/* ===== CSS Variables ===== */
:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121a;
    --bg-tertiary: #1a1a24;
    --bg-hover: #222230;
    
    --text-primary: #f0f0f5;
    --text-secondary: #a0a0b0;
    --text-muted: #606070;
    
    --accent-primary: #f5c842;
    --accent-secondary: #e6b830;
    --accent-glow: rgba(245, 200, 66, 0.15);
    
    --success: #4ade80;
    --error: #f87171;
    
    --border-color: rgba(255, 255, 255, 0.08);
    --border-hover: rgba(255, 255, 255, 0.15);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.5);
    
    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
    --transition-slow: 400ms ease;
}

/* ===== Light Mode (System Preference) ===== */
@media (prefers-color-scheme: light) {
    :root:not([data-theme="dark"]) {
        --bg-primary: #f5f5f7;
        --bg-secondary: #ffffff;
        --bg-tertiary: #eaeaec;
        --bg-hover: #dcdcde;
        
        --text-primary: #1a1a2e;
        --text-secondary: #4a4a5a;
        --text-muted: #7a7a8a;
        
        --accent-primary: #d49800;
        --accent-secondary: #b88400;
        --accent-glow: rgba(212, 152, 0, 0.15);
        
        --success: #16a34a;
        --error: #dc2626;
        
        --border-color: rgba(0, 0, 0, 0.12);
        --border-hover: rgba(0, 0, 0, 0.2);
        
        --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
        --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.15);
        --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.18);
    }
}

/* ===== Manual Light Mode ===== */
:root[data-theme="light"] {
    --bg-primary: #f5f5f7;
    --bg-secondary: #ffffff;
    --bg-tertiary: #eaeaec;
    --bg-hover: #dcdcde;
    
    --text-primary: #1a1a2e;
    --text-secondary: #4a4a5a;
    --text-muted: #7a7a8a;
    
    --accent-primary: #d49800;
    --accent-secondary: #b88400;
    --accent-glow: rgba(212, 152, 0, 0.15);
    
    --success: #16a34a;
    --error: #dc2626;
    
    --border-color: rgba(0, 0, 0, 0.12);
    --border-hover: rgba(0, 0, 0, 0.2);
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.15);
    --shadow-lg: 0 16px 48px rgba(0, 0, 0, 0.18);
}

/* Light mode specific overrides for badges and hints */
[data-theme="light"] .result-badge,
[data-theme="light"] .result-zoom-hint {
    background: rgba(0, 0, 0, 0.75);
    color: #ffffff;
}

[data-theme="light"] .result-badge.success {
    color: #4ade80;
}

[data-theme="light"] .result-badge.no-watermark {
    color: #fbbf24;
}

[data-theme="light"] .lightbox-hint {
    background: rgba(0, 0, 0, 0.85);
    color: #e0e0e0;
}

@media (prefers-color-scheme: light) {
    :root:not([data-theme]) .result-badge,
    :root:not([data-theme]) .result-zoom-hint {
        background: rgba(0, 0, 0, 0.75);
        color: #ffffff;
    }
    
    :root:not([data-theme]) .result-badge.success {
        color: #4ade80;
    }
    
    :root:not([data-theme]) .result-badge.no-watermark {
        color: #fbbf24;
    }
    
    :root:not([data-theme]) .lightbox-hint {
        background: rgba(0, 0, 0, 0.85);
        color: #e0e0e0;
    }
}

/* ===== Reset & Base ===== */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    scrollbar-width: thin;
    scrollbar-color: var(--text-muted) transparent;
}

/* ===== Scrollbar Styles ===== */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
    border-radius: 10px;
}

::-webkit-scrollbar-thumb {
    background: var(--text-muted);
    border-radius: 10px;
    border: 2px solid transparent;
    background-clip: content-box;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-secondary);
    background-clip: content-box;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.6;
}

/* ===== Site Header ===== */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--bg-primary);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
}

