/* Dicentur design system — Noir et blanc */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --black: #000000;
  --gray-900: #171717;
  --gray-800: #262626;
  --gray-700: #404040;
  --gray-600: #525252;
  --gray-500: #737373;
  --gray-400: #a3a3a3;
  --gray-300: #d4d4d4;
  --gray-200: #e5e5e5;
  --gray-100: #f5f5f5;
  --gray-50: #fafafa;
  --white: #ffffff;
  --max-w: 64rem;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--gray-900);
  line-height: 1.7;
  background: var(--white);
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  padding-top: 4rem;
}

a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

.container { max-width: var(--max-w); margin: 0 auto; padding: 0 1.5rem; }

/* ===== Header ===== */
.ei-header {
  border-bottom: 1px solid var(--gray-200);
  background: var(--white);
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  box-shadow: 0 1px 3px rgba(0,0,0,.04);
}

.ei-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

.ei-logo {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--black);
  letter-spacing: -0.02em;
}

.ei-logo span { color: var(--gray-600); }

.ei-nav {
  display: flex;
  align-items: center;
  gap: 1.75rem;
  font-size: .875rem;
  font-weight: 500;
  color: var(--gray-500);
}

.ei-nav a:hover { color: var(--black); transition: color .15s; }

.ei-nav-cta {
  display: inline-flex;
  align-items: center;
  gap: .375rem;
  background: var(--black);
  color: var(--white) !important;
  font-size: .875rem;
  font-weight: 600;
  padding: .5rem 1rem;
  border-radius: .5rem;
  transition: background .15s;
}

.ei-nav-cta:hover { background: var(--gray-800); }

/* Mobile nav toggle */
.ei-mobile-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.ei-mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--black);
  margin: 5px 0;
  transition: .3s;
}

/* ===== Hero ===== */
.ei-hero {
  background: var(--gray-50);
  border-bottom: 1px solid var(--gray-200);
  padding: 5rem 0 7rem;
}

.ei-hero .container { max-width: 48rem; }

.ei-badge {
  display: inline-block;
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--gray-600);
  background: var(--gray-200);
  padding: .25rem .75rem;
  border-radius: 9999px;
  margin-bottom: 1.5rem;
}

.ei-hero h1 {
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 800;
  color: var(--black);
  line-height: 1.15;
  margin-bottom: 1.5rem;
  letter-spacing: -0.02em;
}

.ei-hero h1 span { color: var(--gray-600); }

.ei-hero-desc {
  font-size: 1.125rem;
  color: var(--gray-500);
  line-height: 1.7;
  margin-bottom: 2.5rem;
  max-width: 42rem;
}

.ei-hero-ctas {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.ei-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  background: var(--black);
  color: var(--white);
  font-weight: 600;
  padding: .875rem 1.5rem;
  border-radius: .5rem;
  font-size: 1rem;
  transition: background .15s;
  border: none;
  cursor: pointer;
}

.ei-btn-primary:hover { background: var(--gray-800); }

.ei-btn-outline {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .5rem;
  border: 1px solid var(--gray-300);
  color: var(--black);
  font-weight: 600;
  padding: .875rem 1.5rem;
  border-radius: .5rem;
  font-size: 1rem;
  transition: all .15s;
  background: transparent;
}

.ei-btn-outline:hover { background: var(--gray-50); border-color: var(--gray-400); }

/* ===== Stats bar ===== */
.ei-stats {
  background: var(--black);
  color: var(--white);
  padding: 2rem 0;
}

.ei-stats-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  text-align: center;
}

.ei-stats-grid > div { padding: 0 1.5rem; }
.ei-stats-grid > div + div { border-left: 1px solid var(--gray-800); }

.ei-stat-value {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--white);
}

.ei-stat-label {
  font-size: .875rem;
  color: var(--gray-400);
  margin-top: .25rem;
}

/* ===== Section generics ===== */
.ei-section { padding: 5rem 0; }

.ei-section-label {
  font-size: .75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--gray-500);
  margin-bottom: .5rem;
}

.ei-section-title {
  font-size: 1.875rem;
  font-weight: 800;
  color: var(--black);
  letter-spacing: -0.01em;
}

/* ===== Article cards ===== */
.ei-articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.ei-article-card {
  display: block;
  border: 1px solid var(--gray-200);
  border-radius: .75rem;
  padding: 1.5rem;
  background: var(--white);
  transition: border-color .15s, box-shadow .15s;
  text-decoration: none;
}

.ei-article-card:hover {
  border-color: var(--gray-400);
  box-shadow: 0 2px 8px rgba(0,0,0,.06);
}

.ei-article-card time {
  font-size: .75rem;
  color: var(--gray-400);
  font-weight: 500;
}

.ei-article-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--black);
  margin: .5rem 0 .75rem;
  line-height: 1.35;
  transition: color .15s;
}

.ei-article-card:hover h3 { color: var(--gray-600); }

.ei-article-card p {
  font-size: .875rem;
  color: var(--gray-500);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.ei-article-card .ei-read-more {
  display: block;
  margin-top: 1rem;
  font-size: .875rem;
  font-weight: 600;
  color: var(--black);
}

.ei-article-card:hover .ei-read-more { text-decoration: underline; }

/* ===== Lead magnet ===== */
.ei-lead-magnet {
  background: var(--gray-50);
  border-top: 1px solid var(--gray-200);
  border-bottom: 1px solid var(--gray-200);
  padding: 5rem 0;
}

.ei-lead-magnet .container {
  display: flex;
  align-items: center;
  gap: 3rem;
}

