/* --- Variables --- */
:root{
  --blue: #0A2E63;
  --red: #E02020;
  --gray: #8E9196;
  --light: #F5F7FB;
  --dark: #0A0F1A;
  --container: 1100px;
}

/* --- Basic resets --- */
*{box-sizing:border-box}
html,body,#root{height:100%}
body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial;line-height:1.4;color:var(--dark);background:#fff}
.container{max-width:var(--container);margin:0 auto;padding:0 16px}

/* --- Header --- */
.site-header{border-bottom:1px solid #eef1f5;background:#fff;position:sticky;top:0;z-index:30}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand .title{font-weight:800;letter-spacing:0.3px;color:var(--blue);font-size:1.05rem}
.brand .subtitle{font-size:0.78rem;color:#6b7280}
.main-nav{display:flex;gap:18px;align-items:center}
.main-nav a{color:var(--blue);text-decoration:none;font-size:0.95rem}
.nav-toggle{display:none;background:none;border:0;font-size:1.05rem}

/* --- Hero --- */
.hero{padding:56px 0;text-align:center;background:#fff}
.hero-inner h1{font-size:2.25rem;margin:0;color:var(--blue);font-weight:800}
.lead{margin-top:10px;color:#334155;font-size:1.05rem}
.dates{color:#475569;margin-top:6px}
.hero-cta{margin-top:22px;display:flex;gap:12px;justify-content:center;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;padding:10px 16px;border-radius:12px;font-weight:600;border:1px solid transparent;text-decoration:none;cursor:pointer}
.btn-blue{background:var(--blue);color:#fff}
.btn-red{background:var(--red);color:#fff}
.btn-outline{background:transparent;border-color:var(--blue);color:var(--blue)}
.btn.full{width:100%}

/* --- Sections --- */
.section{padding:48px 0}
.section.center{text-align:center}
.section h2{font-size:1.5rem;color:var(--blue);margin-bottom:12px;font-weight:800}
.section p{color:#374151}
.hero-image{width:100%;max-width:900px;border-radius:18px;display:block;margin:18px auto;object-fit:cover}

/* Topics grid */
.topics-grid{list-style:disc;padding-left:20px;display:grid;grid-template-columns:repeat(2,minmax(20px,1fr));gap:10px}
.topics-grid li{color:#334155}

/* Dates grid */
.dates-grid{display:grid;grid-template-columns:repeat(3,minmax(200px,1fr));gap:16px}
.date-card{background:#fff;border-radius:14px;padding:18px;border:1px solid #eef1f5;box-shadow:0 4px 10px rgba(10,46,99,0.03)}
.date-card .muted{font-size:0.78rem;color:var(--gray);text-transform:uppercase}
.date-card .date{margin-top:8px;font-size:1.05rem;font-weight:800;color:var(--red)}

/* Committees */
.committees-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:16px}
.committee-card{background:#fff;border-radius:14px;padding:18px;border:1px solid #eef1f5}
.committee-card h3{color:var(--blue);margin:0 0 8px 0}
.committee-card ul{margin:0;padding-left:18px;color:#334155}

/* Submission list */
.submission-list{padding-left:18px}

/* Contact */
.contact-line{display:inline-flex;align-items:center;gap:8px;color:var(--red);font-weight:600}

/* Footer */
.site-footer{border-top:1px solid #eef1f5;padding:20px 0;background:#fff}
.footer-inner{display:flex;flex-direction:column;gap:8px;align-items:center}
.sponsor-logos{display:flex;gap:18px;align-items:center}
.sponsor-logos img{width:85px;display:block}

/* --- Modal --- */
.modal{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;padding:20px;background:rgba(0,0,0,0.45);opacity:0;pointer-events:none;transition:opacity 180ms ease}
.modal.open{opacity:1;pointer-events:auto}
.modal-dialog{background:#fff;border-radius:12px;padding:20px;width:100%;max-width:420px;box-shadow:0 12px 30px rgba(10,46,99,0.12);position:relative}
.modal-close{position:absolute;right:10px;top:8px;border:0;background:none;font-size:20px;cursor:pointer;color:var(--red)}
.reg-form{display:grid;gap:10px}
.reg-form input,.reg-form select{padding:10px;border:1px solid #e6e9ef;border-radius:8px}

/* Responsive */
@media (max-width:900px){
  .main-nav{display:none;position:absolute;top:64px;right:16px;background:#fff;padding:12px;border-radius:8px;box-shadow:0 8px 24px rgba(10,46,99,0.06);flex-direction:column}
  .main-nav.open{display:flex}
  .nav-toggle{display:block}
  .hero-inner h1{font-size:1.9rem}
}

/* small tweaks */
.muted{color:var(--gray)}
.strong{font-weight:800}

/* Base alert box */
.alert {
  padding: 14px 18px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 500;
  margin: 15px 0;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.08);
  animation: fadeIn 0.3s ease-out;
}

/* ✅ Success message */
.alert-success {
  background-color: #e6f9ed;
  color: #1e7d3b;
  border-left: 5px solid #28a745;
}

.alert-success::before {
  content: "✅";
  font-size: 18px;
}

/* ❌ Error message */
.alert-danger {
  background-color: #fdeaea;
  color: #a32424;
  border-left: 5px solid #dc3545;
}

.alert-danger::before {
  content: "⚠️";
  font-size: 18px;
}

/* Optional fade-in animation */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(-6px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Slider Section */
.slider-section {
  background: #fff;
  padding: 40px 0;
}

.slider-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
  overflow: hidden;
  border-radius: 16px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.slide {
  display: none;
}

.slide img {
  width: 100%;
  border-radius: 16px;
  vertical-align: middle;
  object-fit: cover;
  height: 500px;
}

/* Buttons */
.prev, .next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  padding: 16px;
  margin-top: -22px;
  color: white;
  font-weight: bold;
  font-size: 24px;
  border-radius: 0 3px 3px 0;
  user-select: none;
  background-color: rgba(0,0,0,0.4);
  transition: background-color 0.3s;
}

.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

.prev:hover, .next:hover {
  background-color: rgba(0,0,0,0.8);
}

/* Dots */
.dots {
  text-align: center;
  position: absolute;
  bottom: 15px;
  width: 100%;
}

.dot {
  cursor: pointer;
  height: 12px;
  width: 12px;
  margin: 0 4px;
  background-color: #ffffff;
  border-radius: 50%;
  display: inline-block;
  transition: background-color 0.3s;
}

.active, .dot:hover {
  background-color: #575757;
}

/* Fade animation */
.fade {
  animation: fadeEffect 2s ease-in-out;
}

@keyframes fadeEffect {
  from {opacity: 0.4;}
  to {opacity: 1;}
}