:root {
  --ink: #06101d;
  --ink-soft: #0b1a2b;
  --navy: #111744;
  --paper: #f4f1e9;
  --paper-deep: #e8e4da;
  --white: #f8fbff;
  --muted: #9baaba;
  --cyan: #4dd9f5;
  --cyan-deep: #0e8ca8;
  --amber: #f5ae33;
  --line: rgba(255, 255, 255, 0.14);
  --dark-line: rgba(6, 16, 29, 0.15);
  --radius: 1.5rem;
  --page: min(92vw, 1440px);
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html {
  scroll-behavior: smooth;
  background: var(--ink);
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: Inter, ui-sans-serif, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

body.menu-open {
  overflow: hidden;
}

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

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

button,
summary {
  cursor: pointer;
}

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

em {
  color: var(--cyan-deep);
  font-family: Georgia, "Times New Roman", serif;
  font-weight: 400;
}

.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: fixed;
  z-index: 1000;
  top: 1rem;
  left: 1rem;
  padding: 0.75rem 1rem;
  color: var(--ink);
  background: var(--white);
  border-radius: 999px;
  transform: translateY(-180%);
  transition: transform 0.2s ease;
}

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

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 4px;
}

.site-header {
  position: fixed;
  z-index: 100;
  inset: 0 0 auto;
  display: flex;
  width: 100%;
  height: 5.5rem;
  align-items: center;
  justify-content: space-between;
  padding: 0 4vw;
  color: var(--white);
  border-bottom: 1px solid transparent;
  transition: height 0.35s var(--ease), background 0.35s ease, border-color 0.35s ease;
}

.site-header.scrolled {
  height: 4.5rem;
  background: rgba(5, 15, 27, 0.88);
  border-color: var(--line);
  backdrop-filter: blur(18px);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.9rem;
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.05em;
}

.brand-name b {
  color: var(--amber);
  font-weight: 600;
}

.brand-mark {
  position: relative;
  display: grid;
  width: 2.65rem;
  aspect-ratio: 1;
  place-items: center;
  color: var(--white);
  border: 1px solid rgba(77, 217, 245, 0.55);
  border-radius: 50%;
  background: radial-gradient(circle, rgba(77, 217, 245, 0.22), transparent 62%);
}

.brand-mark::before,
.brand-mark::after {
  position: absolute;
  content: "";
  border: 1px solid rgba(77, 217, 245, 0.28);
  border-radius: 50%;
  inset: 0.28rem;
}

.brand-mark::after {
  inset: 0.55rem;
}

.brand-mark span {
  z-index: 1;
  font-size: 0.66rem;
  font-weight: 700;
  letter-spacing: 0;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(1.1rem, 2.4vw, 2.8rem);
  font-size: 0.77rem;
  letter-spacing: 0.06em;
}

.site-nav a {
  position: relative;
  opacity: 0.78;
  transition: opacity 0.2s ease;
}

.site-nav a:hover {
  opacity: 1;
}

.site-nav .nav-cta {
  padding: 0.7rem 1.15rem;
  color: var(--ink);
  background: var(--white);
  border-radius: 999px;
  opacity: 1;
}

.menu-toggle {
  display: none;
  width: 2.8rem;
  height: 2.8rem;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: transparent;
}

.menu-toggle > span:not(.sr-only) {
  display: block;
  width: 1rem;
  height: 1px;
  margin: 0.3rem auto;
  background: var(--white);
  transition: transform 0.2s ease;
}

.hero {
  position: relative;
  display: grid;
  min-height: 100svh;
  align-items: end;
  overflow: hidden;
  color: var(--white);
  background: #06111e;
}

.hero-image,
.hero-shade,
.hero-grid {
  position: absolute;
  inset: 0;
}

.hero-image {
  background-image: url("../assets/images/sonicwave-concept.jpg");
  background-position: center;
  background-size: cover;
  transform: scale(1.015);
  animation: hero-in 1.5s var(--ease) both;
}

.hero-shade {
  background:
    linear-gradient(90deg, rgba(3, 12, 22, 0.96) 0%, rgba(3, 12, 22, 0.83) 34%, rgba(3, 12, 22, 0.25) 63%, rgba(3, 12, 22, 0.15) 100%),
    linear-gradient(0deg, rgba(3, 12, 22, 0.72), transparent 46%);
}

