/* ============================================================
   NEXTBESTIE — Brand-specific styles
   Shared case study structure lives in css/casestudy.css
   Accent: #FF4B81 (brand pink)
============================================================ */

/* ---- Colour tokens ----------------------------------------- */
:root {
  --nb-blue:       #FF4B81;
  --nb-blue-dark:  #E0366A;
  --nb-indigo:     #FF7AA4;
  --nb-glow:       rgba(255,75,129,0.2);
}

/* ---- Hero blobs -------------------------------------------- */
.nb-blob--1 {
  position: absolute;
  width: 600px; height: 600px;
  background: radial-gradient(circle, #6D28D9, transparent);
  top: -200px; left: -150px;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  opacity: 0.5;
}
.nb-blob--2 {
  position: absolute;
  width: 500px; height: 500px;
  background: radial-gradient(circle, #4F46E5, transparent);
  bottom: -100px; right: -100px;
  border-radius: 50%;
  filter: blur(120px);
  pointer-events: none;
  opacity: 0.5;
}

/* ---- Hero brand styles ------------------------------------ */
.nb-hero { padding: 120px 32px 80px; }

.nb-section-tag {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--nb-blue);
  background: rgba(255,75,129,0.1);
  border: 1px solid rgba(255,75,129,0.25);
  padding: 6px 14px;
  border-radius: 100px;
  margin-bottom: 20px;
}

.nb-title {
  font-family: var(--font-display);
  font-size: clamp(42px, 5.5vw, 72px);
  font-weight: 800;
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--text);
  margin-bottom: 12px;
}
.nb-tagline {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 26px);
  font-style: italic;
  font-weight: 400;
  color: var(--nb-blue);
  margin-bottom: 20px;
}

/* ---- Brand accent overrides ------------------------------- */
.nb-persona-section .persona { --persona-accent: var(--nb-blue); }
.nb-persona-section .persona__avatar { border-color: var(--nb-blue); box-shadow: 0 0 0 6px rgba(255,75,129,0.12); }
.nb-persona-section .persona__badge { color: var(--nb-blue); background: rgba(255,75,129,0.1); border-color: rgba(255,75,129,0.25); }

.nb-label           { color: var(--nb-blue) !important; }
.cs-section__title em { color: var(--nb-blue); }

/* Meta label default (nb uses text-dim, overridden per-label via nb-label) */
.cs-meta__label { color: var(--text-dim); }

/* ---- Quote ------------------------------------------------ */
.nb-quote {
  font-family: var(--font-display);
  font-size: clamp(22px, 2.2vw, 30px);
  font-style: italic;
  font-weight: 700;
  color: var(--text);
  line-height: 1.45;
  padding-left: 24px;
  border-left: 3px solid var(--nb-blue);
  margin: 0;
  align-self: center;
}

/* ---- Loop number & arrow ---------------------------------- */
.nb-num {
  font-family: var(--font-display);
  font-size: 52px;
  font-weight: 900;
  color: var(--nb-blue);
  opacity: 0.7;
  line-height: 1;
  margin-bottom: 12px;
}
.nb-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  color: var(--nb-blue);
  opacity: 0.4;
  flex-shrink: 0;
}

/* ---- Brand hover overrides for shared cs-* cards ---------- */
.cs-pain-card:hover         { border-color: rgba(255,75,129,0.35); }
.cs-loop__step:hover        { border-color: rgba(255,75,129,0.35); }
.cs-feature-card:hover      { border-color: rgba(255,75,129,0.3); }
.cs-audience-card:hover     { border-color: rgba(255,75,129,0.3); }
.cs-nav-footer__link:hover  { border-color: rgba(255,75,129,0.35); }

/* ---- Feature card brand styles ---------------------------- */
.cs-feature-card::after {
  background: linear-gradient(to right, transparent, rgba(255,75,129,0.5), transparent);
}
.nb-card-num {
  position: absolute;
  top: 28px; right: 28px;
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 900;
  color: var(--nb-blue);
  opacity: 0.6;
  line-height: 1;
}
.nb-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--nb-blue);
  background: rgba(255,75,129,0.08);
  border: 1px solid rgba(255,75,129,0.2);
  padding: 4px 12px;
  border-radius: 100px;
}

