/* ==========================================================
   Jack Blumenau – Personal Site
   Guardian-inspired: black & white, strong typography,
   single accent colour (deep red-orange).
   ========================================================== */

@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Source+Sans+3:ital,wght@0,300;0,400;0,600;0,700;1,400&display=swap');

:root {
  /* Palette: strictly monochrome + one accent */
  --black:   #121212;
  --dark:    #1a1a1a;
  --grey-90: #222;
  --grey-70: #4a4a4a;
  --grey-50: #767676;
  --grey-30: #b0b0b0;
  --grey-15: #dcdcdc;
  --grey-05: #f1f1f1;
  --white:   #ffffff;

  --accent:       #c70000;   /* Guardian red – the single pop */
  --accent-dark:  #a30000;
  --accent-light: rgba(199, 0, 0, 0.08);

  /* Typography */
  --display: "Playfair Display", Georgia, "Times New Roman", serif;
  --body:    "Source Sans 3", "Helvetica Neue", Arial, sans-serif;

  /* Layout */
  --max-width: 840px;
  --content-gap: 1.5rem;
}

/* ===== Reset & Base ===== */
*, *::before, *::after { box-sizing: border-box; }

html { font-size: 17px; scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--body);
  font-weight: 400;
  color: var(--black);
  background: var(--white);
  line-height: 1.72;
  -webkit-font-smoothing: antialiased;
}

::selection {
  background: var(--accent);
  color: var(--white);
}

/* ===== Typography ===== */
h1, h2, h3 { font-family: var(--display); line-height: 1.2; }

h1 {
  font-weight: 900;
  font-size: 2.6rem;
  letter-spacing: -0.02em;
  margin: 0;
}

h2 {
  font-weight: 700;
  font-size: 1.35rem;
  margin: 0;
  color: var(--black);
}

h3 {
  font-weight: 700;
  font-size: 1.1rem;
  margin: 0 0 0.2rem;
}

p { margin: 0 0 1rem; }

a {
  color: var(--accent);
  text-decoration: none;
  transition: color 0.15s;
}
a:hover {
  color: var(--accent-dark);
  text-decoration: underline;
}

strong { font-weight: 600; }
em { font-style: italic; }

/* ===== Layout ===== */
.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--content-gap);
}

/* ===== Top rule — Guardian signature ===== */
.top-rule {
  height: 4px;
  background: var(--accent);
  margin: 0;
  border: none;
}

/* ===== Navigation ===== */
nav {
  background: var(--white);
  border-bottom: 1px solid var(--black);
}

nav .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 52px;
}

nav .site-name {
  font-family: var(--display);
  font-weight: 900;
  font-size: 1.25rem;
  color: var(--black);
  text-decoration: none;
  letter-spacing: -0.01em;
}
nav .site-name:hover { color: var(--accent); text-decoration: none; }

nav ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.6rem;
}

nav ul li a {
  font-family: var(--body);
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--grey-70);
  text-decoration: none;
  padding: 0.15rem 0;
  border-bottom: 2px solid transparent;
  transition: color 0.15s, border-color 0.15s;
}

nav ul li a:hover {
  color: var(--black);
  border-bottom-color: var(--accent);
  text-decoration: none;
}

nav ul li a.active {
  color: var(--black);
  border-bottom-color: var(--accent);
}

/* ===== Hero (Home) ===== */
.hero {
  padding: 3rem 0 2.5rem;
  border-bottom: 1px solid var(--grey-15);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1fr 180px;
  gap: 2.5rem;
  align-items: start;
}

.hero h1 {
  margin-bottom: 0.1rem;
}

.hero .subtitle {
  font-family: var(--display);
  font-weight: 400;
  font-style: italic;
  font-size: 1.05rem;
  color: var(--grey-50);
  margin-bottom: 1.5rem;
  line-height: 1.5;
}

.hero .subtitle a { color: var(--grey-50); text-decoration: underline; }
.hero .subtitle a:hover { color: var(--accent); }

.hero .bio { color: var(--grey-70); font-size: 0.97rem; }
.hero .bio a { color: var(--accent); }

.hero img {
  width: 180px;
  filter: grayscale(100%) contrast(1.1);
  border-radius: 0;
}

