:root {
  --bg: #f7f6f2;
  --card: #ffffff;
  --ink: #17212b;
  --muted: #5b6672;
  --line: #e3e0d8;
  --brand: #1f4e79;
  --brand-ink: #ffffff;
  --accent: #2f7d4f;
  --accent-soft: #e8f3ec;
  --warn: #9a5b00;
  --warn-soft: #fff4e0;
  --stop: #8a2f2f;
  --stop-soft: #fbeaea;
  --radius: 14px;
  --serif: "Iowan Old Style", "Palatino Linotype", Palatino, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--ink); font: 17px/1.6 var(--sans); }
a { color: var(--brand); }
.wrap { max-width: 1060px; margin: 0 auto; padding: 0 16px; }

/* header */
.site-head { background: var(--card); border-bottom: 1px solid var(--line); }
.site-head .wrap { display: flex; align-items: center; justify-content: space-between; height: 60px; }
.logo { display: flex; align-items: center; gap: 10px; font: 700 19px/1 var(--serif); color: var(--ink); text-decoration: none; }
.logo svg { flex: none; }
.nav { display: flex; gap: 18px; font-size: 15px; }
.nav a { color: var(--muted); text-decoration: none; }
.nav a:hover { color: var(--brand); }

/* hero */
.hero { padding: 34px 0 12px; }
.hero h1 { font: 700 clamp(28px, 4.4vw, 40px)/1.15 var(--serif); margin: 0 0 10px; letter-spacing: -0.01em; }
.hero p { margin: 0; color: var(--muted); max-width: 720px; }
.data-note { display: inline-flex; align-items: center; gap: 8px; margin-top: 14px; font-size: 14px; color: var(--accent); background: var(--accent-soft); padding: 6px 12px; border-radius: 99px; }

/* layout */
.grid { display: grid; grid-template-columns: minmax(0, 1fr) 300px; gap: 28px; padding: 18px 0 40px; }
.grid > * { min-width: 0; }
@media (max-width: 900px) { .grid { grid-template-columns: 1fr; } }

/* calculator */
.calc { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); box-shadow: 0 1px 2px rgba(23, 33, 43, .04), 0 8px 24px rgba(23, 33, 43, .05); overflow: hidden; }
.calc-head { background: var(--brand); color: var(--brand-ink); padding: 14px 20px; display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.calc-head h2 { margin: 0; font: 600 18px/1.3 var(--sans); }
.asof { display: flex; align-items: center; gap: 8px; font-size: 14px; }
.asof select { background: rgba(255, 255, 255, .14); color: #fff; border: 1px solid rgba(255, 255, 255, .35); border-radius: 8px; padding: 5px 8px; font: inherit; }
.asof select option { color: var(--ink); }
.form { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; padding: 20px; }
@media (max-width: 640px) { .form { grid-template-columns: 1fr 1fr; } }
.field label { display: block; font-size: 13px; font-weight: 600; color: var(--muted); margin-bottom: 6px; text-transform: uppercase; letter-spacing: .04em; }
.field select { width: 100%; font: 16px var(--sans); padding: 11px 12px; border: 1px solid #cfcabd; border-radius: 10px; background: #fff; color: var(--ink); appearance: none;
  background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%);
  background-position: calc(100% - 18px) 50%, calc(100% - 13px) 50%; background-size: 5px 5px; background-repeat: no-repeat; }
.field select:focus { outline: 3px solid rgba(31, 78, 121, .25); border-color: var(--brand); }
.actions { display: flex; gap: 10px; padding: 0 20px 20px; flex-wrap: wrap; }
.btn { font: 600 16px var(--sans); border-radius: 10px; padding: 12px 18px; cursor: pointer; border: 1px solid var(--brand); }
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: #173d60; }
.btn-ghost { background: #fff; color: var(--brand); }
.btn-ghost:hover { background: #f0f4f8; }
.error { margin: 0 20px 20px; padding: 12px 14px; border-radius: 10px; background: var(--stop-soft); color: var(--stop); font-size: 15px; }

