:root {
  --bg: #050814;
  --panel: #0d1024;
  --panel-alt: #0f1530;
  --border: rgba(255, 255, 255, 0.08);
  --accent-2: #ffc46a;
  --muted: #9fb0ff;
  --text: #e8edff;
}

html {
  background: var(--bg);
}

body {
  background: radial-gradient(circle at 20% 20%, #0f1a3d 0, transparent 30%),
    radial-gradient(circle at 80% 10%, #0c3650 0, transparent 24%),
    radial-gradient(circle at 40% 70%, #1b1645 0, transparent 24%), #050814;
  color: var(--text);
  font-family: "Source Sans 3", "Helvetica Neue", Arial, sans-serif;
}

/* Bulma sets titles to dark gray by default; override for our dark theme. */
.content {
  color: var(--text);
}

.content .title,
.content .subtitle,
.content h1,
.content h2,
.content h3,
.content h4,
.content h5,
.content h6 {
  color: #f7f9ff;
}

.title,
.subtitle {
  color: #f7f9ff;
}

strong {
  color: var(--muted);
}

a {
  color: var(--muted);
}

a:hover {
  color: #d9e2ff;
}

@keyframes slowDrift {
  0% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.35;
  }
  50% {
    transform: translate3d(12px, -10px, 0) scale(1.05);
    opacity: 0.45;
  }
  100% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.35;
  }
}

@keyframes heroKenBurns {
  0% {
    transform: translate3d(0, 0, 0) scale(1.04);
  }
  100% {
    transform: translate3d(-1%, -1%, 0) scale(1.08);
  }
}

@keyframes heroFloat {
  0% {
    transform: translate3d(0, 0, 0);
  }
  50% {
    transform: translate3d(0, -6px, 0);
  }
  100% {
    transform: translate3d(0, 0, 0);
  }
}

.navbar {
  background: rgba(5, 8, 20, 0.78) !important;
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 20px 45px rgba(0, 0, 0, 0.45);
  position: sticky;
  top: 0;
  z-index: 20;
  padding: 0.35rem 0;
}

@supports not (
  (-webkit-backdrop-filter: blur(0)) or (backdrop-filter: blur(0))
) {
  .navbar {
    background: rgba(5, 8, 20, 0.95) !important;
  }
}

.footer {
  display: none !important;
}

.navbar .navbar-brand .navbar-item {
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #f7f9ff !important;
}

.navbar a.navbar-item,
.navbar .navbar-item,
.navbar .navbar-link {
  color: var(--muted) !important;
  background: transparent !important;
  font-weight: 600;
  letter-spacing: -0.01em;
  position: relative;
  transition: color 0.2s ease, transform 0.2s ease;
  padding: 0.75rem 0.95rem;
}

/* Chapters modal */
.sdx-modal .modal-card {
  width: min(780px, calc(100vw - 2rem));
  background: radial-gradient(
      circle at 18% 22%,
      rgba(159, 176, 255, 0.14) 0,
      transparent 45%
    ),
    radial-gradient(
      circle at 88% 10%,
      rgba(255, 196, 106, 0.1) 0,
      transparent 40%
    ),
    linear-gradient(
      180deg,
      rgba(13, 16, 36, 0.96) 0%,
      rgba(7, 10, 26, 0.96) 100%
    );
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 35px 80px rgba(0, 0, 0, 0.62);
  overflow: hidden;
}

.sdx-modal .modal-card-head,
.sdx-modal .modal-card-foot {
  background: rgba(10, 12, 28, 0.8);
  border-color: rgba(255, 255, 255, 0.08);
}

.sdx-modal .modal-card-title {
  color: #f7f9ff;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.sdx-modal .modal-card-body {
  background: transparent;
}

.sdx-modal-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

@media (max-width: 768px) {
  .sdx-modal-grid {
    grid-template-columns: 1fr;
  }
}

.sdx-modal-box {
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 14px;
  background: rgba(13, 16, 36, 0.55);
  padding: 0.9rem 1rem;
}

.sdx-modal-links {
  display: grid;
  gap: 0.5rem;
  margin-top: 0.65rem;
}

.sdx-chapter-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.65rem 0.75rem;
  border-radius: 12px;
  border: 1px solid rgba(255, 255, 255, 0.08);
  background: rgba(255, 255, 255, 0.03);
  color: var(--text) !important;
  text-decoration: none !important;
  transition: background 0.2s ease, transform 0.2s ease, border-color 0.2s ease;
}

