/* 
 * Quest2Do.com - GTD Assistant Website Styles
 * Modern, responsive design with subtle animations
 */

/* CSS Reset and Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* Primary Colors - GTD Assistant Brand */
    --primary-blue: #007AFF;
    --primary-blue-light: #5AC8FA;
    --primary-blue-dark: #0051D5;
    
    /* Secondary Colors */
    --success-green: #34C759;
    --warning-orange: #FF9500;
    --error-red: #FF3B30;
    --special-purple: #AF52DE;
    
    /* Neutral Colors */
    --text-primary: #1D1D1F;
    --text-secondary: #86868B;
    --text-tertiary: #86868B80;
    --background-primary: #FFFFFF;
    --background-secondary: #F5F5F7;
    --background-tertiary: #FBFBFD;
    --border-color: #D2D2D7;
    
    /* Typography */
    --font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-weight-regular: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 1.5rem;
    --spacing-lg: 2rem;
    --spacing-xl: 3rem;
    --spacing-xxl: 4rem;
    
    /* Border Radius */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* Shadows */
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --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);
    
    /* Transitions */
    --transition-fast: 0.15s ease-out;
    --transition-normal: 0.3s ease-out;
    --transition-slow: 0.5s ease-out;
}

/* Base Typography */
body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-primary);
    overflow-x: hidden;
}

/* Headings */
h1, h2, h3, h4, h5, h6 {
    font-weight: var(--font-weight-bold);
    line-height: 1.2;
    margin-bottom: var(--spacing-sm);
}

h1 { font-size: clamp(2rem, 5vw, 3.5rem); }
h2 { font-size: clamp(1.75rem, 4vw, 2.5rem); }
h3 { font-size: clamp(1.5rem, 3vw, 2rem); }
h4 { font-size: 1.25rem; }

/* Links */
a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: color var(--transition-fast);
}

a:hover {
    color: var(--primary-blue-dark);
}

/* Container */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-md);
    font-weight: var(--font-weight-medium);
    text-decoration: none;
    transition: all var(--transition-fast);
    cursor: pointer;
    border: none;
    font-size: 1rem;
    min-height: 48px;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-light));
    color: white;
    box-shadow: var(--shadow-md);
}

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

.btn-secondary {
    background: transparent;
    color: var(--primary-blue);
    border: 2px solid var(--primary-blue);
}

.btn-secondary:hover {
    background: var(--primary-blue);
    color: white;
    transform: translateY(-2px);
}

/* Language Switcher */
.language-switcher {
    position: fixed;
    top: 20px;
    right: 20px;
    z-index: 1001;
    background: rgba(255, 255, 255, 0.95);
    padding: 8px 16px;
    border-radius: 20px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    backdrop-filter: blur(10px);
}

.lang-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 14px;
    font-weight: 500;
    transition: color 0.3s ease;
    padding: 4px 8px;
}

.lang-link:hover {
    color: var(--primary-blue);
}

.lang-link.active {
    color: var(--primary-blue);
    font-weight: 600;
}

.lang-divider {
    color: var(--text-tertiary);
    margin: 0 4px;
}

/* Mobile responsive for language switcher */
@media (max-width: 768px) {
    .language-switcher {
        top: 10px;
        right: 10px;
        padding: 6px 12px;
        font-size: 12px;
    }
    
    .lang-link {
        font-size: 12px;
        padding: 2px 4px;
    }
}

/* Navigation */
.navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    z-index: 1000;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid var(--border-color);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

.logo-img {
    width: 32px;
    height: 32px;
    border-radius: 6px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.logo-text {
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-lg);
}

.nav-link {
    color: var(--text-primary);
    font-weight: var(--font-weight-medium);
    transition: color var(--transition-fast);
}

.nav-link:hover {
    color: var(--primary-blue);
}

/* Mobile Navigation */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
}

.bar {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition-fast);
}

/* Hero Section */
.hero {
    padding: calc(80px + var(--spacing-xxl)) 0 var(--spacing-xxl);
    background: linear-gradient(135deg, var(--background-primary) 0%, var(--background-secondary) 100%);
    overflow: hidden;
    position: relative;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 50%;
    height: 100%;
    background: linear-gradient(135deg, transparent 0%, rgba(0, 122, 255, 0.05) 100%);
    z-index: 1;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xxl);
    align-items: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    margin-bottom: var(--spacing-md);
    background: linear-gradient(135deg, var(--text-primary), var(--primary-blue));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary-blue), var(--special-purple));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    line-height: 1.6;
}

.hero-features {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-xl);
}

.feature-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-xs) var(--spacing-sm);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    font-size: 0.9rem;
    font-weight: var(--font-weight-medium);
}

.feature-icon {
    font-size: 1.2rem;
}

.hero-cta {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}

.device-mockup {
    position: relative;
    max-width: 400px;
    width: 100%;
}

/* Hero区域特定的设备模型 - 分设备控制 */
.hero-device-mockup {
    max-width: 220px; /* iPhone默认宽度 */
    transition: max-width 0.3s ease; /* 平滑过渡 */
}

/* iPad模式下的容器 */
.hero-device-mockup.ipad-mode {
    max-width: 500px; /* iPad截图容器更宽 */
}

/* Mac模式下的容器 */
.hero-device-mockup.mac-mode {
    max-width: 650px; /* Mac截图容器最宽 */
}

/* 首屏截图分别控制 */
.hero-device-mockup .iphone-screenshots .hero-screenshot {
    width: auto;
    height: 320px; /* iPhone竖屏截图 */
    object-fit: contain;
    max-width: 100%;
}

.hero-device-mockup .ipad-screenshots .hero-screenshot {
    width: 480px; /* iPad横屏截图 */
    height: auto;
    object-fit: contain;
    max-width: 100%;
}

.hero-device-mockup .mac-screenshots .hero-screenshot {
    width: 600px; /* Mac横屏截图，最大显示 */
    height: auto;
    object-fit: contain;
    max-width: 100%;
}

.app-screenshot {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
}

/* Hero区域截图样式 */
.hero-screenshot {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    cursor: pointer;
    transition: transform 0.2s ease;
}

.hero-screenshot:hover {
    transform: scale(1.02);
}

/* 设备截图显示控制 - 默认显示iPhone截图 */
.device-screenshots.ipad-screenshots,
.device-screenshots.mac-screenshots {
    display: none;
}

