/* SpeedAmnezia Premium Dark SaaS Design */
:root {
  --bg-primary: #050816;
  --bg-secondary: #0a0f1f;
  --bg-card: rgba(15, 23, 42, 0.7);
  --bg-glass: rgba(15, 23, 42, 0.55);
  --cyan: #00E5FF;
  --cyan-dim: #00b8d4;
  --cyan-glow: rgba(0, 229, 255, 0.35);
  --purple: #7c3aed;
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border: rgba(0, 229, 255, 0.15);
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  overflow-x: hidden;
  min-height: 100vh;
}

/* Background effects */
body::before {
  content: '';
  position: fixed;
  inset: 0;
  background: 
    radial-gradient(ellipse 80% 50% at 20% -20%, rgba(0, 229, 255, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 100%, rgba(124, 58, 237, 0.1), transparent);
  pointer-events: none;
  z-index: -1;
}

a {
  color: var(--cyan);
  text-decoration: none;
  transition: color var(--transition);
}

a:hover {
  color: #67f0ff;
}

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

/* Typography */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
}

h1 { font-size: clamp(2rem, 5vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3.5vw, 2.4rem); margin-bottom: 1.25rem; }
h3 { font-size: clamp(1.25rem, 2.5vw, 1.6rem); margin-bottom: 0.75rem; }

p { margin-bottom: 1.1rem; color: var(--text-secondary); }

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header / Nav */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background: rgba(5, 8, 22, 0.85);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  transition: all var(--transition);
}

.header.scrolled {
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.logo {
  font-size: 1.45rem;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo span {
  background: linear-gradient(135deg, var(--cyan), #67f0ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 28px;
  list-style: none;
}

.nav-links a {
  color: var(--text-secondary);
  font-weight: 500;
  font-size: 0.95rem;
  position: relative;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--cyan);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--cyan);
  transition: width var(--transition);
}

.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-weight: 600;
  font-size: 0.95rem;
  border-radius: 50px;
  border: none;
  cursor: pointer;
  transition: all var(--transition);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background: linear-gradient(135deg, var(--cyan), #00b8d4);
  color: #050816;
  box-shadow: 0 4px 20px var(--cyan-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(0, 229, 255, 0.5);
  color: #050816;
}

.btn-outline {
  background: transparent;
  color: var(--cyan);
  border: 1.5px solid var(--cyan);
}

.btn-outline:hover {
  background: rgba(0, 229, 255, 0.1);
  color: #67f0ff;
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
}

/* Mobile menu */
.burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  background: none;
  border: none;
}

.burger span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--text-primary);
  transition: all var(--transition);
  border-radius: 2px;
}

.burger.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}
.burger.active span:nth-child(2) {
  opacity: 0;
}
.burger.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* Hero */
.hero {
  padding: 140px 0 80px;
  position: relative;
  overflow: hidden;
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 60px;
  align-items: center;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: rgba(0, 229, 255, 0.1);
  border: 1px solid var(--border);
  color: var(--cyan);
  padding: 6px 14px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 20px;
}

.hero h1 {
  margin-bottom: 20px;
  background: linear-gradient(135deg, #fff 30%, var(--cyan));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero-desc {
  font-size: 1.15rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 540px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 40px;
}

.hero-stats {
  display: flex;
  gap: 32px;
  flex-wrap: wrap;
}

.stat {
  text-align: left;
}

.stat-value {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--cyan);
  line-height: 1.2;
}

.stat-label {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.hero-visual {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}

.glass-card {
  background: var(--bg-glass);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.glass-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--cyan), transparent);
}

/* Pricing */
.section {
  padding: 90px 0;
}

.section-header {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 50px;
}

.section-header h2 {
  margin-bottom: 12px;
}

.section-header p {
  font-size: 1.1rem;
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 28px;
  max-width: 900px;
  margin: 0 auto;
}

.price-card {
  background: var(--bg-card);
  backdrop-filter: blur(16px);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 36px 28px;
  position: relative;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.price-card:hover {
  transform: translateY(-6px);
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 20px 50px rgba(0, 229, 255, 0.15);
}

.price-card.popular {
  border-color: var(--cyan);
  box-shadow: 0 0 40px rgba(0, 229, 255, 0.2);
}

.price-card.popular::after {
  content: 'Выгоднее';
  position: absolute;
  top: -12px;
  right: 24px;
  background: linear-gradient(135deg, var(--cyan), #00b8d4);
  color: #050816;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 4px 14px;
  border-radius: 50px;
}

.price-period {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.price-amount {
  font-size: 2.8rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  margin-bottom: 4px;
}

.price-amount span {
  font-size: 1.2rem;
  color: var(--text-muted);
  font-weight: 500;
}

.price-note {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.price-features {
  list-style: none;
  margin-bottom: 28px;
  flex-grow: 1;
}

.price-features li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.price-features li::before {
  content: '✓';
  color: var(--cyan);
  font-weight: 700;
  flex-shrink: 0;
}

/* Features */
.features-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 28px;
  transition: all var(--transition);
}

.feature-card:hover {
  border-color: rgba(0, 229, 255, 0.35);
  transform: translateY(-4px);
}

.feature-icon {
  width: 48px;
  height: 48px;
  background: rgba(0, 229, 255, 0.12);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 16px;
  color: var(--cyan);
}

