/* Písmo značky: Manrope (SIL Open Font License, viz fonts/OFL.txt), variabilní řez 200–800,
   podmnožina latinka + latinka rozšířená (čeština). Hostováno lokálně – žádné externí servery. */
@font-face {
  font-family: "Manrope";
  src: url("fonts/manrope-latin-var.woff2") format("woff2");
  font-weight: 200 800;
  font-style: normal;
  font-display: swap;
}

/* Paleta viz PLAN.md – primární #954FEB (kontrast 4,57 : 1 s bílou, 4,60 : 1 s černou) */
:root {
  --purple-50:  #F7F2FD;
  --purple-100: #EFE5FB;
  --purple-200: #DEC8F9;
  --purple-300: #C8A3F5;
  --purple-400: #AC75F0;
  --purple-500: #954FEB; /* primary */
  --purple-600: #7118DC;
  --purple-700: #5E14B8;
  --purple-800: #4B1093;
  --purple-900: #391169;
  --purple-950: #230B42;

  --bg: #FFFFFF;
  --bg-tinted: var(--purple-50);
  --surface: #FFFFFF;
  --text: #14101A;
  --text-muted: #4D4459;
  --border: var(--purple-100);
  --link: var(--purple-600);
  --accent-text: var(--purple-700);
  --primary: var(--purple-500);
  --primary-hover: var(--purple-600);
  --on-primary: #FFFFFF;
  --icon-bg: var(--purple-100);
  --icon-fg: var(--purple-700);
  --footer-bg: var(--purple-950);
  --footer-text: #E9E2F3;
  --footer-link: var(--purple-300);

  --net-line: var(--purple-200);
  --net-flow: var(--purple-500);
  --net-node-bg: #FFFFFF;
  --net-node-border: var(--purple-300);
  --net-icon: var(--purple-700);
  --net-small: var(--purple-400);
  --net-glow: color-mix(in srgb, var(--purple-500) 22%, transparent);

  color-scheme: light;

  --radius: 14px;
  --container: 1120px;
  --font: "Manrope", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Tmavý režim: podle systému, pokud uživatel ručně nezvolil světlý; nebo ruční volba */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #000000;
    --bg-tinted: #0E0718;
    --surface: #120A1F;
    --text: #F4F0FA;
    --text-muted: #B9AFC8;
    --border: #2A1A42;
    --link: var(--purple-300);
    --accent-text: var(--purple-300);
    --on-primary: #FFFFFF;
    --icon-bg: #24133D;
    --icon-fg: var(--purple-300);
    --footer-bg: #0B0614;

    --net-line: #3A2560;
    --net-flow: var(--purple-400);
    --net-node-bg: #120A1F;
    --net-node-border: #5B3A8F;
    --net-icon: var(--purple-300);
    --net-small: var(--purple-500);
    --net-glow: color-mix(in srgb, var(--purple-500) 35%, transparent);

    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #000000;
  --bg-tinted: #0E0718;
  --surface: #120A1F;
  --text: #F4F0FA;
  --text-muted: #B9AFC8;
  --border: #2A1A42;
  --link: var(--purple-300);
  --accent-text: var(--purple-300);
  --on-primary: #FFFFFF;
  --icon-bg: #24133D;
  --icon-fg: var(--purple-300);
  --footer-bg: #0B0614;

  --net-line: #3A2560;
  --net-flow: var(--purple-400);
  --net-node-bg: #120A1F;
  --net-node-border: #5B3A8F;
  --net-icon: var(--purple-300);
  --net-small: var(--purple-500);
  --net-glow: color-mix(in srgb, var(--purple-500) 35%, transparent);

  color-scheme: dark;
}

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

html { scroll-behavior: smooth; }

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 1.0625rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 { line-height: 1.15; margin: 0 0 .5em; }
h1 { font-size: clamp(2.4rem, 6vw, 4.25rem); letter-spacing: -0.03em; }
h2 { font-size: clamp(1.8rem, 3.5vw, 2.5rem); letter-spacing: -0.02em; }
h3 { font-size: 1.2rem; }
p { margin: 0 0 1em; }

a { color: var(--link); }
a:hover { text-decoration-thickness: 2px; }

:focus-visible {
  outline: 3px solid var(--primary);
  outline-offset: 3px;
  border-radius: 4px;
}

