:root {
  --bg: #0c0f14;
  --bg-elevated: #121824;
  --panel: #1a2332;
  --text: #e8edf5;
  --muted: #8b9bb4;
  --accent: #3d8bfd;
  --accent-dim: rgba(61, 139, 253, 0.15);
  --border: #2d3a4d;
  --accent-2: #22c55e;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  line-height: 1.5;
}

/* —— Site header —— */
.site-header {
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0.65rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.site-brand {
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
}

.site-brand-name {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.02em;
}

.site-brand-tag {
  font-size: 0.7rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 0.15rem;
  flex-wrap: wrap;
}

.site-nav > a.nav-link,
.site-nav > .nav-dd > .nav-dd-label {
  color: var(--muted);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: 6px;
  font-size: 0.9rem;
  cursor: pointer;
  border: none;
  background: none;
  font: inherit;
  user-select: none;
}

.site-nav > a.nav-link:hover,
.site-nav > .nav-dd:hover > .nav-dd-label,
.site-nav > .nav-dd:focus-within > .nav-dd-label {
  color: var(--text);
  background: var(--accent-dim);
}

.site-nav a.nav-link.active,
.site-nav > .nav-dd > a.nav-dd-label.active {
  color: var(--accent);
  background: var(--accent-dim);
}

.nav-dd {
  position: relative;
  z-index: 1;
}

/* Keep dropdown above siblings while pointer is over label or menu */
.nav-dd:hover,
.nav-dd:focus-within {
  z-index: 200;
}

.nav-dd-label {
  display: inline-block;
}

.nav-dd-menu {
  display: none;
  position: absolute;
  /* Overlap label slightly so the pointer never crosses a dead gap (hover would drop) */
  top: calc(100% - 0.35rem);
  left: 0;
  margin-top: 0;
  min-width: 11rem;
  padding: 0.5rem 0.35rem 0.35rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 8px;
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.45);
  z-index: 201;
}

.nav-dd:hover .nav-dd-menu,
.nav-dd:focus-within .nav-dd-menu {
  display: block;
}

.nav-dd-menu a {
  display: block;
  padding: 0.45rem 0.65rem;
  color: var(--muted);
  text-decoration: none;
  border-radius: 6px;
  font-size: 0.88rem;
}

.nav-dd-menu a:hover {
  color: var(--text);
  background: var(--accent-dim);
}

/* —— Hub home —— */
.hub-hero {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem 1.25rem 1rem;
}

.hub-hero h1 {
  font-size: clamp(1.6rem, 3vw, 2rem);
  font-weight: 700;
  margin: 0 0 0.5rem;
  letter-spacing: -0.03em;
}

.hub-hero .lead {
  color: var(--muted);
  font-size: 1.05rem;
  max-width: 42rem;
  margin: 0 0 2rem;
}

.category-grid {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1rem;
}

.category-card {
  display: block;
  padding: 1.25rem 1.35rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  text-decoration: none;
  color: inherit;
  transition: border-color 0.15s, transform 0.15s;
}

.category-card:hover {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.category-card h2 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
  font-weight: 600;
}

.category-card p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.category-card .card-meta {
  margin-top: 0.75rem;
  font-size: 0.75rem;
  color: var(--accent-2);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* —— Breadcrumb & Rockwell subnav —— */
.breadcrumb {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.75rem 1.25rem 0;
  font-size: 0.82rem;
  color: var(--muted);
}

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

.breadcrumb a:hover {
  text-decoration: underline;
}

.breadcrumb span.sep {
  margin: 0 0.35rem;
  opacity: 0.5;
}

.rockwell-subnav {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0.5rem 1.25rem 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  border-bottom: 1px solid var(--border);
}

.rockwell-subnav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.4rem 0.75rem;
  border-radius: 6px 6px 0 0;
  font-size: 0.88rem;
}

.rockwell-subnav a:hover {
  color: var(--text);
  background: var(--accent-dim);
}

.rockwell-subnav a.active {
  color: var(--accent);
  background: var(--panel);
  border: 1px solid var(--border);
  border-bottom-color: var(--bg);
  margin-bottom: -1px;
}

/* —— Legacy nav (fallback) —— */
nav.simple-nav {
  display: flex;
  gap: 0.5rem;
  align-items: center;
  padding: 0.75rem 1.25rem;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
  flex-wrap: wrap;
}

nav.simple-nav a {
  color: var(--muted);
  text-decoration: none;
  padding: 0.35rem 0.75rem;
  border-radius: 6px;
}

nav.simple-nav a:hover {
  color: var(--text);
  background: var(--accent-dim);
}

nav.simple-nav a.active {
  color: var(--accent);
  background: var(--accent-dim);
}

.brand {
  font-weight: 600;
  margin-right: 1rem;
  color: var(--text);
}

main {
  padding: 1.25rem;
  max-width: 1400px;
  margin: 0 auto;
}

h1 {
  font-size: 1.35rem;
  font-weight: 600;
  margin: 0 0 0.5rem;
}

p.hint {
  color: var(--muted);
  margin: 0 0 1rem;
  font-size: 0.95rem;
}

.placeholder-block {
  background: var(--panel);
  border: 1px dashed var(--border);
  border-radius: 10px;
  padding: 2rem 1.5rem;
  color: var(--muted);
  max-width: 36rem;
}

.about-visual {
  margin: 0 0 1.5rem;
  max-width: 52rem;
}

.about-visual img,
.about-visual svg {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 12px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
}

.about-visual figcaption {
  margin-top: 0.5rem;
  font-size: 0.8rem;
  color: var(--muted);
}

.l5x-settings {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  margin-bottom: 1.25rem;
  padding: 1rem 1.1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  max-width: 36rem;
}

.l5x-settings .field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 12rem;
  flex: 1;
}

.l5x-settings label {
  font-size: 0.85rem;
  color: var(--muted);
}

.l5x-settings input[type="text"] {
  font: inherit;
  padding: 0.45rem 0.6rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
}

.l5x-settings input[type="text"]:focus {
  outline: 2px solid rgba(61, 139, 253, 0.45);
  outline-offset: 1px;
}

.tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.75rem;
  margin-top: 1rem;
  max-width: 900px;
}

.tool-grid a {
  display: block;
  padding: 1rem;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
}

.tool-grid a:hover {
  border-color: var(--accent);
}

.tool-grid a span {
  display: block;
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--muted);
  margin-top: 0.25rem;
}

.toolbar {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  flex-wrap: wrap;
}

button {
  font: inherit;
  padding: 0.45rem 1rem;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel);
  color: var(--text);
  cursor: pointer;
}

button.primary {
  background: var(--accent);
  border-color: transparent;
  color: #fff;
}

button:hover {
  filter: brightness(1.08);
}

#hot {
  border: 1px solid var(--border);
  border-radius: 8px;
  overflow: hidden;
}

.handsontable {
  font-size: 13px;
}