.regelboka-shell.rb-modern{--rb-paper:var(--panel);--rb-paper-deep:var(--ink);--rb-ink:var(--ice);--rb-muted:color-mix(in oklab, var(--ice) 80%, var(--panel));--rb-line:color-mix(in oklab, var(--ice) 30%, var(--panel));--rb-blue:var(--glow);--rb-red:var(--flame);--rb-green:var(--glow);--rb-yellow:color-mix(in oklab, var(--glow) 13%, var(--panel));background:var(--ink);color:var(--ice)}.rb-modern .rb-book{max-width:1100px;min-height:0;box-shadow:none;background:0 0;border:0;border-radius:0;margin:0 auto;animation:none}.rb-modern .rb-book:before,.rb-modern .rb-book:after,.rb-modern .rb-spine,.rb-modern .rb-cover:before,.rb-modern .rb-cover:after,.rb-modern .rb-cover-rule{display:none}.rb-modern .rb-page{max-width:940px;min-height:0;padding:26px 24px 32px}.rb-modern .rb-page-heading{border-bottom:1px solid var(--rb-line);padding-bottom:16px}.regelboka-shell.rb-modern .rb-page-heading h1{font-family:var(--font-display);font-size:clamp(1.8rem,4vw,2.6rem);line-height:1.15}.rb-modern .rb-topic-description{color:var(--rb-muted);max-width:62ch;margin-top:10px;font-size:.95rem}.rb-modern .rb-pencil{font-family:var(--font-body);font-size:1rem;line-height:1.6}.rb-modern .rb-cover{background:var(--rb-paper);color:var(--rb-ink);border:1px solid var(--rb-line);box-shadow:none;border-radius:12px;min-height:0;padding:28px 24px;transform:none}.rb-modern .rb-cover-label{box-shadow:none;background:0 0;border:0;padding:18px 0}.rb-modern .rb-cover h1{font-family:var(--font-display);color:var(--rb-ink);font-size:2.6rem;line-height:1.2}.rb-modern .rb-cover-small,.rb-modern .rb-cover-note{color:var(--rb-muted);font-family:var(--font-body)}.rb-modern .rb-cover .rb-mode-picker{width:100%}.rb-modern .rb-cover .rb-cover-button{margin-top:24px}.rb-modern .rb-contents-inline{padding:28px 18px}.rb-modern .rb-contents-inline h1,.rb-modern .rb-contents-inline h2{font-family:var(--font-display)}.rb-modern .rb-general-rule{margin:16px 0}.rb-modern .rb-general-rule p{color:var(--rb-muted);margin-bottom:8px;font-size:.9rem}.rb-modern .rb-general-rule .rb-math-expression{margin-block:4px}.rb-modern .rb-existing .rb-page-heading h1{font-size:1.6rem}.rb-modern .rb-existing .rb-page{padding:12px 0}.rb-model-controls{flex-wrap:wrap;align-items:center;gap:10px;margin:12px 0;display:flex}.rb-model-controls label{flex:1;gap:6px;min-width:130px;display:grid}.rb-model-controls input{width:100%;min-height:40px;accent-color:var(--rb-blue)}.rb-model-controls button{background:var(--rb-paper);min-height:44px;color:var(--rb-ink);border:1px solid var(--rb-line);border-radius:6px;padding:9px 12px}.rb-model-controls button[aria-pressed=true]{border-color:var(--rb-blue);background:var(--rb-yellow)}.rb-model-result{margin:12px 0;font-weight:600}.rb-model .rb-model-graphic{max-width:420px;display:block}.rb-model .rb-model-graphic text{fill:var(--rb-ink);font-size:18px}.rb-model-graphic .model-line{fill:none;stroke:var(--rb-ink);stroke-width:2px}.rb-model-graphic .model-grid{fill:none;stroke:var(--rb-line);stroke-width:1px}.rb-model-graphic .model-accent{stroke:var(--rb-blue);fill:var(--rb-yellow);stroke-width:3px}.rb-model-graphic .model-water{fill:var(--rb-yellow);stroke:var(--rb-blue);stroke-width:2px}.rb-model-graphic .model-point{fill:var(--rb-blue);stroke:var(--rb-ink);stroke-width:1px}.rb-model .rb-table{border-collapse:collapse;width:100%;margin:12px 0;font-size:.9rem}.rb-model .rb-table td,.rb-model .rb-table th{border:1px solid var(--rb-line);text-align:center;padding:6px 8px}.rb-table .is-selected{background:var(--rb-yellow);font-weight:700}.rb-model .rb-strip{height:44px;margin:14px 