:root {
    --bg-app: #121214;
    --bg-panel: #1c1c1f;
    --bg-element: #26262b;
    --bg-hover: #303037;
    --border: #33333b;

    --text-main: #f4f4f5;
    --text-muted: #a1a1aa;

    --accent: #6366f1;
    --accent-hover: #4f46e5;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;

    --radius: 12px;
    --radius-sm: 6px;
    --font-family: 'Inter', system-ui, -apple-system, sans-serif;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.5);
}

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

body {
    background-color: #0c0c0e; /* Darker background for depth */
    background-image: radial-gradient(circle at 50% 50%, #1a1a20 0%, #0c0c0e 100%);
    color: var(--text-main);
    font-family: var(--font-family);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    overflow-x: hidden;
}

.app-window {
    width: 100%;
    max-width: 950px;
    height: 90vh; /* Fixed height for software feel */
    max-height: 1000px;
    background-color: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.6), inset 0 1px 1px rgba(255, 255, 255, 0.05);
    position: relative;
}

/* --- Header / Title Bar --- */
header {
    background-color: rgba(28, 28, 31, 0.8);
    backdrop-filter: blur(10px);
    padding: 0.85rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-shrink: 0;
}

.header-brand {
    display: flex;
    align-items: center;
    gap: 0.8rem;
}

.header-logo {
    height: 32px;
    width: auto;
    object-fit: contain;
}

.title {
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--text-main);
}

.subtitle {
    font-weight: 400;
    color: var(--text-muted);
}

/* --- Nav Menu (hamburger) --- */
.nav-menu {
    position: relative;
    flex-shrink: 0;
}

.nav-hamburger {
    background: none;
    border: 1px solid #00AAEF;
    color: #00AAEF;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.3rem 0.6rem;
    border-radius: var(--radius-sm);
    transition: all 0.2s;
    line-height: 1;
}

.nav-hamburger:hover {
    background-color: rgba(0, 170, 239, 0.15);
    border-color: #00AAEF;
}

.nav-dropdown {
    display: none;
    position: absolute;
    top: calc(100% + 6px);
    left: 0;
    background-color: var(--bg-panel);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    box-shadow: var(--shadow);
    min-width: 200px;
    z-index: 100;
    overflow: hidden;
}

.nav-dropdown.open {
    display: block;
}

.nav-link {
    display: block;
    padding: 0.7rem 1rem;
    color: var(--text-muted);
    text-decoration: none;
    font-size: 0.85rem;
    font-weight: 600;
    transition: all 0.15s;
    border-bottom: 1px solid var(--border);
}

.nav-link:last-child {
    border-bottom: none;
}

.nav-link:hover {
    background-color: var(--bg-hover);
    color: var(--text-main);
}

.nav-link.active {
    color: var(--accent);
    background-color: rgba(99, 102, 241, 0.08);
    cursor: default;
}

main {
    flex: 1;
    overflow: hidden; /* Prevent main overflow since queue handles it */
    padding: 0;
    display: flex;
    flex-direction: column;
}

#converter-section {
    background: transparent;
    border: none;
    border-radius: 0;
    padding: 0; /* Removing padding to let queue hit edges */
    box-shadow: none;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 0;
}

/* Internal padding for top controls */
#drop-zone-container, .app-toolbar, #status-msg {
    margin: 1.5rem 1.5rem 0 1.5rem;
}

#status-msg { margin-bottom: 1.5rem; }

/* --- FFmpeg Loader --- */
#loading-overlay {
    position: fixed;
    top: 0; left: 0; width: 100%; height: 100%;
    background: var(--bg-app);
    z-index: 1000;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1.5rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-element);
    border-top: 4px solid var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin { 100% { transform: rotate(360deg); } }

/* --- Drop Zone --- */
#drop-zone-container {
    flex-shrink: 0;
}

#drop-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-sm);
    padding: 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    background-color: rgba(255, 255, 255, 0.02);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

#drop-zone:hover,
#drop-zone.dragover {
    border-color: var(--accent);
    background-color: rgba(99, 102, 241, 0.05);
}

