:root {
  --navy: #0b132b;
  --midnight: #15233f;
  --aqua: #2ec4b6;
  --coral: #ff6b6b;
  --ivory: #f7f4ea;
  --slate: #a8b2c3;
  --white: #ffffff;

  --text: #1f2a44;
  --muted: #667085;
  --border: #dde3ec;
  --surface: #ffffff;
  --surface-soft: #f8fafc;
  --surface-warm: #fbfaf5;

  --shadow-sm: 0 10px 30px rgba(11, 19, 43, 0.08);
  --shadow-md: 0 20px 50px rgba(11, 19, 43, 0.12);

  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 28px;

  --container: 1180px;

  --transition: 180ms ease;
}

/* ==================================================
   RESET
================================================== */

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

html {
  scroll-behavior: smooth;
  scroll-padding-top: 90px;
}

body {
  margin: 0;
  font-family:
    Inter,
    ui-sans-serif,
    system-ui,
    -apple-system,
    BlinkMacSystemFont,
    "Segoe UI",
    sans-serif;
  color: var(--text);
  background: var(--white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

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

button,
input,
textarea,
select {
  font: inherit;
}

button {
  cursor: pointer;
}

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

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

::selection {
  background: rgba(46, 196, 182, 0.25);
  color: var(--navy);
}

/* ==================================================
   ACCESSIBILITY
================================================== */

.skip-link {
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 9999;
  padding: 12px 16px;
  border-radius: 10px;
  color: var(--white);
  background: var(--navy);
  transform: translateY(-160%);
  transition: transform var(--transition);
}

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

:focus-visible {
  outline: 3px solid var(--coral);
  outline-offset: 4px;
}

/* ==================================================
   GLOBAL
================================================== */

.container {
  width: min(calc(100% - 40px), var(--container));
  margin-inline: auto;
}

.section {
  padding: 100px 0;
}

.eyebrow {
  margin-bottom: 18px;
  color: var(--aqua);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-heading {
  max-width: 760px;
  margin-bottom: 54px;
}

.section-heading h2,
.framework-content h2,
.about-copy h2 {
  margin-bottom: 20px;
  color: var(--navy);
  font-size: clamp(2.25rem, 4vw, 4.2rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.section-heading h2 span,
.framework-content h2 span,
.about-copy h2 span {
  color: var(--aqua);
}

.section-heading > p:last-child,
.framework-intro,
.about-copy > p:last-child {
  max-width: 700px;
  color: var(--muted);
  font-size: 1.05rem;
}

/* ==================================================
   BUTTONS
================================================== */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: 0 22px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-weight: 750;
  transition:
    transform var(--transition),
    background-color var(--transition),
    border-color var(--transition),
    color var(--transition);
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  color: var(--navy);
  background: var(--aqua);
}

.button-primary:hover {
  background: #25b0a4;
}

.button-secondary {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.28);
  background: transparent;
}

.button-secondary:hover {
  border-color: rgba(255, 255, 255, 0.7);
  background: rgba(255, 255, 255, 0.06);
}

.button-small {
  min-height: 42px;
  padding-inline: 18px;
  color: var(--white);
  background: var(--navy);
}

/* ==================================================
   HEADER
================================================== */

.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(11, 19, 43, 0.08);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(14px);
}

.header-inner {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  min-height: 76px;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
}

.brand-logo {
  width: 295px;
  max-width: 100%;
}

.primary-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 26px;
}

.primary-nav a,
.footer-nav a {
  color: #526078;
  font-size: 0.94rem;
  font-weight: 700;
  transition: color var(--transition);
}

.primary-nav a:hover,
.footer-nav a:hover {
  color: var(--aqua);
}

.menu-toggle {
  display: none;
  width: 46px;
  height: 46px;
  padding: 10px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--white);
}

.menu-line {
  display: block;
  width: 100%;
  height: 2px;
  margin: 5px 0;
  border-radius: 999px;
  background: var(--navy);
  transition:
    transform var(--transition),
    opacity var(--transition);
}

/* ==================================================
   HERO
================================================== */

.hero {
  position: relative;
  overflow: hidden;
  padding: 110px 0 96px;
  color: var(--white);
  background:
    linear-gradient(
      rgba(255, 255, 255, 0.018) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.018) 1px,
      transparent 1px
    ),
    var(--navy);
  background-size: 38px 38px;
}

.hero::before {
  content: "";
  position: absolute;
  top: -180px;
  right: -100px;
  width: 520px;
  height: 520px;
  border: 1px solid rgba(46, 196, 182, 0.14);
  border-radius: 50%;
}

