/* ─── GOOGLE FONTS ───────────────────────────────────────── */
@import url("https://fonts.googleapis.com/css2?family=Oxanium:wght@400;600;700;800&family=Spectral:ital,wght@0,400;0,600;0,700;0,800;1,400;1,600&family=Plus+Jakarta+Sans:wght@400;500;600;700&family=JetBrains+Mono:wght@400;500;600;700&family=DM+Sans:wght@300;400;500&display=swap");

/* ─── RESET ──────────────────────────────────────────────── */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

/* ─── DESIGN ──────────────────────────────────────── */
:root {
  --blue-950: #060f24;
  --blue-900: #0a1628;
  --blue-800: #0f2044;
  --blue-700: #1a3a6b;
  --blue-600: #1e4d9b;
  --blue-500: #2563eb;
  --blue-400: #3b82f6;
  --blue-300: #93c5fd;
  --blue-100: #dbeafe;
  --blue-50: #eff6ff;
  --white: #ffffff;
  --gray-50: #f8fafc;
  --gray-100: #f1f5f9;
  --gray-200: #e2e8f0;
  --gray-300: #cbd5e1;
  --gray-400: #94a3b8;
  --gray-500: #64748b;
  --gray-600: #475569;
  --gray-800: #1e293b;
  --font-display: "Oxanium", sans-serif;
  --font-heading: "Spectral", Georgia, serif;
  --font-sub: "Plus Jakarta Sans", sans-serif;
  --font-body: "DM Sans", sans-serif;
  --font-mono: "JetBrains Mono", "Courier New", monospace;
}

/* ─── BASE ───────────────────────────────────────────────── */
html {
  scroll-behavior: smooth;
  /* Offset anchor scroll targets below fixed navbar */
  scroll-padding-top: 90px;
}

body {
  font-family: var(--font-body);
  background: var(--white);
  color: var(--gray-800);
  overflow-x: hidden;
}

/* ─── NAVBAR ─────────────────────────────────────────────── */
nav#navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto auto;
  align-items: center;
  justify-content: stretch;
  padding: 8px 52px;
  background: transparent;
  transition:
    transform 0.28s ease,
    background 0.4s,
    backdrop-filter 0.4s,
    border-color 0.4s,
    box-shadow 0.4s;
}

nav#navbar.nav-hidden {
  transform: translateY(-110%);
}

nav#navbar.scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(22px);
  -webkit-backdrop-filter: blur(22px);
  border-bottom: 1px solid rgba(37, 99, 235, 0.08);
  box-shadow: 0 4px 24px rgba(37, 99, 235, 0.06);
}

.nav-logo {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-logo img {
  display: block;
  max-width: 100px;
  width: 100%;
  height: auto;
}

/* ─── DESKTOP NAV LINKS ──────────────────────────────────── */
.nav-links {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 2px;
  flex: 1;
  min-width: 0;
  overflow: visible;
  scrollbar-width: none;
  -ms-overflow-style: none;
  padding: 0 8px;
}

.nav-links::-webkit-scrollbar {
  display: none;
}

.nav-links.is-overflowing {
  justify-content: flex-start;
}

.nav-links > * {
  flex: 0 0 auto;
}

.nav-links > * + * {
  position: relative;
  margin-left: 8px;
  padding-left: 12px;
}

.nav-links > * + *::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 1px;
  height: 16px;
  background: rgba(37, 99, 235, 0.18);
}

/* Wrapper for items that may have a dropdown */
.nav-item-wrap {
  position: relative;
}

/* Hover bridge — prevents dropdown closing when mouse travels toward it */
.nav-item-wrap::after {
  content: "";
  position: absolute;
  top: 100%;
  left: -4px;
  right: -10px;
  height: 16px;
}

.nav-link {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  padding: 7px 12px;
  border-radius: 50px;
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  color: var(--gray-600);
  text-decoration: none;
  transition: all 0.2s;
  white-space: nowrap;
  cursor: pointer;
  background: none;
  border: none;
}

