/* APRS Service Registry — modern UI
   Variables, typography, and components
*/
:root {
  --bg: #f8fafc;
  --bg-elevated: #ffffff;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --text: #0f172a;
  --text-muted: #64748b;
  --accent: #0d9488;
  --accent-hover: #0f766e;
  --accent-soft: rgba(13, 148, 136, 0.12);
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.08);
  --font-sans: "DM Sans", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, monospace;
  --transition: 0.2s ease;
}

* {
  box-sizing: border-box;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  margin: 0;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* ---- Header ---- */
.site-header {
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  padding: 1.25rem 0;
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  font-size: 1.5rem;
  font-weight: 700;
  margin: 0;
  letter-spacing: -0.02em;
  color: var(--text);
}

.site-tagline {
  font-size: 0.9rem;
  color: var(--text-muted);
  margin: 0.15rem 0 0 0;
}

.header-nav {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.nav-link {
  padding: 0.5rem 0.9rem;
  color: var(--text);
  text-decoration: none;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: 0.9rem;
  transition: background var(--transition), color var(--transition);
}

.nav-link:hover {
  background: var(--accent-soft);
  color: var(--accent);
}

.nav-link--outline {
  border: 1px solid var(--border-strong);
}

.nav-link--outline:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

/* ---- Main ---- */
main {
  flex: 1;
  padding: 2rem 0 3rem;
}

.section {
  margin-bottom: 2.5rem;
}

.section:last-of-type {
  margin-bottom: 0;
}

.section-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 0.25rem;
}

.section-header h2,
.section h2 {
  font-size: 1.35rem;
  font-weight: 700;
  margin: 0 0 0.5rem 0;
  letter-spacing: -0.02em;
}

.section-desc {
  color: var(--text-muted);
  margin: 0 0 1.25rem 0;
  max-width: 42rem;
}

.badge-count {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.65rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  border-radius: 999px;
}

/* ---- Table card ---- */
.table-card {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  overflow: hidden;
}

.table-responsive {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.services-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9375rem;
}

.services-table th {
  text-align: left;
  font-weight: 600;
  color: var(--text-muted);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.9rem 1.1rem;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.services-table td {
  padding: 0.9rem 1.1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
}

.services-table tbody tr {
  transition: background var(--transition);
}

.services-table tbody tr:hover {
  background: var(--accent-soft);
}

.services-table tbody tr:last-child td {
  border-bottom: none;
}

.callsign {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text);
}

.link-external {
  color: var(--accent);
  text-decoration: none;
  word-break: break-all;
  transition: color var(--transition);
}

.link-external:hover {
  color: var(--accent-hover);
  text-decoration: underline;
}

.software {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  background: var(--bg);
  padding: 0.2rem 0.5rem;
  border-radius: 4px;
  color: var(--text-muted);
}

/* ---- Empty state ---- */
.empty-state {
  text-align: center;
  padding: 3rem 2rem;
  color: var(--text-muted);
}

.empty-state__icon {
  font-size: 2.5rem;
  color: var(--border-strong);
  margin-bottom: 0.75rem;
  line-height: 1;
}

.empty-state h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--text);
  margin: 0 0 0.5rem 0;
}

.empty-state p {
  margin: 0;
}

.empty-state a {
  color: var(--accent);
  font-weight: 500;
}

/* ---- Register section ---- */
.section--register h2 {
  margin-bottom: 0.5rem;
}

.section--register > .container > p:first-of-type {
  color: var(--text-muted);
  margin-bottom: 1.5rem;
}

.section--register a {
  color: var(--accent);
  font-weight: 500;
}

.section--register a:hover {
  color: var(--accent-hover);
}

/* ---- Accordion overrides ---- */
.accordion-docs {
  --bs-accordion-border-color: var(--border);
  --bs-accordion-btn-bg: var(--bg-elevated);
  --bs-accordion-active-bg: var(--accent-soft);
  --bs-accordion-btn-focus-box-shadow: 0 0 0 0.2rem var(--accent-soft);
  --bs-accordion-border-radius: var(--radius);
}

.accordion-docs .accordion-item {
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin-bottom: 0.5rem;
  overflow: hidden;
}

.accordion-docs .accordion-item:last-child {
  margin-bottom: 0;
}

.accordion-docs .accordion-button {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text);
  padding: 1rem 1.25rem;
  background: transparent;
  box-shadow: none;
}

