/* Crypto Ledger App - Design System */
:root {
  --color1: #7f231c;
  --color2: #a43521;
  --color3: #dd562d;
  --color4: #ff894d;
  --color5: #ffcb64;
  --bg-dark: #1a1514;
  --bg-card: #241c1b;
  --bg-section: #2d2322;
  --text-primary: #f5f0ed;
  --text-muted: #b8a9a3;
  --border-subtle: rgba(255, 137, 77, 0.15);
  --shadow: 0 8px 32px rgba(0,0,0,0.3);
  --radius: 12px;
  --radius-lg: 20px;
  --font-sans: 'Segoe UI', system-ui, -apple-system, sans-serif;
  --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-primary);
  background: var(--bg-dark);
  min-height: 100vh;
}

/* Typography */
h1, h2, h3, h4 { margin-top: 0; line-height: 1.2; }
h1 { font-size: clamp(1.75rem, 4vw, 2.25rem); color: var(--color5); margin-bottom: 1rem; }
h2 { font-size: clamp(1.35rem, 3vw, 1.65rem); color: var(--color4); margin: 2rem 0 1rem; border-bottom: 1px solid var(--border-subtle); padding-bottom: 0.5rem; }
h3 { font-size: clamp(1.15rem, 2.5vw, 1.35rem); color: var(--color3); margin: 1.5rem 0 0.75rem; }
p { margin: 0 0 1rem; color: var(--text-muted); }
a { color: var(--color4); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color5); }

/* Layout */
.container { max-width: 960px; margin: 0 auto; padding: 0 1.25rem; }
.container--wide { max-width: 1100px; }

/* Header */
.site-header {
  background: linear-gradient(180deg, var(--bg-card) 0%, transparent 100%);
  padding: 1rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--border-subtle);
}
.site-header .container { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 1rem; }
.logo { font-weight: 700; font-size: 1.25rem; color: var(--color5); }
.nav-main { display: flex; align-items: center; gap: 1.5rem; flex-wrap: wrap; }
.nav-main a { color: var(--text-muted); font-size: 0.95rem; }
.nav-main a:hover { color: var(--color4); }
.lang-switcher { display: flex; gap: 0.5rem; }
.lang-switcher a {
  padding: 0.35rem 0.65rem;
  border-radius: 6px;
  font-size: 0.85rem;
  background: var(--bg-section);
  color: var(--text-muted);
}
.lang-switcher a:hover, .lang-switcher a[aria-current="true"] { background: var(--color2); color: var(--text-primary); }

/* Hero / Lead block */
.hero {
  padding: 3rem 0;
  background: linear-gradient(135deg, var(--bg-section) 0%, var(--bg-dark) 50%);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  margin-bottom: 2rem;
}
.hero h1 { margin-bottom: 0.5rem; }
.hero .lead { font-size: 1.1rem; color: var(--text-muted); max-width: 720px; }

/* Content blocks */
.block { margin-bottom: 2.5rem; }
.block--card {
  background: var(--bg-card);
  border-radius: var(--radius);
  padding: 1.75rem;
  border: 1px solid var(--border-subtle);
  box-shadow: var(--shadow);
}
.block--accent { border-left: 4px solid var(--color3); padding-left: 1.25rem; }
.block--highlight { background: linear-gradient(90deg, rgba(127,35,28,0.2) 0%, transparent 100%); padding: 1.25rem; border-radius: var(--radius); }

/* Images */
.content-img {
  max-width: 420px;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  border: 1px solid var(--border-subtle);
  margin: 1rem 0;
  display: block;
}
.content-img--right { float: right; margin-left: 1.5rem; }
.content-img--left { float: left; margin-right: 1.5rem; }
@media (max-width: 640px) {
  .content-img--right, .content-img--left { float: none; margin-left: 0; margin-right: 0; }
}

/* Tables */
.table-wrap { overflow-x: auto; margin: 1.5rem 0; }
table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
  background: var(--bg-card);
  border-radius: var(--radius);
  overflow: hidden;
}
th, td { padding: 0.75rem 1rem; text-align: left; border-bottom: 1px solid var(--border-subtle); }
th { background: var(--color2); color: var(--text-primary); font-weight: 600; }
tr:last-child td { border-bottom: none; }
tr:hover td { background: rgba(255,137,77,0.05); }

/* FAQ */
.faq-list { margin: 1.5rem 0; }
.faq-item {
  background: var(--bg-card);
  border-radius: var(--radius);
  margin-bottom: 0.5rem;
  border: 1px solid var(--border-subtle);
  overflow: hidden;
}
.faq-item summary {
  padding: 1rem 1.25rem;
  cursor: pointer;
  font-weight: 600;
  color: var(--text-primary);
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after { content: '+'; color: var(--color4); font-size: 1.25rem; }
.faq-item[open] summary::after { content: '−'; }
.faq-item .faq-answer { padding: 0 1.25rem 1rem; color: var(--text-muted); border-top: 1px solid var(--border-subtle); }
.faq-item .faq-answer p { margin: 0.75rem 0 0; }

/* Lists */
ul, ol { margin: 0 0 1rem; padding-left: 1.5rem; color: var(--text-muted); }
li { margin-bottom: 0.35rem; }

/* Footer */
.site-footer {
  margin-top: 4rem;
  padding: 2.5rem 0 1.5rem;
  background: var(--bg-section);
  border-top: 1px solid var(--border-subtle);
}
.site-footer .container { display: grid; grid-template-columns: 1fr auto; gap: 2rem; align-items: start; }
@media (max-width: 640px) { .site-footer .container { grid-template-columns: 1fr; } }
.footer-nav { display: flex; flex-wrap: wrap; gap: 1rem 1.5rem; }
.footer-nav a { color: var(--text-muted); font-size: 0.9rem; }
.footer-nav a:hover { color: var(--color4); }
.footer-copy { margin-top: 1.5rem; padding-top: 1rem; border-top: 1px solid var(--border-subtle); font-size: 0.85rem; color: var(--text-muted); }

/* Buttons / CTAs */
.btn {
  display: inline-block;
  padding: 0.6rem 1.25rem;
  border-radius: 8px;
  font-weight: 600;
  background: linear-gradient(135deg, var(--color3), var(--color2));
  color: var(--text-primary);
  border: none;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
}
.btn:hover { opacity: 0.95; transform: translateY(-1px); }

/* Mobile menu (optional toggle for small screens) */
@media (max-width: 640px) {
  .nav-main { width: 100%; }
  body { font-size: 16px; }
}

/* Utility */
.color1 { color: #7f231c; }
.color2 { color: #a43521; }
.color3 { color: #dd562d; }
.color4 { color: #ff894d; }
.color5 { color: #ffcb64; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }