/* ========================================
   账小二官网样式
   ======================================== */

/* CSS 变量 */
:root {
    /* 主色调 */
    --color-primary: #6366F1;
    --color-primary-dark: #4F46E5;
    --color-primary-light: #818CF8;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #6366F1 0%, #8B5CF6 100%);
    --gradient-secondary: linear-gradient(135deg, #3B82F6 0%, #06B6D4 100%);
    --gradient-accent: linear-gradient(135deg, #F59E0B 0%, #EF4444 100%);
    
    /* 文字颜色 */
    --color-text-primary: #1F2937;
    --color-text-secondary: #4B5563;
    --color-text-tertiary: #6B7280;
    --color-text-light: #9CA3AF;
    
    /* 背景色 */
    --color-bg-white: #FFFFFF;
    --color-bg-light: #FFFFFF;
    --color-bg-gray: #FAFAFA;
    
    /* 边框 */
    --color-border: #E8E8E8;
    --color-border-light: #F0F0F0;
    
    /* 功能色 */
    --color-success: #10B981;
    --color-warning: #F59E0B;
    --color-error: #EF4444;
    
    /* 圆角 */
    --radius-sm: 6px;
    --radius-md: 10px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 8px -2px rgba(0, 0, 0, 0.06), 0 2px 4px -2px rgba(0, 0, 0, 0.04);
    --shadow-lg: 0 10px 20px -4px rgba(0, 0, 0, 0.08), 0 4px 6px -2px rgba(0, 0, 0, 0.04);
    --shadow-xl: 0 20px 30px -5px rgba(0, 0, 0, 0.08), 0 10px 10px -5px rgba(0, 0, 0, 0.03);
    --shadow-primary: 0 10px 40px -10px rgba(99, 102, 241, 0.4);
    
    /* 间距 */
    --space-xs: 0.5rem;
    --space-sm: 0.875rem;
    --space-md: 1.25rem;
    --space-lg: 1.75rem;
    --space-xl: 2.5rem;
    --space-2xl: 3.5rem;
    --space-3xl: 5rem;
    
    /* 字体 */
    --font-sans: 'Inter', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, sans-serif;
    
    /* 过渡 */
    --transition-fast: 150ms ease;
    --transition-base: 250ms ease;
    --transition-slow: 350ms ease;
}

/* 重置样式 */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    font-size: 16px;
    line-height: 1.6;
    color: var(--color-text-primary);
    background-color: var(--color-bg-white);
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

a {
    color: inherit;
    text-decoration: none;
}

ul, ol {
    list-style: none;
}

img {
    max-width: 100%;
    height: auto;
}

button {
    font-family: inherit;
    cursor: pointer;
    border: none;
    background: none;
}

input {
    font-family: inherit;
}

/* 容器 */
.container {
    width: 100%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--space-md);
}

/* ========================================
   导航栏
   ======================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.98);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

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

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

.logo-icon {
    width: 36px;
    height: 36px;
}

.logo-icon svg {
    width: 100%;
    height: 100%;
}

.logo-text {
    font-size: 1.25rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

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

.nav-link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-secondary);
    transition: all var(--transition-fast);
    position: relative;
    padding: 0.25rem 0;
}

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

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 1.5px;
    background: var(--color-primary);
    transition: width var(--transition-base);
    border-radius: 1px;
}

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

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

.mobile-toggle {
    display: none;
    flex-direction: column;
    gap: 5px;
    padding: 5px;
}

.mobile-toggle span {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--color-text-primary);
    border-radius: 2px;
    transition: all var(--transition-base);
}

/* ========================================
   按钮
   ======================================== */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.9375rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    transition: all var(--transition-fast);
}

.btn svg {
    flex-shrink: 0;
}

.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 14px -4px rgba(99, 102, 241, 0.4);
    transition: all 0.2s ease;
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px -4px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: white;
    color: var(--color-text-primary);
    border: 1px solid var(--color-border-light);
    box-shadow: var(--shadow-sm);
}

.btn-secondary:hover {
    background: white;
    border-color: var(--color-border);
    box-shadow: var(--shadow-md);
}

.btn-ghost {
    color: var(--color-text-secondary);
    background: transparent;
}

