/* Systero CZ, s.r.o. – prezentace firmy. Paleta: Černá #0B0D10, Havaj #0B66D1, Hlubina #083B8C, Oranž #FF7A1A. */
:root {
  --cerna: #0B0D10;
  --povrch: #11151B;
  --povrch-2: #171C24;
  --linka: rgba(255, 255, 255, 0.08);
  --linka-silna: rgba(255, 255, 255, 0.16);
  --text: #E8ECF2;
  --text-tlum: #9AA3B2;
  --modra: #0B66D1;
  --modra-svetla: #3D8BFF;
  --hlubina: #083B8C;
  --oranz: #FF7A1A;
  --obal: 1180px;
  --radius: 16px;
  --pismo: "Manrope", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, "Cascadia Mono", "Consolas", "JetBrains Mono", monospace;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  font-family: var(--pismo);
  font-size: 17px;
  line-height: 1.6;
  color: var(--text);
  background: var(--cerna);
  overflow-x: hidden;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--modra-svetla); text-decoration: none; }
a:hover { color: #fff; }
h1, h2, h3 { margin: 0 0 0.5em; line-height: 1.12; letter-spacing: -0.02em; font-weight: 800; }
h1 { font-size: clamp(2.3rem, 5.2vw, 4.1rem); }
h2 { font-size: clamp(1.7rem, 3.4vw, 2.6rem); }
h3 { font-size: 1.25rem; letter-spacing: -0.01em; }
p { margin: 0 0 1em; }
.obal { width: min(var(--obal), 100% - 32px); margin-inline: auto; }
:focus-visible { outline: 2px solid var(--oranz); outline-offset: 3px; }

/* pozadí: mřížka + záře */
.pozadi { position: fixed; inset: 0; z-index: -1; overflow: hidden; pointer-events: none; }
.pozadi__mrizka {
  position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.045) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 100%);
  -webkit-mask-image: radial-gradient(ellipse 80% 60% at 50% 0%, #000 30%, transparent 100%);
}
.pozadi__zare { position: absolute; border-radius: 50%; filter: blur(90px); opacity: 0.55; }
.pozadi__zare--modra { width: 720px; height: 720px; left: -200px; top: -240px; background: radial-gradient(circle, rgba(11,102,209,0.55), transparent 65%); }
.pozadi__zare--oranz { width: 520px; height: 520px; right: -160px; top: 220px; background: radial-gradient(circle, rgba(255,122,26,0.28), transparent 65%); }

/* hlavička */
.hlavicka { position: sticky; top: 0; z-index: 50; backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px); background: rgba(11,13,16,0.72); border-bottom: 1px solid transparent; transition: border-color .2s, background .2s; }
.hlavicka--stin { border-bottom-color: var(--linka); background: rgba(11,13,16,0.88); }
.hlavicka__radek { display: flex; align-items: center; justify-content: space-between; height: 72px; gap: 24px; }
.logo { display: inline-flex; align-items: center; gap: 12px; color: #fff; }
.logo__symbol { flex: none; }
.logo__slovo { font-weight: 800; letter-spacing: 0.14em; font-size: 1.05rem; }
.menu { display: flex; align-items: center; gap: 28px; font-weight: 600; font-size: 0.95rem; }
.menu a { color: var(--text-tlum); }
.menu a:hover { color: #fff; }
.menu__cta { color: #fff !important; padding: 9px 18px; border: 1px solid var(--linka-silna); border-radius: 999px; transition: border-color .2s, background .2s; }
.menu__cta:hover { border-color: var(--modra-svetla); background: rgba(11,102,209,0.18); }
.menu-tl { display: none; width: 44px; height: 44px; border: 1px solid var(--linka-silna); border-radius: 10px; background: transparent; cursor: pointer; padding: 0; flex-direction: column; align-items: center; justify-content: center; gap: 5px; }
.menu-tl span { display: block; width: 20px; height: 2px; background: #fff; border-radius: 2px; transition: transform .2s, opacity .2s; }
.menu-tl--otevreno span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-tl--otevreno span:nth-child(2) { opacity: 0; }
.menu-tl--otevreno span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
.menu-mobil { display: none; flex-direction: column; border-top: 1px solid var(--linka); background: rgba(11,13,16,0.96); }
.menu-mobil a { padding: 16px; border-bottom: 1px solid var(--linka); color: #fff; font-weight: 600; }
.menu-mobil:not([hidden]) { display: flex; }

