<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Evaporation and Transpiration</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    html, body {
      width: 100%;
      height: 100%;
      background: transparent;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      overflow-x: hidden;
    }
    .main-layout {
      display: flex;
      flex-direction: column;
      width: 100%;
      height: 100%;
      max-height: 600px;
      padding: 8px;
      gap: 8px;
    }
    .cards-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 10px;
      flex: 1;
      min-height: 0;
    }
    .process-card {
      position: relative;
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      border: 1px solid #cbd5e1;
      background: #f0f9ff;
    }
    .card-label-box {
      position: absolute;
      top: 6px;
      left: 6px;
      right: 6px;
      z-index: 10;
      background: rgba(255, 255, 255, 0.94);
      backdrop-filter: blur(4px);
      padding: 4px 8px;
      border-radius: 8px;
      border: 1px solid rgba(226, 232, 240, 0.9);
      box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
      text-align: center;
      pointer-events: none;
    }
    .process-title {
      font-size: 13px;
      font-weight: 700;
      line-height: 1.2;
    }
    .process-sub {
      font-size: 10.5px;
      font-weight: 600;
      color: #475569;
      margin-top: 1px;
    }
    .ocean-title { color: #0369a1; }
    .tree-title { color: #15803d; }

    .scene-svg {
      width: 100%;
      height: 100%;
      display: block;
    }

    .banner {
      background: #ffffff;
      border: 1.5px solid #93c5fd;
      border-radius: 10px;
      padding: 6px 10px;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      box-shadow: 0 2px 5px rgba(2, 132, 199, 0.08);
      flex-shrink: 0;
    }
    .banner-text {
      font-size: 12px;
      font-weight: 700;
      color: #0369a1;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      flex-wrap: wrap;
    }
    .banner-pill {
      background: #e0f2fe;
      color: #0284c7;
      padding: 2px 8px;
      border-radius: 12px;
      font-size: 11px;
      font-weight: 700;
      border: 1px solid #bae6fd;
    }

    /* Calming loop animations */
    @keyframes riseVapor {
      0% {
        transform: translateY(0) scale(0.9);
        opacity: 0;
      }
      20% {
        opacity: 1;
      }
      80% {
        opacity: 1;
      }
      100% {
        transform: translateY(-38px) scale(1.15);
        opacity: 0;
      }
    }

    @keyframes pulseSun {
      0%, 100% { transform: scale(1); opacity: 0.95; }
      50% { transform: scale(1.08); opacity: 1; }
    }

    @keyframes dashFlow {
      to {
        stroke-dashoffset: -24;
      }
    }

    .vapor-p1 { animation: riseVapor 3s infinite ease-in-out; }
    .vapor-p2 { animation: riseVapor 3s infinite ease-in-out 1s; }
    .vapor-p3 { animation: riseVapor 3s infinite ease-in-out 2s; }

    .sun-glow {
      transform-origin: 160px 65px;
      animation: pulseSun 4s infinite ease-in-out;
    }

    .flow-arrow {
      stroke-dasharray: 6 4;
      animation: dashFlow 1.8s linear infinite;
    }

    /* Responsive adjustments for mobile widths */
    @media (max-width: 500px) {
      .main-layout {
        max-height: none;
        height: auto;
      }
      .cards-row {
        grid-template-columns: 1fr;
        gap: 8px;
      }
      .process-card {
        height: 230px;
      }
      .banner {
        padding: 6px 8px;
      }
      .banner-text {
        font-size: 11px;
        gap: 4px;
      }
    }
  </style>
</head>
<body>

  <div class="main-layout">
    <div class="cards-row">

      
      <div class="process-card">
        <div class="card-label-box">
          <div class="process-title ocean-title">Evaporation</div>
          <div class="process-sub">Hydrosphere → Atmosphere</div>
        </div>

        <svg class="scene-svg" viewBox="0 0 200 240" preserveAspectRatio="xMidYMid meet">
          <defs>
            <linearGradient id="skyGrad1" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#bae6fd"/>
              <stop offset="60%" stop-color="#e0f2fe"/>
              <stop offset="100%" stop-color="#f0f9ff"/>
            </linearGradient>
            <linearGradient id="seaGrad" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#0284c7"/>
              <stop offset="35%" stop-color="#0369a1"/>
              <stop offset="100%" stop-color="#075985"/>
            </linearGradient>
          </defs>

          
          <rect width="200" height="240" fill="url(#skyGrad1)" />

          
          <g class="sun-glow">
            <circle cx="160" cy="65" r="24" fill="#fef08a" opacity="0.45" />
            <circle cx="160" cy="65" r="17" fill="#fde047" opacity="0.85" />
            <circle cx="160" cy="65" r="11" fill="#eab308" />
          </g>

          
          <path d="M0,170 C35,165 65,175 100,170 C135,165 165,175 200,170 L200,240 L0,240 Z" fill="url(#seaGrad)" />
          <path d="M0,182 C40,177 70,187 110,182 C150,177 170,187 200,182 L200,240 L0,240 Z" fill="#0369a1" opacity="0.6" />

          
          <g fill="none" stroke="#0369a1" stroke-width="2.8" stroke-linecap="round" stroke-linejoin="round">
            
            <g class="vapor-p1">
              <path d="M 45 160 C 40 142, 50 128, 45 108" />
              <polyline points="39,116 45,108 51,116" />
              <circle cx="45" cy="96" r="3.5" fill="#0284c7" stroke="#0369a1" stroke-width="1" />
            </g>