.sdx-chapter-link:hover {
  background: rgba(159, 176, 255, 0.1);
  border-color: rgba(159, 176, 255, 0.24);
  transform: translateY(-1px);
}

.sdx-chapter-link .sdx-kicker {
  color: var(--muted);
  font-weight: 700;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  font-size: 0.72rem;
}

.sdx-chapter-link .sdx-label {
  color: #f7f9ff;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.sdx-modal-hint {
  color: rgba(232, 237, 255, 0.78);
  margin-top: 0.75rem;
  font-size: 0.95rem;
}

.navbar .navbar-item::after,
.navbar .navbar-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0.4rem;
  width: 100%;
  height: 2px;
  background: linear-gradient(120deg, var(--muted), #d9e2ff);
  border-radius: 999px;
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.navbar .navbar-item:hover,
.navbar .navbar-link:hover {
  color: #f7f9ff !important;
  transform: translateY(-1px);
}

.navbar .navbar-item:hover::after,
.navbar .navbar-link:hover::after {
  opacity: 1;
  transform: translateY(0);
}

.navbar .navbar-item.is-active::after,
.navbar .navbar-link.is-active::after {
  opacity: 1;
  transform: translateY(0);
}

/* Hide theme hero so we can use our own. */
body > section.hero.is-primary {
  display: none !important;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

blockquote {
  margin: 1.2rem 0;
  padding: 1.05rem 1.2rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  border-left: 4px solid rgba(159, 176, 255, 0.7);
  background: radial-gradient(
      circle at 10% 20%,
      rgba(159, 176, 255, 0.12),
      transparent 55%
    ),
    radial-gradient(
      circle at 90% 10%,
      rgba(255, 196, 106, 0.12),
      transparent 45%
    ),
    rgba(13, 16, 36, 0.74);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.32);
  color: var(--text);
}

blockquote p {
  margin: 0.6rem 0;
}

/* Bulma styles `.content blockquote` with a light background; override it explicitly. */
.content blockquote {
  margin: 1.2rem 0;
  padding: 1.05rem 1.2rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  border-left: 4px solid rgba(159, 176, 255, 0.7);
  background: radial-gradient(
      circle at 10% 20%,
      rgba(159, 176, 255, 0.12),
      transparent 55%
    ),
    radial-gradient(
      circle at 90% 10%,
      rgba(255, 196, 106, 0.12),
      transparent 45%
    ),
    rgba(13, 16, 36, 0.74);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.32);
  color: var(--text);
}

.content blockquote strong,
blockquote strong {
  color: #f7f9ff;
}

.content table,
.sdx-panel table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  margin: 1rem 0;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: rgba(13, 16, 36, 0.72);
}

.content table th,
.content table td,
.sdx-panel table th,
.sdx-panel table td {
  padding: 0.65rem 0.8rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
  border-right: 1px solid rgba(255, 255, 255, 0.08);
  vertical-align: top;
}

.content table th:last-child,
.content table td:last-child,
.sdx-panel table th:last-child,
.sdx-panel table td:last-child {
  border-right: none;
}

.content table tr:last-child td,
.sdx-panel table tr:last-child td {
  border-bottom: none;
}

.content table th,
.sdx-panel table th {
  background: rgba(15, 21, 48, 0.75);
  color: var(--accent-2);
  font-weight: 700;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
}

.content table thead th,
.content table thead td,
.sdx-panel table thead th,
.sdx-panel table thead td {
  color: var(--accent-2);
}

.content table td,
.sdx-panel table td {
  color: var(--text);
}

.content table tr:nth-child(even) td,
.sdx-panel table tr:nth-child(even) td {
  background: rgba(13, 16, 36, 0.55);
}

.sdx-section {
  padding: 3rem 0 2.5rem;
}

.sdx-section.alt {
  background: rgba(13, 16, 36, 0.55);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 2.8rem;
  margin: 2.25rem 0;
}

.sdx-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.85rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: rgba(13, 16, 36, 0.6);
  font-weight: 600;
  color: var(--muted);
  font-size: 0.9rem;
}