.hero::after {
  content: "";
  position: absolute;
  right: 12%;
  bottom: -190px;
  width: 380px;
  height: 380px;
  border: 1px solid rgba(255, 107, 107, 0.12);
  border-radius: 50%;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: minmax(0, 1.02fr) minmax(430px, 0.98fr);
  align-items: center;
  gap: 78px;
}

.hero-content {
  max-width: 690px;
}

.hero-content .eyebrow {
  color: var(--aqua);
}

.hero h1 {
  margin-bottom: 26px;
  color: var(--white);
  font-size: clamp(3rem, 5.3vw, 6rem);
  line-height: 0.97;
  letter-spacing: -0.055em;
}

.hero h1 span {
  color: var(--aqua);
}

.hero-description {
  max-width: 640px;
  margin-bottom: 34px;
  color: #c8d0dd;
  font-size: 1.13rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.hero-note {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 30px;
  color: #aeb8c8;
  font-size: 0.9rem;
}

.status-dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--aqua);
  box-shadow: 0 0 0 6px rgba(46, 196, 182, 0.12);
}

/* ==================================================
   HERO VISUAL
================================================== */

.hero-visual {
  min-width: 0;
}

.signal-panel {
  position: relative;
  overflow: hidden;
  min-height: 560px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(
      rgba(255, 255, 255, 0.025) 1px,
      transparent 1px
    ),
    linear-gradient(
      90deg,
      rgba(255, 255, 255, 0.025) 1px,
      transparent 1px
    ),
    var(--midnight);
  background-size: 28px 28px;
  box-shadow: var(--shadow-md);
}

.panel-heading,
.signal-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 18px 20px;
  color: #b9c3d3;
  font-size: 0.78rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.panel-heading {
  border-bottom: 1px solid rgba(255, 255, 255, 0.09);
}

.panel-status {
  padding: 7px 10px;
  border: 1px solid rgba(46, 196, 182, 0.25);
  border-radius: 999px;
  color: var(--aqua);
  background: rgba(46, 196, 182, 0.08);
}

.signal-stage {
  position: relative;
  min-height: 430px;
}

.signal-mark {
  position: absolute;
  top: 50%;
  left: 50%;
  z-index: 4;
  width: 118px;
  transform: translate(-50%, -50%);
  filter: drop-shadow(0 18px 30px rgba(0, 0, 0, 0.22));
}

.signal-orbit {
  position: absolute;
  top: 50%;
  left: 50%;
  border: 1px solid rgba(46, 196, 182, 0.2);
  border-radius: 50%;
  transform: translate(-50%, -50%);
}

.orbit-one {
  width: 280px;
  height: 280px;
}

.orbit-two {
  width: 390px;
  height: 390px;
  border-color: rgba(255, 107, 107, 0.13);
}

.signal-node {
  position: absolute;
  z-index: 5;
  width: 150px;
  padding: 14px;
  border: 1px solid rgba(255, 255, 255, 0.13);
  border-radius: 16px;
  background: rgba(11, 19, 43, 0.8);
  box-shadow: 0 14px 30px rgba(0, 0, 0, 0.2);
}

.signal-node strong,
.signal-node small {
  display: block;
}

.signal-node strong {
  margin: 3px 0 2px;
  color: var(--white);
  font-size: 0.94rem;
}

.signal-node small {
  color: #aab4c4;
  font-size: 0.75rem;
}

.node-number {
  color: var(--aqua);
  font-size: 0.72rem;
  font-weight: 800;
}

.node-observe {
  top: 42px;
  left: 34px;
}

.node-detect {
  top: 52px;
  right: 30px;
}

.node-interpret {
  right: 28px;
  bottom: 42px;
}

.node-validate {
  left: 28px;
  bottom: 42px;
}

.signal-footer {
  justify-content: center;
  border-top: 1px solid rgba(255, 255, 255, 0.09);
}

.signal-line {
  width: 30px;
  height: 1px;
  background: rgba(255, 255, 255, 0.2);
}

/* ==================================================
   STATS
================================================== */

.stats-section {
  border-bottom: 1px solid var(--border);
  background: var(--surface-warm);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}

.stat-item {
  padding: 32px 28px;
  border-right: 1px solid var(--border);
}

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

.stat-item strong,
.stat-item span {
  display: block;
}

.stat-item strong {
  margin-bottom: 7px;
  color: var(--navy);
  font-size: 2.1rem;
  line-height: 1;
}

