@charset "UTF-8";
/* =====================================================================
   MeVOLT ® — staticky web

   Barvy jsou firemni ELEXIM, prevzate primo ze zdroju:
     #1D2951  hlavni modra - barva pisma v logu MeVOLT, v puvodnim
              webu nejcastejsi barva vubec (41 vyskytu)
     #0A1154  nejtmavsi modra ze znacky (ctverec s obloukem)
     #2E3192  jasnejsi modra pouzita v puvodnim webu jako akcent
   Zadna oranzova - puvodni web ji nema.

   Typografie Archivo (display) + IBM Plex Sans/Mono (text, data).
   Texty jsou prevzate doslova z puvodniho webu.
   ===================================================================== */

:root {
  /* modra rada */
  --modra:        #1D2951;   /* hlavni firemni */
  --modra-tmava:  #131C3D;   /* tmavsi odstin pro plochy */
  --modra-nejtm:  #0A1154;   /* ze znacky */
  --modra-akcent: #2E3192;   /* akcent, tlacitka */
  --modra-jasna:  #4A5BA8;   /* hover, aktivni stav */

  /* svetla rada */
  --bila:       #FFFFFF;
  --mlha:       #F5F7FA;     /* pozadi svetlych sekci */
  --linka:      #DDE3EC;
  --linka-inv:  rgba(255, 255, 255, .16);

  /* text */
  --text:       #1D2951;
  --text-tlum:  #5C6784;
  --text-inv:   #EEF1F7;
  --text-inv-tlum: #A3AECB;

  /* Faze prubehu. Osciloskopy odlisuji kanaly sytymi barvami,
     jinak se stopy slijou - proto sytejsi tony dostatecne daleko
     od sebe, ale porad chladne, aby drzely raz webu. */
  --l1: #38BDF8;   /* nebeska modra */
  --l2: #2DD4BF;   /* tyrkysova */
  --l3: #A78BFA;   /* fialova */

  --font-display: "Archivo", "Arial Narrow", Arial, sans-serif;
  --font-text:    "IBM Plex Sans", -apple-system, BlinkMacSystemFont, "Segoe UI", Arial, sans-serif;
  --font-mono:    "IBM Plex Mono", ui-monospace, SFMono-Regular, Consolas, monospace;

  --obal:    1220px;
  --sekce-y: clamp(4rem, 8vw, 7rem);
  --radius:  6px;

  /* stiny karet - jemny klid, vyrazny hover */
  --stin:       0 1px 2px rgba(29, 41, 81, .06), 0 4px 12px rgba(29, 41, 81, .05);
  --stin-hover: 0 2px 4px rgba(29, 41, 81, .08), 0 16px 32px rgba(29, 41, 81, .14);
}

*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }

body {
  margin: 0;
  background: var(--bila);
  color: var(--text);
  font-family: var(--font-text);
  font-size: clamp(1rem, .96rem + .18vw, 1.0625rem);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }
a { color: inherit; }

/* Ztizeni stazeni obrazku.
   Pozor: neni to ochrana. Obrazek, ktery prohlizec zobrazi, uz je
   u navstevnika stazeny - pres vyvojarske nastroje nebo primou adresu
   se k nemu dostane vzdy. Tohle jen odradi bezne pravé kliknuti. */
img {
  -webkit-user-select: none;
  user-select: none;
  -webkit-touch-callout: none;   /* iOS: podrzeni prstu nenabidne ulozeni */
  -webkit-user-drag: none;
}

:focus-visible { outline: 2px solid var(--modra-akcent); outline-offset: 3px; }

.symboly { position: absolute; width: 0; height: 0; overflow: hidden; }

.preskoc {
  position: absolute; left: -9999px; top: 0;
  background: var(--modra); color: var(--bila);
  padding: .75rem 1.25rem; z-index: 100;
}
.preskoc:focus { left: 0; }

.obal { width: min(100% - 2.5rem, var(--obal)); margin-inline: auto; }

/* ---------- typografie ---------- */

h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -.015em;
  margin: 0;
  text-wrap: balance;
}

.hlava { max-width: 52rem; margin-bottom: clamp(2.25rem, 3.5vw, 3.25rem); }
.hlava h2 {
  font-size: clamp(1.4rem, 1.05rem + 1.5vw, 2.1rem);
  letter-spacing: .01em;
  line-height: 1.25;
  color: var(--modra);
}
.hlava--tmava h2 { color: var(--bila); }

