/* ===== งานแบคโฮ.com - Stylesheet ===== */
:root {
  --primary: #f5a623;      /* เหลืองก่อสร้าง */
  --primary-dark: #d4881a;
  --dark: #1f2733;
  --dark-2: #2b3646;
  --gray: #5c6b7a;
  --light: #f4f6f8;
  --white: #ffffff;
  --radius: 10px;
  --shadow: 0 4px 18px rgba(0,0,0,.08);
}

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

body {
  font-family: "Segoe UI", "Sarabun", "Prompt", Tahoma, sans-serif;
  color: var(--dark);
  line-height: 1.7;
  background: var(--white);
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { width: 90%; max-width: 1100px; margin: 0 auto; }

/* ===== Navbar ===== */
.navbar {
  background: var(--dark);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: var(--shadow);
}
.navbar .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  padding: 14px 0;
}
.brand {
  color: var(--white);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: .3px;
}
.brand span { color: var(--primary); }
.nav-links {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
  list-style: none;
}
.nav-links a {
  color: #cdd5df;
  padding: 8px 14px;
  border-radius: 6px;
  font-size: .95rem;
  transition: .2s;
}
.nav-links a:hover { background: var(--dark-2); color: var(--white); }
.nav-links a.active { background: var(--primary); color: var(--dark); font-weight: 600; }

/* ===== Hero ===== */
.hero {
  background: linear-gradient(rgba(31,39,51,.78), rgba(31,39,51,.78)),
              url("https://images.unsplash.com/photo-1504307651254-35680f356dfd?auto=format&fit=crop&w=1400&q=80") center/cover;
  color: var(--white);
  text-align: center;
  padding: 90px 0;
}
.hero h1 { font-size: 2.5rem; margin-bottom: 16px; }
.hero p { font-size: 1.15rem; max-width: 720px; margin: 0 auto 28px; color: #e4e8ee; }

/* ===== Banner ===== */
.banner {
  position: relative;
  color: var(--white);
  padding: 70px 0;
  background: var(--dark) center/cover no-repeat;
}
.banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(31,39,51,.72);
}
/* ภาพพื้นหลังแยกตามหน้า */
.banner-home { background-image: url("../images/banner.jpg"); }
.banner-construction { background-image: url("../images/banner-construction.jpg"); }
.banner-land { background-image: url("../images/banner-land.jpg"); }
.banner-contact { background-image: url("../images/banner-contact.jpg"); }

.banner .container {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.6fr 1fr;
  gap: 40px;
  align-items: center;
}
.banner-text h1 { font-size: 2.4rem; line-height: 1.3; margin-bottom: 14px; }
.banner-text h1 span { color: var(--primary); }
.banner-text p { font-size: 1.1rem; color: #e4e8ee; margin-bottom: 22px; }

.banner-phones {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-bottom: 24px;
}
.phone-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  background: var(--primary);
  color: var(--dark);
  padding: 12px 22px;
  border-radius: 50px;
  font-size: 1.25rem;
  font-weight: 800;
  letter-spacing: .5px;
  box-shadow: var(--shadow);
}
.phone-chip::before { content: "\260E"; font-size: 1.1rem; }

/* การ์ด QR LINE */
.qr-card {
  background: var(--white);
  color: var(--dark);
  border-radius: var(--radius);
  padding: 22px;
  text-align: center;
  box-shadow: var(--shadow);
  max-width: 300px;
  margin: 0 auto;
}
.qr-card img {
  width: 100%;
  max-width: 230px;
  margin: 0 auto 12px;
  border: 6px solid var(--light);
  border-radius: 8px;
}
.qr-card .qr-title { font-weight: 800; font-size: 1.1rem; }
.qr-card .qr-sub { color: var(--gray); font-size: .92rem; margin-top: 2px; }

.page-header {
  background: var(--dark);
  color: var(--white);
  text-align: center;
  padding: 54px 0;
}
.page-header h1 { font-size: 2.1rem; }
.page-header p { color: #c4ccd6; margin-top: 8px; }

