:root {
  --ink: #172124;
  --ink-soft: #415052;
  --paper: #f8faf7;
  --paper-warm: #fffdf8;
  --line: rgba(23, 33, 36, 0.14);
  --teal: #0f8b8d;
  --teal-dark: #075d62;
  --coral: #d96752;
  --gold: #c19a3f;
  --mist: #e8f2ef;
  --shadow: 0 24px 80px rgba(18, 35, 40, 0.16);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  line-height: 1.55;
}

a {
  color: inherit;
}

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding: 18px clamp(20px, 5vw, 64px);
  color: #fff;
  transition: background 180ms ease, box-shadow 180ms ease, color 180ms ease;
}

.site-header.is-scrolled,
.site-header.is-open {
  color: var(--ink);
  background: rgba(248, 250, 247, 0.92);
  box-shadow: 0 12px 40px rgba(16, 32, 35, 0.08);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 750;
  letter-spacing: 0;
  text-decoration: none;
}

.brand-mark {
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background:
    linear-gradient(90deg, var(--coral), transparent 65%),
    radial-gradient(circle at 70% 40%, #fff 0 18%, var(--teal) 19% 100%);
  box-shadow: 0 0 0 4px rgba(255, 255, 255, 0.18);
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 8px;
}

.site-nav a {
  padding: 10px 12px;
  border-radius: 999px;
  text-decoration: none;
  font-size: 0.93rem;
  font-weight: 650;
}

.site-nav a:hover {
  background: rgba(255, 255, 255, 0.14);
}

.site-header.is-scrolled .site-nav a:hover,
.site-header.is-open .site-nav a:hover {
  background: rgba(15, 139, 141, 0.1);
}

.nav-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border: 1px solid currentColor;
  border-radius: 999px;
  color: inherit;
  background: transparent;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  margin: 4px auto;
  background: currentColor;
}

.hero {
  position: relative;
  min-height: 94vh;
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(280px, 410px);
  align-items: end;
  gap: 28px;
  padding: 132px clamp(20px, 5vw, 72px) 42px;
  overflow: hidden;
  color: #fff;
}

.hero-image,
.hero-scrim {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
}

.hero-image {
  object-fit: cover;
}

.hero-scrim {
  background:
    linear-gradient(90deg, rgba(12, 20, 22, 0.88) 0%, rgba(12, 20, 22, 0.64) 38%, rgba(12, 20, 22, 0.12) 100%),
    linear-gradient(0deg, rgba(12, 20, 22, 0.64) 0%, rgba(12, 20, 22, 0.12) 45%, rgba(12, 20, 22, 0.32) 100%);
}

.hero-content,
.hero-panel {
  position: relative;
  z-index: 1;
}

.eyebrow,
.section-kicker,
.resource-type {
  margin: 0 0 14px;
  color: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.hero .eyebrow {
  color: #8fe5df;
}

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

h1 {
  max-width: 850px;
  margin-bottom: 22px;
  font-size: clamp(3.2rem, 7vw, 6.8rem);
  line-height: 0.95;
  letter-spacing: 0;
}

h2 {
  margin-bottom: 18px;
  font-size: clamp(2rem, 4vw, 4.1rem);
  line-height: 1.02;
  letter-spacing: 0;
}

h3 {
  margin-bottom: 10px;
  font-size: 1.2rem;
  line-height: 1.2;
}

.hero-copy {
  max-width: 650px;
  color: rgba(255, 255, 255, 0.84);
  font-size: clamp(1.04rem, 1.6vw, 1.25rem);
}

.hero-actions,
.feature-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 13px 18px;
  border: 1px solid transparent;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 760;
}

.button.primary {
  color: #fff;
  background: var(--coral);
}

.button.ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, 0.46);
  background: rgba(255, 255, 255, 0.08);
}

.button.secondary {
  color: var(--teal-dark);
  border-color: rgba(15, 139, 141, 0.22);
  background: #fff;
}

.hero-panel {
  display: grid;
  gap: 16px;
  align-self: end;
  padding: 20px;
  border: 1px solid rgba(255, 255, 255, 0.22);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.12);
  backdrop-filter: blur(18px);
}

.hero-panel p,
.site-footer p {
  margin-bottom: 0;
}

.metric {
  display: block;
  margin-bottom: 4px;
  color: #fff;
  font-size: 1.55rem;
  font-weight: 820;
}

.section {
  padding: clamp(72px, 9vw, 128px) clamp(20px, 5vw, 72px);
  scroll-margin-top: 84px;
}

.split,
.section-heading {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(280px, 0.95fr);
  gap: clamp(28px, 6vw, 82px);
  align-items: start;
}

