:root{
  --bg:#07111f;
  --bg-2:#0b1728;
  --card:#0e1d31;
  --text:#f5f8fc;
  --muted:#9eacbd;
  --line:rgba(255,255,255,.10);
  --accent:#56d6ff;
  --accent-2:#6d7cff;
  --max:1180px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:Inter,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.6;overflow-x:hidden}
a{color:inherit;text-decoration:none}
.container{width:min(calc(100% - 48px),var(--max));margin:auto}
.site-header{position:fixed;top:0;left:0;width:100%;z-index:100;background:rgba(7,17,31,.72);backdrop-filter:blur(18px);border-bottom:1px solid transparent;transition:.3s}
.site-header.scrolled{border-color:var(--line);background:rgba(7,17,31,.92)}
.navbar{height:78px;display:flex;align-items:center;justify-content:space-between}
.brand{display:flex;align-items:center;gap:11px;font-family:"Space Grotesk",sans-serif;font-weight:700;font-size:19px;letter-spacing:.4px}
.brand b{color:var(--accent)}
.brand-mark{width:28px;height:28px;display:grid;grid-template-columns:repeat(3,1fr);gap:3px;align-items:end}
.brand-mark span{display:block;border:1px solid var(--accent);border-radius:4px 4px 2px 2px}
.brand-mark span:nth-child(1){height:55%}.brand-mark span:nth-child(2){height:85%}.brand-mark span:nth-child(3){height:68%}
.nav-links{display:flex;align-items:center;gap:26px;font-size:13px;font-weight:600}
.nav-links>a:not(.nav-cta){color:#c4cedb;transition:.2s}.nav-links>a:not(.nav-cta):hover{color:#fff}
.nav-cta{background:#fff;color:#07111f!important;padding:11px 17px;border-radius:30px}
.nav-cta span{margin-left:6px}
.menu-toggle{display:none;background:none;border:0;width:34px}.menu-toggle span{display:block;height:2px;background:#fff;margin:6px 0}
.hero{min-height:780px;position:relative;display:flex;align-items:center;overflow:hidden;padding-top:78px;background:radial-gradient(circle at 78% 45%,rgba(65,133,255,.16),transparent 32%),radial-gradient(circle at 15% 70%,rgba(36,212,255,.07),transparent 28%)}
.hero-grid{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:70px 70px;mask-image:linear-gradient(to bottom,black,transparent)}
.hero-content{position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:50px}
.hero-copy{max-width:690px}.eyebrow,.section-label{font-size:11px;letter-spacing:2.5px;font-weight:700;color:var(--accent)}
.eyebrow{display:flex;align-items:center;gap:10px;margin-bottom:22px}.eyebrow span{width:28px;height:1px;background:var(--accent)}
.hero h1{font-family:"Space Grotesk";font-size:clamp(68px,10vw,132px);line-height:.85;letter-spacing:-6px}
.hero h1 em{font-style:normal;color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.55)}
.hero h2{font-family:"Space Grotesk";font-size:clamp(28px,4vw,49px);line-height:1.04;margin:22px 0 22px;letter-spacing:-1.5px}
.hero h2 span,.section-heading h2 span,.countdown-wrap h2 span,.submit-inner h2 span{color:var(--accent)}
.hero-text{color:var(--muted);max-width:600px;font-size:16px}
.hero-meta{display:flex;gap:32px;margin:34px 0}.hero-meta>div{display:flex;align-items:center;gap:9px}.hero-meta strong{font-family:"Space Grotesk";font-size:18px}.hero-meta span{font-size:8px;line-height:1.2;color:var(--muted);letter-spacing:1.5px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-flex;align-items:center;justify-content:center;gap:14px;padding:14px 22px;border-radius:4px;font-size:12px;font-weight:700;letter-spacing:.2px;transition:.25s}.btn-primary{background:var(--accent);color:#03101b}.btn-primary:hover{transform:translateY(-3px);box-shadow:0 12px 35px rgba(86,214,255,.2)}.btn-ghost{border:1px solid var(--line);color:#d7e0ea}.btn-ghost:hover{border-color:rgba(255,255,255,.3);transform:translateY(-2px)}
