/*
 * 易背单词官网样式表
 * 主色调：#00DFBE (青绿色)
 * 设计风格：高端、酷炫、互联网APP产品风格
 */
/* CSS变量定义 */
:root {
    --primary-color: #00DFBE;
    --primary-dark: #00B89C;
    --primary-light: #33E8CC;
    --secondary-color: #0A1628;
    --text-primary: #1A1A2E;
    --text-secondary: #4A5568;
    --text-light: #718096;
    --bg-light: #F7FAFC;
    --bg-white: #FFFFFF;
    --border-color: #E2E8F0;
    --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.1);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 25px rgba(0, 0, 0, 0.15);
    --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.2);
    --gradient-primary: linear-gradient(135deg, #00DFBE 0%, #00B89C 100%);
    --gradient-hero: linear-gradient(135deg, #0A1628 0%, #1a365d 50%, #00DFBE 100%);
}
/* 基础重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
html {
    scroll-behavior: smooth;
}
body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    background: var(--bg-white);
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
/* 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: var(--shadow-sm);
    transition: all 0.3s ease;
}
.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}
.logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 24px;
    font-weight: 700;
    color: var(--primary-color);
}
.logo-icon {
    font-size: 28px;
}
.nav-links {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}
.nav-links a {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    transition: color 0.3s ease;
    position: relative;
}
.nav-links a:hover {
    color: var(--primary-color);
}
.nav-links a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}
.nav-links a:hover::after {
    width: 100%;
}
.nav-btn {
    background: var(--gradient-primary);
    color: white !important;
    padding: 10px 24px;
    border-radius: 25px;
    box-shadow: var(--shadow-md);
}
.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}
.hamburger {
    display: none;
    flex-direction: column;
    gap: 5px;
    cursor: pointer;
}
.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: all 0.3s ease;
}
/* 首页横幅 */
.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    padding-top: 70px;
    background: var(--gradient-hero);
    overflow: hidden;
}
.hero-bg {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    overflow: hidden;
}
.floating-words {
    position: absolute;
    width: 100%;
    height: 100%;
}
.word {
    position: absolute;
    color: rgba(0, 223, 190, 0.1);
    font-size: 24px;
    font-weight: 700;
    animation: float 6s ease-in-out infinite;
}
.w1 { top: 10%; left: 10%; animation-delay: 0s; }
.w2 { top: 20%; right: 15%; animation-delay: 1s; }
.w3 { top: 40%; left: 20%; animation-delay: 2s; }
.w4 { top: 60%; right: 10%; animation-delay: 3s; }
.w5 { top: 75%; left: 15%; animation-delay: 4s; }
.w6 { top: 85%; right: 20%; animation-delay: 5s; }
@keyframes float {
    0%, 100% { transform: translateY(0) rotate(0deg); opacity: 0.1; }
    50% { transform: translateY(-20px) rotate(5deg); opacity: 0.2; }
}
.hero-content {
    max-width: 1300px;
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}
.hero-title {
    font-size: 56px;
    font-weight: 900;
    line-height: 1.2;
    margin-bottom: 20px;
    color: white;
}
.gradient-text {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}
.hero-desc {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
    line-height: 1.8;
}
.hero-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 40px;
}
.btn {
    padding: 14px 32px;
    border-radius: 30px;
    font-weight: 600;
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: all 0.3s ease;
    cursor: pointer;
    border: none;
    font-size: 16px;
}
.btn-primary {
    background: var(--gradient-primary);
    color: white;
    box-shadow: 0 4px 15px rgba(0, 223, 190, 0.4);
}
.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 223, 190, 0.5);
}
.btn-secondary {
    background: rgba(255, 255, 255, 0.1);
    color: white;
