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

:root{
  --primary-50:#eef6ff;
  --primary-100:#dbeafe;
  --primary-200:#bfdbfe;
  --primary-300:#93c5fd;
  --primary-400:#60a5fa;
  --primary-500:#3b82f6;
  --primary-600:#2563eb;
  --primary-700:#1d4ed8;
  --primary-800:#1e40af;
  --primary-900:#0b1f3a;

  --accent-50:#fff7ed;
  --accent-100:#ffedd5;
  --accent-200:#fed7aa;
  --accent-300:#fdba74;
  --accent-400:#fb923c;
  --accent-500:#f97316;
  --accent-600:#f36f21;
  --accent-700:#c2410c;

  --teal-400:#22d3ee;
  --teal-500:#06b6d4;

  --slate-50:#f8fafc;
  --slate-100:#f1f5f9;
  --slate-200:#e2e8f0;
  --slate-300:#cbd5e1;
  --slate-400:#94a3b8;
  --slate-500:#64748b;
  --slate-600:#475569;
  --slate-700:#334155;
  --slate-800:#1e293b;
  --slate-900:#0f172a;

  --red-600:#dc2626;
}

body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","Roboto","Oxygen","Ubuntu","Cantarell",sans-serif;
  line-height:1.6;
  color:var(--slate-700);
  background:linear-gradient(135deg,var(--slate-50) 0%,var(--primary-50) 55%,var(--accent-50) 100%);
  min-height:100vh;
}

.visually-hidden{
  position:absolute!important;
  height:1px;width:1px;
  overflow:hidden;
  clip:rect(1px,1px,1px,1px);
  white-space:nowrap;
}

.navbar{
  position:fixed;
  width:100%;
  background-color:rgba(255,255,255,.92);
  backdrop-filter:blur(10px);
  z-index:1000;
  box-shadow:0 1px 3px rgba(0,0,0,.1);
  border-bottom:1px solid var(--primary-100);
  transition:background-color .3s ease;
}

.nav-container{
  max-width:1280px;
  margin:0 auto;
  padding:0 1rem;
  display:flex;
  justify-content:space-between;
  align-items:center;
  height:64px;
  position:relative;
}

.nav-back-btn{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  color:var(--accent-600);
  text-decoration:none;
  font-weight:700;
  transition:transform .2s ease, background-color .2s ease;
  padding:.5rem 1rem;
  border-radius:.6rem;
}
.nav-back-btn:hover{
  background-color:var(--accent-50);
  transform:translateX(-4px);
}

.nav-brand{
  display:flex;
  align-items:center;
  gap:.5rem;
  font-size:1.25rem;
  font-weight:900;
  background:linear-gradient(to right,var(--primary-800),var(--accent-600));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
  position:absolute;
  left:50%;
  transform:translateX(-50%);
}

.icon-nav{width:24px;height:24px;color:var(--accent-600)}

.nav-links{display:none;gap:2rem;align-items:center}
.nav-link{
  color:var(--slate-700);
  text-decoration:none;
  font-weight:700;
  transition:color .2s ease;
}
.nav-link:hover{color:var(--accent-600)}

.mobile-menu-btn{display:block;background:none;border:none;cursor:pointer;color:var(--slate-700)}

.mobile-menu{
  position:fixed;
  top:64px;left:0;right:0;
  background:#fff;
  border-top:1px solid var(--primary-100);
  box-shadow:0 10px 16px rgba(0,0,0,.12);
  transform:translateY(-100%);
  opacity:0;
  transition:transform .25s ease, opacity .25s ease;
  z-index:999;
  max-height:calc(100vh - 64px);
  overflow-y:auto;
}
.mobile-menu.active{transform:translateY(0);opacity:1}
.mobile-link{
  display:block;
  padding:1rem 1.5rem;
  color:var(--slate-700);
  text-decoration:none;
  font-weight:700;
  transition:background-color .2s ease;
}
.mobile-link:hover{background-color:var(--primary-50)}

