/* i推助手 - 产品宣传页面样式 */

/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    /* 品牌色系 */
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #3b82f6;
    --secondary: #0ea5e9;
    --accent: #f59e0b;
    --accent-hover: #d97706;
    
    /* 功能色 */
    --success: #10b981;
    --warning: #f59e0b;
    --danger: #ef4444;
    --info: #06b6d4;
    
    /* 中性色 */
    --gray-50: #f8fafc;
    --gray-100: #f1f5f9;
    --gray-200: #e2e8f0;
    --gray-300: #cbd5e1;
    --gray-400: #94a3b8;
    --gray-500: #64748b;
    --gray-600: #475569;
    --gray-700: #334155;
    --gray-800: #1e293b;
    --gray-900: #0f172a;
    
    /* 背景色 */
    --bg-primary: #ffffff;
    --bg-secondary: #f8fafc;
    --bg-dark: #0f172a;
    
    /* 文字色 */
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-light: #94a3b8;
    --text-white: #ffffff;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-glow: 0 0 40px -10px var(--primary);
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 间距 */
    --space-xs: 4px;
    --space-sm: 8px;
    --space-md: 16px;
    --space-lg: 24px;
    --space-xl: 32px;
    --space-2xl: 48px;
    --space-3xl: 64px;
    --space-4xl: 96px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* 通用容器 */
.container {
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--space-lg);
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: var(--space-sm);
    padding: 12px 28px;
    font-size: 15px;
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all var(--transition-normal);
    border: none;
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-white);
    box-shadow: 0 4px 14px 0 rgba(37, 99, 235, 0.39);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(37, 99, 235, 0.5);
}

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

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

.btn-accent {
    background: linear-gradient(135deg, var(--accent) 0%, #fbbf24 100%);
    color: var(--text-white);
    box-shadow: 0 4px 14px 0 rgba(245, 158, 11, 0.39);
}

.btn-accent:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px 0 rgba(245, 158, 11, 0.5);
}

.btn-large {
    padding: 16px 40px;
    font-size: 17px;
}

/* 头部导航 */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--gray-200);
    transition: all var(--transition-normal);
}

.header.scrolled {
    box-shadow: var(--shadow-md);
}

.header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 72px;
}

.logo {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    text-decoration: none;
}

.logo-icon {
    width: 42px;
    height: 42px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    color: var(--text-white);
    font-weight: 700;
}

.logo-text {
    font-size: 24px;
    font-weight: 800;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--space-xl);
    list-style: none;
}

.nav-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 15px;
    transition: color var(--transition-fast);
    position: relative;
}

.nav-menu a:hover {
    color: var(--primary);
}

.nav-menu a::after {
    content: '';
    position: absolute;
    bottom: -4px;
    left: 0;
    width: 0;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    transition: width var(--transition-normal);
}

.nav-menu a:hover::after {
    width: 100%;
}

.header-actions {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.menu-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
    padding: var(--space-sm);
}

.menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all var(--transition-normal);
}

/* Hero区域 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding-top: 72px;
    background: linear-gradient(135deg, var(--bg-secondary) 0%, #e0f2fe 50%, var(--bg-secondary) 100%);
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 800px;
    height: 800px;
    background: radial-gradient(circle, rgba(37, 99, 235, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero::after {
    content: '';
    position: absolute;
    bottom: -30%;
    left: -10%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(14, 165, 233, 0.1) 0%, transparent 70%);
    border-radius: 50%;
}

.hero-inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    max-width: 600px;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: var(--space-sm);
    background: rgba(37, 99, 235, 0.1);
    color: var(--primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--space-lg);
}

.hero-badge .dot {
    width: 8px;
    height: 8px;
    background: var(--success);
    border-radius: 50%;
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
}

.hero-title {
    font-size: 56px;
    font-weight: 800;
    line-height: 1.1;
    margin-bottom: var(--space-lg);
    color: var(--text-primary);
}

.hero-title .highlight {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 18px;
    color: var(--text-secondary);
    margin-bottom: var(--space-xl);
    line-height: 1.8;
}

.hero-stats {
    display: flex;
    gap: var(--space-2xl);
    margin-bottom: var(--space-xl);
}

