/* ==========================================================================
   1. RESET & BASE STYLES
   ========================================================================== */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, "Helvetica Neue", Arial, sans-serif;
  background-color: #F8F6F2;
  color: #2C3531;
  line-height: 1.8;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

a {
  color: #4A5D4E;
  text-decoration: none;
  transition: all 0.2s ease-in-out;
}

a:hover {
  color: #C5A059;
}

/* บังคับสื่อและรูปภาพย่อตามหน้าจอมือถือ ไม่ล้นขอบ */
img, video, iframe {
  max-width: 100% !important;
  height: auto !important;
  display: block;
}

/* ==========================================================================
   2. HEADER & NAVIGATION (แบบ A: เมนูอยู่ตรงกลาง ไม่กองชิดขวา)
   ========================================================================== */
header {
  background-color: #FFFFFF;
  border-bottom: 1px solid #E5E0D8;
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 1.2rem 2rem;
  display: flex;
  align-items: center;
}

/* โลโก้อยู่ซ้ายสุด */
.logo {
  flex: 0 0 auto;
}

.logo a {
  font-size: 1.5rem;
  font-weight: 700;
  color: #2C3531;
  letter-spacing: 0.05em;
  text-decoration: none;
}

/* ดันกล่อง nav ให้ขยายเต็มพื้นที่ตรงกลาง */
.nav-container nav {
  flex: 1;
  display: flex;
  justify-content: center; /* จัดกลุ่มเมนูให้อยู่กึ่งกลาง */
  margin-right: 1.5rem;   /* ถ่วงน้ำหนักระยะห่างให้สมดุลกับโลโก้ซ้าย */
}

.nav-menu {
  display: flex;
  list-style: none;
  gap: 2rem;               /* ระยะห่างระหว่างเมนูกำลังพอดี */
  margin: 0;
  padding: 0;
  align-items: center;
}

.nav-menu li a {
  color: #1A1A1A;
  font-size: 1.05rem;
  letter-spacing: 0.03em;
  text-decoration: none;
  white-space: nowrap;    /* ป้องกันตัวอักษรตกบรรทัด */
  transition: color 0.2s ease;
}

.nav-menu li a:hover {
  color: #C5A059;
}

/* ==========================================================================
   3. HERO SECTION (รูปภาพและข้อความหน้าแรก)
   ========================================================================== */
.hero {
  text-align: center;
  padding: 3rem 1rem 1.5rem;
  max-width: 1000px;
  margin: 0 auto;
  width: 100%;
}

.hero h1 {
  font-size: 2.2rem;
  font-weight: 400;
  color: #2C3531;
  margin-bottom: 1.2rem;
  line-height: 1.5;
  letter-spacing: 0.08em;
  word-break: break-word;
}

.hero p {
  color: #666;
  font-size: 1rem;
  margin-bottom: 1.8rem;
  letter-spacing: 0.05em;
  line-height: 1.7;
}

.hero-img-container {
  width: 100%;
  max-width: 1000px;
  margin: 2rem auto 0;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(0,0,0,0.06);
}

.hero-img-container img {
  width: 100%;
  height: auto;
  display: block;
}

/* ==========================================================================
   4. LAYOUT & CONTAINERS
   ========================================================================== */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

.section-title {
  font-size: 1.8rem;
  font-weight: 500;
  color: #2C3531;
  margin-bottom: 2rem;
  text-align: left;
  letter-spacing: 0.05em;
}

/* ==========================================================================
   5. BUTTONS
   ========================================================================== */
.btn-primary {
  display: inline-block;
  background-color: #4A5D4E;
  color: #FFFFFF !important;
  padding: 0.8rem 2.2rem;
  border-radius: 25px;
  font-weight: 600;
  text-align: center;
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: background-color 0.2s ease, transform 0.1s ease;
}

.btn-primary:hover {
  background-color: #3B4A3E;
  transform: translateY(-1px);
}

/* ==========================================================================
   6. FOOTER
   ========================================================================== */
footer {
  background-color: #2C3531;
  color: #E5E0D8;
  padding: 3rem 1.5rem 1.5rem;
  margin-top: 4rem;
  text-align: center;
}

.footer-nav {
  display: flex;
  justify-content: center;
  list-style: none;
  gap: 1.8rem;
  margin-bottom: 1.5rem;
  padding: 0;
}

.footer-nav a {
  color: #C5C0B8;
  font-size: 0.9rem;
}

.footer-nav a:hover {
  color: #FFFFFF;
}

/* ==========================================================================
   7. RESPONSIVE DESIGN (เซ็ตแยกเด็ดขาดสำหรับจอมือถือ)
   ========================================================================== */
@media (max-width: 850px) {
  .nav-container {
    flex-direction: column;
    padding: 1rem 0.8rem;
    gap: 0.8rem;
  }

  .nav-container nav {
    margin-right: 0;
    width: 100%;
  }

  .nav-menu {
    gap: 0.8rem 1.2rem;
    flex-wrap: wrap;       /* บนมือถือให้ตัดเรียงเป็นแถวอย่างเป็นระเบียบ */
    justify-content: center;
  }

  .nav-menu li a {
    font-size: 0.95rem;
  }

  .hero {
    padding: 2rem 1rem 1rem;
  }

  .hero h1 {
    font-size: 1.45rem;
    line-height: 1.6;
  }

  .hero p {
    font-size: 0.88rem;
  }

  .hero-img-container {
    margin-top: 1.5rem;
    border-radius: 6px;
  }

  .container {
    padding: 2rem 1rem;
  }
}