:root {
  --bg: #ffffff;
  --text: #222222;
  --muted: #666666;
  --accent: #1e3a8a;
  --accent2: #4c2a85;
  --border: #e0e0e0;
  --topbar-bg: #ffffff;
  --nav-bg: #ffffff;
  --hero-grad-1: #0a1a6b;
  --hero-grad-2: #3a2a8c;
  --hero-grad-3: #1e3a8a;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Noto Sans TC", "Helvetica Neue", Arial, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
.site-header {
  display: block;
  border-bottom: 3px solid var(--accent);
  background: var(--topbar-bg);
}
.topbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 40px;
}
.brand-logo { display:flex; align-items:center; gap:12px; }
.logo-img { width:56px; height:56px; border-radius:50%; border:2px solid var(--accent); object-fit:cover; }
.brand-text h1 { font-size:1.25rem; margin:0; line-height:1.2; }
.brand-text #site-subtitle { font-size:0.6rem; color:var(--muted); display:block; }
.topbar-right { display:flex; align-items:center; gap:16px; }
.search-box { display:flex; align-items:center; gap:8px; border:1px solid #ccc; padding:6px 10px; border-radius:4px; }
.search-box[hidden] { display:none; }
.search-box input { border:none; outline:none; }
.main-nav { border-top:1px solid var(--border); }
.main-nav ul { list-style:none; display:flex; gap:32px; margin:0; padding:14px 40px; font-size:18px; }
.main-nav li { cursor:pointer; }
.main-nav li.active { color: var(--accent2); font-weight:700; border-bottom:2px solid var(--accent); }
.lang-btn {
  background: none;
  border: 1px solid var(--border);
  padding: 0.25rem 0.6rem;
  border-radius: 0.375rem;
  cursor: pointer;
}
.lang-btn.active { background: var(--accent); color: white; border-color: var(--accent); }

.hero {
  position:relative;
  height:173px;
  background: linear-gradient(135deg, var(--hero-grad-1), var(--hero-grad-2), var(--hero-grad-3));
  overflow:hidden;
}
.hero::before {
  content:"";
  position:absolute; inset:0;
  background-image: var(--hero-bg, url('../images/sika-banner.png'));
  background-position: center;
  background-repeat: no-repeat;
  background-size: contain;
  opacity:1; mix-blend-mode:normal;
}
.hero-overlay { position:absolute; inset:0; background:linear-gradient(to right, rgba(0,0,0,.5), rgba(0,0,0,.2)); }
.hero-caption {
  position:absolute; left:40px; bottom:20px;
  background:rgba(60,30,100,.85); color:#fff; padding:12px 20px; border:2px solid #fff;
}
.hero-caption h2 { font-size:18px; }
.hero-dots { position:absolute; left:50%; transform:translateX(-50%); bottom:10px; display:flex; gap:8px; }
.hero-dots span { width:12px; height:12px; border-radius:50%; background:#ddd; }
.hero-dots span.active { background:#60a5fa; }

.info-tabs {
  background:#333; color:#fff; display:grid; grid-template-columns:repeat(3,1fr); text-align:center; padding:26px 0;
}
.info-tab h3 { font-size:24px; margin:0; }
.info-tab p { font-size:14px; color:#bbb; margin:6px 0 0; }

.topic-nav { border-bottom:1px solid var(--border); background:#f9f9f9; }
.tabs { list-style:none; display:flex; gap:0.5rem; margin:0; padding:0.75rem 1.5rem; flex-wrap:wrap; }
.tabs li button {
  background:none; border:1px solid transparent; padding:0.5rem 0.75rem; border-radius:0.375rem; cursor:pointer;
}
.tabs li button[aria-selected="true"] { border-color:var(--accent); background:#eef6fc; }