@media (min-width:768px){
  .nav-links{display:flex}
  .mobile-menu-btn{display:none}
  .mobile-menu{display:none}
  .nav-brand{position:static;transform:none}
}

@media (max-width:767px){
  .nav-brand{display:none}
}

.project-hero{
  padding:8rem 1rem 4rem;
  background:linear-gradient(135deg,var(--primary-50),var(--accent-50));
  border-bottom:2px solid var(--primary-100);
}

.project-hero-content{
  max-width:1280px;
  margin:0 auto;
  text-align:center;
}

.project-badge{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  background:linear-gradient(135deg,var(--primary-800),var(--accent-600));
  color:#fff;
  padding:.5rem 1rem;
  border-radius:.6rem;
  font-size:.85rem;
  font-weight:900;
  text-transform:uppercase;
  letter-spacing:.5px;
  margin-bottom:1.25rem;
}
.project-badge i{width:18px;height:18px}

.project-hero-title{
  font-size:2.6rem;
  font-weight:900;
  margin-bottom:.75rem;
  color:var(--slate-800);
  background:linear-gradient(to right,var(--primary-900),var(--primary-700),var(--accent-600));
  -webkit-background-clip:text;
  -webkit-text-fill-color:transparent;
  background-clip:text;
}

@media (min-width:768px){
  .project-hero-title{font-size:3.6rem}
}

.project-hero-subtitle{
  font-size:1.15rem;
  color:var(--slate-600);
  max-width:58rem;
  margin:0 auto 1.5rem;
  line-height:1.7;
}

.project-meta{
  display:flex;
  flex-wrap:wrap;
  gap:1.25rem;
  justify-content:center;
  align-items:center;
  margin-bottom:1.75rem;
}
.meta-item{
  display:flex;
  align-items:center;
  gap:.5rem;
  color:var(--slate-600);
  font-size:.98rem;
  padding:.55rem .8rem;
  background:rgba(255,255,255,.75);
  border:1px solid var(--primary-100);
  border-radius:.75rem;
  box-shadow:0 8px 14px rgba(15,23,42,.06);
}
.meta-item i{width:18px;height:18px;color:var(--accent-600)}

.hero-cta{
  display:flex;
  flex-direction:column;
  gap:1rem;
  justify-content:center;
  align-items:center;
}
@media (min-width:640px){
  .hero-cta{flex-direction:row}
}

.btn-primary{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  background:linear-gradient(to right,var(--primary-800),var(--accent-600));
  color:#fff;
  padding:.85rem 1.8rem;
  border-radius:.65rem;
  font-weight:900;
  text-decoration:none;
  transition:transform .2s ease, box-shadow .2s ease, filter .2s ease;
  box-shadow:0 12px 20px rgba(0,0,0,.12);
}
.btn-primary:hover{
  transform:scale(1.04);
  filter:brightness(1.03);
  box-shadow:0 18px 28px rgba(0,0,0,.16);
}

.btn-secondary{
  display:inline-block;
  padding:.83rem 1.8rem;
  border:2px solid var(--primary-800);
  color:var(--primary-800);
  border-radius:.65rem;
  font-weight:900;
  text-decoration:none;
  transition:background-color .2s ease, transform .2s ease;
}
.btn-secondary:hover{
  background-color:var(--primary-50);
  transform:translateY(-1px);
}

.section{padding:5rem 1rem}
.section-white{background:#fff}

.container{max-width:56rem;margin:0 auto}
.container-wide{max-width:1280px;margin:0 auto}

.section-title{
  font-size:2.25rem;
  font-weight:900;
  text-align:center;
  margin-bottom:2.25rem;
  color:var(--slate-800);
  display:flex;
  align-items:center;
  justify-content:center;
  gap:.75rem;
}
.icon-title{width:40px;height:40px;color:var(--accent-600)}

.overview-card{
  background:linear-gradient(135deg,var(--primary-50),var(--accent-50));
  border-radius:1rem;
  padding:2rem;
  border:1px solid var(--primary-100);
  box-shadow:0 12px 18px rgba(0,0,0,.1);
}

