/* ==========================================================================
   AMSU.SITE — Soft Voltage
   Calm form. Sharp energy.
   ========================================================================== */

:root {
  --ivory: #F7F3E8;
  --charcoal: #171817;
  --lime: #B7D83D;
  --coral: #F06B52;
  --taupe: #B8B1A3;

  --grad: linear-gradient(135deg, #B7D83D 0%, #F06B52 100%);
  --grad-wide: linear-gradient(90deg, #B7D83D 0%, #F06B52 100%);

  --font-display: "Space Grotesk", sans-serif;
  --font-body: "Manrope", sans-serif;

  --pad-x: clamp(1.25rem, 4vw, 4.5rem);
  --section-y: clamp(4.5rem, 10vw, 8.5rem);
  --max: 1240px;
  --nav-h: 4.25rem;
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --focus: 2px solid var(--lime);
}

/* Reset */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
}

body {
  background: var(--ivory);
  color: var(--charcoal);
  font-family: var(--font-body);
  font-weight: 400;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

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

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

ul,
ol {
  list-style: none;
}

button {
  font: inherit;
  border: none;
  background: none;
  cursor: pointer;
}

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

.skip-link {
  position: absolute;
  left: 1rem;
  top: -100%;
  z-index: 1000;
  background: var(--charcoal);
  color: var(--ivory);
  padding: 0.75rem 1rem;
  font-family: var(--font-body);
  font-size: 0.875rem;
}

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

/* Shared */
.section-inner {
  width: min(100% - (var(--pad-x) * 2), var(--max));
  margin-inline: auto;
}

.section-label {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--taupe);
  margin-bottom: 1.25rem;
}

.section-label.light {
  color: rgba(247, 243, 232, 0.55);
}

.section-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(2rem, 4vw, 3.25rem);
  letter-spacing: -0.04em;
  line-height: 0.95;
  color: var(--ivory);
}

.section-title.dark {
  color: var(--charcoal);
}

.section-head {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.gradient-line {
  width: 60px;
  height: 4px;
  background: var(--grad);
  background-size: 200% 200%;
  animation: accentShift 8s ease-in-out infinite;
  margin: 1.75rem 0;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.875rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.95rem 1.35rem;
  transition: transform 0.35s var(--ease), background 0.35s var(--ease), color 0.35s var(--ease);
}

.btn-primary {
  background: var(--charcoal);
  color: var(--ivory);
}

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

.btn-ghost {
  background: transparent;
  color: var(--charcoal);
  border-bottom: 1px solid rgba(23, 24, 23, 0.25);
  padding-inline: 0.15rem;
  padding-block: 0.95rem 0.7rem;
}

.btn-ghost:hover {
  border-bottom-color: var(--lime);
}

.btn-nav {
  background: var(--charcoal);
  color: var(--ivory);
  padding: 0.7rem 1rem;
  font-size: 0.75rem;
}

.btn-nav:hover {
  background: #252625;
}

.btn-cta {
  position: relative;
  padding-right: 2.75rem;
}

.btn-indicator {
  position: absolute;
  right: 0.85rem;
  width: 10px;
  height: 28px;
  background: var(--grad);
  background-size: 200% 200%;
  animation: accentShift 7s ease-in-out infinite;
}

/* ==========================================================================
   Navigation
   ========================================================================== */

.site-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--ivory);
  border-bottom: 1px solid rgba(23, 24, 23, 0.15);
  height: var(--nav-h);
}

.nav-inner {
  width: min(100% - (var(--pad-x) * 2), var(--max));
  margin-inline: auto;
  height: 100%;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
}

.nav-logo {
  display: inline-flex;
  align-items: baseline;
  gap: 0.05em;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.nav-logo-main {
  font-size: 1.35rem;
}

.nav-logo-dot {
  font-size: 0.7rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  color: var(--taupe);
}

.nav-center {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--taupe);
  text-align: center;
}

.nav-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 1.5rem;
}

.nav-explore {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  transition: color 0.3s var(--ease);
}

.nav-explore:hover {
  color: var(--coral);
}

.nav-mobile {
  display: none;
  align-items: center;
  gap: 1rem;
  justify-content: flex-end;
}

.nav-mobile-meta {
  font-family: var(--font-body);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--taupe);
}

