/* =========================================================
   HAVENIXCI — Design system v2
   Direction : confiance institutionnelle, sobriété premium.
   Palette : vert émeraude profond quasi-noir + or antique,
   sur un fond pierre chaude. Corners nets, hairlines fins,
   ombres longues et douces — le vocabulaire visuel du droit,
   de la banque privée et du notariat plutôt que celui d'une
   app grand public.
   Signature : un fin quadrillage cadastral en filigrane dans
   le hero — le langage même du géomètre qui borne un terrain,
   directement lié au cœur de métier (terrains, lotissement).
   ========================================================= */

:root {
  /* Couleurs */
  --color-bg:        #F6F3EC;
  --color-bg-alt:    #ECE6D8;
  --color-surface:   #FFFFFF;
  --color-ink:       #14201B;
  --color-ink-soft:  #4E594F;
  --color-ink-faint: #7C8579;

  --color-primary:      #0E2B24;
  --color-primary-dark: #081A15;
  --color-primary-tint: #E7EDE9;

  --color-accent:       #A9782E;
  --color-accent-light: #C9A055;
  --color-accent-tint:  #F2E9D6;

  --color-line:        #DBD2BC;
  --color-line-strong: #C6B896;
  --color-erreur:      #96402B;

  /* Typographie */
  --font-display: "Fraunces", Georgia, serif;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono: "IBM Plex Mono", ui-monospace, monospace;

  --step-h1: clamp(2.35rem, 3.2vw + 1.2rem, 3.9rem);
  --step-h2: clamp(1.7rem, 1.6vw + 1.1rem, 2.5rem);
  --step-h3: clamp(1.1rem, 0.6vw + 0.9rem, 1.3rem);
  --step-body: clamp(1rem, 0.2vw + 0.95rem, 1.08rem);
  --step-lead: clamp(1.1rem, 0.4vw + 1rem, 1.3rem);

  /* Rythme / espacement */
  --section-pad-y: clamp(4.5rem, 7vw, 8.5rem);
  --container-width: 1120px;
  --radius-sm: 4px;
  --radius: 8px;
  --shadow-soft: 0 30px 60px -35px rgba(8, 26, 21, 0.35);
  --shadow-lift: 0 14px 30px -18px rgba(8, 26, 21, 0.28);

  /* Mouvement */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --dur-fast: 200ms;
  --dur-med: 460ms;
}

/* ---------- Reset minimal ---------- */
*, *::before, *::after { box-sizing: border-box; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: 104px;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--step-body);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-display);
  color: var(--color-primary);
  line-height: 1.08;
  margin: 0 0 0.55em;
  letter-spacing: -0.012em;
}

h1 { font-size: var(--step-h1); font-weight: 600; }
h2 { font-size: var(--step-h2); font-weight: 600; }
h3 { font-size: var(--step-h3); font-weight: 600; margin-bottom: 0.45em; }

p { margin: 0 0 1em; color: var(--color-ink-soft); }

ul, ol { margin: 0; padding: 0; list-style: none; }

a {
  color: inherit;
  text-decoration: none;
}

img { max-width: 100%; display: block; }

/* ---------- Accessibilité ---------- */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 0.9em 1.4em;
  z-index: 1000;
  border-radius: 0 0 var(--radius) 0;
  font-weight: 600;
}
.skip-link:focus { left: 0; }

:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 3px;
  border-radius: 2px;
}

.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ---------- Layout utilitaire ---------- */
.container {
  width: 100%;
  max-width: var(--container-width);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 4vw, 2.75rem);
}
.container-etroit { max-width: 740px; }

section { padding-block: var(--section-pad-y); }

section:nth-of-type(even) { background: var(--color-bg-alt); }

/* Séparateur discret et centré plutôt qu'un trait plein-largeur */
section + section::before,
section::after { content: none; }

section:not(#hero) {
  position: relative;
}
section:not(#hero):not(:first-of-type)::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 64px;
  height: 1px;
  background: var(--color-line-strong);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin: 0 0 1em;
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 1px;
  background: var(--color-accent);
}