.hero-grid {
  opacity: 0.15;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
  background-size: 7.5rem 7.5rem;
  mask-image: linear-gradient(90deg, black, transparent 64%);
}

.hero-content {
  position: relative;
  z-index: 2;
  width: min(52rem, 88vw);
  margin: 0 0 clamp(6rem, 12vh, 9rem) 6vw;
  animation: copy-in 1s 0.15s var(--ease) both;
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  margin: 0 0 1.7rem;
  color: var(--cyan);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  line-height: 1.3;
  text-transform: uppercase;
}

.eyebrow > span {
  width: 1.8rem;
  height: 1px;
  background: currentColor;
}

.eyebrow.dark {
  color: var(--cyan-deep);
}

.hero h1,
.section h2 {
  margin: 0;
  font-size: clamp(3.3rem, 7.1vw, 7.8rem);
  font-weight: 460;
  letter-spacing: -0.065em;
  line-height: 0.93;
}

.hero h1 em {
  color: var(--white);
  font-size: 0.91em;
}

.hero-copy {
  max-width: 39rem;
  margin: 2rem 0 0;
  color: rgba(248, 251, 255, 0.72);
  font-size: clamp(1rem, 1.4vw, 1.2rem);
  line-height: 1.65;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.8rem;
  margin-top: 2.2rem;
}

.button {
  display: inline-flex;
  min-height: 3.2rem;
  align-items: center;
  justify-content: center;
  gap: 1.5rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.035em;
  transition: transform 0.25s var(--ease), background 0.25s ease, color 0.25s ease;
}

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

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

.button-primary:hover {
  background: #ffc45c;
}

.button-ghost {
  color: var(--white);
  border-color: rgba(255, 255, 255, 0.36);
  background: rgba(5, 15, 27, 0.22);
  backdrop-filter: blur(10px);
}

.button-ghost:hover {
  background: rgba(255, 255, 255, 0.1);
}

.hero-note {
  margin: 1.4rem 0 0;
  color: rgba(248, 251, 255, 0.48);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
}

.hero-readout {
  position: absolute;
  z-index: 2;
  right: 4vw;
  bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 0.65rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.63rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  writing-mode: vertical-rl;
}

.hero-readout i {
  display: block;
  width: 1px;
  height: 1.5rem;
  background: rgba(255, 255, 255, 0.3);
}

.scroll-cue {
  position: absolute;
  z-index: 2;
  bottom: 2.5rem;
  left: 50%;
  display: flex;
  align-items: center;
  gap: 0.8rem;
  color: rgba(255, 255, 255, 0.58);
  font-size: 0.65rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  transform: translateX(-50%);
}

.scroll-cue i {
  position: relative;
  display: block;
  width: 2.5rem;
  height: 1px;
  overflow: hidden;
  background: rgba(255, 255, 255, 0.2);
}

.scroll-cue i::after {
  position: absolute;
  width: 50%;
  height: 100%;
  content: "";
  background: var(--cyan);
  animation: scan 2s ease-in-out infinite;
}

.section {
  position: relative;
  width: 100%;
  padding: clamp(5.5rem, 10vw, 10rem) max(4vw, calc((100vw - 1440px) / 2));
}

.section-number {
  color: rgba(6, 16, 29, 0.5);
  font-size: 0.64rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.section-number.light {
  color: rgba(255, 255, 255, 0.5);
}

.intro {
  display: grid;
  grid-template-columns: 0.42fr 1fr 0.72fr;
  gap: clamp(2rem, 5vw, 6rem);
  min-height: 78vh;
  align-items: center;
}

.intro-heading h2,
.principles h2,
.faq h2,
.contact h2 {
  font-size: clamp(3rem, 5.5vw, 6rem);
}

.intro-copy {
  align-self: end;
  padding-bottom: 0.6rem;
  color: rgba(6, 16, 29, 0.65);
}

.intro-copy .lede {
  margin: 0 0 1.5rem;
  color: var(--ink);
  font-size: clamp(1.25rem, 1.9vw, 1.8rem);
  line-height: 1.45;
}

