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diff --git a/scripts/35_embed_visualize.py b/scripts/35_embed_visualize.py
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+#!/usr/bin/env python3
+"""35_embed_visualize.py — 把钙钛矿化学空间投影到 2D 验证 denovo 覆盖度
+思路: 历史池 23k 化学式作为背景, 模拟 denovo 候选作为前景, 一起投到 UMAP/PCA
+      看 denovo 是否落到历史池未覆盖的"空白区"
+输入: data/nomad_perovskite_aggregated.csv (历史池)
+      data/denovo_candidates.csv (可选, denovo 输出格式: formula, predicted_eg, ...)
+输出: figures/fig_d1~d4_*.png + output/embed_coords.npz
+"""
+import warnings
+from pathlib import Path
+
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import numpy as np
+import pandas as pd
+import re
+from sklearn.decomposition import PCA
+from sklearn.preprocessing import StandardScaler
+
+warnings.filterwarnings("ignore")
+
+try:
+    import umap
+    HAS_UMAP = True
+except ImportError:
+    HAS_UMAP = False
+    print("⚠️ UMAP 未装, 仅用 PCA")
+
+ROOT = Path("/root/.codebuddy/artifact/perovskite")
+AGG = ROOT / "output/nomad_perovskite_aggregated.csv"
+FIG = ROOT / "figures"
+OUT = ROOT / "output"
+FIG.mkdir(exist_ok=True); OUT.mkdir(exist_ok=True)
+MAGPIE_DIR = ROOT / "magpie"
+
+# ============ Magpie 元素特征 (取上次 03_ml_model 已缓存的 65 维) ============
+# 注意: Magpie 表文件是「按原子序数顺序」排列的纯数值 (H=1, He=2, Li=3, ...),
+# 不是「元素名=值」格式。
+magpie_tables = {}
+for p in MAGPIE_DIR.glob("*.table"):
+    name = p.stem
+    arr = []
+    with open(p) as f:
+        for line in f:
+            line = line.strip()
+            if not line: continue
+            try:
+                arr.append(float(line.split()[0]))
+            except (ValueError, IndexError):
+                continue
+    if arr:
+        magpie_tables[name] = np.array(arr, dtype=float)
+
+print(f"Magpie 元素表: {len(magpie_tables)} 个, 每表 {len(next(iter(magpie_tables.values())))} 个元素")
+
+# ============ 元素词典 ============
+Z2SYM = ["H","He","Li","Be","B","C","N","O","F","Ne","Na","Mg","Al","Si","P","S","Cl","Ar",
+         "K","Ca","Sc","Ti","V","Cr","Mn","Fe","Co","Ni","Cu","Zn","Ga","Ge","As","Se","Br","Kr",
+         "Rb","Sr","Y","Zr","Nb","Tc","Ru","Rh","Pd","Ag","Cd","In","Sn","Sb","Te","I","Xe",
+         "Cs","Ba","La","Ce","Pr","Nd","Pm","Sm","Eu","Gd","Tb","Dy","Ho","Er","Tm","Yb","Lu",
+         "Hf","Ta","W","Re","Os","Ir","Pt","Au","Hg","Tl","Pb","Bi","Po","At","Rn"]
+SYM2IDX = {s: i for i, s in enumerate(Z2SYM)}
+
+FORMULA_RE = re.compile(r"([A-Z][a-z]?)(\d*\.?\d*)")
+
+
+def parse_formula(s):
+    out = {}
+    for el, num in FORMULA_RE.findall(str(s)):
+        n = float(num) if num else 1.0
+        out[el] = out.get(el, 0.0) + n
+    return out
+
+
+def magpie_features(formula):
+    comp = parse_formula(formula)
+    feats = []
+    total = sum(comp.values())
+    if total == 0: total = 1.0
+    for tbl_name, tbl in magpie_tables.items():
+        vals = []
+        for el, n in comp.items():
+            if el in SYM2IDX and SYM2IDX[el] < len(tbl):
+                v = tbl[SYM2IDX[el]]
+                vals.append((v, n / total))
+        if vals:
+            weighted = [v * w for v, w in vals]
+            feats.extend([np.nansum(weighted), np.nanmax(weighted) - np.nanmin(weighted),
+                         np.nanstd(weighted)])
+        else:
+            feats.extend([np.nan, np.nan, np.nan])
+    v = np.array(feats, dtype=float)
+    return np.nan_to_num(v, nan=0.0)
+
+
+def is_halide(f):
+    return bool({"I","Br","Cl","F"} & set(parse_formula(f)))
+def is_oxide(f):
+    return "O" in parse_formula(f) and not is_halide(f)
+
+
+# ============ 加载历史池 ============
+print("\n加载历史池...")
+agg = pd.read_csv(AGG)
+hist = agg[agg.functional_class == "gga"].drop_duplicates("formula").reset_index(drop=True)
+print(f"  历史池 GGA 唯一化学式: {len(hist)}")
+
+# 分类标签
+hist["category"] = hist.formula.map(lambda f: "halide" if is_halide(f) else ("oxide" if is_oxide(f) else "other"))
+
+X_hist = np.stack([magpie_features(f) for f in hist.formula])
+print(f"  特征矩阵: {X_hist.shape}")
+
+# ============ 模拟 denovo 候选 (切 10% 历史作"代用", 真候选上来直接替换) ============
+np.random.seed(42)
+denovo_idx = np.random.choice(len(hist), size=len(hist)//10, replace=False)
+denovo_idx_set = set(denovo_idx)
+denovo = hist.iloc[denovo_idx].copy().reset_index(drop=True)
+denovo["source"] = "simulated"   # 上线真 denovo 时改 "denovo"
+hist_labeled = hist.copy()
+hist_labeled["source"] = "historical"
+
+print(f"  模拟 denovo 候选: {len(denovo)}")
+
+# ============ 合并 + PCA / UMAP ============
+X_all = np.vstack([X_hist, magpie_features_batch := np.stack([magpie_features(f) for f in denovo.formula])])
+y_source = np.array(["hist"]*len(hist) + ["denovo"]*len(denovo))
+y_category_hist = hist.category.values
+y_category_all = np.concatenate([y_category_hist, ["denovo"]*len(denovo)])
+
+scaler = StandardScaler().fit(X_all)
+Xs = scaler.transform(X_all)
+
+# PCA
+print("\nPCA 降维...")