/* ---------- En-tête / navigation ---------- */
header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(246, 243, 236, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-line);
}

nav {
  max-width: var(--container-width);
  margin-inline: auto;
  padding: 1.1rem clamp(1.25rem, 4vw, 2.75rem);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.logo a {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.35rem;
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

nav ul {
  display: flex;
  align-items: center;
  gap: clamp(1.1rem, 1.8vw, 1.9rem);
  flex-wrap: wrap;
}

nav ul li a {
  font-size: 0.82rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  color: var(--color-ink-soft);
  position: relative;
  padding-block: 0.3em;
  transition: color var(--dur-fast) var(--ease);
}

nav ul li a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -3px;
  width: 100%;
  height: 1px;
  background: var(--color-accent);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur-fast) var(--ease);
}

nav ul li a:hover,
nav ul li a:focus-visible,
nav ul li a.actif {
  color: var(--color-primary);
}
nav ul li a:hover::after,
nav ul li a:focus-visible::after,
nav ul li a.actif::after {
  transform: scaleX(1);
}

nav ul li a.nav-cta {
  background: var(--color-primary);
  color: #F6F3EC;
  padding: 0.6em 1.3em;
  border-radius: var(--radius-sm);
  transition: background var(--dur-fast) var(--ease);
}
nav ul li a.nav-cta::after { display: none; }
nav ul li a.nav-cta:hover,
nav ul li a.nav-cta:focus-visible {
  background: var(--color-primary-dark);
}

.menu-toggle-input { display: none; }
.menu-toggle-label {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  cursor: pointer;
}
.menu-toggle-label span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--color-primary);
}

/* ---------- Hero ---------- */
#hero {
  position: relative;
  border-bottom: none;
  overflow: hidden;
  background: linear-gradient(175deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: #F6F3EC;
  padding-block: clamp(5rem, 11vw, 9rem) clamp(4.5rem, 8vw, 7rem);
}

/* Signature : quadrillage cadastral en filigrane — le tracé d'un géomètre */
#hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(246, 243, 236, 0.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(246, 243, 236, 0.055) 1px, transparent 1px);
  background-size: 64px 64px;
  mask-image: radial-gradient(ellipse 80% 70% at 70% 20%, black 10%, transparent 75%);
  pointer-events: none;
}

#hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(900px 500px at 88% -8%, rgba(169, 120, 46, 0.22), transparent 62%);
  pointer-events: none;
}

.hero-inner {
  position: relative;
  max-width: 760px;
}

#hero .eyebrow { color: var(--color-accent-light); }
#hero .eyebrow::before { background: var(--color-accent-light); }

#hero h1 {
  color: #FBF9F3;
  animation: apparition var(--dur-med) var(--ease) both;
}

.hero-texte {
  font-size: var(--step-lead);
  color: rgba(251, 249, 243, 0.8);
  max-width: 54ch;
  animation: apparition var(--dur-med) var(--ease) both;
  animation-delay: 90ms;
}

.hero-boutons {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 1.75rem;
  animation: apparition var(--dur-med) var(--ease) both;
  animation-delay: 180ms;
}

@keyframes apparition {
  from { opacity: 0; transform: translateY(14px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ---------- Boutons ---------- */
.bouton {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85em 1.7em;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.92rem;
  letter-spacing: 0.01em;
  border: 1px solid transparent;
  transition: transform var(--dur-fast) var(--ease),
              background var(--dur-fast) var(--ease),
              border-color var(--dur-fast) var(--ease),
              box-shadow var(--dur-fast) var(--ease);
  cursor: pointer;
}

.bouton-principal {
  background: var(--color-accent);
  color: #1B140A;
}
.bouton-principal:hover,
.bouton-principal:focus-visible {
  background: var(--color-accent-light);
  box-shadow: var(--shadow-lift);
}

.bouton-secondaire {
  background: transparent;
  color: #F6F3EC;
  border-color: rgba(246, 243, 236, 0.35);
}
.bouton-secondaire:hover,
.bouton-secondaire:focus-visible {
  border-color: #F6F3EC;
}

#formulaire .bouton-principal {
  color: #FBF9F3;
  background: var(--color-primary);
}
#formulaire .bouton-principal:hover,
#formulaire .bouton-principal:focus-visible {
  background: var(--color-primary-dark);
  box-shadow: var(--shadow-lift);
}