.lead-stack {
  color: var(--ink-soft);
  font-size: 1.08rem;
}

.info-grid,
.resource-grid,
.reference-links {
  display: grid;
  gap: 18px;
}

.info-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 56px;
}

.info-grid article,
.resource-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.72);
  box-shadow: 0 8px 26px rgba(24, 38, 42, 0.06);
}

.info-grid article {
  padding: 24px;
}

.patterns {
  background: var(--paper-warm);
}

.pattern-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 18px;
  margin-top: 52px;
}

.pattern-stats article {
  min-height: 260px;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  padding: 26px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 8px 26px rgba(24, 38, 42, 0.06);
}

.stat-number {
  display: block;
  margin-bottom: 34px;
  color: var(--coral);
  font-size: clamp(2.6rem, 5vw, 4.3rem);
  line-height: 0.95;
  font-weight: 860;
}

.pattern-stats p,
.pattern-note p {
  color: var(--ink-soft);
}

.pattern-note {
  display: grid;
  grid-template-columns: minmax(220px, 0.5fr) minmax(280px, 1fr);
  gap: clamp(22px, 5vw, 60px);
  align-items: start;
  margin-top: 28px;
  padding: 28px;
  border-left: 5px solid var(--teal);
  background: var(--mist);
}

.pattern-note h3 {
  margin-bottom: 0;
  font-size: clamp(1.45rem, 2.5vw, 2rem);
}

.pattern-links {
  grid-column: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.pattern-links a {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  padding: 9px 12px;
  border: 1px solid rgba(15, 139, 141, 0.24);
  border-radius: 8px;
  color: var(--teal-dark);
  background: rgba(255, 255, 255, 0.72);
  font-size: 0.92rem;
  font-weight: 760;
  text-decoration: none;
}

.card-icon {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  margin-bottom: 18px;
  border-radius: 50%;
  color: #fff;
  background: var(--teal);
  font-size: 0.78rem;
  font-weight: 800;
}

.feature-band {
  display: grid;
  grid-template-columns: minmax(280px, 0.82fr) minmax(320px, 1.18fr);
  gap: clamp(28px, 5vw, 72px);
  align-items: center;
  background: var(--mist);
}

.feature-copy p,
.therapy .split p,
.section-heading p,
.references p,
.resource-card p,
.info-grid p,
.timeline p,
.assistant-band p {
  color: var(--ink-soft);
}

.video-frame {
  position: relative;
  overflow: hidden;
  border: 1px solid rgba(23, 33, 36, 0.12);
  border-radius: 8px;
  box-shadow: var(--shadow);
  background: #101719;
  aspect-ratio: 16 / 9;
}

.video-frame iframe {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  border: 0;
}

.therapy {
  background: var(--paper-warm);
}

.timeline {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 0;
  margin-top: 52px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.timeline-item {
  padding: 30px 26px;
  border-right: 1px solid var(--line);
}

.timeline-item:last-child {
  border-right: 0;
}

.timeline-item span {
  display: block;
  margin-bottom: 18px;
  color: var(--coral);
  font-weight: 850;
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.resource-section {
  background: #eef3f1;
}

.resource-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 42px;
}

.resource-card {
  position: relative;
  min-height: 310px;
  display: flex;
  flex-direction: column;
  padding: 24px;
  overflow: hidden;
}

.resource-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto;
  height: 5px;
  background: var(--accent, var(--teal));
}

.resource-card a {
  margin-top: auto;
  color: var(--teal-dark);
  font-weight: 800;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.accent-coral {
  --accent: var(--coral);
}

.accent-teal {
  --accent: var(--teal);
}

.accent-gold {
  --accent: var(--gold);
}

.accent-ink {
  --accent: var(--ink);
}

.assistant-band {
  display: grid;
  grid-template-columns: minmax(280px, 0.78fr) minmax(320px, 1.22fr);
  gap: clamp(28px, 6vw, 72px);
  align-items: stretch;
  background:
    radial-gradient(circle at 12% 18%, rgba(15, 139, 141, 0.32), transparent 30%),
    linear-gradient(135deg, #111b1d 0%, #172124 58%, #203135 100%);
  color: #fff;
}

.assistant-band .section-kicker,
.assistant-band p {
  color: rgba(255, 255, 255, 0.76);
}

.assistant-copy {
  align-self: center;
}

.assistant-launch-panel {
  width: 100%;
  max-width: 560px;
  min-height: 470px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  justify-content: center;
  gap: 16px;
  justify-self: center;
  padding: clamp(28px, 5vw, 54px);
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: 8px;
  color: var(--ink);
  background: #fff;
  box-shadow: 0 30px 100px rgba(0, 0, 0, 0.24);
}

