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

:root {
    --spotify-green: #1DB954;
    --spotify-black: #191414;
    --spotify-white: #FFFFFF;
    --spotify-gray: #535353;
    --spotify-light-gray: #B3B3B3;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--spotify-green) 0%, var(--spotify-black) 100%);
    min-height: 100vh;
    padding: 20px;
    color: var(--spotify-white);
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: rgba(25, 20, 20, 0.95);
    border-radius: 16px;
    padding: 40px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

header {
    text-align: center;
    margin-bottom: 40px;
}

h1 {
    font-size: 2.5rem;
    color: var(--spotify-green);
    margin-bottom: 10px;
}

.subtitle {
    color: var(--spotify-light-gray);
    font-size: 1.125rem;
}

.login-section, .app-section {
    text-align: center;
}

.login-section h2 {
    margin-bottom: 15px;
}

.login-section p {
    margin-bottom: 30px;
    color: var(--spotify-light-gray);
}

.btn {
    padding: 12px 30px;
    border: none;
    border-radius: 24px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
    font-size: 1rem;
}

.btn-primary {
    background: var(--spotify-green);
    color: white;
}

.btn-primary:hover {
    background: #1ed760;
    transform: translateY(-2px);
}

.btn-large {
    padding: 15px 40px;
    font-size: 1.125rem;
    width: 100%;
    max-width: 400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.btn-icon {
    font-size: 1.5rem;
}

.privacy-note {
    margin-top: 20px;
    font-size: 0.875rem;
    color: var(--spotify-light-gray);
}

.user-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--spotify-gray);
}

.btn-logout {
    background: transparent;
    border: 2px solid var(--spotify-gray);
    color: var(--spotify-white);
    padding: 8px 20px;
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-logout:hover {
    border-color: var(--spotify-green);
    color: var(--spotify-green);
}

form {
    text-align: left;
}

.form-group {
    margin-bottom: 20px;
}

.form-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

label {
    display: block;
    margin-bottom: 8px;
    color: var(--spotify-green);
    font-weight: 600;
}

input[type="text"],
input[type="number"],
select {
    width: 100%;
    padding: 12px;
    background: var(--spotify-gray);
    border: 2px solid transparent;
    border-radius: 8px;
    color: var(--spotify-white);
    font-size: 1rem;
}

input:focus, select:focus {
    outline: none;
    border-color: var(--spotify-green);
}

.help-text {
    font-size: 0.875rem;
    color: var(--spotify-light-gray);
    margin-top: 5px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
}

.status-message {
    margin-top: 20px;
    padding: 15px;
    border-radius: 8px;
    text-align: center;
    display: none;
}

.status-message.show {
    display: block;
}

.status-message.loading {
    background: rgba(29, 185, 84, 0.2);
    border: 1px solid var(--spotify-green);
}

.status-message.error {
    background: rgba(239, 68, 68, 0.2);
    border: 1px solid #ef4444;
}

.status-message.success {
    background: rgba(29, 185, 84, 0.2);
    border: 1px solid var(--spotify-green);
}

.results {
    margin-top: 30px;
}

.results h2 {
    color: var(--spotify-green);
    margin-bottom: 20px;
}

.playlist-info {
    background: var(--spotify-gray);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.track-list {
    list-style: none;
}

.track-list li {
    background: var(--spotify-gray);
    padding: 12px;
    margin-bottom: 8px;
    border-radius: 8px;
    display: flex;
    align-items: center;
    gap: 12px;
}

.track-number {
    font-weight: bold;
    color: var(--spotify-green);
    min-width: 25px;
}

.track-info {
    flex: 1;
}

.track-name {
    font-weight: 600;
}

.track-artist {
    font-size: 0.875rem;
    color: var(--spotify-light-gray);
}

footer {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid var(--spotify-gray);
    color: var(--spotify-light-gray);
    font-size: 0.875rem;
}

footer a {
    color: var(--spotify-green);
    text-decoration: none;
}

footer a:hover {
    text-decoration: underline;
}

@media (max-width: 768px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2rem;
    }

    .form-row {
        grid-template-columns: 1fr;
    }
}