/* ----------------------------------------------------
   Design System & Global Styles
---------------------------------------------------- */
:root {
    --bg-app: #fbfbf9;
    --bg-sidebar: #f5f4f0;
    --bg-card: #ffffff;
    --bg-card-hover: #fafafa;
    
    --text-primary: #2d2d2a;
    --text-secondary: #686860;
    --text-muted: #9a9a90;
    
    --color-primary: #3b82f6; /* Modern Blue */
    --color-primary-hover: #2563eb;
    --color-primary-light: rgba(59, 130, 246, 0.1);
    
    --color-accent: #f59e0b; /* Amber for highlights */
    
    --border-color: #e5e5de;
    --border-focus: #3b82f6;
    
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 8px 24px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 16px 40px rgba(0, 0, 0, 0.08);
    
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 18px;
    
    --transition-fast: 0.15s ease;
    --transition-smooth: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[v-cloak] {
    display: none !important;
}

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

body {
    font-family: 'Outfit', 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-app);
    color: var(--text-primary);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    overflow-x: hidden;
    line-height: 1.5;
}

/* ----------------------------------------------------
   Typography & Typography Utilities
---------------------------------------------------- */
.pixel-font {
    font-family: 'Press Start 2P', monospace;
    font-size: 0.8rem;
    color: var(--color-primary);
    display: inline-block;
    animation: pixel-pulse 2s infinite ease-in-out;
}

@keyframes pixel-pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.1); color: var(--color-accent); }
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.03em;
    display: flex;
    align-items: center;
    gap: 8px;
}

.subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 4px;
}

/* ----------------------------------------------------
   App Layout
---------------------------------------------------- */
#app {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

.mobile-header {
    display: none;
    height: 60px;
    padding: 0 20px;
    background: var(--bg-card);
    border-bottom: 1px solid var(--border-color);
    align-items: center;
    justify-content: space-between;
    position: sticky;
    top: 0;
    z-index: 100;
}

.app-layout {
    display: flex;
    flex: 1;
    min-height: 100vh;
}

/* ----------------------------------------------------
   Sidebar Control Panel
---------------------------------------------------- */
.sidebar {
    width: 380px;
    background-color: var(--bg-sidebar);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    height: 100vh;
    position: sticky;
    top: 0;
    z-index: 10;
    overflow-y: auto;
    transition: var(--transition-smooth);
}

.sidebar-header {
    padding: 30px;
    border-bottom: 1px solid var(--border-color);
}

.sidebar-content {
    padding: 30px;
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.sidebar-footer {
    padding: 20px 30px;
    border-top: 1px solid var(--border-color);
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
}

.lang-switch {
    margin-top: 8px;
    font-size: 0.72rem;
    color: var(--text-muted);
}

.lang-switch a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: color var(--transition-fast);
    font-weight: 500;
}

.lang-switch a:hover {
    color: var(--color-primary);
    text-decoration: underline;
    text-underline-offset: 2px;
}

.lang-switch a.active {
    color: var(--color-primary);
    font-weight: 700;
    pointer-events: none; /* 当前选中语言禁用点击交互 */
}

/* ----------------------------------------------------
   Form Controls & Sliders
---------------------------------------------------- */
.control-group {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.group-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.group-title {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.value-badge {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    padding: 2px 8px;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 600;
    color: var(--color-primary);
    min-width: 45px;
    text-align: center;
}

/* Custom Range Slider */
.slider {
    -webkit-appearance: none;
    width: 100%;
    height: 6px;
    border-radius: 3px;
    background: var(--border-color);
    outline: none;
    transition: background var(--transition-fast);
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    border-radius: 50%;
    background: var(--color-primary);
    cursor: pointer;
    box-shadow: 0 2px 6px rgba(59, 130, 246, 0.3);
    transition: transform var(--transition-fast), background var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.15);
    background: var(--color-primary-hover);
}

.slider-labels {
    display: flex;
    justify-content: space-between;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: -4px;
}

/* Style Grid Option Selectors */
.style-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 10px;
}

.style-card {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 16px 8px;
    cursor: pointer;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 10px;
    text-align: center;
    transition: var(--transition-smooth);
    position: relative;
    overflow: hidden;
}

.style-card:hover {
    border-color: var(--text-muted);
    transform: translateY(-2px);
    box-shadow: var(--shadow-sm);
}

