:root{
--paper:#F5F1E6;
--paper-deep:#EFE9D9;
--line:#DCD3BC;
--line-strong:#C9BFA3;
--ink:#1B1C2E;
--ink-soft:#5A5648;
--ink-faint:#8C8672;
--navy:#10142A;
--navy-soft:#1B2040;
--paper-on-navy:#EFE9D9;
--hero-bg:#1C130D;
--hero-bg-soft:#241A12;
--hero-bg-rgb:28,19,13;
--g1:#C4237A;
--g2:#5B3FD1;
--g3:#1B9E82;
--gradient: linear-gradient(115deg, var(--g1) 0%, var(--g2) 50%, var(--g3) 100%);
--font-display:'Fraunces', serif;
--font-body:'Source Serif 4', serif;
--font-mono:'JetBrains Mono', monospace;
}

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

html{scroll-behavior:smooth;}

body{
background:var(--paper);
color:var(--ink);
font-family:var(--font-body);
font-size:17px;
line-height:1.65;
-webkit-font-smoothing:antialiased;
}

@media (prefers-reduced-motion: reduce){
html{scroll-behavior:auto;}
*{animation-duration:0.001ms !important; transition-duration:0.001ms !important;}
}

a{color:inherit;}
:focus-visible{outline:2px solid var(--g2); outline-offset:3px;}

.wrap{max-width:1120px; margin:0 auto; padding:0 32px;}
.col{max-width:700px; margin:0 auto; padding:0 32px;}


.wordmark-lockup{
height:24px; width:auto; display:block;
}
.wordmark-lockup-footer{
height:20px; width:auto; display:block;
}

/* ---------- Masthead (unchanged) ---------- */
.masthead{
background:var(--navy);
color:var(--paper-on-navy);
border-bottom:1px solid rgba(239,233,217,0.12);
}
.masthead-top{
display:flex; align-items:center; justify-content:space-between;
padding:18px 32px;
max-width:1120px; margin:0 auto;
}
.brand{display:flex; align-items:center; text-decoration:none;}
.brand .slash{
font-style:italic;
background:var(--gradient);
-webkit-background-clip:text;
background-clip:text;
color:transparent;
margin:0 1px;
}
nav{display:flex; gap:32px; font-family:var(--font-mono); font-size:12.5px; letter-spacing:0.06em; text-transform:uppercase;}
nav a{text-decoration:none; color:rgba(239,233,217,0.75); position:relative; padding-bottom:3px; transition:color .2s ease;}
nav a::after{
content:""; position:absolute; left:0; right:0; bottom:0; height:2px;
background:var(--gradient); transform:scaleX(0); transform-origin:left;
transition:transform .25s ease;
}
nav a:hover{color:var(--paper-on-navy);}
nav a:hover::after{transform:scaleX(1);}

.nav-toggle{
display:none;
width:32px; height:24px;
background:transparent; border:none; cursor:pointer;
padding:0; position:relative; flex-shrink:0;
}
.nav-toggle span{
position:absolute; left:0; right:0; height:1.5px;
background:var(--paper-on-navy);
transition: transform .25s ease, opacity .2s ease, top .25s ease;
}
.nav-toggle span:nth-child(1){top:2px;}
.nav-toggle span:nth-child(2){top:11px;}
.nav-toggle span:nth-child(3){top:20px;}
.nav-toggle[aria-expanded="true"] span:nth-child(1){top:11px; transform:rotate(45deg);}
.nav-toggle[aria-expanded="true"] span:nth-child(2){opacity:0;}
.nav-toggle[aria-expanded="true"] span:nth-child(3){top:11px; transform:rotate(-45deg);}

.mobile-nav{
display:none;
flex-direction:column;
max-height:0;
overflow:hidden;
transition:max-height .3s ease;
}
.mobile-nav a{
display:block;
font-family:var(--font-mono); font-size:13px; letter-spacing:0.06em; text-transform:uppercase;
color:rgba(239,233,217,0.75); text-decoration:none;
padding:16px 32px;
border-top:1px solid rgba(239,233,217,0.1);
}
.mobile-nav a:hover{color:var(--paper-on-navy);}
.mobile-nav.open{max-height:320px;}

.masthead-strip{
font-family:var(--font-mono);
font-size:11.5px;
letter-spacing:0.08em;
color:rgba(239,233,217,0.5);
border-top:1px solid rgba(239,233,217,0.1);
padding:9px 32px;
max-width:1120px; margin:0 auto;
display:flex; justify-content:space-between; text-transform:uppercase;
}

