/* ==========================================================================
   Sciences du Numérique — Custom theme CSS
   Design System: Cyberpunk Blade Runner (orange #FF6B00 / cyan #00DDFF)
   Prefix custom: sdn-
   ========================================================================== */

:root {
  --sdn-primary:   #FF6B00;
  --sdn-primary-2: #FF8533;
  --sdn-accent:    #00DDFF;
  --sdn-accent-2:  #33E5FF;
  --sdn-bg:        #0F0A1A;
  --sdn-surface:   #1A0F2A;
  --sdn-surface-2: #241638;
  --sdn-text:      #FFE5C8;
  --sdn-text-soft: #A8A0BC;
  --sdn-line:      #3A2A50;
  --sdn-line-soft: #2A1F40;
  --sdn-font-h:    'Orbitron', system-ui, sans-serif;
  --sdn-font-b:    'Rajdhani', system-ui, sans-serif;
  --sdn-radius:    10px;
  --sdn-container: 1200px;
}

/* ==========================================================================
   RESET & BASE
   ========================================================================== */

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

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

body.sdn-body {
  margin: 0;
  background: var(--sdn-bg);
  color: var(--sdn-text);
  font-family: var(--sdn-font-b);
  font-weight: 400;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

a {
  color: var(--sdn-accent);
  text-decoration: none;
  transition: color .2s ease;
}
a:hover, a:focus { color: var(--sdn-primary); }

h1, h2, h3, h4, h5, h6 {
  font-family: var(--sdn-font-h);
  font-weight: 700;
  letter-spacing: .015em;
  color: var(--sdn-text);
  line-height: 1.18;
  margin: 0 0 .8rem;
}

p { margin: 0 0 1rem; }

.sdn-container {
  width: 100%;
  max-width: var(--sdn-container);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.screen-reader-text {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0,0,0,0);
  white-space: nowrap;
  border: 0;
}
.sdn-skip-link:focus {
  position: fixed; top: 1rem; left: 1rem;
  width: auto; height: auto; clip: auto;
  background: var(--sdn-primary); color: var(--sdn-bg);
  padding: .6rem 1rem; z-index: 99999;
  font-family: var(--sdn-font-h); font-weight: 700;
}

/* ==========================================================================
   HEADER — logo-left-menu-right
   ========================================================================== */

.sdn-header {
  position: sticky; top: 0; z-index: 100;
  background: rgba(15, 10, 26, .92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--sdn-line);
}

.sdn-header-inner {
  max-width: var(--sdn-container);
  margin: 0 auto;
  padding: .85rem 1.5rem;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.sdn-brand {
  display: flex; align-items: center; gap: .7rem;
  text-decoration: none;
  flex-shrink: 0;
}
.sdn-brand-logo {
  width: auto;
  display: block;
}
.sdn-brand-name {
  font-family: var(--sdn-font-h);
  font-weight: 800;
  font-size: 1.1rem;
  color: var(--sdn-text);
  letter-spacing: .03em;
  white-space: nowrap;
}

/* DESKTOP nav (par défaut caché mobile) */
.sdn-nav-desktop { display: none; }
.sdn-nav-list {
  display: flex; gap: 1.4rem;
  list-style: none; margin: 0; padding: 0;
  align-items: center;
}
.sdn-nav-list a {
  color: var(--sdn-text);
  text-decoration: none;
  font-family: var(--sdn-font-h);
  font-weight: 500;
  font-size: .85rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  padding: .35rem .2rem;
  border-bottom: 2px solid transparent;
  transition: border-color .2s, color .2s;
  white-space: nowrap;
}
.sdn-nav-list a:hover, .sdn-nav-list a:focus {
  color: var(--sdn-accent);
  border-bottom-color: var(--sdn-accent);
}

