/* ===== Reset / base ===== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html, body {
  margin: 0;
  padding: 0;
}

body {
  font-family: "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #111111;
  line-height: 1.6;
  background-color: #ffffff;
}

/* Theme variables */
:root {
  --nn-bg: #ffffff;
  --nn-bg-alt: #f5f5f7;
  --nn-text-main: #111111;
  --nn-text-muted: #555555;
  --nn-border-subtle: #e5e5ea;

  /* Accents: blue + orange */
  --nn-accent-blue: #007bff;
  --nn-accent-orange: #ff7a1a;

  --nn-radius-lg: 18px;
  --nn-radius-md: 12px;
  --nn-radius-pill: 999px;
  --nn-shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.06);
  --nn-max-width: 1080px;
}

/* Layout helpers */

.nn-container {
  max-width: var(--nn-max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

/* sections start hidden and slightly down */
.nn-section {
  padding: 5rem 0;
  position: relative;
  z-index: 10; /* higher than background animation */
  background-color: #ffffff;

  /* Temporarily visible by default so content always shows */
  opacity: 1;
  transform: translateY(0);
  transition:
    opacity 0.5s ease-out,
    transform 0.5s ease-out;
}

.nn-section-alt {
  background-color: #f8f8fb;
}

.nn-section-header {
  max-width: 640px;
  margin: 0 auto 3rem auto;
  text-align: center;
}

.nn-section-header h2 {
  font-size: 2.25rem;
  margin-bottom: 0.75rem;
}

.nn-section-header p {
  margin: 0;
  color: var(--nn-text-muted);
}

/* ===== Header / nav ===== */

.nn-header {
  position: sticky;
  top: 0;
  z-index: 5;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(16px);
  border-bottom: 1px solid rgba(229, 229, 234, 0.9);
}

.nn-header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding: 0.8rem 0;
}

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

.nn-logo {
  height: 40px;
  width: auto;
}

.nn-logo-mark {
  width: 34px;
  height: 34px;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 30% 0%, var(--nn-accent-orange), var(--nn-accent-blue));
  color: #ffffff;
  font-size: 1.1rem;
}

.nn-logo-text {
  display: flex;
  flex-direction: column;
}

.nn-logo-title {
  font-weight: 600;
  font-size: 1.05rem;
}

.nn-logo-tagline {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--nn-text-muted);
}

.nn-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem;
  font-size: 0.9rem;
}

.nn-nav a {
  text-decoration: none;
  color: var(--nn-text-muted);
  position: relative;
  padding-bottom: 0.2rem;
}

.nn-nav a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--nn-accent-blue), var(--nn-accent-orange));
  transition: width 0.18s ease-out;
}

.nn-nav a:hover {
  color: var(--nn-text-main);
}

.nn-nav a:hover::after {
  width: 100%;
}

/* ===== HERO PANEL (Flock-style text over animation) ===== */

.nn-hero-panel {
  position: relative;
  z-index: 1;
  /* 90vh for animation + 90vh buffer = content appears right after animation ends */
  min-height: 180vh;
  background: transparent; /* let animation show through */
  padding-top: 2rem; /* give space under header */
}

.nn-hero-sticky {
  position: sticky;
  top: 0;
  height: 100vh;
}

.nn-hero-sentence {
  position: absolute;
  top: 90vh; /* JavaScript will animate this */
  left: 50%;
  transform: translateX(-50%);
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 600;
  margin: 0;
  max-width: none;
  color: #111111;
  text-shadow: 0 0 14px rgba(255, 255, 255, 0.8);
  white-space: nowrap; /* keeps it in one line */
  z-index: 10; /* stays above video */
  transition: top 0.05s linear; /* smooth but fast animation */
}

/* ===== Grids / cards ===== */

.nn-grid-2 {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 3rem;
  align-items: flex-start;
}

.nn-list {
  padding-left: 1.2rem;
  margin: 0.75rem 0 0 0;
  color: var(--nn-text-muted);
}

.nn-card-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.8rem;
}

.nn-card {
  border-radius: var(--nn-radius-md);
  padding: 1.5rem 1.4rem;
  border: 1px solid var(--nn-border-subtle);
  background-color: #ffffff;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.03);
}

.nn-card h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

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

/* Applications */

.nn-app-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
}

.nn-app-item h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
}

.nn-app-item p {
  margin: 0;
  color: var(--nn-text-muted);
}

/* ===== Buttons ===== */

.nn-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: var(--nn-radius-pill);
  font-size: 0.9rem;
  font-weight: 500;
  border: 1px solid transparent;
  text-decoration: none;
  cursor: pointer;
  transition:
    transform 0.1s ease-out,
    box-shadow 0.1s ease-out,
    background 0.1s ease-out,
    color 0.1s ease-out,
    border-color 0.1s ease-out;
}

