/* ==========================================================================
   Portfolio académique — styles principaux
   ========================================================================== */

:root {
  --navy-950: #061528;
  --navy-900: #071b33;
  --navy-800: #0b294c;
  --navy-700: #123c68;
  --blue-500: #2f72aa;
  --blue-300: #8db4d4;
  --ice: #e9f2f8;
  --paper: #f7f8fa;
  --white: #ffffff;
  --ink: #132237;
  --muted: #657387;
  --line: #dfe5eb;
  --sand: #c7ad82;
  --site-background: linear-gradient(115deg, #e8dcc9, #c8b18e);
  --success: #278265;
  --shadow-sm: 0 12px 35px rgba(7, 27, 51, .08);
  --shadow-lg: 0 30px 70px rgba(7, 27, 51, .16);
  --radius-sm: 12px;
  --radius-md: 20px;
  --radius-lg: 30px;
  --container: 1180px;
  --header-height: 84px;
  --transition: 280ms cubic-bezier(.2, .7, .2, 1);
}

*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: calc(var(--header-height) - 1px); }
body {
  margin: 0;
  color: var(--ink);
  background: var(--site-background);
  background-attachment: fixed;
  font-family: "Libre Franklin", sans-serif;
  font-size: 16px;
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}
body.menu-open, body.modal-open { overflow: hidden; }
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea { font: inherit; }
button { color: inherit; }
svg { width: 1.25rem; height: 1.25rem; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
h1, h2, h3, p { margin-top: 0; }
h1, h2, h3, .brand, .eyebrow, .btn, .filter-btn { font-family: "DM Sans", sans-serif; }
.container { width: min(calc(100% - 48px), var(--container)); margin-inline: auto; }
.section { padding: 118px 0; position: relative; overflow: hidden; }
.svg-sprite { width: 0; height: 0; position: absolute; overflow: hidden; }
.skip-link { position: fixed; top: -100px; left: 20px; z-index: 9999; padding: 12px 20px; background: var(--white); color: var(--navy-900); border-radius: 0 0 10px 10px; }
.skip-link:focus { top: 0; }

.eyebrow {
  display: flex;
  align-items: center;
  gap: 11px;
  margin-bottom: 24px;
  color: var(--navy-700);
  font-size: .73rem;
  font-weight: 700;
  letter-spacing: .15em;
  line-height: 1.3;
  text-transform: uppercase;
}
.eyebrow span { width: 30px; height: 1px; background: currentColor; }
.eyebrow.light { color: var(--blue-300); }
.section-heading { margin-bottom: 48px; }
.section-heading h2 {
  margin-bottom: 18px;
  color: var(--navy-900);
  font-size: clamp(2.25rem, 4.2vw, 4rem);
  font-weight: 500;
  letter-spacing: -.045em;
  line-height: 1.08;
}
.section-heading h2 em, .hero h1 em, .contact-copy h2 em { color: var(--blue-500); font-family: Georgia, serif; font-weight: 400; }
.section-heading > p { max-width: 610px; color: var(--muted); font-size: 1.05rem; }
.heading-split { display: grid; grid-template-columns: 1.2fr .8fr; align-items: end; gap: 80px; }
.heading-split > p { margin-bottom: 10px; }
.heading-inline { display: flex; justify-content: space-between; align-items: flex-end; gap: 40px; }
.heading-inline > div:first-child { flex-shrink: 0; }

