:root {
  /* Фон и поверхности — глубокие темные оттенки */
  --bg: #080a10;
  --bg-card: #121620;
  --bg-surf: #1a1f2e;
  --bg-surf2: #242b3d;

  /* Акценты — фирменный Celsius Blue */
  --accent: #0090ff;
  --accent2: #33a6ff;

  /* Вспомогательные цвета */
  --accent-red: #ff4d4d;
  --neon: #00d4ff;
  --success: #00e676;

  /* Текст */
  --text: #ffffff;
  --text2: #8a96ab;

  /* Декор */
  --border: rgba(255, 255, 255, 0.08);
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.5);

  /* Layout */
  --container: 1180px;
  --radius: 14px;
  --radius-sm: 8px;
}

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

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Arial, sans-serif;
  background:
    radial-gradient(900px 600px at 88% -10%, rgba(0, 144, 255, 0.18), transparent 60%),
    radial-gradient(700px 500px at -10% 30%, rgba(0, 212, 255, 0.10), transparent 65%),
    var(--bg);
  color: var(--text);
  line-height: 1.65;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
}

img { max-width: 100%; height: auto; display: block; }

a {
  color: var(--accent2);
  text-decoration: none;
  transition: color 0.2s ease;
}
a:hover { color: var(--neon); text-decoration: underline; }

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

/* ====================== AGE BAR ====================== */
.age-bar {
  background: linear-gradient(90deg, rgba(255, 77, 77, 0.16), rgba(255, 77, 77, 0.06));
  border-bottom: 1px solid rgba(255, 77, 77, 0.25);
  font-size: 13px;
  text-align: center;
  padding: 8px 12px;
  color: #ffd5d5;
  letter-spacing: 0.3px;
}
.age-bar strong { color: var(--accent-red); font-weight: 700; }

/* ====================== HEADER ====================== */
.site-header {
  background: rgba(10, 13, 22, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 0;
  gap: 20px;
}
.logo-link { display: inline-flex; align-items: center; }
.logo-img { height: 40px; width: auto; }

.nav { display: flex; gap: 6px; align-items: center; flex-wrap: wrap; }
.nav a {
  color: var(--text);
  font-size: 14px;
  font-weight: 500;
  padding: 8px 12px;
  border-radius: 8px;
  transition: all 0.2s ease;
}
.nav a:hover { background: var(--bg-surf2); color: var(--accent2); text-decoration: none; }
.nav a.active { color: var(--accent2); background: rgba(0, 144, 255, 0.10); }

.header-cta {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 18px;
  background: linear-gradient(135deg, var(--accent), var(--neon));
  color: #001428 !important;
  font-weight: 700;
  border-radius: 10px;
  font-size: 14px;
  white-space: nowrap;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  box-shadow: 0 4px 14px rgba(0, 144, 255, 0.35);
}
.header-cta:hover { transform: translateY(-1px); box-shadow: 0 6px 20px rgba(0, 212, 255, 0.55); text-decoration: none; }

.burger {
  display: none;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  padding: 8px 10px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 18px;
  line-height: 1;
}

/* ====================== HERO ====================== */
.hero {
  padding: 56px 0 40px;
  position: relative;
  overflow: hidden;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.15fr 1fr;
  gap: 50px;
  align-items: center;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 44px);
  line-height: 1.18;
  margin: 0 0 18px;
  letter-spacing: -0.5px;
  font-weight: 800;
}
.hero h1 span { background: linear-gradient(120deg, var(--accent), var(--neon)); -webkit-background-clip: text; background-clip: text; color: transparent; }

.hero-lead { color: #cdd5e3; font-size: 17px; margin-bottom: 26px; max-width: 540px; }

.hero-badges { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 26px; }
.badge {
  display: inline-flex; align-items: center; gap: 8px;
  background: var(--bg-surf);
  border: 1px solid var(--border);
  padding: 8px 14px;
  border-radius: 30px;
  font-size: 13px;
  color: var(--text);
  font-weight: 500;
}
.badge::before {
  content: "";
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 8px var(--success);
}

.hero-actions { display: flex; gap: 12px; flex-wrap: wrap; }

.btn-primary, .btn-secondary {
  display: inline-flex; align-items: center; justify-content: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: 12px;
  font-weight: 700;
  font-size: 15px;
  border: none;
  cursor: pointer;
  transition: all 0.25s ease;
  text-decoration: none;
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--neon));
  color: #001428;
  box-shadow: 0 6px 22px rgba(0, 144, 255, 0.45);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 30px rgba(0, 212, 255, 0.6); text-decoration: none; color: #001428; }

.btn-secondary {
  background: var(--bg-surf2);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { background: var(--bg-surf); border-color: var(--accent); color: var(--accent2); text-decoration: none; }

