/* Native-feeling controls around the supplied scientific design. */
:root {
  --ui-font: -apple-system, BlinkMacSystemFont, "SF Pro Text", sans-serif;
  --header-height: 56px;
  --native-shadow: 0 1px 2px #00000008, 0 8px 28px #0000000a;
}
.topbar { border-bottom-color: color-mix(in srgb, var(--hairline) 80%, transparent); }
.topbar .nav-btn {
  font: 600 13px/1.4 var(--ui-font);
  text-transform: none;
  letter-spacing: 0;
  color: var(--ink-2);
}
.topbar .nav-btn.active { color: var(--cyan); }
.topbar .appearance > summary { font: 500 12px var(--ui-font); }
.export-save-pill { font: 500 11px var(--ui-font); letter-spacing: 0; text-transform: none; }
.export-save-icon { font-size: 0; }
.export-save-icon::before { width: 6px; height: 6px; margin-right: 2px; }
.topbar button:not(.nav-btn), .native-primary, .native-secondary {
  font: 600 13px/1.4 var(--ui-font);
  text-transform: none;
  letter-spacing: 0;
  border-radius: 10px;
}
.native-primary, .native-secondary {
  min-height: 44px;
  padding: 12px 20px;
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--hairline);
}
.native-primary { color: var(--ground); background: var(--cyan); border-color: var(--cyan); }
.native-secondary { color: var(--ink); background: var(--ground-2); }
.native-primary:hover { filter: brightness(1.06); box-shadow: 0 4px 20px color-mix(in srgb, var(--cyan) 16%, transparent); }
.native-secondary:hover { background: var(--surface-2); border-color: var(--ink-2); }
.native-primary .ui-icon, .native-secondary .ui-icon { width: 16px; height: 16px; }
.hero-actions { display: flex; justify-content: center; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
.export-hero .hero-resume-caption { margin-top: 12px !important; font: 12px/1.5 var(--ui-font) !important; color: var(--muted); }
.export-hero > div { height: 100% !important; }
.export-hero { height: calc(100svh - var(--header-height)) !important; min-height: 700px !important; }
.export-hero .masked-inner { font-size: inherit; }
.export-hero h1 { font-size: clamp(64px, 6.5vw, 92px); }

/* Modes stay visible before an attempt starts. */
.exam-card { border-radius: 18px; box-shadow: var(--native-shadow); }
.exam-card:hover { transform: translateY(-2px); }
.exam-card .exam-mode-label { display: block; font: 600 12px/1.5 var(--ui-font); color: var(--ink-2); margin-bottom: 10px; }
.exam-card .exam-mode-picker {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  padding: 4px;
  margin: 0;
  gap: 3px;
  background: color-mix(in srgb, var(--ink) 5%, var(--ground));
  border: 1px solid var(--hairline);
  border-radius: 11px;
}
.exam-mode-picker label {
  position: relative;
  display: flex;
  min-height: 34px;
  justify-content: center;
  align-items: center;
  padding: 6px;
  border: 1px solid transparent;
  border-radius: 7px;
  color: var(--ink-2);
  background: transparent;
  font: 500 12px var(--ui-font);
}
.exam-mode-picker input { position: absolute; inset: 0; opacity: 0; width: 100%; height: 100%; margin: 0; cursor: pointer; }
.exam-mode-picker span { pointer-events: none; }
.exam-mode-picker label:has(input:checked) {
  background: var(--ground-2);
  color: var(--ink);
  border-color: var(--hairline);
  box-shadow: 0 1px 4px #0002;
}
.exam-mode-picker label:has(input:focus-visible) { outline: 2px solid var(--cyan); outline-offset: 2px; }
.exam-mode-picker label:hover { color: var(--ink); }
.mode-summary { font: 12px/1.6 var(--ui-font); color: var(--ink-2); min-height: 39px; margin-top: 9px; }
.exam-card .start {
  width: auto !important;
  height: auto !important;
  min-height: 44px !important;
  border-radius: 10px !important;
  padding: 10px 13px !important;
  gap: 8px;
  background: var(--cyan);
  color: var(--ground);
  border-color: var(--cyan);
  font: 600 12px var(--ui-font);
  white-space: nowrap;
}
.exam-card .start svg { width: 15px; height: 15px; }
.export-exam-details > summary { font: 500 12px var(--ui-font); text-transform: none; letter-spacing: 0; }
.export-saved-row { padding: 20px; border: 1px solid var(--hairline); border-radius: 14px; background: var(--ground-2); }
.export-saved-row strong { font-size: 15px; }
.export-saved-row button { font-family: var(--ui-font); }