/* Header */
.site-header {
  position: fixed;
  inset: 0 0 auto;
  z-index: 1000;
  height: var(--header-height);
  color: var(--navy-950);
  border-bottom: 1px solid rgba(7,27,51,.14);
  transition: background var(--transition), box-shadow var(--transition), color var(--transition), height var(--transition);
}
.site-header.scrolled { color: var(--navy-900); background: rgba(232,220,201,.96); box-shadow: 0 8px 30px rgba(7,27,51,.08); backdrop-filter: blur(16px); }
.header-inner { height: 100%; display: flex; align-items: center; gap: 30px; }
.brand { display: flex; align-items: center; gap: 12px; flex-shrink: 0; }
.header-logo-frame { width: 102px; height: 64px; display: block; position: relative; overflow: hidden; }
.header-logo { width: 134px; max-width: none; height: auto; position: absolute; top: -17px; left: 50%; mix-blend-mode: multiply; transform: translateX(-50%); }
.brand-mark {
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  color: var(--white);
  background: var(--blue-500);
  font-size: .88rem;
  font-weight: 700;
  letter-spacing: -.02em;
  border-radius: 50%;
}
.brand-copy { display: grid; line-height: 1.1; }
.brand-copy strong { font-size: .9rem; font-weight: 600; }
.brand-copy small { margin-top: 5px; opacity: .65; font-family: "Libre Franklin", sans-serif; font-size: .58rem; letter-spacing: .08em; text-transform: uppercase; }
.main-nav { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.main-nav a { position: relative; padding: 12px 0; font-family: "DM Sans", sans-serif; font-size: .79rem; font-weight: 500; }
.nav-admin-link { display: none; }
.main-nav a::after { content: ""; position: absolute; right: 0; bottom: 5px; left: 0; height: 1px; background: currentColor; transform: scaleX(0); transition: transform var(--transition); transform-origin: right; }
.main-nav a:hover::after, .main-nav a.active::after { transform: scaleX(1); transform-origin: left; }
.header-cta { display: flex; align-items: center; gap: 8px; padding: 10px 15px; margin-left: 4px; border: 1px solid rgba(7,27,51,.32); border-radius: 40px; font-family: "DM Sans", sans-serif; font-size: .74rem; font-weight: 600; white-space: nowrap; }
.site-header.scrolled .header-cta { border-color: var(--line); }
.header-cta svg { width: 15px; transition: transform var(--transition); }
.header-cta:hover svg { transform: translateX(3px); }
.menu-toggle { display: none; border: 0; background: transparent; cursor: pointer; }
.menu-toggle .close-icon { display: none; }

/* Hero */
.hero {
  min-height: 850px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  color: var(--navy-950);
  background: transparent;
}
.hero::before {
  content: "";
  position: absolute;
  inset: 0;
  opacity: .18;
  background-image: linear-gradient(rgba(78,52,24,.1) 1px, transparent 1px), linear-gradient(90deg, rgba(78,52,24,.1) 1px, transparent 1px);
  background-size: 80px 80px;
  mask-image: linear-gradient(to right, black, transparent 70%);
}
.hero-grid { display: block; padding-top: 100px; position: relative; z-index: 1; }
.hero-content { max-width: 940px; padding: 72px 0 56px; }
.hero h1 { margin: 0 0 28px; font-size: clamp(3.3rem, 6vw, 5.9rem); font-weight: 500; letter-spacing: -.06em; line-height: .98; }
.hero h1 em { color: #765736; }
.hero-intro { max-width: 650px; margin-bottom: 32px; color: rgba(7,27,51,.72); font-size: 1.02rem; line-height: 1.8; }
.hero-actions { display: flex; gap: 13px; flex-wrap: wrap; }
.btn { min-height: 52px; display: inline-flex; align-items: center; justify-content: center; gap: 12px; padding: 13px 22px; border: 0; border-radius: 40px; cursor: pointer; font-size: .8rem; font-weight: 600; transition: transform var(--transition), background var(--transition), color var(--transition), box-shadow var(--transition); }
.btn:hover { transform: translateY(-2px); }
.btn-primary { color: var(--white); background: var(--blue-500); box-shadow: 0 12px 28px rgba(31,94,148,.28); }
.btn-primary:hover { background: #3882bd; box-shadow: 0 15px 32px rgba(31,94,148,.35); }
.btn svg { width: 17px; transition: transform var(--transition); }
.btn:hover svg { transform: translateX(4px); }
.btn-ghost { color: var(--white); border: 1px solid var(--navy-900); background: var(--navy-900); }
.btn-ghost:hover { background: var(--navy-700); }
.hero-metrics { display: flex; gap: 34px; margin-top: 48px; padding-top: 30px; border-top: 1px solid rgba(7,27,51,.16); }
.hero-metrics div { display: grid; }
.hero-metrics strong { font-family: "DM Sans", sans-serif; font-size: 1.55rem; font-weight: 500; letter-spacing: -.04em; }
.hero-metrics span { color: rgba(7,27,51,.58); font-size: .7rem; }
.scroll-cue { position: absolute; z-index: 2; bottom: 27px; left: 50%; display: grid; justify-items: center; gap: 6px; color: rgba(7,27,51,.5); font-size: .61rem; letter-spacing: .12em; text-transform: uppercase; transform: translateX(-50%); }
.scroll-cue i { width: 1px; height: 24px; background: currentColor; animation: scrollLine 1.8s ease-in-out infinite; transform-origin: top; }
@keyframes scrollLine { 0%, 100% { transform: scaleY(.35); opacity: .5; } 50% { transform: scaleY(1); opacity: 1; } }