.overview-lead{
  font-size:1.05rem;
  color:var(--slate-700);
  line-height:1.75;
  margin-bottom:1.5rem;
}

.quick-grid{
  display:grid;
  gap:1rem;
  grid-template-columns:1fr;
}
@media (min-width:720px){
  .quick-grid{grid-template-columns:repeat(2,1fr)}
}
@media (min-width:1024px){
  .quick-grid{grid-template-columns:repeat(3,1fr)}
}
.quick-item{
  background:#fff;
  border:1px solid var(--primary-100);
  border-radius:1rem;
  padding:1.25rem;
  box-shadow:0 10px 16px rgba(15,23,42,.06);
}
.quick-top{
  display:flex;
  align-items:center;
  gap:.65rem;
  margin-bottom:.35rem;
}
.quick-top i{width:20px;height:20px;color:var(--accent-600)}
.quick-top h3{font-size:1.05rem;font-weight:900;color:var(--slate-800)}
.quick-item p{color:var(--slate-600);line-height:1.65}

.evidence-card{
  margin-top:2rem;
  background:#fff;
  border:2px solid var(--primary-100);
  border-radius:1rem;
  padding:2rem;
  box-shadow:0 12px 18px rgba(0,0,0,.08);
}

.evidence-title{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:.6rem;
  font-size:1.35rem;
  font-weight:900;
  color:var(--slate-800);
  margin-bottom:1.25rem;
}
.evidence-title i{width:22px;height:22px;color:var(--accent-600)}

.evidence-grid{
  display:grid;
  gap:1rem;
  grid-template-columns:1fr;
}
@media (min-width:900px){
  .evidence-grid{grid-template-columns:repeat(2,1fr)}
}
.evidence-block{
  border:1px solid var(--primary-100);
  border-radius:1rem;
  padding:1.25rem;
  background:linear-gradient(135deg,var(--slate-50),var(--primary-50));
}
.evidence-block h4{
  font-size:1.05rem;
  font-weight:900;
  color:var(--slate-800);
  margin-bottom:.6rem;
}
.evidence-list{list-style:none;padding:0}
.evidence-list li{
  position:relative;
  padding-left:1.25rem;
  margin-bottom:.55rem;
  color:var(--slate-600);
  line-height:1.6;
}
.evidence-list li::before{
  content:"→";
  position:absolute;
  left:0;
  color:var(--accent-600);
  font-weight:900;
}

.code-card{
  margin-top:1.25rem;
  border:1px solid var(--primary-100);
  border-radius:1rem;
  overflow:hidden;
}
.code-head{
  display:flex;
  align-items:center;
  gap:.5rem;
  padding:.85rem 1rem;
  background:linear-gradient(135deg,var(--primary-800),var(--accent-600));
  color:#fff;
  font-weight:900;
}
.code-head i{width:18px;height:18px}
.code{
  background:#0b1220;
  color:#e5e7eb;
  padding:1rem;
  overflow:auto;
  font-size:.92rem;
  line-height:1.55;
}

.demo-grid{
  display:grid;
  gap:1.5rem;
  grid-template-columns:1fr;
}
.demo-card{
  background:#fff;
  border-radius:1rem;
  border:2px solid var(--primary-100);
  box-shadow:0 10px 18px rgba(0,0,0,.08);
  overflow:hidden;
}
.demo-header{padding:1.5rem}
.demo-badge{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  background:linear-gradient(135deg,var(--primary-800),var(--accent-600));
  color:#fff;
  padding:.35rem .75rem;
  border-radius:.6rem;
  font-size:.82rem;
  font-weight:900;
  text-transform:uppercase;
  letter-spacing:.4px;
  margin-bottom:.75rem;
}
.demo-badge i{width:18px;height:18px}
.demo-title{
  font-size:1.45rem;
  font-weight:900;
  color:var(--slate-800);
  margin-bottom:.5rem;
}
.demo-text{
  color:var(--slate-600);
  line-height:1.75;
  max-width:60rem;
}

