/* 现代化高级感设计 - AGI CLUB */

/* CSS变量定义 */
:root {
    --primary-gradient: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    --secondary-gradient: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
    --accent-gradient: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --glass-bg: rgba(255, 255, 255, 0.1);
    --glass-border: rgba(255, 255, 255, 0.2);
    --text-primary: #ffffff;
    --text-secondary: #b8c5d6;
    --text-accent: #4facfe;
    --shadow-light: 0 8px 32px rgba(31, 38, 135, 0.37);
    --shadow-heavy: 0 20px 60px rgba(0, 0, 0, 0.3);
    --border-radius: 16px;
    --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

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

html {
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background: linear-gradient(135deg, #0f0f23 0%, #1a1a2e 25%, #2d1b69 50%, #11998e 75%, #38ef7d 100%);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
    position: relative;
    min-height: 100vh;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

/* 粒子背景容器 */
#particles-js {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    pointer-events: none;
}

/* 浮动几何图形 */
.floating-shapes {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 2;
    pointer-events: none;
}

.shape {
    position: absolute;
    border-radius: 50%;
    background: var(--accent-gradient);
    opacity: 0.1;
    animation: float 20s infinite linear;
}

.shape-1 {
    width: 80px;
    height: 80px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.shape-2 {
    width: 120px;
    height: 120px;
    top: 60%;
    right: 15%;
    animation-delay: -5s;
}

.shape-3 {
    width: 60px;
    height: 60px;
    top: 80%;
    left: 70%;
    animation-delay: -10s;
}

.shape-4 {
    width: 100px;
    height: 100px;
    top: 30%;
    right: 30%;
    animation-delay: -15s;
}

.shape-5 {
    width: 140px;
    height: 140px;
    top: 10%;
    left: 60%;
    animation-delay: -20s;
}

@keyframes float {
    0%, 100% {
        transform: translateY(0px) rotate(0deg);
    }
    33% {
        transform: translateY(-30px) rotate(120deg);
    }
    66% {
        transform: translateY(30px) rotate(240deg);
    }
}

/* 星空背景 */
body::before {
    content: '';
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-image: 
        radial-gradient(2px 2px at 20px 30px, #eee, transparent),
        radial-gradient(2px 2px at 40px 70px, rgba(255,255,255,0.8), transparent),
        radial-gradient(1px 1px at 90px 40px, #fff, transparent),
        radial-gradient(1px 1px at 130px 80px, rgba(255,255,255,0.6), transparent),
        radial-gradient(2px 2px at 160px 30px, #fff, transparent);
    background-repeat: repeat;
    background-size: 200px 100px;
    animation: sparkle 20s linear infinite;
    pointer-events: none;
    z-index: 1;
}

@keyframes sparkle {
    from { transform: translateX(0); }
    to { transform: translateX(200px); }
}

/* 流星动画 */
.meteor {
    position: fixed;
    top: -5px;
    width: 2px;
    height: 2px;
    background: linear-gradient(45deg, #fff, transparent);
    border-radius: 50%;
    box-shadow: 0 0 6px 2px rgba(255, 255, 255, 0.8);
    animation: meteor 3s linear infinite;
    pointer-events: none;
    z-index: 2;
}

.meteor::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 50px;
    height: 1px;
    background: linear-gradient(45deg, rgba(255, 255, 255, 0.8), transparent);
    transform: rotate(45deg);
    transform-origin: 0 0;
}

@keyframes meteor {
    0% {
        transform: translateX(-100px) translateY(-100px);
        opacity: 1;
    }
    70% {
        opacity: 1;
    }
    100% {
        transform: translateX(calc(100vw + 100px)) translateY(calc(100vh + 100px));
        opacity: 0;
    }
}

.meteor:nth-child(1) {
    left: 10%;
    animation-delay: 0s;
    animation-duration: 3s;
}

.meteor:nth-child(2) {
    left: 30%;
    animation-delay: 2s;
    animation-duration: 2.5s;
}

.meteor:nth-child(3) {
    left: 50%;
    animation-delay: 4s;
    animation-duration: 3.5s;
}

.meteor:nth-child(4) {
    left: 70%;
    animation-delay: 6s;
    animation-duration: 2.8s;
}

.meteor:nth-child(5) {
    left: 90%;
    animation-delay: 8s;
    animation-duration: 3.2s;
}

/* 闪烁的AGI CLUB背景文字 */
.background-text {
    position: fixed;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    font-size: 15vw;
    font-weight: 900;
    color: rgba(255, 255, 255, 0.03);
    z-index: 5;
    pointer-events: none;
    user-select: none;
    text-transform: uppercase;
    animation: cyberpunk-flicker 4s linear infinite;
}

