/* 导入Google字体 */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Space+Grotesk:wght@400;500;600;700&display=swap');

/* CSS 变量定义 */
:root {
    /* 主色调 */
    --primary-color: #8b5cf6;
    --primary-light: #a78bfa;
    --primary-dark: #7c3aed;
    --primary-gradient: linear-gradient(135deg, #8b5cf6 0%, #ec4899 100%);
    
    /* 辅助色 */
    --secondary-color: #f59e0b;
    --secondary-light: #fbbf24;
    --secondary-dark: #d97706;
    --secondary-gradient: linear-gradient(135deg, #f59e0b 0%, #ef4444 100%);
    
    /* 功能色 */
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --info-color: #3b82f6;
    
    /* 中性色 */
    --background-color: #f8fafc;
    --surface-color: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --text-tertiary: #94a3b8;
    --border-color: #e2e8f0;
    --border-light: #f1f5f9;
    --shadow-sm: 0 1px 2px 0 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);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
    
    /* 间距 */
    --spacing-xs: 0.25rem;
    --spacing-sm: 0.5rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    --spacing-2xl: 3rem;
    --spacing-3xl: 4rem;
    
    /* 圆角 */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    --radius-2xl: 1.5rem;
    --radius-3xl: 2rem;
    --radius-full: 9999px;
    
    /* 过渡 */
    --transition-fast: 0.15s ease;
    --transition-base: 0.3s ease;
    --transition-slow: 0.5s ease;
    
    /* 字体 */
    --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    --font-display: 'Space Grotesk', 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
}



/* 深色主题样式 */
body.dark-mode {
    /* 主色调 */
    --primary-color: #a78bfa;
    --primary-light: #c4b5fd;
    --primary-dark: #7c3aed;
    --primary-gradient: linear-gradient(135deg, #a78bfa 0%, #ec4899 100%);
    
    /* 辅助色 */
    --secondary-color: #fbbf24;
    --secondary-light: #fcd34d;
    --secondary-dark: #d97706;
    --secondary-gradient: linear-gradient(135deg, #fbbf24 0%, #ef4444 100%);
    
    /* 功能色 - 调整以符合深色主题对比度 */
    --success-color: #34d399;
    --warning-color: #fcd34d;
    --error-color: #f87171;
    --info-color: #60a5fa;
    
    /* 中性色 */
    --background-color: #0f172a;
    --surface-color: #1e293b;
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-tertiary: #94a3b8;
    --border-color: #334155;
    --border-light: #475569;
    
    /* 阴影颜色调整 */
    --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
    --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
    --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

/* 系统偏好深色模式支持 */
@media (prefers-color-scheme: dark) {
    body:not(.light-mode) {
        /* 应用与.dark-mode相同的样式 */
        /* 主色调 */
        --primary-color: #a78bfa;
        --primary-light: #c4b5fd;
        --primary-dark: #7c3aed;
        --primary-gradient: linear-gradient(135deg, #a78bfa 0%, #ec4899 100%);
        
        /* 辅助色 */
        --secondary-color: #fbbf24;
        --secondary-light: #fcd34d;
        --secondary-dark: #d97706;
        --secondary-gradient: linear-gradient(135deg, #fbbf24 0%, #ef4444 100%);
        
        /* 功能色 - 调整以符合深色主题对比度 */
        --success-color: #34d399;
        --warning-color: #fcd34d;
        --error-color: #f87171;
        --info-color: #60a5fa;
        
        /* 中性色 */
        --background-color: #0f172a;
        --surface-color: #1e293b;
        --text-primary: #f8fafc;
        --text-secondary: #cbd5e1;
        --text-tertiary: #94a3b8;
        --border-color: #334155;
        --border-light: #475569;
        
        /* 阴影颜色调整 */
        --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.2);
        --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
        --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);
        --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.4), 0 10px 10px -5px rgba(0, 0, 0, 0.3);
        --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
}

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

/* 基础样式 */
html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-sans);
    line-height: 1.6;
    color: var(--text-primary);
    background-color: var(--background-color);
    overflow-x: hidden;
    transition: background-color var(--transition-base), color var(--transition-base);
}

/* 为所有使用CSS变量的元素添加过渡效果 */
* {
    transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

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

::-webkit-scrollbar-track {
    background: var(--border-light);
    border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: var(--radius-full);
    transition: background var(--transition-base);
}

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

/* 容器 */
.container {
    width: 100%;
    max-width: 1280px;
    margin: 0 auto;
    padding: 0 var(--spacing-lg);
}

