/* ═══════════════════════════════════════════════════════════════
   xSeraAI v2 — Design Tokens
═══════════════════════════════════════════════════════════════ */
:root {
  --slate-950: #0C1220;
  --slate-900: #0F172A;
  --slate-800: #1E293B;
  --slate-700: #334155;
  --slate-600: #475569;
  --slate-500: #64748B;
  --slate-400: #94A3B8;
  --slate-300: #CBD5E1;
  --slate-200: #E2E8F0;
  --slate-100: #F1F5F9;
  --slate-50:  #F8FAFC;
  --white:     #FFFFFF;

  --teal-700: #0F766E;
  --teal-600: #0D9488;
  --teal-500: #14B8A6;
  --teal-400: #2DD4BF;
  --teal-100: #CCFBF1;
  --teal-50:  #F0FDFA;
  --teal-glow: rgba(13,148,136,0.10);
  --teal-border: rgba(13,148,136,0.20);

  --amber-600: #D97706;
  --amber-100: #FEF3C7;

  --font: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', ui-monospace, monospace;

  --text-xs:   0.75rem;
  --text-sm:   0.875rem;
  --text-base: 1rem;
  --text-lg:   1.125rem;
  --text-xl:   1.25rem;
  --text-2xl:  1.5rem;
  --text-3xl:  1.875rem;
  --text-4xl:  2.25rem;
  --text-5xl:  clamp(2.5rem, 1.5rem + 3.5vw, 3.75rem);

  --content: 1120px;
  --content-narrow: 720px;
  --ease: cubic-bezier(0.16,1,0.3,1);
}

/* ═══ Reset ═══ */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth;scroll-padding-top:72px;-webkit-font-smoothing:antialiased}
body{font-family:var(--font);font-size:var(--text-base);color:var(--slate-700);background:var(--white);line-height:1.65}
h1,h2,h3,h4{font-weight:700;line-height:1.2;color:var(--slate-900);text-wrap:balance}
p{text-wrap:pretty}
img,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
ul{list-style:none}
button{cursor:pointer;border:none;background:none;font:inherit}
.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);border:0}

/* ═══ Utilities ═══ */
.container{width:100%;max-width:var(--content);margin:0 auto;padding:0 1.5rem}
.container-narrow{width:100%;max-width:var(--content-narrow);margin:0 auto;padding:0 1.5rem}
section{padding:5rem 0}
.eyebrow{font-family:var(--font-mono);font-size:var(--text-xs);letter-spacing:0.1em;text-transform:uppercase;color:var(--teal-600);margin-bottom:0.75rem;font-weight:500}
.section-title{font-size:var(--text-4xl);margin-bottom:1rem}
.section-sub{font-size:var(--text-lg);color:var(--slate-500);max-width:52ch;line-height:1.7}
.teal-bar{width:40px;height:3px;background:var(--teal-600);border-radius:2px;margin-bottom:1.5rem}
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.visible{opacity:1;transform:none}
.reveal-d1{transition-delay:.08s}.reveal-d2{transition-delay:.16s}.reveal-d3{transition-delay:.24s}.reveal-d4{transition-delay:.32s}
@media(prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

.btn{display:inline-flex;align-items:center;gap:0.5rem;padding:0.7rem 1.4rem;border-radius:8px;font-weight:600;font-size:var(--text-sm);transition:all 180ms var(--ease)}
.btn:hover{transform:translateY(-1px)}
.btn-teal{background:var(--teal-600);color:var(--white);box-shadow:0 2px 12px rgba(13,148,136,0.25)}
.btn-teal:hover{background:var(--teal-700);box-shadow:0 4px 20px rgba(13,148,136,0.35)}
.btn-outline{border:1.5px solid var(--slate-300);color:var(--slate-700)}
.btn-outline:hover{border-color:var(--teal-600);color:var(--teal-700);background:var(--teal-50)}
.btn-dark{background:var(--slate-900);color:var(--white)}
.btn-dark:hover{background:var(--slate-800)}

