/* ===================================================================
   Santander Labs — Styles
   Premium dark R&D lab UI with glassmorphism, gradients, glowing accents
   =================================================================== */

:root {
  --c-bg:#0a0c10;--c-bg-alt:#0d1017;--c-surface:rgba(15,19,28,0.75);--c-surface-hover:rgba(22,28,42,0.85);
  --c-border:rgba(255,255,255,0.06);--c-border-hover:rgba(255,255,255,0.12);
  --c-text:#e8eaf0;--c-text-sec:#9ca3b4;--c-text-muted:#5a6275;
  --c-a1:#6366f1;--c-a2:#8b5cf6;--c-a3:#06b6d4;--c-a4:#10b981;--c-a5:#f59e0b;--c-a6:#ec4899;
  --c-g1:rgba(99,102,241,0.35);--c-g2:rgba(139,92,246,0.35);--c-g3:rgba(6,182,212,0.35);
  --grad-hero:linear-gradient(160deg,#0a0c10 0%,#111428 50%,#0a0c10 100%);
  --grad-accent:linear-gradient(135deg,var(--c-a1),var(--c-a2));
  --sp-xs:.25rem;--sp-sm:.5rem;--sp-md:1rem;--sp-lg:2rem;--sp-xl:4rem;--sp-2xl:6rem;
  --font-base:'Inter',-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;
  --font-mono:'JetBrains Mono','Fira Code','Cascadia Code','Consolas',monospace;
  --fs-xs:.75rem;--fs-sm:.875rem;--fs-base:1rem;--fs-lg:1.125rem;--fs-xl:1.5rem;--fs-2xl:2rem;--fs-3xl:2.75rem;
  --fs-hero:clamp(2.5rem,5vw,4.5rem);
  --r-sm:6px;--r-md:12px;--r-lg:20px;--r-xl:28px;
  --shadow-glow:0 0 30px rgba(99,102,241,0.15);
  --tf:150ms ease;--tb:250ms ease;--ts:400ms ease;
  --max-w:1200px;--nav-h:64px;
}

*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:var(--nav-h)}
body{font-family:var(--font-base);font-size:var(--fs-base);line-height:1.6;color:var(--c-text);background:var(--c-bg);-webkit-font-smoothing:antialiased}
a{color:var(--c-a3);text-decoration:none;transition:color var(--tf)}
a:hover{color:var(--c-a1)}
a:focus-visible,button:focus-visible{outline:2px solid var(--c-a3);outline-offset:2px;border-radius:var(--r-sm)}
img{max-width:100%;display:block}
.container{max-width:var(--max-w);margin:0 auto;padding:0 var(--sp-lg)}

/* Navbar */
.navbar{position:fixed;top:0;left:0;right:0;z-index:1000;height:var(--nav-h);background:rgba(10,12,16,0.85);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--c-border)}
.nav-inner{max-width:var(--max-w);margin:0 auto;padding:0 var(--sp-lg);display:flex;align-items:center;justify-content:space-between;height:100%}
.nav-logo{display:flex;align-items:center;gap:var(--sp-sm);font-size:var(--fs-lg);font-weight:700;color:var(--c-text);letter-spacing:-0.02em;text-decoration:none}
.nav-logo:hover{color:var(--c-text)}
.nav-logo-img{width:28px;height:28px;border-radius:8px;object-fit:contain}
.nav-brand-text{font-family:'Space Grotesk',system-ui,sans-serif;font-weight:700;letter-spacing:2px;font-size:0.85rem}
.nav-links{display:flex;list-style:none;gap:var(--sp-md)}
.nav-links a{color:var(--c-text-sec);font-size:var(--fs-sm);font-weight:500;padding:var(--sp-xs) var(--sp-sm);border-radius:var(--r-sm);transition:color var(--tf),background var(--tf)}
.nav-links a:hover{color:var(--c-text);background:rgba(255,255,255,0.05)}
.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:36px;height:36px;padding:6px;background:none;border:none;cursor:pointer;border-radius:var(--r-sm)}
.nav-toggle:hover{background:rgba(255,255,255,0.05)}
.hamburger-line{display:block;width:100%;height:2px;background:var(--c-text);border-radius:1px;transition:transform var(--tb),opacity var(--tf)}
.nav-open .hamburger-line:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-open .hamburger-line:nth-child(2){opacity:0}
.nav-open .hamburger-line:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* Sections */
.section{padding:var(--sp-2xl) 0}
.section-alt{background:var(--c-bg-alt)}
.section-header{text-align:center;margin-bottom:var(--sp-xl)}
.section-eyebrow{font-size:var(--fs-sm);font-weight:600;text-transform:uppercase;letter-spacing:.12em;color:var(--c-a3);margin-bottom:var(--sp-sm)}
.section-title{font-size:var(--fs-3xl);font-weight:800;letter-spacing:-0.03em;line-height:1.2;margin-bottom:var(--sp-md);background:var(--grad-accent);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}
.section-desc{font-size:var(--fs-lg);color:var(--c-text-sec);max-width:640px;margin:0 auto}