    border: 2px solid rgba(255, 255, 255, 0.3);
    backdrop-filter: blur(10px);
}
.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: var(--primary-color);
}
.btn svg {
    width: 20px;
    height: 20px;
}
.hero-stats {
    display: flex;
    gap: 40px;
}
.stat-item {
    text-align: center;
}
.stat-number {
    font-size: 36px;
    font-weight: 900;
    color: var(--primary-color);
    display: inline;
}
.stat-unit {
    font-size: 20px;
    font-weight: 700;
    color: var(--primary-color);
}
.stat-label {
    display: block;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
    margin-top: 5px;
}
.hero-image {
    display: flex;
    justify-content: center;
    align-items: center;
}
/* iPad Mockup 样式 */
.ipad-mockup {
    position: relative;
    perspective: 1000px;
}
.ipad-frame {
    width: 834px;
    height: 556px;
    background: linear-gradient(145deg, #2d2d2d, #1a1a1a);
    border-radius: 24px;
    padding: 16px;
    box-shadow:
            0 25px 50px rgba(0, 0, 0, 0.3),
            inset 0 1px 1px rgba(255, 255, 255, 0.1);
    transform: rotateY(-8deg) rotateX(3deg);
    transition: transform 0.5s ease;
    position: relative;
}
.ipad-frame::before {
    content: '';
    /*position: absolute;*/
    bottom: 8px;
    left: 50%;
    transform: translateX(-50%);
    width: 40px;
    height: 40px;
    background: #1a1a1a;
    border-radius: 50%;
    z-index: 10;
}
.ipad-frame:hover {
    transform: rotateY(0deg) rotateX(0deg);
}
.ipad-screen {
    width: 100%;
    height: 100%;
    background: #000;
    border-radius: 12px;
    overflow: hidden;
    position: relative;
}
.ipad-shadow {
    position: absolute;
    bottom: -30px;
    left: 50%;
    transform: translateX(-50%);
    width: 350px;
    height: 30px;
    background: radial-gradient(ellipse, rgba(0, 0, 0, 0.4), transparent);
    filter: blur(15px);
}
/* 轮播样式 */
.carousel {
    width: 100%;
    height: 100%;
    position: relative;
}
.carousel-inner {
    width: 100%;
    height: 100%;
    position: relative;
}
.carousel-slide {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    opacity: 0;
    transition: opacity 0.6s ease-in-out;
}
.carousel-slide.active {
    opacity: 1;
}
.carousel-slide img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}
.slide-caption {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0, 0, 0, 0.8));
    color: white;
    padding: 30px 20px 20px;
    font-size: 18px;
    font-weight: 600;
    text-align: center;
}
/* 轮播按钮 */
.carousel-btn {
    position: absolute;
    top: 50%;
    transform: translateY(-50%);
    width: 36px;
    height: 36px;
    background: rgba(255, 255, 255, 0.9);
    border: none;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
    z-index: 10;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}
.carousel-btn:hover {
    background: #00DFBE;
    transform: translateY(-50%) scale(1.1);
}
.carousel-btn svg {
    width: 20px;
    height: 20px;
    stroke: #1a1a2e;
}
.carousel-btn:hover svg {
    stroke: white;
}
.carousel-btn.prev {
    left: 12px;
}
.carousel-btn.next {
    right: 12px;
}
/* 轮播指示器 */
.carousel-indicators {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: 10px;
    z-index: 10;
}
.indicator {
    width: 8px;
    height: 8px;
    background: rgba(255, 255, 255, 0.5);
    border-radius: 50%;
    cursor: pointer;
    transition: all 0.3s ease;
}
.indicator.active {
    background: #00DFBE;
    width: 24px;
    border-radius: 4px;
}
.indicator:hover {
    background: rgba(255, 255, 255, 0.8);
}
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    animation: bounce 2s infinite;
}
.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 13px;
    position: relative;
}
.wheel {
    width: 4px;
    height: 8px;
    background: white;
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s infinite;
}
@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}
@keyframes scroll {
    0% { opacity: 1; top: 8px; }
    100% { opacity: 0; top: 20px; }
}
/*ipad*/



