/* 全局样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --primary-color: #FF6B35; /* 橙红色，温暖活力 */
    --secondary-color: #2C3E50; /* 深灰蓝，稳重 */
    --background-color: #F8F9FA; /* 浅灰背景 */
    --text-color: #333333; /* 深灰文字 */
    --light-text: #666666; /* 浅灰文字 */
    --white: #FFFFFF;
    --border-color: #E0E0E0;
    --shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
    --shadow-hover: 0 6px 20px rgba(0, 0, 0, 0.15);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", sans-serif;
    font-size: 18px; /* 大字体，适合中老年阅读 */
    line-height: 1.8;
    color: var(--text-color);
    background-color: var(--white);
    overflow-x: hidden;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* 导航栏 */
.navbar {
    background-color: var(--white);
    box-shadow: var(--shadow);
    position: sticky;
    top: 0;
    z-index: 1000;
    padding: 15px 0;
}

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

.logo {
    display: flex;
    align-items: center;
    gap: 10px;
}

.logo img {
    height: 40px;
    width: auto;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: var(--primary-color);
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
    align-items: center;
}

.nav-menu a {
    text-decoration: none;
    color: var(--text-color);
    font-size: 18px;
    font-weight: 500;
    transition: color 0.3s;
}

.nav-menu a:hover {
    color: var(--primary-color);
}

.download-btn-small {
    background-color: var(--primary-color);
    color: var(--white);
    border: none;
    padding: 12px 24px;
    border-radius: 8px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
}

.download-btn-small:hover {
    background-color: #E55A2B;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

/* Hero区域 */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #FFF5F0 0%, #FFFFFF 100%);
}

.hero-content {
    display: flex;
    align-items: center;
    gap: 60px;
}

.hero-text {
    flex: 1;
}

.hero-title {
    font-size: 56px;
    font-weight: bold;
    color: var(--primary-color);
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-subtitle {
    font-size: 28px;
    color: var(--secondary-color);
    margin-bottom: 30px;
    font-weight: 600;
}

.hero-description {
    font-size: 20px;
    color: var(--light-text);
    margin-bottom: 40px;
    line-height: 2;
}

.hero-buttons {
    display: flex;
    gap: 20px;
}

.btn {
    padding: 16px 32px;
    border: none;
    border-radius: 12px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    display: flex;
    align-items: center;
    gap: 10px;
}

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

.btn-primary:hover {
    background-color: #E55A2B;
    transform: translateY(-2px);
    box-shadow: var(--shadow-hover);
}

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

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

.btn-icon {
    font-size: 24px;
}

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

.phone-mockup {
    width: 320px;
    height: 640px;
    background: #000;
    border-radius: 40px;
    padding: 15px;
    box-shadow: var(--shadow-hover);
}

.phone-screen {
    width: 100%;
    height: 100%;
    background: #fff;
    border-radius: 30px;
    overflow: hidden;
}

.phone-screen img {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 功能特点区域 */
.features {
    padding: 80px 0;
    background-color: var(--background-color);
}

.section-header {
    text-align: center;
    margin-bottom: 60px;
}

.section-title {
    font-size: 42px;
    font-weight: bold;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.section-subtitle {
    font-size: 22px;
    color: var(--light-text);
}

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

.feature-card {
    background: var(--white);
    padding: 40px 30px;
    border-radius: 16px;
    text-align: center;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-hover);
}

.feature-icon {
    font-size: 56px;
    margin-bottom: 20px;
}

.feature-title {
    font-size: 24px;
    font-weight: bold;
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.feature-description {
    font-size: 18px;
    color: var(--light-text);
    line-height: 1.8;
}

/* 应用展示区域 */
.showcase {
    padding: 80px 0;
}

.showcase-slider {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 40px;
}

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

.showcase-image {
    margin-bottom: 20px;
}

.showcase-image img {
    width: 100%;
    max-width: 320px;
    height: auto;
    border-radius: 20px;
    box-shadow: var(--shadow);
}

.showcase-text h3 {
    font-size: 24px;
    color: var(--secondary-color);
    margin-bottom: 10px;
}