.media-frame{
  padding:0 1.5rem 1.25rem;
}
.demo-video{
  width:100%;
  border-radius:1rem;
  border:1px solid var(--primary-100);
  box-shadow:0 12px 20px rgba(15,23,42,.10);
  background:#000;
}
.media-caption{
  margin-top:.65rem;
  text-align:center;
  color:var(--slate-500);
  font-size:.92rem;
}

.demo-points{
  display:flex;
  flex-wrap:wrap;
  gap:.6rem;
  padding:0 1.5rem 1.5rem;
}
.pill{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.45rem .75rem;
  background:var(--primary-50);
  border:1px solid var(--primary-200);
  border-radius:9999px;
  color:var(--primary-800);
  font-weight:800;
  font-size:.86rem;
}
.pill i{width:18px;height:18px;color:var(--accent-600)}

.quat-grid{
  display:grid;
  gap:1rem;
  grid-template-columns:1fr;
  padding:0 1.5rem 1.5rem;
}
@media (min-width:900px){
  .quat-grid{grid-template-columns:repeat(3,1fr)}
}
.quat-card{
  background:linear-gradient(135deg,var(--slate-50),var(--primary-50));
  border:1px solid var(--primary-100);
  border-radius:1rem;
  padding:1.1rem;
}
.quat-head{
  display:flex;
  align-items:center;
  gap:.55rem;
  font-weight:900;
  color:var(--slate-800);
  margin-bottom:.45rem;
}
.quat-head i{width:18px;height:18px;color:var(--accent-600)}
.quat-math{
  font-family:ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace;
  color:var(--slate-700);
  margin-bottom:.25rem;
}
.quat-sub{color:var(--slate-600);font-size:.95rem}

.arch-wrap{
  display:block;
}
.arch-top {
  margin-bottom: 2.5rem;
}

.arch-bottom {
  margin-top: 2rem;
}

/* Give wide Simulink images the full usable width */
.figure-wide img {
  width: 100%;
  height: auto;
}

/* If your figure class has max-width constraints elsewhere, force wide figures to ignore them */
.figure.figure-wide {
  max-width: none;
}

/* Make the tab system span full width inside container-wide */
.tabs-wide {
  width: 100%;
}

/* Optional: slightly reduce the sidebar width so the panel gets more space on desktop */
@media (min-width: 1024px) {
  .tabs-wide .tab-list {
    width: 260px;
  }
}
@media (min-width:1024px){
  .arch-wrap{grid-template-columns:1.05fr .95fr;align-items:start}
}

.arch-title{
  font-size:1.35rem;
  font-weight:900;
  color:var(--slate-800);
  margin-bottom:.5rem;
}
.arch-text{color:var(--slate-600);line-height:1.75;margin-bottom:1rem}

.figure{margin:0}
.figure img{
  width:100%;
  height:auto;
  border-radius:1rem;
  box-shadow:0 12px 20px rgba(0,0,0,.10);
  border:1px solid var(--primary-100);
  display:block;
}
.figure-caption{
  margin-top:.65rem;
  text-align:center;
  color:var(--slate-500);
  font-size:.92rem;
}
.figure-tight img{box-shadow:0 10px 18px rgba(0,0,0,.09)}

.tabs{
  display:grid;
  gap:1rem;
  grid-template-columns:1fr;
  background:linear-gradient(135deg,var(--slate-50),var(--primary-50));
  border:1px solid var(--primary-100);
  border-radius:1rem;
  padding:1rem;
}

@media (min-width:900px){
  .tabs{
    grid-template-columns:280px 1fr;
    gap:1.25rem;
  }
}

.tab-radio{position:absolute;opacity:0;pointer-events:none}

.tab-list{
  display:flex;
  flex-direction:row;
  gap:.5rem;
  overflow:auto;
  padding-bottom:.25rem;
}
@media (min-width:900px){
  .tab-list{
    flex-direction:column;
    overflow:visible;
    padding-bottom:0;
  }
}

