@font-face {
  font-family: 'PP Cirka';
  src: url('../fonts/PPCirka-Variable.ttf') format('truetype-variations'),
       url('../fonts/PPCirka-Variable.ttf') format('truetype');
  font-weight: 300 700;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'PP Cirka';
  src: url('../fonts/PPCirka-Light.otf') format('opentype');
  font-weight: 300;
  font-style: normal;
  font-display: swap;
}

@font-face {
  font-family: 'PP Cirka';
  src: url('../fonts/PPCirka-Bold.otf') format('opentype');
  font-weight: 700;
  font-style: normal;
  font-display: swap;
}

:root {
  --night:  #252527;
  --dim:    #5d5d5a;   /* background stars */
  --bright: #f2f2e4;   /* foreground stars */
  --moon:   #f5eed7;
  --streak: #eceff4;   /* shooting stars */
  --header-font: 'PP Cirka', ui-serif, serif;
  --body-font:   'inclusive-sans', ui-sans-serif, system-ui, sans-serif;
  --font-mono:   'cofo-sans-mono-variable', ui-monospace, SFMono-Regular, Menlo, monospace;
  --header-color: #f2f2e4;
  --header-size:  1.5rem;
  --body-color:   #c5c5c5;
  --body-size:    1rem;

  /* placeholder values — edit these */
  --h2-color: #ececec;
  --h3-color: #edf1f4;

  --nav-overlay-bg: var(--night);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  background: #252527;
  font-family: var(--body-font);
  font-size: var(--body-size);
  color: var(--body-color);
}

h2 {
  font-family: var(--header-font);
  margin: 0 0 0.5em;
}

h3{
  font-family: var(--body-font);
  margin: 0 0 0.5em;
}

h2 { color: var(--h2-color); font-size: 20rem; font-weight: 400;}
h3 { color: var(--h3-color); font-size: 1.5rem; }

/* ── nav ──────────────────────────────────────────────────────────── */
.nav {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem 7rem;
  background: linear-gradient(
    to bottom,
    rgba(37, 37, 39, 0.9) 0%,
    rgba(37, 37, 39, 0.75) 25%,
    rgba(37, 37, 39, 0.45) 50%,
    rgba(37, 37, 39, 0.18) 75%,
    rgba(37, 37, 39, 0) 100%
  );
  pointer-events: none;
  transform: translateY(0);
  transition: transform 0.35s ease;
}

.nav.nav--hidden {
  transform: translateY(-100%);
}

.nav > * {
  pointer-events: auto;
}

.nav__name {
  font-family: var(--body-font);
  font-size: 1rem;
  color: var(--header-color);
  text-decoration: none;
  letter-spacing: 0.02em;
}

.nav__menu {
  display: none;
}

.nav__link {
  font-family: var(--body-font);
  font-size: var(--body-size);
  color: var(--body-color);
  text-decoration: none;
}

.nav__link:hover,
.nav__link:focus-visible {
  color: var(--header-color);
}

/* hamburger button — mobile only */
.nav__toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 26px;
  height: 20px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
  z-index: 101;
}

.nav__toggle-bar {
  display: block;
  width: 100%;
  height: 9px;
  background: var(--header-color);
  transition: transform 0.2s ease, opacity 0.2s ease;
}

.nav__toggle.is-open .nav__toggle-bar:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav__toggle.is-open .nav__toggle-bar:nth-child(2) { opacity: 0; }
.nav__toggle.is-open .nav__toggle-bar:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* mobile menu overlay */
.nav__menu.is-open {
  display: flex;
  position: fixed;
  inset: 0;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2rem;
  background: var(--nav-overlay-bg);
  z-index: 100;
}

.nav__menu.is-open .nav__link {
  font-size: 1.5rem;
}

body.nav-open {
  overflow: hidden;
}

/* ── the sky ──────────────────────────────────────────────────────── */

.sky {
  position: relative;
  width: 100%;
  height: 100svh;
  overflow: hidden;
  background: var(--night);
}

.sky__layer {
  position: absolute;
  inset: 0;
  margin: 0;
  padding: 0;
  font: 400 11px/1.15 var(--font-mono);
  letter-spacing: 0;
  white-space: pre;
  user-select: none;
  pointer-events: none;
}
.sky__layer--dim    { color: var(--dim); }
.sky__layer--bright { color: var(--bright); }
.sky__layer--moon   { color: var(--moon); }
.sky__layer--streak { color: var(--streak); }