.mixer {
  display: grid;
  grid-template-columns: minmax(0, 0.8fr) minmax(32rem, 1.2fr);
  gap: clamp(3rem, 7vw, 8rem);
  min-height: 95vh;
  align-items: center;
  color: var(--white);
  background: var(--ink);
  overflow: hidden;
}

.mixer::before {
  position: absolute;
  width: 40rem;
  height: 40rem;
  content: "";
  right: -18rem;
  bottom: -20rem;
  border: 1px solid rgba(77, 217, 245, 0.12);
  border-radius: 50%;
  box-shadow: 0 0 0 5rem rgba(77, 217, 245, 0.02), 0 0 0 10rem rgba(77, 217, 245, 0.015);
}

.mixer h2,
.system h2,
.safety h2 {
  font-size: clamp(3rem, 5vw, 5.8rem);
}

.mixer-copy > p:not(.eyebrow) {
  max-width: 35rem;
  margin: 2rem 0;
  color: var(--muted);
  line-height: 1.75;
}

.profile-tabs {
  display: inline-flex;
  padding: 0.3rem;
  border: 1px solid var(--line);
  border-radius: 999px;
}

.profile-tab {
  min-width: 5.2rem;
  padding: 0.7rem 1rem;
  color: var(--muted);
  border: 0;
  border-radius: 999px;
  background: transparent;
  font-size: 0.75rem;
  font-weight: 700;
}

.profile-tab[aria-pressed="true"] {
  color: var(--ink);
  background: var(--cyan);
}

.mixer-stage {
  position: relative;
  display: grid;
  min-height: 39rem;
  place-items: center;
  border: 1px solid var(--line);
  border-radius: 2rem;
  background:
    linear-gradient(145deg, rgba(16, 39, 61, 0.68), rgba(4, 13, 24, 0.94)),
    radial-gradient(circle at 50% 45%, rgba(77, 217, 245, 0.17), transparent 52%);
  overflow: hidden;
}

.mixer-stage::after {
  position: absolute;
  inset: 0;
  content: "";
  pointer-events: none;
  background-image: linear-gradient(rgba(255, 255, 255, 0.035) 1px, transparent 1px), linear-gradient(90deg, rgba(255, 255, 255, 0.035) 1px, transparent 1px);
  background-size: 3.5rem 3.5rem;
}

.pulse-field {
  position: absolute;
  top: 46%;
  left: 28%;
  display: grid;
  width: 17rem;
  aspect-ratio: 1;
  place-items: center;
  transform: translate(-50%, -50%);
}

.pulse-field span {
  position: absolute;
  border: 1px solid color-mix(in srgb, var(--pulse, var(--cyan)) 50%, transparent);
  border-radius: 50%;
  inset: 44%;
  animation: pulse 4s ease-out infinite;
}

.pulse-field span:nth-child(2) { animation-delay: -1s; }
.pulse-field span:nth-child(3) { animation-delay: -2s; }
.pulse-field span:nth-child(4) { animation-delay: -3s; }

.pulse-field b {
  z-index: 2;
  display: grid;
  width: 4.6rem;
  aspect-ratio: 1;
  place-items: center;
  border: 1px solid rgba(255, 255, 255, 0.25);
  border-radius: 50%;
  background: rgba(6, 16, 29, 0.65);
  box-shadow: 0 0 3rem rgba(77, 217, 245, 0.16);
  font-size: 0.9rem;
  letter-spacing: 0.08em;
}

.session-card {
  position: absolute;
  z-index: 3;
  right: 2.2rem;
  bottom: 2.2rem;
  width: min(23rem, 48%);
  padding: 1.6rem;
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 1.2rem;
  background: rgba(8, 20, 34, 0.78);
  backdrop-filter: blur(16px);
}

.session-topline {
  display: flex;
  justify-content: space-between;
  color: var(--cyan);
  font-size: 0.61rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

.session-card h3 {
  margin: 1rem 0 0.45rem;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 2.3rem;
  font-weight: 400;
}

.session-card > p {
  min-height: 4.8rem;
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.session-data {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  margin: 1.35rem 0 0;
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.session-data div {
  padding: 0.8rem;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.session-data dt {
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.58rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.session-data dd {
  margin: 0.2rem 0 0;
  font-size: 0.8rem;
}

