:root {
  --paper: #f3eee4;
  --ink: #1c1917;
  --muted: #78716c;
  --line: #e7e0d4;
  --card: #fffaf3;
  --copper: #9a3412;
  --copper-hover: #7c2d12;
  --teal: #0f766e;
  --danger: #b91c1c;
  --ok: #166534;
  --shadow: 0 10px 30px rgba(28, 25, 23, 0.08);
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Songti SC", "Noto Serif SC", serif;
  --sans: "Segoe UI", system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; min-height: 100%; background: var(--paper); color: var(--ink); font-family: var(--sans); }
body { min-height: 100dvh; }
a { color: var(--teal); }
button, input { font: inherit; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 20px 64px; }
.table-wrap { overflow-x: auto; }
.grant-cell { display: flex; gap: 6px; flex-wrap: wrap; align-items: center; }
.grant-cell .days { width: 72px; padding: 8px; }

.top {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 0 12px; gap: 12px;
}
.brand { font-family: var(--serif); font-size: 28px; letter-spacing: 0.04em; text-decoration: none; color: var(--ink); }
.nav { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.btn {
  border: 1px solid var(--line); background: var(--card); color: var(--ink);
  border-radius: 12px; padding: 8px 14px; cursor: pointer;
}
.btn:hover { border-color: #d6cbb8; }
.btn-primary { background: var(--copper); color: #fff7ed; border-color: var(--copper); }
.btn-primary:hover { background: var(--copper-hover); }
.btn-teal { background: var(--teal); color: #f0fdfa; border-color: var(--teal); }
.btn[disabled] { opacity: 0.55; cursor: not-allowed; }

.hero-card, .card {
  background: var(--card); border: 1px solid var(--line); border-radius: 12px;
  box-shadow: var(--shadow); padding: 28px;
}
.center { min-height: calc(100dvh - 40px); display: grid; place-items: center; padding: 24px; }
.login { width: min(420px, 100%); }
.login h1 { font-family: var(--serif); font-weight: 600; font-size: 32px; margin: 0 0 8px; }
.login p.lead { color: var(--muted); margin: 0 0 22px; }
label { display: block; font-size: 13px; color: var(--muted); margin: 12px 0 6px; }
input[type="text"], input[type="password"], input[type="number"] {
  width: 100%; padding: 11px 12px; border-radius: 12px; border: 1px solid var(--line);
  background: #fff; color: var(--ink);
}
.hint { margin: 16px 0 0; color: #a8a29e; font-size: 12px; line-height: 1.5; }
.err { color: var(--danger); font-size: 14px; min-height: 1.2em; margin: 10px 0 0; }
.ok { color: var(--ok); }

.grid { display: grid; gap: 16px; }
.plans { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
@media (max-width: 720px) { .plans { grid-template-columns: 1fr; } .brand { font-size: 22px; } }

h2 { font-family: var(--serif); font-size: 22px; margin: 8px 0 12px; }
.status-row { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-bottom: 1px solid var(--line); }
.status-row:last-child { border-bottom: 0; }
.price { font-size: 28px; font-family: var(--serif); }
.price s { color: var(--muted); font-size: 18px; margin-right: 8px; }
.sub { display: flex; gap: 8px; }
.sub input { flex: 1; font-family: ui-monospace, Consolas, monospace; font-size: 13px; }
details { margin-top: 12px; }
details summary { cursor: pointer; color: var(--teal); }
.warn { background: #fff7ed; border: 1px solid #fed7aa; color: #9a3412; padding: 10px 12px; border-radius: 12px; }

.mask {
  position: fixed; inset: 0; background: rgba(28, 25, 23, 0.46);
  display: grid; place-items: center; padding: 16px; z-index: 50;
}
.dialog {
  width: min(420px, 100%); background: var(--card); border-radius: 12px;
  border: 1px solid var(--line); padding: 18px 18px 20px; box-shadow: var(--shadow);
  position: relative;
}
.dialog.pay-dialog { width: min(560px, 100%); max-height: 90vh; overflow: auto; }
.pay-chain { margin: 10px 0 4px; }
.pay-chain-name { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.pay-opts { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 8px; }
.dialog h3 { font-family: var(--serif); margin: 0 20px 10px 0; }
.dialog-body { color: var(--ink); line-height: 1.65; }
.dialog-body p { margin: 0 0 8px; }
.purpose p { line-height: 1.75; margin: 0; max-width: 720px; }
.legal h3 { font-family: var(--serif); font-size: 17px; margin: 22px 0 8px; }
.legal p { line-height: 1.75; max-width: 720px; }
.close {
  position: absolute; top: 10px; right: 12px; border: 0; background: transparent;
  font-size: 22px; cursor: pointer; color: var(--muted);
}
.toast {
  position: fixed; bottom: 24px; left: 50%; transform: translateX(-50%);
  background: var(--ink); color: #fafaf9; padding: 8px 14px; border-radius: 999px;
  font-size: 13px; z-index: 60;
}
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { text-align: left; padding: 8px 6px; border-bottom: 1px solid var(--line); }
.actions { display: flex; gap: 8px; flex-wrap: wrap; margin-top: 14px; }
.muted { color: var(--muted); }

.help-layout {
  display: grid;
  grid-template-columns: minmax(160px, 1fr) 3fr;
  gap: 20px;
  align-items: start;
}
.help-side {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 10px 18px;
  position: sticky;
  top: 12px;
}
.help-nav { display: flex; flex-direction: column; gap: 4px; }
.help-group-title {
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.06em;
  margin: 12px 8px 6px;
}
.help-nav .help-group-title:first-child { margin-top: 0; }
.help-nav a {
  display: block;
  padding: 8px 12px;
  border-radius: 10px;
  color: var(--ink);
  text-decoration: none;
  font-size: 14px;
}
.help-nav a:hover { background: #f3eee4; }
.help-nav a.active { background: var(--copper); color: #fff7ed; }
.help-main { min-width: 0; }
@media (max-width: 720px) {
  .help-layout { grid-template-columns: 1fr; }
  .help-side { position: static; }
  .help-nav { flex-direction: row; flex-wrap: wrap; }
  .help-group-title { width: 100%; margin: 8px 4px 0; }
}
.help-sec { margin-bottom: 0; }
.help-sec h2, .help-sec h3 { scroll-margin-top: 18px; }
.help-sec h3 { font-family: var(--serif); font-size: 18px; margin: 28px 0 12px; }
.help-fig { margin: 0 0 22px; }
.help-fig img, .help-gallery img {
  display: block; width: 100%; max-width: 420px; height: auto;
  border-radius: 12px; border: 1px solid var(--line); background: #111;
}
.help-fig figcaption, .help-cap {
  margin: 8px 0 0; color: var(--ink); font-size: 15px; line-height: 1.65;
  max-width: 640px;
}
.help-gallery {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px; margin: 0 0 8px; max-width: 720px;
}
.help-gallery img { max-width: none; }
.help-sec p { line-height: 1.7; max-width: 640px; }