:root {
  --color-bg: #F7F6F2;
  --color-bg-alt: #EFEBE2;
  --color-surface: #FFFFFF;
  --color-navy: #16324F;
  --color-navy-dark: #0F2338;
  --color-blue: #4C7EA8;
  --color-teal: #4F8B7C;
  --color-teal-dark: #386359;
  --color-text: #232A2E;
  --color-text-muted: #5C6469;
  --color-border: #DBD7CE;
  --color-border-strong: #C7C2B6;

  --color-warning-bg: #F6EAE4;
  --color-warning-text: #8A3F2C;
  --color-warning-border: #DEB9A9;
  --color-warning-fill: #A24B3A;

  --color-positive-bg: #E8F0E9;
  --color-positive-text: #34614A;
  --color-positive-border: #B7D3BE;
  --color-positive-fill: #4F8B7C;

  --font-base: 'Public Sans',
    -apple-system,
    BlinkMacSystemFont,
    'Segoe UI',
    Roboto,
    sans-serif;

  --max-width: 1180px;

  --radius-sm: 4px;
  --radius-md: 10px;

  --space-1: 0.5rem;
  --space-2: 0.875rem;
  --space-3: 1.5rem;
  --space-4: 2.25rem;
  --space-5: 3.5rem;
  --space-6: 5.5rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-base);
  color: var(--color-text);
  background: var(--color-bg);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

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

ul,
ol,
dl {
  margin: 0;
  padding: 0;
}

li {
  list-style: none;
}

h1,
h2,
h3,
h4,
p {
  margin: 0;
}

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

button {
  font-family: inherit;
  cursor: pointer;
}

input,
select,
button {
  font-size: 1rem;
  font-family: inherit;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -3rem;
  background: var(--color-navy);
  color: #fff;
  padding: 0.75rem 1.25rem;
  border-radius: var(--radius-sm);
  z-index: 200;
  transition: top 0.15s ease;
}

.skip-link:focus {
  top: 1rem;
}

:focus-visible {
  outline: 2px solid var(--color-blue);
  outline-offset: 3px;
  border-radius: 2px;
}

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

  html {
    scroll-behavior: auto;
  }

  * {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }

}

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.75rem;
}

.section-heading {
  max-width: 40rem;
  margin-bottom: var(--space-4);
}

.section-heading h2 {
  font-size: clamp(
    1.75rem,
    1.3vw + 1.3rem,
    2.375rem
  );

  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--color-navy-dark);
}

.section-heading p {
  margin-top: var(--space-2);
  color: var(--color-text-muted);
  font-size: 1.0625rem;
  max-width: 38rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;

  padding: 0.75rem 1.5rem;

  border-radius: var(--radius-sm);

  font-weight: 600;
  font-size: 0.9375rem;

  border: 1px solid transparent;

  transition:
    background-color 0.15s ease,
    border-color 0.15s ease,
    color 0.15s ease;
}

.btn-primary {
  background: var(--color-navy);
  color: #fff;
}

.btn-primary:hover {
  background: var(--color-navy-dark);
}

.btn-secondary {
  background: transparent;
  color: var(--color-navy);
  border-color: var(--color-border-strong);
}

.btn-secondary:hover {
  border-color: var(--color-navy);
  background: rgba(22, 50, 79, 0.04);
}

.btn-large {
  padding: 0.95rem 2rem;
  font-size: 1rem;
}

.btn-small {
  padding: 0.5rem 1.1rem;
  font-size: 0.875rem;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.text-link {
  color: var(--color-navy);
  font-weight: 600;

  border-bottom: 1px solid var(--color-border-strong);

  padding-bottom: 2px;

  transition:
    border-color 0.15s ease,
    color 0.15s ease;
}

.text-link:hover {
  color: var(--color-teal-dark);
  border-color: var(--color-teal-dark);
}



.site-header {
  position: sticky;
  top: 0;
  z-index: 100;

  background: rgba(247, 246, 242, 0.92);

  backdrop-filter: blur(6px);

  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;

  padding: 1.1rem 1.75rem;