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 20px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  padding: .75rem 1rem;
  background: var(--primary);
  color: var(--on-primary);
  z-index: 100;
}
.skip-link:focus { left: 1rem; top: 1rem; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  background: color-mix(in srgb, var(--bg) 85%, transparent);
  backdrop-filter: saturate(180%) blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 68px;
}
.logo, .footer-logo {
  font-weight: 800;
  font-size: 1.4rem;
  letter-spacing: -0.02em;
  color: var(--text);
  text-decoration: none;
}
.logo span, .footer-logo span { color: var(--primary); }
.logo { display: inline-flex; align-items: center; gap: .55rem; }
.logo-signet { width: 32px; height: 32px; flex: none; }
.logo .logo-text { color: var(--text); }
.logo .logo-text span { color: var(--primary); }
.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}
.nav a:not(.btn) {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}
.nav a:not(.btn):hover { color: var(--accent-text); }
.header-actions { display: flex; align-items: center; gap: 1rem; }
.theme-toggle {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  cursor: pointer;
  transition: border-color .15s, color .15s;
}
.theme-toggle:hover { border-color: var(--primary); color: var(--accent-text); }
.theme-toggle svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: none; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) .theme-toggle .icon-sun { display: block; }
  :root:not([data-theme="light"]) .theme-toggle .icon-moon { display: none; }
}

/* Buttons */
.btn {
  display: inline-block;
  padding: .85rem 1.5rem;
  border-radius: 999px;
  background: var(--primary);
  color: var(--on-primary);
  font-weight: 600;
  text-decoration: none;
  border: 2px solid var(--primary);
  transition: background .15s, border-color .15s;
}
.btn:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn-ghost {
  background: transparent;
  color: var(--accent-text);
  border-color: currentColor;
}
.btn-ghost:hover { background: var(--icon-bg); border-color: var(--accent-text); }
.btn-small { padding: .5rem 1.1rem; }
.btn-large { font-size: 1.25rem; padding: 1rem 2rem; }

/* Hero */
.hero {
  padding: clamp(4rem, 12vw, 8rem) 0 clamp(3.5rem, 10vw, 6rem);
  background:
    radial-gradient(60rem 30rem at 85% -10%, color-mix(in srgb, var(--primary) 22%, transparent), transparent 70%),
    var(--bg);
}
.eyebrow {
  color: var(--accent-text);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-size: .85rem;
}
.lead {
  font-size: clamp(1.15rem, 2vw, 1.35rem);
  color: var(--text-muted);
  max-width: 40rem;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2rem; }

.hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}
.network {
  display: block;
  width: 100%;
  max-width: 460px;
  height: auto;
  margin: 0 auto;
  overflow: visible;
}
@media (min-width: 900px) {
  .hero-inner { grid-template-columns: 1.15fr 1fr; gap: 3rem; }
}
@media (max-width: 899px) {
  .network { max-width: 380px; }
}

/* Síťová grafika */
.net-links path {
  fill: none;
  stroke: var(--net-line);
  stroke-width: 2;
}
.net-links path.thin { stroke-width: 1.25; stroke-dasharray: 3 5; }
.net-flow path {
  fill: none;
  stroke: var(--net-flow);
  stroke-width: 3;
  stroke-linecap: round;
  stroke-dasharray: 4 18;
  animation: net-flow var(--d, 3s) linear infinite;
}
.net-flow path.reverse { animation-direction: reverse; }
.net-small circle {
  fill: var(--net-small);
  animation: net-blink 2.8s ease-in-out infinite;
  animation-delay: var(--delay, 0s);
}
.net-node > circle {
  fill: var(--net-node-bg);
  stroke: var(--net-node-border);
  stroke-width: 1.5;
}
.net-node g {
  fill: none;
  stroke: var(--net-icon);
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}
.net-hub .core { fill: var(--primary); }
.net-hub .mark { fill: none; stroke: #FFFFFF; stroke-width: 6; }
.net-hub .mark-dot { fill: #FFFFFF; }
.net-hub .pulse {
  fill: var(--net-glow);
  transform-box: fill-box;
  transform-origin: center;
  animation: net-pulse 3s ease-out infinite;
}
.net-hub .pulse-2 { animation-delay: 1.5s; }

@keyframes net-flow { to { stroke-dashoffset: -44; } }
@keyframes net-pulse {
  from { transform: scale(1); opacity: 1; }
  to   { transform: scale(1.9); opacity: 0; }
}
@keyframes net-blink {
  0%, 100% { opacity: 1; }
  50%      { opacity: .35; }
}