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

.btn-lg {
    padding: 0.875rem 1.75rem;
    font-size: 1rem;
}

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

.btn-white:hover {
    transform: translateY(-1px);
    box-shadow: var(--shadow-xl);
}

.btn-outline-white {
    background: transparent;
    color: white;
    border: 1px solid rgba(255, 255, 255, 0.5);
}

.btn-outline-white:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: white;
}

/* ========================================
   Hero 区域
   ======================================== */
.hero {
    position: relative;
    padding: calc(72px + var(--space-3xl)) 0 var(--space-3xl);
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
    overflow: hidden;
}

.gradient-orb {
    position: absolute;
    border-radius: 50%;
    filter: blur(80px);
    opacity: 0.5;
}

.orb-1 {
    width: 600px;
    height: 600px;
    background: #818CF8;
    top: -200px;
    right: -100px;
    opacity: 0.04;
}

.orb-2 {
    width: 500px;
    height: 500px;
    background: #A78BFA;
    bottom: -150px;
    left: -150px;
    opacity: 0.03;
}

.orb-3 {
    width: 400px;
    height: 400px;
    background: #67E8F9;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    opacity: 0.03;
}

.hero > .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: var(--space-2xl);
    align-items: center;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 0.875rem;
    background: rgba(99, 102, 241, 0.08);
    border: 1px solid rgba(99, 102, 241, 0.15);
    border-radius: var(--radius-full);
    font-size: 0.8125rem;
    font-weight: 500;
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.badge-icon {
    font-size: 1rem;
}

.hero-title {
    font-size: 3rem;
    font-weight: 700;
    line-height: 1.15;
    letter-spacing: -0.02em;
    margin-bottom: var(--space-md);
    color: var(--color-text-primary);
}

.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-desc {
    font-size: 1.0625rem;
    color: var(--color-text-tertiary);
    line-height: 1.7;
    max-width: 520px;
    margin-bottom: var(--space-xl);
}

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

.play-icon {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 24px;
    height: 24px;
    background: var(--gradient-primary);
    border-radius: 50%;
    color: white;
}

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

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

.stat-number {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--color-text-primary);
    line-height: 1;
    letter-spacing: -0.02em;
}

.stat-label {
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
    margin-top: 0.375rem;
}

/* 聊天演示 */
.hero-visual {
    position: relative;
}

.chat-demo {
    background: white;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--color-border-light);
    overflow: hidden;
    max-width: 440px;
    margin-left: auto;
}

.chat-header {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-md);
    background: linear-gradient(to right, rgba(99, 102, 241, 0.05), rgba(139, 92, 246, 0.05));
    border-bottom: 1px solid var(--color-border-light);
}

.chat-avatar {
    width: 40px;
    height: 40px;
    border-radius: var(--radius-md);
    overflow: hidden;
}

.chat-avatar svg {
    width: 100%;
    height: 100%;
}

.chat-info {
    flex: 1;
}

.chat-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.chat-status {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.8125rem;
    color: var(--color-text-tertiary);
}

.status-dot {
    width: 8px;
    height: 8px;
    background: var(--color-success);
    border-radius: 50%;
}

.chat-messages {
    padding: var(--space-md);
    display: flex;
    flex-direction: column;
    gap: var(--space-sm);
    min-height: 320px;
    max-height: 420px;
    overflow-y: auto;
}

.message {
    max-width: 85%;
}

.user-message {
    align-self: flex-end;
}

.ai-message {
    align-self: flex-start;
}

.message-content {
    padding: 0.75rem 1rem;
    font-size: 0.875rem;
    line-height: 1.6;
}

.user-message .message-content {
    background: var(--gradient-primary);
    color: white;
    border-radius: var(--radius-md) var(--radius-md) 4px var(--radius-md);
}

.ai-message .message-content {
    background: #F8F8FA;
    color: var(--color-text-primary);
    border-radius: 4px var(--radius-md) var(--radius-md) var(--radius-md);
}

.progress-bar {
    height: 6px;
    background: var(--color-border);
    border-radius: var(--radius-full);
    margin: 0.75rem 0;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: var(--radius-full);
    animation: progressGrow 1.5s ease-out;
}

@keyframes progressGrow {
    from { width: 0; }
}

.sub-text {
    font-size: 0.8125rem;
    color: var(--color-success);
    margin-top: 0.5rem;
}

