initial commit

src/App.tsx

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+import React, { useMemo, useRef, useState } from "react";
+
+// --- Helpers ---------------------------------------------------------------
+const currency = (n: number) =>
+  (isFinite(n) ? n : 0).toLocaleString(undefined, {
+    style: "currency",
+    currency: "USD",
+    maximumFractionDigits: 0,
+  });
+
+const clamp = (v: number, min: number, max: number) => Math.min(max, Math.max(min, v));
+
+// Map 1..5 to human-friendly week labels
+const weekLabel = (w: number) =>
+  ({ 1: "1st", 2: "2nd", 3: "3rd", 4: "4th", 5: "5th" } as Record<number, string>)[w] ?? `${w}th`;
+
+const months = [
+  "January",
+  "February",
+  "March",
+  "April",
+  "May",
+  "June",
+  "July",
+  "August",
+  "September",
+  "October",
+  "November",
+  "December",
+];
+
+// Approximate how many weeks between (month, week) pairs (inclusive)
+function approxWeeksBetween(
+  startMonthIdx: number,
+  startWeek: number,
+  endMonthIdx: number,
+  endWeek: number
+) {
+  const weeksPerMonth = 4.34524; // avg weeks per month
+  const start = startMonthIdx + (startWeek - 1) / 5;
+  const end = endMonthIdx + (endWeek - 1) / 5;
+  const monthsBetween = Math.max(0, end - start);
+  return Math.max(0, Math.round(monthsBetween * weeksPerMonth + 1));
+}
+
+// File download helper
+function downloadText(filename: string, text: string) {
+  const blob = new Blob([text], { type: "application/json" });
+  const url = URL.createObjectURL(blob);
+  const a = document.createElement("a");
+  a.href = url;
+  a.download = filename;
+  a.click();
+  URL.revokeObjectURL(url);
+}
+
+// Generic labeled number+slider input pair
+function NumberSlider({
+  label,
+  value,
+  onChange,
+  min = 0,
+  max = 100,
+  step = 1,
+  help,
+  id,
+}: {
+  label: string;
+  value: number;
+  onChange: (v: number) => void;
+  min?: number;
+  max?: number;
+  step?: number;
+  help?: string;
+  id?: string;
+}) {
+  const sliderId = id ?? label.replace(/\s+/g, "-").toLowerCase();
+  return (
+    <div className="space-y-2">
+      <div className="flex items-baseline justify-between">
+        <label htmlFor={sliderId} className="text-sm font-medium text-gray-800">
+          {label}
+        </label>
+        <input
+          type="number"
+          inputMode="decimal"
+          className="w-36 rounded-xl border border-gray-300 px-3 py-1 text-right shadow-sm focus:border-blue-500 focus:outline-none"
+          value={Number.isFinite(value) ? value : 0}
+          min={min}
+          max={max}
+          step={step}
+          onChange={(e) => onChange(clamp(parseFloat(e.target.value || "0"), min, max))}
+        />
+      </div>
+      <input
+        id={sliderId}
+        type="range"
+        min={min}
+        max={max}
+        step={step}
+        className="w-full accent-blue-600"
+        value={Number.isFinite(value) ? value : 0}
+        onChange={(e) => onChange(clamp(parseFloat(e.target.value || "0"), min, max))}
+      />
+      {help && <p className="text-xs text-gray-500">{help}</p>}
+    </div>
+  );
+}
+
+// --- Main App --------------------------------------------------------------
+export default function BaseballLeagueCostEstimator() {
+  // Fixed costs: name + amount
+  const [fixedCosts, setFixedCosts] = useState<Array<{ id: string; name: string; amount: number }>>([
+    { id: crypto.randomUUID(), name: "Insurance", amount: 1500 },
+    { id: crypto.randomUUID(), name: "Commissioner", amount: 2000 },
+  ]);
+
+  // Variables
+  const [teams, setTeams] = useState(12);
+  const [gamesPerTeam, setGamesPerTeam] = useState(10); // number of games per team
+  const [umpiresPerGame, setUmpiresPerGame] = useState(2);
+  const [costPerUmpPerGame, setCostPerUmpPerGame] = useState(70);
+  const [avgTeamSize, setAvgTeamSize] = useState(12);
+
+  // Per-game consumables
+  const [ballsPerGame, setBallsPerGame] = useState(4);
