/* ====================
   全局样式 - 昱环智慧科技官网
   ==================== */

/* CSS变量定义 */
:root {
    /* 主色调渐变 */
    --primary-blue: #2A5C91;
    --primary-green: #3A9E7D;
    --gradient-primary: linear-gradient(135deg, var(--primary-blue) 0%, var(--primary-green) 100%);
    --gradient-light: linear-gradient(135deg, rgba(42, 92, 145, 0.1) 0%, rgba(58, 158, 125, 0.1) 100%);
    
    /* 辅助颜色 */
    --white: #ffffff;
    --black: #000000;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --text-light: #999999;
    --border-color: #e1e5e9;
    --background-light: #f8f9fa;
    --background-dark: #1a1a1a;
    
    /* 状态颜色 */
    --success: #28a745;
    --warning: #ffc107;
    --error: #dc3545;
    --info: #17a2b8;
    
    /* 阴影 */
    --shadow-light: 0 2px 8px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 4px 16px rgba(0, 0, 0, 0.15);
    --shadow-heavy: 0 8px 32px rgba(0, 0, 0, 0.2);
    
    /* 动画时间 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 容器尺寸 */
    --container-max: 1200px;
    --container-padding: 20px;
    
    /* 字体大小 */
    --font-xs: 12px;
    --font-sm: 14px;
    --font-base: 16px;
    --font-lg: 18px;
    --font-xl: 20px;
    --font-2xl: 24px;
    --font-3xl: 32px;
    --font-4xl: 48px;
    --font-5xl: 64px;
}

/* 全局重置 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

*::before,
*::after {
    box-sizing: border-box;
}

/* 基础样式 */
html {
    font-size: 16px;
    scroll-behavior: smooth;
    line-height: 1.6;
}

body {
    font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-weight: 400;
    color: var(--text-primary);
    background-color: var(--white);
    overflow-x: hidden;
}

/* 字体设置 */
h1, h2, h3, h4, h5, h6 {
    font-family: 'Noto Serif SC', serif;
    font-weight: 700;
    line-height: 1.3;
    margin-bottom: 0.5em;
}

h1 { font-size: var(--font-5xl); }
h2 { font-size: var(--font-4xl); }
h3 { font-size: var(--font-3xl); }
h4 { font-size: var(--font-2xl); }
h5 { font-size: var(--font-xl); }
h6 { font-size: var(--font-lg); }

p {
    margin-bottom: 1em;
    line-height: 1.7;
}

a {
    color: var(--primary-blue);
    text-decoration: none;
    transition: var(--transition-fast);
}

a:hover {
    color: var(--primary-green);
}

/* 图片响应式 */
img {
    max-width: 100%;
    height: auto;
    display: block;
}

/* 列表样式 */
ul, ol {
    list-style: none;
}

/* 按钮基础样式 */
button {
    border: none;
    background: none;
    cursor: pointer;
    font-family: inherit;
    transition: var(--transition-fast);
}

/* 输入框基础样式 */
input, textarea, select {
    font-family: inherit;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    padding: 12px 16px;
    font-size: var(--font-base);
    transition: var(--transition-fast);
}

input:focus, textarea:focus, select:focus {
    outline: none;
    border-color: var(--primary-blue);
    box-shadow: 0 0 0 2px rgba(42, 92, 145, 0.2);
}

/* 容器布局 */
.container {
    max-width: var(--container-max);
    margin: 0 auto;
    padding: 0 var(--container-padding);
}

/* 导航栏样式 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    z-index: 1000;
    transition: var(--transition-normal);
}

.navbar.scrolled {
    background: var(--white);
    box-shadow: var(--shadow-light);
}

.nav-container {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 16px 20px;
    max-width: var(--container-max);
    margin: 0 auto;
}

.logo {
    display: flex;
    align-items: center;
    font-family: 'Noto Serif SC', serif;
    font-size: var(--font-2xl);
    font-weight: 700;
    letter-spacing: 2px;
    line-height: 1;
}

.logo a {
    display: inline-block;
    padding: 4px 0;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    color: transparent;
    text-decoration: none;
    transition: var(--transition-fast);
}

.logo a:hover {
    opacity: 0.85;
}

.nav-menu {
    display: flex;
    align-items: center;
    gap: 32px;
}

.nav-menu a {
    font-weight: 500;
    padding: 8px 16px;
    border-radius: 20px;
    transition: var(--transition-fast);
    position: relative;
}

