:root {
  --navy: #112e51;
  --navy-2: #1a4480;
  --red: #b50909;
  --text: #1b1b1b;
  --muted: #565c65;
  --bg: #ffffff;
  --bg-2: #f0f0f0;
  --panel: #ffffff;
  --line: #dfe1e2;
  --line-2: #a9aeb1;
  --link: #005ea2;
  --ok: #00a91c;
  --ok-soft: #ecf3ec;
  --warn: #c2850c;
  --warn-soft: #faf3d1;
  --info: #00bde3;
  --info-soft: #e7f6f8;
  --head-band: #112e51;
  --head-text: #ffffff;
  --serif: "Merriweather", Georgia, "Times New Roman", serif;
  --sans: "Public Sans", "Source Sans Pro", "Helvetica Neue", Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root {
    --text: #e6e6e6;
    --muted: #a9aeb1;
    --bg: #12161c;
    --bg-2: #1b2129;
    --panel: #181e26;
    --line: #2d3540;
    --line-2: #4a5360;
    --link: #73b3e7;
    --ok-soft: #14261a;
    --warn-soft: #2b2512;
    --info-soft: #10262b;
    --head-band: #0b1d33;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--bg); color: var(--text); font: 16px/1.6 var(--sans); }
a { color: var(--link); }
h1, h2, h3 { font-family: var(--serif); line-height: 1.3; font-weight: 700; color: var(--text); }
h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); margin: 0 0 .5em; }
h2 { font-size: 1.45rem; margin: 2em 0 .6em; padding-bottom: .3em; border-bottom: 1px solid var(--line); }
h2.first { margin-top: .6em; }
h3 { font-size: 1.1rem; margin: 1.4em 0 .4em; }
p { margin: 0 0 1em; }

/* header band */
.topbar { position: sticky; top: 0; z-index: 10; background: var(--head-band); color: var(--head-text); display: flex; align-items: center; gap: 20px; padding: 0 max(16px, calc((100% - 1120px)/2)); min-height: 64px; border-bottom: 4px solid var(--red); }
.brand { display: flex; align-items: center; gap: 12px; text-decoration: none; color: #fff; padding: 10px 0; }
.seal { width: 38px; height: 38px; flex: none; }
.seal svg { width: 100%; height: 100%; display: block; }
.seal-bg { fill: #ffffff; }
.seal-ring { fill: none; stroke: #112e51; stroke-width: 2; }
.seal-star { fill: #112e51; }
.brand-text { display: flex; flex-direction: column; line-height: 1.2; }
.brand-text b { font-family: var(--serif); font-size: 1rem; font-weight: 700; }
.brand-text small { font-size: .78rem; opacity: .85; }
.nav { display: flex; margin-left: auto; align-self: stretch; }
.nav a { display: flex; align-items: center; white-space: nowrap; padding: 0 14px; color: #fff; text-decoration: none; font-size: .92rem; font-weight: 600; border-bottom: 4px solid transparent; margin-bottom: -4px; }
.nav a:hover { background: rgba(255,255,255,.08); }
.nav a.on { border-bottom-color: #fff; }
.who { background: transparent; color: #fff; border: 1px solid rgba(255,255,255,.6); border-radius: 2px; padding: 6px 12px; font: 600 .85rem var(--sans); cursor: pointer; white-space: nowrap; }
.who:hover { background: rgba(255,255,255,.1); }

main { max-width: 1120px; margin: 0 auto; padding: 0 16px 56px; }
.foot { background: var(--bg-2); border-top: 1px solid var(--line); color: var(--muted); font-size: .85rem; }
.foot p { max-width: 1120px; margin: 0 auto; padding: 24px 16px 32px; }

.page-head { padding: 36px 0 8px; }
.eyebrow { font-size: .8rem; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--muted); margin-bottom: 8px; }
.page-head p { max-width: 50em; }
.lede { font-size: 1.1rem; }

