"use client";

import { FormEvent, useMemo, useState } from "react";
import {
  CATALOG_COUNTS,
  CATALOG_PRODUCTS,
  type CatalogProduct,
} from "./catalog-data";

type Gear = "塑料齿" | "半金属齿" | "金属齿";

type Product = {
  id: string;
  name: string;
  subtitle: string;
  weight: number;
  torque: number;
  speed: number;
  voltageMin: number;
  voltageMax: number;
  gear: Gear;
  price: number;
  size: string;
  image: string;
  applications: string[];
  code: string;
};

type Requirements = {
  application: string;
  torque: number;
  voltage: number;
  weightLimit: number;
  gear: "不限" | Gear;
  annualVolume: string;
  currentModel: string;
  painPoint: string;
};

const PRODUCTS: Product[] = [
  {
    id: "17g",
    name: "1.7克超微型舵机",
    subtitle: "极致轻量，适合微型结构",
    weight: 1.7,
    torque: 0.09,
    speed: 0.12,
    voltageMin: 2.7,
    voltageMax: 5,
    gear: "塑料齿",
    price: 30,
    size: "13.40 × 6.15 × 16.00 mm",
    image: "/products/servo-17g.png",
    applications: ["AI毛绒", "智能玩具", "微型机器人", "云台/航模"],
    code: "4.A.01.A0060",
  },
  {
    id: "2g",
    name: "2克塑料齿舵机",
    subtitle: "快速响应的微型执行方案",
    weight: 2,
    torque: 0.4,
    speed: 0.08,
    voltageMin: 3.5,
    voltageMax: 6,
    gear: "塑料齿",
    price: 14.4,
    size: "16.25 × 8.30 × 16.90 mm",
    image: "/products/servo-2g.jpg",
    applications: ["AI毛绒", "智能玩具", "微型机器人", "云台/航模"],
    code: "4.A.01.A0004",
  },
  {
    id: "37g",
    name: "3.7克塑料齿舵机",
    subtitle: "轻量玩具与科创教育通用",
    weight: 3.7,
    torque: 0.8,
    speed: 0.09,
    voltageMin: 3.5,
    voltageMax: 6,
    gear: "塑料齿",
    price: 14.7,
    size: "20.40 × 8.70 × 20.32 mm",
    image: "/products/servo-37g.jpg",
    applications: ["AI毛绒", "智能玩具", "教育/积木", "云台/航模"],
    code: "4.A.01.A0003",
  },
  {
    id: "9p",
    name: "9克塑料齿舵机",
    subtitle: "成本优先的标准轻载方案",
    weight: 9,
    torque: 2.1,
    speed: 0.11,
    voltageMin: 4.8,
    voltageMax: 6,
    gear: "塑料齿",
    price: 13.1,
    size: "23.00 × 12.36 × 28.50 mm",
    image: "/products/servo-9g-plastic.jpg",
    applications: ["智能玩具", "教育/积木", "微型机器人", "云台/航模"],
    code: "4.A.01.A0009",
  },
  {
    id: "9h",
    name: "9克半金属齿舵机",
    subtitle: "耐久与成本兼顾",
    weight: 9,
    torque: 3.2,
    speed: 0.13,
    voltageMin: 4.8,
    voltageMax: 6,
    gear: "半金属齿",
    price: 18,
    size: "23.00 × 12.36 × 28.50 mm",
    image: "/products/servo-9g-hybrid.jpg",
    applications: ["智能玩具", "教育/积木", "微型机器人", "云台/航模"],
    code: "4.A.01.B0001",
  },
  {
    id: "9m",
    name: "9克全金属齿舵机",
    subtitle: "高频使用与冲击负载优选",
    weight: 9,
    torque: 3.2,
    speed: 0.13,
    voltageMin: 4.8,
    voltageMax: 6,
    gear: "金属齿",
    price: 28.7,
    size: "23.00 × 12.36 × 28.50 mm",
    image: "/products/servo-9g-metal.jpg",
    applications: ["教育/积木", "微型机器人", "云台/航模", "工业设备"],