/* ===== Buttons ===== */
.btn {
  display: inline-block;
  background: var(--primary);
  color: var(--dark);
  padding: 13px 30px;
  border-radius: 50px;
  font-weight: 700;
  transition: .2s;
}
.btn:hover { background: var(--primary-dark); transform: translateY(-2px); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--primary);
  color: var(--primary);
}
.btn-outline:hover { background: var(--primary); color: var(--dark); }

/* ===== Sections ===== */
section { padding: 60px 0; }
.section-title { text-align: center; margin-bottom: 40px; }
.section-title h2 { font-size: 1.9rem; }
.section-title p { color: var(--gray); margin-top: 8px; }
.bg-light { background: var(--light); }

/* ===== Cards / Grid ===== */
.grid { display: grid; gap: 24px; }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
.grid-2 { grid-template-columns: repeat(2, 1fr); }

.card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 28px;
  box-shadow: var(--shadow);
  border-top: 4px solid var(--primary);
}
.card h3 { margin-bottom: 10px; font-size: 1.2rem; }
.card p { color: var(--gray); }

.icon {
  width: 54px; height: 54px;
  background: var(--primary);
  color: var(--dark);
  border-radius: 12px;
  display: flex; align-items: center; justify-content: center;
  font-size: 1.5rem; font-weight: 700;
  margin-bottom: 16px;
}

/* ===== Service list ===== */
.service-list { list-style: none; }
.service-list li {
  padding: 12px 0 12px 34px;
  position: relative;
  border-bottom: 1px solid #e5e9ee;
}
.service-list li::before {
  content: "✔";
  position: absolute; left: 0;
  color: var(--primary-dark); font-weight: 700;
}

/* ===== Split ===== */
.split { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; align-items: center; }
.split img { border-radius: var(--radius); box-shadow: var(--shadow); }

/* ===== CTA ===== */
.cta {
  background: var(--primary);
  color: var(--dark);
  text-align: center;
}
.cta h2 { font-size: 1.8rem; margin-bottom: 12px; }
.cta .btn { background: var(--dark); color: var(--white); }
.cta .btn:hover { background: var(--dark-2); }

/* ===== Contact ===== */
.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 40px; }
.info-item { display: flex; gap: 14px; margin-bottom: 22px; align-items: flex-start; }
.info-item .icon { flex: 0 0 auto; width: 46px; height: 46px; font-size: 1.2rem; }
.info-item h4 { font-size: 1.05rem; }
.info-item p { color: var(--gray); }

.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; }
.form-group input,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid #cfd6de;
  border-radius: 8px;
  font-family: inherit;
  font-size: 1rem;
}
.form-group textarea { resize: vertical; min-height: 120px; }

/* ===== Footer ===== */
.footer {
  background: var(--dark);
  color: #b9c2cd;
  padding: 46px 0 22px;
}
.footer-grid { display: grid; grid-template-columns: 2fr 1fr 1fr; gap: 30px; }
.footer h4 { color: var(--white); margin-bottom: 14px; }
.footer a { display: block; color: #b9c2cd; padding: 4px 0; }
.footer a:hover { color: var(--primary); }
.footer-bottom {
  text-align: center;
  border-top: 1px solid var(--dark-2);
  margin-top: 30px; padding-top: 18px;
  font-size: .9rem; color: #8b96a3;
}

/* ===== Responsive ===== */
@media (max-width: 820px) {
  .grid-3, .grid-2, .split, .contact-grid, .footer-grid,
  .banner .container {
    grid-template-columns: 1fr;
  }
  .banner-text { text-align: center; }
  .banner-phones { justify-content: center; }
  .hero h1 { font-size: 1.9rem; }
  .banner-text h1 { font-size: 1.9rem; }
  .navbar .container { justify-content: center; text-align: center; }
  .nav-links { justify-content: center; }
}