/* ============================================================
   Pr Ibra Dioum — Site personnel
   Design moderne, sombre/clair, responsive
   ============================================================ */

:root {
  --bg: #0a1424;
  --bg-alt: #0d1b30;
  --surface: #12233f;
  --surface-2: #16294a;
  --border: rgba(255, 255, 255, 0.08);
  --text: #eaf0f8;
  --text-dim: #9fb0c7;
  --primary: #38bdf8;
  --primary-2: #6366f1;
  --accent: #2dd4bf;
  --grad: linear-gradient(120deg, #38bdf8 0%, #6366f1 55%, #2dd4bf 100%);
  --shadow: 0 20px 50px -20px rgba(0, 0, 0, 0.6);
  --radius: 18px;
  --maxw: 1140px;
  --font: "Inter", system-ui, -apple-system, "Segoe UI", sans-serif;
  --display: "Sora", var(--font);
}

[data-theme="light"] {
  --bg: #f6f8fc;
  --bg-alt: #eef2f9;
  --surface: #ffffff;
  --surface-2: #f1f5fb;
  --border: rgba(13, 27, 48, 0.10);
  --text: #0d1b30;
  --text-dim: #51607a;
  --shadow: 0 20px 50px -22px rgba(20, 40, 80, 0.25);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; scroll-padding-top: 90px; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background .4s ease, color .4s ease;
}

h1, h2, h3, h4 { font-family: var(--display); line-height: 1.15; font-weight: 700; }
a { color: inherit; text-decoration: none; }
img, iframe { max-width: 100%; }
section { scroll-margin-top: 80px; }

/* ===== Scroll progress ===== */
.scroll-progress {
  position: fixed; top: 0; left: 0; height: 3px; width: 0%;
  background: var(--grad); z-index: 1000; transition: width .1s linear;
}

/* ===== Navigation ===== */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 900;
  background: color-mix(in srgb, var(--bg) 72%, transparent);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color .3s ease, background .3s ease, padding .3s ease;
}
.nav.scrolled { border-color: var(--border); }
.nav__inner {
  max-width: var(--maxw); margin: 0 auto; padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px;
}
.nav__brand { display: flex; align-items: center; gap: 12px; font-family: var(--display); font-weight: 700; }
.nav__logo {
  width: 38px; height: 38px; display: grid; place-items: center;
  border-radius: 11px; background: var(--grad); color: #fff;
  font-weight: 800; font-size: 15px; letter-spacing: .5px;
}
.nav__name { font-size: 1.05rem; }
.nav__links { display: flex; gap: 6px; }
.nav__links a {
  padding: 8px 14px; border-radius: 10px; font-size: .94rem; font-weight: 500;
  color: var(--text-dim); transition: color .2s, background .2s;
}
.nav__links a:hover, .nav__links a.active { color: var(--text); background: var(--surface-2); }
.nav__actions { display: flex; align-items: center; gap: 8px; }

.theme-toggle {
  width: 40px; height: 40px; border-radius: 11px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text); cursor: pointer;
  display: grid; place-items: center; transition: transform .2s, background .2s;
}
.theme-toggle:hover { transform: translateY(-2px); }
.icon-moon { display: none; }
[data-theme="light"] .icon-sun { display: none; }
[data-theme="light"] .icon-moon { display: block; }

.nav__burger { display: none; flex-direction: column; gap: 5px; width: 40px; height: 40px;
  border: 1px solid var(--border); background: var(--surface); border-radius: 11px; cursor: pointer; padding: 0; place-items: center; }
.nav__burger span { width: 18px; height: 2px; background: var(--text); border-radius: 2px; transition: .3s; }

/* ===== Buttons ===== */
.btn {
  display: inline-flex; align-items: center; gap: 8px; font-weight: 600;
  padding: 13px 24px; border-radius: 12px; font-size: .96rem; cursor: pointer;
  border: 1px solid transparent; transition: transform .2s, box-shadow .2s, background .2s;
}
.btn--sm { padding: 10px 18px; font-size: .9rem; }
.btn--primary { background: var(--grad); color: #fff; box-shadow: 0 10px 30px -10px var(--primary); }
.btn--primary:hover { transform: translateY(-3px); box-shadow: 0 16px 36px -12px var(--primary); }
.btn--ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn--ghost:hover { transform: translateY(-3px); background: var(--surface-2); }

