/* ========== Base ========== */
html, body { margin: 0; }
html { font-size: 18px; }
body {
  font-family: "Microsoft JhengHei", "Helvetica Neue", Arial, sans-serif;
  font-weight: bold;
  line-height: 1.7;
  color: #222;
}
.container { max-width: 1300px; margin: 0 auto; padding: 0 1rem; }

/* ========== Header / Nav ========== */
.header-bar {
  display: flex; align-items: center; justify-content: space-between;
  background: #eaeaea; padding: 0.5rem 1rem; border-bottom: 2px solid #003366;
  font-size: 1.1rem;
}
.header-bar .brand-name, .brand-name { font-size: 1.1rem; font-weight: bold; color: #003366; }
.logo-area { display: flex; align-items: center; gap: 0.5rem; }
.logo-area img { height: 45px; width: auto; }
.brand { display: flex; align-items: center; text-decoration: none; }
.nav-links ul { list-style: none; display: flex; gap: 1.5rem; margin: 0; padding: 0; }
.nav-links a { color: #003366; text-decoration: none; font-weight: bold; transition: color 0.3s; }
.nav-links a:hover { color: #0099ff; }

.menu-toggle, .back-btn {
  background: none; border: none; font-size: 1.4rem; color: #003366; cursor: pointer;
}
.menu-toggle { display: none; font-size: 1.5rem; transition: transform 0.3s ease, color 0.3s ease; }
.menu-toggle:active { transform: scale(0.9); color: #0099ff; }
.back-btn:hover { color: #0099ff; }

.desktop-only { display: flex; align-items: center; gap: 0.6rem; }
.nav-links.mobile-only { display: none; }

@media (min-width: 981px) { .mobile-only { display: none; } }
@media (max-width: 980px) {
  .desktop-only { display: none; }
  .menu-toggle { display: block; }
  .menu-controls.mobile-only { display: flex; align-items: center; gap: 0.6rem; }
  .nav-links.mobile-only { display: none; }
  .nav-links.mobile-only.show {
    display: flex; position: absolute; top: 60px; right: 0; background: #f8f8f8; width: 200px;
    border: 1px solid #ccc; flex-direction: column; padding: 1rem; gap: 1rem; z-index: 999;
  }
  .nav-links.mobile-only ul {
    display: flex; flex-direction: column; gap: 1rem; padding: 0; margin: 0; list-style: none; text-align: right;
  }
}

/* ========== Footer ========== */
.footer-bar {
  background: #003366; color: #fff; padding: 1.5rem; text-align: center; margin-top: 3rem;
}
.footer-bar p { margin: 0.3rem 0; font-size: 0.95rem; }
.footer-bar a { color: #ffdd00; text-decoration: none; word-break: break-all; }
.footer-bar a:hover { text-decoration: underline; }
@media (max-width: 600px) {
  .footer-content { font-size: 0.9rem; line-height: 1.5rem; }
  .footer-bar { padding: 1rem; }
}

/* ========== Generic Content ========== */
.contact-row {
  display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem; text-align: center; margin-bottom: 1rem;
}
.contact-row p { margin: 0; font-size: 0.95rem; }
@media (max-width: 600px) { .contact-row { flex-direction: column; align-items: center; } }

main section { max-width: 800px; margin: 2rem auto; line-height: 1.8; text-align: justify; }
main h1 { text-align: center; margin-bottom: 2rem; }
main h1, main h2 { font-size: 1.2rem; margin-bottom: 1rem; }
main p { font-size: 1rem; }

/* ========== Buttons ========== */
.btn {
  display: inline-block; padding: 0.5em 1.2em; background: #2a4896; color: #fff;
  text-decoration: none; border-radius: 6px; font-weight: bold; transition: background 0.3s;
}
.btn:hover { background: #1c3573; }

/* ========== Product cards ========== */
.product-card {
  display: flex; align-items: center; gap: 2rem; flex-wrap: wrap;
  border: 1px solid #e0e0e0; padding: 1.5rem; border-radius: 8px; margin: 2rem 0;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05); transition: box-shadow 0.3s ease;
}
.product-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.1); }
.product-card img, .product-img { width: 80px; flex-shrink: 0; }
.product-img { width: 120px; }
.product-info { flex: 1; min-width: 200px; text-align: left; }
.product-info h2 { font-size: 1.0rem; margin: 0 0 0.5rem 0; }
.product-info p { margin: 0 0 1rem 0; font-size: 0.9rem; }
.product-info .btn { display: inline-block; padding: 0.5em 1em; background: #2a4896; color: #fff; border-radius: 4px; }
@media (max-width: 600px) {
  .product-card { flex-direction: column; text-align: center; }
  .product-card h2 { margin: 0.5rem; }
}

