:root {
  color-scheme: light;
  --navy: #0b1d34;
  --navy-link: #18395d;
  --gold: #c79b41;
  --gold-light: #f2cf81;
  --page: #f2f6fc;
  --paper: #ffffff;
  --text: #25384c;
  --muted: #4d5f73;
  --line: #d8e1eb;
  --control-line: #aebdca;
  --selected: #eaf2fc;
  --correct: #216044;
  --correct-bg: #ecf8f0;
  --incorrect: #923238;
  --incorrect-bg: #fdf0ef;
  --radius: 17px;
  font: 16px/1.6 Arial, system-ui, sans-serif;
}

*, *::before, *::after { box-sizing: border-box; }
body { margin: 0; color: var(--text); background: var(--page); }
[hidden] { display: none !important; }
a { color: var(--navy-link); text-underline-offset: .2em; }
h1, h2, h3, h4 { color: var(--navy); line-height: 1.19; margin: 0 0 .55em; }
h2 { font-size: clamp(1.45rem, 2.5vw, 1.8rem); }
h3 { font-size: 1.2rem; }
h4 { font-size: 1.03rem; }
p { margin: 0 0 .8em; }
p:last-child { margin-bottom: 0; }
ul, ol { margin: .35rem 0 .7rem; padding-left: 1.35rem; }
li + li { margin-top: .4rem; }
button, input { font: inherit; }
button { cursor: pointer; }
button:disabled { cursor: default; }
:focus-visible { outline: 3px solid #336b9b; outline-offset: 3px; }
[tabindex="-1"]:focus { outline: none; }
section, details[id] { scroll-margin-top: 1.25rem; }

.wrap { width: min(1110px, calc(100% - 40px)); margin-inline: auto; }
.skip {
  position: absolute;
  z-index: 1;
  left: 1rem;
  top: .75rem;
  background: var(--paper);
  border: 1px solid var(--control-line);
  border-radius: 8px;
  padding: .5rem .75rem;
  transform: translateY(-150%);
}
.skip:focus { transform: translateY(0); }
.topbar { background: var(--paper); border-bottom: 3px solid var(--gold); }
.topbar .wrap {
  display: flex;
  min-height: 56px;
  align-items: center;
  justify-content: space-between;
  gap: .35rem 1.25rem;
  padding-block: .55rem;
}
.brand, .topbar nav a {
  color: var(--navy-link);
  font-weight: 700;
  text-decoration: none;
}
.topbar nav { display: flex; flex-wrap: wrap; gap: .2rem 1.15rem; }
.topbar a:hover { text-decoration: underline; }
.hero { background: var(--navy); color: #dce6f2; padding: clamp(2.25rem, 4.8vw, 3.35rem) 0; }
.hero h1 {
  color: var(--paper);
  font-size: clamp(2rem, 4.6vw, 3.5rem);
  letter-spacing: -.026em;
  margin-bottom: .28em;
}
.hero .section-label {
  color: var(--gold-light);
  font-size: .78rem;
  font-weight: 700;
  letter-spacing: .095em;
  text-transform: uppercase;
  margin-bottom: .7rem;
}
.hero .intro { font-size: clamp(1rem, 2vw, 1.13rem); }
main.wrap { padding-block: clamp(1.4rem, 4vw, 3rem) 2rem; }
.panel {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(1rem, 2.5vw, 1.65rem);
  margin-bottom: 1.1rem;
}
.muted { color: var(--muted); }
.overview-table { width: 100%; border-collapse: collapse; margin: .8rem 0 .65rem; }
.overview-table th, .overview-table td {
  padding: .55rem .65rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
  vertical-align: top;
  overflow-wrap: anywhere;
}
.overview-table th { color: var(--navy); }
.overview-table thead { background: #f5f8fc; }
.overview-table th:first-child { width: 31%; }
.overview-table th:nth-child(2) { width: 19%; }
.overview-note { font-size: .9rem; margin-bottom: 1rem; }
.guide-row {
  background: #f7f9fc;
  border: 1px solid var(--line);
  border-radius: 10px;
  margin-top: .65rem;
}
summary { cursor: pointer; color: var(--navy); font-weight: 700; }
.guide-row summary { padding: .65rem .85rem; }
.guide-row > div { padding: 0 .85rem .7rem; }
.guide-row > div :last-child { margin-bottom: 0; }

.timer-row, .practice-actions, .question-actions, .practice-meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .55rem;
}
.timer-row label { font-weight: 700; color: var(--navy); }
.timer-row input {
  width: 4.2rem;
  min-height: 42px;
  background: var(--paper);
  color: var(--navy);
  border: 1px solid var(--control-line);
  border-radius: 7px;
  padding: .35rem .45rem;
}
.timer-row output {
  min-width: 3.5ch;
  margin-inline: .2rem .35rem;
  font-weight: 700;
  font-size: 1.5rem;
  font-variant-numeric: tabular-nums;
  color: var(--navy);
}
.timer-status { margin-top: .5rem; }
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--paper);
  color: var(--navy);
  border: 1px solid var(--control-line);
  border-radius: 8px;
  min-height: 43px;
  padding: .45rem .85rem;
  line-height: 1.35;
  font-weight: 700;
}
.button:hover:not(:disabled) { background: #edf3fb; border-color: #7191b1; }
.button.primary { background: var(--navy); border-color: var(--navy); color: var(--paper); }
.button.primary:hover:not(:disabled) { background: var(--navy-link); border-color: var(--navy-link); }
.button:disabled { background: #f5f7fa; border-color: var(--line); color: #657487; }