/* ===== App Container ===== */
.app-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
    min-height: calc(100vh - 70px);
    display: flex;
    flex-direction: column;
}

/* ===== Header Nav ===== */
.header-nav {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.75rem 2rem;
}

.site-brand {
    display: flex;
    align-items: center;
    gap: 0.45rem;
    min-width: 0;
}

.logo {
    display: block;
    border-radius: 6px;
}

.w-8 {
    width: 2rem;
}

.h-8 {
    height: 2rem;
}

.object-contain {
    object-fit: contain;
}

.site-name {
    color: var(--text-primary);
    font-size: 0.9375rem;
    font-weight: 600;
    letter-spacing: 0.005em;
    white-space: nowrap;
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    flex-shrink: 0;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 0.75rem;
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.8125rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

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

.nav-link svg {
    flex-shrink: 0;
}

.nav-label {
    white-space: nowrap;
}

.nav-divider {
    width: 1px;
    height: 24px;
    background: var(--border-color);
    margin: 0 0.25rem;
}

/* Theme Toggle Button */
.theme-toggle {
    border: none;
    cursor: pointer;
    font-family: inherit;
    background: transparent;
}

.theme-toggle .theme-icon {
    transition: all var(--transition-normal);
}

/* Default: dark mode (show sun to switch to light) */
.theme-toggle .sun {
    display: block;
}

.theme-toggle .moon {
    display: none;
}

/* When light mode is active (show moon to switch to dark) */
[data-theme="light"] .theme-toggle .sun {
    display: none;
}

[data-theme="light"] .theme-toggle .moon {
    display: block;
}

[data-theme="dark"] .theme-toggle{
    background: var(--bg-tertiary);
}

/* System light preference without explicit theme set */
@media (prefers-color-scheme: light) {
    :root:not([data-theme]) .theme-toggle .sun {
        display: none;
    }
    :root:not([data-theme]) .theme-toggle .moon {
        display: block;
    }
}

.github-link {
    color: var(--text-primary);
}

.github-link:hover {
    background: var(--bg-hover);
}

.github-stars {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.25rem 0.5rem;
    background: rgba(245, 200, 66, 0.1);
    border-radius: var(--radius-sm);
    color: var(--accent-primary);
    font-size: 0.75rem;
}

.github-stars svg {
    width: 10px;
    height: 10px;
}

/* ===== Language Selector ===== */
.lang-selector {
    position: relative;
}

.lang-toggle {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    cursor: pointer;
    border: none;
    background: transparent;
}

.current-lang {
    font-size: 0.75rem;
    max-width: 80px;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lang-arrow {
    transition: transform var(--transition-fast);
}

.lang-dropdown.show + .lang-toggle .lang-arrow,
.lang-toggle:focus + .lang-dropdown.show ~ .lang-arrow {
    transform: rotate(180deg);
}

.lang-dropdown {
    position: absolute;
    top: calc(100% + 0.5rem);
    right: 0;
    min-width: 160px;
    max-height: 320px;
    overflow-y: auto;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-8px);
    transition: all var(--transition-fast);
    z-index: 100;
}

.lang-dropdown.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.lang-option {
    display: block;
    width: 100%;
    padding: 0.625rem 1rem;
    text-align: left;
    font-size: 0.8125rem;
    font-family: inherit;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
}

.lang-option:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.lang-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.lang-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

/* RTL Support */
[dir="rtl"] .lang-dropdown {
    right: auto;
    left: 0;
}

[dir="rtl"] .lang-option {
    text-align: right;
}

[dir="rtl"] .step-arrow {
    transform: scaleX(-1);
}

/* ===== Header ===== */
.header {
    text-align: center;
    padding: 2.25rem 0 3rem;
}

.title {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.75rem;
}

.title-icon {
    font-size: 2.25rem;
    animation: bounce 2s ease-in-out infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-8px); }
}

