/* ==========================================================================
   LDMT Consult — Stylesheet
   Palette : Bleu LDMT #1B2A4A · Or LDMT #8C6239 · Fond blanc
   ========================================================================== */

:root {
  --color-primary: #1B2A4A;
  --color-primary-light: #2c4269;
  --color-accent: #8C6239;
  --color-accent-light: #a97e52;
  --color-bg: #FFFFFF;
  --color-bg-alt: #F7F5F1;
  --color-text: #1B2A4A;
  --color-text-secondary: #5A6478;
  --color-border: #E4E1DA;
  --font-serif: 'Source Serif 4', Georgia, serif;
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --max-width: 1140px;
  --header-height: 76px;
  --radius: 6px;
  --transition: 0.25s ease;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { animation-duration: 0.001ms !important; animation-iteration-count: 1 !important; transition-duration: 0.001ms !important; scroll-behavior: auto !important; }
}

body {
  margin: 0;
  font-family: var(--font-sans);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.2;
  margin: 0 0 0.5em;
  color: var(--color-primary);
}

h1 { font-size: clamp(2rem, 4.5vw, 3.4rem); font-weight: 500; }
h2 { font-size: clamp(1.6rem, 3vw, 2.3rem); }
p { margin: 0 0 1em; color: var(--color-text-secondary); }
a { color: var(--color-primary); }

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 20px;
  z-index: 1000;
  border-radius: 0 0 var(--radius) 0;
}
.skip-link:focus {
  left: 0;
}

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

.section-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.eyebrow {
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75em;
}

.section-intro {
  max-width: 640px;
  font-size: 1.05rem;
}

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

.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(255, 255, 255, 0.88);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition), box-shadow var(--transition), padding var(--transition);
}

.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 2px 16px rgba(27, 42, 74, 0.05);
}

.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  height: var(--header-height);
}

.logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.logo-mark { display: block; height: 32px; width: auto; }
.logo-word {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--color-primary);
  white-space: nowrap;
}

.nav-desktop ul {
  list-style: none;
  display: flex;
  gap: 28px;
  margin: 0;
  padding: 0;
}
.nav-desktop a {
  text-decoration: none;
  color: var(--color-text);
  font-size: 0.95rem;
  font-weight: 500;
  position: relative;
  padding-bottom: 4px;
}
.nav-desktop a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  background: var(--color-accent);
  transform: scaleX(0);
  transition: transform var(--transition);
}
.nav-desktop a:hover::after,
.nav-desktop a:focus-visible::after { transform: scaleX(1); }

.header-actions {
  display: flex;
  align-items: center;
  gap: 18px;
}

.lang-switch {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
}
.lang-btn {
  background: none;
  border: none;
  cursor: pointer;
  font: inherit;
  font-weight: 600;
  color: var(--color-text-secondary);
  padding: 4px 2px;
}
.lang-btn[aria-pressed="true"] { color: var(--color-primary); }
.lang-btn:hover { color: var(--color-accent); }

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform var(--transition), opacity var(--transition);
}
.menu-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.menu-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.nav-mobile {
  display: none;
  max-height: 0;
  overflow: hidden;
  transition: max-height var(--transition);
  border-top: 1px solid var(--color-border);
  background: var(--color-bg);
}
.nav-mobile.open { max-height: 480px; }
.nav-mobile ul {
  list-style: none;
  margin: 0;
  padding: 12px 24px 20px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}
.nav-mobile a {
  display: block;
  padding: 12px 0;
  text-decoration: none;
  color: var(--color-text);
  font-weight: 500;
  border-bottom: 1px solid var(--color-border);
}

/* ---------- Buttons ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 13px 26px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  cursor: pointer;
  border: 1px solid transparent;
  transition: background var(--transition), color var(--transition), border-color var(--transition), transform var(--transition);
}
.btn:hover { transform: translateY(-1px); }

.btn-primary {
  background: var(--color-primary);
  color: #fff;
}
.btn-primary:hover { background: var(--color-primary-light); }

