/* ============================================
   NEBIA — Landing Page Styles
   ============================================ */

/* --- CSS Custom Properties --- */
:root {
  --color-bg-primary: #0A0D12;
  --color-bg-secondary: #111720;
  --color-gold: #E8B94F;
  --color-gold-light: #F4D9A0;
  --color-gold-pale: #FFF1D6;
  --color-gray: #8E95A3;
  --color-gray-dark: #5A6170;
  --color-terracotta: #CF5C36;
  --color-blue: #7B9FCC;
  --color-teal: #6DBFA8;
  --color-white: #FFFFFF;

  --font-heading: 'Georgia', 'Times New Roman', serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'Consolas', 'Courier New', monospace;

  --max-width: 1200px;
  --nav-height: 72px;
  --section-padding: 100px 0;
  --border-radius: 12px;

  --transition-base: 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--color-bg-primary);
  color: var(--color-gray);
  line-height: 1.7;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

a {
  text-decoration: none;
  color: inherit;
  transition: color var(--transition-base);
}

ul, ol {
  list-style: none;
}

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

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Typography --- */
h1, h2, h3, h4 {
  font-family: var(--font-heading);
  color: var(--color-gold);
  font-weight: 400;
  line-height: 1.2;
}

h1 {
  font-size: clamp(3rem, 8vw, 6rem);
  letter-spacing: -0.02em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  margin-bottom: 16px;
}

h3 {
  font-size: clamp(1.25rem, 2.5vw, 1.5rem);
  margin-bottom: 12px;
}

h4 {
  font-size: 1.1rem;
  color: var(--color-gold-light);
}

.section-label {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--color-gray-dark);
  margin-bottom: 8px;
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--color-gray);
  max-width: 600px;
  margin-bottom: 60px;
}

/* --- Navigation --- */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: rgba(10, 13, 18, 0.9);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  z-index: 1000;
  border-bottom: 1px solid rgba(232, 185, 79, 0.08);
  transition: background var(--transition-base);
}

.nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

.nav-brand {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  color: var(--color-gold);
  letter-spacing: 0.05em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links a {
  font-size: 0.9rem;
  color: var(--color-gray);
  transition: color var(--transition-base);
  position: relative;
}

.nav-links a:hover {
  color: var(--color-gold-light);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--color-gold);
  transition: width var(--transition-base);
}

.nav-links a:hover::after {
  width: 100%;
}

.nav-cta {
  font-size: 0.85rem !important;
  padding: 8px 20px;
  border: 1px solid var(--color-gold);
  border-radius: 6px;
  color: var(--color-gold) !important;
  transition: all var(--transition-base) !important;
}

.nav-cta:hover {
  background: var(--color-gold);
  color: var(--color-bg-primary) !important;
}

.nav-cta::after {
  display: none !important;
}

/* Mobile nav toggle */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.nav-toggle span {
  display: block;
  width: 24px;
  height: 2px;
  background: var(--color-gold-light);
  border-radius: 2px;
  transition: all var(--transition-base);
}

.nav-toggle.active span:nth-child(1) {
  transform: rotate(45deg) translate(5px, 5px);
}

.nav-toggle.active span:nth-child(2) {
  opacity: 0;
}

.nav-toggle.active span:nth-child(3) {
  transform: rotate(-45deg) translate(5px, -5px);
}

/* --- Hero --- */
.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  position: relative;
  padding-top: var(--nav-height);
}

.hero-content {
  position: relative;
  z-index: 1;
}

.hero h1 {
  margin-bottom: 24px;
}

.hero-tagline {
  font-family: var(--font-heading);
  font-size: clamp(1.1rem, 2.5vw, 1.5rem);
  color: var(--color-gold-light);
  font-style: italic;
  margin-bottom: 40px;
  opacity: 0.9;
}

.hero-date {
  font-size: 0.85rem;
  color: var(--color-gray-dark);
}

.hero-glow {
  position: absolute;
  width: 600px;
  height: 600px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(232, 185, 79, 0.06) 0%, transparent 70%);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  pointer-events: none;
}

