/* Crypto Ledger Security - Design system */
:root {
  --color1: #008eff;
  --color2: #ff5bff;
  --color3: #ff8dcd;
  --color4: #fff0b8;
  --color5: #ffffcf;
  --dark: #0d0d14;
  --darker: #06060a;
  --text: #e8e8f0;
  --text-muted: #a0a0b8;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(0,142,255,0.12);
  --shadow2: 0 8px 32px rgba(255,91,255,0.1);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--darker);
  min-height: 100vh;
}

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

a {
  color: var(--color1);
  text-decoration: none;
}

a:hover {
  color: var(--color3);
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6,6,10,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color5);
}

.nav-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--text-muted);
  padding: 0.4rem 0.6rem;
  border-radius: var(--radius);
}

.nav-menu a:hover {
  color: var(--color1);
  background: rgba(0,142,255,0.1);
}

.lang-switcher {
  display: flex;
  gap: 0.5rem;
}

.lang-switcher a {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  color: var(--text-muted);
  font-size: 0.9rem;
}

.lang-switcher a:hover,
.lang-switcher a.active {
  color: var(--color1);
  background: rgba(0,142,255,0.15);
}

/* Main content */
main {
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}

/* Blocks */
.hero-block {
  padding: 2.5rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

.hero-block h1 {
  font-size: clamp(1.75rem, 4vw, 2.25rem);
  line-height: 1.25;
  margin: 0 0 1rem;
  color: var(--color5);
  font-weight: 700;
}

.hero-block .lead {
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 720px;
}

.section-block {
  padding: 2rem 0;
}

.section-block h2 {
  font-size: 1.5rem;
  margin: 0 0 1rem;
  color: var(--color4);
  font-weight: 600;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid rgba(255,240,184,0.2);
}

.section-block h3 {
  font-size: 1.2rem;
  margin: 1.5rem 0 0.75rem;
  color: var(--color3);
  font-weight: 600;
}

.content-block {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.06);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.75rem;
  margin: 1.25rem 0;
}

.content-block.color1 { border-left: 4px solid var(--color1); }
.content-block.color2 { border-left: 4px solid var(--color2); }
.content-block.color3 { border-left: 4px solid var(--color3); }

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
  margin: 1rem 0;
}

.card {
  background: rgba(255,255,255,0.04);
  border-radius: var(--radius);
  padding: 1.25rem;
  border: 1px solid rgba(255,255,255,0.06);
}

.card strong {
  color: var(--color1);
}

/* Images */
.content-img-wrap {
  margin: 1.5rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 560px;
  box-shadow: var(--shadow);
}

.content-img-wrap img {
  width: 100%;
  height: auto;
  vertical-align: middle;
  loading: lazy;
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
  border-radius: var(--radius);
  border: 1px solid rgba(255,255,255,0.08);
}

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.95rem;
}

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(255,255,255,0.06);
}

th {
  background: rgba(0,142,255,0.12);
  color: var(--color4);
  font-weight: 600;
}

tr:hover td {
  background: rgba(255,255,255,0.02);
}

/* FAQ */
.faq-block {
  padding: 2rem 0;
}

.faq-block h2 {
  margin-bottom: 1.25rem;
}

.faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.faq-item {
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
  overflow: hidden;
  background: rgba(255,255,255,0.02);
}

.faq-q {
  width: 100%;
  padding: 1rem 1.25rem;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.faq-q:hover {
  background: rgba(255,255,255,0.04);
  color: var(--color3);
}

.faq-q::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color1);
  flex-shrink: 0;
  transition: transform 0.25s ease;
}

.faq-item.is-open .faq-q::after {
  transform: rotate(45deg);
}

.faq-a {
  padding: 0 1.25rem 1rem;
  display: none;
}

.faq-item.is-open .faq-a {
  display: block;
}

.faq-a-inner {
  padding-top: 0.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Footer */
.site-footer {
  background: rgba(0,0,0,0.35);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 2.5rem 1.5rem;
  margin-top: 3rem;
}

.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
}

.footer-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
  list-style: none;
  margin: 0 0 1.5rem;
  padding: 0;
}

.footer-menu a {
  color: var(--text-muted);
  font-size: 0.95rem;
}

.footer-menu a:hover {
  color: var(--color1);
}

.footer-copy {
  font-size: 0.875rem;
  color: var(--text-muted);
  opacity: 0.85;
}

/* Utility */
.color1 { color: var(--color1); }
.color2 { color: var(--color2); }
.color3 { color: var(--color3); }
.color4 { color: var(--color4); }
.color5 { color: var(--color5); }

/* Internal links in content */
.content-links {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: rgba(0,142,255,0.08);
  border-radius: var(--radius);
  border-left: 4px solid var(--color1);
}

.content-links p {
  margin: 0;
  font-size: 0.95rem;
}

/* Responsive */
@media (max-width: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-menu {
    width: 100%;
  }

  main {
    padding: 1.5rem 1rem 3rem;
  }

  .hero-block {
    padding: 1.5rem 0;
  }

  .section-block {
    padding: 1.25rem 0;
  }

  th, td {
    padding: 0.5rem 0.75rem;
    font-size: 0.875rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 16px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }
}