/* ============================================
   LUTECIUM — style.css
   Feuille de styles partagée
   ============================================ */

@import url('https://fonts.googleapis.com/css2?family=DM+Serif+Display:ital@0;1&family=DM+Sans:wght@300;400;500;600&display=swap');

/* ---------- Reset & Base ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --c-forest:   #0d2b22;
  --c-green:    #1D9E75;
  --c-green-lt: #E1F5EE;
  --c-amber:    #EF9F27;
  --c-amber-lt: #FAEEDA;
  --c-blue:     #378ADD;
  --c-blue-lt:  #E6F1FB;
  --c-ink:      #1a1a18;
  --c-slate:    #444440;
  --c-muted:    #777774;
  --c-border:   #e4e4e0;
  --c-bg:       #f8f6f2;
  --c-white:    #ffffff;
  --font-serif: 'DM Serif Display', Georgia, serif;
  --font-sans:  'DM Sans', system-ui, sans-serif;
  --r-sm:  6px;
  --r-md:  10px;
  --r-lg:  16px;
  --max-w: 1080px;
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.7;
  color: var(--c-ink);
  background: var(--c-bg);
}

img { display: block; max-width: 100%; }
a { color: var(--c-green); text-decoration: none; }
a:hover { text-decoration: underline; }
strong { font-weight: 600; }

/* ---------- Layout ---------- */
.container {
  max-width: var(--max-w);
  margin: 0 auto;
  padding: 0 28px;
}

.section        { padding: 80px 0; }
.section--dark  { background: var(--c-forest); color: var(--c-white); }
.section--light { background: var(--c-white); }
.section--tint  { background: var(--c-bg); }

.grid-2 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr)); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 16px; }

/* ---------- Typography ---------- */
.eyebrow {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--c-green);
  margin-bottom: 14px;
  display: block;
}

.section--dark .eyebrow { color: #9FE1CB; }

h1, .h1 {
  font-family: var(--font-serif);
  font-size: clamp(32px, 5vw, 56px);
  font-weight: 400;
  line-height: 1.12;
  color: var(--c-ink);
  margin-bottom: 24px;
}

h2, .h2 {
  font-family: var(--font-serif);
  font-size: clamp(24px, 3.5vw, 38px);
  font-weight: 400;
  line-height: 1.2;
  color: var(--c-ink);
  margin-bottom: 16px;
}

h3, .h3 {
  font-family: var(--font-sans);
  font-size: 17px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--c-ink);
  margin-bottom: 10px;
}

h4, .h4 {
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--c-slate);
  margin-bottom: 8px;
}

.lead {
  font-size: 19px;
  line-height: 1.65;
  color: var(--c-slate);
  margin-bottom: 36px;
  max-width: 660px;
}

p { color: var(--c-slate); margin-bottom: 14px; }
p:last-child { margin-bottom: 0; }

.section--dark h1,
.section--dark h2,
.section--dark h3 { color: var(--c-white); }
.section--dark p   { color: rgba(255,255,255,.72); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: var(--r-sm);
  font-family: var(--font-sans);
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: opacity .18s, transform .18s;
  cursor: pointer;
  border: none;
}
.btn:hover { opacity: .88; transform: translateY(-1px); text-decoration: none; }
.btn--green  { background: var(--c-green); color: #fff; }
.btn--white  { background: #fff; color: var(--c-forest); }
.btn--ghost  { background: transparent; color: var(--c-ink); border: 1.5px solid var(--c-border); }
.btn--ghost:hover { border-color: var(--c-green); color: var(--c-green); }

.btn-group { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 8px; }

/* ---------- Tags / Badges ---------- */
.tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 20px 0; }

.tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  padding: 4px 13px;
  border-radius: 20px;
  border: 1px solid transparent;
}
.tag--green  { background: var(--c-green-lt); color: #085041; border-color: #9FE1CB; }
.tag--amber  { background: var(--c-amber-lt); color: #854F0B; border-color: #FAC775; }
.tag--blue   { background: var(--c-blue-lt);  color: #0C447C; border-color: #B5D4F4; }
.tag--gray   { background: #F1EFE8;            color: #5F5E5A; border-color: #D3D1C7; }