.nav-link.active {
  background: var(--blue-500);
  color: var(--white);
}
.nav-link:not(.active):hover {
  color: var(--blue-500);
  background: var(--blue-50);
}

.nav-chevron {
  font-size: 8px;
  display: inline-block;
  transition: transform 0.22s ease;
  opacity: 0.7;
}

.nav-item-wrap:hover .nav-chevron,
.nav-item-wrap:focus-within .nav-chevron {
  transform: rotate(180deg);
}

/* CTA button */
.nav-cta {
  padding: 8px 12px;
  border-radius: 50px;
  background: transparent;
  border: 1.5px solid var(--blue-500);
  color: var(--blue-500);
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
  flex-shrink: 0;
  text-decoration: none;
  margin-left: 16px;
}

.nav-cta:hover {
  background: var(--blue-500);
  color: var(--white);
}

/* ─── DROPDOWN PANEL ─────────────────────────────────────── */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 14px);
  left: 50%;
  transform: translateX(-50%) translateY(-8px);
  width: max-content;
  min-width: 200px;
  max-width: 260px;
  background: rgba(255, 255, 255, 0.99);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(37, 99, 235, 0.1);
  border-radius: 18px;
  box-shadow:
    0 20px 60px rgba(37, 99, 235, 0.13),
    0 4px 16px rgba(0, 0, 0, 0.05);
  padding: 8px;
  z-index: 2000;
  max-height: 72vh;
  overflow-y: auto;
  overscroll-behavior: contain;
  /* Hidden state */
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0s linear 0.2s;
}

.nav-item-wrap:hover .nav-dropdown,
.nav-item-wrap:focus-within .nav-dropdown {
  visibility: visible;
  opacity: 1;
  pointer-events: all;
  transform: translateX(-50%) translateY(0);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0s;
}

/* Section group inside dropdown */
.dd-group {
  margin-bottom: 2px;
}
.dd-group:last-child {
  margin-bottom: 0;
}

.dd-group-header {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 12px 8px;
  border-radius: 10px;
  text-decoration: none;
  transition: background 0.15s;
}

.dd-group-header:hover {
  background: var(--blue-50);
}

.dd-num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--blue-500);
  background: var(--blue-50);
  border: 1px solid rgba(37, 99, 235, 0.15);
  padding: 2px 8px;
  border-radius: 50px;
  flex-shrink: 0;
  white-space: nowrap;
}

.dd-title {
  font-family: var(--font-sub);
  font-size: 13px;
  font-weight: 600;
  color: var(--blue-900);
  flex: 1;
}

.dd-arrow {
  font-size: 13px;
  color: var(--blue-400);
  opacity: 0;
  transform: translateX(-4px);
  transition:
    opacity 0.15s,
    transform 0.15s;
}

.dd-group-header:hover .dd-arrow {
  opacity: 1;
  transform: translateX(0);
}

.dd-subs {
  padding: 2px 0 6px 12px;
  border-left: 1px solid var(--gray-100);
  margin-left: 20px;
  margin-bottom: 4px;
}

.dd-sub {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 5px 10px;
  border-radius: 7px;
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 12px;
  color: var(--gray-500);
  transition:
    background 0.13s,
    color 0.13s;
}

.dd-sub:hover {
  background: var(--blue-50);
  color: var(--blue-600);
}

.dd-sub-num {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 500;
  color: var(--gray-400);
  min-width: 26px;
  flex-shrink: 0;
}

.dd-divider {
  height: 1px;
  background: var(--gray-100);
  margin: 6px 6px;
}

/* ─── HAMBURGER BUTTON ───────────────────────────────────── */
.nav-hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 36px;
  height: 36px;
  padding: 6px;
  background: none;
  border: none;
  cursor: pointer;
  border-radius: 8px;
  transition: background 0.2s;
  flex-shrink: 0;
  z-index: 1001;
}