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

  gap: 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;

  color: var(--color-navy-dark);
}

.brand-mark {
  color: var(--color-navy);
  flex-shrink: 0;
}

.brand-name {
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
}

.nav-menu {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-menu a {
  font-weight: 500;
  font-size: 0.9375rem;

  color: var(--color-text);

  padding: 0.4rem 0;

  border-bottom: 1px solid transparent;

  transition:
    border-color 0.15s ease,
    color 0.15s ease;
}

.nav-menu a:hover {
  color: var(--color-navy);
  border-color: var(--color-border-strong);
}

.nav-menu-cta {
  display: none;
}

.header-cta {
  flex-shrink: 0;
}

.nav-toggle {
  display: none;

  flex-direction: column;

  gap: 4px;

  background: none;
  border: none;

  padding: 0.5rem;
}

.nav-toggle-bar {
  width: 22px;
  height: 2px;

  background: var(--color-navy-dark);

  border-radius: 2px;
}



.hero {
  padding: var(--space-6) 0 var(--space-5);
}

.hero-inner {
  display: grid;

  grid-template-columns:
    minmax(0, 1fr)
    minmax(0, 0.85fr);

  gap: var(--space-5);

  align-items: center;
}

.hero-copy h1 {
  font-size: clamp(
    2.25rem,
    3vw + 1.4rem,
    3.5rem
  );

  font-weight: 800;

  letter-spacing: -0.02em;

  line-height: 1.1;

  color: var(--color-navy-dark);

  max-width: 16ch;
}

.hero-sub {
  margin-top: var(--space-3);

  font-size: 1.125rem;

  color: var(--color-text-muted);

  max-width: 38ch;

  line-height: 1.65;
}

.hero-actions {
  margin-top: var(--space-4);

  display: flex;
  align-items: center;

  gap: var(--space-3);

  flex-wrap: wrap;
}

.hero-visual {
  aspect-ratio: 1 / 1;

  max-width: 420px;

  margin: 0 auto;

  width: 100%;

  overflow: visible;
}

.hero-visual svg {
  overflow: visible;
}

.ecg-line {
  stroke-dasharray: 1000;

  stroke-dashoffset: 1000;

  animation:
    ecg-draw 3.5s ease-in-out infinite;
}

.ecg-point {
  transform-box: fill-box;

  transform-origin: center;

  animation:
    ecg-pulse 1.8s ease-in-out infinite;
}

.ecg-point-two {
  animation-delay: 0.9s;
}

@keyframes ecg-draw {

  0% {
    stroke-dashoffset: 1000;
  }

  45% {
    stroke-dashoffset: 0;
  }

  70% {
    stroke-dashoffset: 0;
  }

  100% {
    stroke-dashoffset: -1000;
  }

}

@keyframes ecg-pulse {

  0%,
  100% {
    transform: scale(1);
    opacity: 0.75;
  }

  50% {
    transform: scale(1.65);
    opacity: 1;
  }

}



.trust-strip {
  border-top: 1px solid var(--color-border);

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

  background: var(--color-bg-alt);
}

.trust-inner {
  display: grid;

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

  padding:
    var(--space-4)
    1.75rem;
}

.trust-item {
  display: flex;

  flex-direction: column;

  gap: 0.35rem;

  padding:
    0
    var(--space-3);

  border-left:
    1px solid
    var(--color-border);
}

.trust-item:first-child {
  border-left: none;

  padding-left: 0;
}

.trust-figure {
  font-size: 1.75rem;

  font-weight: 700;

  color: var(--color-navy);

  letter-spacing: -0.01em;
}

.trust-label {
  font-size: 0.9375rem;

  color: var(--color-text-muted);
}


.assessment {
  padding: var(--space-6) 0;
}

#assessment-form {
  background: var(--color-surface);

  border:
    1px solid
    var(--color-border);

  border-radius: var(--radius-md);

  padding: var(--space-4);
}

.form-section {
  border: none;

  padding: 0;

  margin:
    0
    0
    var(--space-4);

  padding-bottom: var(--space-4);

  border-bottom:
    1px solid
    var(--color-border);
}

.form-section:last-of-type {
  border-bottom: none;

  margin-bottom: var(--space-3);

  padding-bottom: 0;
}

.form-section legend {
  font-size: 1.0625rem;

  font-weight: 700;

  color: var(--color-navy-dark);

  padding:
    0
    0
    var(--space-3);

  width: 100%;
}

.field-grid {
  display: grid;

  grid-template-columns:
    repeat(
      2,
      minmax(0, 1fr)
    );

