:root {
    --primary-color: #00d2ff;
    --primary-dark: #0099cc;
    --secondary-color: #3a7bd5;
    --accent-color: #2ecc71;
    --bg-dark: #0f172a;
    --bg-card: #1e293b;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --glass-bg: rgba(30, 41, 59, 0.7);
    --glass-border: rgba(255, 255, 255, 0.1);
    --shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: radial-gradient(circle at top right, #1e293b, #0f172a);
    color: var(--text-main);
    line-height: 1.6;
    min-height: 100vh;
    overflow-x: hidden;
}

.container {
    max-width: 1000px;
    margin: 0 auto;
    padding: 2rem;
}

/* Glassmorphism Card */
.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    border-radius: 24px;
    padding: 2.5rem;
    box-shadow: var(--shadow);
    margin-bottom: 2rem;
    animation: fadeIn 0.6s ease-out;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1,
h2,
h3 {
    font-weight: 800;
    letter-spacing: -0.025em;
    margin-bottom: 1.5rem;
    background: linear-gradient(to right, #ffffff, #94a3b8);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

h1 {
    font-size: 3rem;
    line-height: 1.1;
}

p {
    color: var(--text-muted);
    font-size: 1.1rem;
    margin-bottom: 1.5rem;
}

/* Buttons */
.btn-group {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
    margin-top: 2rem;
}

.btn {
    padding: 1rem 2rem;
    border-radius: 12px;
    font-weight: 600;
    text-decoration: none;
    transition: var(--transition);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    border: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: 0 4px 6px -1px rgba(0, 210, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 15px -3px rgba(0, 210, 255, 0.4);
}

.btn-outline {
    background: transparent;
    border: 2px solid var(--glass-border);
    color: var(--text-main);
}

.btn-outline:hover {
    background: var(--glass-border);
    border-color: var(--primary-color);
}

/* Pricing Section */
.price-tag {
    font-size: 4rem;
    font-weight: 900;
    color: var(--accent-color);
    text-align: center;
    margin: 2rem 0;
    text-shadow: 0 0 20px rgba(46, 204, 113, 0.3);
}

.price-tag small {
    font-size: 1.2rem;
    color: var(--text-muted);
    font-weight: 400;
}

/* Features List */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-top: 2rem;
}

.feature-item {
    background: rgba(255, 255, 255, 0.03);
    padding: 1.5rem;
    border-radius: 16px;
    border: 1px solid transparent;
    transition: var(--transition);
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.05);
    border-color: var(--primary-color);
    transform: scale(1.02);
}

/* Music Player Styles */
.player-container {
    background: var(--bg-card);
    border-radius: 32px;
    padding: 2rem;
    border: 1px solid var(--glass-border);
}

#playlist {
    list-style: none;
    margin-top: 1.5rem;
    max-height: 400px;
    overflow-y: auto;
    scrollbar-width: thin;
    scrollbar-color: var(--primary-color) transparent;
}

#playlist::-webkit-scrollbar {
    width: 6px;
}

#playlist::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 10px;
}

#playlist li {
    padding: 1rem 1.5rem;
    border-radius: 12px;
    margin-bottom: 0.5rem;
    cursor: pointer;
    transition: var(--transition);
    background: rgba(255, 255, 255, 0.02);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#playlist li:hover {
    background: rgba(255, 255, 255, 0.05);
}

#playlist li.active {
    background: linear-gradient(to right, rgba(0, 210, 255, 0.1), transparent);
    border-left: 4px solid var(--primary-color);
    color: var(--primary-color);
}

/* Forms */
.form-control {
    width: 100%;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    padding: 1rem;
    color: white;
    margin-bottom: 1rem;
    transition: var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(0, 210, 255, 0.2);
}

/* Responsive */
@media (max-width: 768px) {
    h1 {
        font-size: 2.2rem;
    }

    .container {
        padding: 1rem;
    }

    .glass-card {
        padding: 1.5rem;
    }
}