:root {
  --bg: #060816;
  --bg-2: #0b1124;
  --surface: rgba(11, 17, 36, 0.76);
  --surface-strong: rgba(14, 23, 48, 0.96);
  --text: #eef3ff;
  --muted: #8c9abb;
  --line: rgba(126, 150, 206, 0.18);
  --shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  --accent: #5ad1ff;
  --accent-2: #7b61ff;
  --accent-soft: rgba(90, 209, 255, 0.18);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Space Grotesk", sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(90, 209, 255, 0.18), transparent 28%),
    radial-gradient(circle at 85% 15%, rgba(123, 97, 255, 0.16), transparent 24%),
    linear-gradient(160deg, #040611, var(--bg) 42%, var(--bg-2));
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.028) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.028) 1px, transparent 1px);
  background-size: 42px 42px;
  mask-image: radial-gradient(circle at center, black 48%, transparent 100%);
}

.page {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
  padding: 56px 0 72px;
}

.hero {
  margin-bottom: 28px;
}

.eyebrow {
  margin: 0 0 12px;
  text-transform: uppercase;
  letter-spacing: 0.24em;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-family: "Sora", sans-serif;
  font-size: clamp(3.5rem, 10vw, 7rem);
  line-height: 0.9;
  font-weight: 800;
  letter-spacing: -0.06em;
  max-width: 8ch;
}

.intro {
  width: min(620px, 100%);
  margin: 16px 0 0;
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--muted);
}

.card {
  display: grid;
  grid-template-columns: minmax(280px, 360px) 1fr;
  gap: 20px;
}

.form,
.result {
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: var(--surface);
  backdrop-filter: blur(20px);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.form::before,
.result::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(255, 255, 255, 0.05), transparent 35%);
  pointer-events: none;
}

.form {
  display: grid;
  gap: 16px;
  align-content: start;
}

.field {
  display: grid;
  gap: 8px;
}

.field span {
  font-size: 0.88rem;
  font-weight: 700;
  color: #c8d5f3;
}

input,
select,
button {
  font: inherit;
}

input,
select {
  width: 100%;
  padding: 14px 16px;
  border-radius: 16px;
  border: 1px solid var(--line);
  background: var(--surface-strong);
  color: var(--text);
  outline: none;
}

input:focus,
select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.amount-input-wrap {
  position: relative;
}

.amount-currency-select {
  position: absolute;
  top: 50%;
  left: 16px;
  transform: translateY(-50%);
  width: 104px;
  padding: 0;
  padding-right: 18px;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--accent);
  font-size: 0.88rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  z-index: 1;
  appearance: none;
  box-shadow: none;
  cursor: pointer;
}

.amount-currency-select:focus {
  box-shadow: none;
}

.amount-input-wrap::after {
  content: "▾";
  position: absolute;
  top: 50%;
  left: 100px;
  transform: translateY(-52%);
  color: var(--muted);
  font-size: 0.78rem;
  pointer-events: none;
}

.amount-input-wrap input {
  padding-left: 130px;
}

button {
  margin-top: 4px;
  padding: 16px 20px;
  border: 0;
  border-radius: 999px;
  background: linear-gradient(135deg, var(--accent), #83b0ff 56%, var(--accent-2));
  color: #03111c;
  font-weight: 700;
  letter-spacing: 0.02em;
  cursor: pointer;
  transition: transform 140ms ease, box-shadow 140ms ease;
  box-shadow: 0 18px 36px rgba(90, 209, 255, 0.22);
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 24px 42px rgba(90, 209, 255, 0.26);
}

button:focus-visible {
  outline: 0;
  box-shadow: 0 0 0 4px var(--accent-soft), 0 18px 36px rgba(90, 209, 255, 0.22);
}

button:disabled {
  cursor: wait;
  opacity: 0.78;
  transform: none;
  box-shadow: 0 12px 24px rgba(90, 209, 255, 0.16);
}

.range-buttons {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
}

.range-button {
  margin-top: 0;
  padding: 14px 12px;
  border: 1px solid var(--line);
  border-radius: 16px;
  background: rgba(14, 23, 48, 0.88);
  color: #c8d5f3;
  box-shadow: none;
}

.range-button:hover {
  transform: translateY(0);
  box-shadow: 0 0 0 1px rgba(90, 209, 255, 0.22);
}

.range-button:focus-visible {
  box-shadow: 0 0 0 4px var(--accent-soft);
}

.range-button.is-active {
  border-color: rgba(90, 209, 255, 0.65);
  background: linear-gradient(135deg, rgba(90, 209, 255, 0.18), rgba(123, 97, 255, 0.26));
  color: var(--text);
  box-shadow: inset 0 0 0 1px rgba(90, 209, 255, 0.22), 0 18px 30px rgba(32, 86, 140, 0.24);
}

.result {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 380px;
  background:
    radial-gradient(circle at top right, rgba(90, 209, 255, 0.12), transparent 34%),
    var(--surface);
}

.result-label {
  margin: 0 0 14px;
  font-size: 0.9rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.result-value {
  margin: 0;
  font-size: var(--result-size, clamp(3rem, 9vw, 7rem));
  line-height: 0.9;
  font-weight: 800;
  letter-spacing: -0.05em;
  white-space: nowrap;
  font-family: "Sora", sans-serif;
}

.result-meta {
  margin: 18px 0 0;
  width: 100%;
}

.result-meta-empty {
  margin: 0;
  font-size: 1rem;
  line-height: 1.6;
  color: var(--muted);
  max-width: 55ch;
}

.result-list {
  display: grid;
  gap: 10px;
}

.result-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 10px;
  border-top: 1px solid var(--line);
}

.result-row-label {
  font-size: 0.82rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.result-row-value {
  text-align: right;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.result.loading .result-value,
.result.loading .result-meta {
  opacity: 0.72;
}

@media (max-width: 820px) {
  .page {
    padding-top: 28px;
  }

  .card {
    grid-template-columns: 1fr;
  }

  .result {
    min-height: 300px;
  }
}

@media (max-width: 560px) {
  .page {
    width: min(100% - 20px, 1100px);
    padding-bottom: 40px;
  }

  .form,
  .result {
    padding: 20px;
    border-radius: 24px;
  }

  .amount-currency-select {
    width: 96px;
    left: 14px;
  }

  .amount-input-wrap::after {
    left: 92px;
  }

  .amount-input-wrap input {
    padding-left: 120px;
  }

  .range-buttons {
    grid-template-columns: 1fr;
  }
}