/* ==========================================================================
   Behavioral Health Intelligence Platform — Stylesheet
   Design system: CSS custom properties drive typography, spacing, color,
   borders, radii, and layout sizing across all components.
   ========================================================================== */

:root {
  /* Color palette — enterprise healthcare: deep navy/teal, neutral grays */
  --color-brand: #0d3b46;
  --color-brand-dark: #082a32;
  --color-brand-tint: #eef4f4;
  --color-accent: #1c8090;
  --color-accent-dark: #146672;
  --color-accent-tint: #e3f1f2;

  --color-ink: #101e24;
  --color-body: #40525a;
  --color-muted: #64767d;
  --color-border: #e2e8e9;
  --color-border-strong: #c7d2d3;
  --color-surface: #ffffff;
  --color-surface-tint: #f7f9f9;
  --color-surface-sunken: #eef2f2;

  --color-status-review: #92620a;
  --color-status-review-bg: #fbf0da;
  --color-status-stable: #1c7a4c;
  --color-status-stable-bg: #e3f3ea;
  --color-status-change: #2a5b95;
  --color-status-change-bg: #e6edf7;

  /* Typography */
  --font-base: "Inter", -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;

  --fs-label: 0.8125rem;
  --fs-small: 0.9375rem;
  --fs-body: 1.0625rem;
  --fs-subhead: clamp(1.25rem, 1.1rem + 0.6vw, 1.5rem);
  --fs-h2: clamp(2rem, 1.6rem + 1.8vw, 2.6rem);
  --fs-h1: clamp(2.4rem, 1.9rem + 2.6vw, 3.6rem);

  --lh-tight: 1.15;
  --lh-snug: 1.35;
  --lh-normal: 1.65;

  --ls-tight: -0.02em;

  /* Spacing scale */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2.25rem;
  --space-7: 3.5rem;
  --space-8: 5.5rem;
  --space-9: 7.5rem;

  /* Borders & radii */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 20px;
  --radius-pill: 999px;
  --border-width: 1px;

  /* Layout */
  --container-max: 1240px;
  --container-narrow: 720px;
  --header-height: 76px;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(13, 59, 70, 0.05);
  --shadow-sm: 0 2px 8px rgba(13, 59, 70, 0.06);
  --shadow-md: 0 10px 30px rgba(13, 59, 70, 0.09);
  --shadow-lg: 0 24px 60px rgba(13, 59, 70, 0.14);

  /* Motion */
  --transition-fast: 160ms ease;
  --transition-base: 260ms cubic-bezier(0.2, 0.6, 0.3, 1);
}

/* ==========================================================================
   Reset & base
   ========================================================================== */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-base);
  font-size: var(--fs-body);
  line-height: var(--lh-normal);
  color: var(--color-body);
  background: var(--color-surface);
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

h1, h2, h3, h4 {
  color: var(--color-ink);
  line-height: var(--lh-tight);
  letter-spacing: var(--ls-tight);
  margin: 0 0 var(--space-4);
  font-weight: 700;
}

h1 { font-size: var(--fs-h1); }
h2 { font-size: var(--fs-h2); }
h3 { font-size: 1.1rem; letter-spacing: -0.01em; }

p { margin: 0 0 var(--space-4); max-width: 68ch; }
p:last-child { margin-bottom: 0; }

ul, ol { padding-left: 1.1rem; }

a { color: var(--color-accent); }

/* Visible keyboard focus states */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-brand-dark);
  color: #fff;
  padding: var(--space-3) var(--space-5);
  z-index: 1000;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

.container {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
}
.container--narrow { max-width: var(--container-narrow); }

/* Scroll-reveal: progressively enhanced by script.js adding .is-visible */
.reveal {
  opacity: 1;
  transform: none;
}
.reveal.js-reveal {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 560ms ease, transform 560ms ease;
}
.reveal.js-reveal.is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .reveal.js-reveal { opacity: 1; transform: none; }
}

/* ==========================================================================
   Buttons
   ========================================================================== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: 0.85rem 1.65rem;
  border-radius: var(--radius-sm);
  font-size: var(--fs-small);
  font-weight: 600;
  text-decoration: none;
  border: var(--border-width) solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast), border-color var(--transition-fast),
    transform var(--transition-fast), box-shadow var(--transition-fast);
}
.btn:hover { transform: translateY(-2px); }
.btn--sm { padding: 0.6rem 1.25rem; }

