/* ============================================
   SPRINT 3D — Design System Vanilla CSS
   Stack : HTML5 / Vanilla CSS / Vanilla JS
   Dark Mode natif · Inter font · Clean & Tech
   ============================================ */
:root {
    --color-bg: #222528; /* Deep slate background */
    --color-text: #f3f4f6;
    --color-text-muted: #abb2bf;
    --color-primary: #269A96; /* Requested Teal */
    --color-primary-hover: #1f7d79;
    --color-surface: #3C4146; /* Requested Slate for cards/surfaces */
    --color-border: #4f555b;
    --font-main: 'Inter', system-ui, -apple-system, sans-serif;
    --spacing-xs: 0.5rem;
    --spacing-sm: 1rem;
    --spacing-md: 2rem;
    --spacing-lg: 2.5rem; /* Reduced from 4rem */
    --spacing-xl: 4.5rem; /* Reduced from 8rem */
    --radius-sm: 4px;
    --radius-md: 8px;
    --radius-lg: 16px;
    --transition-fast: 0.2s ease;
    --transition-base: 0.3s ease;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-main);
    line-height: 1.6;
    margin: 0;
    padding: 0;
    -webkit-font-smoothing: antialiased;
    overflow-x: hidden;
}

* { box-sizing: border-box; }

h1, h2, h3, h4, h5, h6 { margin: 0 0 var(--spacing-sm); font-weight: 700; line-height: 1.2; }
a { color: var(--color-primary); text-decoration: none; transition: color var(--transition-fast); cursor: pointer; }
a:hover { color: var(--color-primary-hover); }

.container { max-width: 1350px; margin: 0 auto; padding: 0 var(--spacing-sm); width: 100%; }
.text-center { text-align: center; }
.accent { color: var(--color-primary); }

.btn {
    display: inline-flex; align-items: center; justify-content: center;
    padding: 0.75rem 1.5rem; background-color: var(--color-primary);
    color: #fff; border-radius: var(--radius-md); font-weight: 600;
    border: none; cursor: pointer; transition: background-color var(--transition-base), transform var(--transition-fast);
}
.btn:hover { background-color: var(--color-primary-hover); transform: translateY(-2px); color: #fff; }
.btn-outline { background-color: transparent; border: 2px solid var(--color-primary); color: #fff; }
.btn-outline:hover { background-color: var(--color-primary); color: #fff; }

/* Header */
.site-header {
    background-color: rgba(60, 65, 70, 0.9); backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--color-border); position: sticky; top: 0; z-index: 100;
}
.header-inner { display: flex; justify-content: space-between; align-items: center; height: 80px; }
.logo { font-size: 1.5rem; font-weight: 700; color: #fff; letter-spacing: -0.02em; }
.main-navigation ul { list-style: none; display: flex; gap: var(--spacing-md); margin: 0; padding: 0; }
.main-navigation a { color: var(--color-text); font-weight: 600; }
.main-navigation a:hover { color: var(--color-primary); }
.cart-btn { display: flex; align-items: center; gap: 8px; color: #fff; }

/* Split Homepage */
.homepage-split { display: flex; flex-direction: column; min-height: calc(100vh - 80px); }
@media (min-width: 992px) { .homepage-split { flex-direction: row; } }
.split-section {
    flex: 1; display: flex; align-items: center; justify-content: center;
    padding: var(--spacing-lg); position: relative; overflow: hidden;
}
.split-section::before {
    content: ''; position: absolute; top: 0; left: 0; right: 0; bottom: 0; z-index: 1;
    background-size: cover; background-position: center; transition: transform 10s ease;
}
.split-b2c::before { 
    background-image: linear-gradient(160deg, rgba(10, 15, 18, 0.94) 0%, rgba(22, 80, 78, 0.80) 100%), url('../img/b2c_bg.png'); 
    background-size: cover; background-position: center; background-repeat: no-repeat;
}
.split-b2b::before { 
    background-image: linear-gradient(160deg, rgba(8, 12, 16, 0.96) 0%, rgba(15, 60, 58, 0.75) 100%), url('../img/b2b_bg.png'); 
    background-size: cover; background-position: center; background-repeat: no-repeat;
}
.split-section:hover::before { transform: scale(1.05); }
.split-content {
    position: relative; z-index: 2; max-width: 600px; padding: var(--spacing-md);
    text-shadow: 0 2px 12px rgba(0,0,0,0.8);
}
.split-content h1,
.split-content h2 {
    color: #ffffff;
    text-shadow: 0 2px 16px rgba(0,0,0,0.9);
    font-size: clamp(2.35rem, 4vw, 3.35rem);
    line-height: 1.1;
}
.split-content .split-desc { color: #e8eaed; text-shadow: 0 1px 8px rgba(0,0,0,0.9); }

/* Products Grid */
.products-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); gap: var(--spacing-md); margin-top: var(--spacing-md); }
.product-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.product-card:hover { 
    transform: translateY(-5px); 
    border-color: var(--color-primary); 
    box-shadow: 0 10px 30px rgba(0,0,0,0.3); 
}