/* ---- Idea section ----------------------------------------- */
.nb-idea {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ---- Audience section wrapper ----------------------------- */
.nb-audience-section {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

/* ---- Mockup wrap ------------------------------------------ */
.nb-mockup-wrap {
  position: relative;
  width: 100%;
  max-width: 680px;
  margin-left: 0;
}
.nb-mockup-wrap .cs-hero__mockup-img {
  width: 100%;
  margin-left: 0;
}

/* ---- Floating feature tags -------------------------------- */
.nb-float-tag {
  position: absolute;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 8px 14px;
  border-radius: 100px;
  font-size: 12px;
  font-weight: 700;
  background: rgba(14,14,18,0.88);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid rgba(255,75,129,0.3);
  color: var(--text);
  white-space: nowrap;
  box-shadow: 0 8px 24px rgba(0,0,0,0.45);
}
.nb-float-tag--1 {
  top: 15%; left: 32%;
  animation: nbTagFloat 4s ease-in-out infinite;
}
.nb-float-tag--2 {
  top: 46%; left: 5%;
  animation: nbTagFloatCenter 4.4s ease-in-out infinite;
  animation-delay: -1.5s;
}
.nb-float-tag--3 {
  bottom: 15%; right: 42%;
  animation: nbTagFloat 3.8s ease-in-out infinite;
  animation-delay: -2.8s;
}

@keyframes nbTagFloat {
  0%, 100% { transform: translateY(0); }
  50%       { transform: translateY(-8px); }
}
@keyframes nbTagFloatCenter {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(-8px); }
}

/* ---- Origin story ------------------------------------------ */
.nb-origin {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  padding: 80px 0;
}
.nb-origin__inner {
  max-width: 760px;
  margin: 0 auto;
  text-align: center;
  position: relative;
}
.nb-origin__quote-mark {
  font-family: var(--font-display);
  font-size: 120px;
  line-height: 0.7;
  color: var(--nb-blue);
  opacity: 0.15;
  margin-bottom: 24px;
}
.nb-origin__text {
  font-size: 18px;
  color: var(--text-muted);
  line-height: 1.85;
  margin-bottom: 36px;
}
.nb-origin__author {
  display: inline-flex;
  align-items: center;
  gap: 14px;
}
.nb-origin__author-img {
  width: 48px; height: 48px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid rgba(255,75,129,0.3);
  flex-shrink: 0;
}
.nb-origin__author-img img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.nb-origin__author-name {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.nb-origin__author-role {
  display: block;
  font-size: 13px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ---- Download CTA brand overrides ------------------------- */
.nb-download { padding: 80px 0 0; }
.cs-download__inner { border-color: rgba(255,75,129,0.15); }
.cs-download__inner::before {
  background: linear-gradient(to right, transparent, var(--nb-blue), transparent);
}
.nb-download__blob {
  position: absolute;
  width: 600px; height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(255,75,129,0.15), transparent);
  top: -250px; left: 50%;
  transform: translateX(-50%);
  filter: blur(80px);
  pointer-events: none;
}
.nb-download__title {
  font-family: var(--font-display);
  font-size: clamp(44px, 5vw, 72px);
  font-weight: 900;
  letter-spacing: -0.03em;
  color: var(--text);
  line-height: 1.1;
  margin: 16px 0 16px;
}
.nb-download__title em {
  font-style: italic;
  color: var(--nb-blue);
}