.btn-ghost {
  background: transparent;
  color: var(--color-primary);
  border-color: var(--color-border);
}
.btn-ghost:hover { border-color: var(--color-accent); color: var(--color-accent); }

.btn-small { padding: 9px 18px; font-size: 0.85rem; }

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

.hero { padding: 96px 0 100px; }
.hero-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items: center;
}
.hero-subtitle { font-size: 1.15rem; max-width: 46ch; }
.hero-ctas { display: flex; gap: 14px; flex-wrap: wrap; margin-top: 28px; }
.hero-visual { display: flex; justify-content: center; }
.hero-logo { width: 100%; max-width: 480px; opacity: 0.95; }

/* ---------- Sections ---------- */

.section { padding: 88px 0; }
.section-alt { background: var(--color-bg-alt); }

.grid { display: grid; gap: 28px; margin-top: 40px; }
.grid-3 {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  grid-template-columns: unset;
}
.grid-3 > .card {
  flex: 1 1 300px;
  max-width: 340px;
}

.card {
  min-height: 260px;
  perspective: 1200px;
  cursor: pointer;
  outline: none;
}
.card:focus-visible .flip-card-face {
  outline: 2px solid var(--color-accent);
  outline-offset: 2px;
}

.flip-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  min-height: 260px;
  transition: transform 0.7s cubic-bezier(0.4, 0.2, 0.2, 1);
  transform-style: preserve-3d;
}
.card.is-flipped .flip-card-inner { transform: rotateY(180deg); }

.flip-card-face {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  backface-visibility: hidden;
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 28px;
  transition: border-color var(--transition), box-shadow var(--transition);
}
.card:hover .flip-card-face {
  border-color: var(--color-accent-light);
  box-shadow: 0 8px 24px rgba(27, 42, 74, 0.07);
}

.flip-card-back {
  transform: rotateY(180deg);
  justify-content: center;
}
.flip-card-back p { font-size: 0.95rem; margin: 0; color: var(--color-text); }

.card h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: 10px;
}
.card .card-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-text-secondary);
  margin-bottom: 8px;
}
.card .card-problems {
  font-size: 0.9rem;
  color: var(--color-accent);
  margin: 0;
  padding-top: 12px;
  border-top: 1px solid var(--color-border);
}

.approach-list {
  display: grid;
  gap: 24px;
  margin-top: 32px;
}
.approach-item {
  display: grid;
  grid-template-columns: 40px 1fr;
  gap: 18px;
  padding: 22px 0;
  border-bottom: 1px solid var(--color-border);
}
.approach-item:last-child { border-bottom: none; }
.approach-number {
  font-family: var(--font-serif);
  font-size: 1.3rem;
  color: var(--color-accent);
}
.approach-item h3 {
  font-family: var(--font-sans);
  font-size: 1.05rem;
  color: var(--color-primary);
  margin-bottom: 6px;
}
.approach-item p { margin: 0; font-size: 0.97rem; }

.method-steps {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 20px;
  counter-reset: step;
}
.method-step {
  flex: 1 1 190px;
  max-width: 220px;
  padding: 24px 18px;
  border-top: 3px solid var(--color-accent);
  background: var(--color-bg-alt);
  border-radius: 0 0 var(--radius) var(--radius);
}
.method-step-index {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  color: var(--color-accent);
  display: block;
  margin-bottom: 8px;
}
.method-step h3 {
  font-family: var(--font-sans);
  font-size: 1rem;
  margin-bottom: 8px;
  color: var(--color-primary);
}
.method-step p { font-size: 0.9rem; margin: 0; }

.about-inner {
  display: grid;
  grid-template-columns: 1.4fr 0.7fr;
  gap: 56px;
  align-items: start;
}
.about-paragraphs p { font-size: 1rem; }
.about-card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
}
.about-photo {
  width: 128px;
  height: 128px;
  border-radius: 50%;
  object-fit: cover;
  object-position: center 15%;
  margin-bottom: 18px;
  border: 3px solid var(--color-bg-alt);
  box-shadow: 0 2px 10px rgba(27, 42, 74, 0.12);
}
.about-name {
  font-family: var(--font-serif);
  font-size: 1.2rem;
  color: var(--color-primary);
  margin-bottom: 4px;
}
.about-role { font-size: 0.9rem; margin: 0 0 14px; }
.about-meta {
  font-size: 0.78rem;
  color: var(--color-text-secondary);
  margin: 0;
  padding-top: 14px;
  border-top: 1px solid var(--color-border);
}