/* Hero */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;justify-content:center;overflow:hidden;background:var(--grad-hero);padding-top:var(--nav-h)}
.hero-bg{position:absolute;inset:0;overflow:hidden;pointer-events:none}
.orb{position:absolute;border-radius:50%;filter:blur(80px);opacity:.4}
.orb-1{width:500px;height:500px;background:var(--c-a1);top:-10%;right:-5%;animation:of1 18s ease-in-out infinite}
.orb-2{width:400px;height:400px;background:var(--c-a2);bottom:10%;left:-8%;animation:of2 22s ease-in-out infinite}
.orb-3{width:300px;height:300px;background:var(--c-a3);top:50%;left:50%;transform:translate(-50%,-50%);animation:of3 15s ease-in-out infinite}
.grid-overlay{position:absolute;inset:0;background-image:linear-gradient(rgba(255,255,255,0.02) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,0.02) 1px,transparent 1px);background-size:60px 60px;mask-image:radial-gradient(ellipse 60% 60% at 50% 50%,black 30%,transparent 70%);-webkit-mask-image:radial-gradient(ellipse 60% 60% at 50% 50%,black 30%,transparent 70%)}
@keyframes of1{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(-40px,30px) scale(1.05)}66%{transform:translate(20px,-20px) scale(.95)}}
@keyframes of2{0%,100%{transform:translate(0,0) scale(1)}33%{transform:translate(30px,-40px) scale(1.08)}66%{transform:translate(-20px,20px) scale(.93)}}
@keyframes of3{0%,100%{transform:translate(-50%,-50%) scale(1)}50%{transform:translate(-50%,-50%) scale(1.15)}}
.hero-content{position:relative;z-index:1;text-align:center;padding:var(--sp-xl) var(--sp-lg);max-width:800px}
.hero-eyebrow{font-size:var(--fs-sm);font-weight:600;text-transform:uppercase;letter-spacing:.2em;color:var(--c-a3);margin-bottom:var(--sp-md)}
.hero-title{font-size:var(--fs-hero);font-weight:900;letter-spacing:-0.04em;line-height:1.1;margin-bottom:var(--sp-lg);background:linear-gradient(135deg,#fff 0%,var(--c-a3) 50%,var(--c-a1) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;display:flex;align-items:center;gap:0.3em;justify-content:center;flex-wrap:wrap}
.hero-logo-img{width:48px;height:48px;border-radius:12px;object-fit:contain;-webkit-text-fill-color:initial;flex-shrink:0}
.hero-subtitle{font-size:var(--fs-lg);color:var(--c-text-sec);line-height:1.7;margin-bottom:var(--sp-xl)}
.hero-actions{display:flex;gap:var(--sp-md);justify-content:center;flex-wrap:wrap}

/* Buttons */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:var(--sp-sm);padding:.85rem 2rem;font-size:var(--fs-base);font-weight:600;border-radius:var(--r-lg);cursor:pointer;transition:all var(--tb);border:none;text-decoration:none}
.btn-primary{background:var(--grad-accent);color:#fff;box-shadow:0 4px 24px rgba(99,102,241,0.35)}
.btn-primary:hover{box-shadow:0 6px 32px rgba(99,102,241,0.5);transform:translateY(-2px);color:#fff}
.btn-outline{background:transparent;color:var(--c-text);border:1px solid var(--c-border-hover);backdrop-filter:blur(10px)}
.btn-outline:hover{background:rgba(255,255,255,0.05);border-color:var(--c-a3);color:var(--c-a3);transform:translateY(-2px)}

