/* ==========================================
   小龙哈AI官网样式表
   现代化、科技感设计
   ========================================== */

/* 导入AOS动画库 */
@import url('https://cdnjs.cloudflare.com/ajax/libs/aos/2.3.4/aos.css');

/* ==========================================
   全局样式
   ========================================== */
:root {
    /* 主色调 - 科技蓝紫渐变 */
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #818cf8;
    --secondary-color: #8b5cf6;
    --accent-color: #06b6d4;
    
    /* 中性色 */
    --dark: #0f172a;
    --dark-light: #1e293b;
    --gray: #64748b;
    --gray-light: #cbd5e1;
    --light: #f1f5f9;
    --white: #ffffff;
    
    /* 渐变色 */
    --gradient-primary: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --gradient-secondary: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --gradient-accent: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
    
    /* 字体 */
    --font-primary: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    --font-heading: 'PingFang SC', 'Microsoft YaHei', 'Helvetica Neue', Arial, sans-serif;
    
    /* 间距 */
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 4rem;
    --spacing-xl: 6rem;
    
    /* 圆角 */
    --radius-sm: 0.5rem;
    --radius-md: 1rem;
    --radius-lg: 1.5rem;
    --radius-xl: 2rem;
    
    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 32px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 16px 48px rgba(0, 0, 0, 0.2);
    
    /* 过渡 */
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

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

body {
    font-family: var(--font-primary);
    color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
    background: var(--white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* ==========================================
   导航栏
   ========================================== */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: 0 2px 20px rgba(0, 0, 0, 0.05);
    transition: var(--transition);
}

.navbar.scrolled {
    background: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 30px rgba(0, 0, 0, 0.1);
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
}

.nav-brand {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-logo-img {
    width: 32px;
    height: 32px;
    object-fit: contain;
    display: block;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
}

.nav-link {
    color: var(--dark);
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: var(--transition);
    padding: 0.5rem 0;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--gradient-primary);
    transition: var(--transition);
}

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

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

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 0.25rem;
    cursor: pointer;
}

.nav-toggle span {
    width: 25px;
    height: 3px;
    background: var(--dark);
    border-radius: 2px;
    transition: var(--transition);
}

/* ==========================================
   英雄区
   ========================================== */
.hero {
    position: relative;
    min-height: 100vh;
    display: flex;
    align-items: center;
    padding: 8rem 0 4rem;
    overflow: hidden;
}

.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    opacity: 0.05;
}

.grid-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-image: 
        linear-gradient(rgba(99, 102, 241, 0.1) 1px, transparent 1px),
        linear-gradient(90deg, rgba(99, 102, 241, 0.1) 1px, transparent 1px);
    background-size: 50px 50px;
}

.particles {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}

.hero .container {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-content {
    animation: fadeInUp 1s ease-out;
}

.hero-badge {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1.25rem;
    background: rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 2rem;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--dark);
}

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

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--gray);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    margin-bottom: 3rem;
}

.hero-stats {
    display: flex;
    gap: 3rem;
}

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

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.875rem;
    color: var(--gray);
}

.hero-image {
    position: relative;
    animation: fadeInRight 1s ease-out;
}

.mockup-container {
    position: relative;
    animation: float 6s ease-in-out infinite;
}

.mockup-glow {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 120%;
    height: 120%;
    background: radial-gradient(circle, rgba(99, 102, 241, 0.3) 0%, transparent 70%);
    filter: blur(40px);
    animation: pulse 4s ease-in-out infinite;
}

.mockup-img {
    position: relative;
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 60px rgba(99, 102, 241, 0.3));
}

/* ==========================================
   英雄区 SVG 动画（监控 & 自动回复演示）
   ========================================== */
.monitor-demo {
    display: block;
    width: 100%;
    height: auto;
}

.monitor-demo text {
    font-family: var(--font-primary);
    letter-spacing: 0.2px;
}

.monitor-demo .md-title {
    font-size: 20px;
    font-weight: 700;
    fill: rgba(15, 23, 42, 0.72);
}

