/* ============================================
   LU Consulting Marketing Site — Styles
   ============================================ */

:root {
  --primary: #6366f1;
  --primary-light: #818cf8;
  --primary-dark: #4f46e5;
  --primary-glow: rgba(99, 102, 241, 0.4);
  --primary-subtle: rgba(99, 102, 241, 0.08);

  --bg: #0a0a1a;
  --bg-elevated: #111128;
  --bg-card: rgba(17, 17, 40, 0.7);
  --bg-card-hover: rgba(99, 102, 241, 0.06);

  --text: #f0f0f5;
  --text-secondary: rgba(240, 240, 245, 0.65);
  --text-muted: rgba(240, 240, 245, 0.4);

  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(99, 102, 241, 0.3);

  --radius: 16px;
  --radius-sm: 10px;
  --radius-xs: 6px;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

/* ============================================
   Reset & Base
   ============================================ */

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ============================================
   Typography
   ============================================ */

h1 {
  font-size: clamp(2.5rem, 5.5vw, 4.25rem);
  font-weight: 800;
  line-height: 1.08;
  letter-spacing: -0.03em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3rem);
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.025em;
}

h3 {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1.3;
}

.text-gradient {
  background: linear-gradient(135deg, #818cf8, #6366f1, #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin: 0 auto 64px;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.125rem;
  margin-top: 16px;
  line-height: 1.7;
}

.section-tag {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary-light);
  background: var(--primary-subtle);
  padding: 6px 16px;
  border-radius: 100px;
  margin-bottom: 20px;
}

/* ============================================
   Buttons
   ============================================ */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font);
  font-weight: 600;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.2s ease;
  border: none;
  font-size: 0.95rem;
  padding: 12px 28px;
  white-space: nowrap;
}

.btn-primary {
  background: var(--primary);
  color: white;
  box-shadow: 0 0 24px var(--primary-glow);
}

.btn-primary:hover {
  background: var(--primary-dark);
  box-shadow: 0 0 32px var(--primary-glow);
  transform: translateY(-1px);
}

.btn-outline {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-outline:hover {
  border-color: var(--border-hover);
  background: var(--primary-subtle);
}

.btn-lg {
  padding: 16px 36px;
  font-size: 1.05rem;
  border-radius: var(--radius);
}

.btn-sm {
  padding: 8px 20px;
  font-size: 0.85rem;
}

.btn-block {
  width: 100%;
}

/* ============================================
   Navigation
   ============================================ */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  padding: 16px 0;
  transition: all 0.3s ease;
}

.nav.scrolled {
  background: rgba(10, 10, 26, 0.85);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.2rem;
}

.nav-logo {
  height: 36px;
  width: auto;
  filter: brightness(0) invert(1);
}

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

.nav-links a:not(.btn) {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
}

.nav-links a:not(.btn):hover {
  color: var(--text);
}

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

.nav-toggle span {
  width: 22px;
  height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: all 0.3s;
}

/* ============================================
   Hero
   ============================================ */

.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  padding: 120px 0 80px;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-gradient {
  position: absolute;
  inset: 0;
  background:
    radial-gradient(ellipse 80% 60% at 50% 20%, rgba(99, 102, 241, 0.12) 0%, transparent 60%),
    radial-gradient(ellipse 50% 40% at 80% 60%, rgba(139, 92, 246, 0.08) 0%, transparent 50%);
}

.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse 70% 50% at 50% 30%, black 0%, transparent 70%);
  -webkit-mask-image: radial-gradient(ellipse 70% 50% at 50% 30%, black 0%, transparent 70%);
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 840px;
  margin: 0 auto;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--primary-light);
  background: var(--primary-subtle);
  border: 1px solid rgba(99, 102, 241, 0.15);
  padding: 8px 20px;
  border-radius: 100px;
  margin-bottom: 32px;
}

.hero-sub {
  font-size: 1.2rem;
  color: var(--text-secondary);
  margin-top: 24px;
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.7;
}

.hero-actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  margin-top: 40px;
}

.hero-trust {
  display: flex;
  gap: 32px;
  justify-content: center;
  margin-top: 56px;
  flex-wrap: wrap;
}