.stat-item span {
  color: var(--muted);
  font-size: 0.92rem;
}

/* ==================================================
   FIELDS
================================================== */

.fields-section {
  background: var(--white);
}

.fields-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px;
}

.field-card {
  position: relative;
  overflow: hidden;
  padding: 32px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--surface);
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
}

.field-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background: var(--aqua);
  opacity: 0;
  transition: opacity var(--transition);
}

.field-card:hover {
  transform: translateY(-5px);
  border-color: #c9d2df;
  box-shadow: var(--shadow-sm);
}

.field-card:hover::before {
  opacity: 1;
}

.field-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 26px;
}

.field-number {
  color: var(--coral);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.1em;
}

.field-symbol {
  display: grid;
  width: 42px;
  height: 42px;
  place-items: center;
  border: 1px solid rgba(46, 196, 182, 0.22);
  border-radius: 12px;
  color: var(--aqua);
  background: rgba(46, 196, 182, 0.07);
  font-size: 1.15rem;
}

.field-card h3 {
  margin-bottom: 12px;
  color: var(--navy);
  font-size: 1.45rem;
}

.field-card > p {
  margin-bottom: 22px;
  color: var(--muted);
}

.topic-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
}

.topic-list li {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: #5e6878;
  background: var(--surface-soft);
  font-size: 0.78rem;
}

/* ==================================================
   FRAMEWORK
================================================== */

.framework-section {
  color: var(--white);
  background: var(--navy);
}

.framework-layout {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  align-items: start;
  gap: 80px;
}

.framework-content h2 {
  color: var(--white);
}

.framework-content .framework-intro {
  color: #b9c2d0;
}

.framework-checklist {
  display: grid;
  gap: 12px;
  margin-top: 34px;
}

.check-item {
  display: flex;
  align-items: center;
  gap: 12px;
}

.check-item span {
  display: grid;
  flex: 0 0 28px;
  width: 28px;
  height: 28px;
  place-items: center;
  border-radius: 50%;
  color: var(--navy);
  background: var(--aqua);
  font-size: 0.8rem;
  font-weight: 900;
}

.check-item p {
  margin: 0;
  color: #d3dae4;
}

.framework-steps {
  display: grid;
  gap: 16px;
}

.method-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 20px;
  padding: 24px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.035);
  transition:
    transform var(--transition),
    border-color var(--transition),
    background-color var(--transition);
}

.method-card:hover {
  transform: translateX(6px);
  border-color: rgba(46, 196, 182, 0.42);
  background: rgba(46, 196, 182, 0.055);
}

.method-number {
  display: grid;
  width: 46px;
  height: 46px;
  place-items: center;
  border-radius: 14px;
  color: var(--navy);
  background: var(--aqua);
  font-size: 0.78rem;
  font-weight: 900;
}

.method-card h3 {
  margin-bottom: 5px;
  color: var(--white);
  font-size: 1.2rem;
}

.method-card p {
  margin: 0;
  color: #b7c0ce;
}

/* ==================================================
   RESEARCHERS
================================================== */

.researchers-section {
  background: var(--surface-soft);
}

.researcher-heading {
  max-width: 850px;
}

.researchers-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.researcher-card {
  display: flex;
  min-width: 0;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--white);
  box-shadow: 0 8px 20px rgba(11, 19, 43, 0.04);
  transition:
    transform var(--transition),
    box-shadow var(--transition);
}

.researcher-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-sm);
}

.researcher-header {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.researcher-avatar {
  display: grid;
  flex: 0 0 52px;
  width: 52px;
  height: 52px;
  place-items: center;
  border-radius: 16px;
  color: var(--white);
  background: var(--navy);
  font-size: 0.93rem;
  font-weight: 900;
  letter-spacing: 0.04em;
}

.researcher-country {
  display: block;
  margin-bottom: 3px;
  color: var(--coral);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.researcher-card h3 {
  margin: 0;
  color: var(--navy);
  font-size: 1.25rem;
  line-height: 1.2;
}

.institution {
  min-height: 48px;
  margin-bottom: 14px;
  color: #43516a;
  font-size: 0.92rem;
  font-weight: 750;
}

.research-summary {
  flex: 1;
  margin-bottom: 18px;
  color: var(--muted);
  font-size: 0.92rem;
}

.research-meta {
  margin-bottom: 16px;
}

.research-meta a {
  color: #148b82;
  font-size: 0.84rem;
  font-weight: 800;
}

.research-meta a:hover {
  text-decoration: underline;
}

.research-tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  margin-top: auto;
}