.system {
  min-height: 100vh;
  color: var(--white);
  background: #101642;
  overflow: hidden;
}

.system::before {
  position: absolute;
  inset: 0;
  content: "";
  opacity: 0.55;
  background: radial-gradient(circle at 50% 45%, rgba(77, 217, 245, 0.13), transparent 33%), linear-gradient(130deg, transparent 0 56%, rgba(245, 174, 51, 0.06) 56% 100%);
}

.system-title,
.system-visual,
.system-caption {
  position: relative;
  z-index: 1;
}

.system-title {
  display: grid;
  grid-template-columns: 0.4fr 0.6fr 1fr;
  gap: 2rem;
  align-items: start;
}

.system-title h2 {
  grid-column: 3;
}

.system-visual {
  position: relative;
  display: grid;
  grid-template-columns: 1fr 0.52fr 1fr;
  gap: clamp(1.5rem, 4vw, 5rem);
  max-width: 72rem;
  min-height: 29rem;
  align-items: center;
  margin: 5rem auto 0;
}

.system-visual > svg {
  position: absolute;
  z-index: -1;
  inset: 50% 0 auto;
  width: 100%;
  overflow: visible;
  transform: translateY(-50%);
}

.system-visual path {
  fill: none;
  stroke: rgba(77, 217, 245, 0.28);
  stroke-dasharray: 6 10;
  stroke-width: 1;
}

.system-node {
  min-height: 17rem;
  padding: 2rem;
  border: 1px solid rgba(255, 255, 255, 0.16);
  border-radius: var(--radius);
  background: rgba(255, 255, 255, 0.045);
  backdrop-filter: blur(8px);
}

.system-node > span {
  color: var(--cyan);
  font-size: 0.64rem;
  letter-spacing: 0.15em;
}

.system-node strong {
  display: block;
  margin-top: 5rem;
  font-size: clamp(1.25rem, 2vw, 1.8rem);
  font-weight: 500;
}

.system-node small {
  display: block;
  margin-top: 0.8rem;
  color: rgba(255, 255, 255, 0.55);
  font-size: 0.8rem;
  line-height: 1.6;
}

.system-core {
  display: grid;
  aspect-ratio: 1;
  place-items: center;
  text-align: center;
}

.system-core .core-ring,
.system-core::before,
.system-core::after {
  position: absolute;
  content: "";
  border: 1px solid rgba(77, 217, 245, 0.26);
  border-radius: 50%;
  inset: 8%;
}

.system-core::before { inset: 20%; }
.system-core::after { inset: 32%; }

.system-core b {
  z-index: 1;
  margin-top: -2.2rem;
  color: var(--amber);
  font-family: Georgia, serif;
  font-size: 3rem;
  font-weight: 400;
}

.system-core small {
  position: absolute;
  z-index: 1;
  margin-top: 3rem;
  color: rgba(255, 255, 255, 0.6);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.system-caption {
  display: flex;
  max-width: 72rem;
  align-items: flex-start;
  justify-content: space-between;
  gap: 3rem;
  margin: 1rem auto 0;
  padding-top: 1.4rem;
  border-top: 1px solid var(--line);
}

.system-caption span {
  color: var(--amber);
  font-size: 0.62rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.system-caption p {
  max-width: 43rem;
  margin: 0;
  color: rgba(255, 255, 255, 0.56);
  font-size: 0.78rem;
}

.principles {
  padding-bottom: 0;
}

.principles-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 3rem;
}

.principle-list {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  margin-top: 5rem;
  border-top: 1px solid var(--dark-line);
}

.principle {
  min-height: 23rem;
  padding: 2rem clamp(1.5rem, 3vw, 3rem) 3rem 0;
  border-right: 1px solid var(--dark-line);
}

.principle + .principle {
  padding-left: clamp(1.5rem, 3vw, 3rem);
}

.principle:last-child {
  border-right: 0;
}

.principle > span {
  color: var(--cyan-deep);
  font-size: 0.65rem;
  font-weight: 700;
}