.monitor-demo .md-subtitle {
    font-size: 18px;
    font-weight: 700;
    fill: rgba(15, 23, 42, 0.62);
}

.monitor-demo .md-status-text {
    font-size: 14px;
    font-weight: 600;
    fill: rgba(15, 23, 42, 0.55);
}

.monitor-demo .md-msg {
    font-size: 16px;
    font-weight: 600;
    fill: rgba(15, 23, 42, 0.70);
}

.monitor-demo .md-msg-muted {
    font-size: 14px;
    font-weight: 600;
    fill: rgba(15, 23, 42, 0.45);
}

.monitor-demo .md-footnote {
    font-size: 12px;
    font-weight: 600;
    fill: rgba(15, 23, 42, 0.42);
}

.monitor-demo .md-notif {
    fill: #ef4444;
    opacity: 0;
    transform-origin: center;
    animation: mdNotif 10s linear infinite;
}

.monitor-demo .md-scan-line {
    fill: url(#mdGrad2);
    opacity: 0.0;
    animation: mdScanLine 10s linear infinite;
}

.monitor-demo .md-scan-glow {
    fill: rgba(6, 182, 212, 0.0);
    animation: mdScanGlow 10s linear infinite;
}

.monitor-demo .md-user {
    opacity: 0;
    transform: translateY(10px);
    animation: mdUserIn 10s linear infinite;
}

.monitor-demo .md-analyze {
    opacity: 0;
    transform: translateY(8px);
    animation: mdAnalyzeIn 10s linear infinite;
}

.monitor-demo .md-card-title {
    font-size: 16px;
    font-weight: 800;
    fill: rgba(79, 70, 229, 0.85);
}

.monitor-demo .md-bar {
    fill: rgba(99, 102, 241, 0.25);
    transform-origin: left center;
}

.monitor-demo .md-bar-1 {
    animation: mdBarGrow1 10s linear infinite;
}

.monitor-demo .md-bar-2 {
    animation: mdBarGrow2 10s linear infinite;
}

.monitor-demo .md-typing circle {
    fill: rgba(79, 70, 229, 0.75);
    opacity: 0.2;
    animation: mdTyping 1.2s ease-in-out infinite;
}

.monitor-demo .md-typing circle:nth-child(2) {
    animation-delay: 0.15s;
}

.monitor-demo .md-typing circle:nth-child(3) {
    animation-delay: 0.3s;
}

.monitor-demo .md-ai {
    opacity: 0;
    transform: translateY(8px);
    animation: mdAiIn 10s linear infinite;
}

.monitor-demo .md-send path {
    fill: rgba(99, 102, 241, 0.9);
    opacity: 0;
    transform-origin: center;
    animation: mdSend 10s linear infinite;
}

.monitor-demo .md-progress {
    opacity: 0.9;
    transform-origin: left center;
    transform: scaleX(0);
    animation: mdProgress 10s linear infinite;
}

@keyframes mdNotif {
    0%, 10% { opacity: 0; transform: scale(0.8); }
    12% { opacity: 1; transform: scale(1.1); }
    18% { opacity: 1; transform: scale(1.0); }
    22% { opacity: 0; transform: scale(1.2); }
    100% { opacity: 0; transform: scale(0.8); }
}

@keyframes mdScanLine {
    0% { opacity: 0; transform: translateY(0); }
    6% { opacity: 0.0; transform: translateY(0); }
    12% { opacity: 0.65; transform: translateY(0); }
    38% { opacity: 0.55; transform: translateY(330px); }
    45% { opacity: 0.0; transform: translateY(380px); }
    100% { opacity: 0; transform: translateY(380px); }
}

@keyframes mdScanGlow {
    0%, 8% { fill: rgba(6, 182, 212, 0.0); }
    16% { fill: rgba(6, 182, 212, 0.06); }
    32% { fill: rgba(6, 182, 212, 0.05); }
    46% { fill: rgba(6, 182, 212, 0.0); }
    100% { fill: rgba(6, 182, 212, 0.0); }
}

@keyframes mdUserIn {
    0%, 14% { opacity: 0; transform: translateY(10px); }
    18% { opacity: 1; transform: translateY(0); }
    86% { opacity: 1; transform: translateY(0); }
    100% { opacity: 0; transform: translateY(6px); }
}