.practice-meta { justify-content: space-between; margin-bottom: .65rem; }
.progress { color: var(--muted); font-weight: 700; }
.question-nav {
  display: grid;
  grid-template-columns: repeat(15, minmax(40px, 1fr));
  gap: .35rem;
  margin-bottom: 1.2rem;
}
.question-nav button { padding: .45rem .2rem; }
.question-nav [data-state="answered"] { background: var(--selected); color: var(--navy-link); }
.question-nav [data-state="incomplete"] { background: #fbf1d6; color: var(--navy); }
.question-nav [data-state="correct"] { background: var(--correct-bg); color: var(--correct); }
.question-nav [data-state="incorrect"] { background: var(--incorrect-bg); color: var(--incorrect); }
.question-nav [aria-current="step"] {
  background: var(--navy);
  border-color: var(--navy);
  color: var(--paper);
  box-shadow: 0 0 0 2px var(--gold);
}
.question-nav [aria-current="step"]:hover { background: var(--navy-link); color: var(--paper); }
.question-card { border: 1px solid var(--line); border-radius: 13px; overflow: clip; }
.question-heading { padding: 1rem 1.15rem; border-bottom: 1px solid var(--line); }
.question-heading h3 { font-size: 1rem; color: var(--muted); margin-bottom: .3rem; }
.question-heading p { font-size: 1.15rem; font-weight: 700; color: var(--navy); }
.question-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  align-items: start;
  gap: 1.05rem;
  padding: 1rem 1.15rem;
}
.passage {
  background: #f5f8fc;
  border-left: 3px solid var(--gold);
  border-radius: 0 8px 8px 0;
  padding: .9rem 1rem;
  line-height: 1.68;
}
.passage mark {
  color: inherit;
  background: #f7e6a8;
  border-radius: 2px;
  font-weight: 600;
}
.completion-body { display: block; }
.completion-options {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .85rem;
  margin-top: 1rem;
}
.completion-options[data-blanks="1"] { grid-template-columns: minmax(0, 1fr); }
.completion-options[data-blanks="2"] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
fieldset { margin: 0; padding: 0; border: 0; min-inline-size: 0; }
legend { padding: 0; font-weight: 700; color: var(--navy); margin-bottom: .45rem; }
.options { display: grid; gap: .4rem; }
.option {
  display: grid;
  grid-template-columns: auto 1.15rem minmax(0, 1fr);
  gap: .55rem;
  align-items: start;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: .55rem .65rem;
  cursor: pointer;
}
.option:hover { border-color: #799ab9; }
.option input { margin: .24rem 0 0; width: 1.05rem; height: 1.05rem; accent-color: var(--navy-link); }
.option:has(input:checked) { background: var(--selected); border-color: #7295b8; }
.option:has(input:focus-visible) { outline: 2px solid #336b9b; outline-offset: 2px; }
.option:has(input:focus-visible) input { outline: none; }
.option:has(input:disabled) { cursor: default; }
.option.is-correct { background: var(--correct-bg); border-color: #82b69a; color: var(--correct); }
.option.is-incorrect { background: var(--incorrect-bg); border-color: #d8a09f; color: var(--incorrect); }
.option-letter { font-weight: 700; }
.inline-result { padding: 0 1.15rem; }
.question-actions { padding: .8rem 1.15rem; justify-content: space-between; border-top: 1px solid var(--line); }
.practice-actions { margin-top: 1rem; }
.score {
  margin-top: .8rem;
  padding: .55rem .8rem;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f7f9fc;
  font-weight: 700;
  color: var(--navy);
}

.answer-item { border: 1px solid var(--line); border-radius: 9px; margin-bottom: .55rem; }
.answer-item summary { padding: .65rem .8rem; }
.answer-item summary::marker { color: var(--navy-link); }
.answer-item[open] summary { border-bottom: 1px solid var(--line); }
.answer-item > div { padding: .8rem; }
.answer-subtype { color: var(--muted); }
.evidence {
  padding: .55rem .75rem;
  margin: .3rem 0 .7rem;
  border-left: 3px solid var(--gold);
  background: #f5f8fc;
}
.rationale-title { display: block; color: var(--navy); }
.answer-item ul { list-style: none; padding-left: 0; }
footer { background: var(--paper); border-top: 1px solid var(--line); padding: 1.2rem 0 1.35rem; font-size: .875rem; color: var(--muted); }

@media (max-width: 900px) {
  .question-nav { grid-template-columns: repeat(8, minmax(36px, 1fr)); }
}
@media (max-width: 740px) {
  .question-body { grid-template-columns: minmax(0, 1fr); }
  .completion-options, .completion-options[data-blanks="2"] { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 510px) {
  .wrap { width: calc(100% - 26px); }
  .topbar .wrap { align-items: flex-start; flex-direction: column; }
  .topbar nav { font-size: .9rem; }
  .overview-table th, .overview-table td { font-size: .9rem; padding-inline: .35rem; }
  .question-nav { grid-template-columns: repeat(5, minmax(36px, 1fr)); }
  .question-heading, .question-body, .question-actions { padding-inline: .75rem; }
  .inline-result { padding-inline: .75rem; }
  .question-actions .button { padding-inline: .5rem; font-size: .92rem; }
}
.collection + .collection {
  border-top: 1px solid var(--line);
  margin-top: 1.2rem;
  padding-top: 1.2rem;
}
.set-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(100%, 360px), 1fr));
  gap: .8rem;
  list-style: none;
  margin: .7rem 0 0;
  padding: 0;
}
.set-list > li { margin: 0; }
.set-card {
  background: #f7f9fc;
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: .95rem 1rem;
  height: 100%;
}
.set-meta { color: var(--muted); font-size: .9rem; margin-bottom: .25rem; }
.set-card h4 { font-size: 1.16rem; }
a.button { text-decoration: none; }