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<!DOCTYPE html>
<html lang="ar" dir="rtl">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=no">
<meta name="theme-color" content="#04060f">
<title>الأرض 3D | دقة عالية</title>
<style>
  :root{
    --bg-0:#03050c; --bg-1:#070d1c;
    --accent:#4ea8ff; --accent-2:#6ef2c0; --accent-3:#ffb45e;
    --panel:rgba(9,16,32,.68); --panel-solid:#0a1224;
    --border:rgba(110,170,255,.20); --border-strong:rgba(110,170,255,.45);
    --text:#e9f2ff; --muted:#8ba3c7; --danger:#ff6b6b;
    --radius:16px; --shadow:0 18px 50px rgba(0,0,0,.55);
  }
  *{margin:0;padding:0;box-sizing:border-box;-webkit-tap-highlight-color:transparent}
  html,body{
    width:100%;height:100%;overflow:hidden;
    background:radial-gradient(ellipse at 50% 40%, #0a1430 0%, var(--bg-1) 45%, var(--bg-0) 100%);
    color:var(--text);
    font-family:"Segoe UI","Tahoma",system-ui,-apple-system,sans-serif;
    font-size:15px; user-select:none;
  }
  #app{position:fixed;inset:0;overflow:hidden}
  #app canvas{display:block;width:100%;height:100%;outline:none;cursor:grab}
  #app canvas:active{cursor:grabbing}
  #glowBg{
    position:fixed;inset:0;pointer-events:none;z-index:0;
    background:
      radial-gradient(circle at 22% 18%, rgba(78,168,255,.13), transparent 42%),
      radial-gradient(circle at 78% 82%, rgba(110,242,192,.08), transparent 46%);
    mix-blend-mode:screen;
  }
  #loader{
    position:fixed;inset:0;z-index:100;
    display:flex;align-items:center;justify-content:center;
    background:radial-gradient(ellipse at center,#08101f 0%,#03050c 100%);
    transition:opacity .7s ease, visibility .7s ease;
  }
  #loader.hidden{opacity:0;visibility:hidden;pointer-events:none}
  .loader-inner{
    display:flex;flex-direction:column;align-items:center;gap:16px;
    padding:0 24px;text-align:center;max-width:520px;
  }
  .planet-loader{
    width:96px;height:96px;border-radius:50%;
    background:radial-gradient(circle at 32% 30%,#7ec8ff 0%,#2a6fd6 35%,#0d2a63 70%,#05132e 100%);
    box-shadow:0 0 42px rgba(78,168,255,.55), inset -14px -10px 34px rgba(0,0,0,.75);
    position:relative; animation:spinPlanet 3.4s linear infinite;
  }
  .planet-loader::after{
    content:"";position:absolute;inset:-14px;border-radius:50%;
    border:1px solid rgba(110,180,255,.35);
    border-top-color:rgba(110,242,192,.85);
    animation:spinRing 1.6s linear infinite;
  }
  @keyframes spinPlanet{from{transform:rotate(0)}to{transform:rotate(360deg)}}
  @keyframes spinRing{from{transform:rotate(0)}to{transform:rotate(-360deg)}}
  .loader-inner h1{font-size:20px;font-weight:600;letter-spacing:.4px}
  #loadStatus{font-size:13px;color:var(--muted);min-height:18px}
  .bar{
    width:300px;height:5px;border-radius:99px;
    background:rgba(120,170,255,.14);overflow:hidden;position:relative;
  }
  .bar i{
    display:block;height:100%;width:0%;border-radius:99px;
    background:linear-gradient(90deg,var(--accent),var(--accent-2));
    transition:width .25s ease; box-shadow:0 0 14px rgba(78,168,255,.85);
  }
  #loadPct{font-size:12px;color:var(--muted);letter-spacing:1px;font-variant-numeric:tabular-nums}
  #topbar{
    position:fixed;top:0;left:0;right:0;z-index:20;
    display:flex;align-items:center;justify-content:space-between;
    padding:14px 20px;pointer-events:none;
  }
  .brand{
    display:flex;align-items:center;gap:12px;
    background:var(--panel);backdrop-filter:blur(14px);
    border:1px solid var(--border);border-radius:var(--radius);
    padding:10px 16px;box-shadow:var(--shadow);pointer-events:auto;
  }
  .brand .dot{
    width:10px;height:10px;border-radius:50%;
    background:var(--accent-2); box-shadow:0 0 12px var(--accent-2);
    animation:pulseDot 2.2s ease-in-out infinite;
  }
  @keyframes pulseDot{0%,100%{opacity:1;transform:scale(1)}50%{opacity:.45;transform:scale(.8)}}
  .brand strong{display:block;font-size:14px;font-weight:600;line-height:1.25}
  .brand small{display:block;font-size:11px;color:var(--muted);line-height:1.3}
  .stats{display:flex;gap:8px;pointer-events:auto}
  .stats span{
    display:flex;align-items:center;gap:6px;
    background:var(--panel);backdrop-filter:blur(14px);
    border:1px solid var(--border);border-radius:12px;
    padding:8px 13px;font-size:11px;color:var(--muted);letter-spacing:.3px;
  }
  .stats b{
    color:var(--accent);font-weight:600;font-size:13px;
    font-variant-numeric:tabular-nums;min-width:26px;text-align:center;
  }
  .stats span:last-child b{color:var(--accent-2)}
  #panel{
    position:fixed;top:88px;right:20px;z-index:30;
    width:290px;max-height:calc(100vh - 130px);
    background:var(--panel);backdrop-filter:blur(16px);
    border:1px solid var(--border);border-radius:var(--radius);
    box-shadow:var(--shadow);
    display:flex;flex-direction:column;overflow:hidden;
    transition:transform .38s cubic-bezier(.4,0,.2,1), opacity .3s;
  }
  #panel.collapsed{transform:translateX(calc(100% + 34px));opacity:0;pointer-events:none}
  .panel-head{
    display:flex;align-items:center;justify-content:space-between;
    padding:14px 16px;border-bottom:1px solid var(--border);
    background:rgba(255,255,255,.02);
  }
  .panel-head h2{font-size:13px;font-weight:600;letter-spacing:.4px;display:flex;align-items:center;gap:8px}
  .panel-head h2::before{
    content:"";width:3px;height:14px;border-radius:2px;
    background:linear-gradient(180deg,var(--accent),var(--accent-2));
  }
  .panel-body{padding:8px 16px 18px;overflow-y:auto;flex:1}
  .panel-body::-webkit-scrollbar{width:5px}
  .panel-body::-webkit-scrollbar-thumb{background:rgba(110,170,255,.3);border-radius:9px}
  .panel-body::-webkit-scrollbar-track{background:transparent}
  .group{margin-top:14px}
  .group-title{
    font-size:10.5px;text-transform:uppercase;letter-spacing:1.6px;
    color:var(--muted);margin-bottom:10px;display:flex;align-items:center;gap:8px;
  }
  .group-title::after{content:"";flex:1;height:1px;background:var(--border)}
  .row{margin-bottom:14px}
  .row-top{
    display:flex;justify-content:space-between;align-items:center;
    margin-bottom:7px;font-size:12.5px;color:#c6d8f2;
  }
  .row-top b{
    color:var(--accent);font-weight:600;font-size:11.5px;
    font-variant-numeric:tabular-nums;
    background:rgba(78,168,255,.10);
    padding:2px 8px;border-radius:7px;border:1px solid rgba(78,168,255,.18);
  }
  input[type=range]{
    -webkit-appearance:none;appearance:none;
    width:100%;height:4px;border-radius:99px;
    background:rgba(120,170,255,.16);outline:none;cursor:pointer;
  }
  input[type=range]::-webkit-slider-thumb{
    -webkit-appearance:none;appearance:none;
    width:15px;height:15px;border-radius:50%;
    background:linear-gradient(145deg,#8fd0ff,var(--accent));
    border:2px solid #0a1830;
    box-shadow:0 0 10px rgba(78,168,255,.85);
    transition:transform .16s ease;
  }
  input[type=range]::-webkit-slider-thumb:hover{transform:scale(1.22)}
  input[type=range]::-moz-range-thumb{
    width:14px;height:14px;border-radius:50%;
    background:linear-gradient(145deg,#8fd0ff,var(--accent));
    border:2px solid #0a1830;box-shadow:0 0 10px rgba(78,168,255,.85);cursor:pointer;
  }
  .toggle{
    display:flex;align-items:center;justify-content:space-between;
    padding:9px 2px;font-size:13px;color:#c6d8f2;cursor:pointer;
    border-bottom:1px solid rgba(110,170,255,.07);
  }
  .toggle:last-child{border-bottom:none}
  .toggle:hover{color:#fff}
  .switch{
    position:relative;width:40px;height:22px;flex-shrink:0;
    border-radius:99px;background:rgba(120,170,255,.16);
    border:1px solid rgba(110,170,255,.20);
    transition:background .25s, border-color .25s;
  }
  .switch::after{
    content:"";position:absolute;top:2px;left:2px;
    width:16px;height:16px;border-radius:50%;
    background:#8ba3c7;
    transition:transform .25s cubic-bezier(.4,0,.2,1), background .25s;
  }
  .toggle input{display:none}
  .toggle input:checked + .switch{background:rgba(78,168,255,.32);border-color:var(--border-strong)}
  .toggle input:checked + .switch::after{
    transform:translateX(18px);
    background:linear-gradient(145deg,#8fd0ff,var(--accent-2));
    box-shadow:0 0 10px rgba(110,242,192,.8);
  }
  html[dir="rtl"] .switch::after{left:auto;right:2px}
  html[dir="rtl"] .toggle input:checked + .switch::after{transform:translateX(-18px)}
  .btns{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:6px}
  .btn{
    display:flex;align-items:center;justify-content:center;gap:6px;
    padding:10px 8px;font-size:12px;font-family:inherit;font-weight:500;
    color:#cfe1fa;background:rgba(110,170,255,.08);
    border:1px solid var(--border);border-radius:11px;
    cursor:pointer;transition:all .2s ease;
  }
  .btn:hover{background:rgba(78,168,255,.20);border-color:var(--border-strong);color:#fff;transform:translateY(-1px)}
  .btn:active{transform:translateY(0) scale(.98)}
  .btn.primary{
    background:linear-gradient(135deg,rgba(78,168,255,.28),rgba(110,242,192,.20));
    border-color:var(--border-strong);color:#fff;
  }
  .btn.wide{grid-column:1 / -1}
  .btn:disabled{opacity:.55;cursor:wait}
  #panelToggle{
    position:fixed;top:88px;right:20px;z-index:29;
    width:44px;height:44px;border-radius:13px;
    background:var(--panel);backdrop-filter:blur(14px);
    border:1px solid var(--border);box-shadow:var(--shadow);
    display:none;align-items:center;justify-content:center;
    cursor:pointer;color:var(--accent);font-size:18px;
    transition:transform .2s;
  }
  #panelToggle:hover{transform:scale(1.06)}
  #panelToggle.show{display:flex}
  #hint{
    position:fixed;bottom:18px;left:50%;transform:translateX(-50%);
    z-index:20;pointer-events:none;
    background:var(--panel);backdrop-filter:blur(14px);
    border:1px solid var(--border);border-radius:99px;
    padding:9px 20px;font-size:12px;color:var(--muted);
    white-space:nowrap;box-shadow:var(--shadow);transition:opacity .5s;
  }
  #hint b{color:var(--accent);font-weight:500}
  #hint.fade{opacity:0}
  #toast{
    position:fixed;bottom:76px;left:50%;transform:translate(-50%,18px);
    z-index:60;pointer-events:none;opacity:0;
    background:rgba(10,20,40,.92);backdrop-filter:blur(14px);
    border:1px solid var(--border-strong);border-radius:12px;
    padding:10px 20px;font-size:13px;color:var(--text);
    box-shadow:var(--shadow);transition:opacity .3s, transform .3s;
  }
  #toast.show{opacity:1;transform:translate(-50%,0)}
  @media (max-width: 860px){
    #panel{top:auto;bottom:0;right:0;left:0;width:100%;max-height:60vh;border-radius:20px 20px 0 0;border-bottom:none}
    #panel.collapsed{transform:translateY(calc(100% + 20px))}
    #panelToggle{top:auto;bottom:20px;right:20px;display:flex}
    #panelToggle.show{display:flex}
    #hint{display:none}
    .brand small{display:none}
  }
  @media (max-width: 460px){
    .brand{padding:8px 12px}
    .brand strong{font-size:12.5px}
    .stats span{font-size:10px;padding:6px 9px}
  }
</style>
</head>
<body>

