mama-box/demo/bump/index.html

<!doctype html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,maximum-scale=1,user-scalable=no,viewport-fit=cover">
<title>宝宝在肚子里动 · 创意预览</title>
<!-- 2026-10-03 创意预览（不进正式首页）：「整块头图是妈妈的肚皮」v3。
     头图纹理改为 JS 现场合成（canvas）：肚皮底 belly_bg.jpg + LOGO + 倒计时 + 周数 + 进度条 + 右侧「这周的宝宝」玻璃卡。
     右侧原来是胎儿插画，现在放「这周宝宝学会了 · 睁眼看光」+ 宝宝的一句悄悄话，顶出来/被摁回去时换话；
     卡片也画在纹理里，所以被顶到时会和字一起鼓起来变形。
     WebGL 把纹理当一层肉肉的肚皮：
       · 宝宝时不时用不同部位往外顶：小脚丫（尖一点的小帐篷，顶上隐约几个脚趾）、小拳头（小而圆）、
         小膝盖（长条）、小屁股（又大又缓，还会慢慢拱着挪一段）；常常专挑字和卡片顶；
       · 手指戳上去 = 肚皮被按下去一个窝，松手后 duang duang 回弹（欠阻尼弹簧）+ 周围一起晃；
       · 戳中鼓起处 → 被摁回去，往远离手指的方向溜走，过一两秒换个部位、换个地方再顶出来；
       · 头图下方「找找宝宝」收集条：戳回过哪个部位就点亮哪个。
     下面的卡片是首页截图（静态），只为给头图一个真实语境。
     ?rec=1：录屏模式，由 __adv / __tap / __press 逐帧驱动（生成动图用）。 -->
<style>
  html,body{margin:0;background:#F8F3EF;-webkit-tap-highlight-color:transparent;font-family:-apple-system,"PingFang SC","Noto Sans SC",sans-serif}
  .page{position:relative;max-width:480px;margin:0 auto;overflow:hidden}
  .hero{position:relative;width:100%;aspect-ratio:375/270;touch-action:manipulation;cursor:pointer}
  .hero canvas,.hero img{position:absolute;inset:0;width:100%;height:100%;display:block}
  .hero img{opacity:0}               /* WebGL 起不来时退回静态头图 */
  .hero.nogl img{opacity:1}
  .below{display:block;width:100%;margin-top:0}
  /* 头图下缘的「找找宝宝」收集条：和首页「记一下」同一套白色玻璃胶囊语言 */
  .hunt{position:absolute;left:0;right:0;top:0;display:flex;justify-content:center;pointer-events:none;z-index:3}
  .hunt .bar{margin-top:calc(min(100vw,480px) * 216 / 375);display:flex;align-items:center;gap:6px;padding:6px 7px 6px 13px;border-radius:999px;
    background:rgba(255,255,255,.84);-webkit-backdrop-filter:blur(12px) saturate(160%);backdrop-filter:blur(12px) saturate(160%);
    box-shadow:0 8px 20px rgba(180,80,50,.16),inset 0 0 0 1px rgba(255,255,255,.95);white-space:nowrap;
    transition:transform .35s cubic-bezier(.3,1.6,.5,1)}
  .hunt .bar.pop{transform:scale(1.06)}
  .hunt .t{font-size:12px;font-weight:700;color:#C2563B;letter-spacing:.3px;margin-right:2px}
  .hunt .c{display:flex;align-items:center;gap:3px;padding:4px 8px;border-radius:999px;font-size:11.5px;font-weight:600;
    color:#D99A86;background:#FBEDE6;transition:all .3s}
  .hunt .c i{width:6px;height:6px;border-radius:50%;background:#EBC3B4;transition:background .3s}
  .hunt .c.on{color:#fff;background:linear-gradient(135deg,#FF9A72,#F06A45);box-shadow:0 3px 8px rgba(240,106,69,.35)}
  .hunt .c.on i{background:#FFF3C4}
  /* 录屏用的手指 */
  .finger{position:absolute;width:38px;height:38px;margin:-19px 0 0 -19px;border-radius:50%;pointer-events:none;z-index:5;
    background:radial-gradient(circle,rgba(255,255,255,.85) 0 30%,rgba(255,255,255,.35) 55%,rgba(255,255,255,0) 72%);
