/* =========================================================
   Page
   ========================================================= */

html,
body {
  margin: 0;
  padding: 0;
  background: #fff;
}


/* =========================================================
   Open Research Profile
   ========================================================= */

.orp {
  --ink: #111827;
  --muted: #6b7280;

  --surface: #f3f4f6;
  --surface-2: #e5e7eb;
  --line: #d1d5db;

  --accent: #2563eb;

  --used: #3b82f6;
  --aware: #6d7a96;
  --unaware: #9ca3af;
  --na: #d7dde8;

  --page: #fff;

  --option-bg: #fff;
  --option-ink: #424242;
  --option-border: transparent;

  --button-dark-bg: #111827;
  --button-dark-ink: #fff;

  --validation: #a63211;

  color: var(--ink);
  background: var(--page);

  font: 400 1rem/1.55 ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;

  max-width: 68rem;
  margin: 0 auto;
  padding: 2rem 0 5rem;
}


/* =========================================================
   Base
   ========================================================= */

.orp * {
  box-sizing: border-box;
}

.orp h1,
.orp h2,
.orp h3,
.orp p {
  margin-top: 0;
}

.orp h1,
.orp h2 {
  letter-spacing: -.045em;
  line-height: 1.05;
}

.orp h1 {
  font-size: clamp(3rem, 8vw, 4rem);
  max-width: 70rem;
  margin-bottom: 1.4rem;
}

.orp h2 {
  font-size: clamp(3rem, 8vw, 3rem);
  max-width: 60rem;
  margin-bottom: .9rem;
}

.orp h3 {
  font-size: 1rem;
  margin-bottom: .35rem;
}


/* =========================================================
   Homepage link
   ========================================================= */

.orp-home {
  position: absolute;
  top: 2rem;
  left: 2rem;
  z-index: 30;

  color: #111827;

  font: 700 1.15rem/1 ui-sans-serif, system-ui, -apple-system,
    BlinkMacSystemFont, "Segoe UI", sans-serif;

  letter-spacing: -.025em;
  text-decoration: none;

  transition:
    opacity .15s,
    transform .15s;
}

.orp-home:hover {
  opacity: .7;
  transform: translateY(-1px);
}

.orp-home:focus-visible {
  outline: 2px solid #2563eb;
  outline-offset: .35rem;
  border-radius: 2px;
}


/* =========================================================
   Intro
   ========================================================= */

.orp__intro {
  padding: clamp(2rem, 6vw, 5rem) 0 4rem;
}

.orp__eyebrow,
.orp__label {
  font-size: .74rem;
  font-weight: 750;
  letter-spacing: .12em;
  text-transform: uppercase;
}

.orp__eyebrow {
  color: var(--accent);
  margin-bottom: 1.1rem;
}

.orp__lead {
  font-size: clamp(1.12rem, 2vw, 1.45rem);
  line-height: 1.45;
  max-width: 55rem;
}


/* =========================================================
   Privacy notice
   ========================================================= */

.orp__privacy {
  border-top: 1px solid var(--ink);
  border-bottom: 1px solid var(--ink);

  display: flex;
  gap: 1rem;
  align-items: flex-start;

  max-width: 50rem;
  margin: 2.4rem 0 1.3rem;
  padding: 1rem 0;
}

.orp__privacy span {
  color: var(--accent);

  font-size: 1.2rem;
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -.12em;
}

.orp__privacy p {
  margin: 0;
}

.orp__meta {
  color: var(--muted);

  display: flex;
  gap: .55rem;
  flex-wrap: wrap;

  font-size: .9rem;

  margin-bottom: 2.2rem;
}


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

.orp__button {
  background: var(--accent);
  border: 1px solid var(--accent);
  border-radius: 999px;

  color: #fff;
  cursor: pointer;

  display: inline-flex;
  gap: .9rem;
  align-items: center;

  font: 700 .93rem/1 ui-sans-serif, system-ui, sans-serif;

  padding: 1rem 1.4rem;
  text-decoration: none;

  transition:
    transform .15s,
    background .15s,
    border-color .15s;
}

.orp__button:hover {
  transform: translateY(-2px);
  background: #1d4ed8;
  border-color: #1d4ed8;
}