.principle h3 {
  max-width: 18rem;
  margin: 8rem 0 1rem;
  font-size: clamp(1.4rem, 2vw, 2rem);
  font-weight: 500;
  line-height: 1.15;
}

.principle p {
  max-width: 22rem;
  color: rgba(6, 16, 29, 0.58);
  font-size: 0.88rem;
  line-height: 1.7;
}

.safety {
  background: var(--paper);
}

.safety-panel {
  max-width: var(--page);
  margin: 0 auto;
  padding: clamp(2rem, 5vw, 5rem);
  color: var(--white);
  border-radius: 2rem;
  background:
    linear-gradient(125deg, rgba(5, 16, 28, 0.97), rgba(12, 31, 49, 0.91)),
    var(--ink);
  box-shadow: 0 2.5rem 6rem rgba(6, 16, 29, 0.15);
}

.safety-panel h2 {
  max-width: 62rem;
}

.safety-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  margin-top: 5rem;
  border-top: 1px solid var(--line);
}

.safety-grid > div {
  padding: 1.7rem 1.5rem 0 0;
  border-right: 1px solid var(--line);
}

.safety-grid > div + div {
  padding-left: 1.5rem;
}

.safety-grid > div:last-child {
  border-right: 0;
}

.safety-grid span {
  color: var(--amber);
  font-size: 0.62rem;
}

.safety-grid strong {
  display: block;
  margin-top: 2.8rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.safety-grid p {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.65;
}

.faq {
  display: grid;
  grid-template-columns: 0.72fr 1fr;
  gap: clamp(3rem, 8vw, 10rem);
  align-items: start;
}

.faq-head {
  position: sticky;
  top: 8rem;
}

.faq-head h2 {
  margin-top: 2rem;
}

.faq-head p {
  max-width: 30rem;
  color: rgba(6, 16, 29, 0.58);
}

.faq-list {
  border-top: 1px solid var(--dark-line);
}

.faq-list details {
  border-bottom: 1px solid var(--dark-line);
}

.faq-list summary {
  position: relative;
  display: grid;
  grid-template-columns: 3rem 1fr 2rem;
  gap: 1rem;
  align-items: center;
  padding: 1.8rem 0;
  list-style: none;
  font-size: clamp(1rem, 1.4vw, 1.25rem);
  font-weight: 550;
}

.faq-list summary::-webkit-details-marker {
  display: none;
}

.faq-list summary span {
  color: var(--cyan-deep);
  font-size: 0.62rem;
}

.faq-list summary i,
.faq-list summary i::after {
  display: block;
  width: 1rem;
  height: 1px;
  background: var(--ink);
  transition: transform 0.2s ease;
}

.faq-list summary i::after {
  content: "";
  transform: rotate(90deg);
}

.faq-list details[open] summary i::after {
  transform: rotate(0);
}

.faq-list details > p {
  max-width: 38rem;
  margin: -0.5rem 2rem 2rem 4rem;
  color: rgba(6, 16, 29, 0.6);
  line-height: 1.75;
}

.contact {
  display: grid;
  grid-template-columns: 0.82fr 1fr;
  gap: clamp(3rem, 9vw, 10rem);
  color: var(--white);
  background: var(--ink-soft);
}

.contact-copy > p:not(.eyebrow) {
  max-width: 35rem;
  color: var(--muted);
  line-height: 1.75;
}

.contact-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 2rem;
}

.contact-meta span {
  padding: 0.55rem 0.8rem;
  color: rgba(255, 255, 255, 0.68);
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.62rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.contact-form {
  padding: clamp(1.5rem, 3vw, 2.5rem);
  border: 1px solid var(--line);
  border-radius: 1.5rem;
  background: rgba(255, 255, 255, 0.035);
}

.contact-form label {
  display: block;
  margin-bottom: 1.3rem;
}

.contact-form label > span:first-child {
  display: block;
  margin-bottom: 0.5rem;
  color: rgba(255, 255, 255, 0.66);
  font-size: 0.67rem;
  font-weight: 650;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.form-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
}

.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.17);
  border-radius: 0.75rem;
  outline: 0;
  background: rgba(255, 255, 255, 0.05);
  transition: border-color 0.2s ease, background 0.2s ease;
}