    box-shadow:0 0 0 2px rgba(255,255,255,.7);opacity:0;transform:scale(1.25);transition:opacity .15s,transform .15s}
  .finger.on{opacity:1;transform:scale(1)}
</style>
</head>
<body>
<div class="page">
  <div class="hero" id="hero">
    <img src="belly.jpg" alt="">
    <canvas id="cv"></canvas>
    <i class="finger" id="finger"></i>
  </div>
  <div class="hunt"><div class="bar" id="hunt"><span class="t">找找宝宝</span>
    <span class="c" data-k="foot"><i></i>小脚丫</span><span class="c" data-k="fist"><i></i>小拳头</span>
    <span class="c" data-k="knee"><i></i>小膝盖</span><span class="c" data-k="butt"><i></i>小屁股</span></div></div>
  <img class="below" src="below.jpg" alt="">
</div>
<script>
(function () {
  const W = 375, H = 270, SC = 3;               // 头图逻辑尺寸（与首页一致），纹理按 3 倍画
  const REC = /[?&]rec=1/.test(location.search);
  const hero = document.getElementById('hero'), cv = document.getElementById('cv');
  const hunt = document.getElementById('hunt'), finger = document.getElementById('finger');
  const gl = cv.getContext('webgl', { premultipliedAlpha: false, preserveDrawingBuffer: REC, antialias: true });
  if (!gl) { hero.classList.add('nogl'); return; }

  const VS = 'attribute vec2 a;varying vec2 v;void main(){v=a*.5+.5;v.y=1.-v.y;gl_Position=vec4(a,0.,1.);}';
  const FS = `
precision highp float;
varying vec2 v;
uniform sampler2D T;
uniform vec2 S;           // 逻辑尺寸 375x270
uniform vec4 F;           // 鼓起处 x,y,角度,高度(px)
uniform vec4 K;           // 形状 半径x,半径y,尖度(指数),脚趾显隐(0-1)
uniform vec4 G;           // 左右脚(±1),脚趾蜷曲(0-1),拉长量,0
uniform vec4 P;           // 手指 x,y,按压深度(负=凹下去,正=回弹鼓起),0
uniform vec2 J;           // 肚皮整体晃动的位移(px)
uniform float Tm;
float sdE(vec2 p,vec2 c,vec2 r){return (length((p-c)/r)-1.)*min(r.x,r.y);}
vec2 loc(vec2 p){vec2 d=p-F.xy; float c=cos(F.z),s=sin(F.z); return vec2(c*d.x+s*d.y,-s*d.x+c*d.y);}
// 脚趾：只在小脚丫时隐约露一点，圆乎乎、很淡
float toes(vec2 p){
  if(K.w<.01||F.w<.01) return 0.;
  vec2 d=loc(p)/1.2; d.x*=G.x; d.y/=1.+G.z;
  float cu=G.y, ht=0.;
  vec3 toe[5];
  toe[0]=vec3(-6.5,-22.,5.2); toe[1]=vec3(.5,-24.5,4.2); toe[2]=vec3(6.,-23.,3.8); toe[3]=vec3(10.3,-20.,3.5); toe[4]=vec3(13.4,-15.8,3.2);
  for(int i=0;i<5;i++){
    vec3 t=toe[i]; float w=sin(Tm*7.+float(i)*1.3)*.5+.5;
    float sd=length(d-t.xy-vec2(0.,(3.+1.5*w)*cu))-t.z;
    ht=max(ht,smoothstep(5.,-5.,sd)*(.5-.15*cu*w));
  }
  return F.w*K.w*ht;
}
// 鼓起：椭圆的软帐篷，尖度 K.z 越大顶越尖（小脚丫尖、小屁股缓）
float tent(vec2 p){
  if(F.w<.01) return 0.;
  vec2 d=loc(p)/K.xy; d.y/=1.+G.z*.5;
  float r=sqrt(dot(d,d)+.014);
  float u=clamp((1.-r)/(1.-.118),0.,1.);
  return F.w*2.3*pow(u,K.z);
}
float dentR=33.;
float dent(vec2 p){vec2 d=p-P.xy;return P.z*exp(-dot(d,d)/(dentR*dentR));}
float hgt(vec2 p){return tent(p)+toes(p)*.12+dent(p);}
void main(){
  vec2 p=v*S;
  vec3 c0=texture2D(T,v).rgb;
  // 白字也接近页面底色，所以只在下缘弧线那一带（y>185）按颜色判断