/* ═══ Nav ═══ */
#nav{position:sticky;top:0;z-index:100;background:rgba(255,255,255,0.88);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--slate-200);height:64px;display:flex;align-items:center}
.nav-inner{display:flex;align-items:center;justify-content:space-between;width:100%;max-width:var(--content);margin:0 auto;padding:0 1.5rem}
.nav-logo{display:flex;align-items:center;gap:0.6rem;font-weight:700;font-size:1.05rem;color:var(--slate-900)}
.nav-logo .x{color:var(--teal-600);font-size:0.82rem}
.nav-logo .tl{color:var(--teal-600)}
.nav-links{display:flex;align-items:center;gap:2rem}
.nav-links a{font-size:var(--text-sm);color:var(--slate-500);font-weight:500;transition:color 180ms}
.nav-links a:hover,.nav-links a.active{color:var(--slate-900)}
.nav-actions{display:flex;gap:0.75rem;align-items:center}
.nav-toggle{display:none;flex-direction:column;gap:4px;padding:6px}
.nav-toggle span{width:20px;height:2px;background:var(--slate-700);border-radius:2px}
.mobile-overlay{display:none;position:fixed;inset:0;background:var(--white);z-index:99;flex-direction:column;align-items:center;justify-content:center;gap:2.5rem}
.mobile-overlay.open{display:flex}
.mobile-overlay a{font-size:var(--text-2xl);font-weight:700;color:var(--slate-900)}

/* ═══ Hero (Home) ═══ */
.hero{padding:6rem 0 5rem;background:linear-gradient(180deg,var(--slate-50) 0%,var(--white) 100%)}
.hero-grid{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:center}
.hero-badge{display:inline-flex;align-items:center;gap:0.4rem;background:var(--teal-50);border:1px solid var(--teal-border);border-radius:100px;padding:0.3rem 0.85rem;margin-bottom:1.5rem}
.hero-badge span{font-family:var(--font-mono);font-size:0.7rem;color:var(--teal-700);letter-spacing:0.06em}
.hero-title{font-size:var(--text-5xl);color:var(--slate-900);margin-bottom:1.25rem;letter-spacing:-0.02em}
.hero-title em{font-style:normal;color:var(--teal-600)}
.hero-sub{font-size:var(--text-xl);color:var(--slate-500);line-height:1.65;margin-bottom:2rem;max-width:50ch}
.hero-actions{display:flex;gap:0.75rem;flex-wrap:wrap;margin-bottom:2.5rem}
.hero-proof{display:flex;gap:1.5rem;flex-wrap:wrap}
.proof-item{display:flex;align-items:center;gap:0.4rem;font-size:var(--text-xs);color:var(--slate-500)}
.proof-item .dot{width:6px;height:6px;border-radius:50%;background:var(--teal-500)}

.hero-diagram{background:var(--slate-50);border:1px solid var(--slate-200);border-radius:16px;padding:2rem;position:relative}
.stack-layer{display:flex;align-items:center;gap:1rem;padding:0.9rem 1.1rem;border-radius:10px;margin-bottom:0.5rem;transition:all 250ms var(--ease);cursor:default}
.stack-layer:hover{transform:translateX(4px)}
.stack-layer:last-child{margin-bottom:0}
.stack-num{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--slate-400);width:20px;flex-shrink:0}
.stack-label{font-weight:600;font-size:var(--text-sm);flex:1}
.stack-desc{font-size:0.72rem;color:var(--slate-500);font-family:var(--font-mono)}
.stack-l1{background:linear-gradient(135deg,var(--slate-900),var(--slate-800));color:var(--white);border:1px solid var(--slate-700)}
.stack-l1 .stack-num{color:var(--slate-400)}.stack-l1 .stack-desc{color:var(--slate-400)}
.stack-l2{background:var(--teal-50);border:1px solid var(--teal-border);color:var(--teal-700)}
.stack-l2 .stack-desc{color:var(--teal-600)}
.stack-l3{background:var(--white);border:1px solid var(--slate-200);color:var(--slate-800)}
.stack-l4{background:var(--white);border:1px solid var(--slate-200);color:var(--slate-800)}
.stack-connector{width:1px;height:12px;background:var(--slate-300);margin:0 auto;display:block}
.stack-diagram-label{font-family:var(--font-mono);font-size:0.65rem;color:var(--slate-400);text-align:center;letter-spacing:0.1em;text-transform:uppercase;margin-bottom:1rem}

