:root {
    --primary: #1a73e8;
    --primary-dark: #0d47a1;
    --accent: #00bcd4;
    --dark: #111827;
    --dark-2: #1e293b;
    --light: #ffffff;
    --gradient: linear-gradient(135deg, var(--primary), var(--accent));
    --shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
    --transition: all 0.4s cubic-bezier(0.25, 0.8, 0.25, 1);
    --card-bg: rgba(30, 41, 59, 0.8);
}


#loader {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, #0d1530, #091126);
    z-index: 9999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* 其他样式保持不变... */




.logo-animation {
    position: relative;
    width: 200px;
    height: 200px;
    display: flex;
    justify-content: center;
    align-items: center;
}

.logo-animation .circle {
    position: absolute;
    width: 100%;
    height: 100%;
    border: 3px solid rgba(26, 115, 232, 0.2);
    border-radius: 50%;
    animation: pulse 4s infinite ease-in-out;
}

.logo-animation .circle:nth-child(1) {
    animation-delay: -0.5s;
}

.logo-animation .circle:nth-child(2) {
    animation-delay: -1s;
    width: 80%;
    height: 80%;
}

.logo-animation .circle:nth-child(3) {
    animation-delay: -1.5s;
    width: 60%;
    height: 60%;
}

.logo-animation .text {
    position: relative;
    color: white;
    font-size: 2.5rem;
    font-weight: 700;
    text-align: center;
    opacity: 0;
    animation: textFade 4s infinite;
}

.logo-animation .stars i {
    position: absolute;
    color: white;
    font-size: 1.2rem;
    opacity: 0;
}

.logo-animation .stars i:nth-child(1) { top: 10%; left: 15%; animation: starFade 6s infinite; animation-delay: 0.5s; }
.logo-animation .stars i:nth-child(2) { top: 30%; left: 85%; animation: starFade 6s infinite; animation-delay: 1s; }
.logo-animation .stars i:nth-child(3) { top: 80%; left: 20%; animation: starFade 6s infinite; animation-delay: 1.5s; }
.logo-animation .stars i:nth-child(4) { top: 65%; left: 75%; animation: starFade 6s infinite; animation-delay: 2s; }
.logo-animation .stars i:nth-child(5) { top: 25%; left: 40%; animation: starFade 6s infinite; animation-delay: 2.5s; }

@keyframes pulse {
    0%, 100% { 
        border-color: rgba(26, 115, 232, 0.2); 
        transform: scale(1);
    }
    50% { 
        border-color: rgba(0, 188, 212, 0.5); 
        transform: scale(1.1);
        box-shadow: 0 0 30px rgba(0, 188, 212, 0.2);
    }
}

@keyframes textFade {
    0%, 100% { opacity: 0; transform: translateY(20px); }
    20%, 80% { opacity: 1; transform: translateY(0); }
}

@keyframes starFade {
    0%, 100% { opacity: 0; transform: scale(0.5); }
    30%, 70% { opacity: 1; transform: scale(1.2); }
}

.grid-bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        radial-gradient(circle at 10% 20%, rgba(26, 115, 232, 0.1) 0%, transparent 20%),
        radial-gradient(circle at 90% 80%, rgba(0, 188, 212, 0.1) 0%, transparent 20%);
    background-size: 200% 200%;
    z-index: -1;
    animation: gradientBG 15s ease infinite;
    opacity: 0.6;
}

.grid-bg::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: 
        linear-gradient(90deg, transparent 95%, rgba(26, 115, 232, 0.1) 95%),
        linear-gradient(0deg, transparent 95%, rgba(26, 115, 232, 0.1) 95%);
    background-size: 80px 80px;
    opacity: 0.2;
}

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

.floating-balls {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1;
    pointer-events: none;
}

.floating-balls div {
    position: absolute;
    border-radius: 50%;
    background: rgba(26, 115, 232, 0.1);
}

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

body {
    font-family: 'Segoe UI', 'Microsoft YaHei', sans-serif;
    color: var(--light);
    background-color: var(--dark);
    line-height: 1.6;
    overflow-x: hidden;
    min-height: 100vh;
}

header {
    position: fixed;
    top: 0;
    width: 100%;
    padding: 20px 5%;
    background: rgba(30, 41, 59, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    transition: var(--transition);
}

.scrolled {
    padding: 15px 5%;
}

.logo {
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--light);
    display: flex;
    align-items: center;
}

.logo i {
    margin-right: 10px;
    color: var(--accent);
}

.nav-links {
    display: flex;
    gap: 30px;
}

.nav-links a {
    text-decoration: none;
    color: var(--light);
    font-weight: 500;
    position: relative;
    padding: 5px 0;
    transition: var(--transition);
}

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

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

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

.menu-btn {
    display: none;
    width: 44px;
    height: 44px;
    border-radius: 50%;
    background: var(--gradient);
    color: white;
    justify-content: center;
    align-items: center;
    cursor: pointer;
}

.hero {
    min-height: 100vh;
    padding: 180px 5% 100px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    position: relative;
    z-index: 2;
}