  float m=p.y<185.?1.:smoothstep(.03,.12,distance(c0,vec3(.973,.953,.937)));
  float e=1.2;
  vec2 g=vec2(hgt(p+vec2(e,0.))-hgt(p-vec2(e,0.)),hgt(p+vec2(0.,e))-hgt(p-vec2(0.,e)))/(2.*e)*m;
  float h=hgt(p)*m;
  // 肉感：按下去时周围的皮肤被拽向手指，回弹时被推开；整块肚皮再跟着晃
  vec2 dp=p-P.xy;
  float gp=exp(-dot(dp,dp)/(dentR*dentR*2.6));
  float gw=exp(-dot(dp,dp)/(130.*130.));
  vec2 q=p+dp*(-P.z*.03)*gp - J*gw + g*2.2;
  float th=clamp(tent(p)/16.,0.,1.2);
  q-=(p-F.xy)*.36*th;                         // 鼓起处把字往外撑开、放大：越靠近顶越被撑大
  q=mix(p,q,m);
  vec3 c=texture2D(T,clamp(q/S,0.,1.)).rgb;
  vec3 n=normalize(vec3(-g*.85,1.));
  vec3 L=normalize(vec3(-.45,-.75,.9));
  float dif=dot(n,L)-dot(vec3(0.,0.,1.),L);
  c+=vec3(1.,.95,.9)*max(dif,0.)*.30;
  c*=1.+min(dif,0.)*vec3(.28,.36,.38);        // 背光侧偏暖红，像皮肤
  // 鼓起处往右下投一层淡影，让它「立」起来
  vec2 d0=loc(p)/K.xy*68.-vec2(7.,11.); c*=1.-.10*exp(-dot(d0,d0)/(48.*48.))*smoothstep(1.,9.,F.w)*(1.-th)*m;
  float dn=clamp(-dent(p)/10.,0.,1.)*m;
  c*=1.-dn*vec3(.13,.21,.2);
  vec3 Hh=normalize(L+vec3(0.,0.,1.));
  c+=vec3(1.,.97,.95)*pow(max(dot(n,Hh),0.),24.)*.12*smoothstep(.5,4.,abs(h));
  c+=vec3(1.,.88,.8)*smoothstep(2.,12.,h)*.05;  // 顶起处微微透亮
  gl_FragColor=vec4(c,1.);
}`;
  function sh(t, s) { const o = gl.createShader(t); gl.shaderSource(o, s); gl.compileShader(o); if (!gl.getShaderParameter(o, gl.COMPILE_STATUS)) throw gl.getShaderInfoLog(o); return o; }
  const pr = gl.createProgram();
  gl.attachShader(pr, sh(gl.VERTEX_SHADER, VS)); gl.attachShader(pr, sh(gl.FRAGMENT_SHADER, FS)); gl.linkProgram(pr); gl.useProgram(pr);
  const buf = gl.createBuffer(); gl.bindBuffer(gl.ARRAY_BUFFER, buf);
  gl.bufferData(gl.ARRAY_BUFFER, new Float32Array([-1, -1, 1, -1, -1, 1, 1, 1]), gl.STATIC_DRAW);
  const al = gl.getAttribLocation(pr, 'a'); gl.enableVertexAttribArray(al); gl.vertexAttribPointer(al, 2, gl.FLOAT, false, 0, 0);
  const U = n => gl.getUniformLocation(pr, n);
  const uS = U('S'), uF = U('F'), uK = U('K'), uG = U('G'), uP = U('P'), uJ = U('J'), uT = U('Tm');
  gl.uniform2f(uS, W, H);

  /* ---------- 纹理：canvas 现场合成，宝宝卡的悄悄话会变 ---------- */
  const tc = document.createElement('canvas'); tc.width = W * SC; tc.height = H * SC;
  const cx = tc.getContext('2d');
  const SRC = { bg: 'belly_bg.jpg', top: 'top.png', pill: '../_hero/pill.png', week: '../_hero/week.png', prog: '../_hero/prog.png' };
  const IMG = {}; let loaded = 0;
  const tex = gl.createTexture(); let ready = false;
  const FONT = '-apple-system,"PingFang SC","Noto Sans SC",sans-serif';
  const card = { line: '我认得妈妈的声音' };
  function rr(x, y, w, h, r) { cx.beginPath(); cx.moveTo(x + r, y); cx.arcTo(x + w, y, x + w, y + h, r); cx.arcTo(x + w, y + h, x, y + h, r); cx.arcTo(x, y + h, x, y, r); cx.arcTo(x, y, x + w, y, r); cx.closePath(); }
  function compose() {