/* ===== Hero ===== */
.hero { position: relative; padding: 150px 24px 70px; overflow: hidden; }
.hero__bg {
  position: absolute; inset: 0; z-index: 0;
  background:
    radial-gradient(50% 60% at 15% 10%, color-mix(in srgb, var(--primary) 22%, transparent), transparent 70%),
    radial-gradient(45% 55% at 90% 25%, color-mix(in srgb, var(--primary-2) 24%, transparent), transparent 70%),
    radial-gradient(40% 50% at 60% 100%, color-mix(in srgb, var(--accent) 16%, transparent), transparent 70%);
  pointer-events: none;
}
.hero__inner {
  position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto;
  display: grid; grid-template-columns: 1.4fr .9fr; gap: 50px; align-items: center;
}
.hero__eyebrow {
  display: inline-block; font-size: .82rem; font-weight: 600; letter-spacing: .5px;
  color: var(--primary); padding: 6px 14px; border: 1px solid var(--border);
  border-radius: 999px; background: var(--surface); margin-bottom: 22px;
}
.hero__title { font-size: clamp(2.6rem, 6vw, 4.4rem); font-weight: 800; letter-spacing: -1.5px; }
.hero__title span { background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.hero__role { font-size: clamp(1.05rem, 2.4vw, 1.3rem); color: var(--text); font-weight: 600; margin-top: 10px; }
.hero__lede { color: var(--text-dim); font-size: 1.05rem; margin-top: 18px; max-width: 540px; }
.hero__lede strong { color: var(--text); font-weight: 600; }
.hero__cta { display: flex; flex-wrap: wrap; gap: 14px; margin-top: 30px; }
.hero__social { display: flex; flex-wrap: wrap; gap: 18px; margin-top: 30px; }
.hero__social a { font-size: .9rem; font-weight: 500; color: var(--text-dim); position: relative; transition: color .2s; }
.hero__social a::after { content: ""; position: absolute; left: 0; bottom: -3px; width: 0; height: 2px; background: var(--grad); transition: width .25s; }
.hero__social a:hover { color: var(--text); }
.hero__social a:hover::after { width: 100%; }

.hero__card {
  background: var(--surface); border: 1px solid var(--border); border-radius: 24px;
  padding: 32px 28px; box-shadow: var(--shadow); text-align: center;
  position: relative; overflow: hidden;
}
.hero__card::before { content: ""; position: absolute; top: 0; left: 0; right: 0; height: 80px; background: var(--grad); opacity: .9; }
.hero__avatar {
  position: relative; width: 124px; height: 124px; border-radius: 50%; margin: 24px auto 14px;
  display: block; object-fit: cover; object-position: center top;
  background: var(--bg-alt); border: 4px solid var(--surface);
  box-shadow: 0 0 0 2px var(--primary);
}
.hero__cardtitle { font-family: var(--display); font-weight: 700; font-size: 1.2rem; }
.hero__cardsub { color: var(--text-dim); font-size: .9rem; margin-bottom: 18px; }
.hero__facts { list-style: none; text-align: left; display: grid; gap: 12px; }
.hero__facts li { font-size: .9rem; color: var(--text-dim); padding-left: 16px; position: relative; }
.hero__facts li::before { content: ""; position: absolute; left: 0; top: 9px; width: 7px; height: 7px; border-radius: 50%; background: var(--accent); }
.hero__facts span { display: block; color: var(--text); font-weight: 600; }

/* ===== Stats ===== */
.stats { padding: 0 24px; margin-top: -10px; }
.stats__inner {
  max-width: var(--maxw); margin: 0 auto; background: var(--surface);
  border: 1px solid var(--border); border-radius: var(--radius); box-shadow: var(--shadow);
  display: grid; grid-template-columns: repeat(4, 1fr); padding: 30px 20px;
}
.stat { text-align: center; padding: 8px; border-right: 1px solid var(--border); }
.stat:last-child { border-right: none; }
.stat__num { display: block; font-family: var(--display); font-weight: 800; font-size: 2.5rem;
  background: var(--grad); -webkit-background-clip: text; background-clip: text; -webkit-text-fill-color: transparent; }
.stat__label { color: var(--text-dim); font-size: .88rem; }

