/* ============================================================
   Kontenza — landing & legal pages
   Aesthetic: "Neon on Obsidian"
   Dark obsidian base + TikTok teal (#25F4EE) / pink-red (#FE2C55)
   Fonts: Clash Display (display) + Satoshi (body) via Fontshare
   ============================================================ */

/* ---------- Design tokens ---------- */
:root {
  /* Surfaces */
  --bg:            #060607;
  --bg-2:          #0b0b0d;
  --surface:       #121214;
  --surface-2:     #17171b;
  --surface-3:     #1d1d22;

  /* Lines */
  --border:        rgba(255, 255, 255, 0.08);
  --border-strong: rgba(255, 255, 255, 0.16);

  /* Text */
  --text:          #f4f5f7;
  --text-dim:      #a8aab0;
  --text-faint:    #6b6d74;

  /* TikTok accents */
  --teal:          #25f4ee;
  --pink:          #fe2c55;
  --teal-soft:     rgba(37, 244, 238, 0.14);
  --pink-soft:     rgba(254, 44, 85, 0.14);

  /* Gradients */
  --grad:          linear-gradient(120deg, var(--teal) 0%, var(--pink) 100%);
  --grad-soft:     linear-gradient(120deg, rgba(37,244,238,0.18), rgba(254,44,85,0.18));

  /* Geometry */
  --radius-sm:     12px;
  --radius:        18px;
  --radius-lg:     26px;
  --maxw:          1180px;
  --gutter:        clamp(20px, 5vw, 48px);

  /* Shadows */
  --shadow:        0 24px 60px -24px rgba(0, 0, 0, 0.8);
  --shadow-teal:   0 0 0 1px rgba(37,244,238,0.25), 0 18px 50px -18px rgba(37,244,238,0.35);

  /* Type */
  --font-display:  'Clash Display', 'Satoshi', system-ui, sans-serif;
  --font-body:     'Satoshi', system-ui, -apple-system, 'Segoe UI', sans-serif;

  --ease:          cubic-bezier(0.22, 1, 0.36, 1);
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
  position: relative;
}

/* Atmosphere: dual-accent radial glows + faint grain */
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -2;
  background:
    radial-gradient(60% 50% at 12% -5%, rgba(37,244,238,0.16), transparent 60%),
    radial-gradient(55% 45% at 95% 8%, rgba(254,44,85,0.14), transparent 60%),
    radial-gradient(45% 40% at 50% 110%, rgba(254,44,85,0.10), transparent 60%);
  pointer-events: none;
}
body::after {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  opacity: 0.035;
  pointer-events: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }

::selection { background: var(--pink); color: #fff; }

:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- Language toggle (pure CSS, both languages in DOM) ---------- */
html[data-lang="ru"] .lang-en { display: none !important; }
html[data-lang="en"] .lang-ru { display: none !important; }

/* ---------- Layout helpers ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(64px, 10vw, 130px); position: relative; }
.section--tight { padding-block: clamp(48px, 7vw, 90px); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-dim);
  margin-bottom: 20px;
}
.eyebrow::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--grad);
  box-shadow: 0 0 12px var(--teal);
}

.section-head { max-width: 720px; margin-bottom: clamp(36px, 5vw, 60px); }

h1, h2, h3 { font-family: var(--font-display); font-weight: 600; line-height: 1.04; letter-spacing: -0.02em; }

h1 { font-size: clamp(2.6rem, 7vw, 5.1rem); }
h2 { font-size: clamp(2rem, 4.5vw, 3.3rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.45rem); letter-spacing: -0.01em; }

.lead { font-size: clamp(1.05rem, 1.6vw, 1.3rem); color: var(--text-dim); max-width: 60ch; }

.grad-text {
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 15px 28px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 1rem;
  letter-spacing: -0.01em;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background 0.25s var(--ease);
  white-space: nowrap;
}
.btn svg { width: 18px; height: 18px; }
.btn--primary {
  position: relative;
  color: #05060a;
  background: var(--grad);
  box-shadow: 0 14px 40px -14px rgba(254,44,85,0.6);
}
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 22px 50px -16px rgba(37,244,238,0.55); }
.btn--ghost {
  color: var(--text);
  border: 1px solid var(--border-strong);
  background: rgba(255,255,255,0.02);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover { border-color: var(--teal); color: var(--teal); transform: translateY(-3px); }

