/* =========================================================
   TITAN KB — Design System
   Inspired by NVIDIA visual language
   Theme: Black + Neon Pink (#ff006e)
   ========================================================= */

/* --- Variables ------------------------------------------ */
:root {
  --pink:       #ff006e;
  --pink-light: #ff4da6;
  --pink-glow:  rgba(255, 0, 110, 0.25);
  --pink-dim:   rgba(255, 0, 110, 0.08);

  --bg:         #000000;
  --surface-1:  #0d0d0d;
  --surface-2:  #141414;
  --surface-3:  #1c1c1c;
  --border:     #2a2a2a;
  --border-2:   #3a3a3a;

  --text:       #ffffff;
  --text-2:     #a0a0a0;
  --text-3:     #666666;

  --success:    #00e87a;
  --warning:    #ffaa00;
  --error:      #ff3333;
  --info:       #0080ff;

  --radius:     2px;
  --font:       'Arial', 'Helvetica', sans-serif;
  --mono:       'Courier New', monospace;
}

/* --- Reset ---------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  font-size: 15px;
  line-height: 1.6;
  min-height: 100vh;
}
a { color: var(--text); text-decoration: none; }
a:hover { color: var(--pink-light); }
img, svg { display: block; }

/* --- Typography ----------------------------------------- */
h1, h2, h3, h4, h5 {
  font-weight: 700;
  line-height: 1.25;
  letter-spacing: -0.01em;
}
h1 { font-size: 2rem; }
h2 { font-size: 1.5rem; }
h3 { font-size: 1.25rem; }
h4 { font-size: 1rem; }

code, pre {
  font-family: var(--mono);
  font-size: 0.88rem;
}
pre {
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-left: 3px solid var(--pink);
  padding: 1rem 1.25rem;
  overflow-x: auto;
  border-radius: var(--radius);
  line-height: 1.5;
}
code:not(pre code) {
  background: var(--surface-2);
  border: 1px solid var(--border);
  padding: 0.1em 0.4em;
  border-radius: var(--radius);
  color: var(--pink-light);
  font-size: 0.85em;
}
blockquote {
  border-left: 3px solid var(--pink);
  padding: 0.5rem 1rem;
  margin: 1rem 0;
  background: var(--pink-dim);
  color: var(--text-2);
  font-style: italic;
}
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 1.5rem 0;
}

/* --- Layout -------------------------------------------- */
.layout {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}
.main-content {
  flex: 1;
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  width: 100%;
}

/* --- Topbar -------------------------------------------- */
.topbar {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg);
  border-bottom: 2px solid var(--pink);
  display: flex;
  align-items: center;
  gap: 2rem;
  padding: 0 1.5rem;
  height: 52px;
}
.topbar-brand {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--text);
}
.topbar-brand span.accent { color: var(--pink); }
.topbar-brand .dot {
  width: 8px; height: 8px;
  background: var(--pink);
  border-radius: 50%;
  box-shadow: 0 0 8px var(--pink), 0 0 16px var(--pink-glow);
}
.topbar-nav {
  display: flex;
  align-items: center;
  gap: 0;
  flex: 1;
}
.topbar-nav a {
  font-size: 0.8rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0 1rem;
  height: 52px;
  display: flex;
  align-items: center;
  color: var(--text-2);
  border-bottom: 2px solid transparent;
  margin-bottom: -2px;
  transition: color 0.15s, border-color 0.15s;
}
.topbar-nav a:hover,
.topbar-nav a.active {
  color: var(--text);
  border-bottom-color: var(--pink);
}
.topbar-right {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-left: auto;
}
.topbar-right .user-badge {
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.topbar-search {
  position: relative;
}
.topbar-search input {
  background: var(--surface-1);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.35rem 0.75rem 0.35rem 2rem;
  font-size: 0.82rem;
  border-radius: var(--radius);
  width: 200px;
  outline: none;
  transition: border-color 0.15s;
}
.topbar-search input:focus { border-color: var(--pink); }
.topbar-search .search-icon {
  position: absolute;
  left: 0.5rem;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-3);
  font-size: 0.8rem;
}

/* --- Breadcrumb ---------------------------------------- */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.78rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
  margin-bottom: 1.5rem;
}
.breadcrumb a { color: var(--text-2); transition: color 0.15s; }
.breadcrumb a:hover { color: var(--pink); }
.breadcrumb .sep { color: var(--border-2); }
.breadcrumb .current { color: var(--pink); }