@keyframes cyberpunk-flicker {
    0% {
        opacity: 0.1;
        text-shadow: 0 0 10px #4facfe, 0 0 20px #4facfe;
    }
    3% {
        opacity: 1;
        text-shadow: 0 0 10px #4facfe, 0 0 25px #4facfe, 0 0 50px #4facfe;
    }
    4% {
        opacity: 0.2;
        text-shadow: 0 0 10px #4facfe, 0 0 20px #4facfe;
    }
    5% {
        opacity: 1;
        text-shadow: 0 0 10px #4facfe, 0 0 25px #4facfe, 0 0 50px #4facfe;
    }
    10% {
        opacity: 0.3;
        text-shadow: 0 0 10px #4facfe, 0 0 20px #4facfe;
    }
    10.5% {
        opacity: 1;
        text-shadow: 0 0 10px #4facfe, 0 0 25px #4facfe, 0 0 50px #4facfe;
    }
    30% {
        opacity: 1;
        text-shadow: 0 0 10px #4facfe, 0 0 25px #4facfe, 0 0 50px #4facfe;
    }
    30.1% {
        opacity: 0.1;
        text-shadow: 0 0 10px #4facfe, 0 0 20px #4facfe;
    }
    30.5% {
        opacity: 0.1;
        text-shadow: 0 0 10px #4facfe, 0 0 20px #4facfe;
    }
    30.6% {
        opacity: 1;
        text-shadow: 0 0 10px #4facfe, 0 0 25px #4facfe, 0 0 50px #4facfe;
    }
    100% {
        opacity: 1;
        text-shadow: 0 0 10px #4facfe, 0 0 25px #4facfe, 0 0 50px #4facfe;
    }
}

/* 容器样式 */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* 导航栏 */
header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    z-index: 1000;
    padding: 1rem 2rem;
    background: rgba(12, 12, 12, 0.8);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border-bottom: 1px solid var(--glass-border);
    transition: var(--transition);
}

header.scrolled {
    background: rgba(12, 12, 12, 0.95);
    backdrop-filter: blur(30px);
    -webkit-backdrop-filter: blur(30px);
    padding: 0.8rem 2rem;
    box-shadow: var(--shadow-light);
}

.main-nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1400px;
    margin: 0 auto;
    height: 60px;
    position: relative;
}

/* 左侧Logo区域 */
.nav-left {
    display: flex;
    align-items: center;
    flex: 0 0 auto;
}

.logo-container {
    perspective: 200px;
}

.logo-cube {
    position: relative;
    width: 45px;
    height: 45px;
    transform-style: preserve-3d;
    animation: rotateCube 8s infinite linear;
    cursor: pointer;
}

.cube-face {
    position: absolute;
    width: 45px;
    height: 45px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    font-size: 16px;
    background: var(--accent-gradient);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    border-radius: 4px;
}

.cube-face.front { transform: rotateY(0deg) translateZ(22.5px); }
.cube-face.back { transform: rotateY(180deg) translateZ(22.5px); }
.cube-face.right { transform: rotateY(90deg) translateZ(22.5px); }
.cube-face.left { transform: rotateY(-90deg) translateZ(22.5px); }
.cube-face.top { transform: rotateX(90deg) translateZ(22.5px); }
.cube-face.bottom { transform: rotateX(-90deg) translateZ(22.5px); }

@keyframes rotateCube {
    0% { transform: rotateX(0deg) rotateY(0deg); }
    100% { transform: rotateX(360deg) rotateY(360deg); }
}

/* 中间标语区域 */
.nav-center {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 2rem;
}

.nav-slogan {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.slogan-main {
    font-size: 18px;
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    letter-spacing: 0.5px;
}

.slogan-sub {
    font-size: 11px;
    color: var(--text-secondary);
    opacity: 0.8;
    font-weight: 400;
}

/* 右下角导航区域 */
.nav-right {
    display: flex;
    align-items: flex-end;
    flex: 0 0 auto;
    position: relative;
    top: 8px;
}

.nav-menu {
    list-style: none;
    display: flex;
    gap: 1rem;
    margin: 0;
    padding: 0;
}

.nav-item {
    position: relative;
}

.nav-link {
    display: flex;
    align-items: center;
    gap: 0.4rem;
    color: var(--text-primary);
    text-decoration: none;
    font-weight: 500;
    padding: 0.6rem 1rem;
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border: 1px solid transparent;
    transition: var(--transition);
    font-size: 13px;
}

.nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--glass-border);
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.nav-icon {
    font-size: 14px;
}

.nav-text {
    font-size: 13px;
}

/* 下拉菜单 */
.dropdown {
    position: relative;
}

.dropdown-menu {
    position: absolute;
    top: 100%;
    right: 0;
    min-width: 160px;
    background: rgba(12, 12, 12, 0.95);
    backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    padding: 0.5rem 0;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: var(--transition);
    box-shadow: var(--shadow-heavy);
    z-index: 1001;
}

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

.dropdown-item {
    display: block;
    padding: 0.6rem 1rem;
    color: var(--text-primary);
    text-decoration: none;
    transition: var(--transition);
    font-size: 13px;
}

.dropdown-item:hover {
    background: rgba(255, 255, 255, 0.1);
}

.dropdown-divider {
    height: 1px;
    background: rgba(255, 255, 255, 0.1);
    margin: 0.5rem 0;
}

.admin-item {
    background: rgba(118, 75, 162, 0.1);
    border: 1px solid rgba(118, 75, 162, 0.2);
    border-radius: 6px;
    margin: 0.25rem 0.5rem;
    font-weight: 600;
}