    code: "4.A.01.B0026",
  },
  {
    id: "17p",
    name: "17克塑料齿舵机",
    subtitle: "玩具机构的高性价比选择",
    weight: 17,
    torque: 5,
    speed: 0.1,
    voltageMin: 4.8,
    voltageMax: 6,
    gear: "塑料齿",
    price: 14.9,
    size: "28.60 × 13.00 × 31.00 mm",
    image: "/products/servo-17g-plastic.jpg",
    applications: ["智能玩具", "教育/积木", "微型机器人"],
    code: "4.A.01.A0002",
  },
  {
    id: "17m",
    name: "17克金属齿舵机",
    subtitle: "宽电压、高扭矩、耐冲击",
    weight: 17,
    torque: 8.8,
    speed: 0.18,
    voltageMin: 4.8,
    voltageMax: 8.4,
    gear: "金属齿",
    price: 27.8,
    size: "28.60 × 13.00 × 31.00 mm",
    image: "/products/servo-17g-metal.jpg",
    applications: ["智能玩具", "微型机器人", "云台/航模", "工业设备"],
    code: "4.A.01.B0007",
  },
  {
    id: "25p",
    name: "25克塑料齿舵机",
    subtitle: "中等负载的经济型方案",
    weight: 25,
    torque: 7.5,
    speed: 0.15,
    voltageMin: 4.8,
    voltageMax: 6,
    gear: "塑料齿",
    price: 16.4,
    size: "36.00 × 15.20 × 29.50 mm",
    image: "/products/servo-25g-plastic.jpg",
    applications: ["智能玩具", "教育/积木", "微型机器人"],
    code: "4.A.01.A0001",
  },
  {
    id: "25m",
    name: "25克金属齿舵机",
    subtitle: "中型机器人和高频机构",
    weight: 25,
    torque: 8.2,
    speed: 0.15,
    voltageMin: 4.8,
    voltageMax: 8.4,
    gear: "金属齿",
    price: 44.7,
    size: "36.00 × 15.20 × 29.50 mm",
    image: "/products/servo-25g-metal.jpg",
    applications: ["微型机器人", "云台/航模", "工业设备"],
    code: "4.A.01.B0014",
  },
  {
    id: "37p",
    name: "37克塑料齿舵机",
    subtitle: "标准尺寸、大负载经济型",
    weight: 37,
    torque: 6.8,
    speed: 0.22,
    voltageMin: 4.8,
    voltageMax: 6,
    gear: "塑料齿",
    price: 18.4,
    size: "40.85 × 20.15 × 39.15 mm",
    image: "/products/servo-37g-plastic.jpg",
    applications: ["智能玩具", "微型机器人", "工业设备"],
    code: "4.A.01.B0015",
  },
  {
    id: "37h",
    name: "37克半金属齿舵机",
    subtitle: "大扭矩与成本的平衡点",
    weight: 37,
    torque: 11.2,
    speed: 0.26,
    voltageMin: 4.8,
    voltageMax: 6,
    gear: "半金属齿",
    price: 32.9,
    size: "40.85 × 20.15 × 39.15 mm",
    image: "/products/servo-37g-hybrid.jpg",
    applications: ["微型机器人", "云台/航模", "工业设备"],
    code: "4.A.01.B0005",
  },
  {
    id: "37m",
    name: "37克金属齿舵机",
    subtitle: "24kgf·cm级强劲输出",
    weight: 37,
    torque: 24,
    speed: 0.22,
    voltageMin: 4.8,
    voltageMax: 8.4,
    gear: "金属齿",
    price: 37.6,
    size: "40.85 × 20.15 × 39.15 mm",
    image: "/products/servo-37g-metal.jpg",
    applications: ["机器人/机械臂", "云台/航模", "工业设备"],
    code: "4.A.01.B0017",
  },
];

const APPLICATIONS = [
  { name: "AI毛绒", note: "头部、耳朵、手臂等轻量动作" },
  { name: "智能玩具", note: "互动机构、表情和行走结构" },
  { name: "教育/积木", note: "STEAM套件与积木动力模块" },
  { name: "微型机器人", note: "关节、夹爪和小型机械臂" },
  { name: "云台/航模", note: "飞行控制、云台与模型机构" },
  { name: "工业设备", note: "控制机构与定制传动组件" },
];

