/**
 * NEURONIC Public Site Stylesheet
 * Server-rendered, accessible (WCAG 2.2 AA target), responsive, and bidirectional (LTR/RTL).
 * Uses CSS logical properties throughout.
 */

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

html {
  font-size: 16px;
  scroll-behavior: smooth;
  text-size-adjust: 100%;
}

body {
  background-color: var(--color-canvas);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: var(--leading-normal);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Persian / RTL Font and Typography Adjustments */
html[dir="rtl"] body {
  font-family: var(--font-persian);
  line-height: var(--leading-persian);
}

h1, h2, h3, h4, h5, h6 {
  color: var(--color-brand);
  margin-block-end: var(--space-3);
}

h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.15;
}

h2 {
  font-family: var(--font-heading);
  font-weight: 650;
  letter-spacing: -0.02em;
  line-height: 1.25;
}

h3 {
  font-family: var(--font-heading);
  font-weight: 600;
  letter-spacing: -0.015em;
  line-height: 1.35;
}

h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--color-text);
  line-height: var(--leading-normal);
  margin-block-end: var(--space-2);
  font-weight: 600;
  letter-spacing: -0.01em;
}

html[dir="rtl"] h1,
html[dir="rtl"] h2,
html[dir="rtl"] h3,
html[dir="rtl"] h4,
html[dir="rtl"] h5,
html[dir="rtl"] h6 {
  font-family: var(--font-persian) !important;
  font-weight: 700;
  font-style: normal;
  letter-spacing: normal;
}

p {
  margin-block-end: var(--space-4);
}

a {
  color: var(--color-brand);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-science);
}

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

/* Skip link for assistive navigation */
.skip-link {
  position: absolute;
  inset-block-start: -999px;
  inset-inline-start: var(--space-4);
  background-color: var(--color-brand);
  color: var(--color-brand-contrast);
  padding: var(--space-2) var(--space-4);
  font-weight: 600;
  border-radius: var(--radius-sm);
  z-index: 9999;
  text-decoration: none;
}

.skip-link:focus {
  inset-block-start: var(--space-4);
}

/* Container */
.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-6);
  }
}

@media (min-width: 1280px) {
  .container {
    max-width: 1280px;
  }
}

/* Layout Shell & Architectural Spacing */
main#main-content {
  flex: 1 0 auto;
  width: 100%;
  padding-block-start: var(--layout-header-spacing);
  padding-block-end: var(--layout-footer-spacing);
}

main#main-content:has(.hero-section),
main#main-content:has(.hero) {
  padding-block-start: 0;
}

/* Section Architectural Rhythm */
.section {
  padding-block: var(--layout-section-spacing);
}

.section:first-child {
  padding-block-start: 0;
}

.section:last-child {
  padding-block-end: 0;
}

/* Header & Navigation */
.site-header {
  background-color: var(--color-surface);
  border-block-end: 1px solid var(--color-border);
  position: sticky;
  inset-block-start: 0;
  z-index: 100;
  transition: box-shadow var(--transition-normal), background-color var(--transition-fast), border-color var(--transition-fast);
}

.site-header.is-scrolled {
  box-shadow: 0 4px 20px -2px rgba(10, 26, 51, 0.06);
}

[data-theme="dark"] .site-header.is-scrolled {
  box-shadow: 0 4px 24px -2px rgba(0, 0, 0, 0.55);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-block: var(--space-4);
  gap: var(--space-4);
}

.brand-wrapper {
  display: inline-flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  transition: opacity var(--transition-fast);
}

.brand-wrapper:hover {
  opacity: 0.9;
}

.brand-emblem {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.brand-text {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 1px;
}

.brand-title {
  font-family: var(--font-heading);
  font-size: var(--text-xl);
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--color-brand);
  line-height: 1.1;
  text-decoration: none;
}

.brand-wordmark {
  display: inline-flex;
  align-items: center;
  letter-spacing: 0.14em;
  font-weight: 700;
}

.brand-letters {
  letter-spacing: 0.16em;
}

.brand-emblem-o {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

.brand-o-svg {
  display: inline-block;
  color: var(--color-brand);
}

.brand-subtitle {
  font-size: 0.6875rem;
  color: var(--color-accent-gold);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  line-height: 1.2;
}

html[dir="rtl"] .brand-title {
  font-family: var(--font-persian);
  letter-spacing: normal;
}

html[dir="rtl"] .brand-subtitle {
  font-family: var(--font-persian);
  letter-spacing: normal;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  list-style: none;
}

.nav-link {
  color: var(--color-text);
  font-weight: 500;
  font-size: var(--text-sm);
  text-decoration: none;
  padding-block: var(--space-1);
  position: relative;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link[aria-current="page"] {
  color: var(--color-science);
}

.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  inset-block-end: -2px;
  inline-size: 100%;
  block-size: 2px;
  background-color: var(--color-science);
  border-radius: var(--radius-full);
}

.header-actions {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
}

.header-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Persian language switcher hidden from navbar per visual pass; routing & test infra preserved */
.header-controls .lang-switcher {
  display: none !important;
}