.ei-lm-content { flex: 1; }

.ei-lm-checklist { list-style: none; padding: 0; margin: 0 0 2rem; }

.ei-lm-checklist li {
  display: flex;
  align-items: center;
  gap: .5rem;
  font-size: .875rem;
  color: var(--gray-900);
  margin-bottom: .5rem;
}

.ei-lm-check {
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: var(--gray-200);
  color: var(--gray-600);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.ei-lm-form {
  width: 24rem;
  background: var(--white);
  border: 1px solid var(--gray-200);
  border-radius: .75rem;
  padding: 2rem;
  box-shadow: 0 2px 8px rgba(0,0,0,.04);
}

.ei-lm-form h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--black);
  margin-bottom: .25rem;
}

.ei-lm-form > p {
  font-size: .875rem;
  color: var(--gray-500);
  margin-bottom: 1.5rem;
}

.ei-lm-form label {
  display: block;
  font-size: .875rem;
  font-weight: 500;
  color: var(--gray-900);
  margin-bottom: .25rem;
}

.ei-lm-form input[type="email"] {
  width: 100%;
  border: 1px solid var(--gray-300);
  border-radius: .5rem;
  padding: .625rem 1rem;
  font-size: .875rem;
  font-family: inherit;
  margin-bottom: .75rem;
}

.ei-lm-form input:focus {
  outline: none;
  border-color: var(--black);
  box-shadow: 0 0 0 2px rgba(0,0,0,.08);
}

.ei-lm-form button {
  width: 100%;
  background: var(--black);
  color: var(--white);
  font-weight: 600;
  padding: .75rem 1.5rem;
  border-radius: .5rem;
  border: none;
  font-size: .875rem;
  cursor: pointer;
  transition: background .15s;
}

.ei-lm-form button:hover { background: var(--gray-800); }

.ei-lm-form .ei-form-note {
  font-size: .75rem;
  color: var(--gray-400);
  text-align: center;
  margin-top: .75rem;
}

/* ===== Why section ===== */
.ei-why-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2rem;
  margin-top: 3rem;
}

.ei-why-card {
  padding: 1.5rem;
  border: 1px solid var(--gray-200);
  border-radius: .75rem;
  background: var(--gray-50);
}

.ei-why-card h3 {
  font-size: 1.125rem;
  font-weight: 700;
  color: var(--black);
  margin-bottom: .75rem;
}

.ei-why-card p {
  font-size: .875rem;
  color: var(--gray-500);
  line-height: 1.6;
}

/* ===== Footer ===== */
.ei-footer {
  background: var(--gray-50);
  border-top: 1px solid var(--gray-200);
  margin-top: 5rem;
  padding: 4rem 0;
}

.ei-footer-newsletter {
  background: var(--black);
  border-radius: .75rem;
  padding: 2rem 2.5rem;
  margin-bottom: 3.5rem;
  color: var(--white);
}

.ei-footer-newsletter .ei-section-label { color: var(--gray-400); }

.ei-footer-newsletter h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin-bottom: .5rem;
}

.ei-footer-newsletter p {
  font-size: .875rem;
  color: var(--gray-400);
  margin-bottom: 1.5rem;
}

.ei-footer-form {
  display: flex;
  gap: .5rem;
  max-width: 28rem;
}

.ei-footer-form input {
  flex: 1;
  border: 1px solid var(--gray-700);
  background: var(--gray-900);
  color: var(--white);
  border-radius: .5rem;
  padding: .625rem 1rem;
  font-size: .875rem;
  font-family: inherit;
}

.ei-footer-form input::placeholder { color: var(--gray-500); }
.ei-footer-form input:focus { outline: none; border-color: var(--gray-400); }

.ei-footer-form button {
  background: var(--white);
  color: var(--black);
  font-weight: 600;
  padding: .625rem 1.25rem;
  border-radius: .5rem;
  border: none;
  font-size: .875rem;
  cursor: pointer;
  white-space: nowrap;
  transition: background .15s;
}

.ei-footer-form button:hover { background: var(--gray-200); }

.ei-footer-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2rem;
  margin-bottom: 3rem;
}

.ei-footer-heading {
  font-weight: 700;
  color: var(--black);
  margin-bottom: 1rem;
  font-size: .875rem;
}

.ei-footer-links { list-style: none; padding: 0; }
.ei-footer-links li { margin-bottom: .5rem; }
.ei-footer-links a { font-size: .875rem; color: var(--gray-500); transition: color .15s; }
.ei-footer-links a:hover { color: var(--black); }

.ei-footer-bottom {
  border-top: 1px solid var(--gray-200);
  padding-top: 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.ei-footer-bottom p { font-size: .875rem; color: var(--gray-500); }

.ei-footer-socials { display: flex; gap: 1rem; }
.ei-footer-socials a { color: var(--gray-400); transition: color .15s; }
.ei-footer-socials a:hover { color: var(--black); }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .ei-nav { display: none; }
  .ei-nav-cta { display: none; }
  .ei-mobile-toggle { display: block; }

  .ei-hero { padding: 3rem 0 4rem; }
  .ei-hero h1 { font-size: 1.75rem; }

  .ei-stats-grid { grid-template-columns: 1fr; gap: 1.5rem; }
  .ei-stats-grid > div + div { border-left: none; border-top: 1px solid var(--gray-800); padding-top: 1.5rem; }

  .ei-articles-grid { grid-template-columns: 1fr; }
  .ei-lead-magnet .container { flex-direction: column; }
  .ei-lm-form { width: 100%; }
  .ei-why-grid { grid-template-columns: 1fr; }
  .ei-footer-grid { grid-template-columns: repeat(2, 1fr); }
  .ei-footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
}