const CATALOG_CATEGORIES = [
  "全部产品",
  "标准舵机",
  "异形舵机",
  "全金属舵机",
  "大扭矩舵机",
  "积木舵机",
  "标准齿轮箱",
  "翻盖电机",
];

const FEATURED_SPEC_ORDER = [
  "堵转扭矩",
  "额定电压",
  "电压范围",
  "信号类型",
  "通讯方式",
  "齿轮比",
  "寿命",
  "产品尺寸",
  "外形尺寸",
];

function getFeaturedSpecs(product: CatalogProduct) {
  return FEATURED_SPEC_ORDER
    .filter((label) => product.specs[label])
    .slice(0, 3)
    .map((label) => [label, product.specs[label]] as const);
}

const DEFAULT_REQUIREMENTS: Requirements = {
  application: "",
  torque: 2,
  voltage: 5,
  weightLimit: 40,
  gear: "不限",
  annualVolume: "5000–50000件",
  currentModel: "",
  painPoint: "交期",
};

function getMatches(requirements: Requirements) {
  return PRODUCTS.map((product) => {
    let score = 34;
    const reasons: string[] = [];

    if (product.applications.includes(requirements.application)) {
      score += 18;
      reasons.push(`适合${requirements.application}场景`);
    }

    if (product.torque >= requirements.torque) {
      score += 25;
      const margin = Math.round((product.torque / requirements.torque - 1) * 100);
      reasons.push(`扭矩满足，约有${Math.max(0, margin)}%余量`);
    } else {
      score -= 70;
    }

    if (
      requirements.voltage >= product.voltageMin &&
      requirements.voltage <= product.voltageMax
    ) {
      score += 14;
      reasons.push(`${requirements.voltage}V供电兼容`);
    } else {
      score -= 35;
    }

    if (product.weight <= requirements.weightLimit) {
      score += 10;
      reasons.push(`重量不超过${requirements.weightLimit}g`);
    } else {
      score -= 45;
    }

    if (requirements.gear === "不限" || requirements.gear === product.gear) {
      score += requirements.gear === "不限" ? 4 : 12;
      if (requirements.gear !== "不限") reasons.push(`${product.gear}符合偏好`);
    } else if (requirements.gear === "金属齿" && product.gear !== "金属齿") {
      score -= 22;
    }

    if (requirements.painPoint === "成本" && product.gear === "塑料齿") score += 8;
    if (requirements.painPoint === "耐久" && product.gear === "金属齿") score += 8;
    if (requirements.painPoint === "体积" && product.weight <= 9) score += 8;

    return {
      product,
      score,
      confidence: Math.max(52, Math.min(96, score)),
      reasons: reasons.slice(0, 3),
    };
  }).sort((a, b) => b.score - a.score);
}

function Metric({ label, value }: { label: string; value: string }) {
  return (
    <div className="metric">
      <span>{label}</span>
      <strong>{value}</strong>
    </div>
  );
}

export default function Home() {
  const [stage, setStage] = useState(0);
  const [requirements, setRequirements] = useState(DEFAULT_REQUIREMENTS);
  const [showSampleForm, setShowSampleForm] = useState(false);
  const [submitted, setSubmitted] = useState(false);
  const [leadId, setLeadId] = useState("");
  const [catalogQuery, setCatalogQuery] = useState("");
  const [catalogCategory, setCatalogCategory] = useState("全部产品");
  const [catalogLimit, setCatalogLimit] = useState(24);
  const [selectedCatalogProduct, setSelectedCatalogProduct] = useState<CatalogProduct | null>(null);

