:root {
    --primary-color: #1DB954;
    --secondary-color: #FFFFFF;
    --background-color: #121212;
    --surface-color: #181818;
    --text-color: #FFFFFF;
    --border-radius-md: 8px;
    --border-radius-pill: 9999px;
}

body {
    background-color: var(--background-color);
    color: var(--text-color);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: var(--primary-color) !important;
}

.hero h1 {
    font-weight: 700;
    background: -webkit-linear-gradient(45deg, var(--primary-color), #1ED760);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.btn-mood {
    background-color: var(--surface-color);
    color: var(--text-color);
    border: 1px solid var(--primary-color);
    border-radius: var(--border-radius-pill);
    padding: 12px 24px;
    font-size: 1.1rem;
    transition: all 0.3s ease;
}

.btn-mood:hover, .btn-mood.active {
    background: linear-gradient(45deg, var(--primary-color), #1ED760);
    color: var(--background-color);
    transform: translateY(-3px);
    box-shadow: 0 4px 15px rgba(30, 215, 96, 0.4);
}

#results {
    padding: 2rem;
    background-color: var(--surface-color);
    border-radius: var(--border-radius-md);
}

.video-container {
    position: relative;
    padding-bottom: 56.25%; /* 16:9 */
    height: 0;
    overflow: hidden;
    max-width: 100%;
    background: #000;
    border-radius: var(--border-radius-md);
    margin-bottom: 1.5rem;
}

.video-container iframe {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

footer {
    color: #a0a0a0;
}