.admin-item:hover {
    background: rgba(118, 75, 162, 0.2);
    border-color: rgba(118, 75, 162, 0.4);
}

/* 移动端菜单按钮 */
.mobile-menu-toggle {
    display: none;
    flex-direction: column;
    gap: 4px;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0.5rem;
}

.mobile-menu-toggle span {
    width: 24px;
    height: 2px;
    background: var(--text-primary);
    transition: var(--transition);
}

/* 移动端菜单 */
.mobile-menu {
    position: fixed;
    top: 100%;
    left: 0;
    width: 100%;
    height: calc(100vh - 80px);
    background: rgba(12, 12, 12, 0.98);
    backdrop-filter: blur(20px);
    opacity: 0;
    visibility: hidden;
    transition: var(--transition);
    z-index: 999;
}

.mobile-menu.active {
    top: 80px;
    opacity: 1;
    visibility: visible;
}

.mobile-nav-content {
    padding: 2rem;
    height: 100%;
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.mobile-nav-links {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.mobile-nav-link {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-primary);
    text-decoration: none;
    font-size: 16px;
    transition: var(--transition);
}

.mobile-nav-link:hover {
    background: rgba(255, 255, 255, 0.1);
    transform: translateX(10px);
}

.mobile-nav-icon {
    font-size: 20px;
}

.mobile-controls {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    margin-top: auto;
}

.mobile-control-btn {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--glass-border);
    border-radius: 12px;
    color: var(--text-primary);
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
}

.mobile-control-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

/* Hero区域 */
#hero {
    position: relative;
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    overflow: hidden;
    z-index: 10;
    padding-top: 120px; /* 为导航栏留出空间 */
}

.hero-video-container {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
}

.hero-video-placeholder {
    width: 100%;
    height: 100%;
    object-fit: cover;
    filter: brightness(0.3) contrast(1.2);
}

/* 数据流动画 */
.data-stream {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 5;
    pointer-events: none;
}

.stream-line {
    position: absolute;
    width: 2px;
    height: 100px;
    background: linear-gradient(to bottom, transparent, #4facfe, transparent);
    animation: stream 3s linear infinite;
}

.stream-1 {
    left: 20%;
    animation-delay: 0s;
}

.stream-2 {
    left: 50%;
    animation-delay: 1s;
}

.stream-3 {
    left: 80%;
    animation-delay: 2s;
}

@keyframes stream {
    0% {
        transform: translateY(-100px);
        opacity: 0;
    }
    50% {
        opacity: 1;
    }
    100% {
        transform: translateY(calc(100vh + 100px));
        opacity: 0;
    }
}

.hero-content {
    position: relative;
    z-index: 100;
    text-align: center;
    max-width: 900px;
    padding: 0 2rem;
    margin-top: 20px; /* 增加顶部距离，避免被导航栏遮挡 */
}

.hero-badge {
    display: inline-block;
    padding: 0.5rem 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    margin-bottom: 2rem;
    font-size: 0.9rem;
    color: var(--text-accent);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% {
        transform: scale(1);
        box-shadow: 0 0 0 0 rgba(79, 172, 254, 0.4);
    }
    50% {
        transform: scale(1.05);
        box-shadow: 0 0 0 10px rgba(79, 172, 254, 0);
    }
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 6rem); /* 减小字体大小 */
    font-weight: 900;
    margin: 0 0 1rem 0;
    letter-spacing: -0.02em;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    animation: heroTitleGlow 3s ease-in-out infinite alternate;
}

@keyframes heroTitleGlow {
    0% {
        filter: drop-shadow(0 0 20px rgba(79, 172, 254, 0.5));
    }
    100% {
        filter: drop-shadow(0 0 40px rgba(79, 172, 254, 0.8));
    }
}

.hero-subtitle {
    font-size: clamp(1.2rem, 3vw, 2rem);
    margin: 0 0 3rem 0;
    color: var(--text-secondary);
    font-weight: 300;
}

/* Hero统计数据 */
.hero-stats {
    display: flex;
    justify-content: center;
    gap: 3rem;
    margin: 3rem 0;
    flex-wrap: wrap;
}

.stat-item {
    text-align: center;
    padding: 1.5rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    backdrop-filter: blur(10px);
    min-width: 120px;
    transition: var(--transition);
}

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

.stat-number {
    font-size: 2.5rem;
    font-weight: 700;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.5rem;
    transition: all 0.3s ease;
    position: relative;
    display: inline-block;
    font-family: 'SF Pro Display', -apple-system, BlinkMacSystemFont, sans-serif;
    letter-spacing: -0.02em;
}

.stat-number::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: linear-gradient(45deg, transparent, rgba(79, 172, 254, 0.1), transparent);
    border-radius: 8px;
    opacity: 0;
    transition: opacity 0.3s ease;
    z-index: -1;
}

.stat-number:hover::before {
    opacity: 1;
}

.stat-item:hover .stat-number {
    transform: scale(1.05);
    filter: drop-shadow(0 0 20px rgba(79, 172, 254, 0.3));
}

/* 数字滚动动画关键帧 */
@keyframes numberPulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

