:root {
  color-scheme: light;
  --bg: #ffffff;
  --surface: rgba(255, 255, 255, 0.74);
  --surface-strong: #ffffff;
  --text: #111827;
  --text-muted: #4b5563;
  --line: rgba(17, 24, 39, 0.12);
  --line-strong: rgba(17, 24, 39, 0.34);
  --brand: #4b5563;
  --accent: #6b7280;
  --danger: #ef4444;
  --success: #16a34a;
  --shadow: 0 18px 44px rgba(17, 24, 39, 0.1);
  --bg-grad-a: rgba(148, 163, 184, 0.16);
  --bg-grad-b: rgba(203, 213, 225, 0.18);
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #0b0b0c;
  --surface: rgba(24, 24, 27, 0.78);
  --surface-strong: #121214;
  --text: #f9fafb;
  --text-muted: #9ca3af;
  --line: rgba(148, 163, 184, 0.22);
  --line-strong: rgba(212, 212, 216, 0.38);
  --brand: #d4d4d8;
  --accent: #a1a1aa;
  --danger: #ff7b7b;
  --success: #22c55e;
  --shadow: 0 20px 56px rgba(0, 0, 0, 0.56);
  --bg-grad-a: rgba(63, 63, 70, 0.22);
  --bg-grad-b: rgba(39, 39, 42, 0.24);
}

* {
  box-sizing: border-box;
}

html,
body {
  min-height: 100%;
  margin: 0;
}

body {
  font-family: "Space Grotesk", "Outfit", sans-serif;
  color: var(--text);
  background: radial-gradient(circle at 10% 10%, var(--bg-grad-a), transparent 35%),
    radial-gradient(circle at 90% 80%, var(--bg-grad-b), transparent 30%),
    var(--bg);
  line-height: 1.5;
  overflow-x: hidden;
}

.hidden {
  display: none !important;
}

.aurora {
  position: fixed;
  z-index: -1;
  width: 42rem;
  height: 42rem;
  filter: blur(80px);
  opacity: 0.22;
  pointer-events: none;
}

.aurora-top {
  top: -16rem;
  right: -10rem;
  background: radial-gradient(circle, #9ca3af, transparent 60%);
}

.aurora-bottom {
  bottom: -18rem;
  left: -8rem;
  background: radial-gradient(circle, #a1a1aa, transparent 60%);
  animation-delay: -8s;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.85rem 1.4rem;
  border-bottom: 1px solid transparent;
  backdrop-filter: blur(18px) saturate(120%);
  transition: background-color 250ms ease, border-color 250ms ease;
}

.site-header.scrolled {
  background: color-mix(in oklab, var(--surface) 82%, transparent);
  border-color: var(--line);
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: inherit;
}

.brand-icon {
  width: 2.65rem;
  height: 2.65rem;
  border-radius: 0.72rem;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid var(--line);
  background: #000;
}

.brand-logo-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.brand-label {
  margin: 0;
  font-family: "Outfit", sans-serif;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.brand-subtitle {
  margin: 0;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.nav-links {
  display: flex;
  gap: 1rem;
}

.nav-links a {
  text-decoration: none;
  color: var(--text-muted);
  font-weight: 600;
  font-size: 0.95rem;
  position: relative;
}

.nav-links a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -0.3rem;
  width: 100%;
  height: 2px;
  border-radius: 99px;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 200ms ease;
}

.nav-links a[aria-current="page"]::after,
.nav-links a:hover::after,
.nav-links a:focus-visible::after {
  transform: scaleX(1);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.55rem;
}

.theme-toggle {
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 999px;
  color: var(--text);
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  padding: 0.35rem 0.7rem 0.35rem 0.35rem;
  cursor: pointer;
}

.theme-toggle-track {
  width: 2.3rem;
  height: 1.25rem;
  border-radius: 999px;
  background: color-mix(in oklab, var(--brand) 55%, #999);
  display: flex;
  align-items: center;
  padding: 0.12rem;
}

.theme-toggle-thumb {
  width: 0.96rem;
  height: 0.96rem;
  border-radius: 50%;
  background: #fff;
  transform: translateX(0);
  transition: transform 220ms ease;
}

