:root {
  --bg-primary: #000000;
  --bg-secondary: #07090b;
  --bg-card: #0c0f12;
  --text-primary: #ffffff;
  --text-secondary: #d1dbe5;
  --text-muted: #7d8b99;
  --accent: #ecd69a;
  --accent-cyan: #6dd0ff;
  --border-color: rgba(255, 255, 255, 0.08);
  --border-accent: rgba(236, 214, 154, 0.25);

  --font-mono: 'Space Mono', Consolas, monospace;
  --font-sans: 'Outfit', sans-serif; /* overridden to Cairo on [dir="rtl"], see bottom of file */
  --transition: all 0.4s cubic-bezier(0.16, 1, 0.3, 1);
  --transition-slow: all 0.8s cubic-bezier(0.16, 1, 0.3, 1);
}

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

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--bg-primary);
  color: var(--text-secondary);
  font-family: var(--font-sans);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent);
  color: var(--bg-primary);
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
  background: var(--border-accent);
  border-radius: 3px;
}

/* Animations */
@keyframes pulseGlow {

  0%,
  100% {
    opacity: 0.8;
    box-shadow: 0 0 10px rgba(236, 214, 154, 0.2);
  }

  50% {
    opacity: 1;
    box-shadow: 0 0 20px rgba(236, 214, 154, 0.4);
  }
}

@keyframes bounceSlow {

  0%,
  100% {
    transform: translateY(0);
  }

  50% {
    transform: translateY(6px);
  }
}

/* Layout Utilities */
.grid-container {
  display: grid;
  grid-template-columns: minmax(1.5rem, 1fr) minmax(auto, 1200px) minmax(1.5rem, 1fr);
  width: 100%;
}

.grid-content {
  grid-column: 2;
  width: 100%;
  position: relative;
  z-index: 2;
}

/* Common Section Styling */
section {
  padding: 8rem 0;
  border-bottom: 1px solid var(--border-color);
  position: relative;
}

.section-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--accent);
  margin-bottom: 4rem;
  display: flex;
  align-items: center;
  gap: 1rem;
}

.section-label::after {
  content: '';
  height: 1px;
  flex-grow: 1;
  background: linear-gradient(90deg, var(--border-accent), transparent);
}

[dir="rtl"] .section-label::after {
  background: linear-gradient(270deg, var(--border-accent), transparent);
}

.section-title {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.02em;
  line-height: 1.15;
  margin-bottom: 1rem;
}

.section-description {
  font-size: 1.15rem;
  color: var(--text-muted);
  max-width: 55ch;
  font-weight: 300;
}

.section-actions {
  margin-top: 4rem;
  display: flex;
  justify-content: center;
}

/* --- BUTTONS --- */
.btn-primary,
.btn-secondary,
.btn-book-cta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 1.1rem 2.2rem;
  text-decoration: none;
  cursor: pointer;
  transition: var(--transition);
  border: 1px solid;
  border-radius: 4px;
}

.btn-primary {
  background: var(--accent);
  color: var(--bg-primary);
  border-color: var(--accent);
  font-weight: 700;
}

.btn-primary:hover {
  background: transparent;
  color: var(--accent);
  box-shadow: 0 0 25px rgba(236, 214, 154, 0.25);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-2px);
}

/* --- GLOBAL NAV (language switcher, both pages) --- */
.global-nav {
  position: absolute;
  top: 2rem;
  inset-inline-start: 2rem;
  inset-inline-end: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 40;
}

.nav-home {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  font-weight: 600;
  transition: var(--transition);
}

.nav-home:hover {
  color: var(--accent);
}

.lang-toggle {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-secondary);
  border: 1px solid var(--border-color);
  padding: 0.5rem 1.2rem;
  background: rgba(12, 15, 18, 0.6);
  backdrop-filter: blur(8px);
  transition: var(--transition);
  border-radius: 4px;
  text-decoration: none;
}

.lang-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}

/* --- HERO --- */
.hero-section {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 700px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background-color: var(--bg-primary);
  overflow: hidden;
  padding: 2rem;
  border-bottom: 1px solid var(--border-color);
}

#kinetic-canvas {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 1;
  pointer-events: none;
}

.hero-glow {
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at center, rgba(109, 208, 255, 0.04) 0%, transparent 60%);
  z-index: 2;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 3;
  text-align: center;
  max-width: 850px;
  width: 100%;
}