/* 头部样式 */
header {
    background-color: rgba(255, 255, 255, 0.95);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    color: var(--text-primary);
    padding: var(--spacing-md) 0;
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 1000;
    box-shadow: var(--shadow-md);
    transition: all var(--transition-base);
    border-bottom: 1px solid var(--border-light);
}

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

/* 暗色模式头部 */
@media (prefers-color-scheme: dark) {
    header {
        background-color: rgba(30, 41, 59, 0.95);
        box-shadow: 0 2px 20px rgba(0, 0, 0, 0.3);
        border-bottom: 1px solid var(--border-color);
    }
}

.header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-size: 1.8rem;
    font-weight: 800;
    font-family: var(--font-display);
    color: var(--primary-color);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    transition: all var(--transition-base);
    position: relative;
    z-index: 1;
}

.logo::before {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 0;
    height: 0;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
    opacity: 0;
    transition: all var(--transition-base);
    z-index: -1;
}

.logo:hover::before {
    width: 100%;
    height: 100%;
    opacity: 0.1;
}

.logo:hover {
    transform: translateY(-3px);
}

.logo i {
    font-size: 2rem;
    filter: drop-shadow(0 0 12px rgba(99, 102, 241, 0.3));
    transition: all var(--transition-base);
    animation: logoPulse 3s ease-in-out infinite;
}

@keyframes logoPulse {
    0%, 100% {
        transform: scale(1);
        filter: drop-shadow(0 0 12px rgba(99, 102, 241, 0.3));
    }
    50% {
        transform: scale(1.1);
        filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.6));
    }
}

.logo:hover i {
    filter: drop-shadow(0 0 20px rgba(99, 102, 241, 0.6));
    transform: scale(1.15) rotate(5deg);
    animation: none;
}

.logo span {
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    transition: all var(--transition-base);
}

/* 导航菜单 */
nav ul {
    list-style: none;
    display: flex;
    gap: var(--spacing-2xl);
    align-items: center;
}

nav ul li a {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    transition: all var(--transition-base);
    position: relative;
    padding: var(--spacing-sm) 0;
    font-family: var(--font-sans);
}

nav ul li a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 3px;
    bottom: 0;
    left: 0;
    background: var(--primary-gradient);
    transition: width var(--transition-base);
    border-radius: var(--radius-full);
}

nav ul li a:hover {
    color: var(--primary-color);
}

nav ul li a:hover::after {
    width: 100%;
}

/* 移动端菜单按钮 */
.menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all var(--transition-base);
    padding: var(--spacing-sm);
    border-radius: var(--radius-md);
}

.menu-toggle:hover {
    color: var(--primary-color);
    background-color: var(--border-light);
    transform: scale(1.1);
}

/* 主题切换按钮 */
.theme-toggle {
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.25rem;
    cursor: pointer;
    transition: all var(--transition-base);
    padding: var(--spacing-sm);
    border-radius: var(--radius-full);
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
}

.theme-toggle:hover {
    background-color: var(--border-light);
    color: var(--primary-color);
    transform: scale(1.1);
}

.theme-toggle i {
    transition: transform var(--transition-base);
}

body.dark-mode .theme-toggle i {
    transform: rotate(180deg);
}

/* 用户认证区域 */
.user-auth {
    display: flex;
    align-items: center;
    gap: var(--spacing-md);
}

.auth-link {
    color: var(--text-secondary);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    transition: all var(--transition-base);
    position: relative;
    overflow: hidden;
    background-color: transparent;
    border: 1px solid transparent;
    font-family: var(--font-sans);
}

.auth-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.1), transparent);
    transition: left var(--transition-slow);
}

.auth-link:hover::before {
    left: 100%;
}

.auth-link:hover {
    color: var(--primary-color);
    transform: translateY(-2px);
    border-color: var(--border-color);
    background-color: var(--surface-color);
}

.auth-link.register {
    background: var(--primary-gradient);
    color: #ffffff;
    font-weight: 600;
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.auth-link.register:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    box-shadow: var(--shadow-xl);
    transform: translateY(-3px);
    border-color: transparent;
}

/* 用户菜单 */
.user-menu {
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
}

.username {
    color: var(--primary-color);
    font-weight: 600;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    background-color: rgba(99, 102, 241, 0.1);
    transition: all var(--transition-base);
    font-size: 0.95rem;
    border: 1px solid rgba(99, 102, 241, 0.2);
    backdrop-filter: blur(8px);
    font-family: var(--font-sans);
}

