/* ===================================
   CSS Reset & Base Styles
   =================================== */

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

:root {
    /* Primary Colors */
    --primary-color: #2563EB;
    --primary-hover: #1D4ED8;
    --primary-light: #3B82F6;

    /* Pixel Accent Colors (B-4 Hybrid Pixel Style) */
    --pixel-green: #6BAA3E;
    --pixel-green-hover: #5A942D;
    --pixel-green-light: rgba(107, 170, 62, 0.1);
    --pixel-green-glow: rgba(107, 170, 62, 0.3);
    --pixel-brown: #8B7355;
    --pixel-blue: #5B8FF9;
    --pixel-gradient: linear-gradient(135deg, #6BAA3E 0%, #8BC34A 100%);

    /* Neutral Colors */
    --bg-primary: #FFFFFF;
    --bg-secondary: #F3F4F6;
    --bg-tertiary: #F9FAFB;
    --bg-elevated: #FFFFFF;
    --bg-dark: #111827;

    /* Text Colors */
    --text-primary: #1F2937;
    --text-secondary: #6B7280;
    --text-tertiary: #9CA3AF;
    --text-light: #D1D5DB;

    /* Border & Shadow */
    --border-color: #E5E7EB;
    --border-hover: #D1D5DB;
    --border-subtle: #F3F4F6;
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
    --shadow-pixel: 4px 4px 0 rgba(107, 170, 62, 0.3);

    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;

    /* Layout Sizes */
    --maxwidth-content: 800px;
    --maxwidth-showcase: 1400px;
    --width-controls-panel: 380px;
    --height-showcase-grid-item: 120px;

    /* Border Radius */
    --radius-sm: 0.25rem;    /* 4px - pixel corner */
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;

    /* Font */
    --font-sans: system-ui, -apple-system, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    --font-mono: 'JetBrains Mono', 'Roboto Mono', 'Courier New', monospace;
    --font-pixel: 'Pixelify Sans', sans-serif;
}

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    color: var(--text-primary);
    background-color: var(--bg-primary);
    line-height: 1.6;
}

/* ===================================
   Header / Navigation
   =================================== */

.header {
    background-color: var(--bg-primary);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: var(--shadow-sm);
}

.nav {
    max-width: 1400px;
    margin: 0 auto;
    padding: var(--spacing-md) var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--pixel-green);
    text-decoration: none;
}

.logo-img {
    height: 40px;
    width: auto;
    display: block;
}

.logo-text {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    letter-spacing: -0.02em;
}

.logo-icon {
    font-size: 1.5rem;
    image-rendering: pixelated;
}

.nav-links {
    display: flex;
    gap: var(--spacing-lg);
    align-items: center;
}

.nav-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s;
    font-size: 0.95rem;
}

.nav-links a:hover {
    color: var(--pixel-green);
}

/* ===================================
   Hero Section
   =================================== */

.hero {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-primary) 100%);
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
}

.hero-content {
    max-width: 900px;
    margin: 0 auto;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    line-height: 1.1;
    background: linear-gradient(135deg, var(--text-primary) 0%, var(--primary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-description {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.7;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    justify-content: center;
    margin-bottom: var(--spacing-2xl);
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-2xl);
}

.stat {
    text-align: center;
}

.stat-number {
    font-size: 2rem;
    font-weight: 800;
    color: var(--pixel-green);
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ===================================
   Simple Hero Section (Left-Right Layout)
   =================================== */

.hero-simple {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background: linear-gradient(135deg, #FFFFFF 0%, rgba(107, 170, 62, 0.03) 100%);
    position: relative;
    overflow: hidden;
}

/* Second layer: Diagonal green gradient */
.hero-simple::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(
        135deg,
        transparent 0%,
        rgba(107, 170, 62, 0.08) 50%,
        rgba(139, 195, 74, 0.06) 100%
    );
    pointer-events: none;
    z-index: 0;
}

/* Third layer: Bottom-right spotlight effect */
.hero-simple::after {
    content: '';
    position: absolute;
    bottom: -50%;
    right: -20%;
    width: 80%;
    height: 80%;
    background: radial-gradient(
        ellipse at center,
        rgba(107, 170, 62, 0.12) 0%,
        rgba(107, 170, 62, 0.05) 40%,
        transparent 70%
    );
    pointer-events: none;
    z-index: 0;
}