/* About */
.section-about { background: transparent; }
.about-layout { display: grid; grid-template-columns: 1fr 1.08fr; gap: 28px; }
.bio-card { min-height: 500px; display: flex; flex-direction: column; position: relative; padding: 46px; overflow: hidden; color: var(--white); background: var(--navy-900); border-radius: var(--radius-lg); }
.bio-card::after { content: ""; position: absolute; right: -100px; bottom: -100px; width: 300px; height: 300px; border: 1px solid rgba(255,255,255,.1); border-radius: 50%; box-shadow: 0 0 0 55px rgba(255,255,255,.025), 0 0 0 110px rgba(255,255,255,.02); }
.card-number { color: rgba(255,255,255,.28); font-size: .68rem; letter-spacing: .12em; }
.large-icon { width: 48px; height: 48px; margin: 55px 0 28px; color: var(--blue-300); }
.bio-lead { max-width: 470px; margin-bottom: 24px; font-family: "DM Sans", sans-serif; font-size: 1.4rem; line-height: 1.5; letter-spacing: -.02em; }
.bio-card > p:not(.bio-lead) { max-width: 470px; color: rgba(255,255,255,.6); font-size: .9rem; }
.signature { position: relative; z-index: 1; margin-top: auto; color: var(--blue-300); font-family: Georgia, serif; font-size: 1.35rem; font-style: italic; }
.about-cards { display: grid; gap: 20px; }
.info-card { display: grid; grid-template-columns: auto 1fr; gap: 22px; padding: 31px; background: var(--white); border: 1px solid var(--line); border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition); }
.info-card:hover { transform: translateY(-4px); box-shadow: var(--shadow-sm); border-color: transparent; }
.info-icon { width: 50px; height: 50px; display: grid; place-items: center; color: var(--blue-500); background: var(--ice); border-radius: 14px; }
.info-icon svg { width: 23px; height: 23px; }
.info-card span { color: var(--blue-500); font-size: .63rem; font-weight: 600; letter-spacing: .12em; text-transform: uppercase; }
.info-card h3 { margin: 5px 0 7px; font-size: 1.05rem; font-weight: 600; }
.info-card p { margin: 0; color: var(--muted); font-size: .83rem; line-height: 1.65; }

/* Filters */
.filter-row { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 36px; }
.filter-btn { padding: 9px 17px; color: rgba(255,255,255,.57); border: 1px solid rgba(255,255,255,.15); background: transparent; border-radius: 30px; cursor: pointer; font-size: .72rem; font-weight: 500; transition: var(--transition); }
.filter-btn:hover, .filter-btn.active { color: var(--navy-900); background: var(--white); border-color: var(--white); }
.filter-btn span { margin-left: 5px; opacity: .5; }
.filter-light .filter-btn { color: var(--muted); border-color: var(--line); }
.filter-light .filter-btn:hover, .filter-light .filter-btn.active { color: var(--white); background: var(--navy-900); border-color: var(--navy-900); }