:root[data-theme="dark"] .theme-toggle-thumb {
  transform: translateX(1.03rem);
}

.theme-toggle-label {
  font-size: 0.82rem;
  font-weight: 600;
}

.auth-trigger {
  white-space: nowrap;
}

.auth-user {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  border: 1px solid var(--line);
  background: var(--surface);
  border-radius: 0.85rem;
  padding: 0.34rem 0.42rem 0.34rem 0.64rem;
}

#authWelcome {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
}

.page-shell {
  width: min(1120px, 92vw);
  margin: 0 auto;
  padding: 0.8rem 0 4rem;
}

.hero {
  padding: 2.3rem 0 1.8rem;
  display: grid;
  gap: 0.9rem;
}

.eyebrow {
  margin: 0;
  color: var(--accent);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
}

.hero h1,
.hero h2 {
  margin: 0;
  font-family: "Outfit", sans-serif;
  font-size: clamp(2rem, 3.8vw, 3.2rem);
  line-height: 1.12;
}

.hero-text {
  margin: 0;
  color: var(--text-muted);
  max-width: 74ch;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.hero-brand-visual {
  width: min(760px, 100%);
  height: clamp(220px, 32vw, 340px);
  border: 1px solid var(--line);
  background: color-mix(in oklab, var(--surface) 94%, transparent);
  border-radius: 1rem;
  overflow: hidden;
  box-shadow: var(--shadow);
  pointer-events: none;
}

.hero-brand-image {
  width: 100%;
  height: 100%;
  display: block;
  object-fit: cover;
  object-position: center;
  filter: grayscale(1) contrast(1.08);
  pointer-events: none;
}

.content-section {
  margin-top: 2rem;
}

.section-heading {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.section-heading h2 {
  margin: 0.3rem 0 0;
  font-size: clamp(1.45rem, 2.3vw, 2rem);
  font-family: "Outfit", sans-serif;
}

.section-copy {
  margin: 0;
  max-width: 48ch;
  color: var(--text-muted);
}

.toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
  margin-bottom: 1.1rem;
}

.toolbar label {
  display: grid;
  gap: 0.28rem;
}

.field-label {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 600;
}

input,
select,
textarea {
  min-height: 2.55rem;
  border-radius: 0.75rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  padding: 0.55rem 0.7rem;
  font: inherit;
}

input:focus-visible,
select:focus-visible,
textarea:focus-visible,
button:focus-visible,
a:focus-visible {
  outline: 2px solid color-mix(in oklab, var(--brand) 65%, white);
  outline-offset: 2px;
}

textarea {
  min-height: 5.6rem;
  resize: vertical;
}

.btn {
  border: 0;
  border-radius: 0.85rem;
  padding: 0.7rem 1rem;
  font-family: inherit;
  font-weight: 700;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.btn:hover {
  transform: translateY(-2px);
}

.btn-primary {
  background: linear-gradient(120deg, #111827, #374151);
  color: #f9fafb;
  box-shadow: var(--shadow);
}

:root[data-theme="dark"] .btn-primary {
  background: linear-gradient(120deg, #3f3f46, #27272a);
}

.btn-secondary {
  border: 1px solid var(--line);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
  color: var(--text);
  backdrop-filter: blur(10px) saturate(112%);
}

.btn-compact {
  padding: 0.45rem 0.7rem;
  border-radius: 0.65rem;
  font-size: 0.78rem;
}

.btn.wide {
  width: 100%;
}

.featured-blog-card {
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  background: color-mix(in oklab, var(--surface) 90%, transparent);
  backdrop-filter: blur(16px) saturate(115%);
  box-shadow: var(--shadow);
  padding: 1rem;
  margin-bottom: 1rem;
  min-height: 260px;
  transition: transform 220ms ease, box-shadow 220ms ease;
}

.featured-blog-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 18px 38px rgba(15, 23, 42, 0.16);
}

.featured-blog-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
}

.topic-pill,
.meta-pill,
.level-pill,
.rating-pill,
.meta-badge {
  font-size: 0.73rem;
  font-weight: 700;
  padding: 0.26rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--line);
}

.topic-pill,
.level-pill {
  color: var(--brand);
  background: color-mix(in oklab, var(--brand) 15%, transparent);
}