@keyframes mdAnalyzeIn {
    0%, 28% { opacity: 0; transform: translateY(8px); }
    34% { opacity: 1; transform: translateY(0); }
    56% { opacity: 1; transform: translateY(0); }
    64% { opacity: 0; transform: translateY(6px); }
    100% { opacity: 0; transform: translateY(6px); }
}

@keyframes mdBarGrow1 {
    0%, 30% { transform: scaleX(0.05); opacity: 0; }
    36% { transform: scaleX(0.65); opacity: 1; }
    52% { transform: scaleX(1.0); opacity: 1; }
    62% { transform: scaleX(1.0); opacity: 0; }
    100% { transform: scaleX(0.05); opacity: 0; }
}

@keyframes mdBarGrow2 {
    0%, 32% { transform: scaleX(0.05); opacity: 0; }
    40% { transform: scaleX(0.55); opacity: 1; }
    54% { transform: scaleX(0.92); opacity: 1; }
    62% { transform: scaleX(0.92); opacity: 0; }
    100% { transform: scaleX(0.05); opacity: 0; }
}

@keyframes mdTyping {
    0%, 100% { opacity: 0.25; transform: translateY(0); }
    50% { opacity: 0.9; transform: translateY(-2px); }
}

@keyframes mdAiIn {
    0%, 54% { opacity: 0; transform: translateY(8px); }
    62% { opacity: 1; transform: translateY(0); }
    88% { opacity: 1; transform: translateY(0); }
    96% { opacity: 0; transform: translateY(6px); }
    100% { opacity: 0; transform: translateY(6px); }
}

@keyframes mdSend {
    0%, 68% { opacity: 0; transform: translateX(0) scale(1); }
    72% { opacity: 1; transform: translateX(0) scale(1); }
    78% { opacity: 1; transform: translateX(12px) scale(0.98); }
    84% { opacity: 0; transform: translateX(20px) scale(0.95); }
    100% { opacity: 0; transform: translateX(0) scale(1); }
}

@keyframes mdProgress {
    0% { transform: scaleX(0); opacity: 0.85; }
    12% { transform: scaleX(0.10); opacity: 0.9; }
    70% { transform: scaleX(0.78); opacity: 0.9; }
    92% { transform: scaleX(1.0); opacity: 0.85; }
    100% { transform: scaleX(0); opacity: 0.0; }
}

@media (prefers-reduced-motion: reduce) {
    .monitor-demo .md-notif,
    .monitor-demo .md-scan-line,
    .monitor-demo .md-scan-glow,
    .monitor-demo .md-user,
    .monitor-demo .md-analyze,
    .monitor-demo .md-bar-1,
    .monitor-demo .md-bar-2,
    .monitor-demo .md-ai,
    .monitor-demo .md-send path,
    .monitor-demo .md-progress,
    .monitor-demo .md-typing circle {
        animation: none !important;
    }

    .monitor-demo .md-user,
    .monitor-demo .md-analyze,
    .monitor-demo .md-ai {
        opacity: 1;
        transform: none;
    }
}

/* ==========================================
   按钮样式
   ========================================== */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.btn::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.6s, height 0.6s;
}

.btn:hover::before {
    width: 300px;
    height: 300px;
}

.btn-primary {
    background: var(--gradient-primary);
    color: var(--white);
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 30px rgba(99, 102, 241, 0.5);
}

.btn-secondary {
    background: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

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

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

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

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.125rem;
}

/* ==========================================
   区块标题
   ========================================== */
.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: rgba(99, 102, 241, 0.1);
    border-radius: 50px;
    color: var(--primary-color);
    font-size: 0.875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 1rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    color: var(--dark);
}

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

/* ==========================================
   功能区
   ========================================== */
.features {
    padding: 6rem 0;
    background: var(--light);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.feature-card {
    background: var(--white);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transition: var(--transition);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.feature-card:hover::before {
    transform: scaleX(1);
}