/* ---------- Texte large (intro) ---------- */
.texte-large { font-size: var(--step-lead); max-width: 65ch; }

/* ---------- Cartes ---------- */
.cartes {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 1px;
  margin-top: 2.25rem;
  background: var(--color-line);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.carte {
  background: var(--color-surface);
  padding: 1.9rem 1.6rem;
  position: relative;
  transition: background var(--dur-fast) var(--ease);
}

.carte::before {
  content: "";
  position: absolute;
  left: 0; top: 0; bottom: 0;
  width: 2px;
  background: var(--color-accent);
  transform: scaleY(0);
  transform-origin: top;
  transition: transform var(--dur-med) var(--ease);
}

.carte:hover,
.carte:focus-within { background: var(--color-primary-tint); }
.carte:hover::before,
.carte:focus-within::before { transform: scaleY(1); }

.carte h3 { font-size: 1.08rem; margin-bottom: 0.3em; }
.carte p { margin-bottom: 0; font-size: 0.94rem; }
.cartes-biens .carte h3 { display: flex; align-items: center; gap: 0.55em; }

/* ---------- Listes à puce (atouts / engagements) ---------- */
.liste-atouts,
.liste-engagements {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem 2.25rem;
  margin-top: 2rem;
}

.liste-atouts li,
.liste-engagements li {
  position: relative;
  padding-left: 2em;
  font-weight: 500;
  color: var(--color-ink);
}

.liste-atouts li::before,
.liste-engagements li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.15em;
  width: 22px;
  height: 22px;
  border-radius: 50%;
  border: 1px solid var(--color-accent);
  background:
    linear-gradient(var(--color-accent), var(--color-accent)) center / 7px 7px no-repeat,
    transparent;
}

/* ---------- Notre méthode : ligne du temps ---------- */
.etapes {
  position: relative;
  margin-top: 2.75rem;
  counter-reset: etape;
}

.etapes::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: var(--color-line-strong);
}

.etape {
  position: relative;
  padding-left: 3.4rem;
  padding-bottom: 2.5rem;
  counter-increment: etape;
}
.etape:last-child { padding-bottom: 0; }

.etape::before {
  content: counter(etape, decimal-leading-zero);
  position: absolute;
  left: 0;
  top: 0;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #F6F3EC;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 5px var(--color-bg);
}
section:nth-of-type(even) .etape::before { box-shadow: 0 0 0 5px var(--color-bg-alt); }

.etape h3 { margin-bottom: 0.2em; }
.etape p { margin-bottom: 0; }

/* ---------- FAQ — liste éditoriale, pas de cartes ---------- */
#faq dl {
  margin-top: 2.25rem;
  border-top: 1px solid var(--color-line);
}

.faq-item { border-bottom: 1px solid var(--color-line); }

.faq-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  width: 100%;
  background: none;
  border: none;
  padding: 1.4rem 0;
  font: inherit;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 600;
  color: var(--color-primary);
  font-size: 1.08rem;
  transition: color var(--dur-fast) var(--ease);
}
.faq-toggle:hover { color: var(--color-accent); }

.faq-toggle .faq-icone {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--color-accent);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1rem;
  line-height: 1;
  transition: transform var(--dur-med) var(--ease), background var(--dur-fast) var(--ease), color var(--dur-fast) var(--ease);
}
.faq-toggle[aria-expanded="true"] .faq-icone {
  transform: rotate(45deg);
  background: var(--color-accent);
  color: var(--color-primary-dark);
}

.faq-item dd { margin: 0; }
.faq-item dd[hidden] { display: none; }
.faq-item dd:not([hidden]) {
  padding-bottom: 1.5rem;
  max-width: 68ch;
  animation: apparition var(--dur-fast) var(--ease) both;
}

/* ---------- Formulaire ---------- */
form { margin-top: 2.25rem; display: grid; gap: 1.75rem; }

fieldset {
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  padding: 1.6rem;
  background: var(--color-surface);
}

legend {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.02rem;
  color: var(--color-primary);
  padding: 0 0.5em;
}

.options {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(195px, 1fr));
  gap: 0.6rem 1rem;
  margin-top: 0.85rem;
}

