/*
 * Lynt Calc – výchozí vzhled. Web ho ladí vlastním CSS – souborem v šabloně (<šablona webu>/lynt-calc/calc.css), nebo
 * vzhledem dodaným s pluginem pro šablonu webu (assets/css/sites/<šablona>.css) – nejsnáz přepsáním proměnných
 * --lc-* (rozhraní) a --sch-* (schémata) na .lc, případně vlastními pravidly pro třídy lc-*.
 */

.lc {
	--lc-accent: #2563eb;
	--lc-accent-ink: #fff;
	--lc-ink: #111827;
	--lc-muted: #6b7280;
	--lc-line: #e5e7eb;
	--lc-field: #cbd5e1;
	--lc-bg: #fff;
	--lc-soft: #f8fafc;
	--lc-radius: 12px;
	--lc-radius-box: 10px;   /* výsledky, schéma, postup */
	--lc-radius-field: 8px;  /* pole, tlačítka, hlášky */
	--lc-radius-pill: 999px; /* předvolby a volby */
	--lc-font: inherit;
	--lc-math: "Cambria Math", "STIX Two Math", Cambria, Georgia, serif;
	--lc-error: #b91c1c;
	--lc-error-bg: #fef2f2;
	--lc-warn: #92400e;
	--lc-warn-bg: #fffbeb;
	--lc-info: #1e40af;
	--lc-info-bg: #eff6ff;
	--lc-ok: #15803d;
	--lc-ok-bg: #f0fdf4;

	color: var(--lc-ink);
	font-family: var(--lc-font);
	line-height: 1.45;
	background: var(--lc-bg);
	border: 1px solid var(--lc-line);
	border-radius: var(--lc-radius);
	padding: clamp(14px, 3vw, 24px);
	margin: 1.5em 0;
}

/* schémata (vzor: circuitcanvas.com) – kalkulačky i blok Schéma */
.lc,
.lc-schema {
	--sch-stroke: #1f2937;
	--sch-stroke-width: 1.6;
	--sch-block: #fcd77f;
	--sch-block-stroke: #a8841f;
	--sch-label: #6b7280;
	--sch-value: #374151;
	--sch-font: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
	--sch-grid: #d6dae1;
	--sch-hl: #2563eb;
	--sch-current: #dc2626;
	--sch-voltage: #2563eb;
	--sch-led-red: #ef4444;
	--sch-led-yellow: #facc15;
	--sch-led-green: #22c55e;
	--sch-led-blue: #3b82f6;
	--sch-led-white: #f8fafc;
}

[x-cloak] { display: none !important; }
.lc *, .lc *::before, .lc *::after { box-sizing: border-box; }
.lc-noscript { padding: 12px 14px; border: 1px dashed var(--lc-line, #e5e7eb); border-radius: 10px; color: #6b7280; }

/* přepínač kalkulačka / procvičování */
.lc-tabs { display: flex; gap: 4px; margin: -6px 0 18px; border-bottom: 1px solid var(--lc-line); }
.lc-tabs button {
	appearance: none; background: none; border: 0; border-bottom: 2px solid transparent; margin-bottom: -1px;
	padding: 8px 12px; font: inherit; font-weight: 600; color: var(--lc-muted); cursor: pointer;
}
.lc-tabs button[aria-selected="true"] { color: var(--lc-accent); border-bottom-color: var(--lc-accent); }

/* rozložení */
.lc-layout { display: grid; grid-template-columns: minmax(240px, 1fr) minmax(0, 1.5fr); gap: clamp(16px, 3vw, 28px); }
@media (max-width: 780px) { .lc-layout { grid-template-columns: 1fr; } }
/* .lc .lc-heading: šablony dávají nadpisům v obsahu vlastní velikost (např. .entry-content h3) */
.lc .lc-heading { font-size: .78em; font-weight: 700; text-transform: uppercase; letter-spacing: .06em; color: var(--lc-muted); margin: 0 0 12px; }
.lc-row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.lc-tip { font-size: .9em; color: var(--lc-muted); margin: -4px 0 14px; }