.nn-button-primary {
  background: linear-gradient(135deg, var(--nn-accent-blue), var(--nn-accent-orange));
  color: #ffffff;
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.18);
}

.nn-button-primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.22);
}

.nn-button-ghost {
  border-color: var(--nn-border-subtle);
  color: var(--nn-text-main);
  background-color: #ffffff;
}

.nn-button-ghost:hover {
  border-color: var(--nn-accent-blue);
}

/* ===== Contact / form ===== */

.nn-contact {
  border-top: 1px solid var(--nn-border-subtle);
}

.nn-contact-highlight {
  margin-top: 1.2rem;
  font-weight: 500;
  color: var(--nn-accent-orange);
}

.nn-form {
  border-radius: var(--nn-radius-lg);
  padding: 1.5rem 1.4rem 1.6rem 1.4rem;
  background-color: #ffffff;
  border: 1px solid var(--nn-border-subtle);
  box-shadow: var(--nn-shadow-soft);
}

.nn-form-row {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.nn-form-row label {
  font-size: 0.82rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--nn-text-muted);
}

.nn-form-row input,
.nn-form-row textarea {
  border-radius: 999px;
  border: 1px solid #d1d1d6;
  padding: 0.6rem 0.9rem;
  font-size: 0.9rem;
  font-family: inherit;
  outline: none;
  transition:
    border-color 0.1s ease-out,
    box-shadow 0.1s ease-out,
    border-radius 0.1s ease-out;
}

.nn-form-row textarea {
  border-radius: 16px;
  resize: vertical;
  min-height: 130px;
}

.nn-form-row input:focus,
.nn-form-row textarea:focus {
  border-color: var(--nn-accent-blue);
  box-shadow: 0 0 0 1px rgba(0, 123, 255, 0.35);
}

/* ===== Footer ===== */

.nn-footer {
  border-top: 1px solid var(--nn-border-subtle);
  padding: 1.5rem 0 2rem 0;
  background-color: #ffffff;
}

.nn-footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--nn-text-muted);
}

.nn-footer-accent {
  color: var(--nn-accent-blue);
}

/* ===== Full-screen background animation ===== */

.nn-bg-animation {
  position: fixed;
  inset: 0;
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 1;
  transition: opacity 0.5s ease-out;
  background-color: #fef7f1; /* beige-ish */
}

/* Cover noisy black bands on the sides with clean black */
.nn-bg-animation::before,
.nn-bg-animation::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  width: 25%;
  z-index: 2;
  background: #000;
}
.nn-bg-animation::before {
  left: 0;
}
.nn-bg-animation::after {
  right: 0;
}

/* Hide black bands on mobile */
@media (max-width: 768px) {
  .nn-bg-animation::before,
  .nn-bg-animation::after {
    display: none;
  }
}

.nn-bg-frame {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0;
  transition: opacity 0.5s ease;
  z-index: 1;
}

.nn-bg-frame.active {
  opacity: 1;
}

/* .nn-bg-animation::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;

  background:
    linear-gradient(
      to right,
      #f7f7f7 0,   #f7f7f7 9%,   
      transparent 9%, transparent 91%,
      #f7f7f7 91%, #f7f7f7 100%  
    );
} */

/* once the hero is done, reveal them */
body.nn-after-hero .nn-section {
  opacity: 1;
  transform: translateY(0);
}

/* Hide background animation after hero section */
body.nn-after-hero .nn-bg-animation {
  opacity: 0;
  pointer-events: none;
}

/* Base lab colors / styling */

.lab-bg {
  fill: #f5f7fb;
}
.lab-table {
  fill: #eceff7;
}
.lab-skin {
  fill: #ffcc99;
}
.lab-coat {
  fill: #ffffff;
  stroke: var(--nn-accent-blue);
  stroke-width: 3;
}
.lab-hair {
  fill: var(--nn-accent-blue);
}
.lab-arm {
  stroke: var(--nn-accent-blue);
  fill: none;
}
.lab-beaker {
  fill: var(--nn-accent-blue);
}
.lab-test-tube {
  fill: #ffffff;
  stroke: var(--nn-accent-blue);
  stroke-width: 2;
}
.lab-liquid {
  fill: var(--nn-accent-orange);
}
.lab-tube-glow {
  fill: rgba(255, 122, 26, 0.25);
}
.lab-liquid-stream {
  stroke: var(--nn-accent-orange);
}
.lab-label {
  fill: #82889a;
  font-size: 11px;
  font-family: "Space Grotesk", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* Links */

.lab-link-vertical {
  fill: var(--nn-accent-orange);
  stroke: var(--nn-accent-blue);
  stroke-width: 3;
}

