/* ===== Sovereign Knowledge OS — Style ===== */
/* MD is the brain. HTML is the shell. */

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:       #0a0a0a;
  --bg-panel: #111111;
  --bg-card:  #1a1a1a;
  --text:     #e8e8e8;
  --text-dim: #999999;
  --accent:   #00ff88;
  --accent-d: #00cc6a;
  --gold:     #d4a017;
  --gold-dim: #a07c12;
  --gold-bg:  #1a1508;
  --gold-border: #3d2e0a;
  --border:   #2a2a2a;
  --danger:   #ff4444;
  --radius:   6px;
  --font:     system-ui, -apple-system, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
}

html { font-size: 16px; scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  min-height: 100vh;
  overflow: hidden;          /* app shell — children scroll */
}

/* ===== TOP HEADER ===== */
.site-header {
  background: linear-gradient(135deg, #0d0d0d 0%, #1a1a1a 100%);
  border-bottom: 2px solid var(--accent);
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  flex-shrink: 0;
  z-index: 100;
}
.site-header h1 {
  font-size: 1.6rem;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .5px;
  white-space: nowrap;
}
.site-header .subtitle {
  font-size: .85rem;
  color: var(--text-dim);
  display: none;
}
@media (min-width: 768px) {
  .site-header .subtitle { display: inline; }
}
.site-header .submit-btn {
  background: transparent;
  color: var(--accent);
  border: 1px solid var(--accent);
  padding: 6px 14px;
  border-radius: var(--radius);
  font-size: .85rem;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
  transition: background .15s, color .15s;
}
.site-header .submit-btn:hover {
  background: var(--accent);
  color: var(--bg);
}

/* ===== SEARCH BAR===== */
.search-bar {
  padding: 12px 24px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.search-bar input {
  width: 100%;
  padding: 10px 16px;
  font-size: 1rem;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  outline: none;
  transition: border-color .2s;
}
.search-bar input:focus {
  border-color: var(--accent);
}
.search-bar input::placeholder { color: var(--text-dim); }

/* ===== APP SHELL — SPLIT PANE ===== */
.app-shell {
  display: flex;
  flex-direction: column;
  height: 100vh;
}
.split-pane {
  display: flex;
  flex: 1;
  min-height: 0;            /* allow children to scroll */
  overflow: hidden;
}

/* LEFT PANEL — list */
.left-panel {
  flex: 1 1 50%;
  overflow-y: auto;
  padding: 0;
  min-width: 0;
  transition: flex .25s ease;
}
.left-panel.collapsed {
  flex: 0 0 0;
  overflow: hidden;
  padding: 0;
}

/* RIGHT PANEL — preview */
.right-panel {
  flex: 0 0 0;
  overflow: hidden;
  background: var(--bg-panel);
  border-left: 2px solid var(--border);
  display: flex;
  flex-direction: column;
  transition: flex .25s ease;
}
.right-panel.open {
  flex: 1 1 50%;
}
.preview-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 8px 16px;
  background: var(--bg-card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  min-height: 42px;
}
.preview-toolbar .preview-title {
  font-size: .9rem;
  color: var(--text);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  flex: 1;
  margin-right: 8px;
}
.preview-toolbar button {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-dim);
  width: 32px; height: 32px;
  border-radius: var(--radius);
  cursor: pointer;
  font-size: 1.1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-left: 6px;
  transition: background .15s, color .15s;
  flex-shrink: 0;
}
.preview-toolbar button:hover {
  background: var(--border);
  color: var(--text);
}
.preview-body {
  flex: 1;
  overflow-y: auto;
  padding: 0;
  position: relative;
}
.preview-body iframe {
  width: 100%; height: 100%;
  border: none;
  background: #fff;
}
.preview-body .md-render {
  padding: 24px;
  font-size: 1rem;
  line-height: 1.7;
}
.preview-body .md-render h1 { font-size: 1.5rem; color: var(--accent); margin: 0 0 12px; }
.preview-body .md-render h2 { font-size: 1.25rem; color: var(--accent-d); margin: 16px 0 8px; }
.preview-body .md-render h3 { font-size: 1.1rem; color: var(--text); margin: 14px 0 6px; }
.preview-body .md-render p { margin: 0 0 10px; }
.preview-body .md-render ul, .preview-body .md-render ol { margin: 0 0 10px; padding-left: 24px; }
.preview-body .md-render li { margin: 4px 0; }
.preview-body .md-render strong { color: #fff; }
.preview-body .md-render code {
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 3px;
  font-size: .9em;
}
.preview-body .md-render a {
  color: var(--accent);
  text-decoration: underline;
}
.preview-body .md-render hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 16px 0;
}
.preview-body .open-tab-btn {
  display: inline-block;
  margin: 16px 24px;
  padding: 8px 18px;
  background: var(--accent);
  color: var(--bg);
  border: none;
  border-radius: var(--radius);
  font-size: .9rem;
  font-weight: 600;
  cursor: pointer;
  text-decoration: none;
}
.preview-body .open-tab-btn:hover { background: var(--accent-d); }