/* buttons */
.btn { display: inline-flex; align-items: center; justify-content: center; border: 2px solid transparent; border-radius: 4px; padding: 9px 18px; font: 700 .95rem var(--sans); text-decoration: none; cursor: pointer; }
.btn-primary { background: #005ea2; color: #fff; }
.btn-primary:hover { background: #1a4480; }
.btn-ghost { background: transparent; color: var(--link); border-color: var(--link); }
.btn-ghost:hover { background: var(--info-soft); }
.btn-sm { padding: 6px 12px; font-size: .85rem; }
.cta-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 18px; }

/* layout */
.grid { display: grid; gap: 24px; }
.g2 { grid-template-columns: repeat(2, 1fr); }
.g3 { grid-template-columns: repeat(3, 1fr); }
.card { background: var(--panel); border: 1px solid var(--line); border-radius: 4px; padding: 20px 22px; }
.card h3 { margin-top: 0; }
.card p:last-child, .card ul:last-child { margin-bottom: 0; }

.toc { margin: 0; }
.toc dt { font-weight: 700; margin-top: 14px; }
.toc dt:first-child { margin-top: 0; }
.toc dd { margin: 2px 0 0; color: var(--muted); }

.pill { display: inline-block; font-size: .75rem; font-weight: 700; padding: 2px 8px; border-radius: 2px; border: 1px solid currentColor; }
.pill.ok { color: #19692a; background: var(--ok-soft); }
.pill.warn { color: #8a5d00; background: var(--warn-soft); }
.pill.info { color: var(--navy-2); background: var(--info-soft); }
.pill.gold { color: var(--muted); background: var(--bg-2); }
@media (prefers-color-scheme: dark) { .pill.ok { color: #70e17b; } .pill.warn { color: #ffbe2e; } .pill.info { color: #73b3e7; } }

/* source tiers: alert style */
.tier { border-left: 8px solid var(--line-2); background: var(--bg-2); padding: 16px 20px; margin: 18px 0; }
.tier.ok { border-color: var(--ok); background: var(--ok-soft); }
.tier.info { border-color: var(--info); background: var(--info-soft); }
.tier.warn { border-color: #ffbe2e; background: var(--warn-soft); }
.tier h3 { margin-top: 0; font-family: var(--sans); font-size: 1.05rem; }
.tier p:last-child { margin-bottom: 0; }
ul.clean, ol.clean { padding-left: 1.3em; margin: 0 0 1em; }
ul.clean li, ol.clean li { margin: .35em 0; }
.src { font-size: .84rem; color: var(--muted); }
.src a { color: var(--link); }
.note { border-left: 4px solid var(--navy-2); background: var(--bg-2); padding: 12px 16px; }
.callout { background: var(--info-soft); border: 1px solid var(--line-2); border-radius: 4px; padding: 14px 16px; }

/* tables */
table.t { width: 100%; border-collapse: collapse; font-size: .95rem; background: var(--panel); }
table.t th, table.t td { text-align: left; padding: 9px 12px; border: 1px solid var(--line-2); vertical-align: top; }
table.t thead th { background: var(--bg-2); font-weight: 700; }
table.t tbody th { background: var(--bg-2); font-weight: 700; width: 28%; }
table.t tr.here td { background: var(--warn-soft); }
.tablewrap { overflow-x: auto; }

/* section tabs */
.tabs { display: flex; flex-wrap: wrap; gap: 0; margin: 20px 0 8px; border-bottom: 2px solid var(--navy-2); }
.tabs button { background: var(--bg-2); color: var(--text); border: 1px solid var(--line); border-bottom: 0; padding: 8px 14px; font: 600 .9rem var(--sans); cursor: pointer; margin-right: 2px; }
.tabs button.on { background: var(--navy-2); color: #fff; border-color: var(--navy-2); }

