/* Design System - Base CSS Custom Properties */
:root {
    /* Neutral Colors - 溫暖石色系統 */
    --neutral-0: #ffffff;
    --neutral-50: #fafaf9;
    --neutral-100: #f5f5f4;
    --neutral-200: #e7e5e4;
    --neutral-300: #d6d3d1;
    --neutral-400: #a8a29e;
    --neutral-500: #78716c;
    --neutral-600: #57534e;
    --neutral-700: #44403c;
    --neutral-800: #292524;
    --neutral-900: #1c1917;
    
    /* Typography Scale */
    --text-xs: 0.75rem;    /* 12px */
    --text-sm: 0.875rem;   /* 14px */
    --text-base: 1rem;     /* 16px */
    --text-lg: 1.125rem;   /* 18px */
    --text-xl: 1.25rem;    /* 20px */
    --text-2xl: 1.5rem;    /* 24px */
    --text-3xl: 1.875rem;  /* 30px */
    --text-4xl: 2.25rem;   /* 36px */
    
    /* Font Weights */
    --font-normal: 400;
    --font-medium: 500;
    --font-semibold: 600;
    --font-bold: 700;
    
    /* Line Heights */
    --leading-tight: 1.25;
    --leading-normal: 1.4;
    --leading-relaxed: 1.6;
    
    /* Spacing Scale */
    --space-0: 0;
    --space-1: 0.25rem;   /* 4px */
    --space-2: 0.5rem;    /* 8px */
    --space-3: 0.75rem;   /* 12px */
    --space-4: 1rem;      /* 16px */
    --space-5: 1.25rem;   /* 20px */
    --space-6: 1.5rem;    /* 24px */
    --space-8: 2rem;      /* 32px */
    --space-10: 2.5rem;   /* 40px */
    --space-12: 3rem;     /* 48px */
    --space-16: 4rem;     /* 64px */
    
    /* Border Radius */
    --rounded-sm: 0.125rem;  /* 2px */
    --rounded: 0.25rem;      /* 4px */
    --rounded-md: 0.375rem;  /* 6px */
    --rounded-lg: 0.5rem;    /* 8px */
    --rounded-xl: 0.75rem;   /* 12px */
    --rounded-2xl: 1rem;     /* 16px */
    --rounded-3xl: 1.5rem;   /* 24px */
    --rounded-full: 50%;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* Transitions */
    --transition-fast: 150ms ease-out;
    --transition-base: 200ms ease-out;
    --transition-slow: 300ms ease-out;
    
    /* Z-index Scale */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal-backdrop: 1040;
    --z-modal: 1050;
    --z-popover: 1060;
    --z-tooltip: 1070;
    --z-toast: 1080;
}

/* Dark Theme Variables */
[data-theme="dark"] {
    --bg-primary: var(--neutral-900);
    --bg-secondary: var(--neutral-800);
    --bg-tertiary: var(--neutral-700);
    --text-primary: var(--neutral-0);
    --text-secondary: var(--neutral-300);
    --text-tertiary: var(--neutral-400);
    --border-primary: var(--neutral-700);
    --border-secondary: var(--neutral-600);
}


/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    font-size: 16px;
    -webkit-text-size-adjust: 100%;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Inter', 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    color: var(--text-primary);
    font-size: var(--text-base);
    font-weight: var(--font-normal);
    line-height: var(--leading-normal);
    overflow-x: hidden;
    -webkit-touch-callout: none;
    -webkit-user-select: none;
    user-select: none;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* App container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    max-width: 100vw;
}

/* 行動版需要底部內距給浮動工具列 */
@media (max-width: 767px) {
    .app-container {
        padding-bottom: calc(var(--space-16) + var(--space-8)); /* Space for floating toolbar */
    }
    
    /* 行動版 Header 緊湊設計 */
    .header {
        padding: var(--space-2) var(--space-4); /* 減少垂直 padding: 16px → 8px */
        position: sticky; /* 輕量級黏性定位 */
        top: 0;
        z-index: var(--z-sticky);
        backdrop-filter: blur(8px); /* 毛玻璃效果 */
        box-shadow: 0 1px 3px rgba(0, 0, 0, 0.05); /* 更輕的陰影 */
    }
    
    .title {
        font-size: var(--text-lg); /* 縮小字型: 24px → 18px */
        margin-bottom: 0; /* 移除額外間距 */
    }
    
    .status-message {
        margin-top: var(--space-1); /* 減少間距: 8px → 4px */
        min-height: 1rem; /* 降低最小高度: 20px → 16px */
        font-size: var(--text-xs); /* 縮小字型: 14px → 12px */
    }
}

