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

html {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  scroll-behavior: smooth;
  scroll-padding-top: 5rem;
  hanging-punctuation: first last;
}

/* ===== DESIGN TOKENS ===== */
:root {
  /* Fonts */
  --font-display: 'Instrument Serif', Georgia, serif;
  --font-body: 'Satoshi', 'Inter', sans-serif;

  /* Type Scale */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.875rem);
  --text-sm: clamp(0.875rem, 0.8rem + 0.35vw, 1rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.125rem);
  --text-lg: clamp(1.125rem, 1rem + 0.75vw, 1.5rem);
  --text-xl: clamp(1.5rem, 1.2rem + 1.25vw, 2.25rem);
  --text-2xl: clamp(2rem, 1.2rem + 2.5vw, 3.5rem);
  --text-3xl: clamp(2.5rem, 1rem + 4vw, 5rem);

  /* Spacing (4px system) */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content Widths */
  --content-default: 960px;
  --content-narrow: 640px;
  --content-wide: 1100px;
}

/* ===== DARK OCEAN PALETTE (only mode) ===== */
[data-theme="dark"] {
  --color-bg: #070b14;
  --color-surface: #0c1220;
  --color-surface-2: #111827;
  --color-border: #1e2d40;
  --color-divider: #162236;

  --color-text: #c8d6e5;
  --color-text-muted: #6b7f96;
  --color-text-faint: #3d5068;

  --color-accent: #2dd4bf;
  --color-accent-muted: rgba(45, 212, 191, 0.15);
  --color-accent-strong: #14b8a6;
  --color-accent-glow: rgba(45, 212, 191, 0.06);

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 12px 40px rgba(0, 0, 0, 0.6);
}

/* ===== BASE ===== */
body {
  min-height: 100dvh;
  line-height: 1.6;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-bg);
  overflow-x: hidden;
}

img, picture, video, canvas, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

h1, h2, h3, h4, h5, h6 {
  text-wrap: balance;
  line-height: 1.15;
}

p, li, figcaption {
  text-wrap: pretty;
  max-width: 72ch;
}

::selection {
  background: rgba(45, 212, 191, 0.25);
  color: #fff;
}

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: var(--radius-sm);
}

a, button, [role="button"] {
  transition:
    color var(--transition-interactive),
    background var(--transition-interactive),
    border-color var(--transition-interactive),
    box-shadow var(--transition-interactive),
    opacity var(--transition-interactive);
}

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

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

/* ===== NAV ===== */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: var(--space-4) var(--space-6);
  background: rgba(7, 11, 20, 0.7);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.4s ease, background 0.4s ease;
}

.nav--scrolled {
  border-bottom-color: var(--color-border);
  background: rgba(7, 11, 20, 0.92);
}

.nav__inner {
  max-width: var(--content-wide);
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav__logo {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--color-text);
}

.nav__logo svg {
  color: var(--color-accent);
  display: inline-block;
}

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

.nav__links a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-weight: 400;
  letter-spacing: 0.02em;
}

.nav__links a:hover {
  color: var(--color-text);
}

.nav__cta {
  padding: var(--space-2) var(--space-5);
  background: var(--color-accent);
  color: var(--color-bg) !important;
  border-radius: var(--radius-sm);
  font-weight: 500;
  font-size: var(--text-xs) !important;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

.nav__cta:hover {
  background: var(--color-accent-strong);
}

/* Mobile nav */
@media (max-width: 640px) {
  .nav__links a:not(.nav__cta) {
    display: none;
  }
  .nav {
    padding: var(--space-3) var(--space-4);
  }
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100dvh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-32) var(--space-6) var(--space-16);
  overflow: hidden;
}

.hero__depth-lines {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 0;
  opacity: 0.3;
}

.hero__line {
  position: absolute;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(
    90deg,
    transparent 0%,
    var(--color-border) 20%,
    var(--color-border) 80%,
    transparent 100%
  );
  opacity: 0.4;
}

.hero__line--1 { top: 72%; }
.hero__line--2 { top: 82%; opacity: 0.25; }
.hero__line--3 { top: 92%; opacity: 0.15; }

.hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 800px;
}

.hero__eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-6);
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-3xl);
  font-weight: 400;
  line-height: 1.08;
  color: #e8edf4;
  margin-bottom: var(--space-8);
  font-style: normal;
}

.hero__subtitle {
  font-size: var(--text-base);
  color: #94a3b8;
  line-height: 1.7;
  max-width: 560px;
  margin: 0 auto var(--space-10);
}

.hero__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  margin-bottom: var(--space-8);
}

.hero__founding {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  letter-spacing: 0.03em;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-3) var(--space-6);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  letter-spacing: 0.02em;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
}

.btn--primary {
  background: var(--color-accent);
  color: var(--color-bg);
  border-color: var(--color-accent);
}

.btn--primary:hover {
  background: var(--color-accent-strong);
  border-color: var(--color-accent-strong);
}

.btn--ghost {
  background: transparent;
  color: var(--color-text-muted);
  border-color: var(--color-border);
}

.btn--ghost:hover {
  color: var(--color-text);
  border-color: var(--color-text-muted);
}

.btn--large {
  padding: var(--space-4) var(--space-8);
  font-size: var(--text-base);
}

/* ===== SECTION SYSTEM ===== */
.section {
  padding: clamp(var(--space-16), 8vw, var(--space-32)) var(--space-6);
}

.section__inner {
  max-width: var(--content-default);
  margin: 0 auto;
}

.section__inner--narrow {
  max-width: var(--content-narrow);
}

.section__eyebrow {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: var(--space-4);
}

.section__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 400;
  color: #e8edf4;
  margin-bottom: var(--space-4);
  line-height: 1.1;
}

.section__subtitle {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  margin-bottom: var(--space-10);
}

.section__body {
  font-size: var(--text-base);
  color: var(--color-text-muted);
  line-height: 1.7;
  margin-bottom: var(--space-6);
}

.section__body--accent {
  color: var(--color-accent);
  font-weight: 500;
}

.section__body--centered {
  text-align: center;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.section__body--small {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
}

/* ===== PROBLEM / FAILURES ===== */
.section--problem {
  border-top: 1px solid var(--color-divider);
}

.failures {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-8);
  margin: var(--space-12) 0;
}

.failure {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.failure__number {
  font-family: var(--font-body);
  font-size: var(--text-xs);
  font-weight: 700;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  margin-bottom: var(--space-4);
}

.failure__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: #e8edf4;
  margin-bottom: var(--space-3);
}

.failure__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

@media (max-width: 768px) {
  .failures {
    grid-template-columns: 1fr;
    gap: var(--space-4);
  }
}

/* ===== PULLQUOTE ===== */
.pullquote {
  border-left: 2px solid var(--color-accent);
  padding: var(--space-6) var(--space-8);
  margin: var(--space-10) 0;
}

.pullquote p {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-style: italic;
  color: #e8edf4;
  line-height: 1.5;
}

.pullquote--centered {
  border-left: none;
  text-align: center;
  padding: var(--space-8) 0;
}

.pullquote--centered p {
  max-width: 640px;
  margin: 0 auto;
}

/* ===== INVERSION ===== */
.section--inversion {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

/* ===== PRINCIPLES ===== */
.principles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin-top: var(--space-10);
}

.principle {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.principle__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 400;
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.principle__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

@media (max-width: 640px) {
  .principles {
    grid-template-columns: 1fr;
  }
}

/* ===== ARCHITECTURE ===== */
.section--architecture {
  border-top: 1px solid var(--color-divider);
}

.layers {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin: var(--space-12) 0;
}

.layer {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  position: relative;
}

.layer__ring {
  width: 80px;
  height: 80px;
  border-radius: 50%;
  border: 2px solid var(--color-accent);
  margin: 0 auto var(--space-6);
  position: relative;
  opacity: 0.7;
}

.layer--soul .layer__ring {
  width: 100px;
  height: 100px;
  opacity: 1;
  box-shadow: 0 0 30px rgba(45, 212, 191, 0.12);
}

.layer--core .layer__ring {
  width: 80px;
  height: 80px;
  opacity: 0.6;
}

.layer--cortex .layer__ring {
  width: 60px;
  height: 60px;
  opacity: 0.4;
  border-style: dashed;
}

