/* ── Design tokeny ─────────────────────────────────────────────── */
:root {
  --bg: #070b15;
  --bg-soft: #0e1424;
  --bg-card: #121a2e;
  --border: #1f2940;
  --border-soft: #18213400;
  --text: #eaeff8;
  --text-dim: #9aa6be;
  --text-faint: #69748d;
  --buyer: #5b93ff;
  --buyer-soft: rgba(91, 147, 255, 0.12);
  --supplier: #25cfa0;
  --supplier-soft: rgba(37, 207, 160, 0.12);
  --accent: #9d72ff;
  --danger: #ff6385;
  --radius: 14px;
  --radius-lg: 24px;
  --maxw: 1160px;
  --font: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --display: "Space Grotesk", var(--font);
  --shadow: 0 24px 60px -20px rgba(0, 0, 0, 0.6);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }

/* gradient mesh pozadí */
body::before {
  content: "";
  position: fixed; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(700px circle at 8% -10%, rgba(91, 147, 255, 0.18), transparent 55%),
    radial-gradient(680px circle at 95% 2%, rgba(37, 207, 160, 0.14), transparent 50%),
    radial-gradient(900px circle at 50% 120%, rgba(157, 114, 255, 0.10), transparent 60%);
}
main, nav, footer { position: relative; z-index: 1; }

/* ── Nav ───────────────────────────────────────────────────────── */
nav {
  position: sticky; top: 0; z-index: 50;
  backdrop-filter: blur(14px);
  background: rgba(7, 11, 21, 0.7);
  border-bottom: 1px solid var(--border);
}
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 66px; }
.logo { display: flex; align-items: center; gap: 11px; font-family: var(--display); font-weight: 700; font-size: 19px; letter-spacing: -0.02em; }
.logo-tld { color: var(--text-faint); }
.brand { display: flex; align-items: center; gap: 10px; }
.by-brand { font-size: 12.5px; color: var(--text-faint); text-decoration: none; padding-top: 3px; }
.by-brand:hover { color: var(--text); }
.logo .dot {
  width: 28px; height: 28px; border-radius: 9px;
  background: linear-gradient(135deg, var(--buyer), var(--supplier));
  display: grid; place-items: center; font-size: 15px; font-weight: 800; color: #04121f;
  box-shadow: 0 4px 14px rgba(37, 207, 160, 0.35);
}
.nav-links { display: flex; align-items: center; gap: 26px; font-size: 14px; color: var(--text-dim); }
.nav-links > a:hover { color: var(--text); }
.nav-cta {
  padding: 9px 18px; border-radius: 10px; font-size: 14px; font-weight: 600;
  background: var(--text); color: var(--bg); transition: transform .15s, opacity .15s;
}
.nav-cta:hover { transform: translateY(-1px); opacity: .92; }
@media (max-width: 760px) { .nav-links > a:not(.nav-cta) { display: none; } }

/* language switcher */
.lang-select { position: relative; }
.lang-btn {
  display: inline-flex; align-items: center; gap: 7px; cursor: pointer;
  background: var(--bg-soft); border: 1px solid var(--border); color: var(--text-dim);
  border-radius: 10px; padding: 8px 12px; font-size: 13px; font-weight: 600; font-family: var(--font);
  transition: border-color .15s, color .15s;
}
.lang-btn:hover { color: var(--text); border-color: #2c3859; }
.lang-menu {
  position: absolute; top: calc(100% + 8px); right: 0; min-width: 168px;
  background: var(--bg-card); border: 1px solid var(--border); border-radius: 12px;
  padding: 6px; box-shadow: var(--shadow);
  opacity: 0; visibility: hidden; transform: translateY(-6px); transition: all .16s; z-index: 60;
}
.lang-menu.open { opacity: 1; visibility: visible; transform: none; }
.lang-menu button {
  display: flex; align-items: center; gap: 10px; width: 100%; text-align: left;
  background: transparent; border: none; color: var(--text-dim); cursor: pointer;
  padding: 9px 11px; border-radius: 8px; font-size: 14px; font-family: var(--font);
}
.lang-menu button:hover { background: var(--bg-soft); color: var(--text); }
.lang-menu button.active { color: var(--text); }
.lang-menu .code { font-weight: 700; font-size: 11px; color: var(--accent); width: 22px; }

