/* ===== DESIGN TOKENS ===== */
:root {
  --bg-primary: #0a0a0f;
  --bg-secondary: #12121a;
  --bg-card: #1a1a2e;
  --bg-glass: rgba(26, 26, 46, 0.6);
  --accent: #00d4ff;
  --accent-glow: rgba(0, 212, 255, 0.3);
  --accent-secondary: #7b61ff;
  --accent-warm: #ff6b35;
  --text-primary: #f0f0f5;
  --text-secondary: #a0a0b5;
  --text-muted: #6b6b80;
  --border: rgba(255,255,255,0.08);
  --border-glow: rgba(0, 212, 255, 0.2);
  --radius: 16px;
  --radius-sm: 8px;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --shadow-lg: 0 20px 60px rgba(0,0,0,0.5);
  --font: 'Inter', sans-serif;
}

/* ===== RESET & BASE ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font);
  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; }
ul { list-style: none; }
img { max-width: 100%; display: block; }
button { cursor: pointer; border: none; font-family: inherit; }

.container { max-width: 1280px; margin: 0 auto; padding: 0 24px; }

/* ===== ANIMATED BACKGROUND ===== */
.bg-grid {
  position: fixed; inset: 0; z-index: -1;
  background-image:
    linear-gradient(rgba(0,212,255,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,212,255,0.03) 1px, transparent 1px);
  background-size: 60px 60px;
}

/* ===== HEADER / NAVBAR ===== */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 16px 0;
  background: rgba(10,10,15,0.8);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}
.header.scrolled { padding: 10px 0; background: rgba(10,10,15,0.95); }
.nav { display: flex; align-items: center; justify-content: space-between; }
.logo {
  font-size: 1.75rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  letter-spacing: -0.5px;
}
.logo span { font-weight: 400; opacity: 0.7; }
.nav-links { display: flex; gap: 8px; align-items: center; }
.nav-links a {
  padding: 8px 16px; border-radius: var(--radius-sm);
  color: var(--text-secondary); font-size: 0.9rem; font-weight: 500;
  transition: var(--transition); position: relative;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--accent); background: rgba(0,212,255,0.08);
}
.nav-cta {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary)) !important;
  color: #fff !important; font-weight: 600 !important;
  padding: 10px 24px !important; border-radius: 50px !important;
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 8px 30px var(--accent-glow); }

/* Mobile menu */
.menu-toggle { display: none; background: none; color: var(--text-primary); font-size: 1.5rem; }

/* ===== DROPDOWN ===== */
.dropdown { position: relative; }
.dropdown-menu {
  position: absolute; top: 100%; left: 0;
  min-width: 260px; padding: 8px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); box-shadow: var(--shadow-lg);
  opacity: 0; visibility: hidden; transform: translateY(10px);
  transition: var(--transition);
}
.dropdown:hover .dropdown-menu { opacity: 1; visibility: visible; transform: translateY(4px); }
.dropdown-menu a {
  display: block; padding: 10px 16px; border-radius: var(--radius-sm);
  font-size: 0.85rem; color: var(--text-secondary);
}
.dropdown-menu a:hover { background: rgba(0,212,255,0.08); color: var(--accent); }

/* ===== HERO ===== */
.hero {
  min-height: 100vh; display: flex; align-items: center;
  position: relative; overflow: hidden;
  padding: 120px 0 80px;
}
.hero-bg {
  position: absolute; inset: 0; z-index: 0;
}
.hero-bg img {
  width: 100%; height: 100%; object-fit: cover; opacity: 0.25;
}
.hero-bg::after {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(135deg, rgba(10,10,15,0.9), rgba(10,10,15,0.5), rgba(0,212,255,0.1));
}
.hero-content { position: relative; z-index: 1; max-width: 700px; }
.hero-badge {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 6px 16px; border-radius: 50px;
  background: rgba(0,212,255,0.1); border: 1px solid var(--border-glow);
  font-size: 0.8rem; color: var(--accent); font-weight: 500;
  margin-bottom: 24px;
  animation: fadeInUp 0.8s ease;
}
.hero-badge .dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); animation: pulse 2s infinite; }
.hero h1 {
  font-size: clamp(2.5rem, 5vw, 4rem); font-weight: 800;
  line-height: 1.1; margin-bottom: 24px; letter-spacing: -1px;
  animation: fadeInUp 0.8s ease 0.1s both;
}
.hero h1 .highlight {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.hero p {
  font-size: 1.15rem; color: var(--text-secondary); margin-bottom: 40px;
  max-width: 540px; animation: fadeInUp 0.8s ease 0.2s both;
}
.hero-actions { display: flex; gap: 16px; flex-wrap: wrap; animation: fadeInUp 0.8s ease 0.3s both; }