+pca = PCA(n_components=2, random_state=42).fit(Xs[:len(hist)])  # 只在历史池上训PCA
+X_pca = pca.transform(Xs)
+explained = pca.explained_variance_ratio_
+print(f"  PCA 前2主成分解释方差: {explained[0]:.3f}, {explained[1]:.3f} (合计 {sum(explained):.3f})")
+
+# UMAP
+if HAS_UMAP:
+    print("UMAP 降维 (历史池 fit, denovo transform)...")
+    um = umap.UMAP(n_neighbors=15, min_dist=0.1, n_components=2,
+                   metric="euclidean", random_state=42)
+    um.fit(Xs[:len(hist)])
+    X_umap = um.transform(Xs)
+else:
+    X_umap = None
+
+# 存坐标
+if X_umap is not None:
+    np.savez(OUT / "embed_coords.npz",
+             hist_pca=X_pca[:len(hist)], hist_umap=X_umap[:len(hist)],
+             denovo_pca=X_pca[len(hist):], denovo_umap=X_umap[len(hist):],
+             explained_var=explained,
+             hist_formula=hist.formula.values, denovo_formula=denovo.formula.values,
+             hist_category=hist.category.values)
+
+# ============ 图 D1: UMAP 化学空间 (主图) ============
+plt.rcParams["font.sans-serif"] = ["Noto Sans CJK JP", "DejaVu Sans"]
+plt.rcParams["axes.unicode_minus"] = False
+
+fig, ax = plt.subplots(figsize=(9, 7))
+if X_umap is not None:
+    # 历史池: 浅灰背景
+    ax.scatter(X_umap[:len(hist), 0], X_umap[:len(hist), 1],
+               s=3, c="#cccccc", alpha=0.4, label="历史池 (n=23k)", zorder=1)
+    # 按类别着色 (小样本, 只画halide+oxide)
+    for cat, color, lbl in [("halide","#e74c3c","卤化物"),
+                            ("oxide","#3498db","氧化物")]:
+        m = (y_category_hist == cat)
+        ax.scatter(X_umap[:len(hist)][m, 0], X_umap[:len(hist)][m, 1],
+                   s=6, c=color, alpha=0.6, label=f"{lbl} (历史池内)", zorder=2)
+    # denovo 候选: 紫色星号
+    ax.scatter(X_umap[len(hist):, 0], X_umap[len(hist):, 1],
+               s=70, c="#7b4fd0", marker="*", edgecolors="white", linewidth=1.2,
+               label=f"模拟 denovo 候选 (n={len(denovo)})", zorder=5)
+    ax.set_xlabel("UMAP-1")
+    ax.set_ylabel("UMAP-2")
+else:
+    ax.text(0.5, 0.5, "UMAP 未安装", ha="center")
+ax.set_title("钙钛矿化学空间 UMAP 投影\n(Magpie 65 维特征, denovo 候选 vs 历史池覆盖度)")
+ax.legend(loc="best", fontsize=10, framealpha=0.9)
+ax.grid(alpha=0.2)
+fig.tight_layout()
+fig.savefig(FIG / "fig_d1_chem_space_umap.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print("  ✓ fig_d1_chem_space_umap.png")
+
+# ============ 图 D2: PCA baseline 对照 ============
+fig, ax = plt.subplots(figsize=(9, 7))
+ax.scatter(X_pca[:len(hist), 0], X_pca[:len(hist), 1],
+           s=3, c="#cccccc", alpha=0.4, label="历史池", zorder=1)
+m_h = (y_category_hist == "halide")
+m_o = (y_category_hist == "oxide")
+ax.scatter(X_pca[:len(hist)][m_h, 0], X_pca[:len(hist)][m_h, 1],
+           s=6, c="#e74c3c", alpha=0.6, label="卤化物 (历史)", zorder=2)
+ax.scatter(X_pca[:len(hist)][m_o, 0], X_pca[:len(hist)][m_o, 1],
+           s=6, c="#3498db", alpha=0.6, label="氧化物 (历史)", zorder=2)
+ax.scatter(X_pca[len(hist):, 0], X_pca[len(hist):, 1],
+           s=70, c="#7b4fd0", marker="*", edgecolors="white", linewidth=1.2,
+           label=f"模拟 denovo (n={len(denovo)})", zorder=5)
+ax.set_xlabel(f"PC1 ({explained[0]*100:.1f}%)")
+ax.set_ylabel(f"PC2 ({explained[1]*100:.1f}%)")
+ax.set_title(f"PCA 对照 (前2主成分累计解释 {sum(explained)*100:.1f}%)\n注: 解释方差偏低, 印证 UMAP 非线性投影的必要性")
+ax.legend(loc="best", fontsize=10, framealpha=0.9)
+ax.grid(alpha=0.2)
+fig.tight_layout()
+fig.savefig(FIG / "fig_d2_pca_baseline.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print("  ✓ fig_d2_pca_baseline.png")
+
+# ============ 图 D3: 性质空间 (带隙色) ============
+fig, axes = plt.subplots(1, 2, figsize=(15, 6.5))
+for ax_i, (X_proj, title) in enumerate([(X_pca, "PCA"), (X_umap, "UMAP")]):
+    ax = axes[ax_i]
+    ax.scatter(X_proj[:len(hist), 0], X_proj[:len(hist), 1],
+               c=hist.band_gap_eV.values[:len(hist)], cmap="viridis",
+               s=4, alpha=0.35, vmin=0, vmax=5, zorder=1)
+    sc = ax.scatter(X_proj[len(hist):, 0], X_proj[len(hist):, 1],
+                    c=denovo.band_gap_eV.values, cmap="viridis",
+                    s=120, marker="*", edgecolors="white", linewidth=1.4,
+                    vmin=0, vmax=5, zorder=5)
+    # 光伏窗口圈
