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

:root {
    --primary-bg: #000000;
    --secondary-bg: #111111;
    --tertiary-bg: #1a1a1a;
    --accent: #ffffff;
    --text-primary: #e0e0e0;
    --text-secondary: #a0a0a0;
    --text-muted: #707070;
    --border-color: #333333;
    --success: #4caf50;
    --warning: #ff9800;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--primary-bg);
    color: var(--text-primary);
    min-height: 100vh;
    padding: 10px;
    line-height: 1.4;
    overflow-x: hidden;
}

.container {
    max-width: 1600px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    min-height: calc(100vh - 20px);
}

header {
    padding: 8px 0;
    text-align: center;
    flex-shrink: 0;
}

h1 {
    font-size: clamp(1.2rem, 2.5vw, 1.6rem);
    font-weight: 600;
    color: var(--accent);
    letter-spacing: -0.3px;
}

.mode-tabs {
    display: flex;
    gap: 6px;
    margin: 8px 0;
    flex-wrap: wrap;
    justify-content: center;
    flex-shrink: 0;
}

.tab-btn {
    padding: 6px 12px;
    background: var(--secondary-bg);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.8em;
    font-weight: 500;
    transition: all 0.2s ease;
    font-family: inherit;
}

.tab-btn:hover {
    background: var(--tertiary-bg);
    border-color: #444;
    transform: translateY(-1px);
}

.tab-btn.active {
    background: var(--accent);
    color: var(--primary-bg);
    border-color: var(--accent);
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.15);
}

.main-grid {
    display: grid;
    grid-template-columns: 260px 1fr;
    gap: 10px;
    flex: 1;
    min-height: 0;
    margin-bottom: 8px;
}

.sidebar {
    display: flex;
    flex-direction: column;
    height: fit-content;
    max-height: calc(100vh - 180px);
    overflow: visible;
}

.canvas-section {
    display: flex;
    flex-direction: column;
    min-height: 400px;
}

.upload-area {
    background: var(--secondary-bg);
    border: 1px dashed var(--border-color);
    border-radius: 6px;
    padding: 16px 10px;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    margin-bottom: 10px;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.upload-area::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, rgba(255, 255, 255, 0.05) 0%, rgba(160, 160, 160, 0.05) 100%);
    opacity: 0;
    transition: opacity 0.2s;
}

.upload-area:hover::before {
    opacity: 1;
}

.upload-area:hover {
    border-color: #555;
    background: var(--tertiary-bg);
    transform: translateY(-1px);
}

.upload-area.drag-over {
    border-color: var(--accent);
    background: var(--tertiary-bg);
    transform: scale(1.01);
}

.upload-area.webcam-area {
    cursor: default;
}

.upload-icon {
    font-size: 2em;
    margin-bottom: 8px;
    opacity: 0.6;
}

.upload-text {
    font-size: 0.85em;
    color: var(--accent);
    margin-bottom: 4px;
    font-weight: 500;
}

.upload-subtext {
    color: var(--text-secondary);
    font-size: 0.7em;
}

#fileInput, #videoInput {
    display: none;
}

.controls {
    background: var(--secondary-bg);
    border-radius: 6px;
    padding: 10px;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    overflow-y: auto;
    max-height: calc(100vh - 360px);
}

.controls::-webkit-scrollbar {
    width: 4px;
}

.controls::-webkit-scrollbar-track {
    background: var(--tertiary-bg);
    border-radius: 2px;
}

.controls::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 2px;
}

.control-group {
    margin-bottom: 10px;
}

.control-group:last-child {
    margin-bottom: 0;
}

.control-label {
    display: block;
    font-size: 0.75em;
    color: var(--text-secondary);
    margin-bottom: 6px;
    font-weight: 500;
}

input[type="range"] {
    width: 100%;
    height: 3px;
    background: var(--tertiary-bg);
    border-radius: 2px;
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.2s;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

input[type="range"]::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all 0.2s;
}

input[type="range"]::-moz-range-thumb:hover {
    transform: scale(1.1);
    box-shadow: 0 0 8px rgba(255, 255, 255, 0.3);
}