<div id="app"></div>
<div id="glowBg"></div>

<div id="loader">
  <div class="loader-inner">
    <div class="planet-loader"></div>
    <h1>جارٍ بناء كوكب الأرض بدقة عالية…</h1>
    <p id="loadStatus">تهيئة المشهد</p>
    <div class="bar"><i id="loadBar"></i></div>
    <span id="loadPct">0%</span>
  </div>
</div>

<header id="topbar">
  <div class="brand">
    <span class="dot"></span>
    <div>
      <strong>الأرض ثلاثية الأبعاد</strong>
      <small>محاكاة عالية الدقة · Three.js</small>
    </div>
  </div>
  <div class="stats">
    <span>FPS <b id="fps">--</b></span>
    <span>مسافة <b id="dist">0</b></span>
  </div>
</header>

<div id="panelToggle" title="إظهار لوحة التحكم">⚙</div>

<aside id="panel">
  <div class="panel-head">
    <h2>لوحة التحكم</h2>
    <div class="btn" id="collapseBtn" style="padding:5px 11px;font-size:14px;border-radius:9px">✕</div>
  </div>

  <div class="panel-body">

    <div class="group">
      <div class="group-title">الحركة والدوران</div>
      <div class="row">
        <div class="row-top"><span>سرعة دوران الأرض</span><b id="vSpin">1.0</b></div>
        <input type="range" id="spin" min="0" max="5" step="0.1" value="1">
      </div>
      <div class="row">
        <div class="row-top"><span>سرعة السحاب</span><b id="vCloud">1.0</b></div>
        <input type="range" id="cloud" min="0" max="4" step="0.1" value="1">
      </div>
      <div class="row">
        <div class="row-top"><span>سرعة دوران الكاميرا</span><b id="vAuto">0.0</b></div>
        <input type="range" id="auto" min="0" max="3" step="0.1" value="0">
      </div>
      <div class="row">
        <div class="row-top"><span>سرعة القمر</span><b id="vMoon">1.0</b></div>
        <input type="range" id="moonSpeed" min="0" max="4" step="0.1" value="1">
      </div>
    </div>

    <div class="group">
      <div class="group-title">عناصر المشهد</div>
      <label class="toggle"><span>الغلاف الجوي (الوهج)</span><input type="checkbox" id="tAtmo" checked><i class="switch"></i></label>
      <label class="toggle"><span>طبقة السحاب</span><input type="checkbox" id="tClouds" checked><i class="switch"></i></label>
      <label class="toggle"><span>النجوم</span><input type="checkbox" id="tStars" checked><i class="switch"></i></label>
      <label class="toggle"><span>القمر</span><input type="checkbox" id="tMoon" checked><i class="switch"></i></label>
      <label class="toggle"><span>الشمس (النجم البعيد)</span><input type="checkbox" id="tSun" checked><i class="switch"></i></label>
      <label class="toggle"><span>الخطوط الشبكية</span><input type="checkbox" id="tGrid"><i class="switch"></i></label>
    </div>