.research-tag-list span {
  padding: 7px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: #596579;
  background: var(--surface-soft);
  font-size: 0.74rem;
}

/* ==================================================
   DEMO ALIAS
================================================== */

.alias-box {
  margin-top: auto;
  padding: 14px;
  border: 1px dashed #ccd5e1;
  border-radius: 14px;
  background: #fbfcfe;
}

.alias-label {
  display: block;
  margin-bottom: 7px;
  color: #7a8495;
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: 0.07em;
  text-transform: uppercase;
}

.alias-row {
  display: flex;
  align-items: center;
  gap: 8px;
}

.alias-value {
  min-width: 0;
  overflow: hidden;
  flex: 1;
  color: var(--navy);
  font-family:
    "SFMono-Regular",
    Consolas,
    "Liberation Mono",
    monospace;
  font-size: 0.74rem;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.copy-alias {
  flex: 0 0 auto;
  padding: 7px 9px;
  border: 1px solid var(--border);
  border-radius: 9px;
  color: var(--navy);
  background: var(--white);
  font-size: 0.72rem;
  font-weight: 800;
  transition:
    color var(--transition),
    border-color var(--transition),
    background-color var(--transition);
}

.copy-alias:hover {
  color: #126c66;
  border-color: rgba(46, 196, 182, 0.5);
  background: rgba(46, 196, 182, 0.07);
}

.copy-status {
  display: block;
  min-height: 18px;
  margin-top: 6px;
  color: #178378;
  font-size: 0.7rem;
}

/* ==================================================
   LIBRARY
================================================== */

.library-section {
  background: var(--white);
}

.library-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.library-card {
  display: flex;
  min-height: 260px;
  flex-direction: column;
  padding: 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--white);
  transition:
    transform var(--transition),
    box-shadow var(--transition),
    border-color var(--transition);
}

.library-card:hover {
  transform: translateY(-5px);
  border-color: #cbd4e0;
  box-shadow: var(--shadow-sm);
}

.library-category {
  display: inline-flex;
  align-self: flex-start;
  margin-bottom: 26px;
  padding: 6px 9px;
  border-radius: 999px;
  color: #137f77;
  background: rgba(46, 196, 182, 0.09);
  font-size: 0.7rem;
  font-weight: 850;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.library-card h3 {
  margin-bottom: 12px;
  color: var(--navy);
  font-size: 1.3rem;
  line-height: 1.2;
}

.library-card p {
  margin-bottom: 24px;
  color: var(--muted);
  font-size: 0.92rem;
}

.library-card a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: auto;
  color: var(--navy);
  font-size: 0.86rem;
  font-weight: 850;
}

.library-card a span {
  color: var(--coral);
  transition: transform var(--transition);
}

.library-card a:hover span {
  transform: translateX(4px);
}

/* ==================================================
   ABOUT
================================================== */

.about-section {
  border-top: 1px solid var(--border);
  background: var(--surface-warm);
}

.about-grid {
  display: grid;
  grid-template-columns: 0.82fr 1.18fr;
  gap: 70px;
}

.principles-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
}

.principle-card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--white);
}

.principle-number {
  display: inline-block;
  margin-bottom: 30px;
  color: var(--coral);
  font-size: 0.75rem;
  font-weight: 900;
}

.principle-card h3 {
  margin-bottom: 10px;
  color: var(--navy);
  font-size: 1.05rem;
}

.principle-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.disclaimer {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 22px;
  margin-top: 54px;
  padding: 22px 24px;
  border-left: 4px solid var(--coral);
  border-radius: 0 14px 14px 0;
  background: rgba(255, 107, 107, 0.055);
}

.disclaimer strong {
  color: var(--navy);
  white-space: nowrap;
}

.disclaimer p {
  margin: 0;
  color: #667085;
}

/* ==================================================
   FOOTER
================================================== */

.site-footer {
  padding: 36px 0 18px;
  color: #c6cfdb;
  background: var(--navy);
}

.footer-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 30px;
  padding-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 13px;
}

.footer-mark {
  width: 46px;
  height: 46px;
}

.footer-brand strong {
  display: block;
  color: var(--white);
}

.footer-brand p {
  margin: 2px 0 0;
  color: #9ba7b8;
  font-size: 0.83rem;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}

.footer-nav a {
  color: #b7c1d0;
}

.footer-bottom {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 18px;
  color: #7f8ca0;
  font-size: 0.78rem;
}

