:root {
  --kn-bg: #ffffff;
  --kn-text: #1f2933;
  --kn-muted: #6b7280;
  --kn-border: #e5e7eb;
  --kn-surface: #f9fafb;
  --kn-shadow: rgba(31, 41, 51, 0.18);
}

html[data-theme="dark"] {
  --kn-bg: #0f172a;
  --kn-text: #e2e8f0;
  --kn-muted: #94a3b8;
  --kn-border: #1e293b;
  --kn-surface: #1e293b;
  --kn-shadow: rgba(0, 0, 0, 0.45);
}

body {
  background-color: var(--kn-bg);
  color: var(--kn-text);
  font-family: "Lato", sans-serif;
}

h1, h2, h3, h4, h5, h6 {
  font-family: "Lexend", sans-serif;
}

.kn-navbar {
  background-color: var(--kn-bg);
  border-bottom: 1px solid var(--kn-border);
}

.kn-brand {
  font-family: "Lexend", sans-serif;
  font-weight: 700;
}

.kn-nav-dropdown .navbar-dropdown {
  display: none !important;
}

.kn-nav-dropdown .navbar-dropdown.kn-dropdown-open {
  display: block !important;
}

.kn-footer {
  background-color: var(--kn-surface);
  color: var(--kn-muted);
  padding: 2rem 1.5rem;
}

@media screen and (max-width: 768px) {
  .kn-about {
    padding-top: 1.5rem;
    padding-bottom: 1.5rem;
  }

  .kn-about-container {
    gap: 1.25rem;
  }

  .kn-footer {
    padding: 1.5rem 1.25rem;
  }
}

/* Homepage / About */
.kn-about {
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.kn-about-container {
  max-width: 760px !important;
  display: flex;
  flex-direction: column;
  gap: 1.75rem;
}

.kn-about-heading {
  font-family: "Merriweather", serif;
  margin-bottom: 0.4rem !important;
}

.kn-about-body {
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--kn-muted);
}

.kn-about-body a {
  font-weight: 600;
}

.kn-about-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.kn-about-list li {
  position: relative;
  padding-left: 1.25rem;
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 1.6;
  color: var(--kn-muted);
}

.kn-about-list li::before {
  content: "•";
  position: absolute;
  left: 0;
  color: #3273dc;
}

.kn-about-list a {
  font-weight: 600;
}

.kn-post-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
  margin-top: 1.5rem;
}

@media screen and (min-width: 769px) {
  .kn-post-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media screen and (min-width: 1024px) {
  .kn-post-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media screen and (min-width: 1216px) {
  .kn-post-grid {
    grid-template-columns: repeat(5, 1fr);
  }
}

.kn-post-card {
  background-color: var(--kn-bg);
  border: 1px solid var(--kn-border);
  height: 100%;
  box-shadow: 5px 5px 0 0 var(--kn-shadow);
  overflow: hidden;
}

.kn-post-thumb {
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.kn-post-thumb img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.kn-card-title {
  font-size: 1.05rem !important;
  line-height: 1.35;
}

.kn-card-date {
  font-size: 0.8rem !important;
}

.kn-card-excerpt {
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--kn-muted);
}

.kn-card-link {
  color: inherit;
  text-decoration: none;
  display: block;
}

.kn-tag-row {
  margin-bottom: 1rem;
}

/* Blog home (/blog): masthead, category cards, featured post */
.kn-blog-home-container {
  max-width: 1152px !important;
}

.kn-blog-masthead {
  max-width: 640px;
  margin-bottom: 2.5rem;
}

.kn-blog-kicker {
  text-transform: uppercase;
  letter-spacing: 0.12em;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--kn-muted);
  margin-bottom: 0.5rem;
}

.kn-blog-title {
  font-family: "Merriweather", serif;
  font-size: 2.25rem;
  line-height: 1.2;
  margin-bottom: 0.75rem !important;
}

.kn-blog-lede {
  font-size: 1.1rem;
  line-height: 1.6;
  color: var(--kn-muted);
}