.feature-icon {
    width: 70px;
    height: 70px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: var(--radius-md);
    margin-bottom: 1.5rem;
    font-size: 2rem;
    color: var(--white);
}

.feature-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--dark);
}

.feature-card p {
    color: var(--gray);
    margin-bottom: 1.5rem;
    line-height: 1.8;
}

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

.feature-list li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    color: var(--gray);
    margin-bottom: 0.75rem;
    font-size: 0.9rem;
}

.feature-list i {
    color: var(--primary-color);
    font-size: 0.875rem;
}

/* ==========================================
   工作流程
   ========================================== */
.workflow {
    padding: 6rem 0;
    background: var(--white);
}

.workflow-steps {
    display: flex;
    flex-direction: column;
    gap: 2rem;
    max-width: 900px;
    margin: 0 auto;
}

.workflow-step {
    display: grid;
    grid-template-columns: auto 1fr auto;
    gap: 2rem;
    align-items: center;
    padding: 2.5rem;
    background: var(--light);
    border-radius: var(--radius-lg);
    position: relative;
    transition: var(--transition);
}

.workflow-step:hover {
    transform: translateX(10px);
    box-shadow: var(--shadow-md);
}

.step-number {
    font-size: 3rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.step-content h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    color: var(--dark);
}

.step-content p {
    color: var(--gray);
    line-height: 1.8;
}

.step-icon {
    width: 80px;
    height: 80px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    font-size: 2rem;
    color: var(--white);
}

/* ==========================================
   应用场景
   ========================================== */
.scenarios {
    padding: 6rem 0;
    background: var(--white);
}

.scenarios-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
}

.scenario-card {
    background: var(--light);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
}

.scenario-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition);
}

.scenario-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.scenario-card:hover::before {
    opacity: 0.05;
}

.scenario-icon {
    width: 100px;
    height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: var(--gradient-primary);
    border-radius: 50%;
    margin: 0 auto 1.5rem;
    font-size: 3rem;
    color: var(--white);
    position: relative;
    z-index: 1;
}

.scenario-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--dark);
    position: relative;
    z-index: 1;
}

.scenario-card p {
    color: var(--gray);
    margin-bottom: 1.5rem;
    line-height: 1.8;
    position: relative;
    z-index: 1;
}

.scenario-benefits {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
    position: relative;
    z-index: 1;
}

.scenario-benefits span {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--gray);
}

.scenario-benefits i {
    color: var(--primary-color);
}

/* ==========================================
   套餐价格
   ========================================== */
.pricing {
    padding: 6rem 0;
    background: var(--light);
}

.pricing-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.pricing-card {
    background: var(--white);
    padding: 3rem 2.5rem;
    border-radius: var(--radius-lg);
    text-align: center;
    position: relative;
    transition: var(--transition);
    border: 2px solid transparent;
}

.pricing-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.pricing-card.featured {
    border-color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.pricing-badge {
    position: absolute;
    top: -15px;
    left: 50%;
    transform: translateX(-50%);
    padding: 0.5rem 1.5rem;
    background: var(--gradient-primary);
    color: var(--white);
    border-radius: 50px;
    font-size: 0.875rem;
    font-weight: 600;
}

.pricing-badge.popular {
    background: var(--gradient-accent);
}

.pricing-card h3 {
    font-size: 1.75rem;
    font-weight: 700;
    margin: 1.5rem 0 1rem;
    color: var(--dark);
}

.pricing-price {
    margin-bottom: 2rem;
}

.price-currency {
    font-size: 1.5rem;
    color: var(--gray);
    vertical-align: top;
}

.price-amount {
    font-size: 4rem;
    font-weight: 800;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.price-period {
    font-size: 1rem;
    color: var(--gray);
}

.pricing-features {
    list-style: none;
    margin-bottom: 2rem;
    text-align: left;
}

.pricing-features li {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    padding: 0.75rem 0;
    color: var(--gray);
    border-bottom: 1px solid var(--gray-light);
}

.pricing-features li:last-child {
    border-bottom: none;
}

.pricing-features i.fa-check {
    color: var(--primary-color);
}

.pricing-features i.fa-times {
    color: var(--gray-light);
}

.pricing-note {
    text-align: center;
    color: var(--gray);
    font-size: 0.875rem;
}