.hero-badge{width:330px;height:330px;display:grid;place-items:center;border-radius:50%;background:radial-gradient(circle,rgba(86,214,255,.12),transparent 60%);border:1px solid rgba(86,214,255,.22);box-shadow:0 0 100px rgba(86,214,255,.08)}
.badge-ring{width:225px;height:225px;border:1px dashed rgba(86,214,255,.55);border-radius:50%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:7px;transform:rotate(-8deg)}
.badge-ring strong{font-family:"Space Grotesk";font-size:76px;line-height:1;color:transparent;-webkit-text-stroke:1px var(--accent)}
.badge-small{font-size:8px;letter-spacing:3px;color:var(--muted)}
.neural-art{position:absolute;right:5%;top:16%;width:520px;height:520px;opacity:.6}.node{position:absolute;width:11px;height:11px;border-radius:50%;background:var(--accent);box-shadow:0 0 18px var(--accent)}.line{position:absolute;height:1px;background:linear-gradient(90deg,transparent,var(--accent),transparent);transform-origin:left center}
.n1{left:18%;top:22%}.n2{left:42%;top:8%}.n3{left:72%;top:27%}.n4{left:33%;top:52%}.n5{left:61%;top:60%}.n6{left:82%;top:73%}.n7{left:13%;top:75%}.n8{left:52%;top:87%}
.l1{left:19%;top:23%;width:130px;transform:rotate(-18deg)}.l2{left:43%;top:9%;width:155px;transform:rotate(31deg)}.l3{left:43%;top:9%;width:225px;transform:rotate(73deg)}.l4{left:34%;top:53%;width:150px;transform:rotate(16deg)}.l5{left:62%;top:61%;width:145px;transform:rotate(22deg)}.l6{left:14%;top:76%;width:205px;transform:rotate(-21deg)}
.scroll-hint{position:absolute;bottom:25px;left:50%;transform:translateX(-50%);font-size:9px;letter-spacing:2px;color:#66768a}.scroll-hint span{display:inline-block;width:5px;height:5px;background:var(--accent);border-radius:50%;margin-right:8px}
.event-strip{border-block:1px solid var(--line);background:rgba(255,255,255,.018)}.strip-inner{min-height:85px;display:grid;grid-template-columns:repeat(3,1fr);align-items:center}.strip-inner>div{display:flex;align-items:center;gap:11px;min-height:45px;padding:0 25px;border-right:1px solid var(--line)}.strip-inner>div:first-child{padding-left:0}.strip-inner>div:last-child{border:0}.strip-icon{color:var(--accent);font-size:18px}.strip-inner b{font-size:10px;letter-spacing:1.3px}.strip-inner small{font-size:8px;color:var(--muted);letter-spacing:1px}
.section{padding:125px 0}.two-col{display:grid;grid-template-columns:1fr 1.1fr;gap:100px}.section-heading h2{font-family:"Space Grotesk";font-size:clamp(38px,5vw,62px);line-height:1.03;letter-spacing:-2.5px;margin-top:18px}.section-heading.centered{text-align:center;max-width:680px;margin:0 auto 55px}.section-heading.centered p{color:var(--muted);font-size:14px;margin-top:18px}.about-copy{padding-top:12px}.lead{font-size:22px;line-height:1.55;color:#d9e1eb;margin-bottom:24px}.about-copy>p:not(.lead){color:var(--muted);font-size:15px;max-width:610px}.info-note{display:flex;gap:15px;align-items:flex-start;border:1px solid var(--line);padding:20px;margin-top:32px;color:#dce6f0;font-size:12px}.info-note>span{color:var(--accent);font-size:20px}.info-note strong{font-size:13px}