.site-main { padding: 1.5rem; max-width: 1000px; margin: 0 auto; }
.home-layout { display: grid; grid-template-columns: 2fr 1fr; gap: 2rem; align-items: start; margin-bottom: 2rem; }
@media (max-width: 900px) {
  .home-layout { grid-template-columns: 1fr; }
}
.intro { margin-bottom: 2rem; }
.intro-subheading { font-size: 1.25rem; font-weight: 700; color: var(--accent2); margin: 1.5rem 0 0.75rem; }
.members-table-wrap { margin: 2rem 0; }
.member-table { width: 100%; border-collapse: collapse; margin-top: 0.5rem; }
.member-table th, .member-table td { border: 1px solid var(--border); padding: 0.75rem 1rem; text-align: left; vertical-align: top; }
.member-table th { background: var(--accent); color: #fff; }
.member-table tr:nth-child(even) td { background: #f7f9fc; }
.news ul, .journals ul { list-style: none; padding: 0; margin: 0; }
.journal-item { line-height: 1.5; }
.journal-item strong { display: block; font-size: 1.05rem; }
.journal-item small { color: var(--muted); display: block; }
.news li, .journals li { padding: 0.75rem 0; border-bottom: 1px solid var(--border); }
.news li a, .journals li a { color: var(--accent); text-decoration: none; }
.news li a:hover, .journals li a:hover { text-decoration: underline; }
.news-toggle { display: flex; gap: 1rem; align-items: baseline; width: 100%; padding: 0; border: 0; background: transparent; color: var(--accent); font: inherit; text-align: left; cursor: pointer; }
.news-toggle:hover .news-title, .news-toggle:focus-visible .news-title { text-decoration: underline; }
.news-toggle:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; }
.news-toggle time { flex: 0 0 auto; color: var(--muted); font-size: 0.9rem; }
.news-title { font-weight: 700; }
.news-content { padding: 0.75rem 0 0 7rem; line-height: 1.7; }
.news-content p { margin: 0 0 1rem; }
@media (max-width: 600px) {
  .news-toggle { gap: 0.75rem; }
  .news-content { padding-left: 0; }
}
.journal-controls { margin: 0.75rem 0; }
.site-footer { text-align: center; padding: 2rem 1rem; color: var(--muted); font-size: 0.875rem; border-top: 1px solid var(--border); margin-top: 2rem; }

.society { background: #f9f9fc; border: 1px solid var(--border); border-radius: 8px; padding: 1rem; }
.society h2 { font-size: 1.1rem; margin-top: 0; color: var(--accent2); }
.society h3 { font-size: 1rem; margin: 1rem 0 0.5rem; color: var(--accent); }
.society ul { list-style: none; padding: 0; margin: 0; }
.society li { padding: 0.5rem 0; border-bottom: 1px dashed var(--border); }
.society li:last-child { border-bottom: none; }
.society a { color: var(--accent); text-decoration: none; }
.society a:hover { text-decoration: underline; }
.society .meta { font-size: 0.85rem; color: var(--muted); }

.search-results {
  max-width: 1000px;
  margin: 2rem auto;
  padding: 0 1.5rem;
}
.search-results h3 { color: var(--accent2); margin-bottom: 1rem; }
.search-results h4 { color: var(--accent); margin: 1.5rem 0 0.5rem; }
.search-results ul { list-style: none; padding: 0; margin: 0; }
.search-results li { padding: 0.75rem 0; border-bottom: 1px solid var(--border); }
.search-results .meta { font-size: 0.85rem; color: var(--muted); }

.industry-page img { border-radius: 6px; margin: 0.5rem 0; }
.industry-page .image-pair { display: flex; gap: 1rem; flex-wrap: wrap; }
.industry-page .image-pair img { flex: 1 1 45%; }
.industry-page .contact-header { display: flex; align-items: flex-start; gap: 1rem; padding: 1rem; background: #f7f9fc; border: 1px solid var(--border); border-radius: 8px; margin-bottom: 1.5rem; }
.industry-page .contact-avatar { width: 96px; height: 96px; object-fit: cover; border-radius: 50%; border: 2px solid var(--accent); flex-shrink: 0; }
.industry-page .contact-info h3 { margin: 0 0 0.5rem 0; color: var(--accent2); }
.industry-page .contact-info p { margin: 0; line-height: 1.7; }

@media (max-width: 600px) {
  .site-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
  .industry-page .contact-header { flex-direction: column; align-items: center; text-align: center; }
}