/* ============================================================
   ARB VPN — landing
   Тёмная security-тема, зелёный акцент. Без внешних шрифтов/CDN.
   Mobile-first.
   ============================================================ */

/* ░░ Tokens ░░ */
:root {
  /* Фон: глубокий navy → почти чёрный */
  --bg:          #070b12;
  --bg-soft:     #0c1420;
  --bg-card:     #101a28;
  --bg-card-hi:  #142235;
  --line:        rgba(120, 160, 200, 0.12);
  --line-hi:     rgba(120, 200, 150, 0.28);

  /* Текст */
  --fg:          #eaf1f8;
  --fg-soft:     #9fb0c3;
  --fg-mute:     #6b7d92;

  /* Акцент — зелёный щита логотипа (сэмпл: RGB 15,138,97 ≈ #0F8A61) */
  --accent:      #0f8a61;
  --accent-hi:   #2bc885;
  --accent-glow: rgba(15, 138, 97, 0.45);

  /* Прочее */
  --radius:      18px;
  --radius-sm:   12px;
  --maxw:        1120px;
  --ease:        cubic-bezier(0.22, 1, 0.36, 1);

  --font-body: "Segoe UI", "Inter", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-display: "Segoe UI Semibold", "Segoe UI", system-ui, -apple-system, sans-serif;
}

/* ░░ 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(--fg);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

::selection { background: var(--accent); color: #04130a; }

/* ░░ Атмосферный фон ░░ */
.bg-atmosphere {
  position: fixed;
  inset: 0;
  z-index: -1;
  overflow: hidden;
  background:
    radial-gradient(1200px 700px at 50% -10%, #0e1c2c 0%, transparent 60%),
    var(--bg);
}
.bg-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(90px);
  opacity: 0.5;
}
.bg-glow--1 {
  width: 520px; height: 520px;
  top: -120px; left: -100px;
  background: radial-gradient(circle, var(--accent-glow), transparent 70%);
}
.bg-glow--2 {
  width: 420px; height: 420px;
  top: 360px; right: -120px;
  background: radial-gradient(circle, rgba(40, 90, 160, 0.4), transparent 70%);
}
/* Тонкая сетка-текстура */
.bg-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--line) 1px, transparent 1px),
    linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
  -webkit-mask-image: radial-gradient(circle at 50% 30%, #000 0%, transparent 75%);
  opacity: 0.5;
}

/* ░░ Layout ░░ */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 22px;
}
.container--narrow { max-width: 760px; }

.section { padding: 86px 0; }
.section__title {
  font-family: var(--font-display);
  font-size: clamp(1.7rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.02em;
  text-align: center;
}
.section__lead {
  text-align: center;
  color: var(--fg-soft);
  margin-top: 14px;
  font-size: 1.1rem;
}

/* ░░ Buttons ░░ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1;
  padding: 14px 24px;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.18s var(--ease), box-shadow 0.25s var(--ease), background 0.2s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px) scale(0.99); }

.btn--primary {
  background: linear-gradient(135deg, var(--accent-hi), var(--accent));
  color: #04130a;
  box-shadow: 0 8px 24px -6px var(--accent-glow), inset 0 1px 0 rgba(255,255,255,0.25);
}
.btn--primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 34px -8px var(--accent-glow), inset 0 1px 0 rgba(255,255,255,0.3);
}
.btn--ghost {
  background: rgba(255,255,255,0.03);
  border-color: var(--line-hi);
  color: var(--fg);
}
.btn--ghost:hover {
  background: rgba(46, 158, 91, 0.1);
  border-color: var(--accent);
  transform: translateY(-2px);
}
.btn--lg { padding: 17px 34px; font-size: 1.08rem; }
.btn--sm { padding: 10px 18px; font-size: 0.92rem; }
.btn--block { width: 100%; }
.btn__icon { flex: none; }

/* ░░ Header ░░ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 22px;
  max-width: var(--maxw);
  margin: 0 auto;
  backdrop-filter: blur(10px);
}
/* Подложка хедера на скролле */
.site-header::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(7, 11, 18, 0.6);
  border-bottom: 1px solid var(--line);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: -1;
}
.site-header.is-scrolled::before { opacity: 1; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.2rem;
  letter-spacing: -0.01em;
}
.brand__logo { width: 36px; height: 36px; object-fit: contain; }
.brand__accent { color: var(--accent-hi); }