@keyframes numberGlow {
    0% { 
        text-shadow: 0 0 5px rgba(79, 172, 254, 0.3);
    }
    50% { 
        text-shadow: 0 0 20px rgba(79, 172, 254, 0.8), 0 0 30px rgba(79, 172, 254, 0.4);
    }
    100% { 
        text-shadow: 0 0 5px rgba(79, 172, 254, 0.3);
    }
}

@keyframes numberSlideUp {
    0% {
        transform: translateY(20px);
        opacity: 0;
    }
    100% {
        transform: translateY(0);
        opacity: 1;
    }
}

/* 数字动画激活状态 */
.stat-number.animating {
    animation: numberPulse 0.3s ease-in-out;
}

.stat-number.completed {
    animation: numberGlow 1s ease-in-out;
}

.stat-number.slide-in {
    animation: numberSlideUp 0.5s ease-out;
}

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

/* 按钮样式 */
.btn {
    display: inline-block;
    padding: 1rem 2rem;
    border-radius: var(--border-radius);
    font-weight: 600;
    text-align: center;
    text-decoration: none;
    position: relative;
    overflow: hidden;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

.btn-large {
    padding: 1.25rem 2.5rem;
    font-size: 1.1rem;
}

.btn-primary {
    background: var(--accent-gradient);
    color: white;
    box-shadow: 0 4px 15px rgba(79, 172, 254, 0.3);
}

.btn-primary:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 25px rgba(79, 172, 254, 0.4);
}

.btn-secondary {
    background: var(--glass-bg);
    color: var(--text-primary);
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.btn-secondary:hover {
    background: rgba(255, 255, 255, 0.2);
    transform: translateY(-3px);
}

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

.btn-outline:hover {
    background: var(--text-accent);
    color: white;
    transform: translateY(-3px);
}

/* 按钮特效 */
.btn-glow {
    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;
}

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

.btn-ripple {
    position: absolute;
    top: 50%;
    left: 50%;
    width: 0;
    height: 0;
    border-radius: 50%;
    background: rgba(255, 255, 255, 0.3);
    transform: translate(-50%, -50%);
    transition: width 0.3s, height 0.3s;
}

.btn-secondary:hover .btn-ripple {
    width: 300px;
    height: 300px;
}

.hero-buttons {
    display: flex;
    gap: 1rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 2rem;
}

/* 滚动指示器 */
.scroll-indicator {
    position: absolute;
    bottom: 5rem; /* 增加底部距离，避免被导航栏遮挡 */
    left: 50%;
    transform: translateX(-50%);
    text-align: center;
    color: var(--text-secondary);
    animation: bounce 2s infinite;
    z-index: 101; /* 确保在其他元素之上 */
}

.scroll-text {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.scroll-arrow {
    width: 20px;
    height: 20px;
    border-right: 2px solid var(--text-accent);
    border-bottom: 2px solid var(--text-accent);
    transform: rotate(45deg);
    margin: 0 auto;
}

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

/* 内容区域 */
.content-section {
    padding: 8rem 0;
    position: relative;
    z-index: 10;
}

.content-section:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
}

.section-header {
    text-align: center;
    margin-bottom: 5rem;
    max-width: 800px;
    margin-left: auto;
    margin-right: auto;
}

.section-badge {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    margin-bottom: 1.5rem;
    font-size: 1rem;
    color: var(--text-accent);
    font-weight: 500;
}

.content-section h2 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    margin-bottom: 2rem;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    line-height: 1.2;
}

.content-section p {
    font-size: 1.3rem;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto;
}

.lead {
    font-size: 1.5rem;
    color: #e2e8f0;
    font-weight: 300;
    line-height: 1.6;
}

/* 特性网格 */
.features-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(380px, 1fr));
    gap: 3rem;
    margin-top: 5rem;
    padding: 0 2rem;
}

.feature-card {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 3rem 2.5rem;
    text-align: center;
    transition: var(--transition);
    backdrop-filter: blur(10px);
    position: relative;
    overflow: hidden;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: space-between;
}

.feature-card:hover {
    transform: translateY(-15px);
    box-shadow: 0 25px 50px rgba(79, 172, 254, 0.2);
    border-color: rgba(79, 172, 254, 0.4);
}

.feature-icon {
    font-size: 4rem;
    margin-bottom: 2rem;
    display: block;
    filter: drop-shadow(0 0 15px rgba(79, 172, 254, 0.4));
    animation: iconFloat 3s ease-in-out infinite;
}

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

.feature-content h3 {
    font-size: 1.8rem;
    margin-bottom: 1.5rem;
    color: var(--text-primary);
    font-weight: 600;
}

.feature-content p {
    color: var(--text-secondary);
    font-size: 1.1rem;
    line-height: 1.7;
    text-align: center;
    margin-bottom: 2rem;
    flex-grow: 1;
}

.feature-progress {
    width: 100%;
    height: 4px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 2px;
    overflow: hidden;
}

.progress-bar {
    height: 100%;
    background: var(--accent-gradient);
    border-radius: 2px;
    width: 0;
    transition: width 2s ease-in-out;
    animation: progressGlow 2s infinite alternate;
}