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

.stat-number {
    font-size: 32px;
    font-weight: 800;
    color: var(--primary);
    display: block;
}

.stat-label {
    font-size: 14px;
    color: var(--text-secondary);
}

.hero-actions {
    display: flex;
    gap: var(--space-md);
    flex-wrap: wrap;
}

.hero-image {
    position: relative;
}

.hero-image-main {
    width: 100%;
    max-width: 600px;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-xl);
    position: relative;
    z-index: 1;
}

.floating-card {
    position: absolute;
    background: var(--bg-primary);
    padding: var(--space-md);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    display: flex;
    align-items: center;
    gap: var(--space-md);
    animation: float 3s ease-in-out infinite;
}

.floating-card.card-1 {
    top: 10%;
    right: -20px;
    animation-delay: 0s;
}

.floating-card.card-2 {
    bottom: 20%;
    left: -30px;
    animation-delay: 1s;
}

.floating-card.card-3 {
    bottom: 5%;
    right: 10%;
    animation-delay: 2s;
}

@keyframes float {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-10px); }
}

.floating-icon {
    width: 48px;
    height: 48px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.floating-icon.blue { background: linear-gradient(135deg, #3b82f6, #06b6d4); }
.floating-icon.green { background: linear-gradient(135deg, #10b981, #34d399); }
.floating-icon.orange { background: linear-gradient(135deg, #f59e0b, #fbbf24); }

.floating-text {
    font-size: 14px;
    font-weight: 600;
    color: var(--text-primary);
}

.floating-text small {
    display: block;
    font-size: 12px;
    color: var(--text-secondary);
    font-weight: 400;
}

/* 功能特性区域 */
.features {
    padding: var(--space-4xl) 0;
    background: var(--bg-primary);
}

.section-header {
    text-align: center;
    max-width: 700px;
    margin: 0 auto var(--space-3xl);
}

.section-tag {
    display: inline-block;
    background: linear-gradient(135deg, rgba(37, 99, 235, 0.1) 0%, rgba(14, 165, 233, 0.1) 100%);
    color: var(--primary);
    padding: var(--space-sm) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 14px;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.section-title {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.feature-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    transition: all var(--transition-normal);
    border: 1px solid transparent;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
    border-color: var(--gray-200);
    background: var(--bg-primary);
}

.feature-icon {
    width: 64px;
    height: 64px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    margin-bottom: var(--space-lg);
}

.feature-icon.blue { background: linear-gradient(135deg, #dbeafe, #bfdbfe); }
.feature-icon.green { background: linear-gradient(135deg, #d1fae5, #a7f3d0); }
.feature-icon.purple { background: linear-gradient(135deg, #ede9fe, #ddd6fe); }
.feature-icon.orange { background: linear-gradient(135deg, #ffedd5, #fed7aa); }
.feature-icon.pink { background: linear-gradient(135deg, #fce7f3, #fbcfe8); }
.feature-icon.cyan { background: linear-gradient(135deg, #cffafe, #a5f3fc); }

.feature-title {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    color: var(--text-primary);
}

.feature-desc {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 工作流程 */
.workflow {
    padding: var(--space-4xl) 0;
    background: var(--bg-dark);
    color: var(--text-white);
}

.workflow .section-title {
    color: var(--text-white);
}

.workflow .section-desc {
    color: var(--gray-400);
}

.workflow-steps {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
    position: relative;
}

.workflow-steps::before {
    content: '';
    position: absolute;
    top: 40px;
    left: 12.5%;
    right: 12.5%;
    height: 2px;
    background: linear-gradient(90deg, var(--primary), var(--secondary));
    z-index: 0;
}

.workflow-step {
    text-align: center;
    position: relative;
    z-index: 1;
}

.step-number {
    width: 80px;
    height: 80px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
    font-weight: 800;
    margin: 0 auto var(--space-lg);
    box-shadow: 0 0 30px rgba(37, 99, 235, 0.5);
}

.step-title {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: var(--space-sm);
}

.step-desc {
    font-size: 14px;
    color: var(--gray-400);
    line-height: 1.6;
}

/* 核心功能展示 */
.showcase {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

.showcase-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-4xl);
    align-items: center;
    margin-bottom: var(--space-4xl);
}

