@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 {
  --veltravia-void: #0a0e1a;
  --veltravia-abyss: #0f1729;
  --veltravia-surface: #141d33;
  --veltravia-surface-light: #1c2745;
  --veltravia-primary: #6c3ce9;
  --veltravia-primary-light: #9a6bff;
  --veltravia-primary-dark: #4a1fb8;
  --veltravia-accent: #00e6b8;
  --veltravia-accent-light: #4fffd8;
  --veltravia-warn: #ff6b4a;
  --veltravia-text-high: #f1f3fb;
  --veltravia-text-mid: #b8c1de;
  --veltravia-text-low: #7683a8;
  --veltravia-border: #263257;
  --veltravia-gradient: linear-gradient(135deg, var(--veltravia-primary) 0%, var(--veltravia-accent) 100%);
  --veltravia-gradient-dark: linear-gradient(180deg, var(--veltravia-abyss) 0%, var(--veltravia-void) 100%);
  --shadow-glow: 0 0 24px rgba(108, 60, 233, 0.35);
  --shadow-glow-accent: 0 0 24px rgba(0, 230, 184, 0.3);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  background-color: var(--veltravia-void);
  color: var(--veltravia-text-mid);
  font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
}

/* Custom Scrollbar */
::-webkit-scrollbar {
  width: 10px;
  height: 10px;
}
::-webkit-scrollbar-track {
  background: var(--veltravia-abyss);
}
::-webkit-scrollbar-thumb {
  background: var(--veltravia-gradient);
  border-radius: 10px;
}
::-webkit-scrollbar-thumb:hover {
  background: var(--veltravia-primary-light);
}

/* Sticky Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 999;
  background-color: var(--veltravia-abyss);
  border-bottom: 1px solid var(--veltravia-border);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.4);
  transition: all 0.3s ease;
}

.site-header .logo-text {
  background: var(--veltravia-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.nav-link {
  position: relative;
  color: var(--veltravia-text-mid);
  font-weight: 500;
  transition: color 0.25s ease;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -6px;
  width: 0%;
  height: 2px;
  background: var(--veltravia-gradient);
  transition: width 0.3s ease;
}
.nav-link:hover {
  color: var(--veltravia-text-high);
}
.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}
.nav-link.active {
  color: var(--veltravia-accent-light);
}

/* Mobile Menu */
.mobile-menu {
  background-color: var(--veltravia-abyss);
  border-top: 1px solid var(--veltravia-border);
}
.mobile-menu a {
  color: var(--veltravia-text-mid);
  border-bottom: 1px solid var(--veltravia-border);
}
.mobile-menu a:hover {
  color: var(--veltravia-accent-light);
  background-color: var(--veltravia-surface);
}
.mobile-menu-toggle {
  color: var(--veltravia-text-high);
  font-size: 1.5rem;
}

/* Buttons */
.btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: var(--veltravia-gradient);
  color: #ffffff;
  font-weight: 600;
  padding: 0.85rem 2rem;
  border-radius: 9999px;
  border: none;
  box-shadow: var(--shadow-glow);
  transition: transform 0.25s ease, box-shadow 0.25s ease, filter 0.25s ease;
  cursor: pointer;
}
.btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 0 32px rgba(108, 60, 233, 0.55);
  filter: brightness(1.08);
}
.btn-primary:active {
  transform: translateY(0px) scale(0.98);
}

.btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--veltravia-accent-light);
  font-weight: 600;
  padding: 0.8rem 1.9rem;
  border-radius: 9999px;
  border: 2px solid var(--veltravia-accent);
  transition: all 0.25s ease;
  cursor: pointer;
}
.btn-secondary:hover {
  background: var(--veltravia-accent);
  color: var(--veltravia-void);
  box-shadow: var(--shadow-glow-accent);
  transform: translateY(-2px);
}

.btn-outline-light {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  background: transparent;
  color: var(--veltravia-text-high);
  font-weight: 600;
  padding: 0.8rem 1.9rem;
  border-radius: 9999px;
  border: 1px solid var(--veltravia-border);
  transition: all 0.25s ease;
}
.btn-outline-light:hover {
  border-color: var(--veltravia-primary-light);
  color: var(--veltravia-primary-light);
}

/* Cards */
.tech-card {
  background-color: var(--veltravia-surface);
  border: 1px solid var(--veltravia-border);
  border-radius: 1rem;
  padding: 2rem;
  transition: transform 0.3s ease, box-shadow 0.3s ease, border-color 0.3s ease;
  position: relative;
  overflow: hidden;
}
.tech-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--veltravia-gradient);
  opacity: 0;
  transition: opacity 0.3s ease;
}
.tech-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.5), var(--shadow-glow);
  border-color: var(--veltravia-primary);
}
.tech-card:hover::before {
  opacity: 1;
}

.tech-card-static {
  background-color: var(--veltravia-surface);
  border: 1px solid var(--veltravia-border);
  border-radius: 1rem;
  padding: 2rem;
  cursor: default;
}

.badge-popular {
  display: inline-block;
  background: var(--veltravia-gradient);
  color: #ffffff;
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.3rem 0.9rem;
  border-radius: 9999px;
  letter-spacing: 0.5px;
}

