/* ==========================================================================
   IMES — Ingénierie Mise En Service
   Design system : Corporate Engineering / Minimaliste / B2B Haut de Gamme
   ========================================================================== */

:root {
  /* Couleurs */
  --color-bg: #FFFFFF;
  --color-bg-soft: #F8FAFC;
  --color-bg-soft-2: #F1F5F9;
  --color-primary: #0F172A;
  --color-primary-light: #0B192C;
  --color-accent: #0284C7;
  --color-accent-2: #00A6FB;
  --color-emerald: #059669;
  --color-text: #1E293B;
  --color-text-muted: #475569;
  --color-border: #E2E8F0;
  --color-white: #FFFFFF;

  /* Typo */
  --font-heading: 'Plus Jakarta Sans', 'Inter', system-ui, sans-serif;
  --font-body: 'Inter', system-ui, sans-serif;

  /* Rayon / ombres */
  --radius-sm: 8px;
  --radius-md: 14px;
  --radius-lg: 22px;
  --shadow-sm: 0 1px 2px rgba(15, 23, 42, 0.06);
  --shadow-md: 0 8px 24px rgba(15, 23, 42, 0.08);
  --shadow-lg: 0 20px 48px rgba(15, 23, 42, 0.12);

  /* Transitions */
  --ease: cubic-bezier(0.4, 0, 0.2, 1);
  --header-height: 84px;
}

/* ---------- Reset ---------- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; scroll-padding-top: var(--header-height); }
body {
  font-family: var(--font-body);
  color: var(--color-text);
  background: var(--color-bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }
ul { list-style: none; }
button { font: inherit; cursor: pointer; border: none; background: none; color: inherit; }
input, textarea, select { font: inherit; color: inherit; }
h1, h2, h3, h4, h5 { font-family: var(--font-heading); color: var(--color-primary); font-weight: 700; line-height: 1.2; }

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--color-primary);
  color: #fff;
  padding: 12px 20px;
  z-index: 9999;
  border-radius: 0 0 var(--radius-sm) 0;
}
.skip-link:focus { left: 0; }

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

.container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ---------- Typography helpers ---------- */
.text-gradient {
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-2) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.text-white { color: #fff; }
.text-muted-light { color: rgba(255, 255, 255, 0.72); margin-bottom: 16px; }

.eyebrow {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 14px;
}
.eyebrow-light { color: var(--color-accent-2); }

.section-head {
  max-width: 680px;
  margin: 0 auto 56px;
  text-align: center;
}
.section-head h2 { font-size: clamp(1.7rem, 3vw, 2.4rem); margin-bottom: 14px; }
.section-head p { color: var(--color-text-muted); font-size: 1.05rem; }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 26px;
  border-radius: var(--radius-sm);
  font-weight: 600;
  font-size: 0.95rem;
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), background-color 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
  white-space: nowrap;
}
.btn i { font-size: 0.9em; }
.btn-primary {
  background: var(--color-primary);
  color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: var(--color-accent); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-outline {
  background: transparent;
  color: var(--color-primary);
  border: 1.5px solid var(--color-border);
}
.btn-outline:hover { border-color: var(--color-accent); color: var(--color-accent); transform: translateY(-2px); }
.btn-lg { padding: 16px 32px; font-size: 1rem; }
.btn-block { width: 100%; }
.btn-header-cta { display: none; }

/* ==========================================================================
   HEADER
   ========================================================================== */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s var(--ease), box-shadow 0.3s var(--ease);
}
.site-header.scrolled {
  border-bottom-color: var(--color-border);
  box-shadow: 0 4px 20px rgba(15, 23, 42, 0.06);
}
.header-inner {
  height: var(--header-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}
.logo { display: flex; flex-direction: column; line-height: 1.1; }
.logo-mark {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.6rem;
  color: var(--color-primary);
  letter-spacing: 0.02em;
}
.logo-sub {
  font-size: 0.62rem;
  color: var(--color-text-muted);
  font-weight: 600;
  letter-spacing: 0.03em;
  margin-top: 2px;
}

