/* Base Styles */
:root {
    --primary-color: #4a6bff;
    --secondary-color: #45c9ff;
    --dark-color: #2d3748;
    --light-color: #f7fafc;
    --text-color: #333;
    --gradient: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --border-radius: 8px;
    --hamburger-color: var(--dark-color);
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: #f9fafc;
}

.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 15px;
}

a {
    text-decoration: none;
    color: var(--primary-color);
    transition: all 0.3s ease;
}

ul {
    list-style: none;
}

h1, h2, h3, h4 {
    margin-bottom: 15px;
    line-height: 1.2;
}

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

section {
    padding: 80px 0;
}

/* Header */
header {
    background-color: white;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px 15px;
}

/* Language Switch */
.language-switch {
    margin-left: 20px;
}

#language-select {
    padding: 8px 12px;
    border-radius: 20px;
    border: 1px solid #e2e8f0;
    background-color: white;
    color: var(--dark-color);
    font-size: 0.9rem;
    cursor: pointer;
    outline: none;
    transition: all 0.3s ease;
}

#language-select:hover {
    border-color: var(--primary-color);
}

#language-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 2px rgba(74, 107, 255, 0.2);
}

.logo h1 {
    font-size: 1.8rem;
    font-weight: bold;
    color: var(--primary-color);
    margin: 0;
}

nav ul {
    display: flex;
}

nav ul li {
    margin-left: 30px;
}

nav ul li a {
    color: var(--dark-color);
    font-weight: 500;
}

nav ul li a:hover {
    color: var(--primary-color);
}

.btn-download {
    background: var(--gradient);
    color: white !important;
    padding: 8px 20px;
    border-radius: 30px;
    font-weight: 600;
}

.btn-download:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow);
}

/* ===== 移动端汉堡按钮 ===== */
.nav-toggle {
    display: none;          /* 默认隐藏复选框 */
}

.nav-toggle-label {
    display: none;
    cursor: pointer;
    padding: 8px;
    margin-top: 8px;
    /* 让按钮垂直居中 */
    align-self: center;
}

.nav-toggle-label span,
.nav-toggle-label span::before,
.nav-toggle-label span::after {
    display: block;
    width: 26px;
    height: 3px;
    background: var(--hamburger-color);
    border-radius: 3px;
    transition: all .3s ease-in-out;
}

.nav-toggle-label span {
    position: relative;
}

.nav-toggle-label span::before,
.nav-toggle-label span::after {
    content: '';
    position: absolute;
}
.nav-toggle-label span::before { top: -8px; }
.nav-toggle-label span::after  { top:  8px; }

.wechatQR{width:20%; }

/* ===== 响应式 ≤768px ===== */
@media (max-width: 768px) {
    /* 显示汉堡按钮 */
    .nav-toggle-label {
        display: block;
        order: 2;            /* 让按钮在 logo 与语言选择器之间 */
    }

    /* 让语言选择器排到最后 */
    .language-switch {
        margin-left: 0;
        order: 3;
    }

    /* 折叠的导航 */
    nav {
        position: absolute;
        top: 100%;           /* header 高度正好 20+20+字体高度 */
        left: 0;
        width: 100%;
        background: white;
        box-shadow: 0 4px 6px rgba(0,0,0,.1);
        clip-path: polygon(0 0, 100% 0, 100% 0, 0 0);
        transition: clip-path .3s ease;
    }

    nav ul {
        flex-direction: column;
        padding: 15px 0;
    }

    nav ul li {
        margin: 0;
        text-align: center;
        padding: 10px 0;
    }

    /* 展开动画 */
    .nav-toggle:checked + .nav-toggle-label span {
        background: transparent;
    }
    .nav-toggle:checked + .nav-toggle-label span::before {
        transform: rotate(45deg) translate(5px, 5px);
    }
    .nav-toggle:checked + .nav-toggle-label span::after {
        transform: rotate(-45deg) translate(6px, -6px);
        background: var(--hamburger-color);
    }
    .nav-toggle:checked ~ nav {
        clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%);
    }
}

/* Hero Section */
.hero {
    padding-top: 150px;
    background-color: white;
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.hero-content {
    flex: 1;
    padding-right: 30px;
}

.hero-content h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.hero-content p {
    font-size: 1.1rem;
    margin-bottom: 30px;
    color: #64748b;
}

.hero-image {
    flex: 1;
    display: flex;
    justify-content: center;
}

.hero-image img {
    max-height: 500px;
    object-fit: contain;
}

.hero-buttons {
    display: flex;
    gap: 15px;
    flex-wrap: wrap;
}

.btn-app {
    display: inline-flex;
    align-items: center;
    padding: 12px 24px;
    background: var(--dark-color);
    color: white;
    border-radius: 30px;
    font-weight: 600;
    transition: all 0.3s ease;
}