.meta-pill,
.meta-badge {
  color: var(--text-muted);
  background: color-mix(in oklab, var(--surface) 92%, transparent);
}

.rating-pill {
  color: var(--text-muted);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
}

.featured-blog-card h3 {
  margin: 0.7rem 0 0;
  font-family: "Outfit", sans-serif;
  font-size: clamp(1.4rem, 2.4vw, 2rem);
  line-height: 1.15;
}

.featured-preview {
  margin: 0.75rem 0 0;
  color: var(--text-muted);
  font-size: 0.98rem;
}

.featured-rich-content {
  margin-top: 0.92rem;
  padding: 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  background: color-mix(in oklab, var(--surface) 88%, transparent);
  backdrop-filter: blur(14px);
}

.featured-actions {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.featured-media-shell {
  margin-top: 0.85rem;
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  overflow: hidden;
  background: color-mix(in oklab, var(--surface) 85%, transparent);
  backdrop-filter: blur(14px);
}

.featured-media-image,
.featured-media-video {
  display: block;
  width: 100%;
  max-height: 320px;
  object-fit: cover;
}

.featured-meta {
  margin-top: 0.9rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.options-title {
  margin: 0 0 0.65rem;
  font-family: "Outfit", sans-serif;
}

.blog-option-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 0.85rem;
}

.blog-option {
  grid-column: span 4;
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 0.82rem;
  background: color-mix(in oklab, var(--surface) 90%, transparent);
  backdrop-filter: blur(12px) saturate(112%);
  box-shadow: var(--shadow);
  text-align: left;
  color: inherit;
  cursor: pointer;
  transition: transform 170ms ease, border-color 170ms ease, box-shadow 170ms ease;
}

.blog-option:hover {
  transform: translateY(-2px);
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.14);
}

.blog-option.active {
  border-color: color-mix(in oklab, var(--brand) 65%, white);
}

.blog-option h4 {
  margin: 0;
  font-family: "Outfit", sans-serif;
  font-size: 1.03rem;
  line-height: 1.24;
}

.blog-option p {
  margin: 0.5rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.blog-option .meta-row {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
}

.split-promo {
  margin-top: 2.2rem;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.split-promo article {
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 0.95rem;
  background: color-mix(in oklab, var(--surface) 86%, transparent);
  backdrop-filter: blur(14px) saturate(112%);
  box-shadow: var(--shadow);
  transition: transform 200ms ease, box-shadow 200ms ease;
}

.split-promo article:hover {
  transform: translateY(-2px);
  box-shadow: 0 16px 34px rgba(15, 23, 42, 0.14);
}

.split-promo h3 {
  margin: 0.45rem 0 0;
  font-family: "Outfit", sans-serif;
}

.split-promo p {
  color: var(--text-muted);
}

.quiet-coming-note {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
  border: 1px dashed var(--line);
  border-radius: 0.85rem;
  padding: 0.75rem 0.9rem;
  background: color-mix(in oklab, var(--surface) 94%, transparent);
  max-width: 52ch;
}

.systems-map {
  margin-top: 2.2rem;
}

.systems-map-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.08fr) minmax(22rem, 0.92fr);
  gap: 1rem;
  align-items: stretch;
}

.workflow-panel,
.loop-panel {
  border: 1px solid var(--line);
  border-radius: 1.15rem;
  background: rgba(255, 255, 255, 0.58);
  background: color-mix(in oklab, var(--surface) 78%, transparent);
  backdrop-filter: blur(20px) saturate(116%);
  box-shadow: var(--shadow);
}

:root[data-theme="dark"] .workflow-panel,
:root[data-theme="dark"] .loop-panel {
  background: rgba(18, 18, 19, 0.64);
}

.workflow-panel {
  padding: 0.75rem;
  display: grid;
  gap: 0.65rem;
}

.workflow-card {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 0.9rem;
  align-items: start;
  min-height: 6.3rem;
  padding: 0.95rem;
  border: 1px solid color-mix(in oklab, var(--line) 76%, transparent);
  border-radius: 0.88rem;
  background: rgba(255, 255, 255, 0.5);
  background: color-mix(in oklab, var(--surface-strong) 58%, transparent);
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.workflow-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in oklab, var(--text-muted) 48%, var(--line));
  background: color-mix(in oklab, var(--surface-strong) 76%, transparent);
}