/* ── hero text ────────────────────────────────────────────────────── */
.sky__hero {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
  padding: 0.5em 0.75em;
  max-width: 90vw;
  font: 400 var(--header-size)/1.3 var(--header-font);
  color: var(--header-color);
  text-align: center;
  white-space: normal;
}

/* ── scroll prompt ────────────────────────────────────────────────── */
.sky__scroll {
  position: absolute;
  left: 50%;
  bottom: 2%;
  transform: translateX(-50%);
  margin: 0;
  padding: 0.5em 0.75em;
  max-width: 90vw;
  font-family: var(--body-font);
  font-size: var(--body-size);
  color: var(--body-color);
  text-align: center;
  white-space: normal;
}

.sky__scroll-arrow {
  display: block;
  margin-top: 0.25em;
  font-size: 1.1em;
  animation: scroll-arrow-bounce 2.4s ease-in-out infinite;
}

@keyframes scroll-arrow-bounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(0.25em);
  }
}

/* ── projects ─────────────────────────────────────────────────────── */
.projects {
  padding: 4rem 1.5rem;
  scroll-margin-top: 6rem;
}

.projects__title {
  max-width: 1100px;
  margin: 0 auto 3rem;
  font-family: var(--header-font);
  font-weight: 400;
  font-size: 2.5rem;
}

.project {
  max-width: 1100px;
  margin: 0 auto;
}

.project + .project {
  margin-top: 5rem;
}

.project__link {
  display: block;
  color: inherit;
  text-decoration: none;
  cursor: pointer;
}

.project__link:hover .project__eyebrow,
.project__link:focus-visible .project__eyebrow {
  color: var(--header-color);
}

.project__link:hover .project__desc,
.project__link:focus-visible .project__desc {
  color: var(--header-color);
}

.project__eyebrow {
  margin: 0 0 0.75em;
  font-family: var(--body-font);
  font-size: 0.9rem;
  color: var(--body-color);
  opacity: 0.7;
  transition: color 0.2s ease;
}

.project__eyebrow span[aria-hidden="true"] {
  font-size: 0.7em;
  margin: 0 0.35em;
}

.project__desc {
  margin: 0 0 2rem;
  max-width: 46em;
  font-family: var(--body-font);
  font-weight: 400;
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--body-color);
  transition: color 0.2s ease;
}

.project__desc strong {
  font-weight: 700;
}

.project__cite {
  color: inherit;
  text-decoration: none;
  border-bottom: 1px solid currentColor;
}

.project__showcase {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  cursor: none;
}

.project__image {
  display: block;
  width: 100%;
  height: auto;
  min-width: 0;
  border-radius: 1rem;
}

.project__tooltip {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0.7em 1.3em;
  border-radius: 999px;
  background: rgba(37, 37, 39, 0.35);
  backdrop-filter: blur(14px) saturate(160%);
  -webkit-backdrop-filter: blur(14px) saturate(160%);
  border: 1px solid rgba(255, 255, 255, 0.4);
  box-shadow:
    0 4px 24px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.25);
  color: #fff;
  font-family: var(--body-font);
  font-size: 0.85rem;
  font-weight: 500;
  white-space: nowrap;
  pointer-events: none;
  opacity: 0;
  overflow: hidden;
  transform: translate(1.25rem, -50%) scale(0.9);
  transition: opacity 0.15s ease, transform 0.15s ease;
}

.project__tooltip.is-visible {
  opacity: 1;
  transform: translate(1.25rem, -50%) scale(1);
}

/* ── about ────────────────────────────────────────────────────────── */
.about {
  max-width: 640px;
  margin: 0 auto;
  padding: 9rem 1.5rem 4rem;
}

.about__title {
  font-family: var(--header-font);
  font-weight: 400;
  margin: 0 0 2.5rem;
}

.about__text {
  margin: 0 0 1.75rem;
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--body-color);
}

.about__placeholder {
  margin: 0;
  opacity: 0.6;
  font-style: italic;
}

/* ── photo stack ──────────────────────────────────────────────────── */
.photo-stack {
  position: relative;
  width: min(100%, 340px);
  aspect-ratio: 790 / 956;
  margin: 3.5rem auto 0;
  touch-action: pan-y;
}

.photo-stack__card {
  position: absolute;
  inset: 0;
  cursor: grab;
  transform: rotate(var(--rest-rot, 0deg)) translate(var(--stack-x, 0), var(--stack-y, 0)) scale(var(--stack-scale, 1));
  transform-origin: center center;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1), box-shadow 0.3s ease;
  will-change: transform;
}