/* Switchers (No-JS accessible fallback using HTML form controls) */
.switcher-form {
  display: inline-flex;
  align-items: center;
  margin: 0;
}

.switcher-select {
  background-color: var(--color-surface);
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  transition: border-color var(--transition-fast);
}

.switcher-select:hover {
  border-color: var(--color-border-hover);
}

.switcher-btn {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  transition: all var(--transition-fast);
}

.switcher-btn:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--color-border-hover);
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.625rem 1.25rem;
  font-size: var(--text-sm);
  font-weight: 600;
  border-radius: var(--radius-sm);
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: all var(--transition-fast);
  white-space: nowrap;
  line-height: 1.25;
}

.btn:active {
  transform: translateY(0);
}

.btn-primary,
.btn-brand {
  background-color: var(--color-brand);
  color: var(--color-brand-contrast);
  border-color: var(--color-brand);
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover,
.btn-brand:hover {
  background-color: var(--color-brand-hover);
  color: var(--color-brand-contrast);
  border-color: var(--color-brand-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-secondary,
.btn-science {
  background-color: var(--color-science);
  color: #FFFFFF;
  border-color: var(--color-science);
  box-shadow: var(--shadow-sm);
}

.btn-secondary:hover,
.btn-science:hover {
  background-color: var(--color-science-hover);
  color: #FFFFFF;
  border-color: var(--color-science-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

.btn-accent {
  background-color: var(--color-accent-gold);
  color: #FFFFFF;
  border-color: var(--color-accent-gold);
  box-shadow: var(--shadow-sm);
}

.btn-accent:hover {
  background-color: var(--color-accent-gold-hover);
  color: #FFFFFF;
  border-color: var(--color-accent-gold-hover);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

.btn-outline:hover {
  background-color: var(--color-surface-hover);
  border-color: var(--color-border-hover);
  color: var(--color-brand);
  transform: translateY(-1px);
}

/* Cards & Layout Modules */
.card-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
  margin-block: var(--space-6);
}

@media (min-width: 640px) {
  .card-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .card-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  display: flex;
  flex-direction: column;
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.card:hover {
  background-color: var(--color-surface-hover);
  border-color: rgba(13, 148, 136, 0.28);
  box-shadow: 0 10px 24px -4px rgba(10, 26, 51, 0.07), 0 2px 6px -1px rgba(13, 148, 136, 0.05);
  transform: translateY(-2px);
}

[data-theme="dark"] .card {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme="dark"] .card:hover {
  background-color: #132238;
  background-image: linear-gradient(180deg, rgba(66, 214, 198, 0.04) 0%, rgba(19, 34, 56, 1) 100%);
  border-color: rgba(66, 214, 198, 0.28);
  box-shadow: 0 10px 24px -4px rgba(0, 0, 0, 0.5), 0 0 16px -2px rgba(66, 214, 198, 0.1);
}

.card-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-brand);
  margin-block-end: var(--space-2);
}

html[dir="rtl"] .card-title {
  font-family: var(--font-persian) !important;
  font-style: normal;
  letter-spacing: normal;
}

.card-desc {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: var(--leading-normal);
  flex-grow: 1;
}

/* Badges & Notices */
.badge {
  display: inline-flex;
  align-items: center;
  padding: 0.2rem 0.65rem;
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  line-height: 1.2;
}

html[dir="rtl"] .badge {
  letter-spacing: normal;
}

.badge-primary {
  background-color: rgba(10, 26, 51, 0.06);
  color: var(--color-brand);
  border: 1px solid rgba(10, 26, 51, 0.14);
}

[data-theme="dark"] .badge-primary {
  background-color: rgba(242, 238, 230, 0.08);
  color: var(--color-brand);
  border: 1px solid rgba(242, 238, 230, 0.18);
}

.badge-gold {
  background-color: rgba(138, 98, 36, 0.1);
  color: var(--color-accent-gold);
  border: 1px solid rgba(138, 98, 36, 0.25);
}

[data-theme="dark"] .badge-gold {
  background-color: rgba(212, 174, 114, 0.12);
  color: var(--color-accent-gold);
  border: 1px solid rgba(212, 174, 114, 0.28);
}

.badge-info {
  background-color: var(--color-info-bg);
  color: var(--color-info);
  border: 1px solid var(--color-border);
}

.badge-science {
  background-color: rgba(13, 148, 136, 0.1);
  color: var(--color-science);
  border: 1px solid rgba(13, 148, 136, 0.22);
}

[data-theme="dark"] .badge-science {
  background-color: rgba(66, 214, 198, 0.12);
  color: var(--color-science);
  border: 1px solid rgba(66, 214, 198, 0.25);
}

.card-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent-gold);
  margin-block-end: var(--space-2);
}

html[dir="rtl"] .card-tag {
  letter-spacing: normal;
}

.alert {
  padding: var(--space-4);
  border-radius: var(--radius-md);
  margin-block-end: var(--space-4);
  font-size: var(--text-sm);
  border: 1px solid transparent;
}