.workflow-index {
  width: 2.35rem;
  height: 2.35rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  display: inline-grid;
  place-items: center;
  color: var(--text-muted);
  background: color-mix(in oklab, var(--surface) 72%, transparent);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
}

.workflow-card h3,
.loop-panel h3 {
  margin: 0;
  font-family: "Outfit", sans-serif;
  line-height: 1.2;
}

.workflow-card h3 {
  font-size: 1.05rem;
}

.workflow-card p {
  margin: 0.35rem 0 0;
  color: var(--text-muted);
  font-size: 0.9rem;
}

.loop-panel {
  padding: 1rem;
  display: grid;
  align-content: center;
  gap: 0.9rem;
  overflow: hidden;
  position: relative;
}

.loop-panel::before {
  content: "";
  position: absolute;
  inset: -34% auto auto 38%;
  width: 18rem;
  height: 18rem;
  border-radius: 999px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.12), transparent 68%);
  pointer-events: none;
}

.panel-kicker {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.74rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.loop-panel h3 {
  max-width: 14ch;
  font-size: clamp(1.6rem, 3vw, 2.35rem);
}

.loop-diagram {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.42rem;
  margin: 0.25rem 0;
}

.loop-node {
  min-height: 5.45rem;
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  padding: 0.85rem;
  display: grid;
  align-content: center;
  gap: 0.28rem;
  background: color-mix(in oklab, var(--surface-strong) 70%, transparent);
}

.loop-node-core {
  outline: 1px solid color-mix(in oklab, var(--text) 24%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in oklab, var(--surface) 70%, transparent);
}

.loop-node strong {
  font-family: "Outfit", sans-serif;
  font-size: 1rem;
}

.loop-node span {
  color: var(--text-muted);
  font-size: 0.78rem;
}

.loop-rail {
  width: 1px;
  height: 1.25rem;
  margin-left: 1.2rem;
  background: var(--line-strong);
  position: relative;
}

.loop-rail::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: -0.08rem;
  width: 0.42rem;
  height: 0.42rem;
  border-bottom: 1px solid var(--line-strong);
  border-right: 1px solid var(--line-strong);
  transform: translateX(-50%) rotate(45deg);
}

.loop-copy {
  margin: 0;
  color: var(--text-muted);
  max-width: 46ch;
  font-size: 0.9rem;
}

.map-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 0.9rem;
}

.card {
  grid-column: span 4;
  border: 1px solid var(--line);
  border-radius: 1rem;
  padding: 0.95rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  display: grid;
  gap: 0.72rem;
  opacity: 1;
  transform: translateY(0);
}

.card h3 {
  margin: 0;
  font-family: "Outfit", sans-serif;
  font-size: 1.16rem;
  line-height: 1.2;
}

.card-description {
  margin: 0;
  color: var(--text-muted);
}

.rich-content {
  color: var(--text);
}

.rich-content > *:first-child {
  margin-top: 0;
}

.rich-content > *:last-child {
  margin-bottom: 0;
}

.rich-content p,
.rich-content ul,
.rich-content ol,
.rich-content blockquote,
.rich-content pre {
  margin: 0.62rem 0;
}

.rich-content h1,
.rich-content h2,
.rich-content h3,
.rich-content h4 {
  margin: 0.85rem 0 0.5rem;
  font-family: "Outfit", sans-serif;
  line-height: 1.2;
}

.rich-content h1 {
  font-size: clamp(1.36rem, 2vw, 1.8rem);
}

.rich-content h2 {
  font-size: clamp(1.2rem, 1.8vw, 1.52rem);
}

.rich-content h3 {
  font-size: clamp(1.08rem, 1.5vw, 1.32rem);
}

.rich-content ul,
.rich-content ol {
  padding-left: 1.25rem;
}

.rich-content li + li {
  margin-top: 0.35rem;
}

.rich-content blockquote {
  border-left: 3px solid color-mix(in oklab, var(--brand) 62%, transparent);
  padding-left: 0.75rem;
  color: var(--text-muted);
}

