* {
    box-sizing: border-box;
}

html {
    height: 100%;
    scroll-behavior: smooth;
}

body {
    display: flex;
    flex-direction: column;
    margin: 0;
    padding: 0;
    min-height: 100%;
    background: #EEF4F7;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
}

/* 导航栏 */
.nav {
    display: flex;
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    width: 100%;
    height: 88px;
    background-color: #FFFFFF;
    box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

.nav-left {
    display: flex;
    flex-direction: row;
    align-items: center;
    margin-left: 50px;
}

.nav-left span {
    font-size: 24px;
    font-weight: 600;
    color: #333333;
    margin-left: 20px;
}

.nav-right {
    display: flex;
    flex-direction: row;
    align-items: center;
    gap: 30px;
    margin-right: 50px;
}

.nav-link {
    font-size: 16px;
    font-weight: 500;
    color: #333333;
    text-decoration: none;
    transition: color 0.3s;
}

.nav-link:hover {
    color: #FC830E;
}

.download-btn {
    display: inline-block;
    padding: 12px 32px;
    font-size: 16px;
    font-weight: 600;
    color: #FFFFFF;
    background-color: #FC830E;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
}

.download-btn:hover {
    background-color: #E57509;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(252, 131, 14, 0.3);
}

.logo {
    height: 70px;
    border-radius: 12px;
    object-fit: contain;
}

/* 主横幅区域 */
.hero {
    width: 100%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 100px 50px;
    display: flex;
    justify-content: center;
    align-items: center;
}

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

.hero-title {
    font-size: 48px;
    font-weight: 700;
    color: #FFFFFF;
    margin: 0 0 20px 0;
    line-height: 1.3;
}

.hero-subtitle {
    font-size: 24px;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.95);
    margin: 0 0 40px 0;
}

.hero-download-btn {
    display: inline-block;
    padding: 18px 48px;
    font-size: 20px;
    font-weight: 600;
    color: #667eea;
    background-color: #FFFFFF;
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    text-decoration: none;
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.hero-download-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 12px 28px rgba(0, 0, 0, 0.2);
}

/* 公共标题样式 */
.section-title {
    font-size: 36px;
    font-weight: 700;
    color: #333333;
    text-align: center;
    margin: 0 0 10px 0;
}

.section-subtitle {
    font-size: 18px;
    font-weight: 400;
    color: #666666;
    text-align: center;
    margin: 0 0 60px 0;
}

/* 产品特点区域 */
.features {
    width: 100%;
    padding: 80px 50px;
    background: #FFFFFF;
}

.features-grid {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
}

.feature-card {
    background: #FFFFFF;
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    transition: all 0.3s;
    border: 2px solid #EEF4F7;
    cursor: pointer;
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: 0 12px 24px rgba(0, 0, 0, 0.1);
    border-color: #FC830E;
}

.feature-icon {
    font-size: 48px;
    margin-bottom: 15px;
    background: linear-gradient(135deg, #84FAB0 0%, #8FD3F4 100%);
    width: 80px;
    height: 80px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 15px;
}

.feature-card h3 {
    font-size: 20px;
    font-weight: 600;
    color: #333333;
    margin: 0 0 10px 0;
}

.feature-card p {
    font-size: 14px;
    font-weight: 400;
    color: #666666;
    margin: 0;
    line-height: 1.6;
}

/* 产品截图区域 */
.content {
    width: 100%;
    padding: 80px 50px;
    background: #EEF4F7;
}

.screenshots {
    display: flex;
    flex-direction: row;
    justify-content: center;
    align-items: center;
    gap: 40px;
    flex-wrap: wrap;
    max-width: 1400px;
    margin: 0 auto;
}

.screenshots img {
    height: 550px;
    border-radius: 20px;
    box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
    object-fit: contain;
    transition: all 0.3s;
}

.screenshots img:hover {
    transform: scale(1.05);
    box-shadow: 0 12px 32px rgba(0, 0, 0, 0.18);
}

/* 适合人群区域 */
.target-audience {
    width: 100%;
    padding: 80px 50px;
    background: #FFFFFF;
}

.audience-content {
    max-width: 1200px;
    margin: 0 auto;
}

.audience-main {
    margin-bottom: 50px;
    text-align: center;
}

.audience-main h3 {
    font-size: 28px;
    font-weight: 600;
    color: #333333;
    margin: 0 0 30px 0;
}

.audience-text {
    font-size: 16px;
    line-height: 1.8;
    color: #666666;
    margin: 0 auto 20px;
    max-width: 900px;
    text-align: left;
}

.audience-text strong {
    color: #FC830E;
    font-weight: 600;
}

.audience-cards {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 30px;
    margin-bottom: 50px;
}

.audience-card {
    background: #F8F9FA;
    border-radius: 16px;
    padding: 30px 20px;
    text-align: center;
    transition: all 0.3s;
    border: 2px solid transparent;
}

.audience-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.1);
    border-color: #FC830E;
    background: #FFFFFF;
}

.audience-card-icon {
    font-size: 48px;
    margin-bottom: 15px;
}

.audience-card h4 {
    font-size: 18px;
    font-weight: 600;
    color: #333333;
    margin: 0 0 10px 0;
}

