body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif, "Apple Color Emoji", "Segoe UI Emoji";
    background-color: #ffffff;
    color: #1d1d1f;
    -webkit-font-smoothing: antialiased;
    scroll-behavior: smooth;
    transition: background-color 0.3s ease, color 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    body {
        background-color: #020617;
        color: #f8fafc;
    }
}

/* 核心进场动画 (纯 CSS) */
@keyframes revealUp {
    from {
        opacity: 0;
        transform: translateY(20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

.reveal {
    animation: revealUp 0.8s cubic-bezier(0.16, 1, 0.3, 1) forwards;
    opacity: 0;
}

.delay-1 { animation-delay: 0.1s; }
.delay-2 { animation-delay: 0.2s; }
.delay-3 { animation-delay: 0.3s; }

/* 产品画布阴影与圆角 */
.product-canvas {
    box-shadow: 0 20px 40px rgba(0,0,0,0.04), 0 1px 3px rgba(0,0,0,0.02);
    border: 1px solid rgba(0,0,0,0.05);
    border-radius: 24px;
    transition: all 0.3s ease;
}

@media (prefers-color-scheme: dark) {
    .product-canvas {
        background-color: #0f172a;
        border-color: rgba(255, 255, 255, 0.05);
        box-shadow: 0 30px 60px rgba(0,0,0,0.5);
    }
}

/* 导航栏磨砂效果 */
.nav-blur {
    background: rgba(255, 255, 255, 0.8);
    backdrop-filter: saturate(180%) blur(20px);
}

@media (prefers-color-scheme: dark) {
    .nav-blur {
        background: rgba(2, 6, 23, 0.8);
    }
}

/* 按钮与交互 */
.btn-primary {
    background-color: #0071e3;
    transition: all 0.2s ease;
}

.btn-primary:hover {
    background-color: #0077ed;
    transform: scale(1.02);
}

.feature-card {
    transition: transform 0.3s ease, box-shadow 0.3s ease, background-color 0.3s ease;
}

.feature-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 30px rgba(0,0,0,0.03);
}

@media (prefers-color-scheme: dark) {
    .feature-card:hover {
        background-color: rgba(255, 255, 255, 0.02);
        box-shadow: 0 10px 30px rgba(0,0,0,0.2);
    }
}

/* 徽章样式 */
.status-badge {
    background: rgba(0, 113, 227, 0.05);
    color: #0071e3;
    font-size: 11px;
    font-weight: 600;
    padding: 4px 12px;
    border-radius: 99px;
    display: inline-flex;
    align-items: center;
    gap: 6px;
}

@media (prefers-color-scheme: dark) {
    .status-badge {
        background: rgba(0, 113, 227, 0.15);
        color: #60a5fa;
    }
}

/* 移动端菜单 */
#mobile-menu {
    display: none;
    position: fixed;
    top: 64px;
    left: 0;
    width: 100%;
    background: #fff;
    padding: 24px;
    border-bottom: 1px solid rgba(0,0,0,0.05);
    z-index: 40;
}

@media (prefers-color-scheme: dark) {
    #mobile-menu {
        background: #0f172a;
        border-bottom-color: rgba(255, 255, 255, 0.1);
    }
}