/* ===== Sections ===== */
.section { max-width: var(--maxw); margin: 0 auto; padding: 90px 24px; }
.section--alt { max-width: none; background: var(--bg-alt); }
.section--alt > * { max-width: var(--maxw); margin-left: auto; margin-right: auto; }
.section__head { margin-bottom: 48px; }
.section__tag {
  display: inline-block; font-size: .8rem; font-weight: 700; letter-spacing: 1.5px;
  text-transform: uppercase; color: var(--primary); margin-bottom: 12px;
}
.section__head h2 { font-size: clamp(1.9rem, 4vw, 2.7rem); letter-spacing: -1px; }
.section__intro { color: var(--text-dim); margin-top: 14px; max-width: 620px; font-size: 1.05rem; }

/* ===== À propos ===== */
.about { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: start; }
.about__bio p { color: var(--text-dim); margin-bottom: 16px; }
.about__bio strong { color: var(--text); }
.about__bio em { color: var(--primary); font-style: italic; }

.timeline { position: relative; padding-left: 8px; }
.tl { display: grid; grid-template-columns: 64px 1fr; gap: 18px; padding-bottom: 26px; position: relative; }
.tl::before { content: ""; position: absolute; left: 31px; top: 26px; bottom: -4px; width: 2px; background: var(--border); }
.tl:last-child { padding-bottom: 0; }
.tl:last-child::before { display: none; }
.tl__year {
  font-family: var(--display); font-weight: 700; font-size: .95rem; color: var(--primary);
  height: fit-content; padding: 7px 0; text-align: center; position: relative; z-index: 1;
  background: var(--surface); border: 1px solid var(--border); border-radius: 10px;
}
.tl__body h4 { font-size: 1.05rem; }
.tl__body p { color: var(--text-dim); font-size: .92rem; margin-top: 4px; }

/* ===== Cards ===== */
.cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.card {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px 24px; transition: transform .25s, border-color .25s, box-shadow .25s;
  position: relative; overflow: hidden;
}
.card::after { content: ""; position: absolute; inset: 0 0 auto 0; height: 3px; background: var(--grad); transform: scaleX(0); transform-origin: left; transition: transform .3s; }
.card:hover { transform: translateY(-6px); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); box-shadow: var(--shadow); }
.card:hover::after { transform: scaleX(1); }
.card__icon { font-size: 2rem; margin-bottom: 14px; }
.card h3 { font-size: 1.2rem; margin-bottom: 8px; }
.card p { color: var(--text-dim); font-size: .94rem; }
.card--mini { text-align: left; }
.card--mini h3 { font-size: 1.1rem; color: var(--primary); }
.card--mini p { margin-top: 6px; color: var(--text); }

/* ===== Publications ===== */
.pubs { display: grid; grid-template-columns: 1.1fr 1fr; gap: 30px; }
.pubs__venues, .pubs__profiles { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 30px; }
.pubs h3 { font-size: 1.15rem; margin-bottom: 18px; }
.pubs__venues ul { list-style: none; display: grid; gap: 12px; margin-bottom: 24px; }
.pubs__venues li { color: var(--text-dim); padding-left: 22px; position: relative; }
.pubs__venues li::before { content: "▹"; position: absolute; left: 0; color: var(--primary); }
.pubs__venues strong { color: var(--text); }
.profile-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.profile {
  display: flex; align-items: center; justify-content: center; text-align: center;
  padding: 16px 12px; border-radius: 12px; border: 1px solid var(--border);
  background: var(--surface-2); font-weight: 600; font-size: .92rem;
  transition: transform .2s, border-color .2s, color .2s;
}
.profile:hover { transform: translateY(-3px); border-color: var(--primary); color: var(--primary); }