.accordion-docs .accordion-button:not(.collapsed) {
  color: var(--accent);
  background: var(--accent-soft);
}

.accordion-docs .accordion-button::after {
  width: 1rem;
  height: 1rem;
}

.accordion-docs .accordion-body {
  padding: 0 1.25rem 1.25rem;
  border-top: 1px solid var(--border);
}

.accordion-docs .accordion-body p {
  margin: 0 0 0.75rem 0;
}

.accordion-docs .accordion-body p:last-child {
  margin-bottom: 0;
}

.accordion-docs .accordion-body .mb-2 { margin-bottom: 0.5rem; }
.accordion-docs .accordion-body .mt-3 { margin-top: 1rem; }

/* ---- Code blocks ---- */
.code-block {
  position: relative;
  background: #1e293b;
  border-radius: var(--radius-sm);
  overflow: hidden;
  margin-bottom: 0.75rem;
}

.code-block:last-child {
  margin-bottom: 0;
}

.code-block pre {
  margin: 0;
  padding: 1rem 1.25rem;
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  line-height: 1.5;
  color: #e2e8f0;
}

.code-block pre code {
  background: none;
  padding: 0;
  color: inherit;
}

.btn-copy {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  padding: 0.35rem 0.65rem;
  font-size: 0.75rem;
  font-weight: 500;
  font-family: var(--font-sans);
  color: #94a3b8;
  background: rgba(255, 255, 255, 0.08);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 4px;
  cursor: pointer;
  transition: color var(--transition), background var(--transition), border-color var(--transition);
}

.btn-copy:hover {
  color: #e2e8f0;
  background: rgba(255, 255, 255, 0.12);
  border-color: rgba(255, 255, 255, 0.2);
}

.btn-copy--done {
  color: #34d399;
  border-color: rgba(52, 211, 153, 0.4);
  background: rgba(52, 211, 153, 0.1);
}

/* ---- Footer ---- */
.site-footer {
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  padding: 1.25rem 0;
  margin-top: auto;
}

.site-footer p {
  margin: 0;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* ---- DataTables overrides ---- */
.dataTables_wrapper {
  padding: 0;
}

.dataTables_wrapper .dataTables_length,
.dataTables_wrapper .dataTables_filter {
  padding: 1rem 1.1rem;
  padding-bottom: 0.75rem;
}

.dataTables_wrapper .dataTables_length label,
.dataTables_wrapper .dataTables_filter label {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.dataTables_wrapper .dataTables_length select {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.3rem 1.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  margin: 0 0.25rem;
  background: var(--bg-elevated);
  color: var(--text);
}

.dataTables_wrapper .dataTables_filter input {
  font-family: var(--font-sans);
  font-size: 0.9rem;
  padding: 0.45rem 0.75rem;
  margin-left: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-elevated);
  color: var(--text);
  transition: border-color var(--transition), box-shadow var(--transition);
}

.dataTables_wrapper .dataTables_filter input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.dataTables_wrapper .dataTables_info {
  padding: 0.75rem 1.1rem;
  font-size: 0.875rem;
  color: var(--text-muted);
}

.dataTables_wrapper .dataTables_paginate {
  padding: 0.75rem 1.1rem;
}

.dataTables_wrapper .dataTables_paginate .paginate_button {
  padding: 0.4rem 0.75rem;
  margin: 0 0.15rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text);
  transition: all var(--transition);
}

.dataTables_wrapper .dataTables_paginate .paginate_button:hover {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.dataTables_wrapper .dataTables_paginate .paginate_button.current {
  background: var(--accent);
  border-color: var(--accent);
  color: #fff;
}

.dataTables_wrapper .dataTables_paginate .paginate_button.disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Responsive: stack header nav on small screens */
@media (max-width: 576px) {
  .header-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .site-title {
    font-size: 1.3rem;
  }

  .section-header h2,
  .section h2 {
    font-size: 1.2rem;
  }

  .services-table th,
  .services-table td {
    padding: 0.7rem 0.9rem;
    font-size: 0.875rem;
  }

  .code-block pre {
    padding: 0.9rem 1rem;
    font-size: 0.8rem;
  }

  .btn-copy {
    top: 0.5rem;
    right: 0.5rem;
    padding: 0.25rem 0.5rem;
    font-size: 0.7rem;
  }
}