/* Burger mobile */
.sdn-burger {
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
  width: 42px !important;
  height: 42px !important;
  min-width: 42px !important;
  min-height: 42px !important;
  padding: 8px !important;
  background: rgba(255,107,0,.15) !important;
  border: 1.5px solid var(--sdn-primary) !important;
  border-radius: 8px !important;
  color: var(--sdn-text) !important;
  cursor: pointer !important;
  z-index: 10000 !important;
  flex-shrink: 0 !important;
  position: relative !important;
  margin-left: auto !important;
}
.sdn-burger-bars {
  display: flex !important;
  flex-direction: column !important;
  gap: 4px !important;
  width: 24px !important;
  height: 16px !important;
  justify-content: center;
}
.sdn-burger-bars span {
  display: block;
  width: 100%;
  height: 2px;
  background: var(--sdn-text);
  border-radius: 1px;
}

/* ==========================================================================
   NAV MOBILE DRAWER — caché par défaut, ouvert via .is-open
   ========================================================================== */

.sdn-nav-mobile { display: none; }
.sdn-nav-mobile-overlay { display: none; }

.sdn-nav-mobile.is-open {
  display: flex;
  flex-direction: column;
  position: fixed;
  top: 0; right: 0; bottom: 0;
  width: 86%;
  max-width: 380px;
  background: #0A0612;
  padding: 4.5rem 1.5rem 2rem;
  z-index: 9999;
  overflow-y: auto;
  box-shadow: -10px 0 30px rgba(0,0,0,0.5);
  border-left: 1px solid var(--sdn-primary);
}
.sdn-nav-mobile-overlay.is-open {
  display: block;
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,.55);
  z-index: 9998;
  backdrop-filter: blur(4px);
}
.sdn-nav-mobile-close {
  position: absolute;
  top: 1rem; right: 1rem;
  width: 38px; height: 38px;
  background: transparent;
  color: var(--sdn-text);
  border: 1px solid var(--sdn-line);
  border-radius: 8px;
  cursor: pointer;
  font-size: 1.6rem;
  line-height: 1;
}
.sdn-nav-mobile-list {
  list-style: none; margin: 0; padding: 0;
  flex: 1;
}
.sdn-nav-mobile-list li { border-bottom: 1px solid var(--sdn-line); }
.sdn-nav-mobile-list a {
  display: block;
  padding: 1rem .5rem;
  color: var(--sdn-text);
  text-decoration: none;
  font-family: var(--sdn-font-h);
  font-weight: 500;
  font-size: 1rem;
  letter-spacing: .03em;
  text-transform: uppercase;
}
.sdn-nav-mobile-list a:hover, .sdn-nav-mobile-list a:focus { color: var(--sdn-accent); }

.sdn-drawer-cta {
  display: block !important;
  margin: 2rem 0 1rem !important;
  padding: 1rem 1.5rem !important;
  text-align: center !important;
  background: var(--sdn-primary) !important;
  color: var(--sdn-bg) !important;
  border-radius: 8px !important;
  font-weight: 700 !important;
  text-decoration: none !important;
  font-size: 1.05rem !important;
  font-family: var(--sdn-font-h) !important;
  letter-spacing: .04em !important;
}
@media (min-width: 1024px) {
  .sdn-drawer-cta { display: none !important; }
}

/* ==========================================================================
   HERO — zoom-on-scroll
   ========================================================================== */