.product-image {
    width: 100%;
    height: 220px;
    background: var(--color-bg);
    overflow: hidden;
    display: block;
}

.product-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
}

.product-card:hover .product-image img {
    transform: scale(1.05);
}

.product-title {
    font-size: 1.1rem;
    padding: 12px 12px 4px;
    margin: 0;
    color: #fff;
    text-align: left;
}

.product-price {
    font-size: 1.2rem;
    font-weight: 700;
    color: var(--color-primary);
    padding: 0 12px 8px;
    display: block;
    text-align: left;
}

/* Actions de la carte */
.product-actions {
    display: flex;
    gap: 8px;
    padding: 12px;
    padding-top: 0;
    margin-top: auto;
}

.product-actions .btn {
    flex: 1;
    font-size: 0.9rem;
    padding: 0.75rem;
}

.btn-quick-add {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--color-border);
    color: var(--color-primary);
    width: 44px;
    height: 44px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all var(--transition-fast);
    padding: 0;
}

.btn-quick-add svg { width: 22px; height: 22px; }

.btn-quick-add:hover {
    background: var(--color-primary);
    color: #fff;
    border-color: var(--color-primary);
    transform: scale(1.05);
}

/* Forms */
.sprint3d-form { max-width: 600px; margin: 0 auto; background: var(--color-surface); padding: var(--spacing-lg); border-radius: var(--radius-lg); border: 1px solid var(--color-border); box-shadow: 0 10px 30px rgba(0,0,0,0.2); }
.sprint3d-form label { display: block; margin-bottom: 8px; font-weight: 600; color: #fff; }
.sprint3d-form input, .sprint3d-form textarea, .sprint3d-form select {
    width: 100%; padding: 12px; margin-bottom: 20px; background: var(--color-bg); border: 1px solid var(--color-border);
    color: #fff; border-radius: var(--radius-sm); font-family: var(--font-main);
}
.sprint3d-form input:focus, .sprint3d-form textarea:focus { outline: none; border-color: var(--color-primary); }

/* Animation Utils */
.fade-in { opacity: 0; transform: translateY(20px); transition: opacity 0.6s ease-out, transform 0.6s ease-out; }
.fade-in.is-visible { opacity: 1; transform: translateY(0); }

/* Footer */
.site-footer { border-top: 1px solid var(--color-border); padding: var(--spacing-lg) 0 var(--spacing-md) 0; background-color: var(--color-surface); }
.footer-inner { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: var(--spacing-md); margin-bottom: var(--spacing-md); }
.footer-links ul { list-style: none; padding: 0; margin: 0; }
.footer-links li { margin-bottom: 8px; }
.footer-links a { color: var(--color-text-muted); }
.footer-links a:hover { color: var(--color-primary); }

/* ----------------------------------------
   Navigation — Icône panier + lien actif
   ---------------------------------------- */
.main-navigation a.active { color: var(--color-primary); }

.cart-icon-link {
  display: flex; align-items: center; position: relative;
  color: var(--color-text) !important;
  transition: color var(--transition-fast);
}
.cart-icon-link:hover { color: var(--color-primary) !important; }
.cart-icon-link.active svg { stroke: var(--color-primary); }

.cart-count {
  display: none; align-items: center; justify-content: center;
  position: absolute; top: -8px; right: -10px;
  background: var(--color-primary); color: #fff;
  font-size: 0.65rem; font-weight: 700; line-height: 1;
  width: 18px; height: 18px; border-radius: 50%;
}

/* Hamburger (mobile) */
.hamburger { display: none; flex-direction: column; gap: 5px; background: none; border: none; cursor: pointer; padding: 4px; }
.hamburger span { display: block; width: 24px; height: 2px; background: var(--color-text); border-radius: 9px; transition: all var(--transition-fast); }

/* ----------------------------------------
   Homepage — Split hero
   ---------------------------------------- */
.split-tag {
  display: inline-block; background: rgba(38,154,150,0.15); border: 1px solid var(--color-primary);
  color: var(--color-primary); font-size: 0.85rem; font-weight: 600;
  padding: 4px 14px; border-radius: 99px; margin-bottom: var(--spacing-sm); letter-spacing: 0.03em;
}
.split-desc { color: var(--color-text-muted); margin-bottom: var(--spacing-md); font-size: 1rem; }

.split-divider {
  width: 2px; background: linear-gradient(to bottom, transparent, var(--color-primary), transparent);
  align-self: stretch; flex-shrink: 0;
}
@media (max-width: 991px) {
  .split-divider { width: 100%; height: 2px; background: linear-gradient(to right, transparent, var(--color-primary), transparent); }
}

/* ----------------------------------------
   Boutique — Filtre catégories
   ---------------------------------------- */
.filter-bar { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }
.filter-btn {
  background: var(--color-bg); border: 1px solid var(--color-border); color: var(--color-text);
  padding: 8px 18px; border-radius: 99px; cursor: pointer; font-family: var(--font-main);
  font-size: 0.9rem; font-weight: 600; transition: all var(--transition-fast);
}
.filter-btn:hover { border-color: var(--color-primary); color: var(--color-primary); }
.filter-btn.active { background: var(--color-primary); border-color: var(--color-primary); color: #fff; }