.main-nav { display: none; }
.main-nav ul { display: flex; gap: 32px; }
.nav-link {
  position: relative;
  font-weight: 600;
  font-size: 0.94rem;
  color: var(--color-text);
  padding: 6px 0;
}
.nav-link::after {
  content: '';
  position: absolute;
  left: 0; bottom: -2px;
  width: 0; height: 2px;
  background: var(--color-accent);
  transition: width 0.25s var(--ease);
}
.nav-link:hover::after, .nav-link.active::after { width: 100%; }
.nav-link:hover { color: var(--color-accent); }

.hamburger {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  align-items: center;
}
.hamburger span {
  width: 22px;
  height: 2px;
  background: var(--color-primary);
  border-radius: 2px;
  transition: transform 0.3s var(--ease), opacity 0.3s var(--ease);
}
.hamburger.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.hamburger.active span:nth-child(2) { opacity: 0; }
.hamburger.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

.mobile-menu {
  position: fixed;
  top: var(--header-height);
  left: 0; right: 0;
  bottom: 0;
  background: #fff;
  padding: 32px 24px;
  transform: translateX(100%);
  opacity: 0;
  visibility: hidden;
  transition: transform 0.35s var(--ease), opacity 0.35s var(--ease), visibility 0.35s;
  overflow-y: auto;
  z-index: 999;
}
.mobile-menu.open { transform: translateX(0); opacity: 1; visibility: visible; }
.mobile-menu ul { display: flex; flex-direction: column; gap: 4px; margin-bottom: 28px; }
.mobile-menu .nav-link { display: block; font-size: 1.15rem; padding: 14px 4px; border-bottom: 1px solid var(--color-border); }

@media (min-width: 960px) {
  .main-nav { display: block; }
  .btn-header-cta { display: inline-flex; }
  .hamburger { display: none; }
  .mobile-menu { display: none; }
}

/* ==========================================================================
   HERO
   ========================================================================== */
.hero {
  position: relative;
  padding: calc(var(--header-height) + 64px) 0 80px;
  overflow: hidden;
  background: var(--color-bg-soft);
}
.hero-bg { position: absolute; inset: 0; z-index: 0; }
.hero-grid {
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(15, 23, 42, 0.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(15, 23, 42, 0.045) 1px, transparent 1px);
  background-size: 48px 48px;
  mask-image: radial-gradient(ellipse 70% 60% at 50% 0%, black 40%, transparent 100%);
}
.hero-glow {
  position: absolute;
  top: -180px; right: -180px;
  width: 560px; height: 560px;
  background: radial-gradient(circle, rgba(0, 166, 251, 0.16) 0%, transparent 70%);
  border-radius: 50%;
}
.hero-inner { position: relative; z-index: 1; text-align: center; }

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  background: #fff;
  border: 1px solid var(--color-border);
  padding: 9px 18px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--color-text-muted);
  box-shadow: var(--shadow-sm);
  margin-bottom: 28px;
}
.hero-badge i { color: var(--color-accent); }
.hero-badge .dot {
  width: 4px; height: 4px;
  border-radius: 50%;
  background: var(--color-border);
}

.hero h1 {
  font-size: clamp(2.1rem, 5.5vw, 3.6rem);
  max-width: 900px;
  margin: 0 auto 22px;
  letter-spacing: -0.02em;
}
.hero-subtitle {
  max-width: 640px;
  margin: 0 auto 36px;
  font-size: 1.1rem;
  color: var(--color-text-muted);
}
.hero-cta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 16px;
  margin-bottom: 64px;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 28px 20px;
  max-width: 760px;
  margin: 0 auto;
  padding-top: 40px;
  border-top: 1px solid var(--color-border);
}
.hero-stat { display: flex; flex-direction: column; gap: 4px; }
.hero-stat-num {
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 800;
  color: var(--color-primary);
}
.hero-stat-label { font-size: 0.85rem; color: var(--color-text-muted); font-weight: 500; }

