/* =====================================================================
   Chaire Architecture & Intelligences — ENSA Paris-Val de Seine
   Editorial / architectural design system. Buildless.
   Tune the brand by editing the variables in :root below.
   ===================================================================== */

:root {
  /* Palette — change --accent to re-theme the whole site */
  --bg:        #f4f2ed;   /* paper */
  --bg-alt:    #eae7df;   /* sectioned background */
  --ink:       #15120f;   /* near-black text */
  --muted:     #6c655c;   /* secondary text */
  --line:      #d8d3c8;   /* hairlines */
  --accent:    #16b3ab;   /* teal — the chair's identity colour */
  --accent-text:#0a7d76;  /* deeper teal for small text on light bg (a11y) */
  --accent-ink:#ffffff;
  --card:      #ffffff;

  /* Type */
  --font-display: "Space Grotesk", "Helvetica Neue", Arial, sans-serif;
  --font-body:    "Inter", "Helvetica Neue", Arial, sans-serif;

  /* Layout */
  --maxw: 1240px;
  --gutter: clamp(1.25rem, 4vw, 4rem);
  --header-h: 76px;
  --radius: 4px;
}

/* ------------------------------------------------------------------ Reset */
*, *::before, *::after { box-sizing: border-box; }
* { margin: 0; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body {
  font-family: var(--font-body);
  background: var(--bg);
  color: var(--ink);
  line-height: 1.6;
  font-size: 17px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
ul { list-style: none; padding: 0; }

/* ----------------------------------------------------------- Typography */
h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 600; line-height: 1.08; letter-spacing: -0.01em; }
.display {
  font-size: clamp(2.4rem, 6vw, 5rem);
  font-weight: 600;
  line-height: 0.98;
  letter-spacing: -0.02em;
}
.eyebrow {
  font-family: var(--font-display);
  font-size: 0.78rem;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent-text);
}
.lead { font-size: clamp(1.1rem, 1.6vw, 1.32rem); color: var(--muted); line-height: 1.5; }
.muted { color: var(--muted); }

/* --------------------------------------------------------------- Layout */
.wrap { max-width: var(--maxw); margin-inline: auto; padding-inline: var(--gutter); }
section { padding-block: clamp(3.5rem, 8vw, 7rem); }
.section-alt { background: var(--bg-alt); }
.grid { display: grid; gap: clamp(1.25rem, 2.5vw, 2rem); }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
@media (max-width: 900px) { .cols-3, .cols-4 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 600px) { .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; } }

.section-head { max-width: 60ch; margin-bottom: clamp(2rem, 4vw, 3.5rem); }
.section-head h2 { font-size: clamp(1.8rem, 3.5vw, 2.8rem); margin-top: 0.6rem; }
.section-head p { margin-top: 1rem; }

/* --------------------------------------------------------------- Buttons */
.btn {
  display: inline-flex; align-items: center; gap: 0.6em;
  padding: 0.85em 1.5em;
  font-family: var(--font-display); font-weight: 500; font-size: 0.95rem;
  border: 1px solid var(--ink);
  border-radius: var(--radius);
  background: var(--ink); color: var(--bg);
  transition: transform .15s ease, background .2s ease, color .2s ease;
}
.btn:hover { transform: translateY(-2px); background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.btn--ghost { background: transparent; color: var(--ink); }
.btn--ghost:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn--accent { background: var(--accent); border-color: var(--accent); color: var(--accent-ink); }
.arrow::after { content: "→"; transition: transform .2s ease; }
.btn:hover .arrow::after, a:hover > .arrow::after { transform: translateX(3px); }

/* ---------------------------------------------------------------- Header */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.site-header__inner {
  height: var(--header-h);
  display: flex; align-items: center; justify-content: space-between; gap: 1.5rem;
}
.brand { display: flex; align-items: center; gap: 0.7rem; flex-shrink: 0; }
.brand__logo { height: 26px; width: auto; }
.brand__sep { width: 1px; height: 30px; background: var(--line); }
.brand__text { font-family: var(--font-display); font-weight: 600; line-height: 1.1; font-size: 0.9rem; }
.brand__text small { display: block; font-weight: 400; font-size: 0.68rem; letter-spacing: 0.02em; color: var(--muted); }
.site-footer .brand__sep { background: color-mix(in srgb, var(--bg) 25%, transparent); }
.site-footer .brand__text small { color: color-mix(in srgb, var(--bg) 55%, transparent); }