.showcase-text p {
    font-size: 18px;
    color: var(--light-text);
}

/* 适用人群区域 */
.audience {
    padding: 80px 0;
    background-color: var(--background-color);
}

.audience-content {
    max-width: 800px;
    margin: 0 auto;
}

.audience-list {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
}

.audience-item {
    background: var(--white);
    padding: 25px 20px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    gap: 15px;
    box-shadow: var(--shadow);
    transition: all 0.3s;
}

.audience-item:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.audience-icon {
    font-size: 36px;
}

.audience-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--secondary-color);
}

/* 下载区域 */
.download {
    padding: 80px 0;
    background: linear-gradient(135deg, #FF6B35 0%, #FF8C5A 100%);
    color: var(--white);
}

.download-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.download-title {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: 20px;
}

.download-description {
    font-size: 24px;
    margin-bottom: 50px;
    opacity: 0.95;
}

.download-options {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
}

.download-option {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 20px;
}

.qrcode {
    width: 200px;
    height: 200px;
    background: var(--white);
    border-radius: 16px;
    padding: 15px;
    box-shadow: var(--shadow);
}

.qrcode img {
    width: 100%;
    height: 100%;
    object-fit: contain;
}

.qrcode-text {
    font-size: 20px;
    font-weight: 600;
    color: var(--white);
}

.download-divider {
    font-size: 28px;
    font-weight: bold;
    opacity: 0.8;
}

.download-btn-large {
    background: var(--white);
    color: var(--primary-color);
    border: none;
    padding: 20px 40px;
    border-radius: 16px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 20px;
    transition: all 0.3s;
    box-shadow: var(--shadow);
}

.download-btn-large:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-hover);
}

.download-icon {
    font-size: 36px;
}

.download-btn-text {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
}

.download-btn-title {
    font-size: 22px;
    font-weight: bold;
}

.download-btn-version {
    font-size: 16px;
    opacity: 0.8;
    margin-top: 5px;
}

.download-hint {
    font-size: 16px;
    opacity: 0.9;
    margin-top: 10px;
}

/* 关于我们区域 */
.about {
    padding: 80px 0;
    background-color: var(--background-color);
}

.about-content {
    max-width: 900px;
    margin: 0 auto;
}

.about-text {
    font-size: 20px;
    line-height: 2;
    color: var(--text-color);
    margin-bottom: 25px;
    text-indent: 2em;
}

/* 页脚 */
.footer {
    background-color: var(--secondary-color);
    color: var(--white);
    padding: 60px 0 30px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 20px;
    margin-bottom: 20px;
    font-weight: 600;
}

.footer-section p {
    font-size: 16px;
    margin-bottom: 10px;
    opacity: 0.9;
}

.footer-section a {
    color: var(--white);
    text-decoration: none;
    transition: opacity 0.3s;
}

.footer-section a:hover {
    opacity: 0.7;
}

.footer-bottom {
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    padding-top: 30px;
    text-align: center;
}

.footer-bottom p {
    font-size: 16px;
    opacity: 0.8;
    margin-bottom: 10px;
}

.footer-bottom p a {
    color: var(--white);
    text-decoration: none;
    transition: opacity 0.3s;
}

.footer-bottom p a:hover {
    opacity: 0.7;
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        display: none;
    }
    
    .hero-content {
        flex-direction: column;
        text-align: center;
    }
    
    .hero-title {
        font-size: 42px;
    }
    
    .hero-subtitle {
        font-size: 22px;
    }
    
    .hero-description {
        font-size: 18px;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }
    
    .phone-mockup {
        width: 280px;
        height: 560px;
    }
    
    .section-title {
        font-size: 32px;
    }
    
    .section-subtitle {
        font-size: 18px;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
    }
    
    .download-title {
        font-size: 36px;
    }
    
    .download-description {
        font-size: 20px;
    }
    
    .download-options {
        flex-direction: column;
    }
    
    .about-text {
        font-size: 18px;
    }
}

/* 滚动动画 */
[data-aos] {
    opacity: 0;
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
}

[data-aos="fade-up"] {
    transform: translateY(30px);
}

[data-aos].aos-animate {
    opacity: 1;
    transform: translateY(0);
}