:root {
    --primary-color: #ffffff;
    --secondary-color: #f0f0f0;
    --background-color: #1a1a1a;
    --text-color: #ffffff;
    --accent-color: #cccccc;
}

body {
    font-family: 'Arial', sans-serif;
    line-height: 1.6;
    color: var(--text-color);
    background-color: var(--background-color);
    margin: 0;
    padding: 0;
}

#particles-js {
    position: fixed;
    width: 100%;
    height: 100%;
    z-index: -1;
}

header {
    background-color: rgba(26, 26, 26, 0.8);
    color: white;
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    backdrop-filter: blur(10px);
}

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

.logo {
    display: flex;
    align-items: center;
}

.logo img {
    width: 40px;
    margin-right: 10px;
}

nav ul {
    display: flex;
    list-style: none;
}

nav ul li {
    margin-left: 20px;
}

nav ul li a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

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

main {
    margin-top: 80px;
}

.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    color: white;
    position: relative;
}

.hero h1 {
    font-size: 3.5rem;
    margin-bottom: 1rem;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.5);
}

.hero p {
    font-size: 1.2rem;
    max-width: 600px;
    margin-bottom: 2rem;
}

.cta-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--background-color);
    padding: 12px 24px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.cta-button:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.features, .demo, .about, .contact {
    padding: 6rem 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

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

.features .feature-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.features .feature-icon {
    font-size: 3em;  /* 增大图标 */
    margin-bottom: 1rem;  /* 增加图标和文字之间的距离 */
    color: #;  /* 设置图标颜色，可以根据需要调整 */
}

.features .feature-text h3 {
    margin-top: 0;
    margin-bottom: 0.5rem;
}

.features .feature-text p {
    margin: 0;
}

h2 {
    font-size: 2.5rem;
    margin-bottom: 2rem;
    text-align: center;
    color: var(--primary-color);
}

.demo-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 2rem;
}

.demo-item {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    display: flex;
    align-items: center;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.demo-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0, 0, 0, 0.2);
}

.demo-item img {
    width: 50%;
    border-radius: 5px;
    margin-right: 1rem;
}

.demo-description {
    flex: 1;
}

.demo-description h3 {
    margin-top: 0;
    color: var(--primary-color);
}

.demo-description p {
    font-size: 0.9rem;
    color: var(--accent-color);
}

.video-link {
    justify-content: center;
    text-align: center;
    padding: 2rem;
}

.video-link a {
    display: flex;
    flex-direction: column;
    align-items: center;
    color: var(--primary-color);
    text-decoration: none;
}

.video-link i {
    font-size: 3rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.about-content, .contact-content {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 3rem;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.about-grid, .contact-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 2rem;
}

.about-item, .contact-info, .contact-form {
    text-align: left;
    padding: 1rem;
}

.about-item i, .contact-info i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.about-description {
    text-align: left;
    margin-top: 2rem;
}

.about-intro, .about-technology, .about-impact {
    margin-bottom: 2rem;
}

.about-description h3 {
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.about-description ul {
    list-style-type: none;
    padding-left: 0;
}

.about-description li {
    margin-bottom: 0.5rem;
    padding-left: 1.5rem;
    position: relative;
}

.about-description li::before {
    content: "\2022";
    color: var(--accent-color);
    font-weight: bold;
    position: absolute;
    left: 0;
}

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

.feature-item {
    display: flex;
    align-items: center;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 1rem;
    border-radius: 10px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.feature-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.feature-item i {
    font-size: 1.5rem;
    margin-right: 1rem;
    color: var(--accent-color);
}

.feature-item span {
    font-size: 0.9rem;
}

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

.contact-form input, .contact-form textarea {
    margin-bottom: 1rem;
    padding: 0.5rem;
    border-radius: 5px;
    border: none;
    background-color: rgba(255, 255, 255, 0.1);
    color: var(--text-color);
}

.contact-button {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--background-color);
    padding: 12px 24px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    border: none;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.3s ease;
}

.contact-button:hover {
    background-color: var(--primary-color);
    transform: translateY(-3px);
}

.social-media {
    text-align: center;
    margin-top: 2rem;
}

.social-icon {
    font-size: 2.5rem;
    color: var(--accent-color);
    transition: color 0.3s ease, transform 0.3s ease;
    display: inline-block;
    margin: 0 15px;
}

.social-icon:hover {
    color: var(--primary-color);
    transform: translateY(-3px);
}

