/* ==================== 
   基础样式与变量
   ==================== */
:root {
    /* 主色调 - 蓝色系 */
    --primary-color: #A9CEF1;
    --primary-light: #BBDEFB;
    --primary-lighter: #E3F2FD;
    --primary-dark: #7AB8E8;
    
    /* 背景色 */
    --bg-color: #FCFDFF;
    --bg-secondary: #F5F8FC;
    
    /* 边框与分割线 */
    --border-color: #D6DBE5;
    --border-light: #E8ECF2;
    
    /* 文字颜色 */
    --text-primary: #2D3748;
    --text-secondary: #4A5568;
    --text-light: #718096;
    --text-white: #FFFFFF;
    
    /* 阴影 */
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.04);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
    
    /* 圆角 */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 容器最大宽度 */
    --max-width: 1200px;
}

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

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

a {
    text-decoration: none;
    color: inherit;
    transition: color var(--transition-fast);
}

ul, ol {
    list-style: none;
}

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

/* ==================== 
   通用组件
   ==================== */
.section-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 5%;
}

.section-header {
    text-align: center;
    margin-bottom: 4rem;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 1rem;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    border-radius: 2px;
}

.section-desc {
    font-size: clamp(1rem, 2vw, 1.125rem);
    color: var(--text-light);
    max-width: 600px;
    margin: 0 auto;
}

/* 按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.875rem 2rem;
    font-size: 1rem;
    font-weight: 500;
    border-radius: var(--radius-md);
    border: none;
    cursor: pointer;
    transition: all var(--transition-normal);
    text-decoration: none;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
}

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

.btn-secondary:hover {
    border-color: var(--primary-color);
    color: var(--primary-dark);
    background: var(--primary-lighter);
}

.btn-full {
    width: 100%;
}

/* ==================== 
   导航栏
   ==================== */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(252, 253, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

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

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 5%;
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.25rem;
}

.logo-icon {
    font-size: 1.5rem;
    color: var(--primary-dark);
}

.logo-text {
    color: var(--text-primary);
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 2rem;
}

.nav-link {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    padding: 0.5rem 0;
    position: relative;
}

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

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

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

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

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-secondary);
    transition: all var(--transition-fast);
}

/* ==================== 
   主视觉区域
   ==================== */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 100px 5% 60px;
    background: linear-gradient(135deg, var(--bg-color) 0%, var(--primary-lighter) 100%);
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -30%;
    width: 80%;
    height: 150%;
    background: radial-gradient(circle, var(--primary-light) 0%, transparent 70%);
    opacity: 0.3;
    animation: float 20s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translate(0, 0) rotate(0deg); }
    50% { transform: translate(-5%, 5%) rotate(5deg); }
}

.hero-content {
    text-align: center;
    max-width: 800px;
    z-index: 1;
}

.hero-title {
    font-size: clamp(2rem, 6vw, 3.5rem);
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
}

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

.hero-subtitle {
    font-size: clamp(1rem, 2.5vw, 1.25rem);
    color: var(--text-secondary);
    margin-bottom: 2.5rem;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.hero-visual {
    display: flex;
    gap: 1.5rem;
    margin-top: 4rem;
    justify-content: center;
    flex-wrap: wrap;
}

.visual-card {
    background: var(--bg-color);
    padding: 1.5rem 2rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    text-align: center;
    transition: transform var(--transition-normal);
    border: 1px solid var(--border-light);
}

.visual-card:hover {
    transform: translateY(-5px);
}

.card-icon {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.card-text {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* ==================== 
   核心功能
   ==================== */
.features-section {
    padding: 6rem 0;
    background: var(--bg-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.feature-card {
    background: var(--bg-color);
    padding: 2.5rem 2rem;
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
    position: relative;
    overflow: hidden;
}

.feature-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 3px;
    background: linear-gradient(90deg, var(--primary-color), var(--primary-light));
    transform: scaleX(0);
    transition: transform var(--transition-normal);
}

.feature-card:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-5px);
    border-color: var(--primary-light);
}

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

.feature-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-lighter);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
}

.feature-icon svg {
    width: 28px;
    height: 28px;
    color: var(--primary-dark);
}

.feature-title {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 1rem;
}

.feature-desc {
    font-size: 0.9375rem;
    color: var(--text-light);
    line-height: 1.7;
}

/* ==================== 
   产品优势
   ==================== */
.advantages-section {
    padding: 6rem 0;
    background: linear-gradient(180deg, var(--primary-lighter) 0%, var(--bg-color) 100%);
}

