:root {
    --primary-color: #ff0000;
    --secondary-color: #2c2c2c;
    --background-color: #f5f5f5;
    --text-color: #333;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 20px;
    background-color: white;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: var(--primary-color);
}

.form-container {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.input-group {
    display: flex;
    gap: 10px;
}

input[type="text"] {
    flex: 1;
    padding: 12px;
    border: 1px solid #ddd;
    border-radius: var(--border-radius);
    font-size: 16px;
}

button {
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--border-radius);
    padding: 12px 20px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s;
}

button:hover {
    background-color: #cc0000;
}

.format-selector {
    display: flex;
    gap: 20px;
    margin-bottom: 10px;
}

.format-selector label {
    display: flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
}

.hidden {
    display: none;
}

.thumbnail-container {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}

#thumbnail {
    width: 200px;
    height: auto;
    border-radius: var(--border-radius);
}

.video-details {
    flex: 1;
}

#video-title {
    font-size: 18px;
    margin-bottom: 10px;
}

#qualities-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 15px;
}

.quality-option {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 12px;
    background-color: #f9f9f9;
    border-radius: var(--border-radius);
    border: 1px solid #ddd;
}

.quality-option button {
    padding: 8px 15px;
    font-size: 14px;
}

.progress-bar {
    height: 20px;
    background-color: #eee;
    border-radius: 10px;
    margin-bottom: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--primary-color);
    width: 0%;
    transition: width 0.3s;
}

#error-message {
    color: var(--primary-color);
    padding: 10px;
    background-color: #ffeeee;
    border-radius: var(--border-radius);
    text-align: center;
}