.phone-mockup {
    position: relative;
    perspective: 1000px;
}
.phone-frame {
    width: 300px;
    height: 600px;
    background: linear-gradient(145deg, #1a1a2e, #16213e);
    border-radius: 40px;
    padding: 12px;
    box-shadow: var(--shadow-xl);
    transform: rotateY(-10deg) rotateX(5deg);
    transition: transform 0.5s ease;
}
.phone-frame:hover {
    transform: rotateY(0deg) rotateX(0deg);
}
.phone-screen {
    background: white;
    border-radius: 30px;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
}
.app-header {
    background: var(--gradient-primary);
    padding: 20px;
    text-align: center;
}
.app-title {
    color: white;
    font-size: 18px;
    font-weight: 700;
}
.app-content {
    flex: 1;
    padding: 20px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}
.word-card {
    background: var(--bg-light);
    border-radius: 15px;
    padding: 20px;
    text-align: center;
    box-shadow: var(--shadow-md);
}
.word-main {
    margin-bottom: 10px;
}
.word-text {
    display: block;
    font-size: 28px;
    font-weight: 700;
    color: var(--text-primary);
}
.word-phonetic {
    color: var(--text-light);
    font-size: 14px;
}
.word-meaning {
    color: var(--text-secondary);
    margin: 10px 0;
}
.word-example {
    font-style: italic;
    color: var(--text-light);
    font-size: 13px;
}
.progress-bar {
    background: var(--border-color);
    border-radius: 10px;
    height: 8px;
    margin: 15px 0;
    overflow: hidden;
}
.progress-fill {
    height: 100%;
    background: var(--gradient-primary);
    border-radius: 10px;
    transition: width 0.3s ease;
}
.app-buttons {
    display: flex;
    gap: 10px;
}
.app-btn {
    flex: 1;
    padding: 12px;
    border: none;
    border-radius: 10px;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}
.app-btn.forget {
    background: #FEF2F2;
    color: #DC2626;
}
.app-btn.know {
    background: var(--gradient-primary);
    color: white;
}
.app-btn:hover {
    transform: translateY(-2px);
}
.phone-shadow {
    position: absolute;
    bottom: -20px;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 20px;
    background: radial-gradient(ellipse, rgba(0, 0, 0, 0.3), transparent);
    filter: blur(10px);
}
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    color: rgba(255, 255, 255, 0.7);
    font-size: 14px;
    animation: bounce 2s infinite;
}
.mouse {
    width: 26px;
    height: 40px;
    border: 2px solid rgba(255, 255, 255, 0.5);
    border-radius: 13px;
    position: relative;
}
.wheel {
    width: 4px;
    height: 8px;
    background: white;
    border-radius: 2px;
    position: absolute;
    top: 8px;
    left: 50%;
    transform: translateX(-50%);
    animation: scroll 1.5s infinite;
}
@keyframes bounce {
    0%, 100% { transform: translateX(-50%) translateY(0); }
    50% { transform: translateX(-50%) translateY(10px); }
}
@keyframes scroll {
    0% { opacity: 1; top: 8px; }
    100% { opacity: 0; top: 20px; }
}
/* Section通用样式 */
.section-header {
    text-align: center;
    margin-bottom: 60px;
}
.section-tag {
    display: inline-block;
    background: rgba(0, 223, 190, 0.1);
    color: var(--primary-color);
    padding: 8px 20px;
    border-radius: 20px;
    font-weight: 600;
    font-size: 14px;
    margin-bottom: 15px;
}
.section-title {
    font-size: 42px;
    font-weight: 900;
    color: var(--text-primary);
    margin-bottom: 15px;
}
.section-desc {
    font-size: 18px;
    color: var(--text-secondary);
    max-width: 600px;
    margin: 0 auto;
}
/* 产品特色 */
.features {
    padding: 100px 0;
    background: var(--bg-light);
}
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
}
.feature-card {
    background: white;
    padding: 40px 30px;
    border-radius: 20px;
    box-shadow: var(--shadow-md);
    transition: all 0.3s ease;
    border: 2px solid transparent;
}
.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}
.feature-icon {
    width: 70px;
    height: 70px;
    background: rgba(0, 223, 190, 0.1);
    border-radius: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 25px;
    transition: all 0.3s ease;
}
.feature-card:hover .feature-icon {
    background: var(--gradient-primary);
}
.feature-icon svg {