.nav-menu {
  position: relative;
}

.nav-menu summary {
  list-style: none;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  cursor: pointer;
}

.nav-menu summary::-webkit-details-marker {
  display: none;
}

.nav-menu ul {
  position: absolute;
  right: 0;
  top: calc(100% + 0.85rem);
  min-width: 11rem;
  background: var(--ivory);
  border: 1px solid rgba(23, 24, 23, 0.15);
  padding: 0.75rem 0;
}

.nav-menu a {
  display: block;
  padding: 0.55rem 1rem;
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-menu a:hover {
  color: var(--coral);
  background: rgba(23, 24, 23, 0.03);
}

/* ==========================================================================
   Hero
   ========================================================================== */

.hero {
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--pad-x) clamp(2rem, 4vw, 3rem);
  min-height: calc(100svh - var(--nav-h));
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: end;
  width: min(100%, var(--max));
  margin-inline: auto;
  flex: 1;
}

.hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
  animation: fadeUp 0.9s var(--ease) both;
}

.hero-meta li {
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--taupe);
  text-transform: uppercase;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(4rem, 9vw, 9rem);
  line-height: 0.88;
  letter-spacing: -0.065em;
  font-weight: 700;
  display: flex;
  flex-direction: column;
  animation: fadeUp 1s var(--ease) 0.08s both;
}

.hero-title-accent {
  color: var(--lime);
}

.hero-support {
  max-width: 28rem;
  margin-top: clamp(1.25rem, 2.5vw, 2rem);
  font-size: clamp(1rem, 1.4vw, 1.125rem);
  color: var(--charcoal);
  animation: fadeUp 1s var(--ease) 0.16s both;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem 1.75rem;
  margin-top: clamp(1.75rem, 3vw, 2.5rem);
  animation: fadeUp 1s var(--ease) 0.24s both;
}

/* Hero Signal Object */
.signal-object {
  justify-self: end;
  width: min(100%, 420px);
  animation: fadeUp 1.1s var(--ease) 0.2s both;
}

.signal-frame {
  position: relative;
  aspect-ratio: 4 / 5;
  background: var(--charcoal);
  overflow: hidden;
  padding: 1.5rem;
}

.signal-ring {
  position: absolute;
  inset: 18% 16% 28% 16%;
  border: 1.5px solid var(--lime);
  border-radius: 50%;
  animation: ringPulse 6s ease-in-out infinite;
}

.signal-coral {
  position: absolute;
  top: 14%;
  right: 14%;
  width: 14px;
  height: 14px;
  background: var(--coral);
  border-radius: 50%;
  animation: indicatorPulse 3.5s ease-in-out infinite;
}

.signal-gradient {
  position: absolute;
  bottom: 22%;
  left: 18%;
  width: 45px;
  height: 45px;
  border-radius: 50%;
  background: var(--grad);
  background-size: 200% 200%;
  animation: accentShift 9s ease-in-out infinite, floatSoft 5s ease-in-out infinite;
}

.signal-strip {
  position: absolute;
  top: 22%;
  left: 12%;
  width: 48px;
  height: 4px;
  background: var(--grad);
  background-size: 200% 100%;
  animation: accentShift 8s ease-in-out infinite;
}

.signal-measures {
  position: absolute;
  left: 10%;
  bottom: 12%;
  display: flex;
  gap: 6px;
  align-items: flex-end;
}

.signal-measures span {
  display: block;
  width: 1px;
  background: rgba(247, 243, 232, 0.35);
}

.signal-measures span:nth-child(1) { height: 18px; }
.signal-measures span:nth-child(2) { height: 28px; }
.signal-measures span:nth-child(3) { height: 12px; }
.signal-measures span:nth-child(4) { height: 22px; }

.signal-number {
  position: absolute;
  right: 8%;
  bottom: 8%;
  font-family: var(--font-display);
  font-size: clamp(4.5rem, 10vw, 6.5rem);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.07em;
  color: rgba(247, 243, 232, 0.08);
}

.signal-data {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 0.65rem;
  max-width: 9rem;
}

.signal-data div {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  border-bottom: 1px solid rgba(247, 243, 232, 0.12);
  padding-bottom: 0.35rem;
}