/* štítky, tlačítka */
.stitek { display: inline-flex; align-items: center; gap: 10px; font-family: var(--mono); font-size: 0.78rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-tlum); margin-bottom: 18px; }
.stitek__tecka { width: 8px; height: 8px; border-radius: 50%; background: var(--oranz); box-shadow: 0 0 0 4px rgba(255,122,26,0.18); }
.tl { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 14px 26px; border-radius: 12px; font-weight: 700; font-size: 1rem; transition: transform .15s, box-shadow .2s, background .2s, border-color .2s; }
.tl:active { transform: translateY(1px); }
.tl--hlavni { background: linear-gradient(135deg, var(--modra-svetla), var(--modra) 55%, var(--hlubina)); color: #fff; box-shadow: 0 10px 30px rgba(11,102,209,0.35), inset 0 1px 0 rgba(255,255,255,0.18); }
.tl--hlavni:hover { color: #fff; box-shadow: 0 14px 40px rgba(11,102,209,0.5), inset 0 1px 0 rgba(255,255,255,0.25); }
.tl--vedlejsi { color: #fff; border: 1px solid var(--linka-silna); background: rgba(255,255,255,0.03); }
.tl--vedlejsi:hover { border-color: #fff; }
.zvyraz { background: linear-gradient(90deg, var(--modra-svetla), var(--oranz)); -webkit-background-clip: text; background-clip: text; color: transparent; }

/* úvod */
.uvod { padding: 64px 0 56px; }
.uvod__mrizka { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 56px; align-items: center; }
.uvod__popis { font-size: 1.15rem; color: var(--text-tlum); max-width: 560px; margin-bottom: 30px; }
.uvod__tlacitka { display: flex; flex-wrap: wrap; gap: 14px; margin-bottom: 36px; }
.uvod__body { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 12px; max-width: 600px; }
.uvod__body li { padding: 12px 14px; border: 1px solid var(--linka); border-radius: 12px; background: rgba(255,255,255,0.025); font-size: 0.86rem; color: var(--text-tlum); line-height: 1.4; }
.uvod__body strong { display: block; color: #fff; font-size: 0.95rem; margin-bottom: 2px; }
.uvod__foto { position: relative; }
.ramecek { position: relative; margin: 0; border-radius: 22px; overflow: hidden; border: 1px solid var(--linka-silna); background: var(--povrch); box-shadow: 0 30px 80px rgba(0,0,0,0.55), 0 0 0 1px rgba(11,102,209,0.15), 0 0 80px rgba(11,102,209,0.18); }
.ramecek img { width: 100%; aspect-ratio: 1 / 1; object-fit: cover; }
.ramecek::after { content: ""; position: absolute; inset: 0; background: linear-gradient(180deg, transparent 55%, rgba(11,13,16,0.85) 100%); pointer-events: none; }
.ramecek__roh { position: absolute; width: 22px; height: 22px; border: 2px solid var(--oranz); z-index: 2; }
.ramecek__roh--lh { top: 12px; left: 12px; border-right: 0; border-bottom: 0; border-top-left-radius: 6px; }
.ramecek__roh--ph { top: 12px; right: 12px; border-left: 0; border-bottom: 0; border-top-right-radius: 6px; }
.ramecek__roh--ld { bottom: 12px; left: 12px; border-right: 0; border-top: 0; border-bottom-left-radius: 6px; }
.ramecek__roh--pd { bottom: 12px; right: 12px; border-left: 0; border-top: 0; border-bottom-right-radius: 6px; }
.ramecek__popis { position: absolute; left: 0; right: 0; bottom: 0; z-index: 2; padding: 22px 26px; display: flex; justify-content: space-between; align-items: flex-end; gap: 16px; }
.ramecek__stav { font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.08em; text-transform: uppercase; color: #BFE4C8; display: inline-flex; align-items: center; gap: 8px; }
.ramecek__stav i { width: 8px; height: 8px; border-radius: 50%; background: #35D07F; box-shadow: 0 0 10px #35D07F; animation: puls 2s infinite; }
.ramecek__kdo { text-align: right; font-size: 0.9rem; font-weight: 600; color: #fff; line-height: 1.35; }
@keyframes puls { 0%, 100% { opacity: 1; } 50% { opacity: 0.35; } }
.hud { position: absolute; padding: 10px 14px; border-radius: 12px; border: 1px solid var(--linka-silna); background: rgba(17,21,27,0.85); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); display: flex; flex-direction: column; gap: 2px; box-shadow: 0 12px 30px rgba(0,0,0,0.4); z-index: 3; }
.hud span { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-tlum); }
.hud b { font-size: 1.1rem; font-weight: 800; color: #fff; }
.hud--1 { top: 28px; left: -26px; }
.hud--2 { bottom: 72px; right: -26px; }

