/* Same palette, spacing and controls as the O level international bank.
   This layer changes presentation only; worksheet print rules stay intact. */
@media screen {
  :root{--ink:#394f66;--body:#435970;--muted:#7b898f;--line:#ddd9cc;--canvas:#f3f1e8;--green:#435970;--library-ink:#435970;--library-blue:#435970;--library-line:#ddd9cc;font-family:"Segoe UI",Arial,sans-serif;background:var(--canvas);color:var(--body)}
  body{background:#f3f1e8;font-family:"Segoe UI",Arial,sans-serif;color:#435970}
  .reference-chrome.site-header{position:sticky;top:0;z-index:40;max-width:none;height:auto;min-height:48px;margin:0;padding:7px 14px;display:flex;align-items:center;justify-content:flex-start;flex-wrap:wrap;gap:8px;background:linear-gradient(#151b22,#0c1015);border-bottom:2px solid #c5a353;color:#e4d494;font:12px/1.3 Consolas,monospace}
  .reference-chrome .chrome-link,.reference-chrome .periodic-table-link,.reference-chrome #openSelection,.chrome-content>summary{color:#e4d494;text-decoration:none;border:1px solid #8e783f;background:transparent;border-radius:0;padding:6px 9px;font:11px/1.4 Consolas,monospace;text-transform:uppercase;white-space:nowrap}
  .reference-chrome .chrome-link:hover,.reference-chrome .periodic-table-link:hover,.reference-chrome #openSelection:hover,.chrome-content>summary:hover{background:#302b20;color:#f5df9a}
  .reference-chrome .chrome-title{font:12px/1.4 Consolas,monospace;color:#efe2b5;padding-left:5px;white-space:nowrap}
  .reference-chrome .header-actions{display:flex;gap:8px;margin-left:auto;align-items:center;max-width:none;flex-wrap:wrap}
  .reference-chrome .course-pills{order:initial;gap:0;width:auto;display:flex}
  .reference-chrome .course-pill{min-height:30px;padding:5px 10px;border:1px solid #8e783f;font:11px/1.4 Consolas,monospace;border-radius:0;background:#171c21;color:#e4d494}
  .reference-chrome .course-pill[aria-pressed=true]{background:#cfb45c;color:#171c21}
  .syllabus-caption{text-transform:uppercase;font:10px Consolas,monospace;color:#b5aa88}
  .chrome-content{position:relative}.chrome-content>summary{list-style:none;cursor:pointer}.chrome-content>summary::-webkit-details-marker{display:none}.chrome-content>summary:after{content:' ▾'}.chrome-content[open]>summary:after{content:' ▴'}
  .chrome-content nav{position:absolute;right:0;top:calc(100% + 12px);min-width:285px;background:#12161c;border:2px solid #8e783f;box-shadow:0 15px 30px #0004;border-radius:12px;padding:12px;display:grid;gap:3px;z-index:50}
  .chrome-content nav a{color:#eee0b4;padding:12px;text-decoration:none;border-radius:7px;font:14px/1.5 "Segoe UI",Arial,sans-serif}.chrome-content nav a:hover{background:#2b291f}
  .page-shell{max-width:1530px;padding:34px 30px 28px;column-gap:38px}
  .intro{margin-bottom:21px}.intro h1{font:700 32px/1.2 "Segoe UI",Arial,sans-serif;letter-spacing:-.02em;color:#394f66;margin:10px 0 16px}.intro-copy{font-size:14px;line-height:1.8;color:#6b7c88;max-width:880px}
  .eyebrow,.library-label{font-size:11px;font-weight:750;letter-spacing:.14em;color:#8c8d84}
  .coverage-strip{gap:30px;margin-bottom:23px}.coverage-cell strong{font-size:27px;color:#435970}.coverage-cell{min-height:65px}.coverage-cell small{color:#82908d}
  .filter-panel{top:80px;max-height:calc(100vh - 100px)}
  .library-nav button,.topic-nav-button{font-size:13px;padding:10px 12px;border-radius:9px;color:#67798b}.library-nav button.active,.topic-nav-button.active{background:#435970;color:white;font-weight:700}
  .library-nav{margin-bottom:30px}.library-filterbar{gap:9px;margin-bottom:16px}.library-filterbar .field select,.library-filterbar .search-box{height:44px;min-height:44px;border:1px solid #ddd9cc;border-radius:23px}.library-filterbar .field{font-size:11px;color:#7c888b}.library-filterbar .field select{font-size:12px;color:#485963;padding:10px 13px}.search-box input{font-size:13px!important}