@keyframes progressGlow {
    0% {
        box-shadow: 0 0 5px rgba(79, 172, 254, 0.5);
    }
    100% {
        box-shadow: 0 0 15px rgba(79, 172, 254, 0.8);
    }
}

.feature-glow {
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(79, 172, 254, 0.1), transparent 70%);
    opacity: 0;
    transition: var(--transition);
}

.feature-card:hover .feature-glow {
    opacity: 1;
}

/* 深色区域 */
.dark-section {
    background: transparent;
    position: relative;
}

.dark-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 30% 50%, rgba(79, 172, 254, 0.1), transparent 50%);
    pointer-events: none;
}

/* 研究区域 */
.research-areas {
    display: flex;
    flex-direction: column;
    gap: 8rem;
    padding: 0 2rem;
}

.research-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 5rem;
    align-items: center;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 4rem;
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.research-item:hover {
    transform: translateY(-10px);
    box-shadow: 0 20px 40px rgba(79, 172, 254, 0.15);
}

.research-item:nth-child(even) {
    direction: rtl;
}

.research-item:nth-child(even) .research-content {
    direction: ltr;
}

.research-visual {
    position: relative;
    overflow: hidden;
    border-radius: var(--border-radius);
}

.research-image {
    width: 100%;
    height: auto;
    border-radius: var(--border-radius);
    transition: var(--transition);
}

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

.research-overlay {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: rgba(0, 0, 0, 0.7);
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: var(--transition);
}

.research-visual:hover .research-overlay {
    opacity: 1;
}

.tech-stack {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
}

.tech-tag {
    padding: 0.5rem 1rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 20px;
    backdrop-filter: blur(10px);
    font-size: 0.8rem;
    color: var(--text-primary);
}

.research-content h3 {
    font-size: 2rem;
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.research-content p {
    text-align: left;
    margin-bottom: 2rem;
}

.research-list {
    list-style: none;
    padding: 0;
    text-align: left;
}

.research-list li {
    display: flex;
    align-items: center;
    padding: 0.75rem 0;
    color: var(--text-secondary);
    transition: var(--transition);
}

.research-list li:hover {
    color: var(--text-primary);
    transform: translateX(10px);
}

.list-icon {
    margin-right: 1rem;
    font-size: 1.2rem;
    filter: drop-shadow(0 0 5px rgba(79, 172, 254, 0.5));
}

/* 时间线 */
.timeline {
    position: relative;
    max-width: 1000px;
    margin: 0 auto;
    padding: 0 2rem;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--accent-gradient);
    transform: translateX(-50%);
    border-radius: 2px;
    box-shadow: 0 0 15px rgba(79, 172, 254, 0.6);
}

.timeline-item {
    display: flex;
    align-items: center;
    margin-bottom: 5rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-year {
    background: var(--accent-gradient);
    color: white;
    padding: 1.2rem 2rem;
    border-radius: 50px;
    font-weight: 700;
    font-size: 1.2rem;
    min-width: 140px;
    text-align: center;
    position: relative;
    z-index: 2;
    box-shadow: 0 8px 25px rgba(79, 172, 254, 0.4);
    border: 3px solid rgba(255, 255, 255, 0.2);
}

.timeline-content {
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: var(--border-radius);
    padding: 2.5rem;
    margin: 0 3rem;
    flex: 1;
    backdrop-filter: blur(10px);
    position: relative;
    transition: var(--transition);
}

.timeline-content:hover {
    transform: translateY(-8px);
    box-shadow: 0 15px 35px rgba(79, 172, 254, 0.2);
    border-color: rgba(79, 172, 254, 0.3);
}

.timeline-icon {
    font-size: 2rem;
    margin-bottom: 1rem;
    filter: drop-shadow(0 0 10px rgba(79, 172, 254, 0.5));
}

.timeline-content h3 {
    margin: 0 0 0.5rem 0;
    color: var(--text-primary);
    font-size: 1.3rem;
}

.timeline-content p {
    margin: 0;
    color: var(--text-secondary);
    text-align: left;
    font-size: 1rem;
}

.timeline-progress {
    position: absolute;
    right: -1.5rem;
    top: 50%;
    transform: translateY(-50%);
}

.timeline-item:nth-child(even) .timeline-progress {
    left: -1.5rem;
    right: auto;
}

.progress-dot {
    width: 12px;
    height: 12px;
    border-radius: 50%;
    border: 3px solid var(--text-accent);
}

.progress-dot.completed {
    background: var(--text-accent);
    box-shadow: 0 0 10px rgba(79, 172, 254, 0.8);
}

.progress-dot.active {
    background: var(--text-accent);
    animation: pulse 2s infinite;
}

.progress-dot.future {
    background: transparent;
    border-color: rgba(79, 172, 254, 0.5);
}

/* CTA区域 */
.cta-section {
    background: transparent;
    text-align: center;
    position: relative;
    overflow: hidden;
    padding: 10rem 0;
}

.cta-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: radial-gradient(circle at 50% 50%, rgba(79, 172, 254, 0.2), transparent 70%);
    pointer-events: none;
}