/* --- Page header --------------------------------------- */
.page-header {
  margin-bottom: 2rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}
.page-header h1 {
  font-size: 1.75rem;
  margin-bottom: 0.35rem;
}
.page-header .meta {
  font-size: 0.8rem;
  color: var(--text-3);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.page-header .meta span { color: var(--text-2); }

/* --- Cards --------------------------------------------- */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
}
.card {
  background: var(--surface-1);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  text-decoration: none;
  color: var(--text);
  transition: background 0.15s;
  border: none;
}
.card:hover {
  background: var(--surface-2);
}
.card:hover .card-title { color: var(--pink); }
.card-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--pink);
}
.card-title {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.3;
  transition: color 0.15s;
}
.card-desc {
  font-size: 0.82rem;
  color: var(--text-2);
  line-height: 1.5;
  flex: 1;
}
.card-footer {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}
.card-stat {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--text-3);
}
.card-stat span { color: var(--text-2); }

/* --- Table --------------------------------------------- */
.data-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.88rem;
}
.data-table th {
  text-align: left;
  padding: 0.6rem 1rem;
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-3);
  border-bottom: 1px solid var(--border);
  background: var(--surface-1);
  white-space: nowrap;
}
.data-table td {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border);
  vertical-align: middle;
  color: var(--text-2);
}
.data-table tr:last-child td { border-bottom: none; }
.data-table tr:hover td { background: var(--surface-1); }
.data-table td a { color: var(--text); font-weight: 700; }
.data-table td a:hover { color: var(--pink); }
.data-table .empty td {
  text-align: center;
  color: var(--text-3);
  padding: 2rem;
}

/* --- Doc type badge ------------------------------------ */
.badge {
  display: inline-block;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  padding: 0.2em 0.55em;
  border-radius: 1px;
  white-space: nowrap;
}
.badge-context      { background: rgba(0,232,122,0.12); color: #00e87a; border: 1px solid rgba(0,232,122,0.3); }
.badge-feature_spec { background: rgba(255,0,110,0.1);  color: var(--pink-light); border: 1px solid var(--pink-glow); }
.badge-plan         { background: rgba(0,128,255,0.1);  color: #4da6ff; border: 1px solid rgba(0,128,255,0.3); }
.badge-roadmap      { background: rgba(255,170,0,0.1);  color: #ffcc44; border: 1px solid rgba(255,170,0,0.3); }
.badge-decision     { background: rgba(160,80,255,0.1); color: #c080ff; border: 1px solid rgba(160,80,255,0.3); }
.badge-session      { background: rgba(255,255,255,0.06); color: var(--text-2); border: 1px solid var(--border-2); }
.badge-skill_project,
.badge-skill_global { background: rgba(255,0,110,0.08); color: var(--pink); border: 1px solid var(--pink-glow); }
.badge-design_system{ background: rgba(255,80,200,0.1); color: #ff80e0; border: 1px solid rgba(255,80,200,0.3); }
.badge-diagram      { background: rgba(0,200,255,0.08); color: #40cfff; border: 1px solid rgba(0,200,255,0.25); }
.badge-note         { background: transparent; color: var(--text-3); border: 1px solid var(--border); }

/* --- Buttons ------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.45rem 1rem;
  font-size: 0.82rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  border-radius: var(--radius);
  cursor: pointer;
  transition: all 0.15s;
  border: 2px solid transparent;
  text-decoration: none;
  white-space: nowrap;
}
.btn-primary {
  border-color: var(--pink);
  color: var(--pink);
  background: transparent;
}
.btn-primary:hover {
  background: var(--pink);
  color: #000;
  box-shadow: 0 0 12px var(--pink-glow);
}
.btn-ghost {
  border-color: var(--border-2);
  color: var(--text-2);
  background: transparent;
}
.btn-ghost:hover {
  border-color: var(--text-2);
  color: var(--text);
}
.btn-sm {
  padding: 0.3rem 0.7rem;
  font-size: 0.72rem;
}
.btn-danger {
  border-color: var(--error);
  color: var(--error);
  background: transparent;
}
.btn-danger:hover {
  background: var(--error);
  color: #fff;
}