    <div class="group">
      <div class="group-title">الإضاءة والمؤثرات</div>
      <div class="row">
        <div class="row-top"><span>قوة إضاءة الشمس</span><b id="vLight">1.6</b></div>
        <input type="range" id="light" min="0" max="4" step="0.1" value="1.6">
      </div>
      <div class="row">
        <div class="row-top"><span>الإضاءة المحيطة</span><b id="vAmb">0.18</b></div>
        <input type="range" id="ambient" min="0" max="1" step="0.02" value="0.18">
      </div>
      <div class="row">
        <div class="row-top"><span>لمعان المحيطات</span><b id="vShine">55</b></div>
        <input type="range" id="shine" min="0" max="140" step="1" value="55">
      </div>
      <div class="row">
        <div class="row-top"><span>كثافة الغلاف الجوي</span><b id="vGlow">1.0</b></div>
        <input type="range" id="glow" min="0" max="3" step="0.05" value="1">
      </div>
      <div class="row">
        <div class="row-top"><span>خشونة التضاريس (Bump)</span><b id="vBump">0.028</b></div>
        <input type="range" id="bump" min="0" max="0.09" step="0.002" value="0.028">
      </div>
    </div>

    <div class="group">
      <div class="group-title">أدوات</div>
      <div class="btns">
        <button class="btn" id="btnReset">↺ إعادة الضبط</button>
        <button class="btn" id="btnRandom">🎲 كوكب جديد</button>
        <button class="btn wide primary" id="btnShot">📸 حفظ صورة PNG</button>
        <button class="btn wide" id="btnFull">⛶ ملء الشاشة</button>
      </div>
    </div>

  </div>
</aside>

<div id="hint">
  <b>اسحب</b> للدوران &nbsp;·&nbsp; <b>عجلة الفأرة</b> للتقريب &nbsp;·&nbsp; <b>نقرة مزدوجة</b> لإعادة الضبط
</div>

<div id="toast"></div>

<script src="https://cdnjs.cloudflare.com/ajax/libs/three.js/r128/three.min.js"></script>

<script>
"use strict";

/* ================================================================
   0) إعدادات الدقة العالية — يمكن تعديلها حسب جهازك
   ================================================================ */
const QUALITY = {
  /* خرائط الأرض — رفعنا من 1024×512 إلى 3072×1536 (9 أضعاف البكسلات) */
  EARTH_W: 3072,
  EARTH_H: 1536,

  /* خرائط السحاب — رفعنا من 1024×512 إلى 2048×1024 */
  CLOUD_W: 2048,
  CLOUD_H: 1024,

  /* خريطة القمر — رفعنا من 512×256 إلى 2048×1024 */
  MOON_W: 2048,
  MOON_H: 1024,

  /* شرائح الأجسام الكروية (Segments) */
  EARTH_SEG_W: 256,
  EARTH_SEG_H: 160,
  CLOUD_SEG_W: 192,
  CLOUD_SEG_H: 112,
  ATMO_SEG_W: 128,
  ATMO_SEG_H: 96,
  MOON_SEG_W: 128,
  MOON_SEG_H: 80,

  /* عدد طبقات fBm للتضاريس (5 سابقاً → 7 الآن) */
  FBM_OCT: 7,

  /* أقصى نسبة بكسلات للشاشة (كانت 2) */
  MAX_PIXEL_RATIO: 3,

  /* أنيزوتروبي (كان 16 افتراضيًا) */
  ANISOTROPY: 16,

  /* عدد النجوم */
  STARS: 14000
};

/* ================================================================
   1) أدوات مساعدة
   ================================================================ */
const $ = (s) => document.querySelector(s);
const clamp = (v,a,b) => v<a?a:v>b?b:v;
const lerp = (a,b,t) => a+(b-a)*t;
const smoothstep = (e0,e1,x) => {
  const t = clamp((x-e0)/(e1-e0),0,1);
  return t*t*(3-2*t);
};
const sleep = (ms) => new Promise(r => setTimeout(r, ms));
const nextFrame = () => new Promise(r => requestAnimationFrame(() => r()));
const rand = (a,b) => a + Math.random()*(b-a);

let toastTimer = null;
function toast(msg) {
  const el = $("#toast");
  el.textContent = msg;
  el.classList.add("show");
  clearTimeout(toastTimer);
  toastTimer = setTimeout(() => el.classList.remove("show"), 1800);
}

/* ================================================================
   2) ضوضاء محسّنة (Value Noise 3D + fBm)
   ================================================================ */
function hash3(i,j,k) {
  let n = Math.imul(i, 374761393) + Math.imul(j, 668265263) + Math.imul(k, 1274126177);
  n = Math.imul(n ^ (n >>> 13), 1274126177);
  n ^= n >>> 16;
  return (n >>> 0) / 4294967295;
}

function noise3(x,y,z) {
  const xi = Math.floor(x), yi = Math.floor(y), zi = Math.floor(z);
  const xf = x - xi, yf = y - yi, zf = z - zi;
  const u = xf*xf*(3-2*xf), v = yf*yf*(3-2*yf), w = zf*zf*(3-2*zf);
  const n000 = hash3(xi,   yi,   zi);
  const n100 = hash3(xi+1, yi,   zi);
  const n010 = hash3(xi,   yi+1, zi);
  const n110 = hash3(xi+1, yi+1, zi);
  const n001 = hash3(xi,   yi,   zi+1);
  const n101 = hash3(xi+1, yi,   zi+1);
  const n011 = hash3(xi,   yi+1, zi+1);
  const n111 = hash3(xi+1, yi+1, zi+1);
  const x00 = n000 + (n100-n000)*u;
  const x10 = n010 + (n110-n010)*u;
  const x01 = n001 + (n101-n001)*u;
  const x11 = n011 + (n111-n011)*u;
  const y0 = x00 + (x10-x00)*v;
  const y1 = x01 + (x11-x01)*v;
  return y0 + (y1-y0)*w;
}

function fbm(x,y,z, oct, lac, gain) {
  oct = oct || QUALITY.FBM_OCT;
  lac = lac || 2.0;
  gain = gain || 0.5;
  let amp = 0.5, freq = 1, sum = 0, norm = 0;
  for (let i = 0; i < oct; i++) {
    sum += amp * noise3(x*freq, y*freq, z*freq);
    norm += amp;
    amp *= gain;
    freq *= lac;
  }
  return sum / norm;
}

/* ================================================================
   3) خرائط الكوكب — دقة عالية
   ================================================================ */
const planetCfg = {
  seed: Math.random()*500,
  seaLevel: 0.085,
  landScale: 1.35,
  roughness: 1.0,
  iceEdge: 0.74,
  cloudCover: 0.50
};

async function buildEarthMaps(W,H,onProgress) {
  const colorCv = document.createElement("canvas");
  colorCv.width = W; colorCv.height = H;
  const cctx = colorCv.getContext("2d");
  const cImg = cctx.createImageData(W,H);
  const cpx = cImg.data;

  const heightCv = document.createElement("canvas");
  heightCv.width = W; heightCv.height = H;
  const hctx = heightCv.getContext("2d");
  const hImg = hctx.createImageData(W,H);
  const hpx = hImg.data;

  const specCv = document.createElement("canvas");
  specCv.width = W; specCv.height = H;
  const sctx = specCv.getContext("2d");
  const sImg = sctx.createImageData(W,H);
  const spx = sImg.data;

  const S = planetCfg.seed;
  const latStep = Math.PI / H;
  const reportEvery = Math.max(1, Math.floor(H / 60));

  for (let y = 0; y < H; y++) {
    const lat = Math.PI/2 - (y+0.5)*latStep;
    const cosLat = Math.cos(lat);
    const sinLat = Math.sin(lat);
    const latAbs = Math.abs(lat) / (Math.PI/2);

    for (let x = 0; x < W; x++) {
      const lon = ((x+0.5)/W)*Math.PI*2 - Math.PI;
      const nx = cosLat*Math.cos(lon);
      const ny = sinLat;
      const nz = cosLat*Math.sin(lon);

