:root {
  --color-ink: #1f2a44;
  --color-paper: #f5f1e8;
  --color-muted: rgba(31, 42, 68, 0.68);
  --color-line: rgba(31, 42, 68, 0.18);
  --color-paper-muted: rgba(245, 241, 232, 0.72);
  --color-paper-line: rgba(245, 241, 232, 0.18);
  --header-height: 88px;
  --page-padding: 5.7vw;
  --header-padding: 3.4vw;
  --content-width: 1480px;
  --body-copy-size: clamp(18px, 1.45vw, 23px);
  --color-error: #f0a17f;
  --duration-fast: 200ms;
  --duration-nav: 240ms;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: var(--header-height);
}

html.discrete-scrolling {
  scroll-snap-type: y mandatory;
}

body {
  margin: 0;
  background: var(--color-paper);
  color: var(--color-ink);
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  line-height: 1.5;
  text-rendering: optimizeLegibility;
}

main {
  padding-top: var(--header-height);
}

html.discrete-scrolling main > section {
  scroll-snap-align: start;
  scroll-snap-stop: always;
}

html.native-scrolling {
  scroll-behavior: smooth;
  scroll-snap-type: none;
}

html.native-scrolling main > section,
html.native-scrolling footer {
  scroll-snap-align: none;
  scroll-snap-stop: normal;
}

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

.skip-link {
  position: fixed;
  z-index: 100;
  top: 12px;
  left: 12px;
  padding: 10px 14px;
  background: var(--color-paper);
  color: var(--color-ink);
  transform: translateY(-160%);
}

.skip-link:focus {
  transform: translateY(0);
}

.site-header {
  position: fixed;
  z-index: 50;
  top: 0;
  width: 100%;
  height: var(--header-height);
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  padding: 0 var(--header-padding);
  border-bottom: 1px solid rgba(31, 42, 68, 0.1);
  background: rgba(245, 241, 232, 0.88);
  -webkit-backdrop-filter: blur(18px);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  width: max-content;
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.brand-logo {
  display: block;
  width: 63px;
  height: 63px;
  flex: 0 0 auto;
}

.logo-mark {
  background-color: currentColor;
  -webkit-mask: url("assets/protocol-r-logo.svg") center / contain no-repeat;
  mask: url("assets/protocol-r-logo.svg") center / contain no-repeat;
}

.site-header nav {
  display: flex;
  gap: clamp(24px, 2.2vw, 42px);
}

.site-header nav a,
.header-cta {
  position: relative;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.025em;
}

.site-header nav a::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: -7px;
  left: 0;
  height: 1px;
  background: var(--color-ink);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--duration-nav) ease;
}

.site-header nav a:hover::after,
.site-header nav a:focus-visible::after,
.site-header nav a.active::after {
  transform: scaleX(1);
  transform-origin: left;
}

.header-actions {
  justify-self: end;
  display: flex;
  align-items: center;
  gap: 12px;
}

.header-cta.active {
  text-decoration: underline;
  text-underline-offset: 7px;
}

.linkedin-button {
  display: inline-grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--color-ink);
  border-radius: 50%;
  padding: 0 0 2px;
  background: transparent;
  color: var(--color-ink);
  font-family: Arial, "Helvetica Neue", Helvetica, sans-serif;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.025em;
  line-height: 1;
  transition:
    background var(--duration-fast) ease,
    color var(--duration-fast) ease;
}

.linkedin-button:hover,
.linkedin-button:focus-visible {
  background: var(--color-ink);
  color: var(--color-paper);
}

.hero {
  min-height: calc(100svh - var(--header-height));
  display: grid;
  place-items: center;
  padding: clamp(24px, 4.5vh, 48px) var(--page-padding);
  overflow: hidden;
  border-bottom: 1px solid var(--color-line);
}

.hero-copy {
  width: min(100%, 1160px);
  padding: 0;
  text-align: center;
}

.hero h1 {
  margin: 0;
  font-size: clamp(62px, 7.8vw, 126px);
  font-weight: 700;
  letter-spacing: -0.075em;
  line-height: 0.92;
  white-space: nowrap;
}

.hero h1 em {
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
  letter-spacing: -0.01em;
  font-variant-ligatures: none;
  font-feature-settings: "liga" 0, "clig" 0;
}

.hero-intro {
  max-width: 900px;
  margin: clamp(34px, 5vh, 62px) auto 0;
  font-size: clamp(20px, 1.7vw, 28px);
  line-height: 1.28;
  letter-spacing: -0.025em;
}

.hero-statement {
  max-width: 940px;
  margin: clamp(14px, 2.2vh, 24px) auto 0;
  font-size: clamp(22px, 2vw, 34px);
  font-weight: 700;
  line-height: 1.22;
  letter-spacing: -0.03em;
}

.hero-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
  width: min(100%, 620px);
  margin: clamp(30px, 5vh, 58px) auto 0;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: space-between;
  min-width: 210px;
  padding: 17px 19px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 800;
  transition:
    transform var(--duration-fast) ease,
    background var(--duration-fast) ease,
    color var(--duration-fast) ease;
}