.alert-warning {
  background-color: var(--color-warning-bg);
  border-color: var(--color-warning);
  color: #78350F;
}

.alert-danger {
  background-color: var(--color-danger-bg);
  border-color: var(--color-danger);
  color: #7F1D1D;
}

/* Hero Section */
.hero,
.hero-section {
  padding-block: clamp(3rem, 6vw, 4.5rem) var(--space-10);
  border-block-end: 1px solid var(--color-border);
  position: relative;
  overflow: hidden;
}

/* Atmospheric Subtle Neural Background Motif (Hero & Approach Sections) */
.neural-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: hidden;
  pointer-events: none;
  user-select: none;
  z-index: 0;
  opacity: 0.75;
  transition: opacity var(--transition-normal);
}

[data-theme="dark"] .neural-bg {
  opacity: 0.9;
}

.neural-bg-svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transform: scaleX(-1);
  transform-origin: center center;
}

/* Connecting Axon Filaments */
.neural-bg-edge {
  stroke: rgba(13, 148, 136, 0.28);
  stroke-width: 1.25px;
  stroke-linecap: round;
  transition: stroke var(--transition-normal);
}

.neural-bg-edge-gold {
  stroke: rgba(197, 155, 39, 0.32);
  stroke-width: 1.25px;
  stroke-linecap: round;
  transition: stroke var(--transition-normal);
}

/* Synaptic Halo Rings */
.neural-bg-ring {
  stroke: rgba(13, 148, 136, 0.35);
  stroke-width: 1px;
  fill: none;
}

.neural-bg-ring-gold {
  stroke: rgba(197, 155, 39, 0.40);
  stroke-width: 1px;
  fill: none;
}

/* Synaptic Nodes */
.neural-bg-node {
  fill: #0D9488;
  opacity: 0.7;
  transition: fill var(--transition-normal), opacity var(--transition-normal);
}

.neural-bg-node-gold {
  fill: #C59B27;
  opacity: 0.8;
  transition: fill var(--transition-normal), opacity var(--transition-normal);
}

/* Traveling Information Pulses */
.neural-bg-signal {
  fill: #0D9488;
  filter: drop-shadow(0 0 3px rgba(13, 148, 136, 0.7));
  opacity: 0;
}

.neural-bg-signal-gold {
  fill: #C59B27;
  filter: drop-shadow(0 0 3px rgba(197, 155, 39, 0.7));
  opacity: 0;
}

/* Dark Theme Adjustments: Luminescent Scientific Network */
[data-theme="dark"] .neural-bg-edge {
  stroke: rgba(66, 214, 198, 0.28);
}

[data-theme="dark"] .neural-bg-edge-gold {
  stroke: rgba(229, 192, 123, 0.34);
}

[data-theme="dark"] .neural-bg-ring {
  stroke: rgba(66, 214, 198, 0.38);
}

[data-theme="dark"] .neural-bg-ring-gold {
  stroke: rgba(229, 192, 123, 0.45);
}

[data-theme="dark"] .neural-bg-node {
  fill: #42D6C6;
  opacity: 0.85;
  filter: drop-shadow(0 0 4px rgba(66, 214, 198, 0.5));
}

[data-theme="dark"] .neural-bg-node-gold {
  fill: #E5C07B;
  opacity: 0.9;
  filter: drop-shadow(0 0 4px rgba(229, 192, 123, 0.5));
}

[data-theme="dark"] .neural-bg-signal {
  fill: #5EEAD4;
  filter: drop-shadow(0 0 6px rgba(94, 234, 212, 0.95));
}

[data-theme="dark"] .neural-bg-signal-gold {
  fill: #FDE047;
  filter: drop-shadow(0 0 6px rgba(253, 224, 71, 0.95));
}

/* Atmospheric Radial Lighting for Depth */
[data-theme="dark"] .hero-section {
  background: radial-gradient(ellipse 70% 60% at 75% 45%, rgba(13, 148, 136, 0.06) 0%, rgba(7, 13, 24, 0) 70%),
              radial-gradient(ellipse 50% 50% at 20% 80%, rgba(212, 174, 114, 0.035) 0%, rgba(7, 13, 24, 0) 60%);
}

[data-theme="light"] .hero-section {
  background: radial-gradient(ellipse 70% 60% at 75% 45%, rgba(13, 148, 136, 0.035) 0%, rgba(250, 248, 245, 0) 70%),
              radial-gradient(ellipse 50% 50% at 20% 80%, rgba(138, 98, 36, 0.025) 0%, rgba(250, 248, 245, 0) 60%);
}

.hero-tag {
  color: var(--color-accent-gold);
  font-family: var(--font-mono);
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: var(--text-xs);
  margin-block-end: var(--space-3);
  display: inline-block;
}

.hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.25rem, 4.5vw, 3.5rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--color-brand);
  max-width: 860px;
  margin-block-end: var(--space-4);
}

html[dir="rtl"] .hero-title {
  font-family: var(--font-persian) !important;
  letter-spacing: normal;
  line-height: 1.35;
  font-weight: 700;
  font-style: normal;
}

