first commit

shaders/menu_background.gdshader

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+shader_type canvas_item;
+
+// Анимированный фон главного меню: градиент + полярное сияние + звёзды + виньетка.
+
+uniform vec4 color_top : source_color = vec4(0.035, 0.043, 0.098, 1.0);
+uniform vec4 color_bottom : source_color = vec4(0.020, 0.106, 0.133, 1.0);
+uniform vec4 aurora_a : source_color = vec4(0.180, 0.850, 0.760, 1.0);
+uniform vec4 aurora_b : source_color = vec4(0.470, 0.360, 0.960, 1.0);
+uniform float speed : hint_range(0.0, 1.0) = 0.12;
+uniform float aurora_strength : hint_range(0.0, 2.0) = 0.55;
+uniform float star_amount : hint_range(0.0, 1.0) = 0.45;
+uniform float vignette_strength : hint_range(0.0, 1.0) = 0.65;
+
+float hash21(vec2 p) {
+	p = fract(p * vec2(123.34, 456.21));
+	p += dot(p, p + 45.32);
+	return fract(p.x * p.y);
+}
+
+// Мягкая волнистая полоса «сияния» на высоте center.
+float aurora_band(vec2 uv, float t, float center, float freq, float thickness) {
+	float y = center
+		+ 0.090 * sin(uv.x * freq + t)
+		+ 0.055 * sin(uv.x * freq * 1.7 - t * 1.3)
+		+ 0.025 * sin(uv.x * freq * 3.1 + t * 0.7);
+	float d = abs(uv.y - y);
+	float band = smoothstep(thickness, 0.0, d);
+	return band * band;
+}
+
+void fragment() {
+	vec2 uv = UV;
+	float t = TIME * speed * 6.28318;
+
+	vec3 col = mix(color_top.rgb, color_bottom.rgb, smoothstep(0.0, 1.0, uv.y));
+
+	col += aurora_a.rgb * aurora_band(uv, t, 0.34, 4.0, 0.20) * aurora_strength;
+	col += aurora_b.rgb * aurora_band(uv, t * 0.75 + 2.0, 0.62, 3.0, 0.26) * aurora_strength * 0.75;
+
+	// Звёздное поле: разреженная сетка с мерцанием.
+	vec2 gv = uv * vec2(240.0, 135.0);
+	vec2 cell = floor(gv);
+	float h = hash21(cell);
+	float star = step(1.0 - star_amount * 0.02, h);
+	float twinkle = 0.45 + 0.55 * sin(TIME * (1.2 + h * 5.0) + h * 30.0);
+	float d = length(fract(gv) - 0.5);
+	col += vec3(0.85, 0.92, 1.0) * star * twinkle * smoothstep(0.42, 0.0, d);
+
+	// Виньетка по краям кадра.
+	float v = distance(uv, vec2(0.5, 0.5));
+	col *= 1.0 - smoothstep(0.32, 0.95, v) * vignette_strength;
+
+	COLOR = vec4(col, 1.0);
+}

shaders/menu_background.gdshader.uid

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+uid://om0dt8so0gns

shaders/menu_background_material.tres

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+[gd_resource type="ShaderMaterial" format=3 uid="uid://6nshffib001t"]
+
+[ext_resource type="Shader" path="res://shaders/menu_background.gdshader" id="1_ctg3t"]
+
+[resource]
+shader = ExtResource("1_ctg3t")
+shader_parameter/color_top = Color(0.035, 0.043, 0.098, 1)
+shader_parameter/color_bottom = Color(0.02, 0.106, 0.133, 1)
+shader_parameter/aurora_a = Color(0.18, 0.85, 0.76, 1)
+shader_parameter/aurora_b = Color(0.47, 0.36, 0.96, 1)
+shader_parameter/speed = 0.12
+shader_parameter/aurora_strength = 0.55
+shader_parameter/star_amount = 0.45
+shader_parameter/vignette_strength = 0.65