.device-screenshots.iphone-screenshots {
    display: block;
}

.device-screenshots.active {
    display: block;
}

/* iPad截图默认隐藏 */
.ipad-screenshots {
    display: none;
}

/* 首屏设备切换器位置调整 */
.hero-image .device-switcher {
    margin-top: 0; /* 完全移除顶部间距 */
    margin-bottom: var(--spacing-sm); /* 减少与截图的间距 */
}

/* 调整app-showcase的间距，为设备切换器腾出空间 */
.hero-image .app-showcase {
    gap: var(--spacing-md); /* 减少app-showcase内部间距 */
}

/* App Icon Styles */
.app-showcase {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-xl);
}

.app-icon-hero {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-lg);
}

.app-icon-large {
    width: 120px;
    height: 120px;
    border-radius: 24px;
    box-shadow: var(--shadow-lg);
}

.app-icon-medium {
    width: 80px;
    height: 80px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

.app-info h3 {
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-primary);
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
}

.app-info p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 1rem;
}

.download-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.app-icon-download {
    flex-shrink: 0;
}

.download-text {
    text-align: left;
}

/* Features Section */
.features {
    padding: var(--spacing-xxl) 0;
    background: var(--background-tertiary);
}

.section-header {
    text-align: center;
    margin-bottom: var(--spacing-xxl);
}

.section-title {
    margin-bottom: var(--spacing-sm);
}

.section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
}

.feature-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

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

.feature-icon-large {
    font-size: 3rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.feature-card h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.375rem;
}

.feature-card p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    line-height: 1.6;
}

.feature-list {
    list-style: none;
}

.feature-list li {
    position: relative;
    padding-left: var(--spacing-md);
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.feature-list li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--success-green);
    font-weight: var(--font-weight-bold);
}

/* GTD Stages Layout */
.gtd-stage {
    margin-bottom: var(--spacing-xxl);
    border-radius: var(--radius-lg);
    background: white;
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-color);
}

.stage-header {
    display: flex;
    align-items: center;
    margin-bottom: var(--spacing-xl);
    padding-bottom: var(--spacing-md);
    border-bottom: 2px solid var(--border-color);
}

.stage-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-blue), var(--primary-blue-light));
    color: white;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    font-weight: var(--font-weight-bold);
    margin-right: var(--spacing-md);
    box-shadow: var(--shadow-md);
}

.stage-info h3 {
    margin: 0 0 var(--spacing-xs) 0;
    color: var(--text-primary);
    font-size: 1.5rem;
}

.stage-info p {
    margin: 0;
    color: var(--text-secondary);
    font-size: 1rem;
}

.stage-features {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-lg);
}

.stage-features .feature-card {
    margin: 0;
    background: var(--background-tertiary);
    border: 1px solid var(--border-light);
}

.feature-icon {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.stage-features .feature-card h4 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.25rem;
    font-weight: var(--font-weight-semibold);
}

/* Platform Features Section */
.platform-features {
    margin-top: var(--spacing-xxl);
    padding: var(--spacing-xl);
    background: linear-gradient(135deg, var(--background-secondary), var(--background-tertiary));
    border-radius: var(--radius-lg);
    text-align: center;
}

.platform-header {
    margin-bottom: var(--spacing-xl);
}

.platform-header h3 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-size: 1.5rem;
}

.platform-header p {
    color: var(--text-secondary);
    font-size: 1rem;
}

.platform-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: var(--spacing-lg);
}

.platform-card {
    background: white;
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: all var(--transition-normal);
    border: 1px solid var(--border-color);
}

.platform-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.platform-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-md);
    display: block;
}

.platform-card h4 {
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-size: 1.125rem;
    font-weight: var(--font-weight-semibold);
}

.platform-card p {
    color: var(--text-secondary);
    font-size: 0.9rem;
    line-height: 1.5;
    margin: 0;
}

/* Screenshots Section */
.screenshots {
    padding: var(--spacing-xxl) 0;
    background: white;
}

.screenshots-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.screenshot-item {
    text-align: center;
}

.screenshot-item img {
    width: 100%;
    max-width: 300px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-md);
    transition: transform var(--transition-normal);
}

.screenshot-item img:hover {
    transform: scale(1.02);
}

.screenshot-item h4 {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.screenshot-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* GTD Screenshots Workflow */
.gtd-screenshots-stage {
    margin-bottom: var(--spacing-xxl);
    padding: var(--spacing-xl);
    background: var(--background-tertiary);
    border-radius: var(--radius-xl);
}

.stage-screenshots-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.stage-screenshots-header h3 {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-size: 1.5rem;
    font-weight: var(--font-weight-semibold);
}

.stage-screenshots-header p {
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 700px;
    margin: 0 auto;
}

.screenshots-workflow {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

.screenshot-step {
    position: relative;
    text-align: center;
    flex: 0 0 220px;
    max-width: 240px;
}

.screenshot-step img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    margin-bottom: var(--spacing-sm);
    transition: transform var(--transition-normal);
}

.screenshot-step img:hover {
    transform: scale(1.05);
}

.step-number {
    position: absolute;
    top: -10px;
    left: -10px;
    width: 40px;
    height: 40px;
    border-radius: 50%;
    background: white;
    color: var(--primary-blue);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.1rem;
    font-weight: 900;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25), 0 0 0 3px var(--primary-blue);
    z-index: 2;
}

.screenshot-step h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
    font-weight: var(--font-weight-semibold);
}

.screenshot-step p {
    color: var(--text-secondary);
    font-size: 0.85rem;
    line-height: 1.4;
}

.workflow-arrow {
    font-size: 1.5rem;
    color: var(--primary-blue);
    font-weight: var(--font-weight-bold);
    margin: 0 var(--spacing-xs);
    flex-shrink: 0;
}

/* AI澄清流程特殊样式 */
.clarify-section {
    margin-bottom: var(--spacing-xl);
}

.section-subtitle {
    font-size: 1.3rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    font-weight: var(--font-weight-semibold);
    text-align: center;
}

.gtd-workflow-card {
    background: linear-gradient(135deg, rgba(52, 199, 89, 0.02), rgba(0, 122, 255, 0.02));
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-top: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
    border: 1.5px solid rgba(0, 122, 255, 0.08);
    transition: all 0.3s ease;
}

.gtd-workflow-card:hover {
    border-color: rgba(0, 122, 255, 0.15);
    box-shadow: 0 2px 12px rgba(0, 122, 255, 0.08);
}