.username:hover {
    background-color: rgba(99, 102, 241, 0.2);
    border-color: rgba(99, 102, 241, 0.4);
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.dropdown-menu {
    position: absolute;
    top: 110%;
    right: 0;
    background-color: var(--surface-color);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-sm) 0;
    min-width: 200px;
    box-shadow: var(--shadow-xl);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px) scale(0.95);
    transition: all var(--transition-base);
    z-index: 1001;
}

.user-menu:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

.dropdown-menu li {
    list-style: none;
    margin: 0;
}

.dropdown-menu li a {
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    color: var(--text-secondary);
    text-decoration: none;
    padding: var(--spacing-md) var(--spacing-lg);
    transition: all var(--transition-base);
    font-size: 0.95rem;
    border-radius: var(--radius-lg);
    font-family: var(--font-sans);
}

.dropdown-menu li a:hover {
    background-color: rgba(99, 102, 241, 0.1);
    color: var(--primary-color);
    transform: translateX(5px);
}

.dropdown-menu li a i {
    font-size: 1rem;
    width: 16px;
    text-align: center;
    color: var(--text-tertiary);
    transition: color var(--transition-base);
}

.dropdown-menu li a:hover i {
    color: var(--primary-color);
}

/* 英雄区域 */
.hero {
    background: linear-gradient(135deg, var(--surface-color) 0%, var(--background-color) 100%);
    color: var(--text-primary);
    padding: calc(var(--spacing-3xl) + 80px) var(--spacing-lg) var(--spacing-3xl);
    text-align: center;
    position: relative;
    overflow: hidden;
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

/* 暗色模式英雄区域 */
@media (prefers-color-scheme: dark) {
    .hero {
        background: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
        color: var(--text-primary);
    }
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 50%, rgba(99, 102, 241, 0.15) 0%, transparent 50%),
        radial-gradient(circle at 80% 20%, rgba(139, 92, 246, 0.12) 0%, transparent 50%),
        radial-gradient(circle at 40% 80%, rgba(99, 102, 241, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 60% 40%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
    animation: backgroundShift 15s ease-in-out infinite;
}

.hero::after {
    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" width="100" height="100" viewBox="0 0 100 100"><circle cx="50" cy="50" r="1" fill="%236366f1" opacity="0.1"/></svg>'),
        url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" width="150" height="150" viewBox="0 0 150 150"><rect x="25" y="25" width="100" height="100" fill="none" stroke="%238b5cf6" stroke-width="1" opacity="0.05" transform="rotate(45 75 75)"/></svg>');
    animation: float 12s ease-in-out infinite;
}

/* 装饰线条 */
.hero .decorative-lines {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 1;
}

.hero .decorative-line {
    position: absolute;
    background: linear-gradient(90deg, transparent, rgba(99, 102, 241, 0.2), transparent);
    height: 2px;
    animation: lineMove 10s linear infinite;
}

.hero .decorative-line:nth-child(1) {
    top: 20%;
    width: 100%;
    animation-delay: 0s;
}

.hero .decorative-line:nth-child(2) {
    top: 40%;
    width: 100%;
    animation-delay: -3s;
    background: linear-gradient(90deg, transparent, rgba(139, 92, 246, 0.2), transparent);
}

.hero .decorative-line:nth-child(3) {
    top: 60%;
    width: 100%;
    animation-delay: -6s;
}

.hero .decorative-line:nth-child(4) {
    top: 80%;
    width: 100%;
    animation-delay: -9s;
    background: linear-gradient(90deg, transparent, rgba(139, 92, 246, 0.2), transparent);
}

@keyframes lineMove {
    0% { transform: translateX(-100%); }
    100% { transform: translateX(100%); }
}

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

@keyframes float {
    0%, 100% {
        transform: translateY(0) rotate(0deg);
    }
    50% {
        transform: translateY(-30px) rotate(180deg);
    }
}

.hero-content {
    position: relative;
    z-index: 1;
    max-width: 900px;
    margin: 0 auto;
}

.hero h1 {
    font-size: clamp(2.5rem, 8vw, 4.5rem);
    margin-bottom: var(--spacing-xl);
    font-weight: 800;
    line-height: 1.1;
    background: var(--primary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    font-family: var(--font-display);
    animation: heroTextSlideUp 1s ease-out;
    letter-spacing: -0.02em;
}

@keyframes heroTextSlideUp {
    from {
        opacity: 0;
        transform: translateY(50px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.hero h1 span {
    background: var(--secondary-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    display: inline-block;
    animation: heroSpanGlow 2s ease-in-out infinite alternate;
}

