@import url('https://fonts.googleapis.com/css2?family=Libre+Baskerville:ital,wght@0,400;0,700;1,400&family=Lato:ital,wght@0,300;0,400;0,700;1,400&display=swap');

:root {
  --font-display: 'Libre Baskerville', Georgia, serif;
  --font-body: 'Lato', 'Segoe UI', sans-serif;
  /* Warm cream base — like the Cézanne cover paper */
  --color-bg: #f5f2ea;
  --color-text: #2b2b26;
  --color-text-light: #5e5c52;
  /* Sage green accent — the dominant watercolour wash */
  --color-accent: #5a8a5e;
  --color-accent-hover: #3e7043;
  --color-sage: #8aab8a;
  --color-sage-light: #c2d4be;
  /* Pale blue — the cooler strokes in the cover */
  --color-blue-hint: #8cb4c2;
  --color-blue-light: #d1e3ea;
  /* Warm cream for cards */
  --color-cream: #edeae2;
  --color-border: #d4cfc4;
  /* Dark type — like the crisp black title text */
  --color-nav-bg: #2b2b26;
  --color-nav-text: #e4e1d8;
  --color-card-bg: #faf8f4;
  --max-width: 1080px;
  --nav-height: 56px;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.72;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: '';
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: -1;
  background:
    radial-gradient(ellipse at 10% 15%, rgba(138,171,138,0.18) 0%, transparent 50%),
    radial-gradient(ellipse at 75% 8%, rgba(140,180,194,0.16) 0%, transparent 45%),
    radial-gradient(ellipse at 90% 60%, rgba(140,180,194,0.12) 0%, transparent 40%),
    radial-gradient(ellipse at 40% 85%, rgba(138,171,138,0.14) 0%, transparent 50%),
    radial-gradient(ellipse at 60% 40%, rgba(209,227,234,0.10) 0%, transparent 45%),
    radial-gradient(ellipse at 20% 65%, rgba(194,212,190,0.15) 0%, transparent 50%);
}

a { color: var(--color-accent); text-decoration: none; transition: color 0.2s; }
a:hover { color: var(--color-accent-hover); text-decoration: underline; }

/* NAV */
nav {
  position: sticky; top: 0; z-index: 100;
  background: var(--color-nav-bg);
  height: var(--nav-height);
  display: flex; align-items: center; justify-content: center;
  box-shadow: 0 1px 6px rgba(30,42,30,0.18);
}

/* Page-specific nav colours */
body[data-page="about"] nav { background: transparent; box-shadow: none; }
body[data-page="about"] nav .site-name {
  background: var(--color-nav-bg); color: #fff;
  padding: 6px 16px; border-radius: 4px;
}
body[data-page="about"] nav ul li > a { color: var(--color-text); }
body[data-page="about"] nav ul li > a:hover { background: rgba(30,42,30,0.08); color: var(--color-text); }
body[data-page="about"] nav ul li .dropdown { background: var(--color-nav-bg); }
body[data-page="about"] nav ul li .dropdown a { color: var(--color-nav-text); }
body[data-page="about"] .hamburger span { background: var(--color-text); }

body[data-page="research"] nav { background: #b8cfb0; box-shadow: 0 1px 6px rgba(30,42,30,0.10); }
body[data-page="research"] nav .site-name { color: #1e2a1e; }
body[data-page="research"] nav ul li > a { color: #2b3a2b; }
body[data-page="research"] nav ul li > a:hover { background: rgba(255,255,255,0.3); color: #1e2a1e; }
body[data-page="research"] nav ul li .dropdown { background: #b8cfb0; }
body[data-page="research"] nav ul li .dropdown a { color: #2b3a2b; }
body[data-page="research"] nav ul li .dropdown a:hover { background: rgba(255,255,255,0.25); }

body[data-page="community"] nav { background: #dbb8b0; box-shadow: 0 1px 6px rgba(60,30,30,0.10); }
body[data-page="community"] nav .site-name { color: #2b2020; }
body[data-page="community"] nav ul li > a { color: #3a2b2b; }
body[data-page="community"] nav ul li > a:hover { background: rgba(255,255,255,0.3); color: #2b2020; }
body[data-page="community"] nav ul li .dropdown { background: #dbb8b0; }
body[data-page="community"] nav ul li .dropdown a { color: #3a2b2b; }
body[data-page="community"] nav ul li .dropdown a:hover { background: rgba(255,255,255,0.25); }

