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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: #0a0a0a;
    color: #ffffff;
    overflow: hidden;
}

/* 3D 场景容器 */
#canvas-container {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
}

#canvas-container canvas {
    display: block;
}

/* UI 覆盖层 */
.ui-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 10;
    pointer-events: none;
    display: flex;
    flex-direction: column;
}

/* 导航栏 */
.navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 30px 60px;
    pointer-events: auto;
}

.nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    letter-spacing: 4px;
    color: #fff;
    text-shadow: 0 0 20px rgba(76, 175, 80, 0.5);
}

.nav-links {
    display: flex;
    gap: 40px;
}

.nav-link {
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    font-size: 0.95rem;
    font-weight: 400;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    position: relative;
}

.nav-link::after {
    content: '';
    position: absolute;
    bottom: -5px;
    left: 0;
    width: 0;
    height: 1px;
    background: #4caf50;
    transition: width 0.3s ease;
}

.nav-link:hover {
    color: #4caf50;
}

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

/* 主要内容 */
.hero-content {
    flex: 1;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    padding: 0 10%;
    max-width: 800px;
}

.hero-title {
    font-size: clamp(2.5rem, 6vw, 4.5rem);
    font-weight: 300;
    line-height: 1.2;
    letter-spacing: -1px;
    margin-bottom: 24px;
    background: linear-gradient(135deg, #fff 0%, #e0e0e0 50%, #4caf50 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    text-shadow: none;
}

.hero-subtitle {
    font-size: 1.1rem;
    color: rgba(255, 255, 255, 0.6);
    font-weight: 300;
    letter-spacing: 0.5px;
    line-height: 1.6;
    margin-bottom: 40px;
    max-width: 500px;
}

.cta-button {
    padding: 16px 48px;
    font-size: 0.95rem;
    font-weight: 500;
    letter-spacing: 2px;
    color: #0a0a0a;
    background: linear-gradient(135deg, #4caf50 0%, #66bb6a 100%);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.4s ease;
    position: relative;
    overflow: hidden;
}

.cta-button::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;
}

.cta-button:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 40px rgba(76, 175, 80, 0.4);
}

.cta-button:hover::before {
    left: 100%;
}

/* 底部提示 */
.bottom-hint {
    position: absolute;
    bottom: 40px;
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    align-items: center;
    gap: 12px;
    color: rgba(255, 255, 255, 0.4);
    font-size: 0.85rem;
    letter-spacing: 2px;
    animation: float 3s ease-in-out infinite;
}

.hint-icon {
    display: inline-block;
    animation: bounce 2s ease-in-out infinite;
}

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

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-5px); }
}

/* 加载动画 */
.loading-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: #0a0a0a;
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    transition: opacity 0.8s ease, visibility 0.8s ease;
}

.loading-screen.hidden {
    opacity: 0;
    visibility: hidden;
}

.loading-spinner {
    width: 60px;
    height: 60px;
    border: 2px solid rgba(76, 175, 80, 0.2);
    border-top-color: #4caf50;
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* 响应式设计 */
@media (max-width: 768px) {
    .navbar {
        padding: 20px 30px;
    }

    .nav-links {
        gap: 20px;
    }

    .hero-content {
        padding: 0 5%;
        align-items: center;
        text-align: center;
    }

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

    .hero-subtitle {
        font-size: 1rem;
        text-align: center;
    }
}