.fa-bilibili {
    width: 1em;
    height: 1em;
    vertical-align: middle;
    background-image: url("data:image/svg+xml,%3Csvg t='1684686780539' class='icon' viewBox='0 0 1024 1024' version='1.1' xmlns='http://www.w3.org/2000/svg' p-id='2493' width='32' height='32'%3E%3Cpath d='M777.514667 131.669333a53.333333 53.333333 0 0 1 0 75.434667L728.746667 255.829333h49.92A160 160 0 0 1 938.666667 415.872v320a160 160 0 0 1-160 160H245.333333A160 160 0 0 1 85.333333 735.872v-320a160 160 0 0 1 160-160h49.749334L246.4 207.146667a53.333333 53.333333 0 1 1 75.392-75.434667l113.152 113.152c3.370667 3.370667 6.186667 7.04 8.448 10.965333h137.088c2.261333-3.925333 5.12-7.68 8.490667-11.008l113.109333-113.152a53.333333 53.333333 0 0 1 75.434667 0z m1.152 231.253334H245.333333a53.333333 53.333333 0 0 0-53.205333 49.365333l-0.128 4.010667v320c0 28.117333 21.76 51.157333 49.365333 53.162666l3.968 0.170667h533.333334a53.333333 53.333333 0 0 0 53.205333-49.365333l0.128-3.968v-320c0-29.44-23.893333-53.333333-53.333333-53.333334z m-426.666667 106.666666c29.44 0 53.333333 23.893333 53.333333 53.333334v53.333333a53.333333 53.333333 0 1 1-106.666666 0v-53.333333c0-29.44 23.893333-53.333333 53.333333-53.333334z m320 0c29.44 0 53.333333 23.893333 53.333333 53.333334v53.333333a53.333333 53.333333 0 1 1-106.666666 0v-53.333333c0-29.44 23.893333-53.333333 53.333333-53.333334z' fill='%23ffffff' p-id='2494'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: contain;
    display: inline-block;
}

@media (max-width: 768px) {
    nav {
        flex-direction: column;
    }

    nav ul {
        margin-top: 1rem;
    }

    .hero h1 {
        font-size: 2.5rem;
    }

    .demo-grid {
        grid-template-columns: 1fr;
    }

    .demo-item {
        flex-direction: column;
    }

    .demo-item img {
        width: 100%;
        margin-right: 0;
        margin-bottom: 1rem;
    }

    .video-link {
        grid-column: auto;
    }

    .about-grid, .contact-grid {
        grid-template-columns: 1fr;
    }
}

.scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0.5;
    transition: opacity 0.3s ease;
}

.scroll-down i {
    font-size: 2rem;
    color: var(--accent-color);
    animation: float 2s ease-in-out infinite;
}

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

.scroll-down:hover {
    opacity: 1;
}

.contact-info a {
    color: var(--accent-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

.contact-info a:hover {
    color: var(--primary-color);
}

.fa-bilibili {
    width: 1em;
    height: 1em;
    vertical-align: -.125em;
    background-image: url("data:image/svg+xml,%3Csvg t='1684686780539' class='icon' viewBox='0 0 1024 1024' version='1.1' xmlns='http://www.w3.org/2000/svg' p-id='2493' width='32' height='32'%3E%3Cpath d='M777.514667 131.669333a53.333333 53.333333 0 0 1 0 75.434667L728.746667 255.829333h49.92A160 160 0 0 1 938.666667 415.872v320a160 160 0 0 1-160 160H245.333333A160 160 0 0 1 85.333333 735.872v-320a160 160 0 0 1 160-160h49.749334L246.4 207.146667a53.333333 53.333333 0 1 1 75.392-75.434667l113.152 113.152c3.370667 3.370667 6.186667 7.04 8.448 10.965333h137.088c2.261333-3.925333 5.12-7.68 8.490667-11.008l113.109333-113.152a53.333333 53.333333 0 0 1 75.434667 0z m1.152 231.253334H245.333333a53.333333 53.333333 0 0 0-53.205333 49.365333l-0.128 4.010667v320c0 28.117333 21.76 51.157333 49.365333 53.162666l3.968 0.170667h533.333334a53.333333 53.333333 0 0 0 53.205333-49.365333l0.128-3.968v-320c0-29.44-23.893333-53.333333-53.333333-53.333334z m-426.666667 106.666666c29.44 0 53.333333 23.893333 53.333333 53.333334v53.333333a53.333333 53.333333 0 1 1-106.666666 0v-53.333333c0-29.44 23.893333-53.333333 53.333333-53.333334z m320 0c29.44 0 53.333333 23.893333 53.333333 53.333334v53.333333a53.333333 53.333333 0 1 1-106.666666 0v-53.333333c0-29.44 23.893333-53.333333 53.333333-53.333334z' fill='%23ffffff' p-id='2494'%3E%3C/path%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-size: contain;
    display: inline-block;
}

.about-content {
    text-align: center;
    max-width: 900px;
    margin: 0 auto;
}

.about-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
    margin-bottom: 3rem;
}

.about-item {
    background-color: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 10px;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.about-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.2);
}

.about-item i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 1rem;
}

.about-item h3 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

.about-item p {
    font-size: 1rem;
}

.about-description {
    text-align: left;
    background-color: rgba(255, 255, 255, 0.1);
    padding: 2rem;
    border-radius: 10px;
}

.about-description h3 {
    font-size: 1.8rem;
    margin-bottom: 1rem;
    color: var(--accent-color);
}

.about-description p {
    margin-bottom: 1rem;
}

.about-description ul {
    list-style-type: none;
    padding-left: 1rem;
    margin-bottom: 1rem;
}

.about-description li {
    margin-bottom: 0.5rem;
    position: relative;
}

.about-description li::before {
    content: "•";
    color: var(--accent-color);
    font-weight: bold;
    position: absolute;
    left: -1rem;
}

@media (max-width: 768px) {
    .about-grid {
        grid-template-columns: 1fr;
    }
}