.button:hover,
.button:focus-visible {
  transform: translateY(-3px);
}

.primary-button {
  background: var(--color-ink);
  color: var(--color-paper);
}

.secondary-button {
  border-color: var(--color-ink);
  background: transparent;
}

.secondary-button:hover,
.secondary-button:focus-visible {
  background: var(--color-ink);
  color: var(--color-paper);
}

.story-screen {
  min-height: calc(100svh - var(--header-height));
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(56px, 9vw, 150px);
  align-items: center;
  padding: clamp(28px, 5vh, 60px) var(--page-padding);
  border-bottom: 1px solid var(--color-line);
}

.story-screen > * {
  width: 100%;
  max-width: calc(var(--content-width) / 2);
}

.section-heading h2 {
  max-width: 720px;
  margin: 0;
  font-size: clamp(52px, 6.5vw, 102px);
  font-weight: 700;
  letter-spacing: -0.065em;
  line-height: 0.94;
}

.section-copy p {
  max-width: 760px;
  margin: 0;
  font-size: var(--body-copy-size);
  letter-spacing: -0.02em;
  line-height: 1.3;
  text-align: justify;
  text-align-last: left;
  text-justify: inter-word;
  hyphens: auto;
}

.section-copy p + p {
  margin-top: clamp(16px, 2.2vw, 30px);
}

.section-copy strong {
  font-weight: 800;
}

.dark-screen {
  border-bottom-color: var(--color-paper-line);
  background: var(--color-ink);
  color: var(--color-paper);
}

.dark-screen .section-copy p {
  color: var(--color-paper-muted);
}

.contact-screen {
  min-height: calc(100svh - var(--header-height));
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto;
  background: var(--color-ink);
  color: var(--color-paper);
}

.contact {
  position: relative;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
  gap: clamp(56px, 9vw, 150px);
  align-items: center;
  overflow: hidden;
  padding: clamp(24px, 4vh, 48px) var(--page-padding);
  background: var(--color-ink);
  color: var(--color-paper);
}

.contact > .inquiry-form,
.contact > .contact-heading {
  position: relative;
  z-index: 2;
  width: 100%;
  max-width: calc(var(--content-width) / 2);
}

.inquiry-form {
  display: grid;
  gap: clamp(16px, 2vh, 24px);
}

.form-row {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(18px, 2.3vw, 34px);
}

.inquiry-form .form-field {
  display: grid;
  gap: 8px;
}

.field-label {
  color: rgba(245, 241, 232, 0.68);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.form-honeypot {
  position: absolute !important;
  left: -10000px !important;
  width: 1px !important;
  height: 1px !important;
  overflow: hidden !important;
}

.inquiry-form input,
.inquiry-form textarea {
  width: 100%;
  border: 0;
  border-bottom: 1px solid rgba(245, 241, 232, 0.34);
  border-radius: 0;
  outline: 0;
  padding: 9px 0 12px;
  background: transparent;
  color: var(--color-paper);
  font: inherit;
  font-size: 17px;
  transition: border-color var(--duration-fast) ease;
}

.inquiry-form textarea {
  min-height: 96px;
  resize: vertical;
  line-height: 1.4;
}

.inquiry-form input:focus,
.inquiry-form textarea:focus {
  border-bottom-color: var(--color-paper);
}

.field-error {
  color: var(--color-error);
  font-size: 13px;
  font-weight: 700;
  line-height: 1.35;
}

.field-error:empty {
  display: none;
}

.form-field.is-invalid input,
.form-field.is-invalid textarea {
  border-bottom-color: var(--color-error);
  animation: field-alert 280ms ease-in-out;
}

.form-field.is-invalid .field-label {
  color: var(--color-error);
}

@keyframes field-alert {
  0%, 100% { transform: translateX(0); }
  25% { transform: translateX(-5px); }
  75% { transform: translateX(5px); }
}

.inquiry-form input:-webkit-autofill,
.inquiry-form input:-webkit-autofill:hover,
.inquiry-form input:-webkit-autofill:focus {
  -webkit-text-fill-color: var(--color-paper);
  box-shadow: 0 0 0 1000px var(--color-ink) inset;
}

.contact-heading {
  justify-self: start;
}

.contact h2 {
  margin: 0;
  font-size: clamp(58px, 6.8vw, 108px);
  font-weight: 700;
  letter-spacing: -0.065em;
  line-height: 0.88;
}

.contact h2 span {
  display: block;
}

.contact-button {
  width: 100%;
  margin-top: 6px;
  background: var(--color-paper);
  color: var(--color-ink);
  cursor: pointer;
}

.contact-button:disabled {
  cursor: wait;
  opacity: 0.66;
}

.form-status {
  margin: 0;
  color: var(--color-paper-muted);
  font-size: 14px;
  font-weight: 700;
}