.task-list {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
    margin-top: 0.75rem;
}

.task-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.8125rem;
}

.task-check {
    width: 18px;
    height: 18px;
    background: var(--color-success);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.625rem;
}

.task-number {
    width: 18px;
    height: 18px;
    background: var(--color-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.625rem;
    font-weight: 600;
}

.task-item:not(.completed):not(.active) .task-number {
    background: var(--color-border);
    color: var(--color-text-light);
}

.task-item.active {
    color: var(--color-primary);
    font-weight: 500;
}

.chat-input {
    display: flex;
    gap: var(--space-xs);
    padding: var(--space-sm) var(--space-md);
    border-top: 1px solid var(--color-border-light);
    background: white;
}

.chat-input input {
    flex: 1;
    padding: 0.625rem 1rem;
    border: 1px solid var(--color-border-light);
    border-radius: var(--radius-full);
    font-size: 0.875rem;
    outline: none;
    background: white;
    transition: all var(--transition-fast);
}

.chat-input input:focus {
    border-color: var(--color-primary-light);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.send-btn {
    width: 36px;
    height: 36px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* ========================================
   信任标志
   ======================================== */
.trust-section {
    padding: var(--space-xl) 0;
    background: var(--color-bg-white);
    border-top: 1px solid var(--color-border-light);
    border-bottom: 1px solid var(--color-border-light);
}

.trust-title {
    text-align: center;
    font-size: 1rem;
    color: var(--color-text-secondary);
    margin-bottom: var(--space-lg);
}

.trust-title strong {
    color: var(--color-text-primary);
}

.trust-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: var(--space-xl);
    flex-wrap: wrap;
}

.trust-logo {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-tertiary);
    padding: 0.5rem 1rem;
    background: white;
    border-radius: var(--radius-sm);
    border: 1px solid var(--color-border-light);
}

/* ========================================
   通用区块样式
   ======================================== */
.section-header {
    text-align: center;
    max-width: 640px;
    margin: 0 auto var(--space-2xl);
    padding: 0 var(--space-md);
}

.section-tag {
    display: inline-block;
    padding: 0.375rem 0.875rem;
    background: rgba(99, 102, 241, 0.06);
    border: 1px solid rgba(99, 102, 241, 0.12);
    color: var(--color-primary);
    font-size: 0.8125rem;
    font-weight: 600;
    border-radius: var(--radius-full);
    margin-bottom: var(--space-sm);
}

.section-title {
    font-size: 2.25rem;
    font-weight: 700;
    color: var(--color-text-primary);
    margin-bottom: var(--space-sm);
    letter-spacing: -0.01em;
    line-height: 1.2;
}

.section-desc {
    font-size: 1.0625rem;
    color: var(--color-text-secondary);
    line-height: 1.6;
}

/* ========================================
   核心功能
   ======================================== */
.features {
    padding: var(--space-3xl) 0;
    position: relative;
}

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

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

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

.feature-card.large {
    grid-column: span 2;
    grid-row: span 2;
}

.feature-icon {
    width: 56px;
    height: 56px;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: var(--space-md);
}

.feature-icon svg {
    color: white;
}

.feature-icon.purple {
    background: var(--gradient-primary);
}

.feature-icon.blue {
    background: var(--gradient-secondary);
}

.feature-icon.green {
    background: linear-gradient(135deg, #10B981 0%, #34D399 100%);
}

.feature-icon.orange {
    background: var(--gradient-accent);
}

.feature-icon.pink {
    background: linear-gradient(135deg, #EC4899 0%, #F472B6 100%);
}

.feature-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.feature-desc {
    font-size: 0.9375rem;
    color: var(--color-text-tertiary);
    line-height: 1.6;
}

.feature-example {
    margin-top: var(--space-md);
    padding-top: var(--space-md);
    border-top: 1px solid var(--color-border-light);
    display: flex;
    flex-direction: column;
    gap: var(--space-xs);
}

.example-item {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--color-text-secondary);
    padding: 0.5rem 0.75rem;
    background: #F8F8FA;
    border-radius: var(--radius-sm);
}

.example-icon {
    font-size: 1rem;
}

/* ========================================
   工作流程
   ======================================== */
.workflow {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-white);
    position: relative;
}

.workflow::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border-light), transparent);
}

