/* Brian+ Insights — Index Design System v3 (UX/UI refonte)
   Cyan-only · anti-hype · search + filter + categorization */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --bg:#050506;--bg-alt:#0a0a0c;--surface:#101014;--card:#0e0e12;
  --cyan:#00d4ff;--cyan-dim:rgba(0,212,255,.12);--cyan-glow:rgba(0,212,255,.25);
  --text:#ededef;--text-secondary:#a8a8b3;--text-dim:#7a7a85;
  --border:#1a1a22;--radius:14px;--radius-sm:8px;
  --ease:cubic-bezier(.4,0,.2,1);--ease-out:cubic-bezier(.16,1,.3,1);
}
html{scroll-behavior:smooth}
body{font-family:'Inter',system-ui,sans-serif;background:var(--bg);color:var(--text);line-height:1.65;-webkit-font-smoothing:antialiased}
body::before{content:'';position:fixed;inset:0;z-index:0;pointer-events:none;
  background:radial-gradient(ellipse 70% 40% at 50% -10%,rgba(0,212,255,.05),transparent 70%)}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible,input:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}

/* === SKIP LINK === */
.skip-link{position:absolute;top:-100px;left:1rem;background:var(--cyan);color:#000;
  padding:.6rem 1rem;border-radius:var(--radius-sm);font-weight:600;font-size:.85rem;z-index:1000;
  transition:top .2s var(--ease)}
.skip-link:focus{top:1rem}

.page{max-width:980px;margin:0 auto;padding:5rem 1.5rem 5rem;position:relative;z-index:1}

/* === HEADER === */
.index-header{margin-bottom:2.5rem}
.kicker{font-family:'JetBrains Mono',monospace;font-size:.7rem;font-weight:500;
  letter-spacing:.18em;text-transform:uppercase;color:var(--cyan);
  display:inline-block;margin-bottom:.85rem}
h1{font-family:'Bebas Neue',sans-serif;font-size:clamp(2.5rem,7vw,4rem);line-height:1;
  margin-bottom:.65rem;color:var(--text);letter-spacing:.01em}
.desc{color:var(--text-secondary);font-size:.95rem;max-width:600px;margin-bottom:1.5rem}
.header-meta{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.article-count{font-family:'JetBrains Mono',monospace;font-size:.72rem;color:var(--cyan);
  background:var(--cyan-dim);padding:.25rem .7rem;border-radius:100px;display:inline-block}
.lang-toggle{font-family:'JetBrains Mono',monospace;font-size:.72rem;font-weight:600;
  color:var(--text-secondary);border:1px solid var(--border);padding:.25rem .7rem;
  border-radius:100px;transition:.2s var(--ease)}
.lang-toggle:hover{color:var(--cyan);border-color:var(--cyan)}

/* === SEARCH === */
.search-wrap{position:relative;margin-bottom:1.25rem}
.search-input{width:100%;padding:.85rem 2.75rem .85rem 2.75rem;
  background:var(--card);border:1px solid var(--border);border-radius:100px;
  color:var(--text);font-family:'Inter',sans-serif;font-size:.9rem;
  transition:.3s var(--ease);outline:none}
.search-input::placeholder{color:var(--text-dim)}
.search-input:focus{border-color:var(--cyan);box-shadow:0 0 0 3px var(--cyan-dim)}
.search-icon{position:absolute;left:1rem;top:50%;transform:translateY(-50%);
  color:var(--text-dim);pointer-events:none}
.search-clear{position:absolute;right:.6rem;top:50%;transform:translateY(-50%);
  background:var(--surface);border:1px solid var(--border);color:var(--text-secondary);
  width:28px;height:28px;border-radius:50%;cursor:pointer;font-size:1.1rem;line-height:1;
  display:flex;align-items:center;justify-content:center;transition:.2s var(--ease)}
.search-clear:hover{background:var(--cyan-dim);color:var(--cyan);border-color:var(--cyan)}

/* === FILTER CHIPS === */
.filter-chips{display:flex;flex-wrap:wrap;gap:.5rem;margin-bottom:2.5rem}
.filter-chip{font-family:'Inter',sans-serif;font-size:.78rem;font-weight:500;
  color:var(--text-secondary);background:var(--card);border:1px solid var(--border);
  padding:.45rem .85rem;border-radius:100px;cursor:pointer;
  display:inline-flex;align-items:center;gap:.4rem;transition:.2s var(--ease)}
.filter-chip:hover{border-color:rgba(0,212,255,.3);color:var(--text)}
.filter-chip.active{background:var(--cyan-dim);border-color:var(--cyan);color:var(--cyan)}
.chip-count{font-family:'JetBrains Mono',monospace;font-size:.68rem;
  color:var(--text-dim);font-weight:600}
.filter-chip.active .chip-count{color:var(--cyan)}

.no-results{text-align:center;color:var(--text-dim);font-size:.9rem;padding:3rem 1rem}

/* === SECTIONS === */
.section-title{font-family:'Inter',sans-serif;font-size:.78rem;font-weight:700;
  letter-spacing:.14em;text-transform:uppercase;color:var(--cyan);
  margin:0 0 1.25rem;display:flex;align-items:center;gap:.5rem}
.section-icon{color:var(--cyan);font-size:.9rem}
.cornerstone-section{margin-bottom:3rem}
.all-section{margin-top:3rem}

/* === CARDS GRID === */
.cards{display:grid;grid-template-columns:repeat(2,1fr);gap:1rem}
.index-card{display:flex;flex-direction:column;background:var(--card);
  border:1px solid var(--border);border-radius:var(--radius);
  padding:1.5rem 1.75rem;transition:.3s var(--ease);position:relative;overflow:hidden}
.index-card:hover{border-color:rgba(0,212,255,.25);background:var(--surface);
  transform:translateY(-2px)}
.index-card.cornerstone{border-color:rgba(0,212,255,.18)}
.index-card.cornerstone::before{content:'';position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,transparent,var(--cyan),transparent)}

.card-meta{display:flex;align-items:center;gap:.6rem;margin-bottom:.85rem;flex-wrap:wrap}
.cat-chip{font-family:'JetBrains Mono',monospace;font-size:.62rem;font-weight:600;
  letter-spacing:.08em;text-transform:uppercase;padding:.2rem .55rem;
  border-radius:100px;border:1px solid currentColor;opacity:.85}
.cat-strategie{color:#ff6b9d}
.cat-gouvernance{color:#ffa94d}
.cat-adoption{color:#74c0fc}
.cat-frameworks{color:#00d4ff}
.cat-rex{color:#a78bfa}
.cat-tech{color:#51cf66}
.cat-societe{color:#ffd43b}
.reading-time{font-family:'JetBrains Mono',monospace;font-size:.66rem;
  color:var(--text-dim)}
.star{margin-left:auto;color:var(--cyan);font-size:.85rem;
  filter:drop-shadow(0 0 6px var(--cyan-glow))}

.card-title{font-family:'Inter',sans-serif;font-size:1rem;font-weight:600;
  margin-bottom:.55rem;color:var(--text);line-height:1.35}
.index-card.cornerstone .card-title{font-size:1.08rem}
.card-desc{font-size:.83rem;color:var(--text-secondary);line-height:1.55;
  margin-bottom:1rem;font-weight:300;flex:1;
  display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}
.card-footer{display:flex;align-items:center;justify-content:space-between;
  font-size:.72rem;color:var(--text-dim);
  padding-top:.75rem;border-top:1px solid var(--border)}
.date{font-family:'JetBrains Mono',monospace}
.read-more{color:var(--cyan);font-size:.95rem;font-weight:600;
  transition:transform .2s var(--ease)}
.index-card:hover .read-more{transform:translateX(4px)}

/* === STAGGER LOAD ANIMATION === */
@keyframes cardIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.index-card{animation:cardIn .4s var(--ease-out) backwards}
.cards .index-card:nth-child(1){animation-delay:.02s}
.cards .index-card:nth-child(2){animation-delay:.06s}
.cards .index-card:nth-child(3){animation-delay:.10s}
.cards .index-card:nth-child(4){animation-delay:.14s}
.cards .index-card:nth-child(5){animation-delay:.18s}
.cards .index-card:nth-child(6){animation-delay:.22s}
.cards .index-card:nth-child(7){animation-delay:.26s}
.cards .index-card:nth-child(8){animation-delay:.30s}
.cards .index-card:nth-child(n+9){animation-delay:.34s}

footer{padding:2rem 0;border-top:1px solid var(--border);text-align:center;
  font-size:.75rem;color:var(--text-dim);margin-top:4rem}
footer a{color:var(--cyan);transition:color .2s}footer a:hover{color:var(--text)}

/* === RESPONSIVE === */
@media(max-width:760px){
  .cards{grid-template-columns:1fr}
  .page{padding:2.5rem 1rem 3rem}
  .filter-chips{gap:.4rem}
  .filter-chip{font-size:.74rem;padding:.4rem .7rem}
  .index-card{padding:1.25rem 1.25rem}
}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation-duration:.01ms!important;animation-delay:0!important;
    transition-duration:.01ms!important}
  html{scroll-behavior:auto}
}