/* ============================================================
   MSF Premium Cleaning — feuille de style
   Référence : cadrage-msf-premium-cleaning.md (DA verrouillée)

   Règles non négociables
   - Doré #D4B052 : valeur exacte du logo. Accents graphiques
     uniquement (filets, marqueurs, traits). JAMAIS en texte sur
     fond clair — contraste ~2,2:1, illisible. Toléré en texte
     uniquement sur surface sombre (hero, footer) où il passe.
   - Fond blanc mat, profondeur par ombres douces. Pas de
     neumorphisme, pas de verre statique sur blanc (invisible).
   - backdrop-filter réservé aux éléments posés SUR la photo hero/scrim.
   - Mouvement : transform + opacity seulement, 400–600 ms,
     courbe --ease. Neutralisé par prefers-reduced-motion.
   ============================================================ */

:root {
  /* Couleurs */
  --gold:     #D4B052;
  --ink:      #14161A;
  --ink-2:    #4A5058;
  --bg:       #FAF9F7;
  --surface:  #FFFFFF;
  --line:     #E7E4DD;
  --dark:     #14161A;   /* surface sombre : hero, footer */
  --on-dark:  #FFFFFF;
  --on-dark-2: rgba(255, 255, 255, 0.78);

  /* Ombres — deux paliers, douces, multi-couches */
  --shadow-1:
    0 1px 2px rgba(20, 22, 26, 0.04),
    0 4px 12px rgba(20, 22, 26, 0.05);
  --shadow-2:
    0 2px 4px rgba(20, 22, 26, 0.05),
    0 12px 32px rgba(20, 22, 26, 0.10);

  /* Rythme */
  --wrap: 1180px;
  --pad: clamp(1.25rem, 5vw, 3.5rem);
  --section: clamp(4.5rem, 10vw, 8rem);
  --radius: 16px;
  --radius-s: 10px;

  /* Mouvement */
  --ease: cubic-bezier(0.22, 1, 0.36, 1);
  --t-fast: 220ms;
  --t-base: 480ms;
  --t-slow: 640ms;

  /* Typo — Inter, fallback système complet */
  --sans: "Inter", system-ui, -apple-system, "Segoe UI", Roboto,
          "Helvetica Neue", Arial, sans-serif;
}

/* Pas de dark mode : le site est blanc mat, point. */
html { color-scheme: light; }

/* ---------------- Base ---------------- */

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

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: clamp(1rem, 0.95rem + 0.2vw, 1.0625rem);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

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

a { color: inherit; }

h1, h2, h3 {
  margin: 0;
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: -0.02em;
  text-wrap: balance;
}

p { margin: 0; }

ul { margin: 0; padding: 0; list-style: none; }

:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 3px;
  border-radius: 3px;
}

.wrap {
  width: min(100% - 2 * var(--pad), var(--wrap));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  top: -100%;
  left: 1rem;
  z-index: 100;
  padding: 0.6rem 1rem;
  background: var(--ink);
  color: var(--on-dark);
  border-radius: var(--radius-s);
  text-decoration: none;
}
.skip-link:focus { top: 1rem; }

/* ---------------- Éléments de texte ---------------- */

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1rem;
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}
/* Filet doré : le doré comme trait, jamais comme texte sur clair */
.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: var(--gold);
  flex: none;
}
/* Sur fond sombre, le doré en texte passe le contraste */
.eyebrow--on-dark { color: var(--gold); }
.eyebrow--on-dark::before { background: var(--gold); }

.section-head { max-width: 42rem; margin-bottom: clamp(2.5rem, 5vw, 4rem); }

.section-title {
  font-size: clamp(1.75rem, 1.3rem + 2vw, 2.5rem);
}

.section-lead {
  margin-top: 1rem;
  font-size: 1.0625rem;
  color: var(--ink-2);
  max-width: 36rem;
}

/* ---------------- Boutons ---------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.6rem;
  min-height: 3rem;
  padding: 0.85rem 1.5rem;
  border: 1px solid transparent;
  border-radius: var(--radius-s);
  font: inherit;
  font-size: 0.9875rem;
  font-weight: 600;
  line-height: 1;
  text-decoration: none;
  white-space: nowrap;
  cursor: pointer;
  transition:
    transform var(--t-fast) var(--ease),
    box-shadow var(--t-base) var(--ease),
    background-color var(--t-fast) var(--ease),
    border-color var(--t-fast) var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); transition-duration: 80ms; }
.btn__icon { flex: none; }

.btn--small { min-height: 2.75rem; padding: 0.6rem 1.1rem; font-size: 0.9rem; } /* 44px : cible tactile */

/* Sur fond clair */
.btn--primary {
  background: var(--ink);
  color: var(--on-dark);
  box-shadow: var(--shadow-1);
}
.btn--primary:hover { box-shadow: var(--shadow-2); }

.btn--secondary {
  background: var(--surface);
  color: var(--ink);
  border-color: var(--line);
}
.btn--secondary:hover { border-color: var(--ink); }