.kn-blog-categories {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.kn-blog-cat-card {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1.1rem 1.25rem;
  border: 1px solid var(--kn-border);
  border-radius: 10px;
  color: inherit;
  text-decoration: none;
  background-color: var(--kn-bg);
  transition: transform 0.12s ease, box-shadow 0.12s ease;
}

.kn-blog-cat-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 4px 4px 0 0 var(--kn-shadow);
}

.kn-blog-cat-label {
  font-family: "Lexend", sans-serif;
  font-weight: 700;
}

.kn-blog-cat-desc {
  font-size: 0.85rem;
  color: var(--kn-muted);
}

.kn-blog-cat-count {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--kn-muted);
  margin-top: 0.4rem;
}

.kn-blog-feature {
  display: flex;
  flex-direction: column;
  border: 1px solid var(--kn-border);
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 6px 6px 0 0 var(--kn-shadow);
  color: inherit;
  text-decoration: none;
  margin-bottom: 3rem;
}

.kn-blog-feature-media {
  aspect-ratio: 16 / 9;
  overflow: hidden;
}

.kn-blog-feature-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.kn-blog-feature-body {
  padding: 1.75rem;
}

.kn-blog-feature-kicker {
  display: inline-block;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  font-size: 0.7rem;
  font-weight: 700;
  color: #3273dc;
  margin-bottom: 0.5rem;
}

.kn-blog-feature-title {
  font-family: "Merriweather", serif;
  font-size: 1.6rem;
  line-height: 1.3;
  margin-bottom: 0.6rem;
}

.kn-blog-feature-excerpt {
  color: var(--kn-muted);
  line-height: 1.6;
  margin-bottom: 0.75rem;
}

.kn-blog-feature-date {
  font-size: 0.85rem;
  color: var(--kn-muted);
}

.kn-blog-section-heading {
  font-family: "Lexend", sans-serif;
  font-size: 1.3rem;
  margin-bottom: 1rem !important;
}

@media screen and (min-width: 769px) {
  .kn-blog-categories {
    grid-template-columns: repeat(5, 1fr);
  }

  .kn-blog-categories-3 {
    grid-template-columns: repeat(3, 1fr);
  }

  .kn-blog-feature {
    flex-direction: row;
  }

  .kn-blog-feature-media {
    aspect-ratio: auto;
    width: 45%;
    flex-shrink: 0;
  }

  .kn-blog-feature-body {
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .kn-blog-title {
    font-size: 2.75rem;
  }
}

.kn-post-container {
  max-width: 760px !important;
}

.kn-back-link {
  display: inline-block;
  margin-bottom: 1rem;
}

.kn-post-meta {
  color: var(--kn-muted);
  margin-bottom: 0.5rem;
}

.kn-hero img {
  width: 100%;
  border-radius: 8px;
  border: 1px solid var(--kn-border);
  box-shadow: 4px 4px 0 0 var(--kn-shadow);
  margin: 1.5rem 0;
}

@media screen and (min-width: 769px) {
  .kn-hero img {
    max-width: 80%;
    display: block;
    margin-left: auto;
    margin-right: auto;
  }
}

.kn-post-footer {
  margin-top: 2rem;
  border-top: 1px solid var(--kn-border);
  padding-top: 1.5rem;
}

/* Prose styling for post bodies rendered from stored HTML */
.prose {
  font-size: 1.05rem;
  line-height: 1.75;
}

.prose p {
  margin-bottom: 1.25em;
}

.prose h2, .prose h3 {
  margin-top: 1.75em;
  margin-bottom: 0.5em;
}

.prose blockquote {
  border-left: 4px solid var(--kn-border);
  padding-left: 1em;
  color: var(--kn-muted);
  font-style: italic;
}

.prose pre {
  background-color: var(--kn-surface);
  padding: 1em;
  overflow-x: auto;
  border-radius: 6px;
}

.prose code {
  background-color: var(--kn-surface);
  padding: 0.15em 0.35em;
  border-radius: 4px;
}

.prose img, .prose video {
  max-width: 100%;
  border-radius: 8px;
  border: 1px solid var(--kn-border);
  box-shadow: 4px 4px 0 0 var(--kn-shadow);
  cursor: zoom-in;
}