.cta-content {
    position: relative;
    z-index: 2;
    max-width: 800px;
    margin: 0 auto;
    padding: 0 2rem;
}

.cta-badge {
    display: inline-block;
    padding: 0.75rem 2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    margin-bottom: 2rem;
    font-size: 1rem;
    color: var(--text-accent);
    font-weight: 500;
}

.cta-features {
    display: flex;
    justify-content: center;
    gap: 4rem;
    margin: 4rem 0;
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: 1rem;
    padding: 1.5rem 2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    transition: var(--transition);
    min-width: 200px;
    justify-content: center;
}

.cta-feature:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(79, 172, 254, 0.2);
    border-color: rgba(79, 172, 254, 0.3);
}

.cta-feature-icon {
    font-size: 1.5rem;
    filter: drop-shadow(0 0 8px rgba(79, 172, 254, 0.6));
}

.cta-buttons {
    display: flex;
    gap: 2rem;
    justify-content: center;
    flex-wrap: wrap;
    margin-top: 4rem;
}

.cta-decoration {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    pointer-events: none;
    z-index: 1;
}

.decoration-circle {
    position: absolute;
    border-radius: 50%;
    background: var(--accent-gradient);
    opacity: 0.1;
    animation: float 15s infinite linear;
}

.circle-1 {
    width: 100px;
    height: 100px;
    top: 20%;
    left: 10%;
    animation-delay: 0s;
}

.circle-2 {
    width: 150px;
    height: 150px;
    top: 60%;
    right: 15%;
    animation-delay: -5s;
}

.circle-3 {
    width: 80px;
    height: 80px;
    bottom: 20%;
    left: 70%;
    animation-delay: -10s;
}

/* Footer */
footer {
    background: rgba(15, 15, 35, 0.9);
    border-top: 1px solid var(--glass-border);
    backdrop-filter: blur(20px);
    padding: 4rem 2rem 3rem;
    text-align: center;
    position: relative;
    z-index: 10;
    margin-top: 5rem;
}

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

.footer-main {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    gap: 2rem;
    padding-bottom: 2rem;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-main p {
    color: var(--text-secondary);
    font-size: 1rem;
    margin: 0;
}

.footer-links {
    display: flex;
    gap: 3rem;
    flex-wrap: wrap;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    transition: var(--transition);
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: 8px;
}

.footer-links a:hover {
    color: var(--text-accent);
    background: rgba(79, 172, 254, 0.1);
}

.icp-info {
    color: var(--text-accent);
    font-size: 1rem;
    font-weight: 600;
    opacity: 1;
    transition: var(--transition);
    padding: 1rem 2rem;
    background: var(--glass-bg);
    border: 1px solid var(--glass-border);
    border-radius: 50px;
    backdrop-filter: blur(10px);
    display: inline-block;
    margin-top: 1rem;
}

.icp-info:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 20px rgba(79, 172, 254, 0.2);
    border-color: rgba(79, 172, 254, 0.3);
}

/* 动画类 */
.animate-on-scroll {
    opacity: 0;
    transform: translateY(30px);
    transition: all 0.8s cubic-bezier(0.4, 0, 0.2, 1);
}

.animate-on-scroll.animated {
    opacity: 1;
    transform: translateY(0);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .container {
        padding: 0 1rem;
    }
    
    header {
        padding: 1rem;
    }
    
    nav {
        gap: 1rem;
    }
    
    /* 隐藏桌面导航元素 */
    .nav-center,
    .nav-search,
    .nav-controls {
        display: none;
    }
    
    /* 显示移动端菜单按钮 */
    .mobile-menu-toggle {
        display: flex;
    }
    
    /* Logo适配 */
    .logo {
        gap: 0.5rem;
    }
    
    .logo-cube {
        width: 32px;
        height: 32px;
    }
    
    .cube-face {
        width: 32px;
        height: 32px;
        font-size: 14px;
    }
    
    .cube-face.front { transform: rotateY(0deg) translateZ(16px); }
    .cube-face.back { transform: rotateY(180deg) translateZ(16px); }
    .cube-face.right { transform: rotateY(90deg) translateZ(16px); }
    .cube-face.left { transform: rotateY(-90deg) translateZ(16px); }
    .cube-face.top { transform: rotateX(90deg) translateZ(16px); }
    .cube-face.bottom { transform: rotateX(-90deg) translateZ(16px); }
    
    .logo-text > span {
        font-size: 18px;
    }
    
    .logo-subtitle {
        font-size: 8px;
    }
    
    .hero-content {
        padding: 0 1rem;
    }
    
    .hero-stats {
        gap: 1rem;
        flex-direction: column;
    }
    
    .hero-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .btn {
        width: 100%;
        max-width: 280px;
    }
    
    .content-section {
        padding: 5rem 0;
    }
    
    .section-header {
        margin-bottom: 3rem;
        padding: 0 1rem;
    }
    
    .features-grid {
        grid-template-columns: 1fr;
        gap: 2rem;
        margin-top: 3rem;
        padding: 0 1rem;
    }
    
    .feature-card {
        padding: 2rem 1.5rem;
    }
    
    .research-areas {
        gap: 4rem;
        padding: 0 1rem;
    }
    
    .research-item {
        grid-template-columns: 1fr;
        gap: 3rem;
        text-align: center;
        padding: 2rem;
    }
    