.slider-value {
    display: inline-block;
    background: var(--tertiary-bg);
    padding: 2px 6px;
    border-radius: 3px;
    font-size: 0.75em;
    color: var(--accent);
    min-width: 35px;
    text-align: center;
}

.button-group {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 6px;
    margin-bottom: 8px;
}

.color-btn {
    padding: 6px;
    background: var(--tertiary-bg);
    border: 1px solid var(--tertiary-bg);
    border-radius: 4px;
    color: var(--text-secondary);
    cursor: pointer;
    font-size: 0.75em;
    font-weight: 500;
    transition: all 0.2s ease;
    font-family: inherit;
}

.color-btn:hover {
    background: #333;
    border-color: var(--border-color);
    transform: translateY(-1px);
}

.color-btn.active {
    background: var(--accent);
    color: var(--primary-bg);
    border-color: var(--accent);
    box-shadow: 0 2px 8px rgba(255, 255, 255, 0.15);
}

select {
    width: 100%;
    padding: 6px;
    background: var(--tertiary-bg);
    border: 1px solid var(--tertiary-bg);
    border-radius: 4px;
    color: var(--accent);
    font-size: 0.75em;
    cursor: pointer;
    font-family: inherit;
    outline: none;
    transition: all 0.2s;
}

select:hover {
    background: #333;
    border-color: var(--border-color);
}

select:focus {
    border-color: #555;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.1);
}

.action-btn {
    width: 100%;
    padding: 8px;
    background: var(--accent);
    color: var(--primary-bg);
    border: none;
    border-radius: 4px;
    font-size: 0.8em;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    font-family: inherit;
}

.action-btn:hover {
    background: #e0e0e0;
    transform: translateY(-1px);
}

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

.action-btn:disabled {
    background: var(--tertiary-bg);
    color: var(--text-muted);
    cursor: not-allowed;
    transform: none;
}

.canvas-container {
    background: #000;
    border-radius: 6px;
    padding: 12px;
    overflow: auto;
    min-height: 300px;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    transition: all 0.2s ease;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
    flex: 1;
}

.canvas-container.empty {
    border: 1px dashed var(--border-color);
    background: var(--primary-bg);
}

.canvas-container.fullscreen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100vw;
    height: 100vh;
    z-index: 1000;
    padding: 60px 15px 15px;
    border-radius: 0;
    overflow: auto;
    background: #000;
}

.canvas-wrapper {
    display: inline-block;
    position: relative;
    transform-origin: center center;
    transition: transform 0.2s ease;
    cursor: grab;
}

.canvas-wrapper.dragging {
    cursor: grabbing;
}

.empty-state {
    text-align: center;
    color: var(--text-muted);
}

.empty-state-icon {
    font-size: 3em;
    margin-bottom: 8px;
    opacity: 0.3;
}

.empty-state-text {
    font-size: 0.9em;
}

canvas {
    display: block;
    max-width: 100%;
    height: auto;
    image-rendering: pixelated;
    transition: all 0.2s ease;
    border-radius: 4px;
}

#videoSource {
    display: none;
}

.video-controls {
    display: flex;
    gap: 6px;
    padding: 8px 12px;
    background: var(--secondary-bg);
    border-radius: 4px;
    margin-top: 8px;
    align-items: center;
    flex-wrap: wrap;
}

.video-btn {
    padding: 6px 12px;
    background: var(--tertiary-bg);
    border: none;
    border-radius: 4px;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.75em;
    font-weight: 500;
    transition: all 0.2s ease;
    font-family: inherit;
}

.video-btn:hover {
    background: #333;
    transform: translateY(-1px);
}

.video-btn.playing {
    background: var(--success);
    color: white;
}

.video-btn:disabled {
    background: var(--tertiary-bg);
    color: var(--text-muted);
    cursor: not-allowed;
}

.fps-display {
    margin-left: auto;
    color: var(--text-secondary);
    font-size: 0.75em;
}

.info-bar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 8px;
    padding: 8px 12px;
    background: var(--secondary-bg);
    border-radius: 4px;
    font-size: 0.7em;
    color: var(--text-secondary);
    flex-wrap: wrap;
    gap: 6px;
}

.content-section {
    display: none;
}

.content-section.active {
    display: block;
}

.canvas-controls {
    display: flex;
    gap: 6px;
    margin-top: 8px;
    justify-content: flex-end;
    flex-wrap: wrap;
}

