:root {
  --noir: #0e0e0e;
  --blanc: #f7f6f2;
  --rouge: #c8391a;
  --g1: #222;
  --g2: #444;
  --g3: #777;
  --g4: #bbb;
  --g5: #e6e6e2;
  --vert: #1a7a4a;
  --serif: 'Instrument Serif', Georgia, serif;
  --mono: 'DM Mono', monospace;
  --b: 1.5px solid #0e0e0e;
  --bl: 1px solid #d8d8d4;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: var(--mono); background: var(--blanc); color: var(--noir); font-size: 13px; line-height: 1.6; }

/* ── HEADER ── */
.site-header {
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: center;
  padding: 0 2rem;
  height: 48px;
  border-bottom: var(--b);
  background: var(--blanc);
  position: sticky;
  top: 0;
  z-index: 100;
}
.logo { font-size: 10px; letter-spacing: .14em; text-transform: uppercase; color: var(--g3); }
.logo strong { color: var(--noir); }
.back-link { font-size: 10px; letter-spacing: .08em; color: var(--g3); text-decoration: none; }
.back-link:hover { color: var(--rouge); }

/* ── PAGE TITLE ── */
.page-head {
  padding: 2rem 2rem 1.5rem;
  border-bottom: var(--b);
  display: grid;
  grid-template-columns: 1fr auto;
  align-items: end;
  gap: 2rem;
}
.page-title { font-family: var(--serif); font-size: 36px; font-weight: 400; line-height: 1; }
.page-title em { font-style: italic; color: var(--rouge); }
.page-subtitle { font-size: 11px; color: var(--g3); margin-top: .5rem; line-height: 1.6; }
.step-indicator { font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: var(--g4); text-align: right; }
.step-indicator strong { color: var(--noir); font-size: 24px; font-weight: 300; display: block; letter-spacing: -.02em; }

/* ── LAYOUT ── */
.form-layout {
  display: grid;
  grid-template-columns: 220px 1fr;
  min-height: calc(100vh - 130px);
}

/* ── NAV SECTIONS ── */
.form-nav {
  border-right: var(--b);
  padding: 1.5rem 0;
  position: sticky;
  top: 48px;
  height: calc(100vh - 48px);
  overflow-y: auto;
}
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: .6rem 1.5rem;
  font-size: 11px;
  color: var(--g3);
  cursor: pointer;
  transition: color .1s, background .1s;
  border: none;
  background: none;
  width: 100%;
  text-align: left;
  font-family: var(--mono);
}
.nav-item:hover { color: var(--noir); background: var(--g5); }
.nav-item.active { color: var(--noir); font-weight: 500; }
.nav-item.done { color: var(--vert); }
.nav-dot {
  width: 6px; height: 6px; border-radius: 50%;
  border: 1.5px solid var(--g4); flex-shrink: 0;
  transition: background .15s, border-color .15s;
}
.nav-item.active .nav-dot { border-color: var(--noir); background: var(--noir); }
.nav-item.done .nav-dot { border-color: var(--vert); background: var(--vert); }
.nav-section-label {
  font-size: 8px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--g4); padding: 1.25rem 1.5rem .35rem; display: block;
}

/* ── FORM BODY ── */
.form-body { padding: 0; }
.form-section {
  padding: 1.75rem 2rem 2rem;
  border-bottom: var(--bl);
  display: none;
}
.form-section.active { display: block; }
.section-title {
  font-size: 9px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--rouge); margin-bottom: 1.5rem; font-weight: 500;
  border-bottom: 1px solid var(--g5); padding-bottom: .4rem;
}

/* ── CHAMPS ── */
.field-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem 1.5rem; }
.field-grid.three { grid-template-columns: 1fr 1fr 1fr; }
.field-grid.full { grid-template-columns: 1fr; }
.field { display: flex; flex-direction: column; gap: 5px; }
.field.span2 { grid-column: span 2; }
.field.span3 { grid-column: span 3; }

label {
  font-size: 10px; letter-spacing: .06em; text-transform: uppercase;
  color: var(--g2); font-weight: 500;
}
.label-hint { font-size: 10px; color: var(--g4); font-weight: 400; letter-spacing: 0; text-transform: none; margin-left: .35rem; }