body[data-page="explore"] nav { background: #a8c8d8; box-shadow: 0 1px 6px rgba(30,30,42,0.10); }
body[data-page="explore"] nav .site-name { color: #1e2630; }
body[data-page="explore"] nav ul li > a { color: #2b3540; }
body[data-page="explore"] nav ul li > a:hover { background: rgba(255,255,255,0.3); color: #1e2630; }
body[data-page="explore"] nav ul li .dropdown { background: #a8c8d8; }
body[data-page="explore"] nav ul li .dropdown a { color: #2b3540; }
body[data-page="explore"] nav ul li .dropdown a:hover { background: rgba(255,255,255,0.25); }
nav .nav-inner {
  width: 100%; max-width: var(--max-width);
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 24px;
}
nav .site-name {
  font-family: var(--font-display); font-size: 1.35rem; font-weight: 600;
  color: #fff; letter-spacing: 0.05em; text-decoration: none;
}
nav .site-name:hover { opacity: 0.85; text-decoration: none; color: #fff; }
nav ul { list-style: none; display: flex; gap: 2px; }
nav ul li { position: relative; }
nav ul li > a {
  display: block; padding: 8px 14px;
  color: var(--color-nav-text); font-size: 0.92rem; font-weight: 400;
  border-radius: 4px; transition: background 0.2s, color 0.2s; text-decoration: none;
}
nav ul li > a:hover { background: rgba(140,180,194,0.2); color: #fff; text-decoration: none; }
nav ul li .dropdown {
  display: none; position: absolute; top: 100%; left: 0;
  background: var(--color-nav-bg); min-width: 230px;
  border-radius: 0 0 6px 6px; box-shadow: 0 8px 24px rgba(30,42,30,0.22);
  padding: 6px 0; flex-direction: column;
}
nav ul li:hover .dropdown { display: flex; }
nav ul li .dropdown a { padding: 8px 18px; font-size: 0.88rem; color: var(--color-nav-text); border-radius: 0; }
nav ul li .dropdown a:hover { background: rgba(138,171,138,0.12); }
.hamburger { display: none; background: none; border: none; cursor: pointer; padding: 6px; }
.hamburger span { display: block; width: 22px; height: 2px; background: #fff; margin: 5px 0; border-radius: 2px; }

/* MAIN */
main {
  max-width: var(--max-width); margin: 0 auto;
  padding: 48px 24px 80px;
  animation: fadeUp 0.5s ease-out;
}
@keyframes fadeUp { from { opacity:0; transform:translateY(12px); } to { opacity:1; transform:translateY(0); } }

/* HOME */
.home-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; align-items: start; }
.home-photo img { width: 100%; border-radius: 6px; box-shadow: 0 4px 18px rgba(30,42,30,0.09); }
.home-photo .photo-caption { font-size: 0.82rem; color: var(--color-text-light); margin-top: 10px; line-height: 1.5; font-style: italic; }
.home-bio h1 { font-family: var(--font-display); font-size: 2.2rem; font-weight: 600; margin-bottom: 32px; line-height: 1.2; }
.home-bio p { margin-bottom: 14px; padding-left: 40px; }
.home-bio .contact-line { margin-top: 26px; padding-top: 18px; padding-left: 40px; border-top: 1px solid var(--color-blue-light); font-size: 0.95rem; }

/* PAGE HEADER */
.page-header { margin-bottom: 36px; padding-bottom: 14px; border-bottom: 2px solid var(--color-blue-light); }
.page-header h1 { font-family: var(--font-display); font-size: 2rem; font-weight: 600; }

/* SECTIONS */
.section-block { margin-bottom: 36px; }
.section-block h2 { font-family: var(--font-display); font-size: 1.45rem; font-weight: 600; margin-bottom: 12px; }
.section-block h3 { font-size: 1rem; font-weight: 600; margin-bottom: 6px; }
.section-block p, .section-block li { margin-bottom: 8px; }
.section-block ul { padding-left: 20px; }

.pub-item {
  margin-bottom: 18px; padding: 16px 20px;
  background: var(--color-card-bg);
  border-left: 3px solid var(--color-sage);
  border-radius: 0 6px 6px 0;
  box-shadow: 0 1px 5px rgba(30,42,30,0.05);
  transition: box-shadow 0.2s;
}
.pub-item:hover { box-shadow: 0 3px 12px rgba(30,42,30,0.09); }
.pub-item .pub-title { font-weight: 600; margin-bottom: 4px; }
.pub-item .pub-venue { font-style: italic; color: var(--color-text-light); font-size: 0.92rem; }
.pub-item .pub-links { margin-top: 6px; font-size: 0.88rem; }
.pub-item .pub-links a { margin-right: 12px; }

.course-card {
  margin-bottom: 16px; padding: 14px 20px;
  background: var(--color-card-bg); border-radius: 6px;
  border: 1px solid var(--color-border); transition: border-color 0.2s;
}
.course-card:hover { border-color: var(--color-blue-hint); }
.course-card .course-title { font-weight: 600; }
.course-card .course-meta { font-size: 0.9rem; color: var(--color-text-light); }

/* FOOTER */
footer {
  text-align: center; padding: 28px 24px;
  font-size: 0.84rem; color: var(--color-text-light);
  border-top: 1px solid var(--color-sage-light);
  max-width: var(--max-width); margin: 0 auto;
  background: linear-gradient(180deg, transparent, rgba(209,227,234,0.08));
}

/* RESPONSIVE */
@media (max-width: 700px) {
  .home-grid { grid-template-columns: 1fr; gap: 28px; }
  .home-photo { max-width: 220px; }
  nav ul {
    display: none; position: absolute; top: var(--nav-height); left: 0; right: 0;
    background: var(--color-nav-bg); flex-direction: column; padding: 12px 0;
    box-shadow: 0 8px 24px rgba(30,42,30,0.22);
  }
  nav ul.open { display: flex; }
  nav ul li .dropdown { position: static; box-shadow: none; padding-left: 18px; }
  .hamburger { display: block; }
}