:root {
  --bg: #fbfbf9;
  --fg: #1d1f21;
  --muted: #5a5f66;
  --accent: #1f5fa8;
  --border: #d7d9dc;
  --surface: #ffffff;
  --ok-bg: #e6f4ea;
  --ok-fg: #1e5b2e;
  --warn-bg: #fdf2dc;
  --warn-fg: #7a4b00;
  --err-bg: #fbe4e4;
  --err-fg: #8a1c1c;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #15171a;
    --fg: #e8e9eb;
    --muted: #a3a8af;
    --accent: #7fb2f0;
    --border: #353a40;
    --surface: #1d2024;
    --ok-bg: #173322;
    --ok-fg: #a8e0b6;
    --warn-bg: #3a2c10;
    --warn-fg: #f2cf8c;
    --err-bg: #3d1a1a;
    --err-fg: #f2b0b0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 1.0625rem;
  line-height: 1.6;
}

main, footer, .site-header {
  max-width: 40rem;
  margin: 0 auto;
  padding: 0 1rem;
}

main { padding-top: 1.5rem; padding-bottom: 2rem; }

.site-header { padding-top: 1rem; font-weight: 600; }
.site-header a { color: var(--fg); text-decoration: none; }

h1 { font-size: 2rem; line-height: 1.2; margin: 0.5rem 0; }
h2 { font-size: 1.35rem; margin-top: 2rem; }
h3 { font-size: 1.1rem; }

.tagline { color: var(--muted); font-size: 1.15rem; margin-top: 0; }
.small { font-size: 0.95rem; color: var(--muted); }

a { color: var(--accent); }

a:focus-visible, button:focus-visible, input:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

form { display: flex; flex-wrap: wrap; gap: 0.5rem; align-items: center; }
form > label { flex-basis: 100%; font-weight: 600; }

input[type="email"] {
  flex: 1 1 14rem;
  min-width: 0;
  font: inherit;
  padding: 0.6rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--surface);
  color: var(--fg);
}

button {
  font: inherit;
  font-weight: 600;
  padding: 0.6rem 1rem;
  border: 0;
  border-radius: 6px;
  background: var(--accent);
  color: var(--bg);
  cursor: pointer;
}

.hp {
  position: absolute;
  left: -10000px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.notice {
  display: none;
  padding: 0.75rem 1rem;
  border-radius: 6px;
  background: var(--ok-bg);
  color: var(--ok-fg);
}
.notice:target { display: block; }
#invalid { background: var(--warn-bg); color: var(--warn-fg); }
#error { background: var(--err-bg); color: var(--err-fg); }

.table-wrap { overflow-x: auto; margin: 1rem 0; }
table { border-collapse: collapse; width: 100%; font-size: 0.95rem; }
th, td { border: 1px solid var(--border); padding: 0.5rem; text-align: left; vertical-align: top; }
th { background: var(--surface); }
td a { overflow-wrap: anywhere; }

code { font-size: 0.95em; }

footer {
  border-top: 1px solid var(--border);
  padding-top: 1rem;
  padding-bottom: 2rem;
  color: var(--muted);
  font-size: 0.95rem;
}
footer nav { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; }