@keyframes heroSpanGlow {
    from {
        filter: drop-shadow(0 0 10px rgba(236, 72, 153, 0.3));
    }
    to {
        filter: drop-shadow(0 0 20px rgba(236, 72, 153, 0.6));
    }
}

.hero p {
    font-size: clamp(1rem, 2vw, 1.3rem);
    margin-bottom: var(--spacing-2xl);
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
    opacity: 0.9;
    color: var(--text-secondary);
    font-weight: 400;
    animation: heroTextSlideUp 1s ease-out 0.2s both;
    font-family: var(--font-sans);
    line-height: 1.8;
}

.cta-button {
    display: inline-block;
    background: var(--primary-gradient);
    background-size: 200% auto;
    color: #ffffff;
    padding: var(--spacing-lg) var(--spacing-2xl);
    border-radius: var(--radius-full);
    text-decoration: none;
    font-weight: 700;
    font-size: 1.1rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    position: relative;
    overflow: hidden;
    animation: heroButtonSlideUp 1s ease-out 0.4s both, gradientPulse 2s ease infinite;
    border: none;
    cursor: pointer;
    font-family: var(--font-display);
    letter-spacing: 0.02em;
    text-transform: uppercase;
}

@keyframes heroButtonSlideUp {
    from {
        opacity: 0;
        transform: translateY(30px) scale(0.9);
    }
    to {
        opacity: 1;
        transform: translateY(0) scale(1);
    }
}

@keyframes gradientPulse {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}

.cta-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left var(--transition-base);
}

.cta-button:hover::before {
    left: 100%;
}

.cta-button:hover {
    background: var(--secondary-gradient);
    transform: translateY(-4px) scale(1.05);
    box-shadow: var(--shadow-2xl);
    animation: gradientPulse 1s ease infinite;
}

.cta-button:active {
    transform: translateY(-2px) scale(1.02);
}

/* 服务区域 */
.services {
    padding: var(--spacing-3xl) 0;
    background-color: var(--surface-color);
    position: relative;
}

/* 暗色模式服务区域 */
@media (prefers-color-scheme: dark) {
    .services {
        background-color: var(--background-color);
    }
}

.services::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(180deg, var(--background-color) 0%, var(--surface-color) 100%);
}

/* 暗色模式服务区域渐变 */
@media (prefers-color-scheme: dark) {
    .services::before {
        background: linear-gradient(180deg, #0f172a 0%, #1e293b 100%);
    }
}

.section-title {
    text-align: center;
    margin-bottom: var(--spacing-3xl);
    position: relative;
}

.section-title h2 {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    font-weight: 800;
    margin-bottom: var(--spacing-lg);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    font-family: var(--font-display);
    letter-spacing: -0.02em;
}

/* 暗色模式标题 */
@media (prefers-color-scheme: dark) {
    .section-title h2 {
        color: var(--text-primary);
    }
}

.section-title h2::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 50%;
    transform: translateX(-50%);
    width: 80px;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
}

.section-title p {
    font-size: clamp(1rem, 2vw, 1.2rem);
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
    font-weight: 400;
    font-family: var(--font-sans);
    line-height: 1.7;
}

.services-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-2xl);
    margin-top: var(--spacing-xl);
}

.service-card {
    background: var(--surface-color);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    text-align: center;
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-sm);
    position: relative;
    overflow: hidden;
}

/* 暗色模式服务卡片 */
@media (prefers-color-scheme: dark) {
    .service-card {
        background: var(--surface-color);
        border: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
    }
}

.service-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
    background-size: 200% auto;
    transform: scaleX(0);
    transition: transform var(--transition-base);
    animation: gradientFlow 2s linear infinite;
}

.service-card:hover::before {
    transform: scaleX(1);
}

.service-card:hover {
    transform: translateY(-12px) scale(1.02);
    box-shadow: var(--shadow-xl);
    border-color: var(--primary-color);
}

@keyframes gradientFlow {
    0% { background-position: 0% 50%; }
    100% { background-position: 200% 50%; }
}

.service-icon {
    width: 80px;
    height: 80px;
    background: var(--primary-gradient);
    color: #ffffff;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin: 0 auto var(--spacing-lg);
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
    position: relative;
    z-index: 1;
    animation: iconFloat 3s ease-in-out infinite;
}

.service-card:hover .service-icon {
    background: var(--secondary-gradient);
    transform: scale(1.2) rotate(10deg);
    box-shadow: var(--shadow-lg);
    animation: none;
}

@keyframes iconFloat {
    0%, 100% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
}