.nav { display: flex; align-items: center; gap: 1.6rem; }
.nav a {
  font-family: var(--font-display); font-size: 0.92rem; font-weight: 500;
  padding: 0.4rem 0; position: relative; color: var(--ink);
}
.nav a::after {
  content: ""; position: absolute; left: 0; bottom: -2px; height: 2px; width: 0;
  background: var(--accent); transition: width .2s ease;
}
.nav a:hover::after, .nav a[aria-current="page"]::after { width: 100%; }
.nav a[aria-current="page"] { color: var(--accent-text); }

.header-tools { display: flex; align-items: center; gap: 0.75rem; }
.lang-toggle {
  display: inline-flex; border: 1px solid var(--line); border-radius: 999px; overflow: hidden;
  font-family: var(--font-display); font-size: 0.78rem; font-weight: 600;
}
.lang-toggle button { padding: 0.35rem 0.7rem; background: transparent; color: var(--muted); border: 0; letter-spacing: 0.05em; }
.lang-toggle button[aria-pressed="true"] { background: var(--ink); color: var(--bg); }

.burger { display: none; width: 40px; height: 40px; border: 1px solid var(--line); border-radius: var(--radius); background: transparent; position: relative; }
.burger span, .burger span::before, .burger span::after {
  content: ""; position: absolute; left: 50%; top: 50%; width: 18px; height: 2px; background: var(--ink);
  transform: translate(-50%, -50%); transition: transform .25s ease, opacity .2s ease;
}
.burger span::before { top: -6px; } .burger span::after { top: 6px; }
.burger span::before, .burger span::after { left: 0; transform: none; }
body.nav-open .burger span { background: transparent; }
body.nav-open .burger span::before { transform: rotate(45deg) translate(0, 6px); }
body.nav-open .burger span::after  { transform: rotate(-45deg) translate(0, -6px); }

@media (max-width: 920px) {
  .burger { display: block; }
  .nav {
    position: fixed; inset: var(--header-h) 0 auto 0;
    flex-direction: column; align-items: flex-start; gap: 0;
    background: var(--bg); border-bottom: 1px solid var(--line);
    padding: 1rem var(--gutter) 2rem;
    transform: translateY(-120%); transition: transform .3s ease; max-height: calc(100vh - var(--header-h)); overflow:auto;
  }
  body.nav-open .nav { transform: translateY(0); }
  .nav a { width: 100%; padding: 0.9rem 0; border-bottom: 1px solid var(--line); font-size: 1.1rem; }
}

/* ------------------------------------------------------------------ Hero */
.hero { position: relative; overflow: hidden; padding-block: clamp(3rem, 7vw, 6rem); }
.hero__grid { display: grid; grid-template-columns: 1.15fr 0.85fr; gap: clamp(2rem, 5vw, 4rem); align-items: center; }
@media (max-width: 880px) { .hero__grid { grid-template-columns: 1fr; } }
.hero h1 { margin: 1.2rem 0; }
.hero .lead { max-width: 46ch; }
.hero__actions { display: flex; gap: 0.9rem; flex-wrap: wrap; margin-top: 2rem; }
.hero__art {
  aspect-ratio: 4/5; border-radius: var(--radius); overflow: hidden;
  background: var(--ink); position: relative; box-shadow: 0 30px 60px -30px rgba(0,0,0,.4);
}

/* Abstract generative-architecture placeholder art */
.art-grid { position: absolute; inset: 0; background:
  radial-gradient(120% 120% at 80% 10%, color-mix(in srgb, var(--accent) 65%, transparent), transparent 55%),
  repeating-linear-gradient(0deg, rgba(255,255,255,.07) 0 1px, transparent 1px 38px),
  repeating-linear-gradient(90deg, rgba(255,255,255,.07) 0 1px, transparent 1px 38px),
  linear-gradient(160deg, #1c1814, #15120f);
}
.art-grid::after {
  content: ""; position: absolute; inset: 0;
  background:
    conic-gradient(from 200deg at 30% 70%, color-mix(in srgb, var(--accent) 50%, transparent), transparent 40%);
  mix-blend-mode: screen; opacity: .8;
}
.art-tag { position: absolute; left: 1rem; bottom: 1rem; color: #fff; font-family: var(--font-display); font-size: .72rem; letter-spacing: .15em; opacity: .7; text-transform: uppercase; }