.photo-stack__card img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 0.15rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.45);
  pointer-events: none;
  user-select: none;
  -webkit-user-drag: none;
}

.photo-stack__card.is-dragging {
  cursor: grabbing;
}

.photo-stack__card.is-dragging img,
.photo-stack__card.is-leaving img {
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.55);
}

.photo-stack__caption {
  margin: 4rem 0 0;
  text-align: center;
  font-family: var(--body-font);
  font-size: 0.9rem;
  color: var(--body-color);
  min-height: 1.3em;
  transition: opacity 0.2s ease;
}

/* ── site footer ──────────────────────────────────────────────────── */
.site-footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 2rem 1.5rem;
  border-top: 1px solid rgba(242, 242, 228, 0.15);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  flex-wrap: wrap;
}

.site-footer__copyright {
  margin: 0;
  font-family: var(--body-font);
  font-size: 0.85rem;
  color: var(--body-color);
  opacity: 0.6;
}

.site-footer__heart {
  font-size: 0.95em;
}

.site-footer__links {
  display: flex;
  gap: 1.5rem;
}

.site-footer__link {
  font-family: var(--body-font);
  font-size: 0.9rem;
  color: var(--body-color);
  text-decoration: none;
}

.site-footer__link:hover {
  color: var(--header-color);
}

/* ── breakpoint: tablet ───────────────────────────────────────────── */
@media (min-width: 768px) {
  :root {
    /* placeholder values — edit these */
    --header-size: 1.75rem;
    --body-size:   1.0625rem;
  }

  .nav__toggle {
    display: none;
  }

  .nav__menu {
    display: flex;
    position: static;
    gap: 2rem;
    background: none;
  }

  .sky__layer {
    font-size: 13px;
  }

  .sky__hero {
    max-width: 70vw;
    padding: 0.6em 1em;
    line-height: 1.25;
  }

  .project__showcase {
    flex-direction: row;
    align-items: flex-start;
  }

  .project__image {
    flex: 1 1 0;
    width: 50%;
    min-width: 0;
  }
}

/* ── breakpoint: desktop ──────────────────────────────────────────── */
@media (min-width: 1024px) {
  :root {
    /* placeholder values — edit these */
    --header-size: 2rem;
    --body-size:   1.125rem;
  }

  .sky__layer {
    font-size: 15px;
  }

  .sky__hero {
    max-width: 60vw;
    padding: 0.6em 1em;
    line-height: 1.2;
  }
}

/* ── case study ───────────────────────────────────────────────────── */

.cs-hero {
  max-width: 1100px;
  margin: 0 auto;
  padding: 1.5rem 1.5rem 3rem;
}

.cs-hero__eyebrow {
  margin: 0 0 1.25rem;
  font-family: var(--body-font);
  font-size: 0.9rem;
  color: var(--body-color);
  opacity: 0.7;
}

.cs-hero__title {
  margin: 0 0 0.75rem;
  font-family: var(--header-font);
  font-weight: 400;
  font-size: 2.25rem;
  color: var(--header-color);
}

.cs-hero__subtitle {
  margin: 0 0 2.5rem;
  max-width: 46em;
  font-family: var(--body-font);
  font-size: 1.25rem;
  line-height: 1.5;
  color: var(--body-color);
}

.cs-hero__meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem 2rem;
  margin: 0 0 2.5rem;
  padding: 1.5rem 0;
  border-top: 1px solid rgba(242, 242, 228, 0.15);
  border-bottom: 1px solid rgba(242, 242, 228, 0.15);
}

.cs-hero__meta dt {
  margin: 0 0 0.35em;
  font-family: var(--body-font);
  font-size: 0.8rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--body-color);
  opacity: 0.6;
}

.cs-hero__meta dd {
  margin: 0;
  font-family: var(--body-font);
  font-size: 1rem;
  color: var(--header-color);
}

.cs-hero__image-wrap {
  position: relative;
  left: 50%;
  width: 100vw;
  height: 90vh;
  margin-left: -50vw;
  margin-top: 0;
  margin-bottom: 2rem;
  overflow: hidden;
}

.cs-hero__image {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.cs-hero__video {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: min(60%, 680px);
  max-height: 70%;
  height: auto;
  display: block;
  border-radius: 1rem;
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.35);
}

@media (min-width: 768px) {
  .cs-hero__video {
    border-radius: 1.25rem;
  }
}

/* layout: sidebar + content */
.cs-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1.5rem 6rem;
}

