:root {
  --primary-color: #10b981; /* Xanh lá sáng */
  --primary-dark: #059669;
  --secondary-color: #f59e0b; /* Vàng */
  --secondary-hover: #d97706;
  --text-main: #1f2937;
  --text-muted: #4b5563;
  --bg-light: #f3f4f6;
  --bg-white: #ffffff;
  --border-color: #e5e7eb;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  --shadow-hover: 0 10px 15px rgba(0, 0, 0, 0.1);
  --border-radius: 12px;
  --transition: all 0.3s ease;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: 'Inter', 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--text-main);
  background-color: var(--bg-light);
}

a {
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

ul {
  list-style: none;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

/* Header */
header {
  background: var(--primary-color);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 15px 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  font-size: 1.8rem;
  font-weight: 800;
  color: var(--bg-white);
}

.nav-links {
  display: flex;
  gap: 20px;
}

.nav-links li a {
  font-weight: 600;
  color: var(--bg-white);
  padding: 10px;
}

.nav-links li a:hover {
  color: var(--secondary-color);
}

.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--bg-white);
}

/* Button */
.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: var(--border-radius);
  font-weight: 600;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  border: none;
}

.btn-primary {
  background: var(--secondary-color);
  color: var(--bg-white);
  box-shadow: var(--shadow);
}

.btn-primary:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
  background: var(--secondary-hover);
  color: var(--bg-white);
}

/* Hero Section */
.hero {
  position: relative;
  background: linear-gradient(135deg, rgba(16, 185, 129, 0.8) 0%, rgba(255, 255, 255, 0.8) 50%, rgba(245, 158, 11, 0.8) 100%);
  color: var(--text-main);
  padding: 100px 0;
  text-align: center;
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  z-index: 0;
}

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  color: #064e3b; /* Xanh lá cực đậm để dễ đọc */
  text-shadow: 2px 2px 8px rgba(255,255,255,0.9);
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  color: #1f2937;
  font-weight: 600;
  text-shadow: 1px 1px 5px rgba(255,255,255,0.9);
}

/* Services Grid */
.section {
  padding: 80px 0;
}

.section-title {
  text-align: center;
  font-size: 2.2rem;
  margin-bottom: 40px;
  color: var(--primary-color);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 30px;
}

.service-card {
  background: var(--bg-white);
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  border: 1px solid var(--border-color);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.service-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.service-content {
  padding: 20px;
}

.service-content h3 {
  margin-bottom: 10px;
  color: var(--primary-color);
}

.service-content p {
  color: var(--text-muted);
  margin-bottom: 15px;
}

/* Booking Form */
.booking-section {
  background: linear-gradient(135deg, var(--primary-color) 0%, #ffffff 50%, var(--secondary-color) 100%);
  color: var(--text-main);
  position: relative;
  overflow: hidden;
}

.booking-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 80% 20%, rgba(255, 255, 255, 0.5) 0%, transparent 60%);
  pointer-events: none;
}

.booking-section::after {
  content: '';
  position: absolute;
  bottom: 0;
  right: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 20% 80%, rgba(255, 255, 255, 0.5) 0%, transparent 60%);
  pointer-events: none;
}

.booking-section .section-title {
  color: #064e3b !important; /* Xanh lá cực đậm */
  position: relative;
  z-index: 1;
  text-shadow: 1px 1px 2px rgba(255,255,255,0.8);
}

.booking-form {
  background: rgba(255, 255, 255, 0.4);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: 40px;
  border-radius: var(--border-radius);
  max-width: 600px;
  margin: 0 auto;
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: 0 15px 35px rgba(0,0,0,0.1);
  position: relative;
  z-index: 1;
}

.form-group {
  margin-bottom: 20px;
}

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
}

.form-control {
  width: 100%;
  padding: 12px;
  border: 1px solid rgba(255,255,255,0.2);
  border-radius: var(--border-radius);
  background: rgba(255, 255, 255, 0.9);
  color: var(--text-main);
  font-family: inherit;
}

/* Pricing Table */
.pricing-table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: 30px;
  background: var(--bg-white);
  box-shadow: var(--shadow);
  border-radius: var(--border-radius);
  overflow: hidden;
}

.pricing-table th,
.pricing-table td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}

.pricing-table th {
  background: var(--primary-color);
  color: var(--bg-white);
}

/* Footer */
footer {
  background: var(--primary-dark);
  color: var(--bg-light);
  padding: 60px 0 20px;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  margin-bottom: 40px;
}

.footer-col h3 {
  margin-bottom: 20px;
  color: var(--secondary-color);
}

.footer-col p, .footer-col ul li {
  margin-bottom: 10px;
  color: var(--bg-light);
}

.footer-col a:hover {
  color: var(--secondary-hover);
}

.footer-bottom {
  text-align: center;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  color: var(--bg-light);
}

/* Page Header (for subpages) */
.page-header {
  background: linear-gradient(135deg, var(--primary-color) 0%, #ffffff 50%, var(--secondary-color) 100%);
  color: var(--primary-dark);
  padding: 60px 0;
  text-align: center;
}

/* Responsive */
@media (max-width: 768px) {
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background: var(--primary-color);
    box-shadow: var(--shadow);
    padding: 20px;
  }

  .nav-links.active {
    display: flex;
  }

  .mobile-menu-btn {
    display: block;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
}