.hero-lead,
.hero-subtitle {
  font-size: var(--text-lg);
  color: var(--color-muted);
  max-width: 720px;
  margin-block-end: var(--space-8);
  line-height: var(--leading-relaxed);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  align-items: center;
  margin-block-start: var(--space-2);
}

@media (min-width: 1024px) {
  .hero-actions {
    flex-wrap: nowrap;
    gap: 0.35rem;
    width: 100%;
  }

  .hero-actions .btn {
    white-space: nowrap;
    padding-inline: 0.72rem;
    font-size: 0.73rem;
    letter-spacing: -0.01em;
  }
}

@media (min-width: 1200px) {
  .hero-actions {
    gap: var(--space-2);
  }

  .hero-actions .btn {
    padding-inline: 0.85rem;
    font-size: 0.75rem;
  }
}

@media (min-width: 1360px) {
  .hero-actions {
    gap: var(--space-3);
  }

  .hero-actions .btn {
    padding-inline: 1rem;
    font-size: 0.8125rem;
  }
}

/* Hero Scientific Grid Layout */
.hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-8);
  align-items: center;
  position: relative;
  z-index: 1;
}

@media (min-width: 1024px) {
  .hero-grid {
    grid-template-columns: 1fr 400px;
    gap: var(--space-6);
  }
}

@media (min-width: 1200px) {
  .hero-grid {
    grid-template-columns: 1fr 480px;
    gap: var(--space-8);
  }
}

@media (min-width: 1280px) {
  .hero-grid {
    grid-template-columns: 1fr 540px;
    gap: var(--space-8);
  }
}

.hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  width: 100%;
  max-width: 560px;
  margin-inline: auto;
  margin-block-start: var(--space-6);
}

@media (min-width: 1024px) {
  .hero-visual {
    margin-block-start: 0;
    max-width: 560px;
  }
}

.hero-schematic-wrapper {
  width: 100%;
  max-width: 560px;
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
}

.hero-schematic-svg {
  width: 100%;
  height: auto;
  max-height: 480px;
  display: block;
  overflow: visible;
}

/* ================================================================= */
/* HERO EMBLEM: IDLE ORBITAL ROTATIONS */
/* ================================================================= */

@keyframes hero-spin-cw {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}

@keyframes hero-spin-ccw {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(-360deg);
  }
}

.hero-orbit-spin-cw {
  transform-origin: 260px 210px;
  animation: hero-spin-cw 75s linear infinite;
}

.hero-orbit-spin-ccw {
  transform-origin: 260px 210px;
  animation: hero-spin-ccw 90s linear infinite;
}

.hero-orbit-layer-5 {
  animation-duration: 110s;
}

.hero-orbit-layer-3 {
  animation-duration: 85s;
}

.hero-orbit-layer-2 {
  animation-duration: 60s;
}

/* Stationary elements during idle: diamond, axes, nodes, labels, core */
.hero-astroid,
.hero-axis-base,
.hero-ring-4,
.hero-quadrant-arc,
.hero-orbit-6 {
  pointer-events: none;
}

/* ================================================================= */
/* HERO EMBLEM: ACCESSIBLE INTERACTIVE HOVER / FOCUS EFFECTS */
/* ================================================================= */

.hero-interactive {
  cursor: pointer;
  outline: none;
  -webkit-tap-highlight-color: transparent;
}

/* Connecting axis glow line (hidden idle, glowing on hover/focus) */
.hero-axis-highlight {
  opacity: 0;
  pointer-events: none;
  transition: opacity 300ms ease, filter 300ms ease;
}

.hero-interactive:hover .hero-axis-highlight,
.hero-interactive:focus-visible .hero-axis-highlight {
  opacity: 1;
  filter: drop-shadow(0 0 6px var(--color-accent-gold));
}

/* Outer cardinal node enlargement (~1.12x) & glow */
.hero-node-mark {
  transition: transform 300ms cubic-bezier(0.2, 0, 0, 1), filter 300ms ease;
}

.hero-node-mark-top {
  transform-origin: 260px 80px;
}

.hero-node-mark-bottom {
  transform-origin: 260px 340px;
}

.hero-node-mark-left {
  transform-origin: 130px 210px;
}

.hero-node-mark-right {
  transform-origin: 390px 210px;
}

.hero-interactive:hover .hero-node-mark,
.hero-interactive:focus-visible .hero-node-mark {
  transform: scale(1.12);
  filter: drop-shadow(0 0 8px rgba(197, 165, 114, 0.7));
}

/* Accessible keyboard focus ring */
.hero-interactive:focus-visible .hero-node-mark circle:first-child,
.hero-interactive:focus-visible .hero-core-mark circle:first-child {
  stroke: var(--color-accent-gold);
  stroke-width: 2.8px;
  filter: drop-shadow(0 0 6px var(--color-accent-gold));
}