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 14px 32px; border-radius: 50px;
  font-size: 0.95rem; font-weight: 600;
  transition: var(--transition);
}
.btn-primary {
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  color: #fff;
}
.btn-primary:hover { transform: translateY(-3px); box-shadow: 0 12px 40px var(--accent-glow); }
.btn-outline {
  background: transparent; color: var(--text-primary);
  border: 1px solid var(--border);
}
.btn-outline:hover { border-color: var(--accent); color: var(--accent); background: rgba(0,212,255,0.05); }

/* ===== STATS BAR ===== */
.stats-bar {
  position: relative; z-index: 2; margin-top: -50px; margin-bottom: 60px;
}
.stats-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px;
  background: var(--border); border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-lg);
}
.stat-item {
  background: var(--bg-card); padding: 32px 24px; text-align: center;
  transition: var(--transition);
}
.stat-item:hover { background: rgba(0,212,255,0.05); }
.stat-number {
  font-size: 2.5rem; font-weight: 800;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
}
.stat-label { font-size: 0.85rem; color: var(--text-muted); margin-top: 4px; }

/* ===== SECTION COMMON ===== */
.section { padding: 100px 0; }
.section-header { text-align: center; max-width: 600px; margin: 0 auto 60px; }
.section-tag {
  display: inline-block; padding: 4px 14px; border-radius: 50px;
  background: rgba(0,212,255,0.1); color: var(--accent);
  font-size: 0.8rem; font-weight: 600; text-transform: uppercase;
  letter-spacing: 1px; margin-bottom: 16px;
}
.section-title {
  font-size: clamp(1.8rem, 3vw, 2.5rem); font-weight: 800;
  line-height: 1.2; margin-bottom: 16px;
}
.section-desc { color: var(--text-secondary); font-size: 1rem; }

/* ===== PRODUCT CATEGORIES ===== */
.categories-grid {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px;
}
.category-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden;
  transition: var(--transition); position: relative;
  cursor: pointer;
}
.category-card:hover {
  transform: translateY(-8px); border-color: var(--border-glow);
  box-shadow: 0 20px 60px rgba(0,212,255,0.1);
}
.category-card-img {
  height: 220px; overflow: hidden; position: relative;
  background: linear-gradient(135deg, #111, #1a1a2e);
}
.category-card-img img { width: 100%; height: 100%; object-fit: contain; padding: 20px; transition: var(--transition); }
.category-card:hover .category-card-img img { transform: scale(1.08); }
.category-card-body { padding: 24px; }
.category-card-body h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 8px; }
.category-card-body p { font-size: 0.85rem; color: var(--text-secondary); margin-bottom: 16px; }
.card-link {
  display: inline-flex; align-items: center; gap: 6px;
  font-size: 0.85rem; color: var(--accent); font-weight: 600;
  transition: var(--transition);
}
.card-link:hover { gap: 10px; }

/* ===== WHY CHOOSE US ===== */
.features-grid {
  display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px;
}
.feature-card {
  background: var(--bg-glass); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px 24px;
  backdrop-filter: blur(10px); transition: var(--transition);
  text-align: center;
}
.feature-card:hover { border-color: var(--border-glow); transform: translateY(-6px); }
.feature-icon {
  width: 64px; height: 64px; border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px; font-size: 1.8rem;
  background: linear-gradient(135deg, rgba(0,212,255,0.15), rgba(123,97,255,0.15));
}
.feature-card h3 { font-size: 1rem; font-weight: 700; margin-bottom: 8px; }
.feature-card p { font-size: 0.85rem; color: var(--text-secondary); }