/* Sur fond sombre (hero) — inversion */
.btn--on-dark.btn--primary {
  background: var(--on-dark);
  color: var(--ink);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}
.btn--on-dark.btn--primary:hover { box-shadow: 0 14px 36px rgba(0, 0, 0, 0.35); }

.btn--on-dark.btn--secondary {
  background: rgba(255, 255, 255, 0.08);
  color: var(--on-dark);
  border-color: rgba(255, 255, 255, 0.45);
  /* Posé sur la photo hero : ici le verre se voit, et c'est le seul endroit. */
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.btn--on-dark.btn--secondary:hover {
  background: rgba(255, 255, 255, 0.16);
  border-color: rgba(255, 255, 255, 0.8);
}

/* ---------------- Header ---------------- */

.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 50;
  padding-block: 1rem;
  color: var(--on-dark);
  background: transparent;
  border-bottom: 1px solid transparent;
  transition:
    background-color var(--t-base) var(--ease),
    color var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease),
    box-shadow var(--t-base) var(--ease),
    padding var(--t-base) var(--ease);
}
.site-header.is-scrolled {
  padding-block: 0.75rem;
  color: var(--ink);
  background: rgba(250, 249, 247, 0.96);
  border-bottom-color: var(--line);
  box-shadow: var(--shadow-1);
}

.site-header__inner {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.brand { text-decoration: none; }
.brand__name {
  font-weight: 600;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
}

.site-nav {
  display: flex;
  gap: 1.75rem;
  margin-left: auto;
  font-size: 0.9375rem;
  font-weight: 500;
}
.site-nav a {
  position: relative;
  text-decoration: none;
  opacity: 0.85;
  transition: opacity var(--t-fast) var(--ease);
}
.site-nav a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -6px;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base) var(--ease);
}
.site-nav a:hover { opacity: 1; }
.site-nav a:hover::after { transform: scaleX(1); }

/* Le bouton header suit l'état du header : clair sur hero, sombre après scroll */
.site-header .site-header__cta {
  background: var(--on-dark);
  color: var(--ink);
  box-shadow: none;
}
.site-header.is-scrolled .site-header__cta {
  background: var(--ink);
  color: var(--on-dark);
}

@media (max-width: 860px) {
  .site-nav { display: none; }
  .site-header__cta { margin-left: auto; }
}

/* ---------------- Hero ---------------- */

.hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  min-height: min(88vh, 860px);
  min-height: min(88svh, 860px);
  padding-block: clamp(7rem, 14vw, 9rem) clamp(3rem, 7vw, 5.5rem);
  color: var(--on-dark);
  background: var(--dark);
  overflow: hidden;
  isolation: isolate;
}

.hero__media {
  position: absolute;
  inset: 0;
  z-index: -2;
  background: var(--dark);
}
.hero__media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

/* Scrim : garantit le contraste du texte sur la photo, quel que soit
   le viewport. Plus dense en bas à gauche, là où est le texte. */
.hero__scrim {
  position: absolute;
  inset: 0;
  z-index: -1;
  background:
    linear-gradient(to top, rgba(20, 22, 26, 0.92) 0%, rgba(20, 22, 26, 0.55) 45%, rgba(20, 22, 26, 0.25) 100%),
    linear-gradient(to right, rgba(20, 22, 26, 0.55) 0%, rgba(20, 22, 26, 0) 70%);
}

.hero__content > * { max-width: 46rem; }

.hero__title {
  font-size: clamp(2.25rem, 1.5rem + 4vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.028em;
}

.hero__lead {
  margin-top: 1.25rem;
  max-width: 34rem;
  font-size: clamp(1.0625rem, 1rem + 0.4vw, 1.25rem);
  line-height: 1.5;
  color: var(--on-dark-2);
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 2rem;
}

@media (max-width: 480px) {
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; }
}

.hero__channels {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1.5rem;
  margin-top: 2.5rem;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
  font-size: 0.9375rem;
}
.hero__channels-label { color: var(--on-dark-2); }
.hero__channels a {
  position: relative;
  color: var(--on-dark);
  text-decoration: none;
  font-weight: 500;
}
.hero__channels a::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: -3px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-base) var(--ease);
}
.hero__channels a:hover::after { transform: scaleX(1); }

/* ---------------- Sections ---------------- */

.channels,
.contact { padding-block: var(--section); }

.contact { background: var(--surface); border-top: 1px solid var(--line); }

/* ---------------- Cartes canal ---------------- */

.channel-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.5rem);
}
@media (max-width: 900px) {
  .channel-grid { grid-template-columns: 1fr; max-width: 34rem; }
}

.channel {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: clamp(1.5rem, 2.5vw, 2.25rem);
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-1);
  overflow: hidden;
  transition:
    transform var(--t-base) var(--ease),
    box-shadow var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease);
}
/* Filet doré qui se trace au survol — micro-interaction, pas décor figé */
.channel::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-slow) var(--ease);
}
.channel:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-2);
  border-color: transparent;
}
.channel:hover::before { transform: scaleX(1); }

