/* ============================================
   宇得國際企業網站 - Tech Indigo Design System
   ============================================ */

/* --- Custom Properties --- */
:root {
  --color-primary: #0F1B3D;
  --color-accent: #3B82F6;
  --color-accent-light: #60A5FA;
  --color-bg: #F8FAFC;
  --color-text-light: #E2E8F0;
  --color-text-dark: #0F172A;
  --color-card: #FFFFFF;
  --color-divider: #1E3A6E;
  --color-accent-hover: #2563EB;
  --font-en: 'Outfit', system-ui, -apple-system, sans-serif;
  --font-zh: 'Noto Sans TC', 'Microsoft JhengHei', sans-serif;
  --max-width: 1200px;
  --header-height: 72px;
  --radius: 8px;
  --shadow: 0 2px 8px rgba(15, 27, 61, 0.08);
  --shadow-lg: 0 8px 32px rgba(15, 27, 61, 0.12);
  --transition: 0.25s ease;
}

/* --- Reset --- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-zh);
  color: var(--color-text-dark);
  background: var(--color-bg);
  line-height: 1.7;
  font-size: clamp(15px, 1vw + 12px, 17px);
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: var(--color-accent); text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-accent-hover); }
ul { list-style: none; }
h1, h2, h3, h4 { font-family: var(--font-en); line-height: 1.3; }

/* --- Layout --- */
.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

/* --- Header / Nav --- */
.site-header {
  background: var(--color-primary);
  position: sticky;
  top: 0;
  z-index: 100;
  box-shadow: 0 2px 12px rgba(0,0,0,0.15);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.logo-group {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-group img {
  height: 44px;
  width: auto;
}
.logo-text {
  display: flex;
  flex-direction: column;
}
.logo-text .company-name {
  font-family: var(--font-zh);
  font-size: 16px;
  font-weight: 700;
  color: #FFFFFF;
  letter-spacing: 0.5px;
}
.logo-text .company-name-en {
  font-family: var(--font-en);
  font-size: 11px;
  font-weight: 400;
  color: var(--color-text-light);
  opacity: 0.7;
  letter-spacing: 0.3px;
}

/* Desktop Nav */
.main-nav { display: flex; align-items: center; gap: 8px; }
.main-nav a {
  color: var(--color-text-light);
  font-size: 15px;
  font-weight: 500;
  padding: 8px 16px;
  border-radius: var(--radius);
  transition: all var(--transition);
  white-space: nowrap;
}
.main-nav a:hover,
.main-nav a[aria-current="page"] {
  color: #FFFFFF;
  background: var(--color-divider);
}
.lang-switch {
  color: var(--color-accent-light);
  font-size: 13px;
  margin-left: 12px;
  padding: 6px 12px;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius);
}
.lang-switch:hover { background: var(--color-divider); color: #FFF; }

/* Hamburger (CSS only) */
.nav-toggle { display: none; }
.hamburger {
  display: none;
  cursor: pointer;
  width: 32px;
  height: 24px;
  position: relative;
  flex-shrink: 0;
}
.hamburger span,
.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  left: 0;
  width: 100%;
  height: 3px;
  background: #FFF;
  border-radius: 2px;
  transition: all 0.3s;
}
.hamburger::before { top: 0; }
.hamburger span { top: 50%; transform: translateY(-50%); }
.hamburger::after { bottom: 0; }
.nav-toggle:checked ~ .hamburger::before { top: 50%; transform: translateY(-50%) rotate(45deg); }
.nav-toggle:checked ~ .hamburger span { opacity: 0; }
.nav-toggle:checked ~ .hamburger::after { bottom: 50%; transform: translateY(50%) rotate(-45deg); }

/* --- Hero --- */
.hero {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-divider) 50%, var(--color-primary) 100%);
  padding: clamp(48px, 8vw, 96px) 24px;
  text-align: center;
  color: #FFF;
}
.hero h1 {
  font-size: clamp(28px, 4vw, 48px);
  font-weight: 700;
  margin-bottom: 16px;
  font-family: var(--font-zh);
}
.hero p {
  font-size: clamp(16px, 2vw, 20px);
  color: var(--color-text-light);
  max-width: 720px;
  margin: 0 auto 32px;
  opacity: 0.9;
}
.btn {
  display: inline-block;
  padding: 14px 32px;
  background: var(--color-accent);
  color: #FFF;
  font-weight: 600;
  font-size: 16px;
  border-radius: var(--radius);
  transition: all var(--transition);
  border: none;
  cursor: pointer;
}
.btn:hover { background: var(--color-accent-hover); color: #FFF; transform: translateY(-2px); box-shadow: 0 4px 16px rgba(59, 130, 246, 0.3); }
.btn-outline {
  background: transparent;
  border: 2px solid var(--color-accent-light);
  color: var(--color-accent-light);
}
.btn-outline:hover { background: var(--color-accent); border-color: var(--color-accent); color: #FFF; }