/* Labels: calibrated typography and smooth rotation */
.hero-label {
  font-family: var(--font-mono);
  font-size: 9.5px;
  font-weight: 600;
  letter-spacing: 0.12em;
  fill: var(--color-muted);
  pointer-events: none;
  user-select: none;
  transition: transform 300ms cubic-bezier(0.2, 0, 0, 1), fill 300ms ease, filter 300ms ease;
}

/* Top label: Clinical Insight */
.hero-label-top {
  transform-origin: 260px 38px;
  fill: var(--color-accent-gold);
}

.hero-node-group-top:hover .hero-label-top,
.hero-node-group-top:focus-visible .hero-label-top {
  transform: scale(1.08);
  fill: var(--color-accent-gold);
  filter: drop-shadow(0 0 5px rgba(197, 165, 114, 0.6));
}

/* Bottom label: Practice Translation */
.hero-label-bottom {
  transform-origin: 260px 388px;
  fill: var(--color-accent-gold);
}

.hero-node-group-bottom:hover .hero-label-bottom,
.hero-node-group-bottom:focus-visible .hero-label-bottom {
  transform: scale(1.08);
  fill: var(--color-accent-gold);
  filter: drop-shadow(0 0 5px rgba(197, 165, 114, 0.6));
}

/* Left label: AI & Informatics (idle vertical -90deg, hover/focus horizontal 0deg) */
.hero-label-left {
  transform: rotate(-90deg);
  transform-origin: 60px 214px;
}

.hero-node-group-left:hover .hero-label-left,
.hero-node-group-left:focus-visible .hero-label-left {
  transform: rotate(0deg);
  fill: var(--color-brand);
  filter: drop-shadow(0 0 5px rgba(197, 165, 114, 0.6));
}

/* Right label: Scientific Rigor (idle vertical 90deg, hover/focus horizontal 0deg) */
.hero-label-right {
  transform: rotate(90deg);
  transform-origin: 460px 214px;
}

.hero-node-group-right:hover .hero-label-right,
.hero-node-group-right:focus-visible .hero-label-right {
  transform: rotate(0deg);
  fill: var(--color-brand);
  filter: drop-shadow(0 0 5px rgba(197, 165, 114, 0.6));
}

/* Central Nucleus Core: hover/focus enlargement (~1.15x) & ring emphasis */
.hero-core-mark {
  transform-origin: 260px 210px;
  transition: transform 300ms cubic-bezier(0.2, 0, 0, 1), filter 300ms ease;
}

.hero-node-group-center:hover .hero-core-mark,
.hero-node-group-center:focus-visible .hero-core-mark {
  transform: scale(1.15);
  filter: drop-shadow(0 0 12px rgba(197, 165, 114, 0.85));
}

/* Surrounding orbital rings emphasize on center core hover/focus */
.hero-schematic-svg:has(.hero-node-group-center:hover) .hero-orbit,
.hero-schematic-svg:has(.hero-node-group-center:focus-visible) .hero-orbit {
  stroke: var(--color-accent-gold);
  stroke-opacity: 0.85;
  stroke-width: 1.6;
  filter: drop-shadow(0 0 3px rgba(197, 165, 114, 0.45));
}

/* ================================================================= */
/* ACCESSIBILITY: PREFERS-REDUCED-MOTION */
/* ================================================================= */

@media (prefers-reduced-motion: reduce) {
  .hero-orbit-spin-cw,
  .hero-orbit-spin-ccw {
    animation: none !important;
  }

  .hero-node-mark,
  .hero-label,
  .hero-core-mark,
  .hero-axis-highlight {
    transition-duration: 0.01ms !important;
  }
}

/* Process List (UI05: 8-Step Approach) */
.process-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
  list-style: none;
  margin-top: var(--space-6);
}

@media (min-width: 640px) {
  .process-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .process-list {
    grid-template-columns: repeat(4, 1fr);
  }
}

.process-step {
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  background-color: var(--color-surface);
  padding: var(--space-6);
  box-shadow: var(--shadow-card);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), border-color var(--transition-normal), box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.process-step:hover {
  transform: translateY(-3px);
  border-color: rgba(13, 148, 136, 0.35);
  box-shadow: 0 12px 28px -6px rgba(10, 26, 51, 0.08), 0 0 0 1px rgba(13, 148, 136, 0.15);
  background-color: var(--color-surface-hover);
}

[data-theme="dark"] .process-step {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

[data-theme="dark"] .process-step:hover {
  background-color: #132238;
  background-image: linear-gradient(180deg, rgba(66, 214, 198, 0.05) 0%, rgba(19, 34, 56, 1) 100%);
  border-color: rgba(66, 214, 198, 0.35);
  box-shadow: 0 14px 32px -6px rgba(0, 0, 0, 0.5), 0 0 20px -2px rgba(66, 214, 198, 0.12);
}

.process-step-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
  position: relative;
  z-index: 2;
}

.process-step-badge {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background-color: rgba(13, 148, 136, 0.09);
  color: var(--color-science);
  border: 1px solid rgba(13, 148, 136, 0.28);
  line-height: 1.2;
  text-transform: uppercase;
}