.sdx-hero-panel {
  margin-top: -60px;
  background: radial-gradient(
      980px 420px at 10% 0%,
      rgba(159, 176, 255, 0.18),
      transparent 62%
    ),
    radial-gradient(
      900px 460px at 92% 10%,
      rgba(255, 196, 106, 0.12),
      transparent 58%
    ),
    linear-gradient(145deg, rgba(15, 21, 48, 0.92), rgba(13, 16, 36, 0.88));
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: 2.5rem;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45),
    inset 0 1px 0 rgba(255, 255, 255, 0.06);
  position: relative;
  overflow: hidden;
}

.sdx-hero-panel::before,
.sdx-hero-panel::after {
  content: "";
  position: absolute;
  width: 220px;
  height: 220px;
  border-radius: 50%;
  filter: blur(50px);
  opacity: 0.32;
  pointer-events: none;
}

.sdx-hero-panel::before {
  background: var(--muted);
  top: -80px;
  right: -80px;
  animation: slowDrift 18s ease-in-out infinite;
}

.sdx-hero-panel::after {
  background: var(--accent-2);
  bottom: -80px;
  left: -80px;
  animation: slowDrift 22s ease-in-out infinite reverse;
}

.sdx-hero-grid {
  display: grid;
  gap: 1.8rem;
  grid-template-columns: 1.1fr 0.9fr;
  align-items: center;
}

.sdx-hero-title {
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: clamp(2.65rem, 4vw, 3.45rem);
  line-height: 1.06;
  color: #f7f9ff;
  margin: 0.75rem 0;
  max-width: 26ch;
}

.sdx-hero-body {
  color: var(--text);
  opacity: 0.94;
  font-size: 1.1rem;
  line-height: 1.55;
  max-width: 58ch;
}

.sdx-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 1.6rem;
}

.sdx-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  padding: 0.85rem 1.25rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  user-select: none;
  -webkit-tap-highlight-color: transparent;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease,
    border-color 0.2s ease, color 0.2s ease;
}

.sdx-btn:hover {
  transform: translateY(-1px);
}

.sdx-btn:active {
  transform: translateY(0);
}

.sdx-btn:focus-visible {
  outline: 2px solid rgba(255, 196, 106, 0.9);
  outline-offset: 3px;
}

.sdx-btn:visited,
.sdx-btn:hover {
  color: var(--text);
}

.sdx-btn-primary {
  background: linear-gradient(120deg, var(--muted), #d9e2ff);
  color: #041022;
  box-shadow: 0 12px 30px rgba(159, 176, 255, 0.25);
  border: none;
}

.sdx-btn-primary:visited,
.sdx-btn-primary:hover {
  color: #041022;
}

.sdx-btn-primary:hover {
  box-shadow: 0 16px 42px rgba(159, 176, 255, 0.32);
}

.sdx-btn-ghost {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
}

.sdx-btn-ghost:visited,
.sdx-btn-ghost:hover {
  color: var(--text);
}

.sdx-btn-ghost:hover {
  background: rgba(217, 226, 255, 0.08);
  border-color: rgba(217, 226, 255, 0.22);
}

@media (prefers-reduced-motion: reduce) {
  .sdx-hero-panel::before,
  .sdx-hero-panel::after,
  .sdx-hero-media-img,
  .sdx-hero-media-card {
    animation: none !important;
  }
}

@media (prefers-reduced-motion: no-preference) {
  .sdx-hero-media-img {
    animation: heroKenBurns 18s ease-in-out infinite alternate;
  }

  .sdx-hero-media-card {
    animation: heroFloat 7.5s ease-in-out infinite;
  }
}

.sdx-back-to-top {
  position: fixed;
  right: 1.25rem;
  bottom: 1.25rem;
  z-index: 40;
  width: 46px;
  height: 46px;
  display: grid;
  place-items: center;
  border-radius: 14px;
  border: 1px solid var(--border);
  background: rgba(13, 16, 36, 0.78);
  color: var(--text);
  box-shadow: 0 18px 45px rgba(0, 0, 0, 0.45);
  cursor: pointer;
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  opacity: 0;
  pointer-events: none;
  transform: translateY(10px) scale(0.98);
  transition: opacity 0.2s ease, transform 0.2s ease, border-color 0.2s ease,
    background 0.2s ease, box-shadow 0.2s ease, color 0.2s ease;
}

