/* Crypto Ledger Security - Design system */
:root {
  --color1: #11253a;
  --color2: #0d4e71;
  --color3: #0988b2;
  --color4: #03d1f9;
  --color5: #0ffff8;
  --text: #1a1a2e;
  --text-muted: #4a5568;
  --bg: #f8fafc;
  --white: #ffffff;
  --radius: 12px;
  --shadow: 0 4px 20px rgba(17, 37, 58, 0.08);
  --shadow-lg: 0 12px 40px rgba(17, 37, 58, 0.12);
  --font-min: 16px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: var(--font-min);
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color3);
  text-decoration: none;
}

a:hover {
  color: var(--color2);
  text-decoration: underline;
}

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--color1) 0%, var(--color2) 100%);
  color: var(--white);
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

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

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--white);
}

.logo a {
  color: var(--white);
  text-decoration: none;
}

.logo a:hover {
  color: var(--color5);
  text-decoration: none;
}

/* Nav */
.nav-main {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
}

.nav-main a {
  color: rgba(255,255,255,0.95);
  text-decoration: none;
  font-size: 0.95rem;
}

.nav-main a:hover {
  color: var(--color5);
  text-decoration: none;
}

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

.lang-switcher a {
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  background: rgba(255,255,255,0.15);
  color: var(--white);
  font-size: 0.85rem;
  text-decoration: none;
}

.lang-switcher a:hover {
  background: rgba(255,255,255,0.3);
  color: var(--white);
  text-decoration: none;
}

/* Main */
main {
  flex: 1;
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

/* Hero / Page title block */
.hero {
  background: linear-gradient(160deg, var(--color2) 0%, var(--color3) 100%);
  color: var(--white);
  padding: 2.5rem 2rem;
  border-radius: var(--radius);
  margin-bottom: 2rem;
  box-shadow: var(--shadow);
}

.hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1.2;
}

.hero p {
  margin: 0;
  opacity: 0.95;
  font-size: 1rem;
}

/* Content blocks */
.block {
  background: var(--white);
  border-radius: var(--radius);
  padding: 1.75rem 2rem;
  margin-bottom: 1.5rem;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--color3);
}

.block--alt {
  border-left-color: var(--color4);
  background: linear-gradient(to right, rgba(3, 209, 249, 0.06), var(--white));
}

.block--dark {
  background: var(--color1);
  color: var(--white);
  border-left-color: var(--color5);
}

.block--dark a {
  color: var(--color5);
}

h2 {
  color: var(--color2);
  font-size: 1.35rem;
  margin: 0 0 1rem;
  padding-bottom: 0.5rem;
}

h3 {
  color: var(--color3);
  font-size: 1.15rem;
  margin: 1.25rem 0 0.75rem;
}

.block p {
  margin: 0 0 1rem;
}

.block p:last-child {
  margin-bottom: 0;
}

/* Images in content - not too big */
.content-img {
  max-width: 420px;
  margin: 1rem 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow);
}

.content-img img {
  width: 100%;
  height: auto;
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
}

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

th, td {
  padding: 0.6rem 0.75rem;
  text-align: left;
  border: 1px solid rgba(13, 78, 113, 0.2);
}

th {
  background: var(--color2);
  color: var(--white);
  font-weight: 600;
}

tr:nth-child(even) {
  background: rgba(9, 136, 178, 0.06);
}

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

.faq-item {
  border: 1px solid rgba(13, 78, 113, 0.2);
  border-radius: 8px;
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.faq-q {
  width: 100%;
  padding: 1rem 1.25rem;
  text-align: left;
  font-weight: 600;
  font-size: 1rem;
  color: var(--color2);
  background: var(--white);
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.5rem;
}

.faq-q:hover {
  background: rgba(9, 136, 178, 0.08);
}

.faq-q::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color3);
  flex-shrink: 0;
}

.faq-item.is-open .faq-q::after {
  content: '−';
}

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

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

.faq-a p {
  margin: 0;
  padding-top: 0.5rem;
  border-top: 1px solid rgba(13, 78, 113, 0.15);
}

/* Footer */
.site-footer {
  background: var(--color1);
  color: var(--white);
  padding: 2rem 1.5rem;
  margin-top: 3rem;
}

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

.footer-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 2rem;
  margin-bottom: 1rem;
}

.footer-menu a {
  color: var(--color5);
  text-decoration: none;
}

.footer-menu a:hover {
  color: var(--white);
  text-decoration: underline;
}

.footer-lang {
  margin-bottom: 1rem;
}

.footer-lang a {
  color: rgba(15, 255, 248, 0.9);
  text-decoration: none;
  margin-right: 1rem;
}

.footer-lang a:hover {
  text-decoration: underline;
}

.footer-copy {
  font-size: 0.9rem;
  opacity: 0.85;
}

/* Internal links in text */
.content-links {
  margin: 1rem 0;
}

/* Mobile menu toggle for small screens */
.nav-toggle {
  display: none;
  background: transparent;
  border: 1px solid rgba(255,255,255,0.5);
  color: var(--white);
  padding: 0.5rem;
  border-radius: 6px;
  cursor: pointer;
}

@media (max-width: 768px) {
  .nav-toggle {
    display: block;
  }

  .nav-main {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-main.is-open {
    display: flex;
  }

  .lang-switcher {
    margin-left: 0;
  }

  main {
    padding: 1.5rem 1rem;
  }

  .hero {
    padding: 1.75rem 1.25rem;
  }

  .block {
    padding: 1.25rem 1.25rem;
  }

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

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

  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Print */
@media print {
  .site-header, .site-footer, .lang-switcher, .nav-main {
    background: #fff;
    color: #000;
  }
  .site-header, .site-footer {
    border: 1px solid #ccc;
  }
  a[href]::after {
    content: none;
  }
}