      /* تشويه المجال */
      const wx = noise3(nx*2.1+S+51.3, ny*2.1+S+37.7, nz*2.1+S+11.1) - 0.5;
      const wy = noise3(nx*2.1+S+91.3, ny*2.1+S+77.7, nz*2.1+S+31.1) - 0.5;
      const wz = noise3(nx*2.1+S+19.3, ny*2.1+S+23.7, nz*2.1+S+67.1) - 0.5;

      const px = nx + wx*0.30;
      const py = ny + wy*0.30;
      const pz = nz + wz*0.30;

      /* قارات كبرى */
      const continent = fbm(
        px*0.85+S+3.3,
        py*0.85+S+7.7,
        pz*0.85+S+1.1,
        3, 2.0, 0.5
      );

      /* تضاريس أساسية (7 طبقات fBm) */
      const base = fbm(
        px*planetCfg.landScale+S+21.7,
        py*planetCfg.landScale+S+13.1,
        pz*planetCfg.landScale+S+5.9,
        QUALITY.FBM_OCT, 2.0, 0.5
      );

      /* طبقة تفاصيل دقيقة جداً (micro-detail) */
      const micro = fbm(
        px*7.5 + S + 301,
        py*7.5 + S + 401,
        pz*7.5 + S + 501,
        4, 2.2, 0.55
      );

      let e = (base - 0.5) * 2.4 * planetCfg.roughness;
      e += (continent - 0.5) * 0.95;
      e += (micro - 0.5) * 0.16;   /* إضافة نتوءات دقيقة */

      const sea = planetCfg.seaLevel;
      const det = noise3(nx*40+S, ny*40+S, nz*40+S);

      let r,g,b,spec;

      if (e < sea) {
        /* محيط */
        const depth = clamp((sea-e)/0.75, 0, 1);
        const d2 = depth*depth;
        r = lerp(28, 2, d2);
        g = lerp(98, 14, d2);
        b = lerp(166, 56, d2);
        const tint = (det-0.5)*14;
        r += tint*0.4; g += tint*0.7; b += tint;
        spec = 245;
      } else {
        /* يابسة */
        const h = clamp((e-sea)/0.62, 0, 1);

        if (h < 0.055) {
          const t = h/0.055;
          r = lerp(220, 172, t);
          g = lerp(204, 172, t);
          b = lerp(152, 120, t);
        } else if (h < 0.26) {
          const t = (h-0.055)/0.205;
          r = lerp(88, 58, t);
          g = lerp(136, 106, t);
          b = lerp(62, 54, t);
        } else if (h < 0.55) {
          const t = (h-0.26)/0.29;
          r = lerp(58, 114, t);
          g = lerp(106, 100, t);
          b = lerp(54, 70, t);
        } else {
          const t = clamp((h-0.55)/0.45, 0, 1);
          r = lerp(114, 162, t);
          g = lerp(100, 150, t);
          b = lerp(70, 134, t);
        }

        /* ثلج على القمم */
        const snow = smoothstep(0.70, 0.90, h);
        r = lerp(r, 246, snow);
        g = lerp(g, 250, snow);
        b = lerp(b, 255, snow);

        /* صحارى */
        const dryness = fbm(px*3.2+S+71, py*3.2+S+17, pz*3.2+S+43, 4, 2, 0.5);
        const desert = smoothstep(0.58, 0.78, dryness) * (1-snow) * (1-smoothstep(0.35,0.6,h));
        r = lerp(r, 198, desert*0.78);
        g = lerp(g, 168, desert*0.78);
        b = lerp(b, 106, desert*0.78);

        /* تفاصيل لونية دقيقة (من micro) */
        const tint = (det-0.5)*22;
        r += tint; g += tint*0.95; b += tint*0.85;

        /* ظل الجبال */
        const sh = smoothstep(0.55, 0.95, h) * (base - 0.5) * 40;
        r += sh; g += sh; b += sh;

        spec = 20;
      }

      /* جليد قطبي */
      const iceNoise = noise3(nx*5.5+S, ny*5.5+S, nz*5.5+S);
      const iceStart = planetCfg.iceEdge + (iceNoise-0.5)*0.16;
      const ice = smoothstep(iceStart, iceStart+0.15, latAbs);
      if (ice > 0) {
        r = lerp(r, 240, ice);
        g = lerp(g, 248, ice);
        b = lerp(b, 255, ice);
        spec = lerp(spec, 80, ice);
      }

      const idx = (y*W + x)*4;
      cpx[idx]     = clamp(r,0,255);
      cpx[idx+1]   = clamp(g,0,255);
      cpx[idx+2]   = clamp(b,0,255);
      cpx[idx+3]   = 255;

      /* ارتفاع — نحفظ حتى التفاصيل الدقيقة */
      const hVal = clamp((e+0.6)/1.6, 0, 1);
      const hByte = Math.round(hVal*255);
      hpx[idx] = hpx[idx+1] = hpx[idx+2] = hByte;
      hpx[idx+3] = 255;

      const sByte = Math.round(clamp(spec, 0, 255));
      spx[idx] = spx[idx+1] = spx[idx+2] = sByte;
      spx[idx+3] = 255;
    }

    if (y % reportEvery === 0) {
      if (onProgress) onProgress(y/H);
      await nextFrame();
    }
  }

  cctx.putImageData(cImg, 0, 0);
  hctx.putImageData(hImg, 0, 0);
  sctx.putImageData(sImg, 0, 0);

  return { colorCv, heightCv, specCv };
}

async function buildCloudMap(W,H,onProgress) {
  const cv = document.createElement("canvas");
  cv.width = W; cv.height = H;
  const ctx = cv.getContext("2d");
  const img = ctx.createImageData(W,H);
  const px = img.data;

  const S = planetCfg.seed + 137;
  const latStep = Math.PI / H;
  const reportEvery = Math.max(1, Math.floor(H/40));

  for (let y = 0; y < H; y++) {
    const lat = Math.PI/2 - (y+0.5)*latStep;
    const cosLat = Math.cos(lat);
    const sinLat = Math.sin(lat);

    for (let x = 0; x < W; x++) {
      const lon = ((x+0.5)/W)*Math.PI*2 - Math.PI;
      const nx = cosLat*Math.cos(lon);
      const ny = sinLat;
      const nz = cosLat*Math.sin(lon);

      const wx = noise3(nx*3.4+S, ny*3.4+S, nz*3.4+S) - 0.5;
      const wz = noise3(nx*3.4+S+61, ny*3.4+S+61, nz*3.4+S+61) - 0.5;

      /* 6 طبقات للتفاصيل الغنية */
      let c = fbm(
        nx*2.6 + wx*0.5 + S,
        ny*2.6 + S,
        nz*2.6 + wz*0.5 + S,
        6, 2.15, 0.55
      );