+  const [costPerDozenBalls, setCostPerDozenBalls] = useState(60);
+
+  // Season window
+  const [startMonth, setStartMonth] = useState(4); // 0-indexed; May
+  const [startWeek, setStartWeek] = useState(1);
+  const [endMonth, setEndMonth] = useState(7); // August
+  const [endWeek, setEndWeek] = useState(4);
+
+  // Fields table rows: name, pct of games, cost per game (optional)
+  const [fields, setFields] = useState<Array<{ id: string; name: string; pct: number; costPerGame: number }>>([
+    { id: crypto.randomUUID(), name: "Main Park #1", pct: 60, costPerGame: 40 },
+    { id: crypto.randomUUID(), name: "Riverside #2", pct: 40, costPerGame: 25 },
+  ]);
+
+  // Derived calculations
+  const fixedCostTotal = useMemo(
+    () => fixedCosts.reduce((sum, fc) => sum + (Number(fc.amount) || 0), 0),
+    [fixedCosts]
+  );
+
+  // Total league games, given each game involves exactly two teams
+  const totalGames = useMemo(() => (teams || 0) * (gamesPerTeam || 0) / 2, [teams, gamesPerTeam]);
+
+  // Scheduling references (games-per-opponent distribution)
+  const opponentsPerTeam = useMemo(() => Math.max(0, (teams || 0) - 1), [teams]);
+  const gamesPerOpponentExact = useMemo(() => {
+    if (!opponentsPerTeam) return 0;
+    return (gamesPerTeam || 0) / opponentsPerTeam;
+  }, [gamesPerTeam, opponentsPerTeam]);
+  const gamesPerOpponentFloor = useMemo(() => Math.floor(gamesPerOpponentExact), [gamesPerOpponentExact]);
+  const remainderOpponents = useMemo(() => {
+    if (!opponentsPerTeam) return 0;
+    return (gamesPerTeam || 0) % opponentsPerTeam;
+  }, [gamesPerTeam, opponentsPerTeam]);
+
+  const gamesVsEachOther = useMemo(() => {
+    if (!teams || teams < 2) return 0;
+    return (gamesPerTeam || 0) / (teams - 1);
+  }, [teams, gamesPerTeam]);
+
+  const umpireCostTotal = useMemo(
+    () => (totalGames || 0) * (umpiresPerGame || 0) * (costPerUmpPerGame || 0),
+    [totalGames, umpiresPerGame, costPerUmpPerGame]
+  );
+
+  const fieldsPctSum = useMemo(() => fields.reduce((s, f) => s + (Number(f.pct) || 0), 0), [fields]);
+
+  const fieldRentalCostTotal = useMemo(() => {
+    const totalPct = fieldsPctSum || 100;
+    const normalized = fields.map((f) => ({ ...f, w: (Number(f.pct) || 0) / totalPct }));
+    return normalized.reduce(
+      (sum, f) => sum + (totalGames || 0) * f.w * (Number(f.costPerGame) || 0),
+      0
+    );
+  }, [fields, fieldsPctSum, totalGames]);
+
+  // Per-game baseballs cost
+  const perBallCost = useMemo(() => (Number(costPerDozenBalls) || 0) / 12, [costPerDozenBalls]);
+  const baseballsCostPerGame = useMemo(() => (Number(ballsPerGame) || 0) * perBallCost, [ballsPerGame, perBallCost]);
+  const baseballsCostTotal = useMemo(() => (totalGames || 0) * baseballsCostPerGame, [totalGames, baseballsCostPerGame]);
+
+  // Split costs: league (fixed + fields + consumables) vs umpires
+  const leagueCostsTotal = useMemo(
+    () => fixedCostTotal + fieldRentalCostTotal + baseballsCostTotal,
+    [fixedCostTotal, fieldRentalCostTotal, baseballsCostTotal]
+  );
+
+  const grandTotal = leagueCostsTotal + umpireCostTotal;
+
+  const costPerTeam = useMemo(() => (teams > 0 ? grandTotal / teams : 0), [grandTotal, teams]);
+  const costPerTeamLeague = useMemo(() => (teams > 0 ? leagueCostsTotal / teams : 0), [leagueCostsTotal, teams]);
+  const costPerTeamUmpires = useMemo(() => (teams > 0 ? umpireCostTotal / teams : 0), [umpireCostTotal, teams]);
+
+  const costPerPlayer = useMemo(
+    () => (teams > 0 && avgTeamSize > 0 ? grandTotal / (teams * avgTeamSize) : 0),
+    [grandTotal, teams, avgTeamSize]
+  );
+
+  const approxWeeks = useMemo(
+    () => approxWeeksBetween(startMonth, startWeek, endMonth, endWeek),
+    [startMonth, startWeek, endMonth, endWeek]
+  );
+
+  const gamesPerWeekPerTeam = useMemo(() => {
+    if (!approxWeeks) return 0;
+    return (gamesPerTeam || 0) / approxWeeks;