.style-card.active {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.15);
}

.style-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.7;
    filter: grayscale(15%);
    transition: opacity var(--transition-fast), filter var(--transition-fast), transform var(--transition-smooth);
}

.style-card:hover .style-icon {
    opacity: 1;
    filter: grayscale(0%) drop-shadow(0 2px 4px rgba(0,0,0,0.08));
    transform: scale(1.08);
}

.style-card.active .style-icon {
    opacity: 1;
    filter: grayscale(0%) drop-shadow(0 4px 8px rgba(59, 130, 246, 0.2));
}

.style-name {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* Accordion for Advanced parameters */
.accordion-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    cursor: pointer;
    padding: 4px 0;
}

.accordion-arrow {
    font-size: 0.7rem;
    color: var(--text-muted);
    transition: transform var(--transition-smooth);
}

.accordion-arrow.open {
    transform: rotate(180deg);
}

.accordion-body {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-smooth);
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.accordion-body.open {
    max-height: 500px; /* arbitrary high value for expansion */
    padding-top: 10px;
}

.control-subgroup {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding-left: 8px;
    border-left: 2px solid var(--border-color);
}

.subgroup-title {
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Checkbox Style */
.checkbox-container {
    display: block;
    position: relative;
    padding-left: 28px;
    margin-bottom: 4px;
    cursor: pointer;
    font-size: 0.8rem;
    font-weight: 500;
    color: var(--text-secondary);
    user-select: none;
}

.checkbox-container input {
    position: absolute;
    opacity: 0;
    cursor: pointer;
    height: 0;
    width: 0;
}

.checkmark {
    position: absolute;
    top: 1px;
    left: 0;
    height: 18px;
    width: 18px;
    background-color: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    transition: var(--transition-fast);
}

.checkbox-container:hover input ~ .checkmark {
    border-color: var(--text-secondary);
}

.checkbox-container input:checked ~ .checkmark {
    background-color: var(--color-primary);
    border-color: var(--color-primary);
}

.checkmark:after {
    content: "";
    position: absolute;
    display: none;
}

.checkbox-container input:checked ~ .checkmark:after {
    display: block;
}

.checkbox-container .checkmark:after {
    left: 6px;
    top: 2px;
    width: 4px;
    height: 9px;
    border: solid white;
    border-width: 0 2px 2px 0;
    transform: rotate(45deg);
}

.help-text {
    font-size: 0.72rem;
    color: var(--text-muted);
    margin-top: 2px;
    padding-left: 28px;
}

/* Reset Settings styles */
.reset-container {
    display: flex;
    justify-content: flex-end;
    margin-top: 10px;
    padding-top: 14px;
    border-top: 1px dashed var(--border-color);
}

.btn-reset {
    display: inline-flex;
    align-items: center;
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-sm);
    padding: 6px 12px;
    font-size: 0.72rem;
    font-weight: 550;
    color: var(--text-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
}

.btn-reset svg {
    margin-right: 4px;
    transition: transform var(--transition-smooth);
}

.btn-reset:hover {
    border-color: #ffa8a8;
    color: #e03131;
    background-color: #fff5f5;
}

.btn-reset:hover svg {
    transform: rotate(-180deg);
}

/* Export Area styles */
.export-section {
    margin-top: auto;
    border-top: 1px solid var(--border-color);
    padding-top: 24px;
}

.export-options {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 12px;
    display: flex;
    flex-direction: column;
    gap: 10px;
}

.export-scale-grid {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 6px;
}

.scale-btn {
    background: var(--bg-app);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    padding: 6px 0;
    font-size: 0.75rem;
    font-weight: 600;
    cursor: pointer;
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

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

.scale-btn.active {
    background: var(--bg-card);
    border: 1.5px solid var(--color-primary);
    color: var(--color-primary);
    font-weight: 700;
}

.export-info {
    font-size: 0.75rem;
    color: var(--text-secondary);
    display: flex;
    justify-content: space-between;
}

/* ----------------------------------------------------
   Buttons & UI Elements
---------------------------------------------------- */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-family: inherit;
    font-size: 0.875rem;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-smooth);
    border: 1px solid transparent;
    padding: 10px 18px;
    gap: 8px;
}

.btn-block {
    display: flex;
    width: 100%;
}

.btn-primary {
    background-color: var(--color-primary);
    color: white;
    box-shadow: 0 4px 12px rgba(59, 130, 246, 0.2);
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 16px rgba(59, 130, 246, 0.3);
}