/* Card Grid */
.card-grid{display:grid;gap:var(--sp-lg)}
.card-grid-3{grid-template-columns:repeat(3,1fr)}

/* Card base */
.card{position:relative;background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r-lg);padding:var(--sp-lg);backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);transition:border-color var(--tb),transform var(--tb),box-shadow var(--tb);overflow:hidden}
.card:hover{border-color:var(--c-border-hover);transform:translateY(-4px);box-shadow:var(--shadow-glow)}
.card-glow{position:absolute;top:-60%;left:-20%;width:140%;height:140%;background:radial-gradient(circle at 30% 30%,var(--c-g1),transparent 50%);opacity:0;transition:opacity var(--ts);pointer-events:none}
.card:hover .card-glow{opacity:.12}

/* Project Cards */
.project-card .card-type{display:inline-block;font-size:var(--fs-xs);font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--c-a3);background:rgba(6,182,212,0.1);padding:2px 10px;border-radius:20px;margin-bottom:var(--sp-md)}
.project-card .card-title{font-size:var(--fs-xl);font-weight:700;margin-bottom:var(--sp-sm);letter-spacing:-0.02em}
.card-stage{display:flex;align-items:center;gap:6px;font-size:var(--fs-sm);color:var(--c-text-sec);margin-bottom:var(--sp-md)}
.stage-dot{width:8px;height:8px;border-radius:50%;background:var(--c-text-muted);flex-shrink:0}
.stage-dot.active{background:var(--c-a4);box-shadow:0 0 8px rgba(16,185,129,0.5)}
.card-desc{color:var(--c-text-sec);font-size:var(--fs-sm);line-height:1.6;margin-bottom:var(--sp-md)}
.card-future{font-size:var(--fs-sm);color:var(--c-a5);padding-top:var(--sp-md);border-top:1px solid var(--c-border);line-height:1.5}

/* Agent Cards */
.agent-card .agent-header{display:flex;align-items:center;gap:var(--sp-md);margin-bottom:var(--sp-md)}
.agent-icon{display:flex;align-items:center;justify-content:center;width:48px;height:48px;border-radius:var(--r-md);font-size:1.5rem;flex-shrink:0}
.agent-card:nth-child(1) .agent-icon{background:rgba(99,102,241,0.15);color:var(--c-a1)}
.agent-card:nth-child(2) .agent-icon{background:rgba(139,92,246,0.15);color:var(--c-a2)}
.agent-card:nth-child(3) .agent-icon{background:rgba(6,182,212,0.15);color:var(--c-a3)}
.agent-card .card-title{font-size:var(--fs-xl);font-weight:700;letter-spacing:-0.02em}
.agent-role{font-size:var(--fs-sm);color:var(--c-a3);font-weight:500}
.agent-details{margin-top:var(--sp-md);padding-top:var(--sp-md);border-top:1px solid var(--c-border);display:grid;grid-template-columns:auto 1fr;gap:4px var(--sp-md);font-size:var(--fs-sm)}
.agent-details dt{color:var(--c-text-muted);font-weight:500}
.agent-details dd{color:var(--c-text-sec)}
.agent-glow-1{background:radial-gradient(circle at 30% 30%,var(--c-g1),transparent 50%)!important}
.agent-glow-2{background:radial-gradient(circle at 30% 30%,var(--c-g2),transparent 50%)!important}
.agent-glow-3{background:radial-gradient(circle at 30% 30%,var(--c-g3),transparent 50%)!important}