.topics{background:var(--bg-2);border-block:1px solid var(--line)}.topic-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:14px}.topic-card{position:relative;min-height:400px;padding:30px 25px;background:rgba(255,255,255,.025);border:1px solid var(--line);overflow:hidden;transition:.3s}.topic-card:hover{transform:translateY(-7px);border-color:rgba(86,214,255,.35);background:rgba(86,214,255,.035)}.topic-number{font-size:10px;color:#617084;letter-spacing:2px}.topic-icon{font-size:35px;color:var(--accent);margin:30px 0 17px}.topic-card h3{font-family:"Space Grotesk";font-size:21px;line-height:1.15;margin-bottom:22px}.topic-card ul{list-style:none;color:var(--muted);font-size:11px}.topic-card li{padding:7px 0;border-top:1px solid rgba(255,255,255,.06)}.topic-card li:before{content:"—";color:var(--accent);margin-right:7px}
.countdown-section{padding:75px 0;background:linear-gradient(100deg,#091827,#0b1b2e)}.countdown-wrap{display:flex;justify-content:space-between;align-items:center;gap:40px}.countdown-wrap h2{font-family:"Space Grotesk";font-size:40px;margin-top:10px}.countdown{display:flex;align-items:center;gap:18px}.countdown>div{text-align:center;min-width:70px}.countdown strong{font-family:"Space Grotesk";font-size:43px;line-height:1}.countdown span{display:block;font-size:8px;letter-spacing:2px;color:var(--muted);margin-top:8px}.countdown i{font-style:normal;color:var(--accent);font-size:30px;margin-top:-18px}
.dates{background:#f3f7fb;color:#07111f}.dates .section-label{color:#3561d8}.timeline{max-width:850px;margin:65px auto 0;position:relative}.timeline:before{content:"";position:absolute;left:7px;top:7px;bottom:7px;width:1px;background:#cfd7e1}.timeline-item{position:relative;padding-left:55px;padding-bottom:47px}.date-dot{position:absolute;left:0;top:5px;width:15px;height:15px;border:4px solid #f3f7fb;background:#7b8a9b;border-radius:50%;box-shadow:0 0 0 1px #c8d1db}.timeline-item.active .date-dot,.timeline-item.final .date-dot{background:#3561d8;box-shadow:0 0 0 1px #3561d8}.date-content .date{font-size:10px;letter-spacing:2px;color:#3561d8;font-weight:800}.date-content h3{font-family:"Space Grotesk";font-size:23px;margin:5px 0}.date-content p{color:#718094;font-size:13px}
.participation-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:90px;align-items:center}.participation .section-heading p{color:var(--muted);margin-top:22px;max-width:390px}.participation-cards{display:grid;grid-template-columns:1fr 1fr;gap:12px}.participation-card{min-height:170px;padding:24px;background:var(--card);border:1px solid var(--line);display:flex;flex-direction:column;justify-content:space-between;transition:.25s}.participation-card:hover{border-color:rgba(86,214,255,.35)}.participation-card span{font-size:9px;color:var(--accent);letter-spacing:2px}.participation-card strong{font-family:"Space Grotesk";font-size:25px;line-height:1.1}.participation-card b{align-self:flex-end;color:var(--accent)}.language-card{grid-column:1/-1;border:1px solid var(--line);padding:22px;display:flex;justify-content:space-between;align-items:center}.language-card span{font-size:9px;color:var(--muted);letter-spacing:2px}.language-card strong{font-family:"Space Grotesk";font-size:17px}
.committee{background:var(--bg-2);border-block:1px solid var(--line)}


