:root {
    --primary: #06B6D4;
    --primary-hover: #0891B2;
    --secondary: #22D3EE;
    --accent: #67E8F9;
    --bg-dark: #070e11;
    --bg: #0D1A1F;
    --bg-surface: #152A32;
    --bg-surface-hover: #1e3a45;
    --border: #22424f;
    --text-main: #F8FAFC;
    --text-muted: #94A3B8;
    --danger: #EF4444;
    --danger-hover: #DC2626;
    --success: #10B981;
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --transition: 0.2s cubic-bezier(0.4, 0, 0.2, 1);
}

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

body {
    font-family: 'Inter', system-ui, -apple-system, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    line-height: 1.5;
    min-height: 100vh;
    display: flex;
    justify-content: center;
    overflow-x: hidden;
}

.app-container {
    width: 100%;
    max-width: 1000px;
    padding: 2rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* Header */
header {
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    padding: 1rem 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 1rem;
    box-shadow: 0 10px 30px -10px rgba(0, 0, 0, 0.5);
}

.header-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
}

.logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--primary);
}

.logo h1 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-main);
}

.header-actions {
    display: flex;
    gap: 0.75rem;
}

/* Base Components */
.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 500;
    cursor: pointer;
    border: none;
    transition: var(--transition);
    font-family: inherit;
}

.btn.icon-only {
    padding: 0.625rem;
}

.btn:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-hover);
    box-shadow: 0 0 15px rgba(6, 182, 212, 0.4);
}

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

.btn-secondary:hover:not(:disabled) {
    background-color: var(--bg-surface-hover);
    border-color: var(--primary);
}

.btn-danger {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-danger:hover:not(:disabled) {
    background-color: var(--danger);
    color: #fff;
}

.btn-record {
    background-color: rgba(239, 68, 68, 0.1);
    color: var(--danger);
    border: 1px solid rgba(239, 68, 68, 0.3);
}

.btn-record.recording {
    background-color: rgba(239, 68, 68, 0.2);
    animation: pulse-record 1.5s infinite;
}

@keyframes pulse-record {
    0% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    70% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
    100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0); }
}

.record-indicator {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    background-color: var(--danger);
    display: inline-block;
}

.w-full {
    width: 100%;
}

/* Forms */
.form-group {
    margin-bottom: 1.25rem;
}

.form-group.row {
    display: flex;
    gap: 1rem;
}

.form-group .col {
    flex: 1;
}

label {
    display: block;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-muted);
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    background-color: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: var(--radius-sm);
    color: var(--text-main);
    font-family: inherit;
    font-size: 0.875rem;
    transition: border-color var(--transition);
}

.form-control:focus {
    outline: none;
    border-color: var(--primary);
}

select.form-control {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2394A3B8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
    padding-right: 2.5rem;
}

.color-picker {
    padding: 0;
    height: 40px;
    cursor: pointer;
}

.color-picker::-webkit-color-swatch-wrapper {
    padding: 4px;
}

.color-picker::-webkit-color-swatch {
    border: none;
    border-radius: 4px;
}

.slider {
    width: 100%;
    height: 6px;
    background: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 3px;
    outline: none;
    -webkit-appearance: none;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
    border: none;
    transition: var(--transition);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.2);
    box-shadow: 0 0 10px rgba(6, 182, 212, 0.5);
}

/* Checkboxes */
.checkbox-group {
    margin-bottom: 1.25rem;
}

.custom-checkbox {
    display: flex;
    align-items: center;
    position: relative;
    padding-left: 30px;
    cursor: pointer;
    font-size: 0.875rem;
    color: var(--text-main);
    user-select: none;
}

.custom-checkbox input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    left: 0;
    height: 20px;
    width: 20px;
    background-color: var(--bg-dark);
    border: 1px solid var(--border);
    border-radius: 4px;
    transition: var(--transition);
}

.custom-checkbox:hover input ~ .checkmark {
    border-color: var(--primary);
}

.custom-checkbox input:checked ~ .checkmark {
    background-color: var(--primary);
    border-color: var(--primary);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
    left: 6px;
    top: 2px;
    width: 5px;
    height: 10px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.custom-checkbox input:checked ~ .checkmark:after {
    display: block;
}

/* Pad Grid */
.pad-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-gap: 1.5rem;
    margin: 0 auto;
    width: 100%;
}

.pad-grid.grid-9 {
    grid-template-columns: repeat(3, 1fr);
    max-width: 600px;
}

.pad-grid.grid-25 {
    grid-template-columns: repeat(5, 1fr);
}

.sound-pad {
    aspect-ratio: 1 / 1;
    background-color: var(--bg-surface);
    border: 2px solid var(--border);
    border-radius: var(--radius-lg);
    position: relative;
    cursor: pointer;
    overflow: hidden;
    transition: transform 0.1s, box-shadow 0.1s;
    user-select: none;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
}

.sound-pad:hover {
    transform: translateY(-2px);
    border-color: var(--bg-surface-hover);
    background-color: var(--bg-surface-hover);
}

.sound-pad.active {
    transform: scale(0.95);
    background-color: var(--pad-color, var(--primary));
    border-color: var(--pad-color, var(--primary));
    box-shadow: 0 0 20px var(--pad-color, var(--primary));
}

