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

:root {
  --bg: #07090f;
  --bg2: #0c0f1c;
  --bg3: #101525;
  --border: rgba(255,255,255,0.1);
  --border-gold: rgba(212,160,23,0.35);
  --border-silver: rgba(203,213,225,0.25);

  /* Kim palette */
  --purple: #1e3a8a;
  --purple-light: #3b82f6;
  --blue: #1d4ed8;
  --blue-light: #60a5fa;
  --gold: #d4a017;
  --gold-light: #f5c842;
  --gold-bright: #f5e070;
  --silver: #cbd5e1;
  --silver-light: #f1f5f9;
  --white: #ffffff;

  --green: #10b981;
  --text: #f1f5f9;
  --text-muted: #94a3b8;
  --text-dim: #64748b;
  --radius: 16px;
  --radius-sm: 10px;
  --shadow: 0 4px 32px rgba(0,0,0,0.5);
  --shadow-gold: 0 4px 24px rgba(212,160,23,0.2);
  --transition: 0.3s ease;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

h1,h2,h3,h4 { font-family: 'Space Grotesk', sans-serif; line-height: 1.2; }
a { text-decoration: none; color: inherit; transition: var(--transition); }
img { max-width: 100%; }

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

.section { padding: 100px 0; }

.gradient-text {
  background: linear-gradient(135deg, var(--silver-light), var(--blue-light), var(--purple-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.gold-text {
  background: linear-gradient(135deg, var(--gold-bright), var(--gold), var(--gold-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* ===== BUTTONS ===== */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 24px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
  white-space: nowrap;
}
.btn-primary {
  background: linear-gradient(135deg, #1e3a8a, #1d4ed8);
  color: #fff;
  border: 1px solid rgba(245,224,112,0.25);
  box-shadow: 0 4px 20px rgba(30,58,138,0.45), 0 0 0 1px rgba(212,160,23,0.15);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 30px rgba(30,58,138,0.6), 0 0 14px rgba(212,160,23,0.25);
  border-color: rgba(245,224,112,0.45);
}
.btn-ghost {
  background: transparent;
  color: var(--silver-light);
  border: 1px solid var(--border-silver);
}
.btn-ghost:hover {
  border-color: var(--gold-light);
  color: var(--gold-light);
  box-shadow: 0 0 12px rgba(212,160,23,0.15);
}
.btn-lg { padding: 16px 32px; font-size: 1rem; }
.btn-full { width: 100%; justify-content: center; }

/* ===== SECTION HEADER ===== */
.section-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  background: linear-gradient(135deg, rgba(212,160,23,0.1), rgba(91,33,182,0.1));
  border: 1px solid var(--border-gold);
  color: var(--gold-light);
  padding: 6px 16px;
  border-radius: 50px;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin-bottom: 16px;
  box-shadow: 0 0 12px rgba(212,160,23,0.08);
}
.section-header { text-align: center; margin-bottom: 64px; }
.section-title { font-size: clamp(1.8rem, 3vw, 2.6rem); margin-bottom: 16px; }
.section-desc { color: var(--text-muted); max-width: 560px; margin: 0 auto; }

/* ===== NAVBAR ===== */
.navbar {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  padding: 16px 0;
  transition: var(--transition);
}
.navbar.scrolled {
  background: rgba(8,11,20,0.95);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
  padding: 12px 0;
}
.nav-inner {
  display: flex;
  align-items: center;
  gap: 32px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.logo-icon {
  width: 36px; height: 36px;
  background: linear-gradient(135deg, #1e3a8a, #1d4ed8);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
}
.logo-text {
  font-family: 'Space Grotesk', sans-serif;
  font-weight: 700;
  font-size: 1.1rem;
  display: flex;
  flex-direction: column;
  line-height: 1.1;
}
.logo-text .accent { color: var(--purple-light); }
.logo-sub {
  font-size: 0.65rem;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
}
.nav-links a {
  padding: 8px 16px;
  border-radius: 8px;
  font-size: 0.9rem;
  color: var(--text-muted);
}
.nav-links a:hover { color: var(--text); background: rgba(255,255,255,0.05); }
.nav-cta { flex-shrink: 0; }
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
  margin-left: auto;
}
.hamburger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--text);
  border-radius: 2px;
  transition: var(--transition);
}