.gtd-workflow-card h5 {
    font-size: 1.1rem;
    margin: 0 0 var(--spacing-md) 0;
    color: var(--text-primary);
    font-weight: 600;
}

.ai-clarify-section {
    background: linear-gradient(135deg, rgba(0, 122, 255, 0.03), rgba(175, 82, 222, 0.03));
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin-top: var(--spacing-xxl);
    border: 2px solid rgba(0, 122, 255, 0.1);
}

.pro-badge-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
}

.pro-badge {
    background: linear-gradient(135deg, #FF9500, #FF6B00);
    color: white;
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.85rem;
    font-weight: var(--font-weight-bold);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    box-shadow: 0 2px 8px rgba(255, 149, 0, 0.3);
}

.ai-clarify-intro {
    text-align: center;
    color: var(--text-secondary);
    font-size: 1rem;
    max-width: 800px;
    margin: 0 auto var(--spacing-xl) auto;
    line-height: 1.6;
}

.ai-workflow {
    flex-wrap: wrap;
    justify-content: center;
}

.ai-workflow .screenshot-step {
    flex: 0 0 auto;
}

.step-number.ai-step {
    background: white;
    color: var(--primary-purple);
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25), 0 0 0 3px var(--primary-purple);
}

.ai-clarify-benefits {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.5);
    border-radius: var(--radius-lg);
}

.ai-clarify-benefits h5 {
    font-size: 1.2rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    text-align: center;
    font-weight: var(--font-weight-semibold);
}

.benefits-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    list-style: none;
    padding: 0;
    margin: 0;
}

.benefits-grid li {
    background: white;
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.benefits-grid li:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.benefit-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.benefits-grid strong {
    display: block;
    font-size: 0.95rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
    font-weight: var(--font-weight-semibold);
}

.benefits-grid p {
    font-size: 0.85rem;
    color: var(--text-secondary);
    line-height: 1.4;
    margin: 0;
}

.screenshots-grid-dual {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-lg);
}

.screenshots-grid-single {
    display: flex;
    justify-content: center;
    margin-top: var(--spacing-lg);
}

.screenshots-grid-single .screenshot-item {
    max-width: 320px;
}

/* Feature Showcase */
.feature-showcase {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: var(--spacing-xl);
    align-items: center;
    margin: var(--spacing-xl) 0;
    padding: var(--spacing-xl);
    background: var(--background-tertiary);
    border-radius: var(--radius-xl);
}

.feature-showcase.reverse {
    grid-template-columns: 1fr 1.2fr;
}

.feature-showcase.reverse .showcase-content {
    order: 2;
}

.feature-showcase.reverse .showcase-images {
    order: 1;
}

.showcase-content h3 {
    font-size: 1.8rem;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    font-weight: var(--font-weight-bold);
}

.showcase-content p {
    font-size: 1.1rem;
    line-height: 1.6;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

.showcase-features {
    list-style: none;
    margin: 0;
    padding: 0;
}

.showcase-features li {
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.showcase-images {
    display: flex;
    flex-direction: row;
    gap: var(--spacing-lg);
    align-items: center;
    justify-content: center;
    position: relative;
}

/* 两个截图并排 */
.showcase-main,
.showcase-secondary {
    width: 48%;
    max-width: 280px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
}

.showcase-main:hover,
.showcase-secondary:hover {
    transform: scale(1.03) translateY(-3px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

/* 三个截图并排 */
.showcase-images.triple {
    gap: var(--spacing-md);
}

.showcase-images.triple .showcase-item {
    width: 31%;
    max-width: 200px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.showcase-images.triple .showcase-item:hover {
    transform: scale(1.03) translateY(-3px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

/* 两个截图并排 - 保持与三个截图相同的尺寸 */
.showcase-images.dual {
    gap: var(--spacing-lg);
    justify-content: center;
}

.showcase-images.dual .showcase-item {
    width: 31%;
    max-width: 200px;
    height: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-normal);
    cursor: pointer;
}

.showcase-images.dual .showcase-item:hover {
    transform: scale(1.03) translateY(-3px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

/* 统一所有截图的预览大小 */
.screenshot-item img,
.screenshot-step img,
.showcase-item,
.pomodoro-feature img {
    cursor: pointer;
    transition: all var(--transition-normal);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
}

/* iPhone截图统一尺寸 */
.device-screenshots.iphone-screenshots .screenshot-item img,
.device-screenshots.iphone-screenshots .screenshot-step img,
.device-screenshots.iphone-screenshots .showcase-item,
.device-screenshots.iphone-screenshots .pomodoro-feature img {
    width: 100%;
    max-width: 200px;
    height: auto;
}

/* iPad截图统一尺寸 */
.device-screenshots.ipad-screenshots .screenshot-item img,
.device-screenshots.ipad-screenshots .screenshot-step img,
.device-screenshots.ipad-screenshots .showcase-item,
.device-screenshots.ipad-screenshots .pomodoro-feature img {
    width: 100%;
    max-width: 220px;
    height: auto;
}

/* Mac截图统一尺寸 - 桌面端使用更大尺寸 */
.device-screenshots.mac-screenshots .screenshot-item img,
.device-screenshots.mac-screenshots .screenshot-step img,
.device-screenshots.mac-screenshots .showcase-item,
.device-screenshots.mac-screenshots .pomodoro-feature img {
    width: 100%;
    max-width: 280px;
    height: auto;
}

/* 为没有设备容器的截图设置默认尺寸（iPhone尺寸） */
.screenshot-item img:not(.device-screenshots *),
.screenshot-step img:not(.device-screenshots *),
.showcase-item:not(.device-screenshots *),
.pomodoro-feature img:not(.device-screenshots *) {
    width: 100%;
    max-width: 200px;
    height: auto;
}

/* 通用悬停效果 */
.screenshot-item img:hover,
.screenshot-step img:hover,
.showcase-item:hover,
.pomodoro-feature img:hover {
    transform: scale(1.03) translateY(-3px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.12);
}

/* 重写容器尺寸以适配统一截图大小 */
.screenshot-step {
    position: relative;
    text-align: center;
    flex: 0 0 auto;
    max-width: none;
}

.device-screenshots.iphone-screenshots .screenshot-step {
    width: 200px;
}

.device-screenshots.ipad-screenshots .screenshot-step {
    width: 220px;
}

.device-screenshots.mac-screenshots .screenshot-step {
    width: 280px;
}

/* Screenshots responsive */
@media (max-width: 768px) {
    .screenshots-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
    }
    