.preview-body .iframe-fallback {
  padding: 24px;
  text-align: center;
  color: var(--text-dim);
}
.preview-body .iframe-fallback p { margin-bottom: 12px; }

/* ===== LEFT PANEL CONTENT ===== */
.panel-section {
  padding: 20px 24px 8px;
}
.panel-section h2 {
  font-size: 1.3rem;
  margin-bottom: 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}
.panel-section h2 a {
  color: var(--accent);
  text-decoration: none;
}
.panel-section h2 a:hover { text-decoration: underline; }

/* ===== ECHO CORE 64 SECTION ===== */
.echo-core-section {
  background: var(--gold-bg);
  border: 1px solid var(--gold-border);
  border-radius: var(--radius);
  margin: 16px;
  padding: 0;
}
.echo-core-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 20px;
  cursor: pointer;
  user-select: none;
}
.echo-core-header h2 {
  font-size: 1.25rem;
  color: var(--gold);
  margin: 0;
  padding: 0;
  border: none;
  display: flex;
  align-items: center;
  gap: 8px;
}
.echo-core-header h2 .ec-badge {
  font-size: .7rem;
  background: var(--gold);
  color: var(--bg);
  padding: 2px 8px;
  border-radius: 10px;
  font-weight: 700;
  letter-spacing: .5px;
}
.echo-core-header .ec-toggle {
  font-size: 1.2rem;
  color: var(--gold-dim);
  transition: transform .2s;
}
.echo-core-header .ec-toggle.collapsed { transform: rotate(-90deg); }
.echo-core-body {
  max-height: 500px;
  overflow-y: auto;
  padding: 0 12px 12px;
  transition: max-height .3s ease;
}
.echo-core-body.collapsed {
  max-height: 0;
  overflow: hidden;
  padding: 0 12px;
}
.echo-core-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 0 8px 10px;
}
.echo-core-tabs button {
  background: transparent;
  border: 1px solid var(--gold-border);
  color: var(--gold-dim);
  padding: 4px 10px;
  border-radius: 12px;
  font-size: .75rem;
  cursor: pointer;
  transition: all .15s;
}
.echo-core-tabs button:hover,
.echo-core-tabs button.active {
  background: var(--gold);
  color: var(--bg);
  border-color: var(--gold);
}

.ec-node {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .12s;
  border-bottom: 1px solid var(--gold-border);
}
.ec-node:last-child { border-bottom: none; }
.ec-node:hover { background: rgba(212, 160, 23, .08); }
.ec-node .ec-id {
  font-size: .7rem;
  color: var(--gold);
  font-weight: 700;
  white-space: nowrap;
  min-width: 50px;
  padding-top: 2px;
  font-family: monospace;
}
.ec-node .ec-info { flex: 1; min-width: 0; }
.ec-node .ec-title {
  font-size: .9rem;
  color: var(--text);
  font-weight: 600;
}
.ec-node .ec-cat {
  font-size: .65rem;
  text-transform: uppercase;
  letter-spacing: .5px;
  color: var(--gold-dim);
  margin-left: 6px;
}
.ec-node .ec-desc {
  font-size: .8rem;
  color: var(--text-dim);
  margin-top: 2px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* ===== SEARCH RESULTS ===== */
.search-results {
  padding: 0 16px;
}
.search-results:empty { display: none; }
.sr-group-label {
  font-size: .75rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  padding: 10px 8px 4px;
  font-weight: 700;
}
.sr-group-label.core-label { color: var(--gold); }
.sr-group-label.general-label { color: var(--accent); }
.sr-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  cursor: pointer;
  transition: background .12s;
}
.sr-item:hover { background: var(--bg-card); }
.sr-item .sr-badge {
  font-size: .65rem;
  padding: 2px 7px;
  border-radius: 10px;
  font-weight: 700;
  white-space: nowrap;
  margin-top: 2px;
}
.sr-item .sr-badge.core {
  background: var(--gold);
  color: var(--bg);
}
.sr-item .sr-badge.general {
  background: var(--accent);
  color: var(--bg);
}
.sr-item .sr-title {
  font-size: .95rem;
  font-weight: 600;
  color: var(--text);
}
.sr-item .sr-desc {
  font-size: .8rem;
  color: var(--text-dim);
  margin-top: 2px;
}