.sdn-hero {
  position: relative;
  overflow: hidden;
  min-height: 78vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--sdn-bg);
}
.sdn-hero-bg {
  position: absolute; inset: 0;
  width: 100%; height: 100%;
  object-fit: cover;
  z-index: 1;
  transform: scale(1);
  transform-origin: center center;
  will-change: transform;
  transition: transform 0.05s linear;
}
/* zoom-on-scroll : agrandit l'image en fonction du scroll via CSS animation-timeline si supporté */
@supports (animation-timeline: scroll()) {
  .sdn-hero-bg {
    animation: sdn-hero-zoom linear;
    animation-timeline: view();
    animation-range: entry 0% exit 100%;
  }
  @keyframes sdn-hero-zoom {
    from { transform: scale(1); }
    to   { transform: scale(1.25); }
  }
}
.sdn-hero::after {
  content: "";
  position: absolute; inset: 0;
  background: radial-gradient(ellipse at center, transparent 30%, rgba(15,10,26,.85) 100%);
  z-index: 2;
  pointer-events: none;
}
.sdn-hero-inner {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 4rem 1.5rem;
  max-width: 900px;
}
.sdn-hero-eyebrow {
  font-family: var(--sdn-font-h);
  text-transform: uppercase;
  font-size: .8rem;
  letter-spacing: .25em;
  color: var(--sdn-accent);
  margin-bottom: 1rem;
  opacity: .92;
}
.sdn-hero-title {
  font-size: clamp(2.2rem, 6vw, 4.2rem);
  font-weight: 800;
  margin: 0 0 1.2rem;
  color: var(--sdn-text);
  text-shadow: 0 2px 12px rgba(0,0,0,.6), 0 0 30px rgba(255,107,0,.15);
}
.sdn-hero-subtitle {
  font-size: clamp(1rem, 1.8vw, 1.25rem);
  color: var(--sdn-text);
  opacity: .92;
  max-width: 640px;
  margin: 0 auto 2rem;
  line-height: 1.5;
}
.sdn-hero-cta-wrap {
  display: flex;
  gap: 1rem;
  justify-content: center;
  flex-wrap: wrap;
}

/* ==========================================================================
   BUTTONS — orange_cyber
   ========================================================================== */

.sdn-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: .6rem;
  padding: .9rem 1.7rem;
  font-family: var(--sdn-font-h);
  font-weight: 700;
  font-size: .9rem;
  letter-spacing: .06em;
  text-transform: uppercase;
  text-decoration: none;
  border-radius: 6px;
  cursor: pointer;
  transition: transform .2s ease, box-shadow .2s ease, background .2s ease, color .2s ease;
  border: 2px solid transparent;
  white-space: nowrap;
}
.sdn-btn--cta {
  background: var(--sdn-primary);
  color: var(--sdn-bg);
  box-shadow: 0 8px 24px rgba(255,107,0,.35);
}
.sdn-btn--cta:hover, .sdn-btn--cta:focus {
  background: var(--sdn-primary-2);
  color: var(--sdn-bg);
  transform: translateY(-2px);
}
.sdn-btn--ghost {
  background: transparent;
  color: var(--sdn-accent);
  border-color: var(--sdn-accent);
}
.sdn-btn--ghost:hover, .sdn-btn--ghost:focus {
  background: var(--sdn-accent);
  color: var(--sdn-bg);
}

/* ==========================================================================
   ÉDITORIAL INTRO (BLOC SEO HOME)
   ========================================================================== */

.sdn-editorial-intro {
  padding: 4rem 0 3rem;
  background: var(--sdn-bg);
  border-bottom: 1px solid var(--sdn-line-soft);
}
.sdn-editorial-intro h2.sdn-editorial-h2 {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  margin-bottom: 1.4rem;
  color: var(--sdn-text);
  text-align: center;
  position: relative;
}
.sdn-editorial-intro h2.sdn-editorial-h2::after {
  content: "";
  display: block;
  width: 70px; height: 3px;
  background: linear-gradient(90deg, var(--sdn-primary), var(--sdn-accent));
  margin: .8rem auto 0;
  border-radius: 2px;
}
.sdn-editorial-intro h3.sdn-editorial-h3 {
  font-size: 1.25rem;
  margin-top: 2rem;
  color: var(--sdn-accent);
  letter-spacing: .03em;
}
.sdn-editorial-intro p {
  color: var(--sdn-text);
  font-size: 1.05rem;
  line-height: 1.7;
  max-width: 820px;
}
.sdn-editorial-intro p.sdn-editorial-lead {
  font-size: 1.15rem;
  color: var(--sdn-text);
  margin: 0 auto 1.2rem;
  text-align: left;
  max-width: 880px;
}
.sdn-editorial-intro a { color: var(--sdn-primary); text-decoration: underline; text-underline-offset: 3px; }
.sdn-editorial-intro a:hover { color: var(--sdn-accent); }