/* ------------------------------------------------------------------ Cards */
.card {
  background: var(--card); border: 1px solid var(--line); border-radius: var(--radius);
  padding: clamp(1.4rem, 2.5vw, 2rem); display: flex; flex-direction: column; gap: 0.75rem;
  transition: transform .18s ease, box-shadow .18s ease, border-color .18s ease;
}
.card.link-card:hover { transform: translateY(-4px); box-shadow: 0 22px 40px -28px rgba(0,0,0,.35); border-color: var(--accent); }
.card__num { font-family: var(--font-display); font-size: 0.8rem; color: var(--accent); letter-spacing: .1em; }
.card h3 { font-size: 1.3rem; }
.card p { color: var(--muted); font-size: 0.98rem; }
.card__more { margin-top: auto; font-family: var(--font-display); font-weight: 500; font-size: 0.9rem; color: var(--accent-text); }

/* Axis card with index number, architectural feel */
.axis { position: relative; overflow: hidden; }
.axis .card__num { font-size: 2.4rem; font-weight: 500; line-height: 1; opacity: .25; color: var(--ink); }

/* ----------------------------------------------------------- Agenda / news */
.agenda-item {
  display: grid; grid-template-columns: auto 1fr auto; gap: 1.5rem; align-items: center;
  padding: 1.4rem 0; border-bottom: 1px solid var(--line);
}
.agenda-item:first-child { border-top: 1px solid var(--line); }
.agenda-date { font-family: var(--font-display); text-align: center; min-width: 64px; }
.agenda-date .d { font-size: 1.7rem; font-weight: 600; line-height: 1; }
.agenda-date .m { font-size: 0.75rem; letter-spacing: .15em; text-transform: uppercase; color: var(--accent-text); }
.agenda-body h3 { font-size: 1.15rem; }
.agenda-body p { color: var(--muted); font-size: 0.95rem; }
.tag {
  display: inline-block; font-family: var(--font-display); font-size: 0.68rem; font-weight: 600;
  letter-spacing: 0.12em; text-transform: uppercase; padding: 0.3em 0.7em;
  border: 1px solid var(--line); border-radius: 999px; color: var(--muted);
}
.tag--accent { color: var(--accent-text); border-color: color-mix(in srgb, var(--accent) 40%, var(--line)); }
@media (max-width: 640px){ .agenda-item { grid-template-columns: auto 1fr; } .agenda-item .tag { display:none; } }

/* ------------------------------------------------------------ News filters */
.filterbar { display: flex; flex-wrap: wrap; gap: 0.6rem; margin-bottom: 2.5rem; }
.filterbar button {
  font-family: var(--font-display); font-size: 0.85rem; font-weight: 500;
  padding: 0.5em 1.1em; border: 1px solid var(--line); border-radius: 999px;
  background: transparent; color: var(--ink); transition: all .15s ease;
}
.filterbar button[aria-pressed="true"] { background: var(--ink); color: var(--bg); border-color: var(--ink); }

.news-card { overflow: hidden; padding: 0; }
.news-card__media { aspect-ratio: 16/10; background: var(--bg-alt) var(--art-grad); }
.news-card__body { padding: 1.4rem 1.5rem 1.6rem; display: flex; flex-direction: column; gap: .6rem; }
.news-card__meta { display: flex; gap: .8rem; align-items: center; font-size: .8rem; color: var(--muted); font-family: var(--font-display); }

/* media placeholder gradients (cycled) */
.ph { background: linear-gradient(150deg, #1c1814, #15120f); position: relative; }
.ph::after { content:""; position:absolute; inset:0; background: radial-gradient(100% 100% at 75% 15%, color-mix(in srgb,var(--accent) 55%, transparent), transparent 55%), repeating-linear-gradient(90deg, rgba(255,255,255,.06) 0 1px, transparent 1px 30px); }
.ph-2::after { background: radial-gradient(100% 100% at 20% 80%, color-mix(in srgb,#3f6f8f 60%, transparent), transparent 55%), repeating-linear-gradient(0deg, rgba(255,255,255,.06) 0 1px, transparent 1px 30px); }
.ph-3::after { background: conic-gradient(from 120deg at 60% 40%, color-mix(in srgb,var(--accent) 40%, transparent), transparent 45%), repeating-linear-gradient(45deg, rgba(255,255,255,.05) 0 1px, transparent 1px 22px); }

/* ----------------------------------------------------------- Page header */
.page-hero { padding-block: clamp(2.5rem, 6vw, 4.5rem) clamp(2rem, 4vw, 3rem); border-bottom: 1px solid var(--line); }
.page-hero h1 { font-size: clamp(2.2rem, 5vw, 3.8rem); margin: .8rem 0 1rem; }
.page-hero .lead { max-width: 60ch; }
.breadcrumb { font-family: var(--font-display); font-size: .8rem; color: var(--muted); letter-spacing: .03em; }
.breadcrumb a:hover { color: var(--accent-text); }

