/* ============================================================
   NEXUS — faire le lien.
   Design system : éditorial institutionnel
   Encre noire / bleu nuit (bannière) / fond papier
   Libre Bodoni (titres) · Public Sans (texte)
   ============================================================ */

:root {
  /* Couleurs */
  --paper: #FAF9F6;
  --paper-deep: #F1EFE9;
  --ink: #0B0B0E;
  --ink-soft: #3A3A40;
  --muted: #62626B;
  --line: #E2E0D8;
  --navy-950: #04071A;
  --navy-900: #0A1240;
  --navy-700: #17246E;
  --blue: #2136B8;          /* bleu bannière */
  --blue-bright: #8B9AF5;   /* bleu lisible sur fond sombre */
  --white: #FFFFFF;
  --white-70: rgba(255, 255, 255, 0.72);
  --white-40: rgba(255, 255, 255, 0.4);
  --white-15: rgba(255, 255, 255, 0.15);

  /* Typographie */
  --font-display: "Libre Bodoni", Georgia, serif;
  --font-body: "Public Sans", -apple-system, "Segoe UI", sans-serif;

  /* Espacements */
  --space-section: clamp(5rem, 10vw, 8.5rem);
  --container: 72rem;

  /* Mouvements */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
}

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

html { scroll-behavior: smooth; }

body {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.65;
  color: var(--ink);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
}

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

a { color: inherit; }

ul, ol { list-style: none; }

button { font: inherit; cursor: pointer; background: none; border: none; }

::selection { background: var(--navy-700); color: var(--white); }

.container {
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: clamp(1.25rem, 5vw, 2.5rem);
}

/* ---------- Accessibilité ---------- */
.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 100;
  padding: 0.75rem 1.25rem;
  background: var(--ink);
  color: var(--white);
  text-decoration: none;
  font-weight: 600;
}
.skip-link:focus { top: 1rem; }

:focus-visible {
  outline: 3px solid var(--blue);
  outline-offset: 3px;
}
.hero :focus-visible,
.contact :focus-visible {
  outline-color: var(--blue-bright);
}

/* ---------- Typographie commune ---------- */
h1, h2, h3 { font-family: var(--font-display); font-weight: 500; line-height: 1.08; }

h1 { font-size: clamp(3.25rem, 9vw, 6.5rem); letter-spacing: -0.01em; }
h2 { font-size: clamp(2rem, 4.5vw, 3.25rem); letter-spacing: -0.005em; }
h2 em { font-style: italic; }

.eyebrow {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 1.25rem;
  display: flex;
  align-items: center;
  gap: 0.875rem;
}
.eyebrow::before {
  content: "";
  width: 2.25rem;
  height: 1px;
  background: currentColor;
  opacity: 0.6;
}
.eyebrow-light { color: var(--white-70); }

.lead { font-size: 1.1875rem; line-height: 1.7; }

/* ---------- Boutons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.75rem;
  font-size: 0.9375rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-decoration: none;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.btn-light { background: var(--white); color: var(--navy-950); }
.btn-light:hover { background: var(--paper-deep); }

.btn-ghost { border-color: var(--white-40); color: var(--white); }
.btn-ghost:hover { border-color: var(--white); background: var(--white-15); }

.btn-outline { border-color: var(--ink); color: var(--ink); }
.btn-outline:hover { background: var(--ink); color: var(--white); }

/* ============================================================
   HEADER
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: color-mix(in srgb, var(--paper) 88%, transparent);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  height: 4.5rem;
}

.brand { display: flex; align-items: baseline; gap: 0.625rem; text-decoration: none; }
.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.375rem;
  letter-spacing: 0.04em;
}
.brand-tagline {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 0.875rem;
  color: var(--muted);
}

.main-nav ul { display: flex; gap: 2.25rem; }
.main-nav a {
  text-decoration: none;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--ink-soft);
  padding: 0.5rem 0;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.main-nav a:hover,
.main-nav a[aria-current="true"] { color: var(--ink); border-bottom-color: var(--ink); }

.header-cta { min-height: 2.5rem; padding: 0.5rem 1.25rem; font-size: 0.875rem; }

