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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: #141824;
    color: #ffffff;
    overflow: hidden;
}

#app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
header {
    background: #1e2433;
    padding: 15px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    z-index: 100;
    flex-shrink: 0;
}

header h1 {
    font-size: 24px;
    margin: 0;
}

.header-controls {
    display: flex;
    gap: 10px;
}

/* Main Container */
#main-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 0; /* ВАЖНО для правильной работы flex */
}

/* Progress Bar - наверху */
#progress-container {
    padding: 4px 10px;
    background: #1e2433;
    border-bottom: 1px solid #2a3142;
    flex-shrink: 0;
    z-index: 10;
    order: 1; /* После header */
}

#progress-bar {
    position: relative;
    height: 20px;
    background: #3c4354;
    border-radius: 10px;
    cursor: pointer;
    overflow: hidden;
}

#progress-fill {
    position: absolute;
    left: 0;
    top: 0;
    height: 100%;
    background: linear-gradient(90deg, #64c896 0%, #96e4c8 100%);
    border-radius: 15px;
    width: 0%;
    transition: width 0.1s linear;
}

#progress-handle {
    position: absolute;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 20px;
    height: 20px;
    background: #ffffff;
    border-radius: 50%;
    box-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
    left: 0%;
    transition: left 0.1s linear;
}

#time-display {
    margin-top: 5px;
    text-align: center;
    font-size: 14px;
    color: #a0a8b8;
}

/* Main Container */
#main-container {
    flex: 1;
    position: relative;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    min-height: 0;
    order: 2; /* После progress bar */
}

/* Canvas - занимает оставшееся пространство */
#notes-canvas {
    flex: 1;
    width: 100%;
    background: linear-gradient(180deg, #141824 0%, #1a1f2e 100%);
    display: block;
    min-height: 0;
}

/* Piano Keyboard - фиксированная высота, всегда видна */
#keyboard-container {
    height: 150px;
    min-height: 150px;
    max-height: 150px;
    width: 100%;
    background: #0a0d14;
    border-top: 2px solid #ff4444;
    flex-shrink: 0;
    position: relative;
    z-index: 5;
    overflow: hidden;
}

#piano-keyboard {
    width: 100%;
    height: 100%;
    display: block;
}

.white-key {
    fill: #f0f0f0;
    stroke: #000;
    stroke-width: 1;
    cursor: pointer;
    transition: fill 0.01s;
}

.white-key:hover {
    fill: #ffffff;
}

.white-key.active {
    fill: #64c8ff !important;
}

.black-key {
    fill: #282828;
    stroke: #000;
    stroke-width: 1;
    cursor: pointer;
    transition: fill 0.01s;
}

.black-key:hover {
    fill: #383838;
}

.black-key.active {
    fill: #3296ff !important;
}

/* Controls */
#controls {
    background: #1e2433;
    padding: 15px 20px;
    display: flex;
    gap: 20px;
    align-items: center;
    flex-wrap: wrap;
    box-shadow: 0 -2px 10px rgba(0, 0, 0, 0.3);
    flex-shrink: 0;
    order: 3; /* После main-container */
}

.control-group {
    display: flex;
    gap: 10px;
    align-items: center;
}

.control-group label {
    font-size: 14px;
    color: #a0a8b8;
}

/* Buttons */
.btn {
    padding: 8px 16px;
    background: #2a3142;
    color: #ffffff;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    transition: all 0.2s;
}

.btn:hover {
    background: #363d52;
    transform: translateY(-1px);
}

.btn:active {
    transform: translateY(0);
}

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

.btn-primary {
    background: #64c896;
    color: #000;
}

.btn-primary:hover {
    background: #7ad4a8;
}

.btn-large {
    padding: 12px 24px;
    font-size: 16px;
}

/* Slider */
input[type="range"] {
    width: 150px;
    height: 6px;
    background: #3c4354;
    border-radius: 3px;
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 16px;
    height: 16px;
    background: #64c896;
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: #64c896;
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

#speed-value {
    font-size: 14px;
    min-width: 80px;
    color: #a0a8b8;
}

#status-display {
    margin-left: auto;
    display: flex;
    gap: 15px;
    align-items: center;
}

