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

/* Prevent browser dark mode interference */
html {
    color-scheme: light dark;
}

/* Force our theme system to take precedence over browser dark mode */
html[data-theme="light"] {
    color-scheme: light only;
}

html[data-theme="dark"] {
    color-scheme: dark only;
}

/* Prevent browser from auto-darkening form elements */
input, textarea, select, button {
    color-scheme: inherit;
}

/* CSS Variables for Theme System */
:root {
    --bg-primary: #f5f5f5;
    --bg-secondary: #ffffff;
    --bg-tertiary: #f8f9fa;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-tertiary: #999999;
    --border-primary: #e0e0e0;
    --border-secondary: #ccc;
    --border-tertiary: #d0d0d0;
    --accent-primary: #007acc;
    --accent-secondary: #005a9f;
    --accent-success: #28a745;
    --accent-success-hover: #218838;
    --shadow-light: rgba(0, 0, 0, 0.1);
    --shadow-medium: rgba(0, 0, 0, 0.15);
    --hover-bg: #f0f0f0;
    --hover-border: #d0d0d0;
    --disabled-opacity: 0.5;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-primary: #1a1a1a;
    --bg-secondary: #2d2d2d;
    --bg-tertiary: #3a3a3a;
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-tertiary: #999999;
    --border-primary: #404040;
    --border-secondary: #555555;
    --border-tertiary: #666666;
    --accent-primary: #4da6ff;
    --accent-secondary: #0080ff;
    --accent-success: #4caf50;
    --accent-success-hover: #45a049;
    --shadow-light: rgba(0, 0, 0, 0.3);
    --shadow-medium: rgba(0, 0, 0, 0.5);
    --hover-bg: #404040;
    --hover-border: #555555;
    --disabled-opacity: 0.4;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-primary) !important;
    color: var(--text-primary) !important;
    overflow: hidden;
    transition: background-color 0.3s ease, color 0.3s ease;
    /* Ensure browser dark mode doesn't interfere */
    -webkit-text-fill-color: var(--text-primary);
}

/* Prevent browser dark mode from affecting our elements */
*, *::before, *::after {
    background-color: inherit;
    color: inherit;
    border-color: inherit;
}

/* Override browser dark mode for specific elements */
input, textarea, select, button, canvas {
    background-color: var(--bg-secondary) !important;
    color: var(--text-primary) !important;
    border-color: var(--border-primary) !important;
}

/* Make sure form elements follow our theme */
input:not([type="color"]), textarea, select {
    background: var(--bg-secondary) !important;
    color: var(--text-primary) !important;
    border: 1px solid var(--border-primary) !important;
}

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

/* Header Styles */
.app-header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 12px 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    box-shadow: 0 2px 8px var(--shadow-medium);
}

.app-header h1 {
    font-size: 24px;
    font-weight: 600;
    margin: 0;
}

.header-controls {
    display: flex;
    align-items: center;
    gap: 20px;
}

.header-info {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    font-size: 12px;
    opacity: 0.9;
}

#filename {
    font-weight: 500;
    margin-bottom: 2px;
}

#autosave-status {
    font-size: 11px;
    opacity: 0.8;
}

/* Theme Toggle Button */
.theme-toggle {
    background: rgba(255, 255, 255, 0.2);
    border: 1px solid rgba(255, 255, 255, 0.3);
    border-radius: 20px;
    padding: 6px 12px;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 6px;
    font-size: 12px;
    font-weight: 500;
    transition: all 0.2s ease;
    backdrop-filter: blur(10px);
}

.theme-toggle:hover {
    background: rgba(255, 255, 255, 0.3);
    border-color: rgba(255, 255, 255, 0.4);
    transform: translateY(-1px);
}

.theme-toggle svg {
    width: 14px;
    height: 14px;
    transition: transform 0.3s ease;
}

.theme-toggle[data-theme="dark"] svg {
    transform: rotate(180deg);
}

/* Toolbar Styles */
.toolbar {
    background-color: var(--bg-secondary);
    border-bottom: 1px solid var(--border-primary);
    padding: 8px 12px;
    display: flex;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    box-shadow: 0 2px 4px var(--shadow-light);
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.tool-group {
    display: flex;
    align-items: center;
    gap: 4px;
    padding: 0 8px;
    border-right: 1px solid var(--border-primary);
}

.tool-group:last-child {
    border-right: none;
}

.tool-btn, .action-btn {
    background: none;
    border: 1px solid transparent;
    border-radius: 6px;
    padding: 8px 12px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease;
    color: var(--text-primary);
    gap: 6px;
    font-size: 13px;
    font-weight: 500;
}

.tool-btn svg, .action-btn svg {
    flex-shrink: 0;
}

.tool-btn:hover, .action-btn:hover {
    background-color: var(--hover-bg);
    border-color: var(--hover-border);
    transform: translateY(-1px);
}

.tool-btn.active {
    background-color: var(--accent-primary);
    color: white;
    border-color: var(--accent-secondary);
    box-shadow: 0 2px 4px rgba(0, 122, 204, 0.3);
}

.tool-btn:disabled, .action-btn:disabled {
    opacity: var(--disabled-opacity);
    cursor: not-allowed;
    transform: none;
}

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

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

#export-btn {
    background-color: var(--accent-success);
    color: white;
    border-color: var(--accent-success);
}

#export-btn:hover {
    background-color: var(--accent-success-hover);
    border-color: var(--accent-success-hover);
}

/* Form Controls */
label {
    font-size: 12px;
    color: var(--text-secondary);
    margin-right: 4px;
    font-weight: 500;
}

select, input[type="color"] {
    border: 1px solid var(--border-secondary);
    border-radius: 4px;
    padding: 6px;
    font-size: 12px;
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    transition: all 0.2s ease;
}

select:focus, input[type="color"]:focus {
    outline: none;
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(77, 166, 255, 0.2);
}

select {
    cursor: pointer;
}

input[type="color"] {
    width: 32px;
    height: 32px;
    padding: 2px;
    cursor: pointer;
}

