/* =========================================================
   Christopher Chau Advisory — feuille de style
   ========================================================= */

:root{
  --cream:      #F4F1ED;
  --gray-sec:   #DCD9D5;
  --dark:       #1A1A1A;
  --orange:     #E67E22;
  --orange-d:   #CB6E1A;
  --ink:        #201D1A;
  --ink-soft:   #4A453F;
  --border:     #C9C4BC;

  --font-serif: 'Playfair Display', Georgia, serif;
  --font-sans:  'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  --container-w: 1180px;
}

*{ box-sizing: border-box; }
html{ scroll-behavior: smooth; }
body{
  margin:0;
  font-family: var(--font-sans);
  color: var(--ink);
  background: var(--cream);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img{ max-width:100%; display:block; }
a{ color: inherit; text-decoration: none; }

.container{
  width:100%;
  max-width: var(--container-w);
  margin: 0 auto;
  padding: 0 24px;
}

h1,h2,h3{
  font-family: var(--font-serif);
  font-weight: 600;
  line-height: 1.15;
  margin: 0 0 20px;
  color: var(--ink);
}
h1{ font-size: clamp(2.4rem, 5vw, 3.6rem); }
h2{ font-size: clamp(1.9rem, 4vw, 2.6rem); }
h3{ font-size: 1.3rem; margin-bottom: 14px; }
p{ margin: 0 0 16px; color: var(--ink-soft); }

/* focus visibility */
a:focus-visible, button:focus-visible, input:focus-visible, textarea:focus-visible{
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce){
  *{ animation: none !important; transition: none !important; }
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;
  padding: 14px 28px;
  border-radius: 2px;
  font-weight: 600;
  font-size: 0.95rem;
  text-align:center;
  border: none;
  cursor: pointer;
  transition: background-color .2s ease, transform .15s ease;
}
.btn-primary{
  background: var(--orange);
  color: #fff;
}
.btn-primary:hover{
  background: var(--orange-d);
}
.btn-row{ display:flex; gap:16px; flex-wrap: wrap; }

/* ---------- Header ---------- */
.site-header{
  background: var(--cream);
  position: sticky;
  top:0;
  z-index: 50;
  border-bottom: 1px solid rgba(0,0,0,.06);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content: space-between;
  padding-top: 18px;
  padding-bottom: 18px;
}
.logo img{ height: 40px; width:auto; }
.main-nav{ display:flex; align-items:center; gap: 32px; }
.main-nav a{ font-size: .95rem; font-weight:500; }
.main-nav a.nav-cta{
  background: var(--orange);
  color:#fff;
  padding: 10px 20px;
  border-radius: 2px;
  font-weight:600;
}
.main-nav a.nav-cta:hover{ background: var(--orange-d); }

.nav-toggle{
  display:none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
}
.nav-toggle span{
  display:block;
  height: 2px;
  width: 100%;
  background: var(--ink);
}

/* ---------- Hero ---------- */
.hero{ padding: 64px 0 96px; }
.hero-grid{
  display:grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  align-items:center;
}
.hero-text{ text-align: center; }
.hero-text .lead{ font-size: 1.05rem; max-width: 46ch; margin-left: auto; margin-right: auto; }
.hero-text .btn-row{ justify-content: center; }
.hero-title{ text-align: center; margin-bottom: 20px; }
.hero-logo{ max-width: 420px; width: 100%; margin: 0 auto; }

@keyframes hero-title-in{
  from{ opacity: 0; transform: translateY(28px); }
  to{ opacity: 1; transform: translateY(0); }
}
.hero-text h1{
  animation: hero-title-in .9s cubic-bezier(.16,.8,.24,1) both;
}
.hero-image img{ border-radius: 2px; }

/* ---------- Approche holistique ---------- */
.approche{ padding: 40px 0 90px; }
.approche h2{ margin-bottom: 56px; }
.approche-row{
  display:grid;
  grid-template-columns: 0.8fr 1.2fr;
  gap: 64px;
  align-items:start;
}
.approche-image{ position: sticky; top: 110px; overflow: hidden; border-radius: 2px; }
.approche-image img{
  border-radius:2px;
  transform-origin: center center;
  transition: transform .1s ease-out;
  will-change: transform;
}
.approche-cta{
  display:flex;
  align-items:center;
  gap: 20px;
  flex-wrap: wrap;
  margin-top: 28px;
}
.approche-cta span{ color: var(--ink-soft); }

/* ---------- References / Projects ---------- */
.references{ background: var(--gray-sec); padding: 88px 0; }
.references h2{ margin-bottom: 12px; }
.section-intro{ margin-bottom: 48px; font-size: 1.05rem; }