.layer__name {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 400;
  color: #e8edf4;
  margin-bottom: var(--space-1);
}

.layer__role {
  font-size: var(--text-xs);
  color: var(--color-accent);
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: var(--space-3);
}

.layer__desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  max-width: 280px;
  margin: 0 auto;
}

@media (max-width: 768px) {
  .layers {
    grid-template-columns: 1fr;
    gap: var(--space-10);
  }
}

/* Crystal Block */
.crystal-block {
  text-align: center;
  padding: var(--space-8);
  border: 1px solid var(--color-accent);
  border-radius: var(--radius-md);
  background: var(--color-accent-glow);
  margin-bottom: var(--space-12);
}

.crystal-block__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: var(--color-accent);
  margin-bottom: var(--space-3);
}

.crystal-block__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.7;
  max-width: 580px;
  margin: 0 auto;
}

/* Mechanisms */
.mechanisms {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-4);
}

.mechanism {
  padding: var(--space-5);
  border-left: 2px solid var(--color-border);
}

.mechanism h4 {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: #e8edf4;
  margin-bottom: var(--space-2);
}

.mechanism p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
}

@media (max-width: 640px) {
  .mechanisms {
    grid-template-columns: 1fr;
  }
}

/* ===== PROOF / STATS ===== */
.section--proof {
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
  border-bottom: 1px solid var(--color-divider);
}

.stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: var(--space-6);
  margin: var(--space-10) 0;
}

.stat {
  text-align: center;
  padding: var(--space-6) var(--space-4);
}

.stat__number {
  display: block;
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  color: var(--color-accent);
  line-height: 1;
  margin-bottom: var(--space-2);
}

.stat__label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

@media (max-width: 768px) {
  .stats {
    grid-template-columns: repeat(2, 1fr);
    gap: var(--space-4);
  }
}

/* ===== COMPETITIVE ===== */
.comparison__table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-8) 0;
  font-size: var(--text-sm);
}

.comparison__table thead th {
  text-align: left;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: var(--text-xs);
  color: var(--color-accent);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.comparison__table tbody td {
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  color: var(--color-text-muted);
  line-height: 1.5;
  vertical-align: top;
}

.comparison__table tbody td:first-child {
  color: #e8edf4;
  font-weight: 500;
  white-space: nowrap;
}

.comparison__table tbody td:last-child {
  color: var(--color-accent);
  font-weight: 500;
}

@media (max-width: 640px) {
  .comparison__table {
    font-size: var(--text-xs);
  }
  .comparison__table tbody td:first-child {
    white-space: normal;
  }
}

/* ===== START ===== */
.section--start {
  border-top: 1px solid var(--color-divider);
}

.exits {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
  margin: var(--space-10) 0;
}

.exit {
  padding: var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.exit h3 {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: #e8edf4;
  margin-bottom: var(--space-3);
}

.exit p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
}

@media (max-width: 640px) {
  .exits {
    grid-template-columns: 1fr;
  }
}

/* Quick Start Block */
.start-block {
  text-align: center;
  padding: var(--space-10) var(--space-6);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.start-block__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  color: #e8edf4;
  margin-bottom: var(--space-6);
}

.start-block__code {
  display: inline-block;
  padding: var(--space-3) var(--space-6);
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  margin-bottom: var(--space-6);
}

.start-block__code code {
  font-family: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  font-size: var(--text-sm);
  color: var(--color-accent);
  letter-spacing: 0.02em;
}

.start-block__text {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.65;
  max-width: 520px;
  margin: 0 auto var(--space-8);
}

.start-block__actions {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-4);
  flex-wrap: wrap;
}

/* ===== CLOSE ===== */
.section--close {
  text-align: center;
  padding: clamp(var(--space-16), 10vw, var(--space-32)) var(--space-6);
  background: var(--color-surface);
  border-top: 1px solid var(--color-divider);
}

.close-quote {
  margin-bottom: var(--space-10);
}

.close-quote__ru {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-style: italic;
  color: #e8edf4;
  margin-bottom: var(--space-3);
}

.close-quote__en {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  font-style: italic;
}