/* ---------- Cards ---------- */
.card {
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-lg);
  padding: 28px;
}

.card--accent-green  { border-top: 3px solid var(--c-green); }
.card--accent-amber  { border-top: 3px solid var(--c-amber); }
.card--accent-blue   { border-top: 3px solid var(--c-blue); }

.card--stripe {
  border-left: 3px solid var(--c-green);
  border-radius: 0 var(--r-lg) var(--r-lg) 0;
  border-top: 1px solid var(--c-border);
  border-right: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}
.card--stripe-amber { border-left-color: var(--c-amber); }
.card--stripe-blue  { border-left-color: var(--c-blue); }

.pillar-badge {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: .06em;
  padding: 4px 12px;
  border-radius: 20px;
  margin-bottom: 16px;
}
.pillar-badge--1 { background: var(--c-green-lt); color: #085041; }
.pillar-badge--2 { background: var(--c-amber-lt); color: #854F0B; }

.divider { border: none; border-top: 1px solid var(--c-border); margin: 32px 0; }

/* ---------- Timeline ---------- */
.timeline { position: relative; padding-left: 28px; max-width: 720px; }
.timeline::before {
  content: '';
  position: absolute;
  left: 7px; top: 10px; bottom: 10px;
  width: 2px;
  background: var(--c-border);
}
.timeline-item { position: relative; margin-bottom: 36px; }
.timeline-item::before {
  content: '';
  position: absolute;
  left: -24px; top: 7px;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--c-green);
  box-shadow: 0 0 0 3px var(--c-bg), 0 0 0 5px var(--c-green);
}
.timeline-date  { font-size: 12px; font-weight: 600; color: var(--c-green); letter-spacing: .06em; margin-bottom: 4px; }
.timeline-title { font-size: 16px; font-weight: 600; color: var(--c-ink); margin-bottom: 8px; }

/* ---------- Realisation ---------- */
.realisation {
  padding: 22px 22px 22px 26px;
  border-left: 3px solid var(--c-green);
  background: var(--c-white);
  border-radius: 0 var(--r-md) var(--r-md) 0;
  border-top: 1px solid var(--c-border);
  border-right: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
  margin-bottom: 16px;
}
.realisation-title { font-size: 15px; font-weight: 600; color: var(--c-ink); margin-bottom: 8px; }

/* ---------- Ecosystem Cards ---------- */
.eco-card {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 18px 20px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
}
.eco-dot {
  flex-shrink: 0;
  width: 9px; height: 9px;
  border-radius: 50%;
  margin-top: 6px;
}
.eco-name { font-size: 14px; font-weight: 600; color: var(--c-ink); margin-bottom: 3px; }
.eco-desc { font-size: 13px; color: var(--c-muted); line-height: 1.5; }

/* ---------- Certifications ---------- */
.certif-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: var(--r-md);
}
.certif-dot { flex-shrink:0; width:8px; height:8px; border-radius:50%; margin-top:6px; }
.certif-text { font-size: 13px; color: var(--c-slate); line-height: 1.5; }

/* ---------- Report List ---------- */
.report-list { list-style: none; padding: 0; margin: 12px 0 0; }
.report-list li {
  font-size: 13px; color: var(--c-slate);
  padding: 5px 0 5px 18px;
  position: relative; line-height: 1.5;
  border-bottom: 1px solid #f0ede8;
}
.report-list li:last-child { border-bottom: none; }
.report-list li::before { content: '→'; position: absolute; left: 0; color: var(--c-green); font-weight: 600; }

/* ---------- CTA Band ---------- */
.cta-band {
  background: var(--c-forest);
  border-radius: var(--r-lg);
  padding: 60px 48px;
  text-align: center;
}
.cta-band h2 { color: var(--c-white); margin-bottom: 14px; }
.cta-band p  { color: rgba(255,255,255,.65); margin-bottom: 32px; font-size: 17px; }