/* Canvas Container */
.canvas-container {
    flex: 1;
    overflow: hidden;
    position: relative; /* Add relative positioning for absolute ad positioning */
    padding: 10px;
    cursor: pointer;
    border-radius: 6px;
    background-color: var(--bg-secondary);
    background-image: 
        radial-gradient(circle, var(--border-primary) 1px, transparent 1px);
    background-size: 20px 20px;
    transition: background-color 0.3s ease;
}

#canvas {
    display: block;
    cursor: crosshair;
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    border-radius: 8px;
    width: 100%;
    height: 100%;
    box-shadow: 0 4px 12px var(--shadow-light);
    transition: background-color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

#canvas.select-mode {
    cursor: default;
}

#canvas.hand-mode {
    cursor: grab;
}

#canvas.text-mode {
    cursor: text;
}

#canvas.pen-mode {
    cursor: crosshair;
}

#canvas.eraser-mode {
    cursor: cell;
}

/* Footer Styles */
.app-footer {
    background-color: #f8f9fa;
    border-top: 1px solid #e0e0e0;
    padding: 8px 20px;
    text-align: center;
    font-size: 12px;
    color: #666;
}

.app-footer p {
    transition: opacity 0.5s ease-in-out;
    margin: 0;
    min-height: 14px; /* Prevent layout shift */
}

.app-footer a {
    color: #007acc;
    text-decoration: none;
}

.app-footer a:hover {
    text-decoration: underline;
}

/* Modal Styles */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    backdrop-filter: blur(4px);
}

.modal-content {
    background-color: white;
    padding: 24px;
    border-radius: 12px;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
    min-width: 350px;
    max-width: 90vw;
}

#text-input {
    width: 100%;
    border: 2px solid #e0e0e0;
    border-radius: 6px;
    padding: 12px;
    font-family: inherit;
    font-size: 14px;
    resize: vertical;
    margin-bottom: 16px;
    transition: border-color 0.2s ease;
}

#text-input:focus {
    outline: none;
    border-color: #007acc;
}

.modal-buttons {
    display: flex;
    gap: 12px;
    justify-content: flex-end;
}

.modal-buttons button {
    background-color: #007acc;
    color: white;
    border: none;
    border-radius: 6px;
    padding: 10px 20px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
}

.modal-buttons button:hover {
    background-color: #005a9f;
    transform: translateY(-1px);
}

.modal-buttons button:last-child {
    background-color: #6c757d;
}

.modal-buttons button:last-child:hover {
    background-color: #5a6268;
}

/* Selection indicators */
.selection-handle {
    position: absolute;
    width: 8px;
    height: 8px;
    background-color: #007acc;
    border: 2px solid white;
    border-radius: 50%;
    pointer-events: none;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

/* Responsive adjustments */
@media (max-width: 768px) {
    .app-header {
        padding: 8px 12px;
        flex-direction: column;
        gap: 8px;
        text-align: center;
    }
    
    .app-header h1 {
        font-size: 20px;
    }
    
    .header-info {
        align-items: center;
    }
    
    .toolbar {
        flex-wrap: wrap;
        padding: 4px 8px;
        gap: 8px;
    }
    
    .tool-group {
        gap: 2px;
        padding: 0 4px;
    }
    
    .tool-btn, .action-btn {
        padding: 6px 8px;
        font-size: 12px;
    }
    
    .tool-btn span, .action-btn span {
        display: none;
    }
    
    label {
        display: none;
    }
    
    #canvas {
        margin: 10px;
    }
}

@media (max-width: 480px) {
    .tool-group {
        border-right: none;
        padding: 2px;
    }
    
    .toolbar {
        gap: 4px;
    }
    
    .tool-btn, .action-btn {
        padding: 4px 6px;
    }
}

/* Scrollbars */
.canvas-container::-webkit-scrollbar {
    width: 12px;
    height: 12px;
}

.canvas-container::-webkit-scrollbar-track {
    background: #f8f9fa;
    border-radius: 6px;
}

.canvas-container::-webkit-scrollbar-thumb {
    background: #dee2e6;
    border-radius: 6px;
    border: 2px solid #f8f9fa;
}

.canvas-container::-webkit-scrollbar-thumb:hover {
    background: #adb5bd;
}

/* Loading animation */
@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* Success/Error notifications */
.notification {
    position: fixed;
    top: 20px;
    right: 20px;
    padding: 12px 20px;
    border-radius: 6px;
    color: white;
    font-size: 14px;
    font-weight: 500;
    z-index: 1100;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
    transform: translateX(400px);
    transition: transform 0.3s ease;
}

.notification.show {
    transform: translateX(0);
}

.notification.success {
    background-color: #28a745;
}

.notification.error {
    background-color: #dc3545;
}

.notification.info {
    background-color: #17a2b8;
}

/* Dark mode support */
@media (prefers-color-scheme: dark) {
    body {
        background-color: #1a1a1a;
        color: #ffffff;
    }
    
    .toolbar {
        background-color: #2d2d2d;
        border-bottom-color: #404040;
    }
    
    .tool-btn, .action-btn {
        color: #ffffff;
    }
    
    .tool-btn:hover, .action-btn:hover {
        background-color: #404040;
        border-color: #606060;
    }
    
    .canvas-container {
        background-color: #2d2d2d;
    }
    
    #canvas {
        background-color: #ffffff;
    }
    
    .app-footer {
        background-color: #2d2d2d;
        border-top-color: #404040;
        color: #cccccc;
    }
}