:root {
  --bg: #0f1419;
  --card: #1a2332;
  --text: #e8eef5;
  --muted: #9aa8b8;
  --accent: #3dd68c;
  --error: #ff6b6b;
  --border: #2a3646;
  font-family: "Segoe UI", system-ui, sans-serif;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}

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

.wrap {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 1.25rem;
}

.top {
  padding: 2rem 0 1rem;
  border-bottom: 1px solid var(--border);
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.25rem;
}

.subtitle {
  color: var(--muted);
  margin: 0;
}

main {
  padding: 2rem 0 3rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.5rem;
}

.card-inner {
  background: #121a24;
  border-radius: 8px;
  padding: 1rem;
  margin-top: 1rem;
}

.muted {
  margin-top: 1.5rem;
  color: var(--muted);
}

.muted h2 {
  color: var(--text);
  font-size: 1.1rem;
}

.intro {
  margin-top: 0;
  color: var(--muted);
}

fieldset {
  border: none;
  padding: 0;
  margin: 1.25rem 0;
}

legend {
  font-weight: 600;
  padding: 0;
  margin-bottom: 0.75rem;
}

label {
  display: block;
  font-size: 0.9rem;
  color: var(--muted);
  margin-bottom: 1rem;
}

input,
select,
textarea {
  width: 100%;
  margin-top: 0.35rem;
  padding: 0.6rem 0.75rem;
  border-radius: 8px;
  border: 1px solid var(--border);
  background: #0f1419;
  color: var(--text);
}

.row.two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 600px) {
  .row.two {
    grid-template-columns: 1fr;
  }
}

.hint {
  font-size: 0.85rem;
  color: var(--muted);
}

.check {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  margin: 1rem 0;
}

.check input {
  width: auto;
  margin-top: 0.2rem;
}

.btn-primary {
  display: inline-block;
  width: 100%;
  padding: 0.85rem 1rem;
  border: none;
  border-radius: 10px;
  background: linear-gradient(135deg, #2dd4a3, #1fa776);
  color: #042015;
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
}

.btn-primary:hover {
  filter: brightness(1.05);
}

.banner {
  padding: 0.85rem 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}

.notice {
  background: #14332a;
  border: 1px solid #1f6b54;
}

.banner-error {
  background: #331418;
  border: 1px solid #8b2e33;
}

.banner ul {
  margin: 0;
  padding-left: 1.2rem;
}

.summary .small {
  font-size: 0.8rem;
  color: var(--muted);
  margin-bottom: 0;
}

.code {
  overflow-x: auto;
  padding: 1rem;
  background: #0f1419;
  border-radius: 8px;
  font-size: 0.75rem;
  border: 1px solid var(--border);
}

.footer {
  padding: 2rem 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  text-align: center;
}

#monthly-display {
  color: var(--accent);
  font-size: 1.25rem;
}