    cx.setTransform(SC, 0, 0, SC, 0, 0);
    cx.drawImage(IMG.bg, 0, 0, W, H);
    // 右侧原来是宝宝插画的位置：一大团很淡的暖光 + 几颗小光点，让肚皮不空
    const gr = cx.createRadialGradient(292, 118, 6, 292, 118, 120);
    gr.addColorStop(0, 'rgba(255,236,214,.42)'); gr.addColorStop(.55, 'rgba(255,226,200,.14)'); gr.addColorStop(1, 'rgba(255,226,200,0)');
    cx.fillStyle = gr; cx.fillRect(150, 0, 225, 250);
    [[226, 52, 1.6, .55], [352, 44, 1.2, .5], [214, 196, 1.3, .45], [362, 168, 1.8, .4], [246, 210, 1, .5]].forEach(([x, y, r, a]) => {
      const g2 = cx.createRadialGradient(x, y, 0, x, y, r * 4); g2.addColorStop(0, 'rgba(255,255,255,' + a + ')'); g2.addColorStop(1, 'rgba(255,255,255,0)');
      cx.fillStyle = g2; cx.beginPath(); cx.arc(x, y, r * 4, 0, 7); cx.fill();
    });
    cx.drawImage(IMG.top, 0, 0, W, 50);
    cx.drawImage(IMG.pill, 14, 52, 159.69, 42);
    cx.font = '900 13.5px ' + FONT; cx.textBaseline = 'middle';
    cx.shadowColor = 'rgba(120,30,10,.28)'; cx.shadowBlur = 3; cx.shadowOffsetY = 1;
    cx.fillStyle = '#FFF3C4'; cx.fillText('67', 120.6, 73.5);
    cx.shadowColor = 'transparent';
    cx.drawImage(IMG.week, 14, 86, 110.9, 70);
    cx.drawImage(IMG.prog, 14, 150, 192, 36);
    // 「这周宝宝学会了」玻璃卡：30周的发育小变化 + 宝宝的一句悄悄话（被顶/被摁时换话）
    const X = 228, Y = 60, CW = 134, CH = 122;
    cx.save();
    cx.shadowColor = 'rgba(150,55,30,.16)'; cx.shadowBlur = 18; cx.shadowOffsetY = 8;
    rr(X, Y, CW, CH, 20); cx.fillStyle = 'rgba(255,255,255,.17)'; cx.fill();
    cx.restore();
    const hl = cx.createLinearGradient(X, Y, X, Y + CH); hl.addColorStop(0, 'rgba(255,255,255,.24)'); hl.addColorStop(1, 'rgba(255,255,255,.05)');
    rr(X, Y, CW, CH, 20); cx.fillStyle = hl; cx.fill();
    cx.lineWidth = 1; cx.strokeStyle = 'rgba(255,255,255,.55)'; rr(X + .5, Y + .5, CW - 1, CH - 1, 19.5); cx.stroke();
    cx.shadowColor = 'rgba(120,30,10,.25)'; cx.shadowBlur = 4; cx.shadowOffsetY = 1;
    cx.fillStyle = 'rgba(255,255,255,.9)'; cx.font = '600 11px ' + FONT; cx.fillText('这周宝宝学会了', X + 14, Y + 19);
    cx.font = '900 25px ' + FONT; cx.fillStyle = '#fff'; cx.fillText('睁眼看光', X + 13, Y + 45);
    cx.font = '600 10.5px ' + FONT; cx.fillStyle = 'rgba(255,255,255,.9)'; cx.fillText('晒太阳时，我能感觉到亮', X + 14, Y + 68);
    cx.shadowColor = 'transparent';
    cx.fillStyle = 'rgba(255,255,255,.28)'; cx.fillRect(X + 14, Y + 81, CW - 28, 1);
    // 悄悄话：小气泡尾巴 + 一句话
    cx.fillStyle = 'rgba(255,255,255,.92)'; cx.beginPath(); cx.arc(X + 18, Y + 101, 2.6, 0, 7); cx.fill();
    cx.shadowColor = 'rgba(120,30,10,.22)'; cx.shadowBlur = 3; cx.shadowOffsetY = 1;
    cx.font = '600 11px ' + FONT; cx.fillStyle = 'rgba(255,255,255,.95)';
    let ln = card.line; while (cx.measureText(ln).width > CW - 40 && ln.length > 2) ln = ln.slice(0, -1);
    cx.fillText(ln, X + 26, Y + 101.5);