.btn--primary {
  background: var(--color-brand);
  color: #fff;
  box-shadow: var(--shadow-xs);
}
.btn--primary:hover { background: var(--color-brand-dark); box-shadow: var(--shadow-sm); }

.btn--secondary {
  background: var(--color-surface);
  color: var(--color-brand);
  border-color: var(--color-border-strong);
}
.btn--secondary:hover { background: var(--color-surface-tint); border-color: var(--color-accent); }

.btn--on-dark.btn--secondary {
  background: transparent;
  color: #fff;
  border-color: rgba(255, 255, 255, 0.4);
}
.btn--on-dark.btn--secondary:hover { background: rgba(255, 255, 255, 0.08); border-color: #fff; }
.btn--on-dark.btn--primary { background: #fff; color: var(--color-brand-dark); }
.btn--on-dark.btn--primary:hover { background: #eef4f4; }

.btn--evidence {
  background: var(--color-surface);
  color: var(--color-accent);
  border-color: var(--color-accent);
  font-size: var(--fs-label);
  padding: 0.5rem 1rem;
  margin-top: var(--space-3);
}
.btn--evidence:hover { background: var(--color-accent-tint); }
.btn--evidence[aria-expanded="true"] { background: var(--color-accent); color: #fff; }

.link-toggle {
  background: none;
  border: none;
  color: var(--color-accent-dark);
  font-weight: 600;
  font-size: var(--fs-small);
  cursor: pointer;
  padding: 0.5rem 0;
  text-decoration: underline;
  text-underline-offset: 3px;
}
.link-toggle:hover { color: var(--color-brand); }

/* ==========================================================================
   Header / Navigation
   ========================================================================== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.7);
  border-bottom: var(--border-width) solid transparent;
  transition: background-color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}
.site-header.is-scrolled {
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: saturate(180%) blur(10px);
  -webkit-backdrop-filter: saturate(180%) blur(10px);
  border-bottom-color: var(--color-border);
  box-shadow: var(--shadow-xs);
}

.navbar {
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-5);
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-5);
}

.navbar__brand {
  font-weight: 700;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
  color: var(--color-ink);
  text-decoration: none;
  white-space: nowrap;
}

.navbar__menu {
  display: flex;
  align-items: center;
  gap: var(--space-6);
}

.navbar__links {
  list-style: none;
  display: flex;
  gap: var(--space-5);
  margin: 0;
  padding: 0;
}

.navbar__links a {
  color: var(--color-body);
  text-decoration: none;
  font-size: var(--fs-small);
  font-weight: 500;
  padding: var(--space-2) 0;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color var(--transition-fast), border-color var(--transition-fast);
}
.navbar__links a:hover { color: var(--color-brand); border-color: var(--color-accent); }

.navbar__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-2);
}
.navbar__toggle-bar {
  width: 22px;
  height: 2px;
  background: var(--color-ink);
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* ==========================================================================
   Hero
   ========================================================================== */
.hero {
  position: relative;
  padding-block: var(--space-9) var(--space-8);
  overflow: hidden;
}

.hero__backdrop {
  position: absolute;
  inset: -10% -10% auto -10%;
  height: 130%;
  background:
    radial-gradient(560px 360px at 14% 8%, rgba(28, 128, 144, 0.10), transparent 65%),
    radial-gradient(640px 420px at 90% 20%, rgba(13, 59, 70, 0.07), transparent 60%),
    linear-gradient(180deg, var(--color-brand-tint) 0%, var(--color-surface) 78%);
  z-index: -1;
}

.hero__grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: var(--space-8);
  align-items: center;
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-4);
}

.hero h1 {
  margin-bottom: var(--space-5);
}

.hero__lead {
  font-size: var(--fs-subhead);
  line-height: var(--lh-snug);
  color: var(--color-body);
  max-width: 56ch;
}

.hero__actions {
  display: flex;
  gap: var(--space-4);
  margin-top: var(--space-6);
  flex-wrap: wrap;
}

.hero__trust-note {
  margin-top: var(--space-6);
  font-size: var(--fs-label);
  color: var(--color-muted);
  max-width: 48ch;
}

