/* Ontological SEO practice landing — extends NRLC editorial system */

.page-ontological-seo {
  --oseo-ink: var(--nrlc-ink);
  --oseo-sky: var(--nrlc-sky-strong);
  --oseo-line: rgba(7, 141, 219, 0.55);
  --oseo-node: #078DDB;
  --oseo-node-soft: rgba(18, 159, 233, 0.55);
  --oseo-mist: rgba(232, 244, 255, 0.55);
}

/* ── Full-bleed hero composition ─────────────────────────── */

.oseo-hero {
  position: relative;
  min-height: min(92vh, 52rem);
  display: flex;
  align-items: flex-end;
  overflow: hidden;
  isolation: isolate;
  background:
    radial-gradient(ellipse 70% 55% at 72% 38%, rgba(18, 159, 233, 0.22), transparent 58%),
    radial-gradient(ellipse 50% 45% at 18% 70%, rgba(7, 141, 219, 0.12), transparent 55%),
    linear-gradient(165deg, #E4F2FF 0%, #F0F7FF 38%, #F7FBFF 100%);
  padding: clamp(5.5rem, 12vh, 7.5rem) 0 clamp(3rem, 6vh, 4.5rem);
}

.oseo-hero__plane {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.oseo-hero__svg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 1;
}

.oseo-hero__content {
  position: relative;
  z-index: 1;
  width: var(--nrlc-container);
  margin-inline: auto;
  max-width: 38rem;
  opacity: 0;
  transform: translateY(1.25rem);
  animation: oseo-rise 900ms cubic-bezier(0.22, 1, 0.36, 1) 120ms forwards;
}

.oseo-hero__brand {
  margin: 0 0 1rem;
  font-family: var(--nrlc-font-display);
  font-size: clamp(3.25rem, 8vw, 5.75rem);
  font-weight: 600;
  line-height: 0.92;
  letter-spacing: -0.045em;
  color: var(--oseo-ink);
}

.oseo-hero__lede {
  margin: 0 0 1.75rem;
  max-width: 34rem;
  font-size: clamp(1.08rem, 2vw, 1.28rem);
  line-height: 1.55;
  color: var(--nrlc-muted);
}

.oseo-hero .nrlc-cta-row {
  margin-top: 0;
}

/* Graph drawing motion */
.oseo-edge {
  fill: none;
  stroke: var(--oseo-line);
  stroke-width: 2.2;
  stroke-linecap: round;
  stroke-dasharray: 420;
  stroke-dashoffset: 420;
  animation: oseo-draw 1.8s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

.oseo-edge--delay-1 { animation-delay: 0.25s; }
.oseo-edge--delay-2 { animation-delay: 0.45s; }
.oseo-edge--delay-3 { animation-delay: 0.65s; }
.oseo-edge--delay-4 { animation-delay: 0.85s; }

.oseo-node {
  fill: var(--oseo-node);
  opacity: 0;
  transform-origin: center;
  animation: oseo-node-in 700ms cubic-bezier(0.22, 1, 0.36, 1) forwards;
}

.oseo-node--pulse {
  animation:
    oseo-node-in 700ms cubic-bezier(0.22, 1, 0.36, 1) forwards,
    oseo-pulse 3.2s ease-in-out 1.2s infinite;
}

.oseo-node-ring {
  fill: none;
  stroke: var(--oseo-node-soft);
  stroke-width: 1.25;
  opacity: 0;
  animation: oseo-ring 3.2s ease-out 1.1s infinite;
}

.oseo-node--d1 { animation-delay: 0.55s; }
.oseo-node--d2 { animation-delay: 0.7s; }
.oseo-node--d3 { animation-delay: 0.85s; }
.oseo-node--d4 { animation-delay: 1s; }
.oseo-node--d5 { animation-delay: 1.15s; }

.oseo-label {
  fill: var(--nrlc-muted);
  font-family: var(--nrlc-font-body);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  opacity: 0;
  animation: oseo-fade 800ms ease 1.3s forwards;
}

