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

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

    --accent: #494fd6;
    --accent-hover: #3b40c4;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;

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

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

body {
    background-color: #0c0c0e;
    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;
    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);
}

/* --- Header --- */
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;
    position: relative;
    z-index: 200;
    align-items: center;
    justify-content: space-between;
}

.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;
    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;
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* --- Forms & Inputs --- */
.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,
input[type="text"] {
    background-color: var(--bg-element);
    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;
    transition: all 0.2s;
}

select:focus,
input[type="text"]:focus {
    outline: none;
    border-color: var(--accent);
}

/* --- Buttons --- */
button {
    border: none;
    font-family: inherit;
    cursor: pointer;
    transition: all 0.2s;
    border-radius: var(--radius-sm);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-weight: 700;
}

button:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(100%);
}

.btn-large {
    padding: 1rem 2rem;
    font-size: 1.2rem;
    border-radius: var(--radius);
}

.btn-small {
    padding: 0.4rem 0.8rem;
    font-size: 0.8rem;
    background-color: var(--bg-element);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-small:hover:not(:disabled) {
    background-color: var(--bg-hover);
}

.btn-danger {
    background-color: var(--danger);
    color: #fff;
    box-shadow: 0 4px 12px rgba(239, 68, 68, 0.4);
}

.btn-danger:hover:not(:disabled) {
    background-color: #dc2626;
    transform: translateY(-2px);
}

.btn-warning {
    background-color: var(--warning);
    color: #000;
}

.btn-surface {
    background-color: var(--bg-hover);
    color: var(--text-main);
    border: 1px solid var(--border);
}

.btn-success {
    background-color: var(--success);
    color: #fff;
}

.btn-primary {
    background-color: var(--accent);
    color: #fff;
    padding: 0.8rem;
    font-size: 1rem;
}

/* --- Section 1: Recording --- */
.top-row {
    display: flex;
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.flex-fill {
    flex: 1;
}

.recording-display {
    background-color: #000;
    border-radius: var(--radius);
    padding: 2rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
    border: 1px solid var(--border);
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.5);
    align-items: center;
}

.clock-container {
    display: flex;
    align-items: center;
    gap: 1.5rem;
}

#recording-indicator {
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background-color: #333;
    transition: background-color 0.2s;
}

#recording-indicator.recording {
    background-color: var(--danger);
    box-shadow: 0 0 15px var(--danger);
    animation: blink 1s infinite alternate;
}

#recording-indicator.paused {
    background-color: var(--warning);
    box-shadow: 0 0 10px var(--warning);
}

@keyframes blink {
    100% {
        opacity: 0.5;
    }
}

#timer-display {
    font-family: var(--font-mono);
    font-size: 4rem;
    font-weight: 700;
    color: var(--danger);
    text-shadow: 0 0 10px rgba(239, 68, 68, 0.5);
    letter-spacing: 0.05em;
    line-height: 1;
}

.visualization-container {
    display: flex;
    width: 100%;
    gap: 1rem;
    justify-content: center;
}

#spectrum-canvas {
    background-color: #111;
    border-radius: var(--radius-sm);
    flex: 1;
    max-width: 600px;
    height: 150px;
}

.vu-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    width: 70px;
    flex-shrink: 0;
}

#vu-canvas {
    background-color: #111;
    border-radius: 4px;
    width: 30px;
    height: 150px;
}

#vu-value {
    font-family: var(--font-mono);
    font-size: 0.7rem;
    color: var(--text-muted);
    white-space: nowrap;
    width: 100%;
    text-align: center;
    display: block;
}

.controls-row {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
}

/* --- Section 2: Editor --- */
#editor-section {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.editor-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.editor-header h2 {
    font-size: 1.2rem;
}

.waveform-container {
    position: relative;
    width: 100%;
    height: 180px;
    background-color: #111;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
    overflow: hidden;
    cursor: crosshair;
}

#waveform-canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

#selection-layer {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background-color: rgba(239, 68, 68, 0.3);
    border-left: 2px solid var(--danger);
    border-right: 2px solid var(--danger);
    pointer-events: none;
    display: none;
}

#playhead {
    position: absolute;
    top: 0;
    left: 0;
    width: 2px;
    height: 100%;
    background-color: var(--danger);
    pointer-events: none;
    z-index: 10;
    display: none;
    box-shadow: 0 0 5px var(--danger);
}

.zoom-indicator {
    position: absolute;
    bottom: 6px;
    right: 8px;
    font-family: var(--font-mono);
    font-size: 0.65rem;
    font-weight: 700;
    color: rgba(255,255,255,0.5);
    pointer-events: none;
    z-index: 5;
    letter-spacing: 0.03em;
}

.waveform-scroll-track {
    width: 100%;
    height: 6px;
    background-color: var(--bg-element);
    border-radius: 3px;
    border: 1px solid var(--border);
    position: relative;
    cursor: pointer;
    display: none;
    margin-top: 4px;
}

.waveform-scroll-track.visible {
    display: block;
}

#waveform-scroll-thumb {
    position: absolute;
    top: 0;
    height: 100%;
    background-color: var(--accent);
    border-radius: 3px;
    cursor: grab;
    min-width: 16px;
    transition: background-color 0.15s;
}

#waveform-scroll-thumb:hover,
#waveform-scroll-thumb.dragging {
    background-color: var(--accent-hover);
    cursor: grabbing;
}

.editor-toolbar {
    display: flex;
    flex-wrap: wrap;
    gap: 0.6rem;
    align-items: center;
    background-color: var(--bg-element);
    padding: 0.8rem 1rem;
    border-radius: var(--radius-sm);
    border: 1px solid var(--border);
}

.playback-controls,
.cut-controls {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.normalize-group {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    margin-left: 15px;
}

.normalize-select {
    background-color: var(--bg-element);
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.35rem 0.5rem;
    border-radius: var(--radius-sm);
    font-family: inherit;
    font-size: 0.78rem;
    cursor: pointer;
}

.normalize-select:focus {
    outline: none;
    border-color: var(--accent);
}

.toolbar-label {
    font-size: 0.75rem;
    color: var(--text-muted);
    font-weight: 700;
    text-transform: uppercase;
    margin-right: 0.5rem;
}

/* --- Export Panel --- */
.export-panel {
    background-color: var(--bg-element);
    border: 1px solid var(--border);
    padding: 1.5rem;
    border-radius: var(--radius-sm);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.export-options {
    display: flex;
    gap: 1.5rem;
    align-items: end;
}

.export-options .input-group {
    flex: 1;
}

.export-action {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0.5rem;
}

#export-size-estimate {
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

.progress-bar-bg {
    height: 8px;
    background-color: var(--bg-panel);
    border-radius: 4px;
    overflow: hidden;
    margin-top: 1rem;
}

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

.conv-progress-text {
    display: flex;
    justify-content: space-between;
    font-size: 0.8rem;
    margin-top: 0.5rem;
    color: var(--text-muted);
}

.open-file-row {
    display: flex;
    justify-content: flex-start;
    margin-top: 0.75rem;
    margin-bottom: 1.5rem;
}

.back-row {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-top: 1rem;
}

/* --- Status Bar --- */
.status-bar {
    background-color: var(--bg-element);
    border-top: 1px solid var(--border);
    padding: 0.5rem 1.5rem;
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
}

.status-msg {
    margin-top: 1rem;
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    text-align: center;
    font-size: 0.85rem;
}

.status-error {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.2);
}