/* pole */
.lc-field { margin: 0 0 14px; }
/* popisky jsou <label> – šablony jim dávají vlastní barvu a okraje (např. Bricks) */
.lc-field__label { display: block; font-weight: 600; font-size: .92em; margin-bottom: 5px; color: inherit; }
.lc-field__control { display: flex; gap: 6px; }
.lc-input, .lc-select, .lc-share__code {
	width: 100%; min-width: 0; font: inherit; color: var(--lc-ink); background: #fff;
	padding: 8px 10px; border: 1px solid var(--lc-field); border-radius: var(--lc-radius-field);
}
.lc-input { font-variant-numeric: tabular-nums; }
.lc-input:focus, .lc-select:focus, .lc-share__code:focus { outline: 2px solid var(--lc-accent); outline-offset: 1px; border-color: var(--lc-accent); }
.lc-field.is-invalid .lc-input { border-color: var(--lc-error); background: var(--lc-error-bg); }
.lc-field.is-computed .lc-input { background: var(--lc-soft); color: var(--lc-accent); font-weight: 600; }
.lc-field__msg { color: var(--lc-error); font-size: .85em; margin: 4px 0 0; }
.lc-field__hint { color: var(--lc-muted); font-size: .82em; margin: 4px 0 0; }
.lc-check { display: flex; gap: 8px; align-items: center; margin: 0; font-weight: 600; font-size: .92em; color: inherit; cursor: pointer; }

/* tlačítka, předvolby, volby */
.lc-presets, .lc-choices { display: flex; flex-wrap: wrap; gap: 6px; margin-top: 6px; }
.lc-preset, .lc-choice, .lc-btn, .lc-stepbtn {
	appearance: none; font: inherit; font-size: .86em; line-height: 1.3; color: var(--lc-ink); background: #fff;
	border: 1px solid var(--lc-field); border-radius: var(--lc-radius-pill); padding: 4px 11px; cursor: pointer;
}
.lc-preset:hover, .lc-choice:hover, .lc-btn:hover, .lc-stepbtn:hover { border-color: var(--lc-accent); }
.lc-preset.is-on, .lc-choice.is-on { border-color: var(--lc-accent); background: var(--lc-info-bg); color: var(--lc-accent); font-weight: 600; }
.lc-stepbtn { border-radius: var(--lc-radius-field); padding: 0 13px; font-size: 1.1em; }
.lc-btn { border-radius: var(--lc-radius-field); padding: 7px 14px; }
.lc-btn:disabled { opacity: .45; cursor: default; }
.lc-btn--primary { background: var(--lc-accent); border-color: var(--lc-accent); color: var(--lc-accent-ink); font-weight: 600; }
.lc-choice { display: inline-flex; align-items: center; gap: 6px; }
.lc-choice__swatch { width: 12px; height: 12px; border-radius: 50%; background: var(--lc-swatch, #94a3b8); border: 1px solid rgba(0, 0, 0, .25); }
.lc-choice--red { --lc-swatch: var(--sch-led-red); }
.lc-choice--yellow { --lc-swatch: var(--sch-led-yellow); }
.lc-choice--green { --lc-swatch: var(--sch-led-green); }
.lc-choice--blue { --lc-swatch: var(--sch-led-blue); }
.lc-choice--white { --lc-swatch: var(--sch-led-white); }

/* výsledky */
.lc-results { display: grid; grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; margin: 0 0 16px; }
.lc-result { background: var(--lc-soft); border: 1px solid var(--lc-line); border-radius: var(--lc-radius-box); padding: 9px 12px; }
.lc-result__label { display: block; font-size: .8em; color: var(--lc-muted); }
.lc-result__value { display: block; font-size: 1.12em; font-weight: 700; font-variant-numeric: tabular-nums; }
.lc-result--primary { grid-column: 1 / -1; background: var(--lc-accent); border-color: var(--lc-accent); color: var(--lc-accent-ink); }
.lc-result--primary .lc-result__label { color: inherit; opacity: .85; }
.lc-result--primary .lc-result__value { font-size: 1.9em; line-height: 1.15; }