/* ===== PROJECTS ===== */
.projects-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.project-card {
  border-radius: var(--radius); overflow: hidden; position: relative;
  height: 320px; cursor: pointer;
}
.project-card img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform 0.6s ease;
}
.project-card:hover img { transform: scale(1.1); }
.project-overlay {
  position: absolute; inset: 0; padding: 24px;
  background: linear-gradient(to top, rgba(10,10,15,0.95) 0%, transparent 60%);
  display: flex; flex-direction: column; justify-content: flex-end;
  transition: var(--transition);
}
.project-card:hover .project-overlay { background: linear-gradient(to top, rgba(0,212,255,0.2) 0%, transparent 60%); }
.project-overlay h3 { font-size: 1.1rem; font-weight: 700; margin-bottom: 4px; }
.project-overlay p { font-size: 0.8rem; color: var(--text-secondary); }

/* ===== SERVICES ===== */
.services-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.service-card {
  display: flex; gap: 24px; align-items: flex-start;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
  transition: var(--transition);
}
.service-card:hover { border-color: var(--border-glow); transform: translateY(-4px); }
.service-num {
  font-size: 2.5rem; font-weight: 800; line-height: 1;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  -webkit-background-clip: text; -webkit-text-fill-color: transparent;
  min-width: 60px;
}
.service-card h3 { font-size: 1.05rem; font-weight: 700; margin-bottom: 8px; }
.service-card p { font-size: 0.85rem; color: var(--text-secondary); }

/* ===== TESTIMONIALS ===== */
.testimonial-slider { display: flex; gap: 24px; overflow-x: auto; scroll-snap-type: x mandatory; padding-bottom: 16px; }
.testimonial-slider::-webkit-scrollbar { height: 4px; }
.testimonial-slider::-webkit-scrollbar-thumb { background: var(--accent); border-radius: 4px; }
.testimonial-card {
  min-width: 400px; flex-shrink: 0; scroll-snap-align: start;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
}
.testimonial-stars { color: #fbbf24; font-size: 1rem; margin-bottom: 16px; }
.testimonial-card blockquote { font-size: 0.95rem; color: var(--text-secondary); margin-bottom: 20px; font-style: italic; }
.testimonial-author { display: flex; align-items: center; gap: 12px; }
.testimonial-avatar {
  width: 44px; height: 44px; border-radius: 50%;
  background: linear-gradient(135deg, var(--accent), var(--accent-secondary));
  display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1rem; color: #fff;
}
.testimonial-name { font-weight: 600; font-size: 0.9rem; }
.testimonial-role { font-size: 0.8rem; color: var(--text-muted); }

/* ===== CONTACT / CTA ===== */
.cta-section {
  background: linear-gradient(135deg, rgba(0,212,255,0.08), rgba(123,97,255,0.08));
  border: 1px solid var(--border); border-radius: var(--radius);
  padding: 80px 60px; text-align: center;
}
.cta-section h2 { font-size: 2rem; font-weight: 800; margin-bottom: 16px; }
.cta-section p { color: var(--text-secondary); margin-bottom: 32px; max-width: 500px; margin-left: auto; margin-right: auto; }
.cta-actions { display: flex; gap: 16px; justify-content: center; flex-wrap: wrap; }

/* ===== CONTACT FORM ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.contact-info-card {
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 32px;
}
.contact-info-item { display: flex; gap: 16px; margin-bottom: 24px; }
.contact-info-item:last-child { margin-bottom: 0; }
.contact-info-icon {
  width: 48px; height: 48px; border-radius: 12px;
  background: rgba(0,212,255,0.1); display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; flex-shrink: 0;
}
.contact-info-item h4 { font-size: 0.9rem; font-weight: 600; margin-bottom: 4px; }
.contact-info-item p { font-size: 0.85rem; color: var(--text-secondary); }
.contact-form { display: flex; flex-direction: column; gap: 16px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group { position: relative; }
.form-group input, .form-group textarea, .form-group select {
  width: 100%; padding: 14px 18px;
  background: var(--bg-card); border: 1px solid var(--border);
  border-radius: var(--radius-sm); color: var(--text-primary);
  font-family: var(--font); font-size: 0.9rem;
  transition: var(--transition);
}
.form-group input:focus, .form-group textarea:focus, .form-group select:focus {
  outline: none; border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}
.form-group textarea { min-height: 120px; resize: vertical; }
.form-group input::placeholder, .form-group textarea::placeholder { color: var(--text-muted); }