/* ---- User Research ----------------------------------------- */
.nb-research__layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: start;
}
.nb-subsection-title {
  font-size: 12px;
  font-weight: 700;
  color: var(--nb-blue);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 24px;
}
.nb-insight-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px solid var(--border);
}
.nb-insight-item:last-child { border-bottom: none; }
.nb-insight-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--nb-blue);
  margin-top: 7px;
  flex-shrink: 0;
}
.nb-insight-item p {
  font-size: 16px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- Survey Card ------------------------------------------ */
.nb-survey-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 36px 40px;
}
.nb-survey-card__header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 32px;
}
.nb-survey-card__title {
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 800;
  color: var(--text);
}
.nb-survey-card__meta {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-dim);
}
.nb-survey-stats {
  display: flex;
  flex-direction: column;
  gap: 24px;
}
.nb-survey-stat__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 8px;
}
.nb-survey-stat__label {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.5;
}
.nb-survey-stat__pct {
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 800;
  color: var(--nb-blue);
  flex-shrink: 0;
}
.nb-survey-stat__track {
  height: 5px;
  background: rgba(255,75,129,0.1);
  border-radius: 100px;
  overflow: hidden;
}
.nb-survey-stat__fill {
  height: 100%;
  background: linear-gradient(90deg, var(--nb-blue), rgba(255,75,129,0.5));
  border-radius: 100px;
}
.nb-survey-card__footnote {
  font-size: 11px;
  color: var(--text-dim);
  margin-top: 28px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  opacity: 0.6;
}

/* ---- Placeholders ----------------------------------------- */
.nb-placeholder {
  border: 1.5px dashed rgba(255,75,129,0.25);
  border-radius: var(--radius-xl);
  background: rgba(255,75,129,0.03);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  min-height: 220px;
}
.nb-placeholder--research  { min-height: 280px; }
.nb-placeholder--journey   { min-height: 160px; margin-top: 40px; }
.nb-journey-map {
  margin-top: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.nb-journey-map__img { display: block; width: 100%; height: auto; }
.nb-placeholder--wireframes { min-height: 320px; }
.nb-wireframes {
  margin-top: 40px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.nb-wireframes__img { display: block; width: 100%; height: auto; }
.nb-placeholder--iterations { min-height: 200px; margin-top: 40px; }
.nb-before-after {
  max-width: 900px;
  margin: 40px auto 0;
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.nb-before-after__img {
  display: block;
  width: 100%;
  height: auto;
  max-height: 70vh;
  object-fit: contain;
}
.nb-placeholder--feedback { min-height: 160px; margin-top: 40px; }
.nb-placeholder--persona  { min-height: 160px; }
.nb-placeholder__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--text-dim);
  opacity: 0.55;
}

/* ---- Persona ---------------------------------------------- */
.nb-persona-section {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.nb-persona-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 48px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 48px;
  align-items: start;
  max-width: 1100px;
  margin: 0 auto;
}
.nb-persona-card__avatar {
  width: 80px; height: 80px;
  border-radius: 50%;
  background: rgba(255,75,129,0.12);
  border: 2px solid rgba(255,75,129,0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 800;
  color: var(--nb-blue);
  flex-shrink: 0;
  overflow: hidden;
}
.nb-persona-card__avatar img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
}
.nb-persona-card__header {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 24px;
}
.nb-persona-name {
  font-family: var(--font-display);
  font-size: 28px;
  font-weight: 800;
  color: var(--text);
  margin: 0;
}
.nb-persona-age {
  font-size: 12px;
  font-weight: 600;
  color: var(--nb-blue);
  background: rgba(255,75,129,0.08);
  border: 1px solid rgba(255,75,129,0.2);
  padding: 4px 12px;
  border-radius: 100px;
}
.nb-persona-details {
  display: flex;
  gap: 32px;
  align-items: flex-start;
}
.nb-persona-detail__label {
  display: block;
  font-size: 10px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--nb-blue);
  margin-bottom: 6px;
}
.nb-persona-detail__text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.6;
  margin: 0;
}
.nb-persona-divider {
  width: 1px;
  height: 60px;
  background: var(--border);
  flex-shrink: 0;
  margin-top: 22px;
}