.hero-img-wrap {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow), 0 0 80px rgba(0, 144, 255, 0.18);
}
.hero-img-wrap img { display: block; width: 100%; height: auto; }
.hero-img-wrap::after {
  content: "";
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(8, 10, 16, 0.55) 100%);
  pointer-events: none;
}

/* ====================== SECTIONS / TYPOGRAPHY ====================== */
.section { padding: 56px 0; }
.section-tight { padding: 36px 0; }

h2 {
  font-size: clamp(24px, 2.5vw, 32px);
  margin: 0 0 18px;
  font-weight: 800;
  letter-spacing: -0.3px;
  line-height: 1.25;
}
h3 {
  font-size: 20px;
  margin: 28px 0 12px;
  font-weight: 700;
  color: var(--text);
  line-height: 1.3;
}
p { margin: 0 0 14px; color: #d3dae8; }
strong { color: #fff; }

ul, ol { padding-left: 22px; margin: 0 0 18px; }
li { margin-bottom: 8px; color: #d3dae8; }
li::marker { color: var(--accent2); }

/* Highlight Box */
.callout {
  background: linear-gradient(135deg, rgba(0, 144, 255, 0.10), rgba(0, 212, 255, 0.05));
  border: 1px solid rgba(0, 144, 255, 0.30);
  border-left: 4px solid var(--accent);
  padding: 20px 24px;
  border-radius: var(--radius);
  margin: 24px 0;
}
.callout p:last-child { margin-bottom: 0; }
.callout-title {
  display: flex; align-items: center; gap: 10px;
  font-weight: 700; color: var(--neon); margin-bottom: 10px; font-size: 16px;
}

/* Cards grid */
.cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 24px 0;
}
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  transition: all 0.3s ease;
  position: relative;
}
.card:hover {
  border-color: rgba(0, 144, 255, 0.45);
  transform: translateY(-3px);
  box-shadow: 0 12px 32px rgba(0, 144, 255, 0.18);
}
.card-icon {
  width: 44px; height: 44px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 12px;
  background: linear-gradient(135deg, rgba(0, 144, 255, 0.18), rgba(0, 212, 255, 0.10));
  color: var(--neon);
  font-size: 22px;
  margin-bottom: 14px;
  font-weight: 700;
}
.card h3 { margin: 0 0 10px; font-size: 17px; }
.card p { font-size: 14.5px; margin: 0; color: var(--text2); line-height: 1.55; }

/* Tables */
.table-wrap { overflow-x: auto; border-radius: var(--radius); border: 1px solid var(--border); margin: 22px 0; background: var(--bg-card); }
table { width: 100%; border-collapse: collapse; font-size: 14.5px; }
table th, table td { padding: 14px 18px; text-align: left; border-bottom: 1px solid var(--border); }
table th {
  background: var(--bg-surf);
  color: var(--accent2);
  font-weight: 600;
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}
table tr:last-child td { border-bottom: none; }
table tr:hover td { background: rgba(0, 144, 255, 0.04); }

/* FAQ */
.faq { margin: 28px 0; }
.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
  transition: border-color 0.2s ease;
}
.faq-item[open] { border-color: rgba(0, 144, 255, 0.35); }
.faq-item summary {
  padding: 16px 20px;
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  position: relative;
  padding-right: 50px;
  color: var(--text);
  font-size: 15.5px;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: "+";
  position: absolute; right: 18px; top: 50%; transform: translateY(-50%);
  font-size: 22px; color: var(--accent2); font-weight: 400;
  transition: transform 0.25s ease;
}
.faq-item[open] summary::after { content: "−"; }
.faq-item .faq-body { padding: 0 20px 18px; color: var(--text2); }
.faq-item .faq-body p:last-child { margin-bottom: 0; }

/* CTA block */
.cta-block {
  background:
    radial-gradient(600px 300px at 80% 50%, rgba(0, 212, 255, 0.18), transparent 70%),
    linear-gradient(135deg, var(--bg-surf), var(--bg-card));
  border: 1px solid rgba(0, 144, 255, 0.30);
  border-radius: 18px;
  padding: 44px 36px;
  text-align: center;
  margin: 36px 0;
  position: relative;
  overflow: hidden;
}
.cta-block h2 { margin-top: 0; }
.cta-block p { color: #cdd5e3; max-width: 640px; margin: 0 auto 24px; font-size: 16px; }

/* Breadcrumb */
.breadcrumbs {
  font-size: 13px;
  color: var(--text2);
  padding: 18px 0 0;
}
.breadcrumbs a { color: var(--text2); }
.breadcrumbs a:hover { color: var(--accent2); }
.breadcrumbs .sep { margin: 0 8px; opacity: 0.5; }

