/**
 * 天机阁AI预测系统 - 主CSS文件
 * 整体风格：科技感、神秘东方元素
 * 性能优化：减少CSS体积，优化选择器，增强响应式体验
 */

/* 全局变量定义 - CSS变量便于统一主题管理和动态调整 */
:root {
    /* 主色调 */
    --primary-color: #00f0ff;
    --secondary-color: #ff00ff;
    
    /* 背景色 */
    --bg-primary: #0a0a0f;
    --bg-secondary: #12121e;
    
    /* 文本色 */
    --text-primary: #e6e6ff;
    --text-secondary: #a1a1ff;
    
    /* 功能色 */
    --accent-color: #ff9900;
    --success-color: #00ff99;
    --error-color: #ff4757;
    
    /* 边框与阴影 */
    --border-color: rgba(0, 240, 255, 0.3);
    --shadow-glow: 0 0 15px rgba(0, 240, 255, 0.5);
    --shadow-blue: 0 4px 20px rgba(0, 240, 255, 0.2);
    
    /* 过渡效果 */
    --transition-normal: all 0.3s ease;
    --transition-fast: all 0.15s ease;
    
    /* 间距与尺寸 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-xxl: 3rem;
    --border-radius-sm: 4px;
    --border-radius-md: 8px;
    --border-radius-lg: 15px;
    --border-radius-full: 50px;
}

/* 基础重置 - 采用现代CSS重置方案 */
*,
*::before,
*::after {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

/* 减少重绘和重排的基础样式 */
html {
    font-size: 16px;
    scroll-behavior: smooth;
    -webkit-tap-highlight-color: transparent;
}

/* 性能优化：使用will-change提前通知浏览器可能发生的变化 */
.will-change-transform {
    will-change: transform;
}

.will-change-opacity {
    will-change: opacity;
}

.will-change-scroll {
    will-change: scroll-position;
}

/* 基础样式优化 */
body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    background-image: 
        radial-gradient(circle at 10% 20%, rgba(0, 240, 255, 0.03) 0%, transparent 20%),
        radial-gradient(circle at 80% 30%, rgba(255, 0, 255, 0.04) 0%, transparent 30%),
        radial-gradient(circle at 40% 70%, rgba(0, 240, 255, 0.03) 0%, transparent 15%),
        radial-gradient(circle at 90% 90%, rgba(255, 0, 255, 0.02) 0%, transparent 25%);
    background-attachment: fixed;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 低端设备性能优化 - 移除复杂背景和动画 */
.low-performance body {
    background-image: none;
}

.low-performance .complex-animation {
    animation: none !important;
    transform: none !important;
    transition: none !important;
}

/* 网格线背景装饰 - 使用transform减少重绘 */
body::before {
    content: "";
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(rgba(0, 240, 255, 0.05) 1px, transparent 1px),
        linear-gradient(90deg, rgba(0, 240, 255, 0.05) 1px, transparent 1px);
    background-size: 30px 30px;
    pointer-events: none;
    z-index: -1;
    transform: perspective(500px) rotateX(60deg);
    transform-origin: center top;
}

.low-performance body::before {
    background-size: 60px 60px;
    transform: none;
}

/* 导航栏 - 优化滚动性能和交互体验 */
.nav-wrapper {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: var(--spacing-lg) var(--spacing-xl);
    background-color: rgba(10, 10, 15, 0.85);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
    z-index: 1000;
    border-bottom: 1px solid var(--border-color);
    transition: var(--transition-normal);
    will-change: padding, background-color;
}

.nav-wrapper.scrolled {
    padding: var(--spacing-md) var(--spacing-xl);
    background-color: rgba(10, 10, 15, 0.95);
    box-shadow: var(--shadow-blue);
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    transition: var(--transition-fast);
    text-shadow: var(--shadow-glow);
}

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

/* 导航菜单 - 桌面端 */
.nav-menu {
    display: flex;
    gap: var(--spacing-xl);
    align-items: center;
}

.nav-link {
    color: var(--text-primary);
    text-decoration: none;
    font-size: 1rem;
    font-weight: 500;
    position: relative;
    transition: var(--transition-fast);
    padding: var(--spacing-md) 0;
}

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

.nav-link::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--primary-color);
    transition: var(--transition-normal);
}

.nav-link:hover::after {
    width: 100%;
}

/* 移动端菜单切换按钮 */
.nav-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--spacing-md);
    transition: var(--transition-fast);
    z-index: 1001;
}

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

/* 英雄区域 - 优化大屏幕性能和视觉效果 */
.hero-section {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: var(--spacing-xl);
    position: relative;
    overflow: hidden;
    padding-top: 80px;
}