.tab-item{
  display:flex;
  align-items:center;
  gap:.6rem;
  padding:.8rem .85rem;
  border-radius:.85rem;
  border:1px solid var(--primary-100);
  background:#fff;
  cursor:pointer;
  user-select:none;
  transition:transform .16s ease, border-color .16s ease, box-shadow .16s ease;
  min-width:220px;
  box-shadow:0 8px 14px rgba(15,23,42,.06);
}
@media (min-width:900px){
  .tab-item{min-width:auto}
}
.tab-item:hover{
  transform:translateY(-1px);
  border-color:var(--accent-300);
  box-shadow:0 12px 18px rgba(15,23,42,.10);
}
.tab-icon i{width:18px;height:18px;color:var(--accent-600)}
.tab-text{font-weight:900;color:var(--slate-800);font-size:.98rem}

.tab-item-plant .tab-icon i{color:var(--teal-500)}

.tab-panels{
  background:#fff;
  border:1px solid var(--primary-100);
  border-radius:1rem;
  padding:1.25rem;
  box-shadow:0 10px 16px rgba(15,23,42,.06);
}

.tab-panel{display:none}
.panel-head h4{
  font-size:1.2rem;
  font-weight:900;
  color:var(--slate-800);
  margin-bottom:.35rem;
}
.panel-head p{color:var(--slate-600);line-height:1.7;margin-bottom:1rem}

#tab-plant:checked ~ .tab-panels #panel-plant{display:block}
#tab-actuator:checked ~ .tab-panels #panel-actuator{display:block}
#tab-sensors:checked ~ .tab-panels #panel-sensors{display:block}
#tab-estimator:checked ~ .tab-panels #panel-estimator{display:block}
#tab-controller:checked ~ .tab-panels #panel-controller{display:block}
#tab-scenario:checked ~ .tab-panels #panel-scenario{display:block}
#tab-orbit:checked ~ .tab-panels #panel-orbit{display:block}

#tab-plant:checked ~ .tab-list label[for="tab-plant"],
#tab-actuator:checked ~ .tab-list label[for="tab-actuator"],
#tab-sensors:checked ~ .tab-list label[for="tab-sensors"],
#tab-estimator:checked ~ .tab-list label[for="tab-estimator"],
#tab-controller:checked ~ .tab-list label[for="tab-controller"],
#tab-scenario:checked ~ .tab-list label[for="tab-scenario"],
#tab-orbit:checked ~ .tab-list label[for="tab-orbit"]{
  border-color:var(--accent-400);
  box-shadow:0 16px 22px rgba(15,23,42,.12);
  background:linear-gradient(135deg,var(--primary-50),var(--accent-50));
}

.deriv-card{
  background:#fff;
  border:2px solid var(--primary-100);
  border-radius:1rem;
  padding:2rem;
  box-shadow:0 12px 18px rgba(0,0,0,.08);
}
.deriv-lead{
  color:var(--slate-700);
  line-height:1.75;
  margin-bottom:1.5rem;
  font-size:1.05rem;
}
.deriv-step{
  padding:1.25rem 0;
  border-top:1px solid var(--primary-100);
}
.deriv-step:first-of-type{border-top:0;padding-top:0}
.deriv-title{
  font-size:1.35rem;
  font-weight:900;
  color:var(--slate-800);
  margin-bottom:.5rem;
}
.deriv-text{
  color:var(--slate-600);
  line-height:1.75;
  margin-bottom:.75rem;
}
.math-block{
  background:linear-gradient(135deg,var(--slate-50),var(--primary-50));
  border:1px solid var(--primary-100);
  border-radius:1rem;
  padding:1rem;
  margin:.85rem 0 1rem;
  overflow:auto;
}