.audience-card p {
    font-size: 14px;
    color: #666666;
    margin: 0;
    line-height: 1.6;
}

.audience-highlight {
    display: flex;
    justify-content: space-around;
    align-items: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    border-radius: 20px;
    padding: 40px;
    gap: 30px;
}

.highlight-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    flex: 1;
}

.highlight-label {
    font-size: 14px;
    font-weight: 500;
    color: rgba(255, 255, 255, 0.8);
    margin-bottom: 10px;
}

.highlight-value {
    font-size: 18px;
    font-weight: 600;
    color: #FFFFFF;
}

.foot {
    display: flex;
    width: 100%;
    background-color: #7A838B;
    height: 72px;
    justify-content: center;
    align-items: center;
}

.foot span {
    font-size: 12px;
    font-weight: 400;
    color: #FFFFFF;
}

.foot a {
    color: #FFFFFF;
    text-decoration: none;
}

.foot a:hover {
    text-decoration: underline;
}

/* 移动端适配 */
@media screen and (max-width: 1200px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
        gap: 25px;
    }
}

@media screen and (max-width: 900px) {
    .nav-left {
        margin-left: 20px;
    }

    .nav-left span {
        font-size: 20px;
    }

    .nav-right {
        margin-right: 20px;
        gap: 20px;
    }

    .nav-link {
        font-size: 14px;
    }

    .download-btn {
        padding: 10px 24px;
        font-size: 14px;
    }

    .hero {
        padding: 60px 30px;
    }

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

    .hero-subtitle {
        font-size: 18px;
    }

    .hero-download-btn {
        padding: 14px 36px;
        font-size: 18px;
    }

    .features {
        padding: 60px 30px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .section-title {
        font-size: 30px;
    }

    .section-subtitle {
        font-size: 16px;
        margin-bottom: 40px;
    }

    .content {
        padding: 60px 30px;
    }

    .screenshots {
        gap: 30px;
    }

    .screenshots img {
        height: 450px;
    }

    .target-audience {
        padding: 60px 30px;
    }

    .audience-cards {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
    }

    .audience-highlight {
        flex-direction: column;
        gap: 25px;
        padding: 30px;
    }
}

@media screen and (max-width: 768px) {
    .nav {
        height: 70px;
    }

    .nav-left {
        margin-left: 15px;
    }

    .nav-left span {
        font-size: 18px;
        margin-left: 10px;
    }

    .logo {
        height: 50px;
    }

    .nav-right {
        margin-right: 15px;
        gap: 15px;
    }

    .nav-link {
        display: none;
    }

    .download-btn {
        padding: 8px 20px;
        font-size: 14px;
    }

    .hero {
        padding: 50px 20px;
    }

    .hero-title {
        font-size: 28px;
    }

    .hero-subtitle {
        font-size: 16px;
        margin-bottom: 30px;
    }

    .hero-download-btn {
        padding: 12px 32px;
        font-size: 16px;
    }

    .features {
        padding: 50px 20px;
    }

    .features-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 15px;
    }

    .feature-card {
        padding: 20px 15px;
    }

    .feature-icon {
        width: 60px;
        height: 60px;
        font-size: 36px;
    }

    .feature-card h3 {
        font-size: 16px;
    }

    .feature-card p {
        font-size: 12px;
    }

    .section-title {
        font-size: 26px;
    }

    .section-subtitle {
        font-size: 14px;
        margin-bottom: 30px;
    }

    .content {
        padding: 50px 20px;
    }

    .screenshots {
        gap: 20px;
    }

    .screenshots img {
        height: 450px;
    }

    .target-audience {
        padding: 50px 20px;
    }

    .audience-main h3 {
        font-size: 22px;
    }

    .audience-text {
        font-size: 14px;
        padding: 0 10px;
    }

    .audience-cards {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .audience-card {
        padding: 25px 20px;
    }

    .audience-highlight {
        padding: 25px 20px;
        gap: 20px;
    }

    .highlight-label {
        font-size: 12px;
    }

    .highlight-value {
        font-size: 15px;
    }

    .foot {
        height: auto;
        padding: 20px 15px;
    }

    .foot span {
        font-size: 10px;
        line-height: 1.6;
        text-align: center;
    }
}

@media screen and (max-width: 480px) {
    .nav-left span {
        font-size: 16px;
    }

    .logo {
        height: 45px;
    }

    .download-btn {
        padding: 6px 16px;
        font-size: 12px;
    }

    .hero-title {
        font-size: 24px;
    }

    .hero-subtitle {
        font-size: 14px;
    }

    .hero-download-btn {
        padding: 10px 28px;
        font-size: 14px;
    }

    .features-grid {
        grid-template-columns: 1fr;
        gap: 15px;
    }

    .feature-card {
        padding: 25px 20px;
    }

    .feature-icon {
        width: 70px;
        height: 70px;
        font-size: 40px;
    }

    .feature-card h3 {
        font-size: 18px;
    }

    .feature-card p {
        font-size: 14px;
    }

    .section-title {
        font-size: 24px;
    }

    .screenshots {
        flex-direction: column;
    }

    .screenshots img {
        height: auto;
        max-width: 100%;
        width: 280px;
    }
}