/* Bitcoin Security Glossary — matches homepage design system */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  font-size: 16px;
  font-family: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  --col-bg: #faf8f5;
  --col-card: #ffffff;
  --col-tx: #212529;
  --col-tx-2: #4a4a5a;
  --col-primary: #f7931a;
  --col-primary-light: #ffa940;
  --col-primary-dim: rgba(247, 147, 26, 0.06);
  --col-accent: #1a73e8;
  --col-border: #e8e5e0;
  --col-highlight: #fff8ed;
  --max-width: 800px;
  --border-radius: 16px;
  --shadow: 0 4px 12px rgba(0, 0, 0, 0.06);
  --transition: all 0.2s ease-in-out;
}

html { scroll-behavior: smooth; }

body {
  background: var(--col-bg);
  color: var(--col-tx);
  line-height: 1.7;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

a, a:visited {
  text-decoration: none;
  color: var(--col-accent);
  font-weight: 500;
  transition: var(--transition);
  border-bottom: 1px solid rgba(26, 115, 232, 0.3);
  padding-bottom: 1px;
}
a:hover, a:active {
  color: var(--col-primary);
  border-bottom-color: var(--col-primary);
}

/* ── Navigation ── */
.main-nav {
  background: var(--col-bg);
  border-bottom: 1px solid var(--col-border);
  padding: 0.6rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  background: rgba(250, 248, 245, 0.95);
  box-shadow: 0 1px 4px rgba(0, 0, 0, 0.06);
}
.main-nav .container {
  width: min(95%, var(--max-width));
  margin: 0 auto;
  display: flex;
  align-items: center;
}
.nav-title {
  display: flex;
  color: var(--col-primary);
  font-weight: 700;
  margin-right: auto;
  font-size: 0.85rem;
  padding-right: 1rem;
  align-items: center;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  line-height: 1;
}
.nav-title a {
  color: var(--col-primary) !important;
  border: none !important;
  padding: 0;
}
.main-nav ul {
  display: flex;
  list-style: none;
  gap: 0.1rem;
  margin: 0;
  padding: 0;
}
.main-nav li { white-space: nowrap; }
.main-nav a {
  color: var(--col-tx-2);
  font-weight: 500;
  padding: 0.3rem 0.55rem;
  border-radius: 6px;
  border: none;
  font-size: 0.85rem;
  letter-spacing: 0.01em;
  transition: all 0.2s ease;
  position: relative;
}
.main-nav a::after {
  content: '';
  position: absolute;
  width: 0;
  height: 2px;
  bottom: 0;
  left: 50%;
  background: var(--col-primary);
  transition: all 0.3s ease;
  transform: translateX(-50%);
  opacity: 0;
}
.main-nav a:hover, .main-nav a:focus {
  color: var(--col-primary);
  background: transparent;
  border: none;
}
.main-nav a:hover::after, .main-nav a:focus::after {
  width: 70%;
  opacity: 1;
}
.main-nav a.nav-cta {
  background: var(--col-primary);
  color: #fff !important;
  font-weight: 600;
  border-radius: 6px;
  border-bottom: none !important;
}
.main-nav a.nav-cta:hover, .main-nav a.nav-cta:focus, .main-nav a.nav-cta:visited {
  background: var(--col-primary-light);
  color: #fff !important;
  border-bottom: none !important;
}
.main-nav a.nav-cta::after { display: none; }
.main-nav a.nav-active {
  color: var(--col-primary);
  font-weight: 600;
}

/* ── Footer ── */
footer {
  margin-top: auto;
  text-align: center;
  padding: 2.5rem 1rem;
  background: #2a2520;
  color: #f5f0eb;
}
footer p { margin: 0; color: inherit; font-size: 0.95rem; }
footer a, footer a:visited {
  color: var(--col-primary-light);
  border-bottom-color: rgba(255,169,64,0.3);
}