.scroll-indicator {
  position: absolute;
  bottom: 40px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--color-gray-dark);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  animation: scrollBounce 2s infinite;
}

.scroll-indicator svg {
  width: 20px;
  height: 20px;
  stroke: var(--color-gray-dark);
}

@keyframes scrollBounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(8px); }
}

/* --- Section shared --- */
.section {
  padding: var(--section-padding);
}

.section--alt {
  background: var(--color-bg-secondary);
}

.section-header {
  margin-bottom: 60px;
}

/* --- Mission Section --- */
.mission-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
}

.mission-column h3 {
  font-size: 1.3rem;
  margin-bottom: 32px;
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(232, 185, 79, 0.15);
}

.mission-item {
  display: flex;
  gap: 16px;
  margin-bottom: 28px;
}

.mission-item .icon {
  flex-shrink: 0;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(255, 255, 255, 0.04);
}

.mission-item .icon svg {
  width: 22px;
  height: 22px;
}

.mission-item h4 {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-gold-light);
  margin-bottom: 4px;
}

.mission-item p {
  font-size: 0.9rem;
  color: var(--color-gray);
  line-height: 1.5;
}

/* --- Activities --- */
.activities-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.activity-card {
  padding: 40px 32px;
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all var(--transition-base);
  cursor: pointer;
  text-align: center;
}

.activity-card:hover {
  transform: translateY(-4px);
  border-color: rgba(232, 185, 79, 0.15);
  background: rgba(255, 255, 255, 0.05);
}

.activity-card .icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 16px;
}

.activity-card .icon svg {
  width: 32px;
  height: 32px;
}

.activity-card--blue .icon { background: rgba(123, 159, 204, 0.15); }
.activity-card--terracotta .icon { background: rgba(207, 92, 54, 0.15); }
.activity-card--teal .icon { background: rgba(109, 191, 168, 0.15); }

.activity-card h3 {
  color: var(--color-gold-light);
  margin-bottom: 8px;
}

.activity-card p {
  font-size: 0.9rem;
  color: var(--color-gray);
}

/* --- Marty AI --- */
.marty-pillars {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-bottom: 80px;
}

.pillar {
  padding: 32px 24px;
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  text-align: center;
  transition: all var(--transition-base);
}

.pillar:hover {
  border-color: rgba(207, 92, 54, 0.2);
  background: rgba(207, 92, 54, 0.04);
}

.pillar .icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(207, 92, 54, 0.12);
}

.pillar .icon svg {
  width: 28px;
  height: 28px;
}

.pillar h4 {
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  margin-bottom: 8px;
}

.pillar p {
  font-size: 0.85rem;
  color: var(--color-gray);
  line-height: 1.5;
}

/* Cortex subsection */
.cortex {
  padding: 48px;
  border-radius: var(--border-radius);
  background: linear-gradient(135deg, rgba(232, 185, 79, 0.06), rgba(207, 92, 54, 0.04));
  border: 1px solid rgba(232, 185, 79, 0.1);
}

.cortex h3 {
  font-size: 1.5rem;
  margin-bottom: 8px;
}

.cortex .cortex-subtitle {
  font-size: 0.9rem;
  color: var(--color-gray-dark);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 20px;
}

.cortex p {
  font-size: 1rem;
  color: var(--color-gray);
  max-width: 700px;
  line-height: 1.7;
}

.cortex-features {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-top: 32px;
}

.cortex-feature {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-gold-light);
}

.cortex-feature .arrow {
  color: var(--color-gold);
  font-weight: bold;
}

/* --- Expertise --- */
.expertise-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.expertise-card {
  padding: 40px 32px;
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all var(--transition-base);
}

.expertise-card:hover {
  border-color: rgba(123, 159, 204, 0.2);
  background: rgba(123, 159, 204, 0.04);
}

.expertise-card .icon {
  width: 56px;
  height: 56px;
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(123, 159, 204, 0.12);
}