.service-card h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: var(--spacing-md);
    color: var(--text-primary);
    transition: color var(--transition-base);
    font-family: var(--font-display);
}

/* 暗色模式服务标题 */
@media (prefers-color-scheme: dark) {
    .service-card h3 {
        color: var(--text-primary);
    }
}

.service-card:hover h3 {
    color: var(--primary-color);
}

.service-card p {
    color: var(--text-secondary);
    line-height: 1.7;
    font-size: 1rem;
    transition: color var(--transition-base);
    font-family: var(--font-sans);
    margin-bottom: var(--spacing-lg);
}

.service-card:hover p {
    color: var(--text-primary);
}

/* 项目展示 */
.projects {
    padding: var(--spacing-3xl) 0;
    background-color: var(--background-color);
    position: relative;
}

/* 卡片按钮组 */
.card-button-group {
    margin-top: var(--spacing-xl);
    display: flex;
    justify-content: center;
    gap: var(--spacing-md);
}

/* 关于我们 */
.about {
    padding: var(--spacing-3xl) 0;
    background-color: var(--background-color);
    position: relative;
}

/* 暗色模式关于我们 */
@media (prefers-color-scheme: dark) {
    .about {
        background-color: var(--background-color);
    }
}

.about::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 100px;
    background: linear-gradient(180deg, var(--surface-color) 0%, var(--background-color) 100%);
}

/* 暗色模式关于我们渐变 */
@media (prefers-color-scheme: dark) {
    .about::before {
        background: linear-gradient(180deg, #1e293b 0%, #0f172a 100%);
    }
}

.about-content {
    display: flex;
    align-items: center;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
    justify-content: center;
}

.about-text {
    flex: 1;
    min-width: 300px;
    max-width: 600px;
}

.about-text h2 {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    font-weight: 800;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    font-family: var(--font-display);
    letter-spacing: -0.02em;
}

/* 暗色模式关于我们标题 */
@media (prefers-color-scheme: dark) {
    .about-text h2 {
        color: var(--text-primary);
    }
}

.about-text h2::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 0;
    width: 80px;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
}

.about-text p {
    font-size: 1.15rem;
    line-height: 1.8;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-lg);
    font-weight: 400;
    font-family: var(--font-sans);
}

.about-image {
    flex: 1;
    min-width: 300px;
    max-width: 500px;
    position: relative;
}

.about-image::before {
    content: '';
    position: absolute;
    top: -20px;
    left: -20px;
    width: 100%;
    height: 100%;
    background: var(--primary-gradient);
    border-radius: var(--radius-xl);
    z-index: -1;
    transition: all var(--transition-base);
}

.about-image:hover::before {
    transform: translate(-10px, -10px) scale(1.05);
    box-shadow: var(--shadow-xl);
}

.about-image img {
    width: 100%;
    height: auto;
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

.about-image:hover img {
    transform: scale(1.02);
}

/* 联系我们 */
.contact {
    padding: var(--spacing-3xl) 0;
    background-color: var(--surface-color);
    position: relative;
}

/* 暗色模式联系我们 */
@media (prefers-color-scheme: dark) {
    .contact {
        background-color: var(--background-color);
    }
}

.contact-content {
    display: flex;
    gap: var(--spacing-3xl);
    flex-wrap: wrap;
    justify-content: center;
}

.contact-info {
    flex: 1;
    min-width: 300px;
    max-width: 600px;
}

.contact-info h2 {
    font-size: clamp(1.8rem, 5vw, 2.8rem);
    font-weight: 800;
    margin-bottom: var(--spacing-xl);
    color: var(--text-primary);
    position: relative;
    display: inline-block;
    font-family: var(--font-display);
    letter-spacing: -0.02em;
}

/* 暗色模式联系我们标题 */
@media (prefers-color-scheme: dark) {
    .contact-info h2 {
        color: var(--text-primary);
    }
}

.contact-info h2::after {
    content: '';
    position: absolute;
    bottom: -12px;
    left: 0;
    width: 80px;
    height: 4px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
}

.contact-item {
    display: flex;
    align-items: flex-start;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background-color: var(--background-color);
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
    border: 1px solid var(--border-color);
}

/* 暗色模式联系项 */
@media (prefers-color-scheme: dark) {
    .contact-item {
        background-color: var(--surface-color);
        border: 1px solid var(--border-color);
    }
}

.contact-item:hover {
    background-color: var(--surface-color);
    border-color: var(--primary-color);
    box-shadow: var(--shadow-lg);
    transform: translateY(-4px);
}