.orp__button:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.orp__button--dark {
  background: var(--button-dark-bg);
  border-color: var(--button-dark-bg);
  color: var(--button-dark-ink);

  margin-top: 2rem;
}

.orp__button--dark:hover {
  background: #1f2937;
  border-color: #1f2937;
}


/* =========================================================
   Section headings
   ========================================================= */

.orp__section-heading {
  border-top: 1px solid var(--line);
  padding-top: 3rem;
  margin-bottom: 1.6rem;
}

.orp__section-heading > p:last-child {
  color: var(--muted);
  max-width: 43rem;
}


/* =========================================================
   Progress
   ========================================================= */

.orp__progress {
  position: sticky;
  top: 0;
  z-index: 20;

  display: flex;
  gap: 1rem;
  align-items: center;

  background: var(--page);
  border-bottom: 1px solid var(--line);
  color: var(--muted);

  font-size: .85rem;

  margin: 1.2rem 0 1.8rem;
  padding: 1rem 0;

  box-shadow: 0 5px 9px rgba(17, 24, 39, .05);
}

.orp__progress > span {
  flex: 0 0 auto;
}

.orp__progress > div {
  background: var(--surface-2);
  height: 4px;
  flex: 1;
}

.orp__progress i {
  display: block;

  background: var(--accent);

  height: 100%;
  width: 0;

  transition: width .2s;
}


/* =========================================================
   Cards
   ========================================================= */

.orp__cards {
  display: grid;
  gap: 1px;

  background: var(--line);
  border: 1px solid var(--line);
}

.orp__card {
  background: var(--surface);
  padding: 1.35rem;
}

.orp__card-header {
  display: flex;
  gap: 1rem;
  justify-content: space-between;
  align-items: baseline;
}

.orp__card h3 {
  font-size: 1.12rem;
  margin: 0;
}

.orp__number {
  font-size: .78rem;
  color: var(--muted);
}

.orp__definition {
  color: var(--muted);

  font-size: .91rem;
  line-height: 1.45;

  max-width: 50rem;
  margin: .35rem 0 1rem;
}


/* =========================================================
   Response options
   ========================================================= */

.orp__options {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: .45rem;
}

.orp__option input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.orp__option span {
  border: 1px solid var(--option-border);
  cursor: pointer;

  display: flex;
  align-items: center;

  min-height: 3rem;
  padding: .45rem .55rem;

  background: var(--option-bg);
  color: var(--option-ink);

  font-size: .8rem;
  line-height: 1.25;

  transition:
    border-color .15s,
    background .15s,
    color .15s;
}

.orp__option span::before {
  content: "";

  width: .65rem;
  height: .65rem;

  border: 1px solid currentColor;
  border-radius: 50%;

  margin-right: .45rem;
  flex: none;
}

/* Light-mode hover */

.orp__option span:hover {
  background: #f3f4f6;
  border-color: var(--line);
}

.orp__option input:focus-visible + span {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.orp__option input:checked + span {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--page);
}

.orp__option input:checked + span::before {
  background: var(--accent);
  border-color: var(--accent);
}

.orp__validation {
  color: var(--validation);
  margin: 1.4rem 0 0;
}


/* =========================================================
   Results
   ========================================================= */

.orp__results {
  scroll-margin-top: 2rem;
  margin-top: 5rem;
}

.orp__benchmark {
  display: flex;
  justify-content: space-between;
  gap: 2rem;
  align-items: end;

  margin: 2rem 0 1rem;
}

.orp__label {
  margin-bottom: .6rem;
}


/* =========================================================
   Tabs
   ========================================================= */

.orp__tabs {
  display: flex;
  gap: .45rem;
  flex-wrap: wrap;
}

.orp__tab {
  background: transparent;
  border: 1px solid var(--line);
  border-radius: 999px;

  color: var(--ink);
  cursor: pointer;

  font: 650 .82rem/1 ui-sans-serif, system-ui, sans-serif;

  padding: .65rem .85rem;
}

.orp__tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--page);
}

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

.orp__sample {
  color: var(--muted);

  font-size: .85rem;

  margin: 0;

  text-align: right;
  max-width: 17rem;
}


/* =========================================================
   Legend
   ========================================================= */

