/* ==========================================
   RandomGen Technical Support - Styles
   深色模式 | 紫色渐变主题 | 玻璃拟态设计
   ========================================== */

:root {
    /* 主色调 - 紫色系 */
    --primary: #9333EA;
    --primary-dark: #7C3AED;
    --primary-light: #C026D3;
    --accent: #AD8AEB;
    
    /* 背景渐变 - 深色模式 */
    --bg-gradient-start: #1E1B4B;
    --bg-gradient-end: #4C1D95;
    
    /* 玻璃拟态 */
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --glass-shadow: rgba(0, 0, 0, 0.3);
    
    /* 文字颜色 */
    --text-primary: #FFFFFF;
    --text-secondary: rgba(255, 255, 255, 0.7);
    --text-tertiary: rgba(255, 255, 255, 0.5);
    
    /* 圆角 */
    --radius-sm: 12px;
    --radius-md: 16px;
    --radius-lg: 20px;
    --radius-xl: 24px;
    
    /* 间距 */
    --spacing-xs: 4px;
    --spacing-sm: 8px;
    --spacing-md: 16px;
    --spacing-lg: 24px;
    --spacing-xl: 32px;
    --spacing-xxl: 48px;
}

/* ==========================================
   全局样式
   ========================================== */

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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, var(--bg-gradient-start) 0%, var(--bg-gradient-end) 100%);
    background-attachment: fixed;
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    position: relative;
    overflow-x: hidden;
}

/* 背景装饰圆形 */
body::before,
body::after {
    content: '';
    position: fixed;
    border-radius: 50%;
    opacity: 0.05;
    pointer-events: none;
    z-index: 0;
}

body::before {
    width: 300px;
    height: 300px;
    background: var(--primary);
    top: -100px;
    right: 10%;
    filter: blur(60px);
}

body::after {
    width: 250px;
    height: 250px;
    background: var(--primary-light);
    bottom: 100px;
    left: -50px;
    filter: blur(60px);
}

/* ==========================================
   语言选择器
   ========================================== */

.language-selector {
    position: fixed;
    top: var(--spacing-lg);
    right: var(--spacing-lg);
    display: flex;
    gap: var(--spacing-sm);
    z-index: 1000;
    background: var(--glass-bg);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-sm);
}

.language-selector button {
    background: transparent;
    border: 1px solid var(--glass-border);
    color: var(--text-secondary);
    padding: var(--spacing-sm) var(--spacing-md);
    border-radius: var(--radius-sm);
    cursor: pointer;
    font-size: 14px;
    transition: all 0.3s ease;
}

.language-selector button:hover {
    background: var(--glass-bg);
    color: var(--text-primary);
    border-color: var(--primary);
}

.language-selector button.active {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent) 100%);
    color: var(--text-primary);
    border-color: transparent;
}

/* 移动端适配 */
@media (max-width: 768px) {
    .language-selector {
        top: var(--spacing-md);
        right: var(--spacing-md);
        flex-wrap: wrap;
        max-width: calc(100% - var(--spacing-md) * 2);
    }
    
    .language-selector button {
        padding: 6px 12px;
        font-size: 12px;
    }
}

/* ==========================================
   头部区域
   ========================================== */

.header {
    text-align: center;
    padding: calc(var(--spacing-xxl) + 60px) var(--spacing-lg) var(--spacing-xxl);
    position: relative;
    z-index: 1;
}

.app-icon {
    margin: 0 auto var(--spacing-lg);
}

.icon-placeholder {
    width: 100px;
    height: 100px;
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent) 100%);
    border-radius: 22px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 36px;
    font-weight: bold;
    color: white;
    margin: 0 auto;
    box-shadow: 0 10px 30px var(--glass-shadow);
}

.app-name {
    font-size: 48px;
    font-weight: bold;
    margin-bottom: var(--spacing-sm);
    background: linear-gradient(135deg, var(--primary-light) 0%, var(--accent) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.app-tagline {
    font-size: 18px;
    color: var(--text-secondary);
}

@media (max-width: 768px) {
    .header {
        padding: calc(var(--spacing-xl) + 50px) var(--spacing-md) var(--spacing-xl);
    }
    
    .icon-placeholder {
        width: 80px;
        height: 80px;
        font-size: 28px;
        border-radius: 18px;
    }
    
    .app-name {
        font-size: 36px;
    }
    
    .app-tagline {
        font-size: 16px;
    }
}

/* ==========================================
   容器
   ========================================== */

.container {
    max-width: 900px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg) var(--spacing-xxl);
    position: relative;
    z-index: 1;
}