/* Header */
.header {
    padding: var(--space-4);
    box-shadow: var(--shadow-sm);
    position: relative;
    z-index: var(--z-sticky);
}

.title {
    font-size: var(--text-2xl);
    font-weight: var(--font-semibold);
    text-align: center;
    color: var(--text-primary);
    letter-spacing: -0.025em;
}

.status-message {
    margin-top: var(--space-2);
    text-align: center;
    font-size: var(--text-sm);
    font-weight: var(--font-medium);
    min-height: 1.25rem;
    color: var(--text-tertiary);
    transition: all var(--transition-base);
    opacity: 0;
    transform: translateY(-4px);
}

.status-message:not(:empty) {
    opacity: 1;
    transform: translateY(0);
    animation: slideDown 0.3s ease-out;
}

.status-message.error {
    color: var(--error-500);
    background: var(--error-50);
    color: var(--error-600);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--rounded-lg);
    border: 1px solid var(--error-200);
}

.status-message.success {
    color: var(--success-500);
    background: var(--success-50);
    color: var(--success-600);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--rounded-lg);
    border: 1px solid var(--success-200);
}

/* Icon System */
.icon {
    width: 1em;
    height: 1em;
    display: inline-block;
    flex-shrink: 0;
}

.icon.spinner {
    animation: spin 1s linear infinite;
}

/* Canvas container */
.canvas-container {
    flex: 1;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--space-6);
    position: relative;
    min-height: 0;
}

.canvas-card {
    border-radius: var(--rounded-3xl);
    padding: var(--space-6);
    position: relative;
    transition: all var(--transition-slow);
    backdrop-filter: blur(8px);
    animation: scaleIn 0.5s ease-out;
}

.canvas-card:hover {
    transform: translateY(-2px);
    animation: none;
}

#mainCanvas {
    max-width: 100%;
    max-height: 50vh;
    width: auto;
    height: auto;
    border: 2px solid var(--neutral-600);
    border-radius: var(--rounded-xl);
    background: var(--neutral-0);
    touch-action: none;
    cursor: grab;
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    display: block;
    
    /* Optimize for different aspect ratios */
    object-fit: contain;
}

/* 無圖片時的點擊提示樣式 */
#mainCanvas:not(.has-image) {
    cursor: pointer;
}

#mainCanvas:not(.has-image):hover {
    border-color: var(--primary-400);
    box-shadow: 
        var(--shadow-lg),
        0 0 0 1px var(--primary-100),
        0 0 20px var(--primary-200);
    transform: scale(1.01);
}

/* 精確模式視覺提示 */
#mainCanvas.precision-mode {
    border-color: var(--warning-500);
    box-shadow: 
        var(--shadow-xl),
        0 0 0 2px rgba(245, 158, 11, 0.2),
        0 0 30px rgba(245, 158, 11, 0.1);
}

/* 即時數值顯示 */
.transform-values {
    position: fixed;
    top: 50%;
    right: var(--space-4);
    transform: translateY(-50%);
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(8px);
    border-radius: var(--rounded-lg);
    padding: var(--space-3);
    display: none;
    flex-direction: column;
    gap: var(--space-2);
    z-index: var(--z-tooltip);
    color: var(--neutral-0);
    font-size: var(--text-sm);
    min-width: 80px;
}

.value-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--space-2);
}

.value-label {
    font-weight: var(--font-medium);
    opacity: 0.8;
    color: var(--neutral-300);
}

.value-number {
    font-weight: var(--font-semibold);
    color: var(--warning-400);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
}


#mainCanvas:active {
    cursor: grabbing;
    transform: scale(0.98);
    box-shadow: var(--shadow-md);
}

#mainCanvas:hover {
    border-color: var(--neutral-500);
}

#mainCanvas.has-image {
    border-color: var(--primary-400);
    box-shadow: 
        var(--shadow-lg),
        0 0 0 1px var(--primary-100),
        0 0 20px var(--primary-200);
}

#mainCanvas.has-image:hover {
    border-color: var(--primary-500);
    box-shadow: 
        var(--shadow-xl),
        0 0 0 1px var(--primary-200),
        0 0 30px var(--primary-300);
}

.canvas-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    pointer-events: none;
    z-index: 5;
}

.placeholder-text {
    position: absolute !important;
    top: 50% !important;
    left: 50% !important;
    transform: translate(-50%, -50%) !important;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    color: var(--text-tertiary);
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    animation: pulse 2s ease-in-out infinite;
    padding: var(--space-4);
    width: 280px;
}

