/* ═══════════════════════════════════════
   RESET & BASE
═══════════════════════════════════════ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Segoe UI', Arial, sans-serif;
  background-color: #F8F3E7;
  color: #2F3437;
  font-size: 16px;
  line-height: 1.6;
}

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

a {
  text-decoration: none;
  color: inherit;
}

ul li {margin-left: 50px;}
/* ═══════════════════════════════════════
   HEADER
═══════════════════════════════════════ */
.site-header {
  background-color: #1D3557;
  color: #F8F3E7;
  padding: 16px 24px;
}

.header-container {
  display: flex;
  align-items: center;
  gap: 20px;
  max-width: 1200px;
  margin: 0 auto;
}

.logo {
  flex: 0 0 25%;
}

.logo img {
  width: 100%;
  height: auto;
  max-height: 160px;
  object-fit: contain;
  border-radius: 8px;
}

.header-text {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pagetitle {
  font-size: 1.6rem;
  font-weight: 700;
  color: #F1C40F;
  letter-spacing: 0.5px;
}

.tagline {
  font-size: 0.95rem;
  color: #F8F3E7;
  opacity: 0.85;
}


/* ═══════════════════════════════════════
   NAV
═══════════════════════════════════════ */
.home-nav {
  background-color: #1D3557;
  border-top: 2px solid #457B9D;
  padding: 0 24px;
  position: relative;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 4px;
  max-width: 1200px;
  margin: 0 auto;
}

.nav-list li a {
  display: block;
  padding: 14px 20px;
  font-size: 0.95rem;
  font-weight: 600;
  color: #F8F3E7;
  transition: background-color 0.2s, color 0.2s;
}

.home-nav-btn:hover {
  background-color: #E63946;
  color: #F8F3E7;
}

.hamburger {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 14px 0;
}

.hamburger span {
  display: block;
  width: 26px;
  height: 3px;
  background-color: #F8F3E7;
  border-radius: 2px;
  transition: transform 0.3s, opacity 0.3s;
}

.hamburger.active span:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}
.hamburger.active span:nth-child(2) {
  opacity: 0;
}
.hamburger.active span:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}




/* ═══════════════════════════════════════
   ARTICLE
═══════════════════════════════════════ */
.main-article {
  padding: 48px 24px;
  max-width: 1200px;
  margin: 0 auto;
}

.article-container {
  display: flex;
  gap: 32px;
}

.article-col {
  flex: 1;
  background-color: #fff;
  border-radius: 8px;
  padding: 28px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.07);
}

.article-col h2 {
  font-size: 1.25rem;
  color: #1D3557;
  margin-bottom: 12px;
}

/* ═══════════════════════════════════════
   SITE FOOTER
═══════════════════════════════════════ */
.site-footer {
  background-color: #2F3437;
  color: #F8F3E7;
  padding: 40px 24px 24px 24px;
}

.footer-container {
  display: flex;
  align-items: flex-start;
  justify-content: center;
  color: #F1C40F;
  gap: 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-col {
  text-align: left;
  color: #F1C40F;
  margin: 0 50px;
}

.footer-col a {
  color: #F1C40F;
  text-decoration: underline;
  transition: opacity 0.2s; 
	font-weight: normal;
	font-size: 0.9rem;
}

.footer-col a:hover {
  opacity: 0.50; 
}

.footer-col h3 {
  font-size: 1.05rem;
  color: #F1C40F;
  margin-bottom: 10px;
}

.footer-col p {
  
  opacity: 0.8;
  line-height: 1.6;
  }

.footer-credit {
  text-align: center;
  font-size: 0.8rem;
  opacity: 0.6;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
  max-width: 1200px;
  margin-left: auto;
  margin-right: auto;
}


/* ═══════════════════════════════════════
   RESPONSIVE — MOBILE
═══════════════════════════════════════ */
@media (max-width: 768px) {

  .header-container {
    flex-direction: column;
    align-items: center;
    gap: 10px;
  }

  .logo {
    flex: 0 0 auto;
    width: 100%;
  }

  .logo img {
    width: 100%;
    max-height: 200px;
    object-fit: cover;
    border-radius: 0;
  }

  .header-text {
    width: 100%;
    text-align: center;
  }

  .hamburger {
    display: flex;
  }

  .nav-list {
    display: none;
    flex-direction: column;
    width: 100%;
    padding-bottom: 8px;
  }

  .nav-list.open {
    display: flex;
  }

  .nav-list li a {
    padding: 12px 8px;
    border-top: 1px solid rgba(255,255,255,0.1);
  }

  .hero-title {
    font-size: 1.3rem;
    margin: 16px;
  }

  .article-container {
    flex-direction: column;
  }

  .footer-container {
    flex-direction: column;
  }
}


/* ═══════════════════════════════════════
   D-COURSE SECTION
═══════════════════════════════════════ */
.d-course {
  max-width: 1200px;
  margin: 48px auto;
  padding: 36px 32px;
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.07);
}

.d-course-title {
  font-size: 1.45rem;
  font-weight: 700;
  color: #1D3557;
  margin-bottom: 12px;
  border-bottom: 2px solid #457B9D;
  padding-bottom: 10px;
}

.d-course > p {
  font-size: 1rem;
  color: #2F3437;
  margin-bottom: 28px;
  max-width: 100%;
  line-height: 1.6;
}

.level-btn-group {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

.level-btn {
  display: inline-block;
  background-color: #F5B041;
  color: #2F3437;
  font-family: 'Segoe UI', Arial, sans-serif;
  font-size: 0.95rem;
  font-weight: 600;
  padding: 12px 32px;
  border-radius: 4px;
  text-decoration: none;
  transition: background-color 0.2s, color 0.2s;
}

.level-btn:hover {
  background-color: #1D3557;
  color: #F8F3E7;
}

.level-btn:active {
  background-color: #E63946;
  color: #F8F3E7;
}


/* ═══════════════════════════════════════
   D-COURSE RESPONSIVE
═══════════════════════════════════════ */
@media (max-width: 768px) {
  .d-course {
    margin: 24px 16px;
    padding: 24px 20px;
  }

  .level-btn-group {
    flex-direction: column;
    gap: 12px;
  }

  .level-btn {
    text-align: center;
    padding: 14px 24px;
  }
}