:root {
  --navy: #061e41;
  --navy-soft: #0b2d59;
  --coral: #ff5b50;
  --sky: #23a5f7;
  --page: #eef2f7;
  --white: #ffffff;
  --tint: #eef6ff;
  --ink: #0d1f38;
  --muted: #5f7086;
  --line: #e2e9f1;
  --amber: #e5a52b;
  --amber-soft: #fdf5e4;
  --sheet: 880px;
}

* { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

/* ---------- top bar ---------- */

.topbar {
  background: var(--navy);
  color: var(--white);
}

.topbar-inner {
  max-width: var(--sheet);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  color: var(--white);
  text-decoration: none;
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.brand span { color: var(--coral); }

.topbar .back {
  color: #9fc0e6;
  text-decoration: none;
  font-size: 0.88rem;
}

.topbar .back:hover { color: var(--white); }

/* ---------- sheet ---------- */

main {
  max-width: var(--sheet);
  margin: 32px auto;
  padding: 0 24px;
}

.sheet {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 48px 56px 56px;
}

h1 {
  font-size: 2rem;
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 0 0 8px;
}

.subtitle {
  color: var(--muted);
  font-size: 1.05rem;
  margin: 0 0 20px;
}

.stamp {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 24px;
  font-size: 0.85rem;
  color: var(--muted);
  padding: 14px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.stamp b {
  color: var(--ink);
  font-weight: 600;
}

.short {
  background: var(--tint);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 28px 0 0;
}

.short strong {
  display: block;
  margin-bottom: 8px;
  color: var(--navy);
}

.short ul {
  margin: 0;
  padding-left: 20px;
}

.short li { margin: 5px 0; }

/* ---------- contents ---------- */

.toc {
  margin: 32px 0 0;
  padding: 22px 24px;
  border: 1px solid var(--line);
  border-radius: 12px;
}

.toc p {
  margin: 0 0 12px;
  font-size: 0.75rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}

.toc ol {
  margin: 0;
  padding-left: 20px;
  columns: 2;
  column-gap: 32px;
  font-size: 0.95rem;
}

.toc li {
  margin: 4px 0;
  break-inside: avoid;
}

.toc a {
  color: var(--navy-soft);
  text-decoration: none;
}

.toc a:hover { text-decoration: underline; }

.intro { margin: 28px 0 0; }

/* ---------- sections ---------- */

section {
  margin-top: 40px;
  scroll-margin-top: 24px;
}

h2 {
  font-size: 1.25rem;
  line-height: 1.35;
  margin: 0 0 14px;
  padding-bottom: 10px;
  border-bottom: 2px solid var(--tint);
  letter-spacing: -0.01em;
}

h2 .num {
  color: var(--sky);
  font-weight: 700;
  margin-right: 8px;
}

h3 {
  font-size: 1rem;
  margin: 28px 0 12px;
}

p { margin: 0 0 14px; }

ul, ol { padding-left: 22px; }

li { margin: 6px 0; }

a { color: var(--navy-soft); }

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.85em;
  background: var(--page);
  border-radius: 4px;
  padding: 1px 5px;
}

/* ---------- records (replace cramped tables) ---------- */

.records {
  border: 1px solid var(--line);
  border-radius: 12px;
  overflow: hidden;
}

.record {
  padding: 18px 22px;
}

.record + .record { border-top: 1px solid var(--line); }

.record > h4 {
  margin: 0 0 12px;
  font-size: 1rem;
  line-height: 1.45;
  font-weight: 600;
}

.record dl {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px 24px;
}

.record.pair dl { grid-template-columns: repeat(2, 1fr); }

.record dt {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
  margin-bottom: 3px;
}

.record dd {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.5;
}

.record dl > div { min-width: 0; }

/* ---------- never / note / todo ---------- */

.never {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(2, 1fr);
}

.never div {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px 16px;
  font-size: 0.92rem;
  line-height: 1.5;
}

.never b {
  display: block;
  margin-bottom: 3px;
}

.note {
  border-left: 3px solid var(--amber);
  background: var(--amber-soft);
  border-radius: 0 10px 10px 0;
  padding: 14px 18px;
  font-size: 0.93rem;
  margin: 16px 0 0;
}

.todo {
  background: var(--amber-soft);
  border: 1px dashed var(--amber);
  border-radius: 6px;
  padding: 1px 7px;
  font-size: 0.92em;
}

.after-records { margin-top: 16px; }

/* ---------- deletion ---------- */

.delete-box {
  background: var(--navy);
  color: var(--white);
  border-radius: 14px;
  padding: 26px 28px;
}

.delete-box h3 {
  margin: 0 0 10px;
  color: var(--white);
  font-size: 1.05rem;
}

.delete-box p {
  color: #cddff2;
  font-size: 0.95rem;
}

.delete-box p:last-child { margin-bottom: 0; }

.delete-box a { color: #8ecdff; }

.delete-box .path {
  display: inline-block;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  padding: 6px 12px;
  font-weight: 600;
  color: var(--white);
  margin-bottom: 14px;
}

/* ---------- footer ---------- */

footer {
  max-width: var(--sheet);
  margin: 0 auto;
  padding: 8px 48px 56px;
  color: var(--muted);
  font-size: 0.85rem;
}

footer p { margin: 0 0 8px; }

footer a { color: var(--navy-soft); }

/* ---------- narrow screens ---------- */

@media (max-width: 800px) {
  .sheet { padding: 32px 24px 40px; }
  h1 { font-size: 1.65rem; }
  .toc ol { columns: 1; }
  .record dl,
  .record.pair dl { grid-template-columns: 1fr; gap: 12px; }
  .never { grid-template-columns: 1fr; }
  footer { padding: 8px 24px 48px; }
}

@media (max-width: 480px) {
  main { margin: 16px auto; padding: 0 12px; }
  .sheet { padding: 26px 18px 32px; border-radius: 12px; }
  .delete-box { padding: 20px 18px; }
  .record { padding: 16px 16px; }
}