/* Hero flow diagram */
.hero__visual { display: flex; justify-content: center; }

.flow-diagram {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
  width: 100%;
  max-width: 460px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
}

.flow-diagram__label {
  align-self: flex-start;
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 var(--space-2);
}

.flow-diagram__sources,
.flow-diagram__outputs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  justify-content: center;
  width: 100%;
}

.flow-node {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  background: var(--color-surface-tint);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-2) var(--space-3);
  font-size: var(--fs-label);
  font-weight: 600;
  color: var(--color-body);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.flow-node:hover { transform: translateY(-2px); box-shadow: var(--shadow-xs); border-color: var(--color-accent); }

.flow-node__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  flex-shrink: 0;
}

.flow-node--output {
  background: var(--color-accent-tint);
  border-color: var(--color-accent);
  color: var(--color-brand-dark);
  font-weight: 700;
  padding: var(--space-3) var(--space-4);
}

.flow-diagram__connectors { width: 60px; height: 26px; color: var(--color-border-strong); }
.flow-diagram__connectors svg { width: 100%; height: 100%; }
.flow-diagram__connectors path {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.4;
}

.flow-diagram__core {
  background: var(--color-brand);
  color: #fff;
  border-radius: var(--radius-md);
  padding: var(--space-4) var(--space-5);
  text-align: center;
  width: 100%;
  box-shadow: var(--shadow-sm);
}
.flow-diagram__core-eyebrow {
  display: block;
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  opacity: 0.75;
  margin-bottom: 0.2rem;
}
.flow-diagram__core-label { font-weight: 700; font-size: var(--fs-small); }

/* ==========================================================================
   Trust strip
   ========================================================================== */
.trust-strip {
  border-block: var(--border-width) solid var(--color-border);
  background: var(--color-surface-tint);
}
.trust-strip__inner {
  padding-block: var(--space-4);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  flex-wrap: wrap;
}
.trust-strip__label {
  font-size: var(--fs-label);
  font-weight: 600;
  color: var(--color-muted);
  margin: 0;
}
.trust-strip__list {
  list-style: none;
  display: flex;
  gap: var(--space-5);
  margin: 0;
  padding: 0;
  flex-wrap: wrap;
}
.trust-strip__list li {
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-brand);
}

/* ==========================================================================
   Sections (shared)
   ========================================================================== */
.section { padding-block: var(--space-8); }
.section--tint { background: var(--color-surface-tint); }
.section--emphasis {
  background: linear-gradient(160deg, var(--color-brand) 0%, var(--color-brand-dark) 100%);
  color: #fff;
}
.section--emphasis h2, .section--emphasis .section__intro { color: #fff; }

.section__header {
  max-width: 760px;
  margin-bottom: var(--space-7);
}
.section__header--center {
  max-width: 680px;
  margin-inline: auto;
  text-align: center;
}

.section__kicker {
  display: inline-block;
  font-size: var(--fs-label);
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--color-accent-dark);
  margin-bottom: var(--space-3);
}
.section__kicker--on-dark { color: rgba(255, 255, 255, 0.75); }

.section__intro {
  font-size: var(--fs-subhead);
  line-height: var(--lh-snug);
  color: var(--color-muted);
}
.section--emphasis .section__intro { color: rgba(255,255,255,0.86); }

.section__subtitle {
  font-size: var(--fs-subhead);
  color: var(--color-accent-dark);
  font-weight: 600;
}

.section__note {
  margin-top: var(--space-6);
  font-size: var(--fs-small);
  color: var(--color-muted);
  border-left: 3px solid var(--color-accent);
  padding-left: var(--space-4);
  max-width: 780px;
}

/* ==========================================================================
   Difference section
   ========================================================================== */
.difference__grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-5) var(--space-7);
  margin-top: var(--space-6);
}
.difference__grid p {
  font-size: var(--fs-small);
  color: var(--color-body);
  padding-left: var(--space-4);
  border-left: 2px solid var(--color-border-strong);
  max-width: none;
}

/* ==========================================================================
   Cards & grids
   ========================================================================== */
.card-grid {
  display: grid;
  gap: var(--space-5);
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}
.card-grid--2 { grid-template-columns: repeat(2, 1fr); }
.card-grid--3 { grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); }
.card-grid--4 { grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }

.card {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}
.card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--color-border-strong); }
.card--compact { padding: var(--space-5); }

.card__tag {
  display: inline-block;
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-accent-dark);
  background: var(--color-accent-tint);
  border-radius: var(--radius-pill);
  padding: 0.15rem 0.6rem;
  margin-bottom: var(--space-3);
}

/* Problem section */
.problem-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-5);
  align-items: stretch;
}
.problem-card {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  position: relative;
}
.problem-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); }
.problem-card--featured {
  background: var(--color-brand-tint);
  border-color: var(--color-border-strong);
}
.problem-card__index {
  display: block;
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-muted);
  margin-bottom: var(--space-4);
}
.problem-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-tint);
  color: var(--color-accent-dark);
  margin-bottom: var(--space-4);
  flex-shrink: 0;
}
.problem-card__icon svg { display: block; width: 22px; height: 22px; }

/* Capability cards */
.capability-grid {
  display: grid;
  gap: var(--space-5);
}
.capability-card {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}
.capability-card:hover { box-shadow: var(--shadow-md); transform: translateY(-3px); border-color: var(--color-accent); }
.capability-card__icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: var(--radius-sm);
  background: var(--color-accent-tint);
  color: var(--color-accent-dark);
  margin-bottom: var(--space-4);
}
.capability-card__icon svg { width: 22px; height: 22px; }

.card--status { text-align: left; }
.status-dot {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  margin-bottom: var(--space-3);
}
.status-dot--building { background: var(--color-status-change); }
.status-dot--validating { background: var(--color-status-review); }
.status-dot--preparing { background: var(--color-status-stable); }

/* ==========================================================================
   Platform split layout
   ========================================================================== */
.platform-split {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: var(--space-8);
  align-items: start;
}
.platform-split__text { position: sticky; top: calc(var(--header-height) + var(--space-6)); }

.responsible-split {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: var(--space-8);
  align-items: start;
}
.responsible-split__grid { display: flex; flex-direction: column; gap: var(--space-5); }
.principle-highlight {
  background: var(--color-brand);
  color: #fff;
  border-radius: var(--radius-lg);
  padding: var(--space-6);
}
.principle-highlight h3 { color: #fff; }
.principle-highlight p { color: rgba(255,255,255,0.85); }

/* ==========================================================================
   Workflow (Signal -> Evidence -> Human Review -> Action)
   ========================================================================== */
.workflow {
  display: flex;
  align-items: stretch;
  list-style: none;
  margin: 0 0 var(--space-6);
  padding: 0;
  flex-wrap: wrap;
}

.workflow__step {
  flex: 1 1 200px;
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-5);
  text-align: center;
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
}
.workflow__step:hover { box-shadow: var(--shadow-sm); transform: translateY(-2px); }
.workflow__step h3 { margin-bottom: var(--space-2); }
.workflow__step p { font-size: var(--fs-small); color: var(--color-muted); margin-inline: auto; }

.workflow__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-accent-tint);
  color: var(--color-accent-dark);
  margin: 0 auto var(--space-3);
}
.workflow__icon svg { width: 20px; height: 20px; }

.workflow__index {
  display: block;
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-muted);
  margin-bottom: var(--space-2);
}

.workflow__connector {
  flex: 0 0 32px;
  align-self: center;
  height: 2px;
  background: var(--color-border-strong);
  min-width: 24px;
  position: relative;
}
.workflow__connector::after {
  content: "";
  position: absolute;
  right: -1px;
  top: 50%;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--color-accent);
  transform: translateY(-50%);
}

.workflow--compact .workflow__step { padding: var(--space-4); }

@media (max-width: 860px) {
  .workflow { flex-direction: column; }
  .workflow__connector { width: 2px; height: 24px; align-self: center; }
}
/* ==========================================================================
   Patient 360 — enterprise app shell mockup
   ========================================================================== */
.app-shell {
  position: relative;
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
}

.app-shell__badge {
  position: absolute;
  top: var(--space-4);
  right: var(--space-4);
  z-index: 2;
  background: var(--color-status-review-bg);
  color: var(--color-status-review);
  font-size: var(--fs-label);
  font-weight: 700;
  padding: 0.3rem 0.85rem;
  border-radius: var(--radius-pill);
}