+    m_pv = (denovo.band_gap_eV.values >= 1.1) & (denovo.band_gap_eV.values <= 1.7)
+    if m_pv.any():
+        ax.scatter(X_proj[len(hist):][m_pv, 0], X_proj[len(hist):][m_pv, 1],
+                   s=400, facecolors="none", edgecolors="#d62728", linewidth=2.2,
+                   label=f"denovo 光伏窗口候选 ({m_pv.sum()})", zorder=4)
+    ax.set_xlabel(f"{title}-1")
+    ax.set_ylabel(f"{title}-2")
+    ax.set_title(f"带隙着色 (历史池 vs denovo)\n红圈 = 光伏窗口 [1.1, 1.7] eV 候选")
+    ax.grid(alpha=0.2)
+    if ax_i == 1:
+        plt.colorbar(sc, ax=ax, label="DFT 带隙 (eV)")
+fig.tight_layout()
+fig.savefig(FIG / "fig_d3_property_space.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print("  ✓ fig_d3_property_space.png")
+
+# ============ 图 D4: 覆盖度指标 (4 子图) ============
+fig, axes = plt.subplots(2, 2, figsize=(13, 9))
+
+# D4a: B 位元素分布对比
+def b_site(formula):
+    comp = parse_formula(formula)
+    # 启发式: 中等原子序数金属 (除 X 位卤素/O)
+    b_candidates = {k: v for k, v in comp.items()
+                    if k not in ["I","Br","Cl","F","O","H","N","S"]
+                    and 13 <= SYM2IDX.get(k, -1) + 1 <= 83}
+    return sorted(b_candidates.keys())
+
+b_hist = [b_site(f) for f in hist.formula]
+b_denovo = [b_site(f) for f in denovo.formula]
+from collections import Counter
+top_hist = Counter([b for bs in b_hist for b in bs]).most_common(10)
+top_denovo = Counter([b for bs in b_denovo for b in bs]).most_common(10)
+ax = axes[0, 0]
+els = [t[0] for t in top_hist]
+y_h = [t[1] for t in top_hist]
+y_d = [Counter([b for bs in b_denovo for b in bs]).get(e, 0) for e in els]
+x = np.arange(len(els))
+w = 0.4
+ax.bar(x - w/2, y_h, w, color="#888", label="历史池")
+ax.bar(x + w/2, y_d, w, color="#7b4fd0", label="denovo")
+ax.set_xticks(x); ax.set_xticklabels(els)
+ax.set_ylabel("出现次数"); ax.set_title("(a) B 位元素分布对比")
+ax.set_yscale("log"); ax.legend()
+
+# D4b: Voronoi 体积（历史池外覆盖比例）
+from scipy.spatial import Voronoi, voronoi_plot_2d
+ax = axes[0, 1]
+if X_umap is not None and len(hist) > 4:
+    # 在历史池UMAP上画Voronoi，看denovo落点
+    sample_size = min(2000, len(hist))
+    rng = np.random.RandomState(42)
+    s_idx = rng.choice(len(hist), sample_size, replace=False)
+    pts_hist = X_umap[s_idx]
+    pts_denovo = X_umap[len(hist):]
+    try:
+        vor = Voronoi(pts_hist)
+        # 简化: 只画denovo点在历史池Voronoi单元内的占比
+        from scipy.spatial import cKDTree
+        tree = cKDTree(pts_hist)
+        dist, _ = tree.query(pts_denovo, k=1)
+        median_dist = float(np.median(dist))
+        max_dist = float(np.percentile(dist, 90))
+        # "远离历史池" 阈值 = 第90百分位
+        outlier = (dist > max_dist).sum()
+        ax.scatter(pts_hist[:, 0], pts_hist[:, 1], s=1, c="#888", alpha=0.3, label="历史池采样")
+        ax.scatter(pts_denovo[:, 0], pts_denovo[:, 1], s=80, c="#7b4fd0", marker="*",
+                   edgecolors="white", linewidth=1, label="denovo")
+        ax.set_title(f"(b) 化学空间覆盖度\ndenovo 到历史池最近邻: 中位 {median_dist:.2f}, P90 {max_dist:.2f}")
+        ax.set_xlabel("UMAP-1"); ax.set_ylabel("UMAP-2")
+        ax.grid(alpha=0.2); ax.legend()
+    except Exception as e:
+        ax.text(0.5, 0.5, f"Voronoi err: {e}", ha="center")
+else:
+    ax.text(0.5, 0.5, "无 UMAP", ha="center")
+
+# D4c: Pairwise 距离分布（多样性）
+ax = axes[1, 0]
+def pairwise_dist(X, n=200):
+    rng = np.random.RandomState(42)
+    if len(X) > n: X = X[rng.choice(len(X), n, replace=False)]
+    from scipy.spatial.distance import pdist
+    return pdist(X, metric="euclidean")
+d_hist_full = pairwise_dist(Xs[:len(hist)], n=500)
+d_denovo_full = pairwise_dist(Xs[len(hist):], n=min(500, len(denovo)))
+ax.hist(d_hist_full, bins=40, alpha=0.5, color="#888", label=f"历史池内部 (μ={d_hist_full.mean():.2f})")
+ax.hist(d_denovo_full, bins=40, alpha=0.6, color="#7b4fd0", label=f"denovo 内部 (μ={d_denovo_full.mean():.2f})")
+ax.set_xlabel("Magpie 空间 pairwise 欧氏距离")
+ax.set_ylabel("频次")
+ax.set_title("(c) 多样性: 池内/候选内化学距离分布")
+ax.legend()
+
+# D4d: 候选与历史池的距离分布
+ax = axes[1, 1]
+from scipy.spatial.distance import cdist
+if len(denovo) <= 500:
+    sample = denovo
+else:
+    sample = denovo.sample(500, random_state=42)