/* ==========================================================================
   SECTION TITLES
   ========================================================================== */

.sdn-section-title {
  font-size: clamp(1.5rem, 3vw, 2rem);
  margin-bottom: 2rem;
  position: relative;
  padding-left: 1.1rem;
  color: var(--sdn-text);
}
.sdn-section-title::before {
  content: "";
  position: absolute;
  left: 0; top: 50%; transform: translateY(-50%);
  width: 5px; height: 70%;
  background: linear-gradient(180deg, var(--sdn-primary), var(--sdn-accent));
  border-radius: 3px;
}

/* ==========================================================================
   CATEGORIES GRID
   ========================================================================== */

.sdn-categories {
  padding: 4rem 0;
  background: var(--sdn-surface);
}
.sdn-cat-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.4rem;
}
.sdn-cat-card {
  display: block;
  background: var(--sdn-bg);
  border: 1px solid var(--sdn-line);
  border-radius: var(--sdn-radius);
  overflow: hidden;
  text-decoration: none;
  color: var(--sdn-text);
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
  position: relative;
}
.sdn-cat-card:hover {
  transform: translateY(-4px);
  border-color: var(--sdn-primary);
  box-shadow: 0 14px 30px rgba(255,107,0,.18);
}
.sdn-cat-card-img {
  display: block;
  width: 100%;
  height: 170px;
  object-fit: cover;
}
.sdn-cat-card-img--placeholder {
  background: linear-gradient(135deg, var(--sdn-primary) 0%, var(--sdn-accent) 100%);
}
.sdn-cat-card-body {
  padding: 1rem 1.2rem 1.2rem;
}
.sdn-cat-card-name {
  font-size: 1.15rem;
  margin: 0 0 .3rem;
  color: var(--sdn-accent);
}
.sdn-cat-card-count {
  font-size: .85rem;
  color: var(--sdn-text-soft);
  margin: 0;
  font-family: var(--sdn-font-h);
  letter-spacing: .04em;
  text-transform: uppercase;
}

/* ==========================================================================
   ARTICLES GRID
   ========================================================================== */

.sdn-latest {
  padding: 4rem 0;
  background: var(--sdn-bg);
}
.sdn-articles-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.6rem;
}
.sdn-article-card {
  background: var(--sdn-surface);
  border: 1px solid var(--sdn-line);
  border-radius: var(--sdn-radius);
  overflow: hidden;
  transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
}
.sdn-article-card:hover {
  transform: translateY(-4px);
  border-color: var(--sdn-accent);
  box-shadow: 0 14px 30px rgba(0,221,255,.15);
}
.sdn-article-card-link {
  display: block;
  text-decoration: none;
  color: inherit;
}
.sdn-article-card-thumb {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
}
.sdn-article-card-img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.sdn-article-card-body {
  padding: 1.1rem 1.3rem 1.4rem;
}
.sdn-article-card-title {
  font-size: 1.12rem;
  margin: 0 0 .5rem;
  color: var(--sdn-text);
  line-height: 1.35;
}
.sdn-article-card-meta {
  font-size: .82rem;
  color: var(--sdn-text-soft);
  margin: 0;
  font-family: var(--sdn-font-h);
  text-transform: uppercase;
  letter-spacing: .05em;
}
.sdn-empty-state {
  grid-column: 1 / -1;
  text-align: center;
  padding: 3rem 1rem;
  color: var(--sdn-text-soft);
  font-size: 1.05rem;
}
.sdn-empty-state a { color: var(--sdn-accent); }

