:root {
  --bg: #f4f1e8;
  --accent: #9b4819;
  --text: #191919;

  --paper: #fffaf0;
  --paper-dark: #eadac4;

  --green: #6c7f54;
  --red: #a9584b;

  --muted: #6e675f;

  --serif: "Radley", Georgia, serif;
  --sans: "Carlito", Arial, sans-serif;

  --page-pad: clamp(24px, 5vw, 80px);
}


/* ==================================
   RESET
================================== */

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

html {
  background: var(--bg);
}

body {
  margin: 0;

  background:
    radial-gradient(
      circle at 50% 0,
      rgba(255,255,255,.65),
      transparent 35%
    ),
    var(--bg);

  color: var(--text);

  font-family: var(--sans);

  overflow-x: hidden;
}

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

a {
  color: inherit;
}


/* ==================================
   HEADER
================================== */

.site-header {
  position: fixed;

  top: 0;
  left: 0;

  z-index: 100;

  width: 100%;

  display: flex;
  justify-content: space-between;
  align-items: center;

  padding:
    24px
    var(--page-pad);

  background:
    linear-gradient(
      to bottom,
      rgba(244,241,232,.96),
      rgba(244,241,232,0)
    );
}

.logo {
  text-decoration: none;

  font-size: .82rem;

  font-weight: 700;

  letter-spacing: .09em;
}

.main-nav {
  display: flex;

  gap:
    clamp(
      16px,
      2vw,
      32px
    );
}

.main-nav a {
  position: relative;

  text-decoration: none;

  font-size: .88rem;
}

.main-nav a::after {
  content: "";

  position: absolute;

  left: 0;
  bottom: -5px;

  width: 100%;
  height: 1px;

  background: var(--accent);

  transform: scaleX(0);

  transform-origin: right;

  transition:
    transform
    .3s
    ease;
}

.main-nav a:hover::after,
.main-nav a.active::after {
  transform: scaleX(1);

  transform-origin: left;
}


/* ==================================
   GLOBAL
================================== */

main {
  padding-top: 100px;
}

.section-wrap {
  width:
    min(
      1200px,
      calc(100% - 2 * var(--page-pad))
    );

  margin:
    0 auto;
}

.paper-card {
  position: relative;

  background:
    linear-gradient(
      135deg,
      rgba(255,255,255,.5),
      transparent 60%
    ),
    var(--paper);

  border:
    1px solid
    rgba(
      70,
      48,
      29,
      .13
    );

  box-shadow:
    0
    12px
    28px
    rgba(
      73,
      46,
      27,
      .08
    );
}

.eyebrow {
  margin:
    0 0 8px;

  color:
    var(--accent);

  font-size:
    .72rem;

  font-weight:
    700;

  letter-spacing:
    .13em;
}

.section-label {
  display: flex;

  align-items: center;

  gap: 11px;

  width: fit-content;

  margin-bottom: 26px;

  color: var(--accent);
}

.section-label span {
  font-family: var(--serif);

  font-style: italic;

  font-size: 1rem;
}

.section-label p {
  margin: 0;

  font-size: .72rem;

  font-weight: 700;

  letter-spacing: .12em;
}


/* ==================================
   PAPER DECORATIONS
================================== */

.pinned::before {
  content: "";

  position: absolute;

  top: -5px;
  right: 24px;

  width: 10px;
  height: 10px;

  border-radius: 50%;

  background: #754523;

  box-shadow:
    0
    3px
    6px
    rgba(
      0,
      0,
      0,
      .2
    );
}

