/* ============================================
   lovemo AI虚拟伴侣下载站 - 样式文件
   ============================================ */

/* CSS 变量定义 */
:root {
    /* 主色调 */
    --primary-gradient: linear-gradient(135deg, #FF6B9D 0%, #C44569 100%);
    --primary-color: #FF6B9D;
    --secondary-color: #C44569;

    /* 辅助色 */
    --accent-color: #FF9A44;
    --background-light: #F8F4FF;
    --white: #FFFFFF;
    --text-primary: #333333;
    --text-secondary: #666666;
    --text-muted: #999999;

    /* 阴影 */
    --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
    --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
    --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.16);

    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 48px;
    --spacing-xl: 80px;

    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
}

/* 基础样式重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB',
                 'Microsoft YaHei', 'Helvetica Neue', Helvetica, Arial, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-light);
    padding-top: 0;
}

/* 容器 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-md);
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-sm);
    transition: all 0.3s ease;
}

.navbar .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding-top: var(--spacing-sm);
    padding-bottom: var(--spacing-sm);
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
    text-decoration: none;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    transition: transform 0.3s ease;
}

.nav-logo:hover {
    transform: scale(1.05);
}

.logo-icon {
    height: 32px;
    width: auto;
    display: block;
}

.logo-text {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.nav-link {
    text-decoration: none;
    color: var(--text-primary);
    font-weight: 500;
    padding: var(--spacing-xs) var(--spacing-sm);
    border-radius: var(--radius-sm);
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: all 0.3s ease;
    transform: translateX(-50%);
}

.nav-link:hover {
    color: var(--primary-color);
}

.nav-link:hover::after {
    width: 80%;
}

.nav-download-btn {
    background: var(--primary-gradient);
    color: var(--white) !important;
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: var(--radius-md);
    font-weight: 600;
    box-shadow: var(--shadow-sm);
}

.nav-download-btn::after {
    display: none;
}

.nav-download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.nav-toggle {
    display: none;
    background: none;
    border: none;
    cursor: pointer;
    padding: var(--spacing-xs);
}

.hamburger {
    display: block;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    position: relative;
    transition: background 0.3s ease;
}

.hamburger::before,
.hamburger::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: all 0.3s ease;
}

.hamburger::before {
    top: -7px;
}

.hamburger::after {
    top: 7px;
}

/* 汉堡菜单激活状态 */
.nav-toggle.active .hamburger {
    background: transparent;
}

.nav-toggle.active .hamburger::before {
    top: 0;
    transform: rotate(45deg);
}

.nav-toggle.active .hamburger::after {
    top: 0;
    transform: rotate(-45deg);
}

/* Hero 横幅 */
.hero {
    background: var(--primary-gradient);
    color: var(--white);
    padding: calc(var(--spacing-xl) + 60px) 0 var(--spacing-xl);
    min-height: 80vh;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 800"><circle cx="200" cy="400" r="300" fill="rgba(255,255,255,0.1)"/><circle cx="1000" cy="200" r="400" fill="rgba(255,255,255,0.05)"/></svg>');
    opacity: 0.3;
}

.hero-content {
    position: relative;
    z-index: 1;
    text-align: center;
    animation: fadeInUp 1s ease-out;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.2);
}

.hero-subtitle {
    font-size: 1.8rem;
    font-weight: 500;
    margin-bottom: var(--spacing-xs);
    opacity: 0.95;
}

.hero-description {
    font-size: 1.2rem;
    margin-bottom: var(--spacing-lg);
    opacity: 0.9;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-lg);
}

.stat-item {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-xs);
}

.stat-label {
    display: block;
    font-size: 1rem;
    opacity: 0.9;
}

.hero-buttons {
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-lg);
    font-size: 1.1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: var(--radius-md);
    transition: all 0.3s ease;
    cursor: pointer;
    min-width: 160px;
    text-align: center;
}

.btn-primary {
    background: var(--white);
    color: var(--primary-color);
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

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

.btn-secondary:hover {
    background: var(--white);
    color: var(--primary-color);
}

/* 核心功能区域 */
.features {
    padding: var(--spacing-xl) 0;
    background: var(--white);
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.section-subtitle {
    text-align: center;
    font-size: 1.2rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
}

.feature-card {
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 107, 157, 0.1);
}

.feature-card:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-lg);
    border-color: var(--primary-color);
}

.feature-icon {
    font-size: 3rem;
    margin-bottom: var(--spacing-sm);
}

.feature-card h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.feature-card p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 快速开始 */
.quick-start {
    padding: var(--spacing-xl) 0;
    background: var(--background-light);
}

.steps-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.step-item {
    flex: 1;
    min-width: 250px;
    text-align: center;
    padding: var(--spacing-lg);
    background: var(--white);
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-sm);
}

.step-number {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    color: var(--white);
    font-size: 2rem;
    font-weight: 700;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto var(--spacing-sm);
}

.step-arrow {
    font-size: 2rem;
    color: var(--primary-color);
    font-weight: 700;
}

.step-item h3 {
    font-size: 1.3rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.step-item p {
    color: var(--text-secondary);
}

/* 用户评价 */
.reviews {
    padding: var(--spacing-xl) 0;
    background: var(--white);
}

.reviews-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: var(--spacing-md);
}

.review-card {
    background: var(--background-light);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    position: relative;
    transition: all 0.3s ease;
}

.review-card::before {
    content: '"';
    position: absolute;
    top: var(--spacing-sm);
    left: var(--spacing-sm);
    font-size: 4rem;
    color: var(--primary-color);
    opacity: 0.2;
    font-family: Georgia, serif;
}

