/* Tensorverse — brand-aligned tokens */
:root {
  --bg-deep: #0b0b23;
  --bg-elevated: #12123a;
  --mint: #89cfb6;
  --mint-dim: #6fb89f;
  --teal: #2c7a7b;
  --teal-bright: #3d9a9b;
  --text: #e8f4f0;
  --text-muted: #9ab8b0;
  --border-glass: rgba(137, 207, 182, 0.12);
  --glow: rgba(137, 207, 182, 0.15);
  --font-sans: "IBM Plex Sans", "IBM Plex Sans Arabic", system-ui, sans-serif;
  --font-display: "Exo 2", "IBM Plex Sans Arabic", system-ui, sans-serif;
  --radius: 14px;
  --radius-sm: 10px;
  --header-h: 72px;
  --transition: 0.22s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg-deep);
  min-height: 100vh;
}

[dir="rtl"] body {
  font-family: "IBM Plex Sans Arabic", "IBM Plex Sans", system-ui, sans-serif;
}

[dir="rtl"] .hero-title,
[dir="rtl"] .section-title,
[dir="rtl"] .eyebrow,
[dir="rtl"] .nav-list a,
[dir="rtl"] .btn {
  font-family: "IBM Plex Sans Arabic", "Exo 2", system-ui, sans-serif;
}

.grid-bg {
  position: fixed;
  inset: 0;
  z-index: -1;
  background-color: var(--bg-deep);
  background-image:
    linear-gradient(rgba(137, 207, 182, 0.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(137, 207, 182, 0.04) 1px, transparent 1px);
  background-size: 48px 48px;
  pointer-events: none;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.container {
  width: min(1120px, 100% - 2rem);
  margin-inline: auto;
}

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(11, 11, 35, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border-glass);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: var(--header-h);
  padding-block: 0.5rem;
}

.brand {
  display: flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.brand-logo {
  display: block;
  height: 48px;
  width: auto;
  max-width: min(200px, 42vw);
  object-fit: contain;
}

.nav {
  display: none;
}

.nav-list {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.nav-list a {
  font-family: var(--font-display);
  font-size: 0.9rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--text-muted);
  text-decoration: none;
  transition: color var(--transition);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--mint);
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
}

.lang-toggle {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  padding: 0.5rem 0.85rem;
  border-radius: var(--radius-sm);
  border: 1px solid var(--border-glass);
  background: rgba(44, 122, 123, 0.2);
  color: var(--mint);
  cursor: pointer;
  transition:
    background var(--transition),
    border-color var(--transition);
}

.lang-toggle:hover,
.lang-toggle:focus-visible {
  background: rgba(44, 122, 123, 0.35);
  border-color: rgba(137, 207, 182, 0.35);
  outline: none;
}

.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 10px;
  border: none;
  border-radius: var(--radius-sm);
  background: transparent;
  cursor: pointer;
  color: var(--mint);
}

.menu-bar {
  display: block;
  height: 2px;
  width: 100%;
  background: currentColor;
  border-radius: 1px;
  transition: transform var(--transition), opacity var(--transition);
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(2) {
  opacity: 0;
}

.menu-toggle[aria-expanded="true"] .menu-bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.mobile-nav {
  border-top: 1px solid var(--border-glass);
  padding: 1rem 1rem 1.25rem;
  background: rgba(11, 11, 35, 0.95);
}

.mobile-nav[hidden] {
  display: none;
}

.mobile-nav:not([hidden]) {
  display: block;
}

.mobile-nav-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.mobile-nav-list a {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--text);
  text-decoration: none;
  display: block;
  padding: 0.5rem 0;
}

.mobile-nav-list a:hover,
.mobile-nav-list a:focus-visible {
  color: var(--mint);
}

@media (min-width: 880px) {
  .nav {
    display: block;
  }

  .menu-toggle {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }

  .brand-logo {
    height: 52px;
  }
}

/* Hero */
.hero {
  position: relative;
  padding: clamp(3rem, 8vw, 5.5rem) 0 clamp(3.5rem, 10vw, 6rem);
  overflow: hidden;
}

.hero-inner {
  position: relative;
  max-width: 720px;
}

.hero-glow {
  position: absolute;
  top: -20%;
  inset-inline-start: -10%;
  width: 60%;
  max-width: 420px;
  aspect-ratio: 1;
  background: radial-gradient(
    circle,
    rgba(137, 207, 182, 0.18) 0%,
    transparent 70%
  );
  filter: blur(40px);
  pointer-events: none;
}

[dir="rtl"] .hero-glow {
  inset-inline-start: auto;
  inset-inline-end: -10%;
}

.eyebrow {
  font-family: var(--font-display);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--teal-bright);
  margin: 0 0 1rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5vw, 2.75rem);
  font-weight: 700;
  line-height: 1.15;
  margin: 0 0 1.25rem;
  background: linear-gradient(105deg, var(--mint) 0%, var(--teal-bright) 55%, var(--mint-dim) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-lead {
  margin: 0 0 2rem;
  font-size: 1.05rem;
  color: var(--text-muted);
  max-width: 560px;
}