/* ===== HERO ===== */
.hero {
  position: relative;
  min-height: 100vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 120px 0 80px;
}
#particles {
  position: absolute;
  inset: 0;
  width: 100%; height: 100%;
}
.hero-glow {
  position: absolute;
  border-radius: 50%;
  filter: blur(80px);
  opacity: 0.25;
  pointer-events: none;
}
.glow-1 {
  width: 600px; height: 600px;
  background: #1e3a8a;
  top: -150px; left: -100px;
  opacity: 0.18;
}
.glow-2 {
  width: 500px; height: 500px;
  background: #1d4ed8;
  bottom: -100px; right: -50px;
  opacity: 0.15;
}
.hero-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
}
.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, rgba(212,160,23,0.12), rgba(91,33,182,0.1));
  border: 1px solid var(--border-gold);
  color: var(--gold-light);
  padding: 8px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 28px;
  animation: fadeUp 0.6s ease both;
  box-shadow: 0 0 16px rgba(212,160,23,0.1);
}
.hero-title {
  font-size: clamp(2.4rem, 5vw, 4rem);
  font-weight: 800;
  margin-bottom: 24px;
  animation: fadeUp 0.6s 0.1s ease both;
}
.hero-desc {
  font-size: 1.1rem;
  color: var(--text-muted);
  max-width: 580px;
  margin-bottom: 40px;
  animation: fadeUp 0.6s 0.2s ease both;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 56px;
  animation: fadeUp 0.6s 0.3s ease both;
}
.hero-stats {
  display: flex;
  align-items: center;
  gap: 32px;
  animation: fadeUp 0.6s 0.4s ease both;
}
.stat { display: flex; flex-direction: column; }
.stat-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 2rem;
  font-weight: 700;
  background: linear-gradient(135deg, var(--gold-bright), var(--gold-light));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.stat-label { font-size: 0.8rem; color: var(--text-muted); }
.stat-divider { width: 1px; height: 40px; background: var(--border); }
.hero-scroll {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  color: var(--text-dim);
  font-size: 0.75rem;
  animation: bounce 2s infinite;
}

/* ===== TRUSTED ===== */
.trusted {
  background: var(--bg2);
  padding: 40px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
}
.trusted-label {
  text-align: center;
  color: var(--text-dim);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 24px;
}
.trusted-logos {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 12px;
}
.tech-badge {
  display: flex;
  align-items: center;
  gap: 8px;
  background: linear-gradient(135deg, rgba(255,255,255,0.04), rgba(212,160,23,0.04));
  border: 1px solid var(--border-silver);
  padding: 10px 20px;
  border-radius: 50px;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--silver);
  transition: var(--transition);
}
.tech-badge:hover {
  border-color: var(--gold-light);
  color: var(--gold-bright);
  box-shadow: 0 0 12px rgba(212,160,23,0.15);
}

/* ===== SERVICES ===== */
.services { background: var(--bg); }
.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.service-card {
  position: relative;
  background: var(--bg2);
  border: 1px solid var(--border-silver);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}
.service-card:hover {
  border-color: var(--border-gold);
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0,0,0,0.4), 0 0 20px rgba(212,160,23,0.08);
}
.service-card.featured {
  border-color: rgba(212,160,23,0.4);
  background: linear-gradient(135deg, rgba(212,160,23,0.06), rgba(30,58,138,0.08));
  box-shadow: 0 0 24px rgba(212,160,23,0.08);
}
.featured-badge {
  position: absolute;
  top: -12px; right: 24px;
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: #1a0a00;
  padding: 4px 14px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 700;
  box-shadow: 0 2px 12px rgba(212,160,23,0.4);
}
.service-icon {
  width: 56px; height: 56px;
  background: color-mix(in srgb, var(--c) 15%, transparent);
  border: 1px solid color-mix(in srgb, var(--c) 30%, transparent);
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center;
  font-size: 1.4rem;
  color: var(--c);
  margin-bottom: 20px;
}
.service-card h3 {
  font-size: 1.1rem;
  margin-bottom: 10px;
}
.service-card p {
  color: var(--text-muted);
  font-size: 0.9rem;
  margin-bottom: 20px;
  line-height: 1.7;
}
.service-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.service-list li {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  color: var(--text-muted);
}
.service-list i { color: var(--green); font-size: 0.8rem; }