/* Burger */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  width: 44px;
  height: 44px;
  padding: 10px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.nav-toggle[aria-expanded="true"] span:first-child { transform: translateY(4px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:last-child { transform: translateY(-4px) rotate(-45deg); }

.mobile-nav { display: none; border-top: 1px solid var(--line); }
.mobile-nav.open { display: block; }
.mobile-nav ul { padding: 0.5rem 0 1rem; }
.mobile-nav a {
  display: block;
  padding: 0.875rem clamp(1.25rem, 5vw, 2.5rem);
  text-decoration: none;
  font-size: 1.0625rem;
  font-weight: 500;
}
.mobile-nav a:hover { background: var(--paper-deep); }

@media (max-width: 860px) {
  .main-nav, .header-cta { display: none; }
  .nav-toggle { display: flex; }
}

/* ============================================================
   HERO — dégradé bleu nuit de la bannière
   ============================================================ */
.hero {
  position: relative;
  min-height: calc(100svh - 4.5rem);
  display: flex;
  flex-direction: column;
  justify-content: center;
  color: var(--white);
  background:
    radial-gradient(115% 130% at 8% 0%, var(--blue) 0%, var(--navy-900) 42%, var(--navy-950) 78%);
  overflow: hidden;
}

/* trame fine, discrète */
.hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,0.035) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.hero-inner { position: relative; z-index: 1; padding-block: clamp(4rem, 10vh, 7rem) 3rem; }

.hero .eyebrow { color: var(--white-70); }

.hero h1 { max-width: 12ch; }

.hero-lead {
  max-width: 34rem;
  margin-top: 2rem;
  font-size: clamp(1.0625rem, 1.6vw, 1.25rem);
  font-weight: 300;
  line-height: 1.75;
  color: var(--white-70);
}

.hero-actions { display: flex; flex-wrap: wrap; gap: 1rem; margin-top: 2.75rem; }

.hero-footer {
  position: relative;
  z-index: 1;
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 2rem;
  padding-block: 1.5rem;
  border-top: 1px solid var(--white-15);
}

.hero-scroll {
  font-size: 0.6875rem;
  letter-spacing: 0.25em;
  text-transform: uppercase;
  color: var(--white-40);
  white-space: nowrap;
}

.hero-marks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 2.5rem;
  justify-content: flex-end;
}
.hero-marks li {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--white-70);
}

@media (max-width: 640px) {
  .hero-marks { display: none; }
}

/* ============================================================
   SECTIONS COMMUNES
   ============================================================ */
.section { padding-block: var(--space-section); }

.section-head { margin-bottom: clamp(3rem, 6vw, 4.5rem); }

/* ============================================================
   QUI SOMMES-NOUS
   ============================================================ */
.about { border-bottom: 1px solid var(--line); }

.about-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(2.5rem, 6vw, 5.5rem);
  align-items: start;
}

.about-text p + p { margin-top: 1.5rem; color: var(--muted); }

.method-list { border-top: 1px solid var(--line); }

.method-list li {
  display: grid;
  grid-template-columns: 4rem 1fr;
  gap: 1.25rem;
  padding-block: 1.75rem;
  border-bottom: 1px solid var(--line);
}

.method-num {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.375rem;
  color: var(--blue);
  line-height: 1.3;
}

.method-list h3 { font-size: 1.25rem; margin-bottom: 0.375rem; }
.method-list p { font-size: 0.9375rem; color: var(--muted); }

@media (max-width: 860px) {
  .about-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   EXPERTISES
   ============================================================ */
.expertises { background: var(--paper-deep); border-bottom: 1px solid var(--line); }
.expertises .eyebrow { color: var(--ink-soft); }

.expertise-list { border-top: 1px solid var(--ink); }

.expertise {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(1.5rem, 4vw, 4rem);
  padding-block: clamp(2.25rem, 4.5vw, 3.5rem);
  border-bottom: 1px solid var(--ink);
}

.expertise-head { display: flex; align-items: baseline; gap: 1.5rem; }

/* Liste interactive « quiet luxury » : le titre glisse, une flèche apparaît */
.expertise h3 { transition: transform 0.35s var(--ease); }
.expertise:hover h3 { transform: translateX(0.5rem); }

