/* Fraction calculator (#63) */
.container--fraction{width:min(100% - 1.5rem,74rem)}
.fraction-intro{max-width:58rem}
.fraction-mode-tabs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.35rem;margin:1.15rem 0;padding:.35rem;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface-muted)}
.fraction-mode-tab{min-width:0;min-height:3rem;padding:.7rem .8rem;border:0;border-radius:calc(var(--radius-md) - .2rem);background:transparent;color:var(--color-muted);font:inherit;font-weight:800;cursor:pointer}
.fraction-mode-tab[aria-selected="true"]{background:var(--color-surface);color:var(--color-primary);box-shadow:var(--shadow-soft)}
.fraction-mode-tab:focus-visible{outline:3px solid rgba(20,107,99,.28);outline-offset:2px}
.fraction-mode-panel[hidden],.fraction-conversion-input[hidden],.fraction-results[hidden],.fraction-process[hidden],.fraction-result-details>div[hidden]{display:none}
.fraction-form{display:grid;gap:1.1rem}
.fraction-input-panel,.fraction-result-panel{min-width:0;padding:clamp(1rem,2.6vw,1.5rem)}
.fraction-panel-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:1rem}
.fraction-panel-heading h2{margin:0 0 .2rem;font-size:clamp(1.15rem,2.2vw,1.4rem)}
.fraction-panel-heading p{margin:0;color:var(--color-muted);font-size:.9rem}
.fraction-calculation-row{display:grid;grid-template-columns:minmax(0,1fr) 8.2rem minmax(0,1fr);align-items:center;gap:.85rem}
.fraction-entry{min-width:0;margin:0;padding:.85rem;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface-muted)}
.fraction-entry legend{padding:0 .35rem;color:var(--color-text);font-weight:800}
.fraction-entry__value{display:grid;grid-template-columns:minmax(4.5rem,.75fr) minmax(5.5rem,1fr);align-items:center;gap:.65rem;min-width:0}
.fraction-entry label,.fraction-conversion-input>label{display:grid;gap:.3rem;min-width:0;color:var(--color-muted);font-size:.82rem;font-weight:700}
.fraction-entry input,.fraction-conversion-input input,.fraction-operator select,.fraction-conversion-type select,.fraction-precision select{width:100%;min-width:0;min-height:2.8rem;padding:.62rem .7rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);font:inherit}
.fraction-entry input:focus,.fraction-conversion-input input:focus,.fraction-operator select:focus,.fraction-conversion-type select:focus,.fraction-precision select:focus{border-color:var(--color-primary);outline:3px solid rgba(20,107,99,.18)}
.fraction-entry__whole input{text-align:center}
.fraction-entry__number{display:grid;min-width:0}
.fraction-entry__number label:first-child{padding-bottom:.45rem;border-bottom:2px solid var(--color-text)}
.fraction-entry__number label:last-child{padding-top:.45rem}
.fraction-entry__number input{text-align:center}
.fraction-operator{display:grid;gap:.35rem;min-width:0;color:var(--color-muted);font-size:.82rem;font-weight:800;text-align:center}
.fraction-operator select{font-size:1rem;font-weight:800;text-align:center}
.fraction-input-help{margin:.85rem 0 0;color:var(--color-muted);font-size:.86rem;line-height:1.65}
.fraction-error{min-height:1.5rem;margin:.65rem 0 0;color:var(--color-danger);font-weight:700}
.fraction-primary-actions{display:flex;flex-wrap:wrap;gap:.65rem;margin-top:.3rem}
.fraction-primary-actions .button{flex:1 1 11rem}
.fraction-result-panel{align-self:start}
.fraction-placeholder{margin:0;padding:1.2rem;border:1px dashed var(--color-border);border-radius:var(--radius-md);color:var(--color-muted);text-align:center}
.fraction-primary-result{display:grid;justify-items:center;gap:.55rem;padding:1.1rem;border:1px solid rgba(20,107,99,.2);border-radius:var(--radius-md);background:linear-gradient(145deg,rgba(20,107,99,.08),rgba(255,255,255,.85));text-align:center}
