/* ==========================================================================
   Atelier Rive-Neuve — feuille de style unique
   Direction : catalogue éditorial. Papier chaud, filets fins, angles vifs,
   un seul accent vermillon. Aucun dégradé, aucun flou, aucun carte arrondie.
   ========================================================================== */

:root {
  /* Couleurs */
  --paper:        #F6F2EA;
  --paper-alt:    #EDE7DA;
  --ink:          #14120D;
  --ink-soft:     #57513F;
  --rule:         #D5CCB8;
  --rule-strong:  #14120D;
  /* #B23F1C : vermillon assombri pour atteindre WCAG AA (>= 4.5:1) sur les
     deux fonds, --paper (5.19) et --paper-alt (4.71), ainsi qu'en inverse. */
  --accent:       #B23F1C;
  --accent-light: #F08A5D;
  --on-ink:       #F6F2EA;

  /* Typographie */
  --f-display: "Fraunces", "Iowan Old Style", Georgia, serif;
  --f-body:    "Inter Tight", "Helvetica Neue", Arial, sans-serif;
  --f-mono:    "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, monospace;

  --t-xs:   0.75rem;
  --t-sm:   0.8125rem;
  --t-base: 1.0625rem;
  --t-md:   1.25rem;
  --t-lg:   1.5rem;

  /* Rythme */
  --gutter: clamp(1.25rem, 4vw, 3rem);
  --sec-y:  clamp(3.5rem, 9vw, 7rem);
  --max:    76rem;

  --ease: cubic-bezier(0.2, 0.6, 0.3, 1);
}

/* --------------------------------------------------------------- base --- */
*, *::before, *::after { box-sizing: border-box; }

html { scroll-behavior: smooth; scroll-padding-top: 5.5rem; }

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--f-body);
  font-size: var(--t-base);
  line-height: 1.62;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3 {
  font-family: var(--f-display);
  font-weight: 600;
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0;
  text-wrap: balance;
}

p { margin: 0; }
ul, ol, dl { margin: 0; padding: 0; }
li { list-style: none; }

a { color: inherit; }

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

:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
  border-radius: 1px;
}

.wrap {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.skip-link {
  position: absolute;
  left: 1rem;
  top: -4rem;
  z-index: 100;
  background: var(--ink);
  color: var(--on-ink);
  padding: 0.7rem 1.1rem;
  font: 500 var(--t-sm)/1 var(--f-mono);
  text-decoration: none;
  transition: top 0.18s var(--ease);
}
.skip-link:focus { top: 1rem; }

/* Champs à personnaliser : soulignement pointillé, teinté accent. */
.ph {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 0.28em;
  text-decoration-thickness: 1.5px;
}
a.ph:hover { text-decoration-style: solid; }

/* ------------------------------------------------------- barre démo --- */
#demo-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  justify-content: center;
  background: var(--ink);
  color: var(--on-ink);
  font: 400 var(--t-xs)/1.5 var(--f-mono);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  padding: 0.55rem var(--gutter);
  text-align: center;
}
#demo-bar span:first-child { color: var(--accent-light); }
.demo-sep { opacity: 0.4; }

/* --------------------------------------------------------- en-tête --- */
.site-head {
  position: sticky;
  top: 0;
  z-index: 50;
  /* Fond opaque d'abord : si color-mix n'est pas supporté, l'en-tête reste lisible. */
  background: var(--paper);
  background: color-mix(in srgb, var(--paper) 92%, transparent);
  backdrop-filter: saturate(1.4) blur(8px);
  border-bottom: 1px solid var(--rule);
}

.head-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 4.25rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
}
.brand-mark {
  display: grid;
  place-items: center;
  width: 2rem;
  height: 2rem;
  background: var(--accent);
  color: var(--paper);
  font: 500 var(--t-xs)/1 var(--f-mono);
  letter-spacing: 0.06em;
}
.brand-name {
  font-family: var(--f-display);
  font-weight: 600;
  font-size: var(--t-md);
  letter-spacing: -0.02em;
}

.site-nav { display: flex; align-items: center; gap: clamp(1rem, 2.5vw, 2.25rem); }
.site-nav ul { display: flex; gap: clamp(0.9rem, 2vw, 1.75rem); }
.site-nav a {
  font: 500 var(--t-sm)/1 var(--f-mono);
  letter-spacing: 0.06em;
  text-transform: uppercase;
  text-decoration: none;
  padding: 0.4rem 0;
  border-bottom: 2px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}
.site-nav ul a:hover,
.site-nav ul a.is-active { border-bottom-color: var(--accent); }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  background: none;
  border: 1px solid var(--rule-strong);
  color: var(--ink);
  padding: 0.5rem 0.75rem;
  font: 500 var(--t-xs)/1 var(--f-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  cursor: pointer;
}
.nav-toggle-bars { display: grid; gap: 4px; }
.nav-toggle-bars i { display: block; width: 16px; height: 2px; background: currentColor; }

/* ---------------------------------------------------------- boutons --- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.5rem;
  font: 500 var(--t-sm)/1 var(--f-mono);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  text-decoration: none;
  border: 1px solid var(--ink);
  background: none;
  color: var(--ink);
  cursor: pointer;
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease),
              transform 0.2s var(--ease), border-color 0.2s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }

.btn-solid { background: var(--ink); color: var(--on-ink); }
.btn-solid:hover { background: var(--accent); border-color: var(--accent); }