  const matches = useMemo(() => getMatches(requirements), [requirements]);
  const topMatches = matches.slice(0, 3);
  const top = topMatches[0];
  const filteredCatalog = useMemo(() => {
    const query = catalogQuery.trim().toLowerCase();
    return CATALOG_PRODUCTS.filter((product) => {
      const matchesCategory =
        catalogCategory === "全部产品" || product.category === catalogCategory;
      if (!matchesCategory) return false;
      if (!query) return true;
      const haystack = [
        product.name,
        product.code,
        product.category,
        ...Object.keys(product.specs),
        ...Object.values(product.specs),
      ]
        .join(" ")
        .toLowerCase();
      return haystack.includes(query);
    });
  }, [catalogCategory, catalogQuery]);
  const visibleCatalog = filteredCatalog.slice(0, catalogLimit);
  const needsEngineer =
    top.score < 60 ||
    requirements.annualVolume === "50000件以上" ||
    requirements.application === "工业设备";

  function update<K extends keyof Requirements>(key: K, value: Requirements[K]) {
    setRequirements((current) => ({ ...current, [key]: value }));
  }

  function reset() {
    setStage(1);
    setRequirements(DEFAULT_REQUIREMENTS);
    setShowSampleForm(false);
    setSubmitted(false);
  }

  function submitLead(event: FormEvent<HTMLFormElement>) {
    event.preventDefault();
    const id = `GDL-${new Date().toISOString().slice(5, 10).replace("-", "")}-${String(
      Date.now(),
    ).slice(-4)}`;
    setLeadId(id);
    setSubmitted(true);
  }

  return (
    <main>
      <header className="site-header">
        <a className="brand" href="#top" aria-label="高徳乐 AI选型首页">
          <span className="brand-mark">G</span>
          <span>
            <strong>GAUDELOT</strong>
            <small>高徳乐 · 精密传动</small>
          </span>
        </a>
        <nav aria-label="主导航">
          <a href="#selector">AI选型</a>
          <a href="#products">完整目录</a>
          <a href="#how">服务流程</a>
        </nav>
        <button className="header-cta" type="button" onClick={() => setStage(1)}>
          开始选型 <span>→</span>
        </button>
      </header>

      <section className="hero" id="top">
        <div className="hero-copy">
          <div className="eyebrow"><span /> AI 智能选型 · 工程师复核</div>
          <h1>
            3分钟，找到<br />
            <em>适合你的舵机</em>
          </h1>
          <p className="hero-lead">
            告诉我们应用、扭矩与结构限制。AI从高徳乐标准产品中生成候选方案，
            同步准备样品与替代选型摘要。
          </p>
          <div className="hero-actions">
            <button className="primary-action" type="button" onClick={() => setStage(1)}>
              免费开始选型 <span>→</span>
            </button>
            <a href="#products" className="text-action">查看能力范围</a>
          </div>
          <div className="trust-row">
            <span><b>280</b> 个产品型号</span>
            <span><b>0.09–920</b> kgf·cm</span>
            <span><b>48h</b> 方案响应</span>
          </div>
        </div>

        <div className="selector-shell" id="selector">
          <div className="selector-topbar">
            <div>
              <span className="live-dot" /> AI 选型助手
            </div>
            <span className="secure-note">仅作初选建议</span>
          </div>

          {stage === 0 && (
            <div className="welcome-panel">
              <div className="assistant-avatar">AI</div>
              <p className="assistant-label">高徳乐选型助手</p>
              <h2>你好，我来帮你缩小选型范围。</h2>
              <p>回答3组问题，即可获得推荐型号、匹配理由和样品申请入口。</p>
              <button className="panel-primary" type="button" onClick={() => setStage(1)}>
                开始回答 <span>预计3分钟</span>
              </button>
              <div className="privacy-note">✓ 无需注册即可查看选型结果</div>
            </div>
          )}

          {stage > 0 && stage < 4 && (
            <div className="question-panel">
              <div className="progress-wrap" aria-label={`选型进度 ${stage}/3`}>
                <div className="progress-labels">
                  <span>需求识别</span>
                  <strong>{stage} / 3</strong>
                </div>
                <div className="progress-track"><i style={{ width: `${stage * 33.33}%` }} /></div>
              </div>