.drop-icon {
    font-size: 2rem;
    display: block;
}

#file-label {
    font-size: 0.9rem;
    color: var(--text-muted);
}

/* --- App Toolbar --- */
.app-toolbar {
    display: flex;
    align-items: flex-end;
    gap: 1.5rem;
    background-color: var(--bg-element);
    padding: 1.25rem;
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    flex-shrink: 0;
}

.controls-grid {
    display: flex;
    gap: 1.5rem;
    flex: 1;
}

.action-buttons {
    display: flex;
    gap: 0.75rem;
    width: 280px;
}

.normalize-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.normalize-row input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: var(--accent);
    cursor: pointer;
    flex-shrink: 0;
}

.normalize-row select {
    flex: 1;
    padding: 0.6rem 0.5rem;
}

.normalize-row select:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

.input-group {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

label {
    font-size: 0.75rem;
    font-weight: 700;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

select {
    background-color: var(--bg-panel);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.6rem 0.8rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.9rem;
    cursor: pointer;
    transition: all 0.2s;
}

select:hover {
    border-color: var(--text-muted);
}

select:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 2px rgba(99, 102, 241, 0.2);
}

/* --- Buttons --- */
button.primary, button.secondary {
    padding: 0.6rem 1rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.85rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.2s;
    width: 100%;
    margin-top: 0;
    border: 1px solid transparent;
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

button.primary {
    background-color: var(--accent);
    color: var(--text-main);
    box-shadow: 0 2px 4px rgba(99, 102, 241, 0.3);
}

button.primary:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(99, 102, 241, 0.4);
}

button.primary:active:not(:disabled) {
    transform: translateY(0);
}

button.primary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    background-color: var(--bg-panel);
    border-color: var(--border);
    box-shadow: none;
}

button.secondary {
    background-color: var(--success);
    color: #fff;
    box-shadow: 0 2px 4px rgba(16, 185, 129, 0.3);
}

button.secondary:hover:not(:disabled) {
    background-color: #0d9e6e;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(16, 185, 129, 0.4);
}

button.secondary:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* --- Progress Bar (shared) --- */
.progress-bar-bg {
    height: 10px;
    background-color: var(--bg-element);
    border-radius: 5px;
    overflow: hidden;
    margin-bottom: 0.5rem;
}

.progress-fill {
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--accent), var(--accent-hover));
    transition: width 0.3s ease;
}

/* --- Status Message --- */
#status-msg {
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-weight: 600;
    font-size: 0.85rem;
    margin-top: 1.25rem;
    display: none;
    text-align: center;
}

.status-error   { background-color: rgba(239, 68, 68, 0.1);  color: var(--danger);  border: 1px solid rgba(239, 68, 68, 0.2); }
.status-success { background-color: rgba(16, 185, 129, 0.1); color: var(--success); border: 1px solid rgba(16, 185, 129, 0.2); }
.status-info    { background-color: var(--bg-element); color: var(--text-secondary); border: 1px solid var(--border); }

/* ==============================
   Global MusicBrainz toggle
   ============================== */

.mb-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin: 1.25rem 1.5rem 1.25rem 1.5rem;
}

.mb-section {
    display: inline-block;
    background-color: var(--bg-element);
    border: 1px solid var(--border);
    border-radius: 20px;
    overflow: hidden;
}

.mb-toggle-label {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    padding: 0.4rem 1rem;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: none;
    letter-spacing: 0;
    transition: all 0.2s;
    user-select: none;
}

.mb-toggle-label:hover {
    background-color: var(--bg-hover);
    color: var(--text-main);
}

.mb-toggle-label input[type="checkbox"] {
    width: 14px;
    height: 14px;
    accent-color: var(--accent);
    cursor: pointer;
    flex-shrink: 0;
}

.mb-toggle-label .mb-logo {
    font-size: 1rem;
    flex-shrink: 0;
}

/* ==============================
   File Queue
   ============================== */

#file-queue-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-height: 250px;
    background-color: var(--bg-element);
    border-top: 1px solid var(--border);
    margin-top: 1.5rem;
    overflow: hidden;
}

.queue-header {
    display: flex;
    padding: 0.6rem 1rem;
    background-color: var(--bg-hover);
    border-bottom: 1px solid var(--border);
    font-size: 0.7rem;
    font-weight: 800;
    text-transform: uppercase;
    color: var(--text-muted);
    letter-spacing: 0.05em;
    position: sticky;
    top: 0;
    z-index: 10;
}

