main{max-width:1040px}.setup,.results{max-width:692px;margin-inline:auto}.quiz-nav{display:flex;gap:8px}.intro h1{font-size:clamp(40px,7vw,56px)}.intro p{font-size:18px}.challenge-preview{margin:-3px 0 20px;padding:19px 22px;background:var(--navy);color:white;border-radius:16px}.preview-grades{display:grid;grid-template-columns:repeat(9,1fr);gap:6px}.preview-grades span{display:grid;place-items:center;aspect-ratio:1.1;font-size:18px;font-weight:700;border:1px solid #ffffff38;border-radius:7px;background:#ffffff0c}.preview-grades span:last-child{background:var(--gold);border-color:var(--gold);color:var(--navy)}.challenge-preview p{font-size:13px;line-height:1.6;color:#dce5f0;margin:12px 0 0}.challenge-preview strong{color:white}.selection-summary{margin-bottom:18px}.rules{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;padding-top:18px;border-top:1px solid var(--line)}.rules strong,.rules span{display:block}.rules strong{font-size:14px}.rules span{font-size:11px;color:var(--muted);line-height:1.5;margin-top:5px}.best-climb{display:flex;align-items:baseline;gap:14px;background:var(--wash);border-radius:11px;padding:15px;margin-top:16px}.best-climb strong{font-size:24px;letter-spacing:-.5px}.best-climb>span{font-size:12px;color:var(--muted)}.grade-note{font-size:12px;color:var(--muted);line-height:1.6;text-align:center;max-width:620px;margin:12px auto 0}.game-layout{display:grid;grid-template-columns:minmax(0,1fr) 212px;gap:20px;align-items:start}.level-status{display:flex;justify-content:space-between;gap:16px;padding:17px 22px;background:var(--navy);color:white;border-radius:16px;margin-bottom:14px}.level-status>div{display:flex;flex-direction:column;gap:5px}.level-status>div:last-child{text-align:right}.level-status span{font-size:11px;color:#ced9e7}.level-status strong{font-size:25px;letter-spacing:-.5px}.level-status>div:last-child strong{font-size:21px}.question-card h2{font-size:clamp(21px,2.5vw,27px);line-height:1.42;white-space:pre-line;min-height:0;letter-spacing:-.3px}.answer-button{font-size:16px;min-height:78px;line-height:1.45;align-items:flex-start}.answer-letter{margin-top:1px}.correct-feedback{margin-top:19px;border-top:1px solid var(--line);padding-top:1px}.explanation{font-size:14px;line-height:1.65;margin:9px 0 0;color:#42556c;white-space:pre-line}.next-button{margin-top:19px;font-size:15px;min-height:49px}.ladder-panel{border:1px solid var(--line);border-radius:18px;background:white;padding:19px;position:sticky;top:20px}.ladder-heading h2{font-size:15px;margin:0}.ladder-heading p{font-size:11px;color:var(--muted);margin:6px 0 15px;line-height:1.5}.grade-ladder{display:flex;flex-direction:column-reverse;list-style:none;padding:0;margin:0;gap:6px}.grade-ladder li{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:37px;padding:8px 10px;border-radius:8px;color:#69788b;font-size:12px;border:1px solid #e5eaf0}.grade-ladder strong{font-size:14px;color:inherit}.grade-ladder .ladder-state{font-size:10px}.grade-ladder .current{background:var(--navy);border-color:var(--navy);color:white}.grade-ladder .cleared{background:#fff7d1;border-color:#e8d47f;color:#604800}.ladder-rule{font-size:10px;line-height:1.6;color:var(--muted);margin:14px 0 0}.working-tools{background:white;border:1px solid var(--line);border-radius:13px;padding:0 18px;margin-top:13px}.working-tools>summary{min-height:49px;padding:16px 0;font-size:13px;font-weight:700}.working-tools label{display:block;font-size:13px;font-weight:700;margin:0 0 8px}.working-tools label span{font-weight:400;color:var(--muted);font-size:11px}.working-tools textarea,.working-tools input{font:inherit;color:var(--ink);border:1px solid #acbacb;border-radius:8px;padding:11px;width:100%;min-height:44px;background:white;font-size:15px}.working-tools textarea{resize:vertical;max-height:400px}.working-tools input:focus-visible,.working-tools textarea:focus-visible{outline:3px solid #c28c00;outline-offset:2px}.working-tools form{margin:19px 0 16px}.working-tools form p{font-size:11px;line-height:1.5;color:var(--muted);margin:0 0 10px}.calculator-row{display:flex;gap:8px}.calculator-row input{min-width:0;flex:1}.calculator-row button{flex-shrink:0;background:var(--wash);border-color:#acbacb}.working-tools output{display:block;min-height:20px;font-size:14px;line-height:1.5;margin-top:11px;overflow-wrap:anywhere}.working-tools