              {stage === 1 && (
                <div className="question-step">
                  <p className="step-kicker">第一步 · 使用场景</p>
                  <h2>舵机将用在什么产品上？</h2>
                  <p className="step-help">选择最接近的一项，后续可以补充具体结构。</p>
                  <div className="choice-grid">
                    {APPLICATIONS.map((item) => (
                      <button
                        type="button"
                        key={item.name}
                        className={`choice-card ${requirements.application === item.name ? "selected" : ""}`}
                        onClick={() => update("application", item.name)}
                      >
                        <b>{item.name}</b>
                        <small>{item.note}</small>
                        <span className="choice-check">✓</span>
                      </button>
                    ))}
                  </div>
                </div>
              )}

              {stage === 2 && (
                <div className="question-step">
                  <p className="step-kicker">第二步 · 核心参数</p>
                  <h2>需要多大的输出能力？</h2>
                  <p className="step-help">不确定时可填写估算值，工程师会在送样前复核。</p>
                  <div className="field-stack">
                    <label className="field-label" htmlFor="torque">
                      最低堵转扭矩 <strong>{requirements.torque} kgf·cm</strong>
                    </label>
                    <input
                      id="torque"
                      className="range-input"
                      type="range"
                      min="0.1"
                      max="24"
                      step="0.1"
                      value={requirements.torque}
                      onChange={(event) => update("torque", Number(event.target.value))}
                    />
                    <div className="range-scale"><span>0.1</span><span>5</span><span>10</span><span>15</span><span>24</span></div>
                  </div>
                  <div className="two-fields">
                    <label className="select-field">
                      <span>系统工作电压</span>
                      <select
                        value={requirements.voltage}
                        onChange={(event) => update("voltage", Number(event.target.value))}
                      >
                        <option value={3.7}>3.7V</option>
                        <option value={4.2}>4.2V</option>
                        <option value={5}>5.0V</option>
                        <option value={6}>6.0V</option>
                        <option value={7.4}>7.4V</option>
                        <option value={8.4}>8.4V</option>
                      </select>
                    </label>
                    <label className="select-field">
                      <span>单只重量上限</span>
                      <select
                        value={requirements.weightLimit}
                        onChange={(event) => update("weightLimit", Number(event.target.value))}
                      >
                        <option value={2}>2g以内</option>
                        <option value={4}>4g以内</option>
                        <option value={10}>10g以内</option>
                        <option value={20}>20g以内</option>
                        <option value={40}>40g以内</option>
                      </select>
                    </label>
                  </div>
                </div>
              )}

              {stage === 3 && (
                <div className="question-step">
                  <p className="step-kicker">第三步 · 项目信息</p>
                  <h2>最后，告诉我采购侧的偏好。</h2>
                  <p className="step-help">这些信息用于计算推荐优先级，不会改变公开参考价。</p>
                  <div className="field-group">
                    <span className="field-title">齿轮偏好</span>
                    <div className="pill-row">
                      {(["不限", "塑料齿", "半金属齿", "金属齿"] as const).map((gear) => (
                        <button
                          type="button"
                          key={gear}
                          className={requirements.gear === gear ? "active" : ""}
                          onClick={() => update("gear", gear)}
                        >{gear}</button>
                      ))}
                    </div>
                  </div>
                  <div className="two-fields">
                    <label className="select-field">
                      <span>预计年度用量</span>
                      <select
                        value={requirements.annualVolume}
                        onChange={(event) => update("annualVolume", event.target.value)}
                      >
                        <option>500件以内</option>
                        <option>500–5000件</option>
                        <option>5000–50000件</option>
                        <option>50000件以上</option>
                      </select>
                    </label>
                    <label className="select-field">
                      <span>最想解决的问题</span>
                      <select
                        value={requirements.painPoint}
                        onChange={(event) => update("painPoint", event.target.value)}
                      >
                        <option>交期</option>
                        <option>成本</option>
                        <option>耐久</option>
                        <option>体积</option>
                        <option>一致性</option>
                        <option>二供替代</option>
                      </select>
                    </label>
                  </div>
                  <label className="text-field">
                    <span>当前使用型号（选填）</span>
                    <input
                      value={requirements.currentModel}
                      onChange={(event) => update("currentModel", event.target.value)}
                      placeholder="例如：SG90 / DS-E001 / 自定义型号"
                    />
                  </label>
                </div>
              )}