    width: 35px;
    height: 35px;
    stroke: var(--primary-color);
    transition: all 0.3s ease;
}
.feature-card:hover .feature-icon svg {
    stroke: white;
}
.feature-card h3 {
    font-size: 22px;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--text-primary);
}
.feature-card p {
    color: var(--text-secondary);
    line-height: 1.8;
}
/* 功能介绍 */
.functions {
    padding: 100px 0;
    background: white;
}
.function-showcase {
    display: flex;
    flex-direction: column;
    gap: 80px;
}
.function-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
}
.function-item.reverse {
    direction: rtl;
}
.function-item.reverse .function-content {
    direction: ltr;
}
.function-number {
    font-size: 64px;
    font-weight: 900;
    color: rgba(0, 223, 190, 0.2);
    line-height: 1;
    margin-bottom: -20px;
    display: block;
}
.function-content h3 {
    font-size: 32px;
    font-weight: 800;
    margin-bottom: 20px;
    color: var(--text-primary);
}
.function-content p {
    font-size: 16px;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 20px;
}
.function-list {
    list-style: none;
    display: flex;
    flex-direction: column;
    gap: 12px;
}
.function-list li {
    display: flex;
    align-items: center;
    gap: 10px;
    color: var(--text-secondary);
}
.check {
    color: var(--primary-color);
    font-weight: 700;
}
.function-image img {
    width: 100%;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
    transition: transform 0.3s ease;
}
.function-image img:hover {
    transform: scale(1.02);
}
/* 下载区域 */
.download {
    padding: 100px 0;
    background: var(--gradient-hero);
    position: relative;
    overflow: hidden;
}
.download::before {
    content: '';
    position: absolute;
    top: -50%;
    right: -20%;
    width: 600px;
    height: 600px;
    background: radial-gradient(circle, rgba(0, 223, 190, 0.15), transparent);
    border-radius: 50%;
}
.download-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 60px;
    align-items: center;
    position: relative;
    z-index: 1;
}
.download-text h2 {
    font-size: 42px;
    font-weight: 900;
    color: white;
    margin-bottom: 15px;
    line-height: 1.2;
}
.download-text p {
    font-size: 18px;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 30px;
}
.download-buttons {
    display: flex;
    gap: 15px;
    margin-bottom: 30px;
}
.download-btn {
    display: flex;
    align-items: center;
    gap: 12px;
    background: white;
    padding: 15px 25px;
    border-radius: 15px;
    text-decoration: none;
    color: var(--text-primary);
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}
.download-btn:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-xl);
}
.download-btn svg {
    width: 32px;
    height: 32px;
}
.download-btn.android svg {
    color: #3DDC84;
}
.download-btn.ios svg {
    color: #000000;
}
.btn-text {
    display: flex;
    flex-direction: column;
}
.btn-small {
    font-size: 12px;
    color: var(--text-light);
}
.btn-big {
    font-size: 18px;
    font-weight: 700;
}
.download-qrcode {
    text-align: center;
}
.download-qrcode img {
    width: 150px;
    height: 150px;
    border-radius: 15px;
    box-shadow: var(--shadow-md);
    margin-bottom: 10px;
    background: white;
    padding: 10px;
}
.download-qrcode p {
    font-size: 14px;
    color: rgba(255, 255, 255, 0.8);
}
.download-image img {
    width: 100%;
    border-radius: 20px;
    box-shadow: var(--shadow-xl);
}
/* 联系我们 */
.contact {
    padding: 100px 0;
    background: var(--bg-light);
}
.contact-wrapper {
    display: grid;
    grid-template-columns: 1fr 1.5fr;
    gap: 60px;
}
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}
.info-item {
    display: flex;
    gap: 20px;
    align-items: flex-start;
}
.info-icon {
    width: 50px;
    height: 50px;
    background: rgba(0, 223, 190, 0.1);
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
}
.info-icon svg {
    width: 24px;
    height: 24px;
    stroke: var(--primary-color);
}
.info-content h4 {
    font-size: 18px;
    font-weight: 700;
    margin-bottom: 5px;
    color: var(--text-primary);
}
.info-content p {
    color: var(--text-secondary);
}
.contact-form {
