/* ============================================
   BWM — Business World Model
   Palette: bleu nuit institutionnel + rouge et bleu
   drapeau en accents précis, blanc cassé pour l'espace.
   ============================================ */

:root {
  --ink:        #0A1128;   /* bleu nuit, quasi-noir : fond dominant, autorité */
  --ink-soft:   #141B33;
  --paper:      #F6F5F0;   /* blanc cassé, papier de dossier */
  --paper-dim:  #EAE8DF;
  --blue-flag:  #0F2A5C;   /* bleu drapeau français, précis, pas criard */
  --blue-line:  #2C4A87;
  --red-flag:   #B91C2E;   /* rouge drapeau, utilisé en accent rare */
  --red-line:   #8f1522;
  --text-dark:  #1B2035;
  --text-mute:  #4A5170;
  --text-on-dark: #E8E7E0;
  --text-on-dark-mute: #9BA3C4;

  --serif: 'Fraunces', Georgia, serif;
  --sans: 'Source Sans 3', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --mono: 'Roboto Mono', 'Courier New', monospace;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--sans);
  color: var(--text-dark);
  background: var(--paper);
  -webkit-font-smoothing: antialiased;
  line-height: 1.55;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 32px;
}

a { color: inherit; }

/* Signature element: a thin tricolor thread at the very top of the page,
   the one deliberate flag reference, understated, running the full width. */
.flag-thread {
  height: 4px;
  width: 100%;
  background: linear-gradient(90deg,
    var(--blue-flag) 0%, var(--blue-flag) 33.3%,
    #ffffff 33.3%, #ffffff 66.6%,
    var(--red-flag) 66.6%, var(--red-flag) 100%);
}

/* ---------- Header ---------- */
.site-header {
  background: var(--ink);
  border-bottom: 1px solid rgba(255,255,255,0.08);
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-top: 20px;
  padding-bottom: 20px;
}
.mark {
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.mark-letters {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.5rem;
  letter-spacing: 0.02em;
  color: var(--text-on-dark);
}
.mark-full {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--text-on-dark-mute);
  text-transform: uppercase;
}
.header-nav {
  display: flex;
  gap: 32px;
}
.header-nav a {
  text-decoration: none;
  color: var(--text-on-dark-mute);
  font-size: 0.92rem;
  transition: color 0.15s ease;
}
.header-nav a:hover { color: var(--text-on-dark); }

@media (max-width: 640px) {
  .mark-full { display: none; }
  .header-nav { gap: 18px; }
  .header-nav a { font-size: 0.82rem; }
}

/* ---------- Hero ---------- */
.hero {
  background: var(--ink);
  color: var(--text-on-dark);
  padding: 88px 0 96px;
}
.hero-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 64px;
  align-items: center;
}
.eyebrow {
  font-family: var(--mono);
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--red-flag);
  margin: 0 0 20px;
}
.hero-copy h1 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(2.1rem, 4vw, 3.1rem);
  line-height: 1.12;
  margin: 0 0 24px;
  color: #FFFFFF;
}
.hero-lead {
  font-size: 1.1rem;
  color: var(--text-on-dark-mute);
  max-width: 46ch;
  margin: 0 0 36px;
}
.hero-actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 2px;
  font-size: 0.95rem;
  font-weight: 600;
  text-decoration: none;
  transition: transform 0.15s ease, background 0.15s ease, border-color 0.15s ease;
}
.btn-primary {
  background: var(--red-flag);
  color: #fff;
  border: 1px solid var(--red-flag);
}
.btn-primary:hover { background: var(--red-line); }
.btn-ghost {
  background: transparent;
  color: var(--text-on-dark);
  border: 1px solid rgba(255,255,255,0.28);
}
.btn-ghost:hover { border-color: rgba(255,255,255,0.55); }

/* Hero diagram: the signature element.
   Two columns, cloud vs on-site, built from CSS boxes not stock art. */
.hero-diagram {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  align-items: start;
}
.diagram-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.diagram-label {
  font-family: var(--mono);
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--text-on-dark-mute);
  text-align: center;
}
.diagram-box {
  border-radius: 3px;
  padding: 18px 14px;
  text-align: center;
  display: flex;
  flex-direction: column;
  gap: 6px;
}
.cloud-box {
  background: rgba(255,255,255,0.05);
  border: 1px dashed rgba(255,255,255,0.28);
}
.box-title {
  font-family: var(--serif);
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-on-dark);
}
.box-sub {
  font-size: 0.74rem;
  color: var(--text-on-dark-mute);
  line-height: 1.4;
}
.diagram-arrow {
  text-align: center;
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--text-on-dark-mute);
  padding: 2px 0;
}
.you-box.faded {
  background: rgba(255,255,255,0.03);
  border: 1px solid rgba(255,255,255,0.1);
  opacity: 0.55;
}
.you-box-solid {
  background: var(--blue-flag);
  border: 1px solid var(--blue-line);
  padding: 22px 16px 20px;
}
.you-box-solid .box-title { color: #fff; }
.diagram-server {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin-top: 4px;
}
.server-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #4ADE80;
  box-shadow: 0 0 0 3px rgba(74, 222, 128, 0.18);
  flex: none;
}
.diagram-wall {
  text-align: center;
  font-family: var(--mono);
  font-size: 0.66rem;
  color: var(--red-flag);
  border-top: 1px solid rgba(185, 28, 46, 0.35);
  padding-top: 10px;
  margin-top: 2px;
}

