:root {
  --orange: #ED7D31;
  --orange-dark: #C9621D;
  --orange-light: #FBE5D2;
  --ink: #1A1A1A;
  --ink-soft: #2D2D2D;
  --text: #333333;
  --text-soft: #666666;
  --line: #E5E5E5;
  --bg: #FFFFFF;
  --bg-alt: #FAF7F4;
  --bg-dark: #1A1A1A;
  --shadow-sm: 0 1px 2px rgba(0,0,0,.05);
  --shadow-md: 0 4px 16px rgba(0,0,0,.06);
  --shadow-lg: 0 12px 40px rgba(0,0,0,.10);
  --radius: 10px;
  --radius-lg: 14px;
  --max: 1200px;
  --t: 240ms cubic-bezier(.4,0,.2,1);
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  font-family: 'Segoe UI', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
}

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

h1, h2, h3 { color: var(--ink); line-height: 1.2; margin: 0 0 .4em; }
h1 { font-size: clamp(2rem, 5vw, 3.4rem); font-weight: 800; letter-spacing: -.02em; }
h2 { font-size: clamp(1.6rem, 3.6vw, 2.4rem); font-weight: 800; letter-spacing: -.015em; }
h3 { font-size: 1.2rem; font-weight: 700; }
p  { margin: 0 0 1em; }

/* === NAV === */
.nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(255,255,255,.92);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-bottom: 1px solid transparent;
  transition: border-color var(--t), box-shadow var(--t);
}
.nav.scrolled { border-bottom-color: var(--line); box-shadow: var(--shadow-sm); }
.nav-inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 14px 24px;
  display: flex; align-items: center; justify-content: space-between;
  gap: 24px;
}
.nav-logo img { height: 36px; width: auto; }
.nav-links {
  display: flex; align-items: center; gap: 28px;
  font-size: .95rem; font-weight: 500;
}
.nav-links a { color: var(--text); transition: color var(--t); }
.nav-links a:hover { color: var(--orange); }
.nav-cta {
  background: var(--orange); color: #fff !important;
  padding: 10px 18px; border-radius: 999px;
  font-weight: 600; font-size: .9rem;
  transition: background var(--t), transform var(--t);
}
.nav-cta:hover { background: var(--orange-dark); transform: translateY(-1px); }
.nav-toggle {
  display: none;
  background: none; border: 0; padding: 8px;
  cursor: pointer; flex-direction: column; gap: 5px;
}
.nav-toggle span {
  width: 24px; height: 2px; background: var(--ink); border-radius: 2px;
  transition: transform var(--t), opacity var(--t);
}
.nav-toggle[aria-expanded="true"] span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

@media (max-width: 860px) {
  .nav-toggle { display: flex; }
  .nav-links {
    position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 0;
    background: #fff; border-bottom: 1px solid var(--line);
    padding: 8px 24px 20px;
    transform: translateY(-10px); opacity: 0; pointer-events: none;
    transition: opacity var(--t), transform var(--t);
  }
  .nav-links.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
  .nav-links a { padding: 14px 0; border-bottom: 1px solid var(--line); }
  .nav-links a:last-child { border-bottom: 0; }
  .nav-cta { text-align: center; margin-top: 10px; }
}

/* === HERO === */
.hero {
  position: relative;
  background: var(--bg-dark);
  color: #fff;
  overflow: hidden;
  padding: 100px 24px 120px;
}
.hero-bg {
  position: absolute; inset: 0;
  background:
    radial-gradient(ellipse at 80% 10%, rgba(237,125,49,.20), transparent 55%),
    radial-gradient(ellipse at 10% 90%, rgba(237,125,49,.10), transparent 50%),
    linear-gradient(180deg, #1F1F1F, #141414);
  z-index: 0;
}
.hero-bg::after {
  content: ""; position: absolute; inset: 0;
  background-image:
    linear-gradient(rgba(255,255,255,.04) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255,255,255,.04) 1px, transparent 1px);
  background-size: 60px 60px;
  mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000 30%, transparent 75%);
}
.hero-inner {
  position: relative; z-index: 1;
  max-width: 900px; margin: 0 auto; text-align: center;
}
.hero-mark { margin: 0 auto 24px; opacity: .9; }
.hero h1 { color: #fff; }
.hero-accent { color: var(--orange); }
.hero-sub {
  font-size: clamp(1rem, 1.6vw, 1.15rem);
  color: rgba(255,255,255,.78);
  max-width: 680px; margin: 0 auto 32px;
}
.hero-cta {
  display: flex; flex-wrap: wrap; gap: 12px; justify-content: center;
  margin-bottom: 40px;
}
.hero-tags {
  display: flex; flex-wrap: wrap; gap: 8px; justify-content: center;
  font-size: .82rem;
}
.hero-tags span {
  border: 1px solid rgba(255,255,255,.2);
  border-radius: 999px;
  padding: 6px 14px;
  color: rgba(255,255,255,.7);
}