.app-shell__toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  border-bottom: var(--border-width) solid var(--color-border);
  background: var(--color-surface-tint);
}
.app-shell__toolbar-brand { display: flex; align-items: center; gap: var(--space-2); }
.app-shell__toolbar-title {
  margin-left: var(--space-3);
  font-size: var(--fs-label);
  font-weight: 600;
  color: var(--color-muted);
}
.app-shell__dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.app-shell__dot--red { background: #e0857a; }
.app-shell__dot--amber { background: #e3b95c; }
.app-shell__dot--green { background: #6cb389; }

.app-shell__body { display: grid; grid-template-columns: 176px 1fr; }

.app-shell__rail {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4) var(--space-3);
  border-right: var(--border-width) solid var(--color-border);
  background: var(--color-surface-tint);
}
.app-shell__rail-item {
  font-size: var(--fs-small);
  color: var(--color-muted);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-sm);
  font-weight: 500;
}
.app-shell__rail-item--active {
  background: var(--color-surface);
  color: var(--color-brand);
  font-weight: 700;
  box-shadow: var(--shadow-xs);
}

.app-shell__main { padding: var(--space-5); }

.app-shell__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
  margin-top: var(--space-4);
}

.mock-card {
  background: var(--color-surface-tint);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-5);
}
.mock-card--highlight {
  background: var(--color-accent-tint);
  border-color: var(--color-accent);
}
.mock-card--header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-4);
  background: var(--color-brand-tint);
}

.mock-patient { display: flex; align-items: center; gap: var(--space-4); }
.mock-patient__avatar {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--color-brand);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 700;
  flex-shrink: 0;
}
.mock-patient__name { font-weight: 700; color: var(--color-ink); margin: 0; }
.mock-patient__meta { font-size: var(--fs-label); color: var(--color-muted); margin: 0; }

.mock-indicators { display: flex; gap: var(--space-2); flex-wrap: wrap; }

.pill {
  display: inline-block;
  font-size: var(--fs-label);
  font-weight: 700;
  padding: 0.3rem 0.7rem;
  border-radius: var(--radius-pill);
}
.pill--review { background: var(--color-status-review-bg); color: var(--color-status-review); }
.pill--stable { background: var(--color-status-stable-bg); color: var(--color-status-stable); }
.pill--change { background: var(--color-status-change-bg); color: var(--color-status-change); }

.timeline { list-style: none; padding: 0; margin: 0; font-size: var(--fs-small); }
.timeline li { padding-block: var(--space-2); border-bottom: var(--border-width) solid var(--color-border); }
.timeline li:last-child { border-bottom: none; }
.timeline__date { font-weight: 700; color: var(--color-brand); margin-right: var(--space-2); }

.indicator-list { margin: 0; }
.indicator-list__row {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-block: var(--space-2);
  border-bottom: var(--border-width) solid var(--color-border);
}
.indicator-list__row:last-child { border-bottom: none; }
.indicator-list__row dt { font-weight: 600; color: var(--color-ink); }
.indicator-list__row dd { margin: 0; }

.doc-list { list-style: none; padding: 0; margin: 0; font-size: var(--fs-small); }
.doc-list li { padding-block: var(--space-1); }

.evidence-panel {
  margin-top: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
  border: var(--border-width) dashed var(--color-border-strong);
  border-radius: var(--radius-sm);
  font-size: var(--fs-small);
}
.evidence-panel ul { margin: 0; padding-left: 1.1rem; }
.evidence-panel[hidden] { display: none; }

@media (max-width: 960px) {
  .app-shell__grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .app-shell__grid { grid-template-columns: 1fr; }
  .app-shell__body { grid-template-columns: 1fr; }
  .app-shell__rail { display: none; }
}

/* ==========================================================================
   Care Copilot
   ========================================================================== */
.copilot {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-md);
  padding: var(--space-6);
}

.copilot__status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-status-stable);
  background: var(--color-status-stable-bg);
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-pill);
  margin-bottom: var(--space-5);
}
.copilot__status-dot { width: 7px; height: 7px; border-radius: 50%; background: var(--color-status-stable); }