/* Content / SEO blocks */
.content-block {
  max-width: 820px;
  margin: 0 auto;
}

.content-block h2 {
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-top: 0.5rem;
}

.content-block h3 {
  margin-top: 1.8rem;
  color: var(--cyan-dim);
}

.content-block ul, .content-block ol {
  margin: 1rem 0 1.5rem 1.5rem;
  color: var(--text-secondary);
}

.content-block li {
  margin-bottom: 0.5rem;
}

.content-block strong {
  color: var(--text-primary);
}

/* FAQ */
.faq-list {
  max-width: 800px;
  margin: 0 auto;
}

.faq-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 12px;
  overflow: hidden;
}

.faq-question {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 18px 22px;
  background: none;
  border: none;
  color: var(--text-primary);
  font-size: 1.05rem;
  font-weight: 600;
  cursor: pointer;
  text-align: left;
  transition: color var(--transition);
}

.faq-question:hover {
  color: var(--cyan);
}

.faq-question .icon {
  transition: transform var(--transition);
  color: var(--cyan);
  font-size: 1.2rem;
}

.faq-item.active .faq-question .icon {
  transform: rotate(45deg);
}

.faq-answer {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.4s ease;
}

.faq-answer-inner {
  padding: 0 22px 20px;
  color: var(--text-secondary);
}

/* Blog cards */
.blog-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 28px;
}

.blog-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  transition: all var(--transition);
  display: flex;
  flex-direction: column;
}

.blog-card:hover {
  transform: translateY(-5px);
  border-color: rgba(0, 229, 255, 0.4);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
}

.blog-card-body {
  padding: 24px;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.blog-card h3 {
  font-size: 1.2rem;
  margin-bottom: 10px;
}

.blog-card h3 a {
  color: var(--text-primary);
}

.blog-card h3 a:hover {
  color: var(--cyan);
}

.blog-meta {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 12px;
}

.blog-excerpt {
  flex-grow: 1;
  font-size: 0.95rem;
}

/* Article page */
.article-hero {
  padding: 130px 0 50px;
  text-align: center;
}

.article-meta {
  color: var(--text-muted);
  font-size: 0.95rem;
  margin-bottom: 16px;
}

.article-content {
  max-width: 780px;
  margin: 0 auto;
  padding: 0 20px 80px;
}

.article-content h2 {
  margin-top: 2.8rem;
  margin-bottom: 1rem;
  color: var(--text-primary);
}

.article-content h3 {
  margin-top: 1.8rem;
  color: var(--cyan-dim);
}

.article-content p {
  margin-bottom: 1.2rem;
}

.article-content ul, .article-content ol {
  margin: 1rem 0 1.5rem 1.4rem;
  color: var(--text-secondary);
}

.article-content li {
  margin-bottom: 0.55rem;
}

.article-content blockquote {
  border-left: 3px solid var(--cyan);
  padding: 12px 20px;
  margin: 1.5rem 0;
  background: rgba(0, 229, 255, 0.05);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  color: var(--text-secondary);
  font-style: italic;
}

.cta-box {
  background: linear-gradient(135deg, rgba(0, 229, 255, 0.1), rgba(124, 58, 237, 0.08));
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  margin: 40px 0;
}

.cta-box h3 {
  margin-bottom: 12px;
}

/* Footer */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 60px 0 30px;
  margin-top: 40px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 40px;
}

.footer-brand p {
  margin-top: 12px;
  font-size: 0.95rem;
  max-width: 280px;
}

.footer h4 {
  font-size: 1rem;
  margin-bottom: 16px;
  color: var(--text-primary);
}

.footer ul {
  list-style: none;
}

.footer ul li {
  margin-bottom: 10px;
}

.footer ul a {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.footer ul a:hover {
  color: var(--cyan);
}

.footer-bottom {
  border-top: 1px solid var(--border);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 12px;
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Reveal animations */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.7s ease, transform 0.7s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Utility */
.text-center { text-align: center; }
.mt-2 { margin-top: 0.5rem; }
.mt-4 { margin-top: 1.5rem; }
.mb-4 { margin-bottom: 1.5rem; }
.glow {
  text-shadow: 0 0 20px var(--cyan-glow);
}

/* Responsive */
@media (max-width: 900px) {
  .hero-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
  .hero-visual {
    order: -1;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .nav-links {
    position: fixed;
    top: 72px;
    left: 0;
    right: 0;
    background: rgba(5, 8, 22, 0.97);
    backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    transition: all 0.35s ease;
    pointer-events: none;
  }
  .nav-links.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }
  .burger {
    display: flex;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 120px 0 60px;
  }
  .hero-cta {
    flex-direction: column;
  }
  .hero-cta .btn {
    width: 100%;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .pricing-grid {
    grid-template-columns: 1fr;
  }
  .price-amount {
    font-size: 2.3rem;
  }
}

/* Table of contents style for long articles */
.toc {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin: 24px 0 32px;
}

.toc h4 {
  margin-bottom: 12px;
  font-size: 1rem;
}

.toc ul {
  list-style: none;
  margin: 0;
}

.toc li {
  margin-bottom: 6px;
}

.toc a {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.toc a:hover {
  color: var(--cyan);
}