/* ========== PDF list ========== */
.pdf-section { margin-top: 3rem; }
.pdf-section h2 { margin-bottom: 1rem; font-size: 1.2rem; }
.pdf-list { list-style: none; padding: 0; margin: 0; }
.pdf-list li { padding: 0.75rem 0; border-bottom: 1px solid #ddd; line-height: 1.6; }
.pdf-list li:last-child { border-bottom: none; }
.pdf-list a { color: #2a4896; text-decoration: none; display: block; }
.pdf-list a:hover { text-decoration: underline; }
.pdf-list a::before {
  font-family: "Font Awesome 6 Free"; font-weight: 900; content: "\f1c1";
  color: #d32f2f; margin-right: 8px; font-size: 1rem; vertical-align: middle;
}
@media (max-width: 768px) {
  .pdf-section h2 { font-size: 1.3rem; margin-top: 1.5rem; }
  .pdf-list { list-style: none; padding: 0; margin: 0; max-width: 800px; }
  .pdf-list li { padding: 1rem 0; border-bottom: 1px solid #ccc; }
  .pdf-list a { font-size: 0.9rem; }
}

/* ========== Ordering guide ========== */
.ordering-guide { max-width: 1200px; margin: 3rem auto; text-align: center; }
.ordering-guide h2 { margin-bottom: 1.5rem; }
.ordering-images { display: flex; flex-direction: column; align-items: center; gap: 1rem; }
.ordering-images img,
.ordering-guide img {
  max-width: 100%; height: auto; border-radius: 6px; box-shadow: 0 2px 6px rgba(0,0,0,0.1);
}
.ordering-note { margin-top: 1rem; font-size: 0.95rem; color: #555; text-align: center; }
.product-series-grid { flex: 1 1 60%; }
@media (max-width: 900px) {
  .dip-main-content { flex-direction: column; }
  .product-series-grid, .ordering-guide { flex: 1 1 100%; }
}

/* ========== Semiconductor cards ========== */
.semi-card {
  display: flex; flex-direction: column; align-items: center;
  background: #fff; border: 1px solid #ddd; border-radius: 12px; padding: 1.5rem; margin-bottom: 2rem;
  box-shadow: 0 3px 8px rgba(0,0,0,0.08); transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.semi-card:hover { transform: translateY(-4px); box-shadow: 0 6px 16px rgba(0,0,0,0.15); }
.semi-card h2 {
  font-size: 1.3rem; text-align: center; margin-bottom: 1rem; color: #003366;
  border-bottom: 2px solid #003366; padding-bottom: 0.4rem; width: 100%; max-width: 900px;
}
.semi-card img {
  width: 100%; max-width: 900px; max-height: 500px; object-fit: contain;
  border-radius: 10px; margin-bottom: 1rem;
}
.semi-info { width: 100%; text-align: left; }
.semi-info h2 { font-size: 1.25rem; margin-bottom: 0.5rem; color: #002d5a; text-align: left; }
.semi-info p { font-size: 1rem; line-height: 1.7; color: #222; }
@media (max-width: 900px) { .semi-card img { max-width: 100%; max-height: 400px; } }

/* ========== Home (index)  ========== */
.index-minimal {
  position: relative; overflow: hidden;
  text-align: center; letter-spacing: 0.6px;
  padding: 12vh 20px 12vh;

  background: url("/images/background.webp") center/cover no-repeat;
  background-attachment: fixed;
}
.index-minimal::before {
  content: ""; position: absolute; inset: 0; z-index: 0;
  background: rgba(255,255,255,0.85);
}
.index-minimal h1,
.index-minimal .tagline,
.index-nav { position: relative; z-index: 1; }

@media (max-width: 768px) {
  .index-minimal {
    background-attachment: scroll;
    background-position: left center;
    background-size: 160%;
  }
  .index-minimal::before { background: rgba(255,255,255,0.92); }
}