@media (min-width: 720px) {
  .hero-stats { grid-template-columns: repeat(4, 1fr); }
}

/* ==========================================================================
   SECTIONS GÉNÉRALES
   ========================================================================== */
.section { padding: 96px 0; }
.section-alt { background: var(--color-bg-soft); }
.section-dark { background: var(--color-primary); }

/* ---------- Cards Expertises ---------- */
.cards-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 640px) { .cards-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1080px) { .cards-grid { grid-template-columns: repeat(4, 1fr); } }

.expertise-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 32px 26px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
  position: relative;
  overflow: hidden;
}
.expertise-card::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-2));
  transform: scaleX(0);
  transform-origin: left;
  transition: transform 0.35s var(--ease);
}
.expertise-card:hover {
  transform: translateY(-8px);
  box-shadow: var(--shadow-lg);
  border-color: transparent;
}
.expertise-card:hover::before { transform: scaleX(1); }

.expertise-icon {
  width: 56px; height: 56px;
  border-radius: var(--radius-md);
  background: var(--color-bg-soft-2);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  margin-bottom: 20px;
  transition: background 0.35s var(--ease), color 0.35s var(--ease), transform 0.35s var(--ease);
}
.expertise-card:hover .expertise-icon {
  background: var(--color-primary);
  color: var(--color-accent-2);
  transform: scale(1.08) rotate(-4deg);
}
.expertise-card h3 { font-size: 1.15rem; margin-bottom: 10px; }
.expertise-card p { color: var(--color-text-muted); font-size: 0.94rem; margin-bottom: 18px; }
.expertise-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.expertise-tags li {
  font-size: 0.76rem;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 999px;
  background: var(--color-bg-soft-2);
  color: var(--color-text-muted);
}

/* ---------- Timeline (méthodologie) ---------- */
.timeline {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  position: relative;
}
@media (min-width: 900px) {
  .timeline { grid-template-columns: repeat(4, 1fr); gap: 24px; }
  .timeline::before {
    content: '';
    position: absolute;
    top: 74px; left: 8%; right: 8%;
    height: 2px;
    background: repeating-linear-gradient(to right, var(--color-border) 0 10px, transparent 10px 18px);
    z-index: 0;
  }
}
.timeline-item {
  position: relative;
  z-index: 1;
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 30px 24px;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease);
}
.timeline-item:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); }
.timeline-num {
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 800;
  color: var(--color-accent-2);
  letter-spacing: 0.05em;
  margin-bottom: 14px;
}
.timeline-icon {
  width: 52px; height: 52px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  margin-bottom: 18px;
}
.timeline-item h3 { font-size: 1.05rem; margin-bottom: 8px; }
.timeline-item p { font-size: 0.9rem; color: var(--color-text-muted); }

/* ---------- Secteurs ---------- */
.sectors-grid {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
}
.sector-badge {
  display: flex;
  align-items: center;
  gap: 10px;
  background: #fff;
  border: 1px solid var(--color-border);
  padding: 14px 22px;
  border-radius: 999px;
  font-weight: 600;
  font-size: 0.92rem;
  color: var(--color-text);
  transition: all 0.3s var(--ease);
}
.sector-badge i { color: var(--color-accent); font-size: 1.05rem; }
.sector-badge:hover {
  background: var(--color-primary);
  color: #fff;
  border-color: var(--color-primary);
  transform: translateY(-3px);
}
.sector-badge:hover i { color: var(--color-accent-2); }

/* ---------- Références / Projets ---------- */
.filters {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 44px;
}
.filter-btn {
  padding: 10px 20px;
  border-radius: 999px;
  border: 1px solid var(--color-border);
  background: #fff;
  font-weight: 600;
  font-size: 0.88rem;
  color: var(--color-text-muted);
  transition: all 0.25s var(--ease);
}
.filter-btn:hover { border-color: var(--color-accent); color: var(--color-accent); }
.filter-btn.active { background: var(--color-primary); color: #fff; border-color: var(--color-primary); }

