/* ============================================================
   IS ON AIR — isonair.css
   Palette : blanc #FFFFFF, bleu foncé #1a3a5c, bleu moyen #2d6a9f,
             gris clair #f4f6f9, gris texte #4a5568, noir #111827
   ============================================================ */

:root {
  --ioa-blue-dark:   #1a3a5c;
  --ioa-blue-mid:    #2d6a9f;
  --ioa-blue-light:  #e8f0f8;
  --ioa-white:       #ffffff;
  --ioa-grey-bg:     #f4f6f9;
  --ioa-grey-text:   #4a5568;
  --ioa-black:       #111827;
  --ioa-border:      #dce3ed;
  --ioa-font-main:   'Inter', sans-serif;
  --ioa-font-serif:  'Playfair Display', serif;
  --ioa-radius:      6px;
  --ioa-shadow:      0 2px 16px rgba(26,58,92,0.08);
  --ioa-transition:  all 0.25s ease;
}

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

html { scroll-behavior: smooth; }

body.isonair {
  font-family: var(--ioa-font-main);
  font-size: 16px;
  line-height: 1.7;
  color: var(--ioa-black);
  background: var(--ioa-white);
  -webkit-font-smoothing: antialiased;
}

/* ── TYPOGRAPHY ── */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--ioa-font-serif);
  color: var(--ioa-blue-dark);
  line-height: 1.2;
  font-weight: 700;
}
h1 { font-size: clamp(2rem, 4vw, 3.2rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.4rem); }
h3 { font-size: clamp(1.2rem, 2vw, 1.6rem); }
h4 { font-size: 1.1rem; font-family: var(--ioa-font-main); font-weight: 600; }

p { color: var(--ioa-grey-text); margin-bottom: 1rem; }
a { color: var(--ioa-blue-mid); text-decoration: none; transition: var(--ioa-transition); }
a:hover { color: var(--ioa-blue-dark); }

/* ── BUTTONS ── */
.ioa-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--ioa-radius);
  font-family: var(--ioa-font-main);
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  cursor: pointer;
  border: 2px solid transparent;
  transition: var(--ioa-transition);
  text-decoration: none;
}
.ioa-btn--primary {
  background: var(--ioa-blue-dark);
  color: var(--ioa-white);
  border-color: var(--ioa-blue-dark);
}
.ioa-btn--primary:hover {
  background: var(--ioa-blue-mid);
  border-color: var(--ioa-blue-mid);
  color: var(--ioa-white);
}
.ioa-btn--ghost {
  background: transparent;
  color: var(--ioa-blue-dark);
  border-color: var(--ioa-blue-dark);
}
.ioa-btn--ghost:hover {
  background: var(--ioa-blue-dark);
  color: var(--ioa-white);
}
.ioa-btn--outline {
  background: transparent;
  color: var(--ioa-white);
  border-color: var(--ioa-white);
}
.ioa-btn--outline:hover {
  background: var(--ioa-white);
  color: var(--ioa-blue-dark);
}
.ioa-btn--sm { padding: 8px 20px; font-size: 0.85rem; }
.ioa-btn--full { width: 100%; justify-content: center; }

/* ── HEADER ── */
.ioa-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  background: var(--ioa-white);
  border-bottom: 1px solid var(--ioa-border);
  height: 72px;
}
.ioa-header__inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
  height: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}
.ioa-header__brand img { height: 36px; display: block; }

.ioa-nav--desktop {
  display: flex;
  align-items: center;
  gap: 28px;
  margin-left: auto;
}
.ioa-nav--desktop a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--ioa-grey-text);
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.ioa-nav--desktop a:hover,
.ioa-nav--desktop a.active {
  color: var(--ioa-blue-dark);
  border-bottom-color: var(--ioa-blue-mid);
}