.hero-content {
    max-width: 800px;
    text-align: center;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: clamp(2rem, 5vw, 3.5rem);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    line-height: 1.2;
    color: var(--text-primary);
    text-shadow: 0 0 30px rgba(0, 240, 255, 0.3);
}

.hero-subtitle {
    font-size: clamp(1rem, 2vw, 1.5rem);
    margin-bottom: var(--spacing-xl);
    color: var(--text-secondary);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 按钮样式 - 性能优化：简化动画，减少重绘 */
.btn {
    display: inline-block;
    padding: var(--spacing-lg) var(--spacing-xl);
    border: none;
    border-radius: var(--border-radius-full);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: var(--transition-normal);
    text-decoration: none;
    text-align: center;
    position: relative;
    overflow: hidden;
    z-index: 1;
    will-change: transform, box-shadow;
}

.btn::before {
    content: "";
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: var(--transition-normal);
    z-index: -1;
}

.btn:hover::before {
    left: 100%;
}

.btn-primary {
    background-color: var(--primary-color);
    color: var(--bg-primary);
    box-shadow: 0 4px 20px rgba(0, 240, 255, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(0, 240, 255, 0.4);
}

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

.btn-secondary:hover {
    background-color: rgba(0, 240, 255, 0.1);
    transform: translateY(-3px);
    box-shadow: 0 6px 25px rgba(0, 240, 255, 0.3);
}

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

/* 功能区块 - 性能优化：使用CSS Grid优化布局 */
.features-section {
    padding: var(--spacing-xxl) var(--spacing-xl);
    background-color: var(--bg-secondary);
    position: relative;
}

.section-title {
    font-size: clamp(1.75rem, 4vw, 2.5rem);
    font-weight: 700;
    text-align: center;
    margin-bottom: var(--spacing-xxl);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    left: 50%;
    transform: translateX(-50%);
}

.section-title::after {
    content: "";
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--primary-color), transparent);
}

.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(280px, 100%), 1fr));
    gap: var(--spacing-xl);
    max-width: 1200px;
    margin: 0 auto;
}

.feature-card {
    background-color: rgba(18, 18, 30, 0.7);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    will-change: transform, box-shadow;
}

.feature-card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 4px;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    opacity: 0;
    transition: var(--transition-normal);
}

.feature-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 10px 30px rgba(0, 240, 255, 0.2);
}

.feature-card:hover::before {
    opacity: 1;
}

.feature-icon {
    font-size: 2.5rem;
    margin-bottom: var(--spacing-lg);
    color: var(--primary-color);
    filter: drop-shadow(0 0 10px rgba(0, 240, 255, 0.5));
}

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

.feature-description {
    color: var(--text-secondary);
}

/* 预测表单 - 性能优化：简化选择器，优化交互体验 */
.prediction-section {
    padding: var(--spacing-xxl) var(--spacing-xl);
    position: relative;
}

.form-container {
    max-width: 600px;
    margin: 0 auto;
    background-color: rgba(18, 18, 30, 0.7);
    border-radius: var(--border-radius-lg);
    padding: 2.5rem;
    border: 1px solid var(--border-color);
    box-shadow: 0 10px 30px rgba(0, 240, 255, 0.1);
}

.form-group {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.form-label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
    color: var(--text-primary);
}

.form-input,
.form-select {
    width: 100%;
    padding: var(--spacing-md) var(--spacing-md);
    background-color: rgba(10, 10, 15, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-normal);
    will-change: border-color, box-shadow;
}

.form-input:focus,
.form-select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 15px rgba(0, 240, 255, 0.3);
}

.form-select {
    appearance: none;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%2300f0ff'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 1rem center;
    background-size: 1em;
}

.submit-btn {
    width: 100%;
    padding: var(--spacing-lg);
    font-size: 1.1rem;
    font-weight: 600;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    color: var(--bg-primary);
    border: none;
    border-radius: var(--border-radius-full);
    cursor: pointer;
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    will-change: transform, box-shadow;
}

.submit-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 30px rgba(0, 240, 255, 0.4);
}

/* 结果展示 */
.results-section {
    padding: var(--spacing-xxl) var(--spacing-xl);
    background-color: var(--bg-secondary);
    position: relative;
}

.result-card {
    background-color: rgba(10, 10, 15, 0.6);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-xl);
    transition: var(--transition-normal);
    will-change: box-shadow;
}

.result-card:hover {
    box-shadow: 0 10px 30px rgba(0, 240, 255, 0.2);
}

.result-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-md);
    flex-wrap: wrap;
    gap: var(--spacing-md);
}