/* ── Breadcrumb ── */
.breadcrumb {
  margin-bottom: 1.5rem;
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  list-style: none;
  font-size: 0.88rem;
  color: var(--col-tx-2);
}
.breadcrumb li + li::before {
  content: '›';
  margin-right: 0.4rem;
  color: var(--col-tx-2);
}
.breadcrumb a { font-weight: 400; }
.breadcrumb [aria-current] {
  color: var(--col-tx);
  font-weight: 500;
}

/* ── Glossary Term Page ── */
.glossary-term-page {
  width: min(95%, var(--max-width));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.term-header {
  margin-bottom: 2rem;
}
.term-category-badge {
  display: inline-block;
  background: var(--col-primary-dim);
  color: var(--col-primary);
  font-size: 0.78rem;
  font-weight: 600;
  padding: 0.25rem 0.65rem;
  border-radius: 20px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin-bottom: 0.75rem;
  border: 1px solid rgba(247,147,26,0.15);
}
.term-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  line-height: 1.15;
  margin-bottom: 1rem;
  color: var(--col-tx);
}
.term-definition {
  font-size: 1.15rem;
  line-height: 1.7;
  color: var(--col-tx-2);
  border-left: 3px solid var(--col-primary);
  padding-left: 1.25rem;
  margin: 0;
}

/* Term body content */
.term-content {
  margin-bottom: 2rem;
}
.term-content h2 {
  font-size: 1.4rem;
  margin: 2rem 0 0.75rem;
  color: var(--col-primary);
}
.term-content h3 {
  font-size: 1.15rem;
  margin: 1.5rem 0 0.5rem;
  color: var(--col-tx);
}
.term-content p {
  margin-bottom: 1rem;
  color: var(--col-tx-2);
  font-size: 1.05rem;
}
.term-content ul, .term-content ol {
  margin: 0.5rem 0 1rem 1.5rem;
  color: var(--col-tx-2);
}
.term-content li {
  margin-bottom: 0.4rem;
  font-size: 1.02rem;
}
.term-content strong { color: var(--col-tx); }
.term-content code {
  background: var(--col-highlight);
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  font-size: 0.9em;
}
.term-content a { font-weight: 500; }

/* Security callout */
.security-callout {
  background: var(--col-primary-dim);
  border: 1px solid var(--col-border);
  border-left: 4px solid var(--col-primary);
  border-radius: var(--border-radius);
  padding: 1.5rem;
  margin-bottom: 2rem;
}
.security-callout h2 {
  font-size: 1.1rem;
  color: var(--col-primary);
  margin-bottom: 0.75rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.security-callout .sc-icon { font-size: 1.3rem; line-height: 1; }
.security-callout p {
  margin: 0;
  color: var(--col-tx-2);
  font-size: 1rem;
  line-height: 1.7;
}
.security-callout strong { color: var(--col-tx); }

/* Related terms */
.related-terms {
  margin-bottom: 2rem;
}
.related-terms h2 {
  font-size: 1.15rem;
  margin-bottom: 1rem;
  color: var(--col-tx);
}
.related-terms-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}
.related-term-card {
  display: block;
  padding: 1rem;
  background: var(--col-card);
  border: 1px solid var(--col-border);
  border-radius: 10px;
  transition: var(--transition);
  text-decoration: none;
  border-bottom: 1px solid var(--col-border);
}
.related-term-card:hover {
  box-shadow: var(--shadow);
  border-color: var(--col-primary);
  transform: translateY(-1px);
}
.related-term-card h3 {
  font-size: 0.95rem;
  color: var(--col-primary);
  margin-bottom: 0.3rem;
}
.related-term-card p {
  font-size: 0.82rem;
  color: var(--col-tx-2);
  margin: 0;
  line-height: 1.4;
}

/* Term navigation (prev/next) */
.term-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--col-border);
}
.term-nav a {
  font-size: 0.92rem;
  font-weight: 500;
  padding: 0.5rem 0;
}
.term-nav-next { margin-left: auto; }

/* ── Glossary Index Page ── */
.glossary-index-page {
  width: min(95%, var(--max-width));
  margin: 0 auto;
  padding: 2.5rem 0 3rem;
}