.hero-content {
    max-width: 800px;
    margin: 0 auto;
    text-align: center;
}

h1 {
    font-size: 3.5rem;
    font-weight: 800;
    line-height: 1.2;
    margin-bottom: 30px;
    background: linear-gradient(to right, #ffffff, #00bcd4);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
}

.hero p {
    font-size: 1.2rem;
    color: rgba(255, 255, 255, 0.9);
    margin-bottom: 40px;
    line-height: 1.7;
    max-width: 700px;
    margin-left: auto;
    margin-right: auto;
}

.cta-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    margin-bottom: 60px;
}

.cta-btn {
    padding: 14px 32px;
    border-radius: 50px;
    font-weight: 500;
    text-decoration: none;
    font-size: 1.1rem;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: var(--transition);
    box-shadow: var(--shadow);
}

.cta-btn.primary {
    background: var(--gradient);
    color: white;
}

.cta-btn.primary:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(26, 115, 232, 0.4);
}

.cta-btn.secondary {
    background: transparent;
    color: white;
    border: 2px solid white;
}

.cta-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.1);
}

.time-tracker {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    padding: 25px;
    box-shadow: var(--shadow);
    max-width: 800px;
    margin: 0 auto 60px;
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.time-tracker-title {
    font-size: 1.6rem;
    font-weight: 600;
    margin-bottom: 25px;
    text-align: center;
    color: var(--light);
}

.time-units {
    display: flex;
    justify-content: center;
    gap: 10px;
    flex-wrap: wrap;
}

.time-unit {
    text-align: center;
    padding: 20px;
    min-width: 120px;
    background: rgba(26, 115, 232, 0.15);
    border-radius: 15px;
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255, 255, 255, 0.05);
    transition: var(--transition);
}

.time-unit:hover {
    background: rgba(0, 188, 212, 0.2);
    transform: translateY(-5px);
}

.time-value {
    font-size: 2.8rem;
    font-weight: 700;
    color: var(--accent);
    display: block;
    margin-bottom: 5px;
}

.time-label {
    font-size: 1rem;
    color: rgba(255, 255, 255, 0.8);
}

.about-section {
    padding: 100px 5%;
    position: relative;
}

.section-title {
    text-align: center;
    font-size: 2.8rem;
    font-weight: 800;
    margin-bottom: 80px;
    position: relative;
    color: var(--light);
}

.section-title:after {
    content: '';
    position: absolute;
    bottom: -15px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 5px;
    background: var(--gradient);
    border-radius: 3px;
}

.about-timeline {
    max-width: 900px;
    margin: 0 auto;
    position: relative;
}

.about-timeline::before {
    content: '';
    position: absolute;
    top: 0;
    left: 50%;
    width: 4px;
    height: 100%;
    background: linear-gradient(to bottom, var(--primary), var(--accent));
    transform: translateX(-50%);
    z-index: 1;
}

.timeline-item {
    position: relative;
    width: 45%;
    padding: 25px;
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    margin-bottom: 40px;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.05);
    opacity: 0;
    transform: translateY(50px);
    transition: var(--transition);
}

.timeline-item.active {
    opacity: 1;
    transform: translateY(0);
}

.timeline-item:nth-child(even) {
    margin-left: 55%;
}

.timeline-item:nth-child(odd)::before {
    content: '';
    position: absolute;
    top: 30px;
    right: -15px;
    width: 15px;
    height: 15px;
    background: var(--accent);
    border-radius: 50%;
    z-index: 2;
}

.timeline-item:nth-child(even)::before {
    content: '';
    position: absolute;
    top: 30px;
    left: -15px;
    width: 15px;
    height: 15px;
    background: var(--accent);
    border-radius: 50%;
    z-index: 2;
}

.timeline-date {
    font-size: 1.2rem;
    color: var(--accent);
    margin-bottom: 15px;
    font-weight: 600;
}

.timeline-title {
    font-size: 1.8rem;
    margin-bottom: 15px;
    color: var(--light);
}

.timeline-content {
    color: rgba(255, 255, 255, 0.8);
    line-height: 1.7;
    font-size: 
}

.team-section {
    padding: 100px 5%;
    background: rgba(17, 24, 39, 0.8);
    position: relative;
}

.team-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 40px;
    max-width: 1200
    margin: 0 auto;
}

.member-card {
    background: var(--card-bg);
    backdrop-filter: blur(10px);
    border-radius: 20px;
    overflow: hidden;
    box-shadow: var(--shadow);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: var(--transition);
    opacity: 0;
    transform: translateY(50px);
}

.member-card.active {
    opacity: 1;
    transform: translateY(0);
}

.member-image {
    height: 320px;
    overflow: hidden;
    position: relative;
}

.member-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.8s;
}

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

.member-info {
    padding: 30px;
    text-align: center;
    background: rgba(30, 41, 59, 0.7);
}

.member-name {
    font-size: 1.8rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--light);
}

.member-role {
    color: var(--accent);
    font-weight: 600;
    font-size: 1.2rem;
    margin-bottom: 20px;
    display: block;
}