.result-title {
    font-size: 1.5rem;
    color: var(--primary-color);
}

.result-confidence {
    background-color: var(--success-color);
    color: var(--bg-primary);
    padding: var(--spacing-xs) var(--spacing-md);
    border-radius: 20px;
    font-weight: 600;
    font-size: 0.9rem;
}

.result-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.result-details {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
    gap: var(--spacing-md);
}

.result-detail {
    background-color: rgba(18, 18, 30, 0.8);
    padding: var(--spacing-md);
    border-radius: var(--border-radius-md);
    border-left: 3px solid var(--primary-color);
}

.result-detail label {
    display: block;
    font-size: 0.9rem;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-xs);
}

.result-detail span {
    font-size: 1.1rem;
    font-weight: 600;
    color: var(--text-primary);
}

/* 页脚 */
.footer {
    background-color: var(--bg-primary);
    padding: var(--spacing-xxl) var(--spacing-xl);
    border-top: 1px solid var(--border-color);
    position: relative;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(min(200px, 100%), 1fr));
    gap: var(--spacing-xl);
}

.footer-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
    margin-bottom: var(--spacing-md);
    display: inline-block;
}

.footer-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
}

.footer-heading {
    font-size: 1.2rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: var(--spacing-lg);
    position: relative;
    padding-bottom: var(--spacing-xs);
}

.footer-heading::after {
    content: "";
    position: absolute;
    bottom: 0;
    left: 0;
    width: 40px;
    height: 2px;
    background-color: var(--primary-color);
}

.footer-links {
    list-style: none;
}

.footer-link {
    color: var(--text-secondary);
    text-decoration: none;
    margin-bottom: var(--spacing-xs);
    display: block;
    transition: var(--transition-fast);
}

.footer-link:hover {
    color: var(--primary-color);
    transform: translateX(5px);
}

.footer-bottom {
    max-width: 1200px;
    margin: 0 auto;
    margin-top: var(--spacing-xxl);
    padding-top: var(--spacing-lg);
    border-top: 1px solid var(--border-color);
    text-align: center;
    color: var(--text-secondary);
}

/* 性能优化的动画类 - 减少复杂动画，优化关键帧 */
@keyframes float {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-20px); }
}

@keyframes pulse {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.05); }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 5px var(--primary-color); }
    50% { box-shadow: 0 0 20px var(--primary-color), 0 0 30px rgba(0, 240, 255, 0.6); }
}

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

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 滚动触发动画 - 使用IntersectionObserver优化性能 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-normal);
    will-change: opacity, transform;
}

.animate-on-scroll.animate-active {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式设计优化 - 使用媒体查询提升移动端性能 */
@media (max-width: 768px) {
    /* 移动端优化的导航菜单 */
    .nav-menu {
        position: fixed;
        top: 0;
        right: -100%;
        height: 100vh;
        width: 80%;
        max-width: 300px;
        background-color: rgba(10, 10, 15, 0.95);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: center;
        gap: var(--spacing-xl);
        transition: var(--transition-normal);
        box-shadow: -5px 0 20px rgba(0, 0, 0, 0.5);
        z-index: 999;
        will-change: right;
    }
    
    .nav-menu.active {
        right: 0;
    }
    
    .nav-toggle {
        display: block;
    }
    
    body.menu-open {
        overflow: hidden;
    }
    
    /* 移动端按钮组优化 */
    .btn-group {
        flex-direction: column;
    }
    
    /* 移动端表单容器优化 */
    .form-container {
        padding: var(--spacing-xl);
    }
    
    /* 移动端结果展示优化 */
    .result-header {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    /* 移动端字体大小优化 */
    html {
        font-size: 14px;
    }
    
    /* 移动端间距优化 */
    .features-grid,
    .result-details,
    .footer-content {
        gap: var(--spacing-lg);
    }
    
    /* 移动端功能卡片优化 */
    .feature-card {
        padding: var(--spacing-lg);
    }
}

/* 性能监控的简化样式 */
.loading-indicator {
    display: inline-block;
    width: 20px;
    height: 20px;
    border: 2px solid rgba(0, 240, 255, 0.3);
    border-radius: 50%;
    border-top-color: var(--primary-color);
    animation: spin 1s ease-in-out infinite;
}

/* 表单错误消息 */
.error-message {
    color: var(--error-color);
    font-size: 0.9rem;
    margin-top: var(--spacing-xs);
    animation: fadeIn 0.3s ease;
}

/* 简单动画类 - 为低端设备提供基础动画 */
.simple-animation {
    animation: fadeIn 0.5s ease;
}

/* 临时动画元素 - 优化动画性能 */
.temp-animation-element {
    position: fixed;
    pointer-events: none;
    z-index: 9999;
    will-change: transform, opacity;
}