.col-name { flex: 1; }
.col-status { width: 120px; text-align: right; }

.queue-clear-btn {
    background-color: var(--bg-element);
    border: 1px solid var(--border);
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 600;
    padding: 0.4rem 1rem;
    border-radius: 20px; /* Matching .mb-section */
    cursor: pointer;
    transition: all 0.2s;
    user-select: none;
    line-height: normal;
}
.queue-clear-btn:hover { 
    background-color: var(--bg-hover);
    color: var(--danger); 
    border-color: var(--danger); 
}
.queue-clear-btn:disabled { 
    opacity: 0.35; 
    pointer-events: none; 
}

/* --- Global progress bar (multi-file) --- */
#conv-progress {
    margin: 0.75rem 1.5rem 0;
    padding: 0.75rem 1rem;
    background-color: var(--bg-element);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
}
.conv-progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.82rem;
    font-weight: 600;
    margin-top: 0.5rem;
    color: var(--text-secondary);
}

#file-queue {
    flex: 1;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
}

/* Custom scrollbar to avoid "ugly" look */
#file-queue::-webkit-scrollbar { width: 8px; }
#file-queue::-webkit-scrollbar-track { background: transparent; }
#file-queue::-webkit-scrollbar-thumb { background: var(--border); border-radius: 4px; }
#file-queue::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }

.queue-item {
    background-color: transparent;
    border-bottom: 1px solid var(--border);
    transition: background-color 0.2s;
}

.queue-item:nth-child(even) {
    background-color: rgba(255, 255, 255, 0.015);
}

.queue-item:hover {
    background-color: rgba(255, 255, 255, 0.03);
}

.queue-item:last-child {
    border-bottom: none;
}

.queue-item:has(.qi-badge[data-state="done"]) {
    border-color: rgba(16, 185, 129, 0.4);
}

.queue-item:has(.qi-badge[data-state="error"]) {
    border-color: rgba(239, 68, 68, 0.4);
}

/* --- Queue item header --- */
.qi-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    padding: 0.75rem 1rem;
}

.qi-info {
    display: flex;
    align-items: baseline;
    gap: 0.75rem;
    min-width: 0;
    flex: 1;
}

.qi-name {
    font-size: 0.9rem;
    font-weight: 600;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.qi-size {
    font-size: 0.78rem;
    color: var(--text-muted);
    white-space: nowrap;
    flex-shrink: 0;
}

.qi-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    flex-shrink: 0;
}

/* --- Per-file state badge --- */
.qi-badge {
    font-size: 0.72rem;
    font-weight: 700;
    padding: 0.2rem 0.55rem;
    border-radius: 999px;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    white-space: nowrap;
}

.qi-badge[data-state="pending"]    { background: rgba(161,161,170,0.15); color: var(--text-muted); }
.qi-badge[data-state="searching"]  { background: rgba(99,102,241,0.15);  color: var(--accent); }
.qi-badge[data-state="converting"] { background: rgba(99,102,241,0.15);  color: var(--accent); }
.qi-badge[data-state="done"]       { background: rgba(16,185,129,0.15);  color: var(--success); }
.qi-badge[data-state="error"]      { background: rgba(239,68,68,0.15);   color: var(--danger); }

/* Remove button */
.qi-remove {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 0.8rem;
    cursor: pointer;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
    transition: color 0.15s, background 0.15s;
    line-height: 1;
}

.qi-remove:hover {
    color: var(--danger);
    background: rgba(239, 68, 68, 0.1);
}

/* --- Per-file MusicBrainz panel --- */
.qi-mb {
    border-top: 1px dotted var(--border);
    background-color: rgba(99, 102, 241, 0.03);
    padding: 1rem 1.5rem;
}

.qi-mb-status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8rem;
    margin-bottom: 0.6rem;
    min-height: 20px;
    color: var(--text-muted);
}

.qi-mb-status::before {
    flex-shrink: 0;
    display: inline-block;
    width: 14px;
    text-align: center;
    font-size: 0.9em;
}