/* ==========================================================================
   ABOUT TEASER
   ========================================================================== */

.sdn-about-teaser {
  padding: 4rem 0;
  background: var(--sdn-surface);
  border-top: 1px solid var(--sdn-line-soft);
}
.sdn-about-teaser-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  align-items: center;
}
.sdn-about-teaser-text p {
  color: var(--sdn-text);
  font-size: 1.05rem;
  line-height: 1.65;
  margin-bottom: 1.5rem;
}
.sdn-about-teaser-img img {
  width: 100%;
  max-width: 380px;
  border-radius: var(--sdn-radius);
  border: 1px solid var(--sdn-line);
  margin: 0 auto;
}
@media (min-width: 768px) {
  .sdn-about-teaser-inner {
    grid-template-columns: 1.4fr 1fr;
  }
}

/* ==========================================================================
   FOOTER — dystopia_columns
   ========================================================================== */

.sdn-footer {
  background: #07050D;
  color: #ffffff;
  padding: 4rem 0 0;
  border-top: 1px solid var(--sdn-line);
  position: relative;
}
.sdn-footer::before {
  content: "";
  position: absolute; top: 0; left: 0; right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--sdn-primary), var(--sdn-accent), var(--sdn-primary));
}
.sdn-footer-inner {
  max-width: var(--sdn-container);
  margin: 0 auto;
  padding: 0 1.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
}
@media (min-width: 768px) {
  .sdn-footer-inner {
    grid-template-columns: 1.4fr 1fr 1fr 1fr;
    gap: 2rem;
  }
}
.sdn-footer-col h3.sdn-footer-title {
  font-family: var(--sdn-font-h);
  font-size: .95rem;
  color: #ffffff;
  text-transform: uppercase;
  letter-spacing: .1em;
  margin: 0 0 1rem;
  position: relative;
  padding-bottom: .6rem;
}
.sdn-footer-col h3.sdn-footer-title::after {
  content: "";
  position: absolute;
  left: 0; bottom: 0;
  width: 40px; height: 2px;
  background: var(--sdn-primary);
}
.sdn-footer-brand-pitch {
  font-size: .95rem;
  line-height: 1.6;
  color: #ffffff;
  margin-bottom: 1.2rem;
}
.sdn-footer-brand-cta {
  display: inline-block;
  font-family: var(--sdn-font-h);
  color: #ffffff;
  text-decoration: none;
  font-size: .9rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  border-bottom: 1px solid #ffffff;
  padding-bottom: 2px;
}
.sdn-footer-brand-cta:hover { color: var(--sdn-accent); border-color: var(--sdn-accent); }
.sdn-footer-links {
  list-style: none;
  margin: 0; padding: 0;
}
.sdn-footer-links li { margin: .55rem 0; }
.sdn-footer-links a {
  color: #ffffff;
  text-decoration: none;
  font-size: .95rem;
  transition: color .2s;
}
.sdn-footer-links a:hover, .sdn-footer-links a:focus {
  color: var(--sdn-accent);
}
.sdn-footer-bottom {
  margin-top: 3rem;
  padding: 1.5rem;
  text-align: center;
  border-top: 1px solid var(--sdn-line-soft);
  color: #ffffff;
  font-size: .85rem;
  font-family: var(--sdn-font-h);
  letter-spacing: .03em;
}
.sdn-footer-bottom p { margin: 0; color: #ffffff; }
.sdn-footer-bottom a { color: #ffffff; }

/* ==========================================================================
   PERSONA PHOTO (page À propos)
   ========================================================================== */

.fa4-persona-photo,
.sdn-persona-photo {
  display: block;
  max-width: 320px;
  margin: 0 0 1.5rem;
  border-radius: var(--sdn-radius);
  border: 1px solid var(--sdn-line);
  float: left;
  margin-right: 2rem;
}
@media (max-width: 600px) {
  .fa4-persona-photo, .sdn-persona-photo {
    float: none;
    margin: 0 auto 1.5rem;
  }
}