/* ===== ABOUT ===== */
.about { background: var(--bg2); }
.about-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: center;
}
.about-visual {
  position: relative;
  height: 480px;
}
.about-card-main {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
  text-align: center;
  width: 280px;
  box-shadow: var(--shadow);
}
.about-icon-big {
  width: 64px; height: 64px;
  background: linear-gradient(135deg, #1e3a8a, #1d4ed8);
  border-radius: 16px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.8rem;
  margin: 0 auto 16px;
}
.about-card-main h3 { font-size: 1rem; margin-bottom: 4px; }
.about-card-main p { font-size: 0.8rem; color: var(--text-muted); margin-bottom: 20px; }
.about-mini-stats {
  display: flex;
  justify-content: space-around;
  gap: 8px;
}
.about-mini-stats div {
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-muted);
}
.about-mini-stats span {
  display: block;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--gold-light);
}
.about-card-float {
  position: absolute;
  background: var(--bg3);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.85rem;
  font-weight: 500;
  box-shadow: var(--shadow);
  white-space: nowrap;
}
.about-card-float i { color: var(--purple-light); }
.card-f1 { top: 40px; left: 0; animation: float 4s ease-in-out infinite; }
.card-f2 { top: 40px; right: 0; animation: float 4s 1.5s ease-in-out infinite; }
.card-f3 { bottom: 60px; left: 20px; animation: float 4s 0.8s ease-in-out infinite; }
.about-text { color: var(--text-muted); margin-bottom: 16px; line-height: 1.8; }
.about-features {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin: 28px 0 32px;
}
.af-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9rem;
}
.af-item i { color: var(--green); }

/* ===== PROCESS ===== */
.process { background: var(--bg); }
.process-steps {
  display: flex;
  align-items: flex-start;
  gap: 0;
}
.process-step {
  flex: 1;
  text-align: center;
  padding: 32px 16px;
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  transition: var(--transition);
  position: relative;
}
.process-step:hover { border-color: rgba(124,58,237,0.4); transform: translateY(-4px); }
.step-num {
  font-family: 'Space Grotesk', sans-serif;
  font-size: 3rem;
  font-weight: 800;
  background: linear-gradient(135deg, #f5e070, #f5c842);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  line-height: 1;
  margin-bottom: 12px;
}
.step-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, rgba(212,160,23,0.12), rgba(91,33,182,0.1));
  border: 1px solid var(--border-gold);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  color: var(--gold-light);
  margin: 0 auto 16px;
}
.process-step h3 { font-size: 1rem; margin-bottom: 8px; }
.process-step p { font-size: 0.85rem; color: var(--text-muted); line-height: 1.6; }
.process-arrow {
  color: var(--text-dim);
  font-size: 1.2rem;
  padding: 0 8px;
  margin-top: 60px;
  flex-shrink: 0;
}

/* ===== WHY US ===== */
.why-us { background: var(--bg2); }
.why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.why-card {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 32px;
  transition: var(--transition);
}
.why-card:hover {
  border-color: rgba(124,58,237,0.4);
  transform: translateY(-4px);
}
.why-icon {
  width: 52px; height: 52px;
  background: linear-gradient(135deg, rgba(212,160,23,0.12), rgba(91,33,182,0.08));
  border: 1px solid var(--border-gold);
  border-radius: 14px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.3rem;
  color: var(--gold-light);
  margin-bottom: 20px;
  box-shadow: 0 0 12px rgba(212,160,23,0.08);
}
.why-card h3 { font-size: 1rem; margin-bottom: 10px; }
.why-card p { font-size: 0.88rem; color: var(--text-muted); line-height: 1.7; }