.nav-hamburger:hover {
  background: var(--gray-100);
}

.nav-hamburger span {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--gray-600);
  border-radius: 2px;
  transition:
    transform 0.28s ease,
    opacity 0.2s ease;
  transform-origin: center;
}

nav#navbar.menu-open .nav-hamburger span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}
nav#navbar.menu-open .nav-hamburger span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}
nav#navbar.menu-open .nav-hamburger span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ─── MOBILE DRAWER ──────────────────────────────────────── */
.nav-mobile-menu {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 999;
  padding-top: 84px;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(37, 99, 235, 0.08);
  box-shadow: 0 12px 40px rgba(37, 99, 235, 0.1);
  transform: translateY(-105%);
  opacity: 0;
  pointer-events: none;
  transition:
    transform 0.32s cubic-bezier(0.4, 0, 0.2, 1),
    opacity 0.28s ease;
  max-height: 90vh;
  overflow-y: auto;
  overscroll-behavior: contain;
}

.nav-mobile-menu.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

.nav-mobile-inner {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 12px 16px 24px;
}

.nav-mobile-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  border-radius: 10px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 500;
  color: var(--gray-700);
  text-decoration: none;
  transition:
    background 0.18s,
    color 0.18s;
  cursor: pointer;
  background: none;
  border: none;
  width: 100%;
  text-align: left;
}

.nav-mobile-link:hover {
  background: var(--gray-100);
  color: var(--blue-500);
}
.nav-mobile-link.active {
  background: var(--blue-50);
  color: var(--blue-600);
  font-weight: 600;
}

.mob-chevron {
  font-size: 10px;
  color: var(--gray-400);
  transition: transform 0.22s ease;
  flex-shrink: 0;
}

.mob-accordion.open .mob-chevron {
  transform: rotate(180deg);
}

.mob-accordion-body {
  display: none;
  flex-direction: column;
  gap: 1px;
  padding: 0 0 4px 12px;
  border-left: 2px solid var(--gray-100);
  margin-left: 16px;
}

.mob-accordion.open .mob-accordion-body {
  display: flex;
}

.mob-section-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border-radius: 8px;
  font-family: var(--font-sub);
  font-size: 13.5px;
  font-weight: 600;
  color: var(--blue-900);
  text-decoration: none;
  transition: background 0.15s;
}

.mob-section-row:hover {
  background: var(--blue-50);
}

.mob-sub-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 7px 14px 7px 22px;
  border-radius: 7px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--gray-500);
  text-decoration: none;
  transition:
    background 0.13s,
    color 0.13s;
}

.mob-sub-row:hover {
  background: var(--blue-50);
  color: var(--blue-600);
}

.mob-num {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  color: var(--blue-400);
  min-width: 32px;
  flex-shrink: 0;
}

.mob-divider {
  height: 1px;
  background: var(--gray-200);
  margin: 8px 0;
}

.nav-mobile-cta {
  display: block;
  width: 100%;
  padding: 13px 16px;
  border-radius: 10px;
  background: var(--blue-500);
  color: var(--white);
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 500;
  text-align: center;
  border: none;
  cursor: pointer;
  transition: background 0.2s;
  text-decoration: none;
  margin-top: 4px;
}

.nav-mobile-cta:hover {
  background: var(--blue-600);
}

/* ─── BACKDROP ───────────────────────────────────────────── */
.nav-backdrop {
  position: fixed;
  inset: 0;
  z-index: 998;
  background: rgba(10, 22, 40, 0.18);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.28s ease;
}

.nav-backdrop.open {
  opacity: 1;
  pointer-events: all;
}

/* ─── PREV / NEXT NAV ────────────────────────────────────── */
.page-nav {
  position: fixed;
  bottom: 32px;
  right: 32px;
  z-index: 900;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 22px;
  border-radius: 50px;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(37, 99, 235, 0.18);
  color: var(--blue-600);
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.12);
  transition: all 0.22s;
}

.page-nav-btn:hover {
  background: var(--blue-500);
  color: var(--white);
  border-color: var(--blue-500);
  transform: translateY(-2px);
  box-shadow: 0 12px 32px rgba(37, 99, 235, 0.28);
}

/* ─── LABEL PILL & HEADER RULE ───────────────────────────── */
.label-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-body);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--blue-500);
  background: var(--blue-50);
  border: 1px solid rgba(37, 99, 235, 0.18);
  padding: 5px 14px;
  border-radius: 50px;
}

