@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;600&display=swap');

* {
  margin: 0; padding: 0; box-sizing: border-box;
  font-family: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen,
    Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
  background:
    linear-gradient(rgba(0, 0, 0, 0.8), rgba(0, 0, 0, 0.8)),
    url('https://wallpaperaccess.com/full/333672.jpg') no-repeat center center/cover;
  color: #e0e0e0;
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 20px;
  user-select: none;
}

.app-container {
  background: transparent;
  backdrop-filter: blur(8px);
  border-radius: 16px;
  box-shadow:
    0 0 30px rgba(0, 0, 0, 0.9),
    inset 0 0 1px rgba(255, 255, 255, 0.05);
  max-width: 500px;
  width: 100%;
  padding: 40px 36px;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: box-shadow 0.3s ease;
}

h1 {
  font-weight: 700;
  font-size: 2.25rem;
  margin-bottom: 30px;
  color: #f0f0f0;
  letter-spacing: 0.03em;
  text-align: center;
  user-select: none;
}

.converter-card {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.input-group {
  position: relative;
  width: 100%;
}

input[type=number] {
  width: 100%;
  padding: 25px 18px 16px 18px;
  font-size: 1.1rem;
  border-radius: 10px;
  border: 1.8px solid #444;
  background-color: #2a2a2a;
  color: #e0e0e0;
  outline-offset: 2px;
  transition: border-color 0.3s ease, background-color 0.3s ease;
}

input[type=number]:focus + label,
input[type=number]:valid + label {
  top: 8px;
  left: 14px;
  font-size: 0.8rem;
  color: #4a90e2;
  padding: 0 6px;
  font-weight: 600;
  letter-spacing: 0.03em;
  pointer-events: none;
  user-select: none;
  position: absolute;
  transition: all 0.3s ease;
}

input[type=number]:focus {
  border-color: #4a90e2;
  background-color: #383838;
}

label {
  position: absolute;
  top: 16px;
  left: 18px;
  color: #888;
  font-size: 1rem;
  pointer-events: none;
  user-select: none;
  transition: all 0.3s ease;
  background-color: transparent;
}

.currency-selectors {
  display: flex;
  gap: 20px;
  justify-content: space-between;
  align-items: center;
  position: relative; /* Helps prevent dropdown overflow issues */
  z-index: 10;        /* Higher z-index so dropdowns overlay properly */
}

.currency-dropdown {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 14px;
  background-color: #2b2b2b;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1.8px solid #444;
  transition: border-color 0.3s ease, background-color 0.3s ease;
  position: relative; /* To position flags and dropdown correctly */
  cursor: pointer;
}

.currency-dropdown:hover {
  background-color: #383838;
  border-color: #4a90e2;
}

.currency-dropdown select {
  flex-grow: 1;
  background-color: transparent;
  border: none;
  color: #3d3d3d;
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  appearance: none;
  outline: none;
  user-select: none;
  padding: 6px 6px;
  
}

.flag {
  width: 36px;
  height: 24px;
  border-radius: 5px;
  object-fit: cover;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.8);
  user-select: none;
}

/* Add a custom arrow for select (optional) */
.currency-dropdown select::-ms-expand {
  display: none; /* IE10+ remove default arrow */
}

.currency-dropdown::after {
  content: '';
  position: absolute;
  right: 16px;
  pointer-events: none;
  top: 50%;
  transform: translateY(-50%);
  border-style: solid;
  border-width: 6px 5px 0 5px;
  border-color: #e0e0e0 transparent transparent transparent;
  user-select: none;
}

.switch-button {
  cursor: pointer;
  font-size: 1.8rem;
  padding: 9px 18px;
  border-radius: 50%;
  background-color: #4a90e2;
  color: #fff;
  border: none;
  box-shadow: 0 6px 14px rgba(74, 144, 226, 0.6);
  transition: background-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
  user-select: none;
  display: flex;
  justify-content: center;
  align-items: center;
}

.switch-button:hover {
  background-color: #346ac0;
  box-shadow: 0 8px 20px rgba(52, 106, 192, 0.8);
  transform: rotate(180deg);
}

button#convert-btn {
  width: 100%;
  background-color: #4a90e2;
  color: #fff;
  font-weight: 700;
  font-size: 1.25rem;
  padding: 16px 0;
  border-radius: 14px;
  border: none;
  cursor: pointer;
  box-shadow: 0 10px 28px rgba(74, 144, 226, 0.8);
  transition: background-color 0.3s ease, box-shadow 0.3s ease;
  user-select: none;
}

button#convert-btn:hover {
  background-color: #346ac0;
  box-shadow: 0 12px 34px rgba(52, 106, 192, 1);
}

.result {
  font-size: 1.3rem;
  padding: 20px 22px;
  border-radius: 14px;
  background-color: #2b2b2b;
  border: 1.8px solid #444;
  color: #cfd8f7;
  font-weight: 600;
  letter-spacing: 0.01em;
  text-align: center;

  /* Fixes for size and alignment */
  min-height: 62px;
  max-height: 62px;
  line-height: 1.4;
  display: flex;
  align-items: center;
  justify-content: center;
  word-break: break-word;
  user-select: text;
  box-shadow: inset 0 0 10px rgba(74, 144, 226, 0.3);
  transition: background-color 0.3s ease;
}

.result.error {
  background-color: #5b2a2a;
  border-color: #a63838;
  color: #ff6b6b;
  box-shadow: inset 0 0 10px rgba(255, 107, 107, 0.5);
}

@media (max-width: 480px) {
  .currency-selectors {
    flex-direction: column;
  }
  .switch-button {
    align-self: center;
    margin: 12px 0;
  }
}