/* ===== CTA BANNER ===== */
.cta-banner {
  position: relative;
  background: linear-gradient(135deg, rgba(30,58,138,0.18), rgba(212,160,23,0.06), rgba(29,78,216,0.12));
  border-top: 1px solid var(--border-gold);
  border-bottom: 1px solid var(--border-gold);
  padding: 80px 0;
  overflow: hidden;
}
.cta-glow {
  position: absolute;
  top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 800px; height: 400px;
  background: radial-gradient(ellipse, rgba(212,160,23,0.08) 0%, rgba(91,33,182,0.1) 50%, transparent 70%);
  pointer-events: none;
}
.cta-inner {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 48px;
  flex-wrap: wrap;
}
.cta-content h2 { font-size: clamp(1.6rem, 2.5vw, 2.2rem); margin-bottom: 12px; }
.cta-content p { color: var(--text-muted); max-width: 480px; }
.cta-actions { display: flex; flex-direction: column; gap: 12px; flex-shrink: 0; }
.cta-note { font-size: 0.85rem; color: var(--text-muted); display: flex; align-items: center; gap: 6px; }
.cta-note a { color: var(--purple-light); }

/* ===== CONTACT ===== */
.contact { background: var(--bg); }
.contact-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 80px;
  align-items: start;
}
.contact-desc { color: var(--text-muted); margin: 16px 0 40px; line-height: 1.8; }
.contact-items { display: flex; flex-direction: column; gap: 20px; }
.contact-item {
  display: flex;
  align-items: center;
  gap: 16px;
}
.ci-icon {
  width: 44px; height: 44px;
  background: linear-gradient(135deg, rgba(212,160,23,0.12), rgba(91,33,182,0.08));
  border: 1px solid var(--border-gold);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  color: var(--gold-light);
  flex-shrink: 0;
}
.ci-label {
  display: block;
  font-size: 0.75rem;
  color: var(--text-dim);
  margin-bottom: 2px;
}
.contact-item a, .contact-item span {
  font-size: 0.9rem;
  color: var(--text-muted);
}
.contact-item a:hover { color: var(--purple-light); }
.contact-form-wrap {
  background: var(--bg2);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 40px;
}
.form-group { margin-bottom: 20px; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.form-group label {
  display: block;
  font-size: 0.85rem;
  font-weight: 500;
  margin-bottom: 8px;
  color: var(--text);
}
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  color: var(--text);
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  outline: none;
  transition: var(--transition);
  -webkit-appearance: none;
}
.form-group input::placeholder,
.form-group textarea::placeholder { color: var(--text-dim); }
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  border-color: var(--purple);
  box-shadow: 0 0 0 3px rgba(124,58,237,0.15);
}
.form-group select option { background: var(--bg3); }
.form-group textarea { resize: vertical; min-height: 120px; }
.form-note { text-align: center; font-size: 0.8rem; color: var(--text-dim); margin-top: 12px; }

/* ===== FOOTER ===== */
.footer {
  background: var(--bg2);
  border-top: 1px solid var(--border);
  padding: 64px 0 0;
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
  padding-bottom: 48px;
}
.footer-brand p {
  color: var(--text-muted);
  font-size: 0.88rem;
  margin: 16px 0 24px;
  max-width: 280px;
  line-height: 1.7;
}
.footer-social {
  display: flex;
  gap: 12px;
}
.footer-social a {
  width: 36px; height: 36px;
  background: rgba(255,255,255,0.05);
  border: 1px solid var(--border);
  border-radius: 10px;
  display: flex; align-items: center; justify-content: center;
  font-size: 0.9rem;
  color: var(--text-muted);
  transition: var(--transition);
}
.footer-social a:hover {
  background: rgba(212,160,23,0.12);
  border-color: var(--gold-light);
  color: var(--gold-light);
  box-shadow: 0 0 10px rgba(212,160,23,0.15);
}
.footer-links h4 {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--text);
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.footer-links a, .footer-links span {
  font-size: 0.85rem;
  color: var(--text-muted);
  padding: 6px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: var(--transition);
}
.footer-links a:hover { color: var(--purple-light); }
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
}
.footer-bottom .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.footer-bottom p { font-size: 0.8rem; color: var(--text-dim); }