/* ---------------------------------------------------------------- Members */
.member { text-align: left; }
.member__avatar { aspect-ratio: 1; border-radius: var(--radius); margin-bottom: .9rem; }
.member h3 { font-size: 1.05rem; }
.member p { font-size: .9rem; color: var(--muted); }
.member .role { color: var(--accent-text); font-family: var(--font-display); font-size: .8rem; letter-spacing: .04em; text-transform: uppercase; }

/* --------------------------------------------------------------- Committee */
.committee { border-left: 3px solid var(--accent); padding-left: 1.4rem; }
.committee h3 { font-size: 1.4rem; margin-bottom: .4rem; }

/* ------------------------------------------------------------- Definition list / resources */
.res-row {
  display: grid; grid-template-columns: 1fr auto; gap: 1rem; align-items: center;
  padding: 1.2rem 0; border-bottom: 1px solid var(--line);
}
.res-row:first-child { border-top: 1px solid var(--line); }
.res-row h3 { font-size: 1.1rem; }
.res-row .meta { color: var(--muted); font-size: .9rem; }

/* ----------------------------------------------------------------- Forms */
.form-grid { display: grid; gap: 1.1rem; }
.field { display: flex; flex-direction: column; gap: .4rem; }
.field label { font-family: var(--font-display); font-size: .85rem; font-weight: 500; }
.field input, .field textarea, .field select {
  font: inherit; padding: .8em 1em; border: 1px solid var(--line); border-radius: var(--radius);
  background: var(--card); color: var(--ink); width: 100%;
}
.field input:focus, .field textarea:focus, .field select:focus { outline: 2px solid var(--accent); outline-offset: 1px; border-color: var(--accent); }
.form-note { font-size: .82rem; color: var(--muted); }

.contact-grid { display: grid; grid-template-columns: 1fr 1fr; gap: clamp(2rem,4vw,3.5rem); align-items: start; }
@media (max-width: 820px){ .contact-grid { grid-template-columns: 1fr; } }
.info-block { padding: 1.4rem 0; border-bottom: 1px solid var(--line); }
.info-block:first-child { border-top: 1px solid var(--line); }
.info-block .label { font-family: var(--font-display); font-size: .78rem; letter-spacing: .14em; text-transform: uppercase; color: var(--accent-text); }
.map-embed { aspect-ratio: 4/3; border:1px solid var(--line); border-radius: var(--radius); width:100%; }

/* --------------------------------------------------------------- Newsletter */
.cta {
  background: var(--ink); color: var(--bg); border-radius: 8px;
  padding: clamp(2rem, 5vw, 3.5rem); display: grid; grid-template-columns: 1.2fr 1fr; gap: 2rem; align-items: center;
}
@media (max-width:760px){ .cta { grid-template-columns: 1fr; } }
.cta h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
.cta p { color: color-mix(in srgb, var(--bg) 75%, transparent); margin-top: .6rem; }
.cta-form { display: flex; gap: .6rem; flex-wrap: wrap; }
.cta-form input { flex: 1 1 200px; padding: .85em 1em; border-radius: var(--radius); border: 1px solid color-mix(in srgb,var(--bg) 30%, transparent); background: rgba(255,255,255,.06); color: var(--bg); }
.cta-form input::placeholder { color: color-mix(in srgb,var(--bg) 55%, transparent); }

/* ----------------------------------------------------------- Partners strip */
.partners { display: flex; flex-wrap: wrap; gap: 1rem 2.5rem; align-items: center; }
.partner-logo {
  height: 54px; min-width: 120px; padding: 0 1.2rem; display: grid; place-items: center;
  border: 1px dashed var(--line); border-radius: var(--radius);
  font-family: var(--font-display); font-weight: 600; color: var(--muted); font-size: .9rem; letter-spacing: .04em;
}