            
            <g class="vapor-p2">
              <path d="M 100 160 C 95 142, 105 128, 100 108" />
              <polyline points="94,116 100,108 106,116" />
              <circle cx="100" cy="96" r="3.5" fill="#0284c7" stroke="#0369a1" stroke-width="1" />
            </g>

            
            <g class="vapor-p3">
              <path d="M 155 160 C 150 142, 160 128, 155 108" />
              <polyline points="149,116 155,108 161,116" />
              <circle cx="155" cy="96" r="3.5" fill="#0284c7" stroke="#0369a1" stroke-width="1" />
            </g>
          </g>
        </svg>
      </div>

      
      <div class="process-card">
        <div class="card-label-box">
          <div class="process-title tree-title">Transpiration</div>
          <div class="process-sub">Biosphere → Atmosphere</div>
        </div>

        <svg class="scene-svg" viewBox="0 0 200 240" preserveAspectRatio="xMidYMid meet">
          <defs>
            <linearGradient id="skyGrad2" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#bae6fd"/>
              <stop offset="60%" stop-color="#e0f2fe"/>
              <stop offset="100%" stop-color="#f0fdf4"/>
            </linearGradient>
            <linearGradient id="soilGrad" x1="0" y1="0" x2="0" y2="1">
              <stop offset="0%" stop-color="#a16207"/>
              <stop offset="30%" stop-color="#78350f"/>
              <stop offset="100%" stop-color="#451a03"/>
            </linearGradient>
          </defs>

          
          <rect width="200" height="240" fill="url(#skyGrad2)" />

          
          <rect y="185" width="200" height="55" fill="url(#soilGrad)" />
          <path d="M0,185 Q50,183 100,185 T200,185" fill="none" stroke="#22c55e" stroke-width="4" />

          
          <g stroke="#92400e" stroke-width="3" stroke-linecap="round" fill="none">
            <path d="M100,185 Q90,205 70,225" />
            <path d="M100,185 Q105,210 105,232" />
            <path d="M100,185 Q115,205 135,225" />
            <path d="M85,200 Q70,210 60,215" stroke-width="1.8" />
            <path d="M110,200 Q125,210 142,215" stroke-width="1.8" />
          </g>

          
          <path d="M92,185 L94,130 Q85,120 70,110 M94,130 L100,105 M106,185 L104,130 Q115,120 130,110" 
                stroke="#78350f" stroke-width="8" stroke-linecap="round" stroke-linejoin="round" fill="none" />

          
          <g fill="#22c55e">
            <circle cx="100" cy="92" r="32" />
            <circle cx="75" cy="102" r="24" fill="#16a34a" />
            <circle cx="125" cy="102" r="24" fill="#15803d" />
            <circle cx="100" cy="74" r="22" fill="#4ade80" />
            <circle cx="82" cy="80" r="18" fill="#22c55e" />
            <circle cx="118" cy="80" r="18" fill="#16a34a" />
          </g>

          
          <g fill="none" stroke="#0284c7" stroke-width="2.5" stroke-linecap="round" class="flow-arrow">
            <path d="M72,223 Q90,203 98,185 L98,125 Q90,115 78,108" />
            <path d="M133,223 Q112,203 102,185 L102,125 Q110,115 122,108" />
          </g>

          
          <g fill="none" stroke="#0369a1" stroke-width="2.5" stroke-linecap="round">
            
            <g class="vapor-p1">
              <path d="M 68 85 C 64 72, 70 62, 66 50" />
              <polyline points="62,56 66,50 71,56" />
              <circle cx="66" cy="42" r="3" fill="#0284c7" stroke="#0369a1" stroke-width="0.8" />
            </g>

            
            <g class="vapor-p2">
              <path d="M 100 65 C 96 52, 104 42, 100 30" />
              <polyline points="95,36 100,30 105,36" />
              <circle cx="100" cy="22" r="3" fill="#0284c7" stroke="#0369a1" stroke-width="0.8" />
            </g>

            
            <g class="vapor-p3">
              <path d="M 132 85 C 128 72, 136 62, 132 50" />
              <polyline points="127,56 132,50 137,56" />
              <circle cx="132" cy="42" r="3" fill="#0284c7" stroke="#0369a1" stroke-width="0.8" />
            </g>
          </g>
        </svg>
      </div>

    </div>

    
    <div class="banner">
      <div class="banner-text">
        <span>Evaporation</span>
        <span>+</span>
        <span>Transpiration</span>
        <span>=</span>
        <span class="banner-pill">Total Evapotranspiration</span>
      </div>
    </div>
  </div>

</body>
</html>

How Water Cycles Through Earth's Systems

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <script src="{{VENDOR_CDN}}/gsap.min.js"></script>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }
    body {
      width: 100%;
      height: 100%;
      background: #f0f9ff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
      color: #1e2945;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      padding: 12px;
      user-select: none;
    }
    .stepper {
      display: flex;
      gap: 6px;
      width: 100%;
      max-width: 480px;
      justify-content: center;
    }
    .step-btn {
      flex: 1;
      padding: 6px 4px;
      background: #ffffff;
      border: 1px solid #bae6fd;
      border-radius: 8px;
      font-size: 13px;
      font-weight: 600;
      color: #0284c7;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 4px;
      transition: background 0.2s, box-shadow 0.2s, color 0.2s;
    }
    .step-btn.active {
      background: #0284c7;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.35);
    }
    .stage-container {
      position: relative;
      width: 100%;
      max-width: 480px;
      height: 250px;
      background: #ffffff;
      border: 1px solid #bae6fd;
      border-radius: 12px;
      overflow: hidden;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .scene {
      position: absolute;
      inset: 0;
      opacity: 0;
      pointer-events: none;
      transition: opacity 0.4s ease;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
    }
    .scene.active {
      opacity: 1;
      pointer-events: auto;
    }

