/* General Styles */
:root {
    --primary-color: #1a73e8;
    --primary-color-dark: #1665c8;
    --background-color: #f0f2f5;
    --surface-color: #ffffff;
    --text-color: #202124;
    --subtle-text-color: #5f6368;
    --border-color: #dadce0;
    --error-color: #d93025;
    --success-color: #1e8e3e;

    --shadow-small: 0 1px 2px 0 rgba(60,64,67,0.3), 0 1px 3px 1px rgba(60,64,67,0.15);
    --shadow-medium: 0 4px 8px 3px rgba(60,64,67,0.15), 0 1px 3px 0 rgba(60,64,67,0.3);
}

body {
    font-family: 'Roboto', sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 20px;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    min-height: 100vh;
}

.container {
    width: 100%;
    max-width: 800px;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Header */
header {
    text-align: center;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin: 0 0 10px;
}

header p {
    font-size: 1.1rem;
    color: var(--subtle-text-color);
    margin: 0;
}

/* Main Content */
main {
    background-color: var(--surface-color);
    padding: 30px;
    border-radius: 8px;
    box-shadow: var(--shadow-medium);
}

/* Form */
#download-form {
    display: flex;
    gap: 10px;
}

#url-input {
    flex-grow: 1;
    padding: 15px;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

#url-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px var(--primary-color-dark);
}

#download-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 15px 30px;
    font-size: 1rem;
    font-weight: 500;
    color: #fff;
    background-color: var(--primary-color);
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
}

#download-button:hover {
    background-color: var(--primary-color-dark);
    transform: translateY(-2px);
}

#download-button:active {
    transform: translateY(0);
}

/* Loading Indicator */
#loading-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 15px;
    margin-top: 30px;
}

.spinner {
    width: 40px;
    height: 40px;
    border: 4px solid var(--primary-color);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* Results Section */
#results-section {
    margin-top: 30px;
}

#results-section h2 {
    text-align: center;
    color: var(--subtle-text-color);
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 15px;
    margin-bottom: 20px;
}

#media-container {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
}

/* Media Item Card (Placeholder) */
.media-card {
    background-color: #fff;
    border-radius: 8px;
    box-shadow: var(--shadow-small);
    overflow: hidden;
    transition: transform 0.3s, box-shadow 0.3s;
}

.media-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.media-card .thumbnail {
    width: 100%;
    height: 120px;
    background-color: #e0e0e0;
    background-size: cover;
    background-position: center;
}

.media-card .info {
    padding: 15px;
}

.media-card .info h3 {
    font-size: 1rem;
    margin: 0 0 10px;
}

.media-card .info button {
    width: 100%;
    padding: 10px;
    font-size: 0.9rem;
    /* ... more button styles */
}


/* Utility Classes */
.hidden {
    display: none !important;
}

/* Responsive Design */
@media (max-width: 600px) {
    body {
        padding: 10px;
    }

    main {
        padding: 20px;
    }
    
    #download-form {
        flex-direction: column;
    }
}