/* ============================================================
   NDZ Labs — Design System
   Background: #111d4a | Headers: #f72585 | Texts: #4cc9f0 | CTA: #fffeee
   ============================================================ */

:root {
  --bg: #111d4a;
  --header: #f72585;
  --text: #4cc9f0;
  --cta: #fffeee;
  --bg-soft: rgba(76, 201, 240, 0.06);
  --line: rgba(76, 201, 240, 0.22);
  --font-head: "Boldonse", system-ui, sans-serif;
  --font-body: "Abel", system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 76px;
}

body {
  font-family: var(--font-body);
  font-size: 1.125rem;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
}

button {
  font-family: inherit;
  cursor: pointer;
}

h1, h2, h3 {
  font-family: var(--font-head);
  font-weight: 400;
  color: var(--header);
  line-height: 1.15;
}

.container {
  width: 100%;
  max-width: 1120px;
  margin-inline: auto;
  padding-inline: 1.5rem;
}

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 0.95rem;
  color: var(--cta);
  border: 1px solid var(--header);
  background: var(--header);
  padding: 0.85rem 1.75rem;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background 0.2s ease, color 0.2s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(247, 37, 133, 0.35);
}

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--text);
}

.btn--ghost:hover {
  border-color: var(--text);
  box-shadow: 0 8px 24px rgba(76, 201, 240, 0.2);
}

.btn--large {
  padding: 1rem 2.25rem;
  font-size: 1.05rem;
}

/* ---------- Header / Nav ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color 0.35s ease, border-color 0.35s ease, box-shadow 0.35s ease;
}

.site-header.is-scrolled {
  background: rgba(17, 29, 74, 0.94);
  border-bottom-color: var(--line);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.35);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.nav {
  display: flex;
  align-items: center;
  gap: 1.5rem;
  height: 76px;
}

.nav__logo,
.cta__brand,
.footer__brand {
  font-family: var(--font-head);
  color: var(--cta);
}

.nav__logo {
  font-size: 1.35rem;
  white-space: nowrap;
}

.nav__logo span,
.footer__brand span {
  color: var(--header);
}

.nav__links {
  display: flex;
  align-items: center;
  gap: 1.4rem;
  list-style: none;
  margin-inline: auto;
}

.nav__links a {
  font-size: 0.95rem;
  color: var(--text);
  transition: color 0.2s ease;
}

.nav__links a:hover {
  color: var(--cta);
}

.nav__cta {
  padding: 0.6rem 1.25rem;
  font-size: 0.85rem;
  white-space: nowrap;
}

.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  padding: 0.5rem;
  background: transparent;
  border: 1px solid var(--line);
}

.nav__toggle span {
  display: block;
  height: 2px;
  width: 100%;
  background: var(--cta);
  transition: transform 0.25s ease, opacity 0.25s ease;
}

.nav__toggle.is-open span:nth-child(1) {
  transform: translateY(7px) rotate(45deg);
}

.nav__toggle.is-open span:nth-child(2) {
  opacity: 0;
}

.nav__toggle.is-open span:nth-child(3) {
  transform: translateY(-7px) rotate(-45deg);
}

/* ---------- Sections ---------- */
.section {
  padding: 6rem 0;
  scroll-margin-top: 76px;
}

.section__title {
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  margin-bottom: 1rem;
}

.section__lede {
  max-width: 560px;
  margin-bottom: 3rem;
}

/* ---------- Thesis ---------- */
.thesis,
.system-flow,
.agents__intro-wrap {
  max-width: 74ch;
}

.thesis__lead,
.proof__lead,
.loop__lead {
  font-family: var(--font-head);
  color: var(--header);
}

.thesis__lead {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: 1.5rem;
}

.thesis__text,
.system-flow__intro,
.agents__intro {
  font-size: 1.15rem;
  margin-bottom: 1.25rem;
}

.thesis__text--emphasis {
  color: var(--cta);
  font-size: 1.25rem;
}

.thesis__list,
.product-list,
.learnings {
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.thesis__list {
  margin: 2rem 0;
}

.thesis__list li,
.product-list li {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
  border: 1px solid var(--line);
  background: var(--bg-soft);
}

.thesis__list li {
  font-size: 1.15rem;
  padding: 1rem 1.25rem;
}

.thesis__list li::before,
.product-list li::before {
  content: "";
  flex-shrink: 0;
  width: 0.85rem;
  height: 0.85rem;
  margin-top: 0.42rem;
  background: var(--header);
  box-shadow: 0 0 0 3px rgba(247, 37, 133, 0.25);
}

/* ---------- Core Idea ---------- */
.core-idea__statement {
  font-family: var(--font-head);
  font-size: clamp(2rem, 5.5vw, 4.5rem);
  line-height: 1.1;
  color: var(--cta);
  max-width: 20ch;
  margin: 0 0 4rem;
}