.placeholder-text p {
    margin: var(--space-2) 0 0 0;
    font-size: var(--text-sm);
    opacity: 0.8;
    line-height: var(--leading-normal);
    width: 100%;
    text-align: center;
}

/* 當畫布可點擊時的樣式變化 */
#mainCanvas:not(.has-image) + .canvas-overlay .placeholder-text {
    transition: all var(--transition-base);
}

#mainCanvas:not(.has-image):hover + .canvas-overlay .placeholder-text {
    color: var(--primary-300);
    transform: translate(-50%, -50%) scale(1.05) !important;
}

#mainCanvas:not(.has-image):hover + .canvas-overlay .placeholder-icon {
    color: var(--primary-400);
}

.placeholder-text.hidden {
    display: none;
}

.placeholder-icon {
    font-size: 3rem;
    margin-bottom: var(--space-4);
    color: var(--primary-300);
    animation: bounce 2s ease-in-out infinite;
}

.placeholder-icon .icon {
    width: 3rem;
    height: 3rem;
}

/* Gesture Hint System */
.gesture-hint {
    position: fixed;
    top: 45%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none;
    z-index: 15;
    color: var(--primary-600);
    font-size: var(--text-base);
    font-weight: var(--font-semibold);
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    padding: var(--space-3) var(--space-4);
    border-radius: var(--rounded-xl);
    border: 2px solid var(--primary-400);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    transition: all var(--transition-base);
    white-space: nowrap;
}

.gesture-hint.show {
    opacity: 1;
    animation: pulse 2s ease-in-out infinite;
}

.gesture-hint.drag {
    animation: dragHint 3s ease-in-out infinite;
}

.gesture-hint.pinch {
    animation: pinchHint 3s ease-in-out infinite;
}

.gesture-hint.rotate {
    animation: rotateHint 3s ease-in-out infinite;
}

/* Canvas with image gets gesture hints */
#mainCanvas.has-image + .canvas-overlay .gesture-hint {
    display: block;
}

.gesture-help {
    position: fixed;
    bottom: 20%;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.85);
    color: var(--neutral-100);
    padding: var(--space-2) var(--space-4);
    border-radius: var(--rounded-full);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    opacity: 0;
    transition: all var(--transition-base);
    z-index: 12;
    white-space: nowrap;
    backdrop-filter: blur(8px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.gesture-help.hidden {
    display: none;
}

/* Gesture Animation Keyframes */
@keyframes dragHint {
    0%, 100% {
        transform: translate(-50%, -50%);
    }
    25% {
        transform: translate(-40%, -40%);
    }
    75% {
        transform: translate(-60%, -60%);
    }
}

@keyframes pinchHint {
    0%, 100% {
        transform: translate(-50%, -50%) scale(1);
    }
    50% {
        transform: translate(-50%, -50%) scale(1.1);
    }
}

@keyframes rotateHint {
    0%, 100% {
        transform: translate(-50%, -50%) rotate(0deg);
    }
    50% {
        transform: translate(-50%, -50%) rotate(15deg);
    }
}

/* Format Selector */
.format-selector {
    background: var(--bg-secondary);
    padding: var(--space-6);
    border-bottom: 1px solid var(--border-primary);
    position: relative;
}

.format-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-secondary);
    margin-bottom: var(--space-6);
    text-align: center;
    letter-spacing: 0.025em;
}

.format-buttons {
    display: flex;
    gap: var(--space-4);
    justify-content: center;
    align-items: center;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    padding: var(--space-2);
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.format-buttons::-webkit-scrollbar {
    display: none;
}

.format-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
    min-width: 80px;
    width: 80px;
    min-height: 80px;
    height: 80px;
    padding: var(--space-3);
    border: 1px solid var(--border-secondary);
    border-radius: var(--rounded-xl);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    flex-shrink: 0;
    position: relative;
    overflow: hidden;
}

.format-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(59, 130, 246, 0.1),
        transparent
    );
    transition: left var(--transition-slow);
}

.format-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-md);
}

.format-btn:hover::before {
    left: 100%;
}

.format-btn:active {
    transform: translateY(0) scale(0.98);
    box-shadow: var(--shadow-sm);
}

.format-btn.active {
    border-color: var(--primary-500);
    background: var(--primary-500);
    color: white;
    box-shadow: var(--shadow-lg);
}

.format-btn.active:hover {
    background: var(--primary-400);
    border-color: var(--primary-400);
    box-shadow: var(--shadow-xl);
}