    cx.shadowColor = 'transparent';
    gl.bindTexture(gl.TEXTURE_2D, tex);
    gl.texImage2D(gl.TEXTURE_2D, 0, gl.RGB, gl.RGB, gl.UNSIGNED_BYTE, tc);
  }
  function setCard(line) { card.line = line; if (ready) compose(); }
  Object.keys(SRC).forEach(k => {
    const im = new Image(); im.onload = () => {
      IMG[k] = im;
      if (++loaded === Object.keys(SRC).length) {
        gl.bindTexture(gl.TEXTURE_2D, tex);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MIN_FILTER, gl.LINEAR);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_MAG_FILTER, gl.LINEAR);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_S, gl.CLAMP_TO_EDGE);
        gl.texParameteri(gl.TEXTURE_2D, gl.TEXTURE_WRAP_T, gl.CLAMP_TO_EDGE);
        ready = true; compose();
        (document.fonts ? document.fonts.ready : Promise.resolve()).then(() => { compose(); window.__ready = true; });
      }
    };
    im.src = SRC[k];
  });

  function resize() {
    const dpr = Math.min(window.devicePixelRatio || 1, 3), r = hero.getBoundingClientRect();
    cv.width = Math.round(r.width * dpr); cv.height = Math.round(r.height * dpr);
    gl.viewport(0, 0, cv.width, cv.height);
  }
  resize(); addEventListener('resize', resize);

  /* ---------- 宝宝的各个部位：形状不同，动法不同 ---------- */
  // rx/ry 椭圆半径，sharp 尖度，toe 脚趾显隐，amp 高度，dur 停留秒数，roll 是否慢慢拱着挪
  const PARTS = {
    foot: { name: '小脚丫', say: ['妈妈，我在伸腿', '踢一脚打个招呼'], caught: '脚丫被你抓到啦', rx: 64, ry: 72, sharp: 1.7, toe: 1, amp: 9.5, dur: [2.4, 3.4] },
    fist: { name: '小拳头', say: ['我在挥小拳头', '妈妈看我力气大'], caught: '小拳头被你握住啦', rx: 46, ry: 46, sharp: 1.9, toe: 0, amp: 8, dur: [1.8, 2.6] },
    knee: { name: '小膝盖', say: ['我在翻个身', '这里有点挤哦'], caught: '膝盖被摁回去啦', rx: 50, ry: 86, sharp: 1.6, toe: 0, amp: 8.5, dur: [2.2, 3] },
    butt: { name: '小屁股', say: ['我在伸懒腰～', '换个姿势睡觉'], caught: '屁股被你拍到了', rx: 100, ry: 84, sharp: 1.25, toe: 0, amp: 7, dur: [3, 3.8], roll: true },
  };
  const ORDER = ['foot', 'fist', 'butt', 'knee'];
  const found = {};

  const spring = (o, dt) => { const a = -o.k * (o.v - o.to) - o.c * o.vel; o.vel += a * dt; o.v += o.vel * dt; };
  const ft = { x: 290, y: 120, ang: -.3, side: 1, part: PARTS.foot, h: { v: 0, vel: 0, to: 0, k: 140, c: 11 }, curl: 0, stretch: 0, life: 0, dur: 3, ox: 0, oy: 0 };
  // 手指按压：欠阻尼，松手后过冲成一个小鼓包再回来 → duang duang
  const pk = { x: 0, y: 0, d: { v: 0, vel: 0, to: 0, k: 520, c: 6.5 }, held: false };
  // 肚皮整体晃：二维弹簧，阻尼更小、频率更低
  const jg = { x: { v: 0, vel: 0, to: 0, k: 210, c: 4.2 }, y: { v: 0, vel: 0, to: 0, k: 210, c: 4.2 } };
  let mode = 'wait', wait = .5, t = 0, seq = 0;

  // 一半以上的概率专挑字和卡片顶（大字「30」、倒计时胶囊、进度条、slogan、宝宝卡），字会被撑起来变形
  const TEXT_SPOTS = [[62, 120], [100, 74], [104, 124], [96, 166], [230, 26], [292, 104], [300, 80], [150, 168]];
  function pickSpot() {
    for (let i = 0; i < 40; i++) {