/* Research */
.section-research { color: var(--ink); background: transparent; }
.section-research::before { content: ""; position: absolute; width: 700px; height: 700px; top: -300px; right: -250px; border: 1px solid rgba(78,52,24,.08); border-radius: 50%; box-shadow: 0 0 0 100px rgba(78,52,24,.018), 0 0 0 200px rgba(78,52,24,.012); }
.section-research .section-heading h2 { color: var(--navy-900); }
.section-research .section-heading h2 em { color: #765736; }
.section-research .section-heading > p { color: var(--muted); }
.section-research .filter-btn { color: var(--navy-700); border-color: rgba(7,27,51,.24); }
.section-research .filter-btn:hover, .section-research .filter-btn.active { color: var(--white); background: var(--navy-900); border-color: var(--navy-900); }
.research-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 20px; }
.research-card { min-height: 310px; display: flex; flex-direction: column; position: relative; padding: 31px; overflow: hidden; color: var(--white); border: 1px solid rgba(255,255,255,.12); background: var(--navy-950); border-radius: var(--radius-md); transition: transform var(--transition), background var(--transition), border-color var(--transition); }
.research-card:hover { transform: translateY(-5px); background: var(--navy-900); border-color: rgba(255,255,255,.25); }
.research-card::after { content: attr(data-index); position: absolute; right: 24px; bottom: -38px; color: rgba(255,255,255,.025); font-family: "DM Sans", sans-serif; font-size: 9rem; font-weight: 700; line-height: 1; }
.research-meta { display: flex; justify-content: space-between; align-items: center; }
.research-type { color: var(--blue-300); font-size: .62rem; letter-spacing: .12em; text-transform: uppercase; }
.research-icon { width: 45px; height: 45px; display: grid; place-items: center; color: var(--blue-300); border: 1px solid rgba(255,255,255,.13); border-radius: 50%; }
.research-card h3 { max-width: 490px; margin: 45px 0 12px; font-size: 1.3rem; font-weight: 500; line-height: 1.35; }
.research-card p { max-width: 520px; color: rgba(255,255,255,.52); font-size: .82rem; line-height: 1.7; }
.research-card .text-link { position: relative; z-index: 1; margin-top: auto; }
.text-link { display: inline-flex; align-items: center; gap: 10px; font-family: "DM Sans", sans-serif; font-size: .73rem; font-weight: 600; }
.text-link svg { width: 16px; transition: transform var(--transition); }
.text-link:hover svg { transform: translateX(4px); }
.data-empty { grid-column: 1 / -1; padding: 55px; text-align: center; color: var(--muted); border: 1px dashed var(--line); border-radius: var(--radius-md); }

/* Teaching */
.section-teaching { background: transparent; }
.course-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.course-card { display: flex; flex-direction: column; min-height: 280px; padding: 29px; border: 1px solid var(--line); border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition); }
.course-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-sm); border-color: transparent; }
.course-cover { height: 140px; margin: -29px -29px 20px; background-size: cover; background-position: center; border-radius: var(--radius-md) var(--radius-md) 0 0; }
.course-top { display: flex; justify-content: space-between; align-items: flex-start; }
.pdf-icon { width: 52px; height: 58px; display: grid; place-items: center; position: relative; color: var(--blue-500); background: var(--ice); border-radius: 7px 14px 7px 7px; }
.pdf-icon::before { content: "PDF"; position: absolute; bottom: 5px; font-family: "DM Sans", sans-serif; font-size: .52rem; font-weight: 700; letter-spacing: .05em; }
.pdf-icon svg { width: 23px; margin-top: -10px; }
.course-code { color: var(--muted); font-size: .61rem; letter-spacing: .09em; }
.course-card h3 { margin: 25px 0 8px; font-size: 1.05rem; font-weight: 600; line-height: 1.4; }
.course-card p { color: var(--muted); font-size: .78rem; line-height: 1.65; }
.course-card .download-btn { display: flex; align-items: center; justify-content: space-between; margin-top: auto; padding-top: 16px; color: var(--navy-700); border: 0; border-top: 1px solid var(--line); background: transparent; cursor: pointer; font-family: "DM Sans", sans-serif; font-size: .72rem; font-weight: 600; }
.download-btn svg { width: 17px; transition: transform var(--transition); }
.download-btn:hover svg { transform: translateY(3px); }
.teaching-note { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 20px; margin-top: 28px; padding: 25px 30px; background: var(--paper); border-radius: var(--radius-md); }
.note-icon { width: 45px; height: 45px; display: grid; place-items: center; color: var(--blue-500); background: var(--white); border-radius: 50%; }
.teaching-note strong { font-family: "DM Sans", sans-serif; font-size: .9rem; }
.teaching-note p { margin: 2px 0 0; color: var(--muted); font-size: .76rem; }
.teaching-note > a { display: flex; align-items: center; gap: 8px; color: var(--navy-700); font-family: "DM Sans", sans-serif; font-size: .72rem; font-weight: 600; }
.teaching-note > a svg { width: 16px; }

