:root {
    --bg-color: #0c0c0e;
    --surface-color: #16161a;
    --surface-hover: #1e1e24;
    --primary-color: #8c7ae6;
    --primary-dim: #4834d4;
    --text-main: #e0e0e0;
    --text-dim: #95afc0;
    --accent-color: #f0932b;
    --shadow-color: rgba(0, 0, 0, 0.5);
    --transition-slow: 2s;
    --transition-fast: 0.3s;
}

* { box-sizing: border-box; margin: 0; padding: 0; -webkit-tap-highlight-color: transparent; }

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color); color: var(--text-main);
    overflow: hidden; height: 100vh; width: 100vw;
}

.app-container {
    display: grid;
    grid-template-columns: 380px 1fr;
    grid-template-rows: 1fr auto;
    width: 100%;
    height: 100vh;
}

/* Sidebar Area (Left Column) */
.sidebar {
    grid-column: 1; grid-row: 1;
    background-color: var(--surface-color);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    display: flex; flex-direction: column; overflow: hidden;
}

.sidebar-header { padding: 1.5rem 2rem; border-bottom: 1px solid rgba(255, 255, 255, 0.05); }
.app-title { font-size: 1.1rem; font-weight: 300; letter-spacing: 2px; text-transform: uppercase; color: var(--text-dim); }

.genre-view { flex: 1; display: flex; flex-direction: column; overflow-y: auto; }
.section-header { padding: 1rem 2rem; }
.section-header h2 { font-size: 0.9rem; font-weight: 600; letter-spacing: 1px; color: var(--text-dim); text-transform: uppercase; }

.genre-list { padding: 0 1rem 1rem 1rem; }
.genre-item { padding: 1rem 1.5rem; margin-bottom: 0.5rem; border-radius: 12px; cursor: pointer; transition: background-color var(--transition-fast); }
.genre-item:hover { background-color: var(--surface-hover); }
.genre-item.active { background-color: var(--primary-dim); color: white; }
.genre-name { display: block; font-weight: 500; margin-bottom: 4px; }
.genre-meta { font-size: 0.75rem; color: var(--text-dim); }

/* Playback Controls (Bottom of Left Column) */
.playback-controls {
    grid-column: 1; grid-row: 2;
    background-color: #1a1a20;
    padding: 1.5rem 2rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    border-right: 1px solid rgba(255, 255, 255, 0.05);
    display: flex; flex-direction: column; gap: 1.2rem;
    z-index: 200;
}

.track-info-mini { display: flex; flex-direction: column; gap: 2px; }
#current-track-name { font-weight: 600; font-size: 1rem; white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
#current-genre-name { color: var(--text-dim); font-size: 0.8rem; }

.progress-container { display: flex; align-items: center; gap: 0.8rem; }
.time { font-size: 0.75rem; color: var(--text-dim); min-width: 35px; }
.progress-bar { flex: 1; height: 4px; background: rgba(255, 255, 255, 0.1); border-radius: 2px; cursor: pointer; position: relative; }
.progress-fill { height: 100%; background: var(--primary-color); width: 0%; border-radius: 2px; transition: width 0.1s linear; }

.control-buttons { display: flex; flex-direction: column; gap: 1rem; }
.main-btns { display: flex; align-items: center; justify-content: center; gap: 1.5rem; }

.btn-icon {
    background: none; border: none; color: var(--text-main); cursor: pointer;
    width: 44px; height: 44px; display: flex; align-items: center; justify-content: center;
    border-radius: 50%; transition: all 0.2s;
}
.btn-icon:hover { background: var(--surface-hover); color: white; }
.btn-primary { background: white; color: black; width: 52px; height: 52px; }
.btn-primary:hover { background: var(--primary-color); color: white; transform: scale(1.05); }

.volume-container { display: flex; align-items: center; gap: 10px; padding: 0 0.5rem; }
.volume-icon { width: 18px; color: var(--text-dim); }
input[type="range"] { flex: 1; height: 4px; cursor: pointer; accent-color: var(--primary-color); }

.secondary-btns { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; }
.ratings-container { display: flex; gap: 2px; font-size: 1.1rem; color: rgba(255, 255, 255, 0.1); cursor: not-allowed; }
.ratings-container span.active { color: var(--primary-color); opacity: 1; }

.btn-text.styled {
    background: rgba(255, 255, 255, 0.05); border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-main); padding: 0.5rem 1rem; border-radius: 20px; font-size: 0.8rem;
    cursor: pointer; transition: all 0.2s;
}
.btn-text.styled:hover { background: rgba(255, 255, 255, 0.1); border-color: var(--primary-color); }