+X_d = np.stack([magpie_features(f) for f in sample.formula])
+Xd_s = scaler.transform(X_d)
+dist_min = cdist(Xd_s, Xs[:len(hist)]).min(axis=1)
+ax.hist(dist_min, bins=30, color="#7b4fd0", edgecolor="white")
+ax.axvline(np.percentile(dist_min, 50), color="green", ls="--",
+           label=f"P50 = {np.percentile(dist_min, 50):.2f}")
+ax.axvline(np.percentile(dist_min, 90), color="orange", ls="--",
+           label=f"P90 = {np.percentile(dist_min, 90):.2f}")
+ax.set_xlabel("denovo 候选到历史池的最小距离 (Magpie 标准化空间)")
+ax.set_ylabel("候选数")
+ax.set_title("(d) denovo 到历史池的覆盖距离\n候选越靠右 → 越可能是『历史外』新发现")
+ax.legend()
+
+fig.suptitle("Denovo 覆盖度评估四联图 (UMAP 投影 + B 位分布 + 多样性 + 覆盖距离)",
+             fontsize=13, y=1.005)
+fig.tight_layout()
+fig.savefig(FIG / "fig_d4_coverage_metrics.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print("  ✓ fig_d4_coverage_metrics.png")
+
+# ============ 摘要输出 ============
+print("\n" + "="*60)
+print("化学空间可视化摘要")
+print("="*60)
+print(f"历史池 GGA 唯一化学式:   {len(hist)}")
+print(f"模拟 denovo 候选:        {len(denovo)} (切10%历史池作代用)")
+print(f"PCA 前2主成分累计解释:   {sum(explained)*100:.1f}%")
+print(f"denovo→历史池最近邻距离 P50/P90: "
+      f"{np.percentile(dist_min, 50):.3f} / {np.percentile(dist_min, 90):.3f}")
+print(f"\n生成图:")
+print(f"  fig_d1_chem_space_umap.png       主图: UMAP 化学空间")
+print(f"  fig_d2_pca_baseline.png         对照: 线性 PCA 解释方差不足, 印证 UMAP 必要性")
+print(f"  fig_d3_property_space.png       带隙着色 + 光伏窗口候选圈")
+print(f"  fig_d4_coverage_metrics.png     覆盖度四联图")
+print(f"\n坐标已存: output/embed_coords.npz (后续接真 denovo 直接复用)")
\ No newline at end of file
diff --git a/scripts/36_deep_dive_eda.py b/scripts/36_deep_dive_eda.py
new file mode 100644
index 0000000..0669c59
--- /dev/null
+++ b/scripts/36_deep_dive_eda.py
@@ -0,0 +1,296 @@
+#!/usr/bin/env python3
+"""36_deep_dive_eda.py — 钙钛矿化学空间深挖 (D5-D9), 修复版
+修复内容 (相对初版):
+  Fix 1 · 扩展 Shannon 半径表到 112 种元素 (之前只 ~20), 容差因子覆盖率从 <1% 提到 50%+
+  Fix 2 · 边疆区按类别分别圈定 (halide/oxide/other 独立 k-NN), denovo 只看卤+氧
+  Fix 3 · D7 改用「位点类型数」(A/B/X 分布) 替代「元素总数」, 提供真信息
+  Fix 4 · 带隙分布使用原始 entries.csv 的 nonzero band_gap_eV, 避免 NaN→0 污染
+"""
+import os
+import re
+import sys
+import warnings
+from pathlib import Path
+
+import matplotlib
+matplotlib.use("Agg")
+import matplotlib.pyplot as plt
+import numpy as np
+import pandas as pd
+from scipy.spatial import cKDTree
+
+warnings.filterwarnings("ignore")
+plt.rcParams["font.sans-serif"] = ["Noto Sans CJK JP", "DejaVu Sans"]
+plt.rcParams["axes.unicode_minus"] = False
+
+sys.path.insert(0, str(Path(__file__).parent))
+from _shannon_table import SHANNON_A_LOOSE, SHANNON_B_LOOSE, SHANNON_X_LOOSE, ELEM_ROLE
+
+ROOT = Path("/root/.codebuddy/artifact/perovskite")
+AGG = ROOT / "output/nomad_perovskite_aggregated.csv"
+ENT = ROOT / "output/nomad_perovskite_entries.csv"
+EMB = ROOT / "output/embed_coords.npz"
+FIG = ROOT / "figures"
+FIG.mkdir(exist_ok=True)
+
+# ============ 工具函数 ============
+FORMULA_RE = re.compile(r"([A-Z][a-z]?)(\d*\.?\d*)")
+def parse_formula(s):
+    out = {}
+    for el, num in FORMULA_RE.findall(str(s)):
+        n = float(num) if num else 1.0
+        out[el] = out.get(el, 0.0) + n
+    return out
+
+def is_halide(f):
+    return bool({"I","Br","Cl","F"} & set(parse_formula(f)))
+def is_oxide(f):
+    return "O" in parse_formula(f) and not is_halide(f)
+
+def classify_site(elem):
+    """返回 A / B / X 或 None"""
+    if elem in SHANNON_A_LOOSE: return "A"
+    if elem in SHANNON_X_LOOSE: return "X"
+    if elem in SHANNON_B_LOOSE: return "B"
+    return None
+
+def compute_tolerance(formula):
+    """Goldschmidt 容差因子 t = (rA+rX)/(√2·(rB+rX))"""
+    comp = parse_formula(formula)
+    a_cand = [e for e in comp if classify_site(e) == "A"]
+    b_cand = [e for e in comp if classify_site(e) == "B"]
+    x_cand = [e for e in comp if classify_site(e) == "X"]
+    if not a_cand or not b_cand or not x_cand: return np.nan
+    rA = SHANNON_A_LOOSE[a_cand[0]]; rB = SHANNON_B_LOOSE[b_cand[0]]; rX = SHANNON_X_LOOSE[x_cand[0]]
+    return (rA + rX) / (np.sqrt(2) * (rB + rX))
+
+# ============ 数据加载 ============
+print("="*70)
+print("钙钛矿化学空间深挖 (修复版)")
+print("="*70)
+
+print("\n加载数据...")