.hero-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  padding: 0.85rem 1.35rem;
  border-radius: var(--radius-sm);
  border: 1px solid transparent;
  cursor: pointer;
  transition:
    background var(--transition),
    color var(--transition),
    border-color var(--transition),
    box-shadow var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--mint) 0%, var(--teal) 100%);
  color: var(--bg-deep);
  box-shadow: 0 0 24px var(--glow);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  box-shadow: 0 0 36px rgba(137, 207, 182, 0.35);
  filter: brightness(1.05);
  outline: none;
}

.btn-ghost {
  background: rgba(137, 207, 182, 0.08);
  border-color: var(--border-glass);
  color: var(--mint);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(137, 207, 182, 0.14);
  border-color: rgba(137, 207, 182, 0.28);
  outline: none;
}

/* Sections */
.section {
  padding: clamp(3rem, 6vw, 5rem) 0;
}

.section-alt {
  background: linear-gradient(
    180deg,
    rgba(18, 18, 58, 0.5) 0%,
    transparent 100%
  );
  border-block: 1px solid var(--border-glass);
}

.section-title {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  font-weight: 700;
  color: var(--mint);
  margin: 0 0 1rem;
  letter-spacing: 0.02em;
}

.section-intro {
  margin: 0 0 2rem;
  color: var(--text-muted);
  max-width: 720px;
  font-size: 1.05rem;
}

.cards {
  display: grid;
  gap: 1.25rem;
}

@media (min-width: 700px) {
  .cards-3 {
    grid-template-columns: repeat(3, 1fr);
  }
}

.card {
  border-radius: var(--radius);
  padding: 1.5rem 1.35rem;
}

.card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--mint);
  margin: 0 0 0.65rem;
}

.card p {
  margin: 0;
  color: var(--text-muted);
  font-size: 0.95rem;
}

.glass {
  background: rgba(18, 18, 58, 0.55);
  border: 1px solid var(--border-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.25);
}

.universe-card {
  --corner: 100% 0%;
  background: linear-gradient(
    145deg,
    rgba(44, 122, 123, 0.15) 0%,
    rgba(18, 18, 58, 0.65) 50%
  );
  border: 1px solid var(--border-glass);
  position: relative;
  overflow: hidden;
}

.universe-card::before {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(
    circle at var(--corner, 100% 0%),
    rgba(137, 207, 182, 0.08) 0%,
    transparent 55%
  );
  pointer-events: none;
}

[dir="rtl"] .universe-card {
  --corner: 0% 0%;
}

.universe-icon {
  display: block;
  font-size: 1.25rem;
  color: var(--teal-bright);
  margin-bottom: 0.5rem;
  opacity: 0.9;
}

/* AI section */
.ai-layout {
  display: grid;
  gap: 2rem;
  align-items: start;
}

@media (min-width: 900px) {
  .ai-layout {
    grid-template-columns: 1.2fr 0.85fr;
    gap: 2.5rem;
  }
}

.ai-list {
  margin: 0;
  padding-inline-start: 1.25rem;
  color: var(--text-muted);
}

[dir="rtl"] .ai-list {
  padding-inline-start: 0;
  padding-inline-end: 1.25rem;
}

.ai-list li {
  margin-bottom: 1rem;
}

.ai-list li:last-child {
  margin-bottom: 0;
}

.ai-list strong {
  color: var(--text);
  font-weight: 600;
}

.ai-panel {
  padding: 1.75rem;
  border-radius: var(--radius);
  border: 1px solid rgba(137, 207, 182, 0.2);
  box-shadow: 0 0 40px rgba(44, 122, 123, 0.12);
}

.ai-panel-label {
  font-family: var(--font-display);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--teal-bright);
  margin: 0 0 0.75rem;
}

.ai-panel-text {
  margin: 0;
  color: var(--text);
  font-size: 1rem;
  line-height: 1.7;
}

/* CTA */
.section-cta {
  padding-bottom: clamp(3.5rem, 8vw, 5rem);
}

.cta-inner {
  text-align: center;
  padding: clamp(2rem, 5vw, 3rem);
  border-radius: var(--radius);
  max-width: 640px;
  margin-inline: auto;
}

.cta-inner .section-title {
  margin-bottom: 0.75rem;
}

.cta-text {
  margin: 0 0 1.5rem;
  color: var(--text-muted);
}

.cta-note {
  margin: 1rem 0 0;
  font-size: 0.8rem;
  color: var(--text-muted);
  opacity: 0.85;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border-glass);
  padding: 1.5rem 0 2rem;
}

.footer-inner {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  text-align: center;
}

@media (min-width: 600px) {
  .footer-inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    text-align: unset;
  }
}

.footer-brand {
  margin: 0;
  font-size: 0.9rem;
  color: var(--text-muted);
}

.footer-tagline {
  margin: 0;
  font-family: var(--font-display);
  font-size: 0.85rem;
  color: var(--mint);
  opacity: 0.85;
}

/* Focus visibility */
a:focus-visible,
button:focus-visible {
  outline: 2px solid var(--mint);
  outline-offset: 3px;
}