.contact-icon {
    width: 60px;
    height: 60px;
    background: var(--primary-gradient);
    color: #ffffff;
    border-radius: var(--radius-full);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-right: var(--spacing-lg);
    flex-shrink: 0;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-md);
}

.contact-item:hover .contact-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: var(--shadow-lg);
}

.contact-details h3 {
    font-size: 1.25rem;
    font-weight: 700;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
    font-family: var(--font-display);
}

/* 暗色模式联系标题 */
@media (prefers-color-scheme: dark) {
    .contact-details h3 {
        color: var(--text-primary);
    }
}

.contact-details p {
    color: var(--text-secondary);
    font-size: 1rem;
    line-height: 1.6;
    font-family: var(--font-sans);
}

.contact-form {
    flex: 1;
    min-width: 300px;
    max-width: 600px;
    background-color: var(--background-color);
    padding: var(--spacing-2xl);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
}

/* 暗色模式联系表单 */
@media (prefers-color-scheme: dark) {
    .contact-form {
        background-color: var(--surface-color);
        border: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
    }
}

.form-group {
    margin-bottom: var(--spacing-xl);
}

.form-group label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-weight: 600;
    color: var(--text-primary);
    font-size: 0.95rem;
    font-family: var(--font-sans);
}

/* 暗色模式标签 */
@media (prefers-color-scheme: dark) {
    .form-group label {
        color: var(--text-primary);
    }
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: var(--spacing-lg);
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    font-size: 1rem;
    transition: all var(--transition-base);
    background-color: var(--surface-color);
    font-family: var(--font-sans);
    color: var(--text-primary);
    box-shadow: var(--shadow-sm);
}

/* 暗色模式输入框 */
@media (prefers-color-scheme: dark) {
    .form-group input,
    .form-group textarea {
        background-color: var(--background-color);
        border: 1px solid var(--border-color);
        color: var(--text-primary);
    }
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
    transform: translateY(-2px);
}

.form-group textarea {
    resize: vertical;
    min-height: 180px;
    line-height: 1.6;
}

.submit-button {
    background: var(--primary-gradient);
    color: #ffffff;
    padding: var(--spacing-lg) var(--spacing-2xl);
    border: none;
    border-radius: var(--radius-full);
    font-size: 1.1rem;
    font-weight: 700;
    cursor: pointer;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-lg);
    width: 100%;
    position: relative;
    overflow: hidden;
    font-family: var(--font-display);
    text-transform: uppercase;
    letter-spacing: 0.02em;
}

.submit-button::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.3), transparent);
    transition: left var(--transition-slow);
}

.submit-button:hover::before {
    left: 100%;
}

.submit-button:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    transform: translateY(-3px);
    box-shadow: var(--shadow-xl);
}

/* 页脚 */
footer {
    background: linear-gradient(135deg, var(--text-primary) 0%, #0f172a 100%);
    color: #ffffff;
    padding: var(--spacing-3xl) 0 var(--spacing-xl);
    position: relative;
    overflow: hidden;
}

footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 4px;
    background: var(--primary-gradient);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: var(--spacing-2xl);
    margin-bottom: var(--spacing-2xl);
    position: relative;
    z-index: 1;
}

.footer-logo {
    min-width: 250px;
}

.footer-logo h3 {
    font-size: 2rem;
    font-weight: 800;
    color: var(--primary-color);
    margin-bottom: var(--spacing-lg);
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-display);
}

.footer-logo h3 i {
    font-size: 2.2rem;
    filter: drop-shadow(0 0 10px rgba(99, 102, 241, 0.5));
}

.footer-logo p {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    font-size: 1rem;
    margin-bottom: var(--spacing-lg);
    font-family: var(--font-sans);
}

.social-links {
    display: flex;
    gap: var(--spacing-md);
}

.social-links a {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    background: rgba(255, 255, 255, 0.1);
    color: #ffffff;
    border-radius: var(--radius-full);
    text-decoration: none;
    font-size: 1.2rem;
    transition: all var(--transition-base);
    box-shadow: var(--shadow-sm);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.social-links a:hover {
    background: var(--primary-gradient);
    color: #ffffff;
    transform: translateY(-4px) scale(1.1);
    box-shadow: var(--shadow-md);
    border-color: transparent;
}

.footer-links {
    min-width: 200px;
}

.footer-links h4 {
    font-size: 1.3rem;
    font-weight: 700;
    margin-bottom: var(--spacing-lg);
    color: #ffffff;
    position: relative;
    display: inline-block;
    font-family: var(--font-display);
}