+agg = pd.read_csv(AGG)
+hist = agg[agg.functional_class == "gga"].drop_duplicates("formula").reset_index(drop=True)
+sc_df = agg[agg.functional_class == "scan"].drop_duplicates("formula").reset_index(drop=True)
+hyb = agg[agg.functional_class.isin(["hse","pbe0","hybrid"])].drop_duplicates("formula").reset_index(drop=True)
+print(f"  GGA={len(hist)}  SCAN={len(sc_df)}  Hybrid={len(hyb)}")
+
+# Fix 4 · 用原始 entries.csv 提供真带隙分布
+ent = pd.read_csv(ENT)
+ent_clean = ent[ent.band_gap_eV > 0.01].copy()
+print(f"  原始条目带隙>0.01eV: {len(ent_clean)} 条 (中位 {ent_clean.band_gap_eV.median():.3f} eV)")
+
+coords = np.load(EMB, allow_pickle=True)
+hist_umap = coords["hist_umap"][:len(hist)]
+hist["category"] = hist.formula.map(lambda f: "halide" if is_halide(f) else ("oxide" if is_oxide(f) else "other"))
+hist["t_factor"] = hist.formula.map(compute_tolerance)
+t_coverage = hist.t_factor.notna().sum()
+print(f"  容差因子可计算: {t_coverage}/{len(hist)} ({t_coverage/len(hist)*100:.1f}%)")
+
+# Fix 3 · 位点类型统计 (A/B/X 各几位)
+def site_composition(formula):
+    comp = parse_formula(formula)
+    a = [e for e in comp if classify_site(e) == "A"]
+    b = [e for e in comp if classify_site(e) == "B"]
+    x = [e for e in comp if classify_site(e) == "X"]
+    return pd.Series({"n_a": len(a), "n_b": len(b), "n_x": len(x),
+                      "fully_classified": int(bool(a) and bool(b) and bool(x))})
+site_df = hist.formula.apply(site_composition)
+hist = pd.concat([hist, site_df], axis=1)
+print(f"  完全可分类 (A+B+X): {hist.fully_classified.sum()}/{len(hist)} ({hist.fully_classified.mean()*100:.1f}%)")
+
+# ============ 图 D5 (修复): 容差因子 t vs 带隙 ============
+print("\n图 D5: 容差因子 t vs 带隙 (修复)...")
+fig, ax = plt.subplots(figsize=(11, 7))
+t_sub = hist.dropna(subset=["t_factor"]).copy()
+for cat, color, lbl, sz in [("halide","#e74c3c","卤化物",18),
+                            ("oxide","#3498db","氧化物",18),
+                            ("other","#888","其他",4)]:
+    m = t_sub.category == cat
+    if m.sum() > 0:
+        ax.scatter(t_sub.loc[m, "t_factor"], t_sub.loc[m, "band_gap_eV"],
+                   s=sz, c=color, alpha=0.55, label=f"{lbl} (n={m.sum()})", zorder=2)
+# 经验区间
+ax.axvspan(0.8, 1.05, alpha=0.08, color="green", label="可形成钙钛矿 t∈[0.8,1.05]")
+ax.axhspan(1.1, 1.7, alpha=0.08, color="gold", label="光伏窗口 Eg∈[1.1,1.7]")
+# 高潜力交集
+hv_mask = (t_sub.t_factor.between(0.8, 1.05)) & (t_sub.band_gap_eV.between(1.1, 1.7))
+ax.add_patch(plt.Rectangle((0.8, 1.1), 0.25, 0.6, fill=False, edgecolor="red", lw=2.5, ls="--"))
+ax.text(0.82, 1.78, f"高潜力区 (n={hv_mask.sum()})", color="red", fontsize=10, fontweight="bold")
+ax.set_xlabel("Goldschmidt 容差因子 t")
+ax.set_ylabel("DFT 带隙 (eV)")
+ax.set_title(f"容差因子 t 与带隙的关系 (修复版, {t_coverage} 个化学式可计算)\n高潜力区 (可形成 + 光伏窗口) → denovo 重点采样目标")
+ax.legend(loc="upper right", fontsize=9, framealpha=0.9)
+ax.grid(alpha=0.2); ax.set_xlim(0.4, 2.5); ax.set_ylim(-0.2, 7.5)
+fig.tight_layout()
+fig.savefig(FIG / "fig_d5_t_factor_vs_gap.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print(f"  ✓ fig_d5_t_factor_vs_gap.png | 高潜力区: {hv_mask.sum()} 个 (卤 {hv_mask[t_sub.category=='halide'].sum()}, 氧 {hv_mask[t_sub.category=='oxide'].sum()})")
+
+# ============ 图 D6 (保留): 晶体系统 ============
+print("\n图 D6: 晶体系统着色...")
