:root {
    --primary-color: #3498db;
    --accent-color: #2ecc71;
    --light-bg: #ecf0f1;
    --light-surface: #ffffff;
    --light-text: #2c3e50;
    --dark-bg: #2c3e50;
    --dark-surface: #34495e;
    --dark-text: #ecf0f1;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    font-family: var(--font-family);
    margin: 0;
    padding: 0;
    overflow: hidden;
    transition: background-color 0.3s, color 0.3s;
}

body.light-theme {
    background-color: var(--light-bg);
    color: var(--light-text);
    --bg-color: var(--light-bg);
    --surface-color: var(--light-surface);
    --text-color: var(--light-text);
}

body.dark-theme {
    background-color: var(--dark-bg);
    color: var(--dark-text);
    --bg-color: var(--dark-bg);
    --surface-color: var(--dark-surface);
    --text-color: var(--dark-text);
}

#app-container {
    display: flex;
    height: 100vh;
}

/* --- Sidebar --- */
#sidebar {
    width: 350px;
    background-color: var(--surface-color);
    display: flex;
    flex-direction: column;
    border-right: 1px solid rgba(0,0,0,0.1);
    transition: background-color 0.3s;
}

#sidebar-header {
    padding: 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

#sidebar-header h1 {
    margin: 0;
    font-size: 24px;
    color: var(--primary-color);
}

/* Theme Switcher */
.theme-switcher {
    display: flex;
    align-items: center;
    gap: 8px;
}
.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}
.switch input { display: none; }
.slider {
    position: absolute;
    cursor: pointer;
    top: 0; left: 0; right: 0; bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 20px;
}
.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}
input:checked + .slider {
    background-color: var(--primary-color);
}
input:checked + .slider:before {
    transform: translateX(20px);
}

#sidebar-tabs {
    display: flex;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.tab-link {
    flex: 1;
    padding: 15px;
    background: none;
    border: none;
    font-size: 16px;
    cursor: pointer;
    color: var(--text-color);
    opacity: 0.7;
    transition: opacity 0.2s, border-bottom 0.2s;
    border-bottom: 3px solid transparent;
}

.tab-link.active {
    opacity: 1;
    border-bottom: 3px solid var(--primary-color);
}

.tab-content {
    display: none;
    flex-grow: 1;
    overflow-y: auto;
    flex-direction: column;
}

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

.toolbar {
    padding: 15px;
    border-bottom: 1px solid rgba(0,0,0,0.1);
}

.search-bar {
    position: relative;
    margin-bottom: 10px;
}

.search-bar input {
    width: 100%;
    padding: 10px 10px 10px 35px;
    border-radius: 5px;
    border: 1px solid #ccc;
    background-color: var(--bg-color);
    color: var(--text-color);
    box-sizing: border-box;
}

.search-bar .fa-search {
    position: absolute;
    top: 12px;
    left: 12px;
    color: #aaa;
}

#genre-filter {
    width: 100%;
    padding: 10px;
    border-radius: 5px;
    border: 1px solid #ccc;
    background-color: var(--bg-color);
    color: var(--text-color);
}

#station-list, #discover-list {
    flex-grow: 1;
    overflow-y: auto;
    padding: 10px;
}

.station-item, .discover-item {
    display: flex;
    align-items: center;
    padding: 15px;
    border-radius: 5px;
    cursor: pointer;
    transition: background-color 0.2s;
    margin-bottom: 5px;
}

.station-item:hover, .discover-item:hover {
    background-color: rgba(0,0,0,0.1);
}

.station-item.playing {
    background-color: var(--primary-color);
    color: white;
}

.station-item-info {
    flex-grow: 1;
}

.station-item-info h3 {
    margin: 0;
    font-size: 16px;
}

.station-item-info p {
    margin: 0;
    font-size: 12px;
    opacity: 0.7;
}

.station-item-controls button, .discover-item-controls button {
    background: none;
    border: none;
    color: var(--text-color);
    cursor: pointer;
    font-size: 16px;
    margin-left: 10px;
    opacity: 0.7;
    transition: opacity 0.2s;
}

.station-item.playing .station-item-controls button {
    color: white;
}

.station-item-controls button:hover, .discover-item-controls button:hover {
    opacity: 1;
}

.sidebar-btn {
    padding: 15px;
    background-color: var(--accent-color);
    color: white;
    border: none;
    font-size: 16px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.sidebar-btn:hover {
    filter: brightness(1.1);
}

/* --- Main Content --- */
#main-content {
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    background-color: var(--bg-color);
}

#visualizer-container {
    flex-grow: 1;
    position: relative;
    background-color: #000;
}

#visualizer {
    width: 100%;
    height: 100%;
}

#player-container {
    padding: 30px;
    background-color: var(--surface-color);
    border-top: 1px solid rgba(0,0,0,0.1);
    text-align: center;
}

#now-playing {
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 20px;
}

#now-playing img {
    width: 80px;
    height: 80px;
    border-radius: 5px;
    margin-right: 20px;
}