/* NEW Badge for newly added frame styles */
.new-badge {
    position: absolute;
    top: 2px;
    right: 2px;
    background: linear-gradient(135deg, #ef4444, #dc2626);
    color: white;
    font-size: 8px;
    font-weight: 700;
    padding: 1px 4px;
    border-radius: 3px;
    line-height: 1;
    text-transform: uppercase;
    letter-spacing: 0.3px;
    box-shadow: 0 2px 4px rgba(220, 38, 38, 0.3);
    z-index: 1;
    animation: pulse-badge 2s ease-in-out infinite;
}

@keyframes pulse-badge {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 2px 4px rgba(220, 38, 38, 0.3);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 2px 8px rgba(220, 38, 38, 0.5);
    }
}

.format-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    margin-bottom: 2px;
}

.format-icon .icon {
    width: 1.5rem;
    height: 1.5rem;
}

.format-content {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1px;
    min-width: 0;
    text-align: center;
}

.format-text {
    font-weight: var(--font-semibold);
    line-height: var(--leading-tight);
    font-size: var(--text-xs);
}

.format-desc {
    font-size: 0.625rem;
    opacity: 0.8;
    font-weight: var(--font-normal);
    line-height: var(--leading-tight);
    white-space: nowrap;
}

.format-btn.active .format-desc {
    opacity: 0.9;
}

/* Disabled button styles */
.format-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    filter: grayscale(100%);
    pointer-events: auto; /* Keep pointer events for tooltip */
    background: var(--neutral-100);
    border-color: var(--neutral-300);
}

.format-btn:disabled:hover {
    transform: none;
    box-shadow: none;
    background: var(--neutral-100);
    border-color: var(--neutral-300);
}

.format-btn:disabled:active {
    transform: none;
    box-shadow: none;
}

.format-btn:disabled::before {
    display: none; /* Remove hover effect animation */
}

/* Tooltip for disabled buttons */
.format-btn:disabled {
    position: relative;
}

.format-btn:disabled::after {
    content: attr(title);
    position: absolute;
    bottom: calc(100% + 8px);
    left: 50%;
    transform: translateX(-50%);
    background: var(--neutral-900);
    color: white;
    padding: 0.5rem 0.75rem;
    border-radius: var(--rounded-lg);
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--transition-base);
    z-index: 10;
    box-shadow: var(--shadow-md);
}

.format-btn:disabled:hover::after {
    opacity: 1;
}


/* Precision Selector - using format-selector as base */
.precision-selector .precision-toggle {
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 0;
    padding: 0;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-secondary);
    letter-spacing: 0.025em;
}

.precision-selector .precision-toggle:hover {
    color: var(--primary-500);
}

.precision-selector .precision-toggle .icon {
    transition: transform var(--transition-base);
}

.precision-selector.expanded .precision-toggle .icon {
    transform: rotate(180deg);
}


/* Precision Controls */
.precision-selector .precision-controls {
    max-height: 0;
    opacity: 0;
    transition: all var(--transition-base);
    overflow: hidden;
    padding: 0;
}

.precision-selector.expanded .precision-controls {
    max-height: 400px;
    opacity: 1;
    padding: var(--space-6) var(--space-6) 0;
}



.control-group {
    margin-bottom: var(--space-6);
}

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

.control-label {
    display: block;
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--text-secondary);
    margin-bottom: var(--space-3);
}

.slider-container {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.control-slider {
    flex: 1;
    height: 4px;
    background: var(--border-secondary);
    border-radius: var(--rounded-full);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.control-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-500);
    border-radius: 50%;
    cursor: pointer;
    transition: all var(--transition-base);
}

.control-slider::-webkit-slider-thumb:hover {
    background: var(--primary-400);
    transform: scale(1.1);
}

.control-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-500);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    transition: all var(--transition-base);
}

.control-slider::-moz-range-thumb:hover {
    background: var(--primary-400);
    transform: scale(1.1);
}

.slider-value {
    font-size: var(--text-sm);
    font-weight: var(--font-semibold);
    color: var(--primary-400);
    font-family: 'SF Mono', 'Monaco', 'Inconsolata', 'Roboto Mono', monospace;
    min-width: 45px;
    text-align: right;
}

.position-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
}

.position-row {
    display: flex;
    gap: var(--space-2);
}

.position-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-secondary);
    border-radius: var(--rounded-lg);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: var(--text-base);
    font-weight: var(--font-bold);
    cursor: pointer;
    transition: all var(--transition-base);
    display: flex;
    align-items: center;
    justify-content: center;
}