+  }, [gamesPerTeam, approxWeeks]);
+
+  const gamesPerWeekLeague = useMemo(() => {
+    if (!approxWeeks) return 0;
+    return (totalGames || 0) / approxWeeks;
+  }, [totalGames, approxWeeks]);
+
+  // Mutators
+  const addFixed = () => setFixedCosts((x) => [...x, { id: crypto.randomUUID(), name: "New Fixed Cost", amount: 0 }]);
+  const removeFixed = (id: string) => setFixedCosts((x) => x.filter((r) => r.id !== id));
+
+  const addField = () =>
+    setFields((x) => [
+      ...x,
+      { id: crypto.randomUUID(), name: `Field ${x.length + 1}`, pct: 0, costPerGame: 0 },
+    ]);
+  const removeField = (id: string) => setFields((x) => x.filter((r) => r.id !== id));
+
+  const pctWarning = fieldsPctSum !== 100;
+
+  // --- Import/Export -------------------------------------------------------
+  type SaveShape = {
+    version: 1;
+    data: {
+      fixedCosts: Array<{ name: string; amount: number }>;
+      teams: number;
+      gamesPerTeam: number;
+      umpiresPerGame: number;
+      costPerUmpPerGame: number;
+      avgTeamSize: number;
+      ballsPerGame: number;
+      costPerDozenBalls: number;
+      startMonth: number; startWeek: number; endMonth: number; endWeek: number;
+      fields: Array<{ name: string; pct: number; costPerGame: number }>;
+    };
+  };
+
+  const fileInputRef = useRef<HTMLInputElement>(null);
+
+  const exportJSON = () => {
+    const payload: SaveShape = {
+      version: 1,
+      data: {
+        fixedCosts: fixedCosts.map(({ name, amount }) => ({ name, amount })),
+        teams,
+        gamesPerTeam,
+        umpiresPerGame,
+        costPerUmpPerGame,
+        avgTeamSize,
+        ballsPerGame,
+        costPerDozenBalls,
+        startMonth,
+        startWeek,
+        endMonth,
+        endWeek,
+        fields: fields.map(({ name, pct, costPerGame }) => ({ name, pct, costPerGame })),
+      },
+    };
+    const ts = new Date();
+    const pad = (n: number) => String(n).padStart(2, "0");
+    const fname = `league-cost-estimator-${ts.getFullYear()}${pad(ts.getMonth()+1)}${pad(ts.getDate())}-${pad(ts.getHours())}${pad(ts.getMinutes())}.json`;
+    downloadText(fname, JSON.stringify(payload, null, 2));
+  };
+
+  const applyImported = (s: SaveShape["data"]) => {
+    setFixedCosts((s.fixedCosts || []).map(fc => ({ id: crypto.randomUUID(), ...fc })));
+    setTeams(s.teams ?? teams);
+    setGamesPerTeam(s.gamesPerTeam ?? gamesPerTeam);
+    setUmpiresPerGame(s.umpiresPerGame ?? umpiresPerGame);
+    setCostPerUmpPerGame(s.costPerUmpPerGame ?? costPerUmpPerGame);
+    setAvgTeamSize(s.avgTeamSize ?? avgTeamSize);
+    setBallsPerGame(s.ballsPerGame ?? ballsPerGame);
+    setCostPerDozenBalls(s.costPerDozenBalls ?? costPerDozenBalls);
+    setStartMonth(s.startMonth ?? startMonth);
+    setStartWeek(s.startWeek ?? startWeek);
+    setEndMonth(s.endMonth ?? endMonth);
+    setEndWeek(s.endWeek ?? endWeek);
+    setFields((s.fields || []).map(f => ({ id: crypto.randomUUID(), ...f })));
+  };
+
+  const importFromFile = async (file: File) => {
+    try {
+      const text = await file.text();
+      const parsed = JSON.parse(text);
+      if (!parsed || parsed.version !== 1 || !parsed.data) throw new Error("Invalid or unsupported file format.");
+      applyImported(parsed.data);
+      alert("Import successful ✅");
+    } catch (err: any) {
+      console.error(err);
+      alert("Import failed: " + (err?.message || String(err)));
+    } finally {
+      if (fileInputRef.current) fileInputRef.current.value = "";
+    }
+  };
+
+  const onClickImport = () => fileInputRef.current?.click();
+
+  return (
+    <div className="mx-auto max-w-6xl p-6">
+      <header className="mb-6 flex items-center justify-between">
+        <h1 className="text-2xl font-bold">Baseball League Cost Estimator</h1>
+        <div className="flex items-center gap-2">
+          <input
+            ref={fileInputRef}
+            type="file"