.expertise-card .icon svg {
  width: 28px;
  height: 28px;
}

.expertise-card h3 {
  color: var(--color-gold-light);
}

.expertise-card p {
  font-size: 0.9rem;
  color: var(--color-gray);
}

/* --- Formation --- */
.formation-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}

.formation-card {
  padding: 48px 40px;
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all var(--transition-base);
}

.formation-card:hover {
  border-color: rgba(109, 191, 168, 0.2);
  background: rgba(109, 191, 168, 0.04);
}

.formation-card .icon {
  width: 56px;
  height: 56px;
  margin-bottom: 24px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 14px;
  background: rgba(109, 191, 168, 0.12);
}

.formation-card .icon svg {
  width: 28px;
  height: 28px;
}

.formation-card h3 {
  color: var(--color-gold-light);
  margin-bottom: 12px;
}

.formation-card p {
  font-size: 0.95rem;
  color: var(--color-gray);
  line-height: 1.7;
}

/* --- Use Cases --- */
.usecases-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
}

.usecase-card {
  padding: 36px 32px;
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.06);
  transition: all var(--transition-base);
}

.usecase-card:hover {
  border-color: rgba(232, 185, 79, 0.12);
}

.usecase-card h3 {
  color: var(--color-gold);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 12px;
}

.usecase-card h3 .icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 10px;
  background: rgba(232, 185, 79, 0.1);
}

.usecase-card h3 .icon svg {
  width: 20px;
  height: 20px;
}

.usecase-list {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.usecase-list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-gray);
  line-height: 1.4;
}

.usecase-list li .arrow {
  color: var(--color-gold);
  flex-shrink: 0;
  margin-top: 2px;
}

/* --- Contact --- */
.contact-content {
  text-align: center;
  max-width: 700px;
  margin: 0 auto;
}

.contact-content h2 {
  margin-bottom: 12px;
}

.contact-content .tagline {
  font-family: var(--font-heading);
  font-style: italic;
  color: var(--color-gold-light);
  margin-bottom: 48px;
  font-size: 1.1rem;
}

.contact-cards {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
  margin-bottom: 40px;
}

.contact-card {
  padding: 32px;
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid rgba(255, 255, 255, 0.06);
}

.contact-card h4 {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-gold-light);
  margin-bottom: 16px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.contact-info a {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 0.9rem;
  color: var(--color-gray);
  transition: color var(--transition-base);
}

.contact-info a:hover {
  color: var(--color-gold-light);
}

.contact-info a svg {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.btn-primary {
  display: inline-block;
  padding: 14px 36px;
  background: var(--color-gold);
  color: var(--color-bg-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all var(--transition-base);
}

.btn-primary:hover {
  background: var(--color-gold-pale);
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(232, 185, 79, 0.2);
}

/* --- Footer --- */
.footer {
  padding: 40px 0;
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  text-align: center;
}

.footer p {
  font-size: 0.85rem;
  color: var(--color-gray-dark);
}

.footer .tagline {
  font-family: var(--font-heading);
  font-style: italic;
  color: var(--color-gray-dark);
  margin-top: 4px;
  font-size: 0.8rem;
}

/* ============================================
   RESPONSIVE
   ============================================ */

@media (max-width: 1024px) {
  .marty-pillars {
    grid-template-columns: repeat(2, 1fr);
  }

  .cortex-features {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  :root {
    --section-padding: 64px 0;
    --nav-height: 60px;
  }

  .nav-links {
    display: none;
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    background: rgba(10, 13, 18, 0.98);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 32px 24px;
    gap: 24px;
    border-bottom: 1px solid rgba(232, 185, 79, 0.08);
  }

  .nav-links.open {
    display: flex;
  }

  .nav-toggle {
    display: flex;
  }

  .hero h1 {
    font-size: clamp(2.5rem, 10vw, 4rem);
  }

  .mission-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }

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

  .marty-pillars {
    grid-template-columns: 1fr;
  }

  .cortex {
    padding: 32px 24px;
  }

  .cortex-features {
    grid-template-columns: 1fr;
  }

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

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

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

  .contact-cards {
    grid-template-columns: 1fr;
  }
}