    /* Scene 1: Vapor */
    .vapor-box {
      position: relative;
      width: 100%;
      height: 100%;
    }
    .molecule {
      position: absolute;
      width: 12px;
      height: 12px;
      background: #38bdf8;
      border: 2px solid #0284c7;
      border-radius: 50%;
      box-shadow: 0 0 6px rgba(56, 189, 248, 0.6);
    }
    .arrow-up {
      position: absolute;
      bottom: 12px;
      font-size: 20px;
      color: #0284c7;
      opacity: 0.6;
      animation: rise 2s infinite ease-in-out;
    }
    @keyframes rise {
      0% { transform: translateY(0); opacity: 0.2; }
      50% { opacity: 0.8; }
      100% { transform: translateY(-30px); opacity: 0; }
    }

    /* Scene 2: Altitude & Cooling */
    .alt-meter {
      display: flex;
      align-items: center;
      gap: 20px;
      height: 80%;
      width: 80%;
      justify-content: center;
    }
    .temp-bar-wrap {
      height: 160px;
      width: 18px;
      background: #e2e8f0;
      border-radius: 10px;
      position: relative;
      overflow: hidden;
      display: flex;
      flex-direction: column;
      justify-content: flex-end;
    }
    .temp-fill {
      width: 100%;
      height: 30%;
      background: linear-gradient(to top, #3b82f6, #60a5fa);
      border-radius: 10px;
      transition: height 0.5s ease;
    }
    .temp-markers {
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      height: 160px;
      font-size: 14px;
      font-weight: 700;
    }
    .temp-top { color: #2563eb; }
    .temp-bot { color: #ea580c; }
    .alt-arrow {
      display: flex;
      flex-direction: column;
      align-items: center;
      font-size: 12px;
      font-weight: 600;
      color: #64748b;
    }
    .alt-arrow span { font-size: 28px; color: #0284c7; }

    /* Scene 3: Nucleation */
    .droplet-view {
      position: relative;
      width: 180px;
      height: 180px;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .drop-halo {
      position: absolute;
      width: 120px;
      height: 120px;
      background: radial-gradient(circle, rgba(56, 189, 248, 0.4) 0%, rgba(56, 189, 248, 0.1) 70%, transparent 100%);
      border-radius: 50%;
      animation: pulse 2.5s infinite ease-in-out;
    }
    @keyframes pulse {
      0%, 100% { transform: scale(0.95); }
      50% { transform: scale(1.08); }
    }
    .nucleus {
      width: 18px;
      height: 18px;
      background: #64748b;
      border-radius: 50%;
      z-index: 2;
      box-shadow: 0 0 4px rgba(0,0,0,0.3);
    }
    .clustered-mol {
      position: absolute;
      width: 10px;
      height: 10px;
      background: #0284c7;
      border-radius: 50%;
    }

    /* Scene 4: Cloud Aggregation */
    .cloud-stage {
      position: relative;
      width: 100%;
      height: 100%;
      display: flex;
      align-items: center;
      justify-content: center;
    }
    .cloud-svg {
      width: 180px;
      filter: drop-shadow(0 6px 12px rgba(2, 132, 199, 0.2));
    }
    .tiny-drop {
      position: absolute;
      width: 6px;
      height: 6px;
      background: #38bdf8;
      border-radius: 50%;
      opacity: 0.7;
    }

    /* Bottom Label & Controls */
    .bottom-bar {
      display: flex;
      align-items: center;
      justify-content: space-between;
      width: 100%;
      max-width: 480px;
      padding: 0 4px;
    }
    .label-tag {
      font-size: 14px;
      font-weight: 700;
      color: #0369a1;
      background: #e0f2fe;
      padding: 4px 10px;
      border-radius: 6px;
    }
    .play-btn {
      background: #0284c7;
      color: #ffffff;
      border: none;
      border-radius: 6px;
      padding: 6px 12px;
      font-size: 13px;
      font-weight: 600;
      cursor: pointer;
    }
  </style>
</head>
<body>

  <div class="stepper">
    <button class="step-btn active" onclick="setStep(0)">1. Vapor</button>
    <button class="step-btn" onclick="setStep(1)">2. Cooling</button>
    <button class="step-btn" onclick="setStep(2)">3. Nucleus</button>
    <button class="step-btn" onclick="setStep(3)">4. Cloud</button>
  </div>

  <div class="stage-container">
    
    <div class="scene active" id="scene0">
      <div class="vapor-box">
        <div class="molecule" style="top:25%; left:20%;"></div>
        <div class="molecule" style="top:35%; left:65%;"></div>
        <div class="molecule" style="top:60%; left:30%;"></div>
        <div class="molecule" style="top:70%; left:75%;"></div>
        <div class="molecule" style="top:45%; left:45%;"></div>
        <div class="molecule" style="top:20%; left:80%;"></div>
        <div class="arrow-up" style="left:28%;">↑</div>
        <div class="arrow-up" style="left:50%; animation-delay: 0.6s;">↑</div>
        <div class="arrow-up" style="left:72%; animation-delay: 1.2s;">↑</div>
      </div>
    </div>

    
    <div class="scene" id="scene1">
      <div class="alt-meter">
        <div class="alt-arrow">
          <span>↑</span>
          Altitude
        </div>
        <div class="temp-bar-wrap">
          <div class="temp-fill"></div>
        </div>
        <div class="temp-markers">
          <div class="temp-top">-5°C</div>
          <div class="temp-bot">+20°C</div>
        </div>
      </div>
    </div>