.terminal-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  border: 1px solid var(--border-accent);
  background: rgba(236, 214, 154, 0.06);
  padding: 0.4rem 1rem;
  border-radius: 999px;
  letter-spacing: 0.1em;
  margin-bottom: 2.5rem;
  animation: pulseGlow 4s infinite ease-in-out;
}

.terminal-badge::before {
  content: '';
  width: 6px;
  height: 6px;
  background-color: var(--accent);
  border-radius: 50%;
  display: inline-block;
}

.hero-title {
  font-size: clamp(3rem, 9vw, 6.5rem);
  font-weight: 800;
  color: var(--text-primary);
  letter-spacing: -0.03em;
  line-height: 1.05;
  margin-bottom: 1.5rem;
  text-shadow: 0 0 40px rgba(0, 0, 0, 0.8);
}

.hero-subheadline {
  font-family: var(--font-mono);
  font-size: clamp(0.9rem, 2vw, 1.2rem);
  color: var(--accent-cyan);
  letter-spacing: 0.05em;
  margin-bottom: 2rem;
  font-weight: 400;
}

.hero-description {
  font-size: clamp(1.1rem, 2.5vw, 1.45rem);
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.6;
  max-width: 38ch;
  margin: 0 auto 3.5rem;
}

.hero-actions {
  display: flex;
  gap: 1.5rem;
  justify-content: center;
  flex-wrap: wrap;
}

.scroll-indicator {
  position: absolute;
  bottom: 2.5rem;
  left: 50%;
  transform: translateX(-50%);
  width: 26px;
  height: 42px;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  z-index: 3;
}

.scroll-dot {
  display: block;
  width: 4px;
  height: 8px;
  background-color: var(--text-muted);
  border-radius: 2px;
  margin: 6px auto 0;
  animation: bounceSlow 2s infinite ease-in-out;
}

/* --- OPERATING SYSTEM --- */
.os-layout {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 4rem;
  align-items: start;
}

.os-headline h2 {
  font-size: clamp(2.2rem, 5vw, 3.8rem);
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.1;
  letter-spacing: -0.03em;
}

.highlight-text {
  color: var(--accent);
}

.systems-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 3rem;
}

.system-tag {
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
  padding: 1.2rem;
  background: var(--bg-card);
  text-align: center;
  transition: var(--transition);
  border-radius: 4px;
}

.system-tag:hover {
  border-color: var(--accent-cyan);
  color: var(--accent-cyan);
  background: rgba(109, 208, 255, 0.03);
}

.os-narrative {
  font-size: 1.2rem;
  font-weight: 300;
  color: var(--text-muted);
  line-height: 1.7;
}

.narrative-focus {
  color: var(--text-primary);
  font-weight: 500;
  margin-bottom: 0.5rem;
}

@media (max-width: 900px) {
  .os-layout {
    grid-template-columns: 1fr;
    gap: 3rem;
  }
}

/* --- FEATURED SIMULATIONS --- */
.simulations-header {
  margin-bottom: 4rem;
}

.audits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 2rem;
}

.audit-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
  border-radius: 4px;
}

.audit-card[data-target-book] {
  cursor: pointer;
}

.audit-card::before {
  content: '';
  position: absolute;
  top: 0;
  inset-inline-start: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: scaleX(0);
  transform-origin: left;
  transition: var(--transition);
}

[dir="rtl"] .audit-card::before {
  background: linear-gradient(270deg, var(--accent), transparent);
  transform-origin: right;
}

.audit-card:hover {
  border-color: rgba(255, 255, 255, 0.15);
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.4);
}

.audit-card:hover::before {
  transform: scaleX(1);
}

.audit-meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 1.5rem;
}

.audit-title {
  font-size: 1.5rem;
  color: var(--text-primary);
  margin-bottom: 1rem;
  font-weight: 700;
}

.audit-summary {
  font-size: 0.95rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* --- SELECTED FRAMEWORKS --- */
.frameworks-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
}

.framework-card {
  padding: 3rem 2rem;
  border-inline-start: 1px solid var(--border-accent);
  background: linear-gradient(90deg, rgba(236, 214, 154, 0.02), transparent);
}

[dir="rtl"] .framework-card {
  background: linear-gradient(270deg, rgba(236, 214, 154, 0.02), transparent);
}

.framework-title {
  font-family: var(--font-mono);
  font-size: 1.3rem;
  color: var(--accent);
  margin-bottom: 1.2rem;
}

.framework-description {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.6;
}

@media (max-width: 900px) {
  .frameworks-grid {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }
}