/* ===== Enseignement ===== */
.teach { display: grid; grid-template-columns: 1fr 1fr; gap: 24px; }
.teach__item { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 32px 28px; }
.teach__item h3 { font-size: 1.25rem; margin-bottom: 18px; }
.teach__item ul { list-style: none; display: grid; gap: 14px; }
.teach__item li { color: var(--text-dim); padding-left: 26px; position: relative; }
.teach__item li::before { content: "✓"; position: absolute; left: 0; top: 0; color: var(--accent); font-weight: 700; }
.teach__item strong { color: var(--text); }

/* ===== Contact ===== */
.contact { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; align-items: stretch; }
.contact__info { display: grid; gap: 16px; align-content: start; }
.contact__row {
  display: flex; gap: 16px; align-items: flex-start; background: var(--surface);
  border: 1px solid var(--border); border-radius: 14px; padding: 20px 22px;
  transition: transform .2s, border-color .2s;
}
a.contact__row:hover { transform: translateX(4px); border-color: var(--primary); }
.contact__ico { font-size: 1.4rem; }
.contact__row strong { display: block; font-family: var(--display); margin-bottom: 4px; }
.contact__row span:last-child { color: var(--text-dim); font-size: .94rem; word-break: break-word; }
.contact__map { display: flex; flex-direction: column; border-radius: var(--radius); overflow: hidden; border: 1px solid var(--border); min-height: 320px; background: var(--surface); }
.contact__map iframe { width: 100%; flex: 1; min-height: 300px; border: 0; }
.contact__maplink { display: block; text-align: center; padding: 13px; font-size: .9rem; font-weight: 600; color: var(--primary); border-top: 1px solid var(--border); background: var(--surface); transition: background .2s; }
.contact__maplink:hover { background: var(--surface-2); }

/* ===== Footer ===== */
.footer { background: var(--bg-alt); border-top: 1px solid var(--border); padding: 50px 24px 30px; }
.footer__inner { max-width: var(--maxw); margin: 0 auto; display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 20px; }
.footer__name { font-family: var(--display); font-weight: 700; font-size: 1.2rem; }
.footer__sub { color: var(--text-dim); font-size: .9rem; }
.footer__links { display: flex; gap: 20px; flex-wrap: wrap; }
.footer__links a { color: var(--text-dim); font-size: .92rem; transition: color .2s; }
.footer__links a:hover { color: var(--primary); }
.footer__copy { max-width: var(--maxw); margin: 30px auto 0; padding-top: 22px; border-top: 1px solid var(--border); color: var(--text-dim); font-size: .85rem; text-align: center; }

/* ============================================================
   Pages intérieures (publications, projets, galerie, etc.)
   ============================================================ */
.page-hero { position: relative; padding: 140px 24px 60px; overflow: hidden; }
.page-hero::before {
  content: ""; position: absolute; inset: 0; z-index: 0; pointer-events: none;
  background:
    radial-gradient(50% 70% at 12% 0%, color-mix(in srgb, var(--primary) 20%, transparent), transparent 70%),
    radial-gradient(45% 60% at 95% 20%, color-mix(in srgb, var(--primary-2) 22%, transparent), transparent 70%);
}
.page-hero__inner { position: relative; z-index: 1; max-width: var(--maxw); margin: 0 auto; }
.breadcrumb { font-size: .85rem; color: var(--text-dim); margin-bottom: 14px; }
.breadcrumb a { color: var(--primary); }
.page-hero h1 { font-size: clamp(2.1rem, 5vw, 3.2rem); letter-spacing: -1px; }
.page-hero p { color: var(--text-dim); margin-top: 14px; max-width: 640px; font-size: 1.06rem; }

/* ---- Encadré "à compléter" / note ---- */
.note {
  display: flex; gap: 14px; align-items: flex-start; max-width: var(--maxw); margin: 0 auto 8px;
  background: color-mix(in srgb, var(--primary) 9%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--primary) 30%, var(--border));
  border-radius: 14px; padding: 16px 20px; color: var(--text-dim); font-size: .92rem;
}
.note strong { color: var(--text); }
.note__ico { font-size: 1.2rem; }

/* ---- Barre de filtres ---- */
.filter-bar { display: flex; flex-wrap: wrap; gap: 10px; margin-bottom: 30px; }
.filter-bar button {
  padding: 9px 18px; border-radius: 999px; border: 1px solid var(--border);
  background: var(--surface); color: var(--text-dim); font-weight: 600; font-size: .9rem;
  cursor: pointer; transition: all .2s;
}
.filter-bar button:hover { color: var(--text); }
.filter-bar button.active { background: var(--grad); color: #fff; border-color: transparent; }