.projects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}
@media (min-width: 720px) { .projects-grid { grid-template-columns: repeat(2, 1fr); } }
@media (min-width: 1120px) { .projects-grid { grid-template-columns: repeat(3, 1fr); } }

.project-card {
  background: #fff;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 28px;
  transition: transform 0.4s var(--ease), box-shadow 0.4s var(--ease);
  display: flex;
  flex-direction: column;
}
.project-card.hidden { display: none; }
.project-card:hover { transform: translateY(-6px); box-shadow: var(--shadow-lg); }

.project-status {
  display: inline-flex;
  align-self: flex-start;
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 5px 12px;
  border-radius: 999px;
  margin-bottom: 16px;
}
.status-done { background: rgba(5, 150, 105, 0.1); color: var(--color-emerald); }
.status-progress { background: rgba(2, 132, 199, 0.1); color: var(--color-accent); }
.status-upcoming { background: rgba(15, 23, 42, 0.08); color: var(--color-primary); }

.project-card h3 { font-size: 1.1rem; margin-bottom: 10px; }
.project-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  font-weight: 600;
  margin-bottom: 12px;
}
.project-meta i { color: var(--color-accent); font-size: 0.85rem; }
.project-desc { font-size: 0.92rem; color: var(--color-text-muted); margin-bottom: 18px; flex-grow: 1; }
.project-tags { display: flex; flex-wrap: wrap; gap: 8px; }
.project-tags span {
  font-size: 0.74rem;
  font-weight: 600;
  padding: 5px 11px;
  border-radius: 999px;
  background: var(--color-bg-soft-2);
  color: var(--color-text-muted);
}

/* ---------- À propos ---------- */
.section-dark .eyebrow { margin-bottom: 14px; }
.section-dark h2 { color: #fff; font-size: clamp(1.6rem, 3vw, 2.2rem); margin-bottom: 20px; }
.about-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  align-items: center;
}
@media (min-width: 960px) { .about-grid { grid-template-columns: 1.1fr 0.9fr; } }

.about-points { display: flex; flex-direction: column; gap: 14px; margin-top: 24px; }
.about-point { display: flex; align-items: center; gap: 12px; color: rgba(255, 255, 255, 0.9); font-weight: 500; font-size: 0.95rem; }
.about-point i { color: var(--color-accent-2); font-size: 1.1rem; flex-shrink: 0; }

.about-visual { display: flex; flex-direction: column; gap: 18px; }
.about-card {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius-lg);
  padding: 24px;
  transition: transform 0.3s var(--ease), background 0.3s var(--ease);
}
.about-card:hover { transform: translateX(6px); background: rgba(255, 255, 255, 0.08); }
.about-card i { color: var(--color-accent-2); font-size: 1.4rem; margin-bottom: 12px; }
.about-card h4 { color: #fff; font-size: 1rem; margin-bottom: 6px; }
.about-card p { color: rgba(255, 255, 255, 0.68); font-size: 0.88rem; }

/* ==========================================================================
   CONTACT
   ========================================================================== */
.contact-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}
@media (min-width: 960px) { .contact-grid { grid-template-columns: 0.85fr 1.15fr; } }

.contact-item { display: flex; gap: 16px; margin-bottom: 26px; }
.contact-icon {
  width: 46px; height: 46px;
  flex-shrink: 0;
  border-radius: var(--radius-sm);
  background: var(--color-bg-soft-2);
  color: var(--color-accent);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
}
.contact-item h4 { font-size: 0.98rem; margin-bottom: 4px; }
.contact-item p, .contact-item a { color: var(--color-text-muted); font-size: 0.94rem; }
.contact-item a:hover { color: var(--color-accent); }

.map-wrapper {
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--color-border);
  margin-top: 8px;
}
.map-wrapper iframe { display: block; }

.contact-form {
  background: var(--color-bg-soft);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: 36px 30px;
}
.form-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}
@media (min-width: 560px) { .form-row { grid-template-columns: 1fr 1fr; } }

