/* =========================================
   NSS Lab – Static Lab Website (Clean + Hover)
   - Top-right nav (no wrap)
   - Consistent container width
   - Section separators aligned to content width
   - Research panels with left accent bar (hover color)
   ========================================= */

:root {
  --maxw: 1040px;     /* 寬度加大：避免 nav 在常見桌機寬度換行 */
  --fg: #111;
  --muted: #666;
  --border: #e5e5e5;
  --dark-border: #bdbdbd;
  --bg: #fff;

  --panel: #f7f7f7;   /* research card background */
  --hover-panel: #f0f0f0;

  --link-hover: #0b57d0;  /* hover accent (可改成 NTU 藍) */
  --accent: #d0d0d0;      /* default left bar */
  --ntu-blue: #002b7f;
}

/* ===== Base ===== */

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.65;
}

a {
  color: var(--fg);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

/* ===== Container (controls page width) ===== */

.container {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header / Nav ===== */

.header {
  border-bottom: 1px solid var(--dark-border);
}

.header .container {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 20px;
  padding-top: 20px;
  padding-bottom: 12px;
  border-bottom: none;
}

.brand h1 {
  font-size: 1.25rem;
  color: var(--ntu-blue);
  margin: 0;
  font-weight: 700;
}

.brand .sub {
  font-size: 0.95rem;
  color: var(--link-hover);
  margin-top: 4px;
}

/* Top-right nav, no wrap */
.nav {
  display: flex;
  gap: 18px;
  flex-wrap: nowrap;
  white-space: nowrap;
  margin-left: auto;
}



/* Nav: simple text + hover color */
.nav a {
  border-radius: 0;
  border: none;
  background: transparent;
  padding: 6px 6px;
  color: var(--fg);
  font-size: 0.95rem;
  transition: color 0.2s ease;
}

.nav a:hover {
  color: var(--link-hover);
  text-decoration: none;
}

.nav a.active {
  background: transparent;
  border: none;
  color: var(--ntu-blue);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 6px;
}

/* ===== Main ===== */

main {
  padding: 30px 0 40px;
}

.page-title {
  font-size: 1.15rem;
  margin: 18px 0 14px;
  font-weight: 700;
}

.lead {
  color: var(--muted);
  margin-top: 6px;
}

/* ===== Section separators ===== */

.section {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px solid var(--border);
}

.section h2 {
  font-size: 0.95rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  margin: 0 0 10px;
}

/* ===== Lists ===== */

ul {
  margin: 10px 0 0;
  padding-left: 1.4rem;
}

li { margin: 0.25rem 0; }

/* ===== News style C: accent bar ===== */

.news-item-box {
  border-left: 4px solid var(--link-hover);
  padding-left: 12px;
  margin: 12px 0;
}

.news-date {
  font-weight: 700;
  margin-bottom: 4px;
}

/* ===== Research blocks: panel + left accent bar + hover ===== */

.research-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

/* Two-column layout on larger screens */
@media (min-width: 900px) {
  .research-grid {
    grid-template-columns: 1fr 1fr;
  }
}

.research-card {
  border-radius: 0;
  border: 1px solid var(--border);
  background: var(--panel);
  overflow: hidden;
  transition: background 0.2s ease, border-color 0.2s ease;
}

.research-card:hover {
  background: var(--hover-panel);
  border-color: var(--link-hover);
}

.research-card img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  display: block;
  border-radius: 1;
  background: #ddd; /* fallback if image missing */
}

.research-card .content {
  background: transparent;
  border-left: 6px solid var(--link-hover);
  padding: 14px 16px;
  transition: border-left-color 0.2s ease;
}

.research-card:hover .content {
  border-left-color: var(--link-hover);
}

.research-card h3 {
  margin: 0 0 6px;
  color: var(--link-hover);
  font-size: 1.05rem;
}

.research-card p {
  margin: 0;
  color: var(--muted);
}

/* =========================================
   Publications (grouped by year)
   - One year badge per group (top-right)
   - Each paper has a left thumbnail
   - PDF/DOI/Code are boxed buttons with hover/active tint
   ========================================= */

.pub-group {
  position: relative;
  padding-top: 0px;
  margin-top: 8px;
  border-top: 1px solid var(--border);
}

/* Year badge on top-right of the group */
.pub-year {
  position: absolute;
  top: 10px;
  right: 0;
  font-weight: 700;
  color: var(--fg);
  border-bottom: 2px solid var(--link-hover);
  padding-bottom: 2px;
  line-height: 1.1;
  background: var(--bg);
}

/* Each publication row */
.pub-item {
  display: grid;
  grid-template-columns: 110px 1fr;
  gap: 16px;
  align-items: start;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

/* last item in the group: no bottom border */
.pub-group .pub-item:last-child {
  border-bottom: none;
  padding-bottom: 4px;
}

.pub-thumb {
  width: 110px;
  height: 108px;
  margin-top: 8px;
  border: 1px solid var(--border);
  background: #f2f2f2;
  overflow: hidden;
}

.pub-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.pub-body {
  min-width: 0;
  padding-right: 70px; /* reserve space so text won’t collide with year badge */
}

.pub-title {
  font-weight: 700;
  margin: 0 0 0px;
}

.pub-meta {
  color: var(--muted);
  margin: 0 0 8px;
}

.pub-venue {
  /* font-weight: 600; */
  font-style: italic;
}

/* Boxed links (Kenworthy-style) */
.pub-links {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.pub-links a {
  display: inline-block;
  padding: 3px 10px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--fg);
  font-size: 0.92rem;
  line-height: 1.4;
  text-decoration: none;
  transition: background 0.15s ease, border-color 0.15s ease, color 0.15s ease;
}

.pub-links a:hover {
  background: #f3f6ff;
  border-color: #c7d2ff;
  color: var(--link-hover);
  text-decoration: none;
}

.pub-links a:active {
  background: #e9efff;
  border-color: #9fb4ff;
  color: var(--link-hover);
}

.pub-links a:focus-visible {
  outline: 2px solid rgba(11, 87, 208, 0.35);
  outline-offset: 2px;
}

.pub-full a {
  color: var(--link-hover);
}

/* Mobile: stack thumbnail on top, keep year badge */
@media (max-width: 560px) {
  .pub-item {
    grid-template-columns: 1fr;
  }
  .pub-thumb {
    width: 100%;
    height: 180px;
  }
  .pub-body {
    padding-right: 0;
  }
}

/* ===== Footer ===== */

footer {
  padding: 18px 0 26px;
  font-size: 0.9rem;
  color: var(--muted);
}

footer .container {
  border-top: 1px solid var(--dark-border);
  padding-top: 18px; 
}