:root {
  color-scheme: light dark;
  --bg: #fafafa;
  --fg: #1a1a1a;
  --border: #ddd;
  --accent: #b3261e;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1a1a1a;
    --fg: #f0f0f0;
    --border: #3a3a3a;
    --accent: #ff6b60;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  display: flex;
  justify-content: center;
  padding: 2rem 1rem;
}

main {
  width: 100%;
  max-width: 640px;
}

h1 {
  font-size: 1.4rem;
  margin-bottom: 0.25rem;
}

h2 {
  font-size: 1.1rem;
  margin: 1.5rem 0 0.5rem;
}

h3 {
  font-size: 0.95rem;
  margin: 1.2rem 0 0.4rem;
}

p, li {
  font-size: 0.9rem;
  line-height: 1.5;
}

ul, ol {
  padding-left: 1.25rem;
  margin: 0.5rem 0 1.25rem;
}

li {
  margin-bottom: 0.3rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 1rem;
}

th, td {
  text-align: left;
  padding: 0.4rem 0.3rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
}

th:last-child, td:last-child { text-align: right; }

#guide {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

#plan {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

#summary {
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

#plan p {
  margin: 0.5rem 0;
}

.notice {
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  padding: 0.75rem 1rem;
  margin: 1rem 0;
  border: 1px solid var(--border);
}

.notice h3 {
  margin-top: 0;
}

.copy-block {
  position: relative;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
  margin-top: 0.5rem;
}

.copy-btn {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  font: inherit;
  font-size: 0.8rem;
  padding: 0.25rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 6px;
  background: var(--bg);
  color: var(--fg);
  cursor: pointer;
}

.copy-block ul {
  margin: 0;
  padding-right: 3.5rem;
}

table.guide-table td:last-child {
  font-weight: 600;
}

tr.total-row td {
  border-top: 1px solid var(--border);
  border-bottom: none;
  padding-top: 0.6rem;
}

#holdings h3 {
  color: #0d6efd;
  margin: 1.5rem 0 0.5rem;
}

@media (prefers-color-scheme: dark) {
  #holdings h3 {
    color: #6ea8fe;
  }
}

table.holdings-table {
  font-size: 0.85rem;
}

#holdings h2 {
  text-align: center;
  margin-top: 0;
}

table.holdings-table td:nth-child(2) {
  text-align: left;
}

.note {
  color: #888;
  font-size: 0.8rem;
  line-height: 1.4;
}

details.calc {
  margin-top: 0.5rem;
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.75rem 1rem;
}

details.calc summary {
  cursor: pointer;
  font-weight: 600;
  font-size: 0.9rem;
}

details.calc + details.calc {
  border-radius: 0;
  border-top: none;
  margin-top: 0;
}

details.calc:first-of-type {
  border-radius: 8px 8px 0 0;
}

details.calc:last-of-type {
  border-radius: 0 0 8px 8px;
}