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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif;
    overflow-x: hidden;
}

/* 导航栏 */
.navbar {
    background-color: #F34E00;
    padding: 25px 0;
    position: relative;
    z-index: 100;
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 40px;
}

.nav-menu {
    list-style: none;
    display: flex;
    justify-content: flex-end;
    gap: 60px;
}

.nav-item {
    display: inline-block;
}

.nav-link {
    color: white;
    text-decoration: none;
    font-size: 18px;
    font-weight: 400;
    transition: opacity 0.3s;
    letter-spacing: 0.5px;
}

.nav-link:hover {
    opacity: 0.85;
}

/* Banner区域 */
.banner {
    position: relative;
    overflow: hidden;
    background: #F34E00;
}

.banner-img {
    width: 100%;
    height: auto;
    display: block;
}

.banner-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    display: flex;
    align-items: flex-end;
    justify-content: flex-start;
}

.banner-container {
    width: 100%;
    padding-bottom: 4%;
    padding-left: 5%;
}

.banner-content {
    max-width: 400px;
    text-align: left;
}

.download-btn {
    background: white;
    color: #8B7BE8;
    border: none;
    padding: 16px 70px;
    border-radius: 50px;
    font-size: 20px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
    display: block;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 0, 0, 0.3);
}

.download-desc {
    color: white;
    font-size: 15px;
    margin-top: 15px;
    letter-spacing: 0.5px;
}

/* 功能特点区域 */
.features {
    background: #FAFAFA;
    padding: 100px 20px;
}

.features-container {
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    justify-content: space-around;
    align-items: flex-start;
    gap: 80px;
}

.feature-item {
    text-align: center;
    flex: 1;
}

.feature-item img {
    width: 200px;
    height: 200px;
    object-fit: contain;
    margin-bottom: 30px;
}

.feature-item h3 {
    font-size: 26px;
    color: #333;
    font-weight: 500;
    letter-spacing: 1px;
}

/* 页脚 */
.footer {
    background: white;
    padding: 50px 20px;
    text-align: center;
    color: #999;
    font-size: 14px;
    line-height: 1.8;
}

.footer p {
    margin: 3px 0;
    letter-spacing: 0.5px;
}

/* 弹窗 */
.modal {
    display: none;
    position: fixed;
    z-index: 1000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.5);
    animation: fadeIn 0.3s;
}

.modal-content {
    background-color: white;
    margin: 15% auto;
    padding: 40px;
    border-radius: 10px;
    width: 80%;
    max-width: 400px;
    text-align: center;
    position: relative;
    animation: slideDown 0.3s;
}

.modal-content p {
    font-size: 24px;
    color: #333;
    margin: 20px 0;
}

.close {
    position: absolute;
    right: 20px;
    top: 10px;
    color: #aaa;
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: color 0.3s;
}

.close:hover {
    color: #000;
}

@keyframes fadeIn {
    from { opacity: 0; }
    to { opacity: 1; }
}

@keyframes slideDown {
    from {
        transform: translateY(-50px);
        opacity: 0;
    }
    to {
        transform: translateY(0);
        opacity: 1;
    }
}

/* 移动端适配 */
@media (max-width: 768px) {
    .navbar {
        padding: 20px 0;
    }

    .nav-container {
        padding: 0 20px;
    }

    .nav-menu {
        justify-content: center;
        gap: 30px;
    }

    .nav-link {
        font-size: 16px;
    }

    .banner-overlay {
        position: relative;
        align-items: flex-start;
    }

    .banner-container {
        padding: 30px 20px;
        justify-content: center;
    }

    .banner-content {
        text-align: center;
        max-width: 100%;
    }

    .download-btn {
        padding: 14px 55px;
        font-size: 18px;
        margin: 0 auto;
    }

    .download-desc {
        font-size: 13px;
        margin-top: 12px;
        text-align: center;
    }

    .features {
        padding: 40px 20px;
    }

    .features-container {
        flex-direction: row;
        gap: 20px;
        align-items: center;
        justify-content: center;
    }

    .feature-item {
        width: auto;
        max-width: none;
        flex: 1;
    }

    .feature-item img {
        width: 100px;
        height: 100px;
        margin-bottom: 15px;
    }

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

    .footer {
        padding: 30px 20px;
        font-size: 12px;
    }

    .modal-content {
        width: 90%;
        padding: 30px;
    }

    .modal-content p {
        font-size: 20px;
    }
}

@media (max-width: 480px) {
    .download-btn {
        padding: 12px 45px;
        font-size: 16px;
    }

    .download-desc {
        font-size: 12px;
    }

    .features-container {
        gap: 15px;
    }

    .feature-item img {
        width: 80px;
        height: 80px;
        margin-bottom: 10px;
    }

    .feature-item h3 {
        font-size: 15px;
    }
}