/* ============================================================
   DESIGN SYSTEM — Forge·SaaS | Apple Corporate Light
   Pro, Sobre, Clair — cible 30-50 ans
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800;900&display=swap');

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

:root {
  --bg-primary:    #ffffff;
  --bg-secondary:  #f5f5f7;
  --bg-tertiary:   #fbfbfd;
  --bg-card:       #ffffff;
  --bg-card-hover: #ffffff;
  --border:        #d2d2d7;
  --border-light:  #e8e8ed;
  --border-hover:  #b0b0b5;

  --text-primary:   #1d1d1f;
  --text-secondary: #6e6e73;
  --text-tertiary:  #86868b;
  --text-muted:     #aeaeb2;

  --accent:         #0071e3;
  --accent-hover:   #0077ed;
  --accent-light:   #e8f2ff;
  --green:          #34c759;
  --green-light:    #e8f8ee;
  --red:            #ff3b30;
  --red-light:      #fff0ef;
  --orange:         #ff9500;
  --orange-light:   #fff5e6;

  --radius-sm:  8px;
  --radius-md:  12px;
  --radius-lg:  16px;
  --radius-xl:  20px;

  --shadow-xs:   0 1px 2px rgba(0,0,0,0.04);
  --shadow-sm:   0 1px 3px rgba(0,0,0,0.06), 0 1px 2px rgba(0,0,0,0.04);
  --shadow-md:   0 4px 12px rgba(0,0,0,0.06), 0 1px 3px rgba(0,0,0,0.04);
  --shadow-lg:   0 8px 30px rgba(0,0,0,0.08), 0 2px 8px rgba(0,0,0,0.04);
  --shadow-xl:   0 16px 48px rgba(0,0,0,0.08), 0 4px 16px rgba(0,0,0,0.04);

  --transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  --transition-fast: 0.18s ease;

  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'SF Pro Display', 'Segoe UI', sans-serif;
  --nav-height: 64px;
}

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

body {
  font-family: var(--font);
  background-color: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.6;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* ── Scrollbar ── */
::-webkit-scrollbar { width: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--text-muted); border-radius: 3px; }

/* ── Typography ── */
h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--text-primary);
}

h1 { font-size: clamp(2.4rem, 5.5vw, 4.5rem); font-weight: 800; }
h2 { font-size: clamp(1.8rem, 3.5vw, 3rem); }
h3 { font-size: clamp(1.3rem, 2vw, 1.75rem); font-weight: 600; }
h4 { font-size: 1.15rem; font-weight: 600; }

p { color: var(--text-secondary); line-height: 1.75; }

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

/* ── Accent text (single color, no gradient) ── */
.accent-text { color: var(--accent); }

/* ── Layout Containers ── */
.container {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ── Navigation ── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(20px) saturate(180%);
  -webkit-backdrop-filter: blur(20px) saturate(180%);
  border-bottom: 1px solid var(--border-light);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 24px;
}

.nav-logo {
  font-size: 1.2rem;
  font-weight: 800;
  letter-spacing: -0.04em;
  color: var(--text-primary);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

.nav-links a {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background var(--transition-fast);
}
.nav-links a:hover { color: var(--text-primary); background: var(--bg-secondary); }
.nav-links a.active { color: var(--text-primary); font-weight: 600; }

.nav-cta {
  background: var(--accent) !important;
  color: #fff !important;
  padding: 8px 18px !important;
  border-radius: 100px !important;
  font-weight: 600 !important;
  transition: background var(--transition-fast), transform var(--transition-fast) !important;
}
.nav-cta:hover {
  background: var(--accent-hover) !important;
  transform: scale(1.02) !important;
}

.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: var(--transition);
}

/* ── Buttons ── */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 13px 26px;
  border-radius: 100px;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font);
  cursor: pointer;
  border: none;
  transition: var(--transition);
  letter-spacing: -0.01em;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #fff;
}
.btn-primary:hover {
  background: var(--accent-hover);
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(0,113,227,0.25);
}

