:root {
  color-scheme: light;
  --bg: #ffffff;
  --panel: #ffffff;
  --ink: #1f1f1f;
  --muted: #5f5f5f;
  --border: #e0e0e0;
  --accent: #2f6f5f;
  --accent-soft: #e6f2ef;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
  --radius: 14px;
  --font-body: "Noto Sans", "Segoe UI", system-ui, sans-serif;
  --font-mono: "SF Mono", "Menlo", "Consolas", monospace;
  --input-bg: #fbfaf7;
}

@media (prefers-color-scheme: dark) {
  :root {
    color-scheme: dark;
    --bg: #343a40;
    --panel: #3d4349;
    --ink: #e9ecef;
    --muted: #c2c7cd;
    --border: #5c6165;
    --accent: #84b2ff;
    --accent-soft: #2f3a4a;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.35);
    --input-bg: #2e343a;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--bg);
  font-family: var(--font-body);
  line-height: 1.5;
}

h1 {
  margin: 0 0 8px;
  font-size: 2rem;
  letter-spacing: -0.02em;
}

h2 {
  margin: 0 0 10px;
  font-size: 1.25rem;
}

p {
  margin: 0 0 12px;
}

p.lead {
  color: var(--muted);
  max-width: 70ch;
}

label {
  font-weight: 600;
  display: block;
  margin-bottom: 6px;
}

input[type="text"],
input[type="url"],
input[type="search"],
input[type="email"],
input[type="number"],
textarea,
select {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: calc(var(--radius) - 4px);
  padding: 10px 12px;
  font-size: 0.95rem;
  font-family: var(--font-mono);
  background: var(--input-bg);
  color: var(--ink);
}

textarea {
  min-height: 90px;
  resize: vertical;
}

button {
  border: 1px solid var(--border);
  background: var(--accent-soft);
  color: var(--accent);
  padding: 8px 14px;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

button:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.12);
}

button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}