/* pás technologií */
.pas { border-top: 1px solid var(--linka); border-bottom: 1px solid var(--linka); background: rgba(255,255,255,0.015); }
.pas__radek { display: flex; align-items: center; gap: 28px; padding: 18px 0; overflow: hidden; }
.pas__popisek { flex: none; font-family: var(--mono); font-size: 0.74rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-tlum); }
.pas__seznam { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 10px; }
.pas__seznam li { font-size: 0.86rem; font-weight: 600; color: var(--text); padding: 6px 12px; border: 1px solid var(--linka); border-radius: 999px; white-space: nowrap; }

/* sekce */
.sekce { padding: 96px 0; }
.sekce__hlava { max-width: 720px; margin-bottom: 48px; }
.sekce__popis { color: var(--text-tlum); font-size: 1.1rem; }
.karty { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.karta { position: relative; padding: 30px 28px; border: 1px solid var(--linka); border-radius: var(--radius); background: linear-gradient(180deg, var(--povrch-2), var(--povrch)); transition: transform .25s, border-color .25s, box-shadow .25s; }
.karta:hover { transform: translateY(-4px); border-color: rgba(61,139,255,0.5); box-shadow: 0 20px 50px rgba(0,0,0,0.45), 0 0 0 1px rgba(61,139,255,0.15); }
.karta--akcent { border-color: rgba(255,122,26,0.4); }
.karta--akcent::before { content: ""; position: absolute; inset: -1px; border-radius: inherit; padding: 1px; background: linear-gradient(135deg, rgba(255,122,26,0.7), rgba(11,102,209,0.6)); -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0); -webkit-mask-composite: xor; mask-composite: exclude; pointer-events: none; }
.karta__ikona { width: 52px; height: 52px; border-radius: 14px; display: grid; place-items: center; margin-bottom: 20px; color: var(--modra-svetla); background: rgba(11,102,209,0.14); border: 1px solid rgba(61,139,255,0.3); }
.karta__ikona svg { width: 28px; height: 28px; }
.karta p { color: var(--text-tlum); font-size: 0.98rem; }
.karta__body { margin: 18px 0 0; padding: 0; list-style: none; display: grid; gap: 9px; font-size: 0.92rem; }
.karta__body li { padding-left: 22px; position: relative; }
.karta__body li::before { content: ""; position: absolute; left: 0; top: 0.6em; width: 10px; height: 10px; border-radius: 3px; background: var(--modra); }
.karta--akcent .karta__body li::before { background: var(--oranz); }
.karta__odkaz { display: inline-block; margin-top: 20px; font-weight: 700; color: var(--oranz); }
.karta__odkaz:hover { color: #fff; }