/* === BUTTONS === */
.btn {
  display: inline-block;
  padding: 13px 26px;
  border-radius: 999px;
  font-weight: 600; font-size: .95rem;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background var(--t), transform var(--t), border-color var(--t), color var(--t);
}
.btn-primary { background: var(--orange); color: #fff; }
.btn-primary:hover { background: var(--orange-dark); transform: translateY(-1px); }
.btn-ghost { background: transparent; color: #fff; border-color: rgba(255,255,255,.3); }
.btn-ghost:hover { border-color: #fff; }
.btn-block { width: 100%; padding: 15px 26px; }

/* === SECTION === */
.section { padding: 96px 24px; }
.section-alt { background: var(--bg-alt); }
.section-dark { background: var(--bg-dark); color: #fff; }
.section-dark h2 { color: #fff; }
.section-inner { max-width: var(--max); margin: 0 auto; }
.section-head { max-width: 760px; margin: 0 auto 56px; text-align: center; }
.eyebrow {
  display: inline-block;
  font-size: .78rem; font-weight: 700; letter-spacing: 2px;
  text-transform: uppercase; color: var(--orange);
  margin-bottom: 14px;
}
.eyebrow-light { color: var(--orange); }
.section-lead { font-size: 1.05rem; color: var(--text-soft); }

/* === REVEAL === */
.reveal { opacity: 0; transform: translateY(24px); transition: opacity .6s ease, transform .6s ease; }
.reveal.visible { opacity: 1; transform: translateY(0); }

/* === SERVICES === */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 24px;
}
.card {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 28px;
  transition: transform var(--t), box-shadow var(--t), border-color var(--t);
}
.card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(237,125,49,.3);
}
.card-icon {
  width: 56px; height: 56px;
  border-radius: 12px;
  background: var(--orange-light);
  color: var(--orange);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 20px;
}
.card-icon svg { width: 28px; height: 28px; }
.card h3 { margin-bottom: 10px; }
.card p { color: var(--text-soft); font-size: .95rem; margin-bottom: 14px; }
.card-list { margin: 0; padding: 0; list-style: none; }
.card-list li {
  font-size: .88rem; color: var(--text);
  padding: 6px 0 6px 22px; position: relative;
  border-top: 1px solid var(--line);
}
.card-list li:first-child { border-top: 0; }
.card-list li::before {
  content: ""; position: absolute; left: 4px; top: 50%;
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--orange); transform: translateY(-50%);
}

/* === WHY === */
.why-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 32px;
}
.why-item { padding: 8px; }
.why-num {
  font-size: 1.6rem; font-weight: 800;
  color: var(--orange); letter-spacing: -.02em;
  margin-bottom: 12px;
  display: inline-block;
  border-bottom: 3px solid var(--orange);
  padding-bottom: 4px;
}
.why-item h3 { margin-bottom: 8px; }
.why-item p { color: var(--text-soft); font-size: .95rem; }

/* === STEPS === */
.steps {
  list-style: none;
  padding: 0; margin: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  counter-reset: step;
}
.step {
  position: relative;
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  padding: 32px 28px 28px;
  transition: transform var(--t), box-shadow var(--t);
}
.step:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); }
.step-num {
  position: absolute; top: -18px; left: 24px;
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--orange); color: #fff;
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 1.1rem;
  box-shadow: 0 4px 12px rgba(237,125,49,.4);
}
.step h3 { margin-top: 8px; margin-bottom: 8px; }
.step p { color: var(--text-soft); font-size: .92rem; margin: 0; }

