@import url('https://fonts.googleapis.com/css2?family=Outfit:wght@400;500;600;700;800;900&display=swap');

:root {
  /* Core Colors */
  --primary: #0d4a22; /* Xanh lá cây đậm */
  --primary-light: #e2efea;
  --secondary: #f97316; /* Màu cam */
  --secondary-light: #ffedd5;
  --accent: #f59e0b;
  --accent-light: #fef3c7;
  --coral: #ef4444;
  
  /* Light Theme */
  --bg-color: #ffffff;
  --bg-light: #f9fafb;
  --bg-darker: #f3f4f6;
  --text-main: #111827;
  --text-muted: #6b7280;
  --border-color: #e5e7eb;
  
  --card-bg: #ffffff;
  --nav-bg: rgba(255, 255, 255, 0.95);
  --footer-bg: #111827;

  --border-radius-sm: 8px;
  --border-radius-lg: 16px;
  --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-theme="dark"] {
  /* Spotify Inspired Dark Theme */
  --bg-color: #121212;
  --bg-light: #1e1e1e;
  --bg-darker: #0a0a0a;
  
  --text-main: #ffffff;
  --text-muted: #a3a3a3;
  --border-color: #262626;

  --card-bg: #181818;
  --nav-bg: rgba(18, 18, 18, 0.95);
  
  /* Primary shifts slightly to remain visible, but keeps dark green identity */
  --primary: #16a34a; /* Lighter shade of green for contrast in text/borders */
  --primary-light: rgba(22, 163, 74, 0.15);
  
  --secondary: #fb923c; 
  --secondary-light: rgba(251, 146, 60, 0.15);
  
  --accent-light: rgba(245, 158, 11, 0.15);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-family: 'Google Sans Flex', 'Google Sans', 'Outfit', sans-serif;
  color: var(--text-main);
  line-height: 1.6;
}

body {
  background-color: var(--bg-color);
  font-size: 16px;
  transition: var(--transition);
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }

/* Strong Typography per user request */
h1, h2, h3, h4, h5, h6 {
  font-weight: 800; /* To, rõ đậm */
  line-height: 1.1;
  margin-bottom: 0.5rem;
  letter-spacing: -0.03em;
}

/* Text Colors */
.text-teal { color: var(--primary); }
.text-blue { color: var(--secondary); }
.text-amber { color: var(--accent); }
.text-coral { color: var(--coral); }
.text-muted { color: var(--text-muted); }
.text-white { color: #ffffff; }
.text-white-muted { color: rgba(255,255,255,0.7); }
.text-center { text-align: center; }
.text-lg { font-size: 1.25rem; font-weight: 600; }
.text-sm { font-size: 0.875rem; }

/* Layout */
.container { max-width: 1200px; margin: 0 auto; padding: 0 1.5rem; }
.section { padding: 6rem 0; }
.bg-light { background-color: var(--bg-light); }
.bg-teal-dark { background-color: var(--bg-darker); }
.bg-dark { background-color: var(--footer-bg); }

/* Spacing */
.mt-2 { margin-top: 0.5rem; } .mt-4 { margin-top: 1rem; }
.mt-6 { margin-top: 1.5rem; } .mt-8 { margin-top: 2rem; }
.mt-12 { margin-top: 3rem; } .mt-16 { margin-top: 4rem; }
.mb-2 { margin-bottom: 0.5rem; } .mb-4 { margin-bottom: 1rem; }
.mb-6 { margin-bottom: 1.5rem; } .mb-8 { margin-bottom: 2rem; }
.mb-12 { margin-bottom: 3rem; } .pr-8 { padding-right: 2rem; }

.grid { display: grid; gap: 2rem; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-4 { grid-template-columns: repeat(4, 1fr); }
.align-start { align-items: start; }
.w-full { width: 100%; }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.875rem 2rem;
  border-radius: 50px; /* Spotify style pills */
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--transition);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.btn-sm { padding: 0.5rem 1.25rem; font-size: 0.875rem; }

.btn-primary { background-color: var(--primary); color: #fff; }
.btn-primary:hover { filter: brightness(1.2); transform: scale(1.02); }

.btn-outline { background-color: transparent; border-color: var(--primary); color: var(--primary); }
.btn-outline:hover { background-color: var(--primary); color: #fff; transform: scale(1.02); }

.btn-amber { background-color: var(--accent); color: #111; }
.btn-amber:hover { filter: brightness(1.2); transform: scale(1.02); }

.btn-outline-white { background-color: transparent; border-color: var(--text-main); color: var(--text-main); }
.btn-outline-white:hover { border-color: var(--primary); color: var(--primary); }