.ioa-header__actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-left: 20px;
}
.ioa-iconbtn {
  width: 38px; height: 38px;
  display: flex; align-items: center; justify-content: center;
  border-radius: 50%;
  background: var(--ioa-grey-bg);
  color: var(--ioa-blue-dark);
  font-size: 0.9rem;
  transition: var(--ioa-transition);
}
.ioa-iconbtn:hover {
  background: var(--ioa-blue-dark);
  color: var(--ioa-white);
}

/* Burger & mobile nav */
.ioa-nav__toggle { display: none; }
.ioa-burger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 4px;
}
.ioa-burger span {
  display: block;
  width: 24px; height: 2px;
  background: var(--ioa-blue-dark);
  border-radius: 2px;
  transition: var(--ioa-transition);
}
.ioa-nav__overlay {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.4);
  z-index: 999;
}
.ioa-nav--mobile {
  display: none;
  position: fixed;
  top: 0; right: 0;
  width: 300px; height: 100vh;
  background: var(--ioa-white);
  z-index: 1001;
  padding: 24px;
  flex-direction: column;
  gap: 8px;
  box-shadow: -4px 0 24px rgba(0,0,0,0.12);
  overflow-y: auto;
}
.ioa-nav__mobile-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
}
.ioa-nav__title { font-weight: 700; color: var(--ioa-blue-dark); font-size: 1rem; }
.ioa-iconbtn--close { background: var(--ioa-grey-bg); font-size: 1rem; cursor: pointer; }
.ioa-nav__mobile-links { display: flex; flex-direction: column; gap: 4px; flex: 1; }
.ioa-nav__mobile-links a {
  padding: 12px 0;
  font-weight: 500;
  color: var(--ioa-black);
  border-bottom: 1px solid var(--ioa-border);
  font-size: 1rem;
}
.ioa-nav__mobile-cta { display: flex; flex-direction: column; gap: 10px; margin-top: 24px; }

.ioa-nav__toggle:checked ~ .ioa-nav__overlay { display: block; }
.ioa-nav__toggle:checked ~ .ioa-nav--mobile { display: flex; }

@media (max-width: 991px) {
  .ioa-nav--desktop { display: none; }
  .ioa-burger { display: flex; }
  .ioa-header__actions .ioa-btn--primary { display: none; }
}

/* ── MAIN OFFSET ── */
.site-main { padding-top: 72px; }

/* ── HERO ── */
.ioa-hero {
  background: var(--ioa-blue-dark);
  color: var(--ioa-white);
  padding: 100px 24px 80px;
  position: relative;
  overflow: hidden;
}
.ioa-hero::before {
  content: '';
  position: absolute;
  top: -50%; right: -20%;
  width: 600px; height: 600px;
  background: radial-gradient(circle, rgba(45,106,159,0.3) 0%, transparent 70%);
  pointer-events: none;
}
.ioa-hero__inner {
  max-width: 860px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.ioa-hero__eyebrow {
  display: inline-block;
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.6);
  margin-bottom: 20px;
}
.ioa-hero h1 {
  color: var(--ioa-white);
  font-size: clamp(2.4rem, 5vw, 4rem);
  margin-bottom: 20px;
}
.ioa-hero h1 em {
  color: #7eb8e8;
  font-style: normal;
}
.ioa-hero__sub {
  font-size: 1.15rem;
  color: rgba(255,255,255,0.75);
  margin-bottom: 12px;
  font-family: var(--ioa-font-serif);
  font-style: italic;
}
.ioa-hero__quote {
  font-size: 1rem;
  color: rgba(255,255,255,0.55);
  margin-bottom: 40px;
  font-style: italic;
}
.ioa-hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }
.ioa-hero__badges {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  margin-top: 48px;
  padding-top: 32px;
  border-top: 1px solid rgba(255,255,255,0.12);
}
.ioa-hero__badge {
  font-size: 0.82rem;
  font-weight: 500;
  color: rgba(255,255,255,0.7);
  padding: 6px 14px;
  border: 1px solid rgba(255,255,255,0.18);
  border-radius: 100px;
}