/* ---------- CTA ---------- */

.cta-section {
  background: var(--color-primary);
  padding: 76px 0;
}
.cta-inner { text-align: center; max-width: 640px; margin: 0 auto; }
.cta-inner h2 { color: #fff; }
.cta-inner p { color: rgba(255,255,255,0.75); font-size: 1.1rem; margin-bottom: 28px; }
.cta-inner .btn-primary { background: var(--color-accent); }
.cta-inner .btn-primary:hover { background: var(--color-accent-light); }

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

.contact-inner {
  display: grid;
  grid-template-columns: 0.9fr 1.1fr;
  gap: 56px;
}
.contact-details {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}
.contact-details li {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--color-border);
  font-size: 0.97rem;
}
.contact-label {
  display: block;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-accent);
  margin-bottom: 3px;
}
.contact-details a { text-decoration: none; }
.contact-details a:hover { color: var(--color-accent); }

.contact-form {
  background: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  padding: 32px;
}
.form-row { margin-bottom: 18px; }
.form-row label {
  display: block;
  font-size: 0.85rem;
  font-weight: 600;
  margin-bottom: 6px;
  color: var(--color-primary);
}
.form-row input,
.form-row textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  font: inherit;
  color: var(--color-text);
  background: #fff;
  transition: border-color var(--transition);
}
.form-row input:focus,
.form-row textarea:focus {
  border-color: var(--color-accent);
  outline: none;
}
.form-confirmation {
  margin: 16px 0 0;
  padding: 12px 14px;
  background: rgba(140, 98, 57, 0.12);
  border-radius: var(--radius);
  color: var(--color-primary);
  font-size: 0.9rem;
}
.form-confirmation.form-error {
  background: rgba(178, 58, 58, 0.12);
  color: #8a2626;
}
#formSubmit:disabled { opacity: 0.6; cursor: wait; }

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

.site-footer {
  background: var(--color-primary);
  color: rgba(255,255,255,0.7);
  padding: 48px 0;
  font-size: 0.85rem;
}
.footer-inner { text-align: center; }
.footer-brand {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font-family: var(--font-serif);
  color: #fff;
  font-size: 1.05rem;
  margin-bottom: 10px;
}
.footer-tagline { font-style: italic; color: rgba(255,255,255,0.55); margin-bottom: 14px; }
.footer-meta { margin-bottom: 8px; }
.footer-legal a { color: rgba(255,255,255,0.6); text-decoration: none; margin: 0; }
.footer-legal a:hover { color: #fff; }

/* ---------- Reveal animation ---------- */

.reveal {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.reveal.is-visible {
  opacity: 1;
  transform: translateY(0);
}

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

@media (max-width: 960px) {
  .hero-inner { grid-template-columns: 1fr; }
  .hero-visual { order: -1; }
  .hero-logo { max-width: 140px; }
  .about-inner { grid-template-columns: 1fr; }
  .about-card { max-width: 340px; }
  .contact-inner { grid-template-columns: 1fr; }
}

@media (max-width: 720px) {
  .nav-desktop { display: none; }
  .menu-toggle { display: flex; }
  .nav-mobile { display: block; }
  .header-inner { padding: 14px 20px; }
  .logo-word { font-size: 1rem; }
  .section { padding: 64px 0; }
  .hero { padding: 64px 0 72px; }
  .approach-item { grid-template-columns: 32px 1fr; }
  h1 { font-size: 2rem; }
}

@media (max-width: 480px) {
  .method-step { flex-basis: 100%; max-width: 100%; }
  .card { flex-basis: 100%; max-width: 100%; }
  .hero-ctas { flex-direction: column; align-items: stretch; }
  .header-actions { gap: 12px; }
}