.committee-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 25px;
    align-items: stretch;
    width: 100%;
}

.person-card {
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
    padding: 30px 24px;
    min-width: 0;
    border-radius: 16px;
    height: 100%;
    box-sizing: border-box;
}

.person-card .avatar {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 70px;
    height: 70px;
    flex-shrink: 0;
    border-radius: 50%;
    margin-bottom: 18px;
}

.person-card h3 {
    margin: 12px 0;
    overflow-wrap: anywhere;
}

.person-card p {
    line-height: 1.6;
    margin-bottom: 0;
}

/* Tablettes */
@media (max-width: 900px) {
    .committee-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

/* Téléphones */
@media (max-width: 600px) {
    .committee-grid {
        grid-template-columns: 1fr;
    }
}

.submit-section{padding:110px 0;background:radial-gradient(circle at 70% 40%,rgba(86,214,255,.12),transparent 35%),#06101d}.submit-inner{display:flex;align-items:center;justify-content:space-between;gap:50px}.submit-inner h2{font-family:"Space Grotesk";font-size:clamp(38px,5vw,60px);line-height:1.03;margin:16px 0}.submit-inner p{max-width:600px;color:var(--muted);font-size:14px}.submit-action{text-align:center}.btn.big{padding:18px 28px;font-size:13px}.submit-action small{display:block;color:#6f8094;font-size:10px;margin-top:13px}
footer{background:#040b14;border-top:1px solid var(--line)}.footer-top{padding:65px 0;display:flex;justify-content:space-between;gap:50px}.footer-brand{max-width:350px}.footer-brand p{font-size:12px;color:#6f8094;margin-top:16px}.footer-info{display:flex;gap:55px}.footer-info div{display:flex;flex-direction:column;gap:7px}.footer-info span{font-size:8px;color:#5d6d80;letter-spacing:2px}.footer-info strong,.footer-info a{font-size:11px;color:#c5d0dd}.footer-bottom{border-top:1px solid var(--line);min-height:60px;display:flex;align-items:center;justify-content:space-between;color:#536276;font-size:9px}.footer-bottom a{color:#9aabba}
.reveal{opacity:0;transform:translateY(25px);transition:opacity .7s ease,transform .7s ease}.reveal.visible{opacity:1;transform:none}
@media(max-width:1000px){.nav-links{gap:15px}.topic-grid{grid-template-columns:1fr 1fr}.hero-badge{width:270px;height:270px}.badge-ring{width:185px;height:185px}.badge-ring strong{font-size:62px}.neural-art{right:-10%;opacity:.3}.participation-grid{gap:40px}}
@media(max-width:780px){
 .container{width:min(calc(100% - 32px),var(--max))}
 .navbar{height:68px}.menu-toggle{display:block}.nav-links{position:absolute;top:68px;left:16px;right:16px;display:none;flex-direction:column;align-items:stretch;background:#0a1728;border:1px solid var(--line);padding:15px}.nav-links.open{display:flex}.nav-links>a{padding:11px}.nav-cta{text-align:center}
 .hero{min-height:850px;align-items:flex-start;padding-top:130px}.hero-content{display:block}.hero-badge{display:none}.neural-art{width:400px;height:400px;right:-160px;top:45%;opacity:.25}.hero-meta{gap:18px}.hero-meta>div{align-items:flex-start;flex-direction:column;gap:2px}
 .strip-inner{grid-template-columns:1fr;gap:0;padding:12px 0}.strip-inner>div{border:0;border-bottom:1px solid var(--line);padding:12px 0!important}.strip-inner>div:last-child{border:0}
 .section{padding:85px 0}.two-col,.participation-grid{grid-template-columns:1fr;gap:40px}.topic-grid{grid-template-columns:1fr}.topic-card{min-height:auto}.countdown-wrap{display:block}.countdown{margin-top:35px;gap:7px;justify-content:space-between}.countdown strong{font-size:32px}.countdown>div{min-width:55px}.countdown i{font-size:22px}.timeline{margin-top:45px}.participation-cards{grid-template-columns:1fr}.language-card{grid-column:auto}.committee-grid{grid-template-columns:1fr}.submit-inner,.footer-top{display:block}.submit-action{margin-top:35px;text-align:left}.footer-info{display:grid;grid-template-columns:1fr 1fr;gap:25px;margin-top:35px}.footer-bottom{padding:15px 0;gap:20px;align-items:flex-start}
}
@media(max-width:420px){.hero h1{letter-spacing:-4px}.hero-meta{flex-wrap:wrap}.hero-actions .btn{width:100%}.footer-info{grid-template-columns:1fr}.countdown span{font-size:7px}}