.label-pill-spacing {
  margin-bottom: 12px;
}

.header-rule {
  width: 60px;
  height: 3px;
  background: var(--blue-500);
  border-radius: 2px;
  margin: 24px auto 0;
}

/* ─── KEYFRAMES ──────────────────────────────────────────── */
@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(22px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}
@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}
@keyframes pulse-dot {
  0%,
  100% {
    opacity: 1;
    transform: scale(1);
  }
  50% {
    opacity: 0.5;
    transform: scale(1.6);
  }
}

/* ─── BACK TO TOP ────────────────────────────────────────── */
#back-to-top {
  position: fixed;
  bottom: 32px;
  left: 32px;
  z-index: 950;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1.5px solid rgba(37, 99, 235, 0.18);
  color: var(--blue-500);
  box-shadow: 0 6px 24px rgba(37, 99, 235, 0.14);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  transform: translateY(12px) scale(0.88);
  pointer-events: none;
  transition:
    opacity 0.28s ease,
    transform 0.28s ease,
    background 0.2s,
    box-shadow 0.2s;
}

#back-to-top.visible {
  opacity: 1;
  transform: translateY(0) scale(1);
  pointer-events: all;
}
#back-to-top:hover {
  background: var(--blue-500);
  color: var(--white);
  box-shadow: 0 12px 32px rgba(37, 99, 235, 0.32);
}

#back-to-top svg {
  width: 18px;
  height: 18px;
  stroke: currentColor;
  fill: none;
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-linejoin: round;
  transition: transform 0.2s;
}

#back-to-top:hover svg {
  transform: translateY(-2px);
}

/* ─── RESPONSIVE ─────────────────────────────────────────── */
@media (max-width: 1024px) {
  nav#navbar {
    padding: 14px 24px;
  }
}

@media (max-width: 768px) {
  nav#navbar {
    padding: 14px 20px;
    /* Keep single-column grid — hamburger is absolutely positioned */
    grid-template-columns: 1fr;
    position: fixed; /* already set globally, reinforcing context */
  }
  .nav-links {
    display: none;
  }
  .nav-cta {
    display: none;
  }
  .nav-scroll-btn {
    display: none !important; /* hide < > on mobile */
  }
  /* Hamburger always top-right, immune to grid child count */
  .nav-hamburger {
    display: flex;
    position: absolute;
    top: 50%;
    right: 20px;
    transform: translateY(-50%);
    margin: 0;
    grid-column: unset;
  }
  .page-nav {
    bottom: 16px;
    right: 16px;
  }
  .page-nav-btn {
    padding: 9px 16px;
    font-size: 12px;
  }
  #back-to-top {
    bottom: 16px;
    left: 16px;
    width: 40px;
    height: 40px;
  }
}

/* ═══════════════════════════════════════════════════════════
   SECTION CONTENT BLOCKS
   ═══════════════════════════════════════════════════════════ */

/* ─── FIGURE / IMAGE ─────────────────────────────────────── */
.report-figure {
  margin: 24px auto; /* auto left/right centres the block  */
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  overflow: hidden;
  background: var(--gray-50);
}

.report-figure img {
  width: 100%;
  height: auto;
  display: block;
  max-height: 380px;
  object-fit: cover;
}

.report-figure.full-bleed img {
  object-fit: contain;
  background: var(--white); /* prevents grey bars if image has transparency */
}

figcaption {
  display: block; /* block so text-align works naturally */
  text-align: center;
  padding: 10px 16px;
  font-family: var(--font-body);
  font-size: 13px;
  color: var(--gray-500);
  border-top: 1px solid var(--gray-200);
  background: var(--white);
  line-height: 1.5;
}

.fig-label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 700;
  color: var(--blue-600);
  margin-right: 6px;
  flex-shrink: 0;
}

/* ─── TABLE ──────────────────────────────────────────────── */
.report-table-wrap {
  overflow-x: auto;
  margin: 24px 0;
  border-radius: 12px;
  border: 1px solid var(--gray-200);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.04);
}

