/* ============================================================
   ARCA STUDIO — style.css
   Styles partagés entre toutes les pages
   ============================================================ */

/* --- Google Fonts --- */
@import url('https://fonts.googleapis.com/css2?family=Bricolage+Grotesque:wght@400;500;600;700;800&family=DM+Sans:wght@300;400;500;600&display=swap');

/* --- CSS Variables --- */
:root {
  --cream:     #FFFFFF;
  --sand:      #EAE5DC;
  --copper:    #C8531C;
  --copper-dk: #A84215;
  --dark:      #1C1B19;
  --brown:     #211E1A;
  --stone:     #7A7060;

  --nav-height: 72px;
  --font-heading: 'Bricolage Grotesque', system-ui, sans-serif;
  --font-body:    'DM Sans', system-ui, sans-serif;
}

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

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-body);
  background-color: var(--cream);
  color: var(--dark);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
  animation: pageIn 0.35s ease forwards;
}

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

a {
  color: inherit;
  text-decoration: none;
}

button {
  cursor: pointer;
  font-family: var(--font-body);
  border: none;
  background: none;
}

ul, ol {
  list-style: none;
}

/* --- Page fade-in animation --- */
@keyframes pageIn {
  from {
    opacity: 0;
    transform: translateY(8px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* --- Reveal on scroll --- */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

.reveal.d1 { transition-delay: 0.10s; }
.reveal.d2 { transition-delay: 0.20s; }
.reveal.d3 { transition-delay: 0.32s; }
.reveal.d4 { transition-delay: 0.44s; }

/* ============================================================
   NAVIGATION
   ============================================================ */

#arca-nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 2.5rem;
  transition: background 0.3s ease, box-shadow 0.3s ease, backdrop-filter 0.3s ease;
}

#arca-nav.scrolled {
  background: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  box-shadow: 0 1px 0 rgba(28, 27, 25, 0.08);
}

.nav-logo {
  font-family: var(--font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.18em;
  color: var(--dark);
  text-decoration: none;
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2.2rem;
  margin-left: auto;
  margin-right: 2rem;
}

/* Nav link with animated copper underline */
.nav-link {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--dark);
  position: relative;
  padding-bottom: 3px;
  transition: color 0.2s ease;
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 1px;
  background-color: var(--copper);
  transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.nav-link:hover,
.nav-link.active {
  color: var(--copper);
}

/* CTA button in nav */
.nav-cta {
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--cream);
  background: var(--dark);
  padding: 0.55rem 1.35rem;
  border-radius: 100px;
  transition: background 0.2s ease;
  white-space: nowrap;
}

.nav-cta:hover {
  background: var(--copper);
}

/* --- Burger button --- */
.burger {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  width: 36px;
  height: 36px;
  gap: 6px;
  cursor: pointer;
  margin-left: auto;
  z-index: 1100;
}

.burger span {
  display: block;
  width: 26px;
  height: 1.5px;
  background: var(--dark);
  transition: all 0.3s ease;
  transform-origin: center;
}

.burger.open span:nth-child(1) {
  transform: translateY(7.5px) rotate(45deg);
}

.burger.open span:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.burger.open span:nth-child(3) {
  transform: translateY(-7.5px) rotate(-45deg);
}

/* --- Mobile menu overlay --- */
#mobile-menu {
  position: fixed;
  inset: 0;
  background: var(--cream);
  z-index: 1050;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 0.25rem;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

#mobile-menu.open {
  opacity: 1;
  pointer-events: all;
}

.mobile-nav-link {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 7vw, 3rem);
  font-weight: 600;
  color: var(--dark);
  letter-spacing: 0.04em;
  padding: 0.35rem 1rem;
  transition: color 0.2s ease, transform 0.2s ease;
  transform: translateY(20px);
  opacity: 0;
}

#mobile-menu.open .mobile-nav-link {
  animation: mobileItemIn 0.4s ease forwards;
}