.fraction-primary-result h3{margin:0;color:var(--color-muted);font-size:.9rem}
.fraction-primary-result code{max-width:100%;font-size:1rem;overflow-wrap:anywhere}
.fraction-visual-stage{display:grid;min-height:5.8rem;max-width:100%;place-items:center}
.fraction-visual{display:inline-flex;max-width:100%;align-items:center;justify-content:center;color:var(--color-primary);font-size:clamp(1.8rem,6vw,2.7rem);font-weight:900;line-height:1.05}
.fraction-visual__content{display:inline-grid;grid-template-rows:auto auto;max-width:100%;text-align:center}
.fraction-visual__numerator{padding:0 .35rem .24rem;border-bottom:3px solid currentColor;overflow-wrap:anywhere}
.fraction-visual__denominator{padding:.24rem .35rem 0;overflow-wrap:anywhere}
.fraction-visual__content--integer{display:block;overflow-wrap:anywhere}
.fraction-result-details{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem;margin:1rem 0 0}
.fraction-result-details>div{min-width:0;padding:.75rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface-muted)}
.fraction-result-details dt{color:var(--color-muted);font-size:.8rem;font-weight:700}
.fraction-result-details dd{margin:.2rem 0 0;font-size:1.05rem;font-weight:800;overflow-wrap:anywhere}
.fraction-result-details dd small{display:block;margin-top:.2rem;color:var(--color-muted);font-size:.74rem;font-weight:600}
.fraction-precision,.fraction-conversion-type{display:grid;grid-template-columns:minmax(0,1fr) minmax(8rem,12rem);align-items:center;gap:.7rem;margin-top:.85rem;color:var(--color-text);font-weight:800}
.fraction-process{margin-top:.85rem;padding:.75rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface-muted)}
.fraction-process summary{cursor:pointer;font-weight:800}
.fraction-process ol{display:grid;gap:.4rem;margin:.7rem 0 0;padding-left:1.5rem}
.fraction-process li{overflow-wrap:anywhere}
.fraction-status{min-height:1.4rem;margin:.7rem 0 0}
.fraction-conversion-input{display:grid;place-items:center;margin-top:1rem}
.fraction-entry--single{width:min(100%,23rem)}
.fraction-conversion-input>label{width:min(100%,26rem)}
.fraction-definition-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:.85rem;margin:1rem 0 1.4rem}
.fraction-definition-grid section{min-width:0;padding:1rem;border:1px solid var(--color-border);border-radius:var(--radius-md);background:var(--color-surface-muted)}
.fraction-definition-grid h3{margin:0 0 .4rem;font-size:1rem}
.fraction-definition-grid p{margin:0}
.fraction-faq-list{margin-top:1rem}
@media(min-width:64rem){.fraction-form{grid-template-columns:minmax(0,1.25fr) minmax(20rem,.75fr)}.fraction-result-panel{position:sticky;top:5.5rem}}
@media(max-width:760px){.fraction-calculation-row{grid-template-columns:1fr}.fraction-operator{width:min(100%,16rem);justify-self:center}.fraction-definition-grid{grid-template-columns:1fr}.fraction-result-panel{position:static}}
@media(max-width:420px){.container--fraction{width:min(100% - 1rem,74rem)}.fraction-mode-tabs{grid-template-columns:1fr}.fraction-input-panel,.fraction-result-panel{padding:.9rem}.fraction-panel-heading{align-items:stretch;flex-direction:column}.fraction-panel-heading .button{width:100%}.fraction-entry{padding:.7rem}.fraction-entry__value{grid-template-columns:minmax(3.8rem,.7fr) minmax(4.8rem,1fr);gap:.45rem}.fraction-entry input{padding:.55rem .4rem}.fraction-primary-actions{display:grid;grid-template-columns:1fr}.fraction-result-details{grid-template-columns:1fr}.fraction-precision,.fraction-conversion-type{grid-template-columns:1fr}.fraction-visual{font-size:clamp(1.6rem,11vw,2.2rem)}.fraction-process{padding:.65rem}.fraction-process ol{padding-left:1.25rem}}