/* =========================================================
   ATELIER — Design system
   Direction : papier de calque + grille de plan d'architecte
   ========================================================= */

:root{
  --paper:        #F5F5F1;
  --paper-line:   #E4E2DA;
  --ink:          #1C1F1D;
  --ink-soft:     #5B5F58;
  --blueprint:    #2B4C7E;
  --blueprint-soft: #D8E1EC;
  --brass:        #9C7A44;
  --line:         #C9C5B8;
  --white:        #FFFFFF;

  --font-display: 'Fraunces', Georgia, serif;
  --font-body:    'Inter', -apple-system, sans-serif;
  --font-mono:    'IBM Plex Mono', 'Courier New', monospace;
}

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

html{ scroll-behavior:smooth; }

body{
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
}

a{ color:inherit; text-decoration:none; }
ul{ list-style:none; }

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

/* ---------- grille de plan (texture de fond) ---------- */
.blueprint-grid{
  background-image:
    linear-gradient(var(--paper-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--paper-line) 1px, transparent 1px);
  background-size: 32px 32px;
}

/* ---------- repères d'angle façon feuille de dessin technique ---------- */
.crop-marks{ position:relative; }
.crop-marks::before,
.crop-marks::after{
  content:"";
  position:absolute;
  width:18px; height:18px;
  border-top:1.5px solid var(--ink);
  border-left:1.5px solid var(--ink);
  top:18px; left:18px;
  opacity:.55;
}
.crop-marks::after{
  top:auto; left:auto; bottom:18px; right:18px;
  border-top:none; border-left:none;
  border-bottom:1.5px solid var(--ink);
  border-right:1.5px solid var(--ink);
}

/* ---------- conteneurs ---------- */
.wrap{
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 32px;
}

/* ---------- en-tête commun ---------- */
.site-header{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding: 26px 32px;
  border-bottom: 1px solid var(--line);
}
.brand{
  font-family: var(--font-display);
  font-size: 1.35rem;
  letter-spacing: .01em;
}
.brand span{ color: var(--blueprint); }
.brand-tag{
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--ink-soft);
}

/* =========================================================
   PAGE D'ACCUEIL
   ========================================================= */

.hero{
  padding: 96px 32px 64px;
  text-align:center;
  position:relative;
}
.hero-eyebrow{
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--blueprint);
  margin-bottom: 22px;
}
.hero h1{
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(2.4rem, 5vw, 4.2rem);
  line-height: 1.08;
  max-width: 820px;
  margin: 0 auto 22px;
}
.hero h1 em{
  font-style: italic;
  color: var(--blueprint);
}
.hero p{
  max-width: 520px;
  margin: 0 auto;
  color: var(--ink-soft);
  font-size: 1.05rem;
}

/* ---------- formules ---------- */
.formules{
  padding: 40px 32px 120px;
}
.formules-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  max-width: 1180px;
  margin: 0 auto 34px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 18px;
}
.formules-head h2{
  font-family: var(--font-display);
  font-weight:500;
  font-size: 1.6rem;
}
.formules-head .count{
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--ink-soft);
}

.formule-grid{
  max-width: 1180px;
  margin: 0 auto;
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.formule-card{
  background: var(--paper);
  padding: 40px 32px 36px;
  display:flex;
  flex-direction:column;
  min-height: 460px;
  transition: background .25s ease;
}
.formule-card:hover{ background: var(--white); }

.formule-code{
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--ink-soft);
  letter-spacing: .08em;
  margin-bottom: 26px;
}

.formule-name{
  font-family: var(--font-display);
  font-size: 1.9rem;
  margin-bottom: 10px;
}

.formule-desc{
  color: var(--ink-soft);
  font-size: .92rem;
  margin-bottom: 26px;
  flex-grow: 1;
}

.swatches{
  display:flex;
  gap:6px;
  margin-bottom: 22px;
}
.swatches span{
  width: 16px; height:16px;
  border: 1px solid var(--ink);
}

.formule-list{
  font-family: var(--font-mono);
  font-size: .74rem;
  color: var(--ink-soft);
  margin-bottom: 30px;
  border-top: 1px dashed var(--line);
  padding-top: 16px;
}
.formule-list li{
  display:flex;
  justify-content:space-between;
  padding: 3px 0;
}

.btn-choisir{
  display:flex;
  align-items:center;
  justify-content:space-between;
  border: 1px solid var(--ink);
  padding: 14px 18px;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  background: transparent;
  cursor:pointer;
  transition: background .2s ease, color .2s ease;
}
.btn-choisir:hover{
  background: var(--ink);
  color: var(--paper);
}

/* variante signature (accent laiton) */
.formule-card.signature .formule-code{ color: var(--brass); }
.formule-card.signature .btn-choisir{ border-color: var(--brass); }
.formule-card.signature .btn-choisir:hover{ background: var(--brass); color:var(--white); }

