:root {
  --bg: #faf8f4;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5d636b;
  --border: #ddd8cf;
  --accent: #2f6f5e;
  --accent-text: #ffffff;
  --error-bg: #fdecea;
  --error-text: #8a1c12;
  --ok-bg: #e7f4ee;
  --ok-text: #1d5a44;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16181b;
    --surface: #1f2226;
    --text: #e8e6e3;
    --muted: #a3a8ae;
    --border: #353a40;
    --accent: #6cc2a6;
    --accent-text: #0f1a16;
    --error-bg: #3a1d1a;
    --error-text: #f4b4ab;
    --ok-bg: #173127;
    --ok-text: #a6e3cc;
    color-scheme: dark;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.55 Georgia, 'Iowan Old Style', 'Times New Roman', serif;
}

header {
  padding: 20px 16px;
  border-bottom: 1px solid var(--border);
}
header .inner, main { max-width: 34rem; margin: 0 auto; }
header .inner { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }
.brand { font-size: 1.1rem; font-weight: bold; color: var(--text); text-decoration: none; }
.brand small { display: block; font-weight: normal; color: var(--muted); font-size: .85rem; }
nav { display: flex; gap: 16px; font-family: system-ui, sans-serif; font-size: .9rem; }

main { padding: 32px 16px 64px; }

h1 { font-size: 1.6rem; line-height: 1.25; margin: 0 0 .5rem; }
h2 { font-size: 1.2rem; margin: 2rem 0 .5rem; }
p.lead { color: var(--muted); margin-top: 0; }

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

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 24px;
  margin: 24px 0;
}

form, .ui { font-family: system-ui, -apple-system, 'Segoe UI', sans-serif; font-size: 1rem; }
label { display: block; font-weight: 600; font-size: .9rem; margin: 16px 0 6px; }
label .hint { font-weight: normal; color: var(--muted); }
input {
  width: 100%;
  padding: 10px 12px;
  font: inherit;
  color: var(--text);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
}
input:focus { outline: 2px solid var(--accent); outline-offset: 1px; }
input[readonly] { color: var(--muted); }

button, .button {
  display: inline-block;
  margin-top: 20px;
  padding: 10px 18px;
  font: 600 1rem system-ui, sans-serif;
  border-radius: 6px;
  border: 1px solid var(--accent);
  background: var(--accent);
  color: var(--accent-text);
  cursor: pointer;
  text-decoration: none;
}
button.secondary { background: transparent; color: var(--accent); }
button.link { background: none; border: none; padding: 0; margin: 0; color: var(--accent); font-weight: normal; text-decoration: underline; }
button:disabled { opacity: .6; cursor: default; }
.wide { width: 100%; }

.divider { display: flex; align-items: center; gap: 12px; color: var(--muted); font-size: .85rem; margin: 20px 0 0; }
.divider::before, .divider::after { content: ''; flex: 1; border-top: 1px solid var(--border); }

.tabs { display: flex; gap: 4px; border-bottom: 1px solid var(--border); margin-bottom: 8px; }
.tabs button {
  margin: 0; border: none; border-bottom: 3px solid transparent; border-radius: 0;
  background: none; color: var(--muted); padding: 8px 12px;
}
.tabs button[aria-selected='true'] { color: var(--text); border-bottom-color: var(--accent); }

.message { padding: 12px 14px; border-radius: 6px; font-family: system-ui, sans-serif; font-size: .95rem; }
.message.error { background: var(--error-bg); color: var(--error-text); }
.message.ok { background: var(--ok-bg); color: var(--ok-text); }

.meta { color: var(--muted); font-family: system-ui, sans-serif; font-size: .9rem; }
.small { font-size: .9rem; }

.prose li { margin: .35rem 0; }
footer {
  max-width: 34rem;
  margin: 0 auto;
  padding: 24px 16px 40px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font: .85rem system-ui, sans-serif;
}