/* evidence */
.sekce--evidence { background: linear-gradient(180deg, rgba(11,102,209,0.07), transparent 60%); border-top: 1px solid var(--linka); border-bottom: 1px solid var(--linka); }
.evidence { display: grid; grid-template-columns: 1fr 1fr; gap: 56px; align-items: center; }
.odrazky { list-style: none; margin: 0 0 30px; padding: 0; display: grid; gap: 12px; }
.odrazky li { padding-left: 30px; position: relative; color: var(--text-tlum); }
.odrazky li b { color: #fff; }
.odrazky li::before { content: ""; position: absolute; left: 0; top: 0.42em; width: 16px; height: 16px; border-radius: 5px; background: linear-gradient(135deg, var(--modra-svetla), var(--hlubina)); }
.okno { border-radius: 16px; border: 1px solid var(--linka-silna); background: var(--povrch); box-shadow: 0 30px 80px rgba(0,0,0,0.55), 0 0 60px rgba(11,102,209,0.14); overflow: hidden; font-size: 0.86rem; }
.okno__lista { display: flex; align-items: center; gap: 7px; padding: 12px 16px; border-bottom: 1px solid var(--linka); background: var(--povrch-2); }
.okno__lista span { width: 10px; height: 10px; border-radius: 50%; background: var(--linka-silna); }
.okno__lista span:first-child { background: var(--oranz); }
.okno__lista em { margin-left: auto; font-style: normal; font-family: var(--mono); font-size: 0.72rem; color: var(--text-tlum); }
.okno__telo { padding: 16px; }
.okno__radek { display: grid; grid-template-columns: 1fr 52px 36px 70px; gap: 10px; padding: 9px 10px; border-bottom: 1px solid var(--linka); align-items: center; }
.okno__radek span:nth-child(3), .okno__radek span:nth-child(4) { text-align: right; font-variant-numeric: tabular-nums; }
.okno__radek--hlava { font-family: var(--mono); font-size: 0.68rem; letter-spacing: 0.08em; text-transform: uppercase; color: var(--text-tlum); }
.okno__sklad { display: inline-block; font-family: var(--mono); font-size: 0.7rem; padding: 2px 7px; border-radius: 6px; background: rgba(11,102,209,0.2); color: var(--modra-svetla); text-align: center; }
.okno__souhrn { padding: 12px 10px 4px; display: grid; gap: 6px; }
.okno__souhrn div { display: flex; justify-content: space-between; color: var(--text-tlum); }
.okno__souhrn b { color: var(--text); font-variant-numeric: tabular-nums; }
.okno__celkem { padding-top: 8px; border-top: 1px dashed var(--linka-silna); font-size: 1rem; }
.okno__celkem b { color: #fff; font-size: 1.15rem; }
.okno__akce { display: flex; flex-wrap: wrap; gap: 8px; padding: 14px 10px 6px; }
.okno__tl { padding: 8px 12px; border-radius: 9px; border: 1px solid var(--linka-silna); font-weight: 700; font-size: 0.8rem; color: var(--text); }
.okno__tl--modra { background: var(--modra); border-color: var(--modra); color: #fff; }
.okno__tl--oranz { background: rgba(255,122,26,0.15); border-color: rgba(255,122,26,0.5); color: #FFB37A; }
.okno__log { margin: 12px 0 0; padding: 12px 10px 4px; border-top: 1px solid var(--linka); font-family: var(--mono); font-size: 0.72rem; color: var(--text-tlum); display: grid; gap: 6px; }
.okno__log i { font-style: normal; color: var(--modra-svetla); margin-right: 8px; }

/* kroky */
.kroky { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; counter-reset: krok; }
.krok { padding: 28px 24px; border: 1px solid var(--linka); border-radius: var(--radius); background: rgba(255,255,255,0.02); position: relative; }
.krok__cislo { display: inline-block; font-family: var(--mono); font-weight: 600; font-size: 0.85rem; color: var(--oranz); margin-bottom: 16px; padding-bottom: 10px; border-bottom: 1px solid rgba(255,122,26,0.35); }
.krok p { color: var(--text-tlum); font-size: 0.95rem; margin: 0; }

