/* ============================================
   HOÀN KIM - Main Stylesheet
   Dark Navy + Cyan Neon Theme
   ============================================ */
@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&display=swap');

/* ---- CSS Variables ---- */
:root {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1a1f2e;
  --bg-card-hover: #1e2538;
  --accent: #00d4ff;
  --accent-hover: #0ea5e9;
  --accent-glow: rgba(0, 212, 255, 0.15);
  --accent-glow-strong: rgba(0, 212, 255, 0.3);
  --text-primary: #ffffff;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --border-color: rgba(0, 212, 255, 0.12);
  --border-subtle: rgba(255,255,255,0.06);
  --gradient-hero: linear-gradient(135deg, #0a0e1a 0%, #0f172a 50%, #0a0e1a 100%);
  --gradient-accent: linear-gradient(135deg, #00d4ff, #0ea5e9);
  --gradient-card: linear-gradient(145deg, rgba(26,31,46,0.8), rgba(17,24,39,0.9));
  --shadow-card: 0 4px 24px rgba(0,0,0,0.3);
  --shadow-glow: 0 0 30px rgba(0, 212, 255, 0.08);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --font: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
}

/* ---- Reset ---- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: 80px; }
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 { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { max-width: 100%; height: auto; display: block; }
button { cursor: pointer; font-family: var(--font); border: none; outline: none; }

/* ---- Container ---- */
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ---- Animations ---- */
@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}
@keyframes pulse { 0%,100% { transform: scale(1); } 50% { transform: scale(1.05); } }
@keyframes float { 0%,100% { transform: translateY(0); } 50% { transform: translateY(-10px); } }
@keyframes shimmer {
  0% { background-position: -200% 0; }
  100% { background-position: 200% 0; }
}
.animate-on-scroll { opacity: 0; transform: translateY(30px); transition: opacity 0.6s ease, transform 0.6s ease; }
.animate-on-scroll.visible { opacity: 1; transform: translateY(0); }

/* ============================================
   HEADER / NAVBAR
   ============================================ */
.header {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  background: rgba(10, 14, 26, 0.85);
  backdrop-filter: blur(20px); -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-subtle);
  transition: var(--transition);
}
.header.scrolled { background: rgba(10, 14, 26, 0.95); box-shadow: 0 4px 30px rgba(0,0,0,0.3); }
.header .container { display: flex; align-items: center; justify-content: space-between; height: 72px; }
.logo { display: flex; align-items: center; gap: 10px; font-size: 1.5rem; font-weight: 800; }
.logo span { background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.logo-icon { width: 36px; height: 36px; background: var(--gradient-accent); border-radius: var(--radius-sm); display: flex; align-items: center; justify-content: center; font-weight: 800; font-size: 0.8rem; color: var(--bg-primary); }
.nav-menu { display: flex; align-items: center; gap: 32px; }
.nav-menu a { color: var(--text-secondary); font-weight: 500; font-size: 0.95rem; position: relative; padding: 4px 0; }
.nav-menu a::after { content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px; background: var(--gradient-accent); transition: var(--transition); border-radius: 2px; }
.nav-menu a:hover, .nav-menu a.active { color: var(--text-primary); }
.nav-menu a:hover::after, .nav-menu a.active::after { width: 100%; }
.btn-cta {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 10px 24px; border-radius: var(--radius-sm);
  font-weight: 600; font-size: 0.9rem;
  transition: var(--transition);
}
.btn-primary {
  background: var(--gradient-accent); color: var(--bg-primary);
  box-shadow: 0 4px 15px rgba(0, 212, 255, 0.3);
}
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 6px 25px rgba(0, 212, 255, 0.4); }
.btn-outline {
  border: 1.5px solid var(--accent); color: var(--accent);
  background: transparent;
}
.btn-outline:hover { background: var(--accent); color: var(--bg-primary); }
.hamburger { display: none; flex-direction: column; gap: 5px; cursor: pointer; padding: 5px; }
.hamburger span { width: 24px; height: 2px; background: var(--text-primary); transition: var(--transition); border-radius: 2px; }
.hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(5px, 5px); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(5px, -5px); }