@media (max-width: 768px) {
    .container {
        padding: 0 var(--spacing-md) var(--spacing-xl);
    }
}

/* ==========================================
   玻璃拟态卡片
   ========================================== */

.glass-card {
    background: var(--glass-bg);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
    box-shadow: 0 10px 30px var(--glass-shadow);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.glass-card:hover {
    transform: translateY(-2px);
    box-shadow: 0 15px 40px var(--glass-shadow);
}

.glass-card h2 {
    font-size: 28px;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    position: relative;
    padding-bottom: var(--spacing-md);
}

.glass-card h2::after {
    content: '';
    position: absolute;
    left: 0;
    bottom: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(90deg, var(--primary) 0%, var(--accent) 100%);
    border-radius: 2px;
}

@media (max-width: 768px) {
    .glass-card {
        padding: var(--spacing-lg);
    }
    
    .glass-card h2 {
        font-size: 24px;
    }
}

/* ==========================================
   功能网格
   ========================================== */

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.feature-item {
    text-align: center;
    padding: var(--spacing-lg);
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: all 0.3s ease;
}

.feature-item:hover {
    background: rgba(255, 255, 255, 0.08);
    border-color: var(--primary);
    transform: translateY(-4px);
}

.feature-icon {
    font-size: 48px;
    display: block;
    margin-bottom: var(--spacing-md);
}

.feature-item h3 {
    font-size: 20px;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.feature-item p {
    font-size: 14px;
    color: var(--text-secondary);
    line-height: 1.5;
}

@media (max-width: 768px) {
    .features-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-md);
    }
}

/* ==========================================
   FAQ 区域
   ========================================== */

.faq-item {
    margin-bottom: var(--spacing-lg);
    padding-bottom: var(--spacing-lg);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.faq-item:last-child {
    border-bottom: none;
    margin-bottom: 0;
    padding-bottom: 0;
}

.faq-item h3 {
    font-size: 18px;
    margin-bottom: var(--spacing-sm);
    color: var(--primary-light);
}

.faq-item p {
    font-size: 15px;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* ==========================================
   联系信息
   ========================================== */

.contact-info {
    margin-top: var(--spacing-lg);
}

.contact-item {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
    margin-bottom: var(--spacing-md);
    font-size: 16px;
}

.contact-icon {
    font-size: 24px;
}

.contact-item a {
    color: var(--primary-light);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-item a:hover {
    color: var(--accent);
    text-decoration: underline;
}

/* ==========================================
   法律链接
   ========================================== */

.legal-links {
    display: flex;
    gap: var(--spacing-lg);
    margin-top: var(--spacing-lg);
}

.legal-link {
    flex: 1;
    display: block;
    text-align: center;
    padding: var(--spacing-md);
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
}

.legal-link:hover {
    background: linear-gradient(135deg, var(--primary-dark) 0%, var(--accent) 100%);
    border-color: transparent;
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .legal-links {
        flex-direction: column;
        gap: var(--spacing-md);
    }
}

/* ==========================================
   页脚
   ========================================== */

.footer {
    text-align: center;
    padding: var(--spacing-xl) var(--spacing-lg);
    color: var(--text-tertiary);
    font-size: 14px;
    position: relative;
    z-index: 1;
}

.footer p {
    margin-bottom: var(--spacing-sm);
}

.footer-note {
    font-size: 13px;
    opacity: 0.7;
}

/* ==========================================
   动画
   ========================================== */

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.glass-card {
    animation: fadeIn 0.6s ease-out;
}

.glass-card:nth-child(1) { animation-delay: 0.1s; }
.glass-card:nth-child(2) { animation-delay: 0.2s; }
.glass-card:nth-child(3) { animation-delay: 0.3s; }
.glass-card:nth-child(4) { animation-delay: 0.4s; }
.glass-card:nth-child(5) { animation-delay: 0.5s; }

/* ==========================================
   滚动条样式
   ========================================== */

::-webkit-scrollbar {
    width: 10px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.2);
}

::-webkit-scrollbar-thumb {
    background: var(--primary);
    border-radius: 5px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--primary-light);
}

.app-icon-image {
    width: 100px;
    height: 100px;
    border-radius: 22px;
    object-fit: cover; /* 保持图片比例，裁剪多余部分 */
    box-shadow: 0 10px 30px var(--glass-shadow);
    display: block;
    margin: 0 auto;
}

@media (max-width: 768px) {
    .app-icon-image {
        width: 80px;
        height: 80px;
        border-radius: 18px;
    }
}