/* ── SECTIONS ── */
.ioa-section {
  padding: 80px 24px;
}
.ioa-section--grey { background: var(--ioa-grey-bg); }
.ioa-section--blue { background: var(--ioa-blue-dark); color: var(--ioa-white); }
.ioa-section--blue h2, .ioa-section--blue h3, .ioa-section--blue p { color: var(--ioa-white); }
.ioa-section--blue p { color: rgba(255,255,255,0.8); }

.ioa-container { max-width: 1100px; margin: 0 auto; }
.ioa-container--sm { max-width: 760px; margin: 0 auto; }

.ioa-section__label {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ioa-blue-mid);
  margin-bottom: 16px;
}
.ioa-section--blue .ioa-section__label { color: rgba(255,255,255,0.5); }
.ioa-section__title { margin-bottom: 16px; }
.ioa-section__intro {
  font-size: 1.1rem;
  color: var(--ioa-grey-text);
  margin-bottom: 48px;
  max-width: 680px;
}
.ioa-section--blue .ioa-section__intro { color: rgba(255,255,255,0.75); }

/* ── PHILOSOPHIE (2 colonnes) ── */
.ioa-philo {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}
.ioa-philo__quote {
  font-family: var(--ioa-font-serif);
  font-size: 1.6rem;
  font-style: italic;
  color: var(--ioa-blue-dark);
  line-height: 1.4;
  border-left: 4px solid var(--ioa-blue-mid);
  padding-left: 24px;
}
@media (max-width: 767px) {
  .ioa-philo { grid-template-columns: 1fr; gap: 32px; }
}

/* ── ÉTAPES ── */
.ioa-steps {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.ioa-step {
  background: var(--ioa-white);
  border: 1px solid var(--ioa-border);
  border-radius: var(--ioa-radius);
  padding: 32px 24px;
  position: relative;
}
.ioa-step__num {
  font-size: 2.5rem;
  font-weight: 800;
  font-family: var(--ioa-font-serif);
  color: var(--ioa-blue-light);
  line-height: 1;
  margin-bottom: 12px;
}
.ioa-step h3 { font-size: 1.05rem; margin-bottom: 10px; color: var(--ioa-blue-dark); }
.ioa-step p { font-size: 0.9rem; margin: 0; }
@media (max-width: 991px) {
  .ioa-steps { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 575px) {
  .ioa-steps { grid-template-columns: 1fr; }
}

/* ── FORMATS GRID ── */
.ioa-formats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  margin-top: 48px;
}
.ioa-format-card {
  background: var(--ioa-white);
  border: 1px solid var(--ioa-border);
  border-radius: var(--ioa-radius);
  padding: 28px 24px;
  transition: var(--ioa-transition);
}
.ioa-format-card:hover {
  border-color: var(--ioa-blue-mid);
  box-shadow: var(--ioa-shadow);
  transform: translateY(-2px);
}
.ioa-format-card__icon {
  width: 44px; height: 44px;
  background: var(--ioa-blue-light);
  border-radius: var(--ioa-radius);
  display: flex; align-items: center; justify-content: center;
  margin-bottom: 16px;
  font-size: 1.2rem;
  color: var(--ioa-blue-dark);
}
.ioa-format-card h3 {
  font-size: 1rem;
  font-family: var(--ioa-font-main);
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--ioa-blue-dark);
}
.ioa-format-card p { font-size: 0.88rem; margin: 0; }
@media (max-width: 991px) {
  .ioa-formats { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 575px) {
  .ioa-formats { grid-template-columns: 1fr; }
}