/* linka nad nadpisem - prechazi z plne modre do ztracena,
   stejne jako to mel puvodni web */
.hlava::before {
  content: "";
  display: block;
  width: 108px;
  height: 3px;
  margin-bottom: 1.1rem;
  background: linear-gradient(90deg, var(--modra), rgba(29, 41, 81, 0));
}
.hlava--tmava::before {
  background: linear-gradient(90deg, var(--bila), rgba(255, 255, 255, 0));
}

/* ---------- hlavicka ---------- */

.hlavicka {
  position: sticky; top: 0; z-index: 50;
  background: rgba(29, 41, 81, .94);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--linka-inv);
}
.hlavicka__rada { display: flex; align-items: center; gap: 1.5rem; min-height: 62px; }

.znacka {
  display: inline-flex; align-items: center;
  text-decoration: none;
}
.znacka__napis { width: 126px; height: auto; }
.znacka--paticka .znacka__napis { width: 104px; }

.nav { margin-left: auto; display: flex; gap: 1.75rem; font-size: .9rem; }
.nav a {
  color: var(--text-inv-tlum); text-decoration: none;
  padding: .35rem 0; border-bottom: 1px solid transparent;
  transition: color .18s, border-color .18s;
}
.nav a:hover { color: var(--bila); border-bottom-color: var(--bila); }

/* ---------- tlacitka ---------- */

.tlacitko {
  display: inline-block;
  background: var(--bila); color: var(--modra);
  font-weight: 600; font-size: .95rem; padding: .8rem 1.6rem;
  border-radius: var(--radius); text-decoration: none;
  transition: background .18s, transform .18s, box-shadow .18s;
}
.tlacitko:hover {
  background: #E8EDF7;
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(0, 0, 0, .25);
}
.tlacitko:active { transform: translateY(0); }
.tlacitko--maly { padding: .5rem 1.1rem; font-size: .875rem; }

/* na svetlem podkladu obraceny pomer */
.sekce .tlacitko { background: var(--modra); color: var(--bila); }
.sekce .tlacitko:hover { background: var(--modra-akcent); }

/* ---------- hero ---------- */

.hero {
  position: relative;
  background: linear-gradient(160deg, var(--modra) 0%, var(--modra-tmava) 100%);
  color: var(--text-inv);
  padding-top: clamp(3rem, 6vw, 5rem);
  overflow: hidden;
}
.hero::before {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(var(--linka-inv) 1px, transparent 1px),
    linear-gradient(90deg, var(--linka-inv) 1px, transparent 1px);
  background-size: 64px 64px; opacity: .35;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 30%, #000 20%, transparent 75%);
  pointer-events: none;
}

.hero__mrizka {
  position: relative; display: grid;
  grid-template-columns: 1.15fr .85fr;
  gap: clamp(2rem, 5vw, 4rem); align-items: center;
  padding-bottom: clamp(2.5rem, 5vw, 4rem);
}

.hero__nadpis {
  font-size: clamp(2.1rem, 1.3rem + 3.6vw, 4rem);
  font-weight: 800; letter-spacing: -.032em;
  color: var(--bila);
  margin-bottom: 1.1rem; max-width: 15ch;
}
.hero__perex {
  font-size: clamp(1.02rem, .98rem + .3vw, 1.2rem);
  color: var(--text-inv-tlum); max-width: 34rem; margin: 0 0 2rem;
}
.hero__akce { display: flex; align-items: center; gap: 1.75rem; flex-wrap: wrap; }

.hero__produkt { margin: 0; justify-self: center; }
.hero__produkt img {
  width: clamp(190px, 26vw, 320px);
  filter: drop-shadow(0 30px 60px rgba(0, 0, 0, .5));
}

/* ---------- signature: trojfazovy prubeh ---------- */

.prubeh {
  position: relative;
  border-top: 1px solid var(--linka-inv);
  /* tmavsi podklad pod stopami - svetlejsi cary na nem vic vyniknou */
  background: linear-gradient(180deg, rgba(10, 17, 84, .35), rgba(10, 17, 84, .55));
  overflow: hidden;
}
.prubeh svg { display: block; width: 100%; height: clamp(80px, 9vw, 120px); }
.prubeh__osy line { stroke: var(--linka-inv); stroke-width: 1; stroke-dasharray: 3 5; }