.expertise::after {
  content: "\2192";
  position: absolute;
  top: clamp(2.25rem, 4.5vw, 3.5rem);
  right: 0;
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.75rem;
  line-height: 1;
  color: var(--blue);
  opacity: 0;
  transform: translateX(-0.75rem);
  transition: opacity 0.35s var(--ease), transform 0.35s var(--ease);
  pointer-events: none;
}
.expertise:hover::after { opacity: 1; transform: none; }

.expertise-num {
  font-family: var(--font-display);
  font-style: italic;
  font-size: 1.125rem;
  color: var(--blue);
}

.expertise h3 { font-size: clamp(1.625rem, 3vw, 2.25rem); }

.expertise-body p { color: var(--ink-soft); max-width: 36rem; }

.expertise-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
  margin-top: 1.5rem;
}
.expertise-tags li {
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.03em;
  padding: 0.4375rem 0.9375rem;
  border: 1px solid var(--ink);
  border-radius: 999px;
  transition: background-color 0.25s var(--ease), color 0.25s var(--ease);
}
.expertise:hover .expertise-tags li { background: var(--ink); color: var(--paper); }

@media (max-width: 860px) {
  .expertise { grid-template-columns: 1fr; }
  .expertise:hover .expertise-tags li { background: transparent; color: inherit; }
}

/* ============================================================
   ÉQUIPE — panneaux extensibles au survol
   ============================================================ */
.team-expander {
  display: flex;
  gap: 0.5rem;
  height: clamp(24rem, 55vh, 29rem);
}

.team-panel {
  position: relative;
  overflow: hidden;
  flex: 1 1 0;
  min-width: 0;
  cursor: pointer;
  background:
    radial-gradient(120% 140% at 15% 0%, var(--navy-700) 0%, var(--navy-950) 75%);
  transition: flex-grow 0.6s var(--ease);
}
.team-panel.is-active { flex-grow: 6; cursor: default; }

.team-panel-media {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.team-panel-media span {
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(3rem, 6vw, 4.5rem);
  color: var(--white-40);
  transition: color 0.4s var(--ease), transform 0.5s var(--ease);
}
.team-panel.is-active .team-panel-media span {
  color: var(--white-70);
  transform: translateY(-2.5rem) scale(1.05);
}

/* Pattern « magazine » : portraits N&B, couleur révélée à l'ouverture
   (s'appliquera aux vraies photos ; le monogramme s'éclaire en attendant) */
.team-panel-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: grayscale(1);
  transition: filter 0.45s var(--ease), transform 0.6s var(--ease);
}
.team-panel.is-active .team-panel-media img { filter: grayscale(0); transform: scale(1.04); }

/* Prénom vertical sur les panneaux repliés */
.team-panel-tab {
  position: absolute;
  left: 50%;
  bottom: 1.5rem;
  transform: translateX(-50%);
  writing-mode: vertical-rl;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--white-40);
  white-space: nowrap;
  transition: opacity 0.3s var(--ease);
}
.team-panel.is-active .team-panel-tab { opacity: 0; }

/* Infos révélées dans le panneau ouvert */
.team-panel-info {
  position: absolute;
  inset: auto 0 0 0;
  padding: 3.5rem 1.75rem 1.625rem;
  background: linear-gradient(to top, rgba(4, 7, 26, 0.92) 30%, transparent);
  color: var(--white);
  opacity: 0;
  transform: translateY(0.75rem);
  transition: opacity 0.45s var(--ease), transform 0.45s var(--ease);
  pointer-events: none;
}
.team-panel.is-active .team-panel-info {
  opacity: 1;
  transform: none;
  transition-delay: 0.18s;
  pointer-events: auto;
}

.team-panel-info h3 { font-size: 1.375rem; }

.team-role {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--blue-bright);
  margin-top: 0.375rem;
}

.team-bio { font-size: 0.9063rem; color: var(--white-70); margin-top: 0.75rem; max-width: 32rem; }

