/* Ledger Cold Wallet - Color scheme & responsive */
:root {
  --color1: #00ffa7;
  --color2: #ddff52;
  --color3: #002212;
  --color4: #727875;
  --color5: #e2e2e2;
  --bg-dark: #001a0f;
  --bg-card: rgba(0, 34, 18, 0.6);
  --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(--color5);
  background: var(--bg-dark);
  min-height: 100vh;
  overflow-x: hidden;
}

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

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

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

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color3);
  border-bottom: 2px solid var(--color1);
  padding: 0.75rem 1rem;
}

.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(--color1);
}

.nav-menu {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-menu a {
  color: var(--color5);
  padding: 0.35rem 0.5rem;
}

.nav-menu a:hover {
  color: var(--color2);
}

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

.lang-switcher a {
  padding: 0.35rem 0.6rem;
  border: 1px solid var(--color4);
  border-radius: 4px;
  font-size: 0.9rem;
}

.lang-switcher a:hover,
.lang-switcher a.active {
  border-color: var(--color1);
  color: var(--color1);
}

/* Main */
main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

/* Blocks */
.hero {
  background: linear-gradient(135deg, var(--color3) 0%, var(--bg-dark) 100%);
  border: 1px solid var(--color1);
  border-radius: 12px;
  padding: 2rem;
  margin-bottom: 2rem;
}

.hero h1 {
  margin: 0 0 1rem;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  color: var(--color1);
  line-height: 1.3;
}

.section-block {
  background: var(--bg-card);
  border: 1px solid var(--color4);
  border-radius: 10px;
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.section-block h2 {
  margin: 0 0 1rem;
  font-size: 1.5rem;
  color: var(--color2);
  border-bottom: 1px solid var(--color4);
  padding-bottom: 0.5rem;
}

.section-block h3 {
  margin: 1.25rem 0 0.5rem;
  font-size: 1.2rem;
  color: var(--color1);
}

.content-img {
  max-width: 420px;
  margin: 1rem auto;
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--color4);
}

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

/* Tables */
table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  font-size: 0.95rem;
}

th, td {
  border: 1px solid var(--color4);
  padding: 0.6rem 0.75rem;
  text-align: left;
}

th {
  background: var(--color3);
  color: var(--color2);
}

tr:nth-child(even) {
  background: rgba(0, 255, 167, 0.05);
}

/* FAQ */
.section-block:has(.faq-list) {
  padding: 1.75rem;
}

.faq-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.faq-list li {
  background: rgba(0, 34, 18, 0.5);
  border: 1px solid var(--color4);
  border-radius: 10px;
  overflow: hidden;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.faq-list li:hover {
  border-color: rgba(0, 255, 167, 0.4);
}

.faq-list li:focus-within {
  border-color: var(--color1);
  box-shadow: 0 0 0 1px var(--color1);
}

.faq-list .faq-q {
  width: 100%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  padding: 1.1rem 1.25rem;
  background: transparent;
  border: none;
  color: var(--color5);
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
  text-align: left;
  cursor: pointer;
  font-family: inherit;
  transition: color 0.2s ease;
}

.faq-list .faq-q:hover {
  color: var(--color1);
}

.faq-list .faq-q::after {
  content: '+';
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: 2px solid var(--color1);
  border-radius: 50%;
  background: rgba(0, 255, 167, 0.08);
  font-size: 1.35rem;
  font-weight: 300;
  color: var(--color1);
  line-height: 1;
  transition: background 0.2s ease, transform 0.25s ease;
}

.faq-list .faq-q:hover::after {
  background: rgba(0, 255, 167, 0.18);
}

.faq-list .faq-q[aria-expanded="true"]::after {
  content: '−';
  background: rgba(0, 255, 167, 0.2);
  transform: rotate(180deg);
}

.faq-list .faq-a {
  padding: 0 1.25rem 1.25rem;
  margin: -0.25rem 0 0;
  color: var(--color4);
  font-size: 0.98rem;
  line-height: 1.65;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.faq-list .faq-a[aria-hidden="false"] {
  max-height: 600px;
  border-top: 1px solid rgba(114, 120, 117, 0.3);
  padding-top: 1rem;
  margin-top: 0;
}

/* Footer */
.site-footer {
  background: var(--color3);
  border-top: 2px solid var(--color1);
  padding: 2rem 1rem;
  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 1rem;
  padding: 0;
}

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

.footer-menu a:hover {
  color: var(--color2);
}

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

.footer-lang a {
  margin-right: 0.75rem;
}

.copyright {
  margin-top: 1rem;
  font-size: 0.9rem;
  color: var(--color4);
}

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

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

  .nav-menu {
    flex-direction: column;
  }

  main {
    padding: 1rem 0.75rem 2rem;
  }

  .hero, .section-block {
    padding: 1.25rem;
  }

  table {
    font-size: 0.85rem;
  }

  th, td {
    padding: 0.4rem 0.5rem;
  }
}

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

  .hero h1 {
    font-size: 1.35rem;
  }
}