/* Ledger Firmware - Design system */
:root {
  --color1: #0fffdd;
  --color2: #d2ff60;
  --color3: #052be0;
  --color4: #f330dd;
  --color5: #ff92c5;
  --bg-dark: #0a0a12;
  --bg-card: #12121f;
  --bg-section: #0d0d18;
  --text: #e8e8f0;
  --text-muted: #9898a8;
  --font-sans: 'DM Sans', system-ui, sans-serif;
  --font-display: 'Outfit', system-ui, sans-serif;
  --radius: 12px;
  --radius-lg: 20px;
  --shadow: 0 8px 32px rgba(0,0,0,0.3);
  --transition: 0.25s ease;
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg-dark);
  min-height: 100vh;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, .font-display { font-family: var(--font-display); }
h1 { font-size: clamp(1.75rem, 4vw, 2.5rem); font-weight: 700; line-height: 1.2; margin: 0 0 1rem; }
h2 { font-size: clamp(1.35rem, 3vw, 1.75rem); font-weight: 600; margin: 2rem 0 1rem; }
h3 { font-size: clamp(1.1rem, 2.5vw, 1.35rem); font-weight: 600; margin: 1.5rem 0 0.75rem); }
p { margin: 0 0 1rem; color: var(--text-muted); }
a { color: var(--color1); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color2); }

/* Accent colors in headings */
h1 .c1 { color: var(--color1); }
h1 .c2 { color: var(--color2); }
h2 .c3 { color: var(--color3); }
h2 .c4 { color: var(--color4); }
h3 .c5 { color: var(--color5); }

/* Layout */
.container { width: 100%; max-width: 1140px; margin: 0 auto; padding: 0 1.25rem; }
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(10,10,18,0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid rgba(255,255,255,0.06);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; min-height: 64px; flex-wrap: wrap; gap: 0.75rem; }
.logo { font-family: var(--font-display); font-weight: 700; font-size: 1.25rem; color: var(--color1); }
.nav-main { display: flex; flex-wrap: wrap; gap: 0.5rem 1.25rem; align-items: center; }
.nav-main a { color: var(--text); font-weight: 500; padding: 0.35rem 0; }
.nav-main a:hover { color: var(--color1); }
.lang-switch { display: flex; gap: 0.5rem; align-items: center; }
.lang-switch a {
  padding: 0.4rem 0.75rem;
  border-radius: var(--radius);
  font-weight: 500;
  font-size: 0.9rem;
  background: var(--bg-card);
  color: var(--text-muted);
}
.lang-switch a:hover, .lang-switch a.active { background: var(--color3); color: #fff; }

/* Hero / first block */
.hero {
  padding: 3rem 0 2.5rem;
  background: linear-gradient(160deg, var(--bg-section) 0%, var(--bg-dark) 60%);
}
.hero h1 { margin-bottom: 1rem; }
.hero .lead { font-size: 1.1rem; color: var(--text); max-width: 72ch; }

/* Content blocks - alternating styles */
.block {
  padding: 2rem 0;
  border-bottom: 1px solid rgba(255,255,255,0.05);
}
.block:nth-child(even) { background: var(--bg-section); }
.block-content { display: grid; gap: 1.5rem; }
@media (min-width: 768px) {
  .block-content.with-img { grid-template-columns: 1fr 280px; align-items: start; }
  .block-content.with-img.reverse { direction: rtl; }
  .block-content.with-img.reverse > * { direction: ltr; }
}
.block-content img {
  width: 100%;
  max-width: 320px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
  object-fit: cover;
}

/* Cards */
.card-grid { display: grid; gap: 1rem; margin: 1rem 0; }
@media (min-width: 640px) { .card-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .card-grid { grid-template-columns: repeat(3, 1fr); } }
.card {
  background: var(--bg-card);
  border: 1px solid rgba(255,255,255,0.08);
  border-radius: var(--radius);
  padding: 1.25rem;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.card:hover { border-color: rgba(15,255,221,0.3); box-shadow: 0 4px 24px rgba(5,43,224,0.15); }
.card h3 { margin-top: 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-bottom: 1px solid rgba(255,255,255,0.08); }
th { background: var(--bg-card); color: var(--color1); font-weight: 600; }
tr:hover td { background: rgba(255,255,255,0.02); }

/* Lists */
ul, ol { margin: 0 0 1rem; padding-left: 1.25rem; color: var(--text-muted); }
li { margin-bottom: 0.35rem; }

/* FAQ */
.faq-section { padding: 2.5rem 0; }
.faq-list { margin: 0; padding: 0; list-style: none; }
.faq-item { border-bottom: 1px solid rgba(255,255,255,0.08); }
.faq-q { padding: 1rem 0; font-weight: 600; color: var(--text); cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.faq-q::after { content: '+'; font-size: 1.25rem; color: var(--color1); }
.faq-item.open .faq-q::after { content: '−'; }
.faq-a { padding: 0 0 1rem; color: var(--text-muted); display: none; }
.faq-item.open .faq-a { display: block; }

/* CTA / links block */
.cta-block {
  padding: 2rem;
  background: linear-gradient(135deg, rgba(5,43,224,0.2), rgba(243,48,221,0.1));
  border-radius: var(--radius-lg);
  border: 1px solid rgba(255,255,255,0.08);
  margin: 2rem 0;
}
.cta-block a { font-weight: 600; }

/* Footer */
.site-footer {
  background: var(--bg-section);
  border-top: 1px solid rgba(255,255,255,0.06);
  padding: 2.5rem 0 1.5rem;
  margin-top: 3rem;
}
.footer-grid { display: grid; gap: 1.5rem; margin-bottom: 2rem; }
@media (min-width: 640px) { .footer-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 900px) { .footer-grid { grid-template-columns: repeat(4, 1fr); } }
.footer-col h4 { font-size: 0.95rem; color: var(--color1); margin: 0 0 0.75rem; text-transform: uppercase; letter-spacing: 0.05em; }
.footer-col ul { list-style: none; padding: 0; margin: 0; }
.footer-col a { color: var(--text-muted); }
.footer-col a:hover { color: var(--color1); }
.footer-bottom { padding-top: 1.5rem; border-top: 1px solid rgba(255,255,255,0.06); font-size: 0.9rem; color: var(--text-muted); text-align: center; }

/* Buttons */
.btn { display: inline-block; padding: 0.6rem 1.25rem; border-radius: var(--radius); font-weight: 600; transition: opacity var(--transition), transform var(--transition); }
.btn-primary { background: var(--color3); color: #fff; border: none; }
.btn-primary:hover { opacity: 0.9; transform: translateY(-1px); }

/* Utility */
.text-center { text-align: center; }
.mb-0 { margin-bottom: 0; }
img { max-width: 100%; height: auto; vertical-align: middle; }

/* Skip link */
.skip-link { position: absolute; top: -100px; left: 0; background: var(--color3); color: #fff; padding: 0.5rem 1rem; z-index: 200; border-radius: var(--radius); }
.skip-link:focus { top: 0; }