/* 仟流科技 - 公司项目展示网站主样式 */

/* CSS变量定义 */
:root {
    /* 主色调 */
    --primary-color: #00d2ff;
    --secondary-color: #3a7bd5;
    --accent-color: #667eea;
    
    /* 背景色 */
    --bg-dark: #1a1a1a;
    --bg-darker: #0f0f0f;
    --bg-light: rgba(255, 255, 255, 0.08);
    --bg-lighter: rgba(255, 255, 255, 0.12);
    
    /* 文字颜色 */
    --text-primary: #ffffff;
    --text-secondary: rgba(255, 255, 255, 0.9);
    --text-muted: rgba(255, 255, 255, 0.6);
    
    /* 边框和阴影 */
    --border-color: rgba(255, 255, 255, 0.15);
    --shadow-light: 0 4px 20px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 8px 30px rgba(0, 0, 0, 0.2);
    --shadow-heavy: 0 15px 50px rgba(0, 0, 0, 0.3);
    
    /* 间距 */
    --spacing-xs: 8px;
    --spacing-sm: 16px;
    --spacing-md: 24px;
    --spacing-lg: 32px;
    --spacing-xl: 48px;
    --spacing-xxl: 64px;
    
    /* 圆角 */
    --radius-sm: 8px;
    --radius-md: 12px;
    --radius-lg: 16px;
    --radius-xl: 24px;
    
    /* 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;
}

/* 仟流科技网站样式 - 限定在#qianliu下 */
#qianliu {
    /* 基础重置 */
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'PingFang SC', 'Hiragino Sans GB', 'Helvetica Neue', Arial, sans-serif;
    background: var(--bg-dark);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
}

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

#qianliu html {
    scroll-behavior: smooth;
    font-size: 16px;
}

/* 动态背景效果 */
#qianliu .background-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
}

#qianliu .background-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 200%;
    height: 200%;
    background:
        radial-gradient(circle at 20% 80%, rgba(120, 200, 255, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(255, 120, 200, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 255, 200, 0.1) 0%, transparent 50%);
    animation: backgroundMove 20s ease-in-out infinite;
}

#qianliu .background-animation::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background:
        linear-gradient(45deg, transparent 40%, rgba(0, 210, 255, 0.03) 50%, transparent 60%),
        linear-gradient(-45deg, transparent 40%, rgba(255, 120, 200, 0.03) 50%, transparent 60%);
    animation: overlayMove 15s ease-in-out infinite reverse;
}

@keyframes backgroundMove {
    0%, 100% { transform: translateX(0) translateY(0) rotate(0deg); }
    33% { transform: translateX(-20px) translateY(-20px) rotate(1deg); }
    66% { transform: translateX(20px) translateY(-10px) rotate(-1deg); }
}

@keyframes overlayMove {
    0%, 100% { transform: translateX(0) translateY(0) scale(1); }
    50% { transform: translateX(10px) translateY(10px) scale(1.02); }
}

/* 导航栏 */
#qianliu .navbar {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    background: rgba(26, 26, 26, 0.95);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    transition: all 0.3s ease;
}

#qianliu .navbar.scrolled {
    background: rgba(26, 26, 26, 0.98);
    box-shadow: var(--shadow-medium);
}

#qianliu .navbar-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

#qianliu .navbar-logo {
    font-size: var(--font-2xl);
    font-weight: 700;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    text-decoration: none;
}

#qianliu .navbar-menu {
    display: flex;
    list-style: none;
    gap: var(--spacing-xl);
}

#qianliu .navbar-menu a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    transition: all 0.3s ease;
    position: relative;
}

#qianliu .navbar-menu a:hover {
    color: var(--primary-color);
}

#qianliu .navbar-menu a::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 2px;
    background: var(--primary-color);
    transition: width 0.3s ease;
}

#qianliu .navbar-menu a:hover::after {
    width: 100%;
}

#qianliu .navbar-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: var(--font-xl);
    cursor: pointer;
}

/* 主要内容区域 */
#qianliu .main-content {
    margin-top: 70px;
}

/* 英雄区域 */
#qianliu .hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    background: radial-gradient(circle at 30% 70%, #1e3c72, #2a5298, #667eea);
    position: relative;
    overflow: hidden;
}

