/* 导入Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;500;600;700&family=Noto+Sans+SC:wght@300;400;500;700&display=swap');

/* 2025年设计系统 */
:root {
    /* 颜色 - 紫蓝渐变色系 */
    --primary-gradient: linear-gradient(135deg, #6366f1 0%, #8b5cf6 100%);
    --primary-color: #6366f1;
    --primary-dark: #4f46e5;
    --primary-light: #a5b4fc;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --text-primary: #1f2937;
    --text-secondary: #4b5563;
    --text-light: #9ca3af;
    --background-light: #ffffff;
    --background-off: #f9fafb;
    --background-dark: #111827;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* 字体 */
    --font-primary: 'Poppins', 'Noto Sans SC', sans-serif;
    --font-secondary: 'Noto Sans SC', sans-serif;
    
    /* 间距 */
    --space-xs: 0.25rem;
    --space-sm: 0.5rem;
    --space-md: 1rem;
    --space-lg: 1.5rem;
    --space-xl: 2rem;
    --space-2xl: 3rem;
    --space-3xl: 4rem;
    
    /* 边框半径 */
    --radius-sm: 0.25rem;
    --radius-md: 0.5rem;
    --radius-lg: 1rem;
    --radius-xl: 1.5rem;
    --radius-full: 9999px;
    
    /* 阴影 */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.05);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
    
    /* 过渡 */
    --transition-fast: 0.2s ease;
    --transition-normal: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* Z-index */
    --z-dropdown: 1000;
    --z-sticky: 1020;
    --z-fixed: 1030;
    --z-modal: 1040;
    --z-popover: 1050;
    --z-tooltip: 1060;
}

/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-primary);
    color: var(--text-primary);
    background-color: var(--background-light);
    line-height: 1.6;
    font-size: 16px;
    font-weight: 400;
    overflow-x: hidden;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

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

ul, ol {
    list-style: none;
}

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

button, input, textarea {
    font-family: var(--font-primary);
    font-size: 1rem;
    border: none;
    outline: none;
}

/* 入口动画 */
#entry-animation-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-modal);
    opacity: 1;
    transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

#entry-animation-container.hidden {
    opacity: 0;
    visibility: hidden;
}

.loader {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    letter-spacing: 0.1em;
    position: relative;
}

.loader-text {
    color: white;
}

.loader-highlight {
    color: rgba(255, 255, 255, 0.8);
    font-weight: 300;
}

.loader.pulse {
    animation: pulse 1.5s infinite alternate;
}

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

/* 主内容区域 */
.main-content {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity var(--transition-normal), transform var(--transition-normal);
}

.main-content.visible {
    opacity: 1;
    transform: translateY(0);
}

/* 导航栏 */
nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: var(--z-sticky);
    background-color: rgba(255, 255, 255, 0.9);
    backdrop-filter: blur(10px);
    transition: var(--transition-normal);
    box-shadow: var(--shadow-sm);
}

nav.scrolled {
    box-shadow: var(--shadow-md);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo a {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
}

.logo span {
    color: var(--primary-color);
    font-weight: 400;
}

.nav-links {
    display: flex;
    gap: 2rem;
}

.nav-links a {
    color: var(--text-secondary);
    font-weight: 500;
    position: relative;
    padding: 0.5rem 0;
}

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

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

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

.contact-link {
    background: var(--primary-gradient);
    color: white !important;
    padding: 0.5rem 1.5rem !important;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-md);
}

.contact-link:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.contact-link::after {
    display: none !important;
}

.mobile-menu-button {
    display: none;
    flex-direction: column;
    justify-content: space-between;
    width: 30px;
    height: 20px;
    cursor: pointer;
}

.mobile-menu-button span {
    height: 2px;
    width: 100%;
    background-color: var(--text-primary);
    transition: var(--transition-fast);
}

.mobile-menu-button.active span:nth-child(1) {
    transform: translateY(9px) rotate(45deg);
}

.mobile-menu-button.active span:nth-child(2) {
    opacity: 0;
}

.mobile-menu-button.active span:nth-child(3) {
    transform: translateY(-9px) rotate(-45deg);
}

.mobile-menu {
    position: fixed;
    top: 70px;
    left: 0;
    width: 100%;
    background-color: var(--background-light);
    padding: 1rem;
    box-shadow: var(--shadow-md);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition-normal);
    z-index: var(--z-dropdown);
}