.rich-content a {
  color: var(--brand);
  text-decoration-thickness: 1.5px;
}

.rich-content code {
  font-family: "JetBrains Mono", "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
  font-size: 0.9em;
  padding: 0.12rem 0.32rem;
  border-radius: 0.38rem;
  border: 1px solid var(--line);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
}

.rich-content pre {
  overflow-x: auto;
  padding: 0.74rem 0.85rem;
  border-radius: 0.78rem;
  border: 1px solid var(--line);
  background: color-mix(in oklab, var(--surface) 88%, transparent);
}

.rich-content pre code {
  border: 0;
  background: transparent;
  padding: 0;
}

.reader-panel {
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1rem;
  display: grid;
  gap: 0.9rem;
}

.reader-breadcrumb {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.reader-hero-meta {
  margin-top: 0.95rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
}

.reader-media-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.75rem;
}

.reader-media-item {
  border: 1px solid var(--line);
  border-radius: 0.82rem;
  overflow: hidden;
  background: color-mix(in oklab, var(--surface) 92%, transparent);
  display: grid;
}

.reader-media-item img,
.reader-media-item video {
  display: block;
  width: 100%;
  max-height: 320px;
  object-fit: cover;
}

.reader-media-item > .btn {
  margin: 0.8rem;
}

.reader-section-title {
  margin: 0;
  font-family: "Outfit", sans-serif;
}

.reader-fallback {
  margin: 0;
  color: var(--text-muted);
}

.card-media-shell {
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  overflow: hidden;
  background: color-mix(in oklab, var(--surface) 92%, transparent);
}

.card-media-image,
.card-media-video {
  display: block;
  width: 100%;
  max-height: 180px;
  object-fit: cover;
}

.card-topline,
.card-footer,
.course-meta,
.launch-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  align-items: center;
}

.empty-state {
  grid-column: 1 / -1;
  text-align: center;
  border: 1px dashed var(--line);
  border-radius: 1rem;
  padding: 1.5rem;
  color: var(--text-muted);
  background: color-mix(in oklab, var(--surface) 92%, transparent);
}

.launch-roadmap {
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  padding: 1rem;
  margin-bottom: 0.9rem;
  background: var(--surface);
  box-shadow: var(--shadow);
}

.launch-roadmap h2,
.launch-roadmap h3 {
  margin: 0;
  font-family: "Outfit", sans-serif;
}

.launch-roadmap p {
  margin: 0.62rem 0 0;
  color: var(--text-muted);
}

.launch-cta {
  margin-top: 0.8rem;
}

.coming-soon-shell {
  border: 1px solid var(--line);
  border-radius: 1.2rem;
  padding: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.coming-soon-shell::before {
  content: "";
  position: absolute;
  inset: 0;
  background: repeating-linear-gradient(
    135deg,
    transparent 0 18px,
    color-mix(in oklab, var(--brand) 14%, transparent) 18px 20px
  );
  opacity: 0.35;
  pointer-events: none;
}

.coming-soon-banner {
  display: inline-flex;
  align-items: center;
  padding: 0.42rem 0.75rem;
  border-radius: 999px;
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--brand), var(--accent));
  color: #fff;
  margin-bottom: 0.8rem;
}

.problem-list {
  display: grid;
  gap: 0.6rem;
  position: relative;
}

.problem-item {
  border: 1px solid var(--line);
  border-radius: 0.9rem;
  background: color-mix(in oklab, var(--surface) 96%, transparent);
  padding: 0.85rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
}

.problem-item h3 {
  margin: 0;
  font-size: 1rem;
}

.problem-item p {
  margin: 0.25rem 0 0;
  color: var(--text-muted);
  font-size: 0.88rem;
}

.difficulty {
  font-size: 0.75rem;
  border-radius: 999px;
  padding: 0.25rem 0.55rem;
  font-weight: 700;
  border: 1px solid var(--line);
}

.difficulty.easy {
  color: var(--success);
}

.difficulty.medium {
  color: #f59e0b;
}

.difficulty.hard {
  color: var(--danger);
}

.admin-gate {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.auth-lock-mode .site-header,
.auth-lock-mode .hero,
.auth-lock-mode .admin-overview,
.auth-lock-mode .admin-builder-grid {
  display: none !important;
}

