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

:root {
    --primary-color: #2196F3;
    --secondary-color: #4CAF50;
    --accent-color: #FF5722;
    --bg-primary: #0f1419;
    --bg-secondary: #1a1f2e;
    --bg-tertiary: #242937;
    --text-primary: #e7e9ea;
    --text-secondary: #8b98a5;
    --border-color: #2f3336;
    --hover-bg: rgba(255, 255, 255, 0.08);
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-lg: 0 10px 20px rgba(0, 0, 0, 0.4);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    overflow: hidden;
    user-select: none;
}

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

.app-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.75rem 1.5rem;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
}

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

.logo h1 {
    font-size: 1.25rem;
    font-weight: 600;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.main-nav {
    display: flex;
    gap: 0.5rem;
}

.nav-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background: transparent;
    border: 1px solid transparent;
    border-radius: 8px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
}

.nav-btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
}

.nav-btn.active {
    background: var(--bg-tertiary);
    border-color: var(--primary-color);
    color: var(--primary-color);
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
}

.control-select {
    padding: 0.375rem 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    cursor: pointer;
    transition: border-color 0.2s ease;
}

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

.icon-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: transparent;
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
}

.icon-btn:hover {
    background: var(--hover-bg);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

.workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
}

.canvas-container {
    flex: 1;
    position: relative;
    background: var(--bg-primary);
    background-image: 
        linear-gradient(rgba(255, 255, 255, 0.01) 1px, transparent 1px),
        linear-gradient(90deg, rgba(255, 255, 255, 0.01) 1px, transparent 1px);
    background-size: 50px 50px;
}

#measurement-canvas {
    position: absolute;
    top: 0;
    left: 0;
    cursor: crosshair;
}

.measurement-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
}

.cursor-info {
    position: absolute;
    top: 1rem;
    left: 1rem;
    display: flex;
    gap: 1rem;
    padding: 0.75rem 1rem;
    background: rgba(26, 31, 46, 0.95);
    backdrop-filter: blur(10px);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    font-size: 0.875rem;
    font-family: 'Monaco', 'Menlo', monospace;
    box-shadow: var(--shadow-md);
}

.info-item {
    display: flex;
    align-items: center;
    gap: 0.25rem;
}

.info-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.color-info {
    gap: 0.5rem;
}

.color-preview {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.tools-panel {
    width: 320px;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    overflow-y: auto;
}

.panel-section {
    padding: 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.panel-section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.panel-section h4 {
    font-size: 0.875rem;
    font-weight: 500;
    margin: 1rem 0 0.5rem;
    color: var(--text-secondary);
}

.control-group {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.control-group label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    min-width: 80px;
}

.control-group input[type="range"] {
    flex: 1;
    -webkit-appearance: none;
    appearance: none;
    height: 4px;
    background: var(--bg-tertiary);
    border-radius: 2px;
    outline: none;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
}

.control-group input[type="number"] {
    width: 80px;
    padding: 0.375rem 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
}

.control-group input[type="color"] {
    width: 50px;
    height: 32px;
    padding: 2px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    cursor: pointer;
}

.checkbox-group {
    margin-bottom: 0.75rem;
}

.checkbox-group label {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    accent-color: var(--primary-color);
}

.measurements-list {
    margin-top: 1rem;
}

#measurements-container {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.measurement-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border-radius: 6px;
    font-size: 0.875rem;
}

.measurement-value {
    font-family: 'Monaco', 'Menlo', monospace;
    color: var(--primary-color);
}

.remove-btn {
    width: 24px;
    height: 24px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    cursor: pointer;
    border-radius: 4px;
    transition: all 0.2s ease;
}

.remove-btn:hover {
    background: var(--hover-bg);
    color: var(--accent-color);
}

.angle-display {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 1.5rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    margin-top: 1rem;
}

.angle-value {
    font-size: 2rem;
    font-weight: bold;
    color: var(--secondary-color);
}

.angle-radians {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

.color-display {
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: 8px;
    margin-bottom: 1rem;
}

.color-preview-large {
    width: 100%;
    height: 80px;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    margin-bottom: 1rem;
}

.color-values {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    font-size: 0.875rem;
    font-family: 'Monaco', 'Menlo', monospace;
}

.color-values div {
    display: flex;
    justify-content: space-between;
    color: var(--text-secondary);
}

.color-values span {
    color: var(--text-primary);
}

#color-history-container {
    display: grid;
    grid-template-columns: repeat(8, 1fr);
    gap: 0.5rem;
}

.color-history-item {
    width: 28px;
    height: 28px;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.color-history-item:hover {
    transform: scale(1.1);
    border-color: var(--primary-color);
}

.action-buttons {
    padding: 1.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    margin-top: auto;
}

.action-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s ease;
    font-size: 0.875rem;
    font-weight: 500;
}

.action-btn:hover {
    background: var(--hover-bg);
    border-color: var(--primary-color);
}

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

.action-btn.primary:hover {
    background: #1976D2;
    border-color: #1976D2;
}

.shortcuts-help {
    position: fixed;
    bottom: 1rem;
    right: 1rem;
}

.shortcuts-toggle {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-md);
}

.shortcuts-toggle:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border-color: var(--primary-color);
}

.shortcuts-panel {
    position: absolute;
    bottom: 50px;
    right: 0;
    width: 250px;
    padding: 1rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    box-shadow: var(--shadow-lg);
}

.shortcuts-panel h4 {
    margin-bottom: 0.75rem;
    color: var(--text-primary);
}

.shortcut-item {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 0.5rem;
    font-size: 0.875rem;
}

.shortcut-item kbd {
    padding: 0.25rem 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 0.75rem;
    color: var(--text-primary);
}

.shortcut-item span {
    color: var(--text-secondary);
}

/* レスポンシブ対応 */
@media (max-width: 768px) {
    .tools-panel {
        position: fixed;
        right: -320px;
        top: 0;
        bottom: 0;
        z-index: 1000;
        transition: right 0.3s ease;
    }
    
    .tools-panel.open {
        right: 0;
    }
    
    .main-nav {
        flex-wrap: wrap;
    }
    
    .nav-btn span {
        display: none;
    }
}

/* スクロールバーのスタイリング */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--bg-tertiary);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--border-color);
}