@media (prefers-reduced-motion: reduce) {
  .net-flow path, .net-small circle, .net-hub .pulse { animation: none; }
  .net-hub .pulse { opacity: .5; }
}

/* Sections */
.section { padding: clamp(3.5rem, 9vw, 6rem) 0; }
.section-tinted { background: var(--bg-tinted); }
.section-lead { color: var(--text-muted); font-size: 1.15rem; max-width: 40rem; }

/* Cards */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(300px, 100%), 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.75rem;
  transition: border-color .15s, transform .15s;
}
.card:hover { border-color: var(--primary); transform: translateY(-2px); }
.card p { color: var(--text-muted); }
.card ul { margin: 0; padding-left: 1.2rem; }
.card li { margin-bottom: .35rem; }
.card li::marker { color: var(--primary); }
.card-icon {
  width: 48px;
  height: 48px;
  border-radius: 12px;
  display: grid;
  place-items: center;
  background: var(--icon-bg);
  color: var(--icon-fg);
  margin-bottom: 1.1rem;
}
.card-icon svg {
  width: 26px;
  height: 26px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Benefits */
.benefits {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(min(220px, 100%), 1fr));
  gap: 2rem;
  margin-top: 2rem;
}
.benefit {
  border-left: 3px solid var(--primary);
  padding-left: 1.1rem;
}
.benefit p { color: var(--text-muted); margin: 0; }

/* Contact */
.contact { text-align: center; }
.contact .section-lead { margin: 0 auto 2rem; }

/* Footer */
.site-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  padding: 3.25rem 0 1.25rem;
  font-size: .95rem;
}
.site-footer a { color: var(--footer-link); }
address { font-style: normal; line-height: 1.65; }
.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1.5rem, 4vw, 3.5rem);
}
.footer-card { min-width: 0; }
.footer-heading {
  display: flex;
  align-items: center;
  gap: .8rem;
  min-height: 2.5rem;
}
.footer-heading h2 {
  margin: 0;
  color: #FFFFFF;
  font-size: 1rem;
  font-weight: 700;
}
.footer-icon {
  display: inline-grid;
  place-items: center;
  flex: 0 0 2.5rem;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid rgba(200, 163, 245, .4);
  border-radius: .85rem;
  background: rgba(149, 79, 235, .15);
  color: var(--purple-300);
}
.footer-icon svg {
  width: 1.3rem;
  height: 1.3rem;
  fill: none;
  stroke: currentColor;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-width: 1.7;
}
.footer-accent {
  height: 2px;
  margin: .9rem 0 1rem;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--purple-300), var(--purple-600));
}
.footer-name { margin: 0 0 .4rem; color: #FFFFFF; font-weight: 700; }
.footer-details, .footer-links {
  display: grid;
  gap: .65rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.footer-details li { display: flex; flex-direction: column; gap: .1rem; }
.footer-detail-label { color: rgba(255, 255, 255, .68); font-size: .82rem; }
.footer-details strong { font-weight: 600; }
.footer-card a { text-decoration: none; overflow-wrap: anywhere; }
.footer-card a:hover { text-decoration: underline; text-underline-offset: .18em; }
.footer-links { gap: .55rem; }
.footer-legal {
  margin-top: 2.4rem;
  padding-top: 1.4rem;
  border-top: 1px solid rgba(255, 255, 255, .18);
  text-align: center;
  line-height: 1.65;
}
.footer-legal p { margin: .2rem 0; }
.footer-legal p:first-child { color: #FFFFFF; font-weight: 700; }
.footer-bottom {
  margin-top: 1rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(255, 255, 255, .1);
  color: rgba(255, 255, 255, .72);
  font-size: .85rem;
  text-align: center;
}
.footer-bottom p { margin: 0; }

@media (max-width: 800px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-card:last-child { grid-column: 1 / -1; }
  .footer-links { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 560px) {
  .nav { gap: 1rem; }
  .nav li:not(:last-child) { display: none; }
  .header-actions { gap: .6rem; }
  .hero-actions .btn { flex: 1 1 auto; text-align: center; }
  .footer-grid { grid-template-columns: 1fr; gap: 1.8rem; }
  .footer-card:last-child { grid-column: auto; }
  .footer-links { grid-template-columns: 1fr; }
  .footer-legal { text-align: left; }
}