input[type="text"],
input[type="number"],
input[type="email"],
textarea,
select {
  font-family: var(--mono);
  font-size: 12px;
  color: var(--g1);
  background: var(--blanc);
  border: 1px solid var(--g4);
  padding: 8px 10px;
  border-radius: 0;
  outline: none;
  transition: border-color .15s;
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
}
input:focus, textarea:focus, select:focus { border-color: var(--noir); }
input.error, select.error, textarea.error { border-color: var(--rouge); }
.field-desc {
  display: none;
  margin-top: 6px;
  padding: 8px 10px;
  font-size: 10.5px;
  line-height: 1.65;
  color: var(--g2);
  background: var(--g5);
  border-left: 2px solid var(--g4);
}
.field-desc.visible { display: block; }
textarea { resize: vertical; min-height: 80px; }
select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%23777'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 10px center;
  padding-right: 28px;
}
.field-help { font-size: 10px; color: var(--g3); margin-top: 2px; }
.field-error { font-size: 10px; color: var(--rouge); margin-top: 2px; display: none; }
input.error ~ .field-error,
select.error ~ .field-error { display: block; }

/* ── UPLOAD PLANCHES ── */
.upload-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
  margin-top: .5rem;
}
.upload-cell {
  border: 1px dashed var(--g4);
  padding: .75rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  transition: border-color .15s, background .15s;
  position: relative;
}
.upload-cell:hover { border-color: var(--noir); background: var(--g5); }
.upload-cell.has-file { border-color: var(--vert); border-style: solid; }
.upload-cell input[type="file"] {
  position: absolute; inset: 0; opacity: 0; cursor: pointer;
  width: 100%; height: 100%; border: none; padding: 0;
}
.upload-icon { font-size: 20px; color: var(--g4); line-height: 1; }
.upload-cell.has-file .upload-icon { color: var(--vert); }
.upload-label {
  font-size: 9px; letter-spacing: .08em; text-transform: uppercase;
  color: var(--g3); text-align: center; line-height: 1.4;
}
.upload-cell.has-file .upload-label { color: var(--vert); }
.upload-echelle {
  font-size: 9px; color: var(--g4); text-align: center;
}
.upload-preview {
  width: 100%; aspect-ratio: 1;
  display: none; overflow: hidden;
  align-items: center; justify-content: center;
}
.upload-preview img, .upload-preview canvas { width: 100%; height: 100%; object-fit: contain; display: block; }
.upload-cell.has-file .upload-preview { display: flex; }
.upload-cell.has-file .upload-icon { display: none; }
.upload-legende {
  width: 100%; box-sizing: border-box;
  font-family: var(--mono); font-size: 9px;
  padding: 4px 6px; margin-top: 4px;
  border: 1px solid var(--g4); background: var(--blanc); color: var(--noir);
  outline: none; position: relative; z-index: 2;
}
.upload-legende:focus { border-color: var(--noir); }
.upload-legende::placeholder { color: var(--g4); }
.extra-header { display: flex; gap: 4px; width: 100%; flex-shrink: 0; margin-bottom: 4px; }
.extra-type-sel { font-family: var(--mono); font-size: 10px; flex: 1; padding: 3px 5px; border: 1px solid var(--g4); outline: none; background: var(--blanc); border-radius: 0; -webkit-appearance: none; }
.extra-type-sel:focus { border-color: var(--noir); }
.extra-type-txt { font-family: var(--mono); font-size: 10px; width: 100%; padding: 3px 5px; border: 1px solid var(--g4); outline: none; flex-shrink: 0; display: none; margin-bottom: 4px; }
.extra-remove { background: none; border: none; cursor: pointer; color: var(--g4); font-size: 14px; line-height: 1; padding: 0 2px; flex-shrink: 0; }
.extra-remove:hover { color: var(--rouge); }
.extra-file-zone { position: relative; width: 100%; flex: 1; min-height: 40px; cursor: pointer; display: flex; align-items: center; justify-content: center; }
.extra-file-zone input[type="file"] { position: absolute; inset: 0; opacity: 0; cursor: pointer; width: 100%; height: 100%; border: none; padding: 0; }
.upload-add-row { margin-top: 8px; }
.upload-add-btn { font-family: var(--mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; background: none; border: 1px dashed var(--g4); cursor: pointer; color: var(--g3); padding: 8px 16px; width: 100%; transition: color .1s, border-color .1s; }
.upload-add-btn:hover { color: var(--rouge); border-color: var(--rouge); }