    
    <div class="scene" id="scene2">
      <div class="droplet-view">
        <div class="drop-halo"></div>
        <div class="nucleus"></div>
        
        <div class="clustered-mol" style="top:70px; left:86px;"></div>
        <div class="clustered-mol" style="top:100px; left:86px;"></div>
        <div class="clustered-mol" style="top:85px; left:70px;"></div>
        <div class="clustered-mol" style="top:85px; left:102px;"></div>
        <div class="clustered-mol" style="top:74px; left:74px;"></div>
        <div class="clustered-mol" style="top:74px; left:98px;"></div>
        <div class="clustered-mol" style="top:96px; left:74px;"></div>
        <div class="clustered-mol" style="top:96px; left:98px;"></div>
      </div>
    </div>

    
    <div class="scene" id="scene3">
      <div class="cloud-stage">
        <svg class="cloud-svg" viewBox="0 0 100 60">
          <path d="M 20 45 A 15 15 0 0 1 35 25 A 20 20 0 0 1 70 25 A 15 15 0 0 1 85 45 Z" fill="#e0f2fe" stroke="#38bdf8" stroke-width="2" />
        </svg>
        <div class="tiny-drop" style="top:32%; left:34%;"></div>
        <div class="tiny-drop" style="top:40%; left:50%;"></div>
        <div class="tiny-drop" style="top:36%; left:62%;"></div>
        <div class="tiny-drop" style="top:52%; left:42%;"></div>
        <div class="tiny-drop" style="top:48%; left:56%;"></div>
      </div>
    </div>
  </div>

  <div class="bottom-bar">
    <div class="label-tag" id="statusLabel">Water Vapor (Gas)</div>
    <button class="play-btn" id="playBtn" onclick="togglePlay()">⏸ Pause</button>
  </div>

  <script>
    let current = 0;
    let playing = true;
    let timer = null;

    const labels = [
      "Water Vapor (Gas)",
      "Cooling Altitude",
      "Nucleation Droplet",
      "Cloud Formation"
    ];

    function setStep(idx) {
      current = idx;
      document.querySelectorAll('.step-btn').forEach((btn, i) => {
        btn.classList.toggle('active', i === idx);
      });
      document.querySelectorAll('.scene').forEach((sc, i) => {
        sc.classList.toggle('active', i === idx);
      });
      document.getElementById('statusLabel').textContent = labels[idx];
    }

    function nextStep() {
      current = (current + 1) % 4;
      setStep(current);
    }

    function togglePlay() {
      playing = !playing;
      document.getElementById('playBtn').textContent = playing ? "⏸ Pause" : "▶ Play";
      if (playing) {
        startTimer();
      } else {
        clearInterval(timer);
      }
    }

    function startTimer() {
      clearInterval(timer);
      timer = setInterval(() => {
        if (playing) nextStep();
      }, 3000);
    }

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

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="aspect-ratio" content="4:3">
  <style>
    * { box-sizing: border-box; margin: 0; padding: 0; }
    body {
      width: 100%;
      height: 100%;
      background: #f8fafc;
      font-family: system-ui, -apple-system, sans-serif;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: space-between;
      user-select: none;
      padding: 8px 6px;
    }

    .toolbar {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: 6px;
      margin-bottom: 6px;
      flex-wrap: wrap;
      width: 100%;
    }

    .btn-step {
      background: #ffffff;
      border: 1px solid #cbd5e1;
      border-radius: 20px;
      padding: 4px 12px;
      font-size: 13px;
      font-weight: 600;
      color: #475569;
      cursor: pointer;
      box-shadow: 0 1px 2px rgba(0,0,0,0.05);
      transition: all 0.25s ease;
    }

    .btn-step.active {
      background: #0284c7;
      border-color: #0284c7;
      color: #ffffff;
      box-shadow: 0 2px 6px rgba(2, 132, 199, 0.35);
    }

    .svg-container {
      width: 100%;
      max-width: 600px;
      flex: 1;
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg {
      width: 100%;
      height: 100%;
      max-height: 440px;
      display: block;
      border-radius: 8px;
      background: #e0f2fe;
    }

    .label-badge {
      font-size: 13px;
      font-weight: 700;
      fill: #1e293b;
    }

    .label-bg {
      fill: rgba(255, 255, 255, 0.92);
      stroke: #cbd5e1;
      stroke-width: 1;
      rx: 5;
    }

    .flow-dash {
      stroke-dasharray: 6 4;
      animation: flowMove 1.5s linear infinite;
    }

    .flow-dash-slow {
      stroke-dasharray: 6 5;
      animation: flowMove 3s linear infinite;
    }

    @keyframes flowMove {
      to {
        stroke-dashoffset: -20;
      }
    }

    .stage-group {
      opacity: 0.28;
      transition: opacity 0.3s ease;
    }

    .stage-group.highlight {
      opacity: 1;
    }

    .rain-drop {
      stroke: #38bdf8;
      stroke-width: 2.5;
      stroke-linecap: round;
      animation: rainFall 1.2s linear infinite;
    }

    @keyframes rainFall {
      0% { transform: translateY(-10px); opacity: 0; }
      50% { opacity: 1; }
      100% { transform: translateY(22px); opacity: 0; }
    }
  </style>
</head>
<body>

  <div class="toolbar" id="toolbar">
    <button class="btn-step active" data-step="0">1. Rain & Runoff</button>
    <button class="btn-step" data-step="1">2. Infiltration</button>
    <button class="btn-step" data-step="2">3. Percolation</button>
    <button class="btn-step" data-step="3">4. Aquifer & Baseflow</button>
    <button class="btn-step" data-step="4">Show All</button>
  </div>

