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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    color: #333;
    line-height: 1.6;
    overflow-x: hidden;
}

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

/* Header */
.header {
    background: #fff;
    padding: 20px 0;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

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

.logo-area {
    display: flex;
    align-items: center;
    gap: 12px;
}

.logo-placeholder {
    width: 50px;
    height: 50px;
    background: #f5f5f5;
    border-radius: 4px;
}

.logo-img {
    width: 50px;
    height: 50px;
    object-fit: contain;
    border-radius: 4px;
}

.logo-text {
    font-size: 24px;
    font-weight: bold;
    color: #333;
}

.nav {
    display: flex;
    gap: 30px;
}

.nav-link {
    color: #333;
    text-decoration: none;
    font-size: 16px;
    transition: color 0.3s;
}

.nav-link:hover {
    color: #ffc107;
}

/* Hero Section */
.hero {
    background: linear-gradient(to right, #fff9e6 0%, #ffffff 60%);
    padding: 80px 0 100px;
    min-height: 600px;
    display: flex;
    align-items: center;
}

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

.hero-content {
    flex: 1;
    max-width: 600px;
}

.hero-title {
    margin-bottom: 30px;
}

.title-main {
    display: block;
    font-size: 64px;
    font-weight: bold;
    color: #333;
    margin-bottom: 15px;
}

.title-sub {
    display: inline-block;
    font-size: 36px;
    font-weight: 500;
    color: #333;
    position: relative;
    padding-bottom: 10px;
}

.title-sub::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 8px;
    background: linear-gradient(to right, #ffc107, #ffd54f);
    border-radius: 4px;
}

.hero-description {
    font-size: 16px;
    color: #666;
    line-height: 1.8;
    margin-bottom: 40px;
}

.download-btn {
    background: #ffc107;
    color: #333;
    border: none;
    padding: 16px 40px;
    font-size: 18px;
    font-weight: bold;
    border-radius: 8px;
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    transition: transform 0.3s, box-shadow 0.3s;
    box-shadow: 0 4px 12px rgba(255, 193, 7, 0.3);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(255, 193, 7, 0.4);
}

.download-btn span {
    font-size: 20px;
}

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

.ball-3d {
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: linear-gradient(135deg, #e1bee7 0%, #ce93d8 50%, #ba68c8 100%);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 120px;
    font-weight: bold;
    color: #fff;
    box-shadow: 
        0 20px 60px rgba(186, 104, 200, 0.4),
        inset -20px -20px 40px rgba(0, 0, 0, 0.2),
        inset 20px 20px 40px rgba(255, 255, 255, 0.3);
    transform: perspective(1000px) rotateY(-15deg) rotateX(10deg);
    animation: float 3s ease-in-out infinite;
}

@keyframes float {
    0%, 100% {
        transform: perspective(1000px) rotateY(-15deg) rotateX(10deg) translateY(0);
    }
    50% {
        transform: perspective(1000px) rotateY(-15deg) rotateX(10deg) translateY(-20px);
    }
}

/* Why Choose Us Section */
.why-choose-us {
    background: #fff9e6;
    padding: 80px 0;
}

.section-title {
    font-size: 48px;
    font-weight: bold;
    text-align: center;
    color: #333;
    margin-bottom: 40px;
}

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

.why-text {
    font-size: 18px;
    color: #555;
    line-height: 1.9;
    text-align: left;
}

/* Core Services Section */
.core-services {
    background: #fff;
    padding: 80px 0;
}

.section-subtitle {
    text-align: center;
    font-size: 20px;
    color: #666;
    margin-bottom: 60px;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    margin-top: 40px;
}

.service-card {
    background: #fff9e6;
    border: 2px solid #fff;
    border-radius: 12px;
    padding: 40px 30px;
    transition: transform 0.3s, box-shadow 0.3s;
}

.service-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

.service-title {
    font-size: 24px;
    font-weight: bold;
    color: #333;
    margin-bottom: 20px;
}

.service-text {
    font-size: 16px;
    color: #555;
    line-height: 1.8;
}

/* How to Use Section */
.how-to-use {
    background: #fff9e6;
    padding: 80px 0;
}

.steps-container {
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
    gap: 20px;
    margin-top: 60px;
}

.step-box {
    background: #fff;
    border-radius: 12px;
    padding: 30px 25px;
    width: 220px;
    text-align: center;
    box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
}

.step-number {
    width: 50px;
    height: 50px;
    background: #ffc107;
    color: #333;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    font-weight: bold;
    margin: 0 auto 15px;
}

.step-text {
    font-size: 15px;
    color: #555;
    line-height: 1.6;
}

.arrow-icon {
    font-size: 32px;
    color: #ffc107;
    font-weight: bold;
}

/* About Us Section */
.about-us {
    background: #fff;
    padding: 80px 0;
}

.about-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 60px;
    margin-top: 40px;
}

.about-text {
    flex: 1;
}

.about-text p {
    font-size: 18px;
    color: #555;
    line-height: 1.9;
}

.about-image-placeholder {
    flex: 1;
    height: 400px;
    background: linear-gradient(135deg, #fce4ec 0%, #f8bbd0 100%);
    border-radius: 12px;
    max-width: 200px;
}

.about-images {
    flex: 1;
    display: flex;
    gap: 20px;
    align-items: center;
    justify-content: center;
}

.about-image {
    width: 200px;
    height: auto;
    border-radius: 12px;
    object-fit: contain;
}

/* Footer */
.footer {
    background: #f5f5f5;
    padding: 60px 0 40px;
}

.footer .container {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 30px;
}

.footer-download {
    margin: 0 auto;
}

.footer-info {
    text-align: center;
    color: #666;
    font-size: 14px;
    line-height: 2;
}

.footer-info p {
    margin: 5px 0;
}

/* Responsive Design */
@media (max-width: 768px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
    }

    .hero-image {
        margin-top: 40px;
    }

    .ball-3d {
        width: 200px;
        height: 200px;
        font-size: 80px;
    }

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

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

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

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

    .steps-container {
        flex-direction: column;
    }

    .arrow-icon {
        transform: rotate(90deg);
    }

    .about-content {
        flex-direction: column;
    }

    .about-image-placeholder {
        width: 100%;
        max-width: 100%;
    }

    .about-images {
        flex-direction: column;
        width: 100%;
    }

    .about-image {
        width: 100%;
        max-width: 200px;
    }

    .nav {
        gap: 15px;
    }

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

@media (max-width: 480px) {
    .title-main {
        font-size: 32px;
    }

    .title-sub {
        font-size: 20px;
    }

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

    .hero {
        padding: 40px 0 60px;
    }

    .step-box {
        width: 100%;
    }
}