.report-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-body);
  font-size: 13.5px;
  min-width: 480px;
}

.report-table thead tr {
  background: var(--blue-50);
  border-bottom: 2px solid var(--blue-200);
}

.report-table thead th {
  padding: 13px 18px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 700;
  color: var(--blue-700);
  letter-spacing: 1px;
  text-transform: uppercase;
  white-space: nowrap;
}

/* Second header row (SS-PD / SS-C-PD) needs a bottom border to separate from body */
.report-table thead tr:last-child th {
  border-top: 1px solid rgba(37, 99, 235, 0.15);
  padding-top: 9px;
  padding-bottom: 9px;
}

/* rowspan cells should centre vertically */
.report-table th[rowspan],
.report-table td[rowspan] {
  vertical-align: middle;
  text-align: center;
}

/* colspan header cells centred */
.report-table th[colspan] {
  text-align: center;
  border-bottom: 1px solid rgba(37, 99, 235, 0.15);
}

/* rowspan body cells: vertically centred and slightly muted */
.report-table td[rowspan] {
  vertical-align: middle;
  font-weight: 600;
  color: var(--gray-700);
  background: var(--gray-50);
}

/* superscript in table cells */
.report-table sup {
  font-size: 0.72em;
  line-height: 0;
  vertical-align: super;
}

.report-table tbody tr {
  border-bottom: 1px solid var(--gray-100);
  transition: background 0.15s;
}

.report-table tbody tr:last-child {
  border-bottom: none;
}
.report-table tbody tr:nth-child(even) {
  background: var(--gray-50);
}
.report-table tbody tr:hover {
  background: var(--blue-50);
}

.report-table tbody td {
  padding: 12px 18px;
  color: var(--gray-600);
  vertical-align: middle;
  line-height: 1.55;
}

.td-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 10px;
  border-radius: 50px;
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  white-space: nowrap;
}

.td-badge.green {
  background: #dcfce7;
  color: #166534;
  border: 1px solid #bbf7d0;
}
.td-badge.blue {
  background: var(--blue-50);
  color: var(--blue-700);
  border: 1px solid var(--blue-100);
}
.td-badge.gray {
  background: var(--gray-100);
  color: var(--gray-600);
  border: 1px solid var(--gray-200);
}
.td-badge.orange {
  background: #fff7ed;
  color: #9a3412;
  border: 1px solid #fed7aa;
}

/* ─── FORMULA BLOCK ──────────────────────────────────────── */
.formula-block {
  margin: 24px 0;
  padding: 28px 32px 22px;
  background: linear-gradient(135deg, #f0f6ff 0%, #f8faff 100%);
  border: 1px solid rgba(37, 99, 235, 0.12);
  border-left: 3px solid var(--blue-500);
  border-radius: 0 14px 14px 0;
  text-align: center;
}

.formula-display {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
  font-size: 20px;
  color: var(--blue-900);
  margin-bottom: 12px;
  line-height: 1.4;
}

.f-var,
.f-term {
  font-family: "Georgia", serif;
  font-style: italic;
}
.f-const {
  font-family: var(--font-mono);
  font-size: 22px;
}
.f-eq {
  font-family: var(--font-mono);
  font-size: 20px;
  color: var(--blue-500);
  padding: 0 2px;
}
.f-op {
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--gray-500);
}

.f-frac {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  gap: 3px;
  vertical-align: middle;
  line-height: 1.3;
}

.f-num {
  font-family: "Georgia", serif;
  font-style: italic;
  padding-bottom: 4px;
  border-bottom: 2px solid var(--blue-500);
  min-width: 20px;
  text-align: center;
}

.f-den {
  font-family: "Georgia", serif;
  font-style: italic;
  padding-top: 2px;
  min-width: 20px;
  text-align: center;
}

.formula-eq-label {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--gray-400);
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-top: 4px;
}

/* ─── CHEMICAL EQUATION ──────────────────────────────────── */
.formula-display.chem-eq {
  font-family: "Georgia", "Times New Roman", serif;
  font-size: 20px; /* was 26px */
  font-weight: 400;
  letter-spacing: 0.03em;
  gap: 0;
}

