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

:root {
    --primary-color: #FF6B6B;
    --secondary-color: #4ECDC4;
    --accent-color: #FFE66D;
    --text-primary: #2d3436;
    --text-secondary: #636e72;
    --bg-light: #f8f9fa;
    --bg-white: #ffffff;
    --border-color: #e9ecef;
    --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.12);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--bg-white);
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

/* 顶部导航栏 */
.header {
    background-color: var(--bg-white);
    box-shadow: var(--shadow-sm);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-content {
    display: flex;
    align-items: center;
    justify-content: space-between;
    height: 70px;
}

.logo {
    display: flex;
    align-items: center;
    gap: 12px;
    font-size: 24px;
    font-weight: 700;
    color: var(--text-primary);
    text-decoration: none;
}

.logo-img {
    display: block;
    object-fit: contain;
}

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

.nav-menu {
    display: flex;
    gap: 40px;
}

.nav-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 16px;
    transition: color 0.3s;
    position: relative;
}

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

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    right: 0;
    height: 2px;
    background-color: var(--primary-color);
}

.download-btn-small {
    background: linear-gradient(135deg, var(--primary-color), #ff5252);
    color: white;
    border: none;
    padding: 10px 24px;
    border-radius: 25px;
    font-size: 14px;
    font-weight: 600;
    cursor: pointer;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 12px rgba(255, 107, 107, 0.3);
    text-decoration: none;
    display: inline-block;
}

.download-btn-small:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 16px rgba(255, 107, 107, 0.4);
}

/* 英雄区域 */
.hero {
    padding: 80px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    position: relative;
    overflow: hidden;
    min-height: 600px;
}

.hero-video {
    position: absolute;
    top: 50%;
    left: 50%;
    min-width: 100%;
    min-height: 100%;
    width: auto;
    height: auto;
    transform: translate(-50%, -50%);
    z-index: 0;
    object-fit: cover;
}

.hero .container {
    position: relative;
    z-index: 2;
}

.hero-content {
    display: grid;
    grid-template-columns: 1.2fr 1fr;
    gap: 60px;
    align-items: center;
}

.hero-title {
    font-size: 48px;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 24px;
    color: #ffffff;
    text-shadow: 2px 2px 8px rgba(0, 0, 0, 0.8);
}

.hero-description {
    font-size: 18px;
    color: #f8f9fa;
    margin-bottom: 40px;
    line-height: 1.8;
    text-shadow: 1px 1px 6px rgba(0, 0, 0, 0.8);
}

.download-buttons {
    display: flex;
    gap: 16px;
    margin-bottom: 50px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    padding: 14px 32px;
    border-radius: 30px;
    font-size: 16px;
    font-weight: 600;
    text-decoration: none;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary-color), #ff5252);
    color: white;
    box-shadow: 0 4px 16px rgba(255, 107, 107, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 20px rgba(255, 107, 107, 0.4);
}

.btn-secondary {
    background: var(--bg-white);
    color: var(--text-primary);
    border-color: var(--border-color);
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: var(--bg-light);
    transform: translateY(-3px);
    box-shadow: var(--shadow-lg);
}

.stats {
    display: flex;
    gap: 50px;
}

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

.stat-number {
    font-size: 32px;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 8px;
}

.stat-label {
    font-size: 14px;
    color: #f8f9fa;
    text-shadow: 1px 1px 4px rgba(0, 0, 0, 0.8);
}

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

.app-preview {
    width: 100%;
    max-width: 400px;
    height: auto;
    filter: drop-shadow(0 20px 40px rgba(0, 0, 0, 0.3));
    animation: float 3s ease-in-out infinite;
}

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

/* 功能特点 */
.features {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.section-title {
    font-size: 40px;
    font-weight: 700;
    text-align: center;
    margin-bottom: 16px;
    color: var(--text-primary);
}