              <div className="panel-nav">
                <button className="back-button" type="button" onClick={() => setStage(stage - 1)}>← 返回</button>
                <button
                  className="next-button"
                  type="button"
                  disabled={stage === 1 && !requirements.application}
                  onClick={() => setStage(stage + 1)}
                >
                  {stage === 3 ? "生成选型方案" : "继续"} <span>→</span>
                </button>
              </div>
            </div>
          )}

          {stage === 4 && top && (
            <div className="result-panel">
              <div className="result-heading">
                <div>
                  <p className="step-kicker">AI 初选结果</p>
                  <h2>找到 {topMatches.length} 个候选方案</h2>
                </div>
                <button type="button" className="restart-button" onClick={reset}>重新选型</button>
              </div>

              <div className="best-match">
                <div className="match-image-wrap">
                  <img src={top.product.image} alt={top.product.name} />
                  <span className="match-badge">首选推荐</span>
                </div>
                <div className="match-content">
                  <div className="match-score"><span>匹配度</span><strong>{top.confidence}%</strong></div>
                  <p className="product-code">{top.product.code}</p>
                  <h3>{top.product.name}</h3>
                  <p className="product-subtitle">{top.product.subtitle}</p>
                  <div className="metric-grid">
                    <Metric label="堵转扭矩" value={`${top.product.torque} kgf·cm`} />
                    <Metric label="空载速度" value={`≤${top.product.speed}s/60°`} />
                    <Metric label="工作电压" value={`${top.product.voltageMin}–${top.product.voltageMax}V`} />
                    <Metric label="齿轮材质" value={top.product.gear} />
                  </div>
                  <ul className="reason-list">
                    {top.reasons.map((reason) => <li key={reason}>✓ {reason}</li>)}
                  </ul>
                  <div className="price-line">
                    <span>商城参考价</span>
                    <strong>¥{top.product.price.toFixed(1)}</strong>
                    <small>/ 只 · 批量价需确认</small>
                  </div>
                </div>
              </div>

              {needsEngineer && (
                <div className="engineer-alert">
                  <span>工程师复核</span>
                  <p>你的项目包含高用量、工业场景或边界参数，系统已标记为优先人工复核。</p>
                </div>
              )}

              <div className="alternative-list">
                {topMatches.slice(1).map((match) => (
                  <div className="alternative-card" key={match.product.id}>
                    <img src={match.product.image} alt={match.product.name} />
                    <div>
                      <span>{match.confidence}% 匹配</span>
                      <h4>{match.product.name}</h4>
                      <p>{match.product.torque} kgf·cm · {match.product.gear} · ¥{match.product.price.toFixed(1)}</p>
                    </div>
                  </div>
                ))}
              </div>

              {!showSampleForm && (
                <div className="result-actions">
                  <button className="panel-primary" type="button" onClick={() => setShowSampleForm(true)}>
                    申请样品与工程师复核 <span>→</span>
                  </button>
                  <button className="outline-button" type="button" onClick={() => window.print()}>打印 / 保存方案</button>
                </div>
              )}

              {showSampleForm && !submitted && (
                <form className="sample-form" onSubmit={submitLead}>
                  <div>
                    <p className="step-kicker">样品申请</p>
                    <h3>留下项目联系方式</h3>
                    <p>演示版会生成一张线索卡；正式版可接入CRM、企微或商城订单。</p>
                  </div>
                  <div className="form-grid">
                    <label><span>公司名称</span><input required name="company" placeholder="请输入公司名称" /></label>
                    <label><span>联系人</span><input required name="name" placeholder="姓名" /></label>
                    <label><span>手机号</span><input required name="phone" inputMode="tel" placeholder="用于样品确认" /></label>
                    <label><span>样品数量</span><select name="quantity"><option>1–2只</option><option>3–5只</option><option>6–10只</option></select></label>
                  </div>
                  <label className="full-field"><span>补充说明</span><textarea name="notes" placeholder="安装尺寸、线长、角度、控制协议或测试时间要求" /></label>
                  <button className="panel-primary" type="submit">生成样品申请单 <span>→</span></button>
                  <small className="demo-disclaimer">当前为内部演示，不会向外部系统发送信息。</small>
                </form>
              )}