/* Official ESM Tlemcen logo */
.school-logo{
  width:42px;
  height:42px;
  object-fit:contain;
  flex:0 0 42px;
  filter:drop-shadow(0 3px 10px rgba(0,0,0,.22));
}
.footer-brand .school-logo{
  width:48px;
  height:48px;
}
@media(max-width:780px){
  .school-logo{width:38px;height:38px;flex-basis:38px}
}

/* Additional call-for-papers content */
.detail-grid,.committee-list-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:45px;align-items:start}
.detail-card{background:var(--card, #fff);border:1px solid rgba(120,140,170,.2);border-radius:18px;padding:26px;box-shadow:0 12px 34px rgba(20,40,70,.045)}
.detail-card h3{font-family:'Space Grotesk',sans-serif;font-size:20px;margin:0 0 15px;color:var(--ink,#17233b)}
.detail-card p,.detail-card li{line-height:1.75;color:var(--muted,#596579);font-size:14px}
.detail-card p{margin:10px 0}.detail-card ul,.detail-list{padding-left:20px}.detail-card li{margin:5px 0;overflow-wrap:anywhere}.detail-card a{color:var(--accent,#1677d2);font-weight:700}
.detail-list li{margin:8px 0;line-height:1.7;color:var(--muted,#596579)}
.committee-list-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
@media(max-width:780px){.detail-grid,.committee-list-grid{grid-template-columns:1fr}.detail-card{padding:21px}}


/* Submission template download buttons */
.template-downloads {
  margin-top: 24px;
  padding-top: 20px;
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

.template-downloads h4 {
  margin-bottom: 10px;
  font-size: 1.1rem;
}

.template-downloads p {
  margin-bottom: 16px;
}

.template-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  margin: 5px 5px 5px 0;
  padding: 11px 16px;
  border-radius: 8px;
  background: #1769aa;
  color: #ffffff;
  font-size: 0.9rem;
  font-weight: 600;
  text-decoration: none;
  transition: background 0.3s ease, transform 0.3s ease;
}

.template-btn:hover {
  background: #0d4f85;
  color: #ffffff;
  transform: translateY(-2px);
}

.latex-btn {
  background: #198754;
}

.latex-btn:hover {
  background: #146c43;
}

@media (max-width: 600px) {
  .template-btn {
    display: flex;
    width: 100%;
    box-sizing: border-box;
    margin: 8px 0;
  }
}

/* Organizers and partners logos */
.partner-logos {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 28px;
  margin: 24px 0;
  flex-wrap: wrap;
}

.partner-logo {
  flex: 1 1 140px;
  max-width: 190px;
  text-align: center;
  padding: 16px 12px;
  border-radius: 12px;
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 255, 255, 0.12);
}

.partner-logo img {
  display: block;
  width: 100%;
  height: 110px;
  object-fit: contain;
  margin: 0 auto 12px;
}

.partner-logo p {
  margin: 0 0 5px;
  font-size: 0.95rem;
  font-weight: 700;
}

.partner-logo span {
  font-size: 0.82rem;
  opacity: 0.75;
}

.partner-information {
  margin-top: 20px;
}

.partner-information p {
  margin-bottom: 14px;
  line-height: 1.7;
}

@media (max-width: 480px) {
  .partner-logos {
    gap: 12px;
  }

  .partner-logo {
    flex-basis: 120px;
  }

  .partner-logo img {
    height: 90px;
  }
}


.brand {
  display: flex;
  align-items: center;
  gap: 12px;
}

.school-logo,
.lab-logo {
  width: auto;
  height: 48px;
  max-width: 100px;
  object-fit: contain;
  flex-shrink: 0;
}

.brand span {
  white-space: nowrap;
}

/* Adaptation aux petits écrans */
@media (max-width: 600px) {
  .brand {
    gap: 8px;
  }

  .school-logo,
  .lab-logo {
    height: 35px;
    max-width: 70px;
  }
}