/* --- Page Banner (inner pages) --- */
.page-banner {
  background: linear-gradient(135deg, var(--color-primary), var(--color-divider));
  padding: clamp(32px, 5vw, 64px) 24px;
  text-align: center;
  color: #FFF;
}
.page-banner h1 {
  font-size: clamp(24px, 3.5vw, 40px);
  font-weight: 700;
  font-family: var(--font-zh);
}
.page-banner p {
  color: var(--color-text-light);
  opacity: 0.8;
  margin-top: 8px;
  font-size: 16px;
}

/* --- Section --- */
.section {
  padding: clamp(48px, 6vw, 80px) 0;
}
.section-title {
  font-size: clamp(22px, 3vw, 32px);
  font-weight: 700;
  text-align: center;
  margin-bottom: 40px;
  color: var(--color-primary);
  font-family: var(--font-zh);
}
.section-dark {
  background: var(--color-primary);
  color: #FFF;
}
.section-dark .section-title { color: #FFF; }

/* --- Partners Bar --- */
.partners {
  padding: 40px 0;
  background: var(--color-card);
  border-bottom: 1px solid #E2E8F0;
}
.partners-grid {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: clamp(16px, 3vw, 40px);
  flex-wrap: wrap;
}
.partners-grid a {
  display: block;
  transition: transform var(--transition);
}
.partners-grid a:hover { transform: scale(1.1); }
.partners-grid img {
  height: clamp(40px, 5vw, 60px);
  width: auto;
  object-fit: contain;
  filter: grayscale(30%);
  transition: filter var(--transition);
}
.partners-grid a:hover img { filter: grayscale(0%); }

/* --- Product Grid (homepage parts) --- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 16px;
}
.products-grid img {
  border-radius: var(--radius);
  transition: transform var(--transition), box-shadow var(--transition);
  box-shadow: var(--shadow);
}
.products-grid img:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

/* --- Brand Cards (product page) --- */
.brand-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 24px;
}
.brand-card {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 32px;
  box-shadow: var(--shadow);
  transition: transform var(--transition), box-shadow var(--transition);
  border: 1px solid #E2E8F0;
}
.brand-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}
.brand-card img {
  height: 48px;
  width: auto;
  object-fit: contain;
  margin-bottom: 16px;
}
.brand-card h3 {
  font-size: 18px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
  font-family: var(--font-zh);
}
.brand-card ul {
  margin-bottom: 16px;
}
.brand-card li {
  font-size: 14px;
  color: #64748B;
  padding: 2px 0;
  padding-left: 16px;
  position: relative;
}
.brand-card li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}
.brand-card .card-link {
  font-size: 14px;
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.brand-card .card-link::after { content: ' \2192'; }

/* --- About page product list --- */
.product-list-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 12px;
}
.product-list-grid li {
  padding: 12px 16px;
  border-left: 3px solid var(--color-accent);
  background: var(--color-card);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 15px;
}

/* --- Contact --- */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 40px;
  align-items: start;
}
.contact-info h3 {
  font-size: 20px;
  font-weight: 600;
  margin-bottom: 20px;
  color: var(--color-primary);
  font-family: var(--font-zh);
}
.contact-info p {
  margin-bottom: 12px;
  color: #475569;
  line-height: 1.8;
}
.contact-info strong { color: var(--color-text-dark); }
.contact-map iframe {
  width: 100%;
  height: 400px;
  border: none;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}
.email-btn {
  display: inline-block;
  margin-top: 20px;
  padding: 12px 28px;
  background: var(--color-accent);
  color: #FFF;
  font-weight: 600;
  font-size: 15px;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.email-btn:hover { background: var(--color-accent-hover); color: #FFF; transform: translateY(-2px); }