@media (max-width: 860px) {
  .hero { padding: 56px 0 64px; }
  .hero-grid { grid-template-columns: 1fr; gap: 44px; }
}

/* ---------- Generic sections ---------- */
.section { padding: 84px 0; }
.section-alt { background: var(--paper-dim); }
.section-eyebrow {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--blue-flag);
  margin: 0 0 16px;
}
.section h2 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  line-height: 1.25;
  max-width: 22ch;
  margin: 0 0 52px;
  color: var(--text-dark);
}

/* Principle grid */
.principle-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 40px;
}
.principle-item {
  border-top: 2px solid var(--blue-flag);
  padding-top: 18px;
}
.principle-num {
  display: block;
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--red-flag);
  margin-bottom: 12px;
}
.principle-item p {
  color: var(--text-mute);
  font-size: 0.97rem;
  margin: 0;
}

@media (max-width: 780px) {
  .principle-grid { grid-template-columns: 1fr; gap: 32px; }
}

/* Client list — a dossier-style row layout, not cards */
.client-list {
  display: flex;
  flex-direction: column;
}
.client-row {
  padding: 28px 0;
  border-bottom: 1px solid rgba(15, 42, 92, 0.14);
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
}
.client-row:first-child { border-top: 1px solid rgba(15, 42, 92, 0.14); }
.client-row h3 {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.2rem;
  margin: 0;
  color: var(--text-dark);
}
.client-row p {
  margin: 0;
  color: var(--text-mute);
  max-width: 62ch;
}

@media (max-width: 720px) {
  .client-row { grid-template-columns: 1fr; gap: 10px; }
}

/* Steps */
.steps {
  display: flex;
  flex-direction: column;
  gap: 0;
}
.step {
  display: grid;
  grid-template-columns: 56px 1fr;
  gap: 24px;
  padding: 26px 0;
  border-bottom: 1px solid rgba(15, 42, 92, 0.12);
}
.step:first-child { border-top: 1px solid rgba(15, 42, 92, 0.12); }
.step-index {
  font-family: var(--serif);
  font-size: 1.6rem;
  font-weight: 600;
  color: var(--blue-flag);
  line-height: 1;
}
.step h3 {
  font-family: var(--sans);
  font-weight: 700;
  font-size: 1.02rem;
  margin: 0 0 8px;
  color: var(--text-dark);
}
.step p {
  margin: 0;
  color: var(--text-mute);
  max-width: 58ch;
}

/* ---------- Contact / dark closing section ---------- */
.section-dark {
  background: var(--ink);
  color: var(--text-on-dark);
}
.contact-wrap { text-align: center; }
.section-eyebrow-light { color: var(--red-flag); }
.section-dark h2 {
  color: #fff;
  max-width: none;
  margin: 0 0 20px;
}
.contact-lead {
  color: var(--text-on-dark-mute);
  max-width: 56ch;
  margin: 0 auto 36px;
}
.contact-email {
  display: inline-block;
  font-family: var(--serif);
  font-size: clamp(1.3rem, 3vw, 1.7rem);
  font-weight: 600;
  color: #fff;
  text-decoration: none;
  border-bottom: 2px solid var(--red-flag);
  padding-bottom: 4px;
  transition: border-color 0.15s ease, color 0.15s ease;
}
.contact-email:hover { border-color: #fff; }

/* ---------- Footer ---------- */
.site-footer {
  background: var(--ink);
  border-top: 1px solid rgba(255,255,255,0.08);
  padding: 22px 0 28px;
}
.footer-inner {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  font-family: var(--mono);
  font-size: 0.7rem;
  letter-spacing: 0.02em;
  color: var(--text-on-dark-mute);
  text-transform: uppercase;
}

/* ---------- Accessibility ---------- */
a:focus-visible, .btn:focus-visible {
  outline: 2px solid var(--red-flag);
  outline-offset: 3px;
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}