Gallery slide reveal animation | HTML, CSS & JavaScript

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Poppins', sans-serif;
}

body {
  height: 100vh;
  background: #0a0a0a;
  display: flex;
  overflow: hidden;
  transition: 0.6s;
}

/* LIGHT MODE */
body.light-on {
  background: radial-gradient(circle at 30% 30%, #fff3b0, #d6b85a);
}

/* LAYOUT */
.left {
  width: 50%;
  position: relative;
}
.right {
  width: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transform: translateX(100%);
  opacity: 0;
  transition: 0.8s cubic-bezier(.25,.8,.25,1);
}
body.light-on .right {
  transform: translateX(0);
  opacity: 1;
}

/* BULB POSITION */
.bulb-position {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
}

/* SWING LAYER */
.bulb-swing {
  transform-origin: top center;
}

/* WIRE */
.wire {
  width: 2px;
  height: 180px;
  background: linear-gradient(#777, #333);
  margin: auto;
}

/* BULB GLASS */
.bulb {
  width: 70px;
  height: 90px;
  border-radius: 50% 50% 45% 45%;
  margin: auto;
  position: relative;
  cursor: pointer;

background: radial-gradient(circle at 30% 30%, rgba(255,255,255,0.4), rgba(255,255,255,0.05));
  backdrop-filter: blur(6px);
  border: 1px solid rgba(255,255,255,0.2);

transition: 0.4s;
}

/* METAL HOLDER */
.bulb::before {
  content: "";
  position: absolute;
  top: -18px;
  left: 50%;
  transform: translateX(-50%);
  width: 32px;
  height: 22px;
  border-radius: 6px;
  background: linear-gradient(#888, #444);
}

/* FILAMENT */
.filament {
  position: absolute;
  top: 35%;
  left: 50%;
  width: 20px;
  height: 30px;
  transform: translateX(-50%);
  border: 2px solid #ffcc66;
  border-radius: 10px;
  opacity: 0.4;
  transition: 0.4s;
}

/* GLOW */
.glow {
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(255,240,150,0.5), transparent 70%);
  margin: auto;
  margin-top: -60px;
  opacity: 0;
  transition: 0.5s;
  filter: blur(10px);
}

/* LIGHT ON */
body.light-on .bulb {
  background: radial-gradient(circle at center, #fff6c0, #ffd54f);
  box-shadow:
    0 0 30px #ffd54f,
    0 0 80px #ffec99,
    0 0 140px rgba(255, 220, 100, 0.6);
}
body.light-on .filament {
  opacity: 1;
  box-shadow: 0 0 10px #ffcc66;
}
body.light-on .glow {
  opacity: 1;
}

/* SWING */
@keyframes swing {
  0% { transform: rotate(10deg); }
  50% { transform: rotate(-10deg); }
  100% { transform: rotate(10deg); }
}
.bulb-swing.animate {
  animation: swing 1.5s ease-in-out;
}

/* ================= LOGIN UI ================= */

.card {
  width: 360px;
  padding: 40px 30px;
  border-radius: 25px;

background: rgba(255, 255, 255, 0.15);
  backdrop-filter: blur(25px);

box-shadow:
    0 25px 60px rgba(0,0,0,0.4),
    inset 0 1px 1px rgba(255,255,255,0.2);

border: 1px solid rgba(255,255,255,0.2);

color: #222;
  text-align: center;
  position: relative;
  overflow: hidden;
}

/* shine */
.card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(255,255,255,0.2), transparent 60%);
  transform: rotate(25deg);
}

.card h2 {
  margin-bottom: 5px;
}

.subtitle {
  font-size: 13px;
  margin-bottom: 25px;
  opacity: 0.7;
}

/* INPUT */
.input-group {
  position: relative;
  margin-bottom: 20px;
}
.input-group input {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  border: none;
  outline: none;
  background: rgba(255,255,255,0.3);
  font-size: 14px;
}

/* FLOAT LABEL */
.input-group label {
  position: absolute;
  left: 14px;
  top: 14px;
  font-size: 14px;
  color: #555;
  pointer-events: none;
  transition: 0.3s;
}
.input-group input:focus + label,
.input-group input:valid + label {
  top: -8px;
  left: 10px;
  font-size: 11px;
  background: #fff;
  padding: 2px 6px;
  border-radius: 6px;
}

/* FOCUS */
.input-group input:focus {
  box-shadow: 0 0 0 2px rgba(255, 200, 0, 0.6);
}

/* BUTTON */
.login-btn {
  width: 100%;
  padding: 14px;
  border-radius: 12px;
  border: none;
  background: linear-gradient(135deg, #ffcc00, #ffaa00);
  font-weight: 600;
  cursor: pointer;
  transition: 0.3s;
}
.login-btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 10px 20px rgba(255,170,0,0.4);
}

/* EXTRA */
.extra {
  margin-top: 15px;
  font-size: 12px;
  opacity: 0.7;
  cursor: pointer;
}

- Gallery slide reveal animation

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