/* ═══ Problem / Thesis ═══ */
.thesis{background:var(--white)}
.thesis-grid{display:grid;grid-template-columns:1fr 1fr;gap:4rem;align-items:start}
.thesis-comparison{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:1.5rem}
.compare-card{padding:1.5rem;border-radius:12px;border:1px solid var(--slate-200)}
.compare-card.weak{background:var(--slate-50)}
.compare-card.strong{background:var(--teal-50);border-color:var(--teal-border)}
.compare-card h4{font-size:var(--text-sm);margin-bottom:0.5rem}
.compare-card.weak h4{color:var(--slate-500)}
.compare-card.strong h4{color:var(--teal-700)}
.compare-card p{font-size:var(--text-sm);color:var(--slate-600);line-height:1.6}
.compare-card .perf{font-family:var(--font-mono);font-size:var(--text-2xl);font-weight:600;margin-bottom:0.25rem}
.compare-card.weak .perf{color:var(--slate-400)}
.compare-card.strong .perf{color:var(--teal-600)}
.thesis-stats{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:2rem}
.thesis-stat{padding:1.25rem;background:var(--slate-50);border-radius:10px;border:1px solid var(--slate-200)}
.thesis-stat .val{font-family:var(--font-mono);font-size:var(--text-2xl);font-weight:600;color:var(--slate-900);display:block;margin-bottom:0.15rem}
.thesis-stat .lbl{font-size:var(--text-xs);color:var(--slate-500)}

/* ═══ Capabilities ═══ */
.capabilities{background:var(--slate-50)}
.cap-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;margin-top:2.5rem}
.cap-card{background:var(--white);border:1px solid var(--slate-200);border-radius:14px;padding:2rem;transition:border-color 200ms,box-shadow 200ms}
.cap-card:hover{border-color:var(--teal-border);box-shadow:0 8px 24px rgba(13,148,136,0.08)}
.cap-icon{width:40px;height:40px;border-radius:10px;display:flex;align-items:center;justify-content:center;margin-bottom:1.25rem;font-size:1.2rem}
.cap-icon.curation{background:var(--teal-50);color:var(--teal-700)}
.cap-icon.orchestration{background:var(--slate-100);color:var(--slate-700)}
.cap-icon.learning{background:var(--amber-100);color:var(--amber-600)}
.cap-card h3{font-size:var(--text-lg);margin-bottom:0.5rem}
.cap-card p{font-size:var(--text-sm);color:var(--slate-500);line-height:1.65;max-width:100%}
.cap-detail{margin-top:1rem;display:flex;flex-direction:column;gap:0.4rem}
.cap-detail li{font-size:var(--text-xs);color:var(--slate-600);display:flex;align-items:flex-start;gap:0.4rem}
.cap-detail li::before{content:'';width:5px;height:5px;border-radius:50%;background:var(--teal-500);flex-shrink:0;margin-top:5px}

/* ═══ Verticals ═══ */
.verticals{background:var(--white)}
.vert-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:2.5rem}
.vert-card{border:1px solid var(--slate-200);border-radius:14px;padding:2rem;position:relative;overflow:hidden}
.vert-card::before{content:'';position:absolute;top:0;left:0;right:0;height:3px}
.vert-card.auto::before{background:var(--teal-600)}
.vert-card.hydra::before{background:var(--amber-600)}
.vert-badge{font-family:var(--font-mono);font-size:0.65rem;letter-spacing:0.08em;text-transform:uppercase;color:var(--teal-600);margin-bottom:0.75rem}
.vert-card.hydra .vert-badge{color:var(--amber-600)}
.vert-card h3{font-size:var(--text-xl);margin-bottom:0.5rem}
.vert-card>p{font-size:var(--text-sm);color:var(--slate-500);line-height:1.65;margin-bottom:1.25rem}
.vert-data{display:flex;gap:1.5rem;flex-wrap:wrap}
.vert-datum{font-size:var(--text-xs);color:var(--slate-500)}
.vert-datum strong{color:var(--slate-700);display:block;font-family:var(--font-mono);font-size:var(--text-base)}

/* ═══ Research / CRC-P ═══ */
.research{background:var(--slate-900);color:var(--white)}
.research .section-title{color:var(--white)}
.research .section-sub{color:var(--slate-400)}
.research .eyebrow{color:var(--teal-400)}
.consortium-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin-top:2.5rem}
.consortium-card{background:rgba(255,255,255,0.04);border:1px solid rgba(255,255,255,0.1);border-radius:12px;padding:1.5rem}
.consortium-card h4{font-size:var(--text-sm);color:var(--white);margin-bottom:0.25rem}
.consortium-card .role{font-family:var(--font-mono);font-size:0.68rem;color:var(--teal-400);margin-bottom:0.75rem}
.consortium-card p{font-size:var(--text-xs);color:var(--slate-400);line-height:1.6}
.alignment-row{display:flex;gap:1.5rem;margin-top:2.5rem;flex-wrap:wrap}
.align-tag{display:flex;align-items:center;gap:0.4rem;font-size:var(--text-xs);color:var(--slate-300);background:rgba(255,255,255,0.06);border:1px solid rgba(255,255,255,0.1);border-radius:100px;padding:0.35rem 0.85rem}
.align-tag .dot{width:5px;height:5px;border-radius:50%;background:var(--teal-400)}