/* ===== FOOTER ===== */
.footer { border-top: 1px solid var(--border); padding: 60px 0 30px; background: var(--bg-secondary); }
.footer-grid { display: grid; grid-template-columns: 1.5fr 1fr 1fr 1fr; gap: 40px; margin-bottom: 40px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.85rem; margin-top: 12px; }
.footer-col h4 { font-size: 0.9rem; font-weight: 700; margin-bottom: 16px; color: var(--text-primary); }
.footer-col a { display: block; padding: 4px 0; font-size: 0.85rem; color: var(--text-secondary); transition: var(--transition); }
.footer-col a:hover { color: var(--accent); padding-left: 4px; }
.footer-bottom {
  display: flex; justify-content: space-between; align-items: center;
  padding-top: 24px; border-top: 1px solid var(--border);
  font-size: 0.8rem; color: var(--text-muted);
}
.footer-socials { display: flex; gap: 12px; }
.footer-socials a {
  width: 36px; height: 36px; border-radius: 50%;
  background: var(--bg-card); border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  transition: var(--transition);
}
.footer-socials a:hover { background: var(--accent); color: #fff; border-color: var(--accent); }

/* ===== FLOATING CONTACT ===== */
.float-contact {
  position: fixed; bottom: 24px; right: 24px; z-index: 999;
  display: flex; flex-direction: column; gap: 12px; align-items: flex-end;
}
.float-btn {
  width: 56px; height: 56px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem; color: #fff;
  box-shadow: 0 8px 30px rgba(0,0,0,0.3); transition: var(--transition);
}
.float-btn:hover { transform: scale(1.1); }
.float-btn.phone { background: linear-gradient(135deg, #00c853, #00e676); }
.float-btn.zalo { background: linear-gradient(135deg, #0068ff, #0099ff); }
.float-btn.chat { background: linear-gradient(135deg, var(--accent), var(--accent-secondary)); }

/* ===== SEARCH MODAL ===== */
.search-overlay {
  position: fixed; inset: 0; z-index: 2000;
  background: rgba(10,10,15,0.9); backdrop-filter: blur(20px);
  display: none; align-items: flex-start; justify-content: center; padding-top: 20vh;
}
.search-overlay.active { display: flex; }
.search-box {
  width: 90%; max-width: 600px;
  background: var(--bg-card); border: 1px solid var(--border-glow);
  border-radius: var(--radius); padding: 8px;
  box-shadow: 0 20px 80px rgba(0,212,255,0.15);
}
.search-box input {
  width: 100%; padding: 18px 24px;
  background: transparent; border: none; color: var(--text-primary);
  font-size: 1.2rem; font-family: var(--font);
}
.search-box input:focus { outline: none; }
.search-box input::placeholder { color: var(--text-muted); }

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed; bottom: 90px; right: 28px; z-index: 998;
  width: 44px; height: 44px; border-radius: 50%;
  background: var(--bg-card); border: 1px solid var(--border);
  color: var(--accent); display: none; align-items: center; justify-content: center;
  transition: var(--transition); font-size: 1.2rem; cursor: pointer;
}
.back-to-top.visible { display: flex; }
.back-to-top:hover { background: var(--accent); color: #fff; }

/* ===== ANIMATIONS ===== */
@keyframes fadeInUp { from { opacity: 0; transform: translateY(30px); } to { opacity: 1; transform: translateY(0); } }
@keyframes pulse { 0%, 100% { opacity: 1; } 50% { opacity: 0.4; } }
@keyframes float { 0%, 100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: all 0.7s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .categories-grid, .projects-grid { grid-template-columns: repeat(2, 1fr); }
  .features-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .nav-links { display: none; position: fixed; inset: 0; top: 70px; background: var(--bg-primary); flex-direction: column; padding: 24px; gap: 4px; }
  .nav-links.active { display: flex; }
  .menu-toggle { display: block; }
  .categories-grid, .services-grid, .contact-grid { grid-template-columns: 1fr; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); }
  .hero h1 { font-size: 2rem; }
  .cta-section { padding: 40px 24px; }
  .form-row { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; }
  .testimonial-card { min-width: 300px; }
}
@media (max-width: 480px) {
  .stats-grid { grid-template-columns: 1fr; }
  .features-grid { grid-template-columns: 1fr; }
  .projects-grid { grid-template-columns: 1fr; }
}