.glossary-header {
  text-align: center;
  margin-bottom: 2rem;
}
.glossary-header h1 {
  font-size: clamp(1.8rem, 4vw, 2.5rem);
  margin-bottom: 0.75rem;
}
.glossary-intro {
  font-size: 1.05rem;
  color: var(--col-tx-2);
  max-width: 600px;
  margin: 0 auto 1.5rem;
}

.glossary-search-wrap {
  max-width: 400px;
  margin: 0 auto 1.25rem;
}
#glossary-search {
  width: 100%;
  padding: 0.7rem 1rem 0.7rem 2.5rem;
  border: 1px solid var(--col-border);
  border-radius: 10px;
  font-size: 1rem;
  font-family: inherit;
  background: var(--col-card);
  outline: none;
  transition: var(--transition);
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%234a4a5a' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Ccircle cx='11' cy='11' r='8'/%3E%3Cline x1='21' y1='21' x2='16.65' y2='16.65'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: 0.85rem center;
}
#glossary-search:focus {
  border-color: var(--col-primary);
  box-shadow: 0 0 0 3px rgba(247,147,26,0.1);
}

/* Alphabet navigation */
.alphabet-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.3rem;
  margin-bottom: 1.5rem;
}
.alphabet-nav a, .alphabet-nav span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 600;
  border: none;
  padding: 0;
}
.alphabet-nav a {
  color: var(--col-primary);
  background: var(--col-primary-dim);
  transition: var(--transition);
}
.alphabet-nav a:hover {
  background: var(--col-primary);
  color: white;
  border: none;
}
.letter-disabled {
  color: var(--col-border);
}

/* Category filters */
.category-filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: 2rem;
}
.cat-filter {
  padding: 0.4rem 0.9rem;
  border: 1px solid var(--col-border);
  border-radius: 20px;
  background: var(--col-card);
  color: var(--col-tx-2);
  font-size: 0.85rem;
  font-family: inherit;
  font-weight: 500;
  cursor: pointer;
  transition: var(--transition);
}
.cat-filter:hover {
  border-color: var(--col-primary);
  color: var(--col-primary);
}
.cat-filter.active {
  background: var(--col-primary);
  color: white;
  border-color: var(--col-primary);
}

/* Letter groups */
.letter-group {
  margin-bottom: 1.5rem;
}
.letter-heading {
  font-size: 1.3rem;
  color: var(--col-primary);
  padding-bottom: 0.5rem;
  border-bottom: 2px solid var(--col-primary-dim);
  margin-bottom: 0.75rem;
}

/* Term cards on index */
.term-card {
  display: block;
  padding: 1rem 1.25rem;
  margin-bottom: 0.5rem;
  background: var(--col-card);
  border: 1px solid var(--col-border);
  border-left: 3px solid var(--col-primary);
  border-radius: 10px;
  transition: var(--transition);
  text-decoration: none;
  border-bottom: 1px solid var(--col-border);
}
.term-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-1px);
  border-color: var(--col-primary);
  border-left-color: var(--col-primary);
}
.term-card h3 {
  font-size: 1.05rem;
  color: var(--col-tx);
  margin-bottom: 0.3rem;
}
.term-card p {
  font-size: 0.9rem;
  color: var(--col-tx-2);
  margin: 0 0 0.4rem;
  line-height: 1.5;
}
.term-category-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--col-primary);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  :root { font-size: 15px; }
  .glossary-term-page, .glossary-index-page { padding: 1.5rem 0 2rem; }
  .term-header h1 { font-size: 1.6rem; }
  .related-terms-grid { grid-template-columns: 1fr; }
  .term-nav { flex-direction: column; gap: 0.5rem; }
  .term-nav-next { margin-left: 0; }
  .alphabet-nav a, .alphabet-nav span { width: 1.8rem; height: 1.8rem; font-size: 0.8rem; }
  .category-filters { gap: 0.3rem; }
  .cat-filter { font-size: 0.8rem; padding: 0.35rem 0.7rem; }
  .main-nav .container { padding: 0 0.5rem; }
}

@media (max-width: 480px) {
  .glossary-header h1 { font-size: 1.5rem; }
  .term-definition { font-size: 1.05rem; }
}