.btn-primary:active:not(:disabled) {
    transform: translateY(1px);
}

.btn-primary:disabled {
    opacity: 0.6;
    cursor: not-allowed;
}

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

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

.btn-reupload {
    background-color: var(--bg-card);
    border: 1px solid #ffc9c9; /* 淡红色边框 */
    color: #e03131; /* 醒目的红色字体 */
}

.btn-reupload:hover {
    background-color: #fff5f5; /* 淡粉色悬浮背景 */
    border-color: #ffa8a8;
    color: #c92a2a;
}

.btn-sm {
    padding: 6px 12px;
    font-size: 0.8rem;
    border-radius: var(--radius-sm);
}

/* Spinner Loader */
.spinner {
    width: 16px;
    height: 16px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50%;
    border-top-color: white;
    animation: spin 0.8s linear infinite;
}

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

/* ----------------------------------------------------
   Workspace & Upload Dropzone
---------------------------------------------------- */
.workspace {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding: 40px;
    overflow-y: auto;
    background-color: var(--bg-app);
    gap: 60px;
}

/* ----------------------------------------------------
   SEO Articles & FAQ Section Styles
---------------------------------------------------- */
.article-section {
    width: 100%;
    border-top: 1px solid var(--border-color);
    padding-top: 50px;
    margin-top: 20px;
    background-color: var(--bg-app);
}

.article-container {
    max-width: 1000px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    gap: 40px;
}

.info-article {
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 35px;
    box-shadow: var(--shadow-sm);
}

.article-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
    line-height: 1.4;
}

.title-decorator {
    color: var(--color-primary);
    font-size: 0.9rem;
    font-family: monospace;
}

.article-text {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.7;
}

.article-text p {
    margin-bottom: 16px;
}

.article-subtitle {
    font-size: 1.05rem;
    font-weight: 600;
    color: var(--text-primary);
    margin: 25px 0 15px 0;
}

.step-list {
    list-style: none;
    padding: 0;
    margin: 20px 0;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

.step-list li {
    background: var(--bg-app);
    padding: 16px 20px;
    border-radius: var(--radius-md);
    border-left: 3px solid var(--color-primary);
}

.step-list li strong {
    color: var(--text-primary);
    font-size: 0.925rem;
    display: block;
    margin-bottom: 6px;
}

.step-list li p {
    margin: 0;
    font-size: 0.85rem;
}

.article-intro {
    color: var(--text-secondary);
    font-size: 0.9rem;
    margin-bottom: 25px;
}

/* Style grid comparison inside article */
.style-features-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}

.style-feature-card {
    background: var(--bg-app);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.style-badge {
    align-self: flex-start;
    padding: 3px 10px;
    border-radius: 4px;
    font-size: 0.72rem;
    font-weight: 700;
    color: white;
}

.bg-original { background-color: #6c757d; }
.bg-mario { background-color: #e41818; }
.bg-cyberpunk { background-color: #ff007f; }
.bg-grayscale { background-color: #343a40; }
.bg-gameboy { background-color: #8bac0f; }
.bg-nes { background-color: #0058f8; }
.bg-pico8 { background-color: #ff004d; }

.style-feature-card h4 {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
}

.style-feature-card p {
    font-size: 0.825rem;
    color: var(--text-secondary);
    margin: 0;
    line-height: 1.6;
}

/* Programs detailed features grid */
.features-list-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
}

.feature-detail-card {
    display: flex;
    gap: 16px;
    align-items: flex-start;
    background: var(--bg-app);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: 20px;
}

.feature-icon-box {
    background: var(--color-primary-light);
    color: var(--color-primary);
    padding: 10px;
    border-radius: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}

.feature-info-content h3 {
    font-size: 0.95rem;
    font-weight: 650;
    color: var(--text-primary);
    margin-bottom: 6px;
}

.feature-info-content p {
    font-size: 0.825rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin: 0;
}

/* Accordion FAQs using details/summary */
.faq-list {
    display: flex;
    flex-direction: column;
    gap: 14px;
}

.faq-item {
    background: var(--bg-app);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    overflow: hidden;
    transition: var(--transition-fast);
}

.faq-item[open] {
    background: var(--bg-card);
    border-color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: 18px 24px;
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--text-primary);
    cursor: pointer;
    user-select: none;
    display: flex;
    justify-content: space-between;
    align-items: center;
    list-style: none;
}