/* --- ABOUT --- */
.about-layout {
  display: grid;
  grid-template-columns: 1.2fr 1fr;
  gap: 5rem;
  align-items: center;
}

.about-body {
  font-size: 1.15rem;
  font-weight: 300;
  line-height: 1.8;
  color: var(--text-secondary);
}

.about-body p {
  margin-bottom: 1.5rem;
}

.highlight-quote {
  font-size: 1.5rem;
  font-weight: 500;
  color: var(--accent);
  border-inline-start: 2px solid var(--accent);
  padding-inline-start: 1.5rem;
  margin: 2rem 0;
  font-style: italic;
}

.about-metrics {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1.5rem;
}

.metric-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: var(--transition);
  border-radius: 4px;
}

.metric-card:hover {
  border-color: var(--border-accent);
}

.metric-value {
  font-size: 2.2rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
  line-height: 1;
}

.metric-label {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  line-height: 1.4;
}

@media (max-width: 900px) {
  .about-layout {
    grid-template-columns: 1fr;
    gap: 4rem;
  }
}

/* --- BOOKS: 3D CAROUSEL (shared by en.html and ar.html) --- */
.books-section {
  overflow: hidden;
}

.books-intro {
  margin-bottom: 3rem;
}

.books-3d-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 3rem;
}

.carousel-stage-container {
  position: relative;
  height: 640px;
  width: 100%;
  max-width: 620px;
  display: flex;
  justify-content: center;
  align-items: center;
  perspective: 1400px;
  user-select: none;
}

@media (max-width: 800px) {
  .carousel-stage-container {
    height: 460px;
    max-width: 420px;
  }
}

.carousel-3d-wheel {
  position: absolute;
  width: 320px;
  height: 470px;
  transform-style: preserve-3d;
  cursor: grab;
}

.carousel-3d-wheel:active {
  cursor: grabbing;
}

.carousel-3d-item {
  position: absolute;
  width: 320px;
  height: 470px;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  transform-style: preserve-3d;
  transition: transform 0.35s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.35s ease;
  backface-visibility: hidden;
  will-change: transform, opacity;
  .carousel-3d-item {
    width: 220px;
    height: 325px;
  }
}

.book-spine-3d {
  width: 100%;
  height: 100%;
  background: var(--bg-card);
  border: 1px solid var(--border-accent);
  border-radius: 4px;
  box-shadow: 0 15px 45px rgba(0, 0, 0, 0.6);
  overflow: hidden;
  position: relative;
  transition: box-shadow 0.3s ease;
}

.carousel-3d-item.active-item .book-spine-3d {
  box-shadow: 0 0 55px rgba(236, 214, 154, 0.28), 0 18px 45px rgba(0, 0, 0, 0.85);
}

.carousel-3d-item.active-item .book-spine-3d::before {
  content: '';
  position: absolute;
  inset: -12px;
  border-radius: 10px;
  background: radial-gradient(circle, rgba(236, 214, 154, 0.22), transparent 70%);
  filter: blur(18px);
  z-index: -1;
  pointer-events: none;
}

.book-spine-3d img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-spine-3d::after {
  content: '';
  position: absolute;
  top: 0;
  inset-inline-end: 0;
  width: 4px;
  height: 100%;
  background: rgba(255, 255, 255, 0.15);
  z-index: 5;
}

.carousel-drag-guide {
  position: absolute;
  bottom: 3.75rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  letter-spacing: 0.05em;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  pointer-events: none;
  text-align: center;
  white-space: nowrap;
}

.carousel-scrub-track {
  position: absolute;
  bottom: 1.75rem;
  left: 50%;
  transform: translateX(-50%);
  width: min(220px, 70%);
  height: 3px;
  background: var(--border-color);
  border-radius: 999px;
  pointer-events: none;
}

.carousel-scrub-thumb {
  position: absolute;
  top: 50%;
  width: 14px;
  height: 14px;
  background: var(--accent);
  border-radius: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 10px rgba(236, 214, 154, 0.5);
  transition: left 0.1s linear;
}

.book-details-pane {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2rem 2.5rem;
  border-radius: 8px;
  display: grid;
  grid-template-columns: 1fr 180px;
  grid-auto-rows: auto;
  gap: 1rem 2rem;
  align-items: center;
  width: 100%;
  max-width: 980px;
  position: relative;
}

.book-details-pane::before {
  content: '';
  position: absolute;
  top: 0;
  inset-inline-start: 0;
  width: 100%;
  height: 3px;
  background: var(--accent);
  border-radius: 8px 8px 0 0;
}