.assistant-launch-panel h3 {
  max-width: 360px;
  margin-bottom: 0;
  font-size: clamp(1.7rem, 3vw, 2.45rem);
}

.assistant-launch-panel p {
  max-width: 390px;
  margin-bottom: 8px;
  color: var(--ink-soft);
}

.assistant-launch-panel .button {
  min-width: 180px;
}

.assistant-orb {
  width: 112px;
  height: 112px;
  border-radius: 50%;
  background:
    conic-gradient(from 24deg, #0f8b8d, #fff 18%, #d96752 34%, #fff 52%, #0f8b8d 68%, #d96752 86%, #0f8b8d),
    radial-gradient(circle at 38% 34%, rgba(255, 255, 255, 0.9), transparent 38%);
  box-shadow: 0 22px 70px rgba(15, 139, 141, 0.24);
}

.references {
  padding-top: 58px;
  padding-bottom: 58px;
}

.references h2 {
  font-size: clamp(1.7rem, 3vw, 2.5rem);
}

.reference-links {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 26px;
}

.reference-links a {
  min-height: 78px;
  display: flex;
  align-items: center;
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  color: var(--teal-dark);
  background: #fff;
  font-weight: 760;
  text-decoration: none;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 18px;
  padding: 28px clamp(20px, 5vw, 72px);
  color: #fff;
  background: #101719;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.site-footer a {
  font-weight: 760;
}

.build-page {
  background: var(--paper-warm);
}

.build-page .site-header {
  position: sticky;
}

.build-hero {
  padding: 150px clamp(20px, 5vw, 72px) clamp(70px, 8vw, 112px);
  color: #fff;
  background:
    linear-gradient(135deg, rgba(16, 23, 25, 0.94), rgba(25, 49, 52, 0.86)),
    url("assets/hero-egfr.jpg") center / cover;
}

.build-hero h1 {
  max-width: 980px;
  margin-bottom: 22px;
  font-size: clamp(3rem, 7vw, 6.1rem);
}

.build-hero p {
  max-width: 760px;
  color: rgba(255, 255, 255, 0.82);
  font-size: 1.15rem;
}

.workflow-steps,
.tool-grid,
.artifact-list {
  display: grid;
  gap: 18px;
}

.workflow-steps {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 48px;
}

.workflow-steps article,
.tool-card,
.artifact-list article {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: 0 8px 26px rgba(24, 38, 42, 0.06);
}

.workflow-steps article {
  padding: 24px;
}

.workflow-steps span {
  display: block;
  margin-bottom: 34px;
  color: var(--teal);
  font-weight: 850;
  letter-spacing: 0.12em;
}

.tool-section {
  background: #eef3f1;
}

.tool-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
  margin-top: 42px;
}

.tool-card {
  min-height: 360px;
  display: flex;
  flex-direction: column;
  padding: 24px;
}

.tool-card p {
  color: var(--ink-soft);
}

.tool-card a {
  margin-top: auto;
  color: var(--teal-dark);
  font-weight: 800;
  text-decoration-thickness: 2px;
  text-underline-offset: 4px;
}

.artifact-list {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 32px;
}

.artifact-list article {
  padding: 24px;
}

@media (max-width: 1020px) {
  .hero,
  .split,
  .section-heading,
  .feature-band,
  .assistant-band {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
    padding-top: 120px;
  }

  .hero-panel {
    max-width: 720px;
  }

  .info-grid,
  .pattern-stats,
  .workflow-steps,
  .artifact-list,
  .timeline,
  .reference-links {
    grid-template-columns: 1fr;
  }

  .pattern-note {
    grid-template-columns: 1fr;
  }

  .pattern-links {
    grid-column: auto;
  }

  .timeline-item {
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }

  .timeline-item:last-child {
    border-bottom: 0;
  }

  .resource-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .tool-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .site-header {
    align-items: flex-start;
    padding: 14px 18px;
  }

  .nav-toggle {
    display: block;
    flex: 0 0 auto;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 18px;
    right: 18px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    padding: 10px;
    border: 1px solid var(--line);
    border-radius: 8px;
    background: rgba(248, 250, 247, 0.98);
    color: var(--ink);
    box-shadow: 0 18px 50px rgba(15, 28, 31, 0.15);
  }

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

  .site-nav a {
    border-radius: 6px;
  }

  h1 {
    font-size: clamp(2.8rem, 15vw, 4.6rem);
  }

  h2 {
    font-size: clamp(1.9rem, 10vw, 3rem);
  }

  .hero {
    padding-left: 18px;
    padding-right: 18px;
  }

  .hero-actions,
  .feature-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

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

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

  .resource-card {
    min-height: 250px;
  }

  .site-footer {
    flex-direction: column;
  }
}