.btn-app i {
    margin-right: 8px;
    font-size: 1.2rem;
}

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

/* Features */
.features {
    background-color: #f8f9ff;
    text-align: center;
}

.features h2 {
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--dark-color);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 30px;
}

.feature-item {
    background-color: white;
    padding: 40px 25px;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-10px);
}

.feature-icon {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 70px;
    height: 70px;
    background: var(--gradient);
    border-radius: 50%;
    margin-bottom: 20px;
}

.feature-icon i {
    font-size: 28px;
    color: white;
}

.feature-item h3 {
    font-size: 1.4rem;
    margin-bottom: 15px;
    color: var(--dark-color);
}

.feature-item p {
    color: #64748b;
}

/* Screenshots */
.screenshots {
    text-align: center;
    background-color: white;
}

.screenshots h2 {
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--dark-color);
}

.screenshots-slider {
    display: flex;
    gap: 20px;
    overflow-x: auto;
    padding: 20px 0;
    scroll-snap-type: x mandatory;
}

.screenshot {
    flex: 0 0 300px;
    scroll-snap-align: center;
    border-radius: var(--border-radius);
    overflow: hidden;
    box-shadow: var(--box-shadow);
    transition: transform 0.3s ease;
}

.screenshot img {
    width: 100%;
    height: 550px;
    object-fit: cover;
}

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

/* Stats */
.stats {
    background: var(--gradient);
    color: white;
    padding: 60px 0;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 30px;
    text-align: center;
}

.stat-item h3 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.stat-item p {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Testimonials */
.testimonials {
    text-align: center;
    background-color: #f8f9ff;
}

.testimonials h2 {
    font-size: 2.5rem;
    margin-bottom: 50px;
    color: var(--dark-color);
}

.testimonials-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
}

.testimonial {
    background-color: white;
    border-radius: var(--border-radius);
    padding: 30px;
    text-align: left;
    box-shadow: var(--box-shadow);
}

.testimonial-content {
    margin-bottom: 20px;
}

.testimonial-content p {
    font-style: italic;
    color: #4a5568;
    font-size: 1.1rem;
}

.testimonial-author h4 {
    font-size: 1.2rem;
    margin-bottom: 5px;
    color: var(--dark-color);
}

.testimonial-author p {
    color: #718096;
}

/* Download */
.download {
    text-align: center;
    background-color: white;
}

.download h2 {
    font-size: 2.5rem;
    margin-bottom: 20px;
    color: var(--dark-color);
}

.download p {
    font-size: 1.1rem;
    max-width: 600px;
    margin: 0 auto 40px;
    color: #64748b;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
}

/* Footer */
footer {
    background-color: var(--dark-color);
    color: white;
    padding: 70px 0 20px;
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    margin-bottom: 50px;
}

.footer-column h3 {
    font-size: 1.8rem;
    margin-bottom: 15px;
}

.footer-column h4 {
    font-size: 1.2rem;
    margin-bottom: 20px;
    color: #a0aec0;
}

.footer-column p {
    color: #cbd5e0;
}

.footer-column ul li {
    margin-bottom: 10px;
}

.footer-column ul li a {
    color: #cbd5e0;
}

.footer-column ul li a:hover {
    color: white;
}

.social-icons {
    display: flex;
    gap: 15px;
}

.social-icons a {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 40px;
    height: 40px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    color: white;
    transition: all 0.3s ease;
}

.social-icons a:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.copyright {
    text-align: center;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: #a0aec0;
}

/* Responsive */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-content {
        padding-right: 0;
        margin-bottom: 40px;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .features-grid, 
    .testimonials-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 768px) {
    header .container {
        flex-direction: column;
    }
    
    nav ul {
        margin-top: 20px;
    }
    
    nav ul li {
        margin: 0 15px;
    }
    
    .language-switch {
        margin: 15px 0 0 0;
    }
    
    .hero {
        padding-top: 180px;
    }
    
    .hero-content h1 {
        font-size: 2.3rem;
    }
    
    section {
        padding: 60px 0;
    }
    
    .screenshots-slider {
        justify-content: flex-start;
    }
    
    .footer-grid {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-icons {
        justify-content: center;
    }
}

@media (max-width: 690px) {
    .wechatQR{
        width:30%;
    }
}

@media (max-width: 480px) {
    .wechatQR{
        width:40%;
    }
    nav ul {
        flex-direction: column;
        align-items: center;
    }
    
    nav ul li {
        margin: 10px 0;
    }
    
    .btn-app {
        width: 100%;
        justify-content: center;
    }
    
    .feature-item,
    .testimonial {
        padding: 20px 15px;
    }
}