+            accept="application/json"
+            className="hidden"
+            onChange={(e) => {
+              const f = e.target.files?.[0];
+              if (f) importFromFile(f);
+            }}
+          />
+          <button onClick={onClickImport} className="rounded-xl border border-gray-300 bg-white px-3 py-1.5 text-sm shadow hover:bg-gray-50">Import</button>
+          <button onClick={exportJSON} className="rounded-xl bg-blue-600 px-3 py-1.5 text-sm font-medium text-white shadow hover:bg-blue-700">Export</button>
+        </div>
+      </header>
+
+      <div className="grid grid-cols-1 gap-6 lg:grid-cols-3">
+        {/* Left column: Variables */}
+        <section className="lg:col-span-2 space-y-6">
+          {/* League Basics */}
+          <div className="rounded-2xl border border-gray-200 bg-white p-5 shadow-sm">
+            <h2 className="mb-4 text-lg font-semibold">League Basics</h2>
+            <div className="grid grid-cols-1 gap-6 sm:grid-cols-2">
+              <NumberSlider
+                label="Number of teams"
+                value={teams}
+                onChange={setTeams}
+                min={0}
+                max={50}
+              />
+
+              <NumberSlider
+                label="Games per team"
+                value={gamesPerTeam}
+                onChange={setGamesPerTeam}
+                min={0}
+                max={100}
+                step={1}
+                help={`League total games: ${totalGames}`}
+              />
+
+              <NumberSlider
+                label="Umpires per game"
+                value={umpiresPerGame}
+                onChange={setUmpiresPerGame}
+                min={0}
+                max={6}
+                step={1}
+              />
+
+              <NumberSlider
+                label="Cost per umpire per game ($)"
+                value={costPerUmpPerGame}
+                onChange={setCostPerUmpPerGame}
+                min={0}
+                max={300}
+                step={1}
+              />
+
+              <NumberSlider
+                label="Average team size (players)"
+                value={avgTeamSize}
+                onChange={setAvgTeamSize}
+                min={1}
+                max={30}
+                step={1}
+                help="Used for per-player cost"
+              />
+
+              <NumberSlider
+                label="Baseballs used per game"
+                value={ballsPerGame}
+                onChange={setBallsPerGame}
+                min={0}
+                max={24}
+                step={1}
+              />
+
+              <NumberSlider
+                label="Cost of baseballs per dozen ($)"
+                value={costPerDozenBalls}
+                onChange={setCostPerDozenBalls}
+                min={0}
+                max={200}
+                step={1}
+                help={`≈ ${currency(perBallCost)} per ball • ${currency(baseballsCostPerGame)} per game`}
+              />
+            </div>
+
+            {/* Scheduling reference */}
+            <div className="mt-4 rounded-xl border border-gray-100 bg-gray-50 p-3 text-sm">
+              <div className="flex flex-wrap gap-x-6 gap-y-1">
+                <div>Opponents per team: <span className="font-medium">{opponentsPerTeam}</span></div>
+                <div>Games per opponent (avg): <span className="font-medium">{gamesPerOpponentExact.toFixed(2)}</span></div>
+              </div>
+              {opponentsPerTeam > 0 && (
+                <div className="mt-1 text-gray-700">
+                  Distribution (as even as possible): each team plays <span className="font-medium">{remainderOpponents}</span> opponents <span className="font-medium">{gamesPerOpponentFloor + 1}×</span> and <span className="font-medium">{opponentsPerTeam - remainderOpponents}</span> opponents <span className="font-medium">{gamesPerOpponentFloor}×</span>.