.copilot__suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-5);
}

.chip {
  background: var(--color-surface-tint);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-pill);
  padding: var(--space-2) var(--space-4);
  font-size: var(--fs-label);
  cursor: pointer;
  color: var(--color-body);
  transition: background-color var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast);
}
.chip:hover { background: var(--color-accent-tint); border-color: var(--color-accent); transform: translateY(-1px); }

.copilot__conversation {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.copilot__message {
  padding: var(--space-4) var(--space-5);
  border-radius: var(--radius-md);
  max-width: 80%;
  font-size: var(--fs-small);
}
.copilot__message--user {
  align-self: flex-end;
  background: var(--color-brand);
  color: #fff;
}
.copilot__message--ai {
  align-self: flex-start;
  background: var(--color-surface-tint);
  border: var(--border-width) solid var(--color-border);
}
.copilot__evidence-label { font-weight: 700; margin-bottom: var(--space-2); }

.source-chips { display: flex; flex-wrap: wrap; gap: var(--space-2); margin-bottom: var(--space-2); }
.source-chip {
  display: inline-flex;
  align-items: center;
  font-size: var(--fs-label);
  font-weight: 600;
  color: var(--color-accent-dark);
  background: var(--color-accent-tint);
  border: var(--border-width) solid var(--color-accent);
  border-radius: var(--radius-pill);
  padding: 0.25rem 0.7rem;
}

.copilot__disclaimer {
  margin-top: var(--space-5);
  font-size: var(--fs-label);
  color: var(--color-muted);
}

/* ==========================================================================
   Operational alert panel
   ========================================================================== */
.alert-panel {
  display: grid;
  grid-template-columns: 1.1fr 1.4fr auto;
  gap: var(--space-6);
  align-items: center;
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-left: 4px solid var(--color-status-review);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
}
.alert-panel__status { display: flex; align-items: center; gap: var(--space-4); }
.alert-panel__flag {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: var(--color-status-review-bg);
  color: var(--color-status-review);
  flex-shrink: 0;
}
.alert-panel__flag svg { width: 22px; height: 22px; }
.alert-panel__status h3 { margin-bottom: var(--space-1); }
.alert-panel__lead { font-weight: 700; color: var(--color-status-review); margin: 0; font-size: var(--fs-small); }

.alert-panel__details {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  border-left: var(--border-width) solid var(--color-border);
  padding-left: var(--space-6);
}
.alert-panel__detail { display: flex; justify-content: space-between; gap: var(--space-4); font-size: var(--fs-small); }
.alert-panel__label { color: var(--color-muted); }

.alert-panel__action { display: flex; flex-direction: column; align-items: flex-start; }

@media (max-width: 900px) {
  .alert-panel { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Interoperability diagram
   ========================================================================== */
.interop-diagram {
  display: grid;
  grid-template-columns: 1fr auto 1fr auto 1fr;
  gap: var(--space-4);
  align-items: center;
  margin-bottom: var(--space-6);
}
.interop-diagram__column { display: flex; flex-direction: column; gap: var(--space-3); }
.interop-diagram__column-label {
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.06em;
  margin: 0 0 var(--space-1);
}
.interop-diagram__node {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-weight: 600;
  font-size: var(--fs-small);
  color: var(--color-ink);
  box-shadow: var(--shadow-xs);
  text-align: center;
}
.interop-diagram__node--core { background: var(--color-brand-tint); border-color: var(--color-border-strong); }
.interop-diagram__node--output { background: var(--color-brand); color: #fff; border-color: var(--color-brand); }
.interop-diagram__arrow { color: var(--color-accent); font-size: 1.3rem; }

.standards-strip {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  padding: 0;
  margin: 0;
}
.standards-strip li {
  font-size: var(--fs-label);
  font-weight: 700;
  color: var(--color-accent-dark);
  background: var(--color-accent-tint);
  border-radius: var(--radius-pill);
  padding: 0.35rem 0.9rem;
}
.standards-strip--muted li { color: var(--color-muted); background: var(--color-surface-sunken); }

@media (max-width: 900px) {
  .interop-diagram { grid-template-columns: 1fr; }
  .interop-diagram__arrow { transform: rotate(90deg); justify-self: center; }
}