/* Videos */
.section-videos { background: transparent; }
.video-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 21px; }
.video-card { overflow: hidden; background: var(--white); border-radius: var(--radius-md); box-shadow: 0 5px 20px rgba(7,27,51,.04); transition: transform var(--transition), box-shadow var(--transition); }
.video-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-sm); }
.video-thumb { height: 210px; position: relative; overflow: hidden; background: var(--navy-800); background-size: cover; background-position: center; }
.video-thumb.has-image::before { display: none; }
.video-thumb::before, .news-image::before { content: ""; position: absolute; inset: 0; background-image: linear-gradient(125deg, rgba(255,255,255,.09), transparent 50%), radial-gradient(circle at 72% 30%, rgba(141,180,212,.65), transparent 30%), linear-gradient(145deg, #173e62, #08182b); }
.video-thumb.theme-lab::before { background-image: linear-gradient(135deg, rgba(255,255,255,.07), transparent), radial-gradient(circle at 30% 55%, #66a1c1 0 3%, transparent 3.5%), radial-gradient(circle at 52% 32%, #7cc1d6 0 2%, transparent 2.5%), repeating-linear-gradient(50deg, transparent 0 34px, rgba(255,255,255,.06) 35px 36px), linear-gradient(145deg, #0f3d50, #061528); }
.video-thumb.theme-class::before { background-image: linear-gradient(90deg, transparent 49%, rgba(255,255,255,.1) 50%, transparent 51%), linear-gradient(transparent 49%, rgba(255,255,255,.1) 50%, transparent 51%), linear-gradient(140deg,#406585,#0a2037); background-size: auto, 50px 50px, auto; }
.video-thumb.theme-talk::before { background-image: radial-gradient(ellipse at 50% 120%, #4e7192 0 35%, transparent 36%), radial-gradient(circle at 50% 38%, #89abc7 0 10%, transparent 10.5%), linear-gradient(145deg,#213f5e,#071728); }
.play-button { width: 58px; height: 58px; display: grid; place-items: center; position: absolute; top: 50%; left: 50%; color: var(--navy-900); border: 0; background: rgba(255,255,255,.93); border-radius: 50%; cursor: pointer; transform: translate(-50%,-50%); transition: transform var(--transition), background var(--transition); }
.play-button:hover { background: var(--white); transform: translate(-50%,-50%) scale(1.08); }
.play-button svg { width: 24px; height: 24px; margin-left: 2px; }
.video-duration { position: absolute; right: 12px; bottom: 12px; padding: 4px 8px; color: var(--white); background: rgba(0,0,0,.55); border-radius: 5px; font-size: .61rem; }
.video-body { padding: 23px; }
.video-category { color: var(--blue-500); font-size: .59rem; font-weight: 600; letter-spacing: .1em; text-transform: uppercase; }
.video-card h3 { margin: 8px 0 8px; font-size: 1rem; font-weight: 600; line-height: 1.4; }
.video-card p { min-height: 44px; margin: 0 0 16px; color: var(--muted); font-size: .73rem; line-height: 1.55; }
.watch-btn { padding: 0; color: var(--navy-700); border: 0; background: transparent; cursor: pointer; }