/* Question-first exam workspace, with calm surfaces and a clear next action. */
.canvas-question-card { box-shadow: var(--native-shadow); }
.canvas-question-header { background: color-mix(in srgb, var(--ink) 2%, var(--ground-2)); }
.question-head h2 { font: 650 15px var(--ui-font); }
.question-head .points { font: 500 12px var(--ui-font); }
.question-head h2:focus { outline: none; }
.sidebar .navigation-buttons button, .sidebar summary, .sidebar #open-coverage,
.sidebar #shuffle-remaining, .sidebar-actions button, .flag-toggle, #hint-toggle {
  font-family: var(--ui-font) !important;
  font-weight: 500;
}
.sidebar-check #sidebar-check-answer {
  font: 650 14px var(--ui-font) !important;
  letter-spacing: 0 !important;
  text-transform: none !important;
  box-shadow: 0 2px 6px #0002;
}
.confidence-choice {
  position: relative;
  min-height: 86px;
  border-radius: 13px;
}
.confidence-choice .label-caps { font-family: var(--ui-font) !important; font-weight: 500; }
.confidence-choice[aria-pressed=true]::after {
  content: "✓";
  position: absolute;
  right: 7px;
  top: 5px;
  color: var(--confidence);
  font: 600 11px var(--ui-font);
}
.confidence-choice[aria-pressed=true] { box-shadow: 0 2px 10px color-mix(in srgb, var(--confidence) 10%, transparent); }
.field-row input, .answer-select-button { background: var(--ground-2); font-family: var(--ui-font); }
.answer-select-menu { background: color-mix(in srgb, var(--ground-2) 96%, transparent); backdrop-filter: blur(24px); -webkit-backdrop-filter: blur(24px); }
.answer-select-menu [role=option] { font-family: var(--ui-font); }
.q-num.checked-stale { border-color: var(--amber); box-shadow: inset 0 -2px var(--amber); }
.q-grid { gap: 7px; }
.persistent-check-status { border-radius: 12px; }
.question-result-badge { font-family: var(--ui-font); }
.chapter-progress[open] > summary > div:first-child > .ui-icon,
.chapter-progress[open] > summary .chapter-explore > .ui-icon { transform: rotate(90deg); }
.chapter-progress > summary { box-shadow: var(--native-shadow); }
.outcome-progress[open] > summary .outcome-title { color: var(--cyan); }

/* Search narrows the curriculum while keeping the existing chapter grouping. */
.outcome-controls { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }
.outcome-search {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 0 12px;
  min-height: 42px;
  width: 260px;
  border: 1px solid var(--hairline);
  border-radius: 10px;
  color: var(--ink-2);
  background: var(--ground-2);
}
.outcome-search:focus-within { border-color: var(--cyan); box-shadow: 0 0 0 3px var(--focus-ring); }
.outcome-search input { width: 100%; min-width: 0; border: 0; outline: 0; padding: 0; background: transparent; color: var(--ink); font: 13px var(--ui-font); height: 40px; box-shadow: none !important; }
.outcome-search .ui-icon { width: 16px; height: 16px; flex-shrink: 0; }
.outcome-result-count { font: 12px/1.5 var(--ui-font); color: var(--muted); }
.outcome-empty { text-align: center; padding: 50px 24px; background: var(--ground-2); border: 1px solid var(--hairline); border-radius: 18px; }
.outcome-empty > .ui-icon { width: 30px; height: 30px; margin: 0 auto 14px; color: var(--muted); }
.outcome-empty h3 { font-size: 20px; font-weight: 650; margin-bottom: 8px; }
.outcome-empty p { font-size: 14px; color: var(--ink-2); margin-bottom: 20px; }
.review-filter button { font: 500 12px var(--ui-font); letter-spacing: 0; text-transform: none; }
.review-question { border-radius: 18px; }
.review-notes { font-family: var(--ui-font); }
.history-table th { font: 600 12px var(--ui-font); text-transform: none; }