/* --- Brand Detail Page --- */
.brand-nav {
  background: var(--color-card);
  border-bottom: 1px solid #E2E8F0;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.brand-nav-inner {
  display: flex;
  gap: 4px;
  padding: 8px 0;
  max-width: var(--max-width);
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}
.brand-nav a {
  padding: 8px 16px;
  font-size: 13px;
  color: #64748B;
  white-space: nowrap;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.brand-nav a:hover,
.brand-nav a[aria-current="page"] {
  background: var(--color-accent);
  color: #FFF;
}
.brand-detail {
  max-width: 800px;
  margin: 0 auto;
}
.brand-detail-header {
  display: flex;
  align-items: center;
  gap: 24px;
  margin-bottom: 32px;
}
.brand-detail-header img {
  height: 64px;
  width: auto;
  object-fit: contain;
}
.brand-detail h2 {
  font-size: 24px;
  font-weight: 700;
  color: var(--color-primary);
  font-family: var(--font-zh);
}
.brand-detail h2 small {
  display: block;
  font-size: 14px;
  font-weight: 400;
  color: #64748B;
  margin-top: 4px;
}
.brand-detail-products {
  margin: 24px 0;
}
.brand-detail-products h3 {
  font-size: 18px;
  margin-bottom: 16px;
  color: var(--color-primary);
  font-family: var(--font-zh);
}
.brand-detail-products ul {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 8px;
}
.brand-detail-products li {
  padding: 10px 16px;
  background: var(--color-card);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 14px;
  box-shadow: var(--shadow);
}
.brand-external-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin-top: 24px;
  padding: 14px 28px;
  background: var(--color-primary);
  color: #FFF;
  font-weight: 600;
  border-radius: var(--radius);
  transition: all var(--transition);
}
.brand-external-link:hover {
  background: var(--color-divider);
  color: #FFF;
  transform: translateY(-2px);
}
.brand-images { margin: 24px 0; }
.brand-images img {
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  margin-bottom: 16px;
}

/* --- CTA Section --- */
.cta-section {
  text-align: center;
  padding: clamp(48px, 6vw, 80px) 24px;
}
.cta-section h2 {
  font-size: clamp(22px, 3vw, 32px);
  margin-bottom: 16px;
  font-family: var(--font-zh);
}
.cta-section p {
  color: var(--color-text-light);
  margin-bottom: 24px;
  opacity: 0.85;
}

/* --- Footer --- */
.site-footer {
  background: var(--color-primary);
  color: var(--color-text-light);
  padding: 32px 0;
  text-align: center;
  font-size: 14px;
  border-top: 1px solid var(--color-divider);
}
.site-footer p { opacity: 0.7; }

/* --- Partners Title --- */
.partners-title {
  font-size: clamp(18px, 2.5vw, 24px);
  font-weight: 700;
  text-align: center;
  color: var(--color-primary);
  margin-bottom: 24px;
  font-family: var(--font-zh);
}

/* --- Industry Tags --- */
.industry-tags {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
  margin-bottom: 40px;
}
.industry-tag {
  display: inline-block;
  padding: 8px 20px;
  background: var(--color-primary);
  color: #FFF;
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
}

/* --- Product Category Table --- */
.product-categories {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 24px;
}
.product-category {
  background: var(--color-card);
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  border: 1px solid #E2E8F0;
}
.product-category h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--color-accent);
  font-family: var(--font-zh);
}
.product-category li {
  font-size: 14px;
  color: #475569;
  padding: 4px 0 4px 16px;
  position: relative;
}
.product-category li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 6px;
  background: var(--color-accent);
  border-radius: 50%;
}

/* --- Utility --- */
.text-center { text-align: center; }
.mt-8 { margin-top: 8px; }
.mt-16 { margin-top: 16px; }
.mt-24 { margin-top: 24px; }
.mt-32 { margin-top: 32px; }
.mb-16 { margin-bottom: 16px; }
.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
}

/* --- Media Queries --- */
@media (max-width: 768px) {
  .hamburger { display: block; }
  .nav-area {
    position: absolute;
    top: var(--header-height);
    left: 0;
    right: 0;
    background: var(--color-primary);
    border-top: 1px solid var(--color-divider);
    padding: 16px 24px;
    display: none;
    box-shadow: 0 8px 24px rgba(0,0,0,0.2);
  }
  .nav-toggle:checked ~ .nav-area { display: block; }
  .main-nav {
    flex-direction: column;
    gap: 4px;
  }
  .main-nav a {
    display: block;
    padding: 12px 16px;
    font-size: 16px;
  }
  .lang-switch {
    margin-left: 0;
    margin-top: 8px;
    display: inline-block;
  }
  .contact-grid { grid-template-columns: 1fr; }
  .brand-grid { grid-template-columns: 1fr; }
  .brand-detail-header { flex-direction: column; align-items: flex-start; }
  .products-grid { grid-template-columns: repeat(auto-fill, minmax(140px, 1fr)); gap: 12px; }
}

@media (max-width: 480px) {
  .logo-text .company-name { font-size: 14px; }
  .logo-text .company-name-en { font-size: 10px; }
  .logo-group img { height: 36px; }
  .products-grid { grid-template-columns: repeat(auto-fill, minmax(120px, 1fr)); gap: 8px; }
  .product-list-grid { grid-template-columns: 1fr; }
  .brand-nav-inner { gap: 2px; }
  .brand-nav a { padding: 6px 10px; font-size: 12px; }
}