/* ---------- Hero ---------- */
.hero {
  min-height: 100vh;
  min-height: 100svh;
  display: flex;
  align-items: center;
  padding: 120px 0 60px;
  background:
    radial-gradient(60% 60% at 85% 15%, rgba(247, 37, 133, 0.18), transparent 60%),
    radial-gradient(50% 50% at 10% 85%, rgba(76, 201, 240, 0.14), transparent 60%);
  background-attachment: fixed;
}

.hero__eyebrow,
.product-hero__eyebrow {
  font-family: var(--font-head);
  text-transform: uppercase;
  color: var(--text);
}

.hero__eyebrow {
  font-size: 0.9rem;
  letter-spacing: 0.35em;
  margin-bottom: 1.5rem;
}

.hero__title {
  font-size: clamp(2.2rem, 6vw, 4.5rem);
  max-width: 14ch;
  margin-bottom: 1.5rem;
}

.hero__subtitle {
  font-size: clamp(1.1rem, 2.4vw, 1.4rem);
  max-width: 58ch;
  margin-bottom: 1.5rem;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 2.5rem;
}

.hero__tags span {
  font-family: var(--font-head);
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--text);
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 0.45rem 0.95rem;
}

.hero__micro {
  max-width: 56ch;
  margin-top: 1.75rem;
  font-size: 0.95rem;
  opacity: 0.85;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

/* ---------- 404 ---------- */
.error-hero__title {
  font-size: clamp(6rem, 24vw, 12rem);
  line-height: 1;
  color: var(--header);
  text-shadow: 0 0 40px rgba(247, 37, 133, 0.35);
  margin-bottom: 1rem;
  animation: error-glow 3.5s ease-in-out infinite;
}

@keyframes error-glow {
  0%,
  100% {
    text-shadow: 0 0 40px rgba(247, 37, 133, 0.35);
  }
  50% {
    text-shadow: 0 0 90px rgba(247, 37, 133, 0.6);
  }
}

/* ---------- Scroll reveal ---------- */
.js .reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.7s ease, transform 0.7s ease;
  will-change: opacity, transform;
}

.js .reveal.is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- Grid / Cards ---------- */
.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
}

/* ---------- Development System ---------- */
.system-flow__intro:last-of-type,
.agents__intro-wrap .agents__intro:last-child {
  margin-bottom: 3rem;
}

.system-stage {
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 1.75rem;
}

.system-stage--final {
  border-left: 3px solid var(--header);
}

.system-stage__head {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 0.75rem;
}

.system-stage__num {
  font-family: var(--font-head);
  font-size: 0.95rem;
  color: var(--bg);
  background: var(--header);
  padding: 0.35rem 0.7rem;
  flex-shrink: 0;
}

.system-stage__title {
  font-size: 1.5rem;
}

.system-stage__text {
  font-size: 1.1rem;
  margin-bottom: 1.25rem;
}

.system-stage__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.system-stage__tags li,
.proof-card__tags li {
  font-family: var(--font-head);
  font-size: 0.8rem;
  letter-spacing: 0.06em;
  color: var(--text);
  border: 1px solid var(--line);
  padding: 0.3rem 0.75rem;
}

.system-flow__arrow {
  display: block;
  text-align: center;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--header);
  margin: 1.4rem 0;
}

/* ---------- Agentic Architecture ---------- */
.agent,
.about__card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  border-top: 3px solid var(--header);
}

.agent {
  padding: 2rem 1.75rem;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.agent:hover,
.agnostic-card:hover,
.proof-card:hover {
  transform: translateY(-4px);
  border-color: var(--header);
}

.agent__title,
.agnostic-card__title {
  font-size: 1.2rem;
  margin-bottom: 0.75rem;
}

.agent__text {
  font-size: 1.05rem;
}

/* ---------- Agnostic Layer ---------- */
.agnostic__lead {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  color: var(--cta);
  max-width: 24ch;
  margin-bottom: 1rem;
}

.agnostic__accent,
.statement--accent {
  color: var(--header);
}

.agnostic__intro {
  max-width: 56ch;
  font-size: 1.15rem;
  margin-bottom: 3rem;
}

.agnostic-card {
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 1.75rem;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.agnostic-card__tag {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  color: var(--bg);
  background: var(--text);
  padding: 0.3rem 0.6rem;
  margin-bottom: 1rem;
}

.agnostic-card__text,
.proof-card__text {
  font-size: 1.05rem;
  margin-bottom: 0.75rem;
}

.agnostic-card__text:last-child {
  margin-bottom: 0;
}

.agnostic-stack {
  max-width: 30rem;
  margin: 4rem auto;
  text-align: center;
}