.focus-setting { display: flex !important; align-items: center; justify-content: space-between; gap: 12px; padding-top: 16px; margin-top: 4px; border-top: 1px solid var(--hairline); }
.focus-setting strong { display: block; font: 600 13px var(--ui-font); }
.focus-setting small { display: block; font: 11px/1.5 var(--ui-font); color: var(--muted); margin-top: 4px; }
.focus-setting input { appearance: none; -webkit-appearance: none; width: 36px; height: 22px; flex-shrink: 0; border: 0; border-radius: 20px; padding: 0; background: var(--surface-3); position: relative; cursor: pointer; }
.focus-setting input::after { content: ""; position: absolute; width: 18px; height: 18px; left: 2px; top: 2px; background: #fff; border-radius: 50%; box-shadow: 0 1px 3px #0003; transition: transform .18s var(--ease); }
.focus-setting input:checked { background: var(--cyan); }
.focus-setting input:checked::after { transform: translateX(14px); }
#focus-exit { display: none; }
:root[data-focus=true] body[data-screen=exam] .topbar nav,
:root[data-focus=true] body[data-screen=exam] .export-nav-divider,
:root[data-focus=true] body[data-screen=exam] .sidebar-session-details,
:root[data-focus=true] body[data-screen=exam] .shortcut-menu,
:root[data-focus=true] body[data-screen=exam] .sidebar-actions,
:root[data-focus=true] body[data-screen=exam] #shuffle-remaining { display: none !important; }
:root[data-focus=true] body[data-screen=exam] #focus-exit { display: inline-flex; }
#notice { top: var(--header-height); }

@media(max-width:1100px) {
  .topbar .nav-btn { font-size: 12px; }
  .export-nav-left { gap: 14px; }
  .outcome-controls { width: 100%; }
  .outcome-search { flex: 1; min-width: 220px; }
}
@media(max-width:800px) {
  :root { --header-height: 90px; }
  .topbar .nav-btn { font-size: 11px; }
  .topbar .brand { gap: 6px; }
  .topbar .brand .font-mono { font-size: 13px; }
  .topbar .export-nav-right { gap: 6px; }
  .topbar button:not(.nav-btn) { font-size: 11px; padding-inline: 11px; }
  .topbar .appearance > summary { font-size: 11px; padding-inline: 6px; }
  .export-hero { min-height: 700px !important; }
  .hero-actions { flex-direction: column; margin-top: 24px; align-items: center; }
  .hero-actions button { width: min(260px, 100%); }
  .export-hero .hero-resume-caption { max-width: 280px; margin-inline: auto; }
  .exam-card .start { min-height: 42px; }
  .outcome-search { flex-basis: 100%; width: 100%; }
  .outcome-controls select { flex: 1; }
  .outcome-controls #collapse-outcomes { font: 12px var(--ui-font); text-transform: none; letter-spacing: 0; }
  #mobile-exam-dock #sidebar-check-answer { font-family: var(--ui-font) !important; font-size: 12px !important; text-transform: none; letter-spacing: 0 !important; }
  #mobile-exam-dock .confidence-choice[aria-pressed=true]::after { right: 4px; top: 3px; font-size: 9px; }
  :root[data-focus=true]:has(body[data-screen=exam]) { --header-height: 56px; }
  :root[data-focus=true] body[data-screen=exam] .topbar { height: 56px; min-height: 56px; padding-block: 0; }
  :root[data-focus=true] body[data-screen=exam] #app { margin-top: 56px; }
  :root[data-focus=true] body[data-screen=exam] .appearance { display: none; }
}
@media(prefers-reduced-motion:reduce) {
  .focus-setting input::after { transition: none; }
}