/* === PROJECTS === */
.projects {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
}
.project {
  background: #fff;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: transform var(--t), box-shadow var(--t);
}
.project:hover { transform: translateY(-4px); box-shadow: var(--shadow-lg); }
.project-cover {
  height: 180px;
  position: relative;
  display: flex; align-items: flex-end;
  padding: 16px;
  background: linear-gradient(135deg, #2A2A2A, #1A1A1A);
  overflow: hidden;
}
.project-cover::before {
  content: "";
  position: absolute; inset: 0;
  opacity: .35;
  background-image:
    linear-gradient(rgba(237,125,49,.4) 1px, transparent 1px),
    linear-gradient(90deg, rgba(237,125,49,.4) 1px, transparent 1px);
  background-size: 28px 28px;
  mask-image: radial-gradient(ellipse at center, #000, transparent 80%);
  -webkit-mask-image: radial-gradient(ellipse at center, #000, transparent 80%);
}
.project-cover[data-type="logement"]::after { content: "🏢"; }
.project-cover[data-type="villa"]::after    { content: "🏡"; }
.project-cover[data-type="industriel"]::after{ content: "🏭"; }
.project-cover[data-type="audit"]::after    { content: "📐"; }
.project-cover::after {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -60%);
  font-size: 4rem;
  opacity: .4;
  filter: grayscale(.3);
}
.project-tag {
  position: relative; z-index: 1;
  display: inline-block;
  background: rgba(237,125,49,.95);
  color: #fff; font-size: .75rem; font-weight: 600;
  padding: 5px 12px; border-radius: 999px;
  letter-spacing: .5px; text-transform: uppercase;
}
.project-body { padding: 22px 24px 26px; }
.project-body h3 { margin-bottom: 8px; font-size: 1.1rem; }
.project-body p { color: var(--text-soft); font-size: .92rem; margin: 0; }

/* === CONTACT === */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}
@media (max-width: 860px) {
  .contact-grid { grid-template-columns: 1fr; gap: 40px; }
}
.contact-text h2 { color: #fff; }
.contact-text > p { color: rgba(255,255,255,.78); font-size: 1.05rem; margin-bottom: 32px; }
.contact-info { display: flex; flex-direction: column; gap: 16px; }
.contact-row {
  display: flex; align-items: center; gap: 14px;
  color: rgba(255,255,255,.85);
  padding: 14px 18px;
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius);
  transition: background var(--t), border-color var(--t);
}
a.contact-row:hover { background: rgba(255,255,255,.08); border-color: rgba(237,125,49,.5); }

.contact-form {
  background: #fff;
  color: var(--text);
  border-radius: var(--radius-lg);
  padding: 36px 32px;
  box-shadow: var(--shadow-lg);
}
.contact-form h3 { margin-bottom: 20px; font-size: 1.3rem; }
.contact-form label {
  display: block; margin-bottom: 16px;
}
.contact-form span {
  display: block; font-size: .85rem; font-weight: 600;
  color: var(--ink); margin-bottom: 6px;
}
.contact-form input,
.contact-form select,
.contact-form textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font: inherit;
  font-size: .95rem;
  background: #fff;
  color: var(--text);
  transition: border-color var(--t), box-shadow var(--t);
}
.contact-form input:focus,
.contact-form select:focus,
.contact-form textarea:focus {
  outline: none;
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(237,125,49,.15);
}
.contact-form textarea { resize: vertical; min-height: 100px; }
.form-note {
  font-size: .78rem; color: var(--text-soft);
  margin: 12px 0 0; text-align: center;
}
.form-status {
  font-size: .88rem;
  margin: 12px 0 0;
  text-align: center;
  min-height: 1.2em;
}
.form-status.is-error { color: #C62828; }
.form-status.is-success { color: #2E7D32; }
button[disabled] { opacity: .65; cursor: not-allowed; }

.form-success {
  background: #fff;
  color: var(--text);
  border-radius: var(--radius-lg);
  padding: 48px 32px;
  box-shadow: var(--shadow-lg);
  text-align: center;
}
.form-success-icon {
  width: 64px; height: 64px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: var(--orange-light);
  color: var(--orange);
  display: flex; align-items: center; justify-content: center;
}
.form-success-icon svg { width: 32px; height: 32px; }
.form-success h3 { font-size: 1.4rem; margin-bottom: 8px; }
.form-success p { color: var(--text-soft); margin: 0; }

/* === FOOTER === */
.footer {
  background: #0F0F0F;
  color: rgba(255,255,255,.6);
  padding: 48px 24px 32px;
  font-size: .9rem;
}
.footer-inner {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 1.5fr 1fr 1fr;
  gap: 32px; align-items: start;
}
@media (max-width: 760px) {
  .footer-inner { grid-template-columns: 1fr; gap: 24px; }
}
.footer-brand img { filter: brightness(1.1); margin-bottom: 12px; }
.footer-brand p { margin: 0; color: rgba(255,255,255,.5); font-size: .85rem; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a { color: rgba(255,255,255,.7); transition: color var(--t); }
.footer-links a:hover { color: var(--orange); }
.footer-meta {
  text-align: right;
  color: rgba(255,255,255,.4); font-size: .82rem;
}
@media (max-width: 760px) { .footer-meta { text-align: left; } }

/* === RESPONSIVE TWEAKS === */
@media (max-width: 600px) {
  .hero { padding: 64px 20px 80px; }
  .section { padding: 64px 20px; }
  .section-head { margin-bottom: 40px; }
  .contact-form { padding: 28px 22px; }
}