/* ============================================================
   Rocketengine — Design & Product Studio
   Swiss Design System / Fibonacci Grid / Pure B&W
   ============================================================ */

/* --- Reset & Base --- */

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

:root {
  /* Fibonacci spacing scale (px): 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144 */
  --sp-1: 0.0625rem;   /* 1 */
  --sp-2: 0.125rem;    /* 2 */
  --sp-3: 0.1875rem;   /* 3 */
  --sp-5: 0.3125rem;   /* 5 */
  --sp-8: 0.5rem;      /* 8 */
  --sp-13: 0.8125rem;  /* 13 */
  --sp-21: 1.3125rem;  /* 21 */
  --sp-34: 2.125rem;   /* 34 */
  --sp-55: 3.4375rem;  /* 55 */
  --sp-89: 5.5625rem;  /* 89 */
  --sp-144: 9rem;      /* 144 */
  --sp-233: 14.5625rem;/* 233 */

  /* Color — inverted B&W */
  --black: #FFFFFF;
  --white: #000000;
  --grey-subtle: #1A1A1A;
  --grey-mid: #777777;

  /* Typography */
  --font-display: 'Space Grotesk', sans-serif;
  --font-body: 'Inter', sans-serif;

  /* Grid */
  --grid-columns: 12;
  --grid-gap: var(--sp-21);
  --content-max: 1320px;
  --content-padding: var(--sp-34);

  /* Timing */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --duration-reveal: 0.8s;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-body);
  font-weight: 300;
  line-height: 1.6;
  color: var(--black);
  background-color: var(--white);
}

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

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

::selection {
  background: var(--black);
  color: var(--white);
}


/* --- Typography Scale (Fibonacci-derived) --- */

.hero__headline {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2rem, 5.5vw, 4.5rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.hero__line {
  display: block;
  position: relative;
  overflow: hidden;
  cursor: default;
}

.hero__text,
.hero__hover {
  display: block;
  transition: transform 0.5s var(--ease-out);
  will-change: transform;
}

.hero__hover {
  position: absolute;
  top: 0;
  left: 0;
  transform: translateY(110%);
  color: var(--grey-mid);
}

.hero__line:hover .hero__text {
  transform: translateY(-110%);
}

.hero__line:hover .hero__hover {
  transform: translateY(0);
}

.hero__descriptor {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 0.875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.hero__since {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.875rem;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--grey-mid);
}

.label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
}

.label__index {
  display: block;
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--grey-mid);
  margin-top: var(--sp-8);
}

.body-large {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(1.25rem, 2.5vw, 1.75rem);
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.body-text {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--grey-mid);
  max-width: 55ch;
  margin-top: var(--sp-21);
}

/* --- Navigation --- */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--white);
  border-bottom: 1px solid var(--grey-subtle);
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--sp-21) var(--content-padding);
}

.nav__wordmark {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.125rem;
  letter-spacing: -0.02em;
}

.nav__contact {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: var(--sp-8) var(--sp-21);
  border: 1px solid var(--black);
  transition: background 0.2s var(--ease-out), color 0.2s var(--ease-out);
}

.nav__contact:hover {
  background: var(--black);
  color: var(--white);
}

.nav__contact:focus-visible {
  outline: 2px solid var(--black);
  outline-offset: 2px;
}

/* --- Hero --- */

.hero {
  position: relative;
  padding-top: calc(var(--sp-144) + var(--sp-55));
  padding-bottom: var(--sp-144);
  padding-left: var(--content-padding);
  padding-right: var(--content-padding);
  max-width: var(--content-max);
  margin: 0 auto;
}

.hero__shader {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100vw;
  height: 100%;
  z-index: 0;
  opacity: 0.15;
  pointer-events: none;
}

.hero__shader canvas {
  display: block;
  width: 100% !important;
  height: 100% !important;
}

.hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-89);
  align-items: end;
}

.hero__content {
  display: flex;
  flex-direction: column;
  gap: var(--sp-55);
}