.signal-data dt,
.signal-data dd {
  font-family: var(--font-body);
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.signal-data dt {
  color: var(--taupe);
}

.signal-data dd {
  color: var(--ivory);
}

.hero-scroll {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  width: min(100%, var(--max));
  margin: clamp(2rem, 4vw, 3rem) auto 0;
  font-family: var(--font-body);
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--taupe);
}

.hero-scroll-line {
  display: block;
  width: 20px;
  height: 2px;
  background: var(--lime);
  animation: lineExpand 2.8s ease-in-out infinite;
}

/* ==========================================================================
   Brand Statement
   ========================================================================== */

.statement {
  background: var(--charcoal);
  color: var(--ivory);
  padding: var(--section-y) 0;
}

.statement-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.25rem, 8vw, 7rem);
  line-height: 0.9;
  letter-spacing: -0.06em;
  display: flex;
  flex-direction: column;
}

.statement-copy {
  max-width: 32rem;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  color: rgba(247, 243, 232, 0.78);
}

/* ==========================================================================
   Signal Principles
   ========================================================================== */

.principles {
  background: var(--charcoal);
  padding: 0 0 var(--section-y);
}

.principle-list {
  border-top: 1px solid rgba(247, 243, 232, 0.15);
}

.principle-row {
  border-bottom: 1px solid rgba(247, 243, 232, 0.15);
}

.principle-link {
  position: relative;
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: clamp(1rem, 3vw, 2.5rem);
  padding: clamp(1.75rem, 3.5vw, 2.75rem) 0;
  color: var(--ivory);
}

.principle-marker {
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--lime);
  transform: scaleY(0);
  transform-origin: center;
  transition: transform 0.4s var(--ease);
}

.principle-num {
  font-family: var(--font-display);
  font-size: clamp(3rem, 6vw, 5rem);
  font-weight: 700;
  letter-spacing: -0.06em;
  line-height: 0.9;
  color: rgba(247, 243, 232, 0.22);
  transition: color 0.35s var(--ease);
  min-width: 2.2em;
}

.principle-body h3 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  letter-spacing: -0.04em;
  margin-bottom: 0.35rem;
}

.principle-body p {
  font-size: 1rem;
  color: var(--taupe);
}

.principle-arrow {
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--taupe);
  transition: transform 0.35s var(--ease), color 0.35s var(--ease);
}

.principle-dot {
  position: absolute;
  right: 3.5rem;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--coral);
  opacity: 0;
  transform: scale(0.4);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
}

.principle-link:hover .principle-marker,
.principle-link:focus-visible .principle-marker {
  transform: scaleY(1);
}

.principle-link:hover .principle-num,
.principle-link:focus-visible .principle-num {
  color: var(--lime);
}

.principle-link:hover .principle-arrow,
.principle-link:focus-visible .principle-arrow {
  transform: translateX(8px);
  color: var(--ivory);
}

.principle-link:hover .principle-dot,
.principle-link:focus-visible .principle-dot {
  opacity: 1;
  transform: scale(1);
}

/* ==========================================================================
   Amsu Object
   ========================================================================== */

.amsu-object {
  background: var(--ivory);
  padding: var(--section-y) 0;
}

.object-grid {
  display: grid;
  grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
  gap: clamp(2.5rem, 6vw, 5rem);
  align-items: center;
}

.object-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.5rem, 8vw, 7rem);
  line-height: 0.88;
  letter-spacing: -0.065em;
  display: flex;
  flex-direction: column;
}

.object-desc {
  margin-top: 1.5rem;
  max-width: 24rem;
  color: var(--charcoal);
  font-size: 1.05rem;
}

.object-stage {
  width: 100%;
}

.object-base {
  position: relative;
  aspect-ratio: 1 / 1;
  max-width: 540px;
  margin-inline: auto;
  background: var(--charcoal);
  overflow: hidden;
}

.object-frame {
  position: absolute;
  inset: 14%;
  border: 2px solid var(--lime);
  clip-path: polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}

.object-indicator {
  position: absolute;
  top: 18%;
  right: 18%;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  background: var(--coral);
  animation: indicatorPulse 3.2s ease-in-out infinite;
}