#mobile-menu.open .mobile-nav-link:nth-child(1) { animation-delay: 0.05s; }
#mobile-menu.open .mobile-nav-link:nth-child(2) { animation-delay: 0.10s; }
#mobile-menu.open .mobile-nav-link:nth-child(3) { animation-delay: 0.15s; }
#mobile-menu.open .mobile-nav-link:nth-child(4) { animation-delay: 0.20s; }
#mobile-menu.open .mobile-nav-link:nth-child(5) { animation-delay: 0.25s; }
#mobile-menu.open .mobile-nav-link:nth-child(6) { animation-delay: 0.30s; }

@keyframes mobileItemIn {
  to {
    transform: translateY(0);
    opacity: 1;
  }
}

.mobile-nav-link:hover {
  color: var(--copper);
}

.mobile-cta-link {
  margin-top: 1.5rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream);
  background: var(--dark);
  padding: 0.75rem 2rem;
  border-radius: 100px;
  transition: background 0.2s ease;
  opacity: 0;
}

#mobile-menu.open .mobile-cta-link {
  animation: mobileItemIn 0.4s ease 0.35s forwards;
}

.mobile-cta-link:hover {
  background: var(--copper);
}

/* ============================================================
   BUTTONS
   ============================================================ */

.btn-copper {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream);
  background: var(--copper);
  padding: 0.8rem 2rem;
  border-radius: 100px;
  transition: background 0.2s ease, transform 0.15s ease;
  cursor: pointer;
}

.btn-copper:hover {
  background: var(--copper-dk);
  transform: translateY(-1px);
}

.btn-dark {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream);
  background: var(--dark);
  padding: 0.8rem 2rem;
  border-radius: 100px;
  transition: background 0.2s ease, transform 0.15s ease;
}

.btn-dark:hover {
  background: var(--copper);
  transform: translateY(-1px);
}

.btn-outline {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cream);
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.45);
  padding: 0.8rem 2rem;
  border-radius: 100px;
  transition: border-color 0.2s ease, background 0.2s ease, transform 0.15s ease;
}

.btn-outline:hover {
  border-color: var(--cream);
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-1px);
}

/* ============================================================
   UTILITY / TYPOGRAPHY
   ============================================================ */

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--copper);
}

.copper-rule {
  display: block;
  width: 36px;
  height: 1px;
  background: var(--copper);
  margin: 1rem 0;
}

.photo-wrap {
  overflow: hidden;
  position: relative;
}

.photo-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s ease;
}

.photo-wrap:hover img {
  transform: scale(1.04);
}

.stat-num {
  font-family: var(--font-heading);
  font-size: clamp(2.8rem, 5vw, 4.5rem);
  font-weight: 700;
  color: var(--dark);
  line-height: 1;
}

.footer-link {
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.55);
  transition: color 0.2s ease;
}

.footer-link:hover {
  color: var(--copper);
}

.footer-label {
  font-size: 0.6875rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.35);
  margin-bottom: 1rem;
}

/* ============================================================
   LAYOUT HELPERS
   ============================================================ */

.section {
  padding: 80px 2.5rem;
}

.section-full {
  padding: 80px 0;
}

.page-header {
  padding-top: 140px;
  padding-bottom: 70px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2.5rem;
}

.divider {
  border: none;
  border-top: 1px solid rgba(28, 27, 25, 0.08);
}

/* ============================================================
   FAQ ACCORDION
   ============================================================ */

.accordion-item {
  border-bottom: 1px solid rgba(28, 27, 25, 0.10);
}

.accordion-btn {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 1.5rem 0;
  text-align: left;
  cursor: pointer;
  background: none;
  border: none;
  font-family: var(--font-heading);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--dark);
  transition: color 0.2s ease;
}

.accordion-btn:hover {
  color: var(--copper);
}

.accordion-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  font-size: 1.4rem;
  color: var(--copper);
  transition: transform 0.3s ease;
  line-height: 1;
}

.accordion-btn.open .accordion-icon {
  transform: rotate(45deg);
}

.accordion-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.accordion-inner {
  padding-bottom: 1.5rem;
  font-size: 0.9375rem;
  color: var(--stone);
  line-height: 1.75;
}

/* ============================================================
   FOOTER
   ============================================================ */

#site-footer {
  background: var(--brown);
  color: var(--cream);
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 3rem;
  padding: 5rem 2.5rem 3rem;
  max-width: 1200px;
  margin: 0 auto;
}

