<!DOCTYPE html>
<html>
<head>
<title>Foggy evening</title>
</head>
<body>

<div class="city-photo"></div>

<div class="city-shade"></div>

<div class="glass-fog"></div>

<canvas id="rainCanvas" aria-hidden="true"></canvas>

<div class="rain-trails" id="rainTrails"></div>

<div class="glass-reflection"></div>

<div class="window-frame">
      <div class="vertical-frame"></div>
      <div class="horizontal-frame"></div>
      <div class="window-sill"></div>
    </div>

<div class="scene-content">

<div class="eyebrow">
        SOMEWHERE IN THE CITY
      </div>

<h1>
        Foggy<br>
        <em>Evening.</em>
      </h1>

<p>
        A quiet evening, a warm room,<br>
        and the city fading into the mist.
      </p>

</div>

<div class="rain-controls">

<div>
        <strong>Foggy Evening</strong>
        <small>A quiet city atmosphere</small>
      </div>

</div>

<label for="rainAmount">
        Rain density
      </label>

</div>

<label for="fogAmount">
        Window fog
      </label>

</div>

<button
      id="resetButton"
      class="reset-button"
      type="button"
    >
      Reset
    </button>

</div>

</div>

</body>
</html>

@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Playfair+Display:ital,wght@0,500;1,500&display=swap');

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: #10151c;
  color: white;
  font-family: 'DM Sans', sans-serif;
}

button,
input {
  font: inherit;
}

button:focus-visible,
input:focus-visible {
  outline: 3px solid #ffd49b;
  outline-offset: 4px;
}

.rain-app {
  min-height: 100vh;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

/* SCENE */

.rain-scene {
  position: relative;
  isolation: isolate;
  overflow: hidden;

height: 72vh;
  min-height: 500px;
  max-height: 760px;

border-radius: 16px;
  background: #192635;

--fog: .35;
}

/* REAL CITY PHOTO */

.city-photo {
  position: absolute;
  inset: -10px;

background-image:
    url('https://images.unsplash.com/photo-1519501025264-65ba15a82390?w=1600&q=80');

background-size: cover;
  background-position: center;

filter: blur(2px) brightness(.78);
}

/* DARK ATMOSPHERE */

.city-shade {
  position: absolute;
  inset: 0;

background:
    linear-gradient(
      90deg,
      rgba(5,12,23,.67),
      rgba(5,12,23,.15) 70%
    ),
    linear-gradient(
      0deg,
      rgba(5,12,23,.5),
      transparent 45%
    );
}

/* FOGGED GLASS */

.glass-fog {
  position: absolute;
  inset: 0;

opacity: var(--fog);

background:
    linear-gradient(
      110deg,
      rgba(180,200,220,.38),
      rgba(180,200,220,.06) 50%,
      rgba(190,210,225,.3)
    );

pointer-events: none;
}

/* RAIN CANVAS */

#rainCanvas {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

/* MOVING WATER */

.rain-trails {
  position: absolute;
  inset: 0;
  overflow: hidden;
  pointer-events: none;
}

.water-trail {
  position: absolute;
  top: -25%;

width: 2px;
  height: var(--length);

border-radius: 20px;

background:
    linear-gradient(
      to bottom,
      transparent,
      rgba(230,245,255,.18) 40%,
      rgba(255,255,255,.7)
    );

box-shadow:
    1px 0 1px rgba(0,0,0,.3);

animation:
    waterSlide var(--duration) linear var(--delay) infinite;
}

.water-trail::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: -2px;

width: 6px;
  height: 10px;

border-radius: 50%;
  background: rgba(230,245,255,.65);
}

@keyframes waterSlide {
  from {
    transform: translateY(-100px);
  }

to {
    transform: translateY(1100px);
  }
}

/* REFLECTION */

.glass-reflection {
  position: absolute;
  inset: 0;
  pointer-events: none;

background:
    linear-gradient(
      110deg,
      rgba(255,255,255,.09),
      transparent 28%
    ),
    radial-gradient(
      ellipse at 8% 45%,
      rgba(255,190,130,.1),
      transparent 35%
    );
}

/* WINDOW FRAME */

.window-frame {
  position: absolute;
  inset: 0;

border: 14px solid #17212d;

box-shadow:
    inset 0 0 0 1px rgba(255,255,255,.2),
    inset 0 0 25px rgba(0,0,0,.4);

pointer-events: none;
}

.vertical-frame {
  position: absolute;
  top: 0;
  bottom: 0;
  left: 70%;

width: 17px;

background:
    linear-gradient(
      90deg,
      #101820,
      #3c4a59,
      #101820
    );
}