/* Remove default details arrow */
.faq-question::-webkit-details-marker {
    display: none;
}

.faq-arrow {
    font-size: 0.7rem;
    color: var(--text-muted);
    transition: transform var(--transition-smooth);
}

.faq-item[open] .faq-arrow {
    transform: rotate(180deg);
    color: var(--color-primary);
}

.faq-answer {
    padding: 0 24px 20px 24px;
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.6;
    border-top: 1px dashed var(--border-color);
    padding-top: 16px;
}

.faq-answer p {
    margin: 0;
}

/* Mobile responsive fixes for article elements */
@media (max-width: 768px) {
    .style-features-grid, .features-list-grid {
        grid-template-columns: 1fr;
    }
    
    .info-article {
        padding: 20px;
    }
}

.dropzone-container {
    width: 100%;
    max-width: 600px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.04) 0%, rgba(244, 63, 94, 0.03) 50%, rgba(255, 182, 39, 0.04) 100%), var(--bg-card);
    border: 2px dashed rgba(59, 130, 246, 0.25);
    border-radius: var(--radius-lg);
    padding: 60px 40px;
    cursor: pointer;
    box-shadow: 0 10px 30px rgba(59, 130, 246, 0.04), 0 1px 3px rgba(0, 0, 0, 0.02);
    transition: var(--transition-smooth);
}

.dropzone-container:hover, .dropzone-container.drag-over {
    border-color: var(--color-primary);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.08) 0%, rgba(244, 63, 94, 0.06) 50%, rgba(255, 182, 39, 0.08) 100%), var(--bg-card);
    box-shadow: 0 20px 40px rgba(59, 130, 246, 0.12), 0 15px 30px rgba(244, 63, 94, 0.08), inset 0 0 0 1px rgba(255, 255, 255, 0.6);
    transform: translateY(-2px);
}

.dropzone-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    gap: 20px;
}

.upload-icon {
    width: 84px;
    height: 84px;
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.12) 0%, rgba(228, 24, 24, 0.1) 50%, rgba(255, 182, 39, 0.12) 100%);
    color: var(--color-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: inset 0 2px 5px rgba(255, 255, 255, 0.8), 0 10px 20px rgba(59, 130, 246, 0.05);
    transition: transform var(--transition-smooth), background var(--transition-smooth), color var(--transition-smooth);
}

.dropzone-container:hover .upload-icon, .dropzone-container.drag-over .upload-icon {
    color: var(--color-primary-hover);
    background: linear-gradient(135deg, rgba(59, 130, 246, 0.2) 0%, rgba(228, 24, 24, 0.18) 50%, rgba(255, 182, 39, 0.2) 100%);
    box-shadow: inset 0 2px 5px rgba(255, 255, 255, 0.8), 0 12px 24px rgba(228, 24, 24, 0.12);
    animation: float 2.5s infinite ease-in-out;
}

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

.dropzone-box h2 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
}

.text-link {
    color: white;
    background: var(--color-primary);
    padding: 3px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-decoration: none !important;
    display: inline-block;
    margin: 0 4px;
    box-shadow: 0 4px 10px rgba(59, 130, 246, 0.15);
    transition: var(--transition-fast);
}

.text-link:hover {
    background: var(--color-primary-hover);
    transform: translateY(-1px);
    box-shadow: 0 6px 14px rgba(59, 130, 246, 0.25);
}

.upload-tip {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.hidden-file-input {
    display: none;
}

/* ----------------------------------------------------
   Workspace Preview Area
---------------------------------------------------- */
.preview-container {
    width: 100%;
    max-width: 1200px;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.preview-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.view-switch {
    background: var(--bg-sidebar);
    border: 1px solid var(--border-color);
    padding: 4px;
    border-radius: var(--radius-md);
    display: flex;
    gap: 4px;
}

.tab-btn {
    border: none;
    background: transparent;
    padding: 6px 16px;
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    border-radius: 8px;
    cursor: pointer;
    transition: var(--transition-fast);
}

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

.tab-btn.active {
    background: var(--bg-card);
    color: var(--color-primary);
    box-shadow: var(--shadow-sm);
}

/* Body and Layout Views */
.preview-body {
    flex: 1;
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    position: relative;
    min-height: 450px;
    display: flex;
    padding: 30px;
    gap: 30px;
    align-items: center;
    justify-content: center;
    overflow: hidden;
}