/* ── DIFFERENCIATEURS ── */
.ioa-diff {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
  border: 1px solid var(--ioa-border);
  border-radius: var(--ioa-radius);
  overflow: hidden;
  margin-top: 40px;
}
.ioa-diff__col { padding: 40px; }
.ioa-diff__col--left {
  background: var(--ioa-grey-bg);
  border-right: 1px solid var(--ioa-border);
}
.ioa-diff__col--right { background: var(--ioa-blue-dark); }
.ioa-diff__label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 20px;
  display: block;
}
.ioa-diff__col--left .ioa-diff__label { color: var(--ioa-grey-text); }
.ioa-diff__col--right .ioa-diff__label { color: rgba(255,255,255,0.5); }
.ioa-diff__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  margin-bottom: 16px;
}
.ioa-diff__item i { margin-top: 3px; flex-shrink: 0; }
.ioa-diff__col--left .ioa-diff__item i { color: var(--ioa-grey-text); }
.ioa-diff__col--right .ioa-diff__item i { color: #7eb8e8; }
.ioa-diff__item p {
  font-size: 0.92rem;
  margin: 0;
}
.ioa-diff__col--left .ioa-diff__item p { color: var(--ioa-grey-text); }
.ioa-diff__col--right .ioa-diff__item p { color: rgba(255,255,255,0.85); }
@media (max-width: 767px) {
  .ioa-diff { grid-template-columns: 1fr; }
  .ioa-diff__col--left { border-right: none; border-bottom: 1px solid var(--ioa-border); }
}

/* ── STUDIO BLOCK ── */
.ioa-studio-block {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: center;
}
.ioa-studio-block__image {
  border-radius: var(--ioa-radius);
  overflow: hidden;
  aspect-ratio: 4/3;
  background: var(--ioa-blue-light);
}
.ioa-studio-block__image img {
  width: 100%; height: 100%;
  object-fit: cover;
  display: block;
}
.ioa-studio-specs {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin: 24px 0 32px;
}
.ioa-studio-spec {
  padding: 16px;
  background: var(--ioa-grey-bg);
  border-radius: var(--ioa-radius);
}
.ioa-studio-spec__val {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--ioa-blue-dark);
  font-family: var(--ioa-font-serif);
  display: block;
}
.ioa-studio-spec__label {
  font-size: 0.8rem;
  color: var(--ioa-grey-text);
}
@media (max-width: 767px) {
  .ioa-studio-block { grid-template-columns: 1fr; gap: 32px; }
}

/* ── CTA STRIP ── */
.ioa-cta {
  background: var(--ioa-blue-dark);
  padding: 72px 24px;
  text-align: center;
}
.ioa-cta h2 { color: var(--ioa-white); margin-bottom: 16px; }
.ioa-cta p { color: rgba(255,255,255,0.75); margin-bottom: 32px; font-size: 1.05rem; }
.ioa-cta__actions { display: flex; justify-content: center; gap: 16px; flex-wrap: wrap; }

/* ── CONTACT FORM ── */
.ioa-contact {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
  margin-top: 48px;
}
.ioa-form { display: flex; flex-direction: column; gap: 20px; }
.ioa-form__group { display: flex; flex-direction: column; gap: 6px; }
.ioa-form__group label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--ioa-blue-dark);
}
.ioa-form__group input,
.ioa-form__group textarea {
  padding: 12px 16px;
  border: 1px solid var(--ioa-border);
  border-radius: var(--ioa-radius);
  font-family: var(--ioa-font-main);
  font-size: 0.95rem;
  color: var(--ioa-black);
  background: var(--ioa-white);
  transition: var(--ioa-transition);
  outline: none;
  width: 100%;
}
.ioa-form__group input:focus,
.ioa-form__group textarea:focus {
  border-color: var(--ioa-blue-mid);
  box-shadow: 0 0 0 3px rgba(45,106,159,0.12);
}
.ioa-form__group textarea { min-height: 140px; resize: vertical; }
.ioa-form__honeypot { display: none; }
.ioa-form__alert {
  padding: 14px 18px;
  border-radius: var(--ioa-radius);
  font-size: 0.92rem;
}
.ioa-form__alert--success { background: #e8f5e9; color: #2e7d32; border: 1px solid #c8e6c9; }
.ioa-form__alert--error { background: #fdecea; color: #b71c1c; border: 1px solid #f5c6c6; }
.ioa-contact__info h3 { margin-bottom: 20px; }
.ioa-contact__info p { margin-bottom: 8px; }
.ioa-contact__info a { color: var(--ioa-blue-mid); font-weight: 500; }
.ioa-contact__calendly {
  margin-top: 32px;
  padding: 24px;
  background: var(--ioa-grey-bg);
  border-radius: var(--ioa-radius);
}
.ioa-contact__calendly h4 { margin-bottom: 8px; color: var(--ioa-blue-dark); }
.ioa-contact__calendly p { font-size: 0.9rem; margin-bottom: 16px; }
@media (max-width: 767px) {
  .ioa-contact { grid-template-columns: 1fr; gap: 40px; }
}