    .feature-showcase {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }
    
    .feature-showcase.reverse .showcase-content,
    .feature-showcase.reverse .showcase-images {
        order: unset;
    }
    
    .showcase-content h3 {
        font-size: 1.5rem;
    }
    
    /* 移动端保持并排但缩小尺寸 */
    .showcase-images {
        flex-direction: row;
        gap: var(--spacing-sm);
        padding: 0 var(--spacing-sm);
    }
    
    .showcase-main {
        width: 48%;
        max-width: 180px;
    }
    
    .showcase-secondary {
        width: 48%;
        max-width: 180px;
    }
    
    /* 三个截图在移动端 */
    .showcase-images.triple {
        gap: var(--spacing-xs);
        padding: 0;
    }
    
    .showcase-images.triple .showcase-item {
        width: 32%;
        max-width: 150px;
    }
    
    .showcase-images.dual .showcase-item {
        width: 45%;
        max-width: 150px;
    }
    
    /* 移动端统一截图尺寸 */
    .device-screenshots.iphone-screenshots .screenshot-item img,
    .device-screenshots.iphone-screenshots .screenshot-step img,
    .device-screenshots.iphone-screenshots .showcase-item,
    .device-screenshots.iphone-screenshots .pomodoro-feature img {
        max-width: 150px;
    }
    
    .device-screenshots.ipad-screenshots .screenshot-item img,
    .device-screenshots.ipad-screenshots .screenshot-step img,
    .device-screenshots.ipad-screenshots .showcase-item,
    .device-screenshots.ipad-screenshots .pomodoro-feature img {
        max-width: 170px;
    }

    .device-screenshots.mac-screenshots .screenshot-item img,
    .device-screenshots.mac-screenshots .screenshot-step img,
    .device-screenshots.mac-screenshots .showcase-item,
    .device-screenshots.mac-screenshots .pomodoro-feature img {
        max-width: 200px;
    }

    .device-screenshots.iphone-screenshots .screenshot-step {
        width: 150px;
    }

    .device-screenshots.ipad-screenshots .screenshot-step {
        width: 170px;
    }

    .device-screenshots.mac-screenshots .screenshot-step {
        width: 200px;
    }

}

/* 番茄钟完整展示 */
.feature-showcase-full {
    background: var(--background-tertiary);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    margin: var(--spacing-xl) 0;
}

.showcase-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.showcase-header h3 {
    font-size: 1.8rem;
    font-weight: var(--font-weight-bold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
}

.showcase-header p {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    max-width: 800px;
    margin: 0 auto;
}

/* 主要展示行 */
.showcase-main-row {
    margin-bottom: var(--spacing-xl);
}

/* 高级功能行 */
.showcase-advanced-row {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.pomodoro-feature {
    text-align: center;
}

.pomodoro-feature img {
    width: 100%;
    max-width: 180px;
    height: auto;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    margin-bottom: var(--spacing-sm);
    transition: transform var(--transition-normal);
}

.pomodoro-feature img:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-md);
}

.pomodoro-feature h4 {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.pomodoro-feature p {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* 功能特性网格 */
.showcase-features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.feature-column h5 {
    font-size: 1rem;
    font-weight: var(--font-weight-semibold);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.feature-column ul {
    list-style: none;
    padding: 0;
    margin: 0;
}

.feature-column li {
    font-size: 0.9rem;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .showcase-advanced-row {
        grid-template-columns: repeat(3, 1fr);
        gap: var(--spacing-sm);
    }
    
    .pomodoro-feature img {
        max-width: 100px;
    }
    
    .pomodoro-feature h4 {
        font-size: 0.85rem;
    }
    
    .pomodoro-feature p {
        font-size: 0.75rem;
    }
    
    .showcase-features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
    
    .feature-column h5 {
        font-size: 0.95rem;
    }
    
    .feature-column li {
        font-size: 0.85rem;
    }
}

/* Testimonials Section */
.testimonials {
    padding: var(--spacing-xxl) 0;
    background: var(--background-secondary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-xl);
}

.testimonial-card {
    background: white;
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    position: relative;
}

.testimonial-card::before {
    content: '"';
    position: absolute;
    top: var(--spacing-md);
    left: var(--spacing-xl);
    font-size: 4rem;
    color: var(--primary-blue);
    opacity: 0.2;
    line-height: 1;
}

.testimonial-content {
    margin-bottom: var(--spacing-md);
    position: relative;
    z-index: 1;
}

.testimonial-content p {
    font-style: italic;
    color: var(--text-secondary);
    line-height: 1.6;
}

.testimonial-author strong {
    color: var(--text-primary);
    display: block;
    margin-bottom: var(--spacing-xs);
}

.testimonial-author span {
    color: var(--text-tertiary);
    font-size: 0.9rem;
}

/* Download Section */
.download {
    padding: var(--spacing-xxl) 0;
    background: linear-gradient(135deg, #1e90ff 0%, #00bfff 100%);
    color: white;
    text-align: center;
}

.download-content {
    max-width: 1200px;
    margin: 0 auto;
}

.download-header {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.app-icon-download {
    flex-shrink: 0;
}

.app-icon-medium {
    width: 120px;
    height: 120px;
    border-radius: 26px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.download-text {
    text-align: left;
}

.download .section-title {
    color: white;
    font-size: 2rem;
    margin-bottom: var(--spacing-xs);
}

.download .section-subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1rem;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    margin: var(--spacing-xl) 0;
    flex-wrap: wrap;
}

.download-btn {
    display: inline-block;
    transition: transform var(--transition-fast);
}

.download-btn img {
    height: 60px;
    width: auto;
}

.download-btn:hover {
    transform: scale(1.05);
}

.download-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-xxl);
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.info-item {
    background: rgba(255, 255, 255, 0.15);
    backdrop-filter: blur(10px);
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    text-align: center;
    transition: all var(--transition-normal);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.info-item:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-4px);
}

.info-item.pro-highlight {
    background: linear-gradient(135deg, #fff9e6 0%, #ffffff 100%);
    border: 2px solid #ffd700;
    box-shadow: 0 4px 16px rgba(255, 215, 0, 0.5), 0 0 20px rgba(255, 215, 0, 0.2);
}

