@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;600;700;800&display=swap');

html {
  scroll-behavior: smooth;
}

:root {
  --color-primary: #d81f26;       /* HPI Red */
  --color-secondary: #012a4a;     /* HPI Dark Blue/Navy */
  --color-background: #ffffff;
  --color-text: #0b2545;
  --color-border: #e6eef6;
}

body {
    font-family: 'Inter', sans-serif;
    background-color: var(--color-background);
    color: var(--color-text);
    line-height: 1.7;
}

/* ── Section headers ── */
.section-header {
    border-bottom: 3px solid var(--color-primary);
    padding-bottom: 0.5rem;
    margin-bottom: 1.5rem;
    font-size: 2rem;
    font-weight: 800;
    color: var(--color-secondary);
}

/* ── Publication cards ── */
.publication-item {
  padding: 1rem;
  padding-right: 2.75rem;
  border-radius: 0.75rem;
  transition: all 0.3s ease;
  background-color: white;
  border: 1px solid var(--color-border);
  position: relative;
}
.publication-item:hover {
  box-shadow: 0 4px 15px rgba(216, 31, 38, 0.08);
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

/* ── Links ── */
.pro-link {
    color: var(--color-secondary);
    font-weight: 600;
    transition: color 0.2s;
}
.pro-link:hover {
    color: var(--color-primary);
    text-decoration: underline;
}

/* ── Layout helpers ── */
.flex-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}
.item {
    flex: 1;
    margin: 0 10px;
}
.auto-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 1.25rem;
}

/* ── Publication badges ── */
.pub-index {
    display: inline-block;
    background: var(--color-primary);
    color: white;
    padding: 0.12rem 0.5rem;
    border-radius: 999px;
    font-size: 0.75rem;
    font-weight: 700;
    line-height: 1;
    margin-left: 0.4rem;
}
.pub-number {
  position: absolute;
  top: 0.6rem;
  right: 0.6rem;
  background: var(--color-secondary);
  color: white;
  padding: 0.18rem 0.5rem;
  border-radius: 0.5rem;
  font-size: 0.75rem;
  font-weight: 700;
  line-height: 1;
}

/* ── Open Access badge ── */
.oa-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  background: #e6f4ea;
  color: #1a7f37;
  border: 1px solid #a8d5b5;
  padding: 0.1rem 0.45rem;
  border-radius: 999px;
  font-size: 0.7rem;
  font-weight: 700;
  text-decoration: none;
  vertical-align: middle;
  margin-left: 0.4rem;
  transition: background 0.2s;
}
.oa-badge:hover {
  background: #d0ecda;
  text-decoration: none;
}

/* ── Publication filter buttons ── */
.pub-filter-btn {
  padding: 0.4rem 0.9rem;
  border-radius: 999px;
  background: #f1f5f9;
  font-weight: 600;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all 0.2s;
}
.pub-filter-btn:hover {
  background: #e2e8f0;
}
.pub-filter-btn.active {
  background: var(--color-secondary);
  color: white;
  border-color: var(--color-secondary);
}

/* ── BibTeX copy button ── */
.bibtex-btn {
  margin-top: 0.5rem;
  padding: 0.4rem 0.8rem;
  font-size: 0.8rem;
  font-weight: bold;
  color: #2563eb;
  background: none;
  border: none;
  cursor: pointer;
  transition: color 0.2s;
}
.bibtex-btn:hover {
  color: var(--color-primary);
}

/* ── Profile icon buttons (sidebar) ── */
.profile-icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.5rem;
  border: 1px solid var(--color-border);
  background: #f8fafc;
  color: var(--color-secondary);
  text-decoration: none;
  transition: all 0.2s;
}
.profile-icon-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: #fff5f5;
  transform: translateY(-2px);
  box-shadow: 0 2px 8px rgba(216, 31, 38, 0.12);
  text-decoration: none;
}
.rg-btn {
  font-size: 0.7rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: #00adb5;
}
.rg-btn:hover {
  color: var(--color-primary);
}

/* ── External link icon on publication titles ── */
.pub-ext-link {
  display: inline-flex;
  align-items: center;
  color: var(--color-secondary);
  opacity: 0.5;
  margin-left: 0.35rem;
  vertical-align: middle;
  transition: opacity 0.2s;
  text-decoration: none;
}
.pub-ext-link:hover {
  opacity: 1;
  color: var(--color-primary);
}

/* ── Teaching table ── */
.teaching-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}
.teaching-table th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  background: var(--color-secondary);
  color: white;
  font-weight: 600;
}
.teaching-table td {
  padding: 0.45rem 0.75rem;
  border-bottom: 1px solid var(--color-border);
  vertical-align: top;
}
.teaching-table tr:last-child td {
  border-bottom: none;
}
.teaching-table tr:hover td {
  background: #f8fafc;
}