  <div class="svg-container">
    <svg viewBox="0 0 600 420" preserveAspectRatio="xMidYMid meet">
      <defs>
        <marker id="arrow-blue" markerWidth="6" markerHeight="6" refX="4" refY="3" orient="auto">
          <path d="M0,0 L6,3 L0,6 Z" fill="#0284c7" />
        </marker>
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          <path d="M0,0 L6,3 L0,6 Z" fill="#0369a1" />
        </marker>
        <marker id="arrow-soil" markerWidth="6" markerHeight="6" refX="4" refY="3" orient="auto">
          <path d="M0,0 L6,3 L0,6 Z" fill="#0284c7" />
        </marker>
        <pattern id="soilPat" width="16" height="16" patternUnits="userSpaceOnUse">
          <rect width="16" height="16" fill="#a16207"/>
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          <circle cx="9" cy="5" r="0.8" fill="#fef08a" opacity="0.15"/>
        </pattern>
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          <rect width="24" height="24" fill="#78716c"/>
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          <circle cx="5" cy="19" r="1.4" fill="#d6d3d1" opacity="0.25"/>
        </pattern>
        <pattern id="aquiferPat" width="20" height="20" patternUnits="userSpaceOnUse">
          <rect width="20" height="20" fill="#0284c7"/>
          <circle cx="5" cy="5" r="2.2" fill="#38bdf8" opacity="0.35"/>
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          <circle cx="14" cy="4" r="1.5" fill="#bae6fd" opacity="0.3"/>
        </pattern>
      </defs>

      
      
      <rect x="0" y="270" width="600" height="150" fill="url(#aquiferPat)"/>

      
      <polygon points="0,170 410,210 600,210 600,270 0,270" fill="url(#rockPat)"/>

      
      <polygon points="0,95 410,145 420,155 0,170" fill="url(#soilPat)"/>

      
      <polygon points="0,90 410,140 410,145 0,95" fill="#4ade80"/>

      
      <path d="M 405,140 Q 425,140 435,160 Q 455,200 480,200 Q 540,200 600,195 L 600,210 L 410,210 Z" fill="#0284c7"/>
      <path d="M 410,145 Q 430,145 440,165 Q 460,200 485,200 L 600,200 L 600,160 Q 520,165 480,165 Q 440,165 425,142 Z" fill="#38bdf8" opacity="0.85"/>

      
      <line x1="0" y1="270" x2="480" y2="200" stroke="#0369a1" stroke-width="2.5" stroke-dasharray="8 5"/>
      <line x1="480" y1="200" x2="600" y2="200" stroke="#0369a1" stroke-width="2.5" stroke-dasharray="8 5"/>

      
      <g id="stage-0" class="stage-group highlight">
        
        <g class="rain-drop">
          <line x1="50" y1="20" x2="45" y2="35" />
          <line x1="120" y1="15" x2="115" y2="30" />
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          <line x1="260" y1="20" x2="255" y2="35" />
          <line x1="330" y1="40" x2="325" y2="55" />
        </g>
        <g class="rain-drop" style="animation-delay: 0.6s;">
          <line x1="85" y1="25" x2="80" y2="40" />
          <line x1="155" y1="35" x2="150" y2="50" />
          <line x1="225" y1="15" x2="220" y2="30" />
          <line x1="295" y1="45" x2="290" y2="60" />
        </g>

        
        <path d="M 60,78 Q 230,105 405,135" fill="none" stroke="#0284c7" stroke-width="4" stroke-linecap="round" marker-end="url(#arrow-blue)" class="flow-dash"/>

        
        <rect x="180" y="65" width="130" height="24" class="label-bg"/>
        <text x="245" y="82" text-anchor="middle" class="label-badge">Surface Runoff →</text>
      </g>

      
      <g id="stage-1" class="stage-group">
        
        <line x1="80" y1="95" x2="80" y2="150" stroke="#0284c7" stroke-width="3.5" marker-end="url(#arrow-blue)" class="flow-dash"/>
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        <line x1="280" y1="125" x2="280" y2="160" stroke="#0284c7" stroke-width="3.5" marker-end="url(#arrow-blue)" class="flow-dash"/>

        
        <rect x="18" y="125" width="125" height="24" class="label-bg"/>
        <text x="80" y="142" text-anchor="middle" class="label-badge">↓ Infiltration (Soil)</text>
      </g>

      
      <g id="stage-2" class="stage-group">
        
        <line x1="90" y1="170" x2="90" y2="255" stroke="#0284c7" stroke-width="3.5" marker-end="url(#arrow-blue)" class="flow-dash"/>
        <line x1="200" y1="170" x2="200" y2="245" stroke="#0284c7" stroke-width="3.5" marker-end="url(#arrow-blue)" class="flow-dash"/>
        <line x1="310" y1="170" x2="310" y2="225" stroke="#0284c7" stroke-width="3.5" marker-end="url(#arrow-blue)" class="flow-dash"/>

        
        <rect x="18" y="200" width="135" height="24" class="label-bg"/>
        <text x="85" y="217" text-anchor="middle" class="label-badge">↓ Percolation (Rock)</text>

        
        <rect x="360" y="170" width="95" height="22" class="label-bg"/>
        <text x="407" y="186" text-anchor="middle" class="label-badge" fill="#0369a1" style="font-size: 11.5px;">Water Table ---</text>
      </g>

      
      <g id="stage-3" class="stage-group">
        
        <path d="M 60,330 C 220,330 350,300 450,210" fill="none" stroke="#bae6fd" stroke-width="4.5" marker-end="url(#arrow-darkblue)" class="flow-dash-slow"/>
        <path d="M 120,370 C 280,370 380,330 465,225" fill="none" stroke="#bae6fd" stroke-width="4.5" marker-end="url(#arrow-darkblue)" class="flow-dash-slow"/>