.object-accent {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 80px;
  height: 80px;
  transform: translate(-50%, -50%);
  background: var(--grad);
  background-size: 200% 200%;
  border-radius: 50%;
  animation: accentShift 10s ease-in-out infinite, rotateSoft 18s linear infinite;
}

.object-lines {
  position: absolute;
  left: 12%;
  bottom: 16%;
  display: grid;
  gap: 8px;
}

.object-lines span {
  display: block;
  height: 1px;
  background: rgba(247, 243, 232, 0.35);
}

.object-lines span:nth-child(1) { width: 72px; }
.object-lines span:nth-child(2) { width: 48px; }
.object-lines span:nth-child(3) { width: 60px; }

.object-labels {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.object-labels li {
  position: absolute;
  font-family: var(--font-body);
  font-size: 0.62rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: rgba(247, 243, 232, 0.65);
  text-transform: uppercase;
}

.object-labels li:nth-child(1) { top: 8%; left: 8%; }
.object-labels li:nth-child(2) { top: 8%; right: 8%; }
.object-labels li:nth-child(3) { bottom: 8%; left: 8%; }
.object-labels li:nth-child(4) { bottom: 8%; right: 8%; }

/* ==========================================================================
   Direction System
   ========================================================================== */

.direction {
  background: var(--charcoal);
  color: var(--ivory);
  padding: var(--section-y) 0;
}

.direction-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.25rem, 8vw, 6.5rem);
  line-height: 0.9;
  letter-spacing: -0.06em;
  display: flex;
  flex-direction: column;
  margin-bottom: clamp(3rem, 6vw, 5rem);
}

.direction-track {
  position: relative;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1.5rem;
}

.direction-track::before {
  content: "";
  position: absolute;
  top: 1.1rem;
  left: 0;
  right: 0;
  height: 1px;
  background: var(--lime);
  opacity: 0.55;
}

.direction-track::after {
  content: "";
  position: absolute;
  top: 1.05rem;
  left: 62%;
  width: 12%;
  height: 3px;
  background: var(--grad-wide);
  background-size: 200% 100%;
  animation: accentShift 8s ease-in-out infinite;
}

.direction-stage {
  position: relative;
  padding-top: 2.75rem;
}

.direction-num {
  position: absolute;
  top: 0;
  left: 0;
  width: 2.2rem;
  height: 2.2rem;
  display: grid;
  place-items: center;
  background: var(--charcoal);
  border: 1px solid var(--lime);
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 600;
  z-index: 1;
}

.direction-stage h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 0.5rem;
}

.direction-stage p {
  font-size: 0.95rem;
  color: var(--taupe);
  max-width: 14rem;
}

.direction-accent {
  display: block;
  width: 18px;
  height: 3px;
  background: var(--lime);
  margin-top: 1.1rem;
}

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

.direction-accent.gradient {
  width: 28px;
  background: var(--grad);
  background-size: 200% 100%;
  animation: accentShift 7s ease-in-out infinite;
}

/* ==========================================================================
   Visual Studies
   ========================================================================== */

.studies {
  background: var(--ivory);
  padding: var(--section-y) 0;
}

.studies-grid {
  display: grid;
  grid-template-columns: 1.15fr 0.85fr;
  grid-template-rows: auto auto;
  gap: 1.25rem;
}

.study {
  position: relative;
  min-height: 280px;
  padding: 1.5rem;
  overflow: hidden;
}

.study-01 {
  grid-row: span 2;
  min-height: 520px;
  background: var(--ivory);
  border: 1px solid rgba(23, 24, 23, 0.12);
}

.study-02 {
  background: var(--charcoal);
  color: var(--ivory);
}

.study-03 {
  background: var(--ivory);
  border: 1px solid rgba(23, 24, 23, 0.12);
}

.study-label {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--taupe);
  margin-bottom: 0.4rem;
}

.study-02 .study-label {
  color: rgba(247, 243, 232, 0.45);
}

.study h3 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 3vw, 2.5rem);
  font-weight: 700;
  letter-spacing: -0.04em;
}

.study-02 h3 {
  color: var(--lime);
}

.study-comp {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

/* Study 01 — Form */
.s01-block {
  position: absolute;
  left: 12%;
  bottom: 14%;
  width: 42%;
  aspect-ratio: 1;
  background: var(--charcoal);
}