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  min-height: auto; display: flex; align-items: center;
  background: var(--gradient-hero);
  position: relative; overflow: hidden;
  padding: 100px 0 30px;
}
.hero::before {
  content: ''; position: absolute; top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(0,212,255,0.08) 0%, transparent 70%);
  border-radius: 50%; pointer-events: none;
}
.hero .container { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.hero-content { animation: fadeInUp 0.8s ease; }
.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-color);
  font-size: 0.85rem; color: var(--accent); margin-bottom: 24px; font-weight: 500;
}
.hero-content h1 { font-size: 3.5rem; font-weight: 800; line-height: 1.15; margin-bottom: 8px; }
.hero-content h1 .highlight { background: var(--gradient-accent); -webkit-background-clip: text; -webkit-text-fill-color: transparent; background-clip: text; }
.hero-content .subtitle { font-size: 1.35rem; color: var(--text-secondary); margin-bottom: 28px; font-weight: 400; }
.hero-features { display: flex; flex-direction: column; gap: 12px; margin-bottom: 36px; }
.hero-features li { display: flex; align-items: center; gap: 12px; color: var(--text-secondary); font-size: 1rem; }
.hero-features li i { color: var(--accent); font-size: 0.85rem; width: 20px; }
.hero-buttons { display: flex; gap: 16px; flex-wrap: wrap; }
.hero-image { display: flex; justify-content: center; animation: fadeIn 1s ease 0.3s both; }
.hero-image img { max-width: 480px; filter: drop-shadow(0 20px 40px rgba(0,212,255,0.15)); animation: float 4s ease-in-out infinite; }
.hero-image .hero-placeholder {
  width: 420px; height: 380px;
  background: var(--gradient-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); display: flex; align-items: center; justify-content: center;
  font-size: 4rem; color: var(--accent); animation: float 4s ease-in-out infinite;
}

/* ============================================
   SECTION COMMON
   ============================================ */
.section { padding: 70px 0; position: relative; }
.section-header { text-align: center; margin-bottom: 60px; }
.section-header h2 { font-size: 2.2rem; font-weight: 700; margin-bottom: 12px; }
.section-header p { color: var(--text-secondary); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }
.section-divider {
  width: 60px; height: 3px; background: var(--gradient-accent);
  border-radius: 3px; margin: 16px auto 0;
}

/* ============================================
   ADVANTAGES SECTION
   ============================================ */
.advantages { background: var(--bg-secondary); padding: 50px 0; }
.advantages-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.advantage-card {
  background: var(--gradient-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 32px 24px; text-align: center;
  transition: var(--transition); position: relative; overflow: hidden;
}
.advantage-card::before {
  content: ''; position: absolute; top: 0; left: 0; right: 0; height: 3px;
  background: var(--gradient-accent); transform: scaleX(0); transition: var(--transition); transform-origin: left;
}
.advantage-card:hover { transform: translateY(-6px); border-color: var(--accent-glow-strong); box-shadow: var(--shadow-glow); }
.advantage-card:hover::before { transform: scaleX(1); }
.advantage-icon {
  width: 56px; height: 56px; border-radius: 50%;
  background: rgba(0, 212, 255, 0.1); display: flex; align-items: center; justify-content: center;
  margin: 0 auto 20px; font-size: 1.3rem; color: var(--accent); transition: var(--transition);
}
.advantage-card:hover .advantage-icon { background: var(--gradient-accent); color: var(--bg-primary); }
.advantage-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.advantage-card p { color: var(--text-secondary); font-size: 0.9rem; }

/* ============================================
   PACKAGES / PRICING
   ============================================ */
.packages-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; }
.package-card {
  background: var(--gradient-card); border: 1px solid var(--border-color);
  border-radius: var(--radius-lg); padding: 36px 28px; text-align: center;
  transition: var(--transition); position: relative; overflow: hidden;
  display: flex; flex-direction: column;
}
.package-card.featured {
  border-color: var(--accent); box-shadow: 0 0 40px rgba(0, 212, 255, 0.12);
  transform: scale(1.03);
}
.package-card.featured .package-badge {
  position: absolute; top: 16px; right: -30px;
  background: var(--gradient-accent); color: var(--bg-primary);
  padding: 4px 40px; font-size: 0.75rem; font-weight: 700;
  transform: rotate(45deg); text-transform: uppercase;
}
.package-card:hover { transform: translateY(-8px); box-shadow: var(--shadow-glow); }
.package-card.featured:hover { transform: scale(1.03) translateY(-8px); }
.package-icon { font-size: 2rem; color: var(--accent); margin-bottom: 16px; }
.package-card h3 { font-size: 1.35rem; font-weight: 700; margin-bottom: 6px; }
.package-card .pkg-subtitle { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 20px; }
.package-price { margin-bottom: 24px; }
.package-price .price { font-size: 2rem; font-weight: 800; color: var(--accent); }
.package-price .unit { color: var(--text-muted); font-size: 0.9rem; }
.package-features { text-align: left; margin-bottom: 28px; flex-grow: 1; }
.package-features li { padding: 8px 0; border-bottom: 1px solid var(--border-subtle); color: var(--text-secondary); font-size: 0.92rem; display: flex; align-items: center; gap: 10px; }
.package-features li:last-child { border-bottom: none; }
.package-features li i { color: var(--accent); font-size: 0.8rem; width: 16px; }
.package-card .btn-cta { width: 100%; justify-content: center; padding: 12px; }