  gap:
    var(--space-3)
    var(--space-4);
}

.field {
  display: flex;

  flex-direction: column;
}

.field label {
  font-weight: 600;

  font-size: 0.9375rem;

  color: var(--color-text);

  margin-bottom: 0.45rem;
}

.field input,
.field select {
  padding:
    0.7rem
    0.85rem;

  border:
    1px solid
    var(--color-border-strong);

  border-radius: var(--radius-sm);

  background: var(--color-surface);

  color: var(--color-text);

  transition:
    border-color 0.15s ease,
    box-shadow 0.15s ease;
}

.field select {
  appearance: none;

  background-image:
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='9' viewBox='0 0 14 9'%3E%3Cpath d='M1 1l6 6 6-6' fill='none' stroke='%235C6469' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");

  background-repeat: no-repeat;

  background-position:
    right 0.85rem center;

  padding-right: 2.25rem;
}

.field input:focus,
.field select:focus {
  border-color: var(--color-blue);

  box-shadow:
    0 0 0 3px
    rgba(76, 126, 168, 0.18);
}

.field input.field-invalid,
.field select.field-invalid {
  border-color:
    var(--color-warning-fill);
}

.field-help {
  margin-top: 0.4rem;

  font-size: 0.8125rem;

  color: var(--color-text-muted);
}

.field-error {
  margin-top: 0.4rem;

  font-size: 0.8125rem;

  color: var(--color-warning-fill);

  min-height: 1em;
}

.form-actions {
  display: flex;

  align-items: center;

  justify-content: flex-end;

  gap: var(--space-3);

  flex-wrap: wrap;

  padding-top: var(--space-2);
}

.form-status {
  font-size: 0.9375rem;

  color: var(--color-warning-fill);

  font-weight: 500;
}

.btn-spinner {
  width: 14px;

  height: 14px;

  border-radius: 50%;

  border:
    2px solid
    rgba(255, 255, 255, 0.4);

  border-top-color: #fff;

  display: none;
}

#submit-btn.is-loading .btn-spinner {
  display: inline-block;

  animation:
    spin 0.7s linear infinite;
}

@keyframes spin {

  to {
    transform: rotate(360deg);
  }

}



.result-section {
  padding:
    0
    0
    var(--space-6);
}

.result-card,
.error-card {
  background: var(--color-surface);

  border:
    1px solid
    var(--color-border);

  border-radius: var(--radius-md);

  padding: var(--space-4);

  max-width: 40rem;
}

.result-card h2,
.error-card h2 {
  font-size: 1.375rem;

  font-weight: 700;

  color: var(--color-navy-dark);
}

.result-message {
  margin-top: var(--space-2);

  font-size: 1.625rem;

  font-weight: 700;

  padding:
    0.9rem
    1.1rem;

  border-radius: var(--radius-sm);

  border:
    1px solid
    var(--color-border);
}

.result-card.result-warning .result-message {
  background:
    var(--color-warning-bg);

  color:
    var(--color-warning-text);

  border-color:
    var(--color-warning-border);
}

.result-card.result-positive .result-message {
  background:
    var(--color-positive-bg);

  color:
    var(--color-positive-text);

  border-color:
    var(--color-positive-border);
}

.result-probability {
  margin-top: var(--space-3);
}

.probability-header {
  display: flex;

  justify-content: space-between;

  font-size: 0.9375rem;

  font-weight: 600;

  color: var(--color-text-muted);

  margin-bottom: 0.5rem;
}

.probability-value {
  color: var(--color-navy-dark);

  font-weight: 700;
}

.probability-meter {
  height: 10px;

  border-radius: 999px;

  background: var(--color-bg-alt);

  border:
    1px solid
    var(--color-border);

  overflow: hidden;
}

.probability-fill {
  height: 100%;

  width: 0%;

  background: var(--color-teal);

  border-radius: 999px;

  transition:
    width 0.5s ease;
}

.result-card.result-warning .probability-fill {
  background:
    var(--color-warning-fill);
}

.result-card.result-positive .probability-fill {
  background:
    var(--color-positive-fill);
}