.hero-wrapper {
    position: relative;
    z-index: 1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
}

/* Left Content */
.hero-left {
    text-align: left;
}

.hero-content {
    max-width: 100%;
}

.hero-content h1 {
    font-family: var(--font-pixel);
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    line-height: 1.2;
    position: relative;
    letter-spacing: -0.01em;
}

.hero-content p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: var(--spacing-xl);
}

/* Upload Container */
.hero-upload-container {
    margin-top: var(--spacing-xl);
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-md);
}

.upload-features {
    list-style: none;
    padding: 0;
    margin: 0;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

.upload-features li {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
    line-height: 1.5;
    letter-spacing: 0.01em;
    width: 100%;
    display: flex;
    gap: var(--spacing-xl);
}

.upload-features li span {
    white-space: nowrap;
}

.hero-upload-btn {
    display: inline-flex;
    align-items: center;
    gap: var(--spacing-sm);
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1rem;
    font-weight: 600;
    color: white;
    background: var(--pixel-gradient);
    border: none;
    border-radius: var(--radius-md);
    cursor: pointer;
    box-shadow: 0 4px 0 rgba(107, 170, 62, 0.3);
    transition: all 0.2s;
    width: auto;
    min-width: 220px;
    justify-content: center;
}

.hero-upload-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 0 rgba(107, 170, 62, 0.3);
}

.hero-upload-btn:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 rgba(107, 170, 62, 0.3);
}

.hero-upload-btn .btn-icon {
    font-size: 1.5rem;
}

/* Right Content - Demo Image */
.hero-right {
    display: flex;
    justify-content: center;
    align-items: center;
}

.hero-demo-image {
    width: 100%;
    max-width: 500px;
}

.hero-demo-image img {
    width: 100%;
    height: auto;
    display: block;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-pixel);
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
}

/* ===================================
   Buttons
   =================================== */

.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-sm); /* 4px pixel corner */
    font-weight: 600;
    text-decoration: none;
    transition: all 0.2s;
    cursor: pointer;
    border: none;
    font-size: 1rem;
}

.btn-primary {
    background-color: var(--pixel-green);
    color: white;
    box-shadow: var(--shadow-pixel);
}

.btn-primary:hover {
    background-color: var(--pixel-green-hover);
    transform: translateY(-2px);
    box-shadow: 6px 6px 0 rgba(107, 170, 62, 0.4);
}

.btn-secondary {
    background-color: var(--bg-secondary);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
}

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

.btn-large {
    padding: var(--spacing-md) var(--spacing-2xl);
    font-size: 1rem;
    border-radius: var(--radius-sm);
}

/* ===================================
   Section Headers
   =================================== */

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    max-width: var(--maxwidth-content);
    margin-left: auto;
    margin-right: auto;
    position: relative;
}

.section-header h2 {
    font-family: var(--font-sans);
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    line-height: 1.2;
    letter-spacing: -0.02em;
}

.section-header p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-top: var(--spacing-lg);
}

/* ===================================
   Converter Section
   =================================== */

.converter-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background-color: var(--bg-secondary);
    display: none;
}

.converter-section.active {
    display: block;
}

/* Initial State - Upload Button Only */
.converter-initial {
    max-width: var(--maxwidth-content);
    margin: 0 auto;
}

.upload-button-container {
    text-align: center;
}

.upload-button-large {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    width: 100%;
    max-width: 500px;
    margin: 0 auto;
    padding: var(--spacing-3xl) var(--spacing-xl);
    background: var(--pixel-gradient);
    color: white;
    border: 4px dashed rgba(255, 255, 255, 0.3);
    border-radius: var(--radius-sm);
    font-size: 1.25rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: var(--shadow-pixel);
    position: relative;
}

.upload-button-large:hover {
    transform: translateY(-4px);
    box-shadow: 6px 6px 0 rgba(107, 170, 62, 0.5);
    border-color: rgba(255, 255, 255, 0.5);
}

.upload-button-large .upload-icon {
    font-size: 4rem;
    margin-bottom: var(--spacing-sm);
    image-rendering: pixelated;
    filter: drop-shadow(2px 2px 0 rgba(0, 0, 0, 0.2));
}