.s01-bar {
  position: absolute;
  right: 14%;
  top: 28%;
  width: 28%;
  height: 12px;
  background: var(--charcoal);
}

.s01-lime {
  position: absolute;
  right: 14%;
  top: 28%;
  width: 12px;
  height: 12px;
  background: var(--lime);
  transform: translateX(100%);
}

.s01-thin {
  position: absolute;
  left: 12%;
  bottom: 10%;
  width: 58%;
  height: 1px;
  background: rgba(23, 24, 23, 0.25);
}

/* Study 02 — Signal */
.s02-type {
  position: absolute;
  left: 8%;
  bottom: 6%;
  font-family: var(--font-display);
  font-size: clamp(5rem, 12vw, 8rem);
  font-weight: 700;
  line-height: 0.8;
  letter-spacing: -0.07em;
  color: var(--lime);
}

.s02-coral {
  position: absolute;
  top: 28%;
  right: 16%;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  background: var(--coral);
  animation: indicatorPulse 3.8s ease-in-out infinite;
}

.s02-rule {
  position: absolute;
  top: 36%;
  left: 10%;
  width: 40%;
  height: 1px;
  background: rgba(247, 243, 232, 0.25);
}

/* Study 03 — Shift */
.s03-a {
  position: absolute;
  left: 18%;
  bottom: 18%;
  width: 38%;
  aspect-ratio: 1;
  background: var(--charcoal);
}

.s03-b {
  position: absolute;
  left: 34%;
  bottom: 30%;
  width: 32%;
  aspect-ratio: 1;
  background: rgba(23, 24, 23, 0.18);
  border: 1px solid var(--charcoal);
}

.s03-grad {
  position: absolute;
  right: 14%;
  top: 34%;
  width: 96px;
  height: 36px;
  background: var(--grad);
  background-size: 200% 100%;
  animation: accentShift 9s ease-in-out infinite;
}

/* ==========================================================================
   Dark Energy
   ========================================================================== */

.energy {
  background: var(--charcoal);
  padding: var(--section-y) 0;
}

.energy-inner {
  display: grid;
  grid-template-columns: 1.4fr 0.6fr;
  gap: 2rem;
  align-items: end;
}

.energy-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.5rem, 9vw, 8rem);
  line-height: 0.88;
  letter-spacing: -0.065em;
  color: var(--ivory);
  display: flex;
  flex-direction: column;
}

.energy-accent {
  color: var(--lime);
}

.energy-accents {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2.5rem;
  padding-bottom: 0.5rem;
}

.energy-circle {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--grad);
  background-size: 200% 200%;
  animation: accentShift 8s ease-in-out infinite;
}

.energy-line {
  width: 70px;
  height: 4px;
  background: var(--grad);
  background-size: 200% 100%;
  animation: accentShift 9s ease-in-out infinite;
}

.energy-rect {
  width: 90px;
  height: 28px;
  background: var(--grad);
  background-size: 200% 100%;
  animation: accentShift 10s ease-in-out infinite;
}

/* ==========================================================================
   Final CTA
   ========================================================================== */

.cta {
  background: var(--ivory);
  padding: var(--section-y) 0;
}

.cta-inner {
  max-width: 52rem;
}

.cta-title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(3.75rem, 10vw, 8.5rem);
  line-height: 0.88;
  letter-spacing: -0.065em;
  display: flex;
  flex-direction: column;
  color: var(--charcoal);
}

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

.cta-copy {
  margin-top: 1.5rem;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  max-width: 28rem;
}

.cta-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.25rem 1.75rem;
  margin-top: 2.25rem;
}

/* ==========================================================================
   Footer
   ========================================================================== */

.site-footer {
  background: var(--charcoal);
  color: var(--ivory);
  padding: clamp(3.5rem, 7vw, 5.5rem) 0 2rem;
}

.footer-inner {
  width: min(100% - (var(--pad-x) * 2), var(--max));
  margin-inline: auto;
}

.footer-brand {
  margin-bottom: clamp(2.5rem, 5vw, 4rem);
}

.footer-logo {
  display: flex;
  align-items: baseline;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.05em;
  line-height: 0.9;
}