/* ============================================
   PRODUCTS GRID
   ============================================ */
.products { background: var(--bg-secondary); }
.products-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.product-card {
  background: var(--gradient-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); overflow: hidden; transition: var(--transition);
}
.product-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-glow); border-color: var(--accent-glow-strong); }
.product-image {
  height: 200px; background: linear-gradient(135deg, #1a1f2e, #111827);
  display: flex; align-items: center; justify-content: center;
  font-size: 3rem; color: var(--accent); overflow: hidden;
  position: relative;
}
.product-image img { width: 100%; height: 100%; object-fit: cover; transition: var(--transition); }
.product-card:hover .product-image img { transform: scale(1.05); }
.product-info { padding: 20px; }
.product-info h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; }
.product-info .colors { color: var(--text-muted); font-size: 0.85rem; margin-bottom: 14px; display: flex; align-items: center; gap: 6px; }
.product-info .colors i { color: var(--accent); font-size: 0.7rem; }
.product-info .btn-cta { width: 100%; justify-content: center; padding: 10px; font-size: 0.85rem; }

/* ============================================
   PROCESS / TIMELINE
   ============================================ */
.process-timeline { position: relative; max-width: 800px; margin: 0 auto; }
.process-timeline::before {
  content: ''; position: absolute; left: 28px; top: 0; bottom: 0;
  width: 2px; background: linear-gradient(to bottom, var(--accent), transparent);
}
.process-step {
  display: flex; gap: 24px; margin-bottom: 40px; position: relative;
  opacity: 0; transform: translateX(-20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}
.process-step.visible { opacity: 1; transform: translateX(0); }
.step-number {
  width: 56px; height: 56px; min-width: 56px;
  background: var(--bg-card); border: 2px solid var(--accent);
  border-radius: 50%; display: flex; align-items: center; justify-content: center;
  font-weight: 700; font-size: 1.1rem; color: var(--accent);
  z-index: 1; transition: var(--transition);
}
.process-step:hover .step-number { background: var(--gradient-accent); color: var(--bg-primary); border-color: var(--accent); }
.step-content {
  background: var(--gradient-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); padding: 24px; flex: 1; transition: var(--transition);
}
.process-step:hover .step-content { border-color: var(--accent-glow-strong); box-shadow: var(--shadow-glow); }
.step-content h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 6px; }
.step-content p { color: var(--text-secondary); font-size: 0.92rem; }
.deposit-note {
  max-width: 800px; margin: 40px auto 0; padding: 20px 24px;
  background: rgba(0, 212, 255, 0.05); border: 1px solid var(--border-color);
  border-radius: var(--radius); color: var(--text-secondary); font-size: 0.9rem;
  text-align: center; border-left: 3px solid var(--accent);
}

/* ============================================
   FAQ ACCORDION
   ============================================ */
.faq-list { max-width: 800px; margin: 0 auto; }
.faq-item {
  background: var(--gradient-card); border: 1px solid var(--border-color);
  border-radius: var(--radius); margin-bottom: 12px; overflow: hidden; transition: var(--transition);
}
.faq-item:hover { border-color: var(--accent-glow-strong); }
.faq-item.active { border-color: var(--accent); box-shadow: var(--shadow-glow); }
.faq-question {
  width: 100%; padding: 20px 24px; background: none; border: none;
  color: var(--text-primary); font-size: 1rem; font-weight: 500;
  text-align: left; display: flex; align-items: center; justify-content: space-between;
  gap: 16px; cursor: pointer; font-family: var(--font);
}
.faq-question i { color: var(--accent); font-size: 0.85rem; transition: var(--transition); min-width: 16px; }
.faq-item.active .faq-question i { transform: rotate(180deg); }
.faq-answer { padding: 0 24px; max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; }
.faq-item.active .faq-answer { padding: 0 24px 20px; max-height: 300px; }
.faq-answer p { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.7; }

/* ============================================
   FOOTER
   ============================================ */
.footer {
  background: var(--bg-secondary); border-top: 1px solid var(--border-subtle);
  padding: 60px 0 0;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 48px; margin-bottom: 40px; }
.footer-brand .logo { margin-bottom: 16px; }
.footer-brand p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.7; margin-bottom: 8px; }
.footer-brand .contact-line { display: flex; align-items: center; gap: 8px; color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 6px; }
.footer-brand .contact-line i { color: var(--accent); width: 16px; }
.footer-links h4 { font-size: 1rem; font-weight: 600; margin-bottom: 20px; color: var(--text-primary); position: relative; padding-bottom: 10px; }
.footer-links h4::after { content: ''; position: absolute; bottom: 0; left: 0; width: 30px; height: 2px; background: var(--gradient-accent); border-radius: 2px; }
.footer-links ul li { margin-bottom: 10px; }
.footer-links ul li a { color: var(--text-secondary); font-size: 0.9rem; display: flex; align-items: center; gap: 8px; }
.footer-links ul li a:hover { color: var(--accent); transform: translateX(4px); }
.footer-links ul li a i { font-size: 0.7rem; color: var(--accent); }
.footer-bottom { border-top: 1px solid var(--border-subtle); padding: 20px 0; text-align: center; }
.footer-bottom p { color: var(--text-muted); font-size: 0.85rem; }