.qi-mb-status[data-state="idle"]::before      { content: '○'; }
.qi-mb-status[data-state="searching"]         { color: var(--accent); }
.qi-mb-status[data-state="searching"]::before {
    content: '';
    width: 12px;
    height: 12px;
    border: 2px solid var(--accent);
    border-top-color: transparent;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}
.qi-mb-status[data-state="found"]             { color: var(--success); }
.qi-mb-status[data-state="found"]::before     { content: '✓'; font-weight: 700; color: var(--success); }
.qi-mb-status[data-state="not-found"]         { color: var(--warning); }
.qi-mb-status[data-state="not-found"]::before { content: '⚠'; }
.qi-mb-status[data-state="error"]             { color: var(--danger); }
.qi-mb-status[data-state="error"]::before     { content: '✕'; font-weight: 700; }

.qi-mb-retry {
    background: none;
    border: none;
    color: var(--accent);
    font-size: 0.78rem;
    font-family: inherit;
    cursor: pointer;
    padding: 0 0.25rem;
    text-decoration: underline;
    text-underline-offset: 2px;
}

.qi-mb-retry:hover { color: var(--accent-hover); }

/* --- Per-file tag form --- */
.qi-tags-form {
    margin-top: 0.25rem;
}

.mb-tags-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: 0.75rem;
    align-items: end;
}

.tag-input {
    background-color: var(--bg-panel);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.55rem 0.7rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.875rem;
    width: 100%;
    transition: border-color 0.2s;
}

.tag-input:focus {
    outline: none;
    border-color: var(--accent);
}

.tag-input::placeholder {
    color: var(--text-muted);
    opacity: 0.6;
}

/* --- Cover art (pochette) row --- */
.qi-cover-row {
    display: flex;
    align-items: center;
    gap: 0.85rem;
    margin-top: 0.75rem;
    padding-top: 0.65rem;
    border-top: 1px solid var(--border);
}

.qi-cover-thumb-wrap {
    width: 54px;
    height: 54px;
    border-radius: var(--radius-sm);
    overflow: hidden;
    background-color: var(--bg-app);
    border: 1px solid var(--border);
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.qi-cover-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    border-radius: calc(var(--radius-sm) - 1px);
}

.qi-cover-icon {
    font-size: 1.5rem;
    opacity: 0.5;
}

.qi-cover-meta {
    display: flex;
    flex-direction: column;
    gap: 0.3rem;
}

.qi-cover-status {
    font-size: 0.78rem;
    color: var(--text-muted);
}


.mb-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: 0.65rem;
    line-height: 1.4;
}

/* --- Per-file progress --- */
.qi-progress {
    border-top: 1px solid var(--border);
    padding: 0.75rem 1rem;
}

/* --- Per-file download --- */
.qi-download {
    border-top: 1px solid rgba(16, 185, 129, 0.2);
    padding: 0.6rem 1rem;
    background: rgba(16, 185, 129, 0.04);
    display: flex;
    align-items: center;
    gap: 1rem;
}

.qi-dl-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.4rem;
    background-color: var(--success);
    color: #fff;
    text-decoration: none;
    padding: 0.4rem 0.9rem;
    border-radius: var(--radius-sm);
    font-size: 0.82rem;
    font-weight: 700;
    white-space: nowrap;
    transition: background-color 0.2s;
}

.qi-dl-btn:hover {
    background-color: #0d9e6e;
}

/* --- Status Bar --- */
.status-bar {
    background-color: var(--bg-element);
    border-top: 1px solid var(--border);
    padding: 0.35rem 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.7rem;
    font-weight: 600;
    color: var(--text-muted);
    flex-shrink: 0;
}

.status-left {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.status-left::before {
    content: '';
    width: 6px;
    height: 6px;
    background-color: var(--success);
    border-radius: 50%;
    box-shadow: 0 0 4px var(--success);
}

/* --- Responsive --- */
@media (max-width: 768px) {
    body { padding: 1rem; }
    .app-window { height: 95vh; max-height: none; }
    .app-toolbar { flex-direction: column; align-items: stretch; }
    .action-buttons { width: 100%; }
    .mb-tags-grid { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 480px) {
    header { flex-direction: column; gap: 0.5rem; align-items: flex-start; }
    .tagline { display: none; }
    .mb-tags-grid { grid-template-columns: 1fr; }
}