0;display:grid}.rb-model .rb-strip span{border:1px solid var(--rb-ink)}.rb-model .rb-strip .is-filled{background:var(--rb-blue)}.rb-percent-grid{aspect-ratio:1;border:1px solid var(--rb-ink);grid-template-columns:repeat(10,1fr);width:min(230px,100%);display:grid}.rb-percent-grid span{border:1px solid var(--rb-line)}.rb-percent-grid .is-filled{background:var(--rb-blue)}@media (width<=600px){.rb-modern .rb-page{padding:20px 4px 26px}.regelboka-shell.rb-modern .rb-page-heading h1{font-size:1.85rem}.rb-modern .rb-page-heading{gap:10px}.rb-modern .rb-rule-picker{gap:6px;margin-block:16px}.rb-modern .rb-rule-picker button{padding:8px 10px;font-size:.9rem}.rb-modern .rb-model{padding:14px 10px}}.rb-modern .rb-page-heading>div{min-width:0}.rb-modern .rb-page-heading h1{overflow-wrap:anywhere}.rb-modern .rb-model svg:not(.rb-model-graphic) text{font-size:24px}.rb-modern .rb-model svg:not(.rb-model-graphic) .rb-cutout-label{font-size:22px}.regelboka-shell:has(.rb-exam){--rb-paper:var(--panel);--rb-paper-deep:var(--ink);--rb-ink:var(--ice);--rb-muted:color-mix(in oklab, var(--ice) 80%, var(--panel));--rb-line:color-mix(in oklab, var(--ice) 30%, var(--panel));--rb-blue:var(--glow);--rb-red:var(--flame);--rb-green:var(--glow);--rb-yellow:color-mix(in oklab, var(--glow) 13%, var(--panel))}.rb-mode-picker{max-width:850px;color:var(--rb-ink);grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin:22px auto;display:grid}.rb-mode-picker button{border:1px solid var(--rb-line);background:var(--rb-paper);min-width:0;min-height:74px;color:inherit;text-align:left;cursor:pointer;border-radius:10px;padding:12px 14px}.rb-mode-picker strong,.rb-mode-picker span{display:block}.rb-mode-picker strong{font-size:.95rem}.rb-mode-picker span{margin-top:5px;font-size:.8rem;line-height:1.4}.rb-mode-picker button[aria-pressed=true]{border:2px solid var(--rb-blue);background:var(--rb-yellow)}.rb-cover .rb-mode-picker{width:88%;margin-bottom:0}.rb-exam{padding-top:36px}.rb-exam .rb-page-heading h1{font-size:clamp(2.25rem,6vw,3.7rem);line-height:1.05}.rb-rule-picker{flex-wrap:wrap;gap:8px;margin:24px 0;display:flex}.rb-rule-picker button,.rb-check-options button,.rb-model>button{border:1px solid var(--rb-line);background:var(--rb-paper);min-height:44px;color:var(--rb-ink);cursor:pointer;text-align:left;border-radius:8px;padding:10px 14px}.rb-rule-picker button[aria-pressed=true],.rb-check-options button[aria-pressed=true],.rb-model button[aria-pressed=true]{border-color:var(--rb-blue);background:var(--rb-yellow);box-shadow:inset 0 0 0 1px var(--rb-blue)}.rb-exam button:focus-visible,.rb-mode-picker button:focus-visible,.rb-exam summary:focus-visible,.rb-exam a:focus-visible,.rb-exam input:focus-visible{outline:3px solid var(--rb-blue);outline-offset:3px}.rb-rule-content h2{margin:15px 0 12px;font-size:1.65rem;font-weight:700;line-height:1.2}.rb-exam h3{margin-bottom:8px;font-weight:700}.rb-exam p{line-height:1.6}.rb-exam-link{color:var(--rb-muted);font-size:.82rem}.rb-rule-goal{margin:12px 0 20px}.rb-exam .rb-rule{border-radius:0 8px 8px 0;margin:18px 0}.rb-exam .rb-rule p{font-weight:500}.rb-explain{border:1px solid var(--rb-line);background:var(--rb-paper);border-radius:8px;margin:16px 0;padding:14px 16px}.rb-explain summary{cursor:pointer;min-height:28px;font-weight:600}.rb-explain[open] summary{margin-bottom:12px}.rb-example{border:1px solid var(--rb-line);background:var(--rb-paper);border-radius:12px;margin:25px 0;padding:20px}.rb-example ol{counter-reset:rb-step;gap:18px;padding:0;list-style:none;display:grid}.rb-example