.formule-card.selenite .formule-code{ color: var(--blueprint); }

/* ---------- pied de page ---------- */
.site-footer{
  border-top: 1px solid var(--line);
  padding: 26px 32px;
  display:flex;
  justify-content:space-between;
  font-family: var(--font-mono);
  font-size: .7rem;
  color: var(--ink-soft);
  letter-spacing: .04em;
}

/* =========================================================
   PAGE DE CONFIGURATION
   ========================================================= */

.banner{
  position:relative;
  height: 320px;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
  border-bottom: 1px solid var(--line);
}
.banner-illustration{
  position:absolute;
  inset:0;
  background: var(--ink);
}
.banner-illustration svg{
  position:absolute;
  bottom:0; left:0; right:0;
  width:100%; height:auto;
  opacity:.9;
}
.banner-overlay{
  position:relative;
  z-index:2;
  width:100%;
  padding: 30px 32px 26px;
  background: linear-gradient(0deg, rgba(28,31,29,.82) 10%, rgba(28,31,29,0) 100%);
}
.banner-eyebrow{
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  text-transform:uppercase;
  color: var(--blueprint-soft);
  margin-bottom: 10px;
}
.banner-overlay h1{
  font-family: var(--font-display);
  font-weight:500;
  color: var(--white);
  font-size: clamp(1.8rem, 3.4vw, 2.6rem);
}
.banner-overlay h1 em{
  font-style: italic;
  color: #E7C8A4;
}

/* ---------- corps de configuration ---------- */
.config-body{
  padding: 56px 32px 120px;
}
.config-layout{
  max-width: 1180px;
  margin:0 auto;
  display:grid;
  grid-template-columns: 1fr 320px;
  gap: 56px;
  align-items:start;
}

.category{
  margin-bottom: 54px;
}
.category:last-child{ margin-bottom:0; }

.category-head{
  display:flex;
  align-items:baseline;
  gap: 14px;
  border-bottom: 1px solid var(--ink);
  padding-bottom: 10px;
  margin-bottom: 22px;
}
.category-tag{
  font-family: var(--font-mono);
  font-size: .78rem;
  color: var(--blueprint);
  border: 1px solid var(--blueprint);
  padding: 2px 8px;
}
.category-head h2{
  font-family: var(--font-display);
  font-weight:500;
  font-size: 1.35rem;
}
.category-sub{
  margin-left:auto;
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--ink-soft);
}

.option-list{ display:flex; flex-direction:column; }

.option-row{
  display:flex;
  align-items:center;
  gap: 18px;
  padding: 16px 4px;
  border-bottom: 1px dashed var(--line);
}
.option-row:hover{ background: rgba(43,76,126,.04); }

.option-index{
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--ink-soft);
  width: 28px;
}

.option-checkbox{
  position:relative;
  width: 20px; height:20px;
  border: 1.5px solid var(--ink);
  flex-shrink:0;
  cursor:pointer;
}
.option-checkbox input{
  position:absolute;
  inset:0;
  opacity:0;
  cursor:pointer;
  margin:0;
}
.option-checkbox::after{
  content:"";
  position:absolute;
  top:3px; left:6px;
  width:5px; height:9px;
  border-right: 2px solid var(--blueprint);
  border-bottom: 2px solid var(--blueprint);
  transform: rotate(45deg);
  opacity:0;
}
.option-checkbox:has(input:checked){ border-color: var(--blueprint); background: var(--blueprint-soft); }
.option-checkbox:has(input:checked)::after{ opacity:1; }

.option-label{
  flex-grow:1;
  font-size: .96rem;
  cursor:pointer;
}
.option-note{
  display:block;
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--ink-soft);
  margin-top: 2px;
}

.option-level{
  font-family: var(--font-mono);
  font-size: .68rem;
  color: var(--ink-soft);
  letter-spacing: .05em;
  text-transform:uppercase;
}

/* ---------- panneau récap sticky ---------- */
.recap{
  position:sticky;
  top: 24px;
  border: 1px solid var(--ink);
  padding: 26px 24px;
  background: var(--white);
}
.recap-eyebrow{
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .12em;
  text-transform:uppercase;
  color: var(--ink-soft);
  margin-bottom: 8px;
}
.recap h3{
  font-family: var(--font-display);
  font-size: 1.3rem;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}
.recap-row{
  display:flex;
  justify-content:space-between;
  font-size: .82rem;
  color: var(--ink-soft);
  padding: 6px 0;
}
.recap-count{ color: var(--ink); font-family: var(--font-mono); }

.btn-envoyer{
  width:100%;
  margin-top: 22px;
  padding: 15px;
  background: var(--ink);
  color: var(--paper);
  border:none;
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  cursor:pointer;
  transition: background .2s ease;
}
.btn-envoyer:hover{ background: var(--blueprint); }

.back-link{
  display:inline-block;
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: .72rem;
  color: var(--ink-soft);
  text-decoration: underline;
}

@media (max-width: 860px){
  .formule-grid{ grid-template-columns: 1fr; }
  .config-layout{ grid-template-columns: 1fr; }
  .recap{ position:static; }
}