/* --- Forms --------------------------------------------- */
.form-group { margin-bottom: 1.25rem; }
.form-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-2);
  margin-bottom: 0.4rem;
}
.form-input, .form-select {
  width: 100%;
  background: var(--surface-1);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 0.6rem 0.85rem;
  font-size: 0.88rem;
  border-radius: var(--radius);
  outline: none;
  transition: border-color 0.15s, box-shadow 0.15s;
  font-family: var(--font);
}
.form-input:focus, .form-select:focus {
  border-color: var(--pink);
  box-shadow: 0 0 0 3px var(--pink-dim);
}
.form-input::placeholder { color: var(--text-3); }

/* --- Search bar ---------------------------------------- */
.search-bar {
  display: flex;
  gap: 0.75rem;
  margin-bottom: 1.75rem;
  align-items: flex-end;
}
.search-bar .form-group { margin: 0; flex: 1; }
.search-filters {
  display: flex;
  gap: 0.75rem;
}
.search-filters .form-group { margin: 0; min-width: 160px; }

/* --- Search results ------------------------------------ */
.search-result {
  padding: 1rem 1.25rem;
  border: 1px solid var(--border);
  border-bottom: none;
  background: var(--surface-1);
  transition: background 0.15s;
}
.search-result:first-child { border-top: none; }
.search-result:last-child { border-bottom: 1px solid var(--border); }
.search-result:hover { background: var(--surface-2); }
.search-result-header {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin-bottom: 0.4rem;
}
.search-result-title {
  font-weight: 700;
  font-size: 0.95rem;
  color: var(--text);
}
.search-result-title:hover { color: var(--pink); }
.search-result-meta {
  font-size: 0.72rem;
  color: var(--text-3);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.search-result-excerpt {
  font-size: 0.82rem;
  color: var(--text-2);
  line-height: 1.6;
}
.search-result-excerpt mark {
  background: var(--pink-dim);
  color: var(--pink-light);
  border-radius: 1px;
  padding: 0 2px;
}
.no-results {
  padding: 3rem;
  text-align: center;
  color: var(--text-3);
  border: 1px solid var(--border);
}
.no-results h3 { color: var(--text-2); margin-bottom: 0.5rem; }

/* --- Document viewer ----------------------------------- */
.doc-layout {
  display: grid;
  grid-template-columns: 1fr 240px;
  gap: 2rem;
  align-items: start;
}
.doc-sidebar {
  position: sticky;
  top: 72px;
}
.doc-sidebar-section {
  background: var(--surface-1);
  border: 1px solid var(--border);
  padding: 1rem;
  margin-bottom: 1rem;
}
.doc-sidebar-title {
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.version-list { list-style: none; }
.version-list li { margin-bottom: 0.35rem; }
.version-list a {
  font-size: 0.78rem;
  color: var(--text-2);
  font-weight: 700;
}
.version-list a:hover { color: var(--pink); }
.version-list .current-version { color: var(--pink); }

/* --- Markdown content ---------------------------------- */
.doc-content {
  background: var(--surface-1);
  border: 1px solid var(--border);
  padding: 2rem 2.5rem;
  line-height: 1.7;
  min-width: 0;
}
.doc-content h1 { font-size: 1.6rem; margin: 0 0 1rem; padding-bottom: 0.75rem; border-bottom: 1px solid var(--border); }
.doc-content h2 { font-size: 1.25rem; margin: 1.75rem 0 0.75rem; padding-bottom: 0.4rem; border-bottom: 1px solid var(--border); }
.doc-content h3 { font-size: 1.05rem; margin: 1.5rem 0 0.5rem; color: var(--pink-light); }
.doc-content h4 { font-size: 0.9rem; margin: 1.25rem 0 0.4rem; color: var(--text-2); text-transform: uppercase; letter-spacing: 0.05em; }
.doc-content p { margin-bottom: 0.9rem; }
.doc-content ul, .doc-content ol { margin: 0.5rem 0 1rem 1.5rem; }
.doc-content li { margin-bottom: 0.3rem; }
.doc-content table { width: 100%; border-collapse: collapse; margin: 1rem 0; font-size: 0.88rem; }
.doc-content th { background: var(--surface-2); padding: 0.5rem 0.9rem; text-align: left; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); border-bottom: 1px solid var(--border); }
.doc-content td { padding: 0.5rem 0.9rem; border-bottom: 1px solid var(--border); color: var(--text-2); }
.doc-content tr:hover td { background: var(--surface-2); }
.doc-content a { color: var(--pink-light); text-decoration: underline 1px; }
.doc-content a:hover { color: var(--pink); }

