/* ===================================
   全局变量和基础样式
   =================================== */

:root {
    /* 暗红色主题配色 */
    --primary-red: #8B0000;
    --secondary-red: #DC143C;
    --accent-red: #B22222;
    --dark-red: #5D0000;
    --light-red: #FF6B6B;
    
    /* 辅助颜色 */
    --dark-bg: #0A0A0A;
    --dark-secondary: #1A1A1A;
    --dark-card: #2A2A2A;
    --text-primary: #FFFFFF;
    --text-secondary: #CCCCCC;
    --text-muted: #999999;
    
    /* 渐变色彩 */
    --gradient-primary: linear-gradient(135deg, var(--primary-red) 0%, var(--secondary-red) 100%);
    --gradient-dark: linear-gradient(135deg, var(--dark-bg) 0%, var(--dark-secondary) 100%);
    --gradient-card: linear-gradient(135deg, var(--dark-card) 0%, #3A3A3A 100%);
    
    /* 阴影效果 */
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-medium: 0 10px 25px rgba(139, 0, 0, 0.3);
    --shadow-heavy: 0 20px 40px rgba(139, 0, 0, 0.4);
    --shadow-glow: 0 0 30px rgba(220, 20, 60, 0.5);
    
    /* 动画参数 */
    --transition-fast: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-medium: 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-slow: 0.8s cubic-bezier(0.4, 0, 0.2, 1);
    
    /* 布局尺寸 */
    --container-max-width: 1200px;
    --section-padding: 100px 0;
    --border-radius: 12px;
    --border-radius-large: 20px;
}

/* ===================================
   重置和基础样式
   =================================== */

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

html {
    scroll-behavior: smooth;
    scroll-padding-top: 80px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--dark-bg);
    overflow-x: hidden;
    position: relative;
}

.container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
}

section {
    position: relative;
    padding: var(--section-padding);
}

img {
    max-width: 100%;
    height: auto;
    display: block;
}

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

ul {
    list-style: none;
}

/* ===================================
   粒子背景
   =================================== */

#particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.particle {
    position: absolute;
    background: var(--secondary-red);
    border-radius: 50%;
    opacity: 0.6;
    animation: float 6s ease-in-out infinite;
}

@keyframes float {
    0%, 100% { transform: translateY(0px) rotate(0deg); }
    50% { transform: translateY(-20px) rotate(180deg); }
}

/* ===================================
   导航栏样式
   =================================== */

.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(10, 10, 10, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    transition: var(--transition-medium);
    border-bottom: 1px solid rgba(139, 0, 0, 0.3);
}

.navbar.scrolled {
    background: rgba(10, 10, 10, 0.98);
    box-shadow: var(--shadow-medium);
}

.nav-container {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 80px;
}

.nav-logo img {
    height: 40px;
    transition: var(--transition-fast);
}

.nav-logo:hover img {
    transform: scale(1.05);
    filter: drop-shadow(0 0 10px var(--secondary-red));
}

.nav-menu {
    display: flex;
    gap: 40px;
    align-items: center;
}

.nav-link {
    position: relative;
    font-weight: 500;
    color: var(--text-secondary);
    padding: 10px 0;
}

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

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

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

/* 汉堡菜单 */
.hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    padding: 5px;
}

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    margin: 3px 0;
    transition: var(--transition-fast);
}

.hamburger.active span:nth-child(1) {
    transform: rotate(45deg) translate(6px, 6px);
}

.hamburger.active span:nth-child(2) {
    opacity: 0;
}

.hamburger.active span:nth-child(3) {
    transform: rotate(-45deg) translate(6px, -6px);
}

/* ===================================
   英雄区域样式
   =================================== */

.hero {
    min-height: 100vh;
    display: flex;
    align-items: center;
    position: relative;
    background: var(--gradient-dark);
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(139, 0, 0, 0.1) 0%, transparent 70%);
    pointer-events: none;
}

.hero-content {
    max-width: var(--container-max-width);
    margin: 0 auto;
    padding: 0 20px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
    position: relative;
    z-index: 1;
}

.hero-title {
    font-size: 4rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 20px;
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.hero-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-bottom: 40px;
    line-height: 1.8;
}

.hero-buttons {
    display: flex;
    gap: 20px;
    flex-wrap: wrap;
}

/* 浮动卡片 */
.floating-card {
    position: relative;
    border-radius: var(--border-radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
    animation: float 4s ease-in-out infinite;
    border: 1px solid rgba(139, 0, 0, 0.3);
}

.floating-card img {
    width: 100%;
    height: auto;
    transition: var(--transition-slow);
}

.floating-card:hover img {
    transform: scale(1.1);
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    animation: bounce 2s infinite;
}

.scroll-arrow {
    width: 30px;
    height: 50px;
    border: 2px solid var(--secondary-red);
    border-radius: 15px;
    position: relative;
}