      let x, y;
      if (Math.random() < .7) { const s = TEXT_SPOTS[Math.floor(Math.random() * TEXT_SPOTS.length)]; x = s[0] + (Math.random() - .5) * 16; y = s[1] + (Math.random() - .5) * 10; }
      else { x = 220 + Math.random() * 130; y = 70 + Math.random() * 120; }
      if (Math.hypot(x - ft.x, y - ft.y) > 80) return { x, y };
    }
    return { x: 300, y: 120 };
  }
  function appear() {
    const key = ORDER[seq++ % ORDER.length], P = PARTS[key];
    const s = pickSpot();
    ft.key = key; ft.part = P;
    ft.x = s.x; ft.y = s.y; ft.ox = ft.oy = 0;
    ft.ang = (Math.random() - .5) * 1.4 + (s.x > 190 ? .25 : -.25);
    ft.side = Math.random() < .5 ? 1 : -1;
    ft.rollDir = s.x > 200 ? -1 : 1;
    ft.h.to = P.amp; ft.h.k = P.roll ? 70 : 140; ft.h.c = P.roll ? 9 : 9; ft.h.vel += P.roll ? 30 : 120;
    ft.life = 0; ft.dur = P.dur[0] + Math.random() * (P.dur[1] - P.dur[0]); ft.kicked = false;
    mode = 'show';
    setCard(P.say[Math.floor(Math.random() * P.say.length)]);
  }
  function hide(fast) {
    ft.h.to = 0;
    if (fast) { ft.h.k = 700; ft.h.c = 45; } else { ft.h.k = 60; ft.h.c = 14; }
    mode = 'hide';
  }

  function press(x, y, on) {
    if (on) {
      pk.x = x; pk.y = y; pk.held = true; pk.d.to = -14; pk.d.k = 380; pk.d.c = 22;
      const fx = ft.x + ft.ox, fy = ft.y + ft.oy, R = Math.max(ft.part.rx, ft.part.ry) * .8;
      if ((mode === 'show' || (mode === 'hide' && ft.h.v > 3)) && Math.hypot(x - fx, y - fy) < R) {
        // 摁中：被摁回去，往远离手指的方向溜
        let dx = fx - x, dy = fy - y, l = Math.hypot(dx, dy);
        if (l < 6) { dx = -Math.sin(ft.ang); dy = Math.cos(ft.ang); l = 1; }
        ft.flee = { dx: dx / l, dy: dy / l, t: 0 };
        hide(true); mode = 'flee'; wait = 1.1 + Math.random() * .8;
        if (navigator.vibrate) navigator.vibrate(15);
        setCard(ft.part.caught);
        found[ft.key] = true;
        const chip = hunt.querySelector('[data-k="' + ft.key + '"]'); if (chip) chip.classList.add('on');
        hunt.classList.add('pop'); setTimeout(() => hunt.classList.remove('pop'), 300);
        if (Object.keys(found).length === ORDER.length) hunt.querySelector('.t').textContent = '全找到啦！';
      }
    } else if (pk.held) {
      pk.held = false;
      // 松手：弹簧变软、阻尼变小，皮肉弹回来并过冲 → duang duang
      pk.d.to = 0; pk.d.k = 360; pk.d.c = 4.6; pk.d.vel += 170;
      jg.y.vel += 150; jg.x.vel += (Math.random() - .5) * 90;
    }
  }
  hero.addEventListener('pointerdown', e => {
    const r = hero.getBoundingClientRect();
    hero.setPointerCapture && hero.setPointerCapture(e.pointerId);
    press((e.clientX - r.left) / r.width * W, (e.clientY - r.top) / r.height * H, true);
  });
  const up = () => press(0, 0, false);
  hero.addEventListener('pointerup', up); hero.addEventListener('pointercancel', up);