.showcase-item:last-child {
    margin-bottom: 0;
}

.showcase-item.reverse {
    direction: rtl;
}

.showcase-item.reverse > * {
    direction: ltr;
}

.showcase-content {
    max-width: 520px;
}

.showcase-tag {
    display: inline-block;
    background: var(--primary);
    color: var(--text-white);
    padding: var(--space-xs) var(--space-md);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.showcase-title {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: var(--space-md);
    color: var(--text-primary);
}

.showcase-desc {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

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

.showcase-list li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-size: 15px;
    color: var(--text-primary);
}

.showcase-list li::before {
    content: '✓';
    width: 24px;
    height: 24px;
    background: var(--success);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    flex-shrink: 0;
}

.showcase-image {
    position: relative;
}

.showcase-image img {
    width: 100%;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-xl);
}

/* 数据统计 */
.stats {
    padding: var(--space-3xl) 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-white);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-xl);
    text-align: center;
}

.stats-item {
    padding: var(--space-lg);
}

.stats-number {
    font-size: 48px;
    font-weight: 800;
    margin-bottom: var(--space-sm);
}

.stats-label {
    font-size: 16px;
    opacity: 0.9;
}

/* 客户评价 */
.testimonials {
    padding: var(--space-4xl) 0;
    background: var(--bg-primary);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
}

.testimonial-card {
    background: var(--bg-secondary);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    transition: all var(--transition-normal);
}

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

.testimonial-rating {
    color: var(--accent);
    font-size: 18px;
    margin-bottom: var(--space-md);
}

.testimonial-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: var(--space-lg);
}

.testimonial-author {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.author-avatar {
    width: 48px;
    height: 48px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    font-weight: 700;
    font-size: 18px;
}

.author-info h4 {
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

.author-info p {
    font-size: 13px;
    color: var(--text-secondary);
}

/* 定价方案 */
.pricing {
    padding: var(--space-4xl) 0;
    background: var(--bg-secondary);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl);
    max-width: 1000px;
    margin: 0 auto;
}

.pricing-card {
    background: var(--bg-primary);
    border-radius: var(--radius-lg);
    padding: var(--space-2xl);
    border: 2px solid var(--gray-200);
    transition: all var(--transition-normal);
    position: relative;
}

.pricing-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

.pricing-card.featured {
    border-color: var(--primary);
    transform: scale(1.05);
}

.pricing-card.featured:hover {
    transform: scale(1.05) translateY(-8px);
}

.pricing-badge {
    position: absolute;
    top: -12px;
    left: 50%;
    transform: translateX(-50%);
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text-white);
    padding: var(--space-xs) var(--space-lg);
    border-radius: var(--radius-full);
    font-size: 12px;
    font-weight: 600;
}

.pricing-name {
    font-size: 20px;
    font-weight: 700;
    margin-bottom: var(--space-sm);
    text-align: center;
}

.pricing-price {
    text-align: center;
    margin-bottom: var(--space-lg);
}

.pricing-price .currency {
    font-size: 24px;
    font-weight: 600;
    vertical-align: top;
}

.pricing-price .amount {
    font-size: 48px;
    font-weight: 800;
}

.pricing-price .period {
    font-size: 14px;
    color: var(--text-secondary);
}

.pricing-features {
    list-style: none;
    margin-bottom: var(--space-xl);
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    margin-bottom: var(--space-md);
    font-size: 14px;
    color: var(--text-secondary);
}

.pricing-features li.included::before {
    content: '✓';
    width: 20px;
    height: 20px;
    background: var(--success);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 10px;
    flex-shrink: 0;
}

.pricing-features li.not-included::before {
    content: '×';
    width: 20px;
    height: 20px;
    background: var(--gray-300);
    color: var(--text-white);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    flex-shrink: 0;
}

.pricing-card .btn {
    width: 100%;
}

/* FAQ */
.faq {
    padding: var(--space-4xl) 0;
    background: var(--bg-primary);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    border-bottom: 1px solid var(--gray-200);
    padding: var(--space-lg) 0;
}

.faq-question {
    display: flex;
    align-items: center;
    justify-content: space-between;
    cursor: pointer;
    font-size: 17px;
    font-weight: 600;
    color: var(--text-primary);
}