    .research-item:nth-child(even) {
        direction: ltr;
    }
    
    .timeline {
        padding: 0 1rem;
    }
    
    .timeline::before {
        left: 40px;
    }
    
    .timeline-item {
        flex-direction: row !important;
        padding-left: 0;
        margin-bottom: 3rem;
        align-items: flex-start;
    }
    
    .timeline-year {
        min-width: 80px;
        font-size: 0.9rem;
        padding: 0.8rem 1rem;
        margin-right: 1rem;
        flex-shrink: 0;
    }
    
    .timeline-content {
        margin: 0;
        flex: 1;
        margin-left: 1rem;
        padding: 1.5rem;
    }
    
    .cta-section {
        padding: 6rem 0;
    }
    
    .cta-features {
        flex-direction: column;
        align-items: center;
        gap: 1.5rem;
        margin: 3rem 0;
    }
    
    .cta-feature {
        min-width: auto;
        width: 100%;
        max-width: 300px;
    }
    
    .cta-buttons {
        flex-direction: column;
        align-items: center;
        gap: 1rem;
    }
    
    .footer-main {
        flex-direction: column;
        text-align: center;
        gap: 1.5rem;
    }
    
    .footer-links {
        gap: 1.5rem;
        justify-content: center;
    }
}

@media (max-width: 480px) {
    header {
        padding: 0.8rem 1rem;
    }
    
    /* 进一步缩小Logo */
    .logo-cube {
        width: 28px;
        height: 28px;
    }
    
    .cube-face {
        width: 28px;
        height: 28px;
        font-size: 12px;
    }
    
    .logo-text > span {
        font-size: 18px;
    }
    
    .logo-subtitle {
        display: none;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1rem;
    }
    
    .content-section h2 {
        font-size: 1.8rem;
    }
    
    .feature-card {
        padding: 1.5rem;
    }
    
    .timeline::before {
        left: 30px;
    }
    
    .timeline-item {
        flex-direction: column !important;
        align-items: flex-start;
        padding-left: 0;
        margin-bottom: 2.5rem;
    }
    
    .timeline-year {
        font-size: 0.8rem;
        padding: 0.6rem 0.8rem;
        min-width: 70px;
        margin-bottom: 1rem;
        margin-right: 0;
        align-self: flex-start;
    }
    
    .timeline-content {
        margin-left: 0;
        width: 100%;
    }
}

/* 高分辨率屏幕优化 */
@media (min-width: 1400px) {
    .container {
        max-width: 1400px;
    }
    
    .content-section {
        padding: 10rem 2rem;
    }
    
    .features-grid {
        grid-template-columns: repeat(3, 1fr);
    }
}

/* 触摸设备优化 */
@media (hover: none) and (pointer: coarse) {
    .btn:hover,
    .feature-card:hover,
    .research-image:hover {
        transform: none;
    }
    
    .btn:active {
        transform: scale(0.98);
    }
    
    .feature-card:active {
        transform: scale(0.98);
    }
}

/* 减少动画偏好 */
@media (prefers-reduced-motion: reduce) {
    *,
    *::before,
    *::after {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
    
    .animate-on-scroll {
        opacity: 1;
        transform: none;
    }
}

/* 打印样式 */
@media print {
    .background-text,
    .hero-video-container,
    header,
    .floating-shapes,
    #particles-js {
        display: none;
    }
    
    body {
        background: white;
        color: black;
    }
    
    .content-section {
        padding: 2rem 0;
    }
}

/* 表单模态框样式 */
.modal {
    display: none;
    position: fixed;
    z-index: 2000;
    left: 0;
    top: 0;
    width: 100%;
    height: 100%;
    background-color: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

.modal.show {
    display: flex;
    align-items: center;
    justify-content: center;
    animation: modalFadeIn 0.3s ease-out;
}

@keyframes modalFadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

.modal-content {
    background: rgba(12, 12, 12, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    border: 1px solid var(--glass-border);
    border-radius: 16px;
    padding: 0;
    width: 90%;
    max-width: 500px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: var(--shadow-heavy);
    animation: modalSlideIn 0.3s ease-out;
}

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

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 2rem 2rem 1rem;
    border-bottom: 1px solid var(--glass-border);
}

.modal-header h3 {
    margin: 0;
    font-size: 1.5rem;
    font-weight: 600;
    background: var(--accent-gradient);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.close {
    color: var(--text-secondary);
    font-size: 28px;
    font-weight: bold;
    cursor: pointer;
    transition: var(--transition);
    line-height: 1;
}

.close:hover {
    color: var(--text-primary);
    transform: scale(1.1);
}

.join-form {
    padding: 2rem;
}

.form-group {
    margin-bottom: 1.5rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    font-weight: 500;
    color: var(--text-primary);
    font-size: 0.9rem;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 0.8rem 1rem;
    border: 1px solid var(--glass-border);
    border-radius: 8px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    color: var(--text-primary);
    font-size: 0.9rem;
    transition: var(--transition);
}