.doc-raw {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-left: 3px solid var(--pink);
  padding: 1.5rem 2rem;
  white-space: pre-wrap;
  font-family: var(--mono);
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-2);
  overflow-x: auto;
}

/* --- Login page ---------------------------------------- */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--bg);
}
.login-card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-top: 3px solid var(--pink);
  padding: 2.5rem;
  width: 360px;
  box-shadow: 0 0 40px rgba(255,0,110,0.08);
}
.login-logo {
  text-align: center;
  margin-bottom: 2rem;
}
.login-logo h1 {
  font-size: 1.5rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text);
}
.login-logo h1 span { color: var(--pink); }
.login-logo p { font-size: 0.78rem; color: var(--text-3); margin-top: 0.25rem; text-transform: uppercase; letter-spacing: 0.08em; }
.login-error {
  background: rgba(255,51,51,0.1);
  border: 1px solid rgba(255,51,51,0.4);
  color: var(--error);
  padding: 0.65rem 1rem;
  font-size: 0.82rem;
  margin-bottom: 1.25rem;
  border-radius: var(--radius);
}

/* --- Stats row ----------------------------------------- */
.stats-row {
  display: flex;
  gap: 1px;
  background: var(--border);
  border: 1px solid var(--border);
  margin-bottom: 2rem;
}
.stat-card {
  flex: 1;
  background: var(--surface-1);
  padding: 1.25rem 1.5rem;
}
.stat-card-label {
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
  margin-bottom: 0.4rem;
}
.stat-card-value {
  font-size: 2rem;
  font-weight: 700;
  color: var(--pink);
  line-height: 1;
}
.stat-card-sub {
  font-size: 0.75rem;
  color: var(--text-3);
  margin-top: 0.25rem;
}

/* --- Footer -------------------------------------------- */
footer {
  border-top: 1px solid var(--border);
  padding: 1rem 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-3);
}
footer a { color: var(--text-3); }
footer a:hover { color: var(--pink); }

/* --- Utilities ----------------------------------------- */
.text-pink   { color: var(--pink); }
.text-muted  { color: var(--text-3); }
.text-meta   { font-size: 0.75rem; font-weight: 700; text-transform: uppercase; letter-spacing: 0.06em; color: var(--text-3); }
.flex        { display: flex; }
.items-center{ align-items: center; }
.gap-1       { gap: 0.5rem; }
.gap-2       { gap: 1rem; }
.ml-auto     { margin-left: auto; }
.mb-1        { margin-bottom: 0.5rem; }
.mb-2        { margin-bottom: 1rem; }
.mb-3        { margin-bottom: 1.5rem; }
.mt-1        { margin-top: 0.5rem; }
.mt-2        { margin-top: 1rem; }
.empty-state {
  text-align: center;
  padding: 4rem 2rem;
  color: var(--text-3);
  border: 1px solid var(--border);
  background: var(--surface-1);
}
.empty-state h3 { font-size: 1rem; color: var(--text-2); margin-bottom: 0.5rem; }
.empty-state p { font-size: 0.85rem; }

/* --- Glow pulse (brand dot) -------------------------------- */
@keyframes pulse-pink {
  0%, 100% { box-shadow: 0 0 6px var(--pink), 0 0 14px var(--pink-glow); }
  50%       { box-shadow: 0 0 10px var(--pink), 0 0 28px var(--pink-glow); }
}
.topbar-brand .dot { animation: pulse-pink 2.5s ease-in-out infinite; }

/* --- Responsive ---------------------------------------- */
@media (max-width: 900px) {
  .doc-layout { grid-template-columns: 1fr; }
  .doc-sidebar { position: static; }
  .stats-row { flex-wrap: wrap; }
  .stat-card { min-width: 50%; }
  .card-grid { grid-template-columns: 1fr; }
}
@media (max-width: 600px) {
  .topbar-search { display: none; }
  .main-content { padding: 1.25rem 1rem; }
  .doc-content { padding: 1.25rem; }
  .search-bar { flex-direction: column; }
  .search-filters { flex-direction: column; }
  .login-card { width: 100%; margin: 1rem; }
}