    background: white;
    padding: 40px;
    border-radius: 20px;
    box-shadow: var(--shadow-lg);
}
.form-group {
    margin-bottom: 25px;
}
.form-group label {
    display: block;
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
}
.form-group input,
.form-group select,
.form-group textarea {
    width: 100%;
    padding: 14px 18px;
    border: 2px solid var(--border-color);
    border-radius: 12px;
    font-size: 15px;
    font-family: inherit;
    transition: all 0.3s ease;
    background: var(--bg-white);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 223, 190, 0.1);
}
.form-group textarea {
    resize: vertical;
    min-height: 120px;
}
.submit-btn {
    width: 100%;
    padding: 16px;
    background: var(--gradient-primary);
    color: white;
    border: none;
    border-radius: 12px;
    font-size: 16px;
    font-weight: 700;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    transition: all 0.3s ease;
    box-shadow: var(--shadow-md);
}
.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(0, 223, 190, 0.4);
}
.submit-btn svg {
    width: 20px;
    height: 20px;
}
.form-success {
    display: none;
    text-align: center;
    padding: 40px;
}
.form-success.active {
    display: block;
}
.success-icon {
    width: 80px;
    height: 80px;
    background: rgba(0, 223, 190, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 20px;
    font-size: 40px;
    color: var(--primary-color);
    font-weight: 700;
}
.form-success h3 {
    font-size: 24px;
    font-weight: 700;
    margin-bottom: 10px;
    color: var(--text-primary);
}
.form-success p {
    color: var(--text-secondary);
}
/* 页脚 */
.footer {
    background: var(--secondary-color);
    padding: 60px 0 30px;
    color: rgba(255, 255, 255, 0.8);
}
.footer-content {
    display: grid;
    grid-template-columns: 1.5fr 2fr;
    gap: 60px;
    margin-bottom: 40px;
}
.footer-brand .logo {
    margin-bottom: 15px;
}
.footer-brand p {
    margin-bottom: 20px;
    color: rgba(255, 255, 255, 0.7);
}
.social-links {
    display: flex;
    gap: 15px;
}
.social-link {
    width: 40px;
    height: 40px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.3s ease;
}
.social-link:hover {
    background: var(--primary-color);
    transform: translateY(-3px);
}
.social-link svg {
    width: 20px;
    height: 20px;
    fill: white;
}
.footer-links {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
}
.footer-column h4 {
    color: white;
    font-size: 16px;
    font-weight: 700;
    margin-bottom: 20px;
}
.footer-column ul {
    list-style: none;
}
.footer-column li {
    margin-bottom: 12px;
}
.footer-column a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: color 0.3s ease;
}
.footer-column a:hover {
    color: var(--primary-color);
}
.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
    font-size: 14px;
    color: rgba(255, 255, 255, 0.6);
}
/* 响应式设计 */
@media (max-width: 968px) {
    .hero-content,
    .contact-wrapper,
    .download-content,
    .footer-content {
        grid-template-columns: 1fr;
    }

    .function-item,
    .function-item.reverse {
        grid-template-columns: 1fr;
        direction: ltr;
    }

    .hero-title {
        font-size: 42px;
    }

    .section-title {
        font-size: 32px;
    }

    .nav-links {
        display: none;
    }

    .hamburger {
        display: flex;
    }

    .footer-links {
        grid-template-columns: 1fr;
        gap: 30px;
    }
}
@media (max-width: 640px) {
    .hero-buttons,
    .download-buttons {
        flex-direction: column;
    }

    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }

    .features-grid {
        grid-template-columns: 1fr;
    }

    .phone-frame {
        width: 260px;
        height: 520px;
    }
}

/* 二维码弹窗默认隐藏 */
.qrcode-popup {
    position: absolute;
    bottom: 100px; /* 弹窗显示在上方 */
    left: 50%;
    transform: translateX(-50%);
    display: none;
    padding: 10px;
    background: #fff;
    border: 1px solid #eee;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    z-index: 999;
}

.qrcode-popup img {
    width: 150px;
    height: 150px;
    display: block;
}

/* hover时显示弹窗 */
.download-btn:hover .qrcode-popup {
    display: block;
}