.tape {
  position: absolute;

  z-index: 5;

  width: 80px;
  height: 28px;

  background:
    rgba(
      224,
      197,
      153,
      .72
    );
}

.tape-one {
  left: -18px;
  top: -10px;

  transform:
    rotate(-13deg);
}

.tape-two {
  right: -17px;
  top: -9px;

  transform:
    rotate(12deg);
}

.taped::before {
  content: "";

  position: absolute;

  left: -14px;
  top: -10px;

  width: 70px;
  height: 25px;

  background:
    rgba(
      158,
      174,
      130,
      .75
    );

  transform:
    rotate(12deg);
}


/* ==================================
   HERO
================================== */

.hero-section {
  width:
    min(
      1320px,
      calc(100% - 2 * var(--page-pad))
    );

  margin:
    0 auto;
}

.back-link {
  display: inline-block;

  margin-bottom: 30px;

  color: var(--accent);

  text-decoration: none;
}

.hero-grid {
  display: grid;

  grid-template-columns:
    minmax(0,1.05fr)
    minmax(340px,.95fr);

  gap:
    clamp(
      45px,
      6vw,
      90px
    );

  align-items: center;
}

.hero-visual {
  padding: 18px;

  transform:
    rotate(-1deg);
}

.browser-comparison {
  display: grid;

  grid-template-columns:
    1fr
    1fr;

  gap: 13px;
}

.browser {
  overflow: hidden;

  background: white;

  border:
    1px solid
    rgba(
      25,
      25,
      25,
      .2
    );
}

.browser-top {
  display: flex;

  gap: 5px;

  padding: 7px;

  background: #e8e3dc;
}

.browser-top span {
  width: 6px;
  height: 6px;

  border-radius: 50%;

  background:
    rgba(
      25,
      25,
      25,
      .4
    );
}

.browser-label {
  padding: 7px;

  color: var(--accent);

  font-size: .67rem;

  font-weight: 700;

  text-align: center;
}

.browser img {
  width: 100%;

  aspect-ratio:
    4 / 3;

  object-fit: cover;
}

.hero-copy {
  display: flex;

  flex-direction: column;

  gap: 25px;
}

.hero-paper {
  padding:
    28px
    32px;

  transform:
    rotate(.7deg);
}

.hero-paper h1 {
  margin: 0;

  color: var(--accent);

  font-family: var(--serif);

  font-size:
    clamp(
      2.2rem,
      4vw,
      4.5rem
    );

  font-style: italic;

  font-weight: 400;

  line-height: 1;
}

.hero-description {
  margin: 0;

  line-height: 1.65;

  font-size: 1.05rem;
}

.tag-list {
  display: flex;

  flex-wrap: wrap;

  gap: 8px;
}

.tag-list span {
  padding:
    7px
    12px;

  border-radius:
    999px;

  background:
    #eadfce;

  font-size: .77rem;
}


/* ==================================
   RESEARCH
================================== */

.research-section {
  margin-top:
    100px;
}

.research-grid {
  display: grid;

  grid-template-columns:
    1fr
    1fr;

  gap:
    clamp(
      40px,
      7vw,
      100px
    );

  align-items: center;
}

.research-grid h2,
.built-copy h2,
.pilot-grid h2,
.journey-section > h2 {
  margin:
    0 0 20px;

  font-family: var(--serif);

  font-size:
    clamp(
      2.5rem,
      4.3vw,
      4.5rem
    );

  font-weight: 400;

  line-height: 1;
}

.research-grid p,
.built-copy p,
.pilot-grid p {
  line-height: 1.7;
}

.research-question {
  padding:
    38px;

  color: var(--accent);

  transform:
    rotate(1deg);
}

.research-question p {
  margin: 0;

  font-family: var(--serif);

  font-size:
    clamp(
      1.5rem,
      2.5vw,
      2.3rem
    );

  font-style: italic;

  line-height: 1.25;
}

.quote-mark {
  position: absolute;

  left: 15px;
  top: -25px;

  font-family: var(--serif);

  font-size: 7rem;

  opacity: .12;
}


/* ==================================
   BUILT
================================== */

.built-section {
  margin-top:
    100px;
}

.built-grid {
  display: grid;

  grid-template-columns:
    1fr
    .9fr;

  gap:
    clamp(
      50px,
      8vw,
      110px
    );

