/* Crypto Ledger Guide - Multilingual Site */
:root {
  --color1: #123123;
  --color2: #0a6b93;
  --color3: #ff0f3f;
  --color4: #ffe246;
  --color5: #fffbe7;
  --font-main: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --font-head: 'Segoe UI', system-ui, sans-serif;
  --shadow: 0 4px 20px rgba(18, 49, 35, 0.12);
  --radius: 12px;
  --radius-lg: 20px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-main);
  font-size: 16px;
  line-height: 1.65;
  color: var(--color1);
  background: var(--color5);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a {
  color: var(--color2);
  text-decoration: none;
}

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

img {
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius);
}

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--color1) 0%, #0d2525 100%);
  color: var(--color5);
  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-family: var(--font-head);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color5);
}

.logo:hover {
  color: var(--color4);
  text-decoration: none;
}

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

.nav-main a {
  color: var(--color5);
  padding: 0.35rem 0.6rem;
  border-radius: 8px;
}

.nav-main a:hover {
  background: rgba(255,255,255,0.15);
  color: var(--color4);
  text-decoration: none;
}

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

.lang-switcher a {
  color: var(--color5);
  padding: 0.35rem 0.6rem;
  border: 1px solid rgba(255,255,255,0.4);
  border-radius: 8px;
  font-size: 0.9rem;
}

.lang-switcher a:hover {
  background: rgba(255,255,255,0.2);
  border-color: var(--color4);
  color: var(--color4);
  text-decoration: none;
}

/* Hero / intro block */
.hero {
  background: linear-gradient(160deg, var(--color2) 0%, var(--color1) 100%);
  color: var(--color5);
  padding: 3rem 1.5rem;
  text-align: center;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero p {
  margin: 0;
  opacity: 0.95;
  max-width: 680px;
  margin-left: auto;
  margin-right: auto;
  font-size: 1.05rem;
}

/* Content container */
.main-content {
  flex: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

/* Typography */
h1 {
  color: var(--color1);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  margin: 0 0 1.5rem;
  line-height: 1.25;
}

h2 {
  color: var(--color2);
  font-size: 1.35rem;
  margin: 2.5rem 0 1rem;
  padding-bottom: 0.35rem;
  border-bottom: 2px solid var(--color4);
}

h3 {
  color: var(--color1);
  font-size: 1.15rem;
  margin: 1.5rem 0 0.75rem;
}

p {
  margin: 0 0 1rem;
}

/* Blocks */
.block {
  margin-bottom: 2.5rem;
}

.block-img {
  margin: 1.5rem 0;
}

.block-img img {
  width: 100%;
  max-width: 520px;
  margin: 0 auto;
  box-shadow: var(--shadow);
}

.card {
  background: #fff;
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--color2);
}

.card--warning {
  border-left-color: var(--color3);
  background: linear-gradient(to right, rgba(255,15,63,0.06), #fff);
}

.card--tip {
  border-left-color: var(--color4);
  background: linear-gradient(to right, rgba(255,226,70,0.15), #fff);
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  margin: 1.25rem 0;
  border-radius: var(--radius);
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}

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

th, td {
  padding: 0.75rem 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(18,49,35,0.12);
}

th {
  background: var(--color1);
  color: var(--color5);
  font-weight: 600;
}

tr:nth-child(even) {
  background: rgba(18,49,35,0.04);
}

/* Lists */
ul, ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

li {
  margin-bottom: 0.35rem;
}

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

.faq-item {
  margin-bottom: 0.5rem;
  border: 1px solid rgba(18,49,35,0.15);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
}

.faq-q {
  width: 100%;
  padding: 1rem 1.25rem;
  text-align: left;
  font-family: inherit;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color1);
  background: none;
  border: none;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 0.75rem;
}

.faq-q:hover {
  background: rgba(10,107,147,0.08);
}

.faq-q::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color2);
  flex-shrink: 0;
}

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

.faq-a {
  padding: 0 1.25rem 1rem;
  display: none;
  color: var(--color1);
}

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

.faq-a-inner {
  padding-top: 0.25rem;
  border-top: 1px solid rgba(18,49,35,0.1);
}

/* Internal links in text */
.content-body a {
  color: var(--color2);
  font-weight: 500;
}

/* Footer */
.site-footer {
  background: var(--color1);
  color: var(--color5);
  padding: 2.5rem 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: 1.5rem;
}

.footer-menu a {
  color: var(--color5);
}

.footer-menu a:hover {
  color: var(--color4);
  text-decoration: none;
}

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

.footer-lang a {
  color: rgba(255,255,255,0.85);
  margin-right: 1rem;
}

.footer-lang a:hover {
  color: var(--color4);
  text-decoration: none;
}

.footer-copy {
  font-size: 0.9rem;
  opacity: 0.85;
  margin: 0;
}

/* Responsive */
@media (max-width: 768px) {
  .site-header {
    padding: 0.75rem 1rem;
  }

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

  .nav-main {
    width: 100%;
  }

  .hero {
    padding: 2rem 1rem;
  }

  .main-content {
    padding: 1.5rem 1rem;
  }

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

@media (min-width: 769px) {
  .block-img img {
    max-width: 480px;
  }
}