.horizontal-frame {
  position: absolute;
  top: 73%;
  left: 0;
  right: 0;

height: 16px;

background:
    linear-gradient(
      #3c4a59,
      #101820
    );
}

.window-sill {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;

height: 28px;

background:
    linear-gradient(
      #3c4a59,
      #101820
    );
}

/* CONTENT */

.scene-content {
  position: absolute;
  z-index: 5;

top: 48%;
  left: 8%;

transform: translateY(-50%);
}

.eyebrow {
  color: #f4d6b2;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 3px;
}

.scene-content h1 {
  margin: 20px 0;

font-family: 'Playfair Display', serif;
  font-size: clamp(65px, 9vw, 130px);
  font-weight: 500;

line-height: 1.02;
  letter-spacing: -4px;

text-shadow: 0 5px 25px #000a;
}

.scene-content h1 em {
  color: #f1d0aa;
}

.scene-content p {
  font-size: 17px;
  line-height: 1.7;
  color: #ffffff;
  text-shadow: 0 2px 10px #000;
}

/* RAIN BADGE */

.rain-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;

margin-top: 22px;
  padding: 12px 17px;

border: 1px solid rgba(255,255,255,.7);
  border-radius: 30px;

background: rgba(10,20,32,.85);

font-size: 10px;
  font-weight: 700;
  letter-spacing: 1px;
}

.badge-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #9bd3ff;
}

/* FOOTER */

.scene-footer {
  position: absolute;
  z-index: 5;

left: 5%;
  right: 5%;
  bottom: 40px;

display: flex;
  justify-content: space-between;
  gap: 15px;

font-size: 10px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-shadow: 0 2px 10px #000;
}

/* CONTROLS */

.rain-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 25px;

padding: 20px 25px;

border: 1px solid #526174;
  border-radius: 12px;

background: #1d2735;
}

.control-title {
  display: flex;
  align-items: center;
  gap: 13px;
  margin-right: auto;
}

.control-icon {
  display: grid;
  place-items: center;

width: 45px;
  height: 45px;

border-radius: 10px;
  background: #34475c;

font-size: 24px;
}

.control-title strong {
  display: block;
  font-size: 15px;
}

.control-title small {
  display: block;
  margin-top: 4px;
  color: #d1dbe8;
  font-size: 12px;
}

.control-field {
  display: flex;
  align-items: center;
  gap: 12px;
}

.control-field label {
  font-size: 13px;
  font-weight: 600;
  white-space: nowrap;
}

.control-field input {
  width: 120px;
  accent-color: #f1d0a5;
}

.control-field output {
  min-width: 38px;
  color: #f1d0a5;
  font-size: 12px;
  font-weight: 700;
}

.reset-button {
  min-height: 44px;
  padding: 10px 20px;

border: 1px solid #c5d2e0;
  border-radius: 8px;

background: transparent;
  color: white;

font-size: 13px;
  font-weight: 700;
  cursor: pointer;
}

.reset-button:hover {
  background: #34475c;
}

/* RESPONSIVE */

@media (max-width: 800px) {

.rain-app {
    padding: 12px;
  }

.rain-scene {
    height: 650px;
  }

}

@media (max-width: 520px) {

.rain-scene {
    height: 600px;
    min-height: 600px;
  }

.scene-content {
    left: 8%;
    right: 8%;
  }

.scene-content h1 {
    font-size: 62px;
    letter-spacing: -2px;
  }

.scene-content p {
    font-size: 14px;
  }

.scene-footer {
    font-size: 8px;
    letter-spacing: .5px;
  }

.control-title {
    width: 100%;
  }

.control-field {
    width: 100%;
  }

.control-field input {
    flex: 1;
    min-width: 0;
  }

}

/* REDUCED MOTION */

@media (prefers-reduced-motion: reduce) {

.water-trail {
    animation: none !important;
  }

}

(function () {

var canvas = document.getElementById("rainCanvas");
  var rainTrails = document.getElementById("rainTrails");

var rainAmount = document.getElementById("rainAmount");
  var fogAmount = document.getElementById("fogAmount");

var rainOutput = document.getElementById("rainOutput");
  var fogOutput = document.getElementById("fogOutput");

var rainScene = document.getElementById("rainScene");
  var resetButton = document.getElementById("resetButton");

if (!canvas || !rainScene) return;

var ctx = canvas.getContext("2d");

if (!ctx) return;

var reducedMotion = window.matchMedia(
    "(prefers-reduced-motion: reduce)"
  );

var resizeTimer = null;
  var rainTimer = null;

function random(min, max) {
    return Math.random() * (max - min) + min;
  }

// DRAW WATER DROPLETS

function drawDroplet(x, y, size) {

ctx.save();