/* hlášky */
.lc-msg { border-radius: var(--lc-radius-field); padding: 8px 12px; margin: 0 0 10px; font-size: .92em; }
.lc-msg--error { background: var(--lc-error-bg); color: var(--lc-error); }
.lc-msg--warning { background: var(--lc-warn-bg); color: var(--lc-warn); }
.lc-msg--info { background: var(--lc-info-bg); color: var(--lc-info); }

/* schéma */
.lc-schematic { margin: 0 0 16px; padding: 6px; border: 1px solid var(--lc-line); border-radius: var(--lc-radius-box); background: #fff; }
.lc-schematic__svg svg { display: block; margin: 0 auto; max-width: 100%; height: auto; }

/* postup výpočtu */
.lc-steps { border: 1px solid var(--lc-line); border-radius: var(--lc-radius-box); padding: 10px 14px; }
.lc-steps summary { cursor: pointer; font-weight: 600; }
.lc-steps__list { margin: 12px 0 0; padding-left: 1.4em; }
.lc-stepitem { margin: 0 0 12px; }
.lc-stepitem__title { display: block; font-size: .86em; color: var(--lc-muted); }
.lc-stepitem__math { display: block; }
.lc-stepitem__formula, .lc-stepitem__subst { display: block; font-family: var(--lc-math); font-size: 1.08em; }
.lc-stepitem var { font-style: italic; }
.lc-stepitem--note .lc-stepitem__title { color: var(--lc-ink); }

/* procvičování */
.lc-practice__intro { color: var(--lc-muted); margin: 0 0 6px; }
.lc-practice__task { font-size: 1.06em; font-weight: 600; margin: 0 0 14px; }
.lc-practice__answer { max-width: 360px; }
.lc-practice__answer.is-ok .lc-input { border-color: var(--lc-ok); background: var(--lc-ok-bg); }
.lc-practice__answer.is-ok .lc-field__msg { color: var(--lc-ok); }
.lc-practice__actions { display: flex; flex-wrap: wrap; gap: 8px; margin: 12px 0; }
.lc-practice__score { color: var(--lc-muted); font-size: .9em; }
.lc-practice__solution { margin: 6px 0 0; }

/* sdílení */
.lc-share { display: flex; flex-wrap: wrap; gap: 8px 22px; margin-top: 18px; padding-top: 12px; border-top: 1px solid var(--lc-line); font-size: .9em; }
.lc-share__box { flex: 1 1 260px; }
.lc-share__box summary { cursor: pointer; color: var(--lc-accent); font-weight: 600; }
.lc-share__hint { color: var(--lc-muted); margin: 6px 0; }
.lc-share__row { display: flex; gap: 6px; }
.lc-share__code { font-family: ui-monospace, SFMono-Regular, Consolas, monospace; font-size: .8em; resize: vertical; }