/* ── Hero ──────────────────────────────────────────────────────── */
.hero { padding: 76px 0 40px; }
.hero-grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: 40px; align-items: center; }
@media (max-width: 940px) { .hero-grid { grid-template-columns: 1fr; } .hero-visual { order: -1; max-width: 360px; margin: 0 auto; } }

.badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: 999px;
  border: 1px solid var(--border); background: var(--bg-soft);
  font-size: 13px; color: var(--text-dim); margin-bottom: 26px;
}
.badge .pulse { width: 7px; height: 7px; border-radius: 50%; background: var(--supplier); box-shadow: 0 0 0 0 var(--supplier); animation: pulse 2.2s infinite; }
@keyframes pulse { 0% { box-shadow: 0 0 0 0 rgba(37,207,160,.5);} 70%{ box-shadow: 0 0 0 9px rgba(37,207,160,0);} 100%{ box-shadow:0 0 0 0 rgba(37,207,160,0);} }

.hero h1 {
  font-family: var(--display);
  font-size: clamp(34px, 4.8vw, 58px);
  line-height: 1.06; letter-spacing: -0.035em; font-weight: 700;
  margin-bottom: 22px;
}
.hero h1 .grad {
  background: linear-gradient(120deg, var(--buyer), var(--supplier));
  -webkit-background-clip: text; background-clip: text; color: transparent;
}
.hero p.lead { font-size: clamp(16px, 1.6vw, 19px); color: var(--text-dim); max-width: 560px; margin-bottom: 34px; }
.hero-cta { display: flex; gap: 14px; flex-wrap: wrap; }

.btn {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 15px 24px; border-radius: 12px; font-size: 15px; font-weight: 650;
  border: 1px solid transparent; cursor: pointer; font-family: var(--font);
  transition: transform .15s, box-shadow .15s, background .15s;
}
.btn:hover { transform: translateY(-2px); }
.btn-buyer { background: var(--buyer); color: #04132e; box-shadow: 0 10px 32px rgba(91,147,255,.3); }
.btn-supplier { background: var(--supplier); color: #042019; box-shadow: 0 10px 32px rgba(37,207,160,.28); }
.btn-block { width: 100%; justify-content: center; }
.btn small { font-weight: 500; opacity: .82; }

.hero-note { margin-top: 22px; font-size: 13.5px; color: var(--text-faint); }

/* hero ilustrace */
.hero-visual svg { width: 100%; height: auto; filter: drop-shadow(0 30px 60px rgba(0,0,0,.5)); }
.wire { animation: dash 1.4s linear infinite; }
@keyframes dash { to { stroke-dashoffset: -28; } }
.node-b { animation: floaty 6s ease-in-out infinite; transform-origin: 120px 130px; }
.node-s { animation: floaty 6s ease-in-out infinite 1.4s; transform-origin: 300px 290px; }
@keyframes floaty { 0%,100% { transform: translateY(0);} 50% { transform: translateY(-8px);} }
.orbit { animation: floaty 4s ease-in-out infinite; }
.o2 { animation-delay: .6s; } .o3 { animation-delay: 1.1s; }

/* ── Stats band ────────────────────────────────────────────────── */
.stats { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px; background: var(--border); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; margin: 48px 0 8px; }
.stat { background: var(--bg-soft); padding: 30px 24px; text-align: center; transition: background .2s; }
.stat:hover { background: var(--bg-card); }
.stat .num { font-family: var(--display); font-size: clamp(26px, 3.4vw, 38px); font-weight: 700; letter-spacing: -0.03em; }
.stat .num.b { color: var(--buyer); } .stat .num.s { color: var(--supplier); } .stat .num.a { color: var(--accent); }
.stat .lbl { font-size: 13.5px; color: var(--text-dim); margin-top: 7px; }
@media (max-width: 720px) { .stats { grid-template-columns: 1fr; } }