        
        <rect x="300" y="295" width="105" height="24" class="label-bg"/>
        <text x="352" y="312" text-anchor="middle" class="label-badge">Baseflow ↗</text>

        
        <rect x="20" y="335" width="165" height="24" class="label-bg"/>
        <text x="102" y="352" text-anchor="middle" class="label-badge">Aquifer / Groundwater</text>
      </g>

      
      <g>
        <rect x="490" y="140" width="55" height="22" class="label-bg"/>
        <text x="517" y="156" text-anchor="middle" class="label-badge">River</text>
      </g>
    </svg>
  </div>

  <script>
    const buttons = document.querySelectorAll('.btn-step');
    const stages = [
      document.getElementById('stage-0'),
      document.getElementById('stage-1'),
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    autoPlayTimer = setInterval(() => {
      let next = (activeStep + 1) % 5;
      setStep(next);
    }, 3500);
  </script>
</body>
</html>

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Water in Earth's Systems</title>
  <style>
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      -webkit-tap-highlight-color: transparent;
    }

    body {
      width: 100%;
      background: #ffffff;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
      color: #1e293b;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: flex-start;
      padding: 10px 12px 14px;
      user-select: none;
      min-height: auto;
    }

    .header-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
      max-width: 440px;
      margin-bottom: 6px;
    }

    .title-group {
      display: flex;
      flex-direction: column;
      gap: 2px;
    }

    .title {
      font-size: 15.5px;
      font-weight: 700;
      color: #0f172a;
      letter-spacing: -0.2px;
      line-height: 1.2;
    }

    .subtitle {
      font-size: 11px;
      color: #64748b;
      font-weight: 500;
    }

    .reset-btn {
      font-size: 11.5px;
      font-weight: 600;
      background: #f8fafc;
      color: #334155;
      border: 1px solid #cbd5e1;
      padding: 5px 12px;
      border-radius: 16px;
      cursor: pointer;
      transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
      white-space: nowrap;
    }
    .reset-btn:hover {
      background: #f1f5f9;
      border-color: #94a3b8;
    }
    .reset-btn:active {
      background: #e2e8f0;
    }

    /* Status Pill Bar */
    .status-bar {
      width: 100%;
      max-width: 440px;
      display: flex;
      align-items: center;
      justify-content: center;
      background: #f8fafc;
      border: 1px solid #e2e8f0;
      border-radius: 20px;
      padding: 5px 12px;
      margin-bottom: 4px;
      font-size: 11.5px;
      font-weight: 600;
      color: #0369a1;
      text-align: center;
      transition: background-color 0.3s ease, border-color 0.3s ease, color 0.3s ease;
      min-height: 28px;
    }

    .status-bar.active-mode {
      background: #f0f9ff;
      border-color: #bae6fd;
    }

    .stage {
      position: relative;
      width: 100%;
      max-width: 440px;
      aspect-ratio: 440 / 380;
      max-height: 420px;
      display: flex;
      align-items: center;
      justify-content: center;
    }

    svg.network {
      position: absolute;
      inset: 0;
      width: 100%;
      height: 100%;
      overflow: visible;
    }

    .flow-path {
      fill: none;
      stroke: #cbd5e1;
      stroke-width: 2.5;
      stroke-dasharray: 5 4;
      transition: stroke 0.35s ease, stroke-width 0.35s ease, opacity 0.35s ease;
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    .flow-path.active {
      stroke: #0284c7;
      stroke-width: 3.5;
      stroke-dasharray: none;
      opacity: 1;
    }

    .flow-path.dimmed {
      opacity: 0.15;
    }

    .droplet {
      fill: #0284c7;
      filter: drop-shadow(0 1px 2px rgba(2, 132, 199, 0.45));
      transition: opacity 0.35s ease, fill 0.35s ease;
    }

    .droplet.dimmed {
      opacity: 0.05;
    }

    /* Path Label Pill Badges */
    .path-label-group {
      transition: opacity 0.35s ease;
      cursor: default;
    }
    
    .path-label-bg {
      fill: #ffffff;
      stroke: #cbd5e1;
      stroke-width: 1.2;
      rx: 6px;
      filter: drop-shadow(0 1px 2px rgba(0, 0, 0, 0.04));
      transition: fill 0.35s ease, stroke 0.35s ease, stroke-width 0.35s ease;
    }

    .path-label-text {
      font-size: 11px;
      font-weight: 700;
      fill: #334155;
      text-anchor: middle;
      dominant-baseline: central;
      transition: fill 0.35s ease, font-weight 0.35s ease;
    }

    .path-label-group.active .path-label-bg {
      fill: #f0f9ff;
      stroke: #0284c7;
      stroke-width: 1.6;
    }

    .path-label-group.active .path-label-text {
      fill: #0369a1;
      font-weight: 800;
    }

    .path-label-group.dimmed {
      opacity: 0.2;
    }

    /* Sphere Badges */
    .node {
      position: absolute;
      width: 76px;
      height: 76px;
      border-radius: 50%;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      background: #ffffff;
      border: 3px solid;
      box-shadow: 0 3px 8px rgba(0, 0, 0, 0.06);
      transition: box-shadow 0.3s ease, opacity 0.3s ease, border-color 0.3s ease, background-color 0.3s ease;
      z-index: 10;
      text-align: center;
    }

    .node:hover {
      box-shadow: 0 4px 12px rgba(0, 0, 0, 0.12);
    }

    .node .icon {
      font-size: 21px;
      line-height: 1;
      margin-bottom: 2px;
    }