/* ---------- Nav ---------- */
nav {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(248, 246, 242, .92);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--c-border);
}
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
  gap: 24px;
}
.nav-logo {
  font-family: var(--font-serif);
  font-size: 22px;
  color: var(--c-forest);
  text-decoration: none;
  letter-spacing: -.01em;
}
.nav-logo span { color: var(--c-green); }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--c-slate);
  padding: 6px 12px;
  border-radius: var(--r-sm);
  text-decoration: none;
  transition: background .15s, color .15s;
}
.nav-links a:hover { background: var(--c-green-lt); color: var(--c-green); }
.nav-links a.active { color: var(--c-green); font-weight: 600; }
.lang-switch {
  display: flex;
  align-items: center;
  gap: 4px;
  font-size: 13px;
  font-weight: 500;
  background: var(--c-white);
  border: 1px solid var(--c-border);
  border-radius: 20px;
  padding: 4px 14px;
  color: var(--c-slate);
  text-decoration: none;
  transition: border-color .15s;
}
.lang-switch:hover { border-color: var(--c-green); color: var(--c-green); text-decoration: none; }
.lang-switch .lang-sep { opacity: .3; margin: 0 4px; }
.lang-switch .lang-active { color: var(--c-green); font-weight: 700; }
.lang-switch .lang-other { color: var(--c-muted); }

/* ---------- Hero ---------- */
.hero {
  background: var(--c-forest);
  padding: 96px 0 80px;
  overflow: hidden;
  position: relative;
}
.hero::after {
  content: '';
  position: absolute;
  right: -80px; top: -80px;
  width: 520px; height: 520px;
  border-radius: 50%;
  border: 1px solid rgba(29,158,117,.18);
  pointer-events: none;
}
.hero-eyebrow { color: #9FE1CB; }
.hero h1      { color: var(--c-white); }
.hero .lead   { color: rgba(255,255,255,.7); }

/* ---------- Founder Hero ---------- */
.founder-grid {
  display: grid;
  grid-template-columns: 1fr 220px;
  gap: 52px;
  align-items: start;
}
.founder-photo {
  width: 220px; height: 260px;
  border-radius: var(--r-lg);
  object-fit: cover;
  border: 1px solid var(--c-border);
}
.founder-initials {
  width: 220px; height: 260px;
  background: var(--c-green-lt);
  border: 1px solid #9FE1CB;
  border-radius: var(--r-lg);
  display: flex; align-items: center; justify-content: center;
  font-family: var(--font-serif);
  font-size: 64px;
  color: var(--c-green);
}

/* ---------- Contact Form ---------- */
.form-grid  { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-group { display: flex; flex-direction: column; gap: 6px; }
.form-group.full { grid-column: 1 / -1; }

label { font-size: 13px; font-weight: 500; color: var(--c-slate); }

input, textarea, select {
  font-family: var(--font-sans);
  font-size: 15px;
  padding: 11px 14px;
  border: 1.5px solid var(--c-border);
  border-radius: var(--r-sm);
  background: var(--c-white);
  color: var(--c-ink);
  transition: border-color .15s;
  width: 100%;
}
input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--c-green);
  box-shadow: 0 0 0 3px rgba(29,158,117,.1);
}
textarea { resize: vertical; min-height: 140px; }

.form-note { font-size: 13px; color: var(--c-muted); }

/* ---------- Footer ---------- */
footer {
  background: var(--c-forest);
  color: rgba(255,255,255,.55);
  padding: 40px 0;
  font-size: 14px;
}
.footer-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
}
.footer-logo {
  font-family: var(--font-serif);
  font-size: 20px;
  color: var(--c-white);
  text-decoration: none;
}
.footer-links { display: flex; gap: 20px; }
.footer-links a { color: rgba(255,255,255,.55); text-decoration: none; font-size: 13px; }
.footer-links a:hover { color: #9FE1CB; text-decoration: none; }
.footer-copy { font-size: 13px; }

/* ---------- Responsive ---------- */
@media (max-width: 720px) {
  .section { padding: 56px 0; }
  .hero    { padding: 64px 0 56px; }
  .container { padding: 0 18px; }
  .form-grid { grid-template-columns: 1fr; }
  .founder-grid { grid-template-columns: 1fr; }
  .founder-photo, .founder-initials { width: 100px; height: 120px; font-size: 32px; }
  .cta-band { padding: 40px 24px; }
  .nav-links a:not(.active):not(:last-child) { display: none; }
  .hero::after { display: none; }
}