li{min-width:0}.rb-example li p{color:var(--rb-muted);margin-top:5px;font-size:.9rem}.rb-exam .rb-math-expression{color:var(--rb-ink);font-size:1.2rem}.rb-exam .rb-math-expression.is-display{text-align:left;padding-block:8px}.rb-exam .katex-display>.katex{text-align:left}.rb-condition{margin-bottom:16px;font-size:.9rem}.rb-copy-label{margin:10px 0;font-weight:600}.rb-exam-remember{border-left:3px solid var(--rb-blue);background:var(--rb-yellow);padding:14px 18px}.rb-error-label{color:var(--rb-red);font-weight:700}.rb-check{border-top:2px solid var(--rb-line);margin-top:25px;padding-top:20px}.rb-check-options{gap:8px;margin-top:12px;display:grid}.rb-feedback{min-height:3.3em;margin-top:12px}.rb-exam-practice{margin-top:24px;font-weight:600}.rb-existing>.rb-page{min-height:0;padding:16px 0}.rb-model{border:1px solid var(--rb-line);border-radius:12px;margin:24px 0;padding:18px}.rb-model>p{margin:12px 0}.rb-model-slider{flex-wrap:wrap;align-items:center;gap:10px;margin:12px 0;display:flex}.rb-model-slider input{min-width:120px;min-height:44px;accent-color:var(--rb-blue);flex:1}.rb-model svg{width:100%;height:auto}.rb-outer-shape{fill:var(--rb-yellow);stroke:var(--rb-ink);stroke-width:2px}.rb-inner-shape{fill:var(--rb-paper);stroke:var(--rb-ink);stroke-dasharray:5 3;stroke-width:2px}.rb-inner-shape.is-selected{fill:color-mix(in oklab, var(--rb-red) 25%, var(--rb-paper));stroke-width:4px}.rb-model svg text{fill:var(--rb-ink);font-size:14px}.rb-model .rb-model-caption{color:var(--rb-muted);font-size:.8rem}.rb-square-model{aspect-ratio:1;grid-template-rows:2fr 1fr;grid-template-columns:2fr 1fr;width:min(250px,100%);margin:16px 0;display:grid}.rb-square-model button{border:1px solid var(--rb-ink);background:var(--rb-yellow);color:var(--rb-ink);cursor:pointer;font-size:1.2rem}@media (width<=600px){.rb-mode-picker{grid-template-columns:1fr}.rb-exam{padding:28px 18px 45px}.rb-exam .rb-page-heading{gap:10px}.rb-exam .rb-page-heading h1{font-size:2.5rem}.rb-exam .rb-example{padding:14px 10px}.rb-exam .rb-math-expression{font-size:1.05rem}.rb-model{padding:14px 10px}}.regelboka-shell:has(.rb-exam) .rb-tabs{border-bottom:1px solid var(--rb-line);flex-wrap:wrap;gap:5px;padding:14px 18px;display:flex;position:relative;inset:auto}.regelboka-shell:has(.rb-exam) .rb-tabs a{border:1px solid var(--rb-line);min-width:36px;min-height:40px;color:var(--rb-ink);background:var(--rb-paper);border-radius:5px;justify-content:center;align-items:center;padding:6px 8px;font-size:.8rem;display:inline-flex}.regelboka-shell:has(.rb-exam) .rb-tabs a.is-active{border-color:var(--rb-blue);background:var(--rb-yellow)}.rb-exam .rb-math-expression.is-wrap .katex{white-space:normal;line-height:1.9}.rb-exam .rb-math-expression.is-wrap .katex .base{margin-block:3px}@media (width<=360px){.rb-exam{padding-inline:12px}}.rb-exam .rb-mode-picker{grid-template-columns:repeat(2,minmax(0,1fr))}.rb-exam .rb-mode-picker button{min-height:50px}.rb-exam .rb-mode-picker span{display:none}.rb-copy-entry{margin-top:20px}.rb-copy-instruction{color:var(--rb-muted);margin:0 0 12px;font-size:.9rem}.rb-copy-sheet{--note-paper:oklch(98.5% .007 90);--note-ink:oklch(25% .02 255);--note-muted:oklch(43% .02 255);--note-line:oklch(82% .01 255);border:1px solid var(--note-line);background:var(--note-paper);max-width:760px;color:var(--note-ink);font-family:var(--font-body);border-radius:8px;margin:0;padding:24px}.rb-copy-sheet h2{margin:0 0 14px;font-size:1.4rem;font-weight:700;line-height:1.25}.rb-copy-sheet .copy-note-rule{margin:0 0 12px;line-height:1.5}.rb-copy-sheet .copy-note-condition{color:var(--note-muted);margin:8px 