/* Setup */
:root {
  --bg-body: #0f172a;
  --bg-card: #1e293b;
  --primary: #6366f1;
  --primary-hover: #818cf8;
  --text-main: #f8fafc;
  --text-muted: #94a3b8;
  --border: #334155;
  --input-bg: #0f172a;
  --success: #22c55e;
  --error: #ef4444;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family:
    "Inter",
    -apple-system,
    sans-serif;
}

body {
  background-color: var(--bg-body);
  background-image: radial-gradient(circle at top right, #1e1b4b, transparent);
  color: var(--text-main);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  padding: 20px;
}

/* Główna karta */
.converter-card {
  background: var(--bg-card);
  width: 100%;
  max-width: 600px;
  padding: 2.5rem;
  border-radius: 24px;
  border: 1px solid var(--border);
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
}

header {
  margin-bottom: 2rem;
  text-align: center;
}

header h1 {
  font-size: 1.8rem;
  font-weight: 800;
  letter-spacing: -0.025em;
  background: linear-gradient(to right, #818cf8, #c084fc);
  background-clip: text;
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

header p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-top: 0.5rem;
}

/* Grupy wejściowe */
.input-group,
.select-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
  text-align: center;
}

label {
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

input {
  background: var(--input-bg);
  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 1rem;
  border-radius: 12px;
  font-size: 1.1rem;
  transition: all 0.2s ease;
  outline: none;
}

input:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
}

/* Select */
.selection-container {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 24px;
  margin-bottom: 2rem;
  width: 100%;
  overflow: hidden;
}

.select-group {
  flex: 1;
  margin-bottom: 0;
  min-width: 0;
}

select {
  appearance: none;
  -webkit-appearance: none;
  -moz-appearance: none;

  width: 100%;
  background-color: var(--input-bg);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%236366f1'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1.2rem;

  border: 1px solid var(--border);
  color: var(--text-main);
  padding: 1rem 2.5rem 1rem 1rem;
  border-radius: 12px;
  font-size: 1rem;
  transition: all 0.2s ease;
  cursor: pointer;
}

select:hover:not(:disabled),
select:focus:not(:disabled),
select:active:not(:disabled) {
  border-color: var(--primary);
  box-shadow: 0 0 0 4px rgba(99, 102, 241, 0.2);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 24 24' stroke='%23818cf8'%3E%3Cpath stroke-linecap='round' stroke-linejoin='round' stroke-width='2' d='M19 9l-7 7-7-7'%3E%3C/path%3E%3C/svg%3E");
}

select option {
  background-color: var(--bg-card);
  color: var(--text-main);
  padding: 12px;
}

/* Przycisk Swap */
#swapBtn {
  background: var(--border);
  border: none;
  color: var(--text-main);
  width: 48px;
  height: 48px;
  border-radius: 12px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
  margin-bottom: 0;

  align-self: center;
  margin: -10px 0;
  z-index: 2;
  transform: rotate(90deg);
}

#swapBtn:hover:not(:disabled) {
  background: var(--primary);
  transform: rotate(270deg);
}

#swapBtn .icon {
  font-size: 1.4rem;
}

/* Disabled states */
input:disabled,
select:disabled,
#swapBtn:disabled {
  background: var(--border);
  color: var(--text-muted);
  cursor: not-allowed;
  box-shadow: none;
}

/* Sekcja Wyniku */
.result-area {
  display: block;
  background: linear-gradient(
    135deg,
    rgba(99, 102, 241, 0.1),
    rgba(192, 132, 252, 0.1)
  );
  padding: 2rem;
  border-radius: 16px;
  text-align: center;
  border: 1px dashed var(--primary);
}

#resultValue {
  display: block;
  font-size: 2.5rem;
  font-weight: 800;
  color: var(--text-main);
}

#resultCurrency {
  color: var(--primary-hover);
  font-weight: 600;
  font-size: 1.1rem;
}

/* Stopka karty */
footer {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--text-muted);
  font-size: 0.8rem;
}

/* Responsywne style */
@media (min-width: 768px) {
  .selection-container {
    flex-direction: row;
    align-items: flex-end;
    gap: 12px;
  }

  #swapBtn {
    align-self: inherit;
    margin: 0;
    z-index: 2;
    transform: rotate(0);
  }

  #swapBtn:hover:not(:disabled) {
    transform: rotate(180deg);
  }

  .select-group, .input-group {
    text-align: left;
  }
}