+                </div>
+              )}
+              <div className="mt-1 text-gray-500">Total league games computed as teams × gamesPerTeam ÷ 2.</div>
+            </div>
+          </div>
+
+          {/* Season Window */}
+          <div className="rounded-2xl border border-gray-200 bg-white p-5 shadow-sm">
+            <h2 className="mb-4 text-lg font-semibold">Season Window</h2>
+            <div className="grid grid-cols-1 items-end gap-4 sm:grid-cols-4">
+              <div className="space-y-2">
+                <label className="text-sm font-medium text-gray-800">Start month</label>
+                <select
+                  className="w-full rounded-xl border border-gray-300 px-3 py-2 shadow-sm focus:border-blue-500 focus:outline-none"
+                  value={startMonth}
+                  onChange={(e) => setStartMonth(parseInt(e.target.value))}
+                >
+                  {months.map((m, i) => (
+                    <option key={m} value={i}>
+                      {m}
+                    </option>
+                  ))}
+                </select>
+              </div>
+              <div className="space-y-2">
+                <label className="text-sm font-medium text-gray-800">Start week</label>
+                <select
+                  className="w-full rounded-xl border border-gray-300 px-3 py-2 shadow-sm focus:border-blue-500 focus:outline-none"
+                  value={startWeek}
+                  onChange={(e) => setStartWeek(parseInt(e.target.value))}
+                >
+                  {[1, 2, 3, 4, 5].map((w) => (
+                    <option key={w} value={w}>
+                      {weekLabel(w)}
+                    </option>
+                  ))}
+                </select>
+              </div>
+
+              <div className="space-y-2">
+                <label className="text-sm font-medium text-gray-800">End month</label>
+                <select
+                  className="w-full rounded-xl border border-gray-300 px-3 py-2 shadow-sm focus:border-blue-500 focus:outline-none"
+                  value={endMonth}
+                  onChange={(e) => setEndMonth(parseInt(e.target.value))}
+                >
+                  {months.map((m, i) => (
+                    <option key={m} value={i}>
+                      {m}
+                    </option>
+                  ))}
+                </select>
+              </div>
+              <div className="space-y-2">
+                <label className="text-sm font-medium text-gray-800">End week</label>
+                <select
+                  className="w-full rounded-xl border border-gray-300 px-3 py-2 shadow-sm focus:border-blue-500 focus:outline-none"
+                  value={endWeek}
+                  onChange={(e) => setEndWeek(parseInt(e.target.value))}
+                >
+                  {[1, 2, 3, 4, 5].map((w) => (
+                    <option key={w} value={w}>
+                      {weekLabel(w)}
+                    </option>
+                  ))}
+                </select>
+              </div>
+            </div>
+            <div className="mt-3 grid grid-cols-1 gap-2 text-sm text-gray-700 sm:grid-cols-2 lg:grid-cols-4">
+              <div><span className="text-gray-600">Approx. season length:</span> <span className="font-medium">{approxWeeks} weeks</span></div>
+              <div><span className="text-gray-600">Games/week per team:</span> <span className="font-medium">{gamesPerWeekPerTeam.toFixed(2)}</span></div>
+              <div><span className="text-gray-600">Games/week league-wide:</span> <span className="font-medium">{gamesPerWeekLeague.toFixed(2)}</span></div>
+              <div><span className="text-gray-600">Games vs each opponent/team:</span> <span className="font-medium">{gamesVsEachOther.toFixed(2)}</span></div>
+            </div>
+          </div>
+
+          {/* Fields Table */}
+          <div className="rounded-2xl border border-gray-200 bg-white p-5 shadow-sm">
+            <div className="mb-4 flex items-center justify-between">
+              <h2 className="text-lg font-semibold">Fields & Game Allocation</h2>
+              <button
+                onClick={addField}