.subtitle {
    margin-top: 0.75rem;
    color: var(--text-secondary);
    font-size: 1rem;
}

/* ===== Main Content ===== */
.main-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

/* ===== Settings Section ===== */
.settings-section {
    display: flex;
    justify-content: center;
    margin-bottom: 0.5rem;
}

.setting-item {
    display: flex;
    align-items: center;
    gap: 1.5rem;
    padding: 0.875rem 1.5rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.setting-item:hover {
    border-color: var(--border-hover);
    background: var(--bg-tertiary);
}

.setting-content {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.setting-title {
    font-size: 0.9375rem;
    font-weight: 600;
    color: var(--text-primary);
}

.setting-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

/* Toggle Switch */
.switch {
    position: relative;
    display: inline-block;
    width: 44px;
    height: 24px;
    flex-shrink: 0;
}

.switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--bg-tertiary);
    transition: .3s cubic-bezier(0.4, 0, 0.2, 1);
    border: 1px solid var(--border-color);
}

.slider:before {
    position: absolute;
    content: "";
    height: 18px;
    width: 18px;
    left: 2px;
    bottom: 2px;
    background-color: var(--text-muted);
    transition: .3s cubic-bezier(0.4, 0, 0.2, 1);
}

.switch input:checked + .slider {
    background-color: var(--accent-primary);
    border-color: var(--accent-secondary);
}

.switch input:checked + .slider:before {
    transform: translateX(20px);
    background-color: var(--bg-primary);
}

.slider.round {
    border-radius: 24px;
}

.slider.round:before {
    border-radius: 50%;
}

/* ===== Drop Zone ===== */
.drop-zone {
    background: var(--bg-secondary);
    border: 2px dashed var(--border-color);
    border-radius: var(--radius-xl);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.drop-zone::before {
    content: '';
    position: absolute;
    inset: 0;
    background: radial-gradient(circle at center, var(--accent-glow) 0%, transparent 70%);
    opacity: 0;
    transition: opacity var(--transition-normal);
}

.drop-zone:hover,
.drop-zone.drag-over {
    border-color: var(--accent-primary);
    background: var(--bg-tertiary);
}

.drop-zone:hover::before,
.drop-zone.drag-over::before {
    opacity: 1;
}

.drop-zone-content {
    position: relative;
    z-index: 1;
}

.drop-icon {
    color: var(--accent-primary);
    margin-bottom: 1.5rem;
    transition: transform var(--transition-normal);
}

.drop-zone:hover .drop-icon,
.drop-zone.drag-over .drop-icon {
    transform: translateY(-4px) scale(1.05);
}

.drop-text {
    font-size: 1.25rem;
    font-weight: 500;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.drop-hint {
    font-size: 0.875rem;
    color: var(--text-muted);
}

/* ===== Usage Steps ===== */
.usage-steps {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 1.5rem;
    padding: 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
}

.step {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.step-number {
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--accent-primary);
    color: var(--bg-primary);
    font-weight: 700;
    font-size: 0.875rem;
    border-radius: 50%;
    flex-shrink: 0;
}

.step-content {
    display: flex;
    flex-direction: column;
    gap: 0.125rem;
}

.step-title {
    font-weight: 600;
    font-size: 0.875rem;
    color: var(--text-primary);
}

.step-desc {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.step-arrow {
    color: var(--text-muted);
    font-size: 1.25rem;
    flex-shrink: 0;
}

/* ===== Status Bar ===== */
.status-bar {
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    padding: 1.25rem 1.5rem;
    border: 1px solid var(--border-color);
}

.status-info {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 0.75rem;
}

.status-text {
    font-weight: 500;
    color: var(--text-primary);
}

.status-count {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-variant-numeric: tabular-nums;
}

.progress-bar {
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--accent-secondary), var(--accent-primary));
    border-radius: 3px;
    width: 0%;
    transition: width var(--transition-fast);
}

