.calc-card{margin-top:13px;padding:15px;border:1px solid var(--border);border-radius:18px;background:var(--card);box-shadow:var(--shadow)}.mode-grid{display:grid;grid-template-columns:1fr 1fr;gap:8px}.mode{padding:11px 9px;border:1px solid var(--border);border-radius:12px;background:var(--input);color:var(--text);font:800 11px/1.25 system-ui;cursor:pointer}.mode.active{border-color:var(--blue);background:var(--soft);color:var(--blue)}.calc-section{margin-top:16px;padding-top:15px;border-top:1px solid var(--border)}.calc-section h2{margin:0 0 10px;font-size:15px}.form-grid{display:grid;gap:9px}.three-cols{grid-template-columns:1.2fr 1fr 1fr}.flow-inputs{grid-template-columns:2fr 1fr}.form-grid label{color:var(--muted);font-size:12px}.form-grid input,.form-grid select{width:100%;min-width:0;margin-top:5px;padding:11px;border:1px solid var(--border);border-radius:11px;background:var(--input);color:var(--text);font:inherit}.result-panel{margin-top:16px;padding:15px;border-radius:14px;background:var(--blue);color:#fff}.result-panel small{display:block;margin-bottom:5px;font-size:11px;font-weight:700;opacity:.82}.result-panel strong{font-size:24px}.metrics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin-top:10px}.metric{padding:11px;border-radius:12px;background:var(--soft)}.metric small,.metric span{display:block;color:var(--muted);font-size:10px}.metric strong{display:block;margin:4px 0;font-size:16px}.error{margin-top:12px;padding:10px;border-radius:11px;background:#fff0ed;color:#a52a1c;font-size:12px;font-weight:700}.hidden{display:none!important}details{margin-top:13px;padding:11px;border:1px solid var(--border);border-radius:12px}summary{font-size:13px;font-weight:700;cursor:pointer}.details-copy{color:var(--muted);font-size:12px;line-height:1.5}.details-copy a{color:var(--blue)}@media(max-width:560px){.guide-list{grid-template-columns:1fr;gap:2px}.guide-list dd{margin-bottom:7px}.mode-grid,.three-cols,.flow-inputs,.metrics-grid{grid-template-columns:1fr}.result-panel strong{font-size:21px}}

/* Unified collapsible indicator */
.method-card{padding:0 13px;border-radius:18px;background:var(--card)}
.method-card>summary{list-style:none;display:grid;grid-template-columns:1fr auto;align-items:center;padding:13px 0;cursor:pointer;color:var(--blue);font-size:14px;font-weight:800}
.method-card>summary::-webkit-details-marker{display:none}
.method-card>summary::marker{content:""}
.method-card>summary:after{content:"+";grid-column:2;color:var(--blue);font-size:22px;font-weight:600}
.method-card[open]>summary:after{content:"−"}
.method-card>.details-copy{padding:0 0 12px}
.usage-guide{border-color:color-mix(in srgb,var(--blue) 30%,var(--border))}
.guide-list{display:grid;grid-template-columns:minmax(150px,.7fr) minmax(0,2fr);gap:7px 14px;margin:8px 0 0}.guide-list dt{color:var(--text);font-weight:750}.guide-list dd{margin:0}
html[lang="it"] .guide-en,html[lang="en"] .guide-it{display:none}
@media(max-width:560px){.guide-list{grid-template-columns:1fr;gap:2px}.guide-list dd{margin-bottom:7px}}

.scale-controls{grid-template-columns:1fr 1fr}.flowmeter-scale-preview{overflow-x:auto;padding:12px 0;background:white;border-radius:12px}.flowmeter-scale-preview:empty{display:none}.flowmeter-scale-svg{display:block;margin:0 auto;max-width:100%;height:auto;color:#172033}
@media(max-width:560px){.scale-controls{grid-template-columns:1fr}}
@media print{.mygasapp-print-section#verticalScaleSection{break-inside:auto}.scale-controls,#verticalScaleStatus{display:none!important}.flowmeter-scale-preview{overflow:visible!important;padding:0!important;break-inside:avoid!important}.flowmeter-scale-svg{width:90mm!important;min-width:90mm!important;max-width:none!important;height:var(--scale-height)!important;break-inside:avoid!important}}