/* ── Sekce ─────────────────────────────────────────────────────── */
section { padding: 70px 0; }
.section-head { text-align: center; max-width: 640px; margin: 0 auto 50px; }
.section-head .eyebrow { font-size: 12.5px; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; color: var(--accent); }
.section-head h2 { font-family: var(--display); font-size: clamp(27px, 3.4vw, 38px); letter-spacing: -0.03em; margin: 13px 0 14px; font-weight: 700; }
.section-head p { color: var(--text-dim); font-size: 16px; }

.personas { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
@media (max-width: 820px) { .personas { grid-template-columns: 1fr; } }
.persona {
  background: linear-gradient(180deg, var(--bg-card), var(--bg-soft));
  border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 36px;
  position: relative; overflow: hidden; transition: transform .2s, border-color .2s;
}
.persona::after { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 3px; opacity: .8; }
.persona.buyer::after { background: linear-gradient(90deg, var(--buyer), transparent); }
.persona.supplier::after { background: linear-gradient(90deg, var(--supplier), transparent); }
.persona:hover { transform: translateY(-4px); }
.persona.buyer:hover { border-color: rgba(91,147,255,.5); }
.persona.supplier:hover { border-color: rgba(37,207,160,.5); }
.persona .tag { display: inline-block; font-size: 12px; font-weight: 700; letter-spacing: .04em; text-transform: uppercase; padding: 5px 11px; border-radius: 8px; margin-bottom: 18px; }
.persona.buyer .tag { background: var(--buyer-soft); color: var(--buyer); }
.persona.supplier .tag { background: var(--supplier-soft); color: var(--supplier); }
.persona h3 { font-family: var(--display); font-size: 22px; letter-spacing: -0.02em; margin-bottom: 12px; line-height: 1.25; }
.persona .pain { color: var(--text-dim); font-size: 15px; margin-bottom: 22px; }
.persona ul { list-style: none; display: flex; flex-direction: column; gap: 12px; margin-bottom: 28px; }
.persona li { display: flex; gap: 11px; font-size: 14.5px; align-items: flex-start; }
.persona li .ic { flex: 0 0 auto; width: 21px; height: 21px; border-radius: 6px; display: grid; place-items: center; font-size: 12px; margin-top: 1px; }
.persona.buyer li .ic { background: var(--buyer-soft); color: var(--buyer); }
.persona.supplier li .ic { background: var(--supplier-soft); color: var(--supplier); }

.steps { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
@media (max-width: 880px) { .steps { grid-template-columns: 1fr 1fr; } }
@media (max-width: 520px) { .steps { grid-template-columns: 1fr; } }
.step { background: var(--bg-soft); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; transition: transform .2s, border-color .2s; }
.step:hover { transform: translateY(-3px); border-color: #2c3859; }
.step .n { font-family: var(--display); font-size: 12.5px; font-weight: 600; color: var(--accent); margin-bottom: 14px; letter-spacing: .03em; }
.step h4 { font-size: 16px; margin-bottom: 9px; letter-spacing: -0.01em; }
.step p { font-size: 13.5px; color: var(--text-dim); }

.trust { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
@media (max-width: 820px) { .trust { grid-template-columns: 1fr; } }
.trust .item { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; transition: transform .2s; }
.trust .item:hover { transform: translateY(-3px); }
.trust .item .ic { font-size: 24px; margin-bottom: 15px; }
.trust .item h4 { font-size: 16.5px; margin-bottom: 9px; }
.trust .item p { font-size: 14px; color: var(--text-dim); }