/* SVG schémata – třídy z knihovny schémat */
.sch { font-family: var(--sch-font); }
.sch-wire, .sch-lead, .sch-body { fill: none; stroke: var(--sch-stroke); stroke-width: var(--sch-stroke-width); stroke-linecap: round; stroke-linejoin: round; }
.sch-thick { stroke-width: 3.6; }
.sch-bar { stroke-width: 2.6; }
.sch-diode { fill: none; }
.sch-meter, .sch-face { fill: #fff; }
.sch-fill { fill: var(--sch-stroke); }
.sch-arrow { fill: var(--sch-stroke); stroke: none; }
.sch-block { fill: var(--sch-block); stroke: var(--sch-block-stroke); stroke-width: 1.2; }
.sch-led { stroke: var(--sch-stroke); stroke-width: var(--sch-stroke-width); stroke-linejoin: round; fill: var(--sch-led-red); }
.sch-led--yellow { fill: var(--sch-led-yellow); }
.sch-led--green { fill: var(--sch-led-green); }
.sch-led--blue { fill: var(--sch-led-blue); }
.sch-led--white { fill: var(--sch-led-white); }
.sch-node { fill: var(--sch-stroke); }
.sch-grid-dot { fill: var(--sch-grid); }
.sch-text { font-size: 11px; fill: var(--sch-label); }
.sch-value { fill: var(--sch-value); font-weight: 600; }
.sch-sym, .sch-pol { font-size: 12px; font-weight: 700; fill: var(--sch-stroke); }
.sch-block-text { font-weight: 600; fill: #3f3a1f; }
.sch-net, .sch-label { font-weight: 600; fill: var(--sch-value); }
.sch-sub { font-size: 8px; }
.sch-pin { font-size: 9px; font-weight: 600; }
.sch-note { stroke: none; }
.sch-note--current { fill: var(--sch-current); }
.sch-note--voltage { fill: var(--sch-voltage); }
.sch-note-line { fill: none; stroke: var(--sch-voltage); stroke-width: 1.3; }
.sch-note-text--current { fill: var(--sch-current); font-weight: 600; }
.sch-note-text--voltage { fill: var(--sch-voltage); font-weight: 600; }
.sch-part.is-hl .sch-body, .sch-part.is-hl .sch-lead { stroke: var(--sch-hl); stroke-width: 2.4; }
.sch-part.is-hl .sch-bar { stroke-width: 2.8; }
.sch-part.is-hl .sch-thick { stroke-width: 3.8; }
.sch-part.is-hl .sch-led { stroke: var(--sch-hl); }
.sch-part.is-hl .sch-arrow, .sch-part.is-hl .sch-fill { fill: var(--sch-hl); }
.sch-text.is-hl { fill: var(--sch-hl); }

/* vložená verze (iframe) */
.lc-embed { margin: 0; padding: 8px; background: transparent; font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif; }
.lc-embed .lc { margin: 0; }
.lc-attrib { margin: 8px 2px 0; font-size: .85em; text-align: right; }
.lc-attrib a { color: #6b7280; }

/* stránka schématických značek ([lynt_calc_symbols]) */
.lc-symbols__license { margin: 0 0 1em; font-size: .9em; }
.lc-symbols__title { margin: 1.6em 0 .7em; }
.lc-symbols__grid { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 14px; }
.lc-symbol { margin: 0; scroll-margin-top: 90px; }
.lc-symbol__figure { display: flex; flex-direction: column; height: 100%; margin: 0; border: 1px solid #e5e7eb; border-radius: 12px; background: #fff; color: #111827; overflow: hidden; }
/* značky mají průhledné pozadí a tmavé čáry – bílý podklad i na tmavém webu; všechny ve stejném měřítku */
.lc-symbol__art { display: flex; align-items: center; justify-content: center; min-height: 160px; padding: 8px; background: #fff; border-bottom: 1px solid #f1f5f9; }
.lc-symbol__img { display: block; max-width: 100%; height: auto; }
/* popisky jsou <figcaption> – šablony je mívají menší, šedé a na střed (např. Bricks) */
.lc-symbol__caption { display: flex; flex: 1; flex-direction: column; gap: 4px; margin: 0; padding: 12px 14px 14px; font-size: inherit; color: inherit; text-align: left; }
.lc-symbol__name { font-weight: 700; }
.lc-symbol__desc { font-size: .9em; line-height: 1.45; color: #4b5563; }
.lc-symbol__download { margin-top: auto; padding-top: 6px; font-size: .85em; font-weight: 600; }
.lc-symbol:target .lc-symbol__figure { border-color: #2563eb; box-shadow: 0 0 0 3px rgba(37, 99, 235, .15); }

/* blok Schéma (lynt-calc/schema) */
.lc-schema { margin: 1.5em 0; text-align: center; }
.lc-schema__svg svg { display: block; max-width: 100%; height: auto; margin: 0 auto; }
.lc-schema__caption { margin: .4em 0 0; font-size: .9em; color: #6b7280; }
.lc-schema__error { margin: .6em 0 0; padding: 8px 12px; border-left: 3px solid #b91c1c; background: #fef2f2; color: #b91c1c; font-size: .9em; text-align: left; }
.lc-schema--editor { text-align: left; }
.lc-schema--editor .lc-schema__svg { margin-bottom: 8px; }
.lc-schema__code textarea { font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace; font-size: 13px; line-height: 1.5; }