.prose figure {
  margin: 1.5em 0;
  text-align: center;
}

@media screen and (min-width: 769px) {
  .prose img, .prose video {
    max-width: 80%;
    display: block;
    margin-left: auto;
    margin-right: auto;
  }
}

.prose figcaption {
  color: var(--kn-muted);
  font-size: 0.9em;
  text-align: center;
}

/* Sand battery pages: patent / timeline / experiment */
.kn-sb-subnav {
  background-color: var(--kn-surface);
  border-bottom: 1px solid var(--kn-border);
  padding: 0.75rem 0;
}

.kn-sb-subnav-link {
  display: inline-block;
  margin-right: 1.5rem;
  color: var(--kn-muted);
  font-weight: 600;
  text-decoration: none;
}

.kn-sb-subnav-link.is-active,
.kn-sb-subnav-link:hover {
  color: var(--kn-text);
}

.kn-sb-muted {
  color: var(--kn-muted);
}

.kn-sb-block {
  border-left: 2px solid var(--kn-border);
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.kn-sb-teaser {
  border-left: 2px solid #48c78e;
  padding-left: 1.5rem;
  margin-bottom: 1.5rem;
}

.kn-sb-timeline-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 2rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--kn-border);
}

.kn-sb-timeline-footer {
  margin-top: 2rem;
  font-size: 0.9rem;
}

.kn-sb-spine {
  border-left: 2px solid var(--kn-border);
  padding-left: 1.5rem;
}

.kn-sb-year-group {
  margin-bottom: 2.5rem;
}

.kn-sb-year {
  margin-bottom: 1rem !important;
}

.kn-sb-events {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.kn-sb-event-header {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  cursor: pointer;
  padding: 1rem 1.5rem 1rem 0;
  border-radius: 8px;
  position: relative;
}

.kn-sb-event-header:hover {
  background-color: var(--kn-surface);
}

.kn-sb-event-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 0.4rem;
}

.kn-sb-entity-tag {
  font-size: 0.65rem;
  text-transform: uppercase;
}

.kn-sb-event-date {
  display: block;
  font-family: monospace;
  font-size: 0.8rem;
  color: var(--kn-muted);
  margin-bottom: 0.2rem;
}

.kn-sb-event-title {
  font-family: "Lexend", sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
}

.kn-sb-event-summary {
  color: var(--kn-muted);
  margin-top: 0.25rem;
}

.kn-sb-event-chevron {
  position: absolute;
  top: 1rem;
  right: 0;
  color: var(--kn-muted);
}

.kn-sb-event-body {
  padding: 0 1.5rem 1.25rem 0;
}

.kn-sb-event-label {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--kn-muted);
  margin-bottom: 0.25rem;
}

.kn-sb-event-images {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 0.75rem;
  margin: 1rem 0;
}

.kn-sb-event-image {
  border: none;
  padding: 0;
  cursor: zoom-in;
  border-radius: 8px;
  overflow: hidden;
  height: 140px;
}

.kn-sb-event-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.kn-sb-related-link {
  display: inline-block;
  margin-top: 0.5rem;
  font-weight: 600;
}

/* Interactive experiment / simulation */
.kn-sim-cockpit {
  background-color: var(--kn-surface);
  border-radius: 16px;
  padding: 1rem 1.25rem;
  margin-bottom: 1.25rem;
}

.kn-sim-cockpit .title {
  margin-bottom: 0.35rem;
}

.kn-sim-cockpit .subtitle {
  margin-bottom: 0.75rem;
}

.kn-sim-cockpit-head {
  display: flex;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 0.5rem;
}

.kn-sim-metrics {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.5rem;
  margin: 0.75rem 0;
}

.kn-sim-metric {
  background-color: var(--kn-bg);
  border: 1px solid var(--kn-border);
  border-radius: 10px;
  padding: 0.4rem 0.75rem;
}

.kn-sim-metric-label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--kn-muted);
  white-space: nowrap;
}

.kn-sim-metric-value {
  font-weight: 700;
  font-size: 1rem;
  white-space: nowrap;
}