/* ░░ Hero ░░ */
.hero {
  position: relative;
  padding: 64px 22px 78px;
  text-align: center;
}
.hero__inner {
  max-width: 800px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 0.86rem;
  font-weight: 600;
  color: var(--fg-soft);
  background: rgba(46, 158, 91, 0.08);
  border: 1px solid var(--line-hi);
  padding: 7px 16px;
  border-radius: 999px;
  letter-spacing: 0.01em;
}
.eyebrow__dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--accent-hi);
  box-shadow: 0 0 0 0 var(--accent-glow);
  animation: pulse 2.2s infinite;
}
@keyframes pulse {
  0%   { box-shadow: 0 0 0 0 var(--accent-glow); }
  70%  { box-shadow: 0 0 0 9px rgba(46,158,91,0); }
  100% { box-shadow: 0 0 0 0 rgba(46,158,91,0); }
}

.hero__title {
  font-family: var(--font-display);
  font-size: clamp(2.4rem, 9vw, 4.6rem);
  font-weight: 700;
  line-height: 1.04;
  letter-spacing: -0.035em;
  margin-top: 26px;
}
.hero__title-accent {
  background: linear-gradient(120deg, var(--accent-hi) 10%, #8fe9b1 60%, var(--accent-hi));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: var(--accent-hi);
}
.hero__subtitle {
  font-size: clamp(1.08rem, 3.4vw, 1.42rem);
  color: var(--fg-soft);
  margin-top: 22px;
  max-width: 600px;
}
.hero__actions {
  margin-top: 38px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.hero__note {
  font-size: 0.94rem;
  color: var(--fg-mute);
  letter-spacing: 0.01em;
}
.hero__chips {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-top: 42px;
}
.chip {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--fg);
  background: var(--bg-card);
  border: 1px solid var(--line);
  padding: 8px 16px;
  border-radius: 999px;
}
.chip--muted { color: var(--fg-mute); background: transparent; }

/* ░░ Cards (преимущества) ░░ */
.cards {
  margin-top: 50px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
.card {
  position: relative;
  background: linear-gradient(180deg, var(--bg-card-hi), var(--bg-card));
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 28px 26px;
  transition: transform 0.25s var(--ease), border-color 0.25s, box-shadow 0.25s;
  overflow: hidden;
}
.card::after {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
  opacity: 0;
  transition: opacity 0.3s;
}
.card:hover {
  transform: translateY(-5px);
  border-color: var(--line-hi);
  box-shadow: 0 20px 40px -20px rgba(0,0,0,0.7);
}
.card:hover::after { opacity: 1; }
.card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 52px; height: 52px;
  border-radius: 14px;
  background: rgba(46, 158, 91, 0.12);
  color: var(--accent-hi);
  margin-bottom: 18px;
}
.card__title {
  font-family: var(--font-display);
  font-size: 1.22rem;
  font-weight: 700;
  letter-spacing: -0.01em;
}
.card__text {
  color: var(--fg-soft);
  margin-top: 10px;
  font-size: 1rem;
}

/* ░░ Pricing ░░ */
.section--pricing { position: relative; }
.pricing {
  margin-top: 48px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  max-width: 880px;
  margin-left: auto;
  margin-right: auto;
}
.price-card {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
}
.price-card--featured {
  background:
    radial-gradient(140% 90% at 50% 0%, rgba(46,158,91,0.16), transparent 60%),
    var(--bg-card-hi);
  border: 1.5px solid var(--accent);
  box-shadow: 0 24px 60px -28px var(--accent-glow);
}
.price-card__badge {
  align-self: flex-start;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: #04130a;
  background: linear-gradient(135deg, var(--accent-hi), var(--accent));
  padding: 5px 13px;
  border-radius: 999px;
}
.price-card__badge--muted {
  color: var(--fg-soft);
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--line);
}
.price-card__name {
  font-family: var(--font-display);
  font-size: 1.4rem;
  font-weight: 700;
  margin-top: 18px;
  letter-spacing: -0.01em;
}
.price-card__amount {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: 8px;
}
.price-card__big {
  font-family: var(--font-display);
  font-size: 3.1rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
}
.price-card--featured .price-card__big { color: var(--accent-hi); }
.price-card__per { color: var(--fg-mute); font-size: 1.05rem; }
.price-card__hint {
  color: var(--fg-soft);
  margin-top: 10px;
  font-size: 0.98rem;
}
.price-card__list {
  list-style: none;
  margin: 22px 0 26px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.price-card__list li {
  position: relative;
  padding-left: 30px;
  color: var(--fg-soft);
  font-size: 0.98rem;
}
.price-card__list li::before {
  content: "";
  position: absolute;
  left: 0; top: 3px;
  width: 18px; height: 18px;
  border-radius: 50%;
  background: rgba(46,158,91,0.15);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' width='12' height='12'%3E%3Cpath fill='%232bc885' d='M9 16.17L4.83 12l-1.42 1.41L9 19 21 7l-1.41-1.41z'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}
.price-card .btn { margin-top: auto; }