.upload-button-large .upload-text {
    font-size: 1.5rem;
    font-weight: 800;
}

.upload-button-large .upload-subtext {
    font-size: 0.95rem;
    font-weight: 500;
    opacity: 0.9;
}

.upload-formats {
    margin-top: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 0.875rem;
}

/* Active State - Full Workspace */
.converter-active {
    max-width: 1400px;
    margin: 0 auto;
}

.workspace {
    display: grid;
    grid-template-columns: var(--width-controls-panel) 1fr;
    gap: var(--spacing-xl);
    align-items: stretch; /* Key: Make both sides equal height */
}

/* Controls Panel (Left) */
.controls-panel {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.panel-title {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

/* Parameters Section */
.parameters {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.param-group {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
}

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

.param-header label {
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.param-value {
    font-weight: 700;
    color: var(--pixel-green);
    font-size: 0.95rem;
    min-width: 3.5rem;
    text-align: right;
    font-family: var(--font-mono);
    padding: 2px 6px;
    background: var(--pixel-green-light);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(107, 170, 62, 0.2);
}

.param-slider {
    width: 100%;
    height: 6px;
    border-radius: 2px;
    background: var(--bg-secondary);
    background-image: repeating-linear-gradient(
        90deg,
        var(--bg-secondary) 0px,
        var(--bg-secondary) 3px,
        rgba(107, 170, 62, 0.1) 3px,
        rgba(107, 170, 62, 0.1) 4px
    );
    outline: none;
    -webkit-appearance: none;
    appearance: none;
    cursor: pointer;
}

.param-slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 4px;
    background: var(--pixel-green);
    cursor: pointer;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.param-slider::-webkit-slider-thumb:hover {
    background: var(--pixel-green-hover);
    transform: scale(1.1);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3);
}

.param-slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 4px;
    background: var(--pixel-green);
    cursor: pointer;
    border: none;
    transition: all 0.2s;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

.param-slider::-moz-range-thumb:hover {
    background: var(--pixel-green-hover);
    transform: scale(1.1);
    box-shadow: 0 3px 6px rgba(0, 0, 0, 0.3);
}

.param-labels {
    display: flex;
    justify-content: space-between;
    margin-top: var(--spacing-xs);
    font-size: 0.75rem;
    color: var(--text-tertiary);
}

/* Preview Panel (Right) */
.preview-panel {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    display: flex;
    flex-direction: column;
    height: 100%; /* Inherit parent element height */
}

.preview-container {
    display: flex;
    flex-direction: column;
    margin-bottom: var(--spacing-xl);
}

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

.preview-header-actions {
    display: flex;
    gap: 12px;
    align-items: center;
}

.preview-header h3 {
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--text-primary);
}

.preview-info {
    font-size: 0.875rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.preview-canvas {
    position: relative;
    width: 100%;
    max-height: 70vh; /* Fixed max-height for consistent layout */
    min-height: 400px; /* Minimum height for smaller images */
    background-color: var(--bg-tertiary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    border: 1px solid var(--border-color);
}

#mainCanvas {
    display: none;
    max-width: 100%;
    max-height: 100%; /* Fit to container height */
    width: auto;
    height: auto;
    object-fit: contain;

    /* Force pixelated rendering - Multi-layer protection */
    image-rendering: -moz-crisp-edges;         /* Firefox */
    image-rendering: -webkit-crisp-edges;      /* Chrome */
    image-rendering: pixelated;                /* Chrome + Safari */
    image-rendering: crisp-edges;              /* Standard property */

    /* Ensure pixelation in all cases */
    -ms-interpolation-mode: nearest-neighbor;  /* IE/Edge */

    background-color: #ffffff;  /* Keep white background for better image viewing */
}

.preview-placeholder {
    display: block;
    text-align: center;
    color: var(--text-tertiary);
}

.preview-placeholder .placeholder-icon {
    font-size: 4rem;
    display: block;
    margin-bottom: var(--spacing-md);
}

.preview-placeholder p {
    font-size: 1rem;
    font-weight: 500;
}

/* Download Options */
.download-options {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
    flex-shrink: 0; /* 防止被压缩 */
}