/* Grid */
.grid-auto {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
}

/* Accordion */
.accordion-item {
  background-color: var(--veltravia-surface);
  border: 1px solid var(--veltravia-border);
  border-radius: 0.75rem;
  overflow: hidden;
  margin-bottom: 1rem;
}
.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.25rem 1.5rem;
  cursor: pointer;
  color: var(--veltravia-text-high);
  font-weight: 600;
  transition: background-color 0.25s ease;
}
.accordion-header:hover {
  background-color: var(--veltravia-surface-light);
}
.accordion-header .accordion-icon {
  transition: transform 0.3s ease;
  color: var(--veltravia-accent-light);
}
.accordion-header.active .accordion-icon {
  transform: rotate(180deg);
}
.accordion-content {
  display: none;
  padding: 0 1.5rem 1.5rem;
  color: var(--veltravia-text-mid);
}

/* Forms */
.form-input,
.form-textarea,
.form-select {
  width: 100%;
  background-color: var(--veltravia-surface);
  border: 1px solid var(--veltravia-border);
  border-radius: 0.6rem;
  padding: 0.85rem 1.1rem;
  color: var(--veltravia-text-high);
  transition: border-color 0.25s ease, box-shadow 0.25s ease;
}
.form-input::placeholder,
.form-textarea::placeholder {
  color: var(--veltravia-text-low);
}
.form-input:focus,
.form-textarea:focus,
.form-select:focus {
  outline: none;
  border-color: var(--veltravia-primary-light);
  box-shadow: 0 0 0 3px rgba(108, 60, 233, 0.25);
}
.form-label {
  display: block;
  color: var(--veltravia-text-mid);
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.4rem;
}
.form-group {
  margin-bottom: 1.4rem;
  position: relative;
}
.form-success {
  background-color: rgba(0, 230, 184, 0.1);
  border: 1px solid var(--veltravia-accent);
  color: var(--veltravia-accent-light);
  padding: 1rem 1.25rem;
  border-radius: 0.6rem;
}

/* Sections */
.section-dark {
  background-color: var(--veltravia-abyss);
  color: var(--veltravia-text-mid);
}
.section-void {
  background-color: var(--veltravia-void);
  color: var(--veltravia-text-mid);
}
.hero-gradient {
  background: radial-gradient(circle at 20% 20%, rgba(108, 60, 233, 0.25), transparent 50%),
    radial-gradient(circle at 80% 70%, rgba(0, 230, 184, 0.2), transparent 50%),
    var(--veltravia-gradient-dark);
}
.gradient-text {
  background: var(--veltravia-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.divider-glow {
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--veltravia-primary), transparent);
}

/* Loading Spinner */
.spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--veltravia-border);
  border-top: 4px solid var(--veltravia-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin {
  to { transform: rotate(360deg); }
}

/* Fade-in Animation */
.fade-in-up {
  opacity: 0;
  transform: translateY(20px);
  animation: fadeInUp 0.6s ease forwards;
}
@keyframes fadeInUp {
  to { opacity: 1; transform: translateY(0); }
}

/* Pulse glow effect */
.pulse-glow {
  animation: pulseGlow 2.4s ease-in-out infinite;
}
@keyframes pulseGlow {
  0%, 100% { box-shadow: 0 0 12px rgba(0, 230, 184, 0.3); }
  50% { box-shadow: 0 0 28px rgba(0, 230, 184, 0.55); }
}

/* Cookie Banner */
.cookie-banner {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: var(--veltravia-abyss);
  border-top: 1px solid var(--veltravia-border);
  color: var(--veltravia-text-mid);
  padding: 1.25rem 1.5rem;
  box-shadow: 0 -8px 30px rgba(0, 0, 0, 0.5);
}
.cookie-banner h3 {
  color: var(--veltravia-text-high);
}
.cookie-banner p {
  color: var(--veltravia-text-mid);
}
.cookie-banner a {
  color: var(--veltravia-accent-light);
  text-decoration: underline;
}
.cookie-banner .btn-cookie-accept {
  background: var(--veltravia-gradient);
  color: #ffffff;
  font-weight: 600;
  padding: 0.6rem 1.5rem;
  border-radius: 9999px;
  border: none;
  cursor: pointer;
  transition: filter 0.25s ease;
}
.cookie-banner .btn-cookie-accept:hover {
  filter: brightness(1.1);
}
.cookie-banner .btn-cookie-decline {
  background: transparent;
  color: var(--veltravia-text-mid);
  font-weight: 500;
  padding: 0.6rem 1.5rem;
  border-radius: 9999px;
  border: 1px solid var(--veltravia-border);
  cursor: pointer;
  transition: all 0.25s ease;
}
.cookie-banner .btn-cookie-decline:hover {
  border-color: var(--veltravia-text-mid);
  color: var(--veltravia-text-high);
}

/* Footer */
.site-footer {
  background-color: var(--veltravia-void);
  color: var(--veltravia-text-mid);
  border-top: 1px solid var(--veltravia-border);
}
.site-footer a {
  color: var(--veltravia-text-mid);
  transition: color 0.25s ease;
}
.site-footer a:hover {
  color: var(--veltravia-accent-light);
}
.site-footer h4 {
  color: var(--veltravia-text-high);
}
.social-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background-color: var(--veltravia-surface);
  color: var(--veltravia-text-mid);
  border: 1px solid var(--veltravia-border);
  transition: all 0.25s ease;
}
.social-icon:hover {
  background: var(--veltravia-gradient);
  color: #ffffff;
  border-color: transparent;
  transform: translateY(-3px);
}

/* Utility */
.text-glow {
  text-shadow: 0 0 14px rgba(0, 230, 184, 0.5);
}
.border-glow {
  border: 1px solid var(--veltravia-primary);
  box-shadow: var(--shadow-glow);
}

@media (max-width: 768px) {
  .tech-card {
    padding: 1.5rem;
  }
  .btn-primary,
  .btn-secondary {
    padding: 0.7rem 1.5rem;
    font-size: 0.9rem;
  }
}