output.error{color:var(--error)}.result-grade>span{font-size:12px;color:var(--muted)}.result-grade strong{font-size:61px;line-height:1.12;letter-spacing:-2.5px;display:block;margin-top:8px}.result-grade strong.starting{font-size:34px;letter-spacing:-1px;max-width:350px;margin-inline:auto}.result-grade p{font-size:13px;line-height:1.5;color:var(--muted);margin:12px 0 0}.result-stats{grid-template-columns:repeat(2,1fr)}.result-stats #result-best{font-size:20px}.result-card .grade-note{font-size:11px}.elimination-review{padding:22px;line-height:1.65;font-size:14px}.elimination-review h2{font-size:17px;margin:0 0 13px}.elimination-review p{margin:8px 0;white-space:pre-line}.review-meta{font-size:12px;color:var(--muted)}.review-question{font-weight:700}.elimination-review .review-answer{color:var(--success);font-weight:700}.elimination-review #missed-explanation{padding-top:12px;margin-top:13px;border-top:1px solid var(--line);color:#42556c}.history-list .history-score{font-size:17px;text-align:right;white-space:normal;max-width:47%;line-height:1.3}.history-score small{font-size:11px}.header-inner{max-width:1040px}
@media(max-width:760px){main{max-width:740px}.game-layout{display:flex;flex-direction:column;gap:12px}.question-area{width:100%;order:2}.ladder-panel{position:static;width:100%;padding:13px 15px;order:1}.ladder-heading{display:flex;justify-content:space-between;gap:12px;align-items:baseline;margin-bottom:10px}.ladder-heading h2{font-size:12px}.ladder-heading p{font-size:11px;margin:0;text-align:right}.grade-ladder{display:grid;grid-template-columns:repeat(9,minmax(0,1fr));gap:5px}.grade-ladder li{padding:7px 0;min-height:32px;justify-content:center;border-radius:6px}.grade-ladder strong{font-size:13px}.grade-ladder .ladder-state,.grade-ladder .grade-word{display:none}.ladder-rule{display:none}.level-status{padding:14px 18px;margin-bottom:12px}.level-status strong{font-size:23px}.level-status>div:last-child strong{font-size:20px}.question-card h2{font-size:23px}.quiz-nav .header-link{font-size:12px}.quiz-nav{gap:6px}}
@media(max-width:520px){.challenge-preview{padding:17px}.preview-grades{gap:5px}.preview-grades span{font-size:15px}.challenge-preview p{font-size:12px}.rules{gap:9px}.rules strong{font-size:12px}.rules span{font-size:10px}.best-climb{align-items:flex-start;flex-direction:column;gap:5px}.best-climb strong{font-size:23px}.game .question-card h2{font-size:21px;line-height:1.45;margin:15px 0 18px}.answers{grid-template-columns:1fr}.game .answer-button{min-height:60px;font-size:15px;padding:13px 12px;gap:10px;align-items:center}.game .answer-button.correct,.game .answer-button.incorrect{padding:12px 11px}.answer-letter{margin-top:0}.game .question-card{padding:19px 17px}.keyboard-hint{display:none}.result-grade strong{font-size:53px}.result-grade strong.starting{font-size:31px}.elimination-review{padding:20px 18px}.header-inner{flex-wrap:wrap;gap:0 10px;padding-block:6px}.brand{margin-right:auto}.quiz-nav{margin-left:auto}.quiz-nav .header-link{font-size:11px;padding:8px}.grade-note{font-size:11px}.intro p{font-size:17px}.selection-tools{top:-10px}.paper-fieldset legend{font-size:16px}}
@media(max-width:350px){.header-inner{justify-content:center;padding:5px 12px}.brand{margin:auto}.quiz-nav{margin:auto;width:100%;justify-content:center}.quiz-nav .header-link{min-height:36px;padding:6px 12px}.paper-fieldset legend{margin-bottom:47px}.selection-tools{top:18px;left:0;right:auto}.grade-ladder{gap:3px}.rules{grid-template-columns:1fr}.rules>div{display:flex;align-items:baseline;gap:8px}.rules span{font-size:11px}.calculator-row{flex-wrap:wrap}.calculator-row input{flex-basis:100%}}

/* Paired-grade progression: 17 compact steps, from 1–1 to 9–9. */
.preview-grades span{aspect-ratio:auto;min-height:36px;font-size:13px}.preview-grades span:last-child{grid-column:span 2}
.grade-ladder{display:grid;grid-template-columns:repeat(2,minmax(0,1fr))}.grade-ladder li{min-height:31px;padding:7px 8px;gap:4px}.grade-ladder li:last-child{grid-column:1/-1}
.result-grade strong{font-size:clamp(38px,7vw,58px);letter-spacing:-1.8px}
@media(max-width:760px){.grade-ladder{grid-template-columns:repeat(9,minmax(0,1fr));gap:5px}.grade-ladder li{padding:7px 0;min-height:29px}.grade-ladder strong{font-size:12px}}
@media(max-width:520px){.level-status>div:last-child strong{font-size:17px}.level-status strong{font-size:22px}}