/* ============================================
   FLOATING CONTACT WIDGET
   ============================================ */
.float-widget { position: fixed; bottom: 24px; right: 24px; z-index: 999; display: flex; flex-direction: column; gap: 12px; }
.float-btn {
  width: 52px; height: 52px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.2rem; color: #fff; box-shadow: 0 4px 15px rgba(0,0,0,0.3);
  transition: var(--transition); position: relative;
}
.float-btn:hover { transform: scale(1.1); }
.float-btn.zalo { background: #0068ff; }
.float-btn.phone { background: #22c55e; animation: pulse 2s infinite; }
.float-btn.fb { background: #1877f2; }
.float-btn.maps { background: #ea4335; }

/* ============================================
   PAGE CONTENT (subpages)
   ============================================ */
.page-hero {
  padding: 120px 0 60px; background: var(--gradient-hero);
  text-align: center; border-bottom: 1px solid var(--border-subtle);
}
.page-hero h1 { font-size: 2.5rem; font-weight: 700; margin-bottom: 12px; }
.page-hero .breadcrumb { display: flex; align-items: center; justify-content: center; gap: 8px; color: var(--text-muted); font-size: 0.9rem; }
.page-hero .breadcrumb a { color: var(--accent); }
.page-content { padding: 60px 0 100px; }
.page-content .content-body { max-width: 800px; margin: 0 auto; }
.page-content .content-body h2 { font-size: 1.8rem; font-weight: 700; margin-bottom: 16px; margin-top: 40px; color: var(--accent); }
.page-content .content-body h2:first-child { margin-top: 0; }
.page-content .content-body h3 { font-size: 1.3rem; font-weight: 600; margin-bottom: 12px; margin-top: 28px; }
.page-content .content-body p { color: var(--text-secondary); margin-bottom: 16px; line-height: 1.8; }
.page-content .content-body ul { margin-bottom: 16px; padding-left: 20px; }
.page-content .content-body ul li { color: var(--text-secondary); margin-bottom: 8px; line-height: 1.7; position: relative; padding-left: 16px; }
.page-content .content-body ul li::before { content: '›'; position: absolute; left: 0; color: var(--accent); font-weight: 700; }
.page-content .content-body strong { color: var(--text-primary); }

/* ============================================
   RESPONSIVE
   ============================================ */
@media (max-width: 1024px) {
  .hero .container { grid-template-columns: 1fr; text-align: center; }
  .hero-content h1 { font-size: 2.8rem; }
  .hero-buttons { justify-content: center; }
  .hero-features { align-items: center; }
  .hero-image { order: -1; }
  .hero-image .hero-placeholder { width: 300px; height: 260px; }
  .advantages-grid { grid-template-columns: repeat(2, 1fr); }
  .packages-grid { grid-template-columns: 1fr; max-width: 420px; margin: 0 auto; }
  .package-card.featured { transform: none; }
  .package-card.featured:hover { transform: translateY(-8px); }
  .products-grid { grid-template-columns: repeat(2, 1fr); }
  .footer-grid { grid-template-columns: 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  .nav-menu { display: none; position: fixed; top: 72px; left: 0; right: 0; bottom: 0; background: rgba(10,14,26,0.98); flex-direction: column; justify-content: center; gap: 24px; padding: 40px; }
  .nav-menu.active { display: flex; }
  .nav-menu a { font-size: 1.2rem; }
  .hamburger { display: flex; }
  .hero-content h1 { font-size: 2.2rem; }
  .hero-content .subtitle { font-size: 1.1rem; }
  .section { padding: 60px 0; }
  .section-header h2 { font-size: 1.8rem; }
  .advantages-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .products-grid { grid-template-columns: 1fr; max-width: 400px; margin: 0 auto; }
  .process-timeline::before { left: 18px; }
  .step-number { width: 40px; height: 40px; min-width: 40px; font-size: 0.9rem; }
  .page-hero h1 { font-size: 1.8rem; }
}

@media (max-width: 480px) {
  .hero-content h1 { font-size: 1.8rem; }
  .hero-buttons { flex-direction: column; }
  .hero-buttons .btn-cta { width: 100%; justify-content: center; }
}