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

.step-card {
    flex: 1;
    max-width: 360px;
    background: white;
    border-radius: var(--radius-lg);
    padding: var(--space-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    position: relative;
    transition: all var(--transition-base);
}

.step-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-border);
}

.step-number {
    position: absolute;
    top: -12px;
    left: var(--space-lg);
    font-size: 0.75rem;
    font-weight: 700;
    color: white;
    background: var(--gradient-primary);
    padding: 0.25rem 0.75rem;
    border-radius: var(--radius-full);
}

.step-icon {
    color: var(--color-primary);
    margin-bottom: var(--space-md);
}

.step-title {
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.step-desc {
    font-size: 0.9375rem;
    color: var(--color-text-tertiary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
}

.step-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.step-tag {
    font-size: 0.75rem;
    color: var(--color-primary);
    background: rgba(99, 102, 241, 0.06);
    padding: 0.25rem 0.625rem;
    border-radius: var(--radius-full);
    font-weight: 500;
}

.step-arrow {
    color: var(--color-primary);
    flex-shrink: 0;
}

/* ========================================
   应用场景
   ======================================== */
.scenarios {
    padding: var(--space-3xl) 0;
    position: relative;
}

.scenarios::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border-light), transparent);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: var(--space-md);
}

.scenario-card {
    padding: var(--space-lg);
    background: white;
    border-radius: var(--radius-lg);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
}

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

.scenario-image {
    margin-bottom: var(--space-md);
}

.scenario-icon-bg {
    width: 80px;
    height: 80px;
    border-radius: var(--radius-lg);
    display: flex;
    align-items: center;
    justify-content: center;
}

.scenario-icon-bg svg {
    color: white;
}

.scenario-icon-bg.blue {
    background: var(--gradient-secondary);
}

.scenario-icon-bg.purple {
    background: var(--gradient-primary);
}

.scenario-icon-bg.green {
    background: linear-gradient(135deg, #10B981 0%, #34D399 100%);
}

.scenario-icon-bg.orange {
    background: var(--gradient-accent);
}

.scenario-title {
    font-size: 1.0625rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--color-text-primary);
}

.scenario-desc {
    font-size: 0.9375rem;
    color: var(--color-text-tertiary);
    line-height: 1.6;
}

/* ========================================
   客户评价
   ======================================== */
.testimonials {
    padding: var(--space-3xl) 0;
    background: var(--color-bg-white);
    position: relative;
}

.testimonials::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 80%;
    height: 1px;
    background: linear-gradient(90deg, transparent, var(--color-border-light), transparent);
}

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

.testimonial-card {
    padding: var(--space-lg);
    background: white;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-base);
}

.testimonial-card:hover {
    box-shadow: var(--shadow-md);
    border-color: var(--color-border);
}

.testimonial-rating {
    color: var(--color-warning);
    font-size: 1.25rem;
    letter-spacing: 2px;
    margin-bottom: var(--space-sm);
}

.testimonial-text {
    font-size: 0.9375rem;
    color: var(--color-text-secondary);
    line-height: 1.7;
    margin-bottom: var(--space-lg);
}

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

.author-avatar {
    width: 44px;
    height: 44px;
    background: var(--gradient-primary);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 600;
    font-size: 1rem;
}

.author-name {
    font-weight: 600;
    font-size: 0.9375rem;
}

.author-title {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
}

/* ========================================
   CTA 区域
   ======================================== */
.cta-section {
    padding: var(--space-3xl) 0;
}

.cta-card {
    position: relative;
    background: var(--gradient-primary);
    border-radius: var(--radius-xl);
    padding: var(--space-3xl);
    overflow: hidden;
    box-shadow: var(--shadow-lg);
}

.cta-bg {
    position: absolute;
    inset: 0;
    pointer-events: none;
}

.cta-orb-1 {
    width: 400px;
    height: 400px;
    background: rgba(255, 255, 255, 0.15);
    top: -100px;
    right: -100px;
    opacity: 0.6;
}

.cta-orb-2 {
    width: 300px;
    height: 300px;
    background: rgba(255, 255, 255, 0.15);
    bottom: -50px;
    left: -50px;
    opacity: 0.4;
}

.cta-content {
    position: relative;
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.cta-title {
    font-size: 2rem;
    font-weight: 700;
    color: white;
    margin-bottom: var(--space-sm);
    letter-spacing: -0.01em;
}