.auth-lock-mode .page-shell {
  width: 100%;
  min-height: 100vh;
  margin: 0;
  padding: 0;
  display: grid;
  place-items: center;
}

.auth-lock-mode .content-section {
  margin: 0;
  width: 100%;
  display: grid;
  place-items: center;
}

.auth-lock-mode .admin-gate {
  width: min(400px, 92vw);
  min-height: 190px;
  display: grid;
  align-content: center;
  justify-items: center;
  gap: 1rem;
  padding: 1.2rem;
}

.auth-lock-mode .admin-gate h2 {
  margin: 0;
}

.admin-gate h2 {
  margin: 0;
  font-family: "Outfit", sans-serif;
  font-size: 1.25rem;
}

.admin-gate p {
  margin: 0.4rem 0 0;
  color: var(--text-muted);
}

.admin-overview {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.85rem;
}

.admin-kpi {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1rem;
  display: grid;
  gap: 0.25rem;
}

.admin-kpi p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.86rem;
}

.admin-kpi strong {
  font-family: "Outfit", sans-serif;
  font-size: 1.9rem;
  line-height: 1.1;
}

.admin-kpi span {
  font-size: 0.86rem;
  color: var(--text-muted);
}

.admin-builder-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.95rem;
}

.admin-card {
  border: 1px solid var(--line);
  border-radius: 1rem;
  background: var(--surface);
  box-shadow: var(--shadow);
  padding: 1rem;
  display: grid;
  gap: 0.95rem;
  align-content: start;
}

.admin-card-wide {
  grid-column: 1 / -1;
}

.admin-card-header h2 {
  margin: 0.35rem 0 0;
  font-family: "Outfit", sans-serif;
  font-size: 1.45rem;
  line-height: 1.15;
}

.admin-form {
  display: grid;
  gap: 0.78rem;
}

.admin-form label {
  display: grid;
  gap: 0.3rem;
}

.admin-two-col {
  display: grid;
  gap: 0.75rem;
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.admin-checkbox {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  min-height: 2.55rem;
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: var(--surface);
  padding: 0 0.75rem;
}

.admin-checkbox input {
  min-height: auto;
  width: 1rem;
  height: 1rem;
}

.admin-checkbox span {
  font-size: 0.88rem;
  color: var(--text-muted);
}

.admin-markdown-label {
  border: 1px solid var(--line);
  border-radius: 0.85rem;
  padding: 0.65rem;
  background: color-mix(in oklab, var(--surface) 95%, transparent);
}

.admin-markdown-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.admin-markdown-preview {
  border: 1px solid var(--line);
  border-radius: 0.75rem;
  background: color-mix(in oklab, var(--surface) 91%, transparent);
  padding: 0.8rem;
  min-height: 7rem;
}

.admin-upload-stack {
  border: 1px dashed var(--line);
  border-radius: 0.8rem;
  padding: 0.62rem;
  background: color-mix(in oklab, var(--surface) 95%, transparent);
}

.admin-upload-controls {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  flex-wrap: wrap;
}

.admin-upload-controls input[type="file"] {
  min-height: auto;
  border: 1px solid var(--line);
  border-radius: 0.6rem;
  padding: 0.42rem 0.55rem;
  background: color-mix(in oklab, var(--surface) 94%, transparent);
}

.admin-upload-controls .btn {
  white-space: nowrap;
}

.admin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

.admin-list {
  display: grid;
  gap: 0.7rem;
}

.admin-list-row {
  border: 1px solid var(--line);
  border-radius: 0.95rem;
  background: color-mix(in oklab, var(--surface) 95%, transparent);
  padding: 0.82rem;
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.85rem;
}

.admin-list-main h3 {
  margin: 0;
  font-family: "Outfit", sans-serif;
  font-size: 1.07rem;
}

.admin-list-main p {
  margin: 0.35rem 0 0;
  color: var(--text-muted);
  font-size: 0.89rem;
}

.admin-row-meta {
  margin-top: 0.6rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.inline-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.42rem;
  justify-content: flex-end;
}