#qianliu .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 0 100 100"><defs><pattern id="grid" width="10" height="10" patternUnits="userSpaceOnUse"><path d="M 10 0 L 0 0 0 10" fill="none" stroke="rgba(255,255,255,0.05)" stroke-width="1"/></pattern></defs><rect width="100" height="100" fill="url(%23grid)"/></svg>');
    opacity: 0.3;
}

#qianliu .hero-content {
    z-index: 2;
    position: relative;
    max-width: 800px;
    padding: 0 var(--spacing-lg);
}

#qianliu .hero-title {
    font-size: var(--font-5xl);
    font-weight: 300;
    margin-bottom: var(--spacing-lg);
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    letter-spacing: 0.02em;
}

#qianliu .hero-subtitle {
    font-size: var(--font-2xl);
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

#qianliu .hero-description {
    font-size: var(--font-lg);
    color: var(--text-muted);
    margin-bottom: var(--spacing-xl);
}

/* 按钮样式 */
#qianliu .btn {
    display: inline-block;
    padding: var(--spacing-md) var(--spacing-xl);
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    color: white;
    text-decoration: none;
    border-radius: var(--radius-lg);
    font-weight: 500;
    transition: all 0.3s ease;
    border: none;
    cursor: pointer;
    font-size: var(--font-base);
}

#qianliu .btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-medium);
}

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

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

/* 卡片组件 */
#qianliu .card {
    background: var(--bg-light);
    padding: var(--spacing-xl);
    border-radius: var(--radius-lg);
    border: 1px solid var(--border-color);
    backdrop-filter: blur(10px);
    transition: all 0.3s ease;
}

#qianliu .card:hover {
    background: var(--bg-lighter);
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

#qianliu .card-icon {
    font-size: var(--font-4xl);
    margin-bottom: var(--spacing-md);
    text-align: center;
}

#qianliu .card-title {
    font-size: var(--font-xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

#qianliu .card-content {
    color: var(--text-secondary);
    line-height: 1.7;
}

/* 网格布局 */
#qianliu .grid {
    display: grid;
    gap: var(--spacing-lg);
}

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

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

#qianliu .grid-4 {
    grid-template-columns: repeat(4, 1fr);
}

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

#qianliu .section {
    padding: var(--spacing-xxl) 0;
}

#qianliu .section-title {
    font-size: var(--font-4xl);
    text-align: center;
    margin-bottom: var(--spacing-xl);
    font-weight: 300;
    letter-spacing: 0.01em;
}

#qianliu .section-subtitle {
    font-size: var(--font-lg);
    text-align: center;
    color: var(--text-muted);
    margin-bottom: var(--spacing-xxl);
    max-width: 600px;
    margin-left: auto;
    margin-right: auto;
}

/* 项目展示区域 */
#qianliu .projects-section {
    background: var(--bg-darker);
    position: relative;
}

#qianliu .projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xxl);
}

#qianliu .project-card {
    background: var(--bg-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: all 0.3s ease;
    border: 1px solid var(--border-color);
}

#qianliu .project-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

#qianliu .project-image {
    width: 100%;
    height: 200px;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: var(--font-4xl);
    color: white;
}

#qianliu .project-content {
    padding: var(--spacing-xl);
}

#qianliu .project-title {
    font-size: var(--font-2xl);
    color: var(--primary-color);
    margin-bottom: var(--spacing-md);
    font-weight: 500;
}

#qianliu .project-description {
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    line-height: 1.7;
}

#qianliu .project-features {
    list-style: none;
    margin-bottom: var(--spacing-lg);
}

#qianliu .project-features li {
    padding: var(--spacing-xs) 0;
    color: var(--text-secondary);
    position: relative;
    padding-left: var(--spacing-lg);
}

#qianliu .project-features li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary-color);
    font-weight: bold;
}

/* 联系信息区域 */
#qianliu .contact-section {
    background: linear-gradient(135deg, rgba(30, 60, 114, 0.9), rgba(42, 82, 152, 0.9));
    position: relative;
}

#qianliu .contact-info {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-xl);
    margin-top: var(--spacing-xxl);
}