.projects-grid{
  display:grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 48px 40px;
}
.project-card .project-image{
  aspect-ratio: 4/3;
  overflow:hidden;
  margin-bottom: 20px;
  border-radius: 2px;
}
.project-card .project-image img{
  width:100%; height:100%; object-fit: cover;
  transition: transform 1.4s ease;
  transform-origin: center center;
}
.project-card:hover .project-image img{
  transform: scale(1.05);
}
.project-meta{
  list-style:none;
  margin:0; padding:0;
  font-size: .95rem;
  color: var(--ink-soft);
}
.project-meta li{ margin-bottom: 4px; }
.project-meta strong{ color: var(--ink); }

/* ---------- Parcours Professionnel ---------- */
.parcours{ padding: 96px 0; }
.parcours-head{
  display:grid;
  grid-template-columns: 1.3fr 0.7fr;
  gap: 56px;
  align-items:start;
  margin-bottom: 56px;
}
.parcours-portrait{ max-width: 220px; }
.parcours-portrait img{ border-radius: 2px; }

.timeline{
  list-style:none;
  margin:0; padding:0;
  border-top: 1px solid var(--border);
}
.timeline li{
  display:grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  align-items:center;
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
}
.timeline-logo{
  max-height: 42px;
  width:auto;
  max-width: 200px;
  object-fit: contain;
}
.timeline p{ margin:0; color: var(--ink-soft); }
.timeline-date{ color: var(--ink); font-weight: 600; }

/* ---------- Contact ---------- */
.contact{ background: var(--dark); color:#fff; padding: 96px 0; }
.contact-grid{
  display:grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 64px;
}
.contact h2{ color:#fff; }
.contact-text p{ color: #C9C6C1; max-width: 42ch; margin-bottom: 32px; }

.form-row{ display:grid; grid-template-columns: 1fr 1fr; gap: 20px; }
.form-field{ margin-bottom: 22px; }
.form-field label{
  display:block;
  font-size: .9rem;
  margin-bottom: 8px;
  color: #E7E4DF;
}
.form-field input,
.form-field textarea{
  width:100%;
  background: transparent;
  border: 1px solid #4A4A4A;
  color: #fff;
  padding: 12px 14px;
  font-family: var(--font-sans);
  font-size: .95rem;
  border-radius: 2px;
}
.form-field input::placeholder,
.form-field textarea::placeholder{ color: #8A8A8A; }
.form-field textarea{ resize: vertical; }
.btn-submit{ width:100%; border:none; }
.form-status{ margin-top:14px; font-size:.9rem; color:#C9C6C1; min-height: 1.2em; }

/* ---------- Marquee ---------- */
.marquee{
  background: var(--gray-sec);
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  overflow: hidden;
  white-space: nowrap;
  padding: 18px 0;
}
.marquee-track{
  display:inline-flex;
  animation: marquee-scroll 28s linear infinite;
}
.marquee-track span{
  font-size: .9rem;
  letter-spacing: .02em;
  color: var(--ink-soft);
  padding-right: 4px;
}
@keyframes marquee-scroll{
  from{ transform: translateX(0); }
  to{ transform: translateX(-50%); }
}
@media (prefers-reduced-motion: reduce){
  .marquee-track{ animation: none; }
  .marquee{ overflow-x: auto; }
}

/* ---------- Footer ---------- */
.site-footer{ padding: 56px 0; background: var(--cream); }
.footer-inner{
  display:flex;
  align-items:center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 24px;
}
.footer-logo img{ height: 36px; }
.footer-contact{
  display:flex;
  align-items:center;
  gap: 22px;
  flex-wrap:wrap;
  font-size: .95rem;
}
.footer-social{ display:inline-flex; color: #0A66C2; }
.footer-copyright{
  width:100%;
  margin:0;
  color: var(--ink-soft);
  font-size: .88rem;
}

/* =========================================================
   Responsive
   ========================================================= */
@media (max-width: 900px){
  .hero-grid,
  .approche-row,
  .parcours-head,
  .contact-grid{
    grid-template-columns: 1fr;
  }
  .approche-image{ position: static; }
  .parcours-portrait{ max-width: 220px; margin: 0 auto; }
  .logo img{ height: 30px; }

  .projects-grid{ grid-template-columns: repeat(2, 1fr); }

  .main-nav{
    position:absolute;
    top: 100%;
    left:0; right:0;
    background: var(--cream);
    flex-direction: column;
    align-items: flex-start;
    padding: 20px 24px 28px;
    gap: 18px;
    border-bottom: 1px solid rgba(0,0,0,.08);
    display:none;
  }
  .main-nav.open{ display:flex; }
  .nav-toggle{ display:flex; }
}

@media (max-width: 640px){
  .projects-grid{ grid-template-columns: 1fr; }
  h1{ text-align:center; }
  .hero-text{ text-align:center; }
  .hero-text .lead{ margin-left:auto; margin-right:auto; }
  .btn-row{ justify-content:center; }

  .timeline li{
    grid-template-columns: 1fr;
    text-align:left;
    gap: 12px;
  }
  .timeline-logo{ max-height: 34px; }

  .form-row{ grid-template-columns: 1fr; }
}