:root {
  color-scheme: light;
  --card-bg: #ffffff;
  --card-border: rgba(0, 0, 0, 0.08);
  --accent: #1b6f5a;
  --accent-dark: #0d4c3e;
  --text-muted: #4b4b4b;
  --shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background-image: linear-gradient(rgba(255, 255, 255, 0.92), rgba(255, 255, 255, 0.92)),
    url("./background.jpeg");
  background-size: cover;
  background-attachment: fixed;
  background-position: center;
  color: #1d1d1d;
}

.page {
  min-height: 100vh;
  padding: 3rem 1.5rem 4rem;
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 2rem;
}

.page__intro {
  text-align: center;
  color: var(--text-muted);
}

.page__intro h1 {
  margin-bottom: 0.5rem;
  color: #0e231c;
}

.calc-card {
  background-color: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 18px;
  padding: 1.75rem;
  box-shadow: var(--shadow);
}

.calc-card h2 {
  margin-top: 0;
  color: var(--accent-dark);
}

.calc-form {
  display: grid;
  gap: 1rem;
}

.field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  font-weight: 600;
}

.field input {
  font: inherit;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  border: 1px solid rgba(0, 0, 0, 0.2);
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.field input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(27, 111, 90, 0.2);
}

button {
  border: none;
  border-radius: 999px;
  padding: 0.8rem 1.6rem;
  font: inherit;
  font-weight: 600;
  color: #ffffff;
  background: linear-gradient(135deg, var(--accent), var(--accent-dark));
  cursor: pointer;
  transition: opacity 0.2s ease, transform 0.1s ease;
}

button:hover {
  opacity: 0.92;
}

button:active {
  transform: scale(0.98);
}

.result {
  min-height: 1.5rem;
  margin: 0;
  font-weight: 600;
}

.result[data-state="pending"] {
  color: #7c5a00;
}

.result[data-state="error"] {
  color: #c0392b;
}

.result[data-state="success"] {
  color: var(--accent-dark);
}

@media (max-width: 600px) {
  .calc-card {
    padding: 1.25rem;
  }
}