.position-btn:hover {
    transform: translateY(-1px);
}

.position-btn:active {
    transform: translateY(0) scale(0.95);
}

/* Toolbar */
.toolbar {
    position: fixed;
    bottom: var(--space-4);
    left: var(--space-4);
    right: var(--space-4);
    backdrop-filter: blur(16px);
    border-radius: var(--rounded-2xl);
    padding: var(--space-3);
    display: flex;
    gap: var(--space-2);
    justify-content: center;
    align-items: stretch;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    z-index: var(--z-fixed);
    transition: all var(--transition-base);
    animation: slideUp 0.5s ease-out 0.3s both;
    scrollbar-width: none;
    -ms-overflow-style: none;
}

.toolbar::-webkit-scrollbar {
    display: none;
}


.toolbar-btn {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-width: 58px;
    width: auto;
    min-height: 52px;
    height: 52px;
    padding: var(--space-2) var(--space-3);
    border: 1px solid var(--border-secondary);
    border-radius: var(--rounded-xl);
    background: var(--bg-primary);
    color: var(--text-secondary);
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-base);
    -webkit-tap-highlight-color: transparent;
    touch-action: manipulation;
    position: relative;
    overflow: hidden;
    flex-shrink: 0;
}

.toolbar-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(
        90deg,
        transparent,
        rgba(255, 255, 255, 0.1),
        transparent
    );
    transition: left var(--transition-slow);
}

.toolbar-btn:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.toolbar-btn:hover::before {
    left: 100%;
}

.toolbar-btn:active {
    transform: translateY(0) scale(0.95);
    box-shadow: var(--shadow);
}

.toolbar-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
    transform: none;
    border-color: var(--border-primary);
    color: var(--text-tertiary);
    background: var(--bg-tertiary);
}

.toolbar-btn:disabled:hover {
    border-color: var(--border-primary);
    color: var(--text-tertiary);
    background: var(--bg-tertiary);
    transform: none;
    box-shadow: none;
}

.toolbar-btn:disabled::before {
    display: none;
}

.toolbar-btn.primary {
    border-color: var(--primary-500);
    background: var(--primary-500);
    color: white;
    box-shadow: var(--shadow-md);
}

.toolbar-btn.primary:hover {
    background: var(--primary-400);
    border-color: var(--primary-400);
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.toolbar-btn.primary:active {
    background: var(--primary-600);
    transform: translateY(0) scale(0.95);
}

.btn-icon {
    margin-bottom: 2px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.btn-icon .icon {
    width: 1.125rem;
    height: 1.125rem;
}

.btn-text {
    font-weight: var(--font-medium);
    letter-spacing: 0.025em;
    line-height: 1;
    text-align: center;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 100%;
}

/* Loading overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(8px);
    display: none;
    align-items: center;
    justify-content: center;
    flex-direction: column;
    z-index: var(--z-modal);
    color: var(--text-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.loading-overlay.show {
    display: flex;
    animation: fadeIn var(--transition-base) ease-out forwards;
}

.loading-spinner {
    width: 48px;
    height: 48px;
    margin-bottom: var(--space-4);
    color: var(--primary-500);
}

.loading-spinner .icon {
    width: 48px;
    height: 48px;
}

.loading-overlay p {
    font-size: var(--text-base);
    font-weight: var(--font-medium);
    opacity: 0;
    animation: slideUp 0.4s ease-out 0.2s forwards;
}

/* Keyframe Animations */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

@keyframes fadeIn {
    0% { 
        opacity: 0;
        transform: scale(0.95);
    }
    100% { 
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes slideUp {
    0% {
        opacity: 0;
        transform: translateY(16px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes slideDown {
    0% {
        opacity: 0;
        transform: translateY(-16px);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes scaleIn {
    0% {
        opacity: 0;
        transform: scale(0.8);
    }
    100% {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 1;
        transform: scale(1);
    }
    50% {
        opacity: 0.8;
        transform: scale(1.05);
    }
}

@keyframes bounce {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-4px);
    }
}

@keyframes shimmer {
    0% {
        background-position: -200% 0;
    }
    100% {
        background-position: 200% 0;
    }
}

@keyframes slideInRight {
    0% {
        opacity: 0;
        transform: translateY(-50%) translateX(100%);
    }
    100% {
        opacity: 1;
        transform: translateY(-50%) translateX(0);
    }
}

@keyframes slideInUp {
    0% {
        opacity: 0;
        transform: translateY(100%);
    }
    100% {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile optimizations */
@media (max-width: 767px) {
    .canvas-container {
        padding: 0.5rem;
    }
    
