.ap-shell{--ap-ink:#142c3e;--ap-accent:#126b68;--ap-line:#d8e3e8;--ap-soft:#f0f7f7;max-width:1160px;margin:0 auto;padding:38px 22px 64px;color:var(--ap-ink);font:16px/1.6 system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif}.ap-shell *{box-sizing:border-box}.ap-shell [hidden]{display:none!important}.ap-shell h1{font-size:clamp(30px,5vw,44px);line-height:1.15;margin:6px 0 16px;letter-spacing:-.03em}.ap-shell h2{font-size:25px;line-height:1.3;margin:10px 0}.ap-shell h3{font-size:19px}.ap-shell p{margin:10px 0 16px}.ap-shell a{color:#11635f}.ap-heading{margin:14px 0 30px;max-width:760px}.ap-eyebrow{font-size:12px;font-weight:750;letter-spacing:.12em;color:var(--ap-accent)}.ap-muted{color:#576a78;font-size:14px}.ap-back{display:inline-block;margin-bottom:16px;text-decoration:none}.ap-mode-grid,.ap-score-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;margin:24px 0}.ap-mode{display:flex;flex-direction:column;padding:30px;border:1px solid var(--ap-line);border-radius:16px;background:linear-gradient(135deg,#f0f8f6,#fff);text-decoration:none!important;transition:border-color .15s,box-shadow .15s}.ap-mode:nth-child(2){background:linear-gradient(135deg,#f0f4fb,#fff)}.ap-mode h2{font-size:30px;color:var(--ap-ink)}.ap-mode p{color:#476171;flex:1}.ap-mode strong{padding-top:16px}.ap-mode:hover,.ap-mode.selected{border-color:var(--ap-accent);box-shadow:0 7px 22px #13354210}.ap-panel{background:#fff;border:1px solid var(--ap-line);border-radius:13px;padding:25px;margin:20px 0}.ap-tabs{display:flex;gap:24px;border-bottom:1px solid var(--ap-line);margin-bottom:24px}.ap-tabs a{padding:12px 4px;text-decoration:none;font-weight:650}.ap-tabs [aria-current]{border-bottom:3px solid var(--ap-accent)}.ap-filters{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;background:#f7fafb}.ap-shell label{font-size:14px;font-weight:600}.ap-shell select,.ap-shell input[type=number]{display:block;width:100%;min-height:44px;border:1px solid #a7bbc6;border-radius:7px;padding:9px;background:#fff;color:var(--ap-ink);font:inherit;margin-top:5px}.ap-filter{max-width:560px;display:grid;gap:9px}.ap-filter .ap-btn{justify-self:start;margin-top:8px}.ap-shell .ap-btn{display:inline-flex;align-items:center;justify-content:center;gap:7px;min-height:44px;border-radius:7px;padding:9px 18px;border:1px solid var(--ap-accent);background:var(--ap-accent);color:#fff;text-decoration:none;font:600 14px/1.5 system-ui;cursor:pointer}.ap-shell .ap-btn.secondary{background:#fff;color:var(--ap-accent)}.ap-shell .ap-btn:hover{filter:brightness(.94)}.ap-shell button:disabled{opacity:.5;cursor:default}.ap-shell :focus-visible{outline:3px solid #df9d13;outline-offset:3px}.ap-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin:20px 0 8px}.ap-filters>.ap-actions{grid-column:1/-1;margin-top:0}.ap-question-meta{display:flex;justify-content:space-between;gap:12px;color:#576a78;font-size:13px;margin-bottom:12px}.ap-stem{font-size:18px;margin:20px 0;line-height:1.9}.ap-math{white-space:pre-wrap;overflow-wrap:anywhere;min-width:0}.ap-math mjx-container[display=true]{overflow-x:auto;overflow-y:hidden;padding:5px 0;max-width:100%}.ap-option{display:flex;gap:12px;align-items:baseline;border:1px solid var(--ap-line);border-radius:8px;padding:12px 15px;margin:10px 0;cursor:pointer;font-weight:400!important}.ap-option:has(input:checked){background:var(--ap-soft);border-color:var(--ap-accent)}.ap-option input,.ap-flag{accent-color:var(--ap-accent);flex-shrink:0}.ap-option .ap-math{flex:1}.ap-feedback,.ap-exam-feedback{font-size:14px;min-height:22px}.ap-feedback.error,.ap-exam-feedback.error{color:#a12424}.ap-solution{background:var(--ap-soft);border-left:4px solid var(--ap-accent);padding:20px;border-radius:6px;margin-top:18px}.ap-result-label{font-weight:750;margin-bottom:14px}.ap-table-wrap{overflow-x:auto}.ap-table{border-collapse:collapse;width:100%;font-size:14px}.ap-table th{text-align:left;background:#f2f7f8}.ap-table th,.ap-table td{padding:12px;border-bottom:1px solid var(--ap-line)}.ap-exam-bar{display:flex;justify-content:space-between;gap:20px;align-items:center;position:sticky;top:0;z-index:10;background:#fff;border-bottom:1px solid var(--ap-line);padding:12px 0}.ap-exam-bar h1{font-size:27px;margin:5px 0}.ap-exam-bar .ap-eyebrow{margin:0}.ap-timer{font-size:29px;line-height:1.3;font-weight:700;font-variant-numeric:tabular-nums;text-align:right}.ap-timer.urgent{color:#a12424}.ap-exam-layout{display:grid;grid-template-columns:155px minmax(0,1fr);gap:24px}.ap-question-nav{display:flex;align-content:start;flex-wrap:wrap;gap:7px;padding-top:20px}.ap-question-nav button{width:42px;height:42px;position:relative;border:1px solid #8caab8;background:white;border-radius:6px;color:var(--ap-ink);cursor:pointer;font:600 14px system-ui}.ap-question-nav button.answered{background:#d7efeb}.ap-question-nav button.active{border:2px solid var(--ap-accent);box-shadow:0 0 0 2px #126b6825}.ap-question-nav button.flagged:after{content:'★';position:absolute;top:-7px;right:-3px;color:#775300;background:#fff8db;border-radius:50%;font-size:13px}.ap-question-nav p{width:100%;font-size:12px}.ap-calculator-rule{background:#ecf4fb;border-radius:7px;padding:10px 15px;margin-top:20px;font-size:14px;font-weight:650}.ap-break{text-align:center;padding:50px 24px;max-width:740px;margin:40px auto}.ap-score-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.ap-score-grid .ap-panel{margin:0}.ap-score-grid p{font-size:13px;color:#576a78}.ap-score-grid h2{font-size:34px}.ap-review summary{cursor:pointer;font-weight:700;padding:4px 0}.ap-self-score{display:flex;gap:14px;align-items:end;flex-wrap:wrap;background:#f3f7f8;padding:15px;border-radius:8px;margin-top:20px}.ap-self-score input{max-width:160px}.ap-self-score .ap-feedback{margin:0}.ap-position{font-size:14px;color:#576a78}@media(max-width:720px){.ap-shell{padding:24px 15px 45px}.ap-mode-grid,.ap-score-grid{grid-template-columns:1fr;gap:14px}.ap-mode{padding:23px}.ap-filters{grid-template-columns:1fr 1fr;padding:18px}.ap-panel{padding:19px}.ap-exam-layout{grid-template-columns:1fr;gap:0}.ap-question-nav{gap:8px;padding-top:8px}.ap-question-nav p{margin:2px 0}.ap-exam-bar h1{font-size:21px}.ap-exam-bar .ap-eyebrow{font-size:10px}.ap-timer{font-size:25px}.ap-question-meta{flex-direction:column;gap:2px}.ap-stem{font-size:17px}.ap-shell .ap-btn{padding:9px 13px}}@media(max-width:420px){.ap-filters{grid-template-columns:1fr}.ap-exam-bar{gap:10px}.ap-exam-bar .ap-muted{font-size:11px}}@media print{header,footer,.ap-back,.ap-actions,.ap-tabs,.ap-self-score,.ap-filters{display:none!important}.ap-shell{max-width:none;padding:0;font-size:11pt}.ap-panel{break-inside:avoid;border:1px solid #ccc;box-shadow:none}.ap-score-grid{display:flex}.ap-review{break-inside:auto}.ap-shell a{color:inherit;text-decoration:none}}
.ap-shell section.ap-heading,.ap-shell section.ap-exam{padding:0}.ap-exam-bar{top:76px}

/* Immediate practice-answer feedback. */
.ap-feedback.correct{color:#17613a;font-weight:700}
.ap-feedback.error{font-weight:650}
.ap-option.is-locked{cursor:default}
.ap-option.is-correct{border-color:#3c9362;background:#e9f7ef;box-shadow:inset 4px 0 0 #3c9362}
.ap-option.is-wrong{border-color:#c65a5a;background:#fff0f0;box-shadow:inset 4px 0 0 #c65a5a}
.ap-option.is-correct b{color:#17613a}
.ap-option.is-wrong b{color:#a12424}
.ap-next-practice{min-height:36px!important;margin-left:8px;padding:5px 13px!important;vertical-align:middle}

/* Readable native-select replacement for AP course and practice filters. */
.ap-shell select {
 -webkit-appearance:none !important; appearance:none !important;
 box-sizing:border-box !important; width:100%; min-width:0;
 height:54px !important; min-height:54px !important;
 padding:12px 42px 12px 14px !important;
 font-family:inherit !important; font-size:17px !important; line-height:1.4 !important;
 background-color:#fff !important; color:var(--ap-ink,#142c3e) !important;
 border:1px solid #a7bbc6 !important; border-radius:7px !important;
 background-image:linear-gradient(45deg,transparent 50%,#24585a 50%),linear-gradient(135deg,#24585a 50%,transparent 50%) !important;
 background-position:calc(100% - 21px) 50%,calc(100% - 15px) 50% !important;
 background-size:6px 6px !important; background-repeat:no-repeat !important;
 margin-top:8px !important;
}
.ap-shell .ap-filters label,.ap-shell .ap-filter label {font-size:15px;line-height:1.5;min-width:0;}
.ap-shell .ap-filters .ap-btn,.ap-shell .ap-filter .ap-btn {min-height:54px; font-size:16px;}
@media(max-width:720px){.ap-shell select{font-size:16px !important;}}