/* ============================
   BuluWorks - AdTech Website
   Design: Dark Tech / Blue Accent
   ============================ */

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

:root {
  --bg-primary: #0A0E1A;
  --bg-secondary: #111827;
  --bg-card: #1A2035;
  --bg-card-hover: #1E2642;
  --text-primary: #F1F5F9;
  --text-secondary: #94A3B8;
  --text-muted: #64748B;
  --accent: #3B82F6;
  --accent-light: #60A5FA;
  --accent-glow: rgba(59, 130, 246, 0.3);
  --accent-gradient: linear-gradient(135deg, #3B82F6, #8B5CF6);
  --border: rgba(255, 255, 255, 0.08);
  --border-hover: rgba(255, 255, 255, 0.15);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 20px;
  --font-main: 'Inter', 'Noto Sans SC', -apple-system, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html {
  scroll-behavior: smooth;
}

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

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

button {
  font-family: inherit;
  cursor: pointer;
  border: none;
  outline: none;
}

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

.section {
  padding: 120px 0;
  position: relative;
}

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

.section-header {
  text-align: center;
  margin-bottom: 64px;
}

.section-tag {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-light);
  border-radius: 20px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing:1px;
  text-transform: uppercase;
  margin-bottom: 20px;
}

.section-title {
  font-size: clamp(28px, 4vw, 42px);
  font-weight: 800;
  line-height:1.2;
  margin-bottom: 16px;
}

.gradient-text {
  background: var(--accent-gradient);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* === Buttons === */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 14px 28px;
  border-radius: var(--radius-sm);
  font-size: 15px;
  font-weight: 600;
  transition: var(--transition);
}

.btn-primary {
  background: var(--accent-gradient);
  color: #fff;
  box-shadow: 0 4px 20px var(--accent-glow);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px var(--accent-glow);
}

.btn-outline {
  background: transparent;
  color: var(--text-primary);
  border: 1.5px solid var(--border-hover);
}

.btn-outline:hover {
  border-color: var(--accent);
  color: var(--accent-light);
  background: rgba(59, 130, 246, 0.06);
}

/* === Navbar === */
.navbar {
  position: fixed;
  top:0;
  left:0;
  right:0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
  background: transparent;
}

.navbar.scrolled {
  background: rgba(10, 14, 26, 0.92);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}

.nav-container {
  max-width: 1200px;
  margin:0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.nav-logo {
  font-size: 22px;
  font-weight: 800;
  color: var(--text-primary);
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  color: var(--accent);
  font-size: 18px;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 8px;
}

.nav-link {
  padding: 8px 16px;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: var(--radius-sm);
  transition: var(--transition);
  position: relative;
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

.nav-link.active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 50%;
  transform: translateX(-50%);
  width: 20px;
  height: 2px;
  background: var(--accent-gradient);
  border-radius: 2px;
}

.nav-cta {
  padding: 10px 20px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.nav-cta:hover {
  background: var(--accent-light);
}

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  padding: 8px;
}

.mobile-menu-btn span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* === Hero === */
.hero {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  position: relative;
  overflow: hidden;
  padding: 120px 24px 60px;
}

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

.grid-lines {
  position: absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(255,255,255,0.02) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.02) 1px, transparent 1px);
  background-size: 60px 60px;
}

.glow-orb {
  position: absolute;
  border-radius: 50%;
  filter: blur(120px);
  opacity: 0.5;
  animation: float 8s ease-in-out infinite;
}

.orb-1 {
  width: 600px;
  height: 600px;
  background: radial-gradient(circle, rgba(59,130,246,0.25), transparent 70%);
  top: -200px;
  right: -100px;
}

.orb-2 {
  width: 500px;
  height: 500px;
  background: radial-gradient(circle, rgba(139,92,246,0.2), transparent 70%);
  bottom: -150px;
  left: -100px;
  animation-delay: -3s;
}

.orb-3 {
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(59,130,246,0.15), transparent 70%);
  top: 40%;
  left: 50%;
  animation-delay: -5s;
}

@keyframes float {
  0%, 100% { transform: translateY(0) scale(1); }
  50% { transform: translateY(-30px) scale(1.05); }
}

.hero-content {
  position: relative;
  z-index:1;
  text-align: center;
  max-width: 800px;
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 20px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 30px;
  font-size: 13px;
  font-weight: 600;
  color: var(--accent-light);
  margin-bottom: 32px;
  animation: fadeInUp 0.8s ease both;
}

.badge-dot {
  width: 8px;
  height: 8px;
  background: #22C55E;
  border-radius: 50%;
  animation: pulse-dot 2s ease-in-out infinite;
}

@keyframes pulse-dot {
  0%, 100% { opacity:1; box-shadow: 0 0 0 0 rgba(34,197,94,0.5); }
  50% { opacity:0.7; box-shadow: 0 0 0 6px rgba(34,197,94,0); }
}

.hero-title {
  font-size: clamp(36px, 6vw, 64px);
  font-weight: 800;
  line-height:1.1;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease 0.1s both;
}