.scroll-arrow::before {
    content: '';
    position: absolute;
    top: 10px;
    left: 50%;
    transform: translateX(-50%);
    width: 4px;
    height: 10px;
    background: var(--secondary-red);
    border-radius: 2px;
    animation: scroll 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); }
}

@keyframes scroll {
    0% { opacity: 1; top: 10px; }
    100% { opacity: 0; top: 20px; }
}

/* ===================================
   通用组件样式
   =================================== */

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 15px 35px;
    font-weight: 600;
    text-align: center;
    border: none;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition-medium);
    position: relative;
    overflow: hidden;
}

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

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-heavy);
}

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

.btn-secondary:hover {
    background: var(--secondary-red);
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

/* 段落标题 */
.section-header {
    text-align: center;
    margin-bottom: 80px;
}

.section-title {
    font-size: 3rem;
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: 20px;
    position: relative;
    display: inline-block;
}

.section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--gradient-primary);
    border-radius: 2px;
}

.section-subtitle {
    font-size: 1.25rem;
    color: var(--text-secondary);
    margin-top: 30px;
}

/* ===================================
   关于我们样式
   =================================== */

.about {
    background: var(--gradient-dark);
    position: relative;
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: center;
}

.about-text h3 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--text-primary);
}

.about-text p {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 40px;
}

/* 统计数据 */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 30px;
}

.stat-item {
    text-align: center;
    padding: 20px;
    background: var(--gradient-card);
    border-radius: var(--border-radius);
    border: 1px solid rgba(139, 0, 0, 0.2);
    transition: var(--transition-fast);
}

.stat-item:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-medium);
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 800;
    color: var(--secondary-red);
    margin-bottom: 10px;
}

.stat-item p {
    margin: 0;
    font-weight: 600;
    color: var(--text-secondary);
}

/* 图片卡片 */
.image-card {
    position: relative;
    border-radius: var(--border-radius-large);
    overflow: hidden;
    box-shadow: var(--shadow-heavy);
    border: 1px solid rgba(139, 0, 0, 0.3);
}

.image-card img {
    width: 100%;
    height: 400px;
    object-fit: cover;
    transition: var(--transition-slow);
}

.image-card:hover img {
    transform: scale(1.05);
}

/* ===================================
   服务样式
   =================================== */

.services {
    background: var(--dark-bg);
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
}

.service-card {
    background: var(--gradient-card);
    padding: 40px 30px;
    border-radius: var(--border-radius-large);
    text-align: center;
    transition: var(--transition-medium);
    border: 1px solid rgba(139, 0, 0, 0.2);
    position: relative;
    overflow: hidden;
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--gradient-primary);
    opacity: 0;
    transition: var(--transition-medium);
    z-index: 1;
}

.service-card:hover::before {
    opacity: 0.1;
}

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
    border-color: var(--secondary-red);
}

.service-icon {
    width: 80px;
    height: 80px;
    margin: 0 auto 30px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    color: white;
    transition: var(--transition-medium);
    position: relative;
    z-index: 2;
}

.service-card:hover .service-icon {
    transform: rotateY(360deg);
    box-shadow: var(--shadow-glow);
}

.service-card h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--text-primary);
    position: relative;
    z-index: 2;
}

.service-card p {
    color: var(--text-secondary);
    line-height: 1.8;
    margin-bottom: 25px;
    position: relative;
    z-index: 2;
}

.service-link {
    color: var(--secondary-red);
    font-weight: 600;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    position: relative;
    z-index: 2;
}

.service-link:hover {
    color: var(--light-red);
    transform: translateX(5px);
}

/* ===================================
   团队样式
   =================================== */

.team {
    background: var(--gradient-dark);
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
}

.team-member {
    background: var(--gradient-card);
    border-radius: var(--border-radius-large);
    overflow: hidden;
    transition: var(--transition-medium);
    border: 1px solid rgba(139, 0, 0, 0.2);
}

.team-member:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-heavy);
}

.member-avatar {
    position: relative;
    overflow: hidden;
    height: 300px;
}

.member-avatar img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition-slow);
}

.team-member:hover .member-avatar img {
    transform: scale(1.1);
}

.member-info {
    padding: 30px;
    text-align: center;
    background: var(--gradient-card);
}

.member-info h3 {
    font-size: 1.5rem;
    margin-bottom: 10px;
    color: var(--text-primary);
}

.member-info p {
    color: var(--text-secondary);
    margin-bottom: 20px;
}

.member-social {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.member-social a {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition-fast);
}

.member-social a:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

/* ===================================
   联系表单样式
   =================================== */

.contact {
    background: var(--dark-bg);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 80px;
    align-items: start;
}