/* Navigation */
.nav {
  position: fixed; top: 0; left: 0; right: 0;
  background: var(--nav-bg);
  backdrop-filter: blur(10px);
  z-index: 1000;
  border-bottom: 1px solid var(--border-color);
}
.nav-content { display: flex; justify-content: space-between; align-items: center; height: 80px; }
.logo { font-weight: 900; font-size: 1.75rem; letter-spacing: -1px; color: var(--text-main); }
.nav-links { display: flex; gap: 2.5rem; align-items: center; }
.nav-links a { font-weight: 600; color: var(--text-muted); transition: var(--transition); }
.nav-links a:hover { color: var(--text-main); }
.nav-actions { display: flex; align-items: center; gap: 1.5rem; }
.theme-toggle { background: none; border: none; cursor: pointer; color: var(--text-main); padding: 0.5rem; border-radius: 50%; transition: background 0.2s; }
.theme-toggle:hover { background: var(--bg-light); border-radius: 50%; }
.menu-toggle { display: none; background: none; border: none; cursor: pointer; color: var(--text-main); }

/* Sections & Typography */
.section-label {
  display: inline-block; font-size: 0.875rem; font-weight: 800;
  text-transform: uppercase; letter-spacing: 2px;
  color: var(--secondary); margin-bottom: 1rem;
}
.section-title { font-size: 3rem; margin-bottom: 1.5rem; color: var(--text-main); }

/* Hero */
.hero { padding: 10rem 0 6rem; position: relative; }
.hero-inner { max-width: 900px; margin: 0 auto; }
.eyebrow {
  display: inline-block; background: var(--secondary-light); color: var(--secondary);
  padding: 0.5rem 1.5rem; border-radius: 30px; font-size: 0.875rem; font-weight: 800;
  margin-bottom: 2rem; border: 1px solid var(--border-color);
}
.headline { font-size: 4.5rem; line-height: 1.05; margin-bottom: 1.5rem; }
.highlight-blue { background: -webkit-linear-gradient(45deg, var(--secondary), var(--primary)); -webkit-background-clip: text; -webkit-text-fill-color: transparent; }
.subheadline { font-size: 1.25rem; font-weight: 500; color: var(--text-muted); margin-bottom: 3rem; max-width: 700px; margin-inline: auto; }
.cta-group { display: flex; justify-content: center; gap: 1.5rem; }

.hero-stats {
  display: flex; justify-content: center; flex-wrap: wrap;
  background: var(--card-bg); border: 1px solid var(--border-color);
  border-radius: var(--border-radius-lg); overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.05);
}
[data-theme="dark"] .hero-stats { box-shadow: 0 10px 30px rgba(0,0,0,0.5); }
.stat { flex: 1; min-width: 200px; text-align: center; padding: 2.5rem 1.5rem; }
.item-border { border-left: 1px solid var(--border-color); }
.stat-label { display: block; font-size: 0.875rem; font-weight: 700; color: var(--text-muted); text-transform: uppercase; letter-spacing: 1px; margin-bottom: 0.5rem; }
.stat-value { display: block; font-weight: 900; font-size: 1.5rem; color: var(--text-main); }

/* Overview */
.value-pills { display: flex; justify-content: center; gap: 1rem; flex-wrap: wrap; }
.pill { padding: 0.5rem 2rem; border-radius: 30px; font-weight: 700; font-size: 0.875rem; border: 1px solid var(--border-color); }
.pill-teal { background: var(--primary-light); color: var(--primary); border-color: transparent; }
.pill-blue { background: var(--secondary-light); color: var(--secondary); border-color: transparent; }
.pill-amber { background: var(--accent-light); color: var(--accent); border-color: transparent; }

/* Cards & Elements */
.card {
  padding: 3rem;
  border-radius: var(--border-radius-lg);
  background: var(--card-bg);
  border: 1px solid var(--border-color);
  transition: var(--transition);
}
.card:hover { transform: translateY(-5px); box-shadow: 0 10px 30px rgba(0,0,0,0.08); }
[data-theme="dark"] .card:hover { box-shadow: 0 10px 30px rgba(0,0,0,0.5); }

.border-teal { border-top: 6px solid var(--primary); }
.border-blue { border-top: 6px solid var(--secondary); }

.badge { display: inline-block; padding: 0.25rem 1rem; border-radius: 6px; font-size: 0.75rem; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; }
.badge-teal { background: var(--primary-light); color: var(--primary); }
.badge-blue { background: var(--secondary-light); color: var(--secondary); }
.badge-amber { background: var(--accent-light); color: var(--accent); }

.checklist { list-style: none; }
.checklist li { position: relative; padding-left: 2rem; margin-bottom: 1rem; color: var(--text-muted); font-weight: 500; }
.checklist li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--secondary); font-weight: 900; font-size: 1.125rem; }

