:root {
  --oxford-900: #001225;
  --oxford-800: #02203d;
  --oxford-700: #062b52;
  --panel: rgba(8, 28, 56, 0.82);
  --panel-soft: rgba(11, 35, 68, 0.72);
  --line: rgba(110, 142, 189, 0.32);
  --line-strong: rgba(170, 110, 232, 0.46);
  --text: #e7f2ff;
  --muted: #a8c0de;
  --error: #fecdd3;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: 'Space Grotesk', 'Segoe UI', sans-serif;
  color: var(--text);
  background:
    radial-gradient(1100px 600px at 10% -5%, rgba(92, 184, 255, 0.2), transparent 66%),
    radial-gradient(900px 520px at 88% -8%, rgba(139, 92, 246, 0.24), transparent 64%),
    radial-gradient(920px 520px at 52% 110%, rgba(239, 68, 68, 0.15), transparent 70%),
    linear-gradient(150deg, var(--oxford-900), var(--oxford-800) 48%, var(--oxford-700));
  min-height: 100vh;
}

.page {
  max-width: 980px;
  margin: 0 auto;
  padding: 28px 20px 40px;
  position: relative;
}

.page::before {
  content: '';
  position: absolute;
  inset: 12px;
  border-radius: 18px;
  border: 1px solid rgba(168, 192, 222, 0.14);
  pointer-events: none;
}

.hero {
  margin-bottom: 16px;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 4.6vw, 2.75rem);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

p {
  color: var(--muted);
  margin-top: 0;
}

.panel {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  padding: 18px;
  background: linear-gradient(160deg, var(--panel), var(--panel-soft));
  border: 1px solid var(--line);
  border-radius: 14px;
  box-shadow: 0 16px 38px rgba(0, 10, 24, 0.42);
  backdrop-filter: blur(4px);
}

label,
fieldset {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 0.96rem;
}

fieldset {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 10px;
}

legend {
  color: #c3d7ef;
  padding: 0 6px;
}

.row {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.check {
  flex-direction: row;
  align-items: center;
  gap: 7px;
  color: #dceaff;
}

input,
select,
button {
  width: 100%;
  padding: 11px 12px;
  border: 1px solid var(--line);
  border-radius: 10px;
  background: rgba(4, 20, 43, 0.78);
  color: var(--text);
}

input:focus,
select:focus {
  outline: none;
  border-color: var(--line-strong);
  box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.24);
}

button {
  grid-column: 1 / -1;
  cursor: pointer;
  border-color: rgba(92, 184, 255, 0.74);
  background: linear-gradient(130deg, rgba(33, 84, 153, 0.72), rgba(111, 70, 214, 0.58));
  font-weight: 700;
  letter-spacing: 0.01em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
}

button:disabled {
  opacity: 0.72;
  cursor: not-allowed;
}

.spinner {
  width: 15px;
  height: 15px;
  border: 2px solid rgba(231, 242, 255, 0.34);
  border-top-color: #fff;
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}

.loading-box,
.result,
.error {
  margin-top: 16px;
  padding: 14px;
  border-radius: 11px;
  overflow: auto;
}

.loading-box {
  border: 1px solid rgba(139, 92, 246, 0.38);
  background: linear-gradient(160deg, rgba(21, 40, 80, 0.75), rgba(34, 24, 72, 0.54));
}

.loading-box p {
  margin: 10px 0 0;
}

.loading-track {
  width: 100%;
  height: 8px;
  border-radius: 999px;
  overflow: hidden;
  background: rgba(168, 192, 222, 0.14);
}

.loading-bar {
  display: block;
  width: 38%;
  height: 100%;
  background: linear-gradient(90deg, rgba(92, 184, 255, 0.8), rgba(139, 92, 246, 0.8), rgba(239, 68, 68, 0.75));
  border-radius: inherit;
  animation: loading-slide 1.3s ease-in-out infinite;
}

.result,
.error {
  border: 1px solid var(--line);
  background: rgba(4, 20, 43, 0.72);
}

.error {
  border-color: rgba(239, 68, 68, 0.62);
  color: var(--error);
}

.hidden {
  display: none;
}

.reveal {
  animation: reveal 0.32s ease-out;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes loading-slide {
  0% {
    transform: translateX(-110%);
  }
  60% {
    transform: translateX(140%);
  }
  100% {
    transform: translateX(140%);
  }
}

@keyframes reveal {
  from {
    opacity: 0;
    transform: translateY(7px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 780px) {
  .panel {
    grid-template-columns: 1fr;
  }

  .page {
    padding: 18px 14px 28px;
  }
}