.footer-links h4::after {
    content: '';
    position: absolute;
    bottom: -8px;
    left: 0;
    width: 40px;
    height: 3px;
    background: var(--primary-gradient);
    border-radius: var(--radius-full);
}

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

.footer-links ul li {
    margin-bottom: var(--spacing-md);
}

.footer-links ul li a {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    transition: all var(--transition-base);
    font-size: 0.95rem;
    display: flex;
    align-items: center;
    gap: var(--spacing-sm);
    font-family: var(--font-sans);
}

.footer-links ul li a:hover {
    color: var(--primary-color);
    transform: translateX(8px);
}

.footer-links ul li a i {
    font-size: 0.8rem;
    opacity: 0;
    transition: all var(--transition-base);
}

.footer-links ul li a:hover i {
    opacity: 1;
    transform: translateX(4px);
    color: var(--primary-color);
}

.footer-bottom {
    text-align: center;
    padding-top: var(--spacing-xl);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.6);
    position: relative;
    z-index: 1;
}

.footer-bottom p {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
    font-family: var(--font-sans);
}

.footer-bottom p {
    font-size: 0.9rem;
    margin-bottom: var(--spacing-sm);
}

.copyright-info {
    font-size: 0.8rem;
    opacity: 0.7;
    margin-top: var(--spacing-sm);
    font-family: var(--font-sans);
}

/* 响应式设计 */
@media (max-width: 768px) {
    /* 导航菜单 */
    nav ul {
        position: fixed;
        top: 80px;
        left: 0;
        right: 0;
        background: var(--surface-color);
        backdrop-filter: blur(10px);
        -webkit-backdrop-filter: blur(10px);
        flex-direction: column;
        align-items: center;
        padding: var(--spacing-xl) 0;
        box-shadow: var(--shadow-xl);
        transform: translateY(-150%);
        transition: transform var(--transition-base);
        z-index: 999;
        border-bottom: 1px solid var(--border-color);
        gap: var(--spacing-md);
    }

    /* 暗色模式移动端菜单 */
    @media (prefers-color-scheme: dark) {
        nav ul {
            background: rgba(30, 41, 59, 0.98);
            border-bottom: 1px solid var(--border-color);
        }
    }

    nav ul.active {
        transform: translateY(0);
    }

    nav ul li {
        margin: var(--spacing-xs) 0;
    }

    nav ul li a {
        font-size: 1rem;
        padding: var(--spacing-lg) var(--spacing-2xl);
    }

    .menu-toggle {
        display: block;
    }

    /* 用户认证区域 */
    .user-auth {
        gap: var(--spacing-xs);
    }

    .auth-link {
        padding: var(--spacing-xs) var(--spacing-md);
        font-size: 0.9rem;
    }

    /* 英雄区域 */
    .hero {
        padding: calc(var(--spacing-3xl) + 60px) var(--spacing-md) var(--spacing-2xl);
        min-height: auto;
    }

    .hero-content {
        padding: 0 var(--spacing-sm);
    }

    /* 服务区域 */
    .services {
        padding: var(--spacing-2xl) 0;
    }

    .services-grid {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        padding: 0 var(--spacing-md);
    }

    /* 关于我们 */
    .about {
        padding: var(--spacing-2xl) 0;
    }

    .about-content {
        flex-direction: column;
        text-align: center;
        gap: var(--spacing-2xl);
        padding: 0 var(--spacing-md);
    }

    .about-text h2::after {
        left: 50%;
        transform: translateX(-50%);
    }

    /* 联系我们 */
    .contact {
        padding: var(--spacing-2xl) 0;
    }

    .contact-content {
        flex-direction: column;
        gap: var(--spacing-2xl);
        padding: 0 var(--spacing-md);
    }

    .contact-form {
        padding: var(--spacing-xl);
    }

    /* 页脚 */
    footer {
        padding: var(--spacing-2xl) 0 var(--spacing-lg);
    }

    .footer-content {
        grid-template-columns: 1fr;
        gap: var(--spacing-xl);
        padding: 0 var(--spacing-md);
        text-align: center;
    }

    .social-links {
        justify-content: center;
    }
}

@media (max-width: 480px) {
    /* 头部 */
    .header-container {
        padding: 0 var(--spacing-md);
    }

    .logo {
        font-size: 1.5rem;
    }

    .logo i {
        font-size: 1.8rem;
    }

    /* 英雄区域 */
    .hero {
        padding: calc(var(--spacing-2xl) + 60px) var(--spacing-md) var(--spacing-xl);
    }

    .cta-button {
        padding: var(--spacing-md) var(--spacing-xl);
        font-size: 1rem;
    }