.sdx-back-to-top::after {
  content: "Back to top";
  position: absolute;
  right: calc(100% + 0.75rem);
  top: 50%;
  transform: translateY(-50%) translateX(10px);
  padding: 0.35rem 0.6rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(13, 16, 36, 0.9);
  color: var(--text);
  font-weight: 700;
  letter-spacing: 0.02em;
  font-size: 0.8rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
}

.sdx-back-to-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: none;
}

.sdx-back-to-top:hover {
  border-color: rgba(159, 176, 255, 0.45);
  color: #f7f9ff;
  box-shadow: 0 22px 55px rgba(0, 0, 0, 0.55);
  transform: translateY(-2px);
}

.sdx-back-to-top:hover::after,
.sdx-back-to-top:focus-visible::after {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

.sdx-back-to-top:focus-visible {
  outline: 2px solid rgba(255, 196, 106, 0.9);
  outline-offset: 3px;
}

.sdx-back-to-top svg {
  width: 20px;
  height: 20px;
  transition: transform 0.2s ease;
}

.sdx-back-to-top:hover svg {
  transform: translateY(-1px);
}

.sdx-hero-badge {
  display: grid;
  gap: 1rem;
  padding: 1.4rem;
  border-radius: 16px;
  background: rgba(13, 16, 36, 0.72);
  border: 1px solid var(--border);
}

.sdx-hero-badge h4 {
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  margin: 0;
  color: #f7f9ff;
}

.sdx-hero-media {
  position: relative;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  min-height: 380px;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.45);
  background: rgba(13, 16, 36, 0.72);
}

.sdx-hero-media-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform: translate3d(0, 0, 0) scale(1.04);
  will-change: transform;
  filter: saturate(1.05) contrast(1.05);
}

.sdx-hero-media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(5, 8, 20, 0.22),
    rgba(5, 8, 20, 0.86) 66%
  );
  z-index: 0;
}

.sdx-hero-media-overlay {
  position: absolute;
  inset: 0;
  padding: 1.25rem;
  display: flex;
  align-items: flex-end;
  z-index: 1;
}

.sdx-hero-media-card {
  width: 100%;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(13, 16, 36, 0.78);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.32);
  padding: 1.15rem 1.15rem 1.1rem;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.sdx-hero-media-card h4 {
  margin: 0;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #f7f9ff;
}

.sdx-hero-media-card p {
  margin: 0.55rem 0 0;
  color: var(--text);
}

.sdx-hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.sdx-hero-media-card .sdx-note {
  margin: 0.8rem 0 0;
}

.sdx-hero-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(120px, 1fr));
  gap: 0.75rem;
}

.sdx-mini-stat {
  border-radius: 12px;
  border: 1px solid var(--border);
  padding: 0.8rem 0.9rem;
  background: rgba(15, 21, 48, 0.65);
}

.sdx-mini-stat .label {
  font-size: 0.85rem;
  color: var(--muted);
}

.sdx-mini-stat .value {
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-size: 1.4rem;
  color: #f7f9ff;
}

.sdx-panel,
.sdx-card {
  background: rgba(13, 16, 36, 0.72);
  border: 1px solid var(--border);
  border-radius: 18px;
  padding: 1.5rem;
  height: 100%;
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.sdx-panel {
  height: auto;
}

.sdx-panel + .sdx-panel {
  margin-top: 1.25rem;
}

.sdx-panel:hover,
.sdx-card:hover {
  transform: translateY(-4px);
  border-color: rgba(159, 176, 255, 0.45);
  box-shadow: 0 22px 50px rgba(0, 0, 0, 0.35);
}

.sdx-grid-cards {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.sdx-formula-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 1.1rem;
}

.sdx-formula-grid.sdx-formula-grid-core .sdx-formula-card:last-child {
  grid-column: 1 / -1;
}

.sdx-step-grid {
  display: grid;
  gap: 1rem;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.25rem;
}

.sdx-step-card {
  border-radius: 16px;
  padding: 1.2rem 1.25rem;
  background: linear-gradient(
    150deg,
    rgba(159, 176, 255, 0.07),
    rgba(255, 196, 106, 0.08)
  );
  border: 1px solid var(--border);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
  position: relative;
  overflow: hidden;
}

.sdx-step-card::after {
  content: "";
  position: absolute;
  inset: -40% -20% auto auto;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: rgba(159, 176, 255, 0.08);
  filter: blur(30px);
  pointer-events: none;
}