/* ==========================================================================
   Video section
   ========================================================================== */
.video-preview {
  display: block;
  width: 100%;
  max-width: 900px;
  margin-inline: auto;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: #000;
  box-shadow: var(--shadow-lg);
  object-fit: contain;
}

.video-caption {
  max-width: 640px;
  margin: var(--space-5) auto 0;
  text-align: center;
  color: var(--color-muted);
}

.center-cta { text-align: center; margin-top: var(--space-6); }
.center-cta--row { display: flex; justify-content: center; gap: var(--space-4); flex-wrap: wrap; }

/* ==========================================================================
   Current development — journey
   ========================================================================== */
.journey {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: var(--space-5);
  position: relative;
}
.journey__step {
  flex: 1;
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  position: relative;
}
.journey__step--active { border-color: var(--color-accent); box-shadow: var(--shadow-sm); }
.journey__marker {
  display: block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--color-border-strong);
  margin-bottom: var(--space-4);
}
.journey__step--active .journey__marker { background: var(--color-accent); }
.journey__step:not(:last-child)::after {
  content: "";
  position: absolute;
  top: var(--space-6);
  right: calc(var(--space-5) * -1 + 6px);
  width: calc(var(--space-5) - 12px);
  height: 2px;
  background: var(--color-border-strong);
}

@media (max-width: 780px) {
  .journey { flex-direction: column; }
  .journey__step:not(:last-child)::after { display: none; }
}

/* ==========================================================================
   Pilot CTA
   ========================================================================== */
.pilot__outcomes {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-4);
  padding: 0;
  margin: var(--space-7) 0;
}
.pilot__outcomes li {
  text-align: center;
  font-weight: 600;
  font-size: var(--fs-small);
  color: #fff;
  background: rgba(255, 255, 255, 0.08);
  border: var(--border-width) solid rgba(255, 255, 255, 0.18);
  border-radius: var(--radius-md);
  padding: var(--space-5) var(--space-3);
}

.pilot__content {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(260px, 0.7fr);
  gap: var(--space-6);
  align-items: stretch;
}

.pilot__content .pilot__outcomes { margin: 0; }

.pilot__actions {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: var(--space-5);
  border-left: var(--border-width) solid rgba(255, 255, 255, 0.24);
}

.pilot__actions p {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--fs-small);
  margin-bottom: var(--space-4);
}

.pilot__actions .center-cta { justify-content: flex-start; margin-top: 0; }

@media (max-width: 780px) {
  .pilot__outcomes { grid-template-columns: repeat(2, 1fr); }
  .pilot__content { grid-template-columns: 1fr; }
  .pilot__actions { border-left: 0; border-top: var(--border-width) solid rgba(255, 255, 255, 0.24); }
}

/* ==========================================================================
   Contact form
   ========================================================================== */
.contact-form {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  box-shadow: var(--shadow-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
}

.form-trap {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.request-type {
  border: 0;
  padding: 0 0 var(--space-5);
  margin: 0;
  border-bottom: var(--border-width) solid var(--color-border);
}

.request-type legend {
  font-size: var(--fs-body);
  font-weight: 700;
  color: var(--color-ink);
  margin-bottom: var(--space-3);
}

.request-type__options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-3);
}

.request-type__option {
  position: relative;
  display: flex;
  gap: var(--space-3);
  align-items: flex-start;
  padding: var(--space-4);
  border: var(--border-width) solid var(--color-border-strong);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: border-color var(--transition-fast), background-color var(--transition-fast), box-shadow var(--transition-fast);
}

.request-type__option:has(input:checked) {
  border-color: var(--color-accent);
  background: var(--color-accent-tint);
  box-shadow: 0 0 0 1px var(--color-accent);
}

.request-type__option input { margin-top: 0.2rem; accent-color: var(--color-accent); }
.request-type__option span { display: flex; flex-direction: column; gap: var(--space-1); }
.request-type__option strong { color: var(--color-ink); font-size: var(--fs-small); }
.request-type__option small { color: var(--color-muted); line-height: var(--lh-snug); }
.request-type__help { margin: var(--space-3) 0 0; color: var(--color-muted); font-size: var(--fs-label); }

