* {
    box-sizing: border-box;
}

body {
    margin: 0;
    overflow: hidden;
    font-family: 'Consolas', 'Monaco', monospace;
    background: #111;
    color: #eee;
}

canvas {
    display: block;
    background: #1a1a1a;
}

/* ========== Upload Screen ========== */
#upload-screen {
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    background: #111;
}

.upload-container {
    text-align: center;
}

.upload-container h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    font-weight: 300;
    letter-spacing: 2px;
    color: #fff;
}

.upload-container .subtitle {
    font-size: 0.95rem;
    color: #888;
    margin-bottom: 2rem;
}

.upload-area {
    position: relative;
    width: 360px;
    padding: 50px 40px;
    border: 2px dashed #444;
    background: #1a1a1a;
    cursor: pointer;
    transition: all 0.2s ease;
}

.upload-area:hover {
    border-color: #888;
    background: #222;
}

.upload-area.dragover {
    border-color: #fff;
    background: #2a2a2a;
}

.upload-area input[type="file"] {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    cursor: pointer;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    filter: grayscale(1);
}

.upload-area p {
    margin: 0.5rem 0;
    color: #ccc;
}

.upload-area .hint {
    font-size: 0.8rem;
    color: #666;
}

/* ========== Main Screen ========== */
.info-container {
    position: absolute;
    top: 10px;
    left: 10px;
    display: flex;
    flex-direction: column;
    gap: 8px;
    max-height: calc(100vh - 20px);
    overflow-y: auto;
    z-index: 10;
}

/* Panel */
.panel {
    background: rgba(0, 0, 0, 0.85);
    border: 1px solid #333;
    min-width: 180px;
}

.panel-title {
    background: #222;
    padding: 6px 12px;
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 1px;
    color: #888;
    border-bottom: 1px solid #333;
}

.panel-content {
    padding: 10px 12px;
    font-size: 0.9rem;
}

.panel-content.vertical {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

/* Select Row */
.select-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.select-row label {
    min-width: 20px;
    color: #888;
}

.axis-select {
    flex: 1;
    background: #1a1a1a;
    color: #eee;
    border: 1px solid #444;
    padding: 5px 8px;
    font-size: 0.85rem;
    font-family: inherit;
    cursor: pointer;
    outline: none;
}

.axis-select:hover {
    border-color: #666;
}

.axis-select:focus {
    border-color: #888;
}

/* Checkbox Row */
.checkbox-row {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-row input[type="checkbox"] {
    width: 14px;
    height: 14px;
    cursor: pointer;
    accent-color: #888;
}

.checkbox-row label {
    cursor: pointer;
    font-size: 0.85rem;
}

/* Quality Group */
.quality-group {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 6px;
    padding-top: 8px;
    border-top: 1px solid #333;
}

.quality-group > span {
    font-size: 0.75rem;
    color: #666;
    text-transform: uppercase;
}

/* Class Checkbox */
.class-checkbox-item {
    display: flex;
    align-items: center;
    gap: 8px;
}

.class-checkbox-item input[type="checkbox"] {
    width: 14px;
    height: 14px;
    cursor: pointer;
    accent-color: #888;
}

.class-checkbox-item label {
    cursor: pointer;
    font-size: 0.85rem;
    display: flex;
    align-items: center;
    gap: 6px;
}

.class-color-dot {
    width: 10px;
    height: 10px;
    border-radius: 50%;
    border: 1px solid #555;
}

/* Prediction */
#prediction {
    font-weight: bold;
    padding: 3px 10px;
    border-radius: 3px;
    min-width: 40px;
    text-align: center;
}

#k-number {
    font-weight: bold;
    color: #fff;
}

#file-name {
    color: #aaa;
    font-size: 0.85rem;
    word-break: break-all;
}

/* Button */
.btn {
    background: #333;
    color: #eee;
    border: 1px solid #555;
    padding: 8px 16px;
    font-family: inherit;
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s;
}

.btn:hover {
    background: #444;
    border-color: #777;
}

/* Right Controls */
#right-controls {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 10;
}

/* Loading */
#loading {
    display: flex;
    align-items: center;
    gap: 10px;
    position: absolute;
    bottom: 10px;
    right: 10px;
    background: rgba(0, 0, 0, 0.9);
    border: 1px solid #444;
    padding: 12px 16px;
    font-size: 0.9rem;
    opacity: 0;
    transition: opacity 0.2s;
    z-index: 100;
    pointer-events: none;
}

#loading.visible {
    opacity: 1;
}

/* CSS Spinner */
.spinner {
    width: 18px;
    height: 18px;
    border: 2px solid #444;
    border-top-color: #fff;
    border-radius: 50%;
    animation: spin 0.8s linear infinite;
}

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

.svg {
    width: 18px;
    height: 18px;
    filter: invert(1);
}

/* Scrollbar */
.info-container::-webkit-scrollbar {
    width: 6px;
}

.info-container::-webkit-scrollbar-track {
    background: #111;
}

.info-container::-webkit-scrollbar-thumb {
    background: #444;
}

.info-container::-webkit-scrollbar-thumb:hover {
    background: #555;
}

/* Responsive */
@media screen and (max-width: 768px) {
    .panel {
        min-width: 160px;
    }

    .panel-content {
        font-size: 0.85rem;
    }

    .upload-area {
        width: 300px;
        padding: 40px 30px;
    }

    .upload-container h1 {
        font-size: 2rem;
    }
}