.sdx-step-head {
  display: flex;
  align-items: center;
  gap: 0.7rem;
}

.sdx-step-num {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.14);
  background: rgba(5, 8, 20, 0.55);
  color: #f7f9ff;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
}

.sdx-step-card .title {
  margin: 0;
}

.sdx-step-card p {
  margin: 0.65rem 0 0;
  color: var(--muted);
}

.sdx-formula-card {
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: 16px;
  padding: 1rem 1.1rem;
  background: rgba(13, 16, 36, 0.78);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.32);
  position: relative;
  overflow: hidden;
}

.sdx-formula-card::after {
  content: "";
  position: absolute;
  width: 90px;
  height: 90px;
  top: -35px;
  right: -35px;
  border-radius: 50%;
  background: rgba(159, 176, 255, 0.12);
  filter: blur(22px);
}

.sdx-formula-card h4 {
  margin: 0;
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--accent-2);
}

.sdx-formula-card .formula {
  margin-top: 0.55rem;
  padding: 0.65rem 0.8rem;
  border-radius: 14px;
  background: rgba(5, 8, 20, 0.55);
  border: 1px solid var(--border);
  color: #f7f9ff;
  text-align: center;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -ms-overflow-style: none;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
}

.sdx-panel[id^="chapter-"] {
  padding: 2rem;
}
.sdx-panel[id^="chapter-"] + .sdx-panel[id^="chapter-"] {
  margin-top: 2.5rem;
}

.sdx-chapter-hero {
  position: relative;
  margin: 1.15rem 0 1.6rem;
  height: 240px;
  border-radius: 18px;
  overflow: hidden;
  border: 1px solid var(--border);
  background: rgba(13, 16, 36, 0.55);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.28);
}

.sdx-chapter-hero-img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  transform: scale(1.06);
  opacity: 0.32;
  filter: saturate(1.05) contrast(1.06);
}

.sdx-chapter-hero--top .sdx-chapter-hero-img {
  object-position: center top;
}

.sdx-chapter-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
      circle at 18% 20%,
      rgba(159, 176, 255, 0.22),
      transparent 55%
    ),
    radial-gradient(
      circle at 82% 10%,
      rgba(255, 196, 106, 0.18),
      transparent 55%
    ),
    linear-gradient(180deg, rgba(5, 8, 20, 0.25), rgba(5, 8, 20, 0.95) 82%);
  pointer-events: none;
}

.sdx-chapter-hero-caption {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  gap: 0.25rem;
  padding: 1rem 1.1rem;
}

.sdx-chapter-hero-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  font-size: 0.72rem;
  color: rgba(232, 237, 255, 0.82);
}

.sdx-chapter-hero-title {
  margin: 0;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1.15rem;
  color: #f7f9ff;
}

@media (max-width: 980px) {
  .sdx-chapter-hero {
    height: 200px;
  }
}

.sdx-formula-card .formula::-webkit-scrollbar {
  width: 0;
  height: 0;
}

.sdx-formula-card .formula mjx-container {
  overflow: visible !important;
}

.sdx-formula-card p {
  margin: 0.55rem 0 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.sdx-list {
  padding-left: 1.1rem;
  margin: 0.6rem 0;
}

.sdx-list li {
  padding: 0.12rem 0;
}

.sdx-case-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: stretch;
  gap: 1rem;
  margin-top: 1.25rem;
  margin-bottom: 1.5rem;
}

@media (min-width: 768px) {
  .sdx-case-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.15rem;
  }
}

@media (min-width: 980px) {
  .sdx-case-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .sdx-case-grid .sdx-case-card {
    grid-column: span 2;
  }

  .sdx-case-grid .sdx-case-card-wide {
    grid-column: span 3;
  }
}

.sdx-case-grid + .sdx-panel {
  margin-top: 1.25rem;
}

.sdx-case-card {
  border-radius: 16px;
  padding: 1.3rem 1.4rem;
  background: linear-gradient(
    150deg,
    rgba(159, 176, 255, 0.08),
    rgba(255, 196, 106, 0.09)
  );
  border: 1px solid var(--border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.75rem;
  position: relative;
  overflow: hidden;
}