.download-btn {
    width: 100%;
    padding: var(--spacing-lg);
    background: var(--pixel-gradient);
    color: white;
    border: none;
    border-radius: var(--radius-sm);
    font-size: 1.125rem;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    transition: all 0.2s;
    box-shadow: var(--shadow-pixel);
}

.download-btn:hover:not(:disabled) {
    transform: translateY(-2px);
    box-shadow: 6px 6px 0 rgba(107, 170, 62, 0.5);
}

.download-btn:disabled {
    background: var(--bg-secondary);
    color: var(--text-tertiary);
    cursor: not-allowed;
    box-shadow: none;
}

.btn-icon {
    font-size: 1.25rem;
    image-rendering: pixelated;
}

.btn-text {
    font-size: 1.125rem;
}

.reset-actions {
    display: flex;
    justify-content: center;
}

.reset-btn {
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: transparent;
    color: var(--text-secondary);
    border: 2px solid var(--border-color);
    border-radius: var(--radius-sm);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.reset-btn:hover {
    border-color: var(--pixel-green);
    color: var(--pixel-green);
    background-color: var(--bg-tertiary);
}

/* View Full Size Button */
.view-fullsize-btn {
    background: transparent;
    border: 2px solid var(--pixel-green);
    color: var(--pixel-green);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-sm);
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.view-fullsize-btn:hover {
    background-color: var(--pixel-green);
    color: white;
    transform: translateY(-1px);
    box-shadow: 0 2px 4px rgba(107, 170, 62, 0.3);
}

.view-fullsize-btn:active {
    transform: translateY(0);
}

/* ===================================
   How It Works Section
   =================================== */

.how-it-works-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background-color: var(--bg-primary);
}

.steps-container {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    max-width: 1200px;
    margin: 0 auto;
}

.step {
    flex: 1;
    text-align: center;
    padding: var(--spacing-xl);
}

.step-icon-img {
    width: 80px;
    height: 80px;
    object-fit: contain;
    margin: 0 auto var(--spacing-md);
    display: block;
}

.step h3 {
    font-size: 1.25rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.step p {
    color: var(--text-secondary);
    line-height: 1.6;
}

.step-arrow {
    font-size: 2rem;
    color: var(--pixel-green);
    font-weight: 700;
}

/* ===================================
   Features Section
   =================================== */

.features-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background-color: var(--bg-secondary);
}

.features-list {
    max-width: 1200px;
    margin: 0 auto;
}

.feature-row {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
    align-items: center;
    padding: var(--spacing-2xl) 0;
    min-height: 400px;
}

.feature-row-reverse {
    direction: rtl;
}

.feature-row-reverse .feature-content {
    direction: ltr;
}

.feature-content {
    padding: var(--spacing-lg);
}

.feature-content h3 {
    font-size: 1.75rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.3;
    margin-bottom: var(--spacing-md);
}

.feature-content p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1.05rem;
}

.feature-image {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-lg);
}

.feature-image img {
    width: 100%;
    max-width: 500px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    transition: transform 0.3s, box-shadow 0.3s;
}

.feature-image img:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.feature-divider {
    height: 1px;
    background: linear-gradient(
        to right,
        transparent,
        rgba(107, 170, 62, 0.15) 20%,
        rgba(107, 170, 62, 0.15) 80%,
        transparent
    );
    margin: var(--spacing-xl) 0;
}

/* Responsive for features */
@media (max-width: 968px) {
    .feature-row {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        padding: var(--spacing-xl) 0;
        min-height: auto;
    }

    .feature-row-reverse {
        direction: ltr;
    }

    .feature-row-reverse .feature-content {
        direction: ltr;
    }

    .feature-image {
        order: -1;
    }

    .feature-content h3 {
        font-size: 1.5rem;
    }

    .feature-content p {
        font-size: 1rem;
    }
}

/* ===================================
   Why Choose Us Section
   =================================== */

.why-choose-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background-color: var(--bg-primary);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.benefit-item {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    text-align: center;
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
    border: 1px solid rgba(0, 0, 0, 0.05);
}

.benefit-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-lg);
}

.benefit-icon-img {
    width: 64px;
    height: 64px;
    object-fit: contain;
    margin: 0 auto var(--spacing-md) auto;
    display: block;
}

.benefit-item h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    line-height: 1.4;
}

.benefit-item p {
    color: var(--text-secondary);
    line-height: 1.6;
    font-size: 0.95rem;
}