/* ---------- Header ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease);
  border-bottom: 1px solid transparent;
}
.site-header.scrolled {
  background: rgba(8, 8, 10, 0.72);
  backdrop-filter: blur(16px) saturate(140%);
  border-bottom: 1px solid var(--border);
}
.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 76px;
  gap: 24px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; font-family: var(--font-display); font-weight: 600; font-size: 1.25rem; letter-spacing: -0.02em; }
.brand .logo-mark { width: 34px; height: 34px; flex: none; }

.nav-links { display: flex; align-items: center; gap: 32px; }
.nav-links a { color: var(--text-dim); font-weight: 500; font-size: 0.97rem; position: relative; transition: color 0.2s; }
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: ""; position: absolute; left: 0; bottom: -6px;
  width: 0; height: 2px; background: var(--grad); transition: width 0.28s var(--ease);
}
.nav-links a:hover::after { width: 100%; }

.nav-actions { display: flex; align-items: center; gap: 16px; }

/* Language switch */
.lang-switch { display: inline-flex; border: 1px solid var(--border); border-radius: 999px; overflow: hidden; }
.lang-switch button {
  padding: 7px 13px; font-size: 0.8rem; font-weight: 600; color: var(--text-faint);
  transition: color 0.2s, background 0.2s;
}
.lang-switch button.active { color: #05060a; background: var(--grad); }

/* Mobile nav */
.nav-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--border); border-radius: 12px; align-items: center; justify-content: center; }
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after {
  content: ""; display: block; width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: transform 0.3s var(--ease), opacity 0.2s;
}
.nav-toggle span::before { position: absolute; transform: translateY(-6px); }
.nav-toggle span::after  { position: absolute; transform: translateY(6px); }
.nav-toggle.open span { background: transparent; }
.nav-toggle.open span::before { transform: rotate(45deg); }
.nav-toggle.open span::after  { transform: rotate(-45deg); }

/* ---------- Hero ---------- */
.hero { position: relative; padding-block: clamp(70px, 13vw, 150px) clamp(60px, 9vw, 110px); }
.hero-grid {
  position: absolute; inset: 0; z-index: -1; pointer-events: none;
  background-image:
    linear-gradient(var(--border) 1px, transparent 1px),
    linear-gradient(90deg, var(--border) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(70% 60% at 50% 25%, #000 0%, transparent 80%);
  -webkit-mask-image: radial-gradient(70% 60% at 50% 25%, #000 0%, transparent 80%);
  opacity: 0.5;
}
.hero .eyebrow { opacity: 0; animation: fadeUp 0.7s var(--ease) 0.05s forwards; }
.hero h1 { max-width: 16ch; opacity: 0; animation: fadeUp 0.8s var(--ease) 0.15s forwards; }
.hero .lead { margin-top: 26px; opacity: 0; animation: fadeUp 0.8s var(--ease) 0.3s forwards; }
.hero-cta { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 38px; opacity: 0; animation: fadeUp 0.8s var(--ease) 0.45s forwards; }
.hero-meta { display: flex; flex-wrap: wrap; gap: 28px; margin-top: 52px; opacity: 0; animation: fadeUp 0.8s var(--ease) 0.6s forwards; }
.hero-meta .stat { }
.hero-meta .stat b { font-family: var(--font-display); font-size: 1.7rem; font-weight: 600; display: block; }
.hero-meta .stat span { font-size: 0.85rem; color: var(--text-faint); }

@keyframes fadeUp { from { opacity: 0; transform: translateY(22px); } to { opacity: 1; transform: none; } }

/* Gradient beam divider */
.beam { height: 1px; width: 100%; background: linear-gradient(90deg, transparent, var(--teal), var(--pink), transparent); opacity: 0.6; }