.hero-subtitle {
  font-size: 18px;
  color: var(--text-secondary);
  line-height:1.7;
  margin-bottom: 40px;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  animation: fadeInUp 0.8s ease 0.2s both;
}

.hero-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
  animation: fadeInUp 0.8s ease 0.3s both;
}

.hero-scroll {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--text-muted);
  font-size: 12px;
  animation: fadeInUp 0.8s ease 0.6s both;
  margin-top: auto;
  padding-bottom: 40px;
}

.scroll-indicator {
  width: 24px;
  height: 40px;
  border: 2px solid var(--text-muted);
  border-radius: 12px;
  position: relative;
}

.scroll-indicator::after {
  content: '';
  position: absolute;
  top: 8px;
  left: 50%;
  transform: translateX(-50%);
  width: 4px;
  height: 8px;
  background: var(--accent);
  border-radius: 4px;
  animation: scroll-anim 2s ease-in-out infinite;
}

@keyframes scroll-anim {
  0% { top: 8px; opacity:1; }
  100% { top: 20px; opacity:0; }
}

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

/* === About Section (Simplified) === */
.about-simple {
  max-width: 720px;
  margin: 0 auto;
}

.about-lead {
  font-size: 17px;
  color: var(--text-secondary);
  line-height: 1.9;
  text-align: left;
  margin-bottom: 48px;
}

.about-values {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 520px;
  margin: 0 auto;
}

.value-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
  text-align: center;
}

.value-header {
  display: flex;
  align-items: center;
  gap: 10px;
}

.value-icon {
  width: 28px;
  height: 28px;
  min-width: 28px;
  background: rgba(59, 130, 246, 0.1);
  border: 1px solid rgba(59, 130, 246, 0.2);
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-light);
  font-size: 14px;
}

.value-header h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 0;
}

.value-item p {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 0;
}

/* === Services Section === */
.services-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.service-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.service-card::before {
  content: '';
  position: absolute;
  top:0;
  left:0;
  right:0;
  height: 3px;
  background: var(--accent-gradient);
  opacity:0;
  transition: var(--transition);
}

.service-card:hover {
  border-color: rgba(59, 130, 246, 0.3);
  transform: translateY(-4px);
  box-shadow: 0 20px 40px rgba(0,0,0,0.3);
}

.service-card:hover::before {
  opacity:1;
}

.service-icon {
  width: 48px;
  height: 48px;
  color: var(--accent-light);
  margin-bottom: 20px;
}

.service-icon svg {
  width: 100%;
  height: 100%;
}

.service-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 12px;
}

.service-card p {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom:0;
}

/* === Contact Section (Simplified) === */
.section-contact {
  background: var(--bg-secondary);
}

.contact-simple {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 960px;
  margin: 0 auto;
}

.contact-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px 24px;
  text-align: center;
  transition: var(--transition);
}

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

.contact-icon {
  font-size: 28px;
  margin-bottom: 16px;
}

.contact-card h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.contact-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.contact-card a {
  color: var(--accent-light);
  transition: var(--transition);
  font-size: 14px;
}

.location-badge {
  display: inline-block;
  padding: 4px 14px;
  background: rgba(59, 130, 246, 0.12);
  color: var(--accent-light);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.location-badge.hk {
  background: rgba(245, 158, 11, 0.12);
  color: #F59E0B;
}

.location-card h4 {
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.location-card p {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.6;
}

.contact-card a:hover {
  color: var(--accent);
}

/* === Footer === */
.footer {
  background: var(--bg-secondary);
  border-top: 1px solid var(--border);
  padding: 64px 0 32px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}

.footer-logo {
  font-size: 20px;
  font-weight: 800;
  margin-bottom: 12px;
}

.footer-desc {
  color: var(--text-muted);
  font-size: 14px;
  line-height: 1.7;
  max-width: 280px;
}

.footer-links h4 {
  font-size: 14px;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--text-primary);
}

.footer-links a {
  display: block;
  font-size: 14px;
  color: var(--text-muted);
  padding: 6px 0;
  transition: var(--transition);
}

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

.footer-bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 32px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-muted);
}

.footer-bottom-links {
  display: flex;
  gap: 24px;
}

.footer-bottom-links a {
  color: var(--text-muted);
  transition: var(--transition);
}

.footer-bottom-links a:hover {
  color: var(--accent-light);
}

/* === Scroll Reveal === */
.reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* === Responsive === */
@media (max-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .section {
    padding: 80px 0;
  }
  .nav-links {
    display: none;
  }
  .nav-cta {
    display: none;
  }
  .mobile-menu-btn {
    display: flex;
  }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left:0;
    right:0;
    background: rgba(10, 14, 26, 0.98);
    backdrop-filter: blur(20px);
    padding: 16px;
    gap: 4px;
    border-bottom: 1px solid var(--border);
  }
  .services-grid {
    grid-template-columns: 1fr;
  }
  .contact-simple {
    grid-template-columns: 1fr;
  }
  .about-values {
    max-width: 100%;
  }
  .hero-buttons {
    flex-direction: column;
    align-items: center;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  .footer-bottom {
    flex-direction: column;
    gap: 16px;
    text-align: center;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 32px;
  }
}