/* ░░ Steps ░░ */
.steps {
  list-style: none;
  margin-top: 50px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  counter-reset: step;
}
.step {
  position: relative;
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 30px 26px 26px;
}
.step__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px; height: 44px;
  border-radius: 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--accent-hi);
  background: rgba(46,158,91,0.12);
  border: 1px solid var(--line-hi);
  margin-bottom: 16px;
}
.step__title {
  font-family: var(--font-display);
  font-size: 1.2rem;
  font-weight: 700;
}
.step__text { color: var(--fg-soft); margin-top: 8px; }
.step__text a { color: var(--accent-hi); text-decoration: underline; text-underline-offset: 3px; }
.how__cta { text-align: center; margin-top: 44px; }

/* ░░ FAQ ░░ */
.section--faq { padding-bottom: 70px; }
.faq { margin-top: 42px; display: flex; flex-direction: column; gap: 12px; }
.faq__item {
  background: var(--bg-card);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  overflow: hidden;
  transition: border-color 0.25s;
}
.faq__item[open] { border-color: var(--line-hi); }
.faq__q {
  list-style: none;
  cursor: pointer;
  padding: 20px 56px 20px 22px;
  position: relative;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.06rem;
  user-select: none;
}
.faq__q::-webkit-details-marker { display: none; }
.faq__q::after {
  content: "";
  position: absolute;
  right: 22px; top: 50%;
  width: 12px; height: 12px;
  margin-top: -6px;
  border-right: 2px solid var(--accent-hi);
  border-bottom: 2px solid var(--accent-hi);
  transform: rotate(45deg);
  transition: transform 0.25s var(--ease);
}
.faq__item[open] .faq__q::after { transform: rotate(-135deg); }
.faq__a { padding: 0 22px 22px; color: var(--fg-soft); }
.faq__a a { color: var(--accent-hi); text-decoration: underline; text-underline-offset: 3px; }

/* ░░ Final CTA ░░ */
.final-cta { padding: 30px 0 90px; }
.final-cta__box {
  position: relative;
  text-align: center;
  background:
    radial-gradient(120% 120% at 50% 0%, rgba(46,158,91,0.18), transparent 60%),
    var(--bg-card-hi);
  border: 1px solid var(--line-hi);
  border-radius: 26px;
  padding: 56px 28px;
  overflow: hidden;
}
.final-cta__title {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 5.5vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.final-cta__text {
  color: var(--fg-soft);
  margin: 16px auto 30px;
  max-width: 480px;
  font-size: 1.1rem;
}

/* ░░ Footer ░░ */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 40px 0 48px;
  background: var(--bg-soft);
}
.footer__grid {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 22px;
  text-align: center;
}
.footer__brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
}
.footer__logo { width: 32px; height: 32px; object-fit: contain; }
.footer__links {
  display: flex;
  flex-direction: column;
  gap: 12px;
}
.footer__links a {
  color: var(--fg-soft);
  font-size: 0.98rem;
  transition: color 0.2s;
}
.footer__links a:hover { color: var(--accent-hi); }
.footer__copy { color: var(--fg-mute); font-size: 0.9rem; }

/* ░░ Reveal-анимации ░░ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
  will-change: opacity, transform;
}
.reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ░░ Tablet ░░ */
@media (min-width: 680px) {
  .cards { grid-template-columns: 1fr 1fr; }
  .steps { grid-template-columns: repeat(3, 1fr); }
  .footer__grid {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
  .footer__links { flex-direction: row; gap: 24px; }
}

/* ░░ Desktop ░░ */
@media (min-width: 920px) {
  .section { padding: 110px 0; }
  .cards { grid-template-columns: repeat(4, 1fr); gap: 20px; }
  .pricing { grid-template-columns: 1fr 1fr; }
  .br-desktop { display: inline; }
}
@media (max-width: 919px) {
  .br-desktop { display: none; }
}

/* ░░ Маленькие телефоны ░░ */
@media (max-width: 360px) {
  body { font-size: 16px; }
  .container, .hero, .site-header { padding-left: 16px; padding-right: 16px; }
  .btn--lg { padding: 15px 24px; }
  .header__cta { display: none; }
}

/* ░░ Доступность: уважать reduce-motion ░░ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .eyebrow__dot { animation: none; }
  * { transition-duration: 0.01ms !important; }
}

/* Фокус для клавиатуры */
a:focus-visible, .btn:focus-visible, summary:focus-visible {
  outline: 2px solid var(--accent-hi);
  outline-offset: 3px;
  border-radius: 6px;
}