/* ═══ Technology Page ═══ */
.tech-hero{padding:5rem 0 3rem;background:var(--slate-50)}
.athena-section{background:var(--white)}
.module-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1.5rem;margin-top:2.5rem}
.module-card{background:var(--slate-50);border:1px solid var(--slate-200);border-radius:12px;padding:1.75rem;border-top:3px solid var(--teal-600)}
.module-card h3{font-size:var(--text-lg);margin-bottom:0.25rem}
.module-card .mono{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--teal-600);margin-bottom:0.75rem}
.module-card p{font-size:var(--text-sm);color:var(--slate-500);line-height:1.65;margin-bottom:1rem}
.module-card ul{display:flex;flex-direction:column;gap:0.35rem}
.module-card li{font-size:var(--text-xs);color:var(--slate-600);display:flex;align-items:flex-start;gap:0.4rem}
.module-card li::before{content:'';width:5px;height:5px;border-radius:50%;background:var(--teal-500);flex-shrink:0;margin-top:5px}

.dslm-section{background:var(--slate-50)}
.dslm-comparison{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start;margin-top:2.5rem}
.dslm-col h3{font-size:var(--text-xl);margin-bottom:1rem}
.dslm-list{display:flex;flex-direction:column;gap:0.75rem}
.dslm-item{padding:1rem 1.25rem;background:var(--white);border:1px solid var(--slate-200);border-radius:10px;font-size:var(--text-sm);color:var(--slate-600);line-height:1.5}
.dslm-item strong{color:var(--slate-800);display:block;margin-bottom:0.15rem}
.dslm-item.teal{border-color:var(--teal-border);background:var(--teal-50)}
.dslm-item.teal strong{color:var(--teal-700)}

.pipeline-section{background:var(--white)}
.pipeline-flow{display:grid;grid-template-columns:repeat(4,1fr);gap:1rem;margin-top:2.5rem}
.pipe-step{text-align:center;padding:1.5rem 1rem;background:var(--slate-50);border:1px solid var(--slate-200);border-radius:12px;position:relative}
.pipe-step::after{content:'\2192';position:absolute;right:-14px;top:50%;transform:translateY(-50%);color:var(--slate-300);font-size:1rem}
.pipe-step:last-child::after{display:none}
.pipe-num{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--teal-600);margin-bottom:0.5rem}
.pipe-step h4{font-size:var(--text-sm);margin-bottom:0.35rem}
.pipe-step p{font-size:var(--text-xs);color:var(--slate-500);line-height:1.5}

/* ═══ About Page ═══ */
.about-hero{padding:5rem 0 3rem;background:var(--slate-50)}
.founder-section{background:var(--white)}
.founder-grid{display:grid;grid-template-columns:280px 1fr;gap:3rem;align-items:start;margin-top:2rem}
.founder-card{background:var(--slate-50);border:1px solid var(--slate-200);border-radius:14px;padding:2rem;text-align:center}
.founder-avatar{width:80px;height:80px;border-radius:50%;background:var(--teal-50);border:2px solid var(--teal-border);display:flex;align-items:center;justify-content:center;margin:0 auto 1rem;font-size:1.5rem;color:var(--teal-600);font-weight:700}
.founder-card h3{font-size:var(--text-lg);margin-bottom:0.15rem}
.founder-card .title{font-size:var(--text-sm);color:var(--teal-600);margin-bottom:0.75rem}
.founder-tags{display:flex;flex-wrap:wrap;gap:0.35rem;justify-content:center}
.founder-tag{font-family:var(--font-mono);font-size:0.62rem;color:var(--slate-500);background:var(--white);border:1px solid var(--slate-200);border-radius:100px;padding:0.2rem 0.55rem}
.founder-bio h4{font-size:var(--text-xl);margin-bottom:0.75rem;color:var(--slate-900)}
.founder-bio p{font-size:var(--text-base);color:var(--slate-600);line-height:1.7;margin-bottom:1rem}
.timeline-compact{display:flex;flex-direction:column;gap:0.75rem;margin-top:1.5rem}
.tl-item{display:flex;gap:1rem;align-items:flex-start;padding:1rem;border-left:2px solid var(--teal-border);background:var(--slate-50);border-radius:0 10px 10px 0}
.tl-item .yr{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--teal-600);flex-shrink:0;width:40px}
.tl-item p{font-size:var(--text-sm);color:var(--slate-600);max-width:100%}
.tl-item strong{color:var(--slate-800)}