/* ===== BACK TO TOP ===== */
.back-to-top {
  position: fixed;
  bottom: 32px; right: 32px;
  width: 44px; height: 44px;
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: #1a0a00;
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem;
  font-weight: 700;
  opacity: 0;
  pointer-events: none;
  transition: var(--transition);
  z-index: 999;
  box-shadow: 0 4px 20px rgba(212,160,23,0.4);
}
.back-to-top.visible { opacity: 1; pointer-events: auto; }
.back-to-top:hover { transform: translateY(-3px); }

/* ===== PHONE FLOAT ===== */
.phone-float {
  position: fixed;
  bottom: 148px; right: 30px;
  width: 50px; height: 50px;
  background: linear-gradient(135deg, #10b981, #059669);
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  color: white;
  font-size: 1.1rem;
  z-index: 999;
  box-shadow: 0 4px 16px rgba(16,185,129,0.45);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-decoration: none;
}
.phone-float:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 24px rgba(16,185,129,0.6);
  color: white;
}
.phone-float .zalo-tooltip { right: 58px; }
.phone-float:hover .zalo-tooltip { opacity: 1; }

/* ===== ZALO FLOAT ===== */
.zalo-float {
  position: fixed;
  bottom: 88px; right: 30px;
  width: 50px; height: 50px;
  background: #0068FF;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  z-index: 999;
  box-shadow: 0 4px 16px rgba(0,104,255,0.45);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  text-decoration: none;
}
.zalo-float:hover {
  transform: translateY(-4px) scale(1.08);
  box-shadow: 0 8px 24px rgba(0,104,255,0.6);
}
.zalo-icon {
  width: 32px; height: 32px;
  position: relative; z-index: 1;
}
.zalo-pulse {
  position: absolute;
  width: 100%; height: 100%;
  border-radius: 50%;
  background: rgba(0,104,255,0.4);
  animation: zaloPulse 2s ease-out infinite;
}
.zalo-tooltip {
  position: absolute;
  right: 58px;
  background: rgba(10,15,30,0.92);
  color: #f1f5f9;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 5px 10px;
  border-radius: 6px;
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.2s ease;
  border: 1px solid rgba(0,104,255,0.3);
}
.zalo-float:hover .zalo-tooltip { opacity: 1; }
@keyframes zaloPulse {
  0%   { transform: scale(1);   opacity: 0.6; }
  70%  { transform: scale(1.6); opacity: 0; }
  100% { transform: scale(1.6); opacity: 0; }
}

/* ===== ANIMATIONS ===== */
@keyframes fadeUp {
  from { opacity: 0; transform: translateY(24px); }
  to { opacity: 1; transform: translateY(0); }
}
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}
@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50% { transform: translateX(-50%) translateY(6px); }
}

/* fade-in on scroll */
.fade-in {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.fade-in.visible { opacity: 1; transform: none; }

/* ===== RESPONSIVE ===== */
@media (max-width: 1024px) {
  .services-grid, .why-grid { grid-template-columns: repeat(2, 1fr); }
  .process-steps { flex-wrap: wrap; }
  .process-arrow { display: none; }
  .process-step { flex: 1 1 160px; }
  .about-inner, .contact-inner { grid-template-columns: 1fr; gap: 48px; }
  .about-visual { height: 320px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .section { padding: 64px 0; }
  .nav-links, .nav-cta { display: none; }
  .hamburger { display: flex; }
  .nav-links.open {
    display: flex;
    flex-direction: column;
    position: fixed;
    top: 64px; left: 0; right: 0;
    background: rgba(8,11,20,0.98);
    backdrop-filter: blur(20px);
    padding: 24px;
    gap: 8px;
    border-bottom: 1px solid var(--border);
  }
  .nav-links.open + .nav-cta { display: none; }
  .services-grid, .why-grid { grid-template-columns: 1fr; }
  .hero-stats { gap: 20px; }
  .cta-inner { flex-direction: column; text-align: center; }
  .form-row { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; gap: 32px; }
  .footer-bottom .container { flex-direction: column; text-align: center; }

  /* About section mobile fix */
  .about-visual {
    height: auto;
    min-height: 0;
    display: flex;
    justify-content: center;
    padding: 16px 0 8px;
  }
  .about-card-main {
    position: relative;
    top: auto; left: auto;
    transform: none;
    width: 100%;
    max-width: 320px;
  }
  .about-card-float { display: none; }
}