/* ---- Liste de publications ---- */
.pub-list { display: grid; gap: 16px; }
.pub {
  display: grid; grid-template-columns: 70px 1fr; gap: 20px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px;
  padding: 22px 24px; transition: transform .2s, border-color .2s;
}
.pub:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.pub__year { font-family: var(--display); font-weight: 800; font-size: 1.15rem; color: var(--primary); }
.pub__title { font-size: 1.05rem; font-weight: 600; margin-bottom: 6px; }
.pub__meta { color: var(--text-dim); font-size: .92rem; font-style: italic; }
.pub__tags { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 12px; }
.tag {
  font-size: .76rem; font-weight: 600; padding: 4px 11px; border-radius: 999px;
  background: var(--surface-2); color: var(--text-dim); border: 1px solid var(--border);
}
.tag--journal { color: var(--accent); border-color: color-mix(in srgb, var(--accent) 40%, var(--border)); }
.tag--conf { color: var(--primary); border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); }
.pub__links { display: flex; gap: 14px; margin-top: 12px; }
.pub__links a { font-size: .85rem; font-weight: 600; color: var(--primary); }

/* ---- Projets ---- */
.projects { display: grid; gap: 20px; }
.project {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 28px; transition: transform .2s, border-color .2s;
}
.project:hover { transform: translateY(-4px); border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.project__top { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; flex-wrap: wrap; }
.project h3 { font-size: 1.25rem; }
.badge { font-size: .78rem; font-weight: 700; padding: 5px 13px; border-radius: 999px; white-space: nowrap; }
.badge--active { background: color-mix(in srgb, var(--accent) 18%, transparent); color: var(--accent); }
.badge--done { background: var(--surface-2); color: var(--text-dim); }
.project__role { color: var(--primary); font-weight: 600; font-size: .9rem; margin-top: 6px; }
.project p { color: var(--text-dim); margin-top: 12px; }
.project__foot { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 16px; }

/* ---- Encadrement : thèses ---- */
.thesis-list { display: grid; gap: 14px; margin-bottom: 50px; }
.thesis {
  display: grid; grid-template-columns: auto 1fr auto; gap: 18px; align-items: center;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 18px 22px;
}
.thesis__num { width: 38px; height: 38px; border-radius: 10px; display: grid; place-items: center;
  background: var(--surface-2); font-family: var(--display); font-weight: 700; color: var(--primary); }
.thesis__title { font-weight: 600; }
.thesis__sub { color: var(--text-dim); font-size: .9rem; margin-top: 2px; }
.thesis__year { color: var(--text-dim); font-weight: 600; font-size: .9rem; }

/* ---- Ressources pédagogiques ---- */
.resources { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.resource {
  display: flex; gap: 16px; align-items: flex-start; background: var(--surface);
  border: 1px solid var(--border); border-radius: 14px; padding: 22px; transition: border-color .2s, transform .2s;
}
.resource:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.resource__ico { font-size: 1.6rem; }
.resource h4 { font-size: 1.05rem; }
.resource p { color: var(--text-dim); font-size: .9rem; margin-top: 4px; }

/* ---- Galerie ---- */
.gallery { display: grid; grid-template-columns: repeat(3, 1fr); gap: 16px; }
.gallery figure {
  position: relative; margin: 0; border-radius: 14px; overflow: hidden; aspect-ratio: 4/3;
  border: 1px solid var(--border); background: var(--surface-2);
}
.gallery img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s; }
.gallery figure:hover img { transform: scale(1.06); }
.gallery figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; padding: 14px 16px 12px;
  background: linear-gradient(transparent, rgba(0,0,0,.75)); color: #fff; font-size: .85rem; font-weight: 500;
}
.gallery--empty {
  display: grid; place-items: center; aspect-ratio: auto; min-height: 200px; text-align: center;
  color: var(--text-dim); border-style: dashed; padding: 24px;
}