/* result */
.result > * { min-width: 0; }
.result { border-top: 1px solid var(--line); padding: 22px 20px; display: grid; grid-template-columns: 1.1fr 1fr; gap: 20px; align-items: start; }
@media (max-width: 640px) { .result { grid-template-columns: 1fr; } }
.result .label { font-size: 13px; color: var(--muted); text-transform: uppercase; letter-spacing: .05em; font-weight: 600; }
.big { font: 700 44px/1.1 var(--serif); margin: 6px 0 4px; letter-spacing: -0.01em; }
.sub { color: var(--muted); font-size: 15px; }
.badge { display: inline-block; margin-top: 12px; padding: 8px 12px; border-radius: 10px; font-size: 14.5px; line-height: 1.45; }
.badge.OK { background: var(--accent-soft); color: var(--accent); }
.badge.MA { background: var(--stop-soft); color: var(--stop); }
.badge.P5, .badge.NE { background: var(--warn-soft); color: var(--warn); }
dl.facts { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 8px 16px; font-size: 15.5px; }
dl.facts dt { color: var(--muted); }
dl.facts dd { margin: 0; text-align: right; font-weight: 600; font-variant-numeric: tabular-nums; }

/* bond list */
.list { border-top: 1px solid var(--line); padding: 18px 20px 20px; }
.list h3 { margin: 0 0 10px; font-size: 16px; }
.table-scroll { overflow-x: auto; }
table.bonds { width: 100%; border-collapse: collapse; font-size: 15px; font-variant-numeric: tabular-nums; }
table.bonds th { text-align: left; font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); border-bottom: 1px solid var(--line); padding: 6px 8px; white-space: nowrap; }
table.bonds td { border-bottom: 1px solid #efece6; padding: 8px; white-space: nowrap; }
table.bonds td.num, table.bonds th.num { text-align: right; }
table.bonds tfoot td { font-weight: 700; border-bottom: 0; }
.rm { background: none; border: 0; color: var(--muted); cursor: pointer; font-size: 18px; line-height: 1; }
.rm:hover { color: var(--stop); }
.list-tools { display: flex; justify-content: space-between; align-items: center; margin-top: 10px; gap: 10px; flex-wrap: wrap; font-size: 14px; color: var(--muted); }
.linkbtn { background: none; border: 0; color: var(--brand); cursor: pointer; font: inherit; padding: 0; text-decoration: underline; }

/* side + content */
aside .box { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 18px; margin-bottom: 18px; font-size: 15.5px; }
aside .box h3 { margin: 0 0 8px; font: 700 17px/1.3 var(--serif); }
aside .box ul { margin: 0; padding-left: 18px; }
.ad-slot { min-height: 0; }
.content { padding: 0 0 48px; }
.content h2 { font: 700 26px/1.25 var(--serif); margin: 36px 0 10px; }
.content h3 { font-size: 18px; margin: 22px 0 6px; }
.content p, .content li { max-width: 760px; }
.bond-figure { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 14px; max-width: 760px; }
.bond-figure svg { width: 100%; height: auto; display: block; }
.bond-figure figcaption { font-size: 14px; color: var(--muted); margin-top: 8px; }
details.faq { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 18px; margin: 10px 0; max-width: 760px; }
details.faq summary { cursor: pointer; font-weight: 600; }
details.faq p { margin: 10px 0 0; }

/* footer */
.site-foot { border-top: 1px solid var(--line); background: var(--card); font-size: 14px; color: var(--muted); }
.site-foot .wrap { padding: 22px 16px; display: grid; gap: 8px; }
.site-foot a { color: var(--muted); }

