/* 基础重置和变量 - 暗黑模式 */
:root {
    /* 主色调 - 炫酷紫蓝渐变 */
    --primary-color: #8b5cf6;
    --secondary-color: #7c3aed;
    --accent-color: #a855f7;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    
    /* 文字颜色 */
    --text-primary: #f8fafc;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    --text-light: #ffffff;
    
    /* 背景颜色 */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: rgba(30, 41, 59, 0.8);
    --bg-glass: rgba(15, 23, 42, 0.9);
    --bg-overlay: rgba(0, 0, 0, 0.5);
    
    /* 边框和阴影 */
    --border-color: #334155;
    --border-light: #475569;
    --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.3);
    --shadow-medium: 0 10px 25px rgba(0, 0, 0, 0.4);
    --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.6);
    --shadow-glow: 0 0 20px rgba(139, 92, 246, 0.3);
    --shadow-card: 0 8px 32px rgba(0, 0, 0, 0.4);
    
    /* 渐变 */
    --gradient-primary: linear-gradient(135deg, #8b5cf6 0%, #7c3aed 50%, #6366f1 100%);
    --gradient-secondary: linear-gradient(135deg, #1e293b 0%, #334155 100%);
    --gradient-accent: linear-gradient(45deg, #8b5cf6, #a855f7, #c084fc);
    --gradient-dark: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #334155 100%);
    
    /* 其他 */
    --border-radius: 16px;
    --border-radius-small: 8px;
    --border-radius-large: 24px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
    --transition-fast: all 0.2s ease;
    --font-family: 'Noto Sans SC', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    
    /* 动画 */
    --animation-duration: 0.6s;
    --animation-easing: cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text-primary);
    background: var(--bg-primary);
    min-height: 100vh;
    overflow-x: hidden;
    position: relative;
}

/* 自定义背景容器 */
.custom-background {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -2;
    opacity: 0.8;
}

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

.custom-background.image {
    background-size: cover;
    background-position: center;
    background-repeat: no-repeat;
}

.custom-background.video video {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

/* 统一背景样式 */
.bg-animation {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    overflow: hidden;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 25%, #16213e 50%, #0f3460 75%, #0e4b99 100%);
}

.gradient-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 20% 20%, rgba(120, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(255, 119, 198, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 40% 40%, rgba(120, 219, 255, 0.2) 0%, transparent 50%);
    animation: backgroundShift 20s ease-in-out infinite;
    pointer-events: none;
}

@keyframes backgroundShift {
    0%, 100% { opacity: 1; transform: scale(1) rotate(0deg); }
    50% { opacity: 0.8; transform: scale(1.1) rotate(180deg); }
}

.floating-particles,
.floating-particles-2,
.floating-particles-3 {
    position: absolute;
    width: 100%;
    height: 100%;
}

.floating-particles::before,
.floating-particles::after {
    content: '';
    position: absolute;
    width: 600px;
    height: 600px;
    border-radius: 50%;
    background: 
        radial-gradient(circle at 30% 30%, rgba(0, 255, 255, 0.3) 0%, transparent 40%),
        radial-gradient(circle at 70% 70%, rgba(255, 0, 255, 0.2) 0%, transparent 40%);
    animation: fluidFloat 25s infinite ease-in-out;
    filter: blur(80px);
    mix-blend-mode: screen;
}

.floating-particles::before {
    top: 10%;
    left: 5%;
    animation-delay: 0s;
    animation-duration: 25s;
}

.floating-particles::after {
    top: 50%;
    right: 5%;
    animation-delay: -12s;
    animation-duration: 30s;
}

@keyframes fluidFloat {
    0% { 
        transform: translate(0px, 0px) rotate(0deg) scale(1); 
        opacity: 0.8;
    }
    20% { 
        transform: translate(100px, -50px) rotate(72deg) scale(1.3); 
        opacity: 1;
    }
    40% { 
        transform: translate(-50px, -100px) rotate(144deg) scale(0.8); 
        opacity: 0.6;
    }
    60% { 
        transform: translate(-100px, 50px) rotate(216deg) scale(1.1); 
        opacity: 0.9;
    }
    80% { 
        transform: translate(50px, 100px) rotate(288deg) scale(1.4); 
        opacity: 0.7;
    }
    100% { 
        transform: translate(0px, 0px) rotate(360deg) scale(1); 
        opacity: 0.8;
    }
}