.btn-ghost:hover { background: var(--ink); color: var(--on-ink); }

.btn-accent { background: var(--accent); border-color: var(--accent); color: #FFF7F2; }
.btn-accent:hover { background: var(--ink); border-color: var(--ink); }

.btn-sm { padding: 0.65rem 1.05rem; }

.btn:disabled, .btn[aria-disabled="true"] { opacity: 0.5; pointer-events: none; }

/* ------------------------------------------------------------ héro --- */
.hero {
  border-bottom: 1px solid var(--rule-strong);
  padding-block: clamp(3rem, 8vw, 6.5rem) clamp(2.5rem, 6vw, 4.5rem);
}

.kicker {
  font: 500 var(--t-xs)/1 var(--f-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  padding-bottom: 1.15rem;
  border-bottom: 1px solid var(--rule);
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
}

.hero-title {
  font-size: clamp(3rem, 11vw, 7.5rem);
  font-weight: 600;
  letter-spacing: -0.045em;
  line-height: 0.93;
  margin-bottom: clamp(1.75rem, 4vw, 3rem);
}
.hero-title em {
  font-style: italic;
  font-weight: 400;
  color: var(--accent);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 3.5rem);
  align-items: end;
  padding-bottom: clamp(2rem, 5vw, 3.25rem);
  border-bottom: 1px solid var(--rule);
}

.lede {
  font-size: clamp(1.0625rem, 1.5vw, 1.3125rem);
  line-height: 1.55;
  color: var(--ink-soft);
  max-width: 46ch;
}
.hero-actions { display: flex; flex-wrap: wrap; gap: 0.75rem; justify-content: flex-end; }

.hero-facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(14rem, 1fr));
  gap: 1rem;
  padding-top: clamp(1.5rem, 3vw, 2.25rem);
}
.hero-facts li {
  font: 400 var(--t-sm)/1.5 var(--f-mono);
  color: var(--ink-soft);
  padding-left: 1.1rem;
  position: relative;
}
.hero-facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  background: var(--accent);
}

/* --------------------------------------------------------- sections --- */
.section { padding-block: var(--sec-y); }
.section-alt { background: var(--paper-alt); border-block: 1px solid var(--rule); }

.section-ink {
  background: var(--ink);
  color: var(--on-ink);
}
.section-ink .sec-index { color: var(--accent-light); }
.section-ink .kicker { border-color: rgba(246, 242, 234, 0.22); }

.sec-head { margin-bottom: clamp(2rem, 5vw, 3.5rem); }

.sec-index {
  font: 500 var(--t-xs)/1 var(--f-mono);
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 1rem;
}
.sec-head h2 { font-size: clamp(2.1rem, 5vw, 3.75rem); }
.sec-sub {
  margin-top: 1.1rem;
  max-width: 52ch;
  color: rgba(246, 242, 234, 0.72);
}

/* ------------------------------------------------------ prestations --- */
.services {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(16rem, 1fr));
  border-top: 1px solid var(--rule-strong);
  border-left: 1px solid var(--rule);
}
.service {
  padding: clamp(1.5rem, 3vw, 2.25rem);
  border-right: 1px solid var(--rule);
  border-bottom: 1px solid var(--rule);
  transition: background-color 0.25s var(--ease);
}
.service:hover { background: var(--paper-alt); }
.service-num {
  font: 500 var(--t-xs)/1 var(--f-mono);
  letter-spacing: 0.1em;
  color: var(--accent);
  margin-bottom: 2.5rem;
}
.service h3 { font-size: var(--t-lg); margin-bottom: 0.7rem; }
.service p { color: var(--ink-soft); font-size: var(--t-base); }

/* --------------------------------------------------------- méthode --- */
.steps {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--rule-strong);
}
.step {
  display: grid;
  grid-template-columns: 6rem minmax(0, 1fr);
  gap: clamp(1rem, 3vw, 3rem);
  padding-block: clamp(1.5rem, 3vw, 2.5rem);
  border-bottom: 1px solid var(--rule);
}
.step-num {
  font: 400 clamp(1.5rem, 3vw, 2.25rem)/1 var(--f-mono);
  color: var(--accent);
}
.step h3 { font-size: clamp(1.35rem, 2.4vw, 1.9rem); margin-bottom: 0.6rem; }
.step p { color: var(--ink-soft); max-width: 62ch; }

/* -------------------------------------------------------- à propos --- */
.about {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  gap: clamp(2rem, 5vw, 4.5rem);
  align-items: start;
}
.about-lede {
  font-family: var(--f-display);
  font-size: clamp(1.3rem, 2.2vw, 1.7rem);
  line-height: 1.35;
  margin-bottom: 1.25rem;
}
.about-text p + p { margin-top: 1rem; }
.about-text > p:not(.about-lede) { color: var(--ink-soft); max-width: 60ch; }

.about-card {
  border: 1px solid var(--rule-strong);
  background: var(--paper-alt);
  padding: clamp(1.35rem, 3vw, 2rem);
  position: sticky;
  top: 6rem;
}
.about-card dl > div { padding-block: 1rem; border-bottom: 1px solid var(--rule); }
.about-card dl > div:first-child { padding-top: 0; }
.about-card dl > div:last-child { border-bottom: 0; padding-bottom: 0; }
.about-card dt {
  font: 500 var(--t-xs)/1 var(--f-mono);
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.45rem;
}
.about-card dd { margin: 0; font-size: var(--t-base); }