.contact-form input,
.contact-form select {
  min-height: 3.15rem;
  padding: 0 0.9rem;
}

.contact-form textarea {
  min-height: 7.5rem;
  padding: 0.9rem;
  resize: vertical;
}

.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  border-color: var(--cyan);
  background: rgba(255, 255, 255, 0.08);
}

.contact-form select option {
  color: var(--ink);
}

.contact-form small[data-error],
.consent-error {
  display: block;
  min-height: 1rem;
  margin-top: 0.3rem;
  color: #ff9c82;
  font-size: 0.68rem;
}

.contact-form .consent {
  display: flex;
  align-items: flex-start;
  gap: 0.7rem;
  margin-bottom: 0;
}

.contact-form .consent input {
  width: 1rem;
  min-height: auto;
  aspect-ratio: 1;
  margin-top: 0.2rem;
  accent-color: var(--cyan);
}

.contact-form .consent span {
  color: var(--muted);
  font-size: 0.76rem;
  line-height: 1.5;
  text-transform: none;
}

.form-submit {
  width: 100%;
  margin-top: 1.2rem;
}

.form-submit:disabled {
  cursor: wait;
  opacity: 0.65;
}

.form-status {
  min-height: 1.4rem;
  margin-top: 1rem;
  color: var(--cyan);
  font-size: 0.8rem;
}

.form-status.error {
  color: #ff9c82;
}

.site-footer {
  display: grid;
  grid-template-columns: 0.7fr 1.4fr 0.8fr;
  gap: 3rem;
  align-items: end;
  padding: 3.5rem 4vw;
  color: var(--white);
  border-top: 1px solid var(--line);
  background: var(--ink);
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  font-size: 0.78rem;
  font-weight: 700;
}

.footer-brand p {
  margin: 0;
}

.footer-brand small {
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.62rem;
  font-weight: 400;
}

.footer-disclaimer {
  margin: 0;
  color: rgba(255, 255, 255, 0.42);
  font-size: 0.68rem;
  line-height: 1.6;
}

.footer-end {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 0.45rem;
  color: rgba(255, 255, 255, 0.5);
  font-size: 0.66rem;
}

.footer-end a {
  color: var(--cyan);
}

.reveal {
  opacity: 0;
  transform: translateY(2rem);
  transition: opacity 0.8s var(--ease), transform 0.8s var(--ease);
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

@keyframes hero-in {
  from { opacity: 0; transform: scale(1.08); }
  to { opacity: 1; transform: scale(1.015); }
}

@keyframes copy-in {
  from { opacity: 0; transform: translateY(2rem); }
  to { opacity: 1; transform: translateY(0); }
}

@keyframes scan {
  0% { transform: translateX(-110%); }
  100% { transform: translateX(310%); }
}

@keyframes pulse {
  0% { opacity: 0.8; inset: 44%; }
  100% { opacity: 0; inset: 0; }
}

@media (max-width: 1050px) {
  .intro {
    grid-template-columns: 0.25fr 1fr;
  }

  .intro-copy {
    grid-column: 2;
    max-width: 40rem;
  }

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

  .mixer-stage {
    min-height: 34rem;
  }

  .system-title {
    grid-template-columns: 0.35fr 1fr;
  }

  .system-title .eyebrow {
    grid-column: 2;
  }

  .system-title h2 {
    grid-column: 2;
  }

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

  .safety-grid > div:nth-child(2) {
    border-right: 0;
  }

  .safety-grid > div:nth-child(n + 3) {
    margin-top: 2rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--line);
  }

  .site-footer {
    grid-template-columns: 1fr 1.5fr;
  }

  .footer-end {
    grid-column: 1 / -1;
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (max-width: 760px) {
  .site-header {
    height: 4.5rem;
    padding-inline: 1.2rem;
  }

  .menu-toggle {
    z-index: 2;
    display: block;
  }

  .menu-toggle[aria-expanded="true"] > span:nth-child(2) {
    transform: translateY(3px) rotate(45deg);
  }

  .menu-toggle[aria-expanded="true"] > span:nth-child(3) {
    transform: translateY(-3px) rotate(-45deg);
  }