.cta-desc {
    font-size: 1.0625rem;
    color: rgba(255, 255, 255, 0.85);
    margin-bottom: var(--space-xl);
}

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

.cta-note {
    font-size: 0.875rem;
    color: rgba(255, 255, 255, 0.7);
}

/* ========================================
   底部
   ======================================== */
.footer {
    padding: var(--space-3xl) 0 var(--space-xl);
    background: var(--color-bg-white);
    border-top: 1px solid var(--color-border-light);
}

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

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

.footer-logo .logo-icon {
    width: 32px;
    height: 32px;
}

.footer-logo span {
    font-size: 1.125rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-desc {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    line-height: 1.6;
    margin-bottom: var(--space-md);
    max-width: 260px;
}

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

.social-link {
    width: 40px;
    height: 40px;
    background: white;
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-text-secondary);
    border: 1px solid var(--color-border-light);
    transition: all var(--transition-fast);
}

.social-link:hover {
    background: var(--color-primary);
    color: white;
    border-color: var(--color-primary);
    transform: translateY(-2px);
}

.footer-links h4 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: var(--space-md);
}

.footer-links ul {
    display: flex;
    flex-direction: column;
    gap: 0.625rem;
}

.footer-links a {
    font-size: 0.875rem;
    color: var(--color-text-tertiary);
    transition: all var(--transition-fast);
}

.footer-links a:hover {
    color: var(--color-primary);
    transform: translateX(2px);
}

.footer-bottom {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--space-xl);
    border-top: 1px solid var(--color-border);
}

.footer-bottom p {
    font-size: 0.8125rem;
    color: var(--color-text-light);
}

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

.footer-legal a {
    font-size: 0.8125rem;
    color: var(--color-text-light);
    transition: color var(--transition-fast);
}

.footer-legal a:hover {
    color: var(--color-primary);
}

/* ========================================
   响应式设计
   ======================================== */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 2.5rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .feature-card.large {
        grid-column: span 2;
    }
    
    .scenarios-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .workflow-steps {
        flex-direction: column;
    }
    
    .step-arrow {
        transform: rotate(90deg);
    }
    
    .footer-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .section-title {
        font-size: 1.875rem;
    }
}

@media (max-width: 768px) {
    :root {
        --space-3xl: 3.5rem;
        --space-2xl: 2.5rem;
        --space-xl: 2rem;
    }
    
    .nav-menu,
    .nav-actions {
        display: none;
    }
    
    .mobile-toggle {
        display: flex;
    }
    
    .hero > .container {
        grid-template-columns: 1fr;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-desc {
        font-size: 1rem;
    }
    
    .hero-actions {
        flex-direction: column;
    }
    
    .hero-stats {
        justify-content: flex-start;
        gap: var(--space-md);
    }
    
    .stat-number {
        font-size: 1.5rem;
    }
    
    .hero-visual {
        order: -1;
    }
    
    .chat-demo {
        margin: 0 auto;
        max-width: 100%;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .feature-card.large {
        grid-column: span 1;
    }
    
    .scenarios-grid {
        grid-template-columns: 1fr;
    }
    
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
    
    .section-title {
        font-size: 1.625rem;
    }
    
    .cta-title {
        font-size: 1.5rem;
    }
    
    .cta-actions {
        flex-direction: column;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        gap: var(--space-xl);
    }
    
    .footer-bottom {
        flex-direction: column;
        gap: var(--space-sm);
        text-align: center;
    }
}

/* ========================================
   动画效果
   ======================================== */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero-content > * {
    animation: fadeInUp 0.6s ease forwards;
}

.hero-content > *:nth-child(1) { animation-delay: 0.1s; }
.hero-content > *:nth-child(2) { animation-delay: 0.2s; }
.hero-content > *:nth-child(3) { animation-delay: 0.3s; }
.hero-content > *:nth-child(4) { animation-delay: 0.4s; }
.hero-content > *:nth-child(5) { animation-delay: 0.5s; }

/* 滚动显示动画 */
.scroll-reveal {
    opacity: 0;
    transform: translateY(20px);
    transition: all 0.6s ease;
}

.scroll-reveal.revealed {
    opacity: 1;
    transform: translateY(0);
}