/* ---------- Cards / grids ---------- */
.grid { display: grid; gap: 20px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  position: relative;
  background: linear-gradient(180deg, var(--surface), var(--bg-2));
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 30px;
  transition: transform 0.35s var(--ease), border-color 0.35s var(--ease), box-shadow 0.35s var(--ease);
  overflow: hidden;
}
.card::after {
  content: ""; position: absolute; inset: 0; border-radius: inherit; padding: 1px;
  background: var(--grad); opacity: 0;
  -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
  -webkit-mask-composite: xor; mask-composite: exclude;
  transition: opacity 0.35s var(--ease);
}
.card:hover { transform: translateY(-6px); box-shadow: var(--shadow); }
.card:hover::after { opacity: 0.7; }

.card .icon {
  width: 52px; height: 52px; border-radius: 14px;
  display: grid; place-items: center; margin-bottom: 22px;
  background: var(--grad-soft); border: 1px solid var(--border);
}
.card .icon svg { width: 24px; height: 24px; stroke: var(--teal); }
.card h3 { margin-bottom: 10px; }
.card p { color: var(--text-dim); font-size: 0.98rem; }

/* Numbered steps */
.steps { counter-reset: step; }
.step { position: relative; padding-left: 0; }
.step .num {
  font-family: var(--font-display); font-size: 3rem; font-weight: 600;
  line-height: 1; background: var(--grad); -webkit-background-clip: text; background-clip: text; color: transparent;
  margin-bottom: 16px; display: block;
}
.step h3 { margin-bottom: 8px; }
.step p { color: var(--text-dim); font-size: 0.98rem; }

/* About / split */
.split { display: grid; grid-template-columns: 1.1fr 0.9fr; gap: clamp(32px, 5vw, 64px); align-items: center; }
.about-list { display: grid; gap: 16px; margin-top: 26px; }
.about-list li { display: flex; gap: 14px; align-items: flex-start; color: var(--text-dim); }
.about-list li::before {
  content: ""; flex: none; margin-top: 8px; width: 8px; height: 8px; border-radius: 50%;
  background: var(--grad); box-shadow: 0 0 10px var(--teal-soft);
}
.panel {
  background: linear-gradient(160deg, var(--surface-2), var(--bg-2));
  border: 1px solid var(--border); border-radius: var(--radius-lg); padding: clamp(24px, 4vw, 40px);
}

/* Security badges */
.badge-row { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 26px; }
.badge {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 10px 16px; border-radius: 999px; font-size: 0.86rem; font-weight: 500;
  border: 1px solid var(--border); background: rgba(255,255,255,0.02); color: var(--text-dim);
}
.badge svg { width: 16px; height: 16px; stroke: var(--teal); }

/* ---------- Final CTA ---------- */
.cta-final {
  position: relative;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: clamp(40px, 7vw, 80px);
  text-align: center;
  overflow: hidden;
  background: radial-gradient(120% 140% at 50% 0%, rgba(254,44,85,0.16), transparent 55%),
              radial-gradient(120% 140% at 50% 100%, rgba(37,244,238,0.16), transparent 55%),
              var(--bg-2);
}
.cta-final h2 { margin-bottom: 18px; }
.cta-final .lead { margin-inline: auto; margin-bottom: 32px; }
.cta-final .hero-cta { justify-content: center; }

/* ---------- Footer ---------- */
.site-footer { border-top: 1px solid var(--border); padding-block: 64px 36px; margin-top: 40px; }
.footer-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1.3fr; gap: 40px; }
.footer-col h4 { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--text-faint); margin-bottom: 18px; font-family: var(--font-body); font-weight: 600; }
.footer-col ul { display: grid; gap: 12px; }
.footer-col a, .footer-col p { color: var(--text-dim); font-size: 0.94rem; transition: color 0.2s; }
.footer-col a:hover { color: var(--teal); }
.footer-brand p { margin-top: 16px; max-width: 34ch; color: var(--text-faint); font-size: 0.92rem; }
.footer-legal {
  display: flex; flex-wrap: wrap; justify-content: space-between; gap: 16px;
  margin-top: 48px; padding-top: 28px; border-top: 1px solid var(--border);
  color: var(--text-faint); font-size: 0.85rem;
}
.footer-legal .reqs { max-width: 70ch; line-height: 1.7; }

