/* ===== BODY & BACKGROUND ===== */
body {
  margin: 0;
  height: 100vh;
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  overflow: hidden;
  position: relative;
}

/* Animated Gradient Background */
body::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(-45deg, #f5923e, #f5a623, #d4d4d2, #a6a6a6);
  background-size: 400% 400%;
  animation: gradientBG 15s ease infinite;
  z-index: -2;
}

@keyframes gradientBG {
  0%   { background-position: 0% 50%; }
  50%  { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

/* Floating Dots Animation */
body::after {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background-image: radial-gradient(circle, rgba(255,255,255,0.3) 1px, transparent 1px);
  background-size: 20px 20px;
  animation: moveDots 10s linear infinite;
  z-index: -1;
}

@keyframes moveDots {
  0%   { background-position: 0 0; }
  100% { background-position: 100px 100px; }
}

/* ===== INPUT DISPLAY ===== */
.text {
  border-radius: 5px;
  height: 70px;
  width: 480px;
  justify-items: center;
  font-size: 30px;
  margin-left: 2px;
  background-color: rgba(236, 236, 230, 0.8);
  box-shadow: inset 0 2px 4px rgba(0,0,0,0.2);
  padding-right: 10px;
  text-align: right;
  border: none;
  outline: none;
  position: relative;
  z-index: 1;
}

/* ===== CALCULATOR CONTAINER ===== */
.bord {
  border: 3px solid rgba(157, 152, 97, 0.8);
  height: 487px;
  width: 492px;
  box-shadow: 0 6px 20px rgba(0,0,0,0.25);
  border-radius: 10px;
  overflow: hidden;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  position: relative;
  z-index: 1;
  background-color: rgba(255,255,255,0.1);
}

/* ===== BUTTONS ===== */
.box,
.oparation,
.special {
  border-radius: 10px;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.2s ease;
  flex: 0 0 auto;
}

/* Number Buttons */
.box {
  height: 100px;
  width: 120px;
  background-color: #d4d4d2;
  color: #000;
}

.box:hover {
  background-color: #c6c6c6;
  box-shadow: 0 0 8px rgba(255,255,255,0.3);
  transform: scale(1.05);
}

/* Operation Buttons (+, -, ×, ÷) */
.oparation {
  height: 100px;
  width: 120px;
  background-color: #f5923e;
  color: #fff;
}

.oparation:hover {
  background-color: #e07b1f;
  box-shadow: 0 0 10px rgba(255,170,0,0.5);
  transform: scale(1.05);
}



.special:hover {
  background-color: #8c8c8c;
  transform: scale(1.05);
}

/* Button press effect */
.box:active,
.oparation:active,
.special:active {
  transform: scale(0.96);
}

/* ===== MOBILE RESPONSIVE FIX ===== */
@media (max-width: 600px) {
  .bord {
    width: 95%;
    height: auto;
    margin: auto;
  }
  
  .text {
    width: 100%;
    height: 60px;
    font-size: 22px;
  }
  
  .box,
  .oparation,
  .special {
    width: 22%;
    height: 70px;
    font-size: 18px;
    margin: 4px;
  }
  
  center {
    margin-top: 20px;
  }
}

/* ===== BOX-SIZING ===== */
* {
  box-sizing: border-box;
}