/* ===== CATEGORY NAV ===== */
.category-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 12px 24px;
  background: var(--bg-panel);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}
.category-nav a {
  font-size: .8rem;
  color: var(--text-dim);
  text-decoration: none;
  padding: 4px 12px;
  border: 1px solid var(--border);
  border-radius: 14px;
  transition: all .15s;
}
.category-nav a:hover, .category-nav a.active {
  color: var(--accent);
  border-color: var(--accent);
}

/* ===== KNOWLEDGE ENTRIES LIST ===== */
.knowledge-entry {
  padding: 12px 24px;
  border-bottom: 1px solid var(--border);
  cursor: pointer;
  transition: background .12s;
}
.knowledge-entry:hover { background: var(--bg-card); }
.knowledge-entry h3 {
  font-size: 1.05rem;
  color: var(--text);
  margin-bottom: 4px;
}
.knowledge-entry .ke-meta {
  font-size: .8rem;
  color: var(--text-dim);
}
.knowledge-entry .ke-meta .ke-cat {
  color: var(--accent);
  text-transform: uppercase;
  font-size: .7rem;
  letter-spacing: .5px;
  font-weight: 600;
}

/* ===== MOBILE: BOTTOM SHEET ===== */
@media (max-width: 767px) {
  .split-pane { flex-direction: column; position: relative; }
  .left-panel { flex: 1 1 100% !important; }
  .right-panel {
    position: fixed;
    bottom: 0; left: 0; right: 0;
    flex: none !important;
    height: 0;
    border-left: none;
    border-top: 2px solid var(--accent);
    border-radius: 16px 16px 0 0;
    z-index: 200;
    transition: height .3s ease;
  }
  .right-panel.open {
    height: 75vh;
  }
  .right-panel .preview-toolbar {
    border-radius: 16px 16px 0 0;
  }
  /* drag handle */
  .right-panel.open::before {
    content: '';
    display: block;
    width: 40px; height: 4px;
    background: var(--text-dim);
    border-radius: 2px;
    margin: 6px auto 0;
    position: absolute;
    top: 0; left: 50%;
    transform: translateX(-50%);
    z-index: 10;
  }
  .site-header h1 { font-size: 1.2rem; }
  .echo-core-section { margin: 8px; }
  .panel-section { padding: 14px 16px 6px; }
}

/* ===== SCROLLBAR ===== */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: var(--bg); }
::-webkit-scrollbar-thumb { background: var(--border); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--text-dim); }

/* ===== VISUALLY HIDDEN (accessibility) ===== */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  border: 0;
}

/* ===== Pre-rendered link styles ===== */
.ec-link {
  color: #d4a017;
  text-decoration: none;
  transition: color .2s;
}
.ec-link:hover {
  color: #ffd700;
  text-decoration: underline;
}
.ec-link:visited {
  color: #b8860b;
}

.ke-title-link {
  color: var(--accent);
  text-decoration: none;
}
.ke-title-link:hover {
  text-decoration: underline;
}

.ke-sub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding: 4px 0 12px 12px;
}
.ke-link {
  display: inline-block;
  padding: 3px 10px;
  font-size: .82rem;
  color: var(--accent);
  border: 1px solid var(--border);
  border-radius: 4px;
  text-decoration: none;
  transition: background .2s, color .2s;
}
.ke-link:hover {
  background: var(--accent);
  color: var(--bg);
}

.federation-link {
  display: block;
  padding: 8px 12px;
  margin-bottom: 4px;
  color: var(--accent);
  text-decoration: none;
  border-left: 2px solid var(--border);
  transition: border-color .2s, background .2s;
  font-size: .92rem;
}
.federation-link:hover {
  border-left-color: var(--accent);
  background: rgba(0, 255, 136, .06);
}