    #mainCanvas {
        max-height: 50vh;
    }
    
    .format-selector {
        padding: var(--space-4);
    }
    
    .format-label {
        margin-bottom: var(--space-4);
    }
    
    .format-selector {
        position: relative; /* 為漸層遮罩提供定位基準 */
    }
    
    .format-buttons {
        gap: var(--space-2);
        padding: var(--space-2) var(--space-4);
        justify-content: flex-start;
    }
    
    /* 左側漸層遮罩 - 固定在容器左邊 */
    .format-selector::before {
        content: '';
        position: absolute;
        left: var(--space-4);
        top: 0;
        bottom: 0;
        width: 24px;
        background: linear-gradient(to right, 
            rgba(244, 241, 234, 0.95), 
            rgba(244, 241, 234, 0.7),
            rgba(244, 241, 234, 0.3),
            transparent
        );
        pointer-events: none;
        z-index: 2;
    }
    
    /* 右側漸層遮罩 - 固定在容器右邊 */
    .format-selector::after {
        content: '';
        position: absolute;
        right: var(--space-4);
        top: 0;
        bottom: 0;
        width: 24px;
        background: linear-gradient(to left, 
            rgba(244, 241, 234, 0.95), 
            rgba(244, 241, 234, 0.7),
            rgba(244, 241, 234, 0.3),
            transparent
        );
        pointer-events: none;
        z-index: 2;
    }
    
    .format-btn {
        min-width: 75px;
        width: 75px;
        min-height: 70px;
        height: 70px;
        padding: var(--space-1);
        flex-shrink: 0;
    }
    
    .format-btn:first-child {
        margin-left: var(--space-2);
    }
    
    .format-btn:last-child {
        margin-right: var(--space-2);
    }
    
    .format-icon .icon {
        width: 1.25rem;
        height: 1.25rem;
    }
    
    .format-text {
        font-size: 0.7rem;
        line-height: 1.1;
        font-weight: 600;
    }
    
    .format-desc {
        font-size: 0.5625rem;
    }
    
    .toolbar {
        padding: 0.75rem;
        gap: 0.5rem;
    }
    
    .toolbar-btn {
        min-width: 56px;
        min-height: 56px;
        padding: 0.4rem;
        font-size: 0.7rem;
    }
    
    .btn-icon {
        font-size: 1.1rem;
    }
}

/* 中等寬度螢幕：按鈕居中顯示，無需滑動 */
@media (min-width: 480px) and (max-width: 767px) {
    .format-buttons {
        justify-content: center;
        overflow-x: visible;
        padding: var(--space-2) var(--space-4);
    }
    
    .format-selector::before,
    .format-selector::after {
        display: none; /* 隱藏漸層遮罩 */
    }
    
    .format-btn:first-child {
        margin-left: 0;
    }
    
    .format-btn:last-child {
        margin-right: 0;
    }
}

/* Responsive adjustments */
@media (min-width: 768px) {
    .app-container {
        max-width: 800px;
        margin: 0 auto;
        border-radius: 12px;
        overflow: hidden;
        margin-top: 2rem;
        margin-bottom: 2rem;
        padding-bottom: 0; /* 移除底部內距，因為工具列不再浮動 */
    }
    
    .header {
        border-radius: 0;
    }
    
    #mainCanvas {
        max-height: 70vh;
    }
    
    .format-selector {
        padding: var(--space-8);
    }
    
    .format-label {
        margin-bottom: var(--space-8);
    }
    
    .format-buttons {
        gap: var(--space-6);
        justify-content: flex-start; /* 改為靠左對齊，確保所有按鈕都可見 */
        overflow-x: auto; /* 允許橫向滾動 */
        padding-left: var(--space-8); /* 增加左側內距 */
    }

    .format-selector::before,
    .format-selector::after {
        display: block; /* 顯示漸層遮罩提示可滾動 */
    }
    
    .format-btn {
        min-width: 90px;
        width: 90px;
        min-height: 90px;
        height: 90px;
        padding: var(--space-4);
    }
    
    .format-icon .icon {
        width: 1.75rem;
        height: 1.75rem;
    }
    
    .format-text {
        font-size: var(--text-sm);
    }
    
    .format-desc {
        font-size: var(--text-xs);
    }
    
    
    /* 桌面版工具列 - 嵌入式設計 */
    .toolbar {
        position: static;
        bottom: auto;
        left: auto;
        right: auto;
        background: var(--bg-secondary);
        backdrop-filter: none;
        border: none;
        border-top: 1px solid var(--border-primary);
        border-radius: 0;
        padding: var(--space-6);
        box-shadow: none;
        gap: var(--space-6);
        animation: none;
        margin: 0;
    }
    
    .toolbar-btn {
        min-width: 80px;
        min-height: 80px;
        padding: var(--space-4);
        font-size: 0.875rem;
    }
    