/* 额外的粒子效果 */
.floating-particles-2::before,
.floating-particles-2::after {
    content: '';
    position: absolute;
    width: 400px;
    height: 400px;
    border-radius: 50%;
    background: 
        conic-gradient(from 0deg, 
            rgba(255, 255, 0, 0.2) 0deg,
            rgba(255, 0, 255, 0.2) 120deg,
            rgba(0, 255, 255, 0.2) 240deg,
            rgba(255, 255, 0, 0.2) 360deg);
    animation: fluidSpin 30s infinite linear;
    filter: blur(60px);
    mix-blend-mode: color-dodge;
}

.floating-particles-2::before {
    top: 30%;
    left: 70%;
    animation-delay: -5s;
}

.floating-particles-2::after {
    top: 70%;
    left: 20%;
    animation-delay: -20s;
}

@keyframes fluidSpin {
    0% { 
        transform: rotate(0deg) scale(1);
        opacity: 0.7;
    }
    50% { 
        transform: rotate(180deg) scale(1.5);
        opacity: 0.3;
    }
    100% { 
        transform: rotate(360deg) scale(1);
        opacity: 0.7;
    }
}

.floating-particles-3::before,
.floating-particles-3::after {
    content: '';
    position: absolute;
    width: 300px;
    height: 300px;
    border-radius: 50%;
    background: 
        linear-gradient(45deg, 
            rgba(0, 255, 255, 0.3) 0%,
            rgba(255, 255, 255, 0.1) 50%,
            rgba(255, 0, 255, 0.3) 100%);
    animation: fluidPulse 15s infinite ease-in-out;
    filter: blur(40px);
    mix-blend-mode: soft-light;
}

.floating-particles-3::before {
    top: 15%;
    right: 30%;
    animation-delay: -15s;
}

.floating-particles-3::after {
    bottom: 20%;
    left: 60%;
    animation-delay: -25s;
}

@keyframes fluidPulse {
    0%, 100% { 
        transform: scale(1) rotate(0deg);
        opacity: 0.6;
    }
    25% { 
        transform: scale(1.3) rotate(90deg);
        opacity: 0.9;
    }
    50% { 
        transform: scale(0.8) rotate(180deg);
        opacity: 0.3;
    }
    75% { 
        transform: scale(1.1) rotate(270deg);
        opacity: 0.7;
    }
}

/* 新增动画效果 */
@keyframes sparkle {
    0%, 100% { opacity: 0; transform: scale(0); }
    50% { opacity: 1; transform: scale(1); }
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

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

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.8);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@keyframes glow {
    0%, 100% { box-shadow: 0 0 20px rgba(102, 126, 234, 0.3); }
    50% { box-shadow: 0 0 40px rgba(102, 126, 234, 0.6); }
}

/* 未来感光线网格 */
.bg-animation::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        linear-gradient(90deg, rgba(0, 255, 255, 0.1) 1px, transparent 1px),
        linear-gradient(0deg, rgba(255, 0, 255, 0.1) 1px, transparent 1px);
    background-size: 100px 100px;
    animation: gridFlow 20s linear infinite;
    opacity: 0.3;
}

/* 流动的光束 */
.bg-animation::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(45deg, transparent 30%, rgba(0, 255, 255, 0.4) 50%, transparent 70%),
        linear-gradient(-45deg, transparent 30%, rgba(255, 0, 255, 0.4) 50%, transparent 70%);
    background-size: 200% 200%;
    animation: lightBeam 12s ease-in-out infinite;
    mix-blend-mode: screen;
}

@keyframes gridFlow {
    0% {
        transform: translate(0, 0);
        opacity: 0.3;
    }
    50% {
        transform: translate(-50px, -50px);
        opacity: 0.6;
    }
    100% {
        transform: translate(-100px, -100px);
        opacity: 0.3;
    }
}

@keyframes lightBeam {
    0%, 100% {
        background-position: 0% 0%, 100% 100%;
        opacity: 0.2;
    }
    50% {
        background-position: 100% 100%, 0% 0%;
        opacity: 0.8;
    }
}

/* 导航栏 */
.navbar {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: var(--bg-glass);
    backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--border-color);
    box-shadow: var(--shadow-medium);
    z-index: 1000;
    transition: var(--transition);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    height: 70px;
}

.nav-logo {
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary-color);
    text-decoration: none;
}

.nav-logo i {
    font-size: 1.8rem;
    background: linear-gradient(45deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 30px;
}

.nav-link {
    text-decoration: none;
    color: var(--text-secondary);
    font-weight: 500;
    padding: 10px 18px;
    border-radius: var(--border-radius-small);
    transition: var(--transition);
    position: relative;
}