    /* 服务卡片 */
    .service-card {
        padding: var(--spacing-xl) var(--spacing-md);
    }

    .service-icon {
        width: 60px;
        height: 60px;
        font-size: 1.5rem;
    }

    /* 联系表单 */
    .form-group input,
    .form-group textarea {
        padding: var(--spacing-md);
    }

    /* 页脚 */
    .footer-content {
        gap: var(--spacing-lg);
    }

    .footer-logo h3 {
        font-size: 1.8rem;
    }

    .footer-logo h3 i {
        font-size: 2rem;
    }
}

/* 滚动动画 */
.fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity var(--transition-slow), transform var(--transition-slow);
}

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

/* 卡片悬停效果 */
.card-hover {
    transition: all var(--transition-base);
}

.card-hover:hover {
    transform: translateY(-8px);
    box-shadow: var(--shadow-xl);
}

/* 按钮基础样式 */
.btn {
    display: inline-block;
    padding: var(--spacing-sm) var(--spacing-lg);
    border-radius: var(--radius-full);
    font-weight: 600;
    text-decoration: none;
    transition: all var(--transition-base);
    border: none;
    cursor: pointer;
    font-family: var(--font-sans);
    font-size: 0.95rem;
    position: relative;
    overflow: hidden;
}

.btn-primary {
    background: var(--primary-gradient);
    color: #ffffff;
    box-shadow: var(--shadow-md);
}

.btn-primary:hover {
    background: linear-gradient(135deg, var(--primary-dark), var(--primary-color));
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-secondary {
    background: var(--secondary-gradient);
    color: #ffffff;
    box-shadow: var(--shadow-md);
}

.btn-secondary:hover {
    background: linear-gradient(135deg, var(--secondary-dark), var(--secondary-color));
    box-shadow: var(--shadow-lg);
    transform: translateY(-2px);
}

.btn-outline {
    background: transparent;
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.btn-outline:hover {
    background: var(--primary-gradient);
    color: #ffffff;
    border-color: transparent;
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

/* 输入框焦点样式 */
input:focus,
textarea:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.1);
}

/* 卡片样式 */
.card {
    background: var(--surface-color);
    border-radius: var(--radius-xl);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-color);
    transition: all var(--transition-base);
}

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

/* 标题样式 */
h1, h2, h3, h4, h5, h6 {
    font-family: var(--font-display);
    font-weight: 700;
    color: var(--text-primary);
    margin-bottom: var(--spacing-md);
    line-height: 1.2;
}

h1 {
    font-size: 2.5rem;
}

h2 {
    font-size: 2rem;
}

h3 {
    font-size: 1.5rem;
}

h4 {
    font-size: 1.25rem;
}

h5 {
    font-size: 1.125rem;
}

h6 {
    font-size: 1rem;
}

/* 段落样式 */
p {
    font-family: var(--font-sans);
    line-height: 1.7;
    color: var(--text-secondary);
    margin-bottom: var(--spacing-md);
}

/* 列表样式 */
ul, ol {
    margin-bottom: var(--spacing-md);
    padding-left: var(--spacing-lg);
}

li {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
    font-family: var(--font-sans);
}

/* 链接样式 */
a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color var(--transition-base);
    font-family: var(--font-sans);
}

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

/* 图片样式 */
img {
    max-width: 100%;
    height: auto;
    border-radius: var(--radius-lg);
    transition: all var(--transition-base);
}

img:hover {
    transform: scale(1.02);
}

/* 分隔线样式 */
hr {
    border: none;
    height: 1px;
    background-color: var(--border-color);
    margin: var(--spacing-xl) 0;
}

/* 加载动画 */
@keyframes spin {
    0% { transform: rotate(0deg); }
    100% { transform: rotate(360deg); }
}

.loading {
    animation: spin 1s linear infinite;
}

/* 淡入淡出动画 */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.fade-in-animation {
    animation: fadeIn 0.5s ease-in;
}

/* 脉冲动画 */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.pulse-animation {
    animation: pulse 2s cubic-bezier(0.4, 0, 0.6, 1) infinite;
}

/* 滑动动画 */
@keyframes slideInRight {
    from {
        transform: translateX(100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.slide-in-right {
    animation: slideInRight 0.5s ease-out;
}

@keyframes slideInLeft {
    from {
        transform: translateX(-100%);
        opacity: 0;
    }
    to {
        transform: translateX(0);
        opacity: 1;
    }
}

.slide-in-left {
    animation: slideInLeft 0.5s ease-out;
}