  align-items: center;
}

.feature-list {
  display: grid;

  grid-template-columns:
    1fr
    1fr;

  gap:
    12px;

  margin-top: 30px;
}

.feature-list div {
  display: flex;

  align-items: center;

  gap: 9px;
}

.feature-list span {
  color: var(--green);
}

.feature-list p {
  margin: 0;
}

.architecture-card {
  padding:
    35px;

  transform:
    rotate(-.8deg);
}

.card-caption {
  margin:
    0 0 25px;

  color: var(--accent);

  font-size: .7rem;

  font-weight: 700;

  letter-spacing: .12em;
}

.architecture {
  display: flex;

  flex-direction: column;

  align-items: center;

  gap: 11px;

  text-align: center;
}

.architecture > span:not(.arrow),
.architecture strong {
  width: 100%;

  padding:
    10px;

  border:
    1px solid
    rgba(
      25,
      25,
      25,
      .17
    );
}

.architecture strong {
  color: var(--accent);
}

.arrow {
  color: var(--accent);
}

.hosting-note {
  margin:
    25px 0 0;

  text-align: center;

  font-family: var(--serif);

  font-style: italic;

  color: var(--accent);
}


/* ==================================
   COMPARISON
================================== */

.comparison-section {
  margin-top:
    110px;

  padding:
    80px 0;

  background:
    linear-gradient(
      120deg,
      rgba(
        169,
        87,
        73,
        .1
      ),
      rgba(
        108,
        127,
        84,
        .1
      )
    );
}

.comparison-heading {
  max-width: 720px;

  margin-bottom:
    40px;
}

.comparison-heading h2,
.method-heading h2,
.results-heading h2 {
  margin:
    0 0 15px;

  font-family: var(--serif);

  font-size:
    clamp(
      2.7rem,
      4.5vw,
      4.7rem
    );

  font-weight: 400;
}

.comparison-heading p,
.method-heading p,
.results-heading p {
  line-height: 1.6;

  color: var(--muted);
}


/* IMAGE SLIDER */

.compare-slider {
  position: relative;

  width:
    min(
      100%,
      1050px
    );

  aspect-ratio:
    16 / 8;

  margin:
    0 auto;

  overflow: hidden;

  background: white;

  box-shadow:
    0
    18px
    35px
    rgba(
      62,
      45,
      32,
      .12
    );
}

.compare-image {
  position: absolute;

  inset: 0;
}

.compare-image img {
  width: 100%;
  height: 100%;

  object-fit: cover;
}

.compare-overlay {
  width: 50%;

  overflow: hidden;
}

.compare-overlay img {
  width:
    min(
      1050px,
      calc(100vw - 2 * var(--page-pad))
    );

  max-width: none;
}

.compare-label {
  position: absolute;

  top: 16px;

  z-index: 5;

  padding:
    6px
    10px;

  color: white;

  font-size: .7rem;

  font-weight: 700;
}

.label-a {
  right: 16px;

  background: var(--red);
}

.label-b {
  left: 16px;

  background: var(--green);
}

.compare-handle {
  position: absolute;

  left: 50%;
  top: 0;

  z-index: 8;

  width: 3px;
  height: 100%;

  background: white;

  transform:
    translateX(-50%);
}

.compare-handle::after {
  content: "";

  position: absolute;

  left: 50%;
  top: 50%;

  width: 55px;
  height: 55px;

  border-radius: 50%;

  background: var(--accent);

  transform:
    translate(-50%,-50%);
}

.compare-handle span {
  position: absolute;

  z-index: 2;

  top: 50%;

  color: white;

  transform:
    translateY(-50%);
}

.compare-handle span:first-child {
  left: -19px;
}

.compare-handle span:last-child {
  right: -19px;
}

#comparison-range {
  position: absolute;

  inset: 0;

  z-index: 10;

  width: 100%;
  height: 100%;

  opacity: 0;

  cursor: ew-resize;
}


/* Accessibility cards */

.accessibility-grid {
  display: grid;