    .node .name {
      font-size: 10px;
      font-weight: 700;
      letter-spacing: -0.2px;
      line-height: 1.1;
    }

    .node.dimmed {
      opacity: 0.28;
      box-shadow: none;
    }

    /* Position & Theme colors */
    .node-atmo {
      top: 0%;
      left: 50%;
      transform: translateX(-50%);
      border-color: #38bdf8;
      color: #0284c7;
    }

    .node-bio {
      top: 50%;
      right: 0%;
      transform: translateY(-50%);
      border-color: #16a34a;
      color: #15803d;
    }

    .node-hydro {
      bottom: 0%;
      left: 50%;
      transform: translateX(-50%);
      border-color: #0284c7;
      color: #0369a1;
    }

    .node-geo {
      top: 50%;
      left: 0%;
      transform: translateY(-50%);
      border-color: #b45309;
      color: #92400e;
    }

    .node.selected {
      box-shadow: 0 0 0 3px rgba(2, 132, 199, 0.25), 0 4px 12px rgba(0, 0, 0, 0.14);
      background-color: #fafbfc;
    }

    /* Center Decorative Subtle Icon */
    .center-water-mark {
      position: absolute;
      top: 50%;
      left: 50%;
      transform: translate(-50%, -50%);
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      pointer-events: none;
      z-index: 2;
      opacity: 0.85;
      transition: opacity 0.35s ease;
    }

    .center-water-mark .hub-icon {
      font-size: 22px;
      line-height: 1;
      filter: drop-shadow(0 2px 4px rgba(2, 132, 199, 0.15));
    }

    .center-water-mark .hub-text {
      font-size: 9.5px;
      font-weight: 700;
      color: #64748b;
      letter-spacing: 0.3px;
      text-transform: uppercase;
      margin-top: 2px;
    }

    @media (max-width: 380px) {
      body {
        padding: 8px 10px 10px;
      }
      .node {
        width: 68px;
        height: 68px;
      }
      .node .icon {
        font-size: 18px;
      }
      .node .name {
        font-size: 9px;
      }
      .title {
        font-size: 14px;
      }
      .subtitle {
        font-size: 10px;
      }
      .status-bar {
        font-size: 10.5px;
        padding: 4px 8px;
      }
      .path-label-text {
        font-size: 9.5px;
      }
    }
  </style>
</head>
<body>

  <div class="header-bar">
    <div class="title-group">
      <div class="title">Water in Earth's Systems</div>
      <div class="subtitle">Tap any sphere to trace its water flows</div>
    </div>
    <button class="reset-btn" id="resetBtn" onclick="selectSphere('all')">Show All</button>
  </div>

  <div class="status-bar" id="statusBar">
    💧 Closed Global Cycle — All Spheres Interconnected
  </div>

  <div class="stage">
    <svg class="network" viewBox="0 0 440 380">
      
      
      <path id="p-hydro-atmo" class="flow-path" data-from="hydro" data-to="atmo" d="M 185 315 C 95 240 95 140 185 65" />
      
      
      <path id="p-atmo-hydro" class="flow-path" data-from="atmo" data-to="hydro" d="M 255 65 C 345 140 345 240 255 315" />
      
      
      <path id="p-bio-atmo" class="flow-path" data-from="bio" data-to="atmo" d="M 370 160 C 355 105 310 65 255 45" />

      
      <path id="p-atmo-geo" class="flow-path" data-from="atmo" data-to="geo" d="M 185 45 C 130 65 85 105 70 160" />

      
      <path id="p-geo-hydro" class="flow-path" data-from="geo" data-to="hydro" d="M 70 220 C 85 275 130 315 185 335" />

      
      <path id="p-hydro-bio" class="flow-path" data-from="hydro" data-to="bio" d="M 255 335 C 310 315 355 275 370 220" />

      
      <circle class="droplet" r="4.5" data-path="p-hydro-atmo">
        <animateMotion dur="3.6s" repeatCount="indefinite">
          <mpath href="#p-hydro-atmo"/>
        </animateMotion>
      </circle>

      <circle class="droplet" r="4.5" data-path="p-atmo-hydro">
        <animateMotion dur="3.2s" repeatCount="indefinite" begin="0.8s">
          <mpath href="#p-atmo-hydro"/>
        </animateMotion>
      </circle>

      <circle class="droplet" r="4" data-path="p-bio-atmo">
        <animateMotion dur="3.8s" repeatCount="indefinite" begin="1.2s">
          <mpath href="#p-bio-atmo"/>
        </animateMotion>
      </circle>

      <circle class="droplet" r="4" data-path="p-atmo-geo">
        <animateMotion dur="3.7s" repeatCount="indefinite" begin="0.2s">
          <mpath href="#p-atmo-geo"/>
        </animateMotion>
      </circle>

      <circle class="droplet" r="4" data-path="p-geo-hydro">
        <animateMotion dur="3.4s" repeatCount="indefinite" begin="1.5s">
          <mpath href="#p-geo-hydro"/>
        </animateMotion>
      </circle>

      <circle class="droplet" r="4" data-path="p-hydro-bio">
        <animateMotion dur="3.6s" repeatCount="indefinite" begin="0.5s">
          <mpath href="#p-hydro-bio"/>
        </animateMotion>
      </circle>

      
      
      <g class="path-label-group" id="grp-evap">
        <rect x="70" y="179" width="94" height="22" class="path-label-bg" />
        <text x="117" y="190" class="path-label-text">Evaporation ↑</text>
      </g>