.prubeh__faze {
  fill: none; stroke-width: 2.1; stroke-linecap: round;
  vector-effect: non-scaling-stroke;
  /* jemne prosvetleni jako stopa na osciloskopu */
  filter: drop-shadow(0 0 4px currentColor);
}
.prubeh__faze--l1 { stroke: var(--l1); color: var(--l1); }
.prubeh__faze--l2 { stroke: var(--l2); color: var(--l2); }
.prubeh__faze--l3 { stroke: var(--l3); color: var(--l3); }

/* Tvar vlny pocita skript v main.js kazdy snimek z rovnice postupne
   vlny. Zadna CSS animace tu proto neni. */

.prubeh__legenda {
  position: absolute;
  right: max(1.25rem, (100vw - var(--obal)) / 2);
  bottom: .7rem;
  display: flex; gap: 1rem;
  font-family: var(--font-mono); font-size: .72rem;
  color: var(--text-inv-tlum);
}
.prubeh__legenda span { display: inline-flex; align-items: center; gap: .35rem; }
.tecka { width: 7px; height: 7px; border-radius: 50%; display: inline-block; }
.tecka--l1 { background: var(--l1); }
.tecka--l2 { background: var(--l2); }
.tecka--l3 { background: var(--l3); }
.prubeh__hz { color: var(--l2); }

/* ---------- sekce ---------- */

.sekce { padding-block: var(--sekce-y); }
.sekce--mlha { background: var(--mlha); }
.sekce--tmava {
  background: linear-gradient(160deg, var(--modra) 0%, var(--modra-tmava) 100%);
  color: var(--text-inv);
}

.uvod { max-width: 52rem; }
.uvod p { margin: 0 0 1.1rem; }
.uvod__vedouci {
  font-size: clamp(1.1rem, 1.02rem + .4vw, 1.3rem);
  color: var(--modra);
  font-weight: 500;
}
.uvod p:not(.uvod__vedouci):not(.externi-obal) { color: var(--text-tlum); }

/* uvodni sekce: text vlevo, napis znacky vpravo */
.produkt__mrizka {
  display: grid;
  grid-template-columns: 1.35fr .65fr;
  gap: clamp(2rem, 5vw, 4rem);
  align-items: center;
}
.produkt__znacka { margin: 0; justify-self: center; }
.produkt__znacka img { width: clamp(200px, 24vw, 340px); }

.externi-obal {
  display: flex; flex-wrap: wrap; align-items: center; gap: .5rem 1.25rem;
  margin-top: 1.75rem; color: var(--text-tlum);
}
.externi { display: inline-flex; gap: 1.25rem; }
.externi a {
  font-family: var(--font-mono); font-size: .85rem; letter-spacing: .04em;
  color: var(--modra); text-decoration: none;
  border-bottom: 1px solid var(--linka); padding-bottom: .15rem;
  transition: border-color .18s, color .18s;
}
.externi a:hover { border-bottom-color: var(--modra-akcent); color: var(--modra-akcent); }

/* ---------- karty: spolecne chovani ----------
   Vsechny informacni karty se pri najeti mysi zvednou a prohloubi
   stin. Je to jediny pohyb v obsahove casti stranky, takze drzi
   pozornost tam, kde uzivatel prave je. */

.karta-zaklad {
  background: var(--bila);
  border: 1px solid var(--linka);
  border-radius: var(--radius);
  box-shadow: var(--stin);
  transition: transform .22s ease, box-shadow .22s ease, border-color .22s ease;
}
.karta-zaklad:hover {
  transform: translateY(-6px);
  box-shadow: var(--stin-hover);
  border-color: #C8D2E4;
}
@media (prefers-reduced-motion: reduce) {
  .karta-zaklad { transition: box-shadow .22s ease; }
  .karta-zaklad:hover { transform: none; }
}

/* ---------- dlazdice prinosu ---------- */

.dlazdice {
  list-style: none; margin: 0; padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(268px, 1fr));
  gap: 1.25rem;
}
/* ikona uprostred nad textem, text pod ni na stred */
.dlazdice__kus {
  padding: 2rem 1.5rem 1.75rem;
  text-align: center;
}
.dlazdice__ikona {
  width: 34px; height: 34px;
  margin: 0 auto 1.25rem;
  fill: none; stroke: var(--modra-akcent);
  stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round;
  transition: stroke .22s ease, transform .22s ease;
}
.dlazdice__kus:hover .dlazdice__ikona {
  stroke: var(--modra-jasna);
  transform: scale(1.08);
}
.dlazdice__kus h3 {
  font-size: 1.05rem; margin-bottom: .6rem;
  color: var(--modra); letter-spacing: -.005em;
}
.dlazdice__kus p { margin: 0; color: var(--text-tlum); font-size: .92rem; }

