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

:root {
    --primary-color: #7B2CBF;
    --secondary-color: #221F1F;
    --accent-color: #FFFFFF;
    --background-color: #141414;
    --text-color: #FFFFFF;
    --border-color: #333;
    --success-color: #46d369;
    --error-color: #e87c03;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
}

.screen {
    display: none;
}

.screen.active {
    display: block;
}

/* Login Screen */
.login-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    background: linear-gradient(135deg, #141414 0%, #1a1a1a 100%);
}

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

.logo img {
    max-width: 400px;
    height: auto;
}

.logo h1 {
    font-size: 48px;
    color: var(--primary-color);
    font-weight: 700;
    letter-spacing: 2px;
}

.logo p {
    color: #999;
    font-size: 18px;
    margin-top: 10px;
}

#loginForm {
    background: var(--secondary-color);
    padding: 40px;
    border-radius: 8px;
    width: 100%;
    max-width: 400px;
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.5);
}

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

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #ccc;
}

.form-group input,
.form-group select {
    width: 100%;
    padding: 12px 15px;
    background: #333;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    font-size: 16px;
    transition: border-color 0.3s;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.form-group small {
    display: block;
    margin-top: 5px;
    color: #999;
    font-size: 13px;
}

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.btn-primary {
    background: var(--primary-color);
    color: white;
    width: 100%;
}

.btn-primary:hover {
    background: #b20710;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(229, 9, 20, 0.4);
}

.btn-secondary {
    background: #555;
    color: white;
}

.btn-secondary:hover {
    background: #666;
}

.btn-logout {
    background: transparent;
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 8px 20px;
}

.btn-logout:hover {
    background: var(--primary-color);
    color: white;
}

.btn-large {
    padding: 15px 30px;
    font-size: 18px;
    margin-top: 20px;
}

.error-message,
.success-message {
    margin-top: 15px;
    padding: 12px;
    border-radius: 4px;
    display: none;
}

.error-message {
    background: rgba(232, 124, 3, 0.2);
    border: 1px solid var(--error-color);
    color: var(--error-color);
}

.success-message {
    background: rgba(70, 211, 105, 0.2);
    border: 1px solid var(--success-color);
    color: var(--success-color);
}

.error-message.show,
.success-message.show {
    display: block;
}

/* Navbar */
.navbar {
    background: var(--secondary-color);
    padding: 15px 30px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
}

.nav-brand h2 {
    color: var(--primary-color);
    font-size: 24px;
}

.nav-menu {
    display: flex;
    gap: 20px;
    align-items: center;
}

.nav-link {
    background: transparent;
    border: none;
    color: #999;
    font-size: 16px;
    cursor: pointer;
    padding: 8px 16px;
    border-radius: 4px;
    transition: all 0.3s;
}

.nav-link:hover {
    color: white;
    background: rgba(255, 255, 255, 0.1);
}

.nav-link.active {
    color: white;
    background: var(--primary-color);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 40px auto;
    padding: 0 20px;
}

.card {
    background: var(--secondary-color);
    border-radius: 8px;
    padding: 30px;
    margin-bottom: 30px;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
}

.card h3 {
    font-size: 28px;
    margin-bottom: 10px;
    color: var(--primary-color);
}

.subtitle {
    color: #999;
    margin-bottom: 30px;
}

.card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}

/* Tab Content */
.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
}

/* Color Settings */
.color-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-bottom: 40px;
}

.color-input-group {
    background: #1a1a1a;
    padding: 20px;
    border-radius: 8px;
    border: 1px solid var(--border-color);
}

.color-input-group label {
    display: block;
    margin-bottom: 12px;
    font-weight: 600;
    font-size: 16px;
}

.color-picker-wrapper {
    display: flex;
    gap: 10px;
    margin-bottom: 8px;
}

.color-picker-wrapper input[type="color"] {
    width: 60px;
    height: 45px;
    border: 2px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    background: transparent;
}

.color-picker-wrapper input[type="color"]::-webkit-color-swatch-wrapper {
    padding: 0;
}

.color-picker-wrapper input[type="color"]::-webkit-color-swatch {
    border: none;
    border-radius: 2px;
}

.color-text {
    flex: 1;
    padding: 10px;
    background: #333;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    color: var(--text-color);
    font-family: monospace;
    font-size: 14px;
}

