/* =========================================================
   RESET & BASE
   ========================================================= */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background-color: var(--c-bg);
  color: var(--c-text);
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

img, svg, video { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--t-fast) var(--ease-smooth); }
ul, ol { margin: 0; padding: 0; list-style: none; }

::selection { background: var(--c-accent-soft); color: var(--c-text-strong); }

/* =========================================================
   TYPOGRAPHIE
   ========================================================= */
h1, h2, h3, h4 {
  margin: 0;
  color: var(--c-text-strong);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}

h1 {
  font-size: clamp(2.25rem, 5.2vw, 4rem);
  font-weight: 700;
  letter-spacing: -0.035em;
  line-height: 1.05;
}

h2 { font-size: clamp(1.75rem, 3.6vw, 2.5rem); line-height: 1.2; }
h3 { font-size: 1.25rem; line-height: 1.3; }
h4 { font-size: 1.0625rem; }

p { margin: 0; color: var(--c-text-muted); line-height: 1.7; }

/* =========================================================
   LAYOUT - SECTIONS & CONTAINERS
   ========================================================= */
.section {
  position: relative;
  padding-top: var(--section-py);
  padding-bottom: var(--section-py);
}

.section + .section {
  border-top: 1px solid var(--c-border);
}

.section--alt {
  background-color: var(--c-surface);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding-left: var(--container-pad);
  padding-right: var(--container-pad);
}

.container--narrow {
  max-width: var(--container-narrow);
}

/* =========================================================
   SECTION HEADER
   ========================================================= */
.section__header {
  max-width: 720px;
  margin-bottom: var(--s-9);
}

.section__eyebrow {
  display: inline-block;
  margin-bottom: var(--s-4);
  color: var(--c-accent-hover);
  font-size: 0.75rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.section__title {
  margin-bottom: var(--s-5);
}

.section__intro {
  font-size: 1.125rem;
  color: var(--c-text-muted);
  max-width: 640px;
}

/* =========================================================
   BOUTONS
   ========================================================= */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--s-2);
  padding: 0.875rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--r-md);
  font-family: inherit;
  font-size: 0.9375rem;
  font-weight: 500;
  line-height: 1;
  cursor: pointer;
  user-select: none;
  white-space: nowrap;
  transition:
    background-color var(--t-base) var(--ease-smooth),
    border-color var(--t-base) var(--ease-smooth),
    color var(--t-base) var(--ease-smooth),
    transform var(--t-fast) var(--ease-smooth),
    box-shadow var(--t-base) var(--ease-smooth);
}

.btn:focus-visible {
  outline: 2px solid var(--c-accent);
  outline-offset: 3px;
}

.btn:active { transform: translateY(1px); }

.btn__arrow {
  display: inline-block;
  transition: transform var(--t-base) var(--ease);
}

.btn:hover .btn__arrow {
  transform: translateX(3px);
}

.btn--primary {
  background-color: var(--c-accent);
  color: #fff;
  border-color: var(--c-accent);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.12);
}

.btn--primary:hover {
  background-color: var(--c-accent-hover);
  border-color: var(--c-accent-hover);
  box-shadow: 0 6px 20px rgba(91, 141, 239, 0.32), inset 0 1px 0 rgba(255, 255, 255, 0.15);
}

.btn--secondary {
  background-color: transparent;
  color: var(--c-text);
  border-color: var(--c-border-2);
}

.btn--secondary:hover {
  border-color: var(--c-border-3);
  background-color: var(--c-surface-2);
  color: var(--c-text-strong);
}

.btn--ghost {
  background-color: var(--c-surface-2);
  color: var(--c-text);
  border-color: var(--c-border);
}

.btn--ghost:hover {
  border-color: var(--c-border-2);
  background-color: var(--c-surface-3);
  color: var(--c-text-strong);
}

.btn--large {
  padding: 1.125rem 1.875rem;
  font-size: 1rem;
}