[data-theme="dark"] .process-step-badge {
  background-color: rgba(66, 214, 198, 0.12);
  color: var(--color-science);
  border-color: rgba(66, 214, 198, 0.35);
}

html[dir="rtl"] .process-step-badge {
  font-family: var(--font-persian);
  letter-spacing: normal;
  font-size: 0.75rem;
}

.process-step-watermark {
  position: absolute;
  inset-block-start: var(--space-2);
  inset-inline-end: var(--space-3);
  font-family: var(--font-heading);
  font-size: 3.25rem;
  font-weight: 800;
  line-height: 1;
  color: var(--color-text);
  opacity: 0.04;
  pointer-events: none;
  user-select: none;
  transition: opacity var(--transition-normal), transform var(--transition-normal), color var(--transition-normal);
  z-index: 1;
}

[data-theme="dark"] .process-step-watermark {
  opacity: 0.055;
}

.process-step:hover .process-step-watermark {
  opacity: 0.1;
  color: var(--color-science);
  transform: scale(1.04);
}

.process-step .card-title {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-brand);
  margin-bottom: var(--space-2);
  position: relative;
  z-index: 2;
  line-height: 1.3;
}

html[dir="rtl"] .process-step .card-title {
  font-family: var(--font-persian) !important;
  font-style: normal;
  letter-spacing: normal;
}

.process-step .card-desc {
  font-size: var(--text-sm);
  color: var(--color-muted);
  line-height: var(--leading-relaxed);
  margin-bottom: 0;
  position: relative;
  z-index: 2;
}

/* Fallback badge-science inside process-step */
.process-step .badge-science {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 700;
  min-width: 1.75rem;
  height: 1.75rem;
  padding: 0 0.5rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
}

/* ================================================================= */
/* PHILOSOPHY & PROGRESS VALUE SECTION (HOMEPAGE EDITORIAL) */
/* ================================================================= */

.philosophy-section {
  position: relative;
  overflow: hidden;
  padding-block: clamp(2.5rem, 5vw, 4rem);
  margin-block-end: var(--space-12);
  border-radius: var(--radius-xl);
  border: 1px solid var(--color-border);
  background: var(--color-surface);
}

.philosophy-inner {
  position: relative;
  z-index: 1;
  max-width: 1040px;
  margin-inline: auto;
  padding-inline: var(--space-4);
}

@media (min-width: 768px) {
  .philosophy-inner {
    padding-inline: var(--space-6);
  }
}

.philosophy-grid-3 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}

@media (min-width: 768px) {
  .philosophy-grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.philosophy-grid-4 {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-5);
}

@media (min-width: 640px) {
  .philosophy-grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .philosophy-grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

.philosophy-card {
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  height: 100%;
}

.philosophy-cta-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: 600;
  padding-inline: var(--space-6);
  padding-block: 0.65rem;
}

/* ================================================================= */
/* FORM SYSTEM: REFINED EDITORIAL & ACCESSIBLE CONTROLS (WCAG 2.2 AA) */
/* ================================================================= */

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  margin-block-end: var(--space-5);
  position: relative;
}

.form-label {
  display: block;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  line-height: var(--leading-normal);
  letter-spacing: -0.01em;
}

html[dir="rtl"] .form-label {
  font-family: var(--font-persian);
  letter-spacing: normal;
}

/* Comprehensive form field inputs */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
input[type="number"],
input[type="password"],
input[type="search"],
input[type="file"],
textarea,
select,
.form-input,
.form-select,
.form-textarea {
  width: 100%;
  font-family: var(--font-body);
  font-size: var(--text-base);
  color: var(--color-text);
  background-color: var(--color-surface);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 0.75rem 1rem;
  line-height: 1.5;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast), background-color var(--transition-fast);
  box-sizing: border-box;
  -webkit-appearance: none;
  -moz-appearance: none;
  appearance: none;
}

/* Heights & line-heights */
input[type="text"],
input[type="email"],
input[type="tel"],
input[type="url"],
input[type="number"],
input[type="password"],
input[type="search"],
select,
.form-input,
.form-select {
  min-height: 2.875rem; /* 46px */
}

textarea,
.form-textarea {
  min-height: 8.5rem; /* 136px */
  resize: vertical;
  line-height: var(--leading-relaxed);
}

html[dir="rtl"] input,
html[dir="rtl"] textarea,
html[dir="rtl"] select,
html[dir="rtl"] .form-input,
html[dir="rtl"] .form-select,
html[dir="rtl"] .form-textarea {
  font-family: var(--font-persian);
}

/* Placeholders */
input::placeholder,
textarea::placeholder,
.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--color-muted);
  opacity: 0.65;
  font-size: var(--text-sm);
}

/* Hover State */
input[type="text"]:hover,
input[type="email"]:hover,
input[type="tel"]:hover,
input[type="url"]:hover,
input[type="number"]:hover,
input[type="password"]:hover,
input[type="search"]:hover,
textarea:hover,
select:hover,
.form-input:hover,
.form-select:hover,
.form-textarea:hover {
  border-color: var(--color-border-hover);
}