.orp__legend {
  display: flex;
  gap: 1rem;
  flex-wrap: wrap;

  font-size: .78rem;

  margin: 1.5rem 0 .8rem;
}

.orp__legend span {
  display: flex;
  align-items: center;
  gap: .32rem;
}

.orp__swatch {
  height: .7rem;
  width: .7rem;

  display: inline-block;
}

.orp__swatch--used {
  background: var(--used);
}

.orp__swatch--aware {
  background: var(--aware);
}

.orp__swatch--unaware {
  background: var(--unaware);
}

.orp__swatch--na {
  background: var(--na);
}


/* =========================================================
   Chart
   ========================================================= */

.orp__chart {
  border-top: 1px solid var(--ink);
}

.orp__row {
  display: grid;

  grid-template-columns:
    minmax(8rem, 1.1fr)
    minmax(10rem, 3fr)
    minmax(7rem, 1fr);

  gap: 1rem;
  align-items: center;

  border-bottom: 1px solid var(--line);

  padding: 1rem 0;
}

.orp__practice {
  font-weight: 700;
  font-size: .91rem;
}

.orp__bar {
  height: 1.45rem;

  display: flex;

  background: var(--surface-2);

  position: relative;
  overflow: hidden;
}

.orp__bar i {
  display: block;
  height: 100%;
  min-width: 1px;
}

.orp__bar .used {
  background: var(--used);
}

.orp__bar .aware {
  background: var(--aware);
}

.orp__bar .unaware {
  background: var(--unaware);
}

.orp__bar .na {
  background: var(--na);
}


/* =========================================================
   Response indicator
   ========================================================= */

.orp__response {
  font-size: .78rem;
  font-weight: 700;
  line-height: 1.2;

  text-align: right;
  text-transform: uppercase;

  letter-spacing: .04em;
}

.orp__response::before {
  content: "";

  display: inline-block;

  width: .55rem;
  height: .55rem;

  border-radius: 50%;

  margin-right: .35rem;

  background: var(--ink);
}

.orp__response[data-response="used"]::before {
  background: var(--used);
}

.orp__response[data-response="aware"]::before {
  background: var(--aware);
}

.orp__response[data-response="unaware"]::before {
  background: var(--unaware);
}

.orp__response[data-response="na"]::before {
  background: var(--na);
  border: 1px solid var(--muted);
}

.orp__chart-note {
  color: var(--muted);
  font-size: .79rem;
  margin-top: .9rem;
}


/* =========================================================
   Caveat
   ========================================================= */

.orp__caveat {
  border-left: 3px solid var(--accent);

  margin: 2.8rem 0 1.8rem;
  padding: .2rem 0 .2rem 1.1rem;

  max-width: 55rem;
}

.orp__caveat p {
  color: var(--muted);
  font-size: .9rem;
  margin: 0;
}


/* =========================================================
   Actions
   ========================================================= */

.orp__actions {
  display: flex;
  gap: 1.4rem;
}

.orp__text-button {
  background: none;

  border: 0;
  border-bottom: 1px solid var(--ink);

  color: var(--ink);
  cursor: pointer;

  font: 650 .88rem/1.5 ui-sans-serif, system-ui, sans-serif;

  padding: 0;
}


/* =========================================================
   Sources
   ========================================================= */

.orp__sources {
  border-top: 1px solid var(--line);

  color: var(--muted);

  font-size: .8rem;
  line-height: 1.55;

  margin-top: 3rem;
  padding-top: 1.5rem;
}

.orp__sources h3 {
  color: var(--ink);
  font-size: .9rem;
}

.orp__sources p {
  max-width: 70vw;
}


/* =========================================================
   Links
   ========================================================= */

.orp a:not(.orp__button) {
  color: inherit;
  text-decoration-color: var(--accent);
  text-underline-offset: .18em;
}


