:root {
  --ink: #0f1b2a;
  --muted: #5a6f86;
  --sand: #edf5ff;
  --accent: #2374d8;
  --card: #f8fbff;
  --line: rgba(35, 68, 108, 0.14);
  --glow: rgba(35, 116, 216, 0.14);
}

* {
  box-sizing: border-box;
}

html {
  background:
    radial-gradient(circle at 15% 20%, rgba(110, 171, 255, 0.2), transparent 55%),
    radial-gradient(circle at 80% 10%, rgba(132, 220, 255, 0.2), transparent 50%),
    linear-gradient(160deg, #f3f9ff 0%, #dfefff 55%, #edf7ff 100%);
  background-color: #eaf4ff;
}

body {
  margin: 0;
  min-height: 100vh;
  min-height: 100dvh;
  font-family: "Space Grotesk", system-ui, sans-serif;
  color: var(--ink);
  background:
    radial-gradient(circle at 15% 20%, rgba(110, 171, 255, 0.2), transparent 55%),
    radial-gradient(circle at 80% 10%, rgba(132, 220, 255, 0.2), transparent 50%),
    linear-gradient(160deg, #f3f9ff 0%, #dfefff 55%, #edf7ff 100%);
  background-color: #eaf4ff;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 48px 20px;
}

.shell {
  width: min(580px, 100%);
  display: grid;
  gap: 32px;
}

h1 {
  margin: 0;
  font-family: "Fraunces", Georgia, serif;
  font-size: clamp(1.8rem, 3vw, 2.3rem);
  line-height: 1.05;
}

p {
  margin: 0;
  color: var(--muted);
  line-height: 1.5;
}

.stats {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.stat {
  padding: 16px;
  border-radius: 18px;
  background: var(--sand);
  border: 1px solid rgba(35, 68, 108, 0.1);
}

.stat.wide {
  grid-column: 1 / -1;
}

.stat span {
  display: block;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.stat strong {
  display: block;
  margin-top: 6px;
  font-size: 1.1rem;
  font-weight: 600;
}

.card {
  background: var(--card);
  border-radius: 32px;
  padding: 36px;
  border: 1px solid var(--line);
  box-shadow:
    0 30px 80px rgba(24, 25, 32, 0.12),
    0 0 40px var(--glow);
  display: flex;
  flex-direction: column;
  gap: 22px;
  animation: floatIn 0.8s ease;
}

@keyframes floatIn {
  from {
    opacity: 0;
    transform: translateY(16px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

label {
  display: block;
  font-weight: 600;
  margin-bottom: 8px;
}

#price-form {
  display: grid;
  gap: 18px;
}

.input-row {
  display: grid;
  gap: 12px;
}

input[type="number"] {
  width: 100%;
  padding: 14px 16px;
  border-radius: 14px;
  border: 1.5px solid var(--line);
  background: #fcfeff;
  font-size: 1rem;
  font-family: inherit;
}

input[type="number"]:focus {
  outline: 2px solid rgba(35, 116, 216, 0.35);
  border-color: var(--accent);
}

.helper {
  font-size: 0.9rem;
  color: var(--muted);
}

.result {
  border-radius: 18px;
  padding: 16px;
  border: 1px dashed rgba(35, 116, 216, 0.4);
  background: rgba(35, 116, 216, 0.08);
  color: var(--ink);
}

.result strong {
  font-size: 1.2rem;
}

.error {
  color: #b42318;
  font-size: 0.9rem;
}

.calculate-btn {
  border: 1px solid transparent;
  border-radius: 14px;
  padding: 12px 16px;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: #fff;
  background: var(--accent);
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease, background-color 0.15s ease;
}

.calculate-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 20px rgba(35, 116, 216, 0.28);
}

.calculate-btn:focus-visible {
  outline: 2px solid rgba(35, 116, 216, 0.4);
  outline-offset: 2px;
}

.calculate-btn:active {
  transform: translateY(0);
}

@media (prefers-reduced-motion: reduce) {
  .card {
    animation: none;
  }

  .calculate-btn {
    transition: none;
  }
}

@media (max-width: 720px) {
  body {
    background:
      radial-gradient(circle at 20% 12%, rgba(110, 171, 255, 0.22), transparent 58%),
      radial-gradient(circle at 85% 8%, rgba(132, 220, 255, 0.18), transparent 52%),
      linear-gradient(180deg, #f3f9ff 0%, #e3f1ff 58%, #edf7ff 100%);
    padding: 20px 14px;
    align-items: flex-start;
  }

  .shell {
    gap: 16px;
  }

  .card {
    border-radius: 22px;
    padding: 28px;
    gap: 16px;
  }

  h1 {
    font-size: 1.55rem;
  }

  p {
    font-size: 0.95rem;
  }

  .stats {
    grid-template-columns: 1fr;
    gap: 12px;
  }

  .stat {
    padding: 14px;
    border-radius: 14px;
  }

  .stat.wide {
    grid-column: auto;
  }

  .stat span {
    font-size: 0.68rem;
  }

  .stat strong {
    font-size: 1rem;
  }

  #price-form {
    gap: 14px;
  }

  .input-row {
    gap: 8px;
  }

  input[type="number"] {
    padding: 12px 14px;
    font-size: 16px;
  }

  .helper,
  .error {
    font-size: 0.85rem;
  }

  .result {
    padding: 14px;
    border-radius: 14px;
  }

  .result strong {
    font-size: 1.05rem;
  }

  .calculate-btn {
    padding: 12px 14px;
  }
}