/* Responsive for benefits */
@media (max-width: 968px) {
    .benefits-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: var(--spacing-lg);
    }
}

@media (max-width: 640px) {
    .benefits-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .benefit-item {
        padding: var(--spacing-lg);
    }
}

/* ===================================
   Showcase Section - Grid Layout
   =================================== */

.showcase-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background-color: var(--bg-secondary);
}

.showcase-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    grid-template-rows: repeat(4, var(--height-showcase-grid-item));
    gap: var(--spacing-md);
    max-width: var(--maxwidth-showcase);
    margin: 0 auto var(--spacing-xl);
}

.showcase-item {
    background-color: var(--bg-primary);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: all 0.3s;
}

.showcase-item:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-xl);
}

/* Precise positioning for each element */
/* Column 1: span-3 + span-1 */
.showcase-item:nth-child(1) {
    grid-column: 1;
    grid-row: 1 / 4;
}

.showcase-item:nth-child(2) {
    grid-column: 1;
    grid-row: 4 / 5;
}

/* Column 2: span-2 + span-2 */
.showcase-item:nth-child(3) {
    grid-column: 2;
    grid-row: 1 / 3;
}

.showcase-item:nth-child(4) {
    grid-column: 2;
    grid-row: 3 / 5;
}

/* Column 3: span-3 + span-1 */
.showcase-item:nth-child(5) {
    grid-column: 3;
    grid-row: 1 / 4;
}

.showcase-item:nth-child(6) {
    grid-column: 3;
    grid-row: 4 / 5;
}

/* Column 4: span-2 + span-2 */
.showcase-item:nth-child(7) {
    grid-column: 4;
    grid-row: 1 / 3;
}

.showcase-item:nth-child(8) {
    grid-column: 4;
    grid-row: 3 / 5;
}

.showcase-placeholder {
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
}

.showcase-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}

.showcase-item:hover .showcase-placeholder img {
    transform: scale(1.05);
}

.showcase-keywords {
    text-align: center;
    padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-xl);
}

.keywords-title {
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    font-family: var(--font-sans);
}

.keywords-tags {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: var(--spacing-sm);
    max-width: 1200px;
    margin: 0 auto;
}

.keyword-tag {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-md);
    background-color: var(--bg-secondary);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    color: var(--text-secondary);
}

/* 响应式设计 */
@media (max-width: 1200px) {
    .showcase-grid {
        grid-template-columns: repeat(3, 1fr);
        grid-template-rows: repeat(6, 110px);
    }

    .showcase-item:nth-child(1) { grid-column: 1; grid-row: 1 / 4; }
    .showcase-item:nth-child(2) { grid-column: 1; grid-row: 4 / 5; }
    .showcase-item:nth-child(3) { grid-column: 2; grid-row: 1 / 3; }
    .showcase-item:nth-child(4) { grid-column: 2; grid-row: 3 / 5; }
    .showcase-item:nth-child(5) { grid-column: 3; grid-row: 1 / 4; }
    .showcase-item:nth-child(6) { grid-column: 3; grid-row: 4 / 5; }
    .showcase-item:nth-child(7) { grid-column: 1; grid-row: 5 / 7; }
    .showcase-item:nth-child(8) { grid-column: 2; grid-row: 5 / 7; }
}

@media (max-width: 768px) {
    .showcase-grid {
        grid-template-columns: repeat(2, 1fr);
        grid-template-rows: repeat(8, 100px);
        gap: var(--spacing-sm);
    }

    .showcase-item:nth-child(1) { grid-column: 1; grid-row: 1 / 4; }
    .showcase-item:nth-child(2) { grid-column: 1; grid-row: 4 / 5; }
    .showcase-item:nth-child(3) { grid-column: 2; grid-row: 1 / 3; }
    .showcase-item:nth-child(4) { grid-column: 2; grid-row: 3 / 5; }
    .showcase-item:nth-child(5) { grid-column: 1; grid-row: 5 / 8; }
    .showcase-item:nth-child(6) { grid-column: 1; grid-row: 8 / 9; }
    .showcase-item:nth-child(7) { grid-column: 2; grid-row: 5 / 7; }
    .showcase-item:nth-child(8) { grid-column: 2; grid-row: 7 / 9; }
}