.nav-link:hover,
.nav-link.active {
    color: var(--text-light);
    background: var(--gradient-primary);
    box-shadow: var(--shadow-glow);
    transform: translateY(-1px);
}

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

.hamburger span {
    width: 25px;
    height: 3px;
    background: var(--text-primary);
    border-radius: 2px;
    transition: var(--transition);
}

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

/* 英雄区域 - 重新设计 */
.hero {
    min-height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    padding: 40px 20px;
    position: relative;
    overflow: hidden;
}

.hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 30% 30%, rgba(139, 92, 246, 0.3) 0%, transparent 50%),
        radial-gradient(circle at 70% 70%, rgba(168, 85, 247, 0.2) 0%, transparent 50%),
        radial-gradient(circle at 50% 50%, rgba(99, 102, 241, 0.1) 0%, transparent 50%);
    animation: heroGlow 10s ease-in-out infinite;
    pointer-events: none;
}

@keyframes heroGlow {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.8; transform: scale(1.1); }
}

.hero-content {
    max-width: 900px;
    animation: fadeInUp 1.2s ease-out;
    position: relative;
    z-index: 2;
}

.hero-title {
    font-size: clamp(3rem, 6vw, 5rem);
    font-weight: 800;
    margin-bottom: 30px;
    line-height: 1.1;
    text-shadow: 0 4px 20px rgba(139, 92, 246, 0.3);
}

.title-line {
    display: block;
    margin-bottom: 10px;
}

.title-line:first-child {
    font-size: 0.7em;
    font-weight: 400;
    color: rgba(255, 255, 255, 0.8);
    text-transform: uppercase;
    letter-spacing: 3px;
    margin-bottom: 15px;
}

.gradient-text {
    background: linear-gradient(45deg, 
        #ffffff 0%, 
        #8b5cf6 25%, 
        #a855f7 50%, 
        #c084fc 75%, 
        #ffffff 100%);
    background-size: 200% 200%;
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: textShine 4s ease-in-out infinite;
    position: relative;
}

.gradient-text::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent, rgba(255, 255, 255, 0.1), transparent);
    animation: textGlow 3s ease-in-out infinite;
    pointer-events: none;
}

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

@keyframes textGlow {
    0%, 100% { opacity: 0; transform: translateX(-100%); }
    50% { opacity: 1; transform: translateX(100%); }
}

.hero-subtitle {
    font-size: 1.4rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 50px;
    font-weight: 300;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.3);
    animation: fadeInUp 1.5s ease-out 0.3s both;
}

.hero-buttons {
    display: flex;
    gap: 25px;
    justify-content: center;
    flex-wrap: wrap;
    animation: fadeInUp 1.8s ease-out 0.6s both;
}

/* 未来感按钮样式 */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 50px;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    backdrop-filter: blur(20px);
    background: rgba(255, 255, 255, 0.05);
    color: rgba(255, 255, 255, 0.9);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.btn-primary {
    background: 
        linear-gradient(135deg, rgba(0, 255, 255, 0.2) 0%, rgba(255, 0, 255, 0.2) 100%),
        rgba(255, 255, 255, 0.05);
    border: 1px solid rgba(0, 255, 255, 0.3);
    box-shadow: 
        0 8px 32px rgba(0, 255, 255, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    position: relative;
    overflow: hidden;
}

.btn-primary::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, 
        transparent, 
        rgba(255, 255, 255, 0.4), 
        transparent);
    transition: left 0.6s ease;
}

.btn-primary::after {
    content: '';
    position: absolute;
    inset: 0;
    border-radius: 50px;
    background: conic-gradient(from 0deg, 
        rgba(0, 255, 255, 0.3) 0deg,
        rgba(255, 0, 255, 0.3) 120deg,
        rgba(255, 255, 0, 0.3) 240deg,
        rgba(0, 255, 255, 0.3) 360deg);
    opacity: 0;
    transition: opacity 0.4s ease;
    z-index: -1;
}

.btn-primary:hover::before {
    left: 100%;
}

.btn-primary:hover::after {
    opacity: 1;
}

.btn-primary:hover {
    transform: translateY(-4px) scale(1.02);
    box-shadow: 
        0 16px 64px rgba(0, 255, 255, 0.4),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    border-color: rgba(255, 255, 255, 0.6);
}

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

.btn-outline:hover {
    background: var(--primary-color);
    color: var(--text-light);
}