@media (prefers-reduced-motion: reduce) {
  .dlazdice__kus:hover .dlazdice__ikona { transform: none; }
}

/* ---------- main feature overview ----------
   Stejne karty jako jinde na strance, jen na tmavem podkladu. */

.stitek__seznam {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}
.stitek__seznam li {
  display: flex; align-items: flex-start; gap: .85rem;
  padding: 1.5rem;
  color: var(--text-inv);
  font-size: .96rem;
  background: rgba(255, 255, 255, .05);
  border: 1px solid var(--linka-inv);
  border-top: 3px solid rgba(255, 255, 255, .22);
  border-radius: var(--radius);
  transition: transform .22s ease, background .22s ease, border-top-color .22s ease;
}
.stitek__seznam li:hover {
  transform: translateY(-6px);
  background: rgba(255, 255, 255, .09);
  border-top-color: var(--l2);
}
.stitek__seznam li::before {
  content: "";
  flex: 0 0 auto;
  width: 6px; height: 6px; margin-top: .58rem;
  border-radius: 50%; background: var(--l2);
}

/* ---------- fields of application ---------- */

.pouziti {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fit, minmax(290px, 1fr));
  gap: 1.25rem;
}
.pouziti li {
  padding: 1.5rem;
  color: var(--text-tlum);
  font-size: .94rem;
  /* v klidu svetla linka, tmavne az kdyz se karta zvedne */
  border-top: 3px solid var(--linka);
}
.pouziti li:hover { border-top-color: var(--modra); }

@media (prefers-reduced-motion: reduce) {
  .stitek__seznam li:hover { transform: none; }
}

/* ---------- dokumenty a software ---------- */

.dokumenty {
  list-style: none; margin: 0; padding: 0;
  display: grid; grid-template-columns: repeat(auto-fill, minmax(310px, 1fr));
  gap: 1.25rem;
}
.dokument {
  display: flex; flex-direction: column; gap: 1.25rem;
  padding: 1.7rem 1.6rem;
}
.dokument__text { flex: 1; }
.dokument h3 { font-size: 1.08rem; margin-bottom: .4rem; color: var(--modra); }
.dokument p { margin: 0; color: var(--text-tlum); font-size: .92rem; }

/* Tlacitko ke stazeni: ikona nahore, pod ni jazyk a udaje o souboru -
   stejne poradi, jake mel puvodni web. */
.dokument__soubory { display: flex; flex-wrap: wrap; gap: .75rem; }

.soubor {
  display: flex; flex-direction: column; align-items: center;
  min-width: 92px;
  padding: 1rem .9rem .85rem;
  border: 1px solid var(--linka); border-radius: var(--radius);
  background: var(--bila);
  text-decoration: none;
  transition: border-color .2s, background .2s, box-shadow .2s;
}
.soubor:hover {
  border-color: var(--modra-akcent);
  background: #F3F6FD;
  box-shadow: 0 4px 12px rgba(29, 41, 81, .1);
}
.soubor__ikona {
  width: 30px; height: 30px;
  fill: var(--modra-akcent);
  margin-bottom: .6rem;
  transition: fill .2s;
}
.soubor:hover .soubor__ikona { fill: var(--modra-jasna); }

.soubor__stitek {
  font-family: var(--font-display); font-weight: 700; font-size: .95rem;
  line-height: 1.1;
  color: var(--modra);
}
.soubor__meta {
  font-family: var(--font-mono); font-size: .65rem;
  color: var(--text-tlum);
  margin-top: .2rem;
  white-space: nowrap;
}

.prazdno {
  border: 1px dashed var(--linka); border-radius: var(--radius);
  padding: 2rem; color: var(--text-tlum); text-align: center;
}