.form-group input:focus,
.form-group textarea:focus {
    outline: none;
    border-color: var(--text-accent);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 0 0 2px rgba(79, 172, 254, 0.2);
}

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

.form-group textarea {
    resize: vertical;
    min-height: 100px;
}

.form-buttons {
    display: flex;
    gap: 1rem;
    justify-content: flex-end;
    margin-top: 2rem;
}

.form-group input.error,
.form-group textarea.error {
    border-color: #ff6b6b;
    background: rgba(255, 107, 107, 0.1);
}

.error-message {
    color: #ff6b6b;
    font-size: 0.8rem;
    margin-top: 0.25rem;
}

.form-buttons .btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.9rem;
}

/* 优化footer布局 */
.footer-bottom {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--glass-border);
}

.footer-links {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 2rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.footer-links a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.9rem;
    transition: var(--transition);
}

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

.footer-icp {
    text-align: center;
    margin-top: 1rem;
}

.icp-info {
    color: var(--text-secondary);
    font-size: 0.85rem;
    padding: 0.5rem 1rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 6px;
    border: 1px solid var(--glass-border);
    display: inline-block;
}

/* 优化滚动体验，减少白色割裂感 */
html {
    scroll-behavior: smooth;
}

body {
    background-attachment: fixed;
}

.content-section {
    position: relative;
    z-index: 10;
}

/* 移除深色背景，保留动态流线 */
.dark-section {
    background: transparent !important;
}

/* 优化按钮布局，避免遮挡 */
.hero-buttons {
    margin-top: 3rem;
    z-index: 20;
    position: relative;
}

.hero-buttons .btn {
    margin: 0 0.5rem 1rem;
    min-width: 140px;
}

/* 优化竖版排版 */
.research-areas {
    display: flex;
    flex-direction: column;
    gap: 4rem;
    max-width: 1000px;
    margin: 0 auto;
}

.research-item {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
    align-items: center;
    padding: 2rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

.research-item:nth-child(even) {
    grid-template-columns: 1fr 1fr;
}

.research-item:nth-child(even) .research-content {
    order: 2;
}

.research-item:nth-child(even) .research-visual {
    order: 1;
}

/* 优化时间线布局 */
.timeline {
    max-width: 800px;
    margin: 0 auto;
    position: relative;
    padding: 2rem 0;
}

.timeline::before {
    content: '';
    position: absolute;
    left: 50%;
    top: 0;
    bottom: 0;
    width: 4px;
    background: var(--accent-gradient);
    transform: translateX(-50%);
    border-radius: 2px;
    box-shadow: 0 0 20px rgba(79, 172, 254, 0.3);
}

.timeline-item {
    display: flex;
    margin-bottom: 4rem;
    position: relative;
}

.timeline-item:nth-child(odd) {
    flex-direction: row;
}

.timeline-item:nth-child(even) {
    flex-direction: row-reverse;
}

.timeline-year {
    flex: 0 0 120px;
    text-align: center;
    font-size: 1.1rem;
    font-weight: bold;
    padding: 1rem;
    background: var(--accent-gradient);
    color: white;
    border-radius: 12px;
    margin: 0 2rem;
    position: relative;
    z-index: 2;
}

.timeline-content {
    flex: 1;
    background: rgba(255, 255, 255, 0.05);
    padding: 2rem;
    border-radius: 16px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
}

/* 优化CTA区域 */
.cta-section {
    background: rgba(255, 255, 255, 0.02);
    border-radius: 24px;
    margin: 4rem 0;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(15px);
}

.cta-features {
    display: flex;
    justify-content: center;
    gap: 2rem;
    margin: 2rem 0;
    flex-wrap: wrap;
}

.cta-feature {
    display: flex;
    align-items: center;
    gap: 0.8rem;
    padding: 1rem 1.5rem;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    border: 1px solid var(--glass-border);
    backdrop-filter: blur(10px);
    transition: var(--transition);
}

.cta-feature:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-light);
}

.cta-feature-icon {
    font-size: 1.2rem;
}

/* 响应式优化 */
@media (max-width: 768px) {
    .modal-content {
        width: 95%;
        margin: 1rem;
    }
    
    .modal-header,
    .join-form {
        padding: 1.5rem;
    }
    
    .form-buttons {
        flex-direction: column;
    }
    
    .form-buttons .btn {
        width: 100%;
    }
    
    .research-item {
        grid-template-columns: 1fr !important;
        gap: 2rem;
    }
    
    .research-item:nth-child(even) .research-content,
    .research-item:nth-child(even) .research-visual {
        order: unset;
    }
    
    .timeline::before {
        left: 2rem;
    }
    
    .timeline-item {
        flex-direction: column !important;
        margin-left: 4rem;
    }
    
    .timeline-year {
        margin: 0 0 1rem 0;
        align-self: flex-start;
    }
    
    .timeline-content {
        margin: 0;
    }
    
    .cta-features {
        flex-direction: column;
        align-items: center;
    }
    
    .footer-links {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-right {
        top: 0;
        align-items: center;
    }
    
    .slogan-main {
        font-size: 14px;
    }
    
    .slogan-sub {
        font-size: 10px;
    }
}