.status-pill {
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.24rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--line);
}

.status-pill.published {
  color: var(--success);
  background: color-mix(in oklab, var(--success) 14%, transparent);
}

.status-pill.draft {
  color: var(--brand);
  background: color-mix(in oklab, var(--brand) 15%, transparent);
}

.status-pill.archived {
  color: var(--text-muted);
  background: color-mix(in oklab, var(--surface) 90%, transparent);
}

.role-pill {
  font-size: 0.73rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.24rem 0.55rem;
  border-radius: 999px;
  border: 1px solid var(--line);
}

.role-pill.admin,
.role-pill.editor,
.role-pill.course_manager {
  color: var(--success);
  background: color-mix(in oklab, var(--success) 13%, transparent);
}

body.admin-shell {
  --brand: #6b7280;
  --accent: #9ca3af;
  --line: rgba(15, 23, 42, 0.14);
  --shadow: 0 10px 26px rgba(15, 23, 42, 0.08);
}

:root[data-theme="dark"] body.admin-shell {
  --bg: #0c0c0d;
  --surface: rgba(22, 22, 24, 0.94);
  --surface-strong: #141416;
  --text: #f5f5f7;
  --text-muted: #a1a1aa;
  --line: rgba(255, 255, 255, 0.12);
  --brand: #d4d4d8;
  --accent: #a1a1aa;
  --shadow: 0 14px 34px rgba(0, 0, 0, 0.45);
  --bg-grad-a: rgba(24, 24, 27, 0.42);
  --bg-grad-b: rgba(39, 39, 42, 0.36);
}

body.admin-shell .aurora {
  opacity: 0.08;
}

body.admin-shell .aurora-top {
  background: radial-gradient(circle, #6b7280, transparent 64%);
}

body.admin-shell .aurora-bottom {
  background: radial-gradient(circle, #52525b, transparent 64%);
}

body.admin-shell .site-header {
  border-bottom-color: var(--line);
}

body.admin-shell .site-header.scrolled {
  background: color-mix(in oklab, var(--surface-strong) 95%, transparent);
}

body.admin-shell .brand-icon {
  border-radius: 0.58rem;
}

body.admin-shell .hero h1,
body.admin-shell .hero h2 {
  letter-spacing: -0.02em;
}

body.admin-shell .eyebrow {
  color: var(--text-muted);
}

body.admin-shell .btn-primary {
  background: linear-gradient(180deg, #f3f4f6, #e5e7eb);
  color: #111827;
  box-shadow: none;
  border: 1px solid rgba(15, 23, 42, 0.16);
}

:root[data-theme="dark"] body.admin-shell .btn-primary {
  background: linear-gradient(180deg, #3f3f46, #27272a);
  color: #f5f5f7;
  border: 1px solid rgba(255, 255, 255, 0.18);
}

body.admin-shell .btn-secondary,
body.admin-shell .theme-toggle,
body.admin-shell .auth-user {
  background: color-mix(in oklab, var(--surface-strong) 96%, transparent);
}

body.admin-shell .admin-kpi,
body.admin-shell .admin-card,
body.admin-shell .admin-gate,
body.admin-shell .admin-list,
body.admin-shell .admin-list-row,
body.admin-shell input,
body.admin-shell select,
body.admin-shell textarea {
  border-radius: 0.75rem;
  box-shadow: none;
}

body.admin-shell .admin-kpi,
body.admin-shell .admin-card,
body.admin-shell .admin-gate {
  background: color-mix(in oklab, var(--surface-strong) 94%, transparent);
  border-color: var(--line);
}

body.admin-shell .admin-list-row {
  background: color-mix(in oklab, var(--surface-strong) 96%, transparent);
}

body.admin-shell .topic-pill,
body.admin-shell .meta-pill,
body.admin-shell .level-pill,
body.admin-shell .rating-pill,
body.admin-shell .meta-badge,
body.admin-shell .status-pill,
body.admin-shell .role-pill {
  color: var(--text-muted);
  border-color: var(--line);
  background: transparent;
}

.role-pill.student {
  color: var(--text-muted);
  background: color-mix(in oklab, var(--surface) 90%, transparent);
}