/* ---------- kontakty ---------- */

.kontakty {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: clamp(1.75rem, 3vw, 3rem);
}
.kontakt h3 {
  font-size: 1rem; color: var(--l2); margin-bottom: .85rem;
  font-family: var(--font-mono); font-weight: 500;
  letter-spacing: .08em; text-transform: uppercase;
}
.kontakt address { font-style: normal; color: var(--text-inv); line-height: 1.75; }
.kontakt p { margin: 0 0 .5rem; }
.kontakt a { color: var(--text-inv); text-decoration: none; border-bottom: 1px solid var(--linka-inv); }
.kontakt a:hover { border-bottom-color: var(--bila); }
.kontakt__ic {
  font-family: var(--font-mono); font-size: .8rem;
  color: var(--text-inv-tlum); margin-top: .85rem;
}

.lide { list-style: none; margin: 1.25rem 0 0; padding: 0; }
.lide li {
  display: flex; justify-content: space-between; gap: 1rem;
  padding: .5rem 0; border-top: 1px solid var(--linka-inv); font-size: .94rem;
}
.lide span { color: var(--text-inv-tlum); }

/* ---------- navrat nahoru ----------
   Objevi se, az kdyz je co rolovat zpet. Do te doby na strance
   vubec neni, aby nezavazel. */

.nahoru {
  position: fixed;
  right: clamp(1rem, 3vw, 2rem);
  bottom: clamp(1rem, 3vw, 2rem);
  z-index: 60;

  width: 46px; height: 46px;
  display: grid; place-items: center;
  padding: 0;
  border: 1px solid var(--linka-inv);
  border-radius: 50%;
  background: var(--modra);
  color: var(--bila);
  cursor: pointer;
  box-shadow: 0 4px 14px rgba(29, 41, 81, .28);

  /* skryty stav - odsunuty dolu a pruhledny */
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .25s ease, transform .25s ease, background .18s ease;
}
.nahoru[hidden] { display: none; }
.nahoru.je-videt { opacity: 1; transform: translateY(0); }

.nahoru:hover { background: var(--modra-akcent); }
.nahoru:active { transform: translateY(2px); }

.nahoru svg {
  width: 20px; height: 20px;
  fill: none; stroke: currentColor;
  stroke-width: 2; stroke-linecap: round; stroke-linejoin: round;
}

/* popisek jen pro odecitace obrazovky */
.jen-pro-cteni {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

@media (prefers-reduced-motion: reduce) {
  .nahoru { transition: opacity .25s ease, background .18s ease; transform: none; }
  .nahoru.je-videt { transform: none; }
}

/* ---------- paticka ---------- */

.paticka {
  background: var(--modra-tmava);
  border-top: 1px solid var(--linka-inv);
  padding-block: 2rem; color: var(--text-inv-tlum);
}
.paticka__rada {
  display: flex; align-items: flex-start; justify-content: space-between;
  gap: 1.25rem; flex-wrap: wrap;
}
.paticka p { margin: 0; font-size: .85rem; }

/* pravni udaje - vpravo, zarovnane na pravou hranu */
.paticka__pravni { text-align: right; }
.paticka__pravni p + p { margin-top: .3rem; }

.paticka__copyright { color: var(--text-inv-tlum); }
.paticka__znamka {
  font-size: .78rem;
  color: rgba(163, 174, 203, .75);
}

@media (max-width: 700px) {
  .paticka__rada { flex-direction: column; align-items: flex-start; }
  .paticka__pravni { text-align: left; }
}

/* ---------- mobil ---------- */

@media (max-width: 880px) {
  .hero__mrizka { grid-template-columns: 1fr; }
  .hero__produkt { order: -1; justify-self: start; }
  .hero__produkt img { width: clamp(150px, 40vw, 220px); }
  .produkt__mrizka { grid-template-columns: 1fr; }
  .produkt__znacka { justify-self: start; margin-top: 1rem; }
}

@media (max-width: 700px) {
  .hlavicka__rada { flex-wrap: wrap; gap: .5rem 1rem; padding-block: .6rem; min-height: 0; }
  .tlacitko--maly { margin-left: auto; }
  .nav {
    order: 3; width: 100%; margin-left: 0; gap: 1.15rem; font-size: .84rem;
    overflow-x: auto; scrollbar-width: none; padding-bottom: .15rem;
  }
  .nav::-webkit-scrollbar { display: none; }
  .nav a { white-space: nowrap; }
  .prubeh__legenda { position: static; padding: .5rem 1.25rem 0; justify-content: flex-end; }
}