/* memo */
.memo-sample { background: #fff; color: #1b1b1b; border: 1px solid var(--line-2); padding: 32px 40px; font: 15px/1.55 "Times New Roman", Times, serif; }
.memo-sample h4 { font: 700 15px "Times New Roman", Times, serif; margin: 1.2em 0 .3em; }
.memo-sample .mh { font-size: 15px; border-bottom: 1px solid #1b1b1b; padding-bottom: 12px; margin-bottom: 14px; }
.anno { display: block; font: 13px/1.45 var(--sans); background: #eff6fb; color: #1a4480; border-left: 4px solid #1a4480; padding: 6px 10px; margin: 6px 0 12px; }

/* practice list */
.exam-card { display: flex; flex-direction: column; gap: 8px; }
.exam-card .meta { display: flex; gap: 8px; align-items: center; flex-wrap: wrap; }
.exam-card .code { font-weight: 700; font-size: .85rem; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin-right: 4px; }
.exam-card h3 { margin: 0; }
.exam-card p { margin: 0; }
.exam-card .actions { margin-top: auto; padding-top: 10px; display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.exam-card .best { font-size: .85rem; color: var(--muted); }

.settings { display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 12px 24px; }
.settings label { display: flex; gap: 10px; align-items: flex-start; font-size: .94rem; }
.settings select { font: inherit; padding: 5px 8px; border: 1px solid var(--line-2); border-radius: 0; background: var(--panel); color: var(--text); }
.settings input[type=checkbox] { margin-top: 4px; }

/* results */
.review-memo { white-space: pre-wrap; background: #fff; color: #1b1b1b; border: 1px solid var(--line-2); padding: 22px 26px; font: 15px/1.55 "Times New Roman", Times, serif; max-height: 560px; overflow: auto; }
.checklist label { display: flex; gap: 10px; align-items: flex-start; padding: 10px 0; border-bottom: 1px solid var(--line); font-size: .95rem; cursor: pointer; }
.checklist label:last-child { border-bottom: 0; }
.checklist input { margin-top: 5px; flex: none; }
.score-row { display: grid; grid-template-columns: 1fr auto; gap: 10px; align-items: center; padding: 8px 0; border-bottom: 1px solid var(--line); }
.score-row:last-child { border-bottom: 0; }
.score-row small { display: block; color: var(--muted); font-size: .82rem; }
.dots { display: flex; gap: 3px; }
.dots button { width: 30px; height: 30px; border: 1px solid var(--line-2); border-radius: 2px; background: var(--panel); color: var(--text); font: 600 .85rem var(--sans); cursor: pointer; }
.dots button.on { background: var(--navy-2); color: #fff; border-color: var(--navy-2); }
.stats { display: flex; gap: 12px; flex-wrap: wrap; }
.stat { border: 1px solid var(--line-2); padding: 10px 14px; min-width: 130px; background: var(--panel); }
.stat b { display: block; font-size: 1.4rem; }
.stat span { font-size: .82rem; color: var(--muted); }
textarea.notes { width: 100%; min-height: 90px; font: inherit; padding: 10px; border: 1px solid var(--line-2); background: var(--panel); color: var(--text); }

.modal-back { position: fixed; inset: 0; background: rgba(0,0,0,.5); display: grid; place-items: center; z-index: 50; padding: 16px; }
.modal { background: var(--panel); color: var(--text); border-top: 6px solid var(--navy-2); padding: 24px; width: min(440px, 100%); box-shadow: 0 10px 40px rgba(0,0,0,.3); }
.modal h3 { margin-top: 0; }
.modal input { width: 100%; font: inherit; padding: 9px 10px; border: 1px solid var(--line-2); background: var(--bg); color: var(--text); margin: 6px 0 14px; }
.chips { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 14px; }

@media (max-width: 960px) {
  .topbar { flex-wrap: wrap; gap: 0 12px; }
  .nav { order: 3; width: 100%; margin-left: 0; overflow-x: auto; border-top: 1px solid rgba(255,255,255,.2); }
  .nav a { padding: 10px 12px; }
  .who { margin-left: auto; }
}
@media (max-width: 760px) {
  .g2, .g3 { grid-template-columns: 1fr; }
  table.t tbody th { width: 38%; }
  .memo-sample { padding: 20px; }
}