+                className="rounded-xl bg-blue-600 px-3 py-1.5 text-sm font-medium text-white shadow hover:bg-blue-700"
+              >
+                + Add field
+              </button>
+            </div>
+            <div className="overflow-x-auto">
+              <table className="w-full table-auto">
+                <thead>
+                  <tr className="text-left text-sm text-gray-500">
+                    <th className="p-2">Field name</th>
+                    <th className="p-2">% of games</th>
+                    <th className="p-2">Cost per game ($)</th>
+                    <th className="p-2"></th>
+                  </tr>
+                </thead>
+                <tbody>
+                  {fields.map((f) => (
+                    <tr key={f.id} className="border-t border-gray-100">
+                      <td className="p-2">
+                        <input
+                          className="w-full rounded-lg border border-gray-300 px-3 py-2 text-sm focus:border-blue-500 focus:outline-none"
+                          value={f.name}
+                          onChange={(e) =>
+                            setFields((rows) => rows.map((r) => (r.id === f.id ? { ...r, name: e.target.value } : r)))
+                          }
+                        />
+                      </td>
+                      <td className="p-2">
+                        <input
+                          type="number"
+                          className="w-28 rounded-lg border border-gray-300 px-3 py-2 text-right text-sm focus:border-blue-500 focus:outline-none"
+                          min={0}
+                          max={100}
+                          step={1}
+                          value={f.pct}
+                          onChange={(e) =>
+                            setFields((rows) =>
+                              rows.map((r) => (r.id === f.id ? { ...r, pct: clamp(parseFloat(e.target.value || "0"), 0, 100) } : r))
+                            )
+                          }
+                        />
+                      </td>
+                      <td className="p-2">
+                        <input
+                          type="number"
+                          className="w-40 rounded-lg border border-gray-300 px-3 py-2 text-right text-sm focus:border-blue-500 focus:outline-none"
+                          min={0}
+                          step={1}
+                          value={f.costPerGame}
+                          onChange={(e) =>
+                            setFields((rows) =>
+                              rows.map((r) =>
+                                r.id === f.id
+                                  ? { ...r, costPerGame: clamp(parseFloat(e.target.value || "0"), 0, 10000) }
+                                  : r
+                              )
+                            )
+                          }
+                        />
+                      </td>
+                      <td className="p-2 text-right">
+                        <button
+                          onClick={() => removeField(f.id)}
+                          className="text-sm text-red-600 hover:underline"
+                        >
+                          Remove
+                        </button>
+                      </td>
+                    </tr>
+                  ))}
+                </tbody>
+                <tfoot>
+                  <tr className="border-t border-gray-200 text-sm">
+                    <td className="p-2 font-medium text-gray-700">Totals</td>
+                    <td className="p-2 font-medium {pctWarning ? 'text-red-600' : 'text-gray-700'}">{fieldsPctSum}%</td>
+                    <td className="p-2 font-medium text-gray-700">—</td>
+                    <td></td>
+                  </tr>
+                </tfoot>
+              </table>
+            </div>
+            {pctWarning && (
+              <div className="mt-3 rounded-xl border border-yellow-300 bg-yellow-50 px-3 py-2 text-sm text-yellow-900">
+                Heads up: your field allocation adds to {fieldsPctSum}%. Calculations will normalize
+                percentages to 100%.