.hero-trust-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ============================================
   Social Proof
   ============================================ */

.social-proof {
  padding: 64px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.social-proof-label {
  text-align: center;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-weight: 600;
  margin-bottom: 40px;
}

.proof-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  text-align: center;
}

.proof-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.proof-number {
  font-size: 1.75rem;
  font-weight: 800;
  color: var(--text);
}

.proof-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
}

/* ============================================
   Features
   ============================================ */

.features {
  padding: 120px 0;
}

.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.feature-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.feature-card:hover {
  border-color: var(--border-hover);
  background: var(--bg-card-hover);
  transform: translateY(-2px);
}

.feature-card-highlight {
  grid-column: 1 / -1;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.08), rgba(139, 92, 246, 0.04));
  border-color: rgba(99, 102, 241, 0.15);
}

.feature-icon {
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-subtle);
  border-radius: var(--radius-sm);
  color: var(--primary-light);
  margin-bottom: 20px;
}

.feature-card h3 {
  margin-bottom: 10px;
}

.feature-card p {
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.65;
}

/* Features more */
.features-more {
  margin-top: 56px;
  text-align: center;
}

.features-more h3 {
  font-size: 1rem;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-bottom: 24px;
}

.features-more-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
}

.feature-mini {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.875rem;
  color: var(--text-secondary);
  font-weight: 500;
  padding: 12px 16px;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
}

/* ============================================
   Security
   ============================================ */

.security {
  padding: 120px 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.security-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
}

.security-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.security-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.security-icon {
  width: 52px;
  height: 52px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--primary-subtle);
  border-radius: var(--radius-sm);
  margin-bottom: 20px;
}

.security-card h3 {
  margin-bottom: 10px;
}

.security-card p {
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.65;
}

.security-cta {
  margin-top: 56px;
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.security-cta p {
  color: var(--text-muted);
  font-size: 1rem;
  line-height: 1.7;
  font-style: italic;
}

/* ============================================
   Platform / Architecture
   ============================================ */

.platform {
  padding: 120px 0;
}

.arch-cards {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.arch-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: all 0.3s ease;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.arch-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.arch-label {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--primary-light);
  margin-bottom: 8px;
}

.arch-tech {
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 12px;
}

.arch-card p {
  color: var(--text-secondary);
  font-size: 0.925rem;
  line-height: 1.65;
}

.arch-region {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 12px;
  margin-top: 40px;
  padding: 16px 24px;
  background: var(--primary-subtle);
  border: 1px solid rgba(99, 102, 241, 0.12);
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  color: var(--text-secondary);
  font-weight: 500;
}

/* ============================================
   Pricing
   ============================================ */

.pricing {
  padding: 120px 0;
  background: var(--bg-elevated);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}

.pricing-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  align-items: start;
}

.pricing-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  transition: all 0.3s ease;
  position: relative;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.pricing-card:hover {
  border-color: var(--border-hover);
  transform: translateY(-2px);
}

.pricing-card-featured {
  border-color: var(--primary);
  background: linear-gradient(180deg, rgba(99, 102, 241, 0.08), var(--bg-card));
  box-shadow: 0 0 40px rgba(99, 102, 241, 0.1);
}

.pricing-badge {
  position: absolute;
  top: -12px;
  left: 50%;
  transform: translateX(-50%);
  background: var(--primary);
  color: white;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding: 4px 16px;
  border-radius: 100px;
}

.pricing-tier {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: 4px;
}

.pricing-desc {
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-bottom: 24px;
}

.pricing-price {
  margin-bottom: 32px;
}

.pricing-amount {
  font-size: 3rem;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.pricing-period {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.pricing-features {
  list-style: none;
  text-align: left;
  margin-bottom: 32px;
}

.pricing-features li {
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
  font-size: 0.9rem;
  color: var(--text-secondary);
  display: flex;
  align-items: center;
  gap: 10px;
}

