:root {
    /* 核心色板 */
    --color-primary: #7A53E4; /* 主紫色 */
    --color-secondary: #FF85A2; /* 辅粉色 */
    --color-gradient-start: #7A53E4;
    --color-gradient-end: #C553E4;
    --color-text-dark: #333333;
    --color-text-light: #ffffff;
    --color-background-light: #f4f6fa;
    --color-background-white: #ffffff;
    --color-border: #e0e0e0;

    /* 字体 */
    --font-family-primary: 'Helvetica Neue', Helvetica, Arial, sans-serif;
    --font-size-base: 16px;
}

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

body {
    font-family: var(--font-family-primary);
    line-height: 1.6;
    color: var(--color-text-dark);
    background-color: var(--color-background-white);
}

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

a {
    text-decoration: none;
    color: var(--color-primary);
    transition: color 0.3s;
}

a:hover {
    color: var(--color-gradient-end);
}

/* 按钮样式 */
.button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 30px;
    border-radius: 50px;
    font-weight: bold;
    font-size: var(--font-size-base);
    cursor: pointer;
    transition: all 0.3s ease;
    border: none;
}

.primary-button {
    background-image: linear-gradient(to right, var(--color-gradient-start), var(--color-gradient-end));
    color: var(--color-text-light);
    box-shadow: 0 4px 15px rgba(122, 83, 228, 0.4);
}

.primary-button:hover {
    box-shadow: 0 6px 20px rgba(122, 83, 228, 0.6);
    transform: translateY(-2px);
}

.secondary-button {
    background-color: var(--color-background-white);
    color: var(--color-primary);
    border: 2px solid var(--color-primary);
}

.secondary-button:hover {
    background-color: var(--color-primary);
    color: var(--color-text-light);
}

.large-button {
    padding: 15px 40px;
    font-size: 1.1em;
}

/* --- Header 导航栏 --- */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 40px;
    background-color: var(--color-background-white);
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
    position: sticky;
    top: 0;
    z-index: 1000;
}

header .logo {
    font-size: 1.8em;
    font-weight: 900;
    background-image: linear-gradient(to right, var(--color-gradient-start), var(--color-secondary));
    -webkit-background-clip: text;
    color: transparent;
}

header nav a {
    margin-left: 30px;
    color: var(--color-text-dark);
    font-weight: 500;
}

header nav a.nav-button {
    padding: 8px 20px;
    background-image: linear-gradient(to right, var(--color-secondary), var(--color-gradient-end));
    color: var(--color-text-light);
    border-radius: 20px;
    margin-left: 40px;
}

.menu-toggle {
    display: none;
    background: none;
    border: none;
    font-size: 1.8em;
    color: var(--color-primary);
}

/* --- Hero Section 英雄区域 --- */
.hero {
    background-image: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-secondary) 100%);
    padding: 80px 0;
    color: var(--color-text-light);
}

.hero2 {
    background-image: linear-gradient(135deg, var(--color-gradient-start) 0%, var(--color-secondary) 100%);
    color: var(--color-text-light);
}

.hero .container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    min-height: 70vh;
}

.hero-content {
    max-width: 50%;
}

.hero-content .logo-text {
    font-size: 2.5em;
    font-weight: 900;
    margin-bottom: 10px;
}

.hero-content h1 {
    font-size: 3.5em;
    margin-bottom: 20px;
    line-height: 1.2;
}

.hero-content p {
    font-size: 1.2em;
    margin-bottom: 30px;
    opacity: 0.8;
}

.hero-image {
    max-width: 45%;
    position: relative;
}

.hero-image img {
    width: 100%;
    height: auto;
    border-radius: 20px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

/* --- Features Section 功能特色区域 --- */
.features-section, .reviews-section {
    padding: 80px 0;
    text-align: center;
}

h2 {
    font-size: 2.5em;
    margin-bottom: 50px;
    font-weight: 800;
    color: var(--color-text-dark);
}

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

.feature-card {
    background-color: var(--color-background-light);
    padding: 30px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    transition: transform 0.3s;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(122, 83, 228, 0.1);
}

.feature-card .icon-bg {
    display: inline-block;
    background-image: linear-gradient(45deg, var(--color-primary), var(--color-secondary));
    color: var(--color-text-light);
    font-size: 2em;
    padding: 15px;
    border-radius: 50%;
    margin-bottom: 15px;
}

.feature-card h3 {
    font-size: 1.5em;
    margin-bottom: 10px;
    font-weight: 700;
}

/* --- Reviews Section 用户评价区域 --- */
.reviews-section {
    background-color: var(--color-background-light);
}

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

.review-card {
    background-color: var(--color-background-white);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.05);
    text-align: center;
}

.review-card img {
    width: 80px;
    height: 80px;
    border-radius: 50%;
    object-fit: cover;
    margin-bottom: 20px;
    border: 3px solid var(--color-secondary);
}

.review-card p {
    font-style: italic;
    font-size: 1.1em;
    color: var(--color-text-dark);
}

/* --- Download Section 下载区域 --- */
.download-section {
    background-image: linear-gradient(to right, var(--color-gradient-start), var(--color-gradient-end));
    color: var(--color-text-light);
    padding: 80px 0;
    text-align: center;
}

.download-section h2 {
    color: var(--color-text-light);
    margin-bottom: 40px;
}

.download-buttons {
    display: flex;
    justify-content: center;
    gap: 30px;
}

.download-buttons .button {
    min-width: 250px;
}

/* --- Footer 底部导航 --- */
footer {
    padding: 40px 0;
    background-color: var(--color-text-dark);
    color: var(--color-border);
    text-align: center;
}

.footer-links a {
    color: var(--color-border);
    margin: 0 15px;
    font-size: 0.9em;
    transition: color 0.3s;
}

.footer-links a:hover {
    color: var(--color-secondary);
}

.copyright {
    margin-top: 20px;
    font-size: 0.8em;
    opacity: 0.7;
}

/* --- 响应式设计 (Responsive Design) --- */
@media (max-width: 992px) {
    .hero .container {
        flex-direction: column;
        text-align: center;
        min-height: auto;
    }

    .hero-content, .hero-image {
        max-width: 100%;
    }

    .hero-image {
        margin-top: 50px;
    }

    .hero-content h1 {
        font-size: 2.5em;
    }

    .feature-grid, .review-grid {
        grid-template-columns: 1fr 1fr;
    }

    .download-buttons {
        flex-direction: column;
        gap: 20px;
        align-items: center;
    }

    .download-buttons .button {
        width: 80%;
    }
}

@media (max-width: 768px) {
    header nav {
        display: none; /* 默认隐藏导航 */
        flex-direction: column;
        position: absolute;
        top: 60px;
        right: 0;
        width: 100%;
        background-color: var(--color-background-white);
        padding: 20px;
        box-shadow: 0 5px 10px rgba(0, 0, 0, 0.1);
    }
    
    header nav a {
        margin: 10px 0;
        text-align: center;
        padding: 10px;
        border-bottom: 1px solid var(--color-border);
    }

    header nav a.nav-button {
        margin: 20px auto 0 auto;
        width: 80%;
    }

    .menu-toggle {
        display: block; /* 显示菜单按钮 */
    }

    .hero {
        padding: 50px 0;
    }

    .hero-content h1 {
        font-size: 2em;
    }

    .feature-grid, .review-grid {
        grid-template-columns: 1fr;
    }

    .features-section, .reviews-section, .download-section {
        padding: 50px 0;
    }
}