/* =========================================================
   Dark mode
   ========================================================= */

@media (prefers-color-scheme: dark) {

  html,
  body {
    background: #1e293b;
  }


  /* -------------------------
     Colour system
     ------------------------- */

  .orp {
    color-scheme: dark;

    --ink: #e2e8f0;
    --muted: #a8b1c0;

    --page: #1e293b;

    --surface: #182131;
    --surface-2: #2b384c;
    --line: #3b4a60;

    --accent: #60a5fa;

    --used: #3b82f6;
    --aware: #8390aa;
    --unaware: #6b7280;
    --na: #4b586c;

    --option-bg: #182131;
    --option-ink: #d5dbe5;
    --option-border: #3b4658;

    --button-dark-bg: #e2e8f0;
    --button-dark-ink: #1e293b;

    --validation: #fb923c;
  }


  /* -------------------------
     Homepage link
     ------------------------- */

  .orp-home {
    color: #f1f5f9;
  }


  /* -------------------------
     Progress
     ------------------------- */

  .orp__progress {
    background: var(--page);
    box-shadow: none;
    border-bottom-color: var(--line);
  }

  .orp__progress > div {
    background: var(--surface-2);
  }


  /* -------------------------
     Primary button
     ------------------------- */

  .orp__button {
    color: #0d1117;
  }

  .orp__button:hover {
    background: #93c5fd;
    border-color: #93c5fd;
  }


  /* -------------------------
     Show-profile button
     ------------------------- */

  .orp__button--dark {
    background: var(--button-dark-bg);
    border-color: var(--button-dark-bg);
    color: var(--button-dark-ink);
  }

  .orp__button--dark:hover {
    background: #d1d5db;
    border-color: #d1d5db;
  }


  /* -------------------------
     Response options
     ------------------------- */

  .orp__option span:hover {
    background: #4a5f7e;
    border-color: #4b5563;
  }

  .orp__option input:checked + span {
    background: #334155;
    border-color: var(--accent);
    color: #f1f5f9;
  }

  .orp__option input:checked + span::before {
    background: var(--accent);
    border-color: var(--accent);
  }


  /* -------------------------
     Tabs
     ------------------------- */

  .orp__tab[aria-selected="true"] {
    background: var(--ink);
    border-color: var(--ink);
    color: #111827;
  }


  /* -------------------------
     Response indicator
     ------------------------- */

  .orp__response::before {
    background: var(--ink);
  }
}


/* =========================================================
   Mobile
   ========================================================= */

@media (max-width: 640px) {

  /* Page gutter */
  .orp {
    padding: 1rem 1.25rem 3rem;
  }

  /* Keep homepage link aligned with page content */
  .orp-home {
    top: 1.25rem;
    left: 1.25rem;
    font-size: 1rem;
  }

  /* Intro */
  .orp__intro {
    padding-top: 2rem;
  }

  /* On small screens, use the available width rather than
     retaining the intentionally wide desktop measures */
  .orp h1,
  .orp h2,
  .orp__lead,
  .orp__section-heading > p:last-child,
  .orp__sources p {
    max-width: none;
    width: 100%;
  }

  /* Large headings remain prominent without overwhelming
     the available mobile width */
  .orp h1,
  .orp h2 {
    font-size: clamp(2.35rem, 11vw, 3rem);
  }

  /* Questionnaire options: two columns instead of four */
  .orp__options {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  /* Results benchmark */
  .orp__benchmark {
    display: block;
  }

  .orp__sample {
    text-align: left;
    margin-top: 1rem;
  }

  /* Results chart:
     practice + response on first row,
     full-width bar underneath */
  .orp__row {
    grid-template-columns: 1fr 5.5rem;
    gap: .45rem;
  }

  .orp__bar {
    grid-column: 1 / -1;
    grid-row: 2;
  }

  .orp__response {
    grid-column: 2;
    grid-row: 1;
  }

  /* Privacy notice */
  .orp__privacy {
    margin-top: 1.8rem;
  }
}