/* ----------------------------------------
   Conception — Services Grid
   ---------------------------------------- */
.services-grid {
  display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: var(--spacing-md);
}
.service-card {
  background: var(--color-surface); border: 1px solid var(--color-border);
  border-radius: var(--radius-lg); padding: var(--spacing-md);
  transition: border-color var(--transition-base), transform var(--transition-base);
}
.service-card:hover { border-color: var(--color-primary); transform: translateY(-4px); }
.service-icon { font-size: 2.5rem; margin-bottom: 12px; }
.service-card h3 { color: #fff; font-size: 1.15rem; margin-bottom: 10px; }
.service-card p { color: var(--color-text-muted); font-size: 0.95rem; margin: 0; }

/* ----------------------------------------
   Portfolio — Projets Ingénierie
   ---------------------------------------- */
.portfolio-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(320px, 1fr));
    gap: var(--spacing-md);
    margin-top: var(--spacing-md);
}

.project-card {
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    overflow: hidden;
    transition: transform var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
}

.project-card:hover {
    transform: translateY(-5px);
    border-color: var(--color-primary);
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
}

.project-image {
    width: 100%;
    height: 200px;
    background: #1a1c1e;
    position: relative;
    overflow: hidden;
}

.project-image img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0.8;
}

.project-content {
    padding: var(--spacing-md);
}

.project-category {
    font-size: 0.75rem;
    text-transform: uppercase;
    color: var(--color-primary);
    font-weight: 700;
    letter-spacing: 0.05em;
    margin-bottom: 8px;
    display: block;
}

.project-title {
    font-size: 1.25rem;
    margin-bottom: 12px;
    color: #fff;
}

.project-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    margin-bottom: 15px;
}

.tag-badge {
    background: rgba(255,255,255,0.05);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    font-size: 0.7rem;
    padding: 2px 8px;
    border-radius: 4px;
    font-weight: 600;
}

.project-desc {
    font-size: 0.9rem;
    color: var(--color-text-muted);
    line-height: 1.5;
    margin: 0;
}

/* ----------------------------------------
   Compte — Onglets login / register
   ---------------------------------------- */
.account-tabs {
  display: flex; gap: 0; border-bottom: 2px solid var(--color-border);
  margin-bottom: var(--spacing-md);
}
.tab-btn {
  background: none; border: none; color: var(--color-text-muted); padding: 12px 24px;
  font-family: var(--font-main); font-size: 1rem; font-weight: 600; cursor: pointer;
  border-bottom: 2px solid transparent; margin-bottom: -2px; transition: all var(--transition-fast);
}
.tab-btn:hover { color: var(--color-text); }
.tab-btn.active { color: var(--color-primary); border-bottom-color: var(--color-primary); }

/* ----------------------------------------
   Responsive Mobile
   ---------------------------------------- */
@media (max-width: 768px) {
  .main-navigation { display: none; position: absolute; top: 80px; left: 0; right: 0;
    background: var(--color-surface); border-bottom: 1px solid var(--color-border); padding: var(--spacing-sm); }
  .main-navigation.is-open { display: block; }
  .main-navigation ul { flex-direction: column; gap: var(--spacing-sm); }
  .hamburger { display: flex; }
  .homepage-split { flex-direction: column; }
  .services-grid { grid-template-columns: 1fr; }
  .sprint3d-form div[style*="grid-template-columns"] { grid-template-columns: 1fr !important; }
}

/* ----------------------------------------
   Upload Photo — Personnalisation
   ---------------------------------------- */
.photo-upload-zone {
  margin: 0 12px 12px;
}
.photo-upload-label {
  display: flex; flex-direction: column; align-items: center; justify-content: center;
  gap: 4px; padding: 14px 10px; cursor: pointer;
  border: 2px dashed var(--color-border); border-radius: var(--radius-md);
  color: var(--color-text-muted); transition: border-color var(--transition-fast), color var(--transition-fast), background var(--transition-fast);
  background: rgba(0,0,0,0.12);
}
.photo-upload-label:hover {
  border-color: var(--color-primary); color: var(--color-primary); background: rgba(38,154,150,0.06);
}
.photo-upload-zone.drag-over .photo-upload-label {
  border-color: var(--color-primary); background: rgba(38,154,150,0.12); color: var(--color-primary);
}
.upload-icon { font-size: 1.6rem; line-height: 1; }
.upload-text { font-size: 0.9rem; font-weight: 600; text-align: center; }
.upload-hint { font-size: 0.75rem; opacity: 0.6; }
.upload-required-msg {
  color: #e67e22; font-size: 0.8rem; text-align: center; margin: 0 12px 8px; padding: 6px;
  background: rgba(230,126,34,0.08); border-radius: var(--radius-sm); border: 1px solid rgba(230,126,34,0.3);
}