/* ── NAVIGATION BOUTONS ── */
.form-footer {
  padding: 1.25rem 2rem;
  border-top: var(--b);
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: var(--blanc);
  position: sticky;
  bottom: 0;
}
.btn {
  font-family: var(--mono); font-size: 10px; letter-spacing: .1em;
  text-transform: uppercase; padding: 10px 20px;
  border: var(--b); background: none; cursor: pointer;
  color: var(--noir); transition: background .1s;
}
.btn:hover { background: var(--g5); }
.btn:disabled { opacity: .35; cursor: default; }
.btn.primary { background: var(--noir); color: var(--blanc); border-color: var(--noir); }
.btn.primary:hover { background: var(--g1); }
.btn.primary:disabled { background: var(--g4); border-color: var(--g4); cursor: default; }

.progress-bar {
  flex: 1; height: 2px; background: var(--g5);
  margin: 0 1.5rem; position: relative;
}
.progress-fill {
  height: 100%; background: var(--rouge);
  transition: width .3s ease;
  width: 20%;
}

/* ── RÉCAPITULATIF ── */
.recap-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.recap-section { margin-bottom: 1.25rem; }
.recap-label {
  font-size: 8px; letter-spacing: .14em; text-transform: uppercase;
  color: var(--rouge); margin-bottom: .5rem; display: block;
  border-bottom: 1px solid var(--g5); padding-bottom: .25rem; font-weight: 500;
}
.recap-row {
  display: flex; justify-content: space-between;
  padding: 4px 0; border-bottom: 1px solid var(--g5);
  font-size: 11px; gap: 10px;
}
.recap-row:last-child { border: none; }
.recap-k { color: var(--g3); flex-shrink: 0; }
.recap-v { font-weight: 500; text-align: right; }
.recap-planches { display: flex; gap: 6px; flex-wrap: wrap; margin-top: .35rem; }
.recap-pl-badge {
  font-size: 9px; padding: 2px 7px; border: 1px solid var(--vert);
  color: var(--vert); letter-spacing: .04em;
}

/* ── SUCCÈS ── */
.success-screen {
  display: none;
  padding: 4rem 2rem;
  text-align: center;
  max-width: 560px;
  margin: 0 auto;
}
.success-screen.show { display: block; }
.success-icon { font-size: 48px; margin-bottom: 1.5rem; }
.success-title { font-family: var(--serif); font-size: 32px; font-weight: 400; margin-bottom: .75rem; }
.success-title em { font-style: italic; color: var(--vert); }
.success-msg { font-size: 12px; color: var(--g2); line-height: 1.7; margin-bottom: 2rem; }
.success-ref {
  font-size: 11px; color: var(--g3); border: var(--bl);
  padding: .6rem 1rem; display: inline-block; margin-bottom: 2rem;
}
.success-ref strong { color: var(--noir); }

/* ── RESPONSIVE ── */
@media (max-width: 860px) {
  .form-layout { grid-template-columns: 160px 1fr; }
}

@media (max-width: 680px) {
  .form-layout { grid-template-columns: 1fr; }
  .form-nav { display: none; }

  .page-head { grid-template-columns: 1fr; gap: .5rem; padding: 1.25rem 1rem 1rem; }
  .page-title { font-size: 26px; }
  .step-indicator { text-align: left; }
  .step-indicator strong { display: inline; font-size: 16px; margin-right: .2rem; }

  .form-section { padding: 1.25rem 1rem 1.5rem; }
  .field-grid, .field-grid.three { grid-template-columns: 1fr; }
  .field.span2, .field.span3 { grid-column: span 1; }

  .upload-grid { grid-template-columns: repeat(2, 1fr); }
  .recap-grid { grid-template-columns: 1fr; }
  .form-footer { padding: .75rem 1rem; }
}

@media (max-width: 400px) {
  .upload-grid { grid-template-columns: 1fr; }
  .site-header { padding: 0 1rem; }
  .btn { padding: 10px 14px; }
}