    .btn-icon {
        font-size: 1.5rem;
    }
}

@media (min-width: 1024px) {
    .canvas-container {
        padding: 2rem;
    }
    
    .toolbar {
        padding: var(--space-8);
        gap: var(--space-8);
    }
    
    .toolbar-btn {
        min-width: 90px;
        min-height: 90px;
        padding: var(--space-5);
    }
}

/* Custom Panel Styles */
.custom-panel {
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 320px;
    background: var(--bg-primary);
    border-top: 2px solid var(--primary-500);
    border-radius: var(--rounded-2xl) var(--rounded-2xl) 0 0;
    box-shadow: var(--shadow-2xl);
    transform: translateY(100%);
    transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1);
    z-index: var(--z-modal);
    overflow: hidden;
}

.custom-panel.active {
    transform: translateY(0);
}

.custom-panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--space-4) var(--space-6);
    border-bottom: 1px solid var(--border-primary);
    background: var(--bg-secondary);
}

.custom-panel-header h3 {
    margin: 0;
    font-size: var(--text-lg);
    font-weight: var(--font-semibold);
    color: var(--text-primary);
}

.panel-close-btn {
    width: 32px;
    height: 32px;
    border: none;
    background: var(--bg-tertiary);
    border-radius: var(--rounded-lg);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.panel-close-btn:hover {
    background: var(--primary-500);
    color: white;
    transform: scale(1.05);
}

.custom-panel-content {
    padding: var(--space-4) var(--space-6);
    height: calc(100% - 64px);
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
}

.control-section {
    margin-bottom: var(--space-6);
    padding-bottom: var(--space-4);
    border-bottom: 1px solid var(--border-secondary);
}

.control-section:last-of-type {
    border-bottom: none;
    margin-bottom: var(--space-4);
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
}

.checkbox-label {
    display: flex !important;
    align-items: center !important;
    gap: var(--space-2) !important;
    font-weight: var(--font-medium) !important;
    color: var(--text-primary) !important;
    font-size: var(--text-base) !important;
    cursor: pointer !important;
    margin: 0 !important;
}

.checkbox-label input[type="checkbox"] {
    width: 18px !important;
    height: 18px !important;
    margin: 0 !important;
    cursor: pointer !important;
    accent-color: var(--primary-500) !important;
}

.checkbox-text {
    line-height: 1 !important;
    user-select: none !important;
}

.visibility-btn {
    width: 36px;
    height: 36px;
    border: 1px solid var(--border-secondary);
    background: var(--bg-primary);
    border-radius: var(--rounded-md);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}

.visibility-btn:hover {
    border-color: var(--primary-500);
    background: var(--primary-50);
}

.visibility-btn.hidden {
    background: var(--bg-tertiary);
    opacity: 0.7;
}

.visibility-btn.hidden .eye-icon::after {
    content: '';
    position: absolute;
    width: 20px;
    height: 2px;
    background: #dc3545;
    transform: rotate(45deg);
    border-radius: 1px;
}

.control-section.hidden {
    opacity: 0.7;
}

.input-group {
    margin-bottom: var(--space-3);
}

.input-group textarea {
    width: 100%;
    min-height: 60px;
    padding: var(--space-3);
    border: 1px solid var(--border-secondary);
    border-radius: var(--rounded-md);
    font-family: inherit;
    font-size: var(--text-sm);
    resize: vertical;
    transition: border-color var(--transition-fast);
    box-sizing: border-box;
}

.input-group textarea:focus {
    outline: none;
    border-color: var(--primary-500);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
}

.control-row {
    display: flex;
    gap: var(--space-4);
    margin-bottom: var(--space-3);
}

.control-item {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.control-item label {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
}

.control-item input[type="range"] {
    width: 100%;
    height: 6px;
    border-radius: var(--rounded-sm);
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
    appearance: none;
}

.control-item input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--primary-500);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-fast);
}

.control-item input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md);
}

.control-item input[type="color"] {
    width: 60px;
    height: 36px;
    border: 1px solid var(--border-secondary);
    border-radius: var(--rounded-md);
    cursor: pointer;
    background: none;
    padding: 0;
}

.value-display {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--primary-600);
    background: var(--primary-50);
    padding: 2px 6px;
    border-radius: var(--rounded-sm);
    text-align: center;
    min-width: 40px;
}

.position-controls {
    margin-bottom: var(--space-3);
}

.position-controls > label {
    display: block;
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    margin-bottom: var(--space-2);
}