/* ---------- Legal pages ---------- */
.legal-hero { padding-block: clamp(64px, 11vw, 120px) clamp(28px, 4vw, 48px); }
.legal-hero .updated { color: var(--text-faint); font-size: 0.9rem; margin-top: 14px; }
.legal-layout { display: grid; grid-template-columns: 240px 1fr; gap: clamp(32px, 5vw, 64px); align-items: start; padding-bottom: 100px; }
.legal-toc { position: sticky; top: 100px; }
.legal-toc h4 { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.14em; color: var(--text-faint); margin-bottom: 16px; }
.legal-toc ul { display: grid; gap: 10px; }
.legal-toc a { color: var(--text-dim); font-size: 0.9rem; line-height: 1.4; transition: color 0.2s; display: block; }
.legal-toc a:hover { color: var(--teal); }

.legal-body { max-width: 760px; }
.legal-body section { margin-bottom: 44px; scroll-margin-top: 100px; }
.legal-body h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); margin-bottom: 16px; }
.legal-body h3 { margin: 26px 0 10px; }
.legal-body p { color: var(--text-dim); margin-bottom: 14px; }
.legal-body ul.bul { display: grid; gap: 10px; margin: 4px 0 16px; }
.legal-body ul.bul li { display: flex; gap: 12px; color: var(--text-dim); }
.legal-body ul.bul li::before { content: ""; flex: none; margin-top: 9px; width: 7px; height: 7px; border-radius: 50%; background: var(--grad); }
.legal-body a.inline { color: var(--teal); text-decoration: underline; text-underline-offset: 3px; }
.legal-body .callout {
  border: 1px solid var(--border); border-left: 3px solid var(--teal);
  background: rgba(37,244,238,0.05); border-radius: 12px; padding: 18px 20px; margin: 18px 0;
}
.legal-body table.data { width: 100%; border-collapse: collapse; margin: 12px 0 18px; font-size: 0.92rem; }
.legal-body table.data th, .legal-body table.data td { text-align: left; padding: 12px 14px; border: 1px solid var(--border); vertical-align: top; }
.legal-body table.data th { background: var(--surface-2); color: var(--text); font-weight: 600; }
.legal-body table.data td { color: var(--text-dim); }

/* ---------- Scroll reveal ---------- */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in-view { opacity: 1; transform: none; }
.reveal[data-delay="1"] { transition-delay: 0.08s; }
.reveal[data-delay="2"] { transition-delay: 0.16s; }
.reveal[data-delay="3"] { transition-delay: 0.24s; }
.reveal[data-delay="4"] { transition-delay: 0.32s; }
.reveal[data-delay="5"] { transition-delay: 0.40s; }

/* ---------- Responsive ---------- */
@media (max-width: 940px) {
  .grid-3 { grid-template-columns: repeat(2, 1fr); }
  .split { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .legal-layout { grid-template-columns: 1fr; }
  .legal-toc { position: static; }
}

@media (max-width: 720px) {
  .nav-links, .nav-actions .btn { display: none; }
  .nav-toggle { display: flex; position: relative; }
  .nav-links {
    position: fixed; inset: 76px 0 auto 0; flex-direction: column; align-items: flex-start;
    gap: 4px; padding: 20px var(--gutter) 32px; background: rgba(8,8,10,0.96);
    backdrop-filter: blur(16px); border-bottom: 1px solid var(--border);
    transform: translateY(-120%); transition: transform 0.35s var(--ease); z-index: 90;
  }
  .nav-links.open { display: flex; transform: none; }
  .nav-links a { font-size: 1.15rem; padding: 10px 0; width: 100%; }
  .grid-3, .grid-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero-meta { gap: 20px; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; }
  .hero .eyebrow, .hero h1, .hero .lead, .hero-cta, .hero-meta { opacity: 1; animation: none; }
}