      /* تفاصيل سحاب دقيقة */
      const micro = fbm(nx*9 + S + 91, ny*9 + S + 91, nz*9 + S + 91, 3, 2.3, 0.55);
      c += (micro - 0.5) * 0.09;

      c += 0.055 * Math.sin(ny*Math.PI*5.5);
      c += 0.035 * Math.sin(ny*Math.PI*11.0);
      c -= Math.abs(ny) * 0.05;

      const th = planetCfg.cloudCover;
      let a = smoothstep(th, th+0.22, c);
      a = clamp(a,0,1);
      a = a*a*(3-2*a);

      const idx = (y*W+x)*4;
      px[idx]     = 255;
      px[idx+1]   = 255;
      px[idx+2]   = 255;
      px[idx+3]   = Math.round(a*255);
    }

    if (y % reportEvery === 0) {
      if (onProgress) onProgress(y/H);
      await nextFrame();
    }
  }

  ctx.putImageData(img, 0, 0);
  return cv;
}

function buildMoonMap(W,H) {
  const cv = document.createElement("canvas");
  cv.width = W; cv.height = H;
  const ctx = cv.getContext("2d");
  const img = ctx.createImageData(W,H);
  const px = img.data;

  const S = planetCfg.seed + 909;
  const latStep = Math.PI / H;

  for (let y = 0; y < H; y++) {
    const lat = Math.PI/2 - (y+0.5)*latStep;
    const cosLat = Math.cos(lat);
    const sinLat = Math.sin(lat);

    for (let x = 0; x < W; x++) {
      const lon = ((x+0.5)/W)*Math.PI*2 - Math.PI;
      const nx = cosLat*Math.cos(lon);
      const ny = sinLat;
      const nz = cosLat*Math.sin(lon);

      /* طبقات أكثر لتفاصيل الفوهات */
      const base = fbm(nx*3.2+S, ny*3.2+S, nz*3.2+S, 5, 2.1, 0.55);
      const craters = fbm(nx*13+S, ny*13+S, nz*13+S, 4, 2.3, 0.6);
      const micro = fbm(nx*32+S, ny*32+S, nz*32+S, 3, 2.4, 0.6);

      let v = 118 + (base-0.5)*82;
      v += (craters-0.5)*44;
      v += (micro-0.5)*14;
      v = clamp(v, 40, 232);

      /* بقع داكنة (ماريا) */
      const maria = smoothstep(0.55, 0.72, base);
      v = lerp(v, 60, maria*0.78);

      /* فوهات دقيقة داكنة */
      const craterDot = smoothstep(0.72, 0.82, craters);
      v = lerp(v, 82, craterDot*0.5);

      const idx = (y*W+x)*4;
      px[idx]     = v;
      px[idx+1]   = v*0.99;
      px[idx+2]   = v*0.95;
      px[idx+3]   = 255;
    }
  }

  ctx.putImageData(img, 0, 0);
  return cv;
}

function buildGlowTexture(size) {
  const cv = document.createElement("canvas");
  cv.width = cv.height = size;
  const ctx = cv.getContext("2d");
  const g = ctx.createRadialGradient(size/2, size/2, 0, size/2, size/2, size/2);
  g.addColorStop(0.00, "rgba(255,255,255,1)");
  g.addColorStop(0.12, "rgba(255,246,214,0.95)");
  g.addColorStop(0.30, "rgba(255,206,120,0.42)");
  g.addColorStop(0.60, "rgba(255,168,72,0.12)");
  g.addColorStop(1.00, "rgba(255,140,40,0)");
  ctx.fillStyle = g;
  ctx.fillRect(0, 0, size, size);
  return cv;
}

/* بقعة دائرية ناعمة للنجوم عالية الدقة */
function buildStarSprite(size) {
  const cv = document.createElement("canvas");
  cv.width = cv.height = size;
  const ctx = cv.getContext("2d");
  const g = ctx.createRadialGradient(size/2, size/2, 0, size/2, size/2, size/2);
  g.addColorStop(0.00, "rgba(255,255,255,1)");
  g.addColorStop(0.25, "rgba(255,255,255,0.75)");
  g.addColorStop(0.55, "rgba(255,255,255,0.16)");
  g.addColorStop(1.00, "rgba(255,255,255,0)");
  ctx.fillStyle = g;
  ctx.fillRect(0, 0, size, size);
  return cv;
}

/* ================================================================
   4) إعداد المشهد
   ================================================================ */
let renderer, scene, camera;
let earthGroup, earthMesh, cloudMesh, atmosphereMesh, moonPivot, moonMesh;
let starField, sunSprite, sunLight, ambientLight, hemiLight, gridHelper;

const cam = {
  theta: 0.75, phi: 1.32, radius: 3.55,
  tTheta: 0.75, tPhi: 1.32, tRadius: 3.55,
  vTheta: 0, vPhi: 0,
  dragging: false, lastPinch: 0
};

const pointers = new Map();

const motion = { spin: 1.0, cloud: 1.0, auto: 0.0, moon: 1.0 };

const EARTH_RADIUS = 1;

function setupRenderer() {
  const container = $("#app");
  renderer = new THREE.WebGLRenderer({
    antialias: true,
    alpha: false,
    preserveDrawingBuffer: true,
    powerPreference: "high-performance"
  });
  renderer.setPixelRatio(Math.min(window.devicePixelRatio || 1, QUALITY.MAX_PIXEL_RATIO));
  renderer.setSize(window.innerWidth, window.innerHeight);
  renderer.outputEncoding = THREE.sRGBEncoding;
  renderer.toneMapping = THREE.ACESFilmicToneMapping;
  renderer.toneMappingExposure = 1.12;
  renderer.setClearColor(0x03050c, 1);
  container.appendChild(renderer.domElement);
}

function setupScene() {
  scene = new THREE.Scene();
  camera = new THREE.PerspectiveCamera(45, window.innerWidth/window.innerHeight, 0.05, 4000);
  camera.position.set(0, 0, 3.55);

  ambientLight = new THREE.AmbientLight(0x3a5a8c, 0.18);
  scene.add(ambientLight);

  hemiLight = new THREE.HemisphereLight(0x8fc4ff, 0x0a1428, 0.22);
  scene.add(hemiLight);

  sunLight = new THREE.DirectionalLight(0xfff3dd, 1.6);
  sunLight.position.set(6, 2.2, 4.5);
  scene.add(sunLight);

  const rim = new THREE.DirectionalLight(0x2a5fa8, 0.22);
  rim.position.set(-6, -2, -5);
  scene.add(rim);
}

function buildStars() {
  const COUNT = QUALITY.STARS;
  const geo = new THREE.BufferGeometry();
  const pos = new Float32Array(COUNT*3);
  const col = new Float32Array(COUNT*3);

  const palette = [
    [1.00,1.00,1.00],
    [0.78,0.86,1.00],
    [1.00,0.93,0.78],
    [1.00,0.80,0.68],
    [0.86,0.94,1.00]
  ];

  for (let i = 0; i < COUNT; i++) {
    const u = Math.random()*2 - 1;
    const t = Math.random()*Math.PI*2;
    const s = Math.sqrt(1-u*u);
    const R = rand(300, 900);
    pos[i*3]     = Math.cos(t)*s*R;
    pos[i*3+1]   = u*R;
    pos[i*3+2]   = Math.sin(t)*s*R;

    const c = palette[(Math.random()*palette.length)|0];
    const bright = rand(0.45, 1.0);
    col[i*3]     = c[0]*bright;
    col[i*3+1]   = c[1]*bright;
    col[i*3+2]   = c[2]*bright;
  }

  geo.setAttribute("position", new THREE.BufferAttribute(pos, 3));
  geo.setAttribute("color", new THREE.BufferAttribute(col, 3));

  const starTex = new THREE.CanvasTexture(buildStarSprite(64));
  starTex.encoding = THREE.sRGBEncoding;

  const mat = new THREE.PointsMaterial({
    size: 2.0,
    vertexColors: true,
    transparent: true,
    opacity: 0.95,
    sizeAttenuation: true,
    depthWrite: false,
    blending: THREE.AdditiveBlending,
    map: starTex
  });