.chem-op {
  margin: 0 8px; /* was 14px */
  color: var(--gray-400); /* lighter than the terms */
  font-style: normal;
}

.chem-arrow {
  margin: 0 10px; /* was 16px */
  font-size: 18px; /* was 22px */
  color: var(--gray-400); /* lighter */
  letter-spacing: 0;
}

.chem-coef {
  margin-right: 3px; /* was 5px */
  font-style: normal;
}

.chem-term {
  display: inline-flex;
  align-items: baseline;
  white-space: nowrap;
}

.formula-display.chem-eq sub {
  font-size: 0.62em;
  vertical-align: sub;
  line-height: 0; /* prevents sub from expanding line height */
}

.formula-eq-label {
  color: var(--gray-400);
}

/* Inline chemical equation — sized to match table body text */
.report-table .formula-display.chem-eq {
  font-size: 14px;
  flex-wrap: wrap;
  row-gap: 2px;
  margin: 0;
}

.report-table .chem-op {
  margin: 0 5px;
}
.report-table .chem-arrow {
  margin: 0 6px;
  font-size: 12px;
}
.report-table .chem-coef {
  margin-right: 2px;
}

/* ─── VIDEO EMBED ────────────────────────────────────────── */
.embed-label {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 600;
  color: var(--blue-500);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 10px;
}

.embed-label::before {
  content: "";
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--blue-400);
  flex-shrink: 0;
}

.video-wrap {
  position: relative;
  padding-top: 56.25%; /* 16 : 9 */
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--gray-200);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.07);
  background: #000;
  margin-bottom: 4px;
}

.video-wrap iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: none;
}

.video-figure {
  max-width: 100%; /* override the centered 560px cap from report-figure */
  margin: 0 0 4px; /* remove auto centering — videos usually span full width */
}

.video-figure .video-wrap {
  border-radius: 12px 12px 0 0; /* flat bottom edge — figcaption sits flush below */
  border-bottom: none;
}

.video-figure figcaption {
  border-radius: 0 0 12px 12px; /* round only the bottom corners */
}

/* ─── MIRO BOARD EMBED ───────────────────────────────────── */
.miro-wrap {
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid var(--gray-200);
  box-shadow: 0 6px 24px rgba(0, 0, 0, 0.07);
  margin-bottom: 4px;
}

.miro-wrap iframe {
  width: 100%;
  height: 480px;
  border: none;
  display: block;
}

/* ─── INTERACTIVE BLOCK ──────────────────────────────── */
.interactive-sampling-block {
  padding: 12px;
}

.interactive-sampling-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  justify-content: center;
  margin-bottom: 8px;
}

.interactive-sampling-controls input {
  width: 88px;
  padding: 4px 6px;
  border: 1px solid #9e9e9e;
  border-radius: 4px;
}

.interactive-sampling-controls button {
  padding: 5px 10px;
  border: 1px solid #1b2d57;
  border-radius: 5px;
  background: #1b2d57;
  color: #fff;
  font-weight: 700;
  cursor: pointer;
}

.interactive-plot {
  width: 100%;
  min-height: 430px;
}

.interactive-metrics {
  margin: 6px 0 0;
  text-align: center;
  font-style: italic;
  font-size: 0.95rem;
}

/* ─── FOOTNOTE SUPERSCRIPTS ──────────────────────────────── */
.fn-ref {
  display: inline;
  line-height: 0;
}

.fn-ref a {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  color: var(--blue-500);
  text-decoration: none;
  vertical-align: super;
  padding: 1px 4px;
  border-radius: 3px;
  background: var(--blue-50);
  border: 1px solid rgba(37, 99, 235, 0.2);
  margin-left: 1px;
  transition: all 0.15s;
}

.fn-ref a:hover {
  background: var(--blue-500);
  color: var(--white);
}

/* ─── FOOTNOTES / REFERENCES SECTION ────────────────────── */
.footnotes-section {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--gray-200);
}