/* News */
.section-insights { background: transparent; }
.news-grid { display: grid; grid-template-columns: 1.25fr .75fr .75fr; gap: 20px; }
.news-card { overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-md); transition: transform var(--transition), box-shadow var(--transition), border-color var(--transition); }
.news-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-sm); border-color: transparent; }
.news-image { height: 190px; position: relative; overflow: hidden; }
.news-card.featured .news-image { height: 270px; }
.news-image::after { content: attr(data-symbol); position: absolute; right: 24px; bottom: -22px; color: rgba(255,255,255,.14); font-family: Georgia, serif; font-size: 8rem; line-height: 1; }
.news-image.theme-gold::before { background-image: radial-gradient(circle at 75% 25%, rgba(225,202,157,.85), transparent 25%), linear-gradient(145deg,#9a7c4f,#182a3d); }
.news-image.theme-blue::before { background-image: repeating-linear-gradient(120deg, transparent 0 25px, rgba(255,255,255,.06) 26px 27px), linear-gradient(145deg,#477fa5,#0b243d); }
.news-image.theme-stone::before { background-image: linear-gradient(35deg, transparent 45%, rgba(255,255,255,.13) 46% 48%, transparent 49%), linear-gradient(145deg,#718396,#152a3e); }
.news-body { padding: 24px; }
.news-meta { display: flex; justify-content: space-between; gap: 12px; color: var(--muted); font-size: .59rem; letter-spacing: .08em; text-transform: uppercase; }
.news-meta span:first-child { color: var(--blue-500); font-weight: 600; }
.news-card h3 { margin: 13px 0 9px; font-size: 1.05rem; font-weight: 600; line-height: 1.4; }
.news-card.featured h3 { font-size: 1.3rem; }
.news-card p { color: var(--muted); font-size: .74rem; line-height: 1.6; }
.news-card .text-link { color: var(--navy-700); }

/* Contact */
.section-contact { color: var(--ink); background: transparent; }
.section-contact::before { content: ""; position: absolute; right: -240px; bottom: -340px; width: 720px; height: 720px; border: 1px solid rgba(78,52,24,.08); border-radius: 50%; box-shadow: 0 0 0 100px rgba(78,52,24,.018), 0 0 0 200px rgba(78,52,24,.012); }
.contact-layout { display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; position: relative; z-index: 1; }
.contact-copy h2 { margin-bottom: 25px; font-family: "DM Sans", sans-serif; font-size: clamp(2.6rem, 4.7vw, 4.5rem); font-weight: 500; letter-spacing: -.05em; line-height: 1; }
.contact-copy h2 em { color: #765736; }
.contact-copy > p:not(.eyebrow) { max-width: 480px; color: var(--muted); font-size: .92rem; }
.section-contact .eyebrow.light { color: var(--navy-700); }
.contact-details { display: grid; gap: 17px; margin-top: 40px; }
.contact-details > * { display: flex; align-items: flex-start; gap: 16px; color: var(--ink); font-size: .79rem; }
.contact-details svg { width: 19px; height: 19px; flex: 0 0 19px; margin-top: 2px; color: var(--navy-700); }
.contact-details span { display: grid; }
.contact-details small { margin-bottom: 2px; color: rgba(7,27,51,.48); font-size: .56rem; letter-spacing: .1em; text-transform: uppercase; }
.academic-links { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 35px; }
.academic-links a { padding: 7px 12px; color: var(--navy-700); border: 1px solid rgba(7,27,51,.22); border-radius: 30px; font-family: "DM Sans", sans-serif; font-size: .64rem; transition: var(--transition); }
.academic-links a:hover { color: var(--white); background: var(--navy-900); }
.contact-form { padding: 38px; color: var(--ink); background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); }
.form-head { display: flex; justify-content: space-between; align-items: center; margin-bottom: 30px; padding-bottom: 20px; border-bottom: 1px solid var(--line); }
.form-head span { font-family: "DM Sans", sans-serif; font-size: 1.1rem; font-weight: 600; }
.form-head small { color: var(--muted); font-size: .63rem; }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 17px; }
.field { display: grid; gap: 7px; margin-bottom: 17px; }
.field label { font-family: "DM Sans", sans-serif; font-size: .68rem; font-weight: 600; }
.field input, .field textarea { width: 100%; padding: 13px 15px; color: var(--ink); border: 1px solid var(--line); outline: 0; background: var(--paper); border-radius: 9px; font-size: .76rem; resize: vertical; transition: border-color var(--transition), box-shadow var(--transition), background var(--transition); }
.field input:focus, .field textarea:focus { border-color: var(--blue-500); background: var(--white); box-shadow: 0 0 0 3px rgba(47,114,170,.1); }
.field input.invalid, .field textarea.invalid { border-color: #bd4b57; }
.contact-form .btn { width: 100%; margin-top: 3px; }
.form-status { min-height: 24px; margin: 12px 0 -10px; color: var(--success); font-size: .7rem; text-align: center; }