  grid-template-columns:
    repeat(
      3,
      minmax(
        0,
        1fr
      )
    );

  gap: 18px;

  margin-top:
    45px;
}

.access-card {
  padding:
    25px;

  min-height:
    180px;
}

.access-number {
  color: var(--accent);

  font-family: var(--serif);

  font-style: italic;
}

.access-card h3 {
  margin:
    14px 0 8px;

  font-family: var(--serif);

  font-size: 1.35rem;

  font-weight: 400;
}

.access-card p {
  margin: 0;

  color: var(--muted);

  line-height: 1.5;
}


/* ==================================
   PILOT
================================== */

.pilot-section {
  margin-top:
    100px;
}

.pilot-grid {
  display: grid;

  grid-template-columns:
    .9fr
    1.1fr;

  gap:
    70px;

  align-items: center;
}

.iteration-board {
  display: grid;

  grid-template-columns:
    1fr
    auto
    1fr;

  gap:
    13px;

  align-items: center;
}

.iteration-item {
  padding:
    18px;

  background: var(--paper);

  border:
    1px solid
    rgba(
      25,
      25,
      25,
      .14
    );
}

.iteration-item span {
  display: block;

  margin-bottom:
    7px;

  color: var(--accent);

  font-size: .65rem;

  letter-spacing: .1em;
}

.iteration-item strong {
  font-size: .9rem;
}

.iteration-arrow {
  color: var(--accent);
}


/* ==================================
   METHOD
================================== */

.method-section {
  margin-top:
    110px;

  padding:
    80px 0;

  background:
    rgba(
      255,
      250,
      240,
      .55
    );
}

.method-heading {
  max-width: 650px;
}

.experiment-grid {
  display: grid;

  grid-template-columns:
    220px
    1fr
    1fr;

  margin-top:
    40px;

  border:
    1px solid
    rgba(
      25,
      25,
      25,
      .18
    );
}

.experiment-grid > div {
  padding:
    20px;

  border:
    1px solid
    rgba(
      25,
      25,
      25,
      .09
    );
}

.experiment-head {
  text-align: center;

  color: var(--accent);

  font-weight: 700;
}

.experiment-head.highlight {
  background:
    rgba(
      108,
      127,
      84,
      .12
    );
}

.experiment-side {
  font-weight: 700;
}

.experiment-cell {
  display: flex;

  flex-direction: column;

  align-items: center;

  text-align: center;
}

.experiment-cell strong {
  font-family: var(--serif);

  font-size: 2.2rem;

  color: var(--accent);
}

.highlight-cell {
  background:
    rgba(
      108,
      127,
      84,
      .08
    );
}

.participant-stat {
  display: flex;

  align-items: baseline;

  justify-content: center;

  gap: 13px;

  margin-top:
    35px;
}

.participant-stat strong {
  color: var(--accent);

  font-family: var(--serif);

  font-size:
    clamp(
      3rem,
      6vw,
      6rem
    );
}


/* ==================================
   JOURNEY
================================== */

.journey-section {
  margin-top:
    100px;
}

.journey {
  display: grid;

  grid-template-columns:
    1fr auto 1fr auto 1fr auto 1fr;

  gap:
    15px;

  align-items: center;

  margin-top:
    40px;
}

.journey-step {
  min-height:
    210px;

  padding:
    24px;

  background: var(--paper);

  border:
    1px solid
    rgba(
      25,
      25,
      25,
      .13
    );
}

.journey-number {
  color: var(--accent);

  font-family: var(--serif);

  font-style: italic;
}

.journey-step h3 {
  margin:
    16px 0 10px;

  font-family: var(--serif);

  font-size:
    1.45rem;

  font-weight: 400;
}

.journey-step p {
  margin: 0;

  color: var(--muted);

  line-height: 1.5;
}

.journey-arrow {
  color: var(--accent);