// DROP BODY

ctx.beginPath();

ctx.ellipse(
      x,
      y,
      size * .65,
      size,
      0,
      0,
      Math.PI * 2
    );

var gradient = ctx.createLinearGradient(
      x - size,
      y - size,
      x + size,
      y + size
    );

gradient.addColorStop(
      0,
      "rgba(255,255,255,.65)"
    );

gradient.addColorStop(
      .45,
      "rgba(255,255,255,.06)"
    );

gradient.addColorStop(
      1,
      "rgba(185,220,245,.45)"
    );

ctx.fillStyle = gradient;
    ctx.fill();

// DARK EDGE

ctx.strokeStyle = "rgba(10,25,40,.35)";
    ctx.lineWidth = .6;
    ctx.stroke();

// SMALL HIGHLIGHT

if (size > 3) {

ctx.beginPath();

ctx.ellipse(
        x - size * .2,
        y - size * .3,
        size * .12,
        size * .22,
        -.4,
        0,
        Math.PI * 2
      );

ctx.fillStyle = "rgba(255,255,255,.75)";
      ctx.fill();

}

ctx.restore();

}

// DRAW STATIC RAIN

function drawRain() {

var rect = canvas.getBoundingClientRect();

var width = rect.width;
    var height = rect.height;

if (width <= 0 || height <= 0) return;

// CAP RESOLUTION FOR SLOWER COMPUTERS

var scale = Math.min(window.devicePixelRatio || 1, 1.5);

canvas.width = Math.floor(width * scale);
    canvas.height = Math.floor(height * scale);

ctx.setTransform(scale, 0, 0, scale, 0, 0);

ctx.clearRect(0, 0, width, height);

var intensity = Number(rainAmount.value);

// DENSE RAIN, BUT ONLY ONE CANVAS ELEMENT

var count = Math.floor(intensity * 4);

for (var i = 0; i < count; i++) {

var x = random(0, width);
      var y = random(0, height);

var size;

if (Math.random() < .85) {
        size = random(1, 3.5);
      } else {
        size = random(4, 9);
      }

drawDroplet(x, y, size);

}

// CREATE A FEW ANIMATED TRAILS

function createTrails() {

var fragment = document.createDocumentFragment();

var intensity = Number(rainAmount.value);

var count = Math.floor(intensity * .16);

// NEVER MORE THAN 12 TRAILS

count = Math.min(count, 12);

for (var i = 0; i < count; i++) {

var trail = document.createElement("span");

trail.className = "water-trail";

trail.style.left = random(0, 100) + "%";

trail.style.setProperty(
        "--length",
        random(60, 160) + "px"
      );

trail.style.setProperty(
        "--duration",
        random(9, 20) + "s"
      );

trail.style.setProperty(
        "--delay",
        random(-20, 0) + "s"
      );

fragment.appendChild(trail);

}

rainTrails.replaceChildren(fragment);

}

// UPDATE RAIN

function updateRain() {

rainOutput.textContent = rainAmount.value + "%";

drawRain();
    createTrails();

}

// THROTTLE UPDATES

function scheduleRainUpdate() {

rainOutput.textContent = rainAmount.value + "%";

clearTimeout(rainTimer);

rainTimer = setTimeout(updateRain, 120);

}

// UPDATE FOG

function updateFog() {

var value = Number(fogAmount.value);

fogOutput.textContent = value + "%";

rainScene.style.setProperty(
      "--fog",
      value / 100
    );

}

// RESIZE

window.addEventListener("resize", function () {

clearTimeout(resizeTimer);

resizeTimer = setTimeout(drawRain, 180);

});

// EVENTS

rainAmount.addEventListener(
    "input",
    scheduleRainUpdate
  );

fogAmount.addEventListener(
    "input",
    updateFog
  );

resetButton.addEventListener("click", function () {

clearTimeout(rainTimer);

rainAmount.value = 75;
    fogAmount.value = 35;

updateRain();
    updateFog();

});

// INITIALIZE

updateRain();
  updateFog();

})();

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