.advisors{background:var(--slate-50)}
.advisor-grid{display:grid;grid-template-columns:1fr 1fr;gap:1.5rem;margin-top:2.5rem}
.advisor-card2{background:var(--white);border:1px solid var(--slate-200);border-radius:12px;padding:1.75rem;border-top:2px solid var(--teal-600)}
.advisor-card2 h3{font-size:var(--text-base);margin-bottom:0.1rem}
.advisor-card2 .role{font-family:var(--font-mono);font-size:var(--text-xs);color:var(--teal-600);margin-bottom:0.75rem}
.advisor-card2 p{font-size:var(--text-sm);color:var(--slate-500);line-height:1.6}

/* ═══ Contact Page ═══ */
.contact-hero{padding:5rem 0 3rem;background:var(--slate-50)}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:3rem;align-items:start}
.contact-paths{display:flex;flex-direction:column;gap:1rem}
.path-card{background:var(--slate-50);border:1px solid var(--slate-200);border-radius:12px;padding:1.5rem}
.path-card h3{font-size:var(--text-base);margin-bottom:0.35rem}
.path-card p{font-size:var(--text-sm);color:var(--slate-500);max-width:100%}
.contact-form{display:flex;flex-direction:column;gap:1rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:1rem}
.form-field{display:flex;flex-direction:column;gap:0.35rem}
.form-field label{font-size:var(--text-sm);font-weight:500;color:var(--slate-700)}
.form-field input,.form-field select,.form-field textarea{border:1.5px solid var(--slate-200);border-radius:8px;padding:0.65rem 0.9rem;font:inherit;font-size:var(--text-sm);color:var(--slate-900);outline:none;transition:border-color 180ms}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:var(--teal-600);box-shadow:0 0 0 3px var(--teal-glow)}
.form-field textarea{resize:vertical;min-height:100px}
.form-success{display:none;text-align:center;padding:3rem;background:var(--teal-50);border:1px solid var(--teal-border);border-radius:14px}
.form-success h4{color:var(--teal-700);font-size:var(--text-xl);margin-bottom:0.5rem}
.form-success p{color:var(--slate-600)}

/* ═══ Footer ═══ */
footer{background:var(--slate-900);color:var(--slate-400);padding:3rem 0}
.footer-inner{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:1.5rem}
.footer-logo{font-weight:700;font-size:1rem;color:var(--white)}
.footer-logo .x{color:var(--teal-500);font-size:0.8rem}
.footer-logo .tl{color:var(--teal-500)}
.footer-links{display:flex;gap:1.5rem}
.footer-links a{font-size:var(--text-xs);color:var(--slate-400);transition:color 180ms}
.footer-links a:hover{color:var(--white)}
.footer-copy{font-size:var(--text-xs);color:var(--slate-600)}

/* ═══ Responsive ═══ */
@media(max-width:900px){
  .hero-grid,.thesis-grid,.dslm-comparison,.contact-grid,.founder-grid{grid-template-columns:1fr}
  .cap-grid,.module-grid,.consortium-grid{grid-template-columns:1fr 1fr}
  .pipeline-flow{grid-template-columns:1fr 1fr}
  .pipe-step::after{display:none}
  .vert-grid,.advisor-grid{grid-template-columns:1fr}
  .nav-links,.nav-actions{display:none}
  .nav-toggle{display:flex}
  .hero-diagram{margin-top:1rem}
  .founder-grid{grid-template-columns:1fr}
  .founder-card{max-width:300px;margin:0 auto}
}
@media(max-width:600px){
  .cap-grid,.module-grid,.consortium-grid{grid-template-columns:1fr}
  .thesis-comparison,.thesis-stats{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .pipeline-flow{grid-template-columns:1fr}
  .hero-proof{flex-direction:column}
  section{padding:3.5rem 0}
}