.footnotes-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 700;
  color: var(--gray-400);
  text-transform: uppercase;
  letter-spacing: 1.5px;
  margin-bottom: 16px;
}

.footnotes-heading::after {
  content: "";
  flex: 1;
  height: 1px;
  background: var(--gray-100);
}

.footnotes-list {
  list-style: none;
}

.footnotes-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 8px 0;
  font-family: var(--font-body);
  font-size: 12.5px;
  color: var(--gray-500);
  line-height: 1.65;
  border-bottom: 1px solid var(--gray-100);
}

.footnotes-list li:last-child {
  border-bottom: none;
}

.fn-num {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 700;
  color: var(--blue-500);
  background: var(--blue-50);
  border: 1px solid rgba(37, 99, 235, 0.15);
  padding: 1px 7px;
  border-radius: 50px;
  flex-shrink: 0;
  margin-top: 2px;
  white-space: nowrap;
}

.fn-back {
  margin-left: 6px;
  color: var(--blue-400);
  text-decoration: none;
  font-size: 11px;
  transition: color 0.15s;
}

.fn-back:hover {
  color: var(--blue-600);
}

/* ═══════════════════════════════════════════════════════════
   THIRD-LEVEL HIERARCHY  (sub-sub)
   ═══════════════════════════════════════════════════════════ */

/* ─── NAVBAR DROPDOWN — third level ─────────────────────── */
.dd-subsub-wrap {
  margin: 2px 0 4px 20px;
  padding: 0 0 2px 12px;
  border-left: 1px dashed var(--gray-200);
}

.dd-subsub {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 10px;
  border-radius: 6px;
  text-decoration: none;
  font-family: var(--font-body);
  font-size: 11.5px;
  color: var(--gray-400);
  transition:
    background 0.13s,
    color 0.13s;
}

.dd-subsub:hover {
  background: var(--blue-50);
  color: var(--blue-500);
}

.dd-subsub-num {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 500;
  color: var(--gray-300);
  min-width: 36px;
  flex-shrink: 0;
  transition: color 0.13s;
}

.dd-subsub:hover .dd-subsub-num {
  color: var(--blue-300);
}

/* ─── MOBILE DRAWER — third level ───────────────────────── */
.mob-subsub-row {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 6px 14px 6px 40px;
  border-radius: 6px;
  font-family: var(--font-body);
  font-size: 12.5px;
  color: var(--gray-400);
  text-decoration: none;
  transition:
    background 0.13s,
    color 0.13s;
}

.mob-subsub-row:hover {
  background: var(--blue-50);
  color: var(--blue-500);
}

/* ─── TOC — third-level row ──────────────────────────────── */
.toc-subsub-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 7px 28px 7px 64px;
  text-decoration: none;
  color: var(--gray-400);
  font-family: var(--font-body);
  font-size: 13px;
  transition:
    background 0.13s,
    color 0.13s;
  position: relative;
}

.toc-subsub-item::before {
  content: "";
  position: absolute;
  left: 50px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--gray-200);
  transition: background 0.13s;
}

.toc-subsub-item:hover {
  background: var(--blue-50);
  color: var(--blue-500);
}

.toc-subsub-item:hover::before {
  background: var(--blue-300);
}

.subsub-num {
  font-family: var(--font-mono);
  font-size: 10.5px;
  font-weight: 500;
  color: var(--gray-300);
  min-width: 40px;
  flex-shrink: 0;
  transition: color 0.13s;
}

.toc-subsub-item:hover .subsub-num {
  color: var(--blue-300);
}

/* ─── SECTION PAGE — sub-subsection card ────────────────── */
/*
 * Sits inside .section-body, visually nested under the parent
 * .report-section. Uses muted gray tones (not blue) so the
 * three levels are immediately distinguishable at a glance:
 *   Level 1  report-section   white card + blue header
 *   Level 2  section-body     plain padded area
 *   Level 3  subsub-section   gray-tinted card inside level 2
 */
.subsub-section {
  margin: 20px 0;
  border: 1px solid var(--gray-200);
  border-radius: 12px;
  overflow: hidden;
  background: var(--white);
}