/* Page header */
.page-header {
  padding: 40px 0 24px;
}
.page-header h1 {
  font-size: clamp(28px, 3.5vw, 40px);
  margin: 12px 0 14px;
  font-weight: 800;
  letter-spacing: -0.4px;
  line-height: 1.2;
}
.page-header .lead { color: #cdd5e3; font-size: 17px; max-width: 760px; }
.page-img {
  margin: 24px 0 8px;
  border-radius: 16px;
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}

/* Article content layout */
.article-content {
  display: grid;
  grid-template-columns: 1fr 280px;
  gap: 50px;
  margin: 30px 0;
}
.article-body { min-width: 0; }
.sidebar {
  position: sticky;
  top: 90px;
  align-self: start;
}
.sidebar-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 18px;
}
.sidebar-card h4 {
  margin: 0 0 14px;
  font-size: 15px;
  color: var(--accent2);
  text-transform: uppercase;
  letter-spacing: 0.6px;
}
.sidebar-card ul { padding-left: 18px; margin: 0; }
.sidebar-card li { font-size: 14px; margin-bottom: 6px; }
.sidebar-cta { text-align: center; }
.sidebar-cta .btn-primary { width: 100%; padding: 12px; }

/* Stats row */
.stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 24px 0;
}
.stat {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 18px;
  text-align: center;
}
.stat-num {
  font-size: 26px;
  font-weight: 800;
  color: var(--neon);
  line-height: 1.1;
  margin-bottom: 4px;
}
.stat-label { font-size: 12.5px; color: var(--text2); text-transform: uppercase; letter-spacing: 0.5px; }

/* Pros / Cons */
.pros-cons {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 18px;
  margin: 24px 0;
}
.pros, .cons {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
}
.pros { border-left: 4px solid var(--success); }
.cons { border-left: 4px solid var(--accent-red); }
.pros h4, .cons h4 { margin: 0 0 12px; font-size: 16px; }
.pros h4 { color: var(--success); }
.cons h4 { color: var(--accent-red); }
.pros ul, .cons ul { padding-left: 20px; margin: 0; }
.pros li, .cons li { font-size: 14.5px; }

/* ====================== FOOTER ====================== */
.site-footer {
  background: #05070b;
  border-top: 1px solid var(--border);
  padding: 44px 0 24px;
  margin-top: 60px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1fr;
  gap: 36px;
  margin-bottom: 30px;
}
.footer-col h5 {
  margin: 0 0 14px;
  color: var(--accent2);
  font-size: 13px;
  text-transform: uppercase;
  letter-spacing: 0.7px;
}
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col li { margin-bottom: 8px; font-size: 14px; }
.footer-col a { color: var(--text2); }
.footer-col a:hover { color: var(--accent2); }
.footer-col p { font-size: 14px; color: var(--text2); }
.footer-logo { margin-bottom: 14px; }
.footer-logo img { height: 36px; width: auto; }

.footer-icons {
  display: flex;
  gap: 10px;
  margin-top: 12px;
  flex-wrap: wrap;
}
.footer-icons span {
  background: var(--bg-surf);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 6px 12px;
  font-size: 12px;
  color: var(--text2);
  font-weight: 600;
  letter-spacing: 0.5px;
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 20px;
  font-size: 12.5px;
  color: var(--text2);
  text-align: center;
  line-height: 1.7;
}
.footer-bottom .disc { max-width: 900px; margin: 0 auto 10px; }

/* ====================== RESPONSIVE ====================== */
@media (max-width: 980px) {
  .hero-grid { grid-template-columns: 1fr; gap: 36px; }
  .hero { padding-top: 40px; }
  .cards { grid-template-columns: repeat(2, 1fr); }
  .article-content { grid-template-columns: 1fr; }
  .sidebar { position: static; }
  .stats-row { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .pros-cons { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .burger { display: inline-flex; }
  .nav {
    position: absolute;
    top: 100%;
    left: 0; right: 0;
    background: var(--bg-surf);
    border-top: 1px solid var(--border);
    border-bottom: 1px solid var(--border);
    padding: 12px 20px;
    flex-direction: column;
    align-items: stretch;
    display: none;
    gap: 2px;
  }
  .nav.open { display: flex; }
  .nav a { padding: 12px 14px; border-radius: 8px; }
  .header-cta { font-size: 13px; padding: 8px 14px; }
  .section { padding: 40px 0; }
  .cta-block { padding: 32px 22px; }
  table th, table td { padding: 10px 12px; font-size: 13.5px; }
}

@media (max-width: 520px) {
  .cards { grid-template-columns: 1fr; }
  .stats-row { grid-template-columns: 1fr 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 28px; }
  .header-inner { gap: 8px; }
}