/* ==========================================================================
   CONTACT FORM
   ========================================================================== */

.fa4-contact-form {
  margin: 2rem 0;
  background: var(--sdn-surface);
  border-radius: var(--sdn-radius);
  padding: 1rem;
  border: 1px solid var(--sdn-line);
}

/* ==========================================================================
   ANIMATIONS — CTA / CTR / CTO
   ========================================================================== */

@keyframes sdn-cta-float {
  0%, 100% { transform: translateY(0); box-shadow: 0 8px 24px rgba(255,107,0,.35); }
  50%      { transform: translateY(-6px); box-shadow: 0 14px 32px rgba(255,107,0,.55); }
}
.sdn-btn--cta { animation: sdn-cta-float 3.2s ease-in-out infinite; }

@keyframes sdn-ctr-pulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(0,221,255,.4); }
  70%      { box-shadow: 0 0 0 14px rgba(0,221,255,0); }
}
.sdn-poll-widget { animation: sdn-ctr-pulse 2.4s ease-out infinite; }

@keyframes sdn-cto-glow {
  0%, 100% { border-color: var(--sdn-primary); }
  50%      { border-color: var(--sdn-accent); }
}
.sdn-multi-step-form {
  border: 2px solid var(--sdn-primary);
  animation: sdn-cto-glow 2.8s ease-in-out infinite;
}

/* ==========================================================================
   MOUSE EFFECT — card_hover_image_brightness
   ========================================================================== */

.sdn-card { overflow: hidden; }
.sdn-card .sdn-card-img,
.sdn-card img,
.sdn-card-img-wrap {
  transition: filter .55s ease, transform .55s ease, opacity .55s ease;
  filter: brightness(.78) saturate(.85);
}
.sdn-card:hover .sdn-card-img,
.sdn-card:hover img,
.sdn-card:hover .sdn-card-img-wrap {
  filter: brightness(1.08) saturate(1.15);
  transform: scale(1.03);
}
@media (hover: none) {
  .sdn-card .sdn-card-img,
  .sdn-card img,
  .sdn-card-img-wrap {
    filter: none;
    transform: none;
  }
}

/* ==========================================================================
   MAIN PADDING ZERO (rule: no gap header→content)
   ========================================================================== */

main, .sdn-main { padding-top: 0 !important; margin-top: 0 !important; }

/* ==========================================================================
   RESPONSIVE — DESKTOP NAV VISIBLE ≥1024
   ========================================================================== */

@media (min-width: 1024px) {
  .sdn-nav-desktop {
    display: flex;
    flex: 1;
    justify-content: flex-end;
  }
  .sdn-burger { display: none !important; }
  .sdn-nav-mobile, .sdn-nav-mobile-overlay { display: none !important; }
}

@media (max-width: 1023px) {
  .sdn-nav-desktop { display: none !important; }
  .sdn-header-cta-desktop {
    display: none !important;
  }
}

/* ==========================================================================
   PRINT
   ========================================================================== */
@media print {
  .sdn-header, .sdn-footer, .sdn-hero, .sdn-burger, .sdn-nav-mobile { display: none !important; }
  body.sdn-body { background: #fff; color: #000; }
}


/* Mouse effect : card_hover_image_brightness */
.sdn-card { overflow: hidden; } .sdn-card .sdn-card-img, .sdn-card img, .sdn-card-img-wrap { transition: filter .55s ease, transform .55s ease, opacity .55s ease; filter: brightness(.78) saturate(.85); } .sdn-card:hover .sdn-card-img, .sdn-card:hover img, .sdn-card:hover .sdn-card-img-wrap { filter: brightness(1.08) saturate(1.15); transform: scale(1.03); } @media (hover: none) { .sdn-card .sdn-card-img, .sdn-card img, .sdn-card-img-wrap { filter: none; transform: none; } }