/* Preview Section */
.preview-section {
    background: #1a1a1a;
    padding: 30px;
    border-radius: 8px;
    margin-bottom: 30px;
}

.preview-section h4 {
    margin-bottom: 20px;
    font-size: 20px;
}

.app-preview {
    background: var(--background-color);
    border-radius: 8px;
    padding: 20px;
    border: 2px solid var(--border-color);
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 20px;
}

.preview-logo {
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}

.preview-nav {
    display: flex;
    gap: 20px;
}

.preview-nav span {
    color: var(--accent-color);
    cursor: pointer;
    opacity: 0.7;
    transition: opacity 0.3s;
}

.preview-nav span:hover {
    opacity: 1;
}

.preview-content {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 15px;
    margin-bottom: 20px;
}

.preview-card {
    background: var(--secondary-color);
    border-radius: 4px;
    overflow: hidden;
    transition: transform 0.3s;
}

.preview-card:hover {
    transform: scale(1.05);
}

.preview-card-image {
    width: 100%;
    height: 120px;
    background: linear-gradient(135deg, #333 0%, #555 100%);
}

.preview-card-title {
    padding: 10px;
    color: var(--accent-color);
    font-size: 14px;
}

.preview-button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 4px;
    font-size: 16px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s;
}

.preview-button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(229, 9, 20, 0.4);
}

/* Playlists */
.playlists-list {
    display: grid;
    gap: 20px;
}

.playlist-item {
    background: #1a1a1a;
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: border-color 0.3s;
}

.playlist-item:hover {
    border-color: var(--primary-color);
}

.playlist-info h4 {
    font-size: 20px;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.playlist-info p {
    color: #999;
    font-size: 14px;
    margin-bottom: 4px;
}

.playlist-badge {
    display: inline-block;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 12px;
    font-weight: 600;
    margin-top: 8px;
}

.playlist-badge.active {
    background: rgba(70, 211, 105, 0.2);
    color: var(--success-color);
}

.playlist-badge.inactive {
    background: rgba(153, 153, 153, 0.2);
    color: #999;
}

.playlist-actions {
    display: flex;
    gap: 10px;
}

.btn-icon {
    background: transparent;
    border: 1px solid var(--border-color);
    color: var(--text-color);
    padding: 8px 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.3s;
}

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

.btn-delete {
    border-color: var(--error-color);
    color: var(--error-color);
}

.btn-delete:hover {
    background: var(--error-color);
    color: white;
}

.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: #999;
}

.empty-state h4 {
    font-size: 24px;
    margin-bottom: 10px;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--secondary-color);
    border-radius: 8px;
    width: 90%;
    max-width: 600px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 30px;
    border-bottom: 1px solid var(--border-color);
}

.modal-header h3 {
    font-size: 24px;
    color: var(--primary-color);
}

.modal-close {
    background: transparent;
    border: none;
    color: var(--text-color);
    font-size: 32px;
    cursor: pointer;
    line-height: 1;
    transition: color 0.3s;
}

.modal-close:hover {
    color: var(--primary-color);
}

#playlistForm {
    padding: 30px;
}

.modal-actions {
    display: flex;
    gap: 15px;
    margin-top: 30px;
}

.modal-actions button {
    flex: 1;
}

.checkbox-label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
}

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

/* API Info */
.api-info {
    background: #1a1a1a;
    padding: 20px;
    border-radius: 8px;
    margin-top: 20px;
}

.api-endpoint {
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 1px solid var(--border-color);
}

.api-endpoint:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.api-endpoint strong {
    display: block;
    margin-bottom: 8px;
    color: var(--primary-color);
}

.api-endpoint code {
    display: block;
    background: #333;
    padding: 10px;
    border-radius: 4px;
    color: #46d369;
    font-family: monospace;
    font-size: 14px;
    overflow-x: auto;
}

/* Responsive */
@media (max-width: 768px) {
    .navbar {
        flex-direction: column;
        gap: 15px;
    }

    .nav-menu {
        flex-wrap: wrap;
        justify-content: center;
    }

    .color-grid {
        grid-template-columns: 1fr;
    }

    .preview-content {
        grid-template-columns: 1fr;
    }

    .card-header {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .playlist-item {
        flex-direction: column;
        gap: 15px;
        align-items: flex-start;
    }

    .modal-content {
        width: 95%;
    }
}