@import url('https://cdn.jsdelivr.net/npm/tailwindcss@2.2.19/dist/tailwind.min.css');
@import url('https://cdn.jsdelivr.net/npm/remixicon@2.5.0/fonts/remixicon.css');

:root {
  --nexus-void: #0A0E1F;
  --nexus-void-light: #131A33;
  --nexus-violet: #6C4AE6;
  --nexus-violet-dark: #4B2FB3;
  --nexus-cyan: #00E5C7;
  --nexus-magenta: #FF3D9A;
  --nexus-light: #F5F6FC;
  --nexus-text-dim: #A7ADD1;
  --nexus-border: rgba(108, 74, 230, 0.25);
  --shadow-glow: 0 0 30px rgba(108, 74, 230, 0.35);
  --shadow-glow-cyan: 0 0 30px rgba(0, 229, 199, 0.3);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
  background-color: var(--nexus-light);
  color: #1A1D2E;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
}
::-webkit-scrollbar-track {
  background: var(--nexus-void);
}
::-webkit-scrollbar-thumb {
  background: linear-gradient(180deg, var(--nexus-violet), var(--nexus-cyan));
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: linear-gradient(180deg, var(--nexus-magenta), var(--nexus-violet));
}

/* Header */
.site-header {
  background-color: var(--nexus-void);
  border-bottom: 1px solid var(--nexus-border);
  position: sticky;
  top: 0;
  z-index: 999;
  transition: box-shadow 0.3s ease;
}

.site-header.scrolled {
  box-shadow: 0 4px 25px rgba(0, 0, 0, 0.35);
}

.nav-link {
  position: relative;
  color: var(--nexus-text-dim);
  transition: color 0.25s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0%;
  height: 2px;
  background: linear-gradient(90deg, var(--nexus-violet), var(--nexus-cyan));
  transition: width 0.3s ease;
}

.nav-link:hover {
  color: #FFFFFF;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link.active {
  color: #FFFFFF;
}

/* Mobile Menu */
.mobile-menu {
  background-color: var(--nexus-void);
  border-top: 1px solid var(--nexus-border);
}

.mobile-menu a {
  color: var(--nexus-text-dim);
  border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

.mobile-menu a:hover {
  color: var(--nexus-cyan);
  background-color: rgba(108, 74, 230, 0.08);
}

.mobile-menu-toggle {
  color: #FFFFFF;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--nexus-violet), var(--nexus-violet-dark));
  color: #FFFFFF;
  padding: 0.85rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: none;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 4px 15px rgba(108, 74, 230, 0.4);
}

.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--nexus-cyan);
  padding: 0.8rem 1.9rem;
  border-radius: 8px;
  font-weight: 600;
  border: 2px solid var(--nexus-cyan);
  cursor: pointer;
  transition: all 0.25s ease;
}

.btn-secondary:hover {
  background: var(--nexus-cyan);
  color: var(--nexus-void);
  box-shadow: var(--shadow-glow-cyan);
}

.btn-magenta {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: linear-gradient(135deg, var(--nexus-magenta), #C21F6C);
  color: #FFFFFF;
  padding: 0.85rem 2rem;
  border-radius: 8px;
  font-weight: 600;
  border: none;
  cursor: pointer;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
  box-shadow: 0 4px 15px rgba(255, 61, 154, 0.4);
}

.btn-magenta:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 30px rgba(255, 61, 154, 0.45);
}

/* Cards */
.nexus-card {
  background: #FFFFFF;
  border: 1px solid #E7E8F2;
  border-radius: 14px;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}

.nexus-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 4px;
  background: linear-gradient(90deg, var(--nexus-violet), var(--nexus-cyan), var(--nexus-magenta));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s ease;
}

.nexus-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 40px rgba(20, 20, 50, 0.12);
  border-color: transparent;
}

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

.nexus-card-dark {
  background: var(--nexus-void-light);
  border: 1px solid var(--nexus-border);
  border-radius: 14px;
  padding: 2rem;
  color: var(--nexus-text-dim);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.nexus-card-dark:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-glow);
}

.nexus-card-dark h3,
.nexus-card-dark h4 {
  color: #FFFFFF;
}

/* Badge */
.badge-popular {
  background: linear-gradient(135deg, var(--nexus-magenta), var(--nexus-violet));
  color: #FFFFFF;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.35rem 1rem;
  border-radius: 999px;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  display: inline-block;
}

/* Forms */
.nexus-form input,
.nexus-form textarea,
.nexus-form select {
  width: 100%;
  padding: 0.9rem 1.1rem;
  border: 2px solid #E7E8F2;
  border-radius: 10px;
  background-color: #FAFAFE;
  color: #1A1D2E;
  transition: border-color 0.25s ease, box-shadow 0.25s ease, background-color 0.25s ease;
  font-size: 0.95rem;
}

.nexus-form input:focus,
.nexus-form textarea:focus,
.nexus-form select:focus {
  outline: none;
  border-color: var(--nexus-violet);
  background-color: #FFFFFF;
  box-shadow: 0 0 0 4px rgba(108, 74, 230, 0.12);
}

.nexus-form label {
  font-weight: 600;
  color: #1A1D2E;
  margin-bottom: 0.4rem;
  display: block;
  font-size: 0.9rem;
}

.nexus-form ::placeholder {
  color: #9A9EC0;
}

/* Accordion */
.accordion-item {
  border: 1px solid #E7E8F2;
  border-radius: 12px;
  margin-bottom: 1rem;
  overflow: hidden;
  transition: border-color 0.25s ease;
}