  .site-nav {
    position: fixed;
    inset: 0;
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    justify-content: center;
    gap: 1.5rem;
    padding: 7rem 1.5rem 2rem;
    background: rgba(5, 15, 27, 0.98);
    transform: translateX(100%);
    transition: transform 0.35s var(--ease);
  }

  .site-nav.open {
    transform: translateX(0);
  }

  .site-nav a {
    font-size: 1.7rem;
    letter-spacing: -0.03em;
  }

  .site-nav .nav-cta {
    margin-top: 1rem;
    font-size: 0.85rem;
    letter-spacing: 0.03em;
  }

  .hero {
    min-height: 48rem;
  }

  .hero-image {
    background-position: 66% center;
  }

  .hero-shade {
    background: linear-gradient(0deg, rgba(3, 12, 22, 0.98) 4%, rgba(3, 12, 22, 0.78) 53%, rgba(3, 12, 22, 0.26) 100%);
  }

  .hero-grid {
    display: none;
  }

  .hero-content {
    width: auto;
    margin: 0 1.25rem 4.5rem;
  }

  .hero h1,
  .section h2,
  .intro-heading h2,
  .principles h2,
  .faq h2,
  .contact h2,
  .mixer h2,
  .system h2,
  .safety h2 {
    font-size: clamp(2.7rem, 13vw, 4.4rem);
  }

  .hero h1 br:first-of-type {
    display: none;
  }

  .hero-copy {
    font-size: 0.95rem;
  }

  .hero-actions {
    align-items: stretch;
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .hero-note {
    line-height: 1.5;
  }

  .hero-readout,
  .scroll-cue {
    display: none;
  }

  .section {
    padding: 5rem 1.25rem;
  }

  .intro {
    display: block;
    min-height: auto;
  }

  .intro-heading {
    margin-top: 3rem;
  }

  .intro-copy {
    margin-top: 3rem;
  }

  .mixer-stage {
    min-height: 37rem;
  }

  .pulse-field {
    top: 30%;
    left: 50%;
    width: 15rem;
  }

  .session-card {
    right: 1rem;
    bottom: 1rem;
    left: 1rem;
    width: auto;
  }

  .system-title {
    display: block;
  }

  .system-title .eyebrow {
    margin-top: 3rem;
  }

  .system-visual {
    display: flex;
    min-height: auto;
    flex-direction: column;
    margin-top: 3rem;
  }

  .system-visual > svg {
    display: none;
  }

  .system-node {
    width: 100%;
    min-height: auto;
  }

  .system-node strong {
    margin-top: 3rem;
  }

  .system-core {
    width: 11rem;
  }

  .system-caption {
    align-items: flex-start;
    flex-direction: column;
    gap: 1rem;
    margin-top: 3rem;
  }

  .principles-head {
    display: block;
  }

  .principles-head h2 {
    margin-top: 3rem;
  }

  .principle-list {
    display: block;
    margin-top: 3rem;
  }

  .principle,
  .principle + .principle {
    min-height: auto;
    padding: 2rem 0;
    border-right: 0;
    border-bottom: 1px solid var(--dark-line);
  }

  .principle h3 {
    margin-top: 4rem;
  }

  .safety-panel {
    padding: 2rem 1.25rem;
    border-radius: 1.2rem;
  }

  .safety-grid {
    display: block;
    margin-top: 3rem;
  }

  .safety-grid > div,
  .safety-grid > div + div,
  .safety-grid > div:nth-child(n + 3) {
    margin: 0;
    padding: 1.5rem 0;
    border-top: 1px solid var(--line);
    border-right: 0;
  }

  .safety-grid strong {
    margin-top: 1.7rem;
  }

  .faq,
  .contact {
    grid-template-columns: 1fr;
  }

  .faq-head {
    position: static;
  }

  .faq-list summary {
    grid-template-columns: 2rem 1fr 1.2rem;
  }

  .faq-list details > p {
    margin-left: 3rem;
  }

  .form-grid {
    grid-template-columns: 1fr;
    gap: 0;
  }

  .site-footer {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3rem 1.25rem;
  }

  .footer-end {
    grid-column: auto;
    align-items: flex-start;
    flex-direction: column;
  }
}

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

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

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