/* o nás */
.sekce--onas { border-top: 1px solid var(--linka); }
.onas { display: grid; grid-template-columns: 0.8fr 1.2fr; gap: 56px; align-items: center; }
.onas__foto { position: relative; border-radius: 22px; overflow: hidden; border: 1px solid var(--linka-silna); box-shadow: 0 30px 80px rgba(0,0,0,0.5); }
.onas__foto::after { content: ""; position: absolute; inset: 0; background: linear-gradient(135deg, rgba(11,102,209,0.22), transparent 50%, rgba(255,122,26,0.12)); mix-blend-mode: screen; pointer-events: none; }
.onas__foto img { aspect-ratio: 1 / 1; object-fit: cover; width: 100%; }
.onas__text p { color: var(--text-tlum); font-size: 1.05rem; }
.fakta { margin: 28px 0 0; display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.fakta div { padding: 14px 16px; border: 1px solid var(--linka); border-radius: 12px; background: rgba(255,255,255,0.02); }
.fakta dt { font-family: var(--mono); font-size: 0.7rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-tlum); margin-bottom: 4px; }
.fakta dd { margin: 0; font-weight: 600; font-size: 0.95rem; color: #fff; }

/* kontakt */
.sekce--kontakt { border-top: 1px solid var(--linka); background: radial-gradient(ellipse 60% 70% at 80% 50%, rgba(11,102,209,0.16), transparent 70%); }
.kontakt { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: 56px; align-items: center; }
.kontakt__karta { padding: 32px; border-radius: var(--radius); border: 1px solid var(--linka-silna); background: linear-gradient(180deg, var(--povrch-2), var(--povrch)); box-shadow: 0 30px 80px rgba(0,0,0,0.45); display: grid; gap: 18px; }
.kontakt__radek { display: grid; grid-template-columns: 110px 1fr; gap: 12px; align-items: baseline; padding-bottom: 14px; border-bottom: 1px solid var(--linka); }
.kontakt__radek:last-child { border-bottom: 0; padding-bottom: 0; }
.kontakt__radek a { font-size: 1.25rem; font-weight: 700; color: #fff; }
.kontakt__radek a:hover { color: var(--oranz); }
.kontakt__popisek { font-family: var(--mono); font-size: 0.72rem; letter-spacing: 0.1em; text-transform: uppercase; color: var(--text-tlum); }
.kontakt__radek--pozn span:last-child { color: var(--text-tlum); font-size: 0.92rem; }

/* patička */
.paticka { border-top: 1px solid var(--linka); padding: 28px 0; font-size: 0.86rem; color: var(--text-tlum); }
.paticka__radek { display: flex; justify-content: space-between; gap: 16px; flex-wrap: wrap; }

/* animace při zobrazení */
.animuj { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.animuj.je-videt { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .animuj { opacity: 1; transform: none; transition: none; }
  .ramecek__stav i { animation: none; }
}

/* tablet */
@media (max-width: 1000px) {
  .karty { grid-template-columns: 1fr; max-width: 640px; }
  .kroky { grid-template-columns: repeat(2, 1fr); }
  .uvod__mrizka { grid-template-columns: 1fr; gap: 40px; }
  .uvod__foto { max-width: 520px; margin-inline: auto; width: 100%; }
  .evidence, .onas, .kontakt { grid-template-columns: 1fr; gap: 40px; }
  .onas__foto { max-width: 420px; }
  .hud--1 { left: 8px; }
  .hud--2 { right: 8px; }
}
/* mobil */
@media (max-width: 720px) {
  body { font-size: 16px; }
  .menu { display: none; }
  .menu-tl { display: flex; }
  .hlavicka__radek { height: 64px; }
  .uvod { padding: 36px 0 40px; }
  .uvod__body { grid-template-columns: 1fr; }
  .uvod__tlacitka .tl { flex: 1 1 100%; }
  .sekce { padding: 64px 0; }
  .sekce__hlava { margin-bottom: 32px; }
  .kroky, .fakta { grid-template-columns: 1fr; }
  .pas__radek { flex-direction: column; align-items: flex-start; gap: 12px; }
  .kontakt__karta { padding: 22px; }
  .kontakt__radek { grid-template-columns: 1fr; gap: 4px; }
  .ramecek__popis { padding: 16px; flex-direction: column; align-items: flex-start; }
  .ramecek__kdo { text-align: left; }
  .hud { display: none; }
  .okno__radek { grid-template-columns: 1fr 44px 28px 60px; gap: 6px; font-size: 0.8rem; }
  .paticka__radek { flex-direction: column; }
}