/* Modern Reset & Variables */
:root {
    --primary-color: #1db954;
    --dark-bg: #121212;
    --card-bg: #181818;
    --text-primary: #ffffff;
    --text-secondary: #b3b3b3;
    --error-color: #e74c3c;
    --transition-speed: 0.3s;
}

body {
    font-family: 'Circular', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    background-color: var(--dark-bg);
    color: var(--text-primary);
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* Auth Container (Login/Register) */
.container {
    max-width: 400px;
    margin: 100px auto;
    background: var(--card-bg);
    padding: 40px;
    border-radius: 8px;
    box-shadow: 0 4px 60px rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.5s ease-in-out;
}

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

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

h2 {
    text-align: center;
    color: var(--text-primary);
    margin-bottom: 30px;
    font-size: 2rem;
}

form div {
    margin-bottom: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--text-secondary);
    font-size: 0.9rem;
    font-weight: bold;
}

input[type="text"],
input[type="email"],
input[type="password"] {
    width: 100%;
    padding: 12px;
    background: #282828;
    border: 1px solid transparent;
    border-radius: 4px;
    color: var(--text-primary);
    box-sizing: border-box;
    transition: border-color var(--transition-speed);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="password"]:focus {
    border-color: var(--primary-color);
    outline: none;
}

input[type="submit"] {
    display: block;
    width: 100%;
    padding: 14px;
    background: var(--primary-color);
    color: #fff;
    border: none;
    border-radius: 30px;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.1s, background-color 0.2s;
    text-transform: uppercase;
    letter-spacing: 1px;
}

input[type="submit"]:hover {
    background-color: #1ed760;
    transform: scale(1.02);
}

input[type="submit"]:active {
    transform: scale(0.98);
}

span {
    color: var(--error-color);
    font-size: 0.85rem;
    display: block;
    margin-top: 5px;
}

a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color 0.2s;
}

a:hover {
    color: var(--primary-color);
    text-decoration: underline;
}

p {
    text-align: center;
    margin-top: 20px;
    font-size: 0.9rem;
}

/* Layout */
.main-container {
    display: flex;
    height: calc(100vh - 90px);
    /* Height minus player bar */
}

.sidebar {
    width: 240px;
    background: #000;
    color: #fff;
    padding: 24px;
    display: flex;
    flex-direction: column;
    flex-shrink: 0;
}

.sidebar .logo {
    font-size: 24px;
    font-weight: bold;
    margin-bottom: 40px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
}

.sidebar ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar li {
    margin-bottom: 10px;
}

.sidebar a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: bold;
    display: flex;
    align-items: center;
    padding: 10px 0;
    transition: color 0.2s;
}

.sidebar a:hover,
.sidebar a.active {
    color: var(--text-primary);
}

.content {
    flex: 1;
    background: var(--dark-bg);
    /* Gradient could go here */
    background: linear-gradient(180deg, #222 0%, #121212 100%);
    color: var(--text-primary);
    padding: 30px;
    overflow-y: auto;
}

/* Track Grid */
.track-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
    gap: 24px;
    margin-bottom: 40px;
}

.track-card {
    background: var(--card-bg);
    padding: 16px;
    border-radius: 6px;
    cursor: pointer;
    transition: background-color 0.3s ease;
    position: relative;
}

.track-card:hover {
    background-color: #282828;
}

.track-card img {
    width: 100%;
    aspect-ratio: 1;
    object-fit: cover;
    border-radius: 4px;
    margin-bottom: 16px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.5);
}

.track-card h3 {
    font-size: 16px;
    font-weight: 700;
    margin: 0 0 4px 0;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.track-card p {
    font-size: 14px;
    border-radius: 2px;
    -webkit-appearance: none;
    appearance: none;
    outline: none;
}

/* Search */
.search-bar {
    margin-bottom: 30px;
}

.search-bar input {
    width: 300px;
    padding: 12px 40px;
    border-radius: 500px;
    border: none;
    background-color: #fff;
    color: #000;
    font-weight: 500;
}

.track-list {
    display: flex;
    flex-direction: column;
}

.track-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.track-row:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.track-row .track-title {
    color: #fff;
    font-weight: normal;
    margin-right: 15px;
    flex: 1;
}

.track-row .track-artist {
    color: #b3b3b3;
    flex: 1;
}

.play-btn {
    background: transparent;
    border: 1px solid #727272;
    color: #fff;
    border-radius: 500px;
    padding: 5px 15px;
    font-size: 12px;
    font-weight: bold;
    cursor: pointer;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.play-btn:hover {
    border-color: #fff;
    transform: scale(1.05);
}