  starField = new THREE.Points(geo, mat);
  scene.add(starField);
  return starField;
}

function buildSunSprite() {
  const tex = new THREE.CanvasTexture(buildGlowTexture(512));
  tex.encoding = THREE.sRGBEncoding;

  const mat = new THREE.SpriteMaterial({
    map: tex, color: 0xffffff, transparent: true,
    blending: THREE.AdditiveBlending, depthWrite: false, depthTest: false,
    opacity: 0.9
  });

  sunSprite = new THREE.Sprite(mat);
  const dir = sunLight.position.clone().normalize();
  sunSprite.position.copy(dir.multiplyScalar(320));
  sunSprite.scale.setScalar(82);
  scene.add(sunSprite);
  return sunSprite;
}

const ATMO_VERT = `
  varying vec3 vViewNormal;
  varying vec3 vWorldNormal;
  void main() {
    vViewNormal  = normalize(normalMatrix * normal);
    vWorldNormal = normalize(mat3(modelMatrix) * normal);
    gl_Position  = projectionMatrix * modelViewMatrix * vec4(position, 1.0);
  }
`;

const ATMO_FRAG = `
  uniform vec3  uColor;
  uniform vec3  uLightDir;
  uniform float uStrength;
  varying vec3 vViewNormal;
  varying vec3 vWorldNormal;
  void main() {
    float rim = pow(max(0.62 - dot(vViewNormal, vec3(0.0,0.0,1.0)), 0.0), 3.0);
    rim = clamp(rim, 0.0, 1.0);
    float lit = smoothstep(-0.42, 0.42, dot(normalize(vWorldNormal), normalize(uLightDir)));
    float alpha = rim * mix(0.10, 1.0, lit) * uStrength;
    gl_FragColor = vec4(uColor, alpha);
  }
`;

function buildAtmosphere() {
  const geo = new THREE.SphereGeometry(
    EARTH_RADIUS * 1.185,
    QUALITY.ATMO_SEG_W, QUALITY.ATMO_SEG_H
  );

  const mat = new THREE.ShaderMaterial({
    uniforms: {
      uColor:    { value: new THREE.Color(0x5aa9ff) },
      uLightDir: { value: sunLight.position.clone().normalize() },
      uStrength: { value: 1.0 }
    },
    vertexShader: ATMO_VERT,
    fragmentShader: ATMO_FRAG,
    side: THREE.BackSide,
    blending: THREE.AdditiveBlending,
    transparent: true,
    depthWrite: false
  });

  atmosphereMesh = new THREE.Mesh(geo, mat);
  scene.add(atmosphereMesh);
  return atmosphereMesh;
}

function buildGrid() {
  gridHelper = new THREE.Group();

  const g1 = new THREE.SphereGeometry(EARTH_RADIUS * 1.002, 48, 24);
  const m1 = new THREE.MeshBasicMaterial({
    color: 0x3f8ee0, wireframe: true, transparent: true,
    opacity: 0.13, depthWrite: false
  });
  gridHelper.add(new THREE.Mesh(g1, m1));

  const ringGeo = new THREE.RingGeometry(EARTH_RADIUS*1.006, EARTH_RADIUS*1.008, 192);
  const ringMat = new THREE.MeshBasicMaterial({
    color: 0x6ef2c0, transparent: true, opacity: 0.24,
    side: THREE.DoubleSide, depthWrite: false
  });
  const eq = new THREE.Mesh(ringGeo, ringMat);
  eq.rotation.x = Math.PI/2;
  gridHelper.add(eq);

  gridHelper.visible = false;
  scene.add(gridHelper);
  return gridHelper;
}

function buildMoon() {
  moonPivot = new THREE.Group();
  moonPivot.rotation.z = THREE.MathUtils.degToRad(5.1);
  scene.add(moonPivot);

  const moonTex = new THREE.CanvasTexture(
    buildMoonMap(QUALITY.MOON_W, QUALITY.MOON_H)
  );
  moonTex.encoding = THREE.sRGBEncoding;
  moonTex.wrapS = THREE.RepeatWrapping;
  moonTex.anisotropy = QUALITY.ANISOTROPY;

  const geo = new THREE.SphereGeometry(
    0.2725,
    QUALITY.MOON_SEG_W, QUALITY.MOON_SEG_H
  );
  const mat = new THREE.MeshPhongMaterial({
    map: moonTex,
    shininess: 3,
    specular: 0x111111,
    bumpMap: moonTex,
    bumpScale: 0.018
  });

  moonMesh = new THREE.Mesh(geo, mat);
  moonMesh.position.set(4.6, 0, 0);
  moonPivot.add(moonMesh);
  return moonMesh;
}

/* ================================================================
   5) إنشاء الأرض
   ================================================================ */
async function createEarth(onProgress) {
  const W = QUALITY.EARTH_W, H = QUALITY.EARTH_H;

  const maps = await buildEarthMaps(W, H, (p) => {
    if (onProgress) onProgress(p*0.60, "رسم القارات والمحيطات بدقة عالية…");
  });

  const maxAniso = Math.min(
    QUALITY.ANISOTROPY,
    renderer.capabilities.getMaxAnisotropy()
  );

  const colorTex = new THREE.CanvasTexture(maps.colorCv);
  colorTex.encoding = THREE.sRGBEncoding;
  colorTex.wrapS = THREE.RepeatWrapping;
  colorTex.anisotropy = maxAniso;
  colorTex.minFilter = THREE.LinearMipMapLinearFilter;
  colorTex.magFilter = THREE.LinearFilter;
  colorTex.generateMipmaps = true;

  const bumpTex = new THREE.CanvasTexture(maps.heightCv);
  bumpTex.wrapS = THREE.RepeatWrapping;
  bumpTex.anisotropy = maxAniso;
  bumpTex.minFilter = THREE.LinearMipMapLinearFilter;
  bumpTex.magFilter = THREE.LinearFilter;

  const specTex = new THREE.CanvasTexture(maps.specCv);
  specTex.wrapS = THREE.RepeatWrapping;
  specTex.anisotropy = maxAniso;

  const cloudCv = await buildCloudMap(QUALITY.CLOUD_W, QUALITY.CLOUD_H, (p) => {
    if (onProgress) onProgress(0.60 + p*0.22, "تكوين السحاب بدقة عالية…");
  });
  const cloudTex = new THREE.CanvasTexture(cloudCv);
  cloudTex.encoding = THREE.sRGBEncoding;
  cloudTex.wrapS = THREE.RepeatWrapping;
  cloudTex.anisotropy = maxAniso;
  cloudTex.minFilter = THREE.LinearMipMapLinearFilter;
  cloudTex.magFilter = THREE.LinearFilter;

  if (onProgress) onProgress(0.84, "تجميع الكوكب…");

  earthGroup = new THREE.Group();
  earthGroup.rotation.z = THREE.MathUtils.degToRad(23.44);
  scene.add(earthGroup);

  /* جسم الأرض — شرائح أعلى بكثير */
  const earthGeo = new THREE.SphereGeometry(
    EARTH_RADIUS,
    QUALITY.EARTH_SEG_W, QUALITY.EARTH_SEG_H
  );
  const earthMat = new THREE.MeshPhongMaterial({
    map: colorTex,
    bumpMap: bumpTex,
    bumpScale: 0.028,
    specularMap: specTex,
    specular: new THREE.Color(0x9fc3ff),
    shininess: 55
  });
  earthMesh = new THREE.Mesh(earthGeo, earthMat);
  earthGroup.add(earthMesh);

