/* Bitcoin Ledger User Reviews - Neon theme */
:root {
  --color1: #0c3845;
  --color2: #124c58;
  --color3: #186f77;
  --color4: #20999b;
  --color5: #2bcac7;
  --bg-dark: #061a1f;
  --bg-card: #0a252b;
  --text-light: #e0f4f5;
  --text-muted: #8fb8ba;
  --neon-glow: rgba(43, 202, 199, 0.4);
  --border-subtle: rgba(32, 153, 155, 0.3);
}

* {
  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: 1.6;
  color: var(--text-light);
  background: var(--bg-dark);
  min-height: 100vh;
}

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

a {
  color: var(--color5);
  text-decoration: none;
  transition: color 0.2s, text-shadow 0.2s;
}

a:hover {
  color: #4dd9d6;
  text-shadow: 0 0 12px var(--neon-glow);
}

/* Layout */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 1rem;
}

/* Header */
.site-header {
  background: linear-gradient(180deg, var(--color1) 0%, var(--color2) 100%);
  border-bottom: 2px solid var(--color4);
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 0;
}

.logo {
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color5);
  text-shadow: 0 0 20px var(--neon-glow);
}

/* Nav */
.main-nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.5rem;
}

.main-nav a {
  color: var(--text-light);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
}

.main-nav a:hover {
  background: rgba(43, 202, 199, 0.15);
  color: var(--color5);
}

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

.lang-switcher a {
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--color4);
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--text-light);
}

.lang-switcher a:hover {
  border-color: var(--color5);
  background: rgba(43, 202, 199, 0.1);
}

/* Hero / Page title block */
.hero-block {
  background: linear-gradient(135deg, var(--color2) 0%, var(--color3) 50%, var(--color1) 100%);
  padding: 2.5rem 0;
  margin-bottom: 2rem;
  border-bottom: 3px solid var(--color4);
  box-shadow: 0 8px 32px rgba(0,0,0,0.2);
}

.hero-block h1 {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2rem);
  color: var(--text-light);
  text-shadow: 0 0 24px var(--neon-glow);
  font-weight: 700;
}

/* Content blocks */
.content-section {
  margin-bottom: 2.5rem;
}

.block-card {
  background: var(--bg-card);
  border: 1px solid var(--border-subtle);
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
  box-shadow: 0 4px 20px rgba(0,0,0,0.2);
}

.block-card h2 {
  margin: 0 0 1rem;
  font-size: 1.35rem;
  color: var(--color5);
  border-bottom: 2px solid var(--color3);
  padding-bottom: 0.5rem;
}

.block-card h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1.15rem;
  color: var(--color4);
}

.block-card p {
  margin: 0 0 0.75rem;
  color: var(--text-light);
}

/* Tables */
.table-wrap {
  overflow-x: auto;
  margin: 1rem 0;
  border-radius: 8px;
  border: 1px solid var(--border-subtle);
}

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

th, td {
  padding: 0.6rem 0.8rem;
  text-align: left;
  border-bottom: 1px solid var(--border-subtle);
}

th {
  background: var(--color2);
  color: var(--color5);
  font-weight: 600;
}

tr:nth-child(even) {
  background: rgba(12, 56, 69, 0.4);
}

/* Content image - not too big */
.content-img {
  max-width: 420px;
  margin: 1rem auto;
  border-radius: 10px;
  overflow: hidden;
  border: 2px solid var(--color3);
  box-shadow: 0 4px 16px rgba(0,0,0,0.3);
}

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

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

.faq-item {
  border: 1px solid var(--border-subtle);
  border-radius: 8px;
  margin-bottom: 0.75rem;
  overflow: hidden;
  background: var(--bg-card);
}

.faq-q {
  width: 100%;
  padding: 1rem 1.25rem;
  text-align: left;
  font-size: 1rem;
  font-weight: 600;
  color: var(--color5);
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.faq-q:hover {
  background: rgba(43, 202, 199, 0.08);
}

.faq-q::after {
  content: '+';
  font-size: 1.25rem;
  flex-shrink: 0;
  transition: transform 0.2s;
}

.faq-item[aria-expanded="true"] .faq-q::after {
  transform: rotate(45deg);
}

.faq-a {
  padding: 0 1.25rem 1rem;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.faq-item [data-faq-answer] {
  display: none;
}

.faq-item[aria-expanded="true"] [data-faq-answer] {
  display: block;
}

/* Footer */
.site-footer {
  background: linear-gradient(0deg, var(--color1) 0%, var(--color2) 100%);
  border-top: 2px solid var(--color4);
  margin-top: 3rem;
  padding: 2rem 0;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

@media (min-width: 600px) {
  .footer-inner {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 900px) {
  .footer-inner {
    grid-template-columns: 2fr 1fr 1fr;
  }
}

.footer-menu h4 {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  color: var(--color5);
}

.footer-menu ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.footer-menu li {
  margin-bottom: 0.4rem;
}

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

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

.footer-bottom {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border-subtle);
  font-size: 0.9rem;
  color: var(--text-muted);
}

/* Utility */
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* Responsive */
@media (max-width: 599px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .main-nav ul {
    flex-direction: column;
  }
}