.hero__meta {
  display: flex;
  gap: var(--sp-34);
  align-items: baseline;
}

.hero__fibonacci {
  display: flex;
  justify-content: flex-end;
  align-items: flex-end;
  color: var(--grey-subtle);
}

.hero__spiral {
  width: 100%;
  max-width: 377px;
}

/* --- Divider --- */

.divider {
  border: none;
  border-top: 1px solid var(--grey-subtle);
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

/* --- Sections --- */

.section {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: var(--sp-89) var(--content-padding);
}

.section__grid {
  display: grid;
  grid-template-columns: 1fr 2fr;
  gap: var(--sp-89);
  align-items: start;
}

/* --- Approach --- */

.approach__items {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--sp-34);
}

.approach__number {
  display: block;
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.75rem;
  letter-spacing: 0.15em;
  color: var(--grey-mid);
  margin-bottom: var(--sp-13);
}

.approach__title {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 1.125rem;
  letter-spacing: -0.01em;
  margin-bottom: var(--sp-13);
}

.approach__text {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.9375rem;
  line-height: 1.6;
  color: var(--grey-mid);
}

/* --- Signal / CTA --- */

.signal__cta {
  margin-top: var(--sp-55);
}

.cta {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  padding: var(--sp-13) var(--sp-34);
  border: 1px solid var(--black);
  display: inline-block;
  transition: background 0.2s var(--ease-out), color 0.2s var(--ease-out);
}

.cta:hover {
  background: var(--black);
  color: var(--white);
}

.cta:focus-visible {
  outline: 2px solid var(--black);
  outline-offset: 2px;
}

/* --- Founder --- */

.founder__header {
  margin-bottom: var(--sp-34);
}

.founder__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.founder__role {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.9375rem;
  color: var(--grey-mid);
  margin-top: var(--sp-8);
  letter-spacing: 0.02em;
}

/* Impact stat */

.founder__impact {
  margin-bottom: var(--sp-55);
  padding: var(--sp-34) 0;
  border-top: 1px solid var(--grey-subtle);
  border-bottom: 1px solid var(--grey-subtle);
}

.founder__stats-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-55);
}

.founder__stat {
  display: flex;
  align-items: baseline;
  gap: var(--sp-21);
}

.founder__stat-number {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2.5rem, 5vw, 4rem);
  letter-spacing: -0.03em;
  line-height: 1;
}

.founder__stat-label {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.9375rem;
  color: var(--grey-mid);
  max-width: 20ch;
  line-height: 1.4;
}

.founder__bio {
  margin-bottom: var(--sp-55);
}

.founder__disciplines {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--sp-34);
  margin-bottom: var(--sp-55);
  padding-top: var(--sp-34);
  border-top: 1px solid var(--grey-subtle);
}

.founder__discipline-label {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.75rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  margin-bottom: var(--sp-13);
}

.founder__discipline-list {
  list-style: none;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--sp-8);
}

.founder__discipline-list li {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.9375rem;
  line-height: 1.5;
  color: var(--grey-mid);
}

/* GitHub stats */

.founder__github {
  margin-bottom: var(--sp-55);
  padding-top: var(--sp-34);
  border-top: 1px solid var(--grey-subtle);
}

.founder__github-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-21);
}

.founder__github-stat {
  display: flex;
  flex-direction: column;
  gap: var(--sp-5);
}

.founder__github-value {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: -0.02em;
  line-height: 1;
}

.founder__github-label {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--grey-mid);
  letter-spacing: 0.05em;
}

.founder__links {
  padding-top: var(--sp-34);
  border-top: 1px solid var(--grey-subtle);
  display: flex;
  gap: var(--sp-34);
}

.founder__link {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-8);
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: var(--sp-8) 0;
  transition: opacity 0.2s var(--ease-out);
}

.founder__link:hover {
  opacity: 0.6;
}

.founder__link:focus-visible {
  outline: 2px solid var(--black);
  outline-offset: 2px;
}

