/* Preflighter.app landing — dark, na značce toolu, bez JS (rychlý LCP). */

/* Space Grotesk (self-hosted, OFL) — bez Google CDN kvůli soukromí a rychlosti */
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url(/fonts/space-grotesk-latin-ext.woff2) format("woff2");
  unicode-range: U+0100-02BA, U+02BD-02C5, U+02C7-02CC, U+02CE-02D7, U+02DD-02FF, U+0304, U+0308, U+0329, U+1D00-1DBF, U+1E00-1E9F, U+1EF2-1EFF, U+2020, U+20A0-20AB, U+20AD-20C0, U+2113, U+2C60-2C7F, U+A720-A7FF;
}
@font-face {
  font-family: "Space Grotesk";
  font-style: normal;
  font-weight: 300 700;
  font-display: swap;
  src: url(/fonts/space-grotesk-latin.woff2) format("woff2");
  unicode-range: U+0000-00FF, U+0131, U+0152-0153, U+02BB-02BC, U+02C6, U+02DA, U+02DC, U+0304, U+0308, U+0329, U+2000-206F, U+20AC, U+2122, U+2191, U+2193, U+2212, U+2215, U+FEFF, U+FFFD;
}

:root {
  --bg: #1c1f24;
  --bg2: #23262b;
  --panel: #16181c;
  --text: #e8e8e8;
  --muted: #9aa4b0;
  --muted2: #77808a;
  --accent: #6aa9ff;
  --accent-ink: #0e1830;
  --yellow: #ffe08a;
  --border: #2c313a;
  --border2: #3a4048;
  --maxw: 1080px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0; background: var(--bg); color: var(--text);
  font: 16px/1.6 "Space Grotesk", -apple-system, "Segoe UI", Roboto, sans-serif;
  -webkit-font-smoothing: antialiased;
}
a { color: var(--accent); text-decoration: none; }
a:hover { text-decoration: underline; }
img { max-width: 100%; height: auto; display: block; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* --- nav --- */
.nav {
  position: sticky; top: 0; z-index: 20;
  background: rgba(22,24,28,.88); backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--border);
}
.nav .wrap { display: flex; align-items: center; gap: 16px; height: 60px; }
.brand { font-size: 19px; font-weight: 700; color: var(--text); letter-spacing: -.01em; }
.brand:hover { text-decoration: none; }
.nav-spacer { flex: 1; }
/* jazykový přepínač = select (dropdown); škáluje na víc jazyků */
.langsel { background: var(--panel); color: var(--text);
  border: 1px solid var(--border2); border-radius: 6px;
  padding: 5px 8px 5px 10px; font: inherit; font-size: 14px; cursor: pointer; }
.langsel:hover { border-color: #4a5462; }

/* --- buttons --- */
.btn {
  display: inline-block; padding: 12px 22px; border-radius: 8px;
  font-weight: 600; font-size: 15px; cursor: pointer; border: 1px solid transparent;
  transition: transform .06s ease, background .15s ease;
}
.btn:hover { text-decoration: none; }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--accent); color: var(--accent-ink); }
.btn-primary:hover { background: #85baff; }
.btn-ghost { background: transparent; color: var(--text); border-color: var(--border2); }
.btn-ghost:hover { background: #2a2f36; }
.btn-sm { padding: 8px 16px; font-size: 14px; }

/* --- hero --- */
.hero { padding: 72px 0 40px; text-align: center; }
.hero h1 {
  font-size: clamp(30px, 5vw, 48px); line-height: 1.1; margin: 0 auto 18px;
  max-width: 15ch; letter-spacing: -.02em; font-weight: 700;
}
.hero .lead { font-size: clamp(17px, 2.4vw, 21px); color: var(--muted);
  max-width: 46ch; margin: 0 auto 28px; }
.hero-cta { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.trust-line { margin-top: 18px; color: var(--muted2); font-size: 14px; }
.trust-line b { color: var(--muted); font-weight: 600; }

.shot {
  margin: 48px auto 0; max-width: 960px;
  border: 1px solid var(--border2); border-radius: 12px; overflow: hidden;
  box-shadow: 0 24px 60px rgba(0,0,0,.5);
}

