; }
    50% { background-color: #b0b0b0; }
    100% { background-color: #a0a0a0; }
}

.loading {
    animation: pulse-gray 3s infinite ease-in-out;
    cursor: wait !important;
}

.loading::after {
    content: "";
    animation: blink 3s infinite step-end;
    display: inline-block;
    width: 1.2em;
    text-align: left;
}

/* Vision Display */
#vision-display img {
    max-width: 100%;
    height: auto;
    border-radius: 8px;
    margin-bottom: 1.5rem;
    border: 1px solid var(--border-color);
}

#vision-text {
    white-space: pre-wrap;
}

/* Footer */
footer {
    background-color: var(--footer-bg);
    color: var(--footer-text);
    text-align: center;
    padding: 1.5rem;
}