.canvas-btn {
    padding: 6px 12px;
    background: var(--tertiary-bg);
    border: none;
    border-radius: 4px;
    color: var(--accent);
    cursor: pointer;
    font-size: 0.75em;
    font-weight: 500;
    transition: all 0.2s ease;
    font-family: inherit;
}

.canvas-btn:hover {
    background: #333;
    transform: translateY(-1px);
}

.canvas-btn:disabled {
    background: var(--tertiary-bg);
    color: var(--text-muted);
    cursor: not-allowed;
}

.processing-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    border-radius: 6px;
    z-index: 10;
    display: none;
    flex-direction: column;
    color: white;
    backdrop-filter: blur(5px);
}

.spinner {
    width: 30px;
    height: 30px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--accent);
    animation: spin 1s ease-in-out infinite;
    margin-bottom: 12px;
}

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

.fullscreen-header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    padding: 10px 12px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1001;
    display: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.fullscreen-title {
    color: var(--accent);
    font-weight: 600;
    font-size: 0.9em;
}

.fullscreen-controls {
    display: flex;
    align-items: center;
    gap: 12px;
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 6px;
    background: rgba(255, 255, 255, 0.1);
    padding: 3px 6px;
    border-radius: 4px;
}

.zoom-btn {
    background: rgba(255, 255, 255, 0.2);
    border: none;
    color: var(--accent);
    width: 24px;
    height: 24px;
    border-radius: 3px;
    cursor: pointer;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
}

.zoom-btn:hover {
    background: rgba(255, 255, 255, 0.3);
    transform: scale(1.1);
}

.zoom-level {
    color: var(--accent);
    font-size: 0.75em;
    font-weight: 500;
    min-width: 40px;
    text-align: center;
}

.fullscreen-close {
    background: rgba(244, 67, 54, 0.8);
    border: none;
    color: white;
    padding: 5px 10px;
    border-radius: 4px;
    cursor: pointer;
    font-family: inherit;
    transition: all 0.2s ease;
    font-weight: 500;
    font-size: 0.8em;
}

.fullscreen-close:hover {
    background: rgba(244, 67, 54, 1);
    transform: translateY(-1px);
}

.footer {
    text-align: center;
    padding: 8px 0;
    margin-top: 8px;
    border-top: 1px solid var(--border-color);
    flex-shrink: 0;
}

.footer p {
    color: var(--text-secondary);
    font-size: 0.75em;
    margin: 2px 0;
}

.footer .copyright {
    color: var(--text-muted);
    font-size: 0.7em;
}

.toast {
    position: fixed;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.9);
    color: var(--accent);
    padding: 8px 16px;
    border-radius: 4px;
    font-size: 0.75em;
    z-index: 1000;
    opacity: 0;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

.toast.show {
    opacity: 1;
    transform: translateX(-50%) translateY(-8px);
}

.toast.success {
    background: var(--success);
    color: white;
}

.toast.error {
    background: #f44336;
    color: white;
}

@media (max-width: 900px) {
    .main-grid {
        grid-template-columns: 1fr;
        gap: 10px;
    }

    .sidebar {
        max-height: none;
        order: 2;
    }

    .canvas-section {
        order: 1;
    }

    .controls {
        max-height: none;
    }
}

@media (max-width: 768px) {
    body {
        padding: 8px;
    }

    h1 {
        font-size: 1.3rem;
    }

    .main-grid {
        gap: 8px;
    }

    .canvas-container {
        padding: 10px;
        min-height: 250px;
    }

    .canvas-container.fullscreen {
        padding: 50px 10px 10px;
    }

    .video-controls, .canvas-controls {
        justify-content: center;
    }

    .button-group {
        grid-template-columns: 1fr;
    }

    .info-bar {
        justify-content: center;
        text-align: center;
    }

    .fullscreen-header {
        padding: 8px 10px;
    }

    .fullscreen-title {
        font-size: 0.8em;
    }
}

@media (max-width: 480px) {
    .controls {
        padding: 10px 8px;
    }

    .upload-area {
        padding: 18px 10px;
    }

    .fullscreen-controls {
        gap: 8px;
    }
}