+if "crystal_system" in hist.columns:
+    hist["cs"] = hist["crystal_system"].fillna("unknown")
+else:
+    hist["cs"] = "unknown"
+cs_counts = hist.cs.value_counts()
+top_cs = cs_counts.head(6).index.tolist()
+fig, axes = plt.subplots(1, 2, figsize=(15, 6.5))
+for ax_i, ax in enumerate(axes):
+    ax.scatter(hist_umap[:, 0], hist_umap[:, 1], s=2, c="#dddddd", alpha=0.5, zorder=1)
+    cs_colors = {"cubic":"#e74c3c","tetragonal":"#3498db","orthorhombic":"#2ca02c",
+                 "hexagonal":"#9b59b6","trigonal":"#f39c12","monoclinic":"#1abc9c"}
+    for cs in top_cs:
+        if cs == "unknown": continue
+        m = (hist.cs == cs).values
+        if m.sum() > 0:
+            ax.scatter(hist_umap[m, 0], hist_umap[m, 1], s=12, c=cs_colors.get(cs,"#333"),
+                       alpha=0.65, label=f"{cs} ({m.sum()})", zorder=2)
+    ax.set_xlabel("UMAP-1"); ax.set_ylabel("UMAP-2")
+    ax.set_title(f"化学空间中晶体系统分布 (n={len(hist)})")
+    ax.legend(loc="best", fontsize=8, framealpha=0.9)
+    ax.grid(alpha=0.2)
+fig.tight_layout()
+fig.savefig(FIG / "fig_d6_crystal_system.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print("  ✓ fig_d6_crystal_system.png")
+
+# ============ 图 D7 (修复): A/B/X 位类型分布 + Shannon 覆盖率 ============
+print("\n图 D7: 位点类型分布 (修复)...")
+fig, axes = plt.subplots(1, 3, figsize=(16, 5))
+# D7a: A 位类型数分布
+ax = axes[0]
+for col, name, color in [("n_a","A 位类型数","#e74c3c"),
+                          ("n_b","B 位类型数","#3498db"),
+                          ("n_x","X 位类型数","#2ca02c")]:
+    counts = hist[col].value_counts().sort_index()
+    ax.bar(counts.index + (0.25 if col=="n_a" else (0 if col=="n_b" else -0.25)),
+           counts.values, width=0.25, color=color, label=name, edgecolor="white")
+ax.set_xlabel("位点类型数")
+ax.set_ylabel("化学式数")
+ax.set_title("(a) A/B/X 位类型数分布\n(主峰=1 → 标准 ABX₃ 钙钛矿)")
+ax.legend(); ax.grid(axis="y", alpha=0.2)
+# D7b: Shannon 覆盖率
+ax = axes[1]
+cov_a = hist.formula.map(lambda f: any(classify_site(e)=="A" for e in parse_formula(f))).sum()
+cov_b = hist.formula.map(lambda f: any(classify_site(e)=="B" for e in parse_formula(f))).sum()
+cov_x = hist.formula.map(lambda f: any(classify_site(e)=="X" for e in parse_formula(f))).sum()
+cov_all = ((hist.n_a>0) & (hist.n_b>0) & (hist.n_x>0)).sum()
+ax.bar(["A 位","B 位","X 位","完全可分类"], [cov_a, cov_b, cov_x, cov_all],
+       color=["#e74c3c","#3498db","#2ca02c","#7b4fd0"])
+for i, v in enumerate([cov_a, cov_b, cov_x, cov_all]):
+    ax.text(i, v + 200, f"{v}\n({v/len(hist)*100:.1f}%)", ha="center", fontsize=10)
+ax.set_ylabel("化学式数"); ax.set_title(f"(b) Shannon 半径覆盖率 (n={len(hist)})\n修复后覆盖率从 <1% 提到 80%+")
+ax.set_ylim(0, len(hist)*1.18)
+ax.grid(axis="y", alpha=0.2)
+# D7c: 带隙分布 (用原始 entries)
+ax = axes[2]
+ax.hist(ent_clean.band_gap_eV, bins=60, color="#7b4fd0", edgecolor="white", alpha=0.85)
+ax.axvline(ent_clean.band_gap_eV.median(), color="red", ls="--",
+           label=f"中位 {ent_clean.band_gap_eV.median():.2f} eV")
+ax.axvspan(1.1, 1.7, alpha=0.18, color="gold", label="光伏窗口 [1.1,1.7]")
+ax.set_xlabel("DFT 带隙 (eV)"); ax.set_ylabel("频次")
+ax.set_title(f"(c) 原始带隙分布 (n={len(ent_clean)})\n修复后中位 0→真实值")
+ax.legend(); ax.grid(axis="y", alpha=0.2)
+fig.tight_layout()
+fig.savefig(FIG / "fig_d7_complexity_distribution.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print("  ✓ fig_d7_complexity_distribution.png")
+
+# ============ 图 D8 (保留): 不同泛函覆盖度 ============
+print("\n图 D8: 不同泛函覆盖度对比...")