/* Dual Column Layout for Compare Tab */
.preview-body.compare {
    display: grid;
    grid-template-columns: 1fr 1fr;
}

.canvas-wrapper {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    gap: 12px;
}

.canvas-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.canvas-box {
    flex: 1;
    width: 100%;
    height: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    position: relative;
    max-height: 500px;
}

/* Keep pixel art clean and blocky (Important!) */
canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    image-rendering: -moz-crisp-edges;
    image-rendering: -webkit-crisp-edges;
    image-rendering: pixelated;
    image-rendering: crisp-edges;
    border-radius: 4px;
    box-shadow: var(--shadow-sm);
}

.compare-img {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: var(--shadow-sm);
}

/* Processing Overlay */
.processing-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(255, 255, 255, 0.85);
    backdrop-filter: blur(4px);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 5;
    animation: fadeIn var(--transition-fast);
}

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

.loading-box {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 16px;
}

.loading-box p {
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-secondary);
}

/* Retro Pixel Loader animation */
.pixel-loader {
    display: flex;
    gap: 6px;
}

.pixel-dot {
    width: 12px;
    height: 12px;
    background-color: var(--color-primary);
    animation: pixel-bounce 0.6s infinite alternate;
}

.pixel-dot:nth-child(2) {
    animation-delay: 0.2s;
}

.pixel-dot:nth-child(3) {
    animation-delay: 0.4s;
}

@keyframes pixel-bounce {
    from { transform: translateY(0); }
    to { transform: translateY(-10px); background-color: var(--color-accent); }
}

/* ----------------------------------------------------
   Responsive Adjustments (Mobile Layout)
---------------------------------------------------- */
@media (max-width: 900px) {
    .app-layout {
        flex-direction: column;
    }
    
    .mobile-header {
        display: flex;
    }
    
    .sidebar {
        width: 100%;
        height: auto;
        position: static;
        border-right: none;
        border-top: 1px solid var(--border-color);
    }
    
    .sidebar-header {
        display: none; /* logo is in mobile header now */
    }
    
    .sidebar-content {
        padding: 24px;
        gap: 24px;
    }
    
    .workspace {
        padding: 20px;
        min-height: auto;
    }
    
    .preview-container {
        height: auto;
    }
    
    .preview-body {
        min-height: 350px;
        padding: 16px;
        gap: 16px;
    }
    
    .preview-body.compare {
        grid-template-columns: 1fr;
        grid-template-rows: 1fr 1fr;
    }
    
    .canvas-box {
        max-height: 250px;
    }
    
    .PC-only {
        display: none !important;
    }
}

/* ----------------------------------------------------
   Large Screens / PC Layout Optimizations
---------------------------------------------------- */
@media (min-width: 901px) {
    .canvas-box {
        max-height: 650px; /* 提高大屏幕上的纵向预览高度上限 */
    }
}

@media (min-width: 1580px) {
    .workspace {
        min-width: 1200px; /* 当屏幕宽度足够大时，右侧内容区域至少保持 1200px 宽度 */
    }
}

/* ----------------------------------------------------
   Demo Case Carousel Section
---------------------------------------------------- */
.demo-carousel-section {
    width: 100%;
    max-width: 1200px;
    margin: 20px auto 0 auto;
    display: flex;
    flex-direction: column;
    gap: 16px;
    padding: 0 40px;
}

@media (max-width: 900px) {
    .demo-carousel-section {
        padding: 0 20px;
    }
}

.carousel-title {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 4px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.carousel-viewport {
    width: 100%;
    overflow-x: auto;
    scrollbar-width: none; /* Firefox */
    background: var(--bg-card);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 24px;
    box-shadow: var(--shadow-sm);
}

.carousel-viewport::-webkit-scrollbar {
    display: none; /* Chrome/Safari */
}

.carousel-track {
    display: inline-flex;
    gap: 24px;
}

.carousel-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    flex-shrink: 0;
}

.carousel-item img {
    width: 240px;
    height: 180px;
    object-fit: cover;
    border-radius: var(--radius-md);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    image-rendering: pixelated;
    transition: transform var(--transition-smooth);
}

.carousel-item img:hover {
    transform: scale(1.03);
}

.item-label {
    font-size: 0.78rem;
    font-weight: 600;
    color: var(--text-secondary);
}