.sdx-case-card .title {
  margin: 0;
}

.sdx-case-card p {
  margin: 0;
}

.sdx-case-card .sdx-note {
  margin-top: auto;
  margin-bottom: 0.2rem;
}

.sdx-case-card-wide {
  /* grid span set in media query above */
}

.sdx-case-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.sdx-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
  background: rgba(13, 16, 36, 0.55);
}

.sdx-chart-block {
  margin: 1.5rem 0 1.25rem;
  padding: 1.6rem;
  border-radius: 16px;
  background: radial-gradient(
      circle at 10% 20%,
      rgba(159, 176, 255, 0.12),
      transparent 55%
    ),
    radial-gradient(
      circle at 90% 10%,
      rgba(255, 196, 106, 0.14),
      transparent 45%
    ),
    rgba(13, 16, 36, 0.7);
  border: 1px solid var(--border);
  position: relative;
  box-sizing: border-box;
  overflow: hidden;
}

.sdx-embed-block {
  margin: 1.75rem 0 1.75rem;
}

.sdx-embed-block.is-tight {
  margin-bottom: 0.85rem;
}

.sdx-embed-stack {
  display: grid;
  gap: 1.35rem;
}

.sdx-embed-subbox {
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-radius: 14px;
  padding: 0.55rem;
  background: rgba(5, 8, 20, 0.18);
}

.sdx-embed-subbox iframe {
  border-radius: 12px;
}

.sdx-embed-explain {
  padding: 1.05rem 1.1rem;
  background: radial-gradient(
      circle at 22% 18%,
      rgba(159, 176, 255, 0.1),
      transparent 62%
    ),
    rgba(5, 8, 20, 0.18);
}

.sdx-embed-explain p {
  margin: 0;
  max-width: 68ch;
  margin-left: auto;
  margin-right: auto;
  text-align: center;
  color: rgba(232, 237, 255, 0.9);
  line-height: 1.55;
}

.sdx-embed-explain p + p {
  margin-top: 0.75rem;
}

.sdx-embed-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.35rem;
  align-items: stretch;
}

.sdx-embed-card {
  border-radius: 18px;
  border: 1px solid var(--border);
  background: rgba(13, 16, 36, 0.68);
  box-shadow: 0 16px 40px rgba(0, 0, 0, 0.3);
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
}

.sdx-embed-card:hover {
  transform: translateY(-2px);
  border-color: rgba(159, 176, 255, 0.32);
  box-shadow: 0 20px 50px rgba(0, 0, 0, 0.36);
}

.sdx-embed-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 0.9rem;
  background: rgba(5, 8, 20, 0.12);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.sdx-embed-title {
  margin: 0;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: 1rem;
  color: #f7f9ff;
}

.sdx-embed-kicker {
  color: rgba(232, 237, 255, 0.8);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 0.72rem;
  white-space: nowrap;
}

.sdx-embed-body {
  padding: 0.55rem;
  background: rgba(5, 8, 20, 0.28);
}

.sdx-embed-body iframe {
  width: 100%;
  height: 780px;
  display: block;
  border: 0;
  overflow: hidden;
  border-radius: 14px;
  background: rgba(13, 16, 36, 0.55);
}

.sdx-embed-media {
  border-radius: 14px;
  overflow: hidden;
  background: rgba(13, 16, 36, 0.55);
}

.sdx-embed-media .flourish-embed {
  margin: 0 !important;
}

.sdx-embed-media iframe {
  width: 100% !important;
  border: 0;
  display: block;
}

.sdx-formula-block {
  background: rgba(13, 16, 36, 0.82);
}

.sdx-placeholder {
  border-style: dashed;
  border-color: rgba(159, 176, 255, 0.45);
}

.sdx-window-visual {
  margin-top: 1.15rem;
  border-radius: 16px;
  border: 1px solid var(--border);
  background: radial-gradient(
      circle at 20% 20%,
      rgba(159, 176, 255, 0.1),
      transparent 55%
    ),
    rgba(5, 8, 20, 0.35);
  padding: 1.1rem 1.1rem 0.9rem;
  overflow: hidden;
}

.sdx-window-svg {
  width: 100%;
  height: auto;
  display: block;
}

.sdx-window-axis {
  stroke: rgba(255, 255, 255, 0.24);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 1200;
  stroke-dashoffset: 1200;
}

.sdx-window-tick {
  stroke: rgba(255, 255, 255, 0.2);
  stroke-width: 2;
  opacity: 0.9;
}