.accordion-item:hover {
  border-color: var(--nexus-violet);
}

.accordion-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  background: #FFFFFF;
  font-weight: 600;
  color: #1A1D2E;
  transition: background-color 0.25s ease;
}

.accordion-header:hover {
  background-color: #F7F5FF;
}

.accordion-header i {
  transition: transform 0.3s ease;
  color: var(--nexus-violet);
}

.accordion-header.active i {
  transform: rotate(180deg);
}

.accordion-content {
  padding: 0 1.5rem 1.25rem;
  color: #4B5074;
  display: none;
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--nexus-void);
  border-top: 1px solid var(--nexus-border);
  padding: 1.25rem 1.5rem;
  z-index: 1000;
  box-shadow: 0 -10px 30px rgba(0, 0, 0, 0.3);
}

.cookie-banner h3 {
  color: #FFFFFF;
}

.cookie-banner p {
  color: #C7CAE6;
}

.cookie-banner a {
  color: var(--nexus-cyan);
  text-decoration: underline;
}

.cookie-banner a:hover {
  color: #5FF5DE;
}

/* Hero / Sections */
.hero-nexus {
  background: radial-gradient(circle at 20% 20%, rgba(108, 74, 230, 0.35), transparent 50%),
              radial-gradient(circle at 80% 80%, rgba(0, 229, 199, 0.25), transparent 50%),
              var(--nexus-void);
  position: relative;
  overflow: hidden;
}

.hero-nexus::before {
  content: '';
  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: 40px 40px;
  pointer-events: none;
}

.gradient-text {
  background: linear-gradient(135deg, var(--nexus-violet), var(--nexus-cyan));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.section-dark {
  background-color: var(--nexus-void);
  color: var(--nexus-text-dim);
}

.section-dark h2,
.section-dark h3 {
  color: #FFFFFF;
}

/* Loading Spinner */
.nexus-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid rgba(108, 74, 230, 0.2);
  border-top-color: var(--nexus-violet);
  border-radius: 50%;
  animation: nexus-spin 0.8s linear infinite;
}

@keyframes nexus-spin {
  to { transform: rotate(360deg); }
}

/* Floating orb animation */
.floating-orb {
  animation: float-orb 6s ease-in-out infinite;
}

@keyframes float-orb {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-20px); }
}

/* Fade in */
.fade-in-up {
  animation: fadeInUp 0.7s ease both;
}

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

/* Pulse glow for icons */
.icon-glow {
  transition: filter 0.3s ease, transform 0.3s ease;
}

.icon-glow:hover {
  filter: drop-shadow(0 0 12px var(--nexus-violet));
  transform: scale(1.1);
}

/* Stats */
.stat-number {
  font-size: 2.75rem;
  font-weight: 800;
  background: linear-gradient(135deg, var(--nexus-cyan), var(--nexus-violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

/* Footer */
.site-footer {
  background-color: var(--nexus-void);
  color: var(--nexus-text-dim);
  border-top: 1px solid var(--nexus-border);
}

.site-footer a {
  color: var(--nexus-text-dim);
  transition: color 0.25s ease;
}

.site-footer a:hover {
  color: var(--nexus-cyan);
}

.site-footer h3,
.site-footer h4 {
  color: #FFFFFF;
}

.social-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--nexus-void-light);
  border: 1px solid var(--nexus-border);
  color: var(--nexus-text-dim);
  transition: all 0.3s ease;
}

.social-icon:hover {
  background: linear-gradient(135deg, var(--nexus-violet), var(--nexus-cyan));
  color: #FFFFFF;
  transform: translateY(-3px);
  border-color: transparent;
}

/* Pricing tables */
.pricing-card {
  background: #FFFFFF;
  border: 2px solid #E7E8F2;
  border-radius: 16px;
  padding: 2.5rem 2rem;
  position: relative;
  transition: border-color 0.3s ease;
}

.pricing-card.featured {
  border-color: var(--nexus-violet);
  box-shadow: var(--shadow-glow);
}

/* Divider */
.nexus-divider {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--nexus-border), transparent);
  margin: 2.5rem 0;
}

/* Utility text colors on dark */
.text-on-dark-primary { color: #FFFFFF; }
.text-on-dark-secondary { color: var(--nexus-text-dim); }
.text-on-dark-accent { color: var(--nexus-cyan); }

/* Blog cards */
.blog-card {
  background: #FFFFFF;
  border-radius: 14px;
  overflow: hidden;
  border: 1px solid #E7E8F2;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.blog-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 18px 35px rgba(20, 20, 50, 0.14);
}

.blog-card-tag {
  display: inline-block;
  background: rgba(108, 74, 230, 0.1);
  color: var(--nexus-violet-dark);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: 999px;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

/* Timeline for about page */
.timeline-item {
  position: relative;
  padding-left: 2.5rem;
  border-left: 2px solid var(--nexus-border);
  padding-bottom: 2.5rem;
}

.timeline-item::before {
  content: '';
  position: absolute;
  left: -8px;
  top: 0;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--nexus-violet), var(--nexus-cyan));
  box-shadow: 0 0 0 4px #FFFFFF, var(--shadow-glow);
}

/* Responsive helper */
@media (max-width: 768px) {
  .hero-nexus h1 {
    font-size: 2.25rem;
  }
  .stat-number {
    font-size: 2rem;
  }
}