.lab-chain-link {
  fill: none;
  stroke: var(--nn-accent-blue);
  stroke-width: 4;
}
.lab-chain-link-orange {
  fill: none;
  stroke: var(--nn-accent-orange);
  stroke-width: 4;
}

/* Smooth transitions between scroll stages */
.lab-ground,
.lab-beaker-group,
.lab-liquid-stream,
.lab-tube-glow,
.lab-link-flying,
.lab-chain-final {
  transition:
    opacity 0.45s ease-out,
    transform 0.6s ease-out;
}

/* ===== Scroll stages (frame-based) ===== */

/* Stage 0 – scientist idle, nothing happening */
body.nn-stage-0 .lab-beaker-group {
  transform-origin: center;
  transform: rotate(0deg);
}
body.nn-stage-0 .lab-liquid-stream,
body.nn-stage-0 .lab-tube-glow,
body.nn-stage-0 .lab-link-flying,
body.nn-stage-0 .lab-chain-final {
  opacity: 0;
}
body.nn-stage-0 .lab-ground {
  opacity: 1;
  transform: translateY(0);
}

/* Stage 1 – pouring into tube */
body.nn-stage-1 .lab-beaker-group {
  transform-origin: center;
  transform: rotate(-22deg);
}
body.nn-stage-1 .lab-liquid-stream,
body.nn-stage-1 .lab-tube-glow {
  opacity: 1;
}
body.nn-stage-1 .lab-link-flying,
body.nn-stage-1 .lab-chain-final {
  opacity: 0;
}
body.nn-stage-1 .lab-ground {
  opacity: 1;
  transform: translateY(0);
}

/* Stage 2 – liquid became a vertical link that shoots up left */
body.nn-stage-2 .lab-beaker-group {
  transform-origin: center;
  transform: rotate(-10deg);
}
body.nn-stage-2 .lab-liquid-stream,
body.nn-stage-2 .lab-tube-glow {
  opacity: 0;
}
body.nn-stage-2 .lab-link-flying {
  opacity: 1;
  transform: translate(-42px, -90px) rotate(-8deg); /* diagonal up-left */
}
body.nn-stage-2 .lab-chain-final {
  opacity: 0;
}
body.nn-stage-2 .lab-ground {
  opacity: 1;
  transform: translateY(0);
}

/* Stage 3 – ground slides down, final chain appears at top */
body.nn-stage-3 .lab-beaker-group {
  transform-origin: center;
  transform: rotate(0deg);
}
body.nn-stage-3 .lab-liquid-stream,
body.nn-stage-3 .lab-tube-glow,
body.nn-stage-3 .lab-link-flying {
  opacity: 0;
}
body.nn-stage-3 .lab-ground {
  opacity: 0;
  transform: translateY(40px);
}
body.nn-stage-3 .lab-chain-final {
  opacity: 1;
  transform: translate(0, 0);
}

/* Optional subtle background tint per stage */
body.nn-stage-0 {
  background: radial-gradient(circle at 0% 0%, #e4f0ff, #ffffff);
}
body.nn-stage-1 {
  background: radial-gradient(circle at 0% 0%, #dcecff, #fff7f0);
}
body.nn-stage-2 {
  background: radial-gradient(circle at 0% 0%, #ffd7b3, #ffffff);
}
body.nn-stage-3 {
  background: radial-gradient(circle at 0% 0%, #ffe0bf, #fff7ed);
}

/* ===== Responsive ===== */

@media (max-width: 960px) {
  .nn-header-inner {
    flex-wrap: wrap;
  }

  .nn-grid-2,
  .nn-card-grid,
  .nn-app-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .nn-hero-panel {
    padding-top: 5rem;
    min-height: 200vh;
  }

  .nn-hero-sticky {
    top: 40vh;
  }
}

@media (max-width: 640px) {
  .nn-container {
    padding: 0 1.1rem;
  }

  .nn-nav {
    gap: 1rem;
    font-size: 0.82rem;
  }

  .nn-section {
    padding: 3.75rem 0;
  }
}

@media (max-width: 768px) {
  /* Always show content on mobile */
  .nn-section {
    opacity: 1;
    transform: none;
  }

  /* Don’t fade out the background animation on mobile */
  .nn-bg-animation {
    opacity: 1;
  }

  body.nn-after-hero .nn-bg-animation {
    opacity: 1;
  }

  .nn-hero-sentence {
    position: absolute;
    top: 23rem;
    left: 50%;
    transform: translateX(-50%);
    width: 90%;
    max-width: 22rem;
    font-size: clamp(1.1rem, 4vw, 1.4rem);
    text-align: center;
    white-space: normal; /* allow wrapping */
  }  
}

@media (max-width: 768px) {
  .nn-hero-panel {
    min-height: 220vh;   /* was 220vh */
    padding-bottom: 110vh; /* was 80vh */
  }
}