.subsub-section:first-child {
  margin-top: 8px;
}

.subsub-heading {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 20px;
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-100);
}

.subsub-tag {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.8px;
  text-transform: uppercase;
  color: var(--gray-500);
  background: var(--gray-100);
  border: 1px solid var(--gray-200);
  padding: 3px 9px;
  border-radius: 50px;
  flex-shrink: 0;
}

.subsub-heading h3 {
  font-family: var(--font-sub);
  font-size: 14.5px;
  font-weight: 600;
  color: var(--blue-900);
}

.subsub-body {
  padding: 18px 20px 20px;
}

.subsub-body p {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.82;
  color: var(--gray-600);
  margin-bottom: 14px;
}

.subsub-body p:last-child {
  margin-bottom: 0;
}

/* Pass-through styles so content blocks render inside subsub-body */
.subsub-body .report-table-wrap,
.subsub-body .formula-block,
.subsub-body .video-wrap,
.subsub-body .miro-wrap,
.subsub-body .obj-list {
  margin-top: 0;
}

/* ─── NAV SCROLL BUTTONS < > ─────────────────────────────── */
.nav-links {
  overflow-x: hidden;
  overflow-y: clip;
  scroll-behavior: smooth;
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.nav-links.is-overflowing {
  justify-content: flex-start;
}

.nav-links.fade-left {
  -webkit-mask-image: linear-gradient(to right, transparent 0, black 28px);
  mask-image: linear-gradient(to right, transparent 0, black 28px);
}
.nav-links.fade-right {
  -webkit-mask-image: linear-gradient(to left, transparent 0, black 28px);
  mask-image: linear-gradient(to left, transparent 0, black 28px);
}
.nav-links.fade-left.fade-right {
  -webkit-mask-image: linear-gradient(
    to right,
    transparent 0,
    black 28px,
    black calc(100% - 28px),
    transparent 100%
  );
  mask-image: linear-gradient(
    to right,
    transparent 0,
    black 28px,
    black calc(100% - 28px),
    transparent 100%
  );
}

.nav-scroll-btn {
  display: none;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  border: 1.5px solid rgba(37, 99, 235, 0.18);
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  color: var(--blue-500);
  font-size: 16px;
  line-height: 1;
  padding: 0 0 1px 0;
  cursor: pointer;
  flex-shrink: 0;
  transition:
    background 0.18s,
    box-shadow 0.18s;
  box-shadow: 0 2px 8px rgba(37, 99, 235, 0.1);
}

.nav-scroll-btn.visible {
  display: flex;
}
.nav-scroll-btn:first-of-type {
  margin-left: 10px;
}
.nav-scroll-btn:last-of-type {
  margin-right: 10px;
}

.nav-scroll-btn:hover {
  background: var(--blue-500);
  color: var(--white);
  box-shadow: 0 4px 14px rgba(37, 99, 235, 0.28);
}

.nav-scroll-btn.hidden {
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
}

/* ─── DROPDOWN — body-appended, positioned by JS ─────────── */
.nav-dropdown {
  position: fixed;
  width: max-content;
  min-width: 200px;
  max-width: 260px;
  background: rgba(255, 255, 255, 0.99);
  backdrop-filter: blur(24px);
  -webkit-backdrop-filter: blur(24px);
  border: 1px solid rgba(37, 99, 235, 0.1);
  border-radius: 18px;
  box-shadow:
    0 20px 60px rgba(37, 99, 235, 0.13),
    0 4px 16px rgba(0, 0, 0, 0.05);
  padding: 8px;
  z-index: 9999;
  max-height: 72vh;
  overflow-y: auto;
  overscroll-behavior: contain;
  visibility: hidden;
  opacity: 0;
  pointer-events: none;
  transform: translateY(-6px);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0s linear 0.2s;
}

.nav-dropdown.open {
  visibility: visible;
  opacity: 1;
  pointer-events: all;
  transform: translateY(0);
  transition:
    opacity 0.2s ease,
    transform 0.2s ease,
    visibility 0s;
}