+              </div>
+            )}
+          </div>
+        </section>
+
+        {/* Right column: Fixed costs + Summary */}
+        <section className="space-y-6">
+          {/* Fixed costs */}
+          <div className="rounded-2xl border border-gray-200 bg-white p-5 shadow-sm">
+            <div className="mb-4 flex items-center justify-between">
+              <h2 className="text-lg font-semibold">Fixed Costs</h2>
+              <button
+                onClick={addFixed}
+                className="rounded-xl bg-blue-600 px-3 py-1.5 text-sm font-medium text-white shadow hover:bg-blue-700"
+              >
+                + Add item
+              </button>
+            </div>
+            <div className="space-y-3">
+              {fixedCosts.map((fc) => (
+                <div key={fc.id} className="grid grid-cols-5 items-center gap-2">
+                  <input
+                    className="col-span-3 rounded-lg border border-gray-300 px-3 py-2 text-sm focus:border-blue-500 focus:outline-none"
+                    value={fc.name}
+                    onChange={(e) =>
+                      setFixedCosts((rows) => rows.map((r) => (r.id === fc.id ? { ...r, name: e.target.value } : r)))
+                    }
+                  />
+                  <input
+                    type="number"
+                    className="col-span-2 rounded-lg border border-gray-300 px-3 py-2 text-right text-sm focus:border-blue-500 focus:outline-none"
+                    min={0}
+                    step={1}
+                    value={fc.amount}
+                    onChange={(e) =>
+                      setFixedCosts((rows) =>
+                        rows.map((r) =>
+                          r.id === fc.id
+                            ? { ...r, amount: clamp(parseFloat(e.target.value || "0"), 0, 1_000_000) }
+                            : r
+                        )
+                      )
+                    }
+                  />
+                  <div className="col-span-5 flex justify-end">
+                    <button
+                      onClick={() => removeFixed(fc.id)}
+                      className="text-sm text-red-600 hover:underline"
+                    >
+                      Remove
+                    </button>
+                  </div>
+                </div>
+              ))}
+            </div>
+            <div className="mt-4 flex items-center justify-between border-t pt-3 text-sm">
+              <div className="font-medium text-gray-700">Fixed cost total</div>
+              <div className="font-semibold">{currency(fixedCostTotal)}</div>
+            </div>
+          </div>
+
+          {/* Summary */}
+          <div className="rounded-2xl border border-gray-200 bg-white p-5 shadow-sm">
+            <h2 className="mb-4 text-lg font-semibold">Summary</h2>
+            <div className="space-y-2 text-sm">
+              <div className="flex justify-between"><span>Umpire costs</span><span className="font-medium">{currency(umpireCostTotal)}</span></div>
+              <div className="flex justify-between"><span>Field rental costs</span><span className="font-medium">{currency(fieldRentalCostTotal)}</span></div>
+              <div className="flex justify-between"><span>Baseballs (per-game consumables)</span><span className="font-medium">{currency(baseballsCostTotal)}</span></div>
+              <div className="flex justify-between"><span>Fixed costs</span><span className="font-medium">{currency(fixedCostTotal)}</span></div>
+              <div className="flex justify-between border-t pt-2">
+                <span>League costs subtotal</span>
+                <span className="font-medium">{currency(leagueCostsTotal)}</span>
+              </div>
+              <div className="flex justify-between border-t pt-2 text-base">
+                <span className="font-semibold">Grand total</span>
+                <span className="font-bold">{currency(grandTotal)}</span>
+              </div>
+            </div>
+            <div className="mt-4 space-y-2 rounded-xl bg-gray-50 p-3 text-sm">
+              <div className="flex justify-between"><span>Per team to league</span><span className="font-semibold">{currency(costPerTeamLeague)}</span></div>
+              <div className="flex justify-between"><span>Per team to umpires</span><span className="font-semibold">{currency(costPerTeamUmpires)}</span></div>
+              <div className="flex justify-between"><span>Per team (total)</span><span className="font-semibold">{currency(costPerTeam)}</span></div>
+              <div className="flex justify-between"><span>Per player (avg team size {avgTeamSize})</span><span className="font-semibold">{currency(costPerPlayer)}</span></div>
+            </div>
+
+            <div className="mt-4 text-xs text-gray-500">
+              Notes:
+              <ul className="list-disc pl-5">
+                <li>League total games = teams × games per team ÷ 2.</li>
+                <li>Field cost = total games × % allocation × per-field cost per game.</li>
+                <li>Percentages are normalized if they don't add up to 100%.</li>
+                <li>Season window drives weekly rates only; it doesn't alter totals.</li>
+              </ul>
+            </div>
+          </div>
+        </section>
+      </div>
+
+      <footer className="mt-8 text-center text-xs text-gray-500">
+        Built for quick budgeting. Adjust anything and the math updates instantly.
+      </footer>
+    </div>
+  );
+}