/* Engine Architecture */
.engine-stack{display:flex;flex-direction:column;align-items:center;gap:0;max-width:700px;margin:0 auto}
.engine-layer{position:relative;width:100%;padding:var(--sp-lg) var(--sp-xl);border-radius:var(--r-lg);border:1px solid var(--c-border);background:var(--c-surface);backdrop-filter:blur(16px);overflow:hidden;transition:border-color var(--tb),box-shadow var(--tb)}
.engine-layer:hover{border-color:var(--c-border-hover);box-shadow:var(--shadow-glow)}
.engine-layer-glow{position:absolute;top:-50%;right:-30%;width:80%;height:150%;pointer-events:none;opacity:.15;border-radius:50%;filter:blur(40px)}
.engine-kronos .engine-layer-glow{background:var(--c-a2)}
.engine-helios .engine-layer-glow{background:var(--c-a1)}
.engine-iris .engine-layer-glow{background:var(--c-a3)}
.engine-label{display:flex;align-items:baseline;gap:var(--sp-md);margin-bottom:var(--sp-sm);flex-wrap:wrap}
.engine-tier{font-size:var(--fs-xs);font-weight:600;text-transform:uppercase;letter-spacing:.1em;padding:2px 10px;border-radius:20px}
.engine-kronos .engine-tier{background:rgba(139,92,246,0.15);color:var(--c-a2)}
.engine-helios .engine-tier{background:rgba(99,102,241,0.15);color:var(--c-a1)}
.engine-iris .engine-tier{background:rgba(6,182,212,0.15);color:var(--c-a3)}
.engine-name{font-size:var(--fs-xl);font-weight:700;letter-spacing:-0.02em}
.engine-desc{font-size:var(--fs-sm);color:var(--c-text-sec);line-height:1.6}
.engine-connector{display:flex;flex-direction:column;align-items:center;height:40px;justify-content:center}
.connector-line{width:2px;height:20px;background:linear-gradient(to bottom,var(--c-a2),var(--c-a1))}
.connector-arrow{color:var(--c-a1);font-size:.75rem;line-height:1}

/* Research Cards */
.research-card{text-align:center}
.research-icon{display:inline-flex;align-items:center;justify-content:center;width:56px;height:56px;border-radius:var(--r-md);background:rgba(6,182,212,0.08);font-size:1.5rem;margin-bottom:var(--sp-md)}
.research-card .card-title{font-size:var(--fs-lg);font-weight:700;margin-bottom:var(--sp-sm)}

/* Timeline */
.timeline-track{position:relative;max-width:640px;margin:0 auto}
.timeline-track::before{content:'';position:absolute;left:16px;top:0;bottom:0;width:2px;background:linear-gradient(to bottom,var(--c-a3),var(--c-a1),var(--c-a2));border-radius:2px}
.timeline-item{position:relative;padding-left:48px;padding-bottom:var(--sp-xl);cursor:pointer;transition:opacity var(--tb)}
.timeline-item:last-child{padding-bottom:0}
.timeline-marker{position:absolute;left:8px;top:4px;width:18px;height:18px;border-radius:50%;border:2px solid var(--c-border-hover);background:var(--c-bg);transition:all var(--tb);z-index:1}
.timeline-item:hover .timeline-marker{border-color:var(--c-a3);box-shadow:0 0 12px rgba(6,182,212,0.4);background:var(--c-a3)}
.timeline-item.active .timeline-marker{border-color:var(--c-a4);background:var(--c-a4);box-shadow:0 0 12px rgba(16,185,129,0.5)}
.timeline-content{background:var(--c-surface);border:1px solid var(--c-border);border-radius:var(--r-md);padding:var(--sp-md) var(--sp-lg);backdrop-filter:blur(12px);transition:all var(--tb)}
.timeline-item:hover .timeline-content,.timeline-item.active .timeline-content{border-color:var(--c-border-hover);box-shadow:var(--shadow-glow)}
.timeline-phase{display:inline-block;font-size:var(--fs-xs);font-weight:600;text-transform:uppercase;letter-spacing:.1em;color:var(--c-a3);margin-bottom:4px}
.timeline-heading{font-size:var(--fs-lg);font-weight:700;margin-bottom:4px}
.timeline-summary{font-size:var(--fs-sm);color:var(--c-text-sec)}
.timeline-detail{margin-top:var(--sp-md);padding-top:var(--sp-md);border-top:1px solid var(--c-border);font-size:var(--fs-sm);color:var(--c-text-sec);line-height:1.6}
.timeline-item .timeline-detail[hidden]{display:none}