.mobile-menu.active {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.mobile-menu a {
    display: block;
    padding: 1rem;
    color: var(--text-secondary);
    font-weight: 500;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
}

.mobile-menu a:last-child {
    border-bottom: none;
}

.mobile-menu a:hover {
    color: var(--primary-color);
    background-color: rgba(0, 0, 0, 0.02);
}

/* 英雄区域 */
#hero {
    min-height: 100vh;
    background: var(--primary-gradient);
    position: relative;
    overflow: hidden;
    display: flex;
    align-items: center;
    padding-top: 80px;
}

.hero-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    position: relative;
    z-index: 1;
    width: 100%;
}

.hero-content {
    max-width: 700px;
    color: white;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 1.5rem;
    line-height: 1.2;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}

.hero-title.animated {
    opacity: 1;
    transform: translateY(0);
}

.hero-subtitle {
    font-size: 1.25rem;
    margin-bottom: 2rem;
    opacity: 0.9;
    max-width: 600px;
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease 0.2s, transform 0.8s ease 0.2s;
}

.hero-subtitle.animated {
    opacity: 0.9;
    transform: translateY(0);
}

.hero-button {
    display: inline-block;
    background-color: white;
    color: var(--primary-color);
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: var(--radius-full);
    box-shadow: var(--shadow-lg);
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.8s ease 0.4s, transform 0.8s ease 0.4s, background-color 0.3s ease, box-shadow 0.3s ease;
}

.hero-button.animated {
    opacity: 1;
    transform: translateY(0);
}

.hero-button:hover {
    background-color: rgba(255, 255, 255, 0.9);
    box-shadow: var(--shadow-xl);
    transform: translateY(-3px);
}

.hero-decoration {
    position: absolute;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.1);
    filter: blur(40px);
}

.hero-decoration-1 {
    width: 300px;
    height: 300px;
    top: -100px;
    right: -50px;
    background: rgba(255, 255, 255, 0.1);
    animation: float 8s infinite alternate ease-in-out;
}

.hero-decoration-2 {
    width: 200px;
    height: 200px;
    bottom: 100px;
    right: 100px;
    background: rgba(236, 72, 153, 0.1);
    animation: float 12s infinite alternate-reverse ease-in-out;
}

.hero-decoration-3 {
    width: 250px;
    height: 250px;
    bottom: -50px;
    left: 10%;
    background: rgba(99, 102, 241, 0.15);
    animation: float 10s infinite alternate ease-in-out;
}

@keyframes float {
    0% {
        transform: translate(0, 0);
    }
    100% {
        transform: translate(20px, 20px);
    }
}

/* 部分通用样式 */
.section-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 5rem 2rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 3rem;
    text-align: center;
    position: relative;
}

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

/* 服务卡片 */
.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.service-card {
    background-color: var(--background-light);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    position: relative;
    overflow: hidden;
    z-index: 1;
}

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

.service-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.service-card:hover::before {
    opacity: 0.05;
}

.service-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: var(--radius-md);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 1.5rem;
    color: white;
    font-size: 1.5rem;
}

.service-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.service-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 关于我们部分 */
#about {
    background-color: var(--background-off);
}

.about-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
}

.about-image img {
    border-radius: var(--radius-lg);
    box-shadow: var(--shadow-lg);
    width: 100%;
}

.about-text p {
    margin-bottom: 1.5rem;
    color: var(--text-secondary);
}

.about-stats {
    display: flex;
    gap: 2rem;
    margin-top: 2rem;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--primary-color);
    margin-bottom: 0.5rem;
}

.stat-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

/* 项目案例部分 */
.projects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.project-card {
    background-color: var(--background-light);
    border-radius: var(--radius-lg);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
}

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

.project-image {
    overflow: hidden;
}

.project-image img {
    transition: var(--transition-normal);
    width: 100%;
}

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

.project-info {
    padding: 1.5rem;
}

.project-info h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
}

.project-info p {
    color: var(--text-secondary);
    font-size: 0.95rem;
    margin-bottom: 1rem;
}

.project-link {
    display: inline-block;
    color: var(--primary-color);
    font-weight: 500;
    font-size: 0.9rem;
    position: relative;
}