              {submitted && (
                <div className="success-card">
                  <div className="success-icon">✓</div>
                  <p className="step-kicker">线索卡已生成</p>
                  <h3>申请编号 {leadId}</h3>
                  <p>推荐型号：{top.product.name}。正式版上线后，此处将自动进入CRM并触发技术复核。</p>
                  <button type="button" className="outline-button" onClick={reset}>继续测试另一组需求</button>
                </div>
              )}
            </div>
          )}
        </div>
      </section>

      <section className="capability-strip" aria-label="高徳乐能力">
        <div><strong>2万㎡</strong><span>研发与制造基地</span></div>
        <div><strong>137台</strong><span>精密注塑设备</span></div>
        <div><strong>1万台/天</strong><span>单线自动化产能</span></div>
        <div><strong>IATF 16949</strong><span>汽车行业质量体系</span></div>
      </section>

      <section className="products-section" id="products">
        <div className="section-heading">
          <div>
            <p className="eyebrow"><span /> 官方产品目录 · 2026.06</p>
            <h2>完整收录280个产品型号</h2>
          </div>
          <p>覆盖标准、异形、全金属、大扭矩和积木舵机，以及标准齿轮箱与翻盖电机。参数来自高徳乐官方产品型号表。</p>
        </div>

        <div className="catalog-summary" aria-label="产品分类统计">
          {CATALOG_CATEGORIES.slice(1).map((category) => (
            <button
              type="button"
              key={category}
              className={catalogCategory === category ? "active" : ""}
              onClick={() => {
                setCatalogCategory(category);
                setCatalogLimit(24);
              }}
            >
              <strong>{CATALOG_COUNTS[category]}</strong>
              <span>{category}</span>
            </button>
          ))}
        </div>

        <div className="catalog-toolbar">
          <label className="catalog-search">
            <span>⌕</span>
            <input
              value={catalogQuery}
              onChange={(event) => {
                setCatalogQuery(event.target.value);
                setCatalogLimit(24);
              }}
              placeholder="搜索型号、编码、扭矩、协议或参数"
              aria-label="搜索产品目录"
            />
            {catalogQuery && (
              <button type="button" onClick={() => setCatalogQuery("")} aria-label="清空搜索">×</button>
            )}
          </label>
          <div className="category-pills" aria-label="产品类别筛选">
            {CATALOG_CATEGORIES.map((category) => (
              <button
                type="button"
                key={category}
                className={catalogCategory === category ? "active" : ""}
                onClick={() => {
                  setCatalogCategory(category);
                  setCatalogLimit(24);
                }}
              >{category}</button>
            ))}
          </div>
          <p className="catalog-result-count">
            找到 <strong>{filteredCatalog.length}</strong> 个型号
          </p>
        </div>

        {visibleCatalog.length > 0 ? (
          <div className="catalog-grid">
            {visibleCatalog.map((product) => (
              <article className="catalog-card" key={product.id}>
                <button
                  type="button"
                  className="catalog-image-button"
                  onClick={() => setSelectedCatalogProduct(product)}
                  aria-label={`查看${product.name}详情`}
                >
                  {product.image ? (
                    <img src={product.image} alt={product.name} loading="lazy" />
                  ) : (
                    <span className="catalog-placeholder">GAUDELOT</span>
                  )}
                  <small>{product.category}</small>
                </button>
                <div className="catalog-card-body">
                  <p>{product.code}</p>
                  <h3>{product.name}</h3>
                  <dl>
                    {getFeaturedSpecs(product).map(([label, value]) => (
                      <div key={label}><dt>{label}</dt><dd>{value}</dd></div>
                    ))}
                  </dl>
                  <button type="button" onClick={() => setSelectedCatalogProduct(product)}>
                    查看完整参数 <span>→</span>
                  </button>
                </div>
              </article>
            ))}
          </div>
        ) : (
          <div className="catalog-empty">
            <strong>没有找到匹配型号</strong>
            <p>可以尝试减少关键词，或切换到“全部产品”。</p>
            <button type="button" onClick={() => { setCatalogQuery(""); setCatalogCategory("全部产品"); }}>
              清除筛选
            </button>
          </div>
        )}