  function step(dt) {
    t += dt;
    if (mode === 'wait') { wait -= dt; if (wait <= 0) appear(); }
    else if (mode === 'show') {
      ft.life += dt;
      const u = ft.life, P = ft.part;
      if (P.roll) {
        // 小屁股：慢慢拱着往一边挪
        ft.ox = ft.rollDir * 30 * Math.min(u / ft.dur, 1); ft.oy = -6 * Math.sin(Math.min(u / ft.dur, 1) * Math.PI);
        ft.wob = Math.sin(u * 1.2) * .08; ft.curl = 0; ft.stretch = .05 * Math.sin(u * 1.6);
      } else {
        ft.curl = P.toe ? Math.max(0, Math.sin(u * 3.2 - .6)) * .9 : 0;
        ft.stretch = .06 * Math.sin(u * 2.4);
        ft.wob = Math.sin(u * 2.1) * .12;
        if (u > ft.dur * .45 && !ft.kicked) { ft.kicked = true; ft.h.vel += 70; }   // 中途再顶一下
      }
      if (u > ft.dur) hide(false);
    } else if (mode === 'hide') {
      if (ft.h.v < .3) { mode = 'wait'; wait = .9 + Math.random() * 1.2; }
    } else if (mode === 'flee') {
      const f = ft.flee; f.t += dt;
      const s = 26 * (1 - Math.exp(-f.t * 7));
      ft.ox = f.dx * s; ft.oy = f.dy * s;
      ft.stretch = .35 * Math.exp(-f.t * 5);
      ft.curl = 1;
      wait -= dt;
      if (wait <= 0) appear();
    }
    if (mode !== 'show' && mode !== 'flee') { ft.stretch *= Math.exp(-dt * 6); }
    spring(ft.h, dt); if (ft.h.v < 0) { ft.h.v = 0; ft.h.vel *= -.2; }
    spring(pk.d, dt); spring(jg.x, dt); spring(jg.y, dt);
  }
  function draw() {
    if (!ready) return;
    const P = ft.part, wob = mode === 'show' ? (ft.wob || 0) : 0;
    gl.uniform4f(uF, ft.x + ft.ox, ft.y + ft.oy, ft.ang + wob, ft.h.v);
    gl.uniform4f(uK, P.rx, P.ry, P.sharp, P.toe);
    gl.uniform4f(uG, ft.side, ft.curl, ft.stretch, 0);
    gl.uniform4f(uP, pk.x, pk.y, pk.d.v, 0);
    gl.uniform2f(uJ, jg.x.v, jg.y.v);
    gl.uniform1f(uT, t);
    gl.drawArrays(gl.TRIANGLE_STRIP, 0, 4);
  }

  if (REC) {
    // 录屏：由外部按帧推进
    window.__adv = ms => { const n = Math.round(ms / (1000 / 120)); for (let i = 0; i < n; i++) step(1 / 120); draw(); };
    window.__press = (x, y, on) => press(x, y, on);
    window.__tap = (x, y) => press(x, y, true);
    window.__foot = () => ({ x: ft.x + ft.ox, y: ft.y + ft.oy, h: ft.h.v, mode, key: ft.key });
    window.__finger = (x, y, on) => {
      finger.style.left = x / W * 100 + '%'; finger.style.top = y / H * 100 + '%';
      finger.classList.toggle('on', !!on);
    };
    window.__seed = s => { let z = s; Math.random = () => ((z = (z * 16807) % 2147483647) / 2147483647); };
  } else {
    let last = performance.now();
    (function loop(now) {
      const dt = Math.min((now - last) / 1000, 1 / 20); last = now;
      const n = Math.max(1, Math.round(dt * 120));
      for (let i = 0; i < n; i++) step(dt / n);
      draw(); requestAnimationFrame(loop);
    })(last);
  }
})();
</script>
</body>
</html>