.advantages-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 2rem;
}

.advantage-item {
    display: flex;
    align-items: flex-start;
    gap: 1.5rem;
    padding: 2rem;
    background: var(--bg-color);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
    transition: all var(--transition-normal);
}

.advantage-item:hover {
    box-shadow: var(--shadow-md);
}

.advantage-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--primary-color);
    line-height: 1;
    opacity: 0.8;
}

.advantage-info h3 {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 0.5rem;
}

.advantage-info p {
    font-size: 0.9375rem;
    color: var(--text-light);
    line-height: 1.6;
}

/* ==================== 
   关于我们
   ==================== */
.about-section {
    padding: 6rem 0;
    background: var(--bg-color);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: center;
}

.about-text .section-title {
    text-align: left;
}

.about-text .section-title::after {
    left: 0;
    transform: none;
}

.about-desc {
    font-size: 1rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 1.5rem;
}

.about-stats {
    display: flex;
    gap: 3rem;
    margin-top: 2.5rem;
    flex-wrap: wrap;
}

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

.stat-number {
    font-size: clamp(2rem, 4vw, 2.5rem);
    font-weight: 800;
    color: var(--primary-dark);
    line-height: 1;
    margin-bottom: 0.5rem;
}

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

.about-visual {
    display: flex;
    justify-content: center;
    align-items: center;
}

.visual-element {
    position: relative;
}

.circle-outer {
    width: clamp(200px, 30vw, 300px);
    height: clamp(200px, 30vw, 300px);
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-light), var(--primary-lighter));
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: var(--shadow-lg);
    animation: pulse 4s ease-in-out infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.02); }
}

.circle-inner {
    width: 70%;
    height: 70%;
    border-radius: 50%;
    background: var(--bg-color);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    font-size: clamp(1.25rem, 3vw, 1.5rem);
    color: var(--text-primary);
    box-shadow: inset var(--shadow-sm);
}

/* ==================== 
   联系我们
   ==================== */
.contact-section {
    padding: 6rem 0;
    background: linear-gradient(180deg, var(--bg-color) 0%, var(--primary-lighter) 100%);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 4rem;
    align-items: start;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--bg-color);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-sm);
    border: 1px solid var(--border-light);
}

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

.contact-detail h4 {
    font-size: 0.875rem;
    color: var(--text-light);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.contact-detail p {
    font-size: 0.9375rem;
    color: var(--text-primary);
    font-weight: 500;
    line-height: 1.5;
    word-break: break-word;
}

.contact-form-wrapper {
    background: var(--bg-color);
    padding: 2.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-light);
}

.contact-form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem 1.25rem;
    font-size: 1rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    background: var(--bg-secondary);
    color: var(--text-primary);
    transition: all var(--transition-fast);
    font-family: inherit;
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    background: var(--bg-color);
    box-shadow: 0 0 0 3px rgba(169, 206, 241, 0.2);
}

.form-group textarea {
    resize: vertical;
    min-height: 120px;
}

/* ==================== 
   页脚
   ==================== */
.footer {
    background: var(--bg-secondary);
    padding: 3rem 0 2rem;
    border-top: 1px solid var(--border-light);
}

.footer-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 5%;
    text-align: center;
}

.footer-main {
    margin-bottom: 1.5rem;
}

.footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    font-weight: 700;
    font-size: 1.125rem;
    margin-bottom: 0.5rem;
}

.footer-desc {
    color: var(--text-light);
    font-size: 0.875rem;
}

.footer-links {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

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

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

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

.footer-copyright p {
    margin-bottom: 0.5rem;
}

.footer-copyright p:last-child {
    margin-bottom: 0;
}

.footer-beian {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.footer-beian a {
    color: var(--text-secondary);
    transition: color var(--transition-fast);
}

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

.beian-divider {
    color: var(--border-color);
    margin: 0 0.25rem;
}

.footer-copyright a {
    color: var(--text-secondary);
}

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

/* ==================== 
   公众号二维码悬浮组件
   ==================== */
.qrcode-float {
    position: fixed;
    right: 0;
    top: 50%;
    transform: translateY(-50%);
    z-index: 999;
    display: flex;
    align-items: center;
}

.qrcode-trigger {
    background: linear-gradient(135deg, var(--primary-color), var(--primary-dark));
    color: var(--text-primary);
    padding: 1rem 0.75rem;
    border-radius: var(--radius-md) 0 0 var(--radius-md);
    cursor: pointer;
    writing-mode: vertical-rl;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-normal);
}