.cs-nav {
  display: none;
}

.cs-nav__link {
  flex: 0 0 auto;
  font-family: var(--body-font);
  font-size: 0.85rem;
  white-space: nowrap;
  color: var(--body-color);
  opacity: 0.55;
  text-decoration: none;
  transition: opacity 0.2s ease, color 0.2s ease;
}

.cs-nav__link:hover,
.cs-nav__link:focus-visible {
  opacity: 1;
}

.cs-nav__link.is-active {
  color: var(--h3-color);
  opacity: 1;
}

.cs-content {
  display: flex;
  flex-direction: column;
  gap: 4rem;
  min-width: 0;
}

.cs-section {
  scroll-margin-top: 6rem;
  max-width: 640px;
}

.cs-section h2 {
  font-size: 2rem;
}

.cs-section h3 {
  font-size: 1.15rem;
  margin-top: 2rem;
}

.cs-section p {
  margin: 0 0 1.15em;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--body-color);
}

.cs-section ul {
  margin: 0 0 1.15em;
  padding-left: 1.25em;
  color: var(--body-color);
  line-height: 1.7;
}

.cs-section li {
  margin-bottom: 0.4em;
}

.cs-section li strong {
  color: var(--header-color);
}

.cs-quote {
  margin: 1.75rem 0;
  padding: 0.25rem 0 0.25rem 1.25rem;
  border-left: 2px solid var(--h3-color);
}

.cs-quote p {
  margin: 0;
  font-family: var(--header-font);
  font-style: italic;
  font-size: 1.15rem;
  line-height: 1.5;
  color: var(--header-color);
}

.cs-quote cite {
  display: block;
  margin-top: 0.6em;
  font-family: var(--body-font);
  font-style: normal;
  font-size: 0.85rem;
  color: var(--body-color);
  opacity: 0.6;
}

.cs-stats {
  display: flex;
  gap: 2.5rem;
  margin: 1.5rem 0;
}

.cs-stat__value {
  font-family: var(--header-font);
  font-weight: 700;
  font-size: 2.5rem;
  color: var(--body-color);
  line-height: 1;
}

.cs-stat__label {
  margin-top: 0.5em;
  font-family: var(--body-font);
  font-size: 0.85rem;
  color: var(--body-color);
  opacity: 0.7;
}

.cs-figure {
  margin: 1.75rem 0;
  max-width: 640px;
}

.cs-figure__image {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 1rem;
}

.cs-figure figcaption {
  margin-top: 0.75em;
  font-family: var(--body-font);
  font-size: 0.85rem;
  color: var(--body-color);
  opacity: 0.6;
}

.cs-footer {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem 6rem;
  border-top: 1px solid rgba(242, 242, 228, 0.15);
}

.cs-footer__back {
  display: inline-block;
  margin-bottom: 2rem;
  color: var(--body-color);
  text-decoration: none;
}

.cs-footer__back:hover {
  color: var(--header-color);
}

.cs-footer__next {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  color: inherit;
  text-decoration: none;
}

.cs-footer__next-image {
  width: 100%;
  max-width: 340px;
  height: auto;
  border-radius: 0.75rem;
  object-fit: cover;
}

.cs-footer__next-info {
  display: block;
}

.cs-footer__next-label {
  display: block;
  margin: 0 0 0.5em;
  font-family: var(--body-font);
  font-size: 1.1rem;
  color: var(--body-color);
  opacity: 0.6;
}

.cs-footer__next-title {
  display: block;
  font-family: var(--header-font);
  font-size: 2.5rem;
  color: var(--header-color);
}

.cs-footer__next:hover .cs-footer__next-title {
  color: var(--h3-color);
}

@media (min-width: 768px) {
  .cs-hero__title {
    font-size: 2.75rem;
  }

  .cs-hero__meta {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .cs-body {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 4rem;
  }

  .cs-nav {
    position: sticky;
    top: 7rem;
    z-index: 1;
    display: flex;
    flex-direction: column;
    gap: 0.85rem;
    align-self: start;
    margin-left: -2rem;
  }

  .cs-nav__link {
    position: relative;
    padding-left: 1.35rem;
  }

  .cs-nav__link::before {
    content: '\2726';
    position: absolute;
    left: 0;
    top: -0.05rem;
    font-size: 1.2rem;
    line-height: 1;
    color: var(--h3-color);
    opacity: 0;
    transition: opacity 0.2s ease;
  }

  .cs-nav__link.is-active::before {
    opacity: 1;
  }
}