/* Roman numeral converter (#70) */
.container--roman-tool{width:min(100% - 1.5rem,72rem)}
.roman-tool-intro{max-width:58rem}
.roman-app{display:grid;gap:1rem;margin:1.5rem 0 2rem}
.roman-mode-switch{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.4rem;padding:.4rem;border:1px solid var(--color-border);border-radius:var(--radius-lg);background:var(--color-surface-soft)}
.roman-mode-button{min-width:0;min-height:48px;padding:.75rem;border:1px solid transparent;border-radius:calc(var(--radius-lg) - 6px);background:transparent;color:var(--color-muted);font:inherit;font-weight:800;cursor:pointer;overflow-wrap:anywhere}
.roman-mode-button[aria-pressed="true"]{border-color:rgba(20,107,99,.32);background:var(--color-surface);color:var(--color-primary);box-shadow:var(--shadow-sm)}
.roman-mode-button:focus-visible,.roman-examples button:focus-visible{outline:3px solid rgba(20,107,99,.34);outline-offset:2px}
.roman-workspace{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,.9fr);gap:1rem;align-items:start}
.roman-input-panel,.roman-result-panel{min-width:0;margin:0;padding:clamp(1rem,2.7vw,1.5rem)}
.roman-panel-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:1rem;margin-bottom:1rem}
.roman-panel-heading h2,.roman-result-panel h2{margin:0}
.roman-panel-heading p{margin:.2rem 0 0;color:var(--color-muted);font-size:.9rem}
.roman-input-label{display:grid;gap:.45rem;color:var(--color-text);font-weight:800}
.roman-input-label input{box-sizing:border-box;width:100%;min-width:0;min-height:56px;padding:.8rem .9rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface);color:var(--color-text);font:inherit;font-size:1.08rem}
.roman-input-label input:focus{border-color:var(--color-primary);outline:3px solid rgba(20,107,99,.18)}
.roman-error{min-height:1.5em;margin:.55rem 0;color:var(--color-danger);font-weight:750}
.roman-examples{margin-top:1rem}
.roman-examples h3{margin:0 0 .45rem;color:var(--color-muted);font-size:.85rem}
.roman-examples>div{display:flex;flex-wrap:wrap;gap:.45rem}
.roman-examples button{min-height:40px;padding:.48rem .7rem;border:1px solid var(--color-border);border-radius:999px;background:var(--color-surface);color:var(--color-primary);font:inherit;font-weight:750;cursor:pointer}
.roman-examples button:hover{border-color:var(--color-primary-light);background:var(--color-surface-soft)}
.roman-result-panel{position:sticky;top:5.5rem}
.roman-result-card{display:grid;min-width:0;gap:.65rem;margin-top:1rem;padding:clamp(1.2rem,4vw,2rem);border:1px solid rgba(20,107,99,.25);border-radius:var(--radius-lg);background:linear-gradient(145deg,rgba(20,107,99,.09),rgba(255,255,255,.88));text-align:center}
.roman-result-card output{display:block;max-width:100%;color:var(--color-primary);font-family:Georgia,"Times New Roman",serif;font-size:clamp(2.1rem,8vw,4rem);font-weight:800;line-height:1.15;letter-spacing:.045em;overflow-wrap:anywhere;word-break:break-word}
.roman-result-card p{margin:0;color:var(--color-text);font-weight:800;overflow-wrap:anywhere}
.roman-copy-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:.65rem;margin-top:.8rem}
.roman-copy-actions .button{min-width:0;width:100%}
.roman-copy-actions .button:disabled{cursor:not-allowed;opacity:.5}
.roman-breakdown{margin-top:.9rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface-soft)}
.roman-breakdown summary{padding:.8rem .9rem;font-weight:800;cursor:pointer}
.roman-breakdown ol{display:grid;gap:.35rem;margin:0;padding:0 .9rem .9rem 2.2rem}
.roman-breakdown li{overflow-wrap:anywhere}
.roman-status{min-height:1.5em;margin:.7rem 0 0;color:var(--color-primary);font-weight:750}
.roman-reference-grid{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));gap:.55rem;margin:1rem 0 1.5rem}
.roman-reference-grid span{display:grid;min-width:0;gap:.25rem;padding:.75rem .35rem;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-surface-soft);text-align:center}
.roman-reference-grid strong{color:var(--color-primary);font-family:Georgia,"Times New Roman",serif;font-size:1.35rem}
.roman-reference-grid small{color:var(--color-muted);font-weight:750}
.roman-reference-grid--subtract{grid-template-columns:repeat(6,minmax(0,1fr))}
.roman-faq{margin-top:1rem}
@media(max-width:760px){.roman-workspace{grid-template-columns:1fr}.roman-result-panel{position:static}.roman-reference-grid{grid-template-columns:repeat(4,minmax(0,1fr))}.roman-reference-grid--subtract{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:420px){.container--roman-tool{width:min(100% - 1rem,72rem);max-width:100%}.roman-mode-switch{grid-template-columns:1fr}.roman-input-panel,.roman-result-panel{width:100%;max-width:100%;min-width:0;padding:.85rem}.roman-panel-heading{align-items:stretch;flex-direction:column}.roman-panel-heading .button{width:100%}.roman-copy-actions{grid-template-columns:1fr}.roman-reference-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.roman-reference-grid--subtract{grid-template-columns:repeat(2,minmax(0,1fr))}.roman-result-card{padding:1rem}.roman-result-card output{font-size:clamp(1.8rem,12vw,2.5rem)}.roman-examples button{max-width:100%}}