/* ==========================================================================
   Alexander Karpushov — Architecte Conseil
   Direction : calque de relevé technique — encre noire sur blanc, sans
   couleur d'accent (le gris des paragraphes fait office d'accent). Deux
   polices : JetBrains Mono pour tous les titres et liens, Source Serif 4
   pour les paragraphes. Un seul composant de section (« entries ») répété
   sur toutes les pages pour une structure homogène. Mise en page pleine
   largeur.
   ========================================================================== */

:root {
  --bg: #FFFFFF;
  --bg-soft: #F6F7F8;
  --ink: #101114;
  --ink-soft: #5B5E66;
  --line: #DEDFE3;
  --line-strong: #B7B9BF;
  --accent: #5B5E66;

  --font-body: "Source Serif 4", "Iowan Old Style", serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", monospace;

  --max-width: none;
  --gutter: clamp(1.25rem, 4vw, 3.75rem);
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

body {
  margin: 0;
  background-color: var(--bg);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.wrap {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter);
}

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

.label {
  font-family: var(--font-mono);
  font-weight: 400;
  font-size: 1rem;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--ink);
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--ink);
  color: var(--bg);
  padding: 0.7rem 1.1rem;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  z-index: 100;
}
.skip-link:focus { left: 0.5rem; top: 0.5rem; }

/* --- Header -------------------------------------------------------------- */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--bg);
  border-bottom: 1px solid var(--line);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  padding-top: 1.1rem;
  padding-bottom: 1.1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.9rem;
  flex-shrink: 0;
}

.brand-mark {
  width: 40px;
  height: 40px;
  flex: none;
  border: 1px solid var(--ink);
  position: relative;
}
.brand-mark svg { width: 100%; height: 100%; display: block; }

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}

.brand-name {
  font-family: var(--font-mono);
  font-size: 0.92rem;
  font-weight: 700;
  white-space: nowrap;
}

.brand-role {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent);
  margin-top: 0.25rem;
  white-space: nowrap;
}

/* Desktop nav */
.main-nav {
  flex-shrink: 0;
}

.main-nav ul {
  list-style: none;
  display: flex;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
}

.main-nav a {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  padding: 0.5rem 0.75rem;
  border: 1px solid transparent;
  white-space: nowrap;
}

.main-nav a:hover { color: var(--accent); }

.main-nav a[aria-current="page"] {
  border-color: var(--ink);
  color: var(--ink);
}

.nav-toggle {
  display: none;
  width: 40px;
  height: 40px;
  border: 1px solid var(--ink);
  background: none;
  cursor: pointer;
  align-items: center;
  justify-content: center;
  flex: none;
}

.nav-toggle .bars {
  position: relative;
  width: 18px;
  height: 12px;
}
.nav-toggle .bars span {
  position: absolute;
  left: 0;
  width: 100%;
  height: 1px;
  background: var(--ink);
  transition: transform 0.25s ease, opacity 0.25s ease, top 0.25s ease;
}
.nav-toggle .bars span:nth-child(1) { top: 0; }
.nav-toggle .bars span:nth-child(2) { top: 50%; }
.nav-toggle .bars span:nth-child(3) { top: 100%; }

body.nav-open .nav-toggle .bars span:nth-child(1) { top: 50%; transform: rotate(45deg); }
body.nav-open .nav-toggle .bars span:nth-child(2) { opacity: 0; }
body.nav-open .nav-toggle .bars span:nth-child(3) { top: 50%; transform: rotate(-45deg); }

/* --- Hero ------------------------------------------------------------ */

.hero {
  border-bottom: 1px solid var(--line);
}

.hero-image {
  width: 100%;
  height: clamp(320px, 60vw, 620px);
  object-fit: cover;
  display: block;
}

/* --- Page intro : identique en tête de chaque page, juste avant la
   liste à entrées qu'elle introduit. -------------------------------- */

.page-intro {
  padding: clamp(2.75rem, 7vw, 4.5rem) var(--gutter) clamp(1.75rem, 4vw, 2.5rem);
  max-width: var(--max-width);
  margin: 0 auto;
}

.page-intro .label { display: block; margin: 0 0 1.1rem; }

.page-intro .lede {
  font-size: 1.05rem;
  color: var(--ink-soft);
  margin: 0;
  text-align: justify;
  text-justify: inter-word;
  hyphens: none;
}

/* --- Entries : composant unique pour toutes les listes à accordéon
   (domaines d'intervention, prestations, parcours, coordonnées). ------ */

.entries {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(2.5rem, 6vw, 4rem);
  border-top: 1px solid var(--line);
}

.entry { border-bottom: 1px solid var(--line); }
.entry-static { border-bottom: none; }

.entry .row {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 0;
  padding: 1.25rem 0;
  background: none;
  border: none;
  cursor: pointer;
  text-align: left;
  font-family: inherit;
  color: inherit;
}

.entry > h2 { margin: 0; }

.entry-static .row { cursor: default; }

.entry .code {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent);
  flex: none;
  width: 2.3rem;
}

.entry .title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  flex: none;
}

.entry .leader {
  flex: 1;
  height: 0;
  border-bottom: 1px dotted var(--line-strong);
  margin: 0 0.4rem;
}

