* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Open Sans, Microsoft YaHei UI, sans-serif, "Segoe UI Emoji";
}

:root {
    --bg-primary: #fefefe;
    --bg-secondary: #f7f8fc;
    --text-primary: #1a1a1a;
    --text-secondary: #666666;
    --accent: #e8f0fe;
    --accent-active: #d2e3fc;
    --border: #e8eaed;
    --shadow: rgba(0, 0, 0, 0.04);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
    overflow: hidden;
    background: #fefefe;
    color: var(--text-primary);
    line-height: 1.6;
}

a{
    color: inherit;
    text-decoration: none;
}

/* 粒子背景 */
.particles-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 0;
    pointer-events: none;
}

#particles-canvas {
    width: 100%;
    height: 100%;
    opacity: 0.8;
}

.lang-switch {
    position: fixed;
    top: 3rem;
    right: 3rem;
    z-index: 1000;
    display: flex;
    background: var(--bg-primary);
    border-radius: 24px;
    padding: 4px;
    box-shadow: 0 2px 12px var(--shadow);
    border: 1px solid var(--border);
}

.lang-btn {
    background: transparent;
    border: none;
    color: var(--text-secondary);
    padding: 8px 16px;
    cursor: pointer;
    border-radius: 20px;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.2s ease;
    min-width: 50px;
}

.lang-btn:hover {
    background: var(--accent);
    color: var(--text-primary);
}

.lang-btn.active {
    background: var(--accent-active);
    color: var(--text-primary);
    box-shadow: 0 1px 3px var(--shadow);
}

/* 导航 */
.nav {
    position: fixed;
    top: 3rem;
    left: 3rem;
    z-index: 1000;
}

.logo {
    height: 32px;
    opacity: 0.9;
    transition: opacity 0.2s ease;
}

.logo:hover {
    opacity: 1;
}

.nav-dots {
    position: fixed;
    top: 50%;
    left: 2rem;
    transform: translateY(-50%);
    display: flex;
    flex-direction: column;
    gap: 16px;
    background: var(--bg-primary);
    padding: 16px 8px;
    border-radius: 20px;
    box-shadow: 0 2px 12px var(--shadow);
    border: 1px solid var(--border);
    z-index: 1000;
}

.dot {
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: var(--text-secondary);
    cursor: pointer;
    transition: all 0.2s ease;
    opacity: 0.4;
}

.dot:hover {
    opacity: 0.8;
    transform: scale(1.5);
}

.dot.active {
    opacity: 1;
    background: var(--text-primary);
    transform: scale(1.5);
}

/* 容器 */
.container {
    height: 100vh;
    position: relative;
}

/* 区块 */
.section {
    height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    opacity: 0;
    visibility: hidden;
    transition: all 0.6s ease;
    transform: translateY(20px);
    z-index: 1;
}

.section.active {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

/* 去掉交替背景，先测试粒子 */

.content {
    text-align: center;
    max-width: 900px;
    padding: 4rem 2rem;
}

/* 首页 */
.hero-section {
    position: relative;
}

.hero-container {
    display: flex;
    height: 100vh;
    max-width: 1400px;
    margin: 0 auto;
    padding: 0 4rem;
}

.hero-left {
    /*flex: 0 0 65%;*/
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding-right: 2rem;
    text-align: left;
}

.hero-right {
    flex: 1;
    /* 右侧留空 */
}

.title {
    font-size: 5.5rem;
    font-weight: 600;
    letter-spacing: 0.1rem;
    margin-bottom: 2rem;
    color: var(--text-primary);
    line-height: 1.1;
}

.slogan {
    font-size: 1.6rem;
    font-weight: 400;
    letter-spacing: 0.1rem;
    color: var(--text-secondary);
    margin-bottom: 3rem;
}

.hero-description {
    font-size: 1.2rem;
    color: var(--text-secondary);
    line-height: 1.8;
    max-width: 600px;
    opacity: 0.8;
}

/* 业务区块 */
.business-content {
    text-align: center;
    max-width: 800px;
    padding: 4rem 2rem;
}

.section-title {
    font-size: 2.5rem;
    font-weight: 300;
    margin-bottom: 2rem;
    letter-spacing: 0.05rem;
    color: var(--text-primary);
}

.section-desc {
    font-size: 1.125rem;
    font-weight: 400;
    line-height: 1.8;
    color: var(--text-secondary);
    max-width: 700px;
    margin: 0 auto 3rem;
    min-height: 80px;
}