.btn-secondary {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border: 1px solid var(--border-light);
}
.btn-secondary:hover {
  background: #ececef;
  border-color: var(--border);
  transform: translateY(-1px);
}

.btn-ghost {
  background: transparent;
  color: var(--accent);
  padding-left: 0;
  padding-right: 0;
}
.btn-ghost:hover { opacity: 0.75; }

.btn-lg {
  padding: 15px 32px;
  font-size: 1rem;
}

/* ── Cards ── */
.card {
  background: var(--bg-card);
  border: 1px solid var(--border-light);
  border-radius: var(--radius-lg);
  padding: 32px;
  transition: var(--transition);
  box-shadow: var(--shadow-sm);
}
.card:hover {
  border-color: var(--border);
  transform: translateY(-3px);
  box-shadow: var(--shadow-lg);
}

/* ── Section Layout ── */
section {
  padding: 88px 0;
  position: relative;
}
.section-label {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}
.section-title {
  margin-bottom: 18px;
  color: var(--text-primary);
}
.section-subtitle {
  font-size: 1.1rem;
  color: var(--text-secondary);
  max-width: 560px;
  line-height: 1.8;
  margin-bottom: 48px;
}

/* ── Grid ── */
.grid-2 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 24px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.grid-4 { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }

/* ── Icon Pill ── */
.icon-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  border-radius: var(--radius-md);
  font-size: 1.4rem;
  margin-bottom: 18px;
  background: var(--accent-light);
}

/* ── Footer ── */
.footer {
  border-top: 1px solid var(--border-light);
  padding: 56px 0 40px;
  background: var(--bg-secondary);
}
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 48px;
}
.footer-brand p {
  margin-top: 12px;
  font-size: 0.88rem;
  max-width: 280px;
  color: var(--text-secondary);
}
.footer-nav h5 {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--text-primary);
  margin-bottom: 16px;
  text-transform: uppercase;
}
.footer-nav ul { list-style: none; display: flex; flex-direction: column; gap: 10px; }
.footer-nav ul li a {
  font-size: 0.875rem;
  color: var(--text-secondary);
  transition: color var(--transition-fast);
}
.footer-nav ul li a:hover { color: var(--accent); }
.footer-bottom {
  margin-top: 48px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-tertiary);
}

/* ── Scroll Reveal ── */
.reveal {
  opacity: 0;
  transform: translateY(28px);
  transition: opacity 0.65s cubic-bezier(0.16, 1, 0.3, 1),
              transform 0.65s cubic-bezier(0.16, 1, 0.3, 1);
}
.reveal.visible { opacity: 1; transform: translateY(0); }
.reveal-delay-1 { transition-delay: 0.1s; }
.reveal-delay-2 { transition-delay: 0.2s; }
.reveal-delay-3 { transition-delay: 0.3s; }
.reveal-delay-4 { transition-delay: 0.4s; }

/* ── Page Header ── */
.page-header {
  padding: 140px 0 72px;
  text-align: center;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border-light);
}

/* ── Alt Section bg ── */
.section-alt { background: var(--bg-secondary); }

/* ── Responsive ── */
@media (max-width: 1024px) {
  .grid-4 { grid-template-columns: repeat(2, 1fr); }
  .footer-inner { grid-template-columns: 1fr 1fr; gap: 32px; }
}

@media (max-width: 768px) {
  :root { --nav-height: 56px; }
  section { padding: 64px 0; }
  .grid-2, .grid-3, .grid-4 { grid-template-columns: 1fr; }
  .nav-links {
    display: none;
    flex-direction: column;
    position: absolute;
    top: 100%; left: 0; right: 0;
    background: rgba(255,255,255,0.96);
    backdrop-filter: blur(20px);
    padding: 16px 24px;
    gap: 4px;
    border-bottom: 1px solid var(--border-light);
  }
  .nav-links.open { display: flex; }
  .nav-hamburger { display: flex; }
  .footer-inner { grid-template-columns: 1fr; }
  .page-header { padding: 110px 0 48px; }
  .card { padding: 24px; }
}