/* Keep destination headings clear of the fixed navigation. */
#exam-library { scroll-margin-top: calc(var(--header-height) + 28px); }
.outcome-controls, #outcome-result-count { scroll-margin-top: calc(var(--header-height) + 28px); }
.topbar #top-submit { font: 600 12px var(--ui-font) !important; text-transform: none !important; letter-spacing: 0 !important; border-radius: 9px; }
.exam-card .exam-mode-picker label { font: 500 12px var(--ui-font); }

.chapter-progress > summary::after { display: none; }
@media(max-width:600px) {
  .chapter-progress > summary { position: relative; display: block !important; padding: 20px !important; }
  .chapter-progress > summary > div:first-child { position: absolute; top: 24px; left: 18px; gap: 10px !important; }
  .chapter-progress .chapter-overview-grid { width: 100%; grid-template-columns: minmax(0,1fr) minmax(0,1fr); gap: 20px 18px; }
  .chapter-progress .chapter-title-block { padding-left: 76px; min-height: 68px; }
  .chapter-progress .chapter-title { font-size: 19px; }
  .chapter-progress .metric-caption { font-size: 12px; }
  .chapter-progress .chapter-metric-value { font-size: 25px; }
  .chapter-progress .metric-footnote { font-size: 11px; line-height: 1.5; }
  .chapter-progress .chapter-coverage { font-size: 12px; }
  .chapter-progress .chapter-overview-grid > .chapter-explore { justify-content: flex-start; }
}

/* Softer light surfaces; layered charcoal instead of near-black. */
:root, :root[data-theme=dark] {
  --ground: #1b1d22;
  --ground-2: #252830;
  --surface-2: #30343d;
  --surface-3: #3b404a;
  --ink: #edf0f5;
  --ink-2: #bcc3cf;
  --muted: #a1aab8;
  --cyan: #6bcbd7;
  --pale: #283e46;
  --line: rgba(228,233,241,.17);
  --violet: #b39bea;
  --native-shadow: 0 1px 2px #0002, 0 8px 28px #00000012;
}
:root[data-theme=light] {
  --ground: #e9ebee;
  --ground-2: #f3f4f6;
  --surface-2: #e0e3e8;
  --surface-3: #d4d8df;
  --ink: #242b35;
  --ink-2: #505b6a;
  --muted: #626e7e;
  --cyan: #247787;
  --pale: #dcebef;
  --line: #cbd1da;
  --violet: #7850b1;
  --native-shadow: 0 1px 2px #252b3505, 0 8px 24px #252b3507;
}