.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 0.88rem; font-weight: 600; margin-bottom: 8px; color: var(--color-text); }
.required { color: #DC2626; }
.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  border: 1.5px solid var(--color-border);
  background: #fff;
  font-size: 0.94rem;
  transition: border-color 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 4px rgba(2, 132, 199, 0.12);
}
.form-group textarea { resize: vertical; min-height: 120px; }
.form-group.error input,
.form-group.error select,
.form-group.error textarea { border-color: #DC2626; }
.error-msg {
  display: block;
  font-size: 0.78rem;
  color: #DC2626;
  margin-top: 6px;
  min-height: 1em;
}

/* Honeypot : masqué visuellement mais accessible aux robots */
.hp-field {
  position: absolute;
  left: -9999px;
  width: 1px;
  height: 1px;
  overflow: hidden;
}

.form-note {
  margin-top: 16px;
  font-size: 0.88rem;
  text-align: center;
  min-height: 1.2em;
}
.form-note.success { color: var(--color-emerald); font-weight: 600; }
.form-note.error { color: #DC2626; font-weight: 600; }

/* ==========================================================================
   FOOTER
   ========================================================================== */
.site-footer { background: var(--color-primary); color: rgba(255, 255, 255, 0.8); padding-top: 72px; }
.footer-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-bottom: 56px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}
@media (min-width: 720px) { .footer-inner { grid-template-columns: 1.4fr 1fr 1fr 1fr; } }

.footer-brand .logo-mark { color: #fff; font-size: 1.5rem; }
.footer-brand p { font-size: 0.88rem; margin-top: 12px; color: rgba(255, 255, 255, 0.62); max-width: 280px; }
.footer-address { margin-top: 8px !important; }

.footer-col h5 { color: #fff; font-size: 0.9rem; margin-bottom: 18px; letter-spacing: 0.03em; text-transform: uppercase; }
.footer-col ul { display: flex; flex-direction: column; gap: 11px; }
.footer-col a { font-size: 0.9rem; color: rgba(255, 255, 255, 0.65); transition: color 0.25s var(--ease); }
.footer-col a:hover { color: var(--color-accent-2); }

.footer-bottom { padding: 24px 0; text-align: center; }
.footer-bottom p { font-size: 0.82rem; color: rgba(255, 255, 255, 0.5); }

/* ==========================================================================
   MODALES
   ========================================================================== */
.modal-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.6);
  backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s var(--ease), visibility 0.3s;
}
.modal-overlay.open { opacity: 1; visibility: visible; }
.modal-box {
  background: #fff;
  border-radius: var(--radius-lg);
  padding: 40px;
  max-width: 560px;
  width: 100%;
  max-height: 80vh;
  overflow-y: auto;
  position: relative;
  transform: translateY(20px) scale(0.98);
  transition: transform 0.3s var(--ease);
}
.modal-overlay.open .modal-box { transform: translateY(0) scale(1); }
.modal-box h3 { margin-bottom: 18px; }
.modal-box p { margin-bottom: 12px; font-size: 0.94rem; color: var(--color-text-muted); }
.modal-close {
  position: absolute;
  top: 18px; right: 18px;
  width: 36px; height: 36px;
  border-radius: 50%;
  background: var(--color-bg-soft-2);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.25s var(--ease);
}
.modal-close:hover { background: var(--color-border); }

/* ==========================================================================
   BACK TO TOP
   ========================================================================== */
.back-to-top {
  position: fixed;
  bottom: 28px;
  right: 28px;
  width: 48px; height: 48px;
  border-radius: 50%;
  background: var(--color-primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: all 0.3s var(--ease);
  z-index: 900;
}
.back-to-top.visible { opacity: 1; visibility: visible; transform: translateY(0); }
.back-to-top:hover { background: var(--color-accent); transform: translateY(-4px); }

/* ==========================================================================
   REDUCED MOTION
   ========================================================================== */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}