feat: 沙香科技官网 v2.2 基线（深色科技风/双语/局域网+公网双部署）

tools/make_logo_light.py

@@ -0,0 +1,71 @@
+# -*- coding: utf-8 -*-
+"""
+生成深色站反白版 logo（logo-light.png）：
+1. flood-fill 镂空深蓝底（容差 84 = v1 验证成功参数，能吃掉 #000020 底色）
+2. 不透明内容亮度反转 L' = 1 - L（黑字→白字，红/青/绿提亮，色相保留）
+深色页黑字看不清、白底块又突兀，反白是深色站标准解法。
+用法: uv run --with pillow python3 tools/make_logo_light.py
+"""
+import colorsys
+from collections import deque
+
+from PIL import Image
+
+SRC = 'assets/img/logo.png'
+OUT = 'assets/img/logo-light.png'
+TOL = 84  # 曼哈顿距离容差（v1 实测：清除 83%、红色主体完整保留）
+
+im = Image.open(SRC).convert('RGBA')
+w, h = im.size
+px = im.load()
+
+# --- flood-fill 清底 ---
+corners = [px[0, 0], px[w-1, 0], px[0, h-1], px[w-1, h-1]]
+bg = tuple(sum(c[i] for c in corners) // 4 for i in range(3))
+
+def is_bg(p):
+    if p[3] < 10:
+        return True
+    return abs(p[0]-bg[0]) + abs(p[1]-bg[1]) + abs(p[2]-bg[2]) <= TOL
+
+seen = [[False]*w for _ in range(h)]
+q = deque()
+for x in range(w):
+    q.extend(((x, 0), (x, h-1)))
+for y in range(h):
+    q.extend(((0, y), (w-1, y)))
+cleared = 0
+while q:
+    x, y = q.popleft()
+    if x < 0 or x >= w or y < 0 or y >= h or seen[y][x]:
+        continue
+    seen[y][x] = True
+    p = px[x, y]
+    if not is_bg(p):
+        continue
+    px[x, y] = (0, 0, 0, 0)
+    cleared += 1
+    q.extend(((x+1, y), (x-1, y), (x, y+1), (x, y-1)))
+ratio = cleared / (w * h)
+assert 0.10 < ratio < 0.92, f'镂空异常: 清除 {ratio:.0%}'
+
+# --- 暗部提亮、亮部保留（logo 含 ~20% 浅色元素，全量反转会把它们变黑） ---
+# L' = max(L, 1-L)：暗像素翻到亮侧（黑→白），亮像素不动，色相全保留
+opaque = [px[x, y] for y in range(h) for x in range(w) if px[x, y][3] > 128]
+assert opaque, '镂空后内容为空'
+
+for y in range(h):
+    for x in range(w):
+        r, g, b, a = px[x, y]
+        if a == 0:
+            continue
+        hh, ll, ss = colorsys.rgb_to_hls(r / 255, g / 255, b / 255)
+        r2, g2, b2 = colorsys.hls_to_rgb(hh, max(ll, 1 - ll), ss)
+        px[x, y] = (round(r2 * 255), round(g2 * 255), round(b2 * 255), a)
+
+im.save(OUT, 'PNG', optimize=True)
+
+# 验证：反白后所有不透明像素亮度下限
+final = [px[x, y] for y in range(h) for x in range(w) if px[x, y][3] > 128]
+dark = sum(1 for p in final if 0.299*p[0]+0.587*p[1]+0.114*p[2] < 90) / len(final)
+print(f'完成: {OUT} 镂空 {ratio:.0%}，暗部像素剩 {dark:.1%}（应为 0）')