#qianliu .contact-item {
    text-align: center;
    padding: var(--spacing-xl);
}

#qianliu .contact-icon {
    font-size: var(--font-4xl);
    margin-bottom: var(--spacing-md);
    color: var(--primary-color);
}

#qianliu .contact-title {
    font-size: var(--font-xl);
    color: var(--text-primary);
    margin-bottom: var(--spacing-sm);
    font-weight: 500;
}

#qianliu .contact-value {
    color: var(--text-secondary);
    font-size: var(--font-lg);
    min-height: 60px;
    margin-bottom: 16px;
}

/* 页脚 */
#qianliu .footer {
    background: var(--bg-darker);
    padding: var(--spacing-xxl) 0 var(--spacing-xl);
    text-align: center;
    border-top: 1px solid var(--border-color);
}

#qianliu .footer-content {
    color: var(--text-muted);
    font-size: var(--font-sm);
}

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

#qianliu .mb-sm { margin-bottom: var(--spacing-sm); }
#qianliu .mb-md { margin-bottom: var(--spacing-md); }
#qianliu .mb-lg { margin-bottom: var(--spacing-lg); }
#qianliu .mb-xl { margin-bottom: var(--spacing-xl); }

#qianliu .mt-sm { margin-top: var(--spacing-sm); }
#qianliu .mt-md { margin-top: var(--spacing-md); }
#qianliu .mt-lg { margin-top: var(--spacing-lg); }
#qianliu .mt-xl { margin-top: var(--spacing-xl); }

#qianliu .highlight {
    color: var(--primary-color);
    font-weight: 500;
    text-shadow: 0 0 10px rgba(0, 210, 255, 0.3);
}

#qianliu .text-success { color: #51cf66; }
#qianliu .text-warning { color: #ffd43b; }
#qianliu .text-danger { color: #ff6b6b; }

/* 动画类 */
#qianliu .fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s ease;
}

#qianliu .fade-in.visible {
    opacity: 1;
    transform: translateY(0);
}

#qianliu .slide-in-left {
    opacity: 0;
    transform: translateX(-50px);
    transition: all 0.8s ease;
}

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

#qianliu .slide-in-right {
    opacity: 0;
    transform: translateX(50px);
    transition: all 0.8s ease;
}

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

/* 滚动指示器 */
#qianliu .scroll-indicator {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    z-index: 9999;
    color: var(--text-muted);
    font-size: var(--font-sm);
    text-align: center;
    animation: bounce 2s infinite;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {
        transform: translateX(-50%) translateY(0);
    }
    40% {
        transform: translateX(-50%) translateY(-10px);
    }
    60% {
        transform: translateX(-50%) translateY(-5px);
    }
}

#qianliu .scroll-indicator.hidden {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease;
}

/* Header 样式 */
#qianliu .header-container {
    background: linear-gradient(135deg, #00133C, #084ACA);
    width: 100vw;
}

#qianliu .main-header {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: space-between;
    width: 1200px;
    margin: 0 auto;
    overflow: hidden;
}

#qianliu .header-title {
    display: flex;
    flex-direction: column;
    gap: 8px;
    padding: 80px 0;
    z-index: 1;
}

#qianliu .header-title-text {
    font-size: var(--font-3xl);
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: 0 0 20px rgba(0, 210, 255, 0.3);
}

#qianliu .header-title-btn {
    width: 120px;
    padding: var(--spacing-sm) var(--spacing-md);
    margin-top: 8px;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    border-radius: var(--radius-md);
    font-size: var(--font-sm);
    font-weight: 500;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px rgba(0, 210, 255, 0.3);
}

#qianliu .header-title-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(0, 210, 255, 0.4);
}

#qianliu .header-icon {
    position: relative;
    width: 480px;
    height: 240px;
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1;
}

/* 虚线椭圆样式 */
#qianliu .header-icon::before {
    content: '';
    position: absolute;
    width: 360px;
    height: 180px;
    border: 2px dashed var(--primary-color);
    border-radius: 50%;
    /* animation: rotateEllipse 8s linear infinite; */
    box-shadow:
        0 0 10px rgba(0, 210, 255, 0.3),
        inset 0 0 10px rgba(0, 210, 255, 0.1);
}