.info-item.pro-highlight:hover {
    background: linear-gradient(135deg, #fffbf0 0%, #ffffff 100%);
    box-shadow: 0 8px 24px rgba(255, 215, 0, 0.6), 0 0 30px rgba(255, 215, 0, 0.3);
    transform: translateY(-6px);
}

.info-item.pro-highlight .info-label {
    color: #1a1a1a;
}

.info-item.pro-highlight .info-desc {
    color: #333;
}

.info-icon {
    font-size: 2rem;
    display: block;
    margin-bottom: var(--spacing-sm);
}

.info-label {
    display: block;
    font-weight: var(--font-weight-semibold);
    font-size: 1.125rem;
    margin-bottom: var(--spacing-xs);
    color: white;
}

.pro-price-tag {
    display: inline-block;
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    color: #333;
    padding: 0.25rem 0.75rem;
    border-radius: 16px;
    font-size: 0.875rem;
    font-weight: var(--font-weight-bold);
    margin-left: var(--spacing-xs);
}

.info-desc {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.85);
    line-height: 1.5;
}

.download-cta {
    margin-top: var(--spacing-xl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid rgba(255, 255, 255, 0.2);
}

.cta-text {
    color: white;
    font-size: 1rem;
    font-weight: 500;
}

.cta-link {
    color: white;
    font-weight: var(--font-weight-semibold);
    text-decoration: underline;
    transition: opacity var(--transition-fast);
}

.cta-link:hover {
    opacity: 0.8;
}

/* Contact Section */
.contact {
    padding: var(--spacing-xxl) 0;
    background: var(--background-tertiary);
}

.contact-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

.contact h2 {
    margin-bottom: var(--spacing-sm);
}

.contact p {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xl);
    font-size: 1.125rem;
}

.contact-methods {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    text-align: left;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.contact-icon {
    font-size: 1.5rem;
    margin-top: 0.25rem;
}

.contact-item strong {
    display: block;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.contact-item p {
    color: var(--text-secondary);
    margin: 0;
    font-size: 0.9rem;
}

/* Footer */
.footer {
    background: var(--text-primary);
    color: white;
    padding: var(--spacing-xxl) 0 var(--spacing-lg);
}

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

.footer-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.footer-logo-img {
    width: 24px;
    height: 24px;
    border-radius: 5px;
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.1);
}

.footer-logo-text {
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    font-size: 0.9rem;
}

.footer-section h4 {
    margin-bottom: var(--spacing-md);
    font-size: 1rem;
}

.footer-links {
    list-style: none;
}

.footer-links li {
    margin-bottom: var(--spacing-xs);
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
    font-size: 0.9rem;
}

.footer-links a:hover {
    color: white;
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-link {
    color: rgba(255, 255, 255, 0.7);
    transition: color var(--transition-fast);
    font-size: 0.9rem;
}

.social-link:hover {
    color: white;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--spacing-lg);
    text-align: center;
}

.footer-bottom p {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.8rem;
    margin: 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    /* Navigation */
    .nav-menu {
        position: fixed;
        left: -100%;
        top: 70px;
        flex-direction: column;
        background-color: white;
        width: 100%;
        text-align: center;
        transition: var(--transition-normal);
        box-shadow: var(--shadow-lg);
        padding: var(--spacing-lg) 0;
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active .bar:nth-child(2) {
        opacity: 0;
    }

    .hamburger.active .bar:nth-child(1) {
        transform: translateY(8px) rotate(45deg);
    }

    .hamburger.active .bar:nth-child(3) {
        transform: translateY(-8px) rotate(-45deg);
    }

    /* Hero */
    .hero-container {
        grid-template-columns: 1fr;
        gap: var(--spacing-lg);
        text-align: center;
    }

    .hero-image {
        order: -1;
    }
    
    /* App Icon Responsive */
    .app-icon-hero {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-sm);
    }
    
    .app-icon-large {
        width: 100px;
        height: 100px;
        border-radius: 20px;
    }
    
    .download-header {
        flex-direction: column;
        gap: var(--spacing-md);
        text-align: center;
    }

    .download-text {
        text-align: center;
    }

    .download .section-title {
        font-size: 1.5rem;
    }

    .app-icon-medium {
        width: 100px;
        height: 100px;
        border-radius: 22px;
    }

    .download-info {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }

    .info-item {
        padding: var(--spacing-md);
    }

    /* Features */
    .features-grid {
        grid-template-columns: 1fr;
    }

    /* GTD Stages */
    .stage-header {
        flex-direction: column;
        align-items: flex-start;
        text-align: left;
    }
    
    .stage-number {
        margin-right: 0;
        margin-bottom: var(--spacing-sm);
    }
    
    .stage-features {
        grid-template-columns: 1fr;
    }
    
    .platform-grid {
        grid-template-columns: 1fr;
    }

    /* GTD Screenshots Workflow */
    .screenshots-workflow {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    .workflow-arrow {
        transform: rotate(90deg);
        font-size: 2rem;
        margin: var(--spacing-sm) 0;
    }

    .screenshot-step {
        flex: none;
        max-width: 280px;
    }

    .screenshots-grid-dual {
        grid-template-columns: 1fr;
    }

    /* AI澄清流程移动端优化 */
    .ai-clarify-section {
        padding: var(--spacing-md);
    }

    .ai-clarify-intro {
        font-size: 0.9rem;
        padding: 0 var(--spacing-xs);
    }

    .benefits-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-sm);
    }

    .ai-workflow {
        gap: var(--spacing-md);
    }

    .ai-workflow .screenshot-step {
        width: 100%;
        max-width: 250px;
        margin: 0 auto;
    }

    /* Contact */
    .contact-methods {
        grid-template-columns: 1fr;
    }

    /* Buttons */
    .hero-cta {
        justify-content: center;
    }

    .btn {
        min-width: 200px;
    }
}

@media (max-width: 480px) {
    :root {
        --spacing-md: 1rem;
        --spacing-lg: 1.25rem;
        --spacing-xl: 2rem;
        --spacing-xxl: 2.5rem;
    }

    .hero {
        padding: calc(80px + var(--spacing-lg)) 0 var(--spacing-lg);
    }

    .hero-features {
        flex-direction: column;
        align-items: center;
    }

    .download-buttons {
        flex-direction: column;
        align-items: center;
    }

    .download-info {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s ease-out;
}

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

.slide-in-left {
    animation: slideInLeft 0.6s ease-out;
}

@keyframes slideInLeft {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

.slide-in-right {
    animation: slideInRight 0.6s ease-out;
}

@keyframes slideInRight {
    from {
        opacity: 0;
        transform: translateX(20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

