@import url("https://fonts.googleapis.com/css2?family=Playfair+Display:wght@500;600&family=Work+Sans:wght@300;400;500;600&display=swap");

:root {
  color-scheme: dark;
  --bg: #111315;
  --bg-alt: #1a1d20;
  --ink: #f2f2ee;
  --muted: #a0a4a8;
  --accent: #6fa36f;
  --accent-soft: #6fa36f;
  --card: #1a1d20;
  --shadow: none;
  --radius-lg: 0px;
  --radius-sm: 0px;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Work Sans", "Gill Sans", "Trebuchet MS", sans-serif;
  color: var(--ink);
  background: var(--bg);
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 20px 40px;
  display: grid;
  gap: 28px;
}

.hero {
  display: grid;
  gap: 14px;
}

h1 {
  font-family: "Playfair Display", "Times New Roman", serif;
  font-size: clamp(2.4rem, 3vw, 3.6rem);
  margin: 0;
  font-weight: 600;
}

.lead {
  font-size: 1rem;
  color: var(--muted);
  max-width: 520px;
  margin: 0;
}

.input-card {
  background: var(--card);
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  display: grid;
  gap: 12px;
  width: 100%;
  border: 1px solid var(--ink);
}

.input-card label {
  font-weight: 600;
  color: var(--ink);
}

.input-row {
  display: flex;
  align-items: center;
  gap: 12px;
}

.input-row input {
  flex: 1;
  border: 1px solid var(--ink);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--bg-alt);
  color: var(--ink);
}

.input-row input:focus {
  outline: 2px solid var(--accent);
  border-color: transparent;
}

.unit {
  color: var(--muted);
}

.hint {
  margin: 0;
  font-size: 0.85rem;
  color: var(--muted);
}

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

.zone {
  background: var(--card);
  border-radius: var(--radius-lg);
  padding: 16px 18px;
  box-shadow: var(--shadow);
  display: grid;
  gap: 10px;
  border: 1px solid var(--ink);
}

.zone-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-weight: 600;
}

.zone-number {
  color: var(--accent);
}

.zone-range {
  font-size: 1.05rem;
}

.zone-desc {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

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

@media (max-width: 720px) {
  .page {
    padding: 40px 16px 32px;
  }

  .input-card {
    width: 100%;
  }
}

@media (min-width: 720px) {
  .zones {
    grid-template-columns: repeat(2, 1fr);
  }
}