.result-note {
  margin-top: var(--space-2);

  font-size: 0.875rem;

  color: var(--color-text-muted);
}

.result-card .btn,
.error-card .btn {
  margin-top: var(--space-3);
}

.error-card {
  border-color:
    var(--color-warning-border);

  background:
    var(--color-warning-bg);
}

.error-card p {
  margin-top: 0.6rem;

  color:
    var(--color-warning-text);
}




.how-it-works {
  padding: var(--space-6) 0;

  background: var(--color-bg-alt);

  border-top:
    1px solid
    var(--color-border);

  border-bottom:
    1px solid
    var(--color-border);
}

.steps {
  display: grid;

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

  gap: var(--space-4);
}

.step-number {
  display: block;

  font-size: 0.9375rem;

  font-weight: 700;

  color: var(--color-teal-dark);

  margin-bottom: var(--space-2);
}

.step h3 {
  font-size: 1.125rem;

  font-weight: 700;

  color: var(--color-navy-dark);

  margin-bottom: 0.5rem;
}

.step p {
  color: var(--color-text-muted);

  font-size: 0.9375rem;
}


.about {
  padding: var(--space-6) 0;
}

.about-grid {
  display: grid;

  grid-template-columns:
    minmax(0, 1.1fr)
    minmax(0, 0.9fr);

  gap: var(--space-5);

  align-items: start;
}

.about-copy h2 {
  font-size: clamp(
    1.75rem,
    1.3vw + 1.3rem,
    2.375rem
  );

  font-weight: 700;

  color: var(--color-navy-dark);

  margin-bottom: var(--space-3);
}

.about-copy p {
  color: var(--color-text-muted);

  font-size: 1.0625rem;

  max-width: 42ch;
}

.tech-list {
  border-top:
    1px solid
    var(--color-border);
}

.tech-item {
  display: flex;

  justify-content: space-between;

  gap: 1rem;

  padding: 0.95rem 0;

  border-bottom:
    1px solid
    var(--color-border);
}

.tech-item dt {
  color: var(--color-text-muted);

  font-size: 0.9375rem;
}

.tech-item dd {
  margin: 0;

  font-weight: 600;

  color: var(--color-navy-dark);

  text-align: right;
}



.site-footer {
  border-top:
    1px solid
    var(--color-border);

  padding: var(--space-4) 0;
}

.footer-inner {
  display: flex;

  justify-content: space-between;

  align-items: flex-end;

  flex-wrap: wrap;

  gap: var(--space-3);
}

.footer-brand .brand-name {
  font-size: 1.0625rem;

  font-weight: 700;

  color: var(--color-navy-dark);
}

.footer-brand p {
  margin-top: 0.2rem;

  color: var(--color-text-muted);

  font-size: 0.875rem;
}

.footer-meta {
  text-align: right;
}

.footer-meta p {
  font-size: 0.8125rem;

  color: var(--color-text-muted);
}


@media (max-width: 900px) {

  .hero-inner {
    grid-template-columns: 1fr;
  }

  .hero-visual {
    order: -1;

    max-width: 300px;
  }

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

  .steps {
    grid-template-columns: 1fr;

    gap: var(--space-3);
  }

  .trust-inner {
    grid-template-columns:
      repeat(3, 1fr);

    row-gap: var(--space-3);
  }

}



@media (max-width: 720px) {

  .site-nav {
    position: absolute;

    top: 100%;

    left: 0;
    right: 0;

    background: var(--color-surface);

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

    display: block;
  }

  .nav-menu {
    display: none;

    flex-direction: column;

    align-items: flex-start;

    gap: 0;

    padding:
      0.5rem
      1.75rem
      1.25rem;
  }

  .nav-menu.is-open {
    display: flex;
  }

  .nav-menu li {
    width: 100%;
  }

  .nav-menu a {
    display: block;

    padding: 0.75rem 0;
  }

  .nav-menu-cta {
    display: block;

    margin-top: 0.5rem;
  }

  .nav-menu-cta .btn {
    width: 100%;
  }

  .nav-toggle {
    display: flex;
  }

  .header-cta {
    display: none;
  }

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

  .form-actions {
    justify-content: stretch;
  }

  .form-actions .btn {
    width: 100%;
  }

  .footer-inner {
    align-items: flex-start;
  }

  .footer-meta {
    text-align: left;
  }

}



@media (max-width: 480px) {

  .section-inner {
    padding:
      0
      1.25rem;
  }

  .header-inner {
    padding:
      1rem
      1.25rem;
  }

  #assessment-form {
    padding: var(--space-3);
  }

}