/* Focus State: Soft Teal Glow */
input[type="text"]:focus,
input[type="email"]:focus,
input[type="tel"]:focus,
input[type="url"]:focus,
input[type="number"]:focus,
input[type="password"]:focus,
input[type="search"]:focus,
textarea:focus,
select:focus,
.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  outline: none;
  border-color: var(--color-science);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.16);
  background-color: var(--color-surface);
}

/* Custom Select Arrow */
select,
.form-select {
  cursor: pointer;
  padding-inline-end: 2.5rem;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%23536275' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1rem 1rem;
}

html[dir="rtl"] select,
html[dir="rtl"] .form-select {
  background-position: left 1rem center;
  padding-inline-end: 1rem;
  padding-inline-start: 2.5rem;
}

/* File input */
input[type="file"],
.form-file {
  padding: 0.625rem 0.875rem;
  cursor: pointer;
  min-height: 2.875rem;
  background-color: var(--color-surface);
  border: 1.5px dashed var(--color-border);
}

input[type="file"]:hover,
.form-file:hover {
  border-color: var(--color-science);
}

/* Fieldset and Legend */
fieldset {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  margin-block-end: var(--space-8);
  background-color: var(--color-surface);
}

legend {
  font-family: var(--font-heading);
  font-size: var(--text-sm);
  font-weight: 700;
  color: var(--color-brand);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-inline: var(--space-3);
  border-radius: var(--radius-xs);
}

html[dir="rtl"] legend {
  font-family: var(--font-persian);
  letter-spacing: normal;
}

/* Dark Theme Form Controls */
[data-theme="dark"] input[type="text"],
[data-theme="dark"] input[type="email"],
[data-theme="dark"] input[type="tel"],
[data-theme="dark"] input[type="url"],
[data-theme="dark"] input[type="number"],
[data-theme="dark"] input[type="password"],
[data-theme="dark"] input[type="search"],
[data-theme="dark"] input[type="file"],
[data-theme="dark"] textarea,
[data-theme="dark"] select,
[data-theme="dark"] .form-input,
[data-theme="dark"] .form-select,
[data-theme="dark"] .form-textarea {
  background-color: rgba(15, 26, 44, 0.85);
  border-color: rgba(255, 255, 255, 0.12);
  color: var(--color-text);
}

[data-theme="dark"] input[type="text"]:hover,
[data-theme="dark"] input[type="email"]:hover,
[data-theme="dark"] input[type="tel"]:hover,
[data-theme="dark"] input[type="url"]:hover,
[data-theme="dark"] input[type="number"]:hover,
[data-theme="dark"] input[type="password"]:hover,
[data-theme="dark"] input[type="search"]:hover,
[data-theme="dark"] textarea:hover,
[data-theme="dark"] select:hover,
[data-theme="dark"] .form-input:hover,
[data-theme="dark"] .form-select:hover,
[data-theme="dark"] .form-textarea:hover {
  border-color: rgba(255, 255, 255, 0.22);
}

[data-theme="dark"] input[type="text"]:focus,
[data-theme="dark"] input[type="email"]:focus,
[data-theme="dark"] input[type="tel"]:focus,
[data-theme="dark"] input[type="url"]:focus,
[data-theme="dark"] input[type="number"]:focus,
[data-theme="dark"] input[type="password"]:focus,
[data-theme="dark"] input[type="search"]:focus,
[data-theme="dark"] textarea:focus,
[data-theme="dark"] select:focus,
[data-theme="dark"] .form-input:focus,
[data-theme="dark"] .form-select:focus,
[data-theme="dark"] .form-textarea:focus {
  background-color: #121F35;
  border-color: var(--color-science);
  box-shadow: 0 0 0 3px rgba(66, 214, 198, 0.22);
}

[data-theme="dark"] select,
[data-theme="dark"] .form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='16' height='16' viewBox='0 0 24 24' fill='none' stroke='%2396A3B5' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'%3E%3C/polyline%3E%3C/svg%3E");
}

[data-theme="dark"] fieldset {
  background-color: var(--color-surface);
  border-color: var(--color-border);
}

/* Footer Section */
.site-footer {
  margin-block-start: auto;
  background-color: var(--color-surface);
  border-block-start: 1px solid var(--color-border);
  padding-block: var(--space-10) var(--space-8);
}

.footer-top {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: var(--space-6);
  margin-block-end: var(--space-6);
}

.footer-brand p {
  color: var(--color-muted);
  font-size: var(--text-sm);
  max-width: 320px;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-8);
}

.footer-col h4 {
  font-size: var(--text-sm);
  font-weight: 700;
  margin-block-end: var(--space-3);
  color: var(--color-text);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.footer-links a {
  color: var(--color-muted);
  font-size: var(--text-sm);
  text-decoration: none;
}

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

.footer-bottom {
  padding-block-start: var(--space-6);
  border-block-start: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-muted);
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
  }
}