.close-text {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  color: #e8edf4;
  line-height: 1.6;
  margin-bottom: var(--space-8);
}

.close-final {
  font-size: var(--text-sm);
  color: var(--color-text-faint);
  font-style: italic;
  max-width: 480px;
  margin: 0 auto;
  line-height: 1.7;
}

/* ===== ORIGIN ===== */
.section--origin {
  text-align: center;
  border-top: 1px solid var(--color-divider);
  background: var(--color-bg);
}

.section--origin .section__title {
  font-size: var(--text-xl);
  letter-spacing: -0.01em;
}

.section--origin .section__body--accent {
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  margin-top: var(--space-8);
}

/* ===== FOOTER ===== */
.footer {
  border-top: 1px solid var(--color-divider);
  padding: var(--space-10) var(--space-6) var(--space-6);
}

.footer__inner {
  max-width: var(--content-default);
  margin: 0 auto;
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: var(--space-8);
  padding-bottom: var(--space-8);
  border-bottom: 1px solid var(--color-divider);
}

.footer__brand {
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  color: #e8edf4;
  margin-bottom: var(--space-2);
}

.footer__tagline {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__center {
  text-align: center;
}

.footer__founder {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  margin-bottom: var(--space-1);
}

.footer__email {
  font-size: var(--text-xs);
  color: var(--color-accent);
  display: inline-block;
  margin-bottom: var(--space-3);
}

.footer__email:hover {
  color: var(--color-accent-strong);
}

.footer__partnership {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 280px;
  margin: 0 auto;
}

.footer__right {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
}

.footer__right a {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

.footer__right a:hover {
  color: var(--color-text);
}

.footer__license {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
}

.footer__bottom {
  max-width: var(--content-default);
  margin: 0 auto;
  padding-top: var(--space-6);
  text-align: center;
}

.footer__bottom p {
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  margin: 0 auto;
}

@media (max-width: 640px) {
  .footer__inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: var(--space-6);
  }
  .footer__right {
    align-items: center;
    flex-direction: row;
    justify-content: center;
    gap: var(--space-4);
  }
}

/* ===== SCROLL ANIMATIONS ===== */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.7s cubic-bezier(0.16, 1, 0.3, 1);
}

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

/* Stagger children */
.reveal-stagger > * {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
}

.reveal-stagger.is-visible > *:nth-child(1) { transition-delay: 0ms; }
.reveal-stagger.is-visible > *:nth-child(2) { transition-delay: 80ms; }
.reveal-stagger.is-visible > *:nth-child(3) { transition-delay: 160ms; }
.reveal-stagger.is-visible > *:nth-child(4) { transition-delay: 240ms; }

.reveal-stagger.is-visible > * {
  opacity: 1;
  transform: translateY(0);
}

/* Hero subtle entrance */
.hero__content {
  animation: heroFadeIn 1.2s cubic-bezier(0.16, 1, 0.3, 1) 0.2s both;
}

@keyframes heroFadeIn {
  from {
    opacity: 0;
    transform: translateY(32px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Depth lines slow drift */
.hero__line--1 {
  animation: lineDrift 20s ease-in-out infinite alternate;
}
.hero__line--2 {
  animation: lineDrift 25s ease-in-out infinite alternate-reverse;
}
.hero__line--3 {
  animation: lineDrift 30s ease-in-out infinite alternate;
}

@keyframes lineDrift {
  from { transform: translateX(-2%); }
  to   { transform: translateX(2%); }
}

/* Layer rings slow pulse */
.layer__ring {
  animation: ringPulse 4s ease-in-out infinite;
}

.layer--core .layer__ring {
  animation-delay: 0.5s;
}

.layer--cortex .layer__ring {
  animation-delay: 1s;
}

@keyframes ringPulse {
  0%, 100% { transform: scale(1); opacity: var(--ring-opacity, 0.7); }
  50%      { transform: scale(1.04); opacity: calc(var(--ring-opacity, 0.7) + 0.15); }
}

.layer--soul   { --ring-opacity: 1; }
.layer--core   { --ring-opacity: 0.6; }
.layer--cortex { --ring-opacity: 0.4; }