/* Footer */
.site-footer { padding: 64px 0 25px; color: rgba(7,27,51,.65); background: transparent; border-top: 1px solid rgba(7,27,51,.14); }
.footer-main { display: grid; grid-template-columns: 1fr 1fr 1fr; align-items: start; gap: 50px; padding-bottom: 48px; }
.footer-brand { color: var(--navy-900); }
.footer-main > p { max-width: 350px; font-size: .75rem; }
.footer-main nav { display: grid; grid-template-columns: repeat(2, auto); justify-content: end; gap: 10px 35px; font-family: "DM Sans", sans-serif; font-size: .7rem; }
.footer-main nav a:hover { color: var(--navy-900); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 20px; padding-top: 21px; border-top: 1px solid rgba(7,27,51,.14); font-size: .59rem; }
.footer-bottom a { display: flex; align-items: center; gap: 8px; color: var(--navy-900); }
.footer-bottom svg { width: 14px; }
.back-to-top { width: 43px; height: 43px; display: grid; place-items: center; position: fixed; right: 25px; bottom: 25px; z-index: 900; color: var(--white); border: 0; background: var(--blue-500); border-radius: 50%; box-shadow: var(--shadow-sm); cursor: pointer; opacity: 0; visibility: hidden; transform: translateY(12px); transition: var(--transition); }
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }

/* Modal */
.video-modal { position: fixed; inset: 0; z-index: 2000; display: grid; place-items: center; padding: 24px; }
.video-modal[hidden] { display: none !important; }
.modal-backdrop { position: absolute; inset: 0; background: rgba(4,14,27,.82); backdrop-filter: blur(8px); }
.modal-panel { width: min(100%, 620px); position: relative; z-index: 1; padding: 25px; background: var(--white); border-radius: var(--radius-md); box-shadow: var(--shadow-lg); }
.modal-close { width: 38px; height: 38px; display: grid; place-items: center; position: absolute; z-index: 2; top: 12px; right: 12px; color: var(--white); border: 1px solid rgba(255,255,255,.3); background: rgba(0,0,0,.3); border-radius: 50%; cursor: pointer; }
.modal-video { height: 320px; display: grid; place-items: center; align-content: center; gap: 15px; color: rgba(255,255,255,.65); background: linear-gradient(145deg, #244c70, var(--navy-950)); border-radius: 14px; font-size: .75rem; overflow: hidden; }
.modal-video svg { width: 55px; height: 55px; color: var(--white); }
.modal-video iframe { width: 100%; height: 100%; border: 0; border-radius: 14px; }
.video-fallback { display: grid; place-items: center; gap: 12px; text-align: center; padding: 25px; }
.video-fallback p { margin: 0; color: rgba(255,255,255,.78); }
.empty-state { grid-column: 1 / -1; padding: 30px; color: var(--muted); text-align: center; font-size: .85rem; }
.download-btn.is-downloading { pointer-events: none; opacity: .8; }
.spinner { display: inline-block; width: 13px; height: 13px; border: 2px solid rgba(0,0,0,.15); border-top-color: currentColor; border-radius: 50%; animation: spin .7s linear infinite; vertical-align: -2px; }
@keyframes spin { to { transform: rotate(360deg); } }
.modal-panel h3 { margin: 22px 0 8px; font-size: 1.25rem; }
.modal-panel p { margin-bottom: 0; color: var(--muted); font-size: .8rem; }

/* Reveal animations */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity 700ms ease, transform 700ms ease; }
.reveal.is-visible { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  .reveal { opacity: 1; transform: none; }
}

/* Responsive */
@media (max-width: 1100px) {
  :root { --header-height: 76px; }
  .main-nav { gap: 17px; }
  .main-nav a { font-size: .72rem; }
  .header-cta { display: none; }
}