.footer-logo-main {
  font-size: clamp(4rem, 12vw, 8rem);
}

.footer-logo-dot {
  font-size: clamp(1rem, 2.5vw, 1.5rem);
  font-weight: 500;
  color: var(--taupe);
  letter-spacing: 0.08em;
}

.footer-tagline {
  margin-top: 1rem;
  font-size: 1.05rem;
  color: var(--taupe);
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  padding: 2.5rem 0;
  border-top: 1px solid rgba(247, 243, 232, 0.12);
  border-bottom: 1px solid rgba(247, 243, 232, 0.12);
}

.footer-cols h3 {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  margin-bottom: 1rem;
}

.footer-cols a {
  display: inline-block;
  font-size: 0.95rem;
  color: var(--taupe);
  margin-bottom: 0.55rem;
  transition: color 0.3s var(--ease);
}

.footer-cols a:hover {
  color: var(--lime);
}

.footer-bottom {
  padding-top: 1.75rem;
}

.footer-bottom p {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--taupe);
}

.footer-grad {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--grad);
  background-size: 200% 200%;
  animation: accentShift 8s ease-in-out infinite;
}

/* ==========================================================================
   Animations
   ========================================================================== */

@keyframes accentShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

@keyframes lineExpand {
  0%, 100% { width: 20px; }
  50% { width: 45px; }
}

@keyframes indicatorPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.15); opacity: 0.75; }
}

@keyframes ringPulse {
  0%, 100% { transform: scale(1); opacity: 1; }
  50% { transform: scale(1.03); opacity: 0.85; }
}

@keyframes floatSoft {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-6px); }
}

@keyframes rotateSoft {
  from { transform: translate(-50%, -50%) rotate(0deg); }
  to { transform: translate(-50%, -50%) rotate(360deg); }
}

@keyframes fadeUp {
  from {
    opacity: 0;
    transform: translateY(18px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* ==========================================================================
   Responsive
   ========================================================================== */

@media (max-width: 980px) {
  .hero-grid {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .signal-object {
    justify-self: stretch;
    width: min(100%, 380px);
    margin-inline: auto;
  }

  .object-grid,
  .energy-inner {
    grid-template-columns: 1fr;
  }

  .energy-accents {
    flex-direction: row;
    align-items: center;
    justify-content: flex-start;
    gap: 2rem;
  }

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

  .study-01 {
    grid-column: span 2;
    grid-row: auto;
    min-height: 360px;
  }

  .direction-track {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem 1.5rem;
  }

  .direction-track::before,
  .direction-track::after {
    display: none;
  }
}

@media (max-width: 720px) {
  .nav-inner {
    grid-template-columns: 1fr auto;
  }

  .nav-center,
  .nav-actions {
    display: none;
  }

  .nav-mobile {
    display: flex;
  }

  .hero {
    min-height: auto;
    padding-top: 2rem;
  }

  .hero-title {
    font-size: clamp(3.25rem, 16vw, 5rem);
  }

  .principle-link {
    grid-template-columns: auto 1fr;
    gap: 1rem;
  }

  .principle-arrow,
  .principle-dot {
    display: none;
  }

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

  .study-01 {
    grid-column: auto;
    min-height: 320px;
  }

  .direction-track {
    grid-template-columns: 1fr;
    gap: 0;
    border-left: 1px solid rgba(183, 216, 61, 0.45);
    padding-left: 1.5rem;
  }

  .direction-stage {
    padding: 0 0 2.25rem;
  }

  .direction-stage:last-child {
    padding-bottom: 0;
  }

  .direction-num {
    left: -2.55rem;
  }

  .direction-track::after {
    display: block;
    left: -1px;
    top: auto;
    bottom: 0;
    width: 3px;
    height: 70px;
    background: var(--grad);
  }

  .footer-cols {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .s03-grad {
    width: 80px;
    height: 30px;
  }
}

@media (max-width: 480px) {
  :root {
    --pad-x: 1.25rem;
  }

  .hero-actions,
  .cta-actions {
    flex-direction: column;
    align-items: flex-start;
  }

  .signal-frame {
    aspect-ratio: 5 / 6;
  }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    scroll-behavior: auto !important;
    transition-duration: 0.01ms !important;
  }
}