@media (max-width: 480px) {
    .showcase-grid {
        grid-template-columns: 1fr;
        grid-template-rows: repeat(8, 150px);
        max-width: 400px;
    }

    .showcase-item:nth-child(1) { grid-column: 1; grid-row: 1 / 2; }
    .showcase-item:nth-child(2) { grid-column: 1; grid-row: 2 / 3; }
    .showcase-item:nth-child(3) { grid-column: 1; grid-row: 3 / 4; }
    .showcase-item:nth-child(4) { grid-column: 1; grid-row: 4 / 5; }
    .showcase-item:nth-child(5) { grid-column: 1; grid-row: 5 / 6; }
    .showcase-item:nth-child(6) { grid-column: 1; grid-row: 6 / 7; }
    .showcase-item:nth-child(7) { grid-column: 1; grid-row: 7 / 8; }
    .showcase-item:nth-child(8) { grid-column: 1; grid-row: 8 / 9; }

    .keywords-title {
        font-size: 1.1rem;
    }

    .keyword-tag {
        font-size: 0.75rem;
        padding: var(--spacing-xs) var(--spacing-sm);
    }
}

/* ===================================
   FAQ Section
   =================================== */

.faq-section {
    padding: var(--spacing-3xl) var(--spacing-lg);
    background-color: var(--bg-primary);
}

.faq-grid {
    display: grid;
    grid-template-columns: 1fr;
    gap: var(--spacing-sm);
    max-width: var(--maxwidth-content);
    margin: 0 auto;
}

.faq-item {
    overflow: hidden;
    transition: all 0.3s ease;
}

.faq-question {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-md) 0;
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    background: none;
    border: none;
    cursor: pointer;
    text-align: left;
    transition: all 0.2s ease;
}

.faq-question:hover {
    color: var(--pixel-green);
}

.faq-question span:first-child {
    flex: 1;
    padding-right: var(--spacing-sm);
}

.faq-icon {
    font-size: 1.5rem;
    font-weight: 400;
    color: var(--pixel-green);
    transition: transform 0.3s ease;
    flex-shrink: 0;
    margin-left: var(--spacing-sm);
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0;
}

.faq-item.active .faq-answer {
    max-height: 500px;
    padding: 0 0 var(--spacing-lg) 0;
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.faq-answer p:last-child {
    margin-bottom: 0;
}

.faq-answer strong {
    color: var(--text-primary);
}

/* ===================================
   CTA Section
   =================================== */

.cta-section {
    position: relative;
    padding: var(--spacing-3xl) var(--spacing-lg);
    text-align: center;
    min-height: 400px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.cta-bg {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: url('../assets/footor-bg-4.png');
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
    z-index: 1;
}

.cta-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    z-index: 2;
}

.cta-content {
    position: relative;
    z-index: 3;
}

.cta-content h2 {
    font-size: 2.5rem;
    color: white;
    margin-bottom: var(--spacing-md);
}

.cta-content > p {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xl);
}

.cta-section .btn-primary {
    background: var(--pixel-gradient);
    color: white;
    margin-bottom: var(--spacing-md);
    box-shadow: 0 4px 0 rgba(107, 170, 62, 0.4);
    min-width: 200px;
    max-width: 280px;
}

.cta-section .btn-primary:hover {
    background: var(--pixel-gradient);
    transform: translateY(-2px);
    box-shadow: 0 6px 0 rgba(107, 170, 62, 0.5);
}

.cta-section .btn-primary:active {
    transform: translateY(2px);
    box-shadow: 0 2px 0 rgba(107, 170, 62, 0.4);
}

.cta-note {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

/* ===================================
   Toast Notification
   =================================== */

.toast {
    position: fixed;
    bottom: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%) translateY(100px);
    background-color: var(--text-primary);
    color: white;
    padding: var(--spacing-md) var(--spacing-xl);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    opacity: 0;
    transition: all 0.3s;
    z-index: 2000;
    max-width: 400px;
}

.toast.show {
    transform: translateX(-50%) translateY(0);
    opacity: 1;
}

.toast.success {
    background-color: var(--pixel-green, #6BAA3E);
}

.toast.error {
    background-color: var(--error-color, #EF4444);
}

.toast.warning {
    background-color: var(--warning-color, #F59E0B);
}

/* ===================================
   Footer
   =================================== */

