/* Crypto Ledger Wallet - Hardware-First Security Guide */
:root {
  --color1: #0fffac;
  --color2: #fffa48;
  --color3: #0914b2;
  --color4: #0356fc;
  --color5: #d7b0f9;
  --bg-dark: #0a0c14;
  --bg-card: #12162a;
  --text: #e8eaed;
  --text-muted: #9aa0a6;
  --border: rgba(3, 86, 252, 0.25);
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --radius: 12px;
  --shadow: 0 8px 32px rgba(9, 20, 178, 0.2);
  --transition: 0.25s ease;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg-dark);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

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

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

a:hover {
  color: var(--color1);
}

/* Layout */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10, 12, 20, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}

.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 1rem;
}

.logo {
  font-weight: 700;
  font-size: 1.15rem;
  color: var(--color1);
}

.logo a {
  color: inherit;
}

.nav-main {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.25rem;
  align-items: center;
}

.nav-main a {
  color: var(--text-muted);
  padding: 0.35rem 0.6rem;
  border-radius: 6px;
  font-size: 0.95rem;
}

.nav-main a:hover {
  color: var(--color1);
  background: rgba(15, 255, 172, 0.08);
}

.lang-switcher {
  display: flex;
  gap: 0.35rem;
  align-items: center;
}

.lang-switcher a {
  padding: 0.4rem 0.65rem;
  border-radius: 6px;
  font-size: 0.9rem;
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.lang-switcher a:hover,
.lang-switcher a.active {
  color: var(--color1);
  border-color: var(--color1);
  background: rgba(15, 255, 172, 0.06);
}

/* Hero / Page title block */
.hero {
  background: linear-gradient(145deg, var(--color3) 0%, var(--bg-card) 55%);
  padding: 2.5rem 1.25rem 3rem;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -20%;
  width: 60%;
  height: 200%;
  background: radial-gradient(ellipse, rgba(215, 176, 249, 0.15) 0%, transparent 60%);
  pointer-events: none;
}

.hero-inner {
  max-width: 900px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin: 0 0 0.75rem;
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 700;
  color: #fff;
  line-height: 1.25;
}

.hero .lead {
  margin: 0;
  font-size: 1.05rem;
  color: rgba(255,255,255,0.88);
  max-width: 700px;
}

/* Content */
.main-content {
  max-width: 820px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.content-block {
  margin-bottom: 2.5rem;
}

.content-block h2 {
  margin: 0 0 1rem;
  font-size: 1.5rem;
  color: var(--color2);
  font-weight: 600;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}

.content-block h3 {
  margin: 1.5rem 0 0.75rem;
  font-size: 1.2rem;
  color: var(--color5);
  font-weight: 600;
}

.content-block p {
  margin: 0 0 1rem;
  color: var(--text);
}

.content-block ul,
.content-block ol {
  margin: 0 0 1rem;
  padding-left: 1.5rem;
}

.content-block li {
  margin-bottom: 0.4rem;
}

/* Cards */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  margin: 1.5rem 0;
  box-shadow: var(--shadow);
}

.card-img {
  margin: 1rem 0;
  border-radius: var(--radius);
  overflow: hidden;
  max-width: 420px;
}

.card-img img {
  width: 100%;
  height: auto;
  object-fit: cover;
  loading: lazy;
}

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

table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

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

th {
  background: rgba(9, 20, 178, 0.3);
  color: var(--color2);
  font-weight: 600;
}

tr:last-child td {
  border-bottom: none;
}

tr:hover td {
  background: rgba(3, 86, 252, 0.06);
}

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

.faq-item {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  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(--text);
  background: transparent;
  border: none;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: inherit;
  transition: background var(--transition), color var(--transition);
}

.faq-q:hover {
  background: rgba(3, 86, 252, 0.1);
  color: var(--color1);
}

.faq-q::after {
  content: '+';
  font-size: 1.4rem;
  color: var(--color4);
  flex-shrink: 0;
  transition: transform var(--transition);
}

.faq-item.is-open .faq-q::after {
  transform: rotate(45deg);
}

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

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

.faq-a-inner {
  padding-top: 0.25rem;
  color: var(--text-muted);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Footer */
.site-footer {
  background: var(--bg-card);
  border-top: 1px solid var(--border);
  padding: 2.5rem 1.25rem 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;
  justify-content: center;
}

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

.footer-menu a:hover {
  color: var(--color1);
}

.footer-lang {
  display: flex;
  justify-content: center;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.footer-lang a {
  color: var(--color4);
  font-size: 0.9rem;
}

.footer-copy {
  text-align: center;
  font-size: 0.85rem;
  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: 768px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-main {
    width: 100%;
  }

  .hero {
    padding: 2rem 1rem 2.5rem;
  }

  .main-content {
    padding: 1.5rem 1rem 3rem;
  }

  .card-img {
    max-width: 100%;
  }

  th, td {
    padding: 0.5rem 0.75rem;
    font-size: 0.85rem;
  }
}

@media (max-width: 480px) {
  body {
    font-size: 15px;
  }

  .hero h1 {
    font-size: 1.45rem;
  }

  .footer-menu {
    flex-direction: column;
    align-items: center;
  }
}