:root {
  --ink: #14181f;
  --paper: #f6f1e8;
  --card: #fffdf8;
  --line: #d9d0c2;
  --accent: #9a3b22;
  --muted: #5c564c;
  --ok: #2f6f4e;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
body {
  font-family: "Iwanami", "Source Han Serif SC", "Noto Serif SC", "Georgia", serif;
  background: var(--paper);
  color: var(--ink);
  line-height: 1.55;
}
a { color: var(--accent); }
header, footer {
  max-width: 980px;
  margin: 0 auto;
  padding: 1.2rem 1.4rem;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
}
header a.brand {
  color: var(--ink);
  text-decoration: none;
  font-weight: 700;
  letter-spacing: 0.04em;
}
nav { display: flex; gap: 1rem; flex-wrap: wrap; font-size: 0.95rem; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--ink); }
main { max-width: 980px; margin: 0 auto; padding: 0 1.4rem 3rem; }
h1 { font-size: 2.4rem; line-height: 1.15; margin: 0.4rem 0 1rem; }
h2 { font-size: 1.35rem; margin-top: 2rem; }
.lede { font-size: 1.2rem; color: var(--muted); max-width: 40rem; }
.hero {
  padding: 2.5rem 0 1rem;
  border-bottom: 1px solid var(--line);
  margin-bottom: 2rem;
}
.row { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.2rem 1.3rem;
}
.price { font-size: 2rem; margin: 0.4rem 0; }
.btn {
  display: inline-block;
  background: var(--ink);
  color: var(--paper);
  text-decoration: none;
  padding: 0.7rem 1.1rem;
  border-radius: 999px;
  border: 0;
  cursor: pointer;
  font-family: inherit;
  font-size: 1rem;
}
.btn.secondary { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
.btn.google { background: #fff; color: #1f1f1f; border: 1px solid #747775; }
.notice { color: var(--muted); font-size: 0.95rem; }
.ok { color: var(--ok); }
footer { color: var(--muted); font-size: 0.9rem; border-top: 1px solid var(--line); }
.legal p { max-width: 42rem; }
code { font-family: ui-monospace, monospace; font-size: 0.9em; }
label { display: block; margin: 0.7rem 0 0.25rem; color: var(--muted); }
input[type="email"], input[type="password"], input[type="text"] {
  width: 100%;
  max-width: 24rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  background: #fff;
}
.auth-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 1rem; }
.tabs { display: flex; gap: 0.5rem; margin: 0 0 1rem; }
.tabs button { background: transparent; color: var(--ink); border: 1px solid var(--ink); }
.tabs button.active { background: var(--ink); color: var(--paper); }
.err { color: var(--accent); }
@media (max-width: 640px) {
  h1 { font-size: 1.8rem; }
  header { flex-direction: column; }
}