/* ===== Results Section ===== */
.results-section {
    animation: fadeIn var(--transition-slow);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(16px); }
    to { opacity: 1; transform: translateY(0); }
}

.results-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
    gap: 1rem;
}

.results-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
}

.results-actions {
    display: flex;
    gap: 0.75rem;
}

/* ===== Buttons ===== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.25rem;
    font-size: 0.875rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-fast);
    font-family: inherit;
}

.btn-primary {
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-primary);
    box-shadow: 0 4px 16px rgba(245, 200, 66, 0.25);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 24px rgba(245, 200, 66, 0.35);
}

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

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

.btn-icon {
    padding: 0.5rem;
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

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

/* ===== Results Grid ===== */
.results-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

/* ===== Result Card ===== */
.result-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    border: 1px solid var(--border-color);
    transition: all var(--transition-normal);
    animation: cardIn var(--transition-slow) backwards;
}

@keyframes cardIn {
    from { opacity: 0; transform: scale(0.95); }
    to { opacity: 1; transform: scale(1); }
}

.result-card:hover {
    border-color: var(--border-hover);
    box-shadow: var(--shadow-md);
    transform: translateY(-4px);
}

.result-image-container {
    position: relative;
    aspect-ratio: 16 / 10;
    background: var(--bg-primary);
    overflow: hidden;
}

.result-image-container.clickable {
    cursor: pointer;
}

.result-image-container.clickable:hover .result-image {
    transform: scale(1.02);
}

.result-zoom-hint {
    position: absolute;
    bottom: 0.75rem;
    right: 0.75rem;
    width: 32px;
    height: 32px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(4px);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    opacity: 0;
    transform: scale(0.9);
    transition: all var(--transition-fast);
}

.result-image-container.clickable:hover .result-zoom-hint {
    opacity: 1;
    transform: scale(1);
}

.result-image {
    width: 100%;
    height: 100%;
    object-fit: contain;
    transition: transform var(--transition-normal);
}

.result-badge {
    position: absolute;
    top: 0.75rem;
    left: 0.75rem;
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 500;
    border-radius: var(--radius-sm);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(8px);
}

.result-badge.success {
    color: var(--success);
}

.result-badge.error {
    color: var(--error);
}

.result-badge.no-watermark {
    color: #fbbf24;
    background: rgba(251, 191, 36, 0.15);
}

.result-info {
    padding: 1rem;
}

.result-filename {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    margin-bottom: 0.5rem;
}

.result-meta {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.result-size {
    font-size: 0.75rem;
    color: var(--text-muted);
}

.result-download-btn {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    color: var(--accent-primary);
    background: transparent;
    border: none;
    cursor: pointer;
    font-weight: 500;
    font-family: inherit;
    padding: 0.25rem 0.5rem;
    border-radius: var(--radius-sm);
    transition: all var(--transition-fast);
}

.result-download-btn:hover {
    color: var(--accent-secondary);
    background: var(--bg-tertiary);
}

/* ===== Footer ===== */
.footer {
    text-align: center;
    padding: 2rem 0;
    color: var(--text-muted);
    font-size: 0.875rem;
    border-top: 1px solid var(--border-color);
    margin-top: 2rem;
}

.footer-privacy {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    margin-bottom: 1.25rem;
    color: var(--text-secondary);
}

.footer-author {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
}

.author-name {
    font-weight: 500;
    color: var(--text-primary);
}

.author-links {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.author-links a,
.info-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    color: var(--text-secondary);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
}

.author-links a:hover,
.info-btn:hover {
    background: var(--bg-hover);
    border-color: var(--border-hover);
    color: var(--accent-primary);
    transform: translateY(-2px);
}

/* ===== Modal ===== */
.modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.75);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
    animation: modalFadeIn var(--transition-normal);
}

@keyframes modalFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.modal {
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    max-width: 560px;
    width: 100%;
    max-height: 80vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
    animation: modalSlideIn var(--transition-normal);
}

