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

:root {
    --primary-color: #667eea;
    --primary-dark: #5568d3;
    --secondary-color: #764ba2;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --dark: #1f2937;
    --gray: #6b7280;
    --light-gray: #f3f4f6;
    --border: #e5e7eb;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--dark);
    line-height: 1.6;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
.header {
    text-align: center;
    color: white;
    margin-bottom: 30px;
    animation: fadeInDown 0.6s ease;
}

.logo {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
    margin-bottom: 10px;
}

.logo svg {
    color: white;
    filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.2));
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.subtitle {
    font-size: 1.1rem;
    opacity: 0.95;
    margin-top: 5px;
}

/* Upload Section */
.upload-section {
    animation: fadeIn 0.8s ease;
}

.upload-area {
    background: white;
    border-radius: 16px;
    padding: 60px 40px;
    text-align: center;
    border: 3px dashed var(--border);
    transition: all 0.3s ease;
    cursor: pointer;
    position: relative;
}

.upload-area:hover {
    border-color: var(--primary-color);
    background: #fafafa;
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.upload-area.drag-over {
    border-color: var(--primary-color);
    background: #f0f4ff;
    border-style: solid;
}

.upload-icon {
    color: var(--primary-color);
    margin-bottom: 20px;
    animation: float 3s ease-in-out infinite;
}

.upload-area h2 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--dark);
}

.upload-area p {
    color: var(--gray);
    margin: 10px 0;
}

.browse-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    padding: 14px 32px;
    border-radius: 8px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: 20px 0;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
}

.browse-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.5);
}

.file-info {
    font-size: 0.9rem;
    color: var(--gray);
    margin-top: 10px;
}

/* Editor Section */
.editor-section {
    animation: fadeIn 0.6s ease;
}

.editor-container {
    display: grid;
    grid-template-columns: 320px 1fr;
    gap: 20px;
    background: white;
    border-radius: 16px;
    padding: 20px;
    box-shadow: var(--shadow-lg);
}

/* Controls Panel */
.controls-panel {
    background: var(--light-gray);
    border-radius: 12px;
    padding: 20px;
    height: fit-content;
    position: sticky;
    top: 20px;
    max-height: calc(100vh - 40px);
    overflow-y: auto;
}

.controls-panel::-webkit-scrollbar {
    width: 6px;
}

.controls-panel::-webkit-scrollbar-track {
    background: #e5e7eb;
    border-radius: 3px;
}

.controls-panel::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 3px;
}

.controls-panel h3 {
    font-size: 1.3rem;
    margin-bottom: 20px;
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 10px;
}

.control-group {
    margin-bottom: 25px;
}

.control-group label {
    display: flex;
    align-items: center;
    justify-content: space-between;
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark);
    font-size: 0.95rem;
}

.control-group label svg {
    margin-right: 8px;
}

.control-group .value {
    background: var(--primary-color);
    color: white;
    padding: 2px 10px;
    border-radius: 12px;
    font-size: 0.85rem;
    min-width: 45px;
    text-align: center;
}

input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: #ddd;
    outline: none;
    -webkit-appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
    transition: all 0.2s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    cursor: pointer;
    border: none;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.2);
}

.hint {
    display: block;
    font-size: 0.8rem;
    color: var(--gray);
    margin-top: 5px;
    font-style: italic;
}

/* Action Buttons */
.action-buttons {
    display: flex;
    flex-direction: column;
    gap: 10px;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid var(--border);
}

.btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 12px 20px;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-size: 0.95rem;
    cursor: pointer;
    transition: all 0.3s ease;
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(102, 126, 234, 0.4);
}

.btn-secondary {
    background: white;
    color: var(--dark);
    border: 2px solid var(--border);
}

.btn-secondary:hover {
    background: var(--light-gray);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

/* Presets */
.presets {
    margin-top: 25px;
    padding-top: 20px;
    border-top: 2px solid var(--border);
}

.presets h4 {
    font-size: 1rem;
    margin-bottom: 12px;
    color: var(--dark);
}

.preset-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
}

.preset-btn {
    padding: 10px;
    border: 2px solid var(--border);
    background: white;
    border-radius: 8px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
    font-family: inherit;
}

.preset-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
    transform: translateY(-1px);
}

/* Canvas Area */
.canvas-area {
    display: flex;
    flex-direction: column;
}

.canvas-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
    padding-bottom: 15px;
    border-bottom: 2px solid var(--border);
}

.canvas-header h3 {
    font-size: 1.3rem;
    color: var(--dark);
}

.zoom-controls {
    display: flex;
    align-items: center;
    gap: 10px;
}

.zoom-btn {
    width: 36px;
    height: 36px;
    border: 2px solid var(--border);
    background: white;
    border-radius: 6px;
    cursor: pointer;
    font-weight: bold;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.zoom-btn:hover {
    background: var(--primary-color);
    color: white;
    border-color: var(--primary-color);
}

#zoomFit {
    width: auto;
    padding: 0 12px;
    font-size: 0.9rem;
}

#zoomLevel {
    font-weight: 600;
    color: var(--dark);
    min-width: 50px;
    text-align: center;
}

.canvas-wrapper {
    flex: 1;
    background: #fafafa;
    border-radius: 12px;
    border: 2px solid var(--border);
    overflow: auto;
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 500px;
    position: relative;
    padding: 20px;
}

.canvas-wrapper::-webkit-scrollbar {
    width: 10px;
    height: 10px;
}

.canvas-wrapper::-webkit-scrollbar-track {
    background: #f1f1f1;
}

.canvas-wrapper::-webkit-scrollbar-thumb {
    background: #888;
    border-radius: 5px;
}

.canvas-wrapper::-webkit-scrollbar-thumb:hover {
    background: #555;
}

#canvas {
    max-width: 100%;
    max-height: 100%;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
    border-radius: 4px;
    background: white;
    transition: transform 0.3s ease;
}

.canvas-info {
    display: flex;
    justify-content: space-between;
    margin-top: 10px;
    font-size: 0.9rem;
    color: var(--gray);
    padding: 10px;
    background: var(--light-gray);
    border-radius: 6px;
}

/* Footer */
.footer {
    text-align: center;
    color: white;
    padding: 20px;
    margin-top: 30px;
    font-size: 0.9rem;
    opacity: 0.9;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0px);
    }
    50% {
        transform: translateY(-10px);
    }
}

/* Responsive Design */
@media (max-width: 1024px) {
    .editor-container {
        grid-template-columns: 1fr;
    }

    .controls-panel {
        position: relative;
        top: 0;
        max-height: none;
    }
}

@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }

    .upload-area {
        padding: 40px 20px;
    }

    .editor-container {
        padding: 15px;
    }

    .controls-panel {
        padding: 15px;
    }

    .preset-buttons {
        grid-template-columns: 1fr;
    }

    .canvas-wrapper {
        min-height: 300px;
    }

    .canvas-info {
        flex-direction: column;
        gap: 5px;
    }
}

/* Loading Spinner */
.loading {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 3px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 1s linear infinite;
}

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

/* Tooltips */
[title] {
    position: relative;
    cursor: help;
}

/* Success/Error Messages */
.message {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 16px 24px;
    border-radius: 8px;
    color: white;
    font-weight: 500;
    box-shadow: var(--shadow-lg);
    z-index: 1000;
    animation: slideInRight 0.3s ease;
}

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

.message.error {
    background: var(--danger-color);
}

@keyframes slideInRight {
    from {
        transform: translateX(400px);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}