.learn-more-btn {
    display: inline-block;
    padding: 12px 32px;
    border: 1.5px solid #a8dadc;
    background: transparent;
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 24px;
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 0.05rem;
    transition: all 0.3s ease;
    cursor: pointer;
}

.learn-more-btn:hover {
    background: #a8dadc;
    color: var(--bg-primary);
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(168, 218, 220, 0.3);
}

/* 固定底部备案信息 */
.fixed-footer {
    position: fixed;
    bottom: 0;
    left: 0;
    width: 100%;
    /* background: rgba(254, 254, 254, 0.95); */
    backdrop-filter: blur(10px);
    /* border-top: 1px solid var(--border); */
    padding: 6px 0;
    text-align: center;
    font-size: 0.75rem;
    color: var(--text-secondary);
    line-height: 1.4;
    z-index: 100;
}

.fixed-footer p {
    margin: 6px 0;
}

/* 联系我们 */
.contact-info {
    margin: 4rem 0;
    font-size: 1rem;
    line-height: 2.2;
    color: var(--text-secondary);
}

.contact-info p {
    margin: 1.5rem 0;
}

.footer {
    margin-top: 5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    line-height: 1.8;
    opacity: 0.8;
}

/* 动画 */
.fade-in {
    animation: fadeIn 1s ease forwards;
}

.fade-in-delay {
    animation: fadeIn 1s ease 0.3s forwards;
    opacity: 0;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(20px);
    }

    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* 响应式 */
@media (max-width: 768px) {
    .fixed-footer {
        font-size: 0.7rem;
        padding: 10px 1rem;
    }

    .title {
        font-size: 3.5rem;
        letter-spacing: 0.1rem;
    }

    .slogan {
        font-size: 1.125rem;
    }

    .section-title {
        font-size: 2rem;
    }

    .section-desc {
        font-size: 1rem;
    }

    .nav {
        top: 2rem;
        left: 2rem;
    }

    .nav-dots {
        left: 1.5rem;
    }

    .logo {
        height: 28px;
    }

    .lang-switch {
        top: 2rem;
        right: 2rem;
    }

    .content {
        padding: 3rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .fixed-footer {
        font-size: 0.65rem;
        padding: 8px 0.5rem;
    }

    .title {
        font-size: 2.5rem;
        letter-spacing: 0.05rem;
    }

    .slogan {
        font-size: 1rem;
    }

    .section-title {
        font-size: 1.75rem;
    }

    .nav {
        top: 1.5rem;
        left: 1.5rem;
    }

    .nav-dots {
        left: 1rem;
        padding: 12px 6px;
        gap: 12px;
    }

    .lang-switch {
        top: 1.5rem;
        right: 1.5rem;
    }

    .content {
        padding: 2rem 1rem;
    }
}

/* 大屏幕优化 */
@media (min-width: 1440px) {
    .hero-container {
        max-width: 1600px;
        padding: 0 6rem;
    }
    
    .hero-left {
        /*flex: 0 0 70%;*/
    }
    
    .title {
        font-size: 6rem;
    }
    
    .slogan {
        font-size: 1.8rem;
    }
    
    .hero-description {
        font-size: 1.3rem;
        max-width: 700px;
    }
}

/* 超大屏幕优化 */
@media (min-width: 1920px) {
    .hero-container {
        max-width: 2000px;
        padding: 0 8rem;
    }
    
    .hero-left {
        /*flex: 0 0 80%;*/
    }
    
    .title {
        font-size: 6.5rem;
    }
    
    .slogan {
        font-size: 2rem;
    }
    
    .hero-description {
        font-size: 1.4rem;
        max-width: 800px;
    }
}
@media (max-width: 768px) {
    .hero-container {
        flex-direction: column;
        padding: 0 2rem;
    }
    
    .hero-left {
        padding-right: 0;
        text-align: center;
        justify-content: center;
    }
    
    .hero-right {
        display: none;
    }
    
    .title {
        font-size: 3.5rem;
    }
    
    .slogan {
        font-size: 1.25rem;
        margin-bottom: 2rem;
    }
    
    .hero-description {
        font-size: 1rem;
        max-width: none;
    }
    
    .business-content {
        padding: 3rem 1.5rem;
    }
}

@media (max-width: 480px) {
    .hero-container {
        padding: 0 1rem;
    }
    
    .title {
        font-size: 2.5rem;
        letter-spacing: 0.05rem;
    }
    
    .slogan {
        font-size: 1.125rem;
    }
    
    .hero-description {
        font-size: 0.95rem;
    }
    
    .business-content {
        padding: 2rem 1rem;
    }
    
    .learn-more-btn {
        padding: 10px 24px;
        font-size: 0.9rem;
    }
}