/* ── Začít (registrace) ────────────────────────────────────────── */
.signup { padding: 80px 0; }
.signup-card {
  background: linear-gradient(180deg, var(--bg-card), var(--bg-soft));
  border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 46px; max-width: 740px; margin: 0 auto; box-shadow: var(--shadow);
}
@media (max-width: 560px) { .signup-card { padding: 28px 20px; } }
.start-options { display: grid; grid-template-columns: 1fr 1fr; gap: 14px; }
@media (max-width: 560px) { .start-options { grid-template-columns: 1fr; } }
.start-option {
  display: flex; flex-direction: column; gap: 6px; padding: 22px;
  background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius);
  transition: transform .18s, border-color .18s, box-shadow .18s;
}
.start-option:hover { transform: translateY(-3px); }
.start-option.buyer:hover, .start-option.buyer:focus-visible { border-color: var(--buyer); box-shadow: 0 0 0 3px var(--buyer-soft); }
.start-option.supplier:hover, .start-option.supplier:focus-visible { border-color: var(--supplier); box-shadow: 0 0 0 3px var(--supplier-soft); }
.start-option .start-ic { font-size: 26px; margin-bottom: 4px; }
.start-option strong { font-family: var(--display); font-size: 18px; }
.start-option.buyer strong { color: var(--buyer); }
.start-option.supplier strong { color: var(--supplier); }
.start-option span:not(.start-ic) { font-size: 14px; color: var(--text-dim); }
.start-foot { margin-top: 22px; text-align: center; font-size: 14px; color: var(--text-faint); }
.start-foot a, .hero-note a { color: var(--text); text-decoration: underline; text-underline-offset: 3px; }

/* ── Footer ────────────────────────────────────────────────────── */
footer { border-top: 1px solid var(--border); padding: 42px 0; margin-top: 30px; }
.footer-legal { flex-basis: 100%; }
.footer-legal a { color: var(--text-faint); }
.footer-inner { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 14px; color: var(--text-faint); font-size: 13.5px; }

.fade { opacity: 0; transform: translateY(20px); transition: opacity .6s ease, transform .6s ease; }
.fade.in { opacity: 1; transform: none; }

/* ── Kompatibilita (integrace) ─────────────────────────────────── */
.compat-flow { display: flex; justify-content: center; align-items: center; flex-wrap: wrap; gap: 10px 14px; margin: -26px auto 34px; font-size: 14px; color: var(--text-dim); }
.compat-flow span:not(.arrow) { padding: 7px 14px; border-radius: 999px; border: 1px solid var(--border); background: var(--bg-soft); }
.compat-flow .arrow { color: var(--accent); font-weight: 700; }
.compat { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }
@media (max-width: 900px) { .compat { grid-template-columns: 1fr; } }
.compat-group { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; gap: 10px; }
.compat-group .ic { font-size: 24px; }
.compat-group h4 { font-size: 16.5px; }
.compat-group p { font-size: 14px; color: var(--text-dim); }
.chips { list-style: none; padding: 0; margin: 6px 0 0; display: flex; flex-wrap: wrap; gap: 8px; }
.chips li { font-size: 13px; font-weight: 600; padding: 6px 11px; border-radius: 9px; background: var(--bg-soft); border: 1px solid var(--border); color: var(--text); }
.chips li.beta::after { content: "β"; margin-left: 5px; color: var(--accent); font-weight: 700; }
.compat-cta { display: flex; flex-direction: column; align-items: center; gap: 14px; margin-top: 30px; text-align: center; }
.compat-note { font-size: 13px; color: var(--text-faint); max-width: 680px; }
.compat-note a { color: var(--text-dim); text-decoration: underline; text-underline-offset: 3px; }
@media (max-width: 600px) {
  .compat-flow { flex-direction: column; gap: 6px; margin-top: -30px; }
  .compat-flow .arrow { transform: rotate(90deg); }
}
/* 23 jazyků: nabídka ve dvou sloupcích, při malé výšce okna se posouvá */
.lang-menu { display: grid; grid-template-columns: repeat(2, minmax(140px, 1fr)); max-height: min(70vh, 560px); overflow-y: auto; }
@media (max-width: 420px) { .lang-menu { grid-template-columns: 1fr; } }