/* ---- Bandeau accès restreint ---- */
.access-banner {
  display: flex; gap: 16px; align-items: center; max-width: var(--maxw); margin: 0 auto 30px;
  background: color-mix(in srgb, var(--primary-2) 12%, var(--surface));
  border: 1px solid color-mix(in srgb, var(--primary-2) 35%, var(--border));
  border-radius: 14px; padding: 18px 22px;
}
.access-banner__ico { font-size: 1.6rem; }
.access-banner h3 { font-size: 1.05rem; margin-bottom: 2px; }
.access-banner p { color: var(--text-dim); font-size: .9rem; }

/* ---- Cours & documents ---- */
.course-list { display: grid; gap: 20px; }
.course {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 26px 28px;
}
.course__head { display: flex; align-items: center; justify-content: space-between; gap: 14px; flex-wrap: wrap; margin-bottom: 16px; }
.course__title { display: flex; align-items: center; gap: 12px; }
.course__title h3 { font-size: 1.25rem; }
.course__ico {
  width: 42px; height: 42px; border-radius: 11px; display: grid; place-items: center;
  background: var(--surface-2); font-size: 1.3rem; flex-shrink: 0;
}
.course__level { font-size: .78rem; font-weight: 700; padding: 5px 12px; border-radius: 999px;
  background: color-mix(in srgb, var(--accent) 16%, transparent); color: var(--accent); white-space: nowrap; }
.doc-list { display: grid; gap: 8px; }
.doc {
  display: flex; align-items: center; gap: 14px; padding: 12px 16px; border-radius: 11px;
  border: 1px solid var(--border); background: var(--surface-2); transition: border-color .2s, transform .2s;
}
.doc:hover { border-color: color-mix(in srgb, var(--primary) 40%, var(--border)); transform: translateX(4px); }
.doc__ico { font-size: 1.3rem; }
.doc__name { font-weight: 600; font-size: .95rem; }
.doc__meta { color: var(--text-dim); font-size: .82rem; }
.doc__dl { margin-left: auto; font-size: .85rem; font-weight: 600; color: var(--primary); white-space: nowrap; }

/* ---- Galerie dynamique + lightbox ---- */
.gallery-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 12px; }
.gallery-grid button {
  border: 0; padding: 0; margin: 0; cursor: pointer; border-radius: 12px; overflow: hidden;
  aspect-ratio: 1/1; background: var(--surface-2); position: relative; display: block;
}
.gallery-grid img { width: 100%; height: 100%; object-fit: cover; transition: transform .4s, opacity .3s; opacity: 0; }
.gallery-grid img.loaded { opacity: 1; }
.gallery-grid button:hover img { transform: scale(1.08); }
.gallery-grid button::after {
  content: "🔍"; position: absolute; inset: 0; display: grid; place-items: center;
  background: rgba(10,20,36,.45); color: #fff; font-size: 1.4rem; opacity: 0; transition: opacity .25s;
}
.gallery-grid button:hover::after { opacity: 1; }
.gallery-grid button.gal-hidden { display: none; }
.gallery-toggle { display: flex; margin: 26px auto 0; }

.lightbox {
  position: fixed; inset: 0; z-index: 2000; background: rgba(6,12,22,.94);
  display: none; align-items: center; justify-content: center; padding: 30px;
  opacity: 0; transition: opacity .25s;
}
.lightbox.open { display: flex; opacity: 1; }
.lightbox img { max-width: 92vw; max-height: 86vh; border-radius: 10px; box-shadow: 0 20px 60px rgba(0,0,0,.6); }
.lightbox__btn {
  position: absolute; top: 50%; transform: translateY(-50%); width: 54px; height: 54px;
  border-radius: 50%; border: 1px solid rgba(255,255,255,.25); background: rgba(255,255,255,.08);
  color: #fff; font-size: 1.6rem; cursor: pointer; display: grid; place-items: center; transition: background .2s;
}
.lightbox__btn:hover { background: rgba(255,255,255,.2); }
.lightbox__prev { left: 18px; }
.lightbox__next { right: 18px; }
.lightbox__close { top: 18px; right: 18px; transform: none; width: 46px; height: 46px; font-size: 1.3rem; }
.lightbox__counter { position: absolute; bottom: 20px; left: 0; right: 0; text-align: center; color: rgba(255,255,255,.8); font-size: .9rem; }