.contact-bar {
  margin-top: 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid var(--grey-15);
  font-size: 0.87rem;
  color: var(--grey-50);
}

.contact-bar a { color: var(--accent); }

/* ===== Page header (subpages) ===== */
.page-header {
  padding: 2.2rem 0 1.2rem;
  border-bottom: 1px solid var(--grey-15);
}

.page-header h1 { margin-bottom: 0.15rem; }

.page-header .page-standfirst {
  font-family: var(--display);
  font-style: italic;
  font-size: 1rem;
  color: var(--grey-50);
  margin: 0;
}

/* ===== Section labels ===== */
.section-label {
  margin: 2.2rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--black);
  font-family: var(--body);
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--black);
}

/* ===== Publications ===== */
.pub {
  padding: 1.1rem 0;
  border-bottom: 1px solid var(--grey-15);
}

.pub:last-child { border-bottom: none; }

.pub-title {
  font-family: var(--display);
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0 0 0.2rem;
  line-height: 1.35;
  color: var(--black);
}

.pub-meta {
  font-size: 0.85rem;
  color: var(--grey-50);
  margin-bottom: 0.35rem;
}

.pub-links {
  margin-top: 0.35rem;
  display: flex;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.pub-links a {
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--accent);
  cursor: pointer;
  padding: 0.15rem 0;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s;
}

.pub-links a:hover {
  border-bottom-color: var(--accent);
  text-decoration: none;
}

.pub-abstract {
  display: none;
  margin-top: 0.8rem;
  padding: 1rem 0 0.5rem;
  border-top: 1px solid var(--grey-15);
  font-size: 0.9rem;
  line-height: 1.65;
  color: var(--grey-70);
  animation: fadeSlide 0.2s ease;
}

.pub-abstract.open { display: block; }

@keyframes fadeSlide {
  from { opacity: 0; transform: translateY(-3px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ===== Projects ===== */
.project {
  padding: 1.8rem 0;
  border-bottom: 1px solid var(--grey-15);
}

.project:last-child { border-bottom: none; }

.project-tags { margin-bottom: 0.4rem; }

.project-tag {
  display: inline-block;
  font-family: var(--body);
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.12rem 0.5rem;
  margin-right: 0.3rem;
  border: 1px solid;
}

.tag-research  { color: var(--black); border-color: var(--black); }
.tag-government { color: var(--accent); border-color: var(--accent); }
.tag-network   { color: var(--grey-70); border-color: var(--grey-70); }

.project h3 {
  font-family: var(--display);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--black);
  margin: 0.3rem 0 0.15rem;
}

.project .project-meta {
  font-size: 0.85rem;
  color: var(--grey-50);
  margin-bottom: 0.75rem;
}

.project p {
  font-size: 0.95rem;
  color: var(--grey-70);
}

.project p a { color: var(--accent); }

/* ===== Teaching ===== */
.course-group { margin-bottom: 1.5rem; }

.course {
  display: flex;
  align-items: baseline;
  gap: 1rem;
  padding: 0.65rem 0;
  border-bottom: 1px solid var(--grey-15);
}

.course:last-child { border-bottom: none; }

.course-code {
  font-family: var(--body);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--accent);
  min-width: 5.5rem;
  white-space: nowrap;
}

.course-code a { color: var(--accent); }
.course-code a:hover { text-decoration: underline; }

.course-title {
  font-size: 0.95rem;
  font-weight: 400;
  color: var(--black);
}

/* ===== Main content wrapper ===== */
.page-content {
  padding-bottom: 4rem;
}

/* ===== Footer ===== */
footer {
  border-top: 1px solid var(--black);
  padding: 1.2rem 0;
  font-size: 0.8rem;
  color: var(--grey-50);
}

footer .container {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

footer a { color: var(--grey-50); }
footer a:hover { color: var(--accent); }

/* ===== Responsive ===== */
@media (max-width: 640px) {
  html { font-size: 16px; }

  h1 { font-size: 2rem; }

  .hero-grid {
    grid-template-columns: 1fr;
  }

  .hero img {
    width: 140px;
    order: -1;
  }

  nav ul { gap: 1rem; }
  nav ul li a { font-size: 0.82rem; }

  .course { flex-direction: column; gap: 0.15rem; }
}