.pricing-features li::before {
  content: '';
  width: 18px;
  height: 18px;
  flex-shrink: 0;
  background: var(--primary-subtle);
  border-radius: 50%;
  background-image: url("data:image/svg+xml,%3Csvg width='12' height='12' viewBox='0 0 12 12' fill='none' xmlns='http://www.w3.org/2000/svg'%3E%3Cpath d='M2 6l3 3 5-5' stroke='%236366f1' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: center;
}

.pricing-note {
  text-align: center;
  font-size: 0.85rem;
  color: var(--text-muted);
  margin-top: 40px;
}

/* ============================================
   Contact
   ============================================ */

.contact {
  padding: 120px 0;
}

.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.contact-text h2 {
  margin-bottom: 20px;
}

.contact-text > p {
  color: var(--text-secondary);
  font-size: 1.05rem;
  line-height: 1.7;
  margin-bottom: 32px;
}

.contact-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.contact-item {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.contact-item a {
  color: var(--primary-light);
  transition: color 0.2s;
}

.contact-item a:hover {
  color: var(--primary);
}

.contact-form {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 16px;
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  color: var(--text);
  font-family: var(--font);
  font-size: 0.95rem;
  transition: all 0.2s;
  outline: none;
}

.form-group input::placeholder,
.form-group textarea::placeholder {
  color: var(--text-muted);
}

.form-group input:focus,
.form-group textarea:focus {
  border-color: var(--primary);
  box-shadow: 0 0 0 3px var(--primary-subtle);
}

.form-group textarea {
  resize: vertical;
  min-height: 100px;
}

/* ============================================
   Footer
   ============================================ */

.footer {
  padding: 48px 0;
  border-top: 1px solid var(--border);
}

.footer-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 24px;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--text-secondary);
}

.footer-brand .nav-logo {
  width: 24px;
  height: 24px;
}

.footer-logo {
  height: 28px;
  width: auto;
  filter: brightness(0) invert(1);
  opacity: 0.7;
}

.footer-links {
  display: flex;
  gap: 28px;
}

.footer-links a {
  font-size: 0.85rem;
  color: var(--text-muted);
  font-weight: 500;
  transition: color 0.2s;
}

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

.footer-bottom {
  text-align: center;
}

.footer-bottom p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.6;
}

/* ============================================
   Responsive
   ============================================ */

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

  .feature-card-highlight {
    grid-column: 1 / -1;
  }

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

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: rgba(10, 10, 26, 0.95);
    backdrop-filter: blur(20px);
    -webkit-backdrop-filter: blur(20px);
    flex-direction: column;
    padding: 24px;
    gap: 16px;
    border-bottom: 1px solid var(--border);
  }

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

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 100px 0 60px;
    min-height: auto;
  }

  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.75rem;
  }

  .hero-sub {
    font-size: 1.05rem;
  }

  .hero-actions {
    flex-direction: column;
    align-items: center;
  }

  .hero-trust {
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .proof-stats {
    grid-template-columns: repeat(2, 1fr);
    gap: 24px;
  }

  .features-grid,
  .security-grid,
  .arch-cards,
  .pricing-grid {
    grid-template-columns: 1fr;
  }

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

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

  .contact-form {
    padding: 24px;
  }

  .footer-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 16px;
  }

  .pricing-card-featured {
    order: -1;
  }
}

@media (max-width: 480px) {
  .container {
    padding: 0 16px;
  }

  h1 {
    font-size: 2rem;
  }

  .features, .security, .platform, .pricing, .contact {
    padding: 80px 0;
  }
}

/* ============================================
   Animations
   ============================================ */

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(24px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.hero-content {
  animation: fadeInUp 0.8s ease-out;
}

.feature-card,
.security-card,
.arch-card,
.pricing-card {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease, border-color 0.3s ease, background 0.3s ease;
}

.feature-card.visible,
.security-card.visible,
.arch-card.visible,
.pricing-card.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ============================================
   Selection
   ============================================ */

::selection {
  background: rgba(99, 102, 241, 0.3);
  color: white;
}

/* ============================================
   Scrollbar
   ============================================ */

::-webkit-scrollbar {
  width: 8px;
}

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

::-webkit-scrollbar-thumb {
  background: rgba(255, 255, 255, 0.1);
  border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
  background: rgba(255, 255, 255, 0.2);
}