/* 卡片区域 - 增强版 */
.cards-section {
    padding: 100px 20px;
    background: linear-gradient(135deg, rgba(0, 0, 0, 0.4) 0%, rgba(30, 41, 59, 0.3) 100%);
    backdrop-filter: blur(25px);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    position: relative;
    overflow: hidden;
}

.cards-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        radial-gradient(circle at 20% 20%, rgba(139, 92, 246, 0.1) 0%, transparent 50%),
        radial-gradient(circle at 80% 80%, rgba(168, 85, 247, 0.1) 0%, transparent 50%);
    animation: sectionGlow 12s ease-in-out infinite;
    pointer-events: none;
}

@keyframes sectionGlow {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.7; transform: scale(1.05); }
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

.section-title {
    text-align: center;
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 50px;
    color: var(--text-light);
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.section-title i {
    background: linear-gradient(45deg, var(--accent-color), #ffffff);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.cards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-bottom: 50px;
}

/* 未来感玻璃态卡片 */
.card {
    background: 
        linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%),
        rgba(0, 0, 0, 0.2);
    border-radius: 24px;
    padding: 32px;
    box-shadow: 
        0 8px 32px rgba(0, 0, 0, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.2);
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    position: relative;
    overflow: hidden;
    cursor: pointer;
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    animation: fadeInScale 0.6s ease-out;
}

.card::after {
    content: '点击访问';
    position: absolute;
    top: 16px;
    right: 16px;
    background: rgba(0, 255, 255, 0.2);
    color: rgba(255, 255, 255, 0.8);
    padding: 4px 12px;
    border-radius: 12px;
    font-size: 0.75rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    opacity: 0;
    transition: all 0.3s ease;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(0, 255, 255, 0.3);
}

.card:hover {
    transform: translateY(-20px) scale(1.03);
    box-shadow: 
        0 20px 60px rgba(0, 255, 255, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.4);
    border-color: rgba(0, 255, 255, 0.5);
}

.card:hover::after {
    opacity: 1;
    transform: translateY(-2px);
}

.card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: 
        conic-gradient(from 0deg at 50% 50%, 
            rgba(0, 255, 255, 0.1) 0deg,
            rgba(255, 0, 255, 0.1) 120deg,
            rgba(255, 255, 0, 0.1) 240deg,
            rgba(0, 255, 255, 0.1) 360deg);
    opacity: 0;
    transition: opacity 0.5s ease;
    border-radius: 24px;
}

.card:hover::before {
    opacity: 1;
}

.card-icon {
    width: 80px;
    height: 80px;
    border-radius: 20px;
    background: 
        linear-gradient(135deg, rgba(0, 255, 255, 0.2) 0%, rgba(255, 0, 255, 0.2) 100%),
        rgba(255, 255, 255, 0.1);
    display: flex;
    align-items: center;
    justify-content: center;
    margin-bottom: 24px;
    color: rgba(255, 255, 255, 0.9);
    font-size: 2rem;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    box-shadow: 
        0 8px 16px rgba(0, 0, 0, 0.2),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
    transition: all 0.4s ease;
    position: relative;
    z-index: 2;
}

.card:hover .card-icon {
    transform: scale(1.1) rotate(5deg);
    box-shadow: 
        0 12px 24px rgba(0, 255, 255, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.5);
}

.card-content h3 {
    font-size: 1.6rem;
    font-weight: 700;
    margin-bottom: 12px;
    color: rgba(255, 255, 255, 0.95);
    position: relative;
    z-index: 2;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.card-content p {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 24px;
    line-height: 1.7;
    font-size: 1rem;
    position: relative;
    z-index: 2;
}

.card-tags {
    display: flex;
    gap: 10px;
    flex-wrap: wrap;
    position: relative;
    z-index: 2;
}

.tag {
    background: 
        linear-gradient(135deg, rgba(0, 255, 255, 0.2) 0%, rgba(255, 0, 255, 0.2) 100%),
        rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.9);
    padding: 6px 16px;
    border-radius: 20px;
    font-size: 0.875rem;
    font-weight: 600;
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.2);
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.tag:hover {
    transform: scale(1.05);
    background: 
        linear-gradient(135deg, rgba(0, 255, 255, 0.4) 0%, rgba(255, 0, 255, 0.4) 100%),
        rgba(255, 255, 255, 0.2);
    box-shadow: 0 4px 12px rgba(0, 255, 255, 0.3);
}