.section-description {
    font-size: 18px;
    color: var(--text-secondary);
    text-align: center;
    margin-bottom: 60px;
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.feature-card {
    padding: 40px 30px;
    background: var(--bg-white);
    border-radius: 16px;
    border: 1px solid var(--border-color);
    transition: all 0.3s;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.feature-icon {
    margin-bottom: 24px;
}

.feature-title {
    font-size: 20px;
    font-weight: 600;
    margin-bottom: 12px;
    color: var(--text-primary);
}

.feature-description {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 关于我们 */
.about {
    padding: 100px 0;
    background-color: var(--bg-white);
}

.about-content {
    display: flex;
    flex-direction: column;
    gap: 50px;
    margin-top: 60px;
    max-width: 1000px;
    margin-left: auto;
    margin-right: auto;
}

.about-intro {
    text-align: center;
    padding: 40px;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
    border-radius: 20px;
}

.about-main-title {
    font-size: 26px;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 24px;
    line-height: 1.4;
}

.about-main-text {
    font-size: 17px;
    color: var(--text-secondary);
    line-height: 1.9;
    margin-bottom: 16px;
    text-align: left;
}

.about-main-text:last-child {
    margin-bottom: 0;
}

.company-info {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.info-card {
    background: var(--bg-white);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    padding: 30px 24px;
    text-align: center;
    transition: all 0.3s;
}

.info-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: transparent;
}

.info-icon {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

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

.info-title {
    font-size: 20px;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 12px;
}

.info-text {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.8;
}

.contact-link {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 600;
    transition: color 0.3s;
}

.contact-link:hover {
    color: #ff5252;
    text-decoration: underline;
}


/* 下载区域 */
.download-section {
    padding: 100px 0;
    background: linear-gradient(135deg, #f8f9fa 0%, #e9ecef 100%);
}

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

.download-info {
    max-width: 800px;
    margin: 0 auto;
}

.qr-codes {
    display: flex;
    justify-content: center;
    gap: 60px;
    margin: 60px 0;
}

.qr-code-item {
    text-align: center;
}

.qr-placeholder {
    background: var(--bg-white);
    padding: 20px;
    border-radius: 16px;
    box-shadow: var(--shadow-md);
    margin-bottom: 16px;
    transition: all 0.3s;
}

.qr-placeholder:hover {
    transform: scale(1.05);
    box-shadow: var(--shadow-lg);
}

.qr-label {
    font-size: 16px;
    font-weight: 600;
    color: var(--text-primary);
}

.download-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    margin-top: 40px;
}

.stat-badge {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    background: var(--bg-white);
    border-radius: 25px;
    box-shadow: var(--shadow-sm);
    font-size: 15px;
    font-weight: 600;
    color: var(--text-primary);
}

/* 底部信息 */
.footer {
    background-color: #2d3436;
    color: #b2bec3;
    padding: 40px 0;
}

.footer-bottom {
    text-align: center;
}

.footer-bottom p {
    font-size: 14px;
    color: #b2bec3;
    margin: 8px 0;
}

.beian-link {
    color: #b2bec3;
    text-decoration: none;
    transition: color 0.3s;
}

.beian-link:hover {
    color: #ffffff;
    text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 968px) {
    .hero-content {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .hero-title {
        font-size: 36px;
    }

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

    .nav-menu {
        display: none;
    }

    .company-info {
        grid-template-columns: 1fr;
    }

}

@media (max-width: 640px) {
    .hero-title {
        font-size: 28px;
    }

    .hero-description {
        font-size: 16px;
    }

    .download-buttons {
        flex-direction: column;
    }

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

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

    .qr-codes {
        flex-direction: column;
        align-items: center;
        gap: 30px;
    }

    .download-stats {
        flex-direction: column;
        gap: 16px;
    }

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

    .company-info {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .about-main-title {
        font-size: 22px;
    }

    .about-intro {
        padding: 30px 24px;
    }
}