/* ============================================================
   STYLE.CSS: how the site looks
   Most things you'll want to change are in the first block (:root).
   Change a value there and it updates everywhere on the site.
   ============================================================ */

:root {
  /* ---- COLORS (edit the hex codes) ---- */
  --ink:      #0e2a3b;  /* dark ocean blue: headings, hero overlay */
  --text:     #23323c;  /* body text */
  --muted:    #5d6e79;  /* captions, small notes */
  --accent:   #1b6b7b;  /* teal: links, buttons, project edges */
  --accent-dark: #124c59; /* hover color for links/buttons */
  --glacier:  #eef4f6;  /* pale blue-grey background for alternate sections */
  --white:    #ffffff;

  /* ---- FONTS ---- */
  --font-head: 'Libre Baskerville', Georgia, serif;
  --font-body: 'DM Sans', system-ui, sans-serif;

  /* ---- HERO PHOTO: change the filename to use a different background photo ---- */
  --hero-photo: url('images/pic01.jpg');

  /* ---- LAYOUT ---- */
  --nav-height: 60px;
  --max-width: 1040px;   /* width of the main content */
  --narrow-width: 720px; /* width of text-only sections */
}

/* ---------- Basics ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav-height); }
body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.7;
  color: var(--text);
  background: var(--white);
}
img { max-width: 100%; display: block; }
a { color: var(--accent); text-underline-offset: 3px; }
a:hover { color: var(--accent-dark); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--accent); outline-offset: 3px; }

h1, h2, h3 { font-family: var(--font-head); color: var(--ink); font-weight: 400; line-height: 1.25; }
h2 { font-size: 2rem; margin: 0 0 1.2rem; }
h3 { font-size: 1.3rem; margin: 0 0 .6rem; }

/* ---------- Navigation bar ---------- */
.site-header {
  position: sticky; top: 0; z-index: 10;
  height: var(--nav-height);
  background: rgba(255,255,255,.95);
  border-bottom: 1px solid #d8e2e7;
}
.nav {
  max-width: var(--max-width); height: 100%;
  margin: 0 auto; padding: 0 1.25rem;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-name { font-family: var(--font-head); color: var(--ink); text-decoration: none; font-size: 1.05rem; }
.nav-links { display: flex; gap: 1.4rem; list-style: none; margin: 0; padding: 0; font-size: .95rem; }
.nav-links a { color: var(--text); text-decoration: none; padding: .3rem 0; border-bottom: 2px solid transparent; }
.nav-links a:hover, .nav-links a.active { color: var(--accent); border-bottom-color: var(--accent); }
/* The Title Matchmaker tab gets an outline so it reads as "a different page" */
.nav-links a.nav-game { border: 1.5px solid var(--accent); border-radius: 4px; padding: .25rem .7rem; color: var(--accent); }
.nav-links a.nav-game:hover { background: var(--accent); color: var(--white); }
.nav-toggle { display: none; } /* only shown on phones, see bottom of file */

/* ---------- Hero ---------- */
.hero {
  /* dark gradient over the photo keeps the white text readable on any photo */
  background:
    linear-gradient(100deg, rgba(14,42,59,.92) 20%, rgba(14,42,59,.45)),
    var(--hero-photo) center / cover no-repeat,
    var(--ink); /* fallback color if the photo is missing */
  color: var(--white);
  padding: 6rem 1.25rem 5rem;
  min-height: 70vh;
  display: flex; align-items: center;
}
.hero-inner { max-width: var(--max-width); width: 100%; margin: 0 auto; }
.hero h1 { color: var(--white); font-size: clamp(2.1rem, 5.5vw, 3.7rem); max-width: 16em; margin: 0 0 1.2rem; }
.hero-id { font-size: .95rem; opacity: .85; margin: 0 0 2.5rem; }
.hero-lead { font-size: 1.2rem; max-width: 36em; margin: 0 0 1.8rem; }
.hero-links { display: flex; flex-wrap: wrap; gap: .5rem 1.4rem; list-style: none; padding: 0; margin: 0; }
.hero-links a { color: var(--white); }

/* ---------- Sections ---------- */
.section { padding: 5rem 1.25rem; }
.section.tinted { background: var(--glacier); }   /* alternate background */
.wrap { max-width: var(--max-width); margin: 0 auto; }
.wrap.narrow { max-width: var(--narrow-width); }
.intro { max-width: 46em; font-size: 1.1rem; margin-bottom: 3.5rem; }

/* ---------- Research projects (photo + text, side by side) ---------- */
.project {
  display: grid; grid-template-columns: 5fr 7fr; gap: 2.5rem;
  align-items: center; margin-bottom: 3.5rem;
}
.project.flip { grid-template-columns: 7fr 5fr; }
.project.flip figure { order: 2; }               /* moves photo to the right */
.project figure { margin: 0; }
.project img { width: 100%; border-radius: 4px; }
figcaption { font-size: .85rem; color: var(--muted); margin-top: .5rem; }
.project.featured > div { border-left: 4px solid var(--accent); padding-left: 1.5rem; }
.funding { font-size: .92rem; color: var(--muted); }
.paper { font-size: .92rem; }

/* ---------- Photo gallery ---------- */
.gallery { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 1rem; }
.gallery figure { margin: 0; }
.gallery img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; border-radius: 4px; }

/* ---------- CV highlights grid (4 blocks; becomes 1 column on phones automatically) ---------- */
.cv-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 1rem 3rem; margin: 2.5rem 0 1.5rem; }
.cv-grid h3 { font-size: 1.1rem; }
.cv-grid ul { padding-left: 1.1rem; font-size: .95rem; margin: 0; }
.cv-grid li { margin-bottom: .5rem; }

/* ---------- Lists, buttons, about ---------- */
.pubs { padding-left: 1.2rem; }
.pubs li, .section li { margin-bottom: .9rem; }
.button {
  display: inline-block; background: var(--accent); color: var(--white);
  padding: .75rem 1.6rem; border-radius: 4px; text-decoration: none; font-weight: 500;
}
.button:hover { background: var(--accent-dark); color: var(--white); }
.about { display: grid; grid-template-columns: 220px 1fr; gap: 2.5rem; align-items: start; }
.portrait { width: 220px; aspect-ratio: 1; object-fit: cover; border-radius: 4px; }
.footer { background: var(--ink); color: #b9c8d1; text-align: center; padding: 2rem 1rem; font-size: .9rem; }
.footer p { margin: 0; }

/* ---------- Phones and small tablets ---------- */
@media (max-width: 820px) {
  .nav-toggle {
    display: block; background: none; border: 1.5px solid var(--accent); color: var(--accent);
    border-radius: 4px; padding: .35rem .9rem; font: inherit; cursor: pointer;
  }
  .nav-links {
    display: none; /* hidden until the Menu button is tapped (script.js adds "open") */
    position: absolute; top: var(--nav-height); left: 0; right: 0;
    flex-direction: column; gap: 0; background: var(--white);
    border-bottom: 1px solid #d8e2e7; padding: .5rem 1.25rem 1rem;
  }
  .nav-links.open { display: flex; }
  .nav-links a { display: block; padding: .6rem 0; }
  .nav-links a.nav-game { display: inline-block; margin-top: .5rem; }
  .project, .project.flip, .about { grid-template-columns: 1fr; gap: 1.2rem; }
  .project.flip figure { order: 0; }
  .section { padding: 3.5rem 1.25rem; }
}

/* Respect visitors who turn off animations in their system settings */
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }