:root {
  color-scheme: light dark;
  --bg: #fafaf8; --fg: #1a1a1e; --muted: #55555f; --card: #ffffff; --line: #d8d8d2;
  --accent: #1f5fbf; --accent-fg: #ffffff; --ok-bg: #e7f4ea; --ok-fg: #14532d;
  --err-bg: #fdecec; --err-fg: #7f1d1d; --focus: #1f5fbf;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #121215; --fg: #f0f0ee; --muted: #a8a8b2; --card: #1c1c21; --line: #3a3a42;
    --accent: #7aa5f0; --accent-fg: #10131c; --ok-bg: #14331f; --ok-fg: #a6e3c0;
    --err-bg: #3d1616; --err-fg: #f3b4b4; --focus: #9dbcf6;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0; background: var(--bg); color: var(--fg); line-height: 1.55;
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  display: flex; flex-direction: column; min-height: 100vh;
}
main { flex: 1; width: 100%; max-width: 46rem; margin: 0 auto; padding: 1.25rem; }
a { color: var(--accent); }
a:hover { text-decoration-thickness: 2px; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; border-radius: 2px; }
.skip { position: absolute; left: -9999px; }
.skip:focus { position: static; padding: 0.5rem 1rem; display: inline-block; background: var(--card); }
header.site { border-bottom: 1px solid var(--line); background: var(--card); }
header.site nav {
  max-width: 46rem; margin: 0 auto; padding: 0.75rem 1.25rem;
  display: flex; align-items: baseline; gap: 1rem; flex-wrap: wrap;
}
.brand { font-weight: 700; font-size: 1.1rem; text-decoration: none; color: var(--fg); }
.nav-links { margin-left: auto; display: flex; gap: 1rem; align-items: baseline; }
.nav-user { color: var(--muted); font-size: 0.9rem; }
footer.site { border-top: 1px solid var(--line); color: var(--muted); font-size: 0.85rem; }
footer.site p { max-width: 46rem; margin: 0 auto; padding: 1rem 1.25rem; }
.card { background: var(--card); border: 1px solid var(--line); border-radius: 10px; padding: 1.25rem; margin: 1rem 0; }
.offer-list { list-style: none; padding: 0; margin: 1rem 0; display: grid; gap: 1rem; }
.muted { color: var(--muted); }
.price { font-weight: 600; }
.btn, button.btn {
  display: inline-block; background: var(--accent); color: var(--accent-fg); border: none;
  padding: 0.65rem 1.1rem; border-radius: 8px; font-size: 1rem; font-weight: 600;
  text-decoration: none; cursor: pointer;
}
.btn:hover { filter: brightness(1.08); text-decoration: none; }
.btn.secondary { background: transparent; color: var(--accent); border: 2px solid var(--accent); }
form.stacked { display: grid; gap: 1.1rem; margin-top: 1rem; }
label { display: block; font-weight: 600; margin-bottom: 0.25rem; }
.hint { color: var(--muted); font-weight: 400; font-size: 0.9rem; }
input[type="text"], input[type="email"], textarea {
  width: 100%; padding: 0.6rem 0.7rem; border: 1.5px solid var(--line); border-radius: 8px;
  background: var(--bg); color: var(--fg); font: inherit;
}
input[aria-invalid="true"], textarea[aria-invalid="true"] { border-color: var(--err-fg); }
.field-error { color: var(--err-fg); margin: 0.3rem 0 0; font-size: 0.95rem; }
.notice { border-radius: 8px; padding: 0.9rem 1.1rem; margin: 1rem 0; }
.notice p, .notice ul { margin: 0; }
.notice h2 { margin: 0 0 0.5rem; font-size: 1.05rem; }
.notice.ok { background: var(--ok-bg); color: var(--ok-fg); }
.notice.err { background: var(--err-bg); color: var(--err-fg); }
.notice.err a { color: inherit; }
table { width: 100%; border-collapse: collapse; margin-top: 1rem; }
th, td { text-align: left; padding: 0.6rem 0.5rem; border-bottom: 1px solid var(--line); vertical-align: top; }
th { font-size: 0.85rem; text-transform: uppercase; letter-spacing: 0.03em; color: var(--muted); }
.table-scroll { overflow-x: auto; }
.hp { position: absolute; left: -9999px; width: 1px; height: 1px; overflow: hidden; }
h1 { line-height: 1.2; letter-spacing: -0.01em; }
h2 { margin-top: 2rem; }
ol.steps { padding-left: 1.4rem; }
ol.steps li { margin-bottom: 0.5rem; }