/* ---- User Journey ----------------------------------------- */
.nb-journey {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr auto 1fr auto 1fr auto 1fr;
  align-items: stretch;
  overflow-x: auto;
  padding: 10px 2px 8px;
}
.nb-journey__step {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 28px 20px;
  text-align: center;
  min-width: 110px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: border-color 0.3s, transform 0.3s var(--ease-out);
}
.nb-journey__step:hover {
  border-color: rgba(255,75,129,0.35);
  transform: translateY(-4px);
}
.nb-journey__num {
  font-family: var(--font-display);
  font-size: 32px;
  font-weight: 900;
  color: var(--nb-blue);
  opacity: 0.6;
  line-height: 1;
  margin-bottom: 8px;
}
.nb-journey__step h4 {
  font-size: 13px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 6px;
}
.nb-journey__step p {
  font-size: 12px;
  color: var(--text-muted);
  line-height: 1.5;
}
.nb-journey__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 10px;
  color: var(--nb-blue);
  opacity: 0.4;
  flex-shrink: 0;
}

/* ---- App Structure / Sitemap ------------------------------ */
.nb-appstructure-section {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.nb-sitemap { max-width: 800px; margin: 0 auto; text-align: center; }
.nb-sitemap__root { display: flex; justify-content: center; margin-bottom: 32px; }
.nb-sitemap__node {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 20px;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  transition: border-color 0.3s;
}
.nb-sitemap__node:hover { border-color: rgba(255,75,129,0.35); }
.nb-sitemap__node--root {
  background: rgba(255,75,129,0.08);
  border-color: rgba(255,75,129,0.3);
  color: var(--nb-blue);
  font-weight: 700;
  font-size: 15px;
}
.nb-sitemap__branches {
  display: flex;
  justify-content: center;
  gap: 12px;
  flex-wrap: wrap;
}

/* ---- Design Decisions ------------------------------------- */
.nb-decisions-section {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.nb-decisions__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  max-width: 900px;
  margin: 0 auto;
}
.nb-decision-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 28px 32px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  gap: 20px;
  align-items: center;
  transition: border-color 0.3s, transform 0.3s var(--ease-out);
}
.nb-decision-card:hover {
  border-color: rgba(255,75,129,0.35);
  transform: translateY(-4px);
}
.nb-decision-card__choice {
  font-size: 15px;
  font-weight: 700;
  color: var(--text);
}
.nb-decision-card__arrow {
  font-size: 20px;
  color: var(--nb-blue);
  opacity: 0.6;
  font-weight: 300;
}
.nb-decision-card__reason {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ---- Design Iterations ------------------------------------ */
.nb-iterations {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  align-items: stretch;
  max-width: 900px;
  margin: 0 auto 40px;
}
.nb-iteration {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  transition: border-color 0.3s, transform 0.3s var(--ease-out);
}
.nb-iteration:hover {
  border-color: rgba(255,75,129,0.35);
  transform: translateY(-4px);
}
.nb-iteration--final {
  border-color: rgba(255,75,129,0.25);
  background: rgba(255,75,129,0.04);
}
.nb-iteration__ver {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 900;
  color: var(--nb-blue);
  opacity: 0.7;
  line-height: 1;
  margin-bottom: 12px;
}
.nb-iteration h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.nb-iteration p {
  font-size: 13px;
  color: var(--text-muted);
  line-height: 1.6;
}
.nb-iteration__arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 20px;
  color: var(--nb-blue);
  opacity: 0.4;
  flex-shrink: 0;
}

/* ---- Testing & Feedback ----------------------------------- */
.nb-testing-section {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.nb-feedback__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}
.nb-feedback-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  transition: border-color 0.3s, transform 0.3s var(--ease-out);
}
.nb-feedback-card:hover {
  border-color: rgba(255,75,129,0.35);
  transform: translateY(-4px);
}
.nb-feedback-card__num {
  font-family: var(--font-display);
  font-size: 40px;
  font-weight: 900;
  color: var(--nb-blue);
  opacity: 0.5;
  line-height: 1;
  margin-bottom: 16px;
}
.nb-feedback-card p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.75;
}
.nb-feedback-card strong { color: var(--text); font-weight: 700; }