/* Terminal */
.terminal-window{max-width:780px;margin:0 auto;border-radius:var(--r-lg);border:1px solid var(--c-border);overflow:hidden;background:rgba(8,10,16,0.95);backdrop-filter:blur(16px);box-shadow:0 8px 40px rgba(0,0,0,0.5)}
.terminal-topbar{display:flex;align-items:center;gap:var(--sp-md);padding:10px 16px;background:rgba(255,255,255,0.03);border-bottom:1px solid var(--c-border)}
.terminal-dots{display:flex;gap:6px}
.dot{width:10px;height:10px;border-radius:50%}
.dot-red{background:#ef4444}
.dot-yellow{background:#f59e0b}
.dot-green{background:#10b981}
.terminal-title{font-size:var(--fs-xs);color:var(--c-text-muted);font-family:var(--font-mono)}
.terminal-body{padding:var(--sp-lg);min-height:220px;font-family:var(--font-mono);font-size:var(--fs-sm);line-height:1.8;color:var(--c-text-sec)}
.terminal-body .line{opacity:0;animation:termFadeIn .3s ease forwards}
.terminal-body .line-prefix{color:var(--c-a4)}
.terminal-body .cursor{display:inline-block;width:8px;height:16px;background:var(--c-a4);animation:cursorBlink 1s step-end infinite;vertical-align:text-bottom;margin-left:4px}
@keyframes termFadeIn{to{opacity:1}}
@keyframes cursorBlink{0%,100%{opacity:1}50%{opacity:0}}

/* Footer */
.footer{padding:var(--sp-xl) 0;border-top:1px solid var(--c-border)}
.footer-inner{text-align:center}
.footer-brand{font-size:var(--fs-lg);font-weight:700;color:var(--c-text);margin-bottom:var(--sp-sm);letter-spacing:-0.02em;display:flex;align-items:center;gap:var(--sp-sm);justify-content:center}
.footer-brand .nav-logo-img{width:28px;height:28px;border-radius:8px;object-fit:contain}
.footer-brand .nav-brand-text{font-family:'Space Grotesk',system-ui,sans-serif;font-weight:700;letter-spacing:2px;font-size:0.85rem}
.footer-copy{font-size:var(--fs-sm);color:var(--c-text-muted);margin-bottom:var(--sp-md)}
.footer-links{display:flex;gap:var(--sp-lg);justify-content:center;flex-wrap:wrap}
.footer-links a{font-size:var(--fs-sm);color:var(--c-text-sec)}
.footer-links a:hover{color:var(--c-a3)}

/* ===== Responsive ===== */
@media (max-width:1024px) {
  .card-grid-3{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:768px) {
  .nav-toggle{display:flex}
  .nav-links{display:none;position:absolute;top:var(--nav-h);left:0;right:0;background:rgba(10,12,16,0.97);backdrop-filter:blur(20px);flex-direction:column;padding:var(--sp-md) var(--sp-lg);border-bottom:1px solid var(--c-border);gap:0}
  .nav-links.nav-open{display:flex}
  .nav-links li{width:100%}
  .nav-links a{display:block;padding:var(--sp-md) var(--sp-sm)}
  .card-grid-3{grid-template-columns:1fr}
  .card-grid-3 .card{padding:var(--sp-md)}
  .section{padding:var(--sp-xl) 0}
  .section-title{font-size:var(--fs-2xl)}
  .hero-title{font-size:clamp(2rem,8vw,3.5rem)}
  .hero-subtitle{font-size:var(--fs-base)}
  .engine-layer{padding:var(--sp-md)}
  .terminal-body{padding:var(--sp-md);min-height:180px}
  .footer-links{flex-direction:column;gap:var(--sp-sm)}
}
@media (max-width:480px) {
  .container{padding:0 var(--sp-md)}
  .hero-content{padding:var(--sp-lg) var(--sp-md)}
  .btn{padding:.75rem 1.5rem;font-size:var(--fs-sm)}
}