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

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

/* 优势部分 */
#advantages {
    background-color: var(--background-off);
}

.advantages-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
}

.advantage-card {
    background-color: var(--background-light);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: var(--shadow-md);
    transition: var(--transition-normal);
    text-align: center;
}

.advantage-card:hover {
    transform: translateY(-10px);
    box-shadow: var(--shadow-lg);
}

.advantage-icon {
    width: 70px;
    height: 70px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    margin: 0 auto 1.5rem;
    color: white;
    font-size: 1.75rem;
}

.advantage-card h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
}

.advantage-card p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* 联系我们部分 */
#contact {
    background-color: var(--background-light);
}

.contact-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
}

.contact-info {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.contact-item {
    display: flex;
    align-items: flex-start;
    gap: 1rem;
}

.contact-item i {
    color: var(--primary-color);
    font-size: 1.25rem;
    margin-top: 0.25rem;
}

.social-links {
    display: flex;
    gap: 1rem;
    margin-top: 1.5rem;
}

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

.social-link:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow-md);
}

.contact-form form {
    display: flex;
    flex-direction: column;
    gap: 1.25rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 1rem;
    border-radius: var(--radius-md);
    background-color: var(--background-off);
    transition: var(--transition-fast);
}

.form-group input:focus,
.form-group textarea:focus {
    box-shadow: 0 0 0 2px var(--primary-light);
}

.form-group textarea {
    min-height: 150px;
    resize: vertical;
}

.submit-button {
    background: var(--primary-gradient);
    color: white;
    font-weight: 600;
    padding: 1rem 2rem;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: var(--transition-fast);
    box-shadow: var(--shadow-md);
}

.submit-button:hover {
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

/* 页脚 */
footer {
    background-color: var(--background-dark);
    color: white;
    padding: 3rem 0;
}

.footer-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 2rem;
}

.footer-logo a {
    font-size: 1.75rem;
    font-weight: 700;
}

.footer-logo span {
    color: var(--primary-light);
    font-weight: 400;
}

.footer-links {
    display: flex;
    gap: 2rem;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    transition: var(--transition-fast);
}

.footer-links a:hover {
    color: white;
}

.footer-copyright {
    color: rgba(255, 255, 255, 0.5);
    font-size: 0.9rem;
}

/* 浮动联系按钮 */
#floating-contact {
    position: fixed;
    bottom: 2rem;
    right: 2rem;
    z-index: var(--z-fixed);
}

.contact-button {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
    box-shadow: var(--shadow-lg);
    transition: var(--transition-fast);
}

.contact-button:hover {
    transform: scale(1.1);
}

.contact-button.clicked {
    transform: scale(0.95);
}

.contact-details {
    position: absolute;
    bottom: 75px;
    right: 0;
    background-color: white;
    border-radius: var(--radius-lg);
    padding: 1.5rem;
    width: 300px;
    box-shadow: var(--shadow-xl);
    display: none;
}

.contact-details h3 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.contact-details .contact-item {
    margin-bottom: 0.75rem;
}

.contact-details .contact-item p {
    color: var(--text-secondary);
}

.contact-details .social-links {
    margin-top: 1rem;
}

/* 卡片悬停效果 */
.card-hover {
    transition: var(--transition-normal);
    opacity: 0;
    transform: translateY(30px);
}

.card-hover.animated {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 1024px) {
    .hero-title {
        font-size: 3rem;
    }
    
    .section-title {
        font-size: 2.25rem;
    }
    
    .about-content,
    .contact-content {
        grid-template-columns: 1fr;
        gap: 2rem;
    }
    
    .about-image {
        order: -1;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .mobile-menu-button {
        display: flex;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.1rem;
    }
    
    .section-container {
        padding: 4rem 1.5rem;
    }
    
    .section-title {
        font-size: 2rem;
    }
    
    .footer-links {
        flex-wrap: wrap;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 1rem;
    }
    
    .hero-title {
        font-size: 2rem;
    }
    
    .hero-button {
        padding: 0.75rem 1.5rem;
    }
    
    .section-container {
        padding: 3rem 1rem;
    }
    
    .section-title {
        font-size: 1.75rem;
    }
    
    .contact-details {
        width: 250px;
    }
}