.footer-brand-logo {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--cream);
}

.footer-tagline {
  font-size: 0.85rem;
  color: rgba(255, 255, 255, 0.45);
  margin-top: 0.6rem;
  line-height: 1.6;
  max-width: 220px;
}

.footer-social {
  display: flex;
  gap: 1rem;
  margin-top: 1.5rem;
}

.footer-social a {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.4);
  transition: color 0.2s ease;
}

.footer-social a:hover {
  color: var(--copper);
}

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  padding: 1.5rem 2.5rem;
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.footer-copy {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.25);
}

.footer-credit a {
  font-size: 0.75rem;
  color: rgba(255, 255, 255, 0.25);
  transition: color 0.2s ease;
}

.footer-credit a:hover {
  color: var(--copper);
}

/* ============================================================
   CONTACT FORM
   ============================================================ */

.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.form-label {
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--stone);
}

.form-input,
.form-select,
.form-textarea {
  font-family: var(--font-body);
  font-size: 0.9375rem;
  color: var(--dark);
  background: transparent;
  border: none;
  border-bottom: 1px solid rgba(28, 27, 25, 0.25);
  padding: 0.7rem 0;
  width: 100%;
  outline: none;
  transition: border-color 0.2s ease;
  -webkit-appearance: none;
  appearance: none;
}

.form-input:focus,
.form-select:focus,
.form-textarea:focus {
  border-bottom-color: var(--copper);
}

.form-input::placeholder,
.form-textarea::placeholder {
  color: rgba(28, 27, 25, 0.35);
}

.form-textarea {
  resize: vertical;
  min-height: 120px;
}

.form-select {
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%237A7060' stroke-width='1.5' fill='none'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right 0.5rem center;
  cursor: pointer;
}

.form-success {
  display: none;
  padding: 1rem 1.5rem;
  background: rgba(181, 137, 90, 0.12);
  border: 1px solid rgba(181, 137, 90, 0.3);
  border-radius: 8px;
  color: var(--copper-dk);
  font-size: 0.9rem;
  line-height: 1.6;
}

.form-success.show {
  display: block;
}

/* ============================================================
   RESPONSIVE
   ============================================================ */

@media (max-width: 1024px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 2.5rem;
  }
}

@media (max-width: 768px) {
  :root {
    --nav-height: 64px;
  }

  .section {
    padding: 60px 1.25rem;
  }

  .section-full {
    padding: 60px 0;
  }

  .page-header {
    padding-top: 110px;
    padding-bottom: 50px;
  }

  .container {
    padding: 0 1.25rem;
  }

  /* Hide desktop nav links, show burger */
  .nav-links,
  .nav-cta {
    display: none;
  }

  .burger {
    display: flex;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 2rem;
    padding: 3.5rem 1.25rem 2rem;
  }

  .footer-bottom {
    padding: 1.25rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
  }

  .stat-num {
    font-size: 2.5rem;
  }
}

@media (max-width: 480px) {
  #arca-nav {
    padding: 0 1.25rem;
  }
}

/* ============================================================
   STACKED / LAYERED SECTIONS
   ============================================================ */

.layer-stack {
  border-radius: 40px 40px 0 0;
  margin-top: -40px;
  position: relative;
}

/* ============================================================
   PARALLAX HELPERS
   ============================================================ */

.plx-wrap {
  overflow: hidden;
  position: relative;
}

.plx {
  will-change: transform;
}

/* ============================================================
   ORGANIC CARDS
   ============================================================ */

.card-round {
  border-radius: 20px;
  overflow: hidden;
}

.card-round-xl {
  border-radius: 28px;
  overflow: hidden;
}

/* Service cards on homepage */
.svc-card {
  background: var(--cream);
  border-radius: 20px;
  padding: 2.25rem;
  transition: box-shadow 0.3s ease, transform 0.3s ease;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  border: 1px solid rgba(28, 27, 25, 0.06);
}

.svc-card:hover {
  box-shadow: 0 20px 60px rgba(28, 27, 25, 0.10);
  transform: translateY(-4px);
}

@media (max-width: 900px) {
  .layer-stack {
    border-radius: 28px 28px 0 0;
    margin-top: -28px;
  }
}