.deriv-callout{
  display:flex;
  gap:1rem;
  align-items:flex-start;
  background:linear-gradient(135deg,var(--primary-50),var(--accent-50));
  border:1px solid var(--primary-100);
  border-radius:1rem;
  padding:1rem;
  margin-top:1rem;
}
.callout-icon{
  width:44px;height:44px;
  border-radius:.9rem;
  background:linear-gradient(135deg,var(--primary-800),var(--accent-600));
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
  box-shadow:0 10px 18px rgba(15,23,42,.12);
}
.callout-icon i{width:22px;height:22px;color:#fff}
.callout-title{font-weight:900;color:var(--slate-800);margin-bottom:.25rem}
.callout-text p{color:var(--slate-600);line-height:1.7}

.deriv-images{margin-top:1.25rem}
.gallery-3{
  display:grid;
  gap:1rem;
  grid-template-columns:1fr;
  margin-top:1rem;
}
@media (min-width:900px){
  .gallery-3{grid-template-columns:repeat(3,1fr)}
}
.gallery-item{
  background:#fff;
  border:1px solid var(--primary-100);
  border-radius:1rem;
  overflow:hidden;
  box-shadow:0 10px 18px rgba(15,23,42,.08);
}
.gallery-item img{
  width:100%;
  height:auto;
  display:block;
}
.gallery-item .figure-caption{
  padding:1rem;
  margin:0;
}

.val-grid{
  display:grid;
  gap:1.5rem;
  grid-template-columns:1fr;
}
@media (min-width:1024px){
  .val-grid{grid-template-columns:repeat(3,1fr)}
}
.val-card{
  background:#fff;
  border:2px solid var(--primary-100);
  border-radius:1rem;
  padding:1.5rem;
  box-shadow:0 10px 18px rgba(0,0,0,.08);
}
.val-head{
  display:flex;
  align-items:center;
  gap:.6rem;
  margin-bottom:.6rem;
}
.val-head i{width:22px;height:22px;color:var(--accent-600)}
.val-head h3{font-size:1.2rem;font-weight:900;color:var(--slate-800)}
.val-card p{color:var(--slate-600);line-height:1.75;margin-bottom:.9rem}

.checklist{list-style:none;padding:0}
.checklist li{
  display:flex;
  gap:.6rem;
  align-items:flex-start;
  padding:.55rem 0;
  border-top:1px solid rgba(0,0,0,.05);
  color:var(--slate-600);
}
.checklist li:first-child{border-top:0}

.check{
  width:26px;height:26px;
  border-radius:.6rem;
  display:flex;
  align-items:center;
  justify-content:center;
  flex-shrink:0;
}
.check i{width:16px;height:16px;color:#fff}
.check.ok{background:linear-gradient(135deg,var(--primary-800),var(--teal-500))}
.check.info{background:linear-gradient(135deg,var(--primary-700),var(--primary-900))}
.check.warn{background:linear-gradient(135deg,var(--accent-600),var(--red-600))}

.val-note{
  margin-top:1.5rem;
  display:flex;
  gap:.6rem;
  align-items:flex-start;
  justify-content:center;
  text-align:center;
  color:var(--slate-600);
}
.val-note i{width:20px;height:20px;color:var(--accent-600);margin-top:.15rem}

.roadmap{
  display:grid;
  gap:1.25rem;
  grid-template-columns:1fr;
}
@media (min-width:900px){
  .roadmap{grid-template-columns:repeat(2,1fr)}
}
.road-card{
  background:#fff;
  border:2px solid var(--primary-100);
  border-radius:1rem;
  padding:1.5rem;
  box-shadow:0 10px 18px rgba(0,0,0,.08);
}
.road-head{
  display:flex;
  align-items:center;
  gap:.6rem;
  margin-bottom:.65rem;
}
.road-head i{width:22px;height:22px;color:var(--accent-600)}
.road-head h3{font-size:1.2rem;font-weight:900;color:var(--slate-800)}
.road-list{list-style:none;padding:0}
.road-list li{
  position:relative;
  padding-left:1.25rem;
  margin:.6rem 0;
  color:var(--slate-600);
  line-height:1.7;
}
.road-list li::before{
  content:"→";
  position:absolute;
  left:0;
  color:var(--accent-600);
  font-weight:900;
}