@keyframes modalSlideIn {
    from { opacity: 0; transform: translateY(20px) scale(0.95); }
    to { opacity: 1; transform: translateY(0) scale(1); }
}

.modal-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 1.25rem 1.5rem;
    border-bottom: 1px solid var(--border-color);
}

.modal-title {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
}

.modal-close {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    color: var(--text-muted);
    cursor: pointer;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.modal-content {
    padding: 1.5rem;
    overflow-y: auto;
}

.modal-section {
    margin-bottom: 1.5rem;
}

.modal-section:last-child {
    margin-bottom: 0;
}

.modal-section h4 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
    margin-bottom: 0.75rem;
}

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

.version-badge {
    display: inline-flex;
    padding: 0.25rem 0.625rem;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: var(--bg-primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
}

.version-date {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.changelog {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.changelog li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    padding-left: 0.25rem;
}

.license-box {
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 1rem;
}

.license-box p {
    margin-bottom: 0.75rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.license-box p:last-child {
    margin-bottom: 0;
}

.license-box strong {
    color: var(--text-primary);
}

.license-text {
    font-size: 0.75rem !important;
    color: var(--text-muted) !important;
    line-height: 1.5;
}

/* ===== Lightbox ===== */
.lightbox-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.92);
    backdrop-filter: blur(8px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 2000;
    padding: 1rem;
    animation: lightboxFadeIn var(--transition-normal);
}

@keyframes lightboxFadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

.lightbox-overlay[hidden] {
    display: none !important;
}

.lightbox-content {
    position: relative;
    max-width: 90vw;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.lightbox-close {
    position: absolute;
    top: -3rem;
    right: 0;
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    z-index: 10;
}

.lightbox-close:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.lightbox-image-container {
    position: relative;
    max-width: 100%;
    max-height: calc(90vh - 100px);
    cursor: pointer;
    border-radius: var(--radius-lg);
    overflow: hidden;
    background: var(--bg-secondary);
}

.lightbox-image {
    max-width: 100%;
    max-height: calc(90vh - 100px);
    object-fit: contain;
    display: block;
    transition: opacity var(--transition-fast);
}

.lightbox-image.comparing {
    opacity: 0.95;
}

.lightbox-hint {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1rem;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(4px);
    border-radius: var(--radius-md);
    color: var(--text-secondary);
    font-size: 0.75rem;
    white-space: nowrap;
    opacity: 1;
    transition: opacity var(--transition-normal);
    pointer-events: none;
}

.lightbox-image-container:hover .lightbox-hint {
    opacity: 0;
}

.lightbox-info {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.5rem;
    width: 100%;
    max-width: 600px;
    padding: 0 0.5rem;
}

.lightbox-filename {
    font-size: 0.875rem;
    color: var(--text-secondary);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.lightbox-toggle {
    display: flex;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 0.25rem;
    gap: 0.25rem;
    flex-shrink: 0;
}

.toggle-btn {
    padding: 0.5rem 1rem;
    font-size: 0.8125rem;
    font-weight: 500;
    font-family: inherit;
    color: var(--text-secondary);
    background: transparent;
    border: none;
    border-radius: var(--radius-sm);
    cursor: pointer;
    transition: all var(--transition-fast);
    white-space: nowrap;
}

.toggle-btn:hover {
    color: var(--text-primary);
}

.toggle-btn.active {
    background: var(--accent-primary);
    color: var(--bg-primary);
}

.lightbox-nav {
    position: absolute;
    top: 50%;
    left: 0;
    right: 0;
    transform: translateY(-50%);
    display: flex;
    justify-content: space-between;
    padding: 0 1rem;
    pointer-events: none;
}

.lightbox-nav-btn {
    width: 44px;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: 50%;
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-fast);
    pointer-events: auto;
    opacity: 0.8;
}