.auth-dialog {
  width: min(500px, 94vw);
  border: 1px solid var(--line);
  border-radius: 1.1rem;
  padding: 0;
  background: transparent;
}

.auth-dialog::backdrop {
  backdrop-filter: blur(6px);
  background: rgba(2, 7, 18, 0.45);
}

.auth-panel {
  background: var(--surface-strong);
  color: var(--text);
  border-radius: 1.1rem;
  padding: 1.15rem;
  display: grid;
  gap: 0.85rem;
  position: relative;
}

.auth-panel h2 {
  margin: 0 0 0.1rem;
  font-family: "Outfit", sans-serif;
  letter-spacing: 0.01em;
}

.auth-note {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: 0.8rem;
  padding: 0.7rem;
  background: color-mix(in oklab, var(--surface) 90%, transparent);
  color: var(--text-muted);
  font-size: 0.86rem;
}

.auth-panel label {
  display: grid;
  gap: 0.35rem;
}

.auth-panel input {
  min-height: 2.75rem;
}

.auth-panel .btn.wide {
  min-height: 2.75rem;
}

.close-dialog {
  position: absolute;
  right: 0.7rem;
  top: 0.7rem;
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
  border-radius: 0.55rem;
  width: 1.9rem;
  height: 1.9rem;
  cursor: pointer;
}

.auth-switch-copy {
  margin: 0.15rem 0 0;
  display: flex;
  align-items: center;
  gap: 0.38rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.text-btn {
  border: 0;
  background: transparent;
  color: var(--brand);
  font: inherit;
  font-weight: 700;
  cursor: pointer;
  padding: 0;
}

.form-feedback {
  min-height: 1.35rem;
  margin: 0;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.form-feedback.success {
  color: var(--success);
}

.form-feedback.error {
  color: var(--danger);
}

.auth-assist {
  display: flex;
  align-items: center;
}

.runtime-error-banner {
  position: fixed;
  left: 50%;
  bottom: 1rem;
  transform: translateX(-50%);
  z-index: 1200;
  width: min(820px, calc(100vw - 2rem));
  border: 1px solid color-mix(in oklab, var(--danger) 62%, transparent);
  background: color-mix(in oklab, var(--surface-strong) 90%, var(--danger) 10%);
  color: var(--text);
  border-radius: 0.8rem;
  padding: 0.65rem 0.85rem;
  font-size: 0.84rem;
  box-shadow: var(--shadow);
}

.reveal {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 650ms ease, transform 650ms ease;
}

:root.js-reveal .reveal {
  opacity: 1;
  transform: translateY(0);
}

:root.js-reveal .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 1080px) {
  .blog-option,
  .card {
    grid-column: span 6;
  }

  .systems-map-layout {
    grid-template-columns: 1fr;
  }

  .loop-panel {
    align-content: start;
  }
}

@media (max-width: 860px) {
  .site-header {
    display: grid;
    grid-template-columns: 1fr auto;
    row-gap: 0.6rem;
  }

  .nav-links {
    grid-column: 1 / -1;
    overflow-x: auto;
    padding-bottom: 0.12rem;
  }

  .header-actions {
    grid-column: 1 / -1;
    justify-content: flex-start;
    flex-wrap: wrap;
  }

  .section-heading {
    display: grid;
    gap: 0.45rem;
  }

  .reader-media-grid {
    grid-template-columns: 1fr;
  }

  .split-promo {
    grid-template-columns: 1fr;
  }

  .admin-overview,
  .admin-builder-grid,
  .admin-two-col {
    grid-template-columns: 1fr;
  }

  .admin-gate {
    flex-direction: column;
    align-items: flex-start;
  }

  .admin-list-row {
    flex-direction: column;
  }

  .inline-actions {
    justify-content: flex-start;
  }
}

@media (max-width: 680px) {
  .blog-option,
  .card {
    grid-column: 1 / -1;
  }

  .workflow-card {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .workflow-index {
    width: 2rem;
    height: 2rem;
  }

  .problem-item {
    flex-direction: column;
    align-items: flex-start;
  }

  .auth-switch-copy {
    flex-wrap: wrap;
  }

  .admin-upload-controls {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transition: none !important;
    scroll-behavior: auto !important;
  }
}