:root {
    --bg-color: #121212;
    --card-bg: #1e1e1e;
    --text-color: #e0e0e0;
    --accent-blue: #007bff;
    --accent-orange: #ff8c00;
    --accent-green: #4caf50;
    --accent-purple: #9c27b0;
    --border-color: #333;
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
}

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

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: var(--font-main);
    display: flex;
    flex-direction: column;
    min-height: 100dvh;
    overflow-x: hidden;
}

/* Navigation & Header */
header {
    background-color: var(--card-bg);
    padding: 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

header h1 {
    font-size: 1.2rem;
    color: var(--accent-blue);
}

.back-btn {
    background: none;
    border: none;
    color: var(--accent-blue);
    font-size: 1.1rem;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.back-btn:hidden {
    visibility: hidden;
}

.reload-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
    transition: transform 0.3s;
}

.reload-btn:active {
    transform: rotate(180deg);
}

.header-controls {
    display: flex;
    gap: 0.5rem;
    align-items: center;
}

.settings-btn {
    background: none;
    border: none;
    font-size: 1.2rem;
    cursor: pointer;
    padding: 0.5rem;
    display: flex;
    align-items: center;
}

.reload-btn.hidden {
    display: none;
}

.help-btn {
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: var(--accent-blue);
    font-size: 1.1rem;
    font-weight: bold;
    width: 30px;
    height: 30px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
}

.help-btn:active {
    background: rgba(255, 255, 255, 0.2);
}

/* Upload Modal Styles */
.upload-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
    margin-top: 1rem;
}

.upload-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.upload-group label {
    font-size: 0.85rem;
    font-weight: 600;
    opacity: 0.8;
}

.upload-input,
.upload-select {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 12px;
    padding: 0.8rem;
    color: #fff;
    font-size: 1rem;
    outline: none;
    width: 100%;
    box-sizing: border-box;
}

.upload-input:focus,
.upload-select:focus {
    border-color: var(--accent-blue);
}

.btn-upload-submit {
    background-color: var(--accent-blue);
    color: #fff;
    border: none;
    border-radius: 12px;
    padding: 1rem;
    font-size: 1rem;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s, background 0.2s;
    margin-top: 0.5rem;
}

.btn-upload-submit:active {
    transform: scale(0.98);
}

.btn-upload-submit:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

#uploadProgress {
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
    display: none;
}

#uploadProgressBar {
    height: 100%;
    background: var(--accent-blue);
    width: 0%;
    transition: width 0.3s;
}

/* Settings View */
/* Category Grid */
.category-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
    gap: 1rem;
    padding: 1rem 0;
}

.category-tile {
    background-color: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    height: 140px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    gap: 0.8rem;
    cursor: pointer;
    transition: transform 0.2s cubic-bezier(0.175, 0.885, 0.32, 1.275), box-shadow 0.2s, border-color 0.2s;
    position: relative;
    overflow: hidden;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
}

.category-tile::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(180deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0) 100%);
    pointer-events: none;
}

.category-tile:active {
    transform: scale(0.95);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.category-tile h3 {
    font-size: 0.95rem;
    font-weight: 600;
    color: #fff;
    text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
    margin: 0;
}

.category-icon {
    font-size: 2.5rem;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

/* Sound List View */
.sound-list {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    padding: 1rem 0;
}

.sound-item {
    background-color: var(--card-bg);
    border: 1px solid rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 1.2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    transition: transform 0.1s, background-color 0.2s, border-color 0.2s;
    user-select: none;
    position: relative;
    overflow: hidden;
}

.sound-item::before {
    content: '';
    position: absolute;
    left: 0;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--theme-color, var(--accent-blue));
    opacity: 0.8;
}

.sound-item:active {
    transform: scale(0.98);
    background-color: rgba(255, 255, 255, 0.05);
    border-color: rgba(255, 255, 255, 0.1);
}

.sound-item span:first-child {
    font-weight: 500;
    font-size: 1rem;
}

.sound-item span:last-child {
    opacity: 0.3;
    font-size: 1.2rem;
}

/* Sound Control View (Full Screen) */
.control-view {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1rem;
    text-align: center;
}

.control-view h2 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: var(--accent-orange);
}

.controls-card {
    background-color: var(--card-bg);
    padding: 1rem;
    border-radius: 20px;
    border: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    flex: 1;
    /* Allow to grow */
    min-height: 0;
    /* Important for flex child scaling */
}

