/* Reset and Base Styles */
:root {
    --primary-color: #ffffff;
    --secondary-color: #000000;
    --accent-color: #50ABE7;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    line-height: 1.6;
    color: var(--secondary-color);
    background-color: var(--primary-color);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Header & Navigation */
header {
    background-color: var(--primary-color);
    padding: 15px 0;
    position: sticky;
    top: 0;
    z-index: 100;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 10px;
}

.logo {
    color: var(--secondary-color);
    font-size: 1.5rem;
    font-weight: bold;
    text-decoration: none;
}

.nav-links {
    list-style: none;
    display: flex;
    gap: 25px;
}

.nav-links a {
    color: var(--secondary-color);
    text-decoration: none;
    transition: color 0.3s;
}

.nav-links a:hover,
.nav-links a.active {
    color: var(--accent-color);
}

/* Buttons */
.btn {
    display: inline-block;
    background-color: var(--accent-color);
    color: #ffffff;
    padding: 12px 30px;
    text-decoration: none;
    border: none;
    cursor: pointer;
    font-size: 1rem;
    transition: background-color 0.3s;
}

.btn:hover {
    background-color: #3d8bc2;
}

.btn-small {
    padding: 8px 20px;
    font-size: 0.9rem;
}

/* Hero Section */
.hero {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    padding: 80px 0;
    text-align: center;
}

.hero h1 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.hero p {
    font-size: 1.2rem;
    margin-bottom: 30px;
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* Features Section */
.features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 30px;
    padding: 60px 20px;
}

.feature-card {
    background-color: var(--primary-color);
    border: 2px solid var(--secondary-color);
    padding: 30px;
    text-align: center;
}

.feature-card h3 {
    color: var(--secondary-color);
    margin-bottom: 15px;
    font-size: 1.3rem;
}

/* Page Header */
.page-header {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    padding: 50px 0;
    text-align: center;
}

.page-header h1 {
    color: var(--secondary-color);
    margin-bottom: 10px;
}

/* Catalog / Track Cards */
.catalog {
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.grid-layout {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.track-card {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
    border: 2px solid var(--secondary-color);
    background-color: var(--primary-color);
    flex-wrap: wrap;
    gap: 15px;
}

.track-info h3 {
    margin-bottom: 5px;
}

.track-info .genre {
    color: var(--secondary-color);
    font-size: 0.9rem;
}

.track-info .duration {
    color: var(--secondary-color);
    font-size: 0.85rem;
}

.track-actions {
    display: flex;
    align-items: center;
    gap: 15px;
}

.price {
    font-size: 1.2rem;
    font-weight: bold;
}

/* Catalog List / Track Rows */
#catalog-list {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 30px;
}

.track-row {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 25px 20px;
    gap: 15px;
    border: 1px solid #ccc;
    background-color: var(--primary-color);
}

.track-title {
    font-family: 'Inter', sans-serif;
    font-weight: 600;
    font-size: 1.1rem;
    color: var(--secondary-color);
}

.track-row .info {
    width: 100%;
}

.track-row .info strong {
    font-size: 1.2rem;
    color: var(--secondary-color);
}

.track-row .player {
    width: 100%;
}

.track-row .player audio {
    width: 100%;
}

.track-row .actions {
    width: 100%;
}

.track-row .actions button {
    width: 100%;
    background-color: var(--accent-color);
    color: #ffffff;
    padding: 12px 20px;
    border: none;
    cursor: pointer;
    font-size: 0.95rem;
    transition: background-color 0.3s;
    white-space: nowrap;
}

.track-row .actions button:hover {
    background-color: #3d8bc2;
}

.track-row hr {
    display: none;
}

/* Footer */
footer {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    text-align: center;
    padding: 25px 0;
    margin-top: 40px;
    border-top: 1px solid #ccc;
}

footer a {
    color: var(--secondary-color);
}

/* Purchase Page */
.purchase-options {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    padding: 40px 20px;
}

.purchase-card {
    background-color: var(--primary-color);
    color: var(--secondary-color);
    border: 2px solid var(--accent-color);
    padding: 30px;
}

.purchase-card h2 {
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.purchase-desc {
    margin-bottom: 10px;
}

.min-price {
    font-weight: bold;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.purchase-form {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.purchase-form label {
    font-weight: bold;
    margin-top: 5px;
}

.purchase-form input {
    padding: 10px;
    border: 2px solid var(--secondary-color);
    font-size: 1rem;
}

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

.purchase-form .btn {
    margin-top: 15px;
}

.purchase-info {
    padding: 40px 20px;
    text-align: center;
}

.purchase-info h3 {
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.purchase-info ul {
    list-style: none;
    max-width: 500px;
    margin: 0 auto;
    text-align: left;
}

.purchase-info li {
    padding: 10px 0;
    border-bottom: 1px solid #333;
}

.purchase-info li:last-child {
    border-bottom: none;
}

/* Mobile Responsive */
@media (max-width: 768px) {
    header .container {
        justify-content: center;
        text-align: center;
    }

    .nav-links {
        gap: 15px;
    }

    .hero {
        padding: 50px 0;
    }

    .hero h1 {
        font-size: 1.8rem;
    }

    .hero p {
        font-size: 1rem;
    }

    .track-card {
        flex-direction: column;
        text-align: center;
    }

    .track-actions {
        width: 100%;
        justify-content: center;
    }

    #catalog-list {
        grid-template-columns: 1fr;
    }
}