/* Main Content Area (Right Column) */
.main-view {
    grid-column: 2; grid-row: 1 / 3;
    overflow-y: auto;
    background: radial-gradient(circle at 50% 0%, #1a1a2e 0%, var(--bg-color) 70%);
}

.playlist-view { padding: 2rem; display: flex; justify-content: center; min-height: 100%; }
.playlist-container { width: 100%; max-width: 1100px; display: flex; flex-wrap: wrap; gap: 1.5rem; justify-content: center; align-content: flex-start; }

.track-card {
    width: 200px; background-color: var(--surface-color); border-radius: 16px;
    overflow: hidden; transition: all 0.5s ease; box-shadow: 0 10px 30px var(--shadow-color);
    position: relative; cursor: default;
}

.track-card.past { opacity: 0.4; transform: scale(0.9); cursor: pointer; }
.track-card.past:hover { opacity: 0.7; transform: scale(0.95); }
.track-card.future { opacity: 0.8; cursor: pointer; }
.track-card.future:hover { opacity: 1; transform: translateY(-5px); }

.track-cover { width: 100%; aspect-ratio: 1; object-fit: cover; filter: brightness(0.8); }
.track-card .track-overlay {
    position: absolute; bottom: 0; left: 0; right: 0; padding: 0.8rem;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.9));
}
.track-title { font-size: 0.85rem; font-weight: 600; display: block; }

/* VERTICAL / MOBILE VIEW */
@media (max-width: 768px) {
    .app-container { display: flex; flex-direction: column; }
    .sidebar { width: 100%; height: auto; flex: 1; min-height: 0; border-right: none; }
    .main-view { width: 100%; height: auto; flex: 1; min-height: 0; }
    .playback-controls { width: 100%; border-right: none; }

    .app-container.show-playlist .sidebar { display: none; }
    .app-container.show-genres .main-view { display: none; }

    .playlist-view { padding: 1rem; }
    .track-card { width: calc(50% - 0.75rem); }
}

.modal { position: fixed; inset: 0; background: rgba(0, 0, 0, 0.85); display: flex; align-items: center; justify-content: center; z-index: 1000; }
.modal-content {
    background: var(--surface-color); padding: 2rem; border-radius: 24px;
    width: 90%; max-width: 360px; text-align: center; border: 1px solid rgba(255, 255, 255, 0.1);
}
.timer-slider-container { margin: 2rem 0; text-align: center; }
.timer-display { font-size: 3rem; font-weight: 200; color: var(--primary-color); margin-bottom: 1.5rem; font-variant-numeric: tabular-nums; }
#timer-slider { width: 100%; height: 6px; margin-bottom: 0.5rem; }
.slider-labels { display: flex; justify-content: space-between; font-size: 0.75rem; color: var(--text-dim); padding: 0 5px; }

.timer-actions { display: flex; flex-direction: column; gap: 1rem; margin-top: 1rem; }
.btn-primary-rect {
    background: var(--primary-color); border: none; color: white; padding: 1rem;
    border-radius: 12px; font-weight: 600; cursor: pointer; transition: all 0.2s;
}
.btn-primary-rect:hover { background: var(--primary-dim); transform: translateY(-2px); }

.btn-outline {
    background: transparent; border: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-main); padding: 0.8rem; border-radius: 12px; cursor: pointer; transition: all 0.2s;
}
.btn-outline:hover { background: rgba(255, 255, 255, 0.05); border-color: var(--text-dim); }
.btn-outline.active { background: var(--surface-hover); border-color: var(--primary-color); color: var(--primary-color); }

.btn-text.danger { color: #ff7675; margin-top: 0.5rem; opacity: 0.7; border: none; background: none; cursor: pointer; }
.timer-checkbox-container {
    display: flex; align-items: center; justify-content: center; gap: 0.8rem;
    margin-bottom: 0.5rem; cursor: pointer; font-size: 0.9rem; color: var(--text-dim);
    user-select: none;
}
.timer-checkbox-container input { width: 18px; height: 18px; cursor: pointer; accent-color: var(--primary-color); }

.attribution {
    text-align: center; font-size: 0.65rem; color: rgba(255, 255, 255, 0.2);
    margin-top: 1rem; padding-bottom: 0; pointer-events: none;
}
.attribution a { color: rgba(255, 255, 255, 0.4); text-decoration: none; pointer-events: auto; }

.hidden { display: none !important; }
.visible-mobile { display: none; }
@media (max-width: 768px) { .visible-mobile { display: block; } }