  /* طبقة السحاب — شرائح أعلى */
  const cloudGeo = new THREE.SphereGeometry(
    EARTH_RADIUS * 1.008,
    QUALITY.CLOUD_SEG_W, QUALITY.CLOUD_SEG_H
  );
  const cloudMat = new THREE.MeshPhongMaterial({
    map: cloudTex,
    transparent: true,
    opacity: 0.88,
    depthWrite: false,
    shininess: 0,
    specular: 0x000000
  });
  cloudMesh = new THREE.Mesh(cloudGeo, cloudMat);
  earthGroup.add(cloudMesh);

  buildAtmosphere();
  buildGrid();
  buildMoon();
  buildStars();
  buildSunSprite();

  if (onProgress) onProgress(0.94, "تجهيز الإضاءة…");
  await sleep(60);
  if (onProgress) onProgress(1.0, "جاهز!");
  await sleep(280);
}

/* ================================================================
   6) التحكم بالكاميرا
   ================================================================ */
function setupControls() {
  const el = renderer.domElement;

  el.addEventListener("pointerdown", (e) => {
    pointers.set(e.pointerId, { x: e.clientX, y: e.clientY });
    try { el.setPointerCapture(e.pointerId); } catch(_) {}
    cam.dragging = true;
    cam.vTheta = 0; cam.vPhi = 0;
    if (pointers.size === 2) cam.lastPinch = 0;
  });

  el.addEventListener("pointermove", (e) => {
    if (!pointers.has(e.pointerId)) return;
    const prev = pointers.get(e.pointerId);
    const dx = e.clientX - prev.x;
    const dy = e.clientY - prev.y;
    pointers.set(e.pointerId, { x: e.clientX, y: e.clientY });

    if (pointers.size === 1) {
      const k = 0.0052;
      cam.tTheta -= dx*k;
      cam.tPhi   -= dy*k;
      cam.tPhi = clamp(cam.tPhi, 0.14, Math.PI-0.14);
      cam.vTheta = -dx*0.0016;
      cam.vPhi   = -dy*0.0016;
    } else if (pointers.size === 2) {
      const pts = Array.from(pointers.values());
      const d = Math.hypot(pts[0].x-pts[1].x, pts[0].y-pts[1].y);
      if (cam.lastPinch > 0 && d > 0) {
        cam.tRadius = clamp(cam.tRadius*(cam.lastPinch/d), 1.5, 14);
      }
      cam.lastPinch = d;
    }
  });

  const endPointer = (e) => {
    pointers.delete(e.pointerId);
    if (pointers.size === 0) cam.dragging = false;
    if (pointers.size < 2) cam.lastPinch = 0;
  };
  el.addEventListener("pointerup", endPointer);
  el.addEventListener("pointercancel", endPointer);
  el.addEventListener("pointerleave", endPointer);

  el.addEventListener("wheel", (e) => {
    e.preventDefault();
    const f = 1 + clamp(e.deltaY, -120, 120)*0.0013;
    cam.tRadius = clamp(cam.tRadius*f, 1.5, 14);
  }, { passive: false });

  el.addEventListener("dblclick", () => {
    resetCamera();
    toast("تم إعادة ضبط الكاميرا");
  });

  el.addEventListener("contextmenu", (e) => e.preventDefault());
}

function resetCamera() {
  cam.tTheta = 0.75;
  cam.tPhi = 1.32;
  cam.tRadius = 3.55;
  cam.vTheta = 0; cam.vPhi = 0;
}

/* ================================================================
   7) ربط الواجهة
   ================================================================ */
function setupUI() {
  const bind = (id, valId, fmt, apply) => {
    const input = $("#" + id);
    const label = valId ? $("#" + valId) : null;
    const update = () => {
      const v = parseFloat(input.value);
      if (label) label.textContent = fmt ? fmt(v) : v.toFixed(1);
      if (apply) apply(v);
    };
    input.addEventListener("input", update);
    update();
    return input;
  };

  bind("spin", "vSpin", (v)=>v.toFixed(1), (v)=>{ motion.spin = v; });
  bind("cloud", "vCloud", (v)=>v.toFixed(1), (v)=>{ motion.cloud = v; });
  bind("auto", "vAuto", (v)=>v.toFixed(1), (v)=>{ motion.auto = v; });
  bind("moonSpeed", "vMoon", (v)=>v.toFixed(1), (v)=>{ motion.moon = v; });

  bind("light", "vLight", (v)=>v.toFixed(1), (v)=>{
    sunLight.intensity = v;
    if (sunSprite) sunSprite.material.opacity = clamp(v/3.2, 0.25, 0.95);
  });

  bind("ambient", "vAmb", (v)=>v.toFixed(2), (v)=>{
    ambientLight.intensity = v;
    hemiLight.intensity = v*1.15;
  });

  bind("shine", "vShine", (v)=>v.toFixed(0), (v)=>{
    if (earthMesh) earthMesh.material.shininess = v;
  });

  bind("glow", "vGlow", (v)=>v.toFixed(2), (v)=>{
    if (atmosphereMesh) atmosphereMesh.material.uniforms.uStrength.value = v;
  });

  bind("bump", "vBump", (v)=>v.toFixed(3), (v)=>{
    if (earthMesh) earthMesh.material.bumpScale = v;
  });

  const toggles = [
    ["tAtmo",   (on)=>{ if (atmosphereMesh) atmosphereMesh.visible = on; }],
    ["tClouds", (on)=>{ if (cloudMesh) cloudMesh.visible = on; }],
    ["tStars",  (on)=>{ if (starField) starField.visible = on; }],
    ["tMoon",   (on)=>{ if (moonPivot) moonPivot.visible = on; }],
    ["tSun",    (on)=>{ if (sunSprite) sunSprite.visible = on; }],
    ["tGrid",   (on)=>{ if (gridHelper) gridHelper.visible = on; }]
  ];
  toggles.forEach(([id, fn]) => {
    const el = $("#" + id);
    el.addEventListener("change", () => fn(el.checked));
    fn(el.checked);
  });

  $("#btnReset").addEventListener("click", () => {
    resetCamera();
    toast("تم إعادة ضبط الكاميرا");
  });

  $("#btnRandom").addEventListener("click", async () => {
    toast("جارٍ توليد كوكب جديد بدقة عالية…");
    await regeneratePlanet();
  });

  $("#btnShot").addEventListener("click", () => {
    try {
      renderer.render(scene, camera);
      const url = renderer.domElement.toDataURL("image/png");
      const a = document.createElement("a");
      a.href = url;
      a.download = "earth-3d-hd-" + Date.now() + ".png";
      a.click();
      toast("تم حفظ الصورة ✔");
    } catch (err) {
      toast("تعذّر حفظ الصورة");
    }
  });

  $("#btnFull").addEventListener("click", () => {
    const el = document.documentElement;
    if (!document.fullscreenElement) {
      (el.requestFullscreen || el.webkitRequestFullscreen || el.msRequestFullscreen)
        .call(el).catch(() => toast("ملء الشاشة غير مدعوم"));
    } else {
      document.exitFullscreen();
    }
  });

  const panel = $("#panel");
  const toggleBtn = $("#panelToggle");

  $("#collapseBtn").addEventListener("click", () => {
    panel.classList.add("collapsed");
    toggleBtn.classList.add("show");
  });

  toggleBtn.addEventListener("click", () => {
    panel.classList.remove("collapsed");
    toggleBtn.classList.remove("show");
  });

  setTimeout(() => {
    const h = $("#hint");
    if (h) h.classList.add("fade");
  }, 9000);

  renderer.domElement.addEventListener("pointerdown", () => {
    const h = $("#hint");
    if (h) h.classList.add("fade");
  }, { once: true });
}