/* Mobile : accordéon vertical */
@media (max-width: 860px) {
  .team-expander { flex-direction: column; height: 40rem; gap: 0.375rem; }
  .team-panel-tab {
    left: 1.25rem;
    bottom: auto;
    top: 50%;
    transform: translateY(-50%);
    writing-mode: horizontal-tb;
  }
  .team-panel-info { padding: 3rem 1.25rem 1.25rem; }
  .team-panel.is-active .team-panel-media span { transform: translateY(-3.5rem) scale(1.05); }
}

/* ============================================================
   CONTACT
   ============================================================ */
.contact {
  color: var(--white);
  background:
    radial-gradient(110% 140% at 92% 110%, var(--blue) 0%, var(--navy-900) 45%, var(--navy-950) 85%);
}

.contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  gap: clamp(3rem, 7vw, 6rem);
  align-items: start;
}

.contact-text { margin-top: 1.75rem; color: var(--white-70); max-width: 26rem; }

.contact-email {
  display: inline-block;
  margin-top: 2rem;
  font-family: var(--font-display);
  font-style: italic;
  font-size: clamp(1.25rem, 2.4vw, 1.625rem);
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid var(--white-40);
  padding-bottom: 0.25rem;
  transition: border-color 0.25s var(--ease);
}
.contact-email:hover { border-bottom-color: var(--white); }

.contact-studio {
  display: flex;
  gap: 0.875rem;
  align-items: flex-start;
  margin-top: 2.75rem;
  padding-top: 1.75rem;
  border-top: 1px solid var(--white-15);
  font-size: 0.9063rem;
  color: var(--white-70);
  max-width: 26rem;
}
.contact-studio svg { width: 1.375rem; height: 1.375rem; flex-shrink: 0; margin-top: 0.125rem; }

/* Formulaire */
.contact-form { display: grid; gap: 1.5rem; }

.form-field { display: grid; gap: 0.5rem; }

.form-field label {
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--white-70);
}

.form-field input,
.form-field select,
.form-field textarea {
  width: 100%;
  min-height: 3rem;
  padding: 0.75rem 1rem;
  font: inherit;
  color: var(--white);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid var(--white-15);
  border-radius: 0;
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.form-field textarea { resize: vertical; }

.form-field input:hover,
.form-field select:hover,
.form-field textarea:hover { border-color: var(--white-40); }

.form-field input:focus,
.form-field select:focus,
.form-field textarea:focus {
  outline: none;
  border-color: var(--white);
  background: rgba(255, 255, 255, 0.1);
}

.form-field select { appearance: none; cursor: pointer;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%23ffffff' stroke-width='2'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 1rem center;
  background-size: 1rem;
}
.form-field select option { color: var(--ink); background: var(--white); }

.form-field input.field-error,
.form-field select.field-error,
.form-field textarea.field-error { border-color: #F87171; }

.form-submit { justify-self: start; padding-inline: 2.5rem; }

.form-status { font-size: 0.9063rem; color: var(--white-70); min-height: 1.5em; }
.form-status.success { color: #86EFAC; }
.form-status.error { color: #FCA5A5; }

@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; }
}

/* ============================================================
   FOOTER
   ============================================================ */
.site-footer {
  background: var(--navy-950);
  color: var(--white-70);
  border-top: 1px solid var(--white-15);
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem 3rem;
  padding-block: 2.5rem;
}

.footer-brand { display: flex; align-items: baseline; gap: 0.625rem; color: var(--white); }
.footer-brand .brand-tagline { color: var(--white-40); }

.footer-nav { display: flex; flex-wrap: wrap; gap: 1.75rem; }
.footer-nav a {
  font-size: 0.875rem;
  text-decoration: none;
  color: var(--white-70);
  transition: color 0.2s var(--ease);
}
.footer-nav a:hover { color: var(--white); }

.footer-legal { font-size: 0.8125rem; color: var(--white-40); }
.footer-legal a { color: inherit; }

/* ============================================================
   RÉVÉLATION AU DÉFILEMENT
   ============================================================ */
.reveal {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s var(--ease), transform 0.7s var(--ease);
}
.reveal.visible { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  *, *::before, *::after { transition-duration: 0.01ms !important; animation-duration: 0.01ms !important; }
}