  font-size: 1.4rem;
}


/* ==================================
   DATA
================================== */

.data-section {
  margin-top:
    100px;
}

.data-grid {
  display: grid;

  grid-template-columns:
    repeat(
      3,
      1fr
    );

  gap:
    22px;
}

.data-card {
  padding:
    28px;

  min-height:
    220px;
}

.data-icon {
  color: var(--accent);

  font-size: 1.8rem;
}

.data-card h3 {
  margin:
    18px 0 10px;

  font-family: var(--serif);

  font-size: 1.5rem;

  font-weight: 400;
}

.data-card p {
  margin: 0;

  line-height: 1.6;

  color: var(--muted);
}


/* ==================================
   RESULTS
================================== */

.results-section {
  margin-top:
    110px;

  padding:
    90px 0;

  background:
    #eee3d3;
}

.results-heading {
  max-width: 700px;
}

.result-grid {
  display: grid;

  grid-template-columns:
    1.3fr
    1fr
    1fr;

  gap:
    22px;

  margin-top:
    40px;
}

.result-card {
  padding:
    28px;

  background: var(--paper);

  border:
    1px solid
    rgba(
      25,
      25,
      25,
      .12
    );
}

.result-main {
  background:
    linear-gradient(
      135deg,
      var(--paper),
      rgba(
        108,
        127,
        84,
        .12
      )
    );
}

.result-label {
  margin:
    0 0 24px;

  color: var(--accent);

  font-size: .68rem;

  font-weight: 700;

  letter-spacing: .1em;
}

.result-numbers {
  display: flex;

  align-items: center;

  justify-content:
    space-between;

  gap:
    20px;
}

.result-numbers > div {
  display: flex;

  flex-direction: column;

  gap: 6px;
}

.result-numbers strong {
  font-family: var(--serif);

  font-size:
    clamp(
      2.8rem,
      5vw,
      5rem
    );

  font-weight: 400;
}

.result-numbers .positive strong {
  color: var(--green);
}

.result-arrow {
  color: var(--accent);

  font-size: 1.5rem;
}

.result-card > p:not(.result-label) {
  line-height: 1.55;
}

.result-card small {
  color: var(--accent);
}

.compact strong {
  font-size:
    clamp(
      2.4rem,
      4vw,
      3.8rem
    );
}


/* ==================================
   INSIGHTS
================================== */

.insights-section {
  margin-top:
    100px;
}

.insights-grid {
  display: grid;

  grid-template-columns:
    1fr
    1fr;

  gap:
    25px;
}

.insight-card {
  padding:
    30px;

  border:
    1px solid
    rgba(
      25,
      25,
      25,
      .12
    );
}

.problem-card {
  background:
    rgba(
      169,
      88,
      75,
      .08
    );
}

.positive-card {
  background:
    rgba(
      108,
      127,
      84,
      .1
    );
}

.insight-top {
  color: var(--accent);

  font-size: .7rem;

  font-weight: 700;

  letter-spacing: .1em;
}

.insight-card h3 {
  font-family: var(--serif);

  font-size: 2rem;

  font-weight: 400;
}

.insight-card li {
  margin-bottom:
    10px;
}


/* ==================================
   LEARNING
================================== */

.learning-section {
  margin-top:
    100px;
}

.learning-card {
  width:
    min(
      850px,
      100%
    );

  margin:
    0 auto;

  padding:
    clamp(
      30px,
      5vw,
      60px
    );
}

.learning-card h2 {
  margin:
    0 0 20px;

  color: var(--accent);

  font-family: var(--serif);

  font-size:
    clamp(
      3rem,
      5vw,
      5rem
    );

  font-weight: 400;
}

.learning-card > p:not(.eyebrow) {
  max-width:
    65ch;

  line-height:
    1.7;
}

.learning-note {
  margin-top:
    30px;

  color: var(--accent);

  font-family: var(--serif);

  font-size:
    1.35rem;

  font-style: italic;