/* #qianliu .header-icon::after {
    content: '';
    position: absolute;
    width: 80px;
    height: 40px;
    border: 1px dashed var(--secondary-color);
    border-radius: 50%;
    animation: rotateEllipse 6s linear infinite reverse;
    box-shadow:
        0 0 8px rgba(58, 123, 213, 0.3),
        inset 0 0 8px rgba(58, 123, 213, 0.1);
} */

/* 椭圆旋转动画 */
/* @keyframes rotateEllipse {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
} */

#qianliu .header-icon-img {
    position: absolute;
    transform: translate(-50%, -50%);
    width: 48px;
    height: auto;
}

/* 响应式调整 */
@media (max-width: 768px) {
    #qianliu .main-header {
        flex-direction: column;
        gap: var(--spacing-md);
        padding: var(--spacing-md);
    }

    #qianliu .header-title-text {
        flex-direction: column;
        gap: var(--spacing-sm);
        text-align: center;
    }

    #qianliu .header-title-text-title {
        font-size: var(--font-2xl);
    }

    #qianliu .header-icon {
        width: 100px;
        height: 60px;
    }

    #qianliu .header-icon::before {
        width: 80px;
        height: 50px;
    }

    /* #qianliu .header-icon::after {
        width: 60px;
        height: 30px;
    } */
}

/* Section 样式 */
#qianliu .section {
    padding: var(--spacing-xxl) 0;
    background: #ffffff;
}

#qianliu .section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 32px 0;
}

#qianliu .section-header {
    color: #333;
}

#qianliu .section-header-title {
    text-align: center;
    font-size: 32px;
    font-weight: 500;
    color: #020202;
    line-height: 48px;
}

#qianliu .section-header-desc {
    text-align: center;
    font-size: 20px;
    font-weight: 400;
    color: #555555;
    padding: 24px 0 64px 0;
}

#qianliu .section-content {
    display: flex;
    gap: 32px;
    align-items: flex-start;
}

/* 左侧标题列表样式 */
#qianliu .section-titles {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 16px;
}

#qianliu .section-title-item {
    display: flex;
    align-items: flex-start;
    gap: var(--spacing-md);
    padding: var(--spacing-sm);
    border-radius: var(--radius-lg);
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f8f9fa;
}

#qianliu .section-title-item:hover {
    background: #e9ecef;
    /* transform: translateX(10px); */
}

#qianliu .section-title-item.active {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: white;
    box-shadow: 0 8px 25px rgba(0, 210, 255, 0.3);
    /* transform: translateX(10px); */
}

#qianliu .title-number {
    font-size: var(--font-2xl);
    font-weight: 700;
    color: var(--primary-color);
    min-width: 60px;
    text-align: center;
    line-height: 1;
}

#qianliu .section-title-item.active .title-number {
    color: white;
}

#qianliu .title-content h3 {
    font-size: var(--font-xl);
    font-weight: 600;
    margin-bottom: var(--spacing-xs);
    color: #333;
}

#qianliu .section-title-item.active .title-content h3 {
    color: white;
}

#qianliu .title-content p {
    font-size: var(--font-sm);
    color: #666;
    line-height: 1.5;
    margin: 0;
}

#qianliu .section-title-item.active .title-content p {
    color: rgba(255, 255, 255, 0.9);
}

/* 右侧图片展示区域样式 */
#qianliu .section-image-area {
    flex-shrink: 0;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 360px;
    width: 640px;
}

#qianliu .image-container {
    position: relative;
    border-radius: var(--radius-lg);
    width: 100%;
    height: 100%;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
}

#qianliu .section-image {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 0.5s ease;
}

#qianliu .section-image.active {
    opacity: 1;
}

/* 响应式设计 */
@media (max-width: 768px) {
    #qianliu .section-content {
        flex-direction: column;
        gap: var(--spacing-lg);
    }

    #qianliu .section-titles {
        order: 2;
    }

    #qianliu .section-title-item {
        padding: var(--spacing-md);
    }

    #qianliu .title-number {
        min-width: 50px;
        font-size: var(--font-xl);
    }

    #qianliu .title-content h3 {
        font-size: var(--font-lg);
    }
}