.vertical-controls-row {
    display: flex;
    flex: 1;
    gap: 1.5rem;
    min-height: 200px;
    /* Fallback */
    height: 100%;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    text-align: center;
    flex: 1;
}

.control-group.fade-group {
    flex: 0 0 80px;
}

.control-group label {
    font-size: 0.85rem;
    font-weight: bold;
    color: var(--accent-blue);
    text-transform: uppercase;
    letter-spacing: 0.05rem;
}

.range-wrap {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    position: relative;
}

.range-wrap input {
    width: 100%;
    cursor: pointer;
}

.boost-range {
    display: flex;
    flex-direction: column;
    gap: 0.2rem;
}

.boost-labels {
    display: flex;
    justify-content: space-between;
    padding: 0 4px;
    font-size: 0.75rem;
    opacity: 0.6;
}

.range-wrap input {
    flex: 1;
}

input[type="range"].vertical.mixer-fader {
    appearance: slider-vertical;
    -webkit-appearance: slider-vertical;
    /* Standard for vertical movement */
    width: 48px;
    /* Bigger button area */
    height: 100%;
    cursor: pointer;
    margin: 0;
    padding: 0;
}

/* Track Slots */
.mixer-track {
    background: linear-gradient(to right, #111 0%, #111 48%, #000 48%, #000 52%, #111 52%, #111 100%);
    border-radius: 4px;
    box-shadow: inset 0 2px 10px rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    padding: 10px 0;
    flex: 1;
}

/* Custom Knob Styling (Chrome/Safari) - Some browsers allow this even with slider-vertical */
input[type="range"].vertical.mixer-fader::-webkit-slider-thumb {
    width: 52px;
    /* Bigger! */
    height: 32px;
    /* Bigger! */
    border: 1px solid #111;
    border-radius: 6px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.8), inset 0 1px 0 rgba(255, 255, 255, 0.3);
    cursor: pointer;
}

#totalVolSlider::-webkit-slider-thumb {
    background: linear-gradient(135deg, #eee 0%, var(--accent-blue) 50%, #444 100%);
}

#durSlider::-webkit-slider-thumb {
    background: linear-gradient(135deg, #eee 0%, var(--accent-green) 50%, #444 100%);
}

#fadeSlider::-webkit-slider-thumb {
    background: linear-gradient(135deg, #eee 0%, var(--accent-purple) 50%, #444 100%);
}

/* Metallic Fader Knobs (Firefox) */
input[type="range"].vertical.mixer-fader::-moz-range-thumb {
    width: 44px;
    height: 28px;
    border: 1px solid #222;
    border-radius: 4px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.7), inset 0 1px 0 rgba(255, 255, 255, 0.4);
    cursor: pointer;
}

#totalVolSlider::-moz-range-thumb {
    background: linear-gradient(135deg, #eee 0%, var(--accent-blue) 50%, #666 100%);
}

#durSlider::-moz-range-thumb {
    background: linear-gradient(135deg, #eee 0%, var(--accent-green) 50%, #666 100%);
}

#fadeSlider::-moz-range-thumb {
    background: linear-gradient(135deg, #eee 0%, var(--accent-purple) 50%, #666 100%);
}

/* Metallic readouts */
.mixer-val {
    background: #000;
    color: var(--accent-orange);
    font-family: 'Courier New', monospace;
    padding: 0.3rem 0.6rem;
    border-radius: 4px;
    font-size: 1.2rem;
    font-weight: bold;
    border: 1px solid #333;
    margin-bottom: 0.6rem;
    box-shadow: inset 0 0 8px rgba(255, 140, 0, 0.3);
    text-shadow: 0 0 5px var(--accent-orange);
}

#totalVolSlider {
    accent-color: var(--accent-blue);
}

#durSlider {
    accent-color: var(--accent-green);
}

#fadeSlider {
    accent-color: var(--accent-purple);
}

.bottom-controls-row {
    display: flex;
    gap: 1rem;
    align-items: stretch;
    margin-top: 0.5rem;
}

.bottom-controls-row .btn-play-large {
    flex: 2;
    /* PLAY button takes more space */
    margin-bottom: 0;
}

