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

body {
  font-family: "Segoe UI", "Noto Sans Thai", sans-serif;
  color: #1c2b3a;
  background: #f5f8fa;
  line-height: 1.6;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 30px;
  background: #fff;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
  position: sticky;
  top: 0;
  z-index: 10;
}

.nav-logo {
  font-weight: 700;
  font-size: 1.1rem;
  color: #1a4d7a;
}

.nav-links {
  display: flex;
  align-items: center;
}

.nav-links a {
  margin-left: 20px;
  text-decoration: none;
  color: #1c2b3a;
  font-size: 0.9rem;
}

#lang-toggle {
  margin-left: 20px;
  padding: 6px 14px;
  border-radius: 16px;
  border: 1px solid #1a4d7a;
  background: #fff;
  color: #1a4d7a;
  cursor: pointer;
  font-size: 0.85rem;
}

.hero {
  text-align: center;
  padding: 90px 20px 70px;
  background: linear-gradient(135deg, #234e70, #1a4d7a);
  color: #fff;
}

.hero h1 {
  font-size: 2rem;
  margin-bottom: 14px;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}

.tagline {
  font-size: 1.05rem;
  opacity: 0.95;
  margin-bottom: 26px;
}

.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: 6px;
  text-decoration: none;
  font-weight: 600;
  background: #fff;
  color: #1a4d7a;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 60px 20px;
}

section {
  margin-bottom: 60px;
}

h2 {
  text-align: center;
  margin-bottom: 26px;
  font-size: 1.6rem;
  color: #1a4d7a;
}

.about p {
  max-width: 700px;
  margin: 0 auto;
  text-align: center;
}

.service-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}

.service-card {
  background: #fff;
  border-radius: 10px;
  padding: 24px;
  text-align: center;
  font-size: 2rem;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.05);
}

.service-card span {
  display: block;
  font-size: 0.9rem;
  margin-top: 10px;
  color: #34495e;
}

.work p {
  text-align: center;
  max-width: 700px;
  margin: 0 auto 20px;
}

.cert-badges {
  display: flex;
  gap: 12px;
  justify-content: center;
  flex-wrap: wrap;
}

.cert-badges span {
  background: #e6eef4;
  color: #1a4d7a;
  padding: 8px 16px;
  border-radius: 20px;
  font-size: 0.85rem;
  font-weight: 600;
}

.contact {
  text-align: center;
}

.contact p {
  margin-bottom: 8px;
}

.quote-form {
  margin-top: 20px;
  display: flex;
  flex-direction: column;
  gap: 10px;
  max-width: 420px;
  margin-left: auto;
  margin-right: auto;
}

.quote-form input,
.quote-form textarea {
  padding: 10px 14px;
  border: 1px solid #d3dce6;
  border-radius: 8px;
  font-size: 0.9rem;
  font-family: inherit;
}

.quote-form textarea {
  min-height: 80px;
  resize: vertical;
}

.quote-form button {
  padding: 12px 20px;
  border: none;
  border-radius: 8px;
  background: #1a4d7a;
  color: #fff;
  cursor: pointer;
  font-weight: 600;
}

footer {
  text-align: center;
  padding: 20px;
  color: #7b8794;
  font-size: 0.85rem;
  background: #fff;
}