* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', Arial, sans-serif;
}

:root {
    --youtube-red: #ff0000;
    --youtube-blue: #065fd4;
    --youtube-black: #030303;
    --youtube-gray: #606060;
    --youtube-light-gray: #f9f9f9;
}

body {
    background-color: var(--youtube-light-gray);
    min-height: 100vh;
}

header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: 56px;
    background-color: white;
    display: flex;
    align-items: center;
    padding: 0 16px;
    border-bottom: 1px solid #ddd;
    z-index: 100;
}

.header-left {
    display: flex;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
}

.logo h1 {
    font-size: 20px;
    color: var(--youtube-black);
    font-weight: 500;
}

.logo .material-icons {
    color: var(--youtube-red);
    font-size: 24px;
}

main {
    margin-top: 56px;
    padding: 24px;
    min-height: calc(100vh - 56px);
    display: flex;
    align-items: center;
    justify-content: center;
}

.container {
    width: 100%;
    max-width: 800px;
    margin: 0 auto;
}

.download-card {
    background: white;
    border-radius: 12px;
    padding: 32px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.download-card h2 {
    color: var(--youtube-black);
    font-size: 24px;
    margin-bottom: 8px;
    text-align: center;
}

.subtitle {
    color: var(--youtube-gray);
    text-align: center;
    margin-bottom: 24px;
}

.input-group {
    display: flex;
    gap: 12px;
    margin-bottom: 24px;
}

#video-url {
    flex: 1;
    padding: 12px 16px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-size: 16px;
    outline: none;
    transition: border-color 0.2s;
}

#video-url:focus {
    border-color: var(--youtube-blue);
}

button {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background-color: var(--youtube-blue);
    color: white;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    font-size: 16px;
    font-weight: 500;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #0056b3;
}

.result-container {
    margin-top: 24px;
}

.video-info {
    background: #f8f9fa;
    border-radius: 8px;
    padding: 16px;
    margin-bottom: 16px;
}

.video-info h3 {
    color: var(--youtube-black);
    margin-bottom: 8px;
    font-size: 18px;
}

.video-info p {
    color: var(--youtube-gray);
    margin-bottom: 4px;
    font-size: 14px;
}

.download-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background-color: var(--youtube-red);
    color: white;
    text-decoration: none;
    border-radius: 8px;
    font-weight: 500;
    transition: background-color 0.2s;
}

.download-link:hover {
    background-color: #cc0000;
}

.error-message {
    text-align: center;
    padding: 16px;
    background-color: #ffebee;
    border: 1px solid #ffcdd2;
    border-radius: 8px;
    color: #c62828;
    margin-top: 16px;
    font-size: 14px;
}

.error-message .material-icons {
    font-size: 20px;
    vertical-align: middle;
    margin-right: 8px;
}

@media (max-width: 768px) {
    .download-card {
        padding: 24px 16px;
    }

    .input-group {
        flex-direction: column;
    }

    button {
        width: 100%;
        justify-content: center;
    }
}