.review-card:hover {
    transform: translateY(-4px);
    box-shadow: var(--shadow-md);
}

.review-stars {
    color: #FFD700;
    font-size: 1.2rem;
    margin-bottom: var(--spacing-xs);
}

.review-text {
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    line-height: 1.7;
    padding-left: var(--spacing-lg);
}

.review-author {
    display: flex;
    align-items: center;
    gap: var(--spacing-xs);
}

.author-name {
    font-weight: 600;
    color: var(--text-primary);
}

/* 下载区域 */
.download {
    padding: var(--spacing-xl) 0;
    background: var(--primary-gradient);
    color: var(--white);
}

.download-card {
    background: var(--white);
    color: var(--text-primary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-lg);
    max-width: 600px;
    margin: 0 auto;
    box-shadow: var(--shadow-lg);
}

.download-info {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
}

.app-icon {
    font-size: 4rem;
}

.app-details h3 {
    font-size: 1.5rem;
    margin-bottom: var(--spacing-xs);
    color: var(--text-primary);
}

.app-details p {
    margin: var(--spacing-xs) 0;
    color: var(--text-secondary);
}

.download-btn {
    display: block;
    width: 100%;
    padding: var(--spacing-md) var(--spacing-lg);
    background: var(--primary-gradient);
    color: var(--white);
    text-align: center;
    text-decoration: none;
    border-radius: var(--radius-md);
    font-size: 1.2rem;
    font-weight: 600;
    transition: all 0.3s ease;
    margin-bottom: var(--spacing-sm);
}

.download-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.download-notice {
    text-align: center;
    font-size: 0.9rem;
    color: var(--text-muted);
    margin-top: var(--spacing-sm);
}

/* 常见问题 */
.faq {
    padding: var(--spacing-xl) 0;
    background: var(--background-light);
}

.faq-list {
    max-width: 800px;
    margin: 0 auto;
}

.faq-item {
    background: var(--white);
    margin-bottom: var(--spacing-sm);
    border-radius: var(--radius-md);
    overflow: hidden;
    box-shadow: var(--shadow-sm);
}

.faq-question {
    padding: var(--spacing-md);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
}

.faq-question:hover {
    background: var(--background-light);
}

.faq-question h3 {
    font-size: 1.1rem;
    color: var(--text-primary);
}

.faq-icon {
    font-size: 1.5rem;
    color: var(--primary-color);
    font-weight: 300;
    transition: transform 0.3s ease;
}

.faq-item.active .faq-icon {
    transform: rotate(45deg);
}

.faq-answer {
    max-height: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, padding 0.3s ease;
    padding: 0 var(--spacing-md);
}

.faq-item.active .faq-answer {
    max-height: 200px;
    padding: var(--spacing-md);
}

.faq-answer p {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 页脚 */
footer {
    background: #2D2D2D;
    color: var(--white);
    padding: var(--spacing-lg) 0;
}

.copyright-notice {
    background: rgba(255, 255, 255, 0.05);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

.copyright-notice p {
    margin: var(--spacing-xs) 0;
    font-size: 0.9rem;
    opacity: 0.9;
}

.seo-keywords {
    margin-bottom: var(--spacing-md);
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
}

.seo-keywords h3 {
    margin-bottom: var(--spacing-sm);
    font-size: 1rem;
}

.keywords-list {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-xs);
}

.keywords-list a {
    display: inline-block;
    padding: var(--spacing-xs) var(--spacing-sm);
    background: rgba(255, 107, 157, 0.2);
    color: var(--white);
    text-decoration: none;
    border-radius: var(--radius-sm);
    font-size: 0.85rem;
    transition: all 0.3s ease;
}

.keywords-list a:hover {
    background: var(--primary-color);
    transform: translateY(-2px);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-md);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-bottom p {
    opacity: 0.8;
    font-size: 0.9rem;
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 导航栏响应式 */
    .nav-toggle {
        display: block;
    }

    .nav-menu {
        position: fixed;
        top: 60px;
        left: 0;
        right: 0;
        background: rgba(255, 255, 255, 0.98);
        backdrop-filter: blur(10px);
        flex-direction: column;
        padding: var(--spacing-md);
        gap: var(--spacing-sm);
        box-shadow: var(--shadow-lg);
        transform: translateY(-100%);
        opacity: 0;
        transition: all 0.3s ease;
        pointer-events: none;
    }

    .nav-menu.active {
        transform: translateY(0);
        opacity: 1;
        pointer-events: all;
    }

    .nav-link {
        display: block;
        padding: var(--spacing-sm);
        text-align: center;
        border-radius: var(--radius-md);
    }

    .nav-link:hover {
        background: var(--background-light);
    }

    .nav-download-btn {
        margin-top: var(--spacing-sm);
    }

    /* Hero 样式 */
    .hero-title {
        font-size: 2.5rem;
    }

    .hero-subtitle {
        font-size: 1.4rem;
    }

    .hero-stats {
        flex-direction: column;
        gap: var(--spacing-md);
    }

    .stat-number {
        font-size: 2rem;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .btn {
        width: 100%;
        max-width: 300px;
    }

    .section-title {
        font-size: 2rem;
    }

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

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

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

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

    .download-info {
        flex-direction: column;
        text-align: center;
    }
}

@media (min-width: 769px) and (max-width: 1024px) {
    .features-grid {
        grid-template-columns: repeat(2, 1fr);
    }

    .reviews-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (min-width: 1025px) {
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }

    .reviews-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 滚动条美化 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--background-light);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}