:root {
    --bg-primary: #0f0f0f;
    --bg-secondary: rgba(26, 26, 46, 0.8);
    --bg-card: rgba(22, 33, 62, 0.8);
    --text-primary: #ffffff;
    --text-secondary: #a0a0a0;
    --accent: #ff0000;
    --accent-hover: #cc0000;
    --border: rgba(42, 42, 74, 0.6);
    --radius: 12px;
    --transition: 0.3s ease;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    -webkit-font-smoothing: antialiased;
}

body {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    padding: 20px;
    overflow-x: hidden;
}

.background-blob {
    position: fixed;
    z-index: -1;
    filter: blur(80px);
    opacity: 0.12;
    border-radius: 50%;
}

.blob-1 {
    top: -10%;
    left: -10%;
    width: 40%;
    height: 40%;
    background: var(--accent);
}

.blob-2 {
    bottom: -10%;
    right: -10%;
    width: 35%;
    height: 35%;
    background: #ff6b00;
}

.blob-3 {
    top: 40%;
    left: 40%;
    width: 20%;
    height: 20%;
    background: #ff0044;
}

.container {
    width: 100%;
    max-width: 600px;
}

.main {
    background: var(--bg-secondary);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    padding: 24px;
}

.header {
    text-align: center;
    margin-bottom: 32px;
}

.logo {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo svg {
    color: var(--accent);
}

.subtitle {
    color: var(--text-secondary);
    margin-top: 8px;
    font-size: 1rem;
}

.main {
    border-radius: var(--radius);
    padding: 0;
}

.form {
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.input-group input {
    width: 100%;
    padding: 16px 20px;
    font-size: 1rem;
    background: var(--bg-primary);
    border: 2px solid var(--border);
    border-radius: var(--radius);
    color: var(--text-primary);
    transition: var(--transition);
}

.input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.input-group input::placeholder {
    color: var(--text-secondary);
}

button {
    padding: 16px 24px;
    font-size: 1rem;
    font-weight: 600;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
}

button:hover:not(:disabled) {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

button:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

.hidden {
    display: none !important;
}

.error {
    margin-top: 16px;
    padding: 12px 16px;
    background: rgba(255, 0, 0, 0.1);
    border: 1px solid rgba(255, 0, 0, 0.3);
    border-radius: var(--radius);
    color: #ff6b6b;
    font-size: 0.9rem;
}

.results {
    margin-top: 24px;
}

.video-card {
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border-radius: var(--radius);
    overflow: hidden;
    border: 1px solid var(--border);
}

.video-info {
    padding: 16px;
}

.video-thumbnail {
    width: 100%;
    aspect-ratio: 16/9;
    object-fit: cover;
    border-radius: var(--radius) var(--radius) 0 0;
}

.video-title {
    font-size: 1.1rem;
    font-weight: 600;
    margin: 12px 0 8px;
    line-height: 1.4;
}

.video-meta {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 16px;
}

.formats {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.format-select {
    width: 100%;
    padding: 12px 16px;
    background: var(--bg-primary);
    color: var(--text-primary);
    border: 2px solid var(--border);
    border-radius: 8px;
    font-size: 0.95rem;
    cursor: pointer;
    transition: var(--transition);
}

.format-select:focus {
    outline: none;
    border-color: var(--accent);
}

.format-select option {
    background: var(--bg-primary);
    color: var(--text-primary);
    padding: 8px;
}

.format-btn {
    width: 100%;
    padding: 12px 16px;
    background: var(--accent);
    color: white;
    border: none;
    border-radius: 8px;
    font-size: 0.95rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.format-btn:hover {
    background: var(--accent-hover);
    transform: translateY(-2px);
}

.format-btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
    transform: none;
}

.progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border);
    border-radius: 4px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: var(--accent);
    transition: width 0.3s ease;
    border-radius: 4px;
}

.footer {
    text-align: center;
    margin-top: 24px;
    color: var(--text-secondary);
    font-size: 0.85rem;
}

.seo-copy {
    margin-top: 32px;
    padding: 20px;
    background: var(--bg-card);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    border: 1px solid var(--border);
    border-radius: var(--radius);
}

.seo-copy h2 {
    font-size: 1.1rem;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.seo-copy p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
    margin-bottom: 12px;
}

.seo-copy ul {
    list-style: none;
    padding: 0;
}

.seo-copy li {
    color: var(--text-secondary);
    font-size: 0.9rem;
    padding: 4px 0;
    padding-left: 20px;
    position: relative;
}

.seo-copy li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--accent);
}

.footer-links {
    margin-top: 8px;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
}

.footer-links a:hover {
    color: var(--accent);
}

.faq-container .header {
    text-align: left;
}

.back-link {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    margin-bottom: 16px;
    transition: var(--transition);
}

.back-link:hover {
    color: var(--accent);
}

.faq-page {
    margin-top: 24px;
}

.faq-page h2 {
    font-size: 1.3rem;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.faq-page details {
    background: var(--bg-card);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 12px;
    overflow: hidden;
    transition: var(--transition);
}

.faq-page details[open] {
    border-color: var(--accent);
}

.faq-page summary {
    padding: 16px;
    cursor: pointer;
    font-weight: 600;
    font-size: 0.95rem;
    color: var(--text-primary);
    transition: var(--transition);
}

.faq-page summary:hover {
    color: var(--accent);
}

.faq-page details p {
    padding: 0 16px 16px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.6;
}

@media (max-width: 480px) {
    .logo {
        font-size: 1.5rem;
    }
    
    .main {
        padding: 16px;
    }
}