/* ================================================================
   8) توليد كوكب جديد
   ================================================================ */
async function regeneratePlanet() {
  const btn = $("#btnRandom");
  btn.disabled = true;

  planetCfg.seed = Math.random()*500;
  planetCfg.seaLevel = rand(0.02, 0.16);
  planetCfg.landScale = rand(1.05, 1.85);
  planetCfg.roughness = rand(0.85, 1.25);
  planetCfg.iceEdge = rand(0.66, 0.82);
  planetCfg.cloudCover = rand(0.44, 0.58);

  const maps = await buildEarthMaps(QUALITY.EARTH_W, QUALITY.EARTH_H, null);
  const cloudCv = await buildCloudMap(QUALITY.CLOUD_W, QUALITY.CLOUD_H, null);

  const maxAniso = Math.min(
    QUALITY.ANISOTROPY,
    renderer.capabilities.getMaxAnisotropy()
  );

  const newColor = new THREE.CanvasTexture(maps.colorCv);
  newColor.encoding = THREE.sRGBEncoding;
  newColor.wrapS = THREE.RepeatWrapping;
  newColor.anisotropy = maxAniso;

  const newBump = new THREE.CanvasTexture(maps.heightCv);
  newBump.wrapS = THREE.RepeatWrapping;
  newBump.anisotropy = maxAniso;

  const newSpec = new THREE.CanvasTexture(maps.specCv);
  newSpec.wrapS = THREE.RepeatWrapping;

  const newCloud = new THREE.CanvasTexture(cloudCv);
  newCloud.encoding = THREE.sRGBEncoding;
  newCloud.wrapS = THREE.RepeatWrapping;
  newCloud.anisotropy = maxAniso;

  const old = earthMesh.material;
  if (old.map) old.map.dispose();
  if (old.bumpMap) old.bumpMap.dispose();
  if (old.specularMap) old.specularMap.dispose();

  earthMesh.material.map = newColor;
  earthMesh.material.bumpMap = newBump;
  earthMesh.material.specularMap = newSpec;
  earthMesh.material.needsUpdate = true;

  if (cloudMesh.material.map) cloudMesh.material.map.dispose();
  cloudMesh.material.map = newCloud;
  cloudMesh.material.needsUpdate = true;

  btn.disabled = false;
  toast("تم توليد كوكب جديد ✔");
}

/* ================================================================
   9) حلقة الرسم
   ================================================================ */
let clock;
let fpsFrames = 0, fpsTimer = 0;

function animate() {
  requestAnimationFrame(animate);

  const dt = Math.min(clock.getDelta(), 0.1);

  if (!cam.dragging) {
    if (Math.abs(cam.vTheta) > 0.00002 || Math.abs(cam.vPhi) > 0.00002) {
      cam.tTheta += cam.vTheta;
      cam.tPhi   += cam.vPhi;
      cam.tPhi = clamp(cam.tPhi, 0.14, Math.PI-0.14);
      cam.vTheta *= 0.935;
      cam.vPhi   *= 0.935;
    } else {
      cam.vTheta = 0; cam.vPhi = 0;
    }

    if (motion.auto > 0) {
      cam.tTheta += motion.auto * 0.00075 * (60*dt);
    }
  }

  const ease = 1 - Math.pow(0.0008, dt);
  cam.theta  = lerp(cam.theta,  cam.tTheta,  ease);
  cam.phi    = lerp(cam.phi,    cam.tPhi,    ease);
  cam.radius = lerp(cam.radius, cam.tRadius, ease);

  const sp = new THREE.Vector3().setFromSphericalCoords(cam.radius, cam.phi, cam.theta);
  camera.position.copy(sp);
  camera.lookAt(0, 0, 0);

  if (earthMesh) {
    earthMesh.rotation.y += 0.0016 * motion.spin * (60*dt);
  }
  if (cloudMesh) {
    cloudMesh.rotation.y += 0.0016 * motion.spin * (60*dt);
    cloudMesh.rotation.y += 0.00035 * motion.cloud * (60*dt);
  }
  if (gridHelper && gridHelper.visible && earthMesh) {
    gridHelper.rotation.y = earthMesh.rotation.y;
  }

  if (moonPivot && moonPivot.visible) {
    moonPivot.rotation.y += 0.00055 * motion.moon * (60*dt);
    if (moonMesh) moonMesh.rotation.y += 0.0004 * (60*dt);
  }

  if (starField && starField.visible) {
    starField.rotation.y += 0.000012 * (60*dt);
  }

  if (atmosphereMesh) {
    atmosphereMesh.material.uniforms.uLightDir.value
      .copy(sunLight.position).normalize();
  }

  renderer.render(scene, camera);

  fpsFrames++;
  fpsTimer += dt;
  if (fpsTimer >= 0.5) {
    const fps = Math.round(fpsFrames / fpsTimer);
    $("#fps").textContent = fps;
    $("#dist").textContent = cam.radius.toFixed(1);
    fpsFrames = 0;
    fpsTimer = 0;
  }
}

/* ================================================================
   10) تغيير حجم النافذة
   ================================================================ */
function onResize() {
  if (!renderer || !camera) return;
  const w = window.innerWidth, h = window.innerHeight;
  camera.aspect = w/h;
  camera.updateProjectionMatrix();
  renderer.setPixelRatio(Math.min(window.devicePixelRatio || 1, QUALITY.MAX_PIXEL_RATIO));
  renderer.setSize(w, h);
}

/* ================================================================
   11) شاشة التحميل
   ================================================================ */
function setLoading(p, status) {
  const pct = Math.round(clamp(p, 0, 1) * 100);
  $("#loadBar").style.width = pct + "%";
  $("#loadPct").textContent = pct + "%";
  if (status) $("#loadStatus").textContent = status;
}

/* ================================================================
   12) نقطة البداية
   ================================================================ */
async function init() {
  try {
    const testCanvas = document.createElement("canvas");
    const gl = testCanvas.getContext("webgl") || testCanvas.getContext("experimental-webgl");
    if (!gl) {
      $("#loadStatus").textContent = "متصفحك لا يدعم WebGL — الرجاء استخدام متصفح حديث.";
      return;
    }

    setLoading(0.03, "تهيئة محرك الرسم…");
    await nextFrame();

    setupRenderer();
    setupScene();
    setupControls();

    setLoading(0.08, "توليد تضاريس الكوكب بدقة عالية… (قد يستغرق بضع ثوانٍ)");
    await nextFrame();

    await createEarth((p, status) => setLoading(0.08 + p*0.88, status));

    setupUI();
    clock = new THREE.Clock();

    setLoading(1, "جاهز!");
    await sleep(420);
    $("#loader").classList.add("hidden");

    animate();

    setTimeout(() => toast("مرحباً بك في الأرض بدقة عالية 🌍"), 900);

  } catch (err) {
    console.error(err);
    $("#loadStatus").textContent = "حدث خطأ: " + (err && err.message ? err.message : err);
    $("#loadPct").textContent = "!";
  }
}

window.addEventListener("resize", onResize);
window.addEventListener("orientationchange", () => setTimeout(onResize, 220));

window.addEventListener("keydown", (e) => {
  switch (e.key) {
    case "r": case "R": resetCamera(); break;
    case "h": case "H": {
      const panel = $("#panel");
      const tb = $("#panelToggle");
      if (panel.classList.contains("collapsed")) {
        panel.classList.remove("collapsed");
        tb.classList.remove("show");
      } else {
        panel.classList.add("collapsed");
        tb.classList.add("show");
      }
      break;
    }
    case " ": {
      e.preventDefault();
      const spinEl = $("#spin");
      spinEl.value = spinEl.value > 0 ? "0" : "1";
      spinEl.dispatchEvent(new Event("input"));
      break;
    }
  }
});

init();
</script>
</body>
</html>