.agnostic-stack__step {
  font-family: var(--font-head);
  font-size: clamp(1rem, 2.4vw, 1.35rem);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text);
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 1rem 1.5rem;
}

.agnostic-stack__step--any {
  color: var(--cta);
  border-color: var(--header);
  box-shadow: 0 0 0 1px var(--header), 0 16px 48px rgba(247, 37, 133, 0.2);
}

.agnostic-stack__step--final,
.rd-loop__step--build {
  color: var(--bg);
  background: var(--header);
  border-color: var(--header);
}

.agnostic-stack__arrow,
.rd-loop__arrow {
  display: block;
  font-size: 1.4rem;
  line-height: 1;
  color: var(--header);
  margin: 1.2rem 0;
}

.agnostic__closing {
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.6vw, 2.6rem);
  line-height: 1.15;
  text-align: center;
  max-width: 26ch;
  margin: 0 auto;
  color: var(--text);
}

.agnostic__muted {
  color: var(--text);
}

/* ---------- First Product / Proof ---------- */
.proof__lead {
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  margin-bottom: 0.75rem;
}

.proof-grid {
  grid-template-columns: 1fr 1fr;
  margin-bottom: 1.5rem;
}

.proof-card {
  display: flex;
  flex-direction: column;
  background: var(--bg-soft);
  border: 1px solid var(--line);
  padding: 2rem;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.proof-card__num {
  font-family: var(--font-head);
  font-size: 0.85rem;
  color: var(--header);
  letter-spacing: 0.2em;
  margin-bottom: 0.75rem;
}

.proof-card__title {
  font-size: 1.4rem;
  margin-bottom: 0.75rem;
}

.proof-card__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 1rem 0 1.5rem;
}

.proof-card .btn {
  margin-top: auto;
  align-self: flex-start;
}

.proof-strip {
  border: 1px dashed var(--line);
  background: var(--bg-soft);
  padding: 2rem;
}

.proof-strip__title {
  font-size: 1.25rem;
  margin-bottom: 0.75rem;
}

.proof-strip__text {
  max-width: 60ch;
  font-size: 1.05rem;
}

/* ---------- R&D Loop ---------- */
.loop__lead {
  font-size: clamp(1.5rem, 3.4vw, 2.4rem);
  max-width: 26ch;
  margin-bottom: 1rem;
}

.loop__intro {
  max-width: 46ch;
  margin-bottom: 3rem;
}

.loop__intro-line {
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.rd-loop {
  max-width: 30rem;
  margin: 0 auto 3rem;
  text-align: center;
}

.rd-loop__step {
  font-family: var(--font-head);
  font-size: clamp(1rem, 2.4vw, 1.3rem);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--text);
  border: 1px solid var(--line);
  background: var(--bg-soft);
  padding: 1rem 1.5rem;
}

.rd-loop__step--speed {
  color: var(--cta);
  border-color: var(--header);
  box-shadow: 0 0 0 1px var(--header);
}

.rd-loop__back {
  display: inline-block;
  margin-top: 1.5rem;
  font-size: 2.2rem;
  line-height: 1;
  color: var(--header);
}

.loop__closing {
  text-align: center;
  max-width: 44ch;
  margin: 0 auto;
}

.loop__closing-line {
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.loop__closing-line--accent {
  font-family: var(--font-head);
  font-size: clamp(1.4rem, 3vw, 2.2rem);
  color: var(--header);
}

/* ---------- About / Founder ---------- */
.about {
  display: grid;
  grid-template-columns: 1.2fr 0.8fr;
  gap: 3rem;
  align-items: start;
}

.about__name {
  font-size: clamp(1.4rem, 3vw, 2rem);
  margin-bottom: 1.25rem;
}

.about__text {
  font-size: 1.1rem;
  margin-bottom: 1.1rem;
}

.about__card {
  padding: 2rem;
}

.about__tagline {
  font-family: var(--font-head);
  font-size: 1.15rem;
  color: var(--cta);
  margin-bottom: 1.75rem;
}

/* ---------- Product case page ---------- */
.product-hero {
  padding: 170px 0 70px;
  background:
    radial-gradient(55% 55% at 85% 15%, rgba(247, 37, 133, 0.16), transparent 60%),
    radial-gradient(45% 45% at 10% 85%, rgba(76, 201, 240, 0.12), transparent 60%);
  background-attachment: fixed;
}

.product-hero__eyebrow {
  font-size: 0.85rem;
  letter-spacing: 0.3em;
  margin-bottom: 1.25rem;
}

.product-hero__title {
  font-size: clamp(2.2rem, 6vw, 4rem);
  max-width: 20ch;
  margin-bottom: 1.5rem;
}

.product-hero__subtitle {
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  max-width: 62ch;
}

.product-text {
  max-width: 74ch;
  font-size: 1.15rem;
  line-height: 1.65;
  margin-bottom: 1.25rem;
}