/* Why choose us */
.reason-item { padding: 2.5rem; background: var(--card-bg); border-radius: var(--border-radius-lg); border: 1px solid var(--border-color); transition: var(--transition); }
.reason-item:hover { background: var(--bg-light); border-color: var(--primary); }
.icon-box { width: 56px; height: 56px; border-radius: 50%; display: flex; align-items: center; justify-content: center; margin-bottom: 2rem; }
.icon-teal { background: var(--primary-light); color: var(--primary); }
.icon-blue { background: var(--secondary-light); color: var(--secondary); }
.icon-amber { background: var(--accent-light); color: var(--accent); }
.icon-coral { background: rgba(239, 68, 68, 0.15); color: var(--coral); }
.icon-box svg { width: 28px; height: 28px; }
.reason-item h4 { font-size: 1.25rem; margin-bottom: 1rem; }
.reason-item p { color: var(--text-muted); font-size: 1rem; font-weight: 500;}

/* About Brand */
.quote { font-size: 1.5rem; font-weight: 700; font-style: normal; line-height: 1.4; border-left: 4px solid var(--primary); padding-left: 2rem; color: var(--text-main); }
.cv-item { background: var(--card-bg); padding: 2rem; border-radius: var(--border-radius-lg); border: 1px solid var(--border-color); }
.cv-item h4 { font-size: 1.25rem; }

/* Services Details */
.flex-align-center { display: flex; align-items: center; }
.dot { width: 14px; height: 14px; border-radius: 50%; margin-right: 1rem; }
.bg-teal { background: var(--primary); }
.bg-blue { background: var(--secondary); }
.group-label { font-size: 2rem; font-weight: 800; }
.service-item h4 { font-size: 1.25rem; }

/* Contact Forms */
.contact-form-wrap { padding: 3rem; background: var(--card-bg); }
.info-label { display: block; font-size: 0.75rem; font-weight: 800; text-transform: uppercase; letter-spacing: 1px; margin-bottom: 0.25rem; color: var(--secondary); }
.info-item p { font-size: 1.125rem; font-weight: 600; color: var(--text-main); }

.form-group { margin-bottom: 1.5rem; }
.form-group label { display: block; margin-bottom: 0.75rem; font-weight: 700; font-size: 0.875rem; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%; padding: 1rem; border: 2px solid var(--border-color); border-radius: var(--border-radius-sm);
  background: var(--bg-color); color: var(--text-main); font-family: inherit; font-size: 1rem; font-weight: 500; transition: var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus { outline: none; border-color: var(--primary); }

/* Footer */
.footer { padding: 5rem 0 3rem; border-top: 1px solid var(--border-color); }
.footer .logo { margin-bottom: 1rem; display: block; font-size: 2rem; }
.footer-links { display: flex; justify-content: center; gap: 2rem; flex-wrap: wrap; }
.footer-links a { color: var(--text-muted); font-weight: 600; }
.footer-links a:hover { color: var(--primary); }
.social-links { display: flex; justify-content: center; gap: 1.5rem; }
.social-links a { color: var(--text-main); transition: var(--transition); }
.social-links a:hover { color: var(--secondary); transform: scale(1.1); }

/* Animations */
.fade-in { opacity: 0; transform: translateY(30px); transition: opacity 0.8s cubic-bezier(0.16, 1, 0.3, 1), transform 0.8s cubic-bezier(0.16, 1, 0.3, 1); }
.fade-in.appear { opacity: 1; transform: translateY(0); }

/* Responsive */
@media (max-width: 1024px) {
  .headline { font-size: 3.5rem; }
  .section-title { font-size: 2.5rem; }
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .hero-stats { flex-direction: column; gap: 0; }
  .item-border { border-left: none; border-top: 1px solid var(--border-color); }
}

@media (max-width: 768px) {
  .headline { font-size: 2.75rem; }
  .section-title { font-size: 2.25rem; }
  .subheadline { font-size: 1.125rem; }
  .grid-2, .grid-3 { grid-template-columns: 1fr; }
  .nav-links {
    display: none; position: absolute; top: 80px; left: 0; right: 0;
    background: var(--card-bg); flex-direction: column; padding: 2rem;
    box-shadow: 0 10px 20px rgba(0,0,0,0.1); border-bottom: 1px solid var(--border-color);
  }
  .nav.active .nav-links { display: flex; }
  .menu-toggle { display: block; }
  .nav .btn-primary { display: none; }
  .contact-info { padding-right: 0; margin-bottom: 3rem; }
  .section { padding: 4rem 0; }
  .hero { padding: 8rem 0 4rem; }
}

@media (max-width: 480px) {
  .headline { font-size: 2.25rem; }
  .cta-group { flex-direction: column; }
  .grid-4 { grid-template-columns: 1fr; }
  .card, .contact-form-wrap { padding: 2rem 1.5rem; }
}