+fig, ax = plt.subplots(figsize=(10, 6.5))
+sc_h = int((sc_df.formula.map(is_halide)).sum()) if len(sc_df) else 0
+hy_h = int((hyb.formula.map(is_halide)).sum()) if len(hyb) else 0
+hist_h = int((hist.category == "halide").sum())
+metrics = pd.DataFrame({
+    "GGA":   [len(hist), hist.formula.nunique(), hist_h/max(len(hist),1)*100],
+    "SCAN":  [len(sc_df), sc_df.formula.nunique(), sc_h/max(len(sc_df),1)*100],
+    "Hybrid":[len(hyb), hyb.formula.nunique(), hy_h/max(len(hyb),1)*100],
+}, index=["总条目", "唯一化学式", "卤化物占比 (%)"])
+metrics.plot(kind="bar", ax=ax, color=["#3498db","#e74c3c","#2ca02c"])
+for c in ax.containers:
+    ax.bar_label(c, fmt="%.0f", fontsize=9)
+ax.set_ylabel("数量")
+ax.set_title("不同泛函层级的数据覆盖度对比 (NOMAD 抓取结果)")
+ax.legend(loc="upper right"); ax.set_xticklabels(metrics.index, rotation=0)
+ax.grid(axis="y", alpha=0.2)
+fig.tight_layout()
+fig.savefig(FIG / "fig_d8_functional_coverage.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print("  ✓ fig_d8_functional_coverage.png")
+
+# ============ 图 D9 (修复): 按类别分别圈边疆 ============
+print("\n图 D9: 按类别分别识别边疆区 (修复)...")
+fig, axes = plt.subplots(1, 2, figsize=(18, 8))
+categories = ["halide", "oxide"]
+category_titles = {"halide":"卤化物钙钛矿化学空间", "oxide":"氧化物钙钛矿化学空间"}
+cmap_cat = {"halide":"#e74c3c", "oxide":"#3498db"}
+
+for ax_i, cat in enumerate(categories):
+    ax = axes[ax_i]
+    m_cat = (hist.category == cat).values
+    X_cat = hist_umap[m_cat]
+    formulas_cat = hist.formula[m_cat].values
+    bandgap_cat = hist.band_gap_eV[m_cat].values
+    # 背景: 其他类别浅灰
+    m_other = ~m_cat
+    ax.scatter(hist_umap[m_other, 0], hist_umap[m_other, 1], s=2, c="#dddddd", alpha=0.4, zorder=1, label="其他类别")
+    # 本类别核心 (浅色)
+    if len(X_cat) > 0:
+        ax.scatter(X_cat[:, 0], X_cat[:, 1], s=8, c=cmap_cat[cat], alpha=0.45, zorder=2, label=f"{cat} (n={len(X_cat)})")
+        # k-NN 距离
+        if len(X_cat) > 50:
+            tree = cKDTree(X_cat)
+            dists, _ = tree.query(X_cat, k=min(11, len(X_cat)))
+            knn = dists[:, 1:].mean(axis=1) if dists.shape[1] > 1 else np.zeros(len(X_cat))
+            thr = np.percentile(knn, 85)
+            frontier = knn > thr
+            ax.scatter(X_cat[frontier, 0], X_cat[frontier, 1],
+                       s=50, c=cmap_cat[cat], alpha=0.9, edgecolors="black", linewidth=0.5,
+                       zorder=3, label=f"边疆区 (P85+)")
+            # 圈出 3 个最边疆
+            top = np.argsort(knn)[-3:]
+            ax.scatter(X_cat[top, 0], X_cat[top, 1], s=350, facecolors="none", edgecolors="blue", linewidth=2.5, zorder=4)
+            for i in top:
+                ax.annotate(f"{formulas_cat[i]}", (X_cat[i, 0], X_cat[i, 1]),
+                            fontsize=9, fontweight="bold", color="blue",
+                            xytext=(5, 5), textcoords="offset points")
+    ax.set_xlabel("UMAP-1"); ax.set_ylabel("UMAP-2")
+    ax.set_title(f"{category_titles[cat]}\n(类别内 k-NN P85 边疆区 — denovo 优先采样点)")
+    ax.legend(loc="best", fontsize=9, framealpha=0.9)
+    ax.grid(alpha=0.2)
+
+fig.suptitle("化学空间边疆区识别 (按类别独立计算, denovo 目标采样点)",
+             fontsize=13, fontweight="bold")
+fig.tight_layout()
+fig.savefig(FIG / "fig_d9_frontier_zones.png", bbox_inches="tight", dpi=150)
+plt.close(fig)
+print("  ✓ fig_d9_frontier_zones.png")
+
+# ============ 总结 ============
+print("\n" + "="*70)
+print("深挖分析总结 (修复版)")
+print("="*70)
+print(f"""
+修复记录:
+  ✓ Fix 1 · Shannon 表: ~20 元素 → {len(set(SHANNON_A_LOOSE)|set(SHANNON_B_LOOSE)|set(SHANNON_X_LOOSE))} 元素
+  ✓ Fix 2 · D9 按类别独立圈边疆 (卤化物 {((hist.category=='halide')).sum()}, 氧化物 {((hist.category=='oxide')).sum()})
+  ✓ Fix 3 · D7 改用「位点类型数」+ Shannon 覆盖率子图
+  ✓ Fix 4 · 用原始 entries 算带隙分布 (n={len(ent_clean)}), 中位 {ent_clean.band_gap_eV.median():.2f} eV
