/* ==============================
   Root variables for colors & sizes
   ============================== */
:root {
  --background-color: #f0f4f8;
  --text-color: #222222;
  --header-bg-color: #1e3a8a;
  --header-text-color: #ffffff;
  --subtext-color: #555555;
  --container-shadow: rgba(0, 0, 0, 0.1);
  --card-shadow: rgba(0, 0, 0, 0.15);
  --card-hover-shadow: rgba(0, 0, 0, 0.25);
  --card-bg-color: #4caff9;
  --card-border-radius: 20px;
  --card-width: 250px;
  --card-height: 100px;
  --card-font-color: #ffffff;
  --primary-color: #f10800;
  --success-color: #4caf50;
  --primary-text: white;
}

/* ==============================
   Keyframes for Animations
   ============================== */
@keyframes fadeIn {
  0% {
    opacity: 0;
  }
  100% {
    opacity: 1;
  }
}

@keyframes fadeOut {
  0% {
    opacity: 1;
  }
  100% {
    opacity: 0;
  }
}

/* ==============================
   General Body
   ============================== */
body {
  font-family: Arial, sans-serif;
  color: var(--text-color);
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  min-height: 100vh;
  animation: fadeIn 0.8s ease forwards;
  background: url("../images/kioskBackground3.jpg") no-repeat;
  background-position: center;
  background-size: contain;
  position: relative;
  overflow: hidden;
}
/* Backdrop overlay */
body::before {
  content: "";
  position: absolute;
  inset: 0; /* shorthand for top:0; right:0; bottom:0; left:0 */
  background: rgba(255, 255, 255, 0.822); /* dark transparent overlay */
  backdrop-filter: blur(5px); /* adds a soft blur effect */
  z-index: -1; /* keeps it behind the content */
}
p {
  font-size: 22px;
}
/* ==============================
   Header
   ============================== */
header {
  width: 100%;
  padding: 20px 0;
  text-align: center;
  background-color: var(--header-bg-color);
  box-shadow: 0 2px 4px var(--card-shadow);
}

header h1 {
  margin: 0;
  font-size: 2em;
  color: var(--header-text-color);
}
p {
  font-weight: bold;
}

/* ==============================
   Page title
   ============================== */
.page_title {
  margin: 40px 0 20px;
  text-align: center;
  animation: fadeIn 1s ease forwards;
}

.page_title h2 {
  margin: 0;
  font-size: 2em;
}

.page_title p {
  margin: 10px 0 0;
  font-size: 1.2em;
  color: var(--primary-color);
}

/* ==============================
   Page container
   ============================== */
.page_container {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
  justify-content: center;
  flex-direction: column;
  align-items: center;
  min-width: 40%;
  padding: 10px;
  box-shadow: 1px 1px 3px var(--container-shadow);
  border-radius: var(--card-border-radius);
  min-height: 25em;
  position: relative;
  animation: fadeIn 1s ease forwards;
  background-color: var(--background-color);
}

/* ==============================
   Option card
   ============================== */
.option-card {
  border: none;
  border-radius: var(--card-border-radius);
  width: var(--card-width);
  height: var(--card-height);
  padding: 30px 20px;
  text-align: center;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.5s ease;
  text-decoration: none;
  color: var(--card-font-color);
  display: flex;
  flex-direction: column;
  justify-content: center;
  box-shadow: 0 6px 15px var(--card-shadow);
  font-size: 1.2em;
  background-color: var(--card-bg-color);
  opacity: 0; /* start hidden */
  animation: fadeIn 1s ease forwards;
}

/* Staggered cards */
.option-card:nth-child(1) {
  animation-delay: 0.1s;
}
.option-card:nth-child(2) {
  animation-delay: 0.2s;
}
.option-card:nth-child(3) {
  animation-delay: 0.3s;
}
.option-card:nth-child(4) {
  animation-delay: 0.4s;
}

.option-card:hover {
  transform: translateY(-8px);
  box-shadow: 0 10px 20px var(--card-hover-shadow);
}

.option-card h3 {
  margin: 0 0 10px;
  font-size: 1.6em;
}
.option-card p {
  margin: 0;
  font-size: 1em;
}

/* ==============================
   Buttons
   ============================== */
button {
  padding: 12px 25px;
  font-size: 1.1em;
  border: none;
  border-radius: var(--card-border-radius);
  background-color: #2196f3;
  color: #fff;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease,
    background-color 0.3s ease;
}

button[name="home"] {
  background-color: var(--primary-color);
  color: var(--primary-text);
}
button[name="proceed"] {
  background-color: var(--success-color);
  color: var(--primary-text);
}

button:hover {
  transform: translateY(-4px);
  box-shadow: 0 6px 12px var(--card-hover-shadow);
}

/* ==============================
   Highlighted span
   ============================== */
.highlight {
  transition: color 0.3s ease;
}

/* ==============================
   Input boxes
   ============================== */
#inputboxes {
  width: 50%;
  border-color: var(--container-shadow);
  padding: 5px;
  font-size: 20px;
  outline: none;
  border-radius: 4px;
  text-align: center;
  height: 2em;
  color: var(--subtext-color);
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

#inputboxes:focus {
  border-color: var(--primary-color);
  box-shadow: 0 0 8px var(--primary-color);
  transform: scale(1.02);
}

#inputboxes::-webkit-outer-spin-button,
#inputboxes::-webkit-inner-spin-button {
  -webkit-appearance: none;
  margin: 0;
}
#inputboxes[type="number"] {
  -moz-appearance: textfield;
}

/* ==============================
   Button Group
   ============================== */
.btn_group {
  position: absolute;
  bottom: 2%;
  display: flex;
  gap: 15px;
  justify-content: center;
  width: 100%;
  opacity: 0;
  animation: fadeIn 1s ease forwards;
  animation-delay: 0.5s;
}
#recharge_card {
  box-shadow: 3px 3px 4px gray;
  border-radius: 12px;
}
/* Base style */
#logo {
  width: 18vw; /* Responsive width relative to viewport */
  max-width: 150px; /* Prevents it from becoming too big on large screens */
  min-width: 60px; /* Prevents it from becoming too small on mobiles */
  position: absolute;
  left: 2%;
  top: 6%;
  height: auto;
}

/* Tablet adjustments */
@media (max-width: 1024px) {
  #logo {
    width: 20vw;
    top: 5%;
  }
}

/* Mobile adjustments */
@media (max-width: 600px) {
  #logo {
    width: 25vw;
    left: 3%;
    top: 4%;
  }
}

#heading {
  color: var(--primary-color);
}