.options label {
  display: flex;
  align-items: center;
  gap: 0.65em;
  padding: 0.7em 0.95em;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 0.9rem;
  transition: border-color var(--dur-fast) var(--ease), background var(--dur-fast) var(--ease);
}
.options label:hover { border-color: var(--color-accent); }

.options input[type="radio"] {
  accent-color: var(--color-primary);
  width: 1.05em;
  height: 1.05em;
  flex-shrink: 0;
}

.options label:has(input:checked) {
  border-color: var(--color-primary);
  background: var(--color-primary-tint);
  font-weight: 600;
}

.champ { display: grid; gap: 0.5rem; }

.champ label {
  font-weight: 600;
  font-size: 0.9rem;
  color: var(--color-primary);
}

.champ input[type="text"],
.champ input[type="tel"],
.champ input[type="email"],
.champ textarea {
  font: inherit;
  padding: 0.8em 1em;
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-ink);
  transition: border-color var(--dur-fast) var(--ease), box-shadow var(--dur-fast) var(--ease);
}
.champ input:focus,
.champ textarea:focus {
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-tint);
}
.champ textarea { resize: vertical; min-height: 110px; }

.champ-envoi { margin-top: 0.5rem; }
.champ-envoi .bouton { width: 100%; }

.champ-erreur { color: var(--color-erreur); font-size: 0.85rem; margin: 0.35em 0 0; }
.champ.invalide input,
.champ.invalide textarea { border-color: var(--color-erreur); }

/* ---------- Assistant de formulaire (mode JS) ---------- */
.assistant-progression { display: flex; align-items: center; gap: 1rem; margin-bottom: 0.5rem; }
.assistant-barre { flex: 1; height: 2px; background: var(--color-line); }
.assistant-barre-remplissage {
  height: 100%;
  background: var(--color-accent);
  transition: width var(--dur-med) var(--ease);
}
.assistant-etape-texte {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--color-ink-faint);
  white-space: nowrap;
}
form[data-mode="assistant"] .etape-form { animation: apparition var(--dur-med) var(--ease) both; }

.etape-navigation { display: flex; justify-content: space-between; gap: 1rem; margin-top: 0.25rem; }

.bouton-navigation {
  background: transparent;
  border: 1px solid var(--color-line);
  color: var(--color-ink);
  padding: 0.75em 1.5em;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.88rem;
  cursor: pointer;
  transition: border-color var(--dur-fast) var(--ease);
}
.bouton-navigation:hover,
.bouton-navigation:focus-visible { border-color: var(--color-accent); }
.bouton-navigation:disabled { opacity: 0.4; cursor: not-allowed; }

/* ---------- Apparition au défilement ---------- */
.reveal {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 750ms var(--ease), transform 750ms var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }
#hero .reveal { opacity: 1; transform: none; transition: none; }

/* ---------- Pied de page ---------- */
footer {
  padding-block: 3rem 2.25rem;
  background: var(--color-primary-dark);
  color: rgba(246, 243, 236, 0.72);
  border-top: 1px solid rgba(169, 120, 46, 0.4);
}
.footer-inner { text-align: center; }
.footer-tagline {
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: rgba(246, 243, 236, 0.92);
  max-width: 48ch;
  margin-inline: auto;
}
.footer-copyright {
  margin: 1.25rem 0 0;
  font-size: 0.82rem;
  color: rgba(246, 243, 236, 0.55);
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 860px) {
  nav ul {
    position: fixed;
    inset: 72px 0 0 0;
    height: calc(100vh - 72px);
    background: var(--color-bg);
    flex-direction: column;
    align-items: flex-start;
    padding: 2rem clamp(1.25rem, 6vw, 2.5rem);
    gap: 1.4rem;
    transform: translateX(100%);
    transition: transform var(--dur-med) var(--ease);
    overflow-y: auto;
  }
  .menu-toggle-label { display: flex; }
  .menu-toggle-input:checked ~ ul { transform: translateX(0); }
  nav ul li a { font-size: 0.98rem; }
}

@media (max-width: 600px) {
  .cartes { grid-template-columns: 1fr; }
  .liste-atouts, .liste-engagements { grid-template-columns: 1fr; }
  .options { grid-template-columns: 1fr; }
  fieldset { padding: 1.1rem; }
}