.lightbox-nav-btn:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    opacity: 1;
    transform: scale(1.05);
}

.lightbox-nav-btn:disabled {
    opacity: 0.3;
    cursor: not-allowed;
}

/* Original image indicator badge */
.lightbox-image-container.showing-original::before {
    content: '原圖';
    position: absolute;
    top: 1rem;
    left: 1rem;
    padding: 0.375rem 0.75rem;
    background: rgba(251, 191, 36, 0.9);
    color: var(--bg-primary);
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: var(--radius-sm);
    z-index: 5;
}

/* Ensure hidden attribute works with display flex */
.modal-overlay[hidden] {
    display: none !important;
}

/* ===== Responsive ===== */
@media (max-width: 768px) {
    .app-container {
        padding: 1rem;
        padding-top: 1rem;
    }

    .header-nav {
        position: static;
        padding: 0.625rem 1rem;
        gap: 0.5rem;
    }

    .site-name {
        font-size: 0.75rem;
        max-width: 140px;
        overflow: hidden;
        text-overflow: ellipsis;
    }

    .site-brand {
        gap: 0.35rem;
    }

    .w-8 {
        width: 1.5rem;
    }

    .h-8 {
        height: 1.5rem;
    }
    
    .nav-link {
        padding: 0.5rem;
    }
    
    .nav-label {
        display: none;
    }
    
    .nav-divider {
        height: 20px;
        margin: 0 0.125rem;
    }
    
    .github-stars {
        padding: 0.125rem 0.375rem;
    }
    
    .title {
        font-size: 1.5rem;
        flex-wrap: wrap;
    }
    
    .title-icon {
        font-size: 2.5rem;
        width: 100%;
        display: block;
        text-align: center;
        margin-bottom: 0.25rem;
    }
    
    .drop-zone {
        padding: 3rem 1.5rem;
    }
    
    .usage-steps {
        flex-direction: column;
        gap: 0.75rem;
        padding: 1rem;
    }
    
    .step-arrow {
        display: none;
    }
    
    .step {
        width: 100%;
    }
    
    .results-header {
        flex-direction: column;
        align-items: stretch;
    }
    
    .results-actions {
        justify-content: stretch;
    }
    
    .results-actions .btn {
        flex: 1;
        justify-content: center;
    }
    
    .results-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-privacy {
        flex-direction: column;
        text-align: center;
    }
}

/* ===== Toast Notifications ===== */
.toast-container {
    position: fixed;
    top: 1.5rem;
    left: 50%;
    transform: translateX(-50%);
    z-index: 3000;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    pointer-events: none;
}

.toast {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.875rem 1.25rem;
    background: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    color: var(--text-primary);
    font-size: 0.875rem;
    font-weight: 500;
    pointer-events: auto;
    animation: toastSlideIn var(--transition-normal) ease-out;
    max-width: 90vw;
}

.toast.toast-success {
    border-color: var(--success);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(74, 222, 128, 0.1) 100%);
}

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

.toast.toast-error {
    border-color: var(--error);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(248, 113, 113, 0.1) 100%);
}

.toast.toast-error .toast-icon {
    color: var(--error);
}

.toast.toast-warning {
    border-color: var(--accent-primary);
    background: linear-gradient(135deg, var(--bg-secondary) 0%, rgba(245, 200, 66, 0.1) 100%);
}

.toast.toast-warning .toast-icon {
    color: var(--accent-primary);
}

.toast-icon {
    flex-shrink: 0;
}

.toast-message {
    flex: 1;
}

.toast.removing {
    animation: toastSlideOut var(--transition-fast) ease-in forwards;
}

@keyframes toastSlideIn {
    from {
        opacity: 0;
        transform: translateY(-1rem);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

@keyframes toastSlideOut {
    from {
        opacity: 1;
        transform: translateY(0);
    }
    to {
        opacity: 0;
        transform: translateY(-1rem);
    }
}