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

/* Device Switcher Styles */
.device-switcher {
    margin-top: var(--spacing-lg);
    text-align: center;
}

.device-tabs {
    display: inline-flex;
    background: var(--background-secondary);
    border-radius: var(--radius-lg);
    padding: 4px;
    margin-bottom: var(--spacing-md);
}

.device-tab {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm) var(--spacing-md);
    border: none;
    background: transparent;
    border-radius: var(--radius-md);
    font-family: var(--font-family);
    font-size: 1rem;
    font-weight: var(--font-weight-medium);
    color: var(--text-secondary);
    cursor: pointer;
    transition: all var(--transition-normal);
    min-width: 120px;
}

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

.device-tab.active {
    background: var(--background-primary);
    color: var(--primary-blue);
    box-shadow: var(--shadow-sm);
}

.device-icon {
    font-size: 1.2em;
}

.device-name {
    font-weight: var(--font-weight-semibold);
}

.device-description {
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0;
}

.description-iphone,
.description-ipad {
    transition: opacity var(--transition-normal);
}

/* Device Screenshots Container */
.device-screenshots {
    transition: opacity var(--transition-normal);
}

.device-screenshots.fade-out {
    opacity: 0;
}

/* Responsive Design for Device Switcher */
@media (max-width: 768px) {
    .device-tabs {
        width: 100%;
        max-width: 320px;
    }
    
    .device-tab {
        flex: 1;
        min-width: 0;
        padding: var(--spacing-sm);
    }
    
    .device-name {
        font-size: 0.9rem;
    }
}

/* ============================================
   Pro Features Section Styles
   ============================================ */

.pro-features-section {
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    padding: var(--spacing-xxl) 0;
}

.pro-features-section .section-header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
}

.pro-features-section .section-title {
    font-size: clamp(2rem, 4vw, 2.5rem);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
}

.pro-features-section .section-subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

/* Pro Value Proposition Cards */
.pro-value-proposition {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.value-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    box-shadow: var(--shadow-lg);
    transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

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

.value-card.primary {
    border-top: 4px solid var(--special-purple);
}

.value-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
    display: block;
}

.value-card h3 {
    font-size: 1.5rem;
    color: var(--text-primary);
    margin-bottom: var(--spacing-xs);
}

.value-headline {
    font-size: 1.125rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
    font-weight: var(--font-weight-medium);
}

.value-features {
    list-style: none;
    padding: 0;
}

.value-features li {
    padding: var(--spacing-xs) 0;
    padding-left: 1.5rem;
    position: relative;
    color: var(--text-primary);
    line-height: 1.6;
}

.value-features li::before {
    content: "✓";
    position: absolute;
    left: 0;
    color: var(--success-green);
    font-weight: var(--font-weight-bold);
}

/* AI Workflow Demo */
.ai-workflow-demo {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    box-shadow: var(--shadow-md);
}

.workflow-title {
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.workflow-steps {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
}

.workflow-step {
    flex: 1;
    min-width: 150px;
    background: var(--background-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    text-align: center;
    transition: transform var(--transition-fast);
}

.workflow-step:hover {
    transform: scale(1.02);
}

.workflow-step.pro-highlight {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.step-number {
    display: inline-block;
    width: 36px;
    height: 36px;
    line-height: 36px;
    border-radius: 50%;
    background: var(--primary-blue);
    color: white;
    font-weight: var(--font-weight-bold);
    margin-bottom: var(--spacing-xs);
}

.step-number.pro {
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    color: var(--text-primary);
}

.step-content h4 {
    font-size: 1rem;
    margin-bottom: var(--spacing-xs);
}

.step-content p {
    font-size: 0.875rem;
    line-height: 1.4;
}

.workflow-step.pro-highlight .step-content h4,
.workflow-step.pro-highlight .step-content p {
    color: white;
}

.workflow-arrow {
    font-size: 1.5rem;
    color: var(--text-secondary);
    flex-shrink: 0;
}

.pro-badge {
    display: inline-block;
    background: linear-gradient(135deg, #ffd700 0%, #ffed4e 100%);
    color: var(--text-primary);
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: var(--font-weight-bold);
    margin-left: 0.25rem;
}

/* Use Cases Grid */
.use-cases-grid {
    margin-bottom: var(--spacing-xl);
}

.use-cases-title {
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.use-case-card {
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-lg);
    margin-bottom: var(--spacing-md);
    box-shadow: var(--shadow-md);
    transition: transform var(--transition-normal);
}

.use-case-card:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.use-case-header {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-md);
    padding-bottom: var(--spacing-sm);
    border-bottom: 2px solid var(--background-secondary);
}

.use-case-icon {
    font-size: 2rem;
}

.use-case-header h4 {
    font-size: 1.25rem;
    color: var(--text-primary);
    margin: 0;
}

.use-case-scenario {
    color: var(--text-primary);
}

.scenario-task {
    font-size: 1rem;
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--background-tertiary);
    border-radius: var(--radius-sm);
}

.scenario-flow {
    display: grid;
    gap: var(--spacing-md);
}

.flow-step {
    background: var(--background-secondary);
    border-radius: var(--radius-sm);
    padding: var(--spacing-md);
}

.flow-label {
    display: inline-block;
    background: var(--primary-blue);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 16px;
    font-size: 0.875rem;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
}

.flow-step p {
    margin: 0.25rem 0;
    font-size: 0.9375rem;
    line-height: 1.6;
}

.scenario-result {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: linear-gradient(135deg, #e0f7fa 0%, #b2ebf2 100%);
    border-radius: var(--radius-sm);
    font-weight: var(--font-weight-medium);
}

/* Pricing Comparison Table */
.pricing-comparison {
    margin-bottom: var(--spacing-xl);
}

.comparison-title {
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.comparison-table-wrapper {
    overflow-x: auto;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    -webkit-overflow-scrolling: touch; /* 移动端流畅滚动 */
}

.comparison-table {
    width: 100%;
    min-width: 600px; /* 确保表格有最小宽度 */
    border-collapse: collapse;
    background: white;
}

.comparison-table thead {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.comparison-table th {
    padding: var(--spacing-md);
    text-align: center; /* 列标题居中 */
    font-weight: var(--font-weight-semibold);
    font-size: 1.125rem;
}