.position-sliders {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.slider-group {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.slider-group span:first-child {
    font-size: var(--text-xs);
    font-weight: var(--font-medium);
    color: var(--text-secondary);
    min-width: 16px;
}

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

.slider-group input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary-500);
    cursor: pointer;
    box-shadow: var(--shadow-sm);
}

.upload-area {
    border: 2px dashed var(--border-secondary);
    border-radius: var(--rounded-lg);
    padding: var(--space-4);
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    margin-bottom: var(--space-3);
}

.upload-area:hover {
    border-color: var(--primary-500);
    background: var(--primary-50);
}

.upload-area.dragover {
    border-color: var(--primary-500);
    background: var(--primary-100);
    transform: scale(1.02);
}

.upload-icon {
    font-size: var(--text-2xl);
    margin-bottom: var(--space-2);
}

.upload-area p {
    margin: 0;
    font-size: var(--text-sm);
    color: var(--text-secondary);
}

.image-preview {
    max-width: 100%;
    max-height: 80px;
    border-radius: var(--rounded-md);
    margin-bottom: var(--space-3);
    border: 1px solid var(--border-secondary);
}

.layer-control {
    margin-top: var(--space-3);
}

.panel-actions {
    display: flex;
    gap: var(--space-3);
    padding-top: var(--space-4);
    border-top: 1px solid var(--border-secondary);
}

.action-btn {
    flex: 1;
    padding: var(--space-3) var(--space-4);
    border: none;
    border-radius: var(--rounded-lg);
    font-weight: var(--font-medium);
    cursor: pointer;
    transition: all var(--transition-fast);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-2);
}

.action-btn.primary {
    background: var(--primary-500);
    color: white;
}

.action-btn.primary:hover {
    background: var(--primary-400);
    transform: translateY(-1px);
    box-shadow: var(--shadow-lg);
}

.action-btn.secondary {
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-secondary);
}

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

/* Canvas adaptation when panel is open */
.app-container.with-custom-panel {
    margin-bottom: 320px;
}

.app-container.with-custom-panel .canvas-container {
    margin-bottom: var(--space-4);
}

/* Mobile optimizations for custom panel */
@media (max-width: 767px) {
    .custom-panel {
        height: 300px;
    }
    
    .custom-panel-content {
        padding: var(--space-3) var(--space-4);
    }
    
    .control-row {
        flex-direction: column;
        gap: var(--space-3);
    }
    
    .control-item input[type="color"] {
        width: 100%;
        height: 40px;
    }
    
    .app-container.with-custom-panel {
        margin-bottom: 300px;
    }
}

/* Landscape mode */
@media (max-width: 767px) and (orientation: landscape) {
    .custom-panel {
        width: 350px;
        height: 100vh;
        right: 0;
        left: auto;
        bottom: 0;
        border-radius: var(--rounded-2xl) 0 0 var(--rounded-2xl);
        border-top: none;
        border-left: 2px solid var(--primary-500);
        transform: translateX(100%);
    }
    
    .custom-panel.active {
        transform: translateX(0);
    }
    
    .app-container.with-custom-panel {
        margin-bottom: 0;
        margin-right: 350px;
    }
}

/* High DPI displays */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 192dpi) {
    #mainCanvas {
        image-rendering: -webkit-optimize-contrast;
        image-rendering: crisp-edges;
    }
}

/* Dark mode support - Disabled to maintain warm light theme */
/* 
@media (prefers-color-scheme: dark) {
    // Dark mode styles removed to ensure consistent warm light theme
}
*/

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus styles for keyboard navigation */
.toolbar-btn:focus {
    outline: 2px solid #3498db;
    outline-offset: 2px;
}

/* Image preview modal styles */
.image-preview-modal {
    /* 覆蓋全域設定，啟用圖片的長按和選取功能 */
    -webkit-touch-callout: default !important;
    -webkit-user-select: auto !important;
    user-select: auto !important;
}

.preview-image {
    /* 確保圖片可以被長按保存 */
    -webkit-touch-callout: default !important;
    -webkit-user-select: auto !important;
    user-select: auto !important;
    pointer-events: auto !important;
    
    /* 提供視覺提示這是可互動的圖片 */
    cursor: pointer;
    transition: transform 0.2s ease;
}

.preview-image:active {
    transform: scale(0.98);
}

/* 按鈕容器不應該干擾圖片的觸摸事件 */
.preview-buttons {
    pointer-events: auto;
    touch-action: manipulation;
}

/* Print styles */
@media print {
    .toolbar,
    .header,
    .loading-overlay {
        display: none;
    }
    
    .canvas-container {
        width: 100%;
        height: 100vh;
        padding: 0;
    }
}