.founder__link-arrow {
  font-size: 1.125rem;
}

/* --- Principles --- */

.principles {
  padding: var(--sp-89) var(--content-padding) var(--sp-144);
}

.principles__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--sp-34);
}

.principles__item {
  display: flex;
  align-items: flex-start;
  gap: var(--sp-13);
}

.principles__marker {
  display: block;
  width: 8px;
  height: 8px;
  background: var(--black);
  flex-shrink: 0;
  margin-top: 0.35em;
}

.principles__text {
  font-family: var(--font-display);
  font-weight: 400;
  font-size: 1rem;
  line-height: 1.5;
  letter-spacing: -0.01em;
}

/* --- Footer --- */

.footer {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 0 var(--content-padding);
}

.footer__grid {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  padding: var(--sp-34) 0 var(--sp-55);
}

.footer__left {
  display: flex;
  gap: var(--sp-21);
  align-items: baseline;
}

.footer__name {
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 0.875rem;
  letter-spacing: -0.01em;
}

.footer__center {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.8125rem;
}

.footer__copy {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.75rem;
  color: var(--grey-mid);
}

.footer__link {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: 0.8125rem;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--grey-subtle);
  transition: border-color 0.2s var(--ease-out);
}

.footer__link:hover {
  border-color: var(--black);
}

.footer__link:focus-visible {
  outline: 2px solid var(--black);
  outline-offset: 2px;
}

/* --- Reveal Animations --- */

.reveal {
  opacity: 0;
  transform: translateY(var(--sp-21));
  transition:
    opacity var(--duration-reveal) var(--ease-out),
    transform var(--duration-reveal) var(--ease-out);
}

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

.reveal--delay-1 {
  transition-delay: 0.15s;
}

.reveal--delay-2 {
  transition-delay: 0.3s;
}

.reveal--delay-3 {
  transition-delay: 0.45s;
}

/* --- Reduced Motion --- */

@media (prefers-reduced-motion: reduce) {
  .reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .hero__text,
  .hero__hover {
    transition: none;
  }
}

/* --- Responsive --- */

/* Tablet */
@media (max-width: 1024px) {
  :root {
    --content-padding: var(--sp-34);
  }

  .hero__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-55);
  }

  .hero__fibonacci {
    justify-content: flex-start;
  }

  .hero__spiral {
    max-width: 280px;
  }

  .section__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-34);
  }

  .approach__items {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--sp-21);
  }

  .principles__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-21);
  }
}

/* Mobile */
@media (max-width: 640px) {
  :root {
    --content-padding: var(--sp-21);
  }

  .hero {
    padding-top: calc(var(--sp-89) + var(--sp-55));
    padding-bottom: var(--sp-89);
  }

  .hero__content {
    gap: var(--sp-34);
  }

  .hero__meta {
    flex-direction: column;
    gap: var(--sp-8);
  }

  .hero__fibonacci {
    display: none;
  }

  .section {
    padding: var(--sp-55) var(--content-padding);
  }

  .approach__items {
    grid-template-columns: 1fr;
    gap: var(--sp-34);
  }

  .founder__disciplines {
    grid-template-columns: 1fr;
    gap: var(--sp-34);
  }

  .founder__stats-row {
    grid-template-columns: 1fr;
    gap: var(--sp-34);
  }

  .founder__stat {
    flex-direction: column;
    gap: var(--sp-13);
  }

  .founder__stat-label {
    max-width: none;
  }

  .founder__github-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--sp-21);
  }

  .founder__links {
    flex-direction: column;
    gap: var(--sp-21);
  }

  .approach__item {
    padding-bottom: var(--sp-34);
    border-bottom: 1px solid var(--grey-subtle);
  }

  .approach__item:last-child {
    border-bottom: none;
    padding-bottom: 0;
  }

  .principles__grid {
    grid-template-columns: 1fr;
    gap: var(--sp-21);
  }

  .principles {
    padding-bottom: var(--sp-89);
  }

  .footer__grid {
    flex-direction: column;
    gap: var(--sp-13);
  }
}