/* ==========================================================================
   BASE & RESET STYLES - MOBILE FIRST
   ========================================================================== */

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

html {
  font-size: 15px; /* base réduite : toutes les tailles en rem suivent (16px → 15px, soit -6%) */
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 20px);
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  background-color: var(--color-bg-main);
  color: var(--color-text-primary);
  line-height: 1.6;
  min-height: 100vh;
  overflow-x: hidden;
  background-image: 
    radial-gradient(ellipse 80% 50% at 50% -20%, rgba(0, 188, 212, 0.12), transparent),
    radial-gradient(ellipse 60% 40% at 80% 60%, rgba(245, 158, 11, 0.06), transparent);
}

img, svg {
  display: block;
  max-width: 100%;
  height: auto;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition-fast);
}

button, input, textarea, select {
  font: inherit;
  color: inherit;
  border: none;
  background: none;
  outline: none;
}

button {
  cursor: pointer;
}

/* ==========================================================================
   CONTAINER & LAYOUT
   ========================================================================== */

.container {
  width: 100%;
  max-width: var(--max-width);
  margin-inline: auto;
  padding-inline: 1.25rem;
}

@media (min-width: 768px) {
  .container {
    padding-inline: 2rem;
  }
}

.section {
  padding-block: 4.5rem;
  position: relative;
}

@media (min-width: 768px) {
  .section {
    padding-block: 6rem;
  }
}

.section-header {
  text-align: center;
  max-width: 680px;
  margin-inline: auto;
  margin-bottom: 3rem;
}

.section-tag {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  border-radius: var(--radius-full);
  background: rgba(0, 188, 212, 0.1);
  color: var(--color-accent-cyan);
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border: 1px solid rgba(0, 188, 212, 0.25);
  margin-bottom: 1rem;
}

.section-title {
  font-size: 1.85rem;
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-text-primary);
  margin-bottom: 0.85rem;
  letter-spacing: -0.02em;
}

@media (min-width: 768px) {
  .section-title {
    font-size: 2.35rem;
  }
}

.section-subtitle {
  font-size: 1rem;
  color: var(--color-text-muted);
  line-height: 1.65;
}

@media (min-width: 768px) {
  .section-subtitle {
    font-size: 1.125rem;
  }
}