0 12px;font-size:.9rem}.copy-note-formulas{gap:6px;margin-bottom:18px;display:grid}.rb-copy-sheet .copy-note-example h3{color:var(--note-muted);margin:0 0 6px;font-size:.9rem}.rb-copy-sheet .copy-note-example ol{gap:5px;padding:0;list-style:none;display:grid}.copy-note-example li{min-width:0}.rb-exam .rb-copy-sheet .rb-math-expression{color:var(--note-ink);font-size:1.15rem}.rb-copy-sheet .copy-note-operation{color:var(--note-muted);margin:0 0 4px;font-size:.85rem}.rb-copy-sheet .copy-note-remember{margin-top:16px;font-size:.95rem;line-height:1.5}.rb-copy-sheet .copy-note-remember strong{font-weight:700}@media (width<=600px){.rb-copy-sheet{padding:18px 14px}.rb-exam .rb-copy-sheet .rb-math-expression{font-size:1.05rem}}.rb-copy-sheet{--copy-ink-0:#126570;--copy-ink-1:#803d78}.copy-ink-0{color:var(--copy-ink-0)}.copy-ink-1{color:var(--copy-ink-1)}.copy-stage-picker{flex-wrap:wrap;gap:6px;margin:0 0 10px;display:flex}.copy-stage-picker button{border:1px solid var(--rb-line);min-height:44px;color:var(--rb-ink);background:var(--rb-paper);border-radius:6px;padding:7px 10px;font-size:.9rem}.copy-stage-picker button[aria-pressed=true]{border:2px solid var(--rb-blue);padding:6px 9px}.copy-stage-picker p{width:100%;color:var(--rb-muted);margin:2px 0;font-size:.85rem}.copy-stage-picker button:focus-visible{outline:2px solid var(--rb-blue);outline-offset:3px}.rb-copy-sheet .copy-note-example ol{margin:0}.rb-copy-sheet figure{margin:6px 0 10px}.rb-copy-sheet figcaption{color:var(--note-muted);margin-top:2px;font-size:.8rem;line-height:1.4}.copy-distribution{max-width:300px}.copy-arrow-formula{aspect-ratio:300/96;width:100%;position:relative}.copy-arrow-formula svg{width:100%;height:100%;position:absolute;inset:0}.copy-arrow-formula>span{position:absolute;top:58%;transform:translate(-50%)}.rb-exam .copy-arrow-formula .rb-math-expression{margin:0}.copy-distribution-result{justify-content:center;align-items:baseline;gap:10px;display:flex}.copy-distribution-result .rb-math-expression,.copy-arrow-formula .copy-ink-0 .rb-math-expression,.copy-arrow-formula .copy-ink-1 .rb-math-expression{color:inherit!important}.copy-area{max-width:300px}.copy-area-graphic{width:100%;color:var(--note-ink);display:block}.copy-area-graphic text{fill:currentColor;text-anchor:middle;font-size:19px;font-family:var(--font-body)}.copy-area-graphic rect{stroke:var(--note-ink);stroke-width:1.5px;fill:#0000}.copy-area-graphic .copy-cell-neutral{fill:#e4e9ed}.copy-area-graphic .copy-cell-tone-0{fill:#d9eef0}.copy-area-graphic .copy-cell-tone-1{fill:#eedfec}.copy-note-warning{border-top:1px solid var(--note-line);margin-top:14px;padding-top:8px}.copy-note-warning p{margin:4px 0 0;font-size:.85rem;line-height:1.5}.rb-copy-sheet .copy-note-example+.copy-note-example{margin-top:22px}.rb-copy-sheet .copy-note-example>p,.rb-copy-sheet .copy-note-before{margin:8px 0;line-height:1.5}.rb-copy-sheet .copy-note-example ol.math-steps{grid-template-columns:fit-content(48%) max-content minmax(0,1fr);gap:5px .25em}.copy-factor-table{border-collapse:collapse;margin-top:20px;font-size:.95rem}.copy-factor-table caption{text-align:left;margin-bottom:8px;font-weight:600}.copy-factor-table th,.copy-factor-table td{border-bottom:1px solid var(--note-line);text-align:left;padding:7px 14px 7px 0}.copy-factor-table tbody th{font-weight:400}.rb-exam .math-step .rb-math-expression.is-display{padding-block:2px}.rb-exam .rb-example ol.math-steps{grid-template-columns:fit-content(48%) max-content minmax(0,1fr);gap:6px .25em}.rb-exam .rb-mixed-text .notranslate{color:inherit}