/* A compact review workspace that stays useful through a long completed test. */
.review-evidence { padding: 18px 20px; border: 1px solid var(--hairline); border-radius: 12px; background: var(--ground-2); }
.review-evidence strong { display: block; font: 650 15px var(--ui-font); margin-bottom: 6px; }
.review-evidence span { display: block; font: 12px/1.7 var(--ui-font); color: var(--ink-2); }
.review-tools {
  position: sticky;
  top: calc(var(--header-height) + 10px);
  z-index: 30;
  padding: 16px 18px;
  border: 1px solid var(--hairline);
  border-radius: 16px;
  background: color-mix(in srgb, var(--ground-2) 94%, transparent);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  box-shadow: var(--native-shadow);
}
.review-tools-top { display: flex; align-items: center; gap: 12px; margin-bottom: 12px; }
.review-search { display: flex; align-items: center; gap: 10px; flex: 1; min-width: 0; background: var(--ground); border: 1px solid var(--hairline); border-radius: 10px; padding: 0 12px; }
.review-search:focus-within { outline: 2px solid var(--cyan); outline-offset: 2px; }
.review-search input { border: 0; box-shadow: none; background: transparent; min-width: 0; width: 100%; height: 42px; padding: 0; font: 13px var(--ui-font); color: var(--ink); outline: none; }
.review-search > svg { width: 16px; color: var(--ink-2); flex-shrink: 0; }
.review-tools .native-secondary { min-height: 42px; padding: 10px 14px; font-size: 12px; white-space: nowrap; }
.review-download { display: inline-flex; align-items: center; gap: 6px; font: 12px var(--ui-font); color: var(--ink-2); text-decoration: none; padding: 10px 0 10px 6px; white-space: nowrap; }
.review-download svg { width: 15px; }
.review-tools .review-filter { display: flex; flex-wrap: wrap; gap: 8px; border: 0; padding: 0; }
.review-tools .review-filter button { display: inline-flex; align-items: center; gap: 8px; font: 500 12px var(--ui-font); min-height: 38px; padding: 8px 12px; border-radius: 9px; }
.review-tools .review-filter button.active { color: var(--cyan); background: var(--pale); border-color: color-mix(in srgb, var(--cyan) 40%, var(--hairline)); }
.review-count { padding: 2px 6px; border-radius: 5px; background: color-mix(in srgb, var(--ink) 7%, transparent); font: 600 11px var(--ui-font); font-variant-numeric: tabular-nums; }
.review-visible-count { font: 11px/1.5 var(--ui-font); color: var(--muted); margin: 10px 0 0; }
.review-question { scroll-margin-top: calc(var(--header-height) + 190px); }
.review-result-label { font: 650 12px var(--ui-font); padding: 5px 9px; border: 1px solid currentColor; border-radius: 7px; }
.review-result-label[data-result=green] { color: var(--green); }
.review-result-label[data-result=amber] { color: var(--amber); }
.review-result-label[data-result=red] { color: var(--red); }
.review-first-score { font: 500 11px var(--ui-font); color: var(--ink-2); }
.review-first-check { border: 1px solid var(--hairline); border-radius: 10px; }
.review-first-check > summary { padding: 12px 14px; cursor: pointer; font: 600 12px/1.6 var(--ui-font); color: var(--ink-2); }
.review-first-check .answer-box { margin: 0 14px 14px; padding: 16px; background: var(--ground); border-radius: 9px; }
.review-practice { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 10px; }
.review-practice > span { font: 12px/1.6 var(--ui-font); color: var(--ink-2); }
.review-practice button { font-size: 12px; padding: 10px 14px; min-height: 42px; }
.review-practice-choices { display: flex; flex-wrap: wrap; gap: 8px; flex-shrink: 0; }
.review-first-check .small { margin-top: 14px; }
.review-question [id^=note-status] { display: inline-block; margin-left: 10px; font-size: 12px; }
@media(max-width:800px) {
  .review-tools { padding: 12px; top: var(--header-height); border-radius: 12px; }
  .review-tools-top { flex-wrap: nowrap; gap: 8px; margin-bottom: 10px; }
  .review-search { flex-basis: auto; }
  .review-tools #review-expand { font-size: 0; padding-inline: 10px; }
  .review-tools #review-expand::before { content: 'Explain'; font: 600 11px var(--ui-font); }
  .review-tools #review-expand[aria-pressed=true]::before { content: 'Collapse'; }
  .review-tools .review-filter { flex-wrap: nowrap; overflow-x: auto; scrollbar-width: thin; padding-bottom: 4px; }
  .review-tools .review-filter button { flex-shrink: 0; min-height: 36px; padding: 7px 10px; }
  .review-visible-count { margin-top: 6px; }
  .review-download { margin-left: 0; padding: 10px 2px; }
  .review-download > span { display: none; }
  .review-download svg { width: 18px; }
  .review-practice { align-items: flex-start; flex-direction: column; gap: 8px; }
  .review-question { scroll-margin-top: calc(var(--header-height) + 205px); }
}

@media(max-width:800px) { .topbar .nav-btn::after { bottom: 0; } }
@media(max-width:800px) {
 .topbar nav { height: 36px; min-height: 36px; }
 .topbar .nav-btn { height: 36px !important; min-height: 36px; }
}