/* ── FOOTER ── */
.ioa-footer {
  background: var(--ioa-blue-dark);
  color: var(--ioa-white);
  padding: 60px 24px 0;
}
.ioa-footer__inner { max-width: 1100px; margin: 0 auto; }
.ioa-footer__top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 48px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}
.ioa-footer__brand img { height: 32px; margin-bottom: 16px; filter: brightness(0) invert(1); }
.ioa-footer__tagline { font-style: italic; color: rgba(255,255,255,0.7); font-size: 0.95rem; margin-bottom: 12px; }
.ioa-footer__address { font-size: 0.85rem; color: rgba(255,255,255,0.5); margin-bottom: 8px; }
.ioa-footer__email, .ioa-footer__phone {
  font-size: 0.88rem;
  color: rgba(255,255,255,0.7);
  display: block;
  margin-bottom: 4px;
}
.ioa-footer__email:hover, .ioa-footer__phone:hover { color: var(--ioa-white); }
.ioa-footer h4 {
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(255,255,255,0.45);
  margin-bottom: 16px;
  font-family: var(--ioa-font-main);
}
.ioa-footer__nav ul { list-style: none; }
.ioa-footer__nav li { margin-bottom: 8px; }
.ioa-footer__nav a { color: rgba(255,255,255,0.7); font-size: 0.9rem; }
.ioa-footer__nav a:hover { color: var(--ioa-white); }
.ioa-footer__partner p { font-size: 0.88rem; color: rgba(255,255,255,0.6); margin-bottom: 16px; line-height: 1.6; }
.ioa-footer__social { display: flex; flex-direction: column; gap: 12px; }
.ioa-footer__social a { color: rgba(255,255,255,0.7); font-size: 0.9rem; display: flex; align-items: center; gap: 8px; }
.ioa-footer__social a:hover { color: var(--ioa-white); }
.ioa-footer__bottom {
  padding: 20px 0;
  text-align: center;
}
.ioa-footer__bottom p { font-size: 0.8rem; color: rgba(255,255,255,0.35); margin: 0; }
.ioa-footer__bottom a { color: rgba(255,255,255,0.5); }
.ioa-footer__bottom a:hover { color: var(--ioa-white); }

@media (max-width: 991px) {
  .ioa-footer__top { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 575px) {
  .ioa-footer__top { grid-template-columns: 1fr; }
}

/* ── PAGE HEADER INTERNE ── */
.ioa-page-hero {
  background: var(--ioa-blue-dark);
  padding: 64px 24px 56px;
  text-align: center;
}
.ioa-page-hero h1 { color: var(--ioa-white); margin-bottom: 12px; }
.ioa-page-hero p { color: rgba(255,255,255,0.7); font-size: 1.05rem; max-width: 600px; margin: 0 auto; }

/* ── ALERT ── */
.ioa-alert {
  padding: 14px 18px;
  border-radius: var(--ioa-radius);
  font-size: 0.92rem;
  margin-bottom: 24px;
}
.ioa-alert--success { background: #e8f5e9; color: #2e7d32; border: 1px solid #c8e6c9; }
.ioa-alert--error { background: #fdecea; color: #b71c1c; border: 1px solid #f5c6c6; }

/* ── DIVIDER ── */
.ioa-divider { border: none; border-top: 1px solid var(--ioa-border); margin: 0; }

/* ── UTILS ── */
.ioa-text-center { text-align: center; }
.ioa-mt-48 { margin-top: 48px; }
.ioa-mb-0 { margin-bottom: 0; }