.comparison-table th:first-child {
    text-align: left; /* 第一列（功能类别）左对齐 */
}

.comparison-table td {
    padding: var(--spacing-md);
    border-bottom: 1px solid var(--border-color);
    text-align: center; /* 内容居中 */
    vertical-align: middle;
}

.comparison-table td:first-child {
    text-align: left; /* 第一列（功能类别）左对齐 */
}

.comparison-table tbody tr {
    transition: all 0.2s ease;
}

.comparison-table tbody tr:hover {
    background: var(--background-tertiary);
    transform: scale(1.01);
}

/* Pro列强调样式 */
.comparison-table .pro-column {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.08) 0%, rgba(118, 75, 162, 0.08) 100%);
    border-left: 3px solid #667eea; /* 左边框强调 */
    font-weight: var(--font-weight-medium);
}

.comparison-table thead .pro-column {
    background: linear-gradient(135deg, #5568d3 0%, #653b91 100%); /* 表头Pro列更深色 */
    border-left: none;
}

/* 高亮行样式 - 优先级更高 */
.comparison-table .highlight-row {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.15) 0%, rgba(118, 75, 162, 0.15) 100%);
}

.comparison-table .highlight-row td {
    font-weight: var(--font-weight-semibold);
    padding-top: calc(var(--spacing-md) + 4px);
    padding-bottom: calc(var(--spacing-md) + 4px);
}

/* 高亮行的Pro列 - 特殊强调 */
.comparison-table .highlight-row .pro-column {
    background: linear-gradient(135deg, rgba(102, 126, 234, 0.2) 0%, rgba(118, 75, 162, 0.2) 100%);
    border-left-width: 4px; /* 更粗的边框 */
}

.comparison-table .price-row {
    background: var(--background-secondary);
    font-weight: var(--font-weight-bold);
}

.price-tag {
    display: inline-block;
    padding: 0.25rem 0.75rem;
    border-radius: 16px;
    font-size: 1.25rem;
    font-weight: var(--font-weight-bold);
}

.price-tag.free {
    background: var(--success-green);
    color: white;
}

.price-tag.pro {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
}

.price-note {
    display: block;
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Pro FAQ */
.pro-faq {
    margin-bottom: var(--spacing-xl);
}

.faq-title {
    font-size: 1.75rem;
    text-align: center;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
}

.faq-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.faq-item {
    background: white;
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    box-shadow: var(--shadow-sm);
    transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.faq-item:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.faq-question {
    font-size: 1.125rem;
    color: var(--primary-blue);
    margin-bottom: var(--spacing-sm);
    font-weight: var(--font-weight-semibold);
}

.faq-answer {
    color: var(--text-primary);
    line-height: 1.6;
    margin: 0;
}

.faq-answer strong {
    color: var(--special-purple);
}

/* Pro CTA Section */
.pro-cta-section {
    text-align: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-xl);
}

.pro-cta-content h3 {
    font-size: 2rem;
    margin-bottom: var(--spacing-sm);
}

.pro-cta-content p {
    font-size: 1.125rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.cta-buttons {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--spacing-sm);
}

.btn-large {
    font-size: 1.25rem;
    padding: 1rem 2.5rem;
}

.cta-note {
    font-size: 0.875rem;
    opacity: 0.8;
    margin-top: 0.5rem;
}

/* Download Section Pro Enhancements */
.download-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-lg);
}

.info-item {
    background: var(--background-secondary);
    border-radius: var(--radius-md);
    padding: var(--spacing-md);
    transition: transform var(--transition-fast);
}

.info-item:hover {
    transform: translateY(-2px);
}

.info-icon {
    font-size: 1.5rem;
    display: block;
    margin-bottom: var(--spacing-xs);
}

.info-label {
    display: block;
    font-weight: var(--font-weight-semibold);
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.info-desc {
    display: block;
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.5;
}

.pro-price-tag {
    display: inline-block;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.875rem;
    font-weight: var(--font-weight-bold);
    margin-left: 0.25rem;
}

.download-cta {
    text-align: center;
    margin-top: var(--spacing-lg);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
}

.cta-text {
    font-size: 1rem;
    color: var(--text-secondary);
}

.cta-link {
    color: var(--primary-blue);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.cta-link:hover {
    color: var(--primary-blue-dark);
    text-decoration: underline;
}

/* Feature Badge */
.feature-badge {
    display: inline-block;
    background: var(--success-green);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: var(--font-weight-bold);
    margin-left: 0.5rem;
}

.pro-feature {
    border-left: 4px solid var(--special-purple);
}

.learn-more-link {
    display: inline-block;
    margin-top: var(--spacing-sm);
    color: var(--primary-blue);
    font-weight: var(--font-weight-semibold);
    text-decoration: none;
    transition: color var(--transition-fast);
}

.learn-more-link:hover {
    color: var(--primary-blue-dark);
}

/* Responsive Design for Pro Features */
@media (max-width: 768px) {
    .pro-features-section {
        padding: var(--spacing-lg) 0;
    }

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

    .workflow-arrow {
        transform: rotate(90deg);
        margin: var(--spacing-xs) 0;
    }

    .comparison-table {
        font-size: 0.875rem;
        min-width: 500px; /* 移动端缩小最小宽度 */
    }

    .comparison-table th,
    .comparison-table td {
        padding: var(--spacing-sm);
        font-size: 0.8125rem; /* 移动端字体更小 */
    }

    .comparison-table th {
        font-size: 0.9375rem; /* 表头字体稍大 */
    }

    /* 移动端隐藏部分文字，只显示图标 */
    .comparison-table td br {
        display: none; /* 移除换行，紧凑显示 */
    }

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

    .info-item {
        min-width: 100%;
    }
}

/* Print Styles */
@media print {
    .navbar,
    .download,
    .footer,
    .device-switcher {
        display: none;
    }

    .device-screenshots:not(.iphone-screenshots) {
        display: none !important;
    }

    body {
        font-size: 12pt;
        line-height: 1.5;
    }
}

/* ==================== GTD阶段导航侧边栏 ==================== */
.gtd-sidebar {
    position: fixed;
    right: 2rem;
    top: 50%;
    transform: translateY(-50%);
    z-index: 100;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 1rem;
    box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.3);
    transition: all 0.3s ease;
}