.nav-menu a:hover,
.nav-menu a.active {
    background: var(--gradient-light);
    color: var(--primary-blue);
}

.nav-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    cursor: pointer;
}

.nav-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition-fast);
}

/* 响应式导航 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: var(--white);
        flex-direction: column;
        justify-content: flex-start;
        padding-top: 40px;
        transition: var(--transition-normal);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .nav-toggle {
        display: flex;
    }
    
    .nav-toggle.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }
    
    .nav-toggle.active span:nth-child(2) {
        opacity: 0;
    }
    
    .nav-toggle.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }
}

/* 按钮组件 */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: 500;
    text-decoration: none;
    cursor: pointer;
    transition: var(--transition-fast);
    border: none;
    font-size: var(--font-base);
    line-height: 1.5;
}

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

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

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

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

.btn-ghost {
    background: transparent;
    color: var(--text-primary);
}

.btn-ghost:hover {
    background: var(--gradient-light);
    color: var(--primary-blue);
}

/* 卡片组件 */
.card {
    background: var(--white);
    border-radius: 12px;
    padding: 24px;
    box-shadow: var(--shadow-light);
    transition: var(--transition-normal);
    border: 1px solid var(--border-color);
}

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

/* 网格布局 */
.grid {
    display: grid;
    gap: 24px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.grid-4 {
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
}

/* 段落标题 */
.section-title {
    text-align: center;
    margin-bottom: 48px;
    position: relative;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -16px;
    left: 50%;
    transform: translateX(-50%);
    width: 60px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

/* 页脚样式 */
.footer {
    background: var(--text-primary);
    color: var(--white);
    padding: 48px 0 24px;
    margin-top: 80px;
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 32px;
    margin-bottom: 32px;
}

.footer-section h3,
.footer-section h4 {
    margin-bottom: 16px;
    color: var(--white);
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section a {
    color: #cccccc;
    transition: var(--transition-fast);
}

.footer-section a:hover {
    color: var(--white);
}

.social-links {
    display: flex;
    gap: 16px;
    margin-top: 16px;
}

.social-link {
    padding: 8px 16px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 20px;
    transition: var(--transition-fast);
}

.social-link:hover {
    background: var(--gradient-primary);
    color: var(--white);
}

.footer-bottom {
    text-align: center;
    padding-top: 24px;
    border-top: 1px solid #333;
    color: #cccccc;
}

/* 工具类 */
.text-center { text-align: center; }
.text-left { text-align: left; }
.text-right { text-align: right; }

.mt-1 { margin-top: 8px; }
.mt-2 { margin-top: 16px; }
.mt-3 { margin-top: 24px; }
.mt-4 { margin-top: 32px; }
.mt-5 { margin-top: 48px; }

.mb-1 { margin-bottom: 8px; }
.mb-2 { margin-bottom: 16px; }
.mb-3 { margin-bottom: 24px; }
.mb-4 { margin-bottom: 32px; }
.mb-5 { margin-bottom: 48px; }

.p-1 { padding: 8px; }
.p-2 { padding: 16px; }
.p-3 { padding: 24px; }
.p-4 { padding: 32px; }
.p-5 { padding: 48px; }

/* 动画类 */
.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: var(--transition-slow);
}

.fade-in.animate {
    opacity: 1;
    transform: translateY(0);
}

.slide-in-left {
    opacity: 0;
    transform: translateX(-30px);
    transition: var(--transition-slow);
}

.slide-in-left.animate {
    opacity: 1;
    transform: translateX(0);
}

.slide-in-right {
    opacity: 0;
    transform: translateX(30px);
    transition: var(--transition-slow);
}

.slide-in-right.animate {
    opacity: 1;
    transform: translateX(0);
}

/* 滚动条样式 */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: #f1f1f1;
}

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

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

/* 平滑滚动 */
html {
    scroll-behavior: smooth;
}

/* 响应式布局 */
@media (max-width: 1200px) {
    .container {
        padding: 0 20px;
    }
}

@media (max-width: 768px) {
    :root {
        --font-4xl: 36px;
        --font-3xl: 28px;
        --font-2xl: 20px;
    }
    
    .grid-2,
    .grid-3,
    .grid-4 {
        grid-template-columns: 1fr;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        gap: 24px;
    }
}