  transform:
    rotate(-1deg);
}


/* ==================================
   NEXT
================================== */

.next-project {
  width:
    min(
      650px,
      calc(100% - 2 * var(--page-pad))
    );

  margin:
    90px
    auto;
}

.next-project-link {
  display: grid;

  grid-template-columns:
    auto
    1fr
    auto;

  gap:
    20px;

  align-items: center;

  padding:
    25px 30px;

  background:
    #ead7ba;

  color: var(--accent);

  text-decoration: none;

  transition:
    transform
    .3s
    ease;
}

.next-project-link:hover {
  transform:
    translateY(-5px)
    rotate(-.5deg);
}

.next-project-link > span:first-child {
  font-size: .68rem;

  letter-spacing: .1em;
}

.next-project-link strong {
  font-family: var(--serif);

  font-size: 1.5rem;

  font-style: italic;

  font-weight: 400;
}

.next-arrow {
  font-size: 1.7rem;
}


/* ==================================
   FOOTER
================================== */

footer {
  padding:
    25px
    var(--page-pad);

  border-top:
    1px solid
    rgba(
      25,
      25,
      25,
      .12
    );

  font-size: .8rem;
}


/* ==================================
   REVEAL
================================== */

.reveal {
  opacity: 0;

  transform:
    translateY(25px);

  transition:
    opacity
    .75s
    ease,
    transform
    .75s
    ease;
}

.reveal.visible {
  opacity: 1;

  transform:
    translateY(0);
}


/* ==================================
   PAGE TRANSITION
================================== */

.page-transition {
  position: fixed;

  inset: 0;

  z-index: 9999;

  background: var(--accent);

  transform:
    translateY(100%);

  pointer-events: none;
}

.page-transition.entering {
  animation:
    coverPage
    .7s
    cubic-bezier(
      .76,
      0,
      .24,
      1
    )
    forwards;
}

@keyframes coverPage {

  to {
    transform:
      translateY(0);
  }

}


/* ==================================
   RESPONSIVE
================================== */

@media (max-width: 980px) {

  .hero-grid,
  .research-grid,
  .built-grid,
  .pilot-grid {
    grid-template-columns:
      1fr;
  }

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

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

  .result-main {
    grid-column:
      1 / -1;
  }

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

  .journey-arrow {
    transform:
      rotate(90deg);

    text-align: center;
  }

}


@media (max-width: 760px) {

  .main-nav a:not(.active) {
    display: none;
  }

  .browser-comparison,
  .data-grid,
  .insights-grid,
  .accessibility-grid,
  .result-grid {
    grid-template-columns:
      1fr;
  }

  .comparison-section,
  .results-section,
  .method-section {
    padding:
      60px 0;
  }

  .experiment-grid {
    grid-template-columns:
      120px
      1fr
      1fr;
  }

  .experiment-grid > div {
    padding:
      12px;
  }

  .result-main {
    grid-column:
      auto;
  }

}


@media (max-width: 520px) {

  main {
    padding-top:
      90px;
  }

  .hero-section,
  .section-wrap {
    width:
      calc(
        100% - 32px
      );
  }

  .hero-paper {
    padding:
      22px;
  }

  .research-question {
    padding:
      28px;
  }

  .feature-list {
    grid-template-columns:
      1fr;
  }

  .iteration-board {
    grid-template-columns:
      1fr;
  }

  .iteration-arrow {
    transform:
      rotate(90deg);

    text-align: center;
  }

  .experiment-grid {
    grid-template-columns:
      95px
      1fr
      1fr;

    font-size: .75rem;
  }

}


/* ==================================
   ACCESSIBILITY
================================== */

a:focus-visible,
input:focus-visible {
  outline:
    2px solid
    var(--accent);

  outline-offset:
    5px;
}

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    animation-duration:
      .01ms
      !important;

    animation-iteration-count:
      1
      !important;

    transition-duration:
      .01ms
      !important;
  }

  .reveal {
    opacity: 1;

    transform: none;
  }

}