#status-text {
    font-size: 14px;
    color: #64c896;
    font-weight: bold;
}

#learning-indicator {
    font-size: 12px;
    color: #ffc864;
}

/* Modals */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: #1e2433;
    border-radius: 12px;
    max-width: 600px;
    width: 90%;
    max-height: 80vh;
    display: flex;
    flex-direction: column;
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5);
}

.modal-content.large {
    max-width: 800px;
}

.modal-header {
    padding: 20px;
    border-bottom: 1px solid #2a3142;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    margin: 0;
    font-size: 20px;
}

.close-btn {
    background: none;
    border: none;
    color: #a0a8b8;
    font-size: 28px;
    cursor: pointer;
    padding: 0;
    width: 30px;
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 4px;
}

.close-btn:hover {
    background: #2a3142;
    color: #ffffff;
}

.modal-body {
    padding: 20px;
    overflow-y: auto;
    flex: 1;
}

/* File List */
#file-list {
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.file-item {
    padding: 15px;
    background: #2a3142;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.file-item:hover {
    background: #363d52;
    transform: translateX(5px);
}

.file-item-name {
    font-weight: 500;
}

.file-item-size {
    font-size: 12px;
    color: #a0a8b8;
}

/* Upload Area */
#upload-area {
    border: 2px dashed #3c4354;
    border-radius: 12px;
    padding: 40px;
    text-align: center;
    transition: all 0.3s;
}

#upload-area.drag-over {
    border-color: #64c896;
    background: rgba(100, 200, 150, 0.1);
}

#upload-area p {
    margin-top: 10px;
    color: #a0a8b8;
}

#upload-status {
    margin-top: 20px;
    font-size: 14px;
}

/* Channel Settings */
#channels-list {
    display: flex;
    flex-direction: column;
    gap: 15px;
}

.channel-item {
    padding: 15px;
    background: #2a3142;
    border-radius: 8px;
    display: flex;
    gap: 20px;
    align-items: center;
}

.channel-label {
    font-weight: bold;
    min-width: 60px;
}

.channel-controls {
    display: flex;
    gap: 15px;
    align-items: center;
    flex: 1;
}

.color-picker {
    width: 40px;
    height: 40px;
    border: 2px solid #fff;
    border-radius: 6px;
    cursor: pointer;
    transition: transform 0.2s;
}

.color-picker:hover {
    transform: scale(1.1);
}

/* Settings */
.setting-item {
    padding: 15px;
    background: #2a3142;
    border-radius: 8px;
    margin-bottom: 15px;
}

.setting-item label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-weight: 500;
}

.setting-description {
    margin-top: 8px;
    font-size: 13px;
    color: #a0a8b8;
}

input[type="checkbox"] {
    width: 20px;
    height: 20px;
    cursor: pointer;
    accent-color: #64c896;
}

/* MIDI Device Items */
.midi-device-item {
    padding: 10px 15px;
    background: #363d52;
    border-radius: 6px;
    margin-bottom: 8px;
    transition: background 0.2s;
}

.midi-device-item:hover {
    background: #3c4354;
}

.midi-device-item label {
    display: flex;
    align-items: center;
    gap: 10px;
    cursor: pointer;
    font-size: 14px;
}

.midi-device-item input[type="checkbox"],
.midi-device-item input[type="radio"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
    accent-color: #64c896;
}

.midi-device-item span {
    flex: 1;
}

#midi-outputs-list h3,
#midi-inputs-list h3 {
    color: #ffffff;
    font-size: 16px;
    margin-bottom: 10px;
}

/* Lighting Modal */
#lighting-modal input[type="number"] {
    width: 80px;
    padding: 8px;
    background: #2a3142;
    color: #fff;
    border: 1px solid #3c4354;
    border-radius: 4px;
}

#lighting-modal input[type="number"]:focus {
    outline: none;
    border-color: #64c896;
}

#lighting-modal h4 {
    color: #ffffff;
    font-size: 16px;
    margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
    header {
        flex-direction: column;
        gap: 10px;
    }

    #controls {
        flex-direction: column;
        align-items: stretch;
    }

    .control-group {
        justify-content: space-between;
    }

    #keyboard-container {
        height: 120px;
        min-height: 120px;
        max-height: 120px;
    }
}

/* Loading Spinner */
.spinner {
    border: 3px solid #3c4354;
    border-top: 3px solid #64c896;
    border-radius: 50%;
    width: 40px;
    height: 40px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
}

@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.hidden {
    display: none !important;
}