.card-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(135deg, rgba(0, 255, 255, 0.95) 0%, rgba(255, 0, 255, 0.95) 100%),
        rgba(0, 0, 0, 0.8);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: all 0.5s cubic-bezier(0.4, 0, 0.2, 1);
    backdrop-filter: blur(20px);
    border-radius: 24px;
    pointer-events: none;
}

.card:hover .card-overlay {
    opacity: 1;
    pointer-events: auto;
}

.card-link {
    color: rgba(255, 255, 255, 0.95);
    text-decoration: none;
    font-size: 1.1rem;
    font-weight: 700;
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 16px 32px;
    border: 2px solid rgba(255, 255, 255, 0.3);
    border-radius: 50px;
    transition: all 0.4s ease;
    backdrop-filter: blur(20px);
    background: rgba(255, 255, 255, 0.1);
    text-transform: uppercase;
    letter-spacing: 1px;
    position: relative;
    overflow: hidden;
}

.card-link::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 0.5s ease;
}

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

.card-link:hover {
    background: rgba(255, 255, 255, 0.9);
    color: rgba(0, 0, 0, 0.9);
    border-color: rgba(255, 255, 255, 0.9);
    transform: scale(1.05);
    box-shadow: 0 8px 24px rgba(255, 255, 255, 0.3);
}

/* 未来感过滤器标签 */
.filter-tabs {
    display: flex;
    justify-content: center;
    gap: 20px;
    flex-wrap: wrap;
    margin-top: 20px;
}

.filter-btn {
    background: 
        linear-gradient(135deg, rgba(255, 255, 255, 0.1) 0%, rgba(255, 255, 255, 0.05) 100%),
        rgba(0, 0, 0, 0.2);
    color: rgba(255, 255, 255, 0.8);
    border: 1px solid rgba(255, 255, 255, 0.2);
    padding: 12px 24px;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    align-items: center;
    gap: 10px;
    font-weight: 600;
    backdrop-filter: blur(20px);
    text-transform: uppercase;
    letter-spacing: 1px;
    font-size: 0.9rem;
    position: relative;
    overflow: hidden;
}

.filter-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
    transition: left 0.5s ease;
}

.filter-btn:hover::before,
.filter-btn.active::before {
    left: 100%;
}

.filter-btn:hover,
.filter-btn.active {
    background: 
        linear-gradient(135deg, rgba(0, 255, 255, 0.3) 0%, rgba(255, 0, 255, 0.3) 100%),
        rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.95);
    border-color: rgba(0, 255, 255, 0.5);
    transform: translateY(-2px);
    box-shadow: 
        0 8px 24px rgba(0, 255, 255, 0.3),
        inset 0 1px 0 rgba(255, 255, 255, 0.3);
}

/* 关于区域 */
.about-section {
    padding: 80px 20px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
}

.about-content {
    max-width: 600px;
    margin: 0 auto;
    text-align: center;
}

.about-content p {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 20px;
    line-height: 1.8;
}

/* 页脚 */
.footer {
    background: rgba(0, 0, 0, 0.2);
    backdrop-filter: blur(10px);
    padding: 30px 20px;
    text-align: center;
    color: rgba(255, 255, 255, 0.8);
}

/* 动画 */
@keyframes fadeInUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .nav-menu {
        position: fixed;
        top: 70px;
        left: -100%;
        width: 100%;
        height: calc(100vh - 70px);
        background: rgba(255, 255, 255, 0.95);
        backdrop-filter: blur(10px);
        flex-direction: column;
        justify-content: flex-start;
        align-items: center;
        padding-top: 50px;
        transition: var(--transition);
    }

    .nav-menu.active {
        left: 0;
    }

    .hamburger {
        display: flex;
    }

    .hamburger.active span:nth-child(1) {
        transform: rotate(45deg) translate(5px, 5px);
    }

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

    .hamburger.active span:nth-child(3) {
        transform: rotate(-45deg) translate(7px, -6px);
    }

    .cards-grid {
        grid-template-columns: 1fr;
        gap: 20px;
    }

    .hero-buttons {
        flex-direction: column;
        align-items: center;
    }

    .filter-tabs {
        gap: 10px;
    }

    .filter-btn {
        padding: 8px 16px;
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .nav-container {
        padding: 0 15px;
    }

    .hero {
        padding: 20px 15px;
    }

    .cards-section,
    .about-section {
        padding: 60px 15px;
    }

    .card {
        padding: 20px;
    }

    .section-title {
        font-size: 2rem;
        margin-bottom: 30px;
    }
}