.pricing-note i {
    color: var(--primary-color);
    margin-right: 0.5rem;
}

/* ==========================================
   下载区域
   ========================================== */
.download {
    padding: 6rem 0;
    background: var(--dark);
    color: var(--white);
    position: relative;
    overflow: hidden;
}

.download::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: var(--gradient-primary);
    opacity: 0.1;
}

.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
    position: relative;
    z-index: 1;
}

.download-text h2 {
    font-size: 2.5rem;
    font-weight: 800;
    margin-bottom: 1rem;
    line-height: 1.3;
}

.download-text p {
    font-size: 1.125rem;
    color: var(--gray-light);
    margin-bottom: 2rem;
}

.download-features {
    list-style: none;
    margin-bottom: 2.5rem;
}

.download-features li {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 1rem;
    font-size: 1.125rem;
}

.download-features i {
    color: var(--accent-color);
    font-size: 1.25rem;
}
 

/* 下载区域内注册表单 */
.register-card {
    margin-bottom: 2rem;
    padding: 1.75rem 1.75rem 1.5rem;
    border-radius: var(--radius-lg);
    background: rgba(15, 23, 42, 0.55);
    box-shadow: 0 12px 40px rgba(15, 23, 42, 0.45);
    border: 1px solid rgba(148, 163, 184, 0.35);
    backdrop-filter: blur(12px);
}

.register-card h3 {
    font-size: 1.4rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
}

.register-tip {
    font-size: 0.95rem;
    color: var(--gray-light);
    margin-bottom: 1.25rem;
}

.register-form {
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
}

.form-row {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.form-row-footer {
    margin-top: 0.25rem;
}

.form-row label {
    font-size: 0.9rem;
    color: rgba(226, 232, 240, 0.9);
}

.form-field {
    position: relative;
}

.form-field input {
    width: 100%;
    padding: 0.7rem 0.9rem;
    border-radius: 0.75rem;
    border: 1px solid rgba(148, 163, 184, 0.5);
    background: rgba(15, 23, 42, 0.7);
    color: #e5e7eb;
    font-size: 0.95rem;
    outline: none;
    transition: var(--transition);
}

.form-field input::placeholder {
    color: rgba(148, 163, 184, 0.9);
}

.form-field input:focus {
    border-color: rgba(129, 140, 248, 0.95);
    box-shadow: 0 0 0 1px rgba(129, 140, 248, 0.7);
    background: rgba(15, 23, 42, 0.92);
}

.form-field-code {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.form-field-code input {
    flex: 1;
}

.btn-code {
    white-space: nowrap;
    padding: 0.65rem 0.95rem;
    border-radius: 999px;
    border: none;
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    color: #0f172a;
    font-size: 0.85rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition);
}

.btn-code:hover:not(:disabled) {
    transform: translateY(-1px);
    box-shadow: 0 8px 24px rgba(56, 189, 248, 0.45);
}

.btn-code:disabled {
    cursor: not-allowed;
    opacity: 0.6;
    box-shadow: none;
}

.register-desc {
    font-size: 0.8rem;
    color: rgba(148, 163, 184, 0.95);
}

.register-submit {
    width: 100%;
    justify-content: center;
}

.register-status {
    margin-top: 0.5rem;
    font-size: 0.85rem;
    min-height: 1.1em;
    color: rgba(248, 250, 252, 0.9);
}

.register-status.error {
    color: #fecaca;
}

.register-status.success {
    color: #bbf7d0;
}

.download-mockup {
    position: relative;
    animation: float 6s ease-in-out infinite;
}

.download-mockup img {
    width: 100%;
    height: auto;
    filter: drop-shadow(0 20px 60px rgba(99, 102, 241, 0.5));
}

.download-hero-svg {
    width: 100%;
    height: auto;
    display: block;
}

.download-hero-svg text {
    font-family: var(--font-primary);
}

.download-hero-svg .dl-tag-text {
    fill: #e5e7eb;
    font-size: 12px;
}

.download-hero-svg .dl-caption-main {
    fill: #e5e7eb;
    font-size: 14px;
    text-anchor: middle;
}