.qrcode-trigger:hover {
    padding-right: 1rem;
}

.trigger-icon {
    font-size: 1.25rem;
}

.trigger-text {
    font-size: 0.875rem;
    font-weight: 500;
}

.qrcode-panel {
    position: absolute;
    right: 100%;
    top: 50%;
    transform: translateY(-50%) translateX(20px);
    background: var(--bg-color);
    padding: 1.5rem;
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    border: 1px solid var(--border-light);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-normal);
    min-width: 200px;
}

.qrcode-float:hover .qrcode-panel {
    opacity: 1;
    visibility: visible;
    transform: translateY(-50%) translateX(0);
}

.qrcode-content {
    text-align: center;
}

.qrcode-image {
    width: 160px;
    height: 160px;
    margin: 0 auto 1rem;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    border: 1px solid var(--border-light);
}

.qrcode-placeholder svg {
    width: 120px;
    height: 120px;
}

.qrcode-tip {
    font-size: 0.9375rem;
    color: var(--text-primary);
    font-weight: 500;
    margin-bottom: 0.25rem;
}

.qrcode-tip-sub {
    font-size: 0.8125rem;
    color: var(--text-light);
}

/* ==================== 
   返回顶部
   ==================== */
.back-to-top {
    position: fixed;
    right: 20px;
    bottom: 20px;
    width: 44px;
    height: 44px;
    background: var(--bg-color);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
    transition: all var(--transition-normal);
    box-shadow: var(--shadow-sm);
    z-index: 998;
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.back-to-top:hover {
    background: var(--primary-lighter);
    border-color: var(--primary-color);
}

.back-to-top svg {
    width: 20px;
    height: 20px;
    color: var(--text-secondary);
}

/* ==================== 
   响应式设计
   ==================== */
@media (max-width: 1024px) {
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 3rem;
    }
    
    .about-visual {
        order: -1;
    }
    
    .about-text {
        text-align: center;
    }
    
    .about-text .section-title::after {
        left: 50%;
        transform: translateX(-50%);
    }
    
    .about-stats {
        justify-content: center;
    }
}

@media (max-width: 768px) {
    html {
        font-size: 15px;
    }
    
    .nav-menu {
        position: fixed;
        top: 70px;
        left: 0;
        right: 0;
        background: var(--bg-color);
        flex-direction: column;
        padding: 1.5rem;
        gap: 0;
        border-bottom: 1px solid var(--border-light);
        box-shadow: var(--shadow-md);
        transform: translateY(-100%);
        opacity: 0;
        visibility: hidden;
        transition: all var(--transition-normal);
    }
    
    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        visibility: visible;
    }
    
    .nav-menu li {
        width: 100%;
    }
    
    .nav-link {
        display: block;
        padding: 1rem;
        text-align: center;
        border-bottom: 1px solid var(--border-light);
    }
    
    .nav-link::after {
        display: none;
    }
    
    .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(5px, -5px);
    }
    
    .hero-section {
        padding-top: 90px;
    }
    
    .hero-visual {
        flex-direction: column;
        align-items: center;
    }
    
    .visual-card {
        width: 100%;
        max-width: 280px;
    }
    
    .features-section,
    .advantages-section,
    .about-section,
    .contact-section {
        padding: 4rem 0;
    }
    
    .section-header {
        margin-bottom: 3rem;
    }
    
    .qrcode-float {
        right: -48px;
        transition: right var(--transition-normal);
    }
    
    .qrcode-float:hover {
        right: 0;
    }
    
    .qrcode-panel {
        position: fixed;
        right: 10px;
        top: auto;
        bottom: 100px;
        transform: none;
    }
    
    .qrcode-float:hover .qrcode-panel {
        transform: none;
    }
}

@media (max-width: 480px) {
    html {
        font-size: 14px;
    }
    
    .hero-buttons {
        flex-direction: column;
        width: 100%;
        max-width: 280px;
        margin: 0 auto;
    }
    
    .btn {
        width: 100%;
    }
    
    .about-stats {
        gap: 2rem;
    }
    
    .stat-item {
        min-width: 80px;
    }
    
    .advantage-item {
        flex-direction: column;
        text-align: center;
    }
    
    .contact-form-wrapper {
        padding: 1.5rem;
    }
}

/* 打印样式 */
@media print {
    .header,
    .qrcode-float,
    .back-to-top {
        display: none;
    }
    
    .hero-section {
        min-height: auto;
        padding-top: 2rem;
    }
}