#version 330 core

in vec3 vWorldPos;
in vec3 vWorldNormal;

out vec4 FragColor;
uniform bool uLightMode;

void main() {
    vec3 N = normalize(vWorldNormal);
    float isTop = step(0.75, N.y);

    vec3 topBase;
    vec3 sideBase;

    if (uLightMode) {
        // 浅色主题 偏亮的工业灰
        topBase = vec3(0.78, 0.80, 0.84);
        sideBase = vec3(0.68, 0.70, 0.74);
    }
    else {
        // 深色主题 偏暗的工业灰
        topBase = vec3(0.30, 0.31, 0.32);
        sideBase = vec3(0.27, 0.28, 0.29);
    }

    vec3 baseColor = mix(sideBase, topBase, isTop);
    FragColor = vec4(clamp(baseColor, 0.0, 1.0), 1.0);
}