.member-desc {
    color: rgba(255, 255, 255, 0.85);
    font-size: 1.1rem;
    line-height: 1.7;
}

.projects-section {
    padding: 100px 5%;
    background: rgba(17, 24, 39, 0.8);
}

.project-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: 30px;
    max-width: 1200px;
    margin: 0 auto;
}

.project-card {
    position: relative;
    height: 300px;
    perspective: 1000px;
}

.project-card-inner {
    position: relative;
    width: 100%;
    height: 100%;
    transition: transform 0.8s;
    transform-style: preserve-3d;
}

.project-card:hover .project-card-inner {
    transform: rotateY(180deg);
}

.project-front, .project-back {
    position: absolute;
    width: 100%;
    height: 100%;
    backface-visibility: hidden;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: var(--shadow);
}

.project-front {
    background-color: var(--card-bg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    padding: 30px;
    text-align: center;
}

.project-icon {
    font-size: 3.5rem;
    color: var(--accent);
    margin-bottom: 20px;
}

.project-title {
    font-size: 1.7rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: var(--light);
}

.project-tags {
    display: flex;
    justify-content: center;
    gap: 10px;
    margin-top: 20px;
}

.project-tag {
    background: rgba(26, 115, 232, 0.15);
    color: rgba(255, 255, 255, 0.9);
    padding: 5px 15px;
    border-radius: 50px;
    font-size: 0.9rem;
}

.view-details {
    position: absolute;
    bottom: 25px;
    left: 0;
    width: 100%;
    text-align: center;
    color: var(--accent);
    font-size: 1.1rem;
    font-weight: 500;
    opacity: 0.8;
}

.project-back {
    background: linear-gradient(135deg, rgba(26, 115, 232, 0.8), rgba(0, 188, 212, 0.8));
    transform: rotateY(180deg);
    padding: 30px;
    display: flex;
    flex-direction: column;
    justify-content: center;
}

.project-description {
    color: white;
    font-size: 1.1rem;
    line-height: 1.7;
    margin-bottom: 30px;
}

.project-link {
    display: inline-block;
    padding: 12px 30px;
    background: white;
    color: var(--primary);
    border-radius: 50px;
    text-decoration: none;
    font-weight: 600;
    transition: var(--transition);
    text-align: center;
}

.project-link:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 15px rgba(0, 0, 0, 0.2);
}

footer {
    background: rgba(17, 24, 39, 0.95);
    padding: 100px 5% 50px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 40px;
    max-width: 1200px;
    margin: 0 auto;
}

.footer-logo {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 15px;
    color: white;
}

.footer-desc {
    color: rgba(255, 255, 255, 0.7);
    margin-bottom: 25px;
    line-height: 1.7;
    font-size: 1.1rem;
}

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

.social-link {
    width: 45px;
    height: 45px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    background: rgba(255, 255, 255, 0.1);
    color: white;
    transition: var(--transition);
    font-size: 1.2rem;
}

.social-link:hover {
    background: var(--primary);
    transform: translateY(-5px);
}

.footer-title {
    font-size: 1.4rem;
    font-weight: 600;
    margin-bottom: 25px;
    color: white;
}

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

.footer-links li {
    margin-bottom: 15px;
}

.footer-links a {
    color: rgba(255, 255, 255, 0.7);
    text-decoration: none;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 12px;
}

.footer-links a:hover {
    color: var(--accent);
    padding-left: 5px;
}

.footer-links a i {
    min-width: 20px;
}

.contact-info {
    list-style: none;
}

.contact-info li {
    display: flex;
    margin-bottom: 25px;
    gap: 15px;
}

.contact-icon {
    font-size: 1.3rem;
    color: var(--accent);
    margin-top: 5px;
}

.contact-text {
    color: rgba(255, 255, 255, 0.7);
    font-size: 1.1rem;
}

.copyright {
    text-align: center;
    padding-top: 50px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: rgba(255, 255, 255, 0.5);
    font-size: 1rem;
    max-width: 1200px;
    margin: 0 auto;
}

@media (max-width: 992px) {
    .about-timeline::before {
        left: 20px;
    }
    
    .timeline-item, .timeline-item:nth-child(even) {
        width: calc(100% - 60px);
        margin-left: 40px;
    }
    
    .timeline-item:nth-child(even)::before, 
    .timeline-item:nth-child(odd)::before {
        left: -35px;
        right: auto;
    }
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }
    
    .menu-btn {
        display: flex;
    }
    
    h1 {
        font-size: 2.5rem;
    }
    
    .time-unit {
        min-width: 100px;
        padding: 15px;
    }
    
    .cta-buttons {
        flex-direction: column;
        gap: 15px;
    }
    
    .about-timeline::before {
        left: 10px;
    }
    
    .timeline-item, .
    .timeline-item:nth-child(even) {
        width: calc(100% - 40px);
        margin-left: 30px;
    }
    
    .timeline-item:nth-child(even)::before, 
    .timeline-item:nth-child(odd)::before {
        left: -25px;
    }
}

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