Use rated voltage options in selector

app/page.tsx

@@ -160,6 +160,12 @@ const SELECTOR_PRODUCTS = CATALOG_PRODUCTS.filter((product) =>
   };
 });
 
+const RATED_VOLTAGES = [...new Set(
+  SELECTOR_PRODUCTS
+    .map((product) => product.ratedVoltage)
+    .filter((voltage): voltage is number => voltage !== null),
+)].sort((a, b) => a - b);
+
 const DEFAULT_REQUIREMENTS: Requirements = {
   application: "",
   category: "全部舵机",
@@ -183,8 +189,7 @@ function getMatches(requirements: Requirements) {
     const categoryOk =
       requirements.category === "全部舵机" || requirements.category === product.category;
     const torqueOk = product.torque >= requirements.torque;
-    const voltageOk =
-      requirements.voltage >= product.voltageMin && requirements.voltage <= product.voltageMax;
+    const voltageOk = requirements.voltage === product.ratedVoltage;
     const weightOk =
       requirements.weightLimit === 0 || product.weight === null || product.weight <= requirements.weightLimit;
     const gearOk = requirements.gear === "不限" || requirements.gear === product.gear;
@@ -211,7 +216,7 @@ function getMatches(requirements: Requirements) {
 
     if (voltageOk) {
       score += 22;
-      reasons.push(`${requirements.voltage}V供电兼容`);
+      reasons.push(`${requirements.voltage}V额定电压匹配`);
     } else {
       score -= 90;
     }
@@ -413,7 +418,7 @@ export default function Home() {
                 <div className="question-step">
                   <p className="step-kicker">第二步 · 核心参数</p>
                   <h2>输入舵机的关键技术要求</h2>
-                  <p className="step-help">已覆盖243款舵机：0.09–920 kgf·cm、0.8–30V；不确定的项目可选“不限”。</p>
+                  <p className="step-help">已覆盖243款舵机：0.09–920 kgf·cm，并按官方目录额定电压精确筛选。</p>
                   <div className="two-fields compact-fields">
                     <label className="select-field">
                       <span>目标产品系列</span>
@@ -430,22 +435,15 @@ export default function Home() {
                       </select>
                     </label>
                     <label className="select-field">
-                      <span>系统工作电压（0.8–30V）</span>
-                      <input
-                        className="parameter-input"
-                        type="number"
-                        min="0.8"
-                        max="30"
-                        step="0.1"
-                        list="voltage-values"
+                      <span>额定电压</span>
+                      <select
                         value={requirements.voltage}
                         onChange={(event) => update("voltage", Number(event.target.value))}
-                      />
-                      <datalist id="voltage-values">
-                        {[1.2, 2.7, 3.7, 4.2, 5, 6, 7.4, 8.4, 9, 12, 16.8, 24, 28, 30].map((voltage) => (
-                          <option key={voltage} value={voltage} />
+                      >
+                        {RATED_VOLTAGES.map((voltage) => (
+                          <option key={voltage} value={voltage}>{voltage.toFixed(1)}V</option>
                         ))}
-                      </datalist>
+                      </select>
                     </label>
                   </div>
                   <div className="field-stack">
@@ -650,7 +648,7 @@ export default function Home() {
                   <p className="product-subtitle">{top.product.category} · {top.product.size || "尺寸待复核"}</p>
                   <div className="metric-grid">
                     <Metric label="堵转扭矩" value={`${formatTorque(top.product.torque)} kgf·cm`} />
-                    <Metric label="工作电压" value={`${top.product.voltageMin}–${top.product.voltageMax}V`} />
+                    <Metric label="电压范围" value={`${top.product.voltageMin}–${top.product.voltageMax}V`} />
                     <Metric label="空载速度" value={top.product.speed || "目录未标注"} />
                     <Metric label="操作角度" value={top.product.angle || "目录未标注"} />
                     <Metric label="控制 / 通讯" value={top.product.control || "目录未标注"} />