:root {
    --primary-green: #00c853;
    --secondary-green: #69f0ae;
    --bg-gradient-start: #e8f5e9;
    --bg-gradient-end: #ffffff;
    --text-dark: #333333;
    --text-gray: #666666;
    --white: #ffffff;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

body {
    background: linear-gradient(180deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    min-height: 100vh;
    color: var(--text-dark);
    overflow-x: hidden;
}

.header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 1.5rem;
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo-icon {
    width: 32px;
    height: 32px;
    background-color: var(--primary-green);
    color: white;
    border-radius: 8px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 1.2rem;
}

.logo-text {
    font-size: 1.2rem;
    font-weight: bold;
    color: var(--primary-green);
}

.menu-icon {
    width: 24px;
    height: 18px;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
    cursor: pointer;
}

.menu-icon span {
    display: block;
    width: 100%;
    height: 2px;
    background-color: var(--text-dark);
    border-radius: 2px;
}

.hero-section {
    position: relative;
    padding: 2rem 1.5rem;
    max-width: 1200px;
    margin: 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.bg-decoration {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 200, 83, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 90% 50%, rgba(105, 240, 174, 0.1) 0%, transparent 50%);
}

.content-wrapper {
    margin-bottom: 3rem;
    width: 100%;
    max-width: 600px;
}

.main-title {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--text-dark);
}

.sub-title {
    font-size: 1.2rem;
    margin-bottom: 1.5rem;
    font-weight: normal;
}

.highlight {
    background-color: var(--primary-green);
    color: white;
    padding: 0.2rem 0.5rem;
    border-radius: 4px;
    font-weight: bold;
}

.description {
    font-size: 0.95rem;
    line-height: 1.6;
    color: var(--text-gray);
    margin-bottom: 2rem;
    text-align: justify;
}

.btn-group {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

.download-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.8rem 2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: bold;
    transition: transform 0.2s, box-shadow 0.2s;
    min-width: 160px;
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 5px 15px rgba(0, 200, 83, 0.3);
}

.android-btn, .wechat-btn {
    background-color: var(--primary-green);
    color: white;
}

.icon {
    width: 24px;
    height: 24px;
}

.phone-mockup-container {
    position: relative;
    width: 100%;
    max-width: 320px;
    margin: 0 auto;
    perspective: 1000px;
}

.phone-mockup {
    background-color: #1a1a1a;
    border-radius: 40px;
    padding: 10px;
    box-shadow: 0 20px 50px rgba(0,0,0,0.2);
    position: relative;
    overflow: hidden;
    border: 4px solid #333;
}

.phone-notch {
    position: absolute;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 120px;
    height: 25px;
    background-color: #1a1a1a;
    border-bottom-left-radius: 15px;
    border-bottom-right-radius: 15px;
    z-index: 10;
}

.phone-screen {
    background-color: #f5f5f5;
    border-radius: 32px;
    height: 600px;
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

.app-header {
    height: 80px;
    background-color: #e8f5e9;
    display: flex;
    align-items: flex-end;
    justify-content: space-around;
    padding-bottom: 10px;
    font-size: 0.9rem;
    font-weight: bold;
    color: var(--text-dark);
}

.app-banner {
    height: 150px;
    background: linear-gradient(45deg, #a5d6a7, #81c784);
    margin: 15px;
    border-radius: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.banner-text {
    color: white;
    font-weight: bold;
    font-size: 1.2rem;
}

.app-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 15px;
    padding: 0 15px;
}

.app-card {
    background: white;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 2px 5px rgba(0,0,0,0.05);
    height: 180px;
    display: flex;
    flex-direction: column;
}

.card-img {
    height: 120px;
    width: 100%;
    background-size: cover;
    background-position: center;
}

.card-text {
    padding: 8px;
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.card-title {
    font-size: 0.8rem;
    font-weight: bold;
    color: var(--text-dark);
}

.card-price {
    font-size: 0.9rem;
    color: #e53935;
    font-weight: bold;
}

.footer {
    text-align: center;
    padding: 2rem;
    color: var(--text-gray);
    font-size: 0.8rem;
    background-color: #f9f9f9;
    margin-top: 2rem;
}

@media (min-width: 768px) {
    .hero-section {
        flex-direction: row;
        justify-content: space-between;
        text-align: left;
        align-items: center;
        padding: 4rem 2rem;
    }

    .content-wrapper {
        margin-bottom: 0;
        padding-right: 2rem;
    }

    .description {
        text-align: left;
    }

    .btn-group {
        justify-content: flex-start;
    }

    .main-title {
        font-size: 4rem;
    }

    .sub-title {
        font-size: 1.8rem;
    }
}