      
      <g class="path-label-group" id="grp-precip">
        <rect x="276" y="179" width="94" height="22" class="path-label-bg" />
        <text x="323" y="190" class="path-label-text">↓ Rain / Snow</text>
      </g>

      
      <g class="path-label-group" id="grp-trans">
        <rect x="276" y="82" width="94" height="22" class="path-label-bg" />
        <text x="323" y="93" class="path-label-text">Transpiration</text>
      </g>

      
      <g class="path-label-group" id="grp-infilt">
        <rect x="70" y="82" width="94" height="22" class="path-label-bg" />
        <text x="117" y="93" class="path-label-text">Infiltration</text>
      </g>

      
      <g class="path-label-group" id="grp-runoff">
        <rect x="70" y="276" width="94" height="22" class="path-label-bg" />
        <text x="117" y="287" class="path-label-text">Runoff ➔</text>
      </g>

      
      <g class="path-label-group" id="grp-uptake">
        <rect x="276" y="276" width="94" height="22" class="path-label-bg" />
        <text x="323" y="287" class="path-label-text">Plant Uptake</text>
      </g>
    </svg>

    
    <div class="center-water-mark">
      <span class="hub-icon">💧</span>
      <span class="hub-text">Continuous Cycle</span>
    </div>

    
    <div class="node node-atmo" id="node-atmo" onclick="selectSphere('atmo')">
      <div class="icon">☁️</div>
      <div class="name">Atmosphere</div>
    </div>

    <div class="node node-bio" id="node-bio" onclick="selectSphere('bio')">
      <div class="icon">🌱</div>
      <div class="name">Biosphere</div>
    </div>

    <div class="node node-hydro" id="node-hydro" onclick="selectSphere('hydro')">
      <div class="icon">🌊</div>
      <div class="name">Hydrosphere</div>
    </div>

    <div class="node node-geo" id="node-geo" onclick="selectSphere('geo')">
      <div class="icon">⛰️</div>
      <div class="name">Geosphere</div>
    </div>
  </div>

  <script>
    let activeSphere = 'all';

    const infoMap = {
      'all': '💧 Closed Global Cycle — All Spheres Interconnected',
      'atmo': '☁️ Atmosphere — Water vapor, cloud condensation & precipitation',
      'bio': '🌱 Biosphere — Plant transpiration and root water uptake',
      'hydro': '🌊 Hydrosphere — Oceans, lakes, evaporation & precipitation basin',
      'geo': '⛰️ Geosphere — Soil moisture, rock filtration & runoff aquifers'
    };

    function selectSphere(id) {
      activeSphere = id;

      // Update Status Bar
      const statusBar = document.getElementById('statusBar');
      statusBar.textContent = infoMap[id] || infoMap['all'];
      if (id === 'all') {
        statusBar.classList.remove('active-mode');
      } else {
        statusBar.classList.add('active-mode');
      }

      // Update Nodes
      const nodes = ['atmo', 'bio', 'hydro', 'geo'];
      nodes.forEach(n => {
        const el = document.getElementById('node-' + n);
        if (id === 'all') {
          el.classList.remove('dimmed', 'selected');
        } else if (n === id) {
          el.classList.add('selected');
          el.classList.remove('dimmed');
        } else {
          const connected = isConnected(id, n);
          el.classList.remove('selected');
          if (connected) {
            el.classList.remove('dimmed');
          } else {
            el.classList.add('dimmed');
          }
        }
      });

      // Update Paths and Droplets
      const paths = document.querySelectorAll('.flow-path');
      paths.forEach(p => {
        const from = p.getAttribute('data-from');
        const to = p.getAttribute('data-to');
        const pathId = p.id;
        const droplet = document.querySelector(`.droplet[data-path="${pathId}"]`);

        if (id === 'all') {
          p.classList.remove('active', 'dimmed');
          if (droplet) droplet.classList.remove('dimmed');
        } else if (from === id || to === id) {
          p.classList.add('active');
          p.classList.remove('dimmed');
          if (droplet) droplet.classList.remove('dimmed');
        } else {
          p.classList.remove('active');
          p.classList.add('dimmed');
          if (droplet) droplet.classList.add('dimmed');
        }
      });

      // Update Labels
      const labelGroups = document.querySelectorAll('.path-label-group');
      labelGroups.forEach(grp => {
        if (id === 'all') {
          grp.classList.remove('active', 'dimmed');
        } else {
          grp.classList.add('dimmed');
          grp.classList.remove('active');
        }
      });

      if (id === 'atmo') {
        activateLabel('grp-evap');
        activateLabel('grp-precip');
        activateLabel('grp-trans');
        activateLabel('grp-infilt');
      } else if (id === 'hydro') {
        activateLabel('grp-evap');
        activateLabel('grp-precip');
        activateLabel('grp-runoff');
        activateLabel('grp-uptake');
      } else if (id === 'bio') {
        activateLabel('grp-trans');
        activateLabel('grp-uptake');
      } else if (id === 'geo') {
        activateLabel('grp-runoff');
        activateLabel('grp-infilt');
      }
    }

    function activateLabel(groupId) {
      const el = document.getElementById(groupId);
      if (el) {
        el.classList.remove('dimmed');
        el.classList.add('active');
      }
    }

    function isConnected(a, b) {
      if (a === b) return true;
      const paths = document.querySelectorAll('.flow-path');
      for (const p of paths) {
        const f = p.getAttribute('data-from');
        const t = p.getAttribute('data-to');
        if ((f === a && t === b) || (f === b && t === a)) return true;
      }
      return false;
    }
  </script>
</body>
</html>

OGS.10.ECO.2

Aligned learning resources

Related diagrams