/* ---------------------------------------------------------------- Footer */
.site-footer { background: var(--ink); color: var(--bg); padding-block: clamp(3rem,6vw,4.5rem) 2rem; margin-top: 2rem; }
.site-footer a { color: color-mix(in srgb, var(--bg) 80%, transparent); }
.site-footer a:hover { color: var(--accent); }
.footer-grid { display: grid; grid-template-columns: 1.4fr repeat(3, 1fr); gap: 2rem; }
@media (max-width: 820px){ .footer-grid { grid-template-columns: 1fr 1fr; } }
@media (max-width: 500px){ .footer-grid { grid-template-columns: 1fr; } }
.footer-col h4 { font-size: .82rem; letter-spacing: .14em; text-transform: uppercase; color: color-mix(in srgb,var(--bg) 60%, transparent); margin-bottom: 1rem; font-weight: 500; }
.footer-col li { margin-bottom: .55rem; }
.footer-brand p { color: color-mix(in srgb,var(--bg) 65%, transparent); max-width: 32ch; margin-top: 1rem; font-size: .92rem; }
.social { display: flex; gap: .7rem; margin-top: 1.2rem; }
.social a { width: 40px; height: 40px; border: 1px solid color-mix(in srgb,var(--bg) 25%, transparent); border-radius: 50%; display: grid; place-items: center; }
.social a:hover { background: var(--accent); border-color: var(--accent); color: #fff; }
.footer-bottom { margin-top: 3rem; padding-top: 1.5rem; border-top: 1px solid color-mix(in srgb,var(--bg) 18%, transparent); display: flex; justify-content: space-between; flex-wrap: wrap; gap: 1rem; font-size: .82rem; color: color-mix(in srgb,var(--bg) 55%, transparent); }

/* ------------------------------------------------------------- Utilities */
.center { text-align: center; }
.mt-1 { margin-top: 1rem; } .mt-2 { margin-top: 2rem; } .mt-3 { margin-top: 3rem; }
.divider { height: 1px; background: var(--line); border: 0; margin: 0; }
[hidden] { display: none !important; }
.reveal { opacity: 0; transform: translateY(18px); transition: opacity .6s ease, transform .6s ease; }
.reveal.in { opacity: 1; transform: none; }
@media (prefers-reduced-motion: reduce){ .reveal { opacity:1; transform:none; transition:none; } * { scroll-behavior:auto; } }

/* Skip link */
.skip { position: absolute; left: -999px; top: 0; background: var(--ink); color: var(--bg); padding: .6em 1em; z-index: 200; }
.skip:focus { left: 0; }

/* --------------------------------------------------------- Real images */
.hero__art img, .feature-art img { width: 100%; height: 100%; object-fit: cover; display: block; }
.news-card__media img { width: 100%; height: 100%; object-fit: cover; display: block; }

/* Axis card with image media (home) */
.axis-media { overflow: hidden; padding: 0; }
.axis-media__img { aspect-ratio: 16/11; overflow: hidden; background: var(--bg-alt); }
.axis-media__img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s ease; }
.axis-media:hover .axis-media__img img { transform: scale(1.05); }
.axis-media__body { padding: 1.3rem 1.4rem 1.5rem; display: flex; flex-direction: column; gap: .5rem; }
.axis-media__body .card__num { font-size: .8rem; }

/* Feature (expertise detail) image block */
.feature-art { aspect-ratio: 4/3; border-radius: var(--radius); overflow: hidden; background: var(--ink); }

/* Partner logos as images */
.partners { gap: 1.5rem; }
.partner-logo {
  height: 92px; width: 100%; padding: 1.1rem 1.3rem; background: var(--card);
  border: 1px solid var(--line); border-radius: var(--radius);
  display: grid; place-items: center;
}
.partner-logo img { max-height: 100%; max-width: 100%; width: auto; object-fit: contain; filter: grayscale(1); opacity: .72; transition: filter .25s ease, opacity .25s ease; }
.partner-logo:hover img { filter: grayscale(0); opacity: 1; }
.partners-grid { display: grid; grid-template-columns: repeat(5, 1fr); gap: 1rem; }
@media (max-width: 900px){ .partners-grid { grid-template-columns: repeat(3, 1fr); } }
@media (max-width: 560px){ .partners-grid { grid-template-columns: repeat(2, 1fr); } }

/* Member initials monogram */
.member__avatar.mono { display: grid; place-items: center; background: var(--ink); color: var(--bg); }
.member__avatar.mono span { font-family: var(--font-display); font-weight: 600; font-size: 2rem; letter-spacing: -.02em; }

/* Committee member lists */
.people { display: grid; gap: .9rem; margin-top: 1.2rem; }
.person { padding-bottom: .9rem; border-bottom: 1px solid var(--line); }
.person strong { font-weight: 600; }
.person span { display: block; color: var(--muted); font-size: .88rem; margin-top: .15rem; }