        {catalogLimit < filteredCatalog.length && (
          <div className="load-more-wrap">
            <button type="button" onClick={() => setCatalogLimit((current) => current + 24)}>
              加载更多产品 <span>已显示 {visibleCatalog.length} / {filteredCatalog.length}</span>
            </button>
          </div>
        )}
      </section>

      {selectedCatalogProduct && (
        <div
          className="catalog-modal-backdrop"
          role="presentation"
          onMouseDown={() => setSelectedCatalogProduct(null)}
        >
          <section
            className="catalog-modal"
            role="dialog"
            aria-modal="true"
            aria-labelledby="catalog-modal-title"
            onMouseDown={(event) => event.stopPropagation()}
          >
            <button
              className="catalog-modal-close"
              type="button"
              onClick={() => setSelectedCatalogProduct(null)}
              aria-label="关闭产品详情"
            >×</button>
            <div className="catalog-modal-product">
              <div className="catalog-modal-image">
                {selectedCatalogProduct.image ? (
                  <img src={selectedCatalogProduct.image} alt={selectedCatalogProduct.name} />
                ) : (
                  <span className="catalog-placeholder">GAUDELOT</span>
                )}
              </div>
              <div>
                <p className="step-kicker">{selectedCatalogProduct.category}</p>
                <h2 id="catalog-modal-title">{selectedCatalogProduct.name}</h2>
                <code>{selectedCatalogProduct.code}</code>
                <p className="catalog-source-note">官方产品目录第 {selectedCatalogProduct.page} 页</p>
              </div>
            </div>
            <div className="catalog-spec-table">
              {Object.entries(selectedCatalogProduct.specs).map(([label, value]) => (
                <div key={label}><span>{label}</span><strong>{value}</strong></div>
              ))}
            </div>
            <div className="catalog-modal-actions">
              <button
                className="panel-primary"
                type="button"
                onClick={() => {
                  setSelectedCatalogProduct(null);
                  setStage(1);
                  window.scrollTo({ top: 0, behavior: "smooth" });
                }}
              >
                用AI继续确认需求 <span>→</span>
              </button>
              <p>具体价格、交期及最终适配结果以工程师确认和正式文件为准。</p>
            </div>
          </section>
        </div>
      )}

      <section className="how-section" id="how">
        <div className="how-copy">
          <p className="eyebrow light"><span /> 无人销售边界</p>
          <h2>标准需求自动完成，<br />复杂项目及时接管。</h2>
          <p>AI负责需求采集、初选、说明和线索评分。工程师负责最终适配、认证和技术承诺，销售负责大客户商业条件。</p>
          <button className="primary-action light-button" type="button" onClick={() => { setStage(1); window.scrollTo({ top: 0, behavior: "smooth" }); }}>
            体验完整流程 <span>→</span>
          </button>
        </div>
        <div className="flow-list">
          <div><b>01</b><span><strong>客户自助描述需求</strong><small>应用、参数、数量和现用型号</small></span></div>
          <div><b>02</b><span><strong>AI生成候选方案</strong><small>匹配理由、参考价格和风险提示</small></span></div>
          <div><b>03</b><span><strong>标准样品自动申请</strong><small>形成结构化线索卡和跟进计划</small></span></div>
          <div><b>04</b><span><strong>复杂项目人工接管</strong><small>技术复核、测试、报价和量产</small></span></div>
        </div>
      </section>

      <footer>
        <div className="brand footer-brand">
          <span className="brand-mark">G</span>
          <span><strong>GAUDELOT</strong><small>高徳乐 · 精密传动</small></span>
        </div>
        <p>AI选型结果仅供初步筛选，最终型号、价格、交期与适配结果以工程师和正式文件确认为准。</p>
        <span>内部原型 · V1</span>
      </footer>
    </main>
  );
}