.loop-checkbox-wrap {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    background: rgba(255, 140, 0, 0.1);
    padding: 0 1rem;
    border-radius: 12px;
    border: 1px solid rgba(255, 140, 0, 0.2);
    cursor: pointer;
    flex: 1;
    /* Loop takes less space */
}

.loop-checkbox-wrap input {
    width: 20px;
    height: 20px;
    accent-color: var(--accent-orange);
    cursor: pointer;
}

.loop-checkbox-wrap label {
    cursor: pointer;
    font-weight: bold;
    color: var(--accent-orange);
    margin: 0;
}

.btn-play-large {
    width: 100%;
    height: 48px;
    border-radius: 12px;
    background: var(--accent-blue);
    color: white;
    border: none;
    font-size: 1.5rem;
    font-weight: bold;
    cursor: pointer;
    margin-bottom: 1rem;
    transition: transform 0.2s, background-color 0.2s;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 10px rgba(0, 122, 255, 0.2);
}

.btn-play-large.playing {
    background-color: #d32f2f;
    box-shadow: 0 4px 15px rgba(211, 47, 47, 0.4);
}

/* Hidden elements */
.hidden {
    display: none !important;
}

/* Footer */
footer {
    padding: 1.5rem 1rem;
    text-align: center;
    font-size: 0.8rem;
    opacity: 0.7;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.2rem;
}

footer p {
    margin: 0;
    user-select: none;
    touch-action: manipulation;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
    font-style: italic;
}

.version-footer {
    font-size: 0.7rem;
    opacity: 0.5;
    font-weight: bold;
}

/* Modal System */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1000;
    display: flex;
    align-items: flex-end;
    /* Mobile-first bottom sheet style */
    justify-content: center;
    transition: opacity 0.3s;
}

.modal-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
}

.modal-content {
    position: relative;
    background: var(--card-bg);
    width: 100%;
    max-width: 500px;
    padding: 2rem;
    max-height: 85vh;
    overflow-y: auto;
    box-shadow: 0 -10px 25px rgba(0, 0, 0, 0.5);
    transform: translateY(0);
    transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

.modal.hidden {
    opacity: 0;
    pointer-events: none;
}

.modal.hidden .modal-content {
    transform: translateY(100%);
}

.modal-close {
    position: absolute;
    top: 1rem;
    right: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    color: white;
    font-size: 1.5rem;
    width: 32px;
    height: 32px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
}

/* Install Instructions */
.install-instructions {
    text-align: center;
    color: var(--text-color);
}

.install-instructions h2 {
    color: var(--accent-blue);
    margin-bottom: 1rem;
}

.install-instructions p {
    margin-bottom: 1.5rem;
    line-height: 1.4;
    opacity: 0.9;
}

.step-box {
    background: rgba(255, 255, 255, 0.05);
    padding: 1rem;
    border-radius: 12px;
    margin-bottom: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.8rem;
    text-align: left;
}

.step-item {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.step-num {
    background: var(--accent-blue);
    width: 24px;
    height: 24px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    font-weight: bold;
    flex-shrink: 0;
}

.install-icon-sm {
    font-size: 1.2rem;
}

/* Install Button Home */
.install-banner {
    background: linear-gradient(135deg, var(--accent-blue) 0%, #0056b3 100%);
    margin: 1rem;
    padding: 1rem;
    border-radius: 15px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 4px 15px rgba(0, 123, 255, 0.3);
    animation: slideUp 0.5s ease-out;
}

@keyframes slideUp {
    from {
        transform: translateY(20px);
        opacity: 0;
    }

    to {
        transform: translateY(0);
        opacity: 1;
    }
}

.install-banner-text h3 {
    font-size: 1rem;
    margin-bottom: 0.2rem;
}

.install-banner-text p {
    font-size: 0.8rem;
    opacity: 0.9;
}

.btn-install-now {
    background: white;
    color: var(--accent-blue);
    border: none;
    padding: 0.6rem 1.2rem;
    border-radius: 20px;
    font-weight: bold;
    font-size: 0.85rem;
    cursor: pointer;
    white-space: nowrap;
}

@media (min-width: 500px) {
    .modal {
        align-items: center;
    }

    .modal-content {
        border-radius: 20px;
    }
}

/* Mobile Reachability Adjustments */
@media (max-width: 480px) {
    main {
        padding-bottom: 80px;
    }
}