.sound-pad.has-sound {
    border-color: var(--pad-color, var(--primary));
}

.pad-key-hint {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    font-size: 0.75rem;
    font-weight: 700;
    background-color: rgba(0, 0, 0, 0.4);
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    color: var(--text-main);
    z-index: 2;
}

.pad-label-display {
    font-weight: 600;
    font-size: 1rem;
    text-align: center;
    padding: 0 0.5rem;
    z-index: 2;
    word-break: break-word;
    text-shadow: 0 1px 3px rgba(0,0,0,0.8);
}

.empty-icon {
    color: var(--text-muted);
    opacity: 0.5;
    z-index: 2;
}

.pad-edit-btn {
    position: absolute;
    top: 0.5rem;
    right: 0.5rem;
    background: rgba(0,0,0,0.5);
    border: none;
    color: var(--text-main);
    width: 28px;
    height: 28px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    transition: opacity 0.2s, background 0.2s;
    z-index: 3;
}

.sound-pad:hover .pad-edit-btn {
    opacity: 1;
}

.pad-edit-btn:hover {
    background: var(--primary);
}

.pad-waveform {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 40%;
    z-index: 1;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s;
}

.sound-pad.playing .pad-waveform {
    opacity: 0.5;
}

.loop-indicator {
    position: absolute;
    bottom: 0.75rem;
    right: 0.75rem;
    color: var(--text-main);
    opacity: 0.6;
    z-index: 2;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    z-index: 100;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.modal.show {
    display: flex;
    animation: fadeIn 0.2s ease-out;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal-content {
    background-color: var(--bg);
    border: 1px solid var(--border);
    border-radius: var(--radius-lg);
    width: 100%;
    max-width: 500px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    animation: slideUp 0.3s ease-out;
}

.modal-content.modal-sm {
    max-width: 400px;
}

@keyframes slideUp {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}

.modal-header {
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    font-size: 1.25rem;
    font-weight: 600;
}

.close-btn {
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 1.5rem;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.close-btn:hover {
    color: var(--text-main);
}

.modal-body {
    padding: 1.5rem;
    overflow-y: auto;
}

.modal-footer {
    padding: 1.25rem 1.5rem;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.right-actions {
    display: flex;
    gap: 0.75rem;
}

.divider {
    border: 0;
    border-top: 1px solid var(--border);
    margin: 1.5rem 0;
}

.alert {
    padding: 0.75rem;
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    margin-bottom: 1rem;
}

.alert-info {
    background-color: rgba(6, 182, 212, 0.1);
    color: var(--accent);
    border: 1px solid rgba(6, 182, 212, 0.2);
}

/* Editor Tabs */
.editor-tabs {
    display: flex;
    background-color: var(--bg-dark);
    border-radius: var(--radius-sm);
    padding: 0.25rem;
    margin-bottom: 1.5rem;
}

.tab-btn {
    flex: 1;
    background: none;
    border: none;
    padding: 0.5rem;
    color: var(--text-muted);
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: calc(var(--radius-sm) - 2px);
    cursor: pointer;
    transition: var(--transition);
}

.tab-btn:hover {
    color: var(--text-main);
}

.tab-btn.active {
    background-color: var(--bg-surface);
    color: var(--text-main);
    box-shadow: 0 1px 3px rgba(0,0,0,0.3);
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s;
}

/* Upload Zone */
.file-upload-zone {
    border: 2px dashed var(--border);
    border-radius: var(--radius-md);
    padding: 2rem 1rem;
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    background-color: rgba(21, 42, 50, 0.3);
}

.file-upload-zone:hover, .file-upload-zone.dragover {
    border-color: var(--primary);
    background-color: rgba(6, 182, 212, 0.05);
}

.file-upload-zone svg {
    color: var(--primary);
    margin-bottom: 1rem;
}

.file-upload-zone p {
    color: var(--text-muted);
    font-size: 0.875rem;
    margin-bottom: 0.5rem;
}

.file-name-display {
    display: block;
    font-weight: 500;
    color: var(--accent);
    word-break: break-all;
    font-size: 0.875rem;
}

/* Record Zone */
.record-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    align-items: center;
}

.record-visualizer {
    width: 100%;
    height: 100px;
    background-color: var(--bg-dark);
    border-radius: var(--radius-sm);
    overflow: hidden;
    position: relative;
    border: 1px solid var(--border);
}

#record-canvas {
    width: 100%;
    height: 100%;
}

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

.status-msg {
    font-size: 0.875rem;
    color: var(--text-muted);
    min-height: 1.5em;
}

/* Responsive */
@media (max-width: 768px) {
    .pad-grid {
        grid-template-columns: repeat(3, 1fr) !important;
        grid-gap: 1rem;
    }
    
    .pad-grid.grid-9 {
        grid-template-columns: repeat(3, 1fr) !important;
    }
    
    .header-content {
        flex-direction: column;
        align-items: flex-start;
    }
    
    .header-actions {
        width: 100%;
        justify-content: space-between;
    }
}

@media (max-width: 480px) {
    .pad-grid {
        grid-template-columns: repeat(2, 1fr) !important;
    }
    .modal-content {
        height: 100%;
        max-height: 100vh;
        border-radius: 0;
    }
}