/* ---- User Quote Cards ------------------------------------- */
.nb-quotes {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 40px;
}
.nb-quote-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 32px 28px;
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: border-color 0.3s, transform 0.3s var(--ease-out);
}
.nb-quote-card:hover {
  border-color: rgba(255,75,129,0.35);
  transform: translateY(-4px);
}
.nb-quote-card__mark {
  font-family: var(--font-display);
  font-size: 52px;
  line-height: 0.9;
  color: var(--nb-blue);
  opacity: 0.35;
}
.nb-quote-card__text {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.78;
  flex: 1;
}
.nb-quote-card__author {
  display: flex;
  align-items: center;
  gap: 12px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  margin-top: auto;
}
.nb-quote-card__avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 800;
  color: var(--nb-blue);
  flex-shrink: 0;
}
.nb-quote-card__name {
  display: block;
  font-size: 14px;
  font-weight: 700;
  color: var(--text);
}
.nb-quote-card__meta {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 2px;
}

/* ---- Outcome ---------------------------------------------- */
.nb-outcome__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  max-width: 1000px;
  margin: 0 auto;
}
.nb-outcome-item {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  padding: 36px 28px;
  transition: border-color 0.3s, transform 0.3s var(--ease-out);
}
.nb-outcome-item:hover {
  border-color: rgba(255,75,129,0.35);
  transform: translateY(-4px);
}
.nb-outcome-item__icon {
  width: 48px; height: 48px;
  background: rgba(255,75,129,0.1);
  border: 1px solid rgba(255,75,129,0.2);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--nb-blue);
  margin-bottom: 20px;
}
.nb-outcome-item h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 10px;
}
.nb-outcome-item p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.7;
}

/* ---- What I Learned --------------------------------------- */
.nb-learnings-section {
  background: var(--bg-2);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.nb-learnings {
  max-width: 760px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
}
.nb-learning-item {
  display: flex;
  gap: 32px;
  align-items: flex-start;
  padding: 32px 0;
  border-bottom: 1px solid var(--border);
}
.nb-learning-item:last-child { border-bottom: none; }
.nb-learning-num {
  font-family: var(--font-display);
  font-size: 48px;
  font-weight: 900;
  color: var(--nb-blue);
  opacity: 0.5;
  line-height: 1;
  flex-shrink: 0;
  width: 60px;
}
.nb-learning-item h4 {
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 8px;
}
.nb-learning-item p {
  font-size: 15px;
  color: var(--text-muted);
  line-height: 1.75;
  margin: 0;
}

/* ---- Responsive ------------------------------------------- */
@media (max-width: 1024px) {
  .nb-arrow { transform: rotate(90deg); justify-self: center; padding: 8px 0; }
  .nb-research__layout { grid-template-columns: 1fr; }
  .nb-persona-card { grid-template-columns: auto 1fr; }
  .nb-journey { grid-template-columns: 1fr; }
  .nb-journey__arrow { transform: rotate(90deg); justify-self: center; padding: 8px 0; }
  .nb-decisions__grid { grid-template-columns: 1fr; }
  .nb-decision-card { grid-template-columns: 1fr; gap: 8px; }
  .nb-decision-card__arrow { display: none; }
  .nb-iterations { grid-template-columns: 1fr; }
  .nb-iteration__arrow { transform: rotate(90deg); justify-self: center; padding: 8px 0; }
  .nb-feedback__grid { grid-template-columns: 1fr; }
  .nb-outcome__grid { grid-template-columns: 1fr; }
  .nb-quotes { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .nb-hero { padding: 100px 20px 60px; }
  .nb-origin__inner { padding: 0 20px; }
  .nb-persona-card { grid-template-columns: 1fr; gap: 24px; padding: 32px 24px; }
  .nb-persona-card__avatar { margin: 0 auto; }
  .nb-persona-card__header { flex-direction: column; gap: 8px; text-align: center; }
  .nb-persona-details { flex-direction: column; gap: 16px; }
  .nb-persona-divider { display: none; }
  .nb-learning-num { font-size: 36px; width: 48px; }
  .nb-learning-item { gap: 20px; }
}

@media (max-height: 860px) and (min-width: 1025px) {
  .nb-hero { padding: 90px 32px 60px; }
  .nb-title { font-size: clamp(36px, 4vw, 56px); }
}