.kn-sim-stage {
  position: relative;
  border-radius: 16px;
  overflow: hidden;
  background-color: #f3f4f6;
}

html[data-theme="dark"] .kn-sim-stage {
  background-color: #000;
}

.kn-sim-stage canvas {
  width: 100%;
  height: auto;
  aspect-ratio: 1000 / 640;
  display: block;
}

.kn-sim-controls {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.5rem;
  margin-top: 0.75rem;
}

@media (max-width: 640px) {
  .kn-sim-cockpit {
    padding: 0.75rem;
    border-radius: 12px;
  }

  .kn-sim-metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .kn-sim-controls .button {
    font-size: 0.9rem;
  }
}

.kn-sim-controls .button.is-active {
  box-shadow: inset 0 0 0 2px currentColor;
}

.kn-sim-tabs {
  background-color: var(--kn-surface);
  border-radius: 16px;
  padding: 1.25rem;
}

.kn-sim-video iframe {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  border: none;
  border-radius: 12px;
}

.kn-sim-timeline-year {
  margin-bottom: 2rem;
}

.kn-sim-timeline-year-desc {
  text-transform: uppercase;
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--kn-muted);
  margin-bottom: 0.75rem;
}

.kn-sim-timeline-events {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.kn-sim-timeline-event {
  display: flex;
  gap: 1rem;
  background-color: var(--kn-bg);
  border: 1px solid var(--kn-border);
  border-radius: 12px;
  padding: 1rem;
}

.kn-sim-timeline-event.is-milestone {
  border-color: #48c78e;
}

.kn-sim-timeline-event-image {
  flex-shrink: 0;
  width: 120px;
  height: 90px;
  border-radius: 8px;
  overflow: hidden;
}

.kn-sim-timeline-event-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.kn-sim-timeline-event-body time {
  display: block;
  font-family: monospace;
  font-size: 0.8rem;
  color: var(--kn-muted);
  margin: 0.15rem 0 0.4rem;
}

.kn-sim-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 1rem;
}

.kn-sim-gallery-item {
  border: 1px solid var(--kn-border);
  border-radius: 12px;
  overflow: hidden;
}

.kn-sim-gallery-image {
  aspect-ratio: 1 / 1;
  overflow: hidden;
}

.kn-sim-gallery-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.kn-sim-gallery-date {
  padding: 0.5rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 600;
}

/* Admin (login + analytics dashboard) */
.kn-admin-section {
  padding-top: 3.5rem;
}

.kn-admin-container {
  max-width: 1152px !important;
}

.kn-admin-label {
  color: var(--kn-muted);
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.kn-admin-heading {
  font-family: "Merriweather", serif;
}

.kn-admin-sub {
  color: var(--kn-muted);
  margin-bottom: 1.25rem;
}

.kn-admin-login-card {
  background-color: var(--kn-bg);
  border: 1px solid var(--kn-border);
  border-radius: 12px;
  box-shadow: 5px 5px 0 0 var(--kn-shadow);
  padding: 2rem 2.5rem;
  min-width: 320px;
}

.kn-admin-card {
  background-color: var(--kn-bg);
  border: 1px solid var(--kn-border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.kn-admin-card-title {
  font-family: "Lexend", sans-serif;
  color: var(--kn-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  font-size: 0.8rem !important;
  margin-bottom: 1rem !important;
}

.kn-admin-table {
  background-color: transparent !important;
  color: var(--kn-text);
}

.kn-admin-table thead th {
  color: var(--kn-muted);
  border-bottom-color: var(--kn-border) !important;
}

.kn-admin-table td,
.kn-admin-table th {
  border-color: var(--kn-border) !important;
}

.kn-admin-login-card .input {
  background-color: var(--kn-surface);
  border-color: var(--kn-border);
  color: var(--kn-text);
}

html[data-theme="dark"] .kn-admin-table tbody tr:hover {
  background-color: var(--kn-surface);
}

/* Lightbox */
.kn-lightbox-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  cursor: zoom-out;
}

.kn-lightbox-overlay img,
.kn-lightbox-overlay video {
  max-width: 90vw;
  max-height: 90vh;
  border-radius: 4px;
}