.product-list {
  max-width: 74ch;
  margin-top: 1.5rem;
}

.product-list li {
  font-size: 1.1rem;
  padding: 0.9rem 1.25rem;
}

.learnings {
  max-width: 74ch;
  margin-top: 3rem;
}

.learning {
  border: 1px solid var(--line);
  border-left: 3px solid var(--header);
  background: var(--bg-soft);
  padding: 1rem 1.25rem;
  font-size: 1.1rem;
}

/* ---------- Essay / product page additions ---------- */
.statement {
  font-family: var(--font-head);
  font-size: clamp(1.3rem, 3vw, 1.9rem);
  line-height: 1.3;
  color: var(--cta);
  max-width: 48ch;
  margin: 2.5rem 0;
}

.roles-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  margin: 2rem 0 1.5rem;
}

.roles-flow .rd-loop__step {
  margin: 0;
}

.roles-flow__arrow {
  font-size: 1.4rem;
  line-height: 1;
  color: var(--header);
}

.workflow {
  max-width: 34rem;
  margin: 3rem auto 0;
}

.breakdown {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
}

.breakdown__title,
.subheading {
  font-size: 1.4rem;
}

.breakdown__title {
  margin-bottom: 1rem;
}

.subheading {
  margin: 2.5rem 0 0.75rem;
}

/* ---------- CTA ---------- */
.section--cta {
  background: radial-gradient(70% 90% at 50% 100%, rgba(247, 37, 133, 0.22), transparent 70%);
}

.cta {
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.cta__title {
  font-size: clamp(1.75rem, 4vw, 3rem);
  max-width: 20ch;
}

.cta__lead {
  font-family: var(--font-head);
  font-size: clamp(1.2rem, 2.6vw, 1.6rem);
  color: var(--cta);
}

.cta__text {
  margin-bottom: 0.75rem;
}

.cta__foot {
  margin-top: 3rem;
  padding-top: 2rem;
  border-top: 1px solid var(--line);
  text-align: center;
  width: 100%;
  max-width: 40ch;
}

.cta__brand {
  margin-bottom: 0.25rem;
}

.cta__footline {
  font-size: 0.95rem;
}

/* ---------- Footer ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  padding: 2rem 0;
}

.footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.footer__copy {
  font-size: 0.9rem;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 1400px) {
  .nav__cta {
    display: none;
  }
}

@media (max-width: 1200px) {
  .nav__links {
    gap: 1.1rem;
  }

  .nav__links a {
    font-size: 0.9rem;
  }
}

@media (max-width: 1000px) {
  .nav__links {
    gap: 0.8rem;
  }

  .nav__links a {
    font-size: 0.8rem;
  }
}

@media (max-width: 900px) {
  .grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .about {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 768px) {
  html {
    scroll-padding-top: 66px;
  }

  .nav {
    height: 66px;
  }

  .nav__toggle {
    display: flex;
    margin-left: auto;
  }

  .nav__links {
    position: fixed;
    top: 66px;
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    margin: 0;
    background: var(--bg);
    border-bottom: 1px solid var(--line);
    padding: 0.5rem 1.5rem 1rem;
    transform: translateY(-130%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.3s ease, opacity 0.3s ease, visibility 0.3s ease;
  }

  .nav__links.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav__links a {
    display: block;
    padding: 0.85rem 0;
    border-bottom: 1px solid var(--line);
    width: 100%;
  }

  .nav__links li:last-child a {
    border-bottom: none;
  }

  .section {
    padding: 4.5rem 0;
  }

  .hero {
    padding-top: 96px;
  }
}

@media (max-width: 560px) {
  .grid {
    grid-template-columns: 1fr;
  }

  .hero__eyebrow {
    letter-spacing: 0.25em;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .hero,
  .product-hero {
    background-attachment: scroll;
  }

  *,
  *::before,
  *::after {
    transition: none !important;
    animation: none !important;
  }

  .js .reveal {
    opacity: 1;
    transform: none;
  }
}

/* ---------- Parallax fallback on touch / narrow screens ---------- */
@media (hover: none), (max-width: 768px) {
  .hero,
  .product-hero {
    background-attachment: scroll;
  }
}

/* ---------- Focus ---------- */
:focus-visible {
  outline: 2px solid var(--text);
  outline-offset: 2px;
}

/* ---------- Scrollbar (design system) ---------- */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--header) var(--bg);
}

::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}

::-webkit-scrollbar-track {
  background: var(--bg);
}

::-webkit-scrollbar-thumb {
  background: var(--header);
  border: 2px solid var(--bg);
  border-radius: 6px;
}

::-webkit-scrollbar-thumb:hover {
  background: var(--text);
}

::-webkit-scrollbar-corner {
  background: var(--bg);
}