.footer {
    background-color: var(--bg-dark);
    color: var(--text-light);
    padding: var(--spacing-2xl) var(--spacing-lg) var(--spacing-lg);
    position: relative;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto var(--spacing-xl);
}

.footer-section h4 {
    color: white;
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
    position: relative;
    padding-bottom: var(--spacing-sm);
}

.footer-section p {
    color: var(--text-light);
    line-height: 1.6;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: var(--spacing-sm);
}

.footer-section a {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.2s;
}

.footer-section a:hover {
    color: var(--pixel-green);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-tertiary);
    font-size: 0.875rem;
    position: relative;
}

/* ===================================
   Responsive Design
   =================================== */

@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-wrapper {
        gap: var(--spacing-2xl);
    }

    .hero-content h1 {
        font-size: 2.5rem;
    }

    .workspace {
        grid-template-columns: 1fr;
    }

    .steps-container {
        flex-direction: column;
    }

    .step-arrow {
        transform: rotate(90deg);
    }
}

@media (max-width: 768px) {
    .hero {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .hero-title {
        font-size: 2rem;
    }

    .hero-description {
        font-size: 1rem;
    }

    .hero-cta {
        flex-direction: column;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-links {
        gap: var(--spacing-sm);
    }

    .nav-links a {
        font-size: 0.875rem;
    }

    .section-header h2 {
        font-size: 2rem;
    }

    /* Hero Responsive */
    .hero-wrapper {
        grid-template-columns: 1fr;
        gap: var(--spacing-2xl);
    }

    .hero-left {
        text-align: center;
    }

    .hero-content h1 {
        font-size: 2.2rem;
    }

    .hero-content p {
        font-size: 1rem;
    }

    .hero-demo-image {
        max-width: 100%;
    }

    .faq-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 640px) {
    .nav {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .nav-links {
        flex-wrap: wrap;
        justify-content: center;
    }

    .palette-options {
        grid-template-columns: 1fr;
    }
}

/* ===================================
   Legal Pages (Privacy Policy & Terms)
   =================================== */

.legal-section {
    padding: var(--spacing-3xl) var(--spacing-lg) var(--spacing-2xl);
    background-color: var(--bg-primary);
    min-height: 60vh;
}

.legal-container {
    max-width: 900px;
    margin: 0 auto;
}

.legal-container h1 {
    font-family: var(--font-pixel);
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.2;
}

.last-updated {
    color: var(--text-secondary);
    font-size: 0.875rem;
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.legal-content {
    margin-top: var(--spacing-2xl);
}

.policy-section {
    margin-bottom: var(--spacing-2xl);
}

.policy-section h2 {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-top: var(--spacing-xl);
    margin-bottom: var(--spacing-md);
}

.policy-section h3 {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-sm);
}

.policy-section p,
.policy-section li {
    color: var(--text-secondary);
    line-height: 1.7;
    margin-bottom: var(--spacing-sm);
}

.policy-section ul {
    margin-left: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
}

.policy-section li {
    margin-bottom: var(--spacing-xs);
}

.policy-section strong {
    color: var(--text-primary);
    font-weight: 600;
}

.policy-section a {
    color: var(--pixel-green);
    text-decoration: underline;
}

.policy-section a:hover {
    text-decoration: none;
}

.legal-footer {
    margin-top: var(--spacing-3xl);
    padding-top: var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    text-align: center;
}

/* Nav Links Active State */
.nav-links a.active {
    color: var(--pixel-green);
    font-weight: 600;
}

/* Responsive Design for Legal Pages */
@media (max-width: 768px) {
    .legal-container h1 {
        font-size: 2rem;
    }

    .policy-section h2 {
        font-size: 1.25rem;
    }

    .policy-section h3 {
        font-size: 1.1rem;
    }

    .policy-section ul {
        margin-left: var(--spacing-md);
    }
}

@media (max-width: 480px) {
    .legal-section {
        padding: var(--spacing-2xl) var(--spacing-md);
    }

    .legal-container h1 {
        font-size: 1.75rem;
    }

    .policy-section ul {
        margin-left: var(--spacing-sm);
        padding-left: var(--spacing-sm);
    }
}