.sdx-window-label {
  fill: rgba(232, 237, 255, 0.92);
  font-size: 14px;
  font-weight: 600;
  opacity: 0;
}

.sdx-window-label-muted {
  fill: rgba(159, 176, 255, 0.95);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.sdx-window-pre,
.sdx-window-post {
  stroke-width: 1;
  opacity: 0;
  transform: scaleX(0);
  transform-box: fill-box;
}

.sdx-window-pre {
  fill: rgba(159, 176, 255, 0.16);
  stroke: rgba(159, 176, 255, 0.42);
  transform-origin: 100% 50%;
}

.sdx-window-post {
  fill: rgba(78, 205, 196, 0.14);
  stroke: rgba(78, 205, 196, 0.38);
  transform-origin: 0% 50%;
}

.sdx-window-event {
  stroke: rgba(255, 196, 106, 0.95);
  stroke-width: 4;
  stroke-linecap: round;
  stroke-dasharray: 300;
  stroke-dashoffset: 300;
  opacity: 0;
}

.sdx-window-glow {
  fill: rgba(255, 196, 106, 0.85);
  opacity: 0;
}

.sdx-window-glow-soft {
  fill: rgba(255, 196, 106, 0.2);
  filter: blur(10px);
  opacity: 0;
}

.sdx-window-steps {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0.9rem;
  margin-top: 1.1rem;
}

.sdx-window-step {
  border-radius: 16px;
  border: 1px solid var(--border);
  background: rgba(13, 16, 36, 0.62);
  padding: 1rem 1.05rem;
  opacity: 0;
  transform: translateY(10px);
}

.sdx-window-step h4 {
  margin: 0;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-size: 0.95rem;
  letter-spacing: 0.01em;
}

.sdx-window-step p {
  margin: 0.55rem 0 0;
  color: var(--text);
  font-size: 0.95rem;
}

.sdx-window-step .sdx-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  margin-bottom: 0.55rem;
  padding: 0.25rem 0.7rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  font-weight: 700;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.sdx-window-step-pre .sdx-chip {
  color: rgba(159, 176, 255, 0.95);
  background: rgba(159, 176, 255, 0.1);
}

.sdx-window-step-event .sdx-chip {
  color: rgba(255, 196, 106, 0.95);
  background: rgba(255, 196, 106, 0.1);
}

.sdx-window-step-post .sdx-chip {
  color: rgba(78, 205, 196, 0.9);
  background: rgba(78, 205, 196, 0.09);
}

.sdx-window-block.animate-in .sdx-window-axis {
  animation: sdxDrawAxis 1.2s ease forwards;
}

.sdx-window-block.animate-in .sdx-window-pre {
  opacity: 1;
  animation: sdxGrowBand 1s ease 0.75s forwards;
}

.sdx-window-block.animate-in .sdx-window-event {
  opacity: 1;
  animation: sdxDrawEvent 0.75s ease 1.55s forwards;
}

.sdx-window-block.animate-in .sdx-window-post {
  opacity: 1;
  animation: sdxGrowBand 1s ease 2s forwards;
}

.sdx-window-block.animate-in .sdx-window-glow,
.sdx-window-block.animate-in .sdx-window-glow-soft {
  opacity: 1;
  animation: sdxPopGlow 0.8s ease 1.65s both;
}

.sdx-window-block.animate-in .sdx-window-label {
  animation: sdxFadeIn 0.7s ease 2.55s forwards;
}

.sdx-window-block.animate-in .sdx-window-step:nth-child(1) {
  animation: sdxPopStep 0.7s ease 2.9s forwards;
}

.sdx-window-block.animate-in .sdx-window-step:nth-child(2) {
  animation: sdxPopStep 0.7s ease 3.15s forwards;
}

.sdx-window-block.animate-in .sdx-window-step:nth-child(3) {
  animation: sdxPopStep 0.7s ease 3.4s forwards;
}

@keyframes sdxDrawAxis {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes sdxGrowBand {
  to {
    transform: scaleX(1);
  }
}

@keyframes sdxDrawEvent {
  to {
    stroke-dashoffset: 0;
  }
}

@keyframes sdxPopGlow {
  0% {
    transform: scale(0.85);
  }
  55% {
    transform: scale(1.08);
  }
  100% {
    transform: scale(1);
  }
}