/* ---- Actualités ---- */
.news-list { display: grid; gap: 18px; }
.news {
  display: grid; grid-template-columns: 92px 1fr; gap: 22px;
  background: var(--surface); border: 1px solid var(--border); border-radius: 14px; padding: 22px 24px;
  transition: transform .2s, border-color .2s;
}
.news:hover { transform: translateY(-3px); border-color: color-mix(in srgb, var(--primary) 35%, var(--border)); }
.news__date {
  text-align: center; padding: 10px 0; border-radius: 12px; background: var(--surface-2); height: fit-content;
}
.news__day { font-family: var(--display); font-weight: 800; font-size: 1.4rem; display: block; color: var(--primary); }
.news__month { font-size: .78rem; text-transform: uppercase; letter-spacing: 1px; color: var(--text-dim); }
.news h3 { font-size: 1.15rem; }
.news p { color: var(--text-dim); margin-top: 6px; font-size: .94rem; }

/* ---- Opportunités ---- */
.opp-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; margin-bottom: 36px; }
.opp {
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px;
}
.opp h3 { font-size: 1.2rem; margin-bottom: 8px; }
.opp p { color: var(--text-dim); font-size: .95rem; }
.opp ul { list-style: none; margin-top: 14px; display: grid; gap: 10px; }
.opp li { color: var(--text-dim); padding-left: 22px; position: relative; font-size: .92rem; }
.opp li::before { content: "→"; position: absolute; left: 0; color: var(--primary); }
.callout {
  background: var(--grad); border-radius: var(--radius); padding: 36px; color: #fff; text-align: center;
}
.callout h3 { font-size: 1.5rem; color: #fff; }
.callout p { margin: 10px auto 22px; max-width: 560px; opacity: .95; }
.callout .btn { background: #fff; color: var(--bg); }

/* ===== Reveal animation ===== */
.reveal { opacity: 0; transform: translateY(28px); transition: opacity .7s ease, transform .7s ease; }
.reveal.in { opacity: 1; transform: none; }

/* ===== Responsive ===== */
@media (max-width: 900px) {
  .hero__inner { grid-template-columns: 1fr; gap: 36px; }
  .hero__card { max-width: 380px; }
  .stats__inner { grid-template-columns: 1fr 1fr; gap: 20px 0; }
  .stat:nth-child(2) { border-right: none; }
  .about, .pubs, .teach, .contact { grid-template-columns: 1fr; }
  .cards { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 1024px) {
  .nav__links {
    position: fixed; top: 68px; right: 16px; left: 16px; flex-direction: column;
    background: var(--surface); border: 1px solid var(--border); border-radius: 16px;
    padding: 12px; box-shadow: var(--shadow); transform: translateY(-12px); opacity: 0;
    pointer-events: none; transition: .25s; max-height: 80vh; overflow-y: auto;
  }
  .nav__links.open { transform: none; opacity: 1; pointer-events: auto; }
  .nav__burger { display: grid; }
  .nav__burger.open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
  .nav__burger.open span:nth-child(2) { opacity: 0; }
  .nav__burger.open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }
}
@media (max-width: 680px) {
  .cards { grid-template-columns: 1fr; }
  .hero { padding-top: 120px; }
  .section { padding: 64px 20px; }
}

@media (max-width: 900px) {
  .resources, .opp-grid, .gallery { grid-template-columns: 1fr 1fr; }
  .gallery-grid { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 680px) {
  .resources, .opp-grid, .gallery { grid-template-columns: 1fr; }
  .gallery-grid { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .lightbox__prev { left: 6px; } .lightbox__next { right: 6px; }
  .pub { grid-template-columns: 1fr; gap: 6px; }
  .pub__year { font-size: 1rem; }
  .thesis { grid-template-columns: auto 1fr; }
  .thesis__year { grid-column: 2; }
  .news { grid-template-columns: 64px 1fr; gap: 16px; }
  .page-hero { padding-top: 120px; }
}

@media (prefers-reduced-motion: reduce) {
  * { scroll-behavior: auto !important; }
  .reveal { opacity: 1; transform: none; transition: none; }
}