/* --- v2: site-wide components --- */
.next { margin: 10px 0 0; font-size: 15px; }
td.st.MA { color: var(--stop); font-weight: 600; }
td.st.OK { color: var(--accent); }
td.st.P5, td.st.NE { color: var(--warn); }
.stack-notes { margin: 12px 0 0; padding: 12px 14px 12px 30px; background: var(--warn-soft); border-radius: 10px; font-size: 15px; }
.stack-notes li + li { margin-top: 6px; }
.tax-row { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; margin-top: 12px; font-size: 15px; }
.tax-row select { font: inherit; padding: 6px 8px; border: 1px solid #cfcabd; border-radius: 8px; background: #fff; }
.tax-row b { font-variant-numeric: tabular-nums; }
.crumbs { font-size: 14px; color: var(--muted); padding-top: 18px; }
.crumbs a { color: var(--muted); }
.steps { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 14px; margin: 14px 0 6px; }
@media (max-width: 900px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }
.step { display: block; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 16px; text-decoration: none; color: var(--ink); transition: border-color .15s, transform .15s; }
.step:hover { border-color: var(--brand); transform: translateY(-1px); }
.step .n { display: inline-grid; place-items: center; width: 28px; height: 28px; border-radius: 50%; background: var(--brand); color: #fff; font-weight: 700; font-size: 14px; }
.step h3 { margin: 10px 0 4px; font: 700 17px/1.3 var(--serif); }
.step p { margin: 0; font-size: 14.5px; color: var(--muted); }
.cards { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; margin: 12px 0; }
.card-link { display: block; background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 14px 16px; text-decoration: none; color: var(--ink); }
.card-link:hover { border-color: var(--brand); }
.card-link b { display: block; font-family: var(--serif); font-size: 17px; }
.card-link span { font-size: 14px; color: var(--muted); }
table.data { width: 100%; border-collapse: collapse; background: var(--card); font-size: 15px; font-variant-numeric: tabular-nums; border: 1px solid var(--line); border-radius: 12px; overflow: hidden; }
table.data th, table.data td { padding: 8px 10px; border-bottom: 1px solid #efece6; text-align: left; white-space: nowrap; }
table.data th { font-size: 12.5px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); background: #faf9f5; }
table.data .num { text-align: right; }
table.data tr:last-child td { border-bottom: 0; }
.pill { display: inline-block; font-size: 12.5px; font-weight: 600; padding: 2px 8px; border-radius: 99px; }
.pill.MA { background: var(--stop-soft); color: var(--stop); }
.pill.OK { background: var(--accent-soft); color: var(--accent); }
.pill.P5, .pill.NE { background: var(--warn-soft); color: var(--warn); }
.callout { background: var(--card); border-left: 4px solid var(--brand); border-radius: 8px; padding: 14px 16px; margin: 16px 0; max-width: 760px; }
.callout.stop { border-color: var(--stop); }
.callout.ok { border-color: var(--accent); }
.callout.warn { border-color: var(--warn); }
.chart { background: var(--card); border: 1px solid var(--line); border-radius: 12px; padding: 12px; max-width: 760px; }
.chart svg { width: 100%; height: auto; display: block; }
.chart figcaption { font-size: 13.5px; color: var(--muted); margin-top: 6px; }
.yearnav { display: flex; justify-content: space-between; gap: 12px; margin: 26px 0; max-width: 760px; }
.years { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.years a { display: inline-block; padding: 6px 10px; border: 1px solid var(--line); border-radius: 8px; background: var(--card); text-decoration: none; font-variant-numeric: tabular-nums; }
.years a.MA { color: var(--stop); }
.years a:hover { border-color: var(--brand); }
.legend { font-size: 14px; color: var(--muted); }
.content ol li + li, .content ul li + li { margin-top: 6px; }
.updated { font-size: 14px; color: var(--muted); }
.mini-calc .calc-head { padding: 12px 18px; }
.foot-links { display: flex; flex-wrap: wrap; gap: 14px; }
.content .calc-head h2 { font: 600 18px/1.3 var(--sans); margin: 0; }
.content .calc { margin: 12px 0 8px; max-width: 900px; }
.nav a { white-space: nowrap; }
@media (max-width: 760px) {
  .site-head .wrap { flex-wrap: wrap; height: auto; padding-top: 10px; padding-bottom: 8px; gap: 6px; }
  .nav { width: 100%; overflow-x: auto; gap: 16px; font-size: 14px; padding-bottom: 2px; -webkit-overflow-scrolling: touch; }
}