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-5);
}

.form-field { display: flex; flex-direction: column; gap: var(--space-2); }
.form-field label,
.form-field legend {
  font-weight: 600;
  font-size: var(--fs-small);
  color: var(--color-ink);
  padding: 0;
}

.form-field input[type="text"],
.form-field input[type="email"],
.form-field select,
.form-field textarea {
  font: inherit;
  padding: 0.7rem 0.9rem;
  border: var(--border-width) solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  border-color: var(--color-accent);
}
.form-field textarea { resize: vertical; min-height: 100px; }

.form-field input[aria-invalid="true"],
.form-field select[aria-invalid="true"] {
  border-color: #b3261e;
}

.form-error {
  font-size: var(--fs-label);
  color: #b3261e;
  min-height: 1em;
}

.checkbox-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(210px, 1fr));
  gap: var(--space-2) var(--space-4);
}

.checkbox-option {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 400;
  font-size: var(--fs-small);
  color: var(--color-body);
}
.checkbox-option input { width: 16px; height: 16px; accent-color: var(--color-accent); }

fieldset.form-field {
  border: none;
  padding: 0;
  margin: 0;
}

.form-submit { display: flex; align-items: center; gap: var(--space-4); flex-wrap: wrap; }
.form-submit--split { justify-content: space-between; }
.form-status { font-size: var(--fs-small); font-weight: 600; margin: 0; }
.form-status--success { color: var(--color-status-stable); }
.form-status--error { color: #b3261e; }

.extended-fields {
  display: flex;
  flex-direction: column;
  gap: var(--space-5);
  padding-top: var(--space-5);
  border-top: var(--border-width) solid var(--color-border);
}
.extended-fields[hidden] { display: none; }

@media (max-width: 600px) {
  .request-type__options { grid-template-columns: 1fr; }
}

/* ==========================================================================
   Footer
   ========================================================================== */
.site-footer {
  background: var(--color-brand-dark);
  color: rgba(255,255,255,0.85);
  padding-block: var(--space-7) var(--space-5);
}

.footer__grid {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: var(--space-6);
  margin-bottom: var(--space-6);
}

.footer__brand { font-weight: 700; color: #fff; font-size: 1.1rem; margin-bottom: var(--space-2); }
.footer__description { max-width: 42ch; }

.footer__nav { display: flex; flex-wrap: wrap; gap: var(--space-4) var(--space-5); align-content: start; }
.footer__nav a { color: rgba(255,255,255,0.85); text-decoration: none; font-size: var(--fs-small); }
.footer__nav a:hover { color: #fff; text-decoration: underline; }

.footer__disclaimer {
  border-top: var(--border-width) solid rgba(255,255,255,0.15);
  padding-top: var(--space-5);
  font-size: var(--fs-label);
  color: rgba(255,255,255,0.65);
}

/* ==========================================================================
   Responsive breakpoints
   ========================================================================== */
@media (max-width: 960px) {
  .hero__grid { grid-template-columns: 1fr; }
  .hero__visual { order: -1; }
  .platform-split,
  .responsible-split { grid-template-columns: 1fr; }
  .platform-split__text { position: static; }
  .problem-grid { grid-template-columns: repeat(2, 1fr); }
  .problem-card--featured { grid-column: span 2; }
  .difference__grid { grid-template-columns: 1fr; }
}

@media (max-width: 800px) {
  .navbar__toggle { display: flex; }

  .navbar__menu {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-surface);
    border-bottom: var(--border-width) solid var(--color-border);
    flex-direction: column;
    align-items: stretch;
    padding: var(--space-5);
    gap: var(--space-5);
    display: none;
    box-shadow: var(--shadow-md);
  }
  .navbar__menu.is-open { display: flex; }

  .navbar__links {
    flex-direction: column;
    gap: var(--space-3);
  }

  .navbar__cta { align-self: flex-start; }
}

@media (max-width: 620px) {
  .form-row { grid-template-columns: 1fr; }
  .section { padding-block: var(--space-7); }
  .problem-grid { grid-template-columns: 1fr; }
  .problem-card--featured { grid-column: span 1; }
  .pilot__outcomes { grid-template-columns: 1fr; }
  .interop-diagram__arrow { display: none; }
  .form-submit--split { flex-direction: column; align-items: flex-start; }
}