@keyframes sdxFadeIn {
  to {
    opacity: 1;
  }
}

@keyframes sdxPopStep {
  to {
    opacity: 1;
    transform: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .sdx-window-axis,
  .sdx-window-event {
    stroke-dasharray: none;
    stroke-dashoffset: 0;
  }
  .sdx-window-pre,
  .sdx-window-post {
    opacity: 1;
    transform: none;
  }
  .sdx-window-label,
  .sdx-window-step {
    opacity: 1;
    transform: none;
    animation: none !important;
  }
}

.sdx-dual-panel {
  display: grid;
  grid-template-columns: minmax(0, 0.7fr) minmax(0, 0.3fr);
  gap: 1.25rem;
  margin-top: 1.2rem;
  align-items: start;
}

.sdx-dual-panel .sdx-chart-block {
  margin: 0;
}

.sdx-note {
  color: var(--muted);
  font-size: 0.9rem;
  margin-top: 0.8rem;
}

/* Scroll-triggered reveal animations */
[data-animate] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.35s ease, transform 0.35s ease;
  will-change: opacity, transform;
}

[data-animate="scale"] {
  transform: scale(0.97);
}

[data-animate].animate-in {
  opacity: 1;
  transform: none;
}

@media (max-width: 980px) {
  .sdx-hero-grid,
  .sdx-dual-panel {
    grid-template-columns: 1fr;
  }

  .sdx-formula-grid {
    grid-template-columns: 1fr;
  }

  .sdx-step-grid {
    grid-template-columns: 1fr;
  }

  .sdx-case-grid {
    justify-content: stretch;
    margin-bottom: 1.25rem;
  }

  .sdx-case-grid .sdx-case-card {
    max-width: none;
  }

  .sdx-hero-media {
    min-height: 300px;
  }

  .sdx-section.alt {
    padding: 1.9rem;
    margin: 1.35rem 0;
  }

  .sdx-embed-grid {
    grid-template-columns: 1fr;
  }

  .sdx-window-steps {
    grid-template-columns: 1fr;
  }
}

/* About: layout spacing + team */
.sdx-hero-panel--spaced {
  margin-bottom: 1.5rem;
}

.sdx-team-panel {
  padding: 1.85rem;
}

.sdx-team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  align-items: stretch;
  gap: 1.15rem;
  margin-top: 1.35rem;
}

@media (min-width: 768px) {
  .sdx-team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.2rem;
  }
}

@media (min-width: 980px) {
  .sdx-team-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .sdx-team-grid .sdx-team-card {
    grid-column: span 2;
  }

  .sdx-team-grid .sdx-team-card-wide {
    grid-column: span 3;
  }
}

.sdx-team-card {
  display: flex;
  align-items: center;
  gap: 1.15rem;
  padding: 1.35rem 1.45rem;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: radial-gradient(
      circle at 10% 20%,
      rgba(159, 176, 255, 0.14),
      transparent 60%
    ),
    linear-gradient(
      150deg,
      rgba(159, 176, 255, 0.08),
      rgba(255, 196, 106, 0.09)
    );
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
  min-height: 118px;
}

.sdx-team-card:hover {
  transform: translateY(-4px);
  border-color: rgba(159, 176, 255, 0.28);
  box-shadow: 0 24px 60px rgba(0, 0, 0, 0.35);
}

.sdx-team-avatar {
  width: 160px;
  height: 160px;
  border-radius: 999px;
  object-fit: cover;
  border: 1px solid rgba(255, 255, 255, 0.12);
  background: rgba(5, 8, 20, 0.35);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.35);
  flex: 0 0 auto;
}

@media (max-width: 768px) {
  .sdx-team-avatar {
    width: 120px;
    height: 120px;
  }
}

@media (max-width: 420px) {
  .sdx-team-avatar {
    width: 96px;
    height: 96px;
  }
}

.sdx-team-meta {
  min-width: 0;
}

.sdx-team-name {
  margin: 0;
  font-family: "Space Grotesk", "Source Sans 3", sans-serif;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: #f7f9ff;
  font-size: 1.15rem;
  line-height: 1.2;
}

.sdx-team-role {
  margin: 0.2rem 0 0;
  color: rgba(159, 176, 255, 0.95);
  font-size: 0.96rem;
  line-height: 1.4;
}