.gtd-sidebar:hover {
    box-shadow: 0 12px 40px rgba(0, 0, 0, 0.15);
}

.gtd-sidebar-title {
    font-size: 0.75rem;
    font-weight: 600;
    color: #666;
    text-align: center;
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.gtd-sidebar-nav {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.gtd-sidebar-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    border-radius: 10px;
    text-decoration: none;
    color: #666;
    transition: all 0.3s ease;
    font-size: 0.9rem;
    font-weight: 500;
    background: transparent;
}

.gtd-sidebar-item:hover {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    transform: translateX(-4px);
}

.gtd-sidebar-item.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.sidebar-icon {
    font-size: 1.2rem;
    flex-shrink: 0;
}

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

/* 子项样式 - 缩进显示层级关系 */
.gtd-sidebar-subitem {
    padding-left: 2rem;
    font-size: 0.85rem;
    opacity: 0.9;
}

.gtd-sidebar-subitem .sidebar-icon {
    font-size: 1rem;
}

.gtd-sidebar-subitem:hover {
    opacity: 1;
}

/* 响应式：移动端隐藏侧边栏 */
@media (max-width: 1024px) {
    .gtd-sidebar {
        display: none;
    }
}

/* ==================== 阶段设备切换器样式 ==================== */
.stage-device-switcher {
    display: flex;
    justify-content: center;
    gap: 0.5rem;
    margin-top: 1.5rem;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.5);
    backdrop-filter: blur(10px);
    border-radius: 12px;
    width: fit-content;
    margin-left: auto;
    margin-right: auto;
}

.stage-device-tab {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    background: transparent;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-size: 0.95rem;
    font-weight: 500;
    color: #666;
}

.stage-device-tab:hover {
    background: rgba(102, 126, 234, 0.1);
    color: #667eea;
}

.stage-device-tab.active {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    box-shadow: 0 4px 12px rgba(102, 126, 234, 0.3);
}

.stage-device-tab .device-icon {
    font-size: 1.2rem;
}

.stage-device-tab .device-name {
    font-weight: 600;
}

/* 移动端优化 */
@media (max-width: 768px) {
    .stage-device-switcher {
        width: 100%;
        flex-wrap: wrap;
    }

    .stage-device-tab {
        flex: 1;
        min-width: 100px;
        justify-content: center;
    }
}

/* ============================================
   图片查看器 (Lightbox) 样式
   ============================================ */

/* Lightbox容器 - 默认隐藏 */
.lightbox {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 9999;
    display: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

/* 激活状态 */
.lightbox.active {
    display: flex;
    align-items: center;
    justify-content: center;
}

.lightbox.visible {
    opacity: 1;
}

/* 遮罩层 */
.lightbox-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.95);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* 主容器 */
.lightbox-container {
    position: relative;
    width: 90%;
    height: 90%;
    max-width: 1400px;
    max-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 10000;
}

/* 关闭按钮 */
.lightbox-close {
    position: absolute;
    top: 20px;
    right: 20px;
    width: 48px;
    height: 48px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10002;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.lightbox-close:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: rotate(90deg);
}

.lightbox-close:active {
    transform: rotate(90deg) scale(0.9);
}

/* 导航按钮 */
.lightbox-prev,
.lightbox-next {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 56px;
    height: 56px;
    background: rgba(255, 255, 255, 0.1);
    border: none;
    border-radius: 50%;
    color: white;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10002;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.lightbox-prev {
    left: 20px;
}

.lightbox-next {
    right: 20px;
}

.lightbox-prev:hover,
.lightbox-next:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-50%) scale(1.1);
}

.lightbox-prev:active,
.lightbox-next:active {
    transform: translateY(-50%) scale(0.95);
}

/* 内容区域 */
.lightbox-content {
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 60px 80px 20px;
}

/* 图片容器 */
.lightbox-image {
    max-width: 100%;
    max-height: calc(100% - 80px);
    object-fit: contain;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.5);
    animation: lightboxImageFadeIn 0.3s ease;
}

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

/* 信息区域 */
.lightbox-info {
    width: 100%;
    max-width: 800px;
    margin-top: 20px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
}

/* 描述文字 */
.lightbox-description {
    color: rgba(255, 255, 255, 0.9);
    font-size: 16px;
    line-height: 1.6;
    text-align: center;
    padding: 12px 24px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    max-width: 100%;
}

/* 计数器 */
.lightbox-counter {
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    font-weight: 500;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.lightbox-counter .current-index {
    color: white;
    font-weight: 600;
}

/* 移动端优化 */
@media (max-width: 768px) {
    .lightbox-container {
        width: 100%;
        height: 100%;
        max-width: 100%;
        max-height: 100%;
    }

    .lightbox-content {
        padding: 80px 20px 20px;
    }

    .lightbox-close {
        top: 12px;
        right: 12px;
        width: 44px;
        height: 44px;
    }

    .lightbox-prev,
    .lightbox-next {
        width: 48px;
        height: 48px;
    }

    .lightbox-prev {
        left: 12px;
    }

    .lightbox-next {
        right: 12px;
    }

    .lightbox-description {
        font-size: 14px;
        padding: 10px 16px;
    }

    .lightbox-counter {
        font-size: 13px;
    }

    /* 移动端图片最大化显示 */
    .lightbox-image {
        max-height: calc(100% - 120px);
    }
}

/* 平板端优化 */
@media (min-width: 769px) and (max-width: 1024px) {
    .lightbox-content {
        padding: 60px 40px 20px;
    }

    .lightbox-prev {
        left: 16px;
    }

    .lightbox-next {
        right: 16px;
    }
}

/* 键盘导航提示（可选） */
.lightbox-keyboard-hint {
    position: absolute;
    bottom: 20px;
    left: 50%;
    transform: translateX(-50%);
    color: rgba(255, 255, 255, 0.5);
    font-size: 12px;
    text-align: center;
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.3s ease;
}

.lightbox.active .lightbox-keyboard-hint {
    opacity: 1;
    transition-delay: 1s;
}

/* 加载动画 */
.lightbox-loading {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 40px;
    height: 40px;
    border: 3px solid rgba(255, 255, 255, 0.2);
    border-top-color: white;
    border-radius: 50%;
    animation: lightboxSpin 0.8s linear infinite;
}

@keyframes lightboxSpin {
    to {
        transform: translate(-50%, -50%) rotate(360deg);
    }
}

/* 无缝过渡动画 */
.lightbox-image.transitioning {
    opacity: 0;
    transform: scale(0.95);
    transition: all 0.2s ease;
}