  .scope-controls{display:flex;align-items:center;gap:16px;flex-wrap:wrap;margin:15px 0 23px;padding:0}.scope-controls .field{min-width:240px}.scope-controls select{border-radius:9px;background:#fff;padding:10px 12px;font-size:12px}.scope-controls p{flex:1;min-width:240px;max-width:760px;font-size:12px;line-height:1.7;color:#778893;margin:0}
  .view-tabs{border-bottom:1px solid #ddd9cc}.results-toolbar{margin:20px 0}.results-toolbar h2{font-size:17px}.results-toolbar p{font-size:13px}.sort-field select{border:1px solid #ddd9cc;border-radius:20px;background:white}
  .topic-section{background:#fffefa;border:1px solid #ddd9cc;border-radius:19px;padding:23px 24px;margin:22px 0;box-shadow:0 6px 19px #293b4609}
  .topic-section-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;border-bottom:2px solid #ece8da;padding-bottom:14px;margin-bottom:16px}.topic-section-heading h2{font-size:21px;margin:0;line-height:1.4;color:#435970}.topic-total{background:#f0eddf;border-radius:18px;padding:4px 11px;color:#7c7c6a;font-size:11px;white-space:nowrap}
  .topic-question-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;align-items:start}.topic-question-grid>.library-question{margin:0;box-shadow:none;min-width:0}.topic-question-grid>.library-question[open]{grid-column:1/-1}.topic-question-grid .library-question:not([open]) .card-excerpt{display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.topic-more{display:block;margin:18px auto 0;border:1px solid #ddd9cc;border-radius:22px;padding:10px 19px;background:#faf9f4;color:#435970;font-size:12px;max-width:100%}
  .library-question{border:1px solid #ddd9cc;border-radius:14px;box-shadow:0 3px 8px #293b4610;scroll-margin-top:85px}.library-question-summary{padding:18px 20px;gap:13px}.library-question .card-title{font-size:13px;font-weight:700;color:#5b82a5}.library-question .card-excerpt{font-size:14px;line-height:1.6;color:#435970}.library-question-content{padding:0 20px 20px}.card-metadata,.card-topics{font-size:11px!important;color:#8a8e85!important}
  .course-badges{display:flex;gap:5px;align-items:center;flex-wrap:wrap}.course-badge{font-size:9px;font-weight:700;line-height:1.5;text-transform:uppercase;border:0;border-radius:10px;padding:2px 7px;background:#e9edf1;color:#526577}.type-badge{background:#e4edf7;color:#4b6c94}
  .oos-badge{display:inline-block;font:700 10px/1.5 "Segoe UI",Arial,sans-serif;color:#755406;background:#fff4c6;border:1px solid #ddc477;border-radius:5px;padding:2px 6px;margin:2px 4px 2px 0;white-space:nowrap}
  .question-scope-note{border:1px solid #e3d7a9;border-radius:9px;background:#fffbeb;color:#74643c;padding:13px 16px;font-size:12px;margin:13px 0;line-height:1.65}.question-scope-note p{margin:7px 0}.scope-review-note{font-size:11px;color:#81775c}
  .library-question.sg-relevant,.library-question.sg-relevant>.library-question-summary,.practice-panel.sg-relevant{background:#eaf5e9;border-color:#b5d2b3}
  .library-question.sg-partial,.library-question.sg-partial>.library-question-summary{background:#fdebd3;border-color:#f0b56b}.library-question.sg-notrel,.library-question.sg-notrel>.library-question-summary{background:#fbeaea;border-color:#e0b4b4}
  .oos-badge.oos-partial{color:#8a4b08;background:#fde3bf;border-color:#eea24a}.oos-badge.oos-notrel{color:#8f2d2d;background:#f9d9d9;border-color:#e0a4a4}.reader-tabs{background:transparent}.reader-panel{background:#fff;border:1px solid #efeee9;border-radius:8px;padding:14px}.reader-source-links{gap:7px}.source-chip{font-size:12px;border-radius:18px;border:1px solid #ddd9cc;padding:6px 11px;color:#526b80;background:#fff}.camera-button{font-weight:650;white-space:nowrap}.reader-tab{color:#7e8c91;font-size:12px}.reader-tab[aria-selected=true]{color:#435970;border-color:#435970}