.footer-bottom p {
  margin: 0;
}

.footer-bottom a {
  color: #aeb9c8;
}

/* ==================================================
   REVEAL
================================================== */

.reveal {
  opacity: 1;
  transform: none;
}

.js-enabled .reveal {
  opacity: 0;
  transform: translateY(18px);
  transition:
    opacity 600ms ease,
    transform 600ms ease;
}

.js-enabled .reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

/* ==================================================
   RESPONSIVE
================================================== */

@media (max-width: 1100px) {
  .brand-logo {
    width: 245px;
  }

  .primary-nav {
    gap: 18px;
  }

  .hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 44px;
  }

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

  .about-grid {
    grid-template-columns: 1fr;
    gap: 45px;
  }
}

@media (max-width: 920px) {
  .section {
    padding: 78px 0;
  }

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

  .brand-logo {
    width: 260px;
  }

  .menu-toggle {
    display: block;
  }

  .header-cta {
    display: none;
  }

  .primary-nav {
    position: absolute;
    top: calc(100% + 1px);
    right: 20px;
    left: 20px;
    display: none;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    overflow: hidden;
    border: 1px solid var(--border);
    border-radius: 18px;
    background: var(--white);
    box-shadow: var(--shadow-md);
  }

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

  .primary-nav a {
    padding: 15px 18px;
    border-bottom: 1px solid var(--border);
  }

  .primary-nav a:last-child {
    border-bottom: 0;
  }

  .menu-toggle.is-open .menu-line:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }

  .menu-toggle.is-open .menu-line:nth-child(2) {
    opacity: 0;
  }

  .menu-toggle.is-open .menu-line:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }

  .hero {
    padding-top: 82px;
  }

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

  .hero-content {
    max-width: 760px;
  }

  .signal-panel {
    min-height: 520px;
  }

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

  .stat-item:nth-child(2) {
    border-right: 0;
  }

  .stat-item:nth-child(-n + 2) {
    border-bottom: 1px solid var(--border);
  }

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

  .framework-layout {
    grid-template-columns: 1fr;
    gap: 48px;
  }

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

@media (max-width: 680px) {
  .container {
    width: min(calc(100% - 28px), var(--container));
  }

  .section {
    padding: 66px 0;
  }

  .brand-logo {
    width: 220px;
  }

  .hero {
    padding: 70px 0 68px;
  }

  .hero h1 {
    font-size: clamp(2.7rem, 13vw, 4.3rem);
  }

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

  .hero-actions .button {
    width: 100%;
  }

  .signal-panel {
    min-height: 500px;
  }

  .signal-stage {
    min-height: 385px;
  }

  .signal-mark {
    width: 92px;
  }

  .orbit-one {
    width: 220px;
    height: 220px;
  }

  .orbit-two {
    width: 310px;
    height: 310px;
  }

  .signal-node {
    width: 132px;
    padding: 11px;
  }

  .node-observe {
    top: 34px;
    left: 14px;
  }

  .node-detect {
    top: 44px;
    right: 14px;
  }

  .node-interpret {
    right: 14px;
    bottom: 32px;
  }

  .node-validate {
    left: 14px;
    bottom: 32px;
  }

  .signal-footer {
    gap: 8px;
    font-size: 0.67rem;
  }

  .signal-line {
    width: 15px;
  }

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

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

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

  .researchers-grid,
  .library-grid {
    grid-template-columns: 1fr;
  }

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

  .footer-main,
  .footer-bottom {
    align-items: flex-start;
    flex-direction: column;
  }

  .footer-nav {
    gap: 16px;
  }
}

@media (max-width: 460px) {
  .brand-logo {
    width: 190px;
  }

  .signal-panel {
    min-height: 560px;
  }

  .signal-stage {
    min-height: 440px;
  }

  .signal-node {
    width: 118px;
  }

  .node-observe,
  .node-validate {
    left: 8px;
  }

  .node-detect,
  .node-interpret {
    right: 8px;
  }

  .alias-row {
    align-items: stretch;
    flex-direction: column;
  }

  .alias-value {
    white-space: normal;
    overflow-wrap: anywhere;
  }

  .copy-alias {
    align-self: flex-start;
  }
}

/* ==================================================
   REDUCED MOTION
================================================== */

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms;
    animation-iteration-count: 1;
    transition-duration: 0.01ms;
  }

  .js-enabled .reveal {
    opacity: 1;
    transform: none;
  }
}