.faq-icon {
    width: 24px;
    height: 24px;
    transition: transform var(--transition-normal);
}

.faq-item.active .faq-icon {
    transform: rotate(180deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height var(--transition-normal);
}

.faq-item.active .faq-answer {
    max-height: 500px;
}

.faq-answer p {
    padding-top: var(--space-md);
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

/* CTA区域 */
.cta {
    padding: var(--space-4xl) 0;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: var(--text-white);
    text-align: center;
}

.cta-title {
    font-size: 40px;
    font-weight: 800;
    margin-bottom: var(--space-md);
}

.cta-desc {
    font-size: 18px;
    opacity: 0.9;
    margin-bottom: var(--space-xl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

.cta-actions {
    display: flex;
    gap: var(--space-md);
    justify-content: center;
    flex-wrap: wrap;
}

.cta .btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-white);
    border-color: rgba(255, 255, 255, 0.3);
}

.cta .btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* 页脚 */
.footer {
    background: var(--bg-dark);
    color: var(--text-white);
    padding: var(--space-4xl) 0 var(--space-xl);
}

.footer-grid {
    display: grid;
    grid-template-columns: 2fr repeat(3, 1fr);
    gap: var(--space-3xl);
    margin-bottom: var(--space-3xl);
}

.footer-brand .logo-text {
    color: var(--text-white);
    -webkit-text-fill-color: var(--text-white);
}

.footer-brand p {
    color: var(--gray-400);
    font-size: 14px;
    line-height: 1.8;
    margin: var(--space-md) 0 var(--space-lg);
}

.footer-social {
    display: flex;
    gap: var(--space-md);
}

.footer-social a {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--text-white);
    text-decoration: none;
    transition: all var(--transition-fast);
}

.footer-social a:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

.footer-column h4 {
    font-size: 16px;
    font-weight: 700;
    margin-bottom: var(--space-lg);
}

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

.footer-links li {
    margin-bottom: var(--space-sm);
}

.footer-links a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-fast);
}

.footer-links a:hover {
    color: var(--text-white);
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: var(--space-xl);
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--space-md);
}

.footer-bottom p {
    color: var(--gray-400);
    font-size: 14px;
}

.footer-bottom-links {
    display: flex;
    gap: var(--space-lg);
}

.footer-bottom-links a {
    color: var(--gray-400);
    text-decoration: none;
    font-size: 14px;
    transition: color var(--transition-fast);
}

.footer-bottom-links a:hover {
    color: var(--text-white);
}

/* 返回顶部 */
.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary);
    color: var(--text-white);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 20px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-lg);
    z-index: 999;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    background: var(--primary-dark);
    transform: translateY(-4px);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-inner {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-content {
        max-width: 100%;
    }
    
    .hero-stats {
        justify-content: center;
    }
    
    .hero-actions {
        justify-content: center;
    }
    
    .hero-image {
        display: none;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .workflow-steps {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .workflow-steps::before {
        display: none;
    }
    
    .showcase-item {
        grid-template-columns: 1fr;
        gap: var(--space-2xl);
    }
    
    .showcase-item.reverse {
        direction: ltr;
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .pricing-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
    }
    
    .pricing-card.featured {
        transform: none;
    }
    
    .pricing-card.featured:hover {
        transform: translateY(-8px);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .menu-toggle {
        display: flex;
    }
    
    .header-actions .btn {
        display: none;
    }
    
    .hero-title {
        font-size: 36px;
    }
    
    .section-title {
        font-size: 28px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .workflow-steps {
        grid-template-columns: 1fr;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
    }
    
    .footer-bottom {
        flex-direction: column;
        text-align: center;
    }
    
    .cta-title {
        font-size: 28px;
    }
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.animate-fadeInUp {
    animation: fadeInUp 0.6s ease forwards;
}

/* 滚动显示动画 */
.reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.6s ease;
}

.reveal.active {
    opacity: 1;
    transform: translateY(0);
}

/* 无JavaScript时的回退显示 */
.no-js .reveal,
.reveal.no-animation {
    opacity: 1;
    transform: translateY(0);
}

/* 打印时显示所有元素 */
@media print {
    .reveal {
        opacity: 1 !important;
        transform: translateY(0) !important;
    }
}