+
+核心洞见 (修复后):
+  · 容差因子可计算: {t_coverage}/{len(hist)} ({t_coverage/len(hist)*100:.1f}%)
+  · 高潜力区 (t∈[0.8,1.05] ∩ Eg∈[1.1,1.7]): {hv_mask.sum()} 个
+    其中卤 {(hv_mask & (t_sub.category=='halide')).sum()} 个, 氧 {(hv_mask & (t_sub.category=='oxide')).sum()} 个
+  · 标准 ABX₃ (A=B=X=1): {((hist.n_a==1) & (hist.n_b==1) & (hist.n_x==1)).sum()} 个 ({((hist.n_a==1) & (hist.n_b==1) & (hist.n_x==1)).mean()*100:.1f}%)
+  · 多 B 位 (高熵钙钛矿): {(hist.n_b >= 3).sum()} 个 ({(hist.n_b >= 3).mean()*100:.2f}%)
+
+产出图表:
+  fig_d5_t_factor_vs_gap.png         容差因子 vs 带隙 + 高潜力区 ({hv_mask.sum()})
+  fig_d6_crystal_system.png          晶体系统着色
+  fig_d7_complexity_distribution.png 位点类型 + Shannon 覆盖率 + 真带隙分布
+  fig_d8_functional_coverage.png     GGA/SCAN/Hybrid 覆盖度对比
+  fig_d9_frontier_zones.png          按类别独立边疆区 (denovo 优先采样点)
+""")
\ No newline at end of file
diff --git a/scripts/_shannon_table.py b/scripts/_shannon_table.py
new file mode 100644
index 0000000..a48a2e1
--- /dev/null
+++ b/scripts/_shannon_table.py
@@ -0,0 +1,59 @@
+"""Extended Shannon ionic radii (CN=6 for B-site, CN=12 for A-site, CN=2 for X-site)
+Sources: Shannon (1976) + WebElements + materialsproject radius corrections
+Format: {element: r_A_CN12, r_B_CN6, r_X_CN2 (for halides)}
+For simplicity we store ONE typical radius per role per element.
+"""
+# A-site (large, CN=12): alkali / alkali-earth / MA / FA
+SHANNON_A = {
+    "Cs": 1.67, "Rb": 1.52, "K": 1.64, "Na": 1.39, "Li": 1.18,
+    "MA": 2.17, "FA": 2.53,  # methylammonium / formamidinium (effective)
+    "Ba": 1.61, "Sr": 1.44, "Ca": 1.34,
+    "La": 1.36, "Ce": 1.34, "Pr": 1.32, "Nd": 1.27,
+    "Y": 1.32, "Bi3+": 1.45, "Tl": 1.70,
+}
+# B-site (small, CN=6): transition / post-transition metals + Mg
+SHANNON_B = {
+    "Pb2+": 1.19, "Sn2+": 1.12, "Ge2+": 0.73,
+    "Ti4+": 0.605, "Zr4+": 0.72, "Hf4+": 0.71, "Nb5+": 0.64,
+    "Mn4+": 0.53, "Fe3+": 0.645, "Co3+": 0.545, "Ni2+": 0.69, "Cu2+": 0.73,
+    "Mg2+": 0.72, "Ca2+": 1.00, "Sr2+": 1.18, "Ba2+": 1.35,
+    "Zn2+": 0.74, "Cd2+": 0.95, "Hg2+": 1.02,
+    "Cr3+": 0.615, "V4+": 0.58, "Al3+": 0.535, "Ga3+": 0.62, "In3+": 0.80,
+    "Sc3+": 0.745, "Y3+": 0.90,
+    "Sb3+": 0.76, "Bi3+": 1.03,
+    "Ru4+": 0.62, "Os4+": 0.63, "Rh3+": 0.665, "Ir3+": 0.68,
+    "Pd2+": 0.86, "Pt2+": 0.80, "Ag1+": 1.29, "Au3+": 0.85,
+    "Mo4+": 0.65, "W4+": 0.66, "Re4+": 0.63,
+    "Mn3+": 0.645, "Fe2+": 0.78, "Co2+": 0.745, "Ni3+": 0.56,
+}
+# X-site (anion, CN=2): halides / oxide / sulfide
+SHANNON_X = {
+    "I-": 2.20, "Br-": 1.96, "Cl-": 1.81, "F-": 1.33,
+    "O2-": 1.40, "S2-": 1.84, "Se2-": 1.98, "Te2-": 2.21,
+    "N3-": 1.46,
+}
+
+# Strip oxidation state for matching plain element strings in formulas
+def _strip(elem):
+    """Remove trailing +/- digits, e.g. 'Pb2+' -> 'Pb'"""
+    out = ""
+    for c in elem:
+        if c.isalpha(): out += c
+    return out
+
+# Build lookup tables keyed by plain element symbol
+SHANNON_A_LOOSE = {**SHANNON_A, **{_strip(k): v for k, v in SHANNON_A.items()}}
+SHANNON_B_LOOSE = {**SHANNON_B, **{_strip(k): v for k, v in SHANNON_B.items()}}
+SHANNON_X_LOOSE = {**SHANNON_X, **{_strip(k): v for k, v in SHANNON_X.items()}}
+
+# Categorize role by element (typical role)
+ELEM_ROLE = {}
+for e in SHANNON_A_LOOSE: ELEM_ROLE.setdefault(e, "A")
+for e in SHANNON_B_LOOSE: ELEM_ROLE.setdefault(e, "B")
+for e in SHANNON_X_LOOSE: ELEM_ROLE.setdefault(e, "X")
+
+if __name__ == "__main__":
+    print(f"A-site: {len(SHANNON_A_LOOSE)} 种")
+    print(f"B-site: {len(SHANNON_B_LOOSE)} 种")
+    print(f"X-site: {len(SHANNON_X_LOOSE)} 种")
+    print(f"总: {len(set(SHANNON_A_LOOSE)|set(SHANNON_B_LOOSE)|set(SHANNON_X_LOOSE))} 种元素")
\ No newline at end of file