/* 联系信息 */
.contact-info {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.info-item {
    display: flex;
    align-items: center;
    gap: 20px;
    padding: 25px;
    background: var(--gradient-card);
    border-radius: var(--border-radius);
    border: 1px solid rgba(139, 0, 0, 0.2);
    transition: var(--transition-fast);
}

.info-item:hover {
    transform: translateX(10px);
    border-color: var(--secondary-red);
}

.info-icon {
    width: 60px;
    height: 60px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    color: white;
    flex-shrink: 0;
}

.info-text h4 {
    font-size: 1.25rem;
    margin-bottom: 5px;
    color: var(--text-primary);
}

.info-text p {
    color: var(--text-secondary);
    margin: 0;
}

/* 联系表单 */
.contact-form {
    background: var(--gradient-card);
    padding: 40px;
    border-radius: var(--border-radius-large);
    border: 1px solid rgba(139, 0, 0, 0.2);
}

.form-group {
    margin-bottom: 25px;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 15px 20px;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(139, 0, 0, 0.3);
    border-radius: var(--border-radius);
    color: var(--text-primary);
    font-size: 1rem;
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--secondary-red);
    box-shadow: 0 0 15px rgba(220, 20, 60, 0.3);
}

.form-group input::placeholder,
.form-group textarea::placeholder {
    color: var(--text-muted);
}

/* ===================================
   页脚样式
   =================================== */

.footer {
    background: var(--dark-secondary);
    padding: 60px 0 20px;
    border-top: 1px solid rgba(139, 0, 0, 0.3);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 40px;
}

.footer-section h4 {
    font-size: 1.25rem;
    margin-bottom: 20px;
    color: var(--text-primary);
}

.footer-section p {
    color: var(--text-secondary);
    line-height: 1.8;
}

.footer-section ul li {
    margin-bottom: 10px;
}

.footer-section ul li a {
    color: var(--text-secondary);
    transition: var(--transition-fast);
}

.footer-section ul li a:hover {
    color: var(--secondary-red);
    padding-left: 5px;
}

.social-links {
    display: flex;
    gap: 15px;
}

.social-links a {
    width: 40px;
    height: 40px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    transition: var(--transition-fast);
}

.social-links a:hover {
    transform: translateY(-3px);
    box-shadow: var(--shadow-medium);
}

.footer-bottom {
    text-align: center;
    padding-top: 40px;
    border-top: 1px solid rgba(139, 0, 0, 0.2);
}

.footer-bottom p {
    color: var(--text-muted);
    margin: 0;
}

/* ===================================
   返回顶部按钮
   =================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--gradient-primary);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-medium);
    z-index: 999;
    box-shadow: var(--shadow-medium);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-heavy);
}

/* ===================================
   响应式设计
   =================================== */

@media (max-width: 1200px) {
    .hero-title {
        font-size: 3.5rem;
    }
    
    .hero-content,
    .about-content,
    .contact-content {
        gap: 60px;
    }
}

@media (max-width: 992px) {
    :root {
        --section-padding: 80px 0;
    }
    
    .hero-content,
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.5rem;
    }
    
    .hero-visual,
    .about-image {
        order: -1;
    }
    
    .floating-card,
    .image-card {
        max-width: 500px;
        margin: 0 auto;
    }
    
    .stats-grid {
        max-width: 500px;
        margin: 0 auto;
    }
}

@media (max-width: 768px) {
    :root {
        --section-padding: 60px 0;
    }
    
    .nav-menu {
        position: fixed;
        top: 80px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 80px);
        background: var(--dark-secondary);
        flex-direction: column;
        justify-content: flex-start;
        padding-top: 50px;
        gap: 30px;
        transition: var(--transition-medium);
    }
    
    .nav-menu.active {
        left: 0;
    }
    
    .hamburger {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .hero-buttons {
        justify-content: center;
    }
    
    .services-grid {
        grid-template-columns: 1fr;
        max-width: 500px;
        margin: 0 auto;
    }
    
    .team-grid {
        grid-template-columns: 1fr;
        max-width: 400px;
        margin: 0 auto;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }
    
    .btn {
        padding: 12px 30px;
        font-size: 0.9rem;
    }
}

@media (max-width: 576px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .service-card,
    .contact-form {
        padding: 30px 20px;
    }
    
    .footer-content {
        grid-template-columns: 1fr;
        text-align: center;
    }
    
    .social-links {
        justify-content: center;
    }
}

/* ===================================
   加载动画
   =================================== */

.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition-medium);
}

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

/* 文本渐变效果 */
.text-gradient {
    background: var(--gradient-primary);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    position: relative;
}

.text-gradient::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 100%;
    height: 2px;
    background: var(--gradient-primary);
    transform: scaleX(0);
    transform-origin: right;
    transition: var(--transition-medium);
}

.text-gradient:hover::after {
    transform: scaleX(1);
    transform-origin: left;
}