.form-status:empty {
  display: none;
}

.form-status.is-error {
  color: var(--color-error);
}

footer {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 30px;
  align-items: center;
  padding: 20px var(--page-padding);
  border-top: 1px solid rgba(245, 241, 232, 0.13);
  background: var(--color-ink);
  color: rgba(245, 241, 232, 0.54);
  font-size: 13px;
}

footer p {
  margin: 0;
}

footer > div {
  display: flex;
  gap: 24px;
}

footer a:not(.brand):hover,
footer a:not(.brand):focus-visible {
  color: var(--color-paper);
}

@media (max-width: 1050px) {
  .site-header {
    grid-template-columns: 1fr auto;
  }

  .site-header nav {
    display: none;
  }

  .story-screen {
    grid-template-columns: 1fr;
    gap: clamp(28px, 5vh, 48px);
    align-content: center;
  }

  .story-screen > * {
    max-width: 820px;
  }

  footer {
    grid-template-columns: 1fr 1fr;
  }

  footer > div {
    justify-self: end;
  }

  footer > span {
    grid-column: 2;
    justify-self: end;
  }
}

@media (max-width: 720px) {
  :root {
    --header-height: 64px;
    --page-padding: 22px;
    --body-copy-size: 19px;
  }

  .site-header {
    padding: 0 20px;
  }

  .site-header .brand {
    gap: 8px;
    font-size: 14px;
    letter-spacing: 0.08em;
  }

  .brand-logo {
    width: 51px;
    height: 51px;
  }

  .header-actions {
    gap: 8px;
  }

  .header-cta {
    font-size: 14px;
  }

  .linkedin-button {
    width: 34px;
    height: 34px;
    padding-bottom: 2px;
    font-size: 14px;
  }

  .hero-copy {
    padding: 56px 0;
  }

  .hero h1 {
    font-size: clamp(66px, 22vw, 102px);
    line-height: 0.82;
    white-space: normal;
  }

  .hero-intro {
    margin-top: 38px;
    font-size: 20px;
  }

  .hero-statement {
    margin-top: 18px;
    font-size: 22px;
  }

  .hero-actions {
    grid-template-columns: 1fr;
    margin-top: 36px;
  }

  .story-screen {
    gap: 44px;
    padding-top: 52px;
    padding-bottom: 52px;
  }

  .section-heading h2 {
    font-size: clamp(50px, 15vw, 76px);
  }

  .contact-screen {
    min-height: calc(100svh - var(--header-height));
  }

  .contact {
    min-height: auto;
    grid-template-columns: 1fr;
    gap: 52px;
    padding-top: 52px;
    padding-inline: 22px;
    padding-bottom: 78px;
  }

  .contact > .inquiry-form,
  .contact > .contact-heading {
    max-width: 820px;
  }

  .contact-heading {
    grid-row: 1;
    justify-self: start;
  }

  .inquiry-form {
    grid-row: 2;
  }

  .contact h2 {
    font-size: clamp(60px, 19vw, 88px);
  }

  .form-row {
    grid-template-columns: 1fr;
    gap: clamp(16px, 2vh, 24px);
  }

  footer {
    grid-template-columns: 1fr 1fr;
    gap: 14px 20px;
    padding: 18px 22px;
  }

  footer > div {
    flex-wrap: wrap;
    justify-content: flex-end;
    gap: 8px 16px;
  }
}

@media (min-width: 1051px) and (max-height: 900px) {
  :root {
    --body-copy-size: clamp(17px, 1.35vw, 21px);
  }

  .hero h1 {
    font-size: clamp(58px, 6.8vw, 104px);
  }

  .hero-intro {
    margin-top: clamp(22px, 3.5vh, 34px);
  }

  .hero-actions {
    margin-top: clamp(22px, 3.5vh, 34px);
  }

  .story-screen {
    gap: clamp(44px, 7vw, 110px);
    padding-block: clamp(20px, 3.5vh, 34px);
  }

  .section-heading h2 {
    font-size: clamp(48px, 5.4vw, 82px);
  }

  .section-copy p + p {
    margin-top: clamp(12px, 1.7vh, 18px);
  }

  .contact {
    gap: clamp(44px, 7vw, 110px);
    padding-block: clamp(18px, 3vh, 30px);
  }

  .inquiry-form {
    gap: clamp(10px, 1.3vh, 15px);
  }

  .inquiry-form textarea {
    min-height: 72px;
  }

  .contact h2 {
    font-size: clamp(54px, 5.8vw, 88px);
  }
}

@media (min-width: 1051px) and (max-height: 700px) {
  :root {
    --body-copy-size: 16px;
  }

  .story-screen,
  .contact {
    padding-block: 16px;
  }

  .section-copy p {
    line-height: 1.22;
  }

  .section-copy p + p {
    margin-top: 9px;
  }

  .section-heading h2 {
    font-size: clamp(44px, 5vw, 72px);
  }

  .inquiry-form {
    gap: 8px;
  }

  .inquiry-form input,
  .inquiry-form textarea {
    padding-block: 6px 8px;
  }

  .contact h2 {
    font-size: clamp(50px, 5.4vw, 78px);
  }
}

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

  html.discrete-scrolling {
    scroll-snap-type: y proximity;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}