/* Subordinate institutional relationship statement (Website Features §3) */
.footer-institutional {
  font-size: var(--text-xs);
  color: var(--color-muted);
  font-weight: 400;
  opacity: 0.85;
}

/* Mobile responsive menu */
@media (max-width: 767px) {
  .header-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
    padding-block: var(--space-2);
    gap: 0;
  }

  .brand-wrapper {
    order: 1;
    flex: 0 1 auto;
    max-width: calc(100% - 136px);
    gap: var(--space-2);
  }

  .brand-title {
    font-size: 1.125rem;
    line-height: 1.1;
  }

  .brand-subtitle {
    font-size: 0.58rem;
    letter-spacing: 0.08em;
  }

  .header-actions {
    order: 2;
    display: inline-flex;
    align-items: center;
    gap: var(--space-1);
    flex: 0 0 auto;
    margin-inline-start: auto;
  }

  .header-actions .switcher-btn {
    padding: 0.35rem 0.55rem;
    font-size: 0.725rem;
    font-weight: 500;
  }

  .nav-toggle-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 0.35rem 0.55rem;
    font-size: 0.725rem;
    font-weight: 600;
  }

  .nav-toggle-btn[aria-expanded="true"] {
    background-color: var(--color-surface-hover);
    border-color: var(--color-science);
    color: var(--color-science);
  }

  #primary-navigation {
    order: 3;
    width: 100%;
    flex-basis: 100%;
  }

  .site-nav {
    display: none;
    width: 100%;
    flex-direction: column;
    align-items: stretch;
    background-color: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg);
    padding: var(--space-2);
    margin-block-start: var(--space-3);
    gap: 2px;
    transition: background-color var(--transition-fast), border-color var(--transition-fast);
  }

  .site-nav.is-open {
    display: flex;
    animation: mobileNavReveal 200ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
  }

  .site-nav li {
    width: 100%;
    list-style: none;
  }

  .site-nav .nav-link {
    display: block;
    width: 100%;
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-sm);
    font-weight: 500;
    color: var(--color-text);
    border-radius: var(--radius-sm);
    text-decoration: none;
    transition: background-color var(--transition-fast), color var(--transition-fast);
  }

  .site-nav .nav-link:hover,
  .site-nav .nav-link[aria-current="page"] {
    background-color: var(--color-surface-hover);
    color: var(--color-science);
  }

  .site-nav .nav-link[aria-current="page"]::after {
    display: none;
  }

  [data-theme="dark"] .site-nav {
    background-color: var(--color-surface);
    border-color: var(--color-border);
    box-shadow: 0 16px 36px -4px rgba(0, 0, 0, 0.65);
  }
}

@keyframes mobileNavReveal {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (min-width: 768px) {
  .nav-toggle-btn {
    display: none;
  }
}

/* ================================================================= */
/* MOTION ARCHITECTURE: RESTRAINED SCROLL REVEALS & CARD STAGGERING */
/* ================================================================= */

/* Default state: fully visible, accessible, 100% no-JS safe */
main#main-content .section,
.hero-content,
.card-grid > .card,
.philosophy-grid-3 > .card,
.philosophy-grid-4 > .card,
.process-list > .process-step,
.cms-narrative {
  transition: opacity 550ms cubic-bezier(0.16, 1, 0.3, 1),
              transform 550ms cubic-bezier(0.16, 1, 0.3, 1),
              border-color var(--transition-normal),
              box-shadow var(--transition-normal),
              background-color var(--transition-normal);
}

/* Enabled exclusively when motion.js initializes and marks root as motion-ready */
html.motion-ready main#main-content .section,
html.motion-ready .hero-content,
html.motion-ready .card-grid > .card,
html.motion-ready .philosophy-grid-3 > .card,
html.motion-ready .philosophy-grid-4 > .card,
html.motion-ready .process-list > .process-step,
html.motion-ready .cms-narrative {
  opacity: 0;
  transform: translateY(14px);
}

html.motion-ready main#main-content .section.is-revealed,
html.motion-ready .hero-content.is-revealed,
html.motion-ready .card-grid > .card.is-revealed,
html.motion-ready .philosophy-grid-3 > .card.is-revealed,
html.motion-ready .philosophy-grid-4 > .card.is-revealed,
html.motion-ready .process-list > .process-step.is-revealed,
html.motion-ready .cms-narrative.is-revealed {
  opacity: 1;
  transform: translateY(0);
}

/* Group stagger: 60ms cadence per child */
html.motion-ready .stagger-group > * {
  transition-delay: calc(var(--stagger-index, 0) * 60ms);
}

/* Respect user's motion preferences (WCAG 2.2 AA) */
@media (prefers-reduced-motion: reduce) {
  html.motion-ready main#main-content .section,
  html.motion-ready .hero-content,
  html.motion-ready .card-grid > .card,
  html.motion-ready .philosophy-grid-3 > .card,
  html.motion-ready .philosophy-grid-4 > .card,
  html.motion-ready .process-list > .process-step,
  html.motion-ready .cms-narrative {
    opacity: 1 !important;
    transform: none !important;
    transition: none !important;
  }
}