@keyframes oseo-rise {
  to { opacity: 1; transform: translateY(0); }
}

@keyframes oseo-draw {
  to { stroke-dashoffset: 0; }
}

@keyframes oseo-node-in {
  from { opacity: 0; transform: scale(0.4); }
  to { opacity: 1; transform: scale(1); }
}

@keyframes oseo-pulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.12); }
}

@keyframes oseo-ring {
  0% { opacity: 0.55; transform: scale(0.85); }
  70% { opacity: 0; transform: scale(1.55); }
  100% { opacity: 0; transform: scale(1.55); }
}

@keyframes oseo-fade {
  to { opacity: 0.85; }
}

/* ── Body sections ───────────────────────────────────────── */

.oseo-page {
  position: relative;
}

.oseo-section {
  padding: var(--nrlc-section-md) 0;
}

.oseo-section--reveal {
  opacity: 0;
  transform: translateY(1rem);
  transition: opacity 700ms cubic-bezier(0.22, 1, 0.36, 1), transform 700ms cubic-bezier(0.22, 1, 0.36, 1);
}

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

.oseo-definition {
  max-width: 42rem;
  margin: 0;
  padding: 0;
  border: none;
  background: transparent;
}

.oseo-definition dfn {
  font-family: var(--nrlc-font-display);
  font-style: normal;
  font-weight: 600;
  font-size: 1.15em;
  color: var(--oseo-ink);
}

.oseo-definition p {
  margin: 0;
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  line-height: 1.55;
  color: var(--oseo-ink);
}

.oseo-stack {
  display: grid;
  gap: clamp(1.75rem, 3vw, 2.5rem);
  max-width: 46rem;
}

.oseo-compare {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--nrlc-line);
}

.oseo-compare__row {
  display: grid;
  grid-template-columns: minmax(7rem, 11rem) 1fr;
  gap: 1rem 1.5rem;
  padding: 1.15rem 0;
  border-bottom: 1px solid var(--nrlc-line);
  align-items: start;
}

.oseo-compare__row dt {
  margin: 0;
  font-family: var(--nrlc-font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--oseo-ink);
  line-height: 1.2;
}

.oseo-compare__row dd {
  margin: 0;
  color: var(--nrlc-muted);
  font-size: 1rem;
  line-height: 1.55;
}

.oseo-compare__row--focus dt {
  color: var(--oseo-sky);
}

.oseo-practice-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
  max-width: 42rem;
  counter-reset: oseo-step;
}

.oseo-practice-list li {
  display: grid;
  grid-template-columns: 2.5rem 1fr;
  gap: 1rem;
  align-items: start;
  counter-increment: oseo-step;
}

.oseo-practice-list li::before {
  content: counter(oseo-step, decimal-leading-zero);
  font-family: var(--nrlc-font-display);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--oseo-sky);
  line-height: 1.2;
}

.oseo-practice-list strong {
  display: block;
  font-family: var(--nrlc-font-display);
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--oseo-ink);
  margin-bottom: 0.35rem;
}

.oseo-practice-list p {
  margin: 0;
  color: var(--nrlc-muted);
  line-height: 1.55;
}

@media (max-width: 768px) {
  .oseo-hero {
    min-height: min(88vh, 40rem);
    align-items: flex-end;
    padding-bottom: 2.5rem;
  }

  .oseo-hero__svg {
    opacity: 0.72;
    transform: scale(1.2) translate(12%, -6%);
  }

  .oseo-label {
    display: none;
  }

  .oseo-compare__row {
    grid-template-columns: 1fr;
    gap: 0.35rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .oseo-hero__content,
  .oseo-edge,
  .oseo-node,
  .oseo-node--pulse,
  .oseo-node-ring,
  .oseo-label,
  .oseo-section--reveal {
    animation: none !important;
    transition: none !important;
    opacity: 1 !important;
    transform: none !important;
    stroke-dashoffset: 0 !important;
  }
}