@media (max-width: 900px) {
  .container { width: min(calc(100% - 36px), var(--container)); }
  .section { padding: 90px 0; }
  .site-header { height: var(--header-height); }
  .menu-toggle { width: 42px; height: 42px; display: grid; place-items: center; margin-left: auto; color: inherit; }
  .main-nav { display: flex; flex-direction: column; align-items: stretch; gap: 0; position: fixed; inset: var(--header-height) 0 auto; padding: 20px 18px 30px; color: var(--navy-900); background: #e8dcc9; border-top: 1px solid rgba(7,27,51,.14); box-shadow: 0 22px 35px rgba(7,27,51,.12); opacity: 0; visibility: hidden; transform: translateY(-12px); transition: var(--transition); }
  .main-nav.open { opacity: 1; visibility: visible; transform: translateY(0); }
  .main-nav a { padding: 14px 12px; font-size: .9rem; border-bottom: 1px solid var(--line); }
  .main-nav .nav-admin-link { display: block; color: var(--blue-500); font-weight: 700; }
  .main-nav a::after { display: none; }
  .menu-toggle[aria-expanded="true"] .menu-icon { display: none; }
  .menu-toggle[aria-expanded="true"] .close-icon { display: block; }
  .hero { min-height: auto; padding-bottom: 65px; }
  .hero-grid { display: block; }
  .hero h1 { font-size: clamp(3.2rem, 7.5vw, 4.5rem); }
  .scroll-cue { display: none; }
  .heading-split { gap: 30px; }
  .about-layout { grid-template-columns: 1fr; }
  .bio-card { min-height: 440px; }
  .course-grid, .video-grid { grid-template-columns: repeat(2, 1fr); }
  .news-grid { grid-template-columns: 1.2fr .8fr; }
  .news-card:last-child { grid-column: 1 / -1; display: grid; grid-template-columns: .8fr 1.2fr; }
  .news-card:last-child .news-image { height: 100%; min-height: 230px; }
  .contact-layout { grid-template-columns: 1fr; gap: 55px; }
}

@media (max-width: 680px) {
  .container { width: min(calc(100% - 28px), var(--container)); }
  .section { padding: 75px 0; }
  .brand-copy { display: none; }
  .header-logo-frame { width: 82px; height: 54px; }
  .header-logo { width: 110px; top: -14px; }
  .hero { padding-top: var(--header-height); }
  .hero-grid { display: block; padding-top: 22px; }
  .hero-content { padding: 35px 0 0; }
  .hero h1 { font-size: clamp(2.5rem, 9.5vw, 3.4rem); }
  .hero-intro { font-size: .9rem; }
  .hero-actions { display: flex; }
  .hero-metrics { gap: 18px; justify-content: space-between; }
  .hero-metrics strong { font-size: 1.35rem; }
  .hero-metrics span { font-size: .6rem; }
  .section-heading { margin-bottom: 35px; }
  .section-heading h2 { font-size: 2.55rem; }
  .heading-split, .heading-inline { display: block; }
  .heading-split > p { margin-top: 25px; }
  .heading-inline .filter-row { margin-top: 26px; }
  .bio-card { padding: 30px; }
  .large-icon { margin-top: 35px; }
  .bio-lead { font-size: 1.15rem; }
  .info-card { grid-template-columns: 1fr; padding: 25px; }
  .research-grid, .course-grid, .video-grid, .news-grid { grid-template-columns: 1fr; }
  .research-card { min-height: 290px; }
  .teaching-note { grid-template-columns: auto 1fr; }
  .teaching-note > a { grid-column: 2; }
  .news-card:last-child { grid-column: auto; display: block; }
  .news-card:last-child .news-image { min-height: 0; height: 190px; }
  .news-card.featured .news-image { height: 220px; }
  .contact-form { padding: 25px; }
  .form-row { grid-template-columns: 1fr; gap: 0; }
  .form-head { align-items: flex-start; gap: 8px; flex-direction: column; }
  .footer-main { grid-template-columns: 1fr; gap: 25px; }
  .footer-main nav { justify-content: start; }
  .footer-bottom { align-items: flex-start; flex-direction: column; }
  .modal-video { height: 220px; }
}

@media (max-width: 420px) {
  .hero-actions { grid-template-columns: 1fr; }
  .hero-metrics span { max-width: 85px; line-height: 1.35; }
  .filter-row { gap: 6px; }
  .filter-btn { padding: 8px 12px; font-size: .65rem; }
  .contact-form { padding: 20px; }
}