.entry .plus {
  flex: none;
  width: 22px;
  height: 22px;
  position: relative;
}
.entry .plus::before,
.entry .plus::after {
  content: "";
  position: absolute;
  background: var(--ink);
  top: 50%; left: 50%;
}
.entry .plus::before { width: 12px; height: 1px; transform: translate(-50%, -50%); }
.entry .plus::after { width: 1px; height: 12px; transform: translate(-50%, -50%); transition: transform 0.25s ease; }
.entry .row[aria-expanded="true"] .plus::after { transform: translate(-50%, -50%) rotate(90deg); }

.entry .panel {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.35s ease;
}
.entry .panel.open { grid-template-rows: 1fr; }
.entry .panel-inner { overflow: hidden; min-height: 0; }

.entry .panel-body {
  padding: 0 0 1.6rem calc(2.3rem + 1rem);
}
.entry-static .panel-body {
  padding-left: 0;
}
.entry .panel-body p {
  margin: 0 0 1.1rem;
  color: var(--ink-soft);
  text-align: justify;
  text-justify: inter-word;
  hyphens: none;
}
.entry .panel-body p:last-child { margin-bottom: 0; }

.entry .panel-body ul { margin: 0; padding: 0; list-style: none; }
.entry .panel-body li { margin-bottom: 0.5rem; font-size: 0.98rem; color: var(--ink-soft); }
.entry .panel-body li:last-child { margin-bottom: 0; }

.entry .panel-body dl { margin: 0; }
.entry .panel-body dt {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
  margin-top: 1.1rem;
}
.entry .panel-body dt:first-child { margin-top: 0; }
.entry .panel-body dd { margin: 0.3rem 0 0; font-size: 1rem; color: var(--ink); }
.entry .panel-body dd a:hover { color: var(--accent); }

/* --- Contact band -------------------------------------------------------- */

.contact-band {
  background: var(--bg-soft);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding: clamp(3rem, 7vw, 4.5rem) var(--gutter);
  margin-top: clamp(2.5rem, 6vw, 4rem);
}

.contact-band .wrap {
  max-width: var(--max-width);
  padding: 0;
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  gap: 2rem;
  flex-wrap: wrap;
}

.contact-band h2 {
  font-family: var(--font-mono);
  font-weight: 700;
  letter-spacing: -0.01em;
  font-size: clamp(1.3rem, 2.4vw, 1.7rem);
  margin: 0.5rem 0 0;
  max-width: 24ch;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid var(--ink);
  padding: 0.9rem 1.5rem;
  background: none;
  cursor: pointer;
  transition: background 0.2s ease, color 0.2s ease, border-color 0.2s ease;
  white-space: nowrap;
}

.btn:hover { background: var(--ink); color: var(--bg); }

.btn-arrow { transition: transform 0.2s ease; }
.btn:hover .btn-arrow { transform: translateX(3px); }

/* --- Formulaire de contact ------------------------------------------------ */

.form-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 var(--gutter) clamp(3.5rem, 8vw, 5.5rem);
}

.form-section .label { display: block; margin: 0 0 1.4rem; }

.contact-form {
  display: grid;
  gap: 1.3rem;
}
.field { display: grid; gap: 0.5rem; }
.field label {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--ink-soft);
}
.field input,
.field textarea,
.field select {
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--ink);
  background: transparent;
  border: none;
  border-bottom: 1px solid var(--line-strong);
  border-radius: 0;
  padding: 0.6rem 0.1rem;
  resize: vertical;
  -webkit-appearance: none;
  appearance: none;
}
.field select {
  background-image: linear-gradient(45deg, transparent 50%, var(--ink-soft) 50%), linear-gradient(135deg, var(--ink-soft) 50%, transparent 50%);
  background-position: right 0.3rem top 55%, right 0.6rem top 55%;
  background-size: 6px 6px, 6px 6px;
  background-repeat: no-repeat;
  padding-right: 1.4rem;
}
.field select:invalid { color: var(--ink-soft); }
.field input:focus, .field textarea:focus, .field select:focus { border-bottom-color: var(--accent); }

.contact-form .btn { justify-self: start; margin-top: 0.4rem; }

/* --- Footer -------------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--line);
  padding: 1.6rem var(--gutter) 2rem;
}
.site-footer .wrap {
  padding: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
}
.site-footer .label {
  color: var(--ink-soft);
  font-size: 0.7rem;
  font-weight: 400;
  letter-spacing: 0.06em;
  text-transform: none;
}
.site-footer .stamp { color: var(--ink-soft); }

/* --- Reveal-on-scroll (generic) ------------------------------------------ */

[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
[data-reveal].in-view {
  opacity: 1;
  transform: translateY(0);
}

/* --- Responsive ---------------------------------------------------------- */

@media (max-width: 680px) {
  .nav-toggle { display: inline-flex; }

  .main-nav {
    position: fixed;
    inset: 0;
    top: 65px;
    background: var(--bg);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.2s ease, transform 0.2s ease;
  }
  body.nav-open .main-nav {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .main-nav ul {
    flex-direction: column;
    gap: 0;
    padding: 1rem var(--gutter);
  }
  .main-nav a {
    padding: 1rem 0;
    border-bottom: 1px solid var(--line);
    font-size: 0.95rem;
  }
  .main-nav a[aria-current="page"] { border-color: var(--line); border-bottom-color: var(--accent); }

  .entry .leader { display: none; }
}