#now-playing h2 {
    margin: 0;
    font-size: 28px;
}

#now-playing p {
    margin: 0;
    font-size: 16px;
    opacity: 0.7;
}

#player-controls {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 20px;
    margin-bottom: 20px;
}

#player-controls button {
    background: none;
    border: 1px solid var(--text-color);
    color: var(--text-color);
    border-radius: 50%;
    width: 60px;
    height: 60px;
    font-size: 24px;
    cursor: pointer;
    transition: all 0.2s;
}

#player-controls button#play-pause-btn {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
    width: 70px;
    height: 70px;
}

#player-controls button:hover {
    transform: scale(1.1);
}

.volume-control {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    width: 300px;
    margin: 0 auto;
}

.volume-control input[type="range"] {
    flex-grow: 1;
}

#recommendations-container {
    padding: 20px;
    background-color: var(--bg-color);
    border-top: 1px solid rgba(0,0,0,0.1);
}

#recommendations-container h3 {
    margin-top: 0;
    text-align: center;
}

#recommendations-list {
    display: flex;
    gap: 15px;
    justify-content: center;
}

.rec-item {
    background-color: var(--surface-color);
    padding: 15px;
    border-radius: 5px;
    text-align: center;
    cursor: pointer;
    transition: transform 0.2s;
}

.rec-item:hover {
    transform: translateY(-5px);
}

/* --- App Controls --- */
#app-controls {
    position: absolute;
    top: 20px;
    right: 20px;
    display: flex;
    gap: 10px;
}

#app-controls button {
    background-color: var(--surface-color);
    border: 1px solid #ccc;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    font-size: 18px;
    cursor: pointer;
    color: var(--text-color);
    transition: all 0.2s;
}

#app-controls button:hover {
    background-color: var(--primary-color);
    color: white;
}

/* --- Modals --- */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0,0,0,0.5);
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background-color: var(--surface-color);
    padding: 30px;
    border-radius: 10px;
    width: 90%;
    max-width: 500px;
    position: relative;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.close-btn {
    position: absolute;
    top: 15px;
    right: 15px;
    font-size: 24px;
    font-weight: bold;
    cursor: pointer;
}

#station-form label, .color-picker-section h3, #import-export-modal h3 {
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
}

#station-form input {
    width: 100%;
    padding: 10px;
    margin-bottom: 15px;
    border-radius: 5px;
    border: 1px solid #ccc;
    box-sizing: border-box;
    background-color: var(--bg-color);
    color: var(--text-color);
}

#station-form button, .modal-content button {
    width: 100%;
    padding: 12px;
    border: none;
    border-radius: 5px;
    background-color: var(--primary-color);
    color: white;
    font-size: 16px;
    cursor: pointer;
    transition: filter 0.2s;
}

#station-form button:hover, .modal-content button:hover {
    filter: brightness(1.1);
}

.color-picker-section .color-input {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.color-picker-section input[type="color"] {
    width: 50px;
    height: 30px;
    border: none;
    padding: 0;
    cursor: pointer;
}

#reset-colors-btn {
    background-color: #95a5a6;
    margin-top: 10px;
}

#timer-options {
    display: flex;
    justify-content: space-around;
    margin: 20px 0;
}

#timer-options button {
    width: auto;
    padding: 10px 20px;
}

#timer-display {
    text-align: center;
    font-size: 18px;
    margin: 20px 0;
}

#cancel-timer-btn {
    background-color: #e74c3c;
}

#import-export-modal .import-section, #import-export-modal .export-section {
    margin-bottom: 20px;
}

#import-export-modal input[type="file"] {
    display: block;
    margin: 10px 0;
}

/* --- Equalizer --- */
#equalizer-controls {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.eq-presets {
    display: flex;
    align-items: center;
    gap: 10px;
}

#eq-presets-select {
    padding: 8px;
    border-radius: 5px;
    border: 1px solid #ccc;
    background-color: var(--bg-color);
    color: var(--text-color);
}

#eq-bands {
    display: flex;
    justify-content: space-around;
    align-items: flex-end;
    height: 200px;
    gap: 10px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 5px;
}

.eq-band {
    display: flex;
    flex-direction: column;
    align-items: center;
    flex-grow: 1;
}

.eq-band input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 150px;
    height: 8px;
    transform: rotate(-90deg);
    transform-origin: 75px 75px;
    background: #ddd;
    border-radius: 5px;
    outline: none;
    opacity: 0.7;
    transition: opacity .2s;
}

.eq-band input[type="range"]:hover {
    opacity: 1;
}

.eq-band label {
    font-size: 12px;
    margin-top: 10px;
}

#reset-eq-btn {
    background-color: #95a5a6;
}

#player-controls button#record-btn {
    color: #e74c3c;
    border-color: #e74c3c;
}

#player-controls button#record-btn.recording {
    background-color: #e74c3c;
    color: white;
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0% {
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0.7);
    }
    70% {
        box-shadow: 0 0 0 10px rgba(231, 76, 60, 0);
    }
    100% {
        box-shadow: 0 0 0 0 rgba(231, 76, 60, 0);
    }
}