/* =========================
   1) Design tokens
========================= */
:root{
  --bg: #f7f8fb;
  --panel: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --line: rgba(15, 23, 42, .12);
  --line2: rgba(15, 23, 42, .08);
  --link: #0f172a;
  --link2: #334155;

  --shadow: 0 18px 45px rgba(15, 23, 42, .10);
  --shadow2: 0 8px 18px rgba(15, 23, 42, .08);

  --radius: 18px;
  --container-w: 980px;

  /* ✅ Single source of truth */
  --header-h: 104px;          /* desktop header total height */
  --header-h-m: 92px;         /* mobile header total height */

  --gap-after-header: 28px;   /* air under header (desktop) */
  --gap-after-header-m: 18px; /* air under header (mobile) */

  --logo-h: 24px;
  --logo-h-m: 20px;

  /* top row height inside header */
  --header-top-row: 44px;
  --header-top-row-m: 40px;
}

/* =========================
   2) Base / Reset
========================= */
*{ box-sizing:border-box; }
html,body{ height:100%; }

html{
  background:
    radial-gradient(1200px 700px at 10% -10%, rgba(37,99,235,.10), transparent 55%),
    radial-gradient(1200px 700px at 90% 0%, rgba(56,189,248,.08), transparent 55%),
    var(--bg);
  background-repeat:no-repeat;
  background-size:100% 100%;
}

body{
  margin:0;
  color:var(--text);
  background: transparent;
  font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Arial, "Noto Sans", "Helvetica Neue", sans-serif;
  line-height:1.65;

  /* ✅ reserve exact space for fixed header + desired gap */
  padding-top: calc(var(--header-h) + var(--gap-after-header));

  /* ✅ prevent page horizontal scroll */
  overflow-x: clip;
}
@supports not (overflow-x: clip){
  body{ overflow-x: hidden; }
}

img, svg{ max-width:100%; height:auto; }

a{ color:var(--link); text-decoration:none; }
a:hover{ text-decoration:underline; }
small{ color:var(--muted); }

.container{
  width: min(var(--container-w), calc(100% - 32px));
  margin: 0 auto;
}


/* =========================
   3) Header (fixed + fixed height)
========================= */
header{
  position: fixed;
  top:0; left:0; right:0;
  z-index: 1000;

  height: var(--header-h); /* ✅ locked */
  background: rgba(247,248,251,.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line2);
}

header .container{
  height: 100%;
  position: relative;
  padding: 0;

  /* ✅ stable 2-row layout */
  display: grid;
  grid-template-rows: var(--header-top-row) 1fr;
  align-items: center;
}

/* Logo in top row */
.logo{
  grid-row: 1;
  display:inline-flex;
  align-items:center;
  padding: 6px 4px;
}
.logo img{
  height: var(--logo-h);
  width:auto;
  display:block;
}
.logo:hover{ opacity:.85; }

/* Nav in bottom row */
header nav{
  grid-row: 2;
  display:flex;
  align-items:center;
  gap:10px;
  margin: 0;

  flex-wrap: wrap; /* desktop: ok */
}

/* Items */
header nav a, header nav strong{
  display:inline-flex;
  align-items:center;
  padding:7px 10px;
  border-radius:10px;
  border:1px solid transparent;
  max-width:100%;
}

header nav a{ color: var(--link2); }
header nav a:hover{
  color: var(--text);
  border-color: var(--line2);
  background: rgba(15,23,42,.03);
  text-decoration:none;
}

header nav strong{
  color: #4298b5;
  background: rgba(66, 152, 181, 0.08);
  border-color: rgba(66, 152, 181, 0.18);
}

/* Language block pinned top-right (ignore inline-style safely) */
header nav .lang{
  position: absolute;
  top: 10px;
  right: 0;
  margin-left: 0 !important;

  display:flex;
  gap:10px;
}

/* =========================
   4) Main card
========================= */
main.container{
  padding: 22px 20px 26px;
  border: 1px solid var(--line2);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: var(--shadow);
}

main.container > h1{
  font-size: clamp(26px, 3vw, 38px);
  line-height:1.15;
  margin: 6px 0 12px;
  letter-spacing:-.4px;
}

main.container > p{
  color:var(--muted);
  max-width: 85ch;
}

/* Content */
h2{
  margin:22px 0 10px;
  font-size: 18px;
  letter-spacing:-.2px;
}

h3{
  margin:18px 0 8px;
  font-size: 16px;
  color: rgba(15,23,42,.92);
}

ul{
  padding-left: 18px;
  margin: 10px 0 14px;
}

li{ margin: 6px 0; }
p strong{ color: rgba(15,23,42,.95); }

hr{
  border:0;
  border-top:1px solid var(--line2);
  margin:18px 0;
}

/* =========================
   5) Footer (no overflow)
========================= */
footer{
  margin-top: 28px;
  border-top: 1px solid var(--line2);
  background: rgba(255,255,255,.55);
}

footer .container{
  padding: 18px 0 26px;
}

footer nav{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin-top:0;

  max-width: 100%;
  overflow-x: hidden;
}

footer a{
  color: rgba(15,23,42,.70);
  max-width: 100%;
}
footer a:hover{
  color: rgba(15,23,42,.92);
}

/* Long words/links won’t break layout */
header nav a,
footer a{
  overflow-wrap: anywhere;
  word-break: break-word;
}

/* =========================
   6) Mobile
========================= */
@media (max-width:560px){
  body{
    padding-top: calc(var(--header-h-m) + var(--gap-after-header-m));
  }

  header{ height: var(--header-h-m); }

  header .container{
    grid-template-rows: var(--header-top-row-m) 1fr;
  }

  .logo img{ height: var(--logo-h-m); }

  /* Language stays top-right */
  header nav .lang{
    top: 10px;
    right: 0;
  }

  /* Menu: one row + horizontal scroll inside header */
  header nav{
    padding-right: 86px; /* room under lang */
    gap: 8px;

    flex-wrap: nowrap;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    white-space: nowrap;
  }

  header nav::-webkit-scrollbar{ height:0; }
  header nav{ scrollbar-width:none; }

  header nav a, header nav strong{
    flex: 0 0 auto;
    padding: 6px 8px;
    font-size: 14px;
    border-radius: 10px;
  }

  main.container{
    padding: 18px 14px 20px;
  }
}

/* за замовчуванням — показуємо */
.desktop-only {
  display: inline;
}

/* мобільні */
@media (max-width: 767px) {
  .desktop-only {
    display: none;
  }
}

/* Smooth partials injection (no visual "jump") */
#site-header, #site-footer{
  opacity: 0;
  transition: opacity .12s ease;
}
#site-header.ready, #site-footer.ready{
  opacity: 1;
}