/* Bitcoin Ledger Setup – color scheme & layout */
:root {
  --color1: #ffb2b8;
  --color2: #e2c9bc;
  --color3: #003e83;
  --color4: #127c9f;
  --color5: #b1bdc1;
  --bg-light: #faf8f6;
  --text: #1a1a1a;
  --text-muted: #555;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  margin: 0;
  background: var(--bg-light);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

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

a {
  color: var(--color4);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* Header */
.site-header {
  background: linear-gradient(135deg, var(--color3) 0%, #002a5c 100%);
  color: #fff;
  padding: 1rem 1.5rem;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,62,131,0.2);
}

.header-inner {
  max-width: 1100px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-logo {
  font-weight: 700;
  font-size: 1.15rem;
}

.site-logo a {
  color: #fff;
}

.site-logo a:hover {
  color: var(--color1);
  text-decoration: none;
}

/* Nav */
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
}

.main-nav a {
  color: rgba(255,255,255,0.95);
  font-weight: 500;
}

.main-nav a:hover {
  color: var(--color1);
  text-decoration: none;
}

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

.lang-switcher a {
  color: rgba(255,255,255,0.9);
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}

.lang-switcher a:hover,
.lang-switcher a.active {
  background: rgba(255,255,255,0.15);
  color: #fff;
  text-decoration: none;
}

/* Main content */
.main-content {
  flex: 1;
  max-width: 900px;
  margin: 0 auto;
  padding: 2rem 1.5rem 3rem;
  width: 100%;
}

/* Blocks */
.hero-block {
  background: linear-gradient(160deg, var(--color2) 0%, #f5ebe4 100%);
  padding: 2rem 1.5rem;
  border-radius: 12px;
  margin-bottom: 2rem;
  border-left: 4px solid var(--color3);
}

.hero-block h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--color3);
}

.content-block {
  background: #fff;
  padding: 1.75rem 1.5rem;
  border-radius: 10px;
  margin-bottom: 1.5rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

.content-block h2 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
  color: var(--color3);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--color2);
}

.content-block h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1.1rem;
  color: var(--color4);
}

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

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

/* 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 var(--color5);
}

th {
  background: var(--color3);
  color: #fff;
  font-weight: 600;
}

tr:nth-child(even) {
  background: rgba(177,189,193,0.15);
}

/* Images in content */
.content-block .figure-img {
  max-width: 320px;
  margin: 1rem 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.08);
}

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

/* Lists */
ul.steps, ol.steps {
  margin: 0.75rem 0;
  padding-left: 1.5rem;
}

.content-block ul:not(.steps) {
  margin: 0.75rem 0;
  padding-left: 1.5rem;
}

/* FAQ */
.faq-block {
  background: #fff;
  padding: 2rem 1.5rem;
  border-radius: 10px;
  margin-top: 2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}

.faq-block h2 {
  margin: 0 0 1.25rem;
  color: var(--color3);
  font-size: 1.35rem;
}

.faq-item {
  border: 1px solid var(--color5);
  border-radius: 8px;
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.faq-item summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--color3);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.faq-item summary::-webkit-details-marker {
  display: none;
}

.faq-item summary::after {
  content: '+';
  font-size: 1.25rem;
  color: var(--color4);
  flex-shrink: 0;
}

.faq-item[open] summary::after {
  content: '−';
}

.faq-item .faq-answer {
  padding: 0 1.25rem 1rem;
  color: var(--text-muted);
  border-top: 1px solid rgba(177,189,193,0.4);
}

.faq-item .faq-answer p {
  margin: 0.5rem 0 0;
}

/* Internal links */
.internal-links {
  margin: 1.5rem 0;
  padding: 1rem 1.25rem;
  background: rgba(18,124,159,0.08);
  border-radius: 8px;
  border-left: 4px solid var(--color4);
}

.internal-links p {
  margin: 0;
}

/* Footer */
.site-footer {
  background: var(--color3);
  color: #fff;
  padding: 2rem 1.5rem;
  margin-top: auto;
}

.footer-inner {
  max-width: 1100px;
  margin: 0 auto;
}

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

.footer-menu ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
}

.footer-menu a {
  color: rgba(255,255,255,0.9);
}

.footer-menu a:hover {
  color: var(--color1);
  text-decoration: none;
}

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

.footer-lang a {
  color: rgba(255,255,255,0.85);
  margin-right: 0.75rem;
}

.footer-lang a:hover {
  color: #fff;
  text-decoration: none;
}

.footer-copy {
  font-size: 0.9rem;
  color: rgba(255,255,255,0.7);
  margin: 0;
}

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

/* Responsive */
@media (max-width: 768px) {
  .site-header {
    padding: 0.75rem 1rem;
  }
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }
  .main-content {
    padding: 1.5rem 1rem 2rem;
  }
  .hero-block, .content-block {
    padding: 1.25rem 1rem;
  }
  .faq-item summary {
    padding: 0.75rem 1rem;
  }
  .footer-menu ul {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }
  .main-nav ul {
    flex-direction: column;
  }
}