body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: #f4f7f6;
    color: #333;
    margin: 0;
    padding: 0;
}

.tdm-top-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    background-color: #cc0000;
    padding: 8px 24px;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.tdm-top-bar-button {
    color: #ffffff;
    background-color: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 8px 16px;
    border-radius: 8px;
    text-decoration: none;
    font-weight: 500;
    font-size: 14px;
    white-space: nowrap;
    transition: background-color 0.2s;
}

.tdm-top-bar-button:hover {
    background-color: rgba(255, 255, 255, 0.2);
}

.container {
    max-width: 960px;
    margin: 30px auto;
    background-color: #fff;
    padding: 30px 40px;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

h1 {
    color: #111;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin-top: 0;
    font-size: 28px;
}

h2 {
    margin-top: 30px;
}

p {
    line-height: 1.6;
    color: #555;
    font-size: 16px;
}

.url-form {
    display: flex;
    gap: 10px;
    margin: 30px 0;
}

.url-form input[type="url"] {
    flex-grow: 1;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-size: 16px;
}

.url-form button {
    background-color: #FF0000;
    color: #fff;
    border: none;
    padding: 12px 20px;
    border-radius: 5px;
    font-size: 16px;
    font-weight: 500;
    cursor: pointer;
    transition: background-color 0.2s;
}

.url-form button:hover {
    background-color: #c40000;
}

.message.error {
    padding: 15px;
    border-radius: 5px;
    font-weight: 500;
    background-color: #f8d7da;
    color: #721c24;
}

.results-area {
    margin-top: 30px;
}

.thumbnail-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.thumbnail-card {
    border: 1px solid #ddd;
    border-radius: 8px;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.thumbnail-preview img {
    width: 100%;
    height: auto;
    display: block;
    background-color: #000;
}

.thumbnail-info {
    padding: 15px;
    text-align: center;
    background-color: #f9f9f9;
}

.thumbnail-info strong {
    font-size: 16px;
    display: block;
    margin-bottom: 5px;
}

.thumbnail-info span {
    font-size: 14px;
    color: #555;
    display: block;
    margin-bottom: 15px;
}

.download-btn {
    display: inline-block;
    background-color: #28a745;
    color: #fff;
    padding: 10px 20px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.2s;
}

.download-btn:hover {
    background-color: #218838;
}