.contact-section{
  position:relative;
  background:linear-gradient(135deg,var(--primary-900) 0%,var(--primary-700) 55%,var(--accent-600) 100%);
  overflow:hidden;
  text-align:center;
}
.contact-glow{
  position:absolute;
  inset:0;
  background:
    radial-gradient(circle at 30% 50%, rgba(6,182,212,.22) 0%, transparent 55%),
    radial-gradient(circle at 70% 50%, rgba(243,111,33,.22) 0%, transparent 55%);
  animation:glow-pulse 4s ease-in-out infinite;
  pointer-events:none;
}
@keyframes glow-pulse{
  0%,100%{opacity:.55}
  50%{opacity:1}
}
.contact-container{position:relative;z-index:1}
.contact-title{
  color:#fff;
  font-size:2.6rem;
  font-weight:900;
  text-shadow:0 4px 12px rgba(0,0,0,.3);
  margin-bottom:.5rem;
}
.contact-subtitle{
  text-align:center;
  font-size:1.15rem;
  color:rgba(255,255,255,.95);
  margin:0 auto 1.25rem;
  max-width:52rem;
  text-shadow:0 2px 8px rgba(0,0,0,.2);
}
.contact-links{
  display:flex;
  flex-direction:column;
  gap:1rem;
  align-items:stretch;
}
@media (min-width:640px){
  .contact-links{flex-direction:row;justify-content:center;align-items:center}
}
.contact-card{
  display:flex;
  align-items:center;
  justify-content:center;
  gap:.75rem;
  background:#fff;
  padding:1rem 2rem;
  border-radius:.75rem;
  transition:transform .25s ease, border-color .25s ease, background-color .25s ease, box-shadow .25s ease;
  border:3px solid #fff;
  text-decoration:none;
  color:var(--slate-700);
  font-weight:900;
  font-size:1.125rem;
  box-shadow:0 14px 28px rgba(0,0,0,.28);
}
.contact-card:hover{
  background:var(--primary-50);
  border-color:var(--accent-400);
  transform:scale(1.06) translateY(-3px);
  box-shadow:0 20px 40px rgba(0,0,0,.35);
}
.icon-contact{width:22px;height:22px;color:var(--accent-600)}

.btn-cta-secondary{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:1rem 2rem;
  border-radius:.75rem;
  font-weight:900;
  text-decoration:none;
  transition:.3s;
  font-size:1.05rem;
  background:transparent;
  color:#fff;
  border:2px solid #fff;
}
.btn-cta-secondary:hover{
  background:rgba(255,255,255,.1);
  transform:scale(1.05);
}

.footer{
  padding:2rem 1rem;
  border-top:1px solid var(--primary-100);
  background:#fff;
}
.footer-content{
  max-width:1280px;
  margin:0 auto;
  text-align:center;
  color:var(--slate-600);
  display:flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  flex-wrap:wrap;
}
.icon-footer{width:16px;height:16px;color:var(--accent-600)}

.toast{
  position:fixed;
  left:50%;
  bottom:-60px;
  transform:translateX(-50%);
  background:#111827;
  color:#fff;
  padding:.6rem 1rem;
  border-radius:.5rem;
  box-shadow:0 10px 25px rgba(0,0,0,.35);
  font-size:.95rem;
  z-index:1100;
  opacity:0;
  transition:transform .35s ease, opacity .35s ease, bottom .35s ease;
}
.toast.show{bottom:18px;opacity:1}

@media (max-width:767px){
  .project-hero{padding:6.5rem 1rem 3rem}
  .section{padding:3.75rem 1rem}
  .section-title{font-size:2rem}
  .overview-card{padding:1.5rem}
  .evidence-card{padding:1.5rem}
  .deriv-card{padding:1.5rem}
  .demo-header{padding:1.25rem}
  .media-frame{padding:0 1.25rem 1.1rem}
  .demo-points{padding:0 1.25rem 1.25rem}
  .quat-grid{padding:0 1.25rem 1.25rem}
}