.download-hero-svg .dl-caption-sub {
    fill: #9ca3af;
    font-size: 11px;
    text-anchor: middle;
}

.download-hero-svg .dl-tag {
    opacity: 0.35;
    transform-origin: center;
    animation: dlTagCycle 12s infinite ease-in-out;
}

.download-hero-svg .dl-tag-2 {
    animation-delay: 3s;
}

.download-hero-svg .dl-tag-3 {
    animation-delay: 6s;
}

.download-hero-svg .dl-tag-4 {
    animation-delay: 9s;
}

@keyframes dlTagCycle {
    0% { opacity: 0.18; transform: translateY(6px); }
    8% { opacity: 1; transform: translateY(0); }
    22% { opacity: 1; transform: translateY(0); }
    30% { opacity: 0.18; transform: translateY(-4px); }
    100% { opacity: 0.18; transform: translateY(6px); }
}

@media (prefers-reduced-motion: reduce) {
    .download-hero-svg .dl-tag {
        animation: none !important;
        opacity: 0.9;
        transform: none;
    }
}

/* ==========================================
   页脚
   ========================================== */
.footer {
    background: var(--dark-light);
    color: var(--gray-light);
    padding: 4rem 0 2rem;
}

.footer-content {
    display: grid;
    grid-template-columns: 2fr 1fr 1fr 1fr;
    gap: 3rem;
    margin-bottom: 3rem;
}

.footer-brand {
    max-width: 300px;
}

.footer-logo {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--white);
    margin-bottom: 1rem;
}

.footer-logo i {
    font-size: 2rem;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.footer-brand p {
    margin-bottom: 1.5rem;
    line-height: 1.8;
}
.footer-links {
    display: flex;
    justify-content: space-around;
    gap: 1rem;
}
.footer-social {
    display: flex;
    gap: 1rem;
}

.footer-social a {
    width: 40px;
    height: 40px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: var(--white);
    transition: var(--transition);
}

.footer-social a:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}
.footer-column{
    min-width: fit-content;
}

.footer-column h4 {
    color: var(--white);
    font-size: 1.125rem;
    font-weight: 600;
    margin-bottom: 1.5rem;
}

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

.footer-column ul li {
    margin-bottom: 0.75rem;
}

.footer-column ul li a {
    color: var(--gray-light);
    text-decoration: none;
    transition: var(--transition);
}

.footer-column ul li a:hover {
    color: var(--white);
    padding-left: 0.5rem;
}

.footer-bottom {
    text-align: center;
    padding-top: 2rem;
    flex: 1;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

/* ==========================================
   返回顶部按钮
   ========================================== */
.back-to-top {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    color: var(--white);
    border: none;
    border-radius: 50%;
    font-size: 1.25rem;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
    box-shadow: var(--shadow-lg);
}

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

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}

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

@keyframes fadeInRight {
    from {
        opacity: 0;
        transform: translateX(30px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes float {
    0%, 100% {
        transform: translateY(0);
    }
    50% {
        transform: translateY(-20px);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.3;
    }
    50% {
        opacity: 0.6;
    }
}

/* ==========================================
   响应式设计
   ========================================== */
@media (max-width: 1024px) {
    .hero .container {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .hero-image {
        order: -1;
    }
    
    .features-grid,
    .scenarios-grid,
    .pricing-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .download-content {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 768px) {
    html {
        font-size: 14px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        padding: 2rem;
        gap: 1rem;
        transition: var(--transition);
        box-shadow: var(--shadow-lg);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-buttons {
        flex-direction: column;
    }
    
    .hero-stats {
        gap: 2rem;
    }
    
    .features-grid,
    .scenarios-grid,
    .pricing-grid {
        grid-template-columns: 1fr;
    }
    
    .workflow-step {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .step-number {
        font-size: 2rem;
    }
    
    .step-icon {
        margin: 0 auto;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 0 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 1.5rem;
    }
    
    .btn {
        width: 100%;
        justify-content: center;
    }
}