/* --- sections --- */
section { padding: 56px 0; }
.section-head { text-align: center; max-width: 40ch; margin: 0 auto 40px; }
.section-head h2 { font-size: clamp(24px, 3.4vw, 34px); margin: 0 0 10px;
  letter-spacing: -.01em; }
.section-head p { color: var(--muted); margin: 0; font-size: 17px; }
.alt { background: var(--bg2); border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border); }

/* --- feature grid --- */
.grid { display: grid; gap: 18px; grid-template-columns: repeat(3, 1fr); }
@media (max-width: 800px) { .grid { grid-template-columns: 1fr; } }
.card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; padding: 22px;
}
.card h3 { margin: 0 0 8px; font-size: 18px; }
.card p { margin: 0; color: var(--muted); font-size: 15px; }
.card .ico { font-size: 22px; margin-bottom: 12px; display: block; }

/* --- trust list --- */
.trust { display: grid; gap: 16px; grid-template-columns: repeat(2, 1fr); max-width: 820px;
  margin: 0 auto; }
@media (max-width: 700px) { .trust { grid-template-columns: 1fr; } }
.trust li { list-style: none; padding-left: 30px; position: relative; color: var(--muted); }
.trust { padding-left: 0; }
.trust li b { color: var(--text); font-weight: 600; }
.trust li::before { content: "✓"; position: absolute; left: 0; top: 0;
  color: var(--accent); font-weight: 700; }
.note-gs { max-width: 700px; margin: 28px auto 0; padding: 14px 18px;
  border: 1px solid var(--border2); border-radius: 8px; background: var(--panel);
  color: var(--muted); font-size: 14px; text-align: center; }
.note-gs b { color: var(--text); }

/* --- FAQ --- */
.faq { max-width: 760px; margin: 0 auto; }
.faq details { border-bottom: 1px solid var(--border); padding: 6px 0; }
.faq summary { cursor: pointer; font-weight: 600; padding: 12px 0; font-size: 17px;
  list-style: none; display: flex; justify-content: space-between; align-items: center; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; color: var(--muted); font-weight: 400; font-size: 22px; }
.faq details[open] summary::after { content: "−"; }
.faq p { margin: 0 0 14px; color: var(--muted); }

/* --- final CTA --- */
.cta-final { text-align: center; }
.cta-final h2 { font-size: clamp(24px, 3.4vw, 32px); margin: 0 0 20px; }

/* --- footer --- */
footer { border-top: 1px solid var(--border); padding: 32px 0; color: var(--muted2);
  font-size: 14px; }
footer .wrap { display: flex; flex-wrap: wrap; gap: 16px; align-items: center; }
footer .foot-spacer { flex: 1; }
footer a { color: var(--muted); }

/* --- guide (návod) --- */
.guide { max-width: 760px; margin: 0 auto; padding: 44px 0 8px; }
.breadcrumb { color: var(--muted2); font-size: 13px; margin-bottom: 18px; }
.breadcrumb a { color: var(--muted); }
.guide h1 { font-size: clamp(28px, 4.5vw, 40px); line-height: 1.15; margin: 0 0 14px;
  letter-spacing: -.02em; }
.guide .lead { font-size: 18px; color: var(--muted); margin: 0 0 6px; }
.guide h2 { font-size: 21px; margin: 38px 0 8px; letter-spacing: -.01em; }
.guide p { margin: 0 0 12px; color: #d3d9df; }
.in-tool { border-left: 3px solid var(--accent); background: var(--panel);
  padding: 9px 14px; border-radius: 0 6px 6px 0; font-size: 14px; color: var(--muted);
  margin: 0 0 12px; }
.in-tool b { color: var(--text); }
.guide-cta { margin: 40px 0 8px; padding-top: 28px; border-top: 1px solid var(--border);
  text-align: center; }
.guide-cta h2 { margin: 0 0 16px; }

/* promo blok návodu na landingu */
.guide-promo { display: flex; align-items: center; justify-content: space-between;
  gap: 20px; flex-wrap: wrap; background: var(--panel);
  border: 1px solid var(--border2); border-radius: 12px; padding: 22px 26px; }
.guide-promo h2 { margin: 0 0 4px; font-size: 20px; }
.guide-promo p { margin: 0; color: var(--muted); font-size: 15px; max-width: 62ch; }
.guide-promo .btn { flex: none; }