.channel__marker {
  width: 24px;
  height: 3px;
  margin-bottom: 1.5rem;
  background: var(--gold);
  border-radius: 2px;
}

.channel__title { font-size: 1.375rem; }

.channel__audience {
  margin-top: 0.375rem;
  font-size: 0.875rem;
  color: var(--ink-2);
}

.channel__text {
  margin-top: 1.25rem;
  color: var(--ink);
}

.channel__proof {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-size: 0.9375rem;
  color: var(--ink-2);
}
.channel__proof-label {
  display: block;
  margin-bottom: 0.25rem;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink);
}

.channel__cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 1.75rem;
  font-weight: 600;
  text-decoration: none;
  color: var(--ink);
}
.channel__cta-arrow {
  display: inline-block;
  transition: transform var(--t-base) var(--ease);
}
.channel__cta:hover .channel__cta-arrow { transform: translateX(4px); }

/* ---------------- Contact ---------------- */

.contact-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(1rem, 2vw, 1.5rem);
}
@media (max-width: 720px) {
  .contact-grid { grid-template-columns: 1fr; }
}

.contact-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.375rem;
  padding: clamp(1.5rem, 2.5vw, 2.25rem);
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  overflow: hidden;
  transition:
    transform var(--t-base) var(--ease),
    box-shadow var(--t-base) var(--ease),
    background-color var(--t-base) var(--ease),
    border-color var(--t-base) var(--ease);
}
.contact-card::before {
  content: "";
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--t-slow) var(--ease);
}
.contact-card:hover {
  transform: translateY(-4px);
  background: var(--surface);
  box-shadow: var(--shadow-2);
  border-color: transparent;
}
.contact-card:hover::before { transform: scaleX(1); }

.contact-card__label {
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--ink-2);
}
.contact-card__value {
  font-size: clamp(1.375rem, 1.1rem + 1.2vw, 1.875rem);
  font-weight: 600;
  letter-spacing: -0.02em;
  line-height: 1.15;
}
.contact-card__value--email {
  font-size: clamp(1.0625rem, 0.9rem + 0.9vw, 1.5rem);
  overflow-wrap: anywhere;
}
.contact-card__hint {
  margin-top: 0.5rem;
  font-size: 0.9375rem;
  color: var(--ink-2);
}

.contact__coverage {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  color: var(--ink-2);
}
.contact__coverage strong { color: var(--ink); font-weight: 600; }
.contact__coverage-text { flex: 1 1 auto; }
.contact__coverage-rule {
  flex: none;
  width: 24px;
  height: 2px;
  background: var(--gold);
}

/* ---------------- Footer ---------------- */

.site-footer {
  padding-block: clamp(2.5rem, 5vw, 4rem);
  background: var(--dark);
  color: var(--on-dark);
}
.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 2rem 3rem;
  align-items: start;
}
@media (max-width: 720px) {
  .site-footer__inner { grid-template-columns: 1fr; }
}
.site-footer__brand .brand__name { display: block; }
.site-footer__tagline {
  margin-top: 0.375rem;
  font-size: 0.9375rem;
  color: var(--on-dark-2);
}
.site-footer__links {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  font-size: 0.9375rem;
}
.site-footer__links a {
  color: var(--on-dark-2);
  text-decoration: none;
  transition: color var(--t-fast) var(--ease);
}
.site-footer__links a:hover { color: var(--on-dark); }
.site-footer__legal {
  grid-column: 1 / -1;
  padding-top: 1.5rem;
  border-top: 1px solid rgba(255, 255, 255, 0.12);
  font-size: 0.8125rem;
  color: var(--on-dark-2);
}

/* ---------------- Apparition au scroll ----------------
   Actif uniquement si le JS a posé html.js : sans JS, tout est
   visible d'emblée. Une seule fois, translation courte, fondu. */

/* `translate` (propriété individuelle) et non `transform` : le survol
   des cartes utilise `transform`, les deux ne doivent pas se marcher dessus. */
.js .reveal {
  opacity: 0;
  translate: 0 18px;
  transition:
    opacity var(--t-slow) var(--ease),
    translate var(--t-slow) var(--ease);
}
.js .reveal.is-visible {
  opacity: 1;
  translate: 0 0;
}
/* Léger décalage entre cartes voisines */
.js .channel-grid .reveal:nth-child(2) { transition-delay: 90ms; }
.js .channel-grid .reveal:nth-child(3) { transition-delay: 180ms; }
.js .contact-grid .reveal:nth-child(2) { transition-delay: 90ms; }

/* ---------------- Mouvement réduit ---------------- */

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    transition-duration: 0.01ms !important;
    transition-delay: 0ms !important;
    animation-duration: 0.01ms !important;
  }
  .js .reveal { opacity: 1; translate: 0 0; }
  .channel:hover, .contact-card:hover, .btn:hover { transform: none; }
}