  .library-panel{border-color:#ddd9cc;border-radius:14px}.practice-panel h2{margin-bottom:12px}.practice-progress{font-size:13px;color:#627d6f;background:#f2f4ec;border-radius:9px;padding:12px 15px}.practice-tools{display:flex;gap:9px;align-items:center;flex-wrap:wrap;margin:17px 0}.practice-reset-confirm{display:flex;gap:8px;flex-wrap:wrap;align-items:center;background:#fff4d5;border-radius:8px;padding:13px;font-size:12px}.practice-nav{display:flex;justify-content:space-between;gap:12px;margin:18px 0}.practice-question-number{font-size:17px;font-weight:700;line-height:1.6;margin:20px 0 6px}.practice-panel>.question-body{background:white;border:1px solid #e6e5de;border-radius:8px;padding:16px;margin:16px 0}.practice-options{gap:10px}.practice-choice{min-width:62px;min-height:45px;border:1px solid #bfc9cb;border-radius:8px;padding:10px 18px;background:white;font-size:15px}.practice-choice.correct{background:#e4f0dc;border:2px solid #719460;color:#2e572b}.practice-choice.incorrect{background:#fbece7;border:2px solid #b87664;color:#863e30}.practice-result{font-size:14px;line-height:1.7}.practice-explanation:not(:empty){margin-top:18px;background:white;border:1px solid #dce3d7;border-radius:9px;padding:15px}.button-dark{background:#435970}.button-light{border-color:#ddd9cc;color:#435970}.page-footer{color:#96988e;font-size:12px}
  .source-scroll-hint{display:none}.checked-answer .question-body{font-family:"Segoe UI",Arial,sans-serif}
  @media(max-width:760px){.source-scroll-hint{display:block;font:11px/1.6 "Segoe UI",Arial,sans-serif;color:#7b898f;margin:12px 0 5px}.reader-panel .question-body,.practice-panel>.question-body{overflow-x:auto;max-width:100%;overscroll-behavior-x:contain}.reader-panel .question-body img[alt^="Original question"],.practice-panel>.question-body img[alt^="Original question"]{width:700px;max-width:none;height:auto}}
  button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,summary:focus-visible{outline:3px solid #86b4d5;outline-offset:3px}
  @media(min-width:1600px){.topic-question-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
  @media(max-width:1200px){.chrome-title{display:none!important}.reference-chrome .header-actions{gap:6px}.syllabus-caption{display:none}}
  @media(max-width:760px){.reference-chrome.site-header{position:sticky;padding:7px 9px;gap:6px}.reference-chrome .header-actions{margin-left:0;width:100%;max-width:none;justify-content:flex-start}.reference-chrome .course-pills{margin-left:auto}.reference-chrome .course-pill{font-size:10px;padding:6px}.reference-chrome .chrome-link,.reference-chrome .periodic-table-link,.reference-chrome #openSelection,.chrome-content>summary{font-size:10px;padding:6px}.reference-chrome #openSelection .count-bubble{height:16px;min-width:17px;font-size:9px}.page-shell{padding:24px 14px}.intro h1{font-size:28px}.intro-copy{font-size:14px}.coverage-strip{gap:15px}.coverage-cell strong{font-size:23px}.filter-panel{display:block;margin-bottom:18px;max-height:none}.library-nav{margin-bottom:15px}.topic-nav{display:flex;overflow-x:auto;max-width:100%}.topic-nav-button{white-space:nowrap;width:auto}.topic-section{padding:16px 14px;border-radius:15px}.topic-section-heading h2{font-size:18px}.topic-question-grid{display:block}.topic-question-grid>.library-question{margin:10px 0}.topic-total{font-size:10px;padding:4px 7px}.library-question-summary{padding:14px}.library-question-content{padding:0 12px 15px}.scope-controls{display:block}.scope-controls .field{margin-bottom:10px}.scope-controls p{min-width:0}.reader-panel{padding:10px}.chrome-content nav{right:auto;left:0;max-width:90vw;min-width:265px}.practice-question-number{font-size:15px}.practice-choice{min-width:55px}.results-toolbar{gap:12px}.question-scope-note{padding:11px}}
}
@media print{.scope-controls,.chrome-content,.oos-badge{display:none!important}}

@media screen{.release-notice{grid-column:2;margin:0 0 20px;padding:13px 17px;background:#faf4dc;border:1px solid #e5dbb6;border-radius:11px;color:#7c704d;font-size:12px;line-height:1.7}.intro{grid-row:1}.release-notice{grid-row:2}.coverage-strip{grid-row:3!important}.results-panel{grid-row:4!important}.filter-panel{grid-row:1/span 4!important}.page-footer{grid-row:5!important}@media(max-width:760px){.release-notice{margin-bottom:20px}}}