.pane-heading {
  grid-column: 1 / 2;
}

.pane-meta {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  letter-spacing: 0.08em;
  margin-bottom: 0.25rem;
}

.pane-title {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  line-height: 1.15;
  margin: 0;
  word-break: break-word;
}

.pane-title-sub {
  display: block;
  font-size: 0.85rem;
  font-family: var(--font-mono);
  font-weight: 400;
  color: var(--text-muted);
  margin-top: 0.3rem;
}

.pane-description {
  font-size: 0.98rem;
  color: var(--text-secondary);
  font-weight: 300;
  line-height: 1.6;
  grid-column: 1 / 2;
  max-width: 64ch;
}

.book-details-pane .btn-primary,
#paneCTA {
  grid-column: 2 / 3;
  justify-self: center;
  align-self: center;
  min-width: 150px;
}

.book-details-pane .btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.9rem 1.2rem;
}

@media (max-width: 800px) {
  .book-details-pane {
    grid-template-columns: 1fr;
    gap: 0.75rem;
    padding: 1.5rem 1.25rem;
    max-width: 100%;
  }

  .book-details-pane .btn-primary,
  #paneCTA {
    grid-column: 1 / 2;
    justify-self: start;
    width: auto;
  }
}

@media (max-width: 800px) {
  .carousel-stage-container {
    height: 380px;
  }
}

/* --- READER REACTIONS --- */
.reactions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 2rem;
}

.reaction-card {
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  padding: 2.5rem;
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  transition: var(--transition);
  border-radius: 4px;
}

.reaction-card:hover {
  border-color: var(--border-accent);
}

.reaction-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 1.5rem;
}

.reaction-tag {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-cyan);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.reaction-source {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

.reaction-text {
  font-size: 1.1rem;
  font-style: italic;
  line-height: 1.6;
  color: var(--text-primary);
  margin-bottom: 1.5rem;
}

.reaction-book-link {
  font-size: 0.85rem;
  color: var(--accent);
  border-top: 1px dashed var(--border-color);
  padding-top: 1rem;
  margin-top: auto;
}

.featured-reaction {
  grid-column: span 2;
  border-color: var(--border-accent);
}

@media (max-width: 900px) {
  .featured-reaction {
    grid-column: span 1;
  }
}

/* --- CURRENT INVESTIGATIONS --- */
.investigations-layout {
  max-width: 900px;
}

.questions-list {
  display: flex;
  flex-direction: column;
  margin: 4rem 0;
}

.question-item {
  display: flex;
  gap: 2.5rem;
  padding: 2.5rem 0;
  border-bottom: 1px solid var(--border-color);
  align-items: flex-start;
}

.question-item:first-child {
  padding-top: 0;
}

.question-number {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--accent-cyan);
  font-weight: bold;
  opacity: 0.8;
  padding-top: 0.2rem;
}

.question-item .question-text {
  font-size: clamp(1.2rem, 3vw, 1.6rem);
  font-weight: 300;
  color: var(--text-primary);
  line-height: 1.4;
}

/* --- FOOTER --- */
.section-footer {
  padding: 6rem 0;
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 4rem;
  border-top: 1px solid var(--border-color);
  border-bottom: none;
}

.footer-logo {
  font-size: 1.6rem;
  font-weight: 800;
  color: var(--text-primary);
  margin-bottom: 1rem;
}

.footer-desc {
  font-size: 0.95rem;
  color: var(--text-muted);
  max-width: 40ch;
  line-height: 1.6;
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 2.5rem;
}

.nav-group {
  display: flex;
  flex-direction: column;
  gap: 0.8rem;
}

.nav-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-transform: uppercase;
  color: var(--accent);
  letter-spacing: 0.1em;
  margin-bottom: 0.5rem;
}

.nav-group a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 0.95rem;
  transition: var(--transition);
}

.nav-group a:hover {
  color: var(--text-primary);
}

.footer-bottom {
  grid-column: span 2;
  border-top: 1px solid var(--border-color);
  padding-top: 2rem;
  margin-top: 2rem;
}

.copyright {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
}

@media (max-width: 800px) {
  .section-footer {
    grid-template-columns: 1fr;
    gap: 3rem;
  }

  .footer-bottom {
    grid-column: span 1;
  }
}

/* --- RTL: language-level overrides only (font + the handful of properties
   logical properties don't cover — gradients, box-shadow direction) --- */
[dir="rtl"] {
  --font-sans: 'Cairo', sans-serif;
}

[dir="rtl"] body {
  line-height: 1.7;
}