/* ---------- Shared type ---------- */
.eyebrow{
display:flex; align-items:center; gap:10px;
font-family:var(--font-mono); font-size:12.5px; letter-spacing:0.12em; text-transform:uppercase;
color:var(--ink-faint); margin-bottom:28px;
}
.eyebrow .tick{width:14px; height:3px; background:var(--gradient); flex-shrink:0;}

h1{
font-family:var(--font-display);
font-weight:400;
font-size:clamp(34px, 5.2vw, 58px);
line-height:1.12;
letter-spacing:-0.01em;
max-width:880px;
}
h1 em{font-style:italic; font-weight:500;}

.hero-sub{
font-family:var(--font-body);
font-size:19px;
color:var(--ink-soft);
max-width:600px;
margin-top:26px;
line-height:1.6;
}

.byline{
margin-top:40px;
font-family:var(--font-mono);
font-size:12.5px;
letter-spacing:0.05em;
color:var(--ink-faint);
display:flex; gap:10px; align-items:center; flex-wrap:wrap;
}
.byline strong{color:var(--ink-soft); font-weight:600;}
.byline .dot{width:4px; height:4px; border-radius:50%; background:var(--ink-faint);}

.hero-cta{
display:flex; gap:14px; margin-top:44px; flex-wrap:wrap;
}
.btn{
font-family:var(--font-mono);
font-size:13px; letter-spacing:0.05em; text-transform:uppercase;
padding:13px 22px;
text-decoration:none;
border:1px solid var(--ink);
display:inline-block;
transition: all .2s ease;
}
.btn-primary{background:var(--ink); color:var(--paper);}
.btn-primary:hover{background:var(--navy);}
.btn-secondary{background:transparent; color:var(--ink); border-color:var(--line-strong);}
.btn-secondary:hover{border-color:var(--ink);}

/* ---------- Hero: full-bleed animated signal, stands in for video ---------- */
.hero{
position:relative;
min-height:94vh;
background:var(--hero-bg);
overflow:hidden;
display:flex;
align-items:center;
border-bottom:1px solid rgba(239,233,217,0.12);
}
#signal{
position:absolute; inset:0; width:100%; height:100%; display:block;
}
.hero-video{
position:absolute; inset:0; width:100%; height:100%;
object-fit:cover; object-position:center;
opacity:0; transition:opacity 1.2s ease;
pointer-events:none;
}
.hero-video.is-ready{opacity:1;}
.hero-vignette{
position:absolute; inset:0;
background:
  radial-gradient(ellipse at 30% 30%, rgba(var(--hero-bg-rgb),0.08) 0%, rgba(var(--hero-bg-rgb),0.62) 60%, rgba(var(--hero-bg-rgb),0.92) 100%);
pointer-events:none;
}
.hero-inner{
position:relative; z-index:2;
max-width:920px; margin:0 auto; padding:0 32px;
width:100%;
}
.eyebrow-dark{color:rgba(239,233,217,0.62);}
.h1-dark{color:var(--paper-on-navy);}
.hero-sub-dark{color:rgba(239,233,217,0.72);}
.byline-dark{color:rgba(239,233,217,0.5);}
.byline-dark strong{color:rgba(239,233,217,0.85);}
.byline-dark .dot{background:rgba(239,233,217,0.4);}
.btn-secondary-dark{color:var(--paper-on-navy); border-color:rgba(239,233,217,0.35);}
.btn-secondary-dark:hover{border-color:var(--paper-on-navy);}
.hero .btn-primary{background:var(--paper-on-navy); color:var(--navy); border-color:var(--paper-on-navy);}
.hero .btn-primary:hover{background:#fff;}

.hero-scroll{
position:absolute; left:50%; bottom:28px; transform:translateX(-50%);
z-index:2;
}
.hero-scroll span{
display:block; width:1px; height:44px;
background:linear-gradient(180deg, rgba(239,233,217,0.6), rgba(239,233,217,0));
animation:scrollPulse 2.2s ease-in-out infinite;
}
@keyframes scrollPulse{
0%{ transform:translateY(0); opacity:0.9; }
50%{ transform:translateY(10px); opacity:0.3; }
100%{ transform:translateY(0); opacity:0.9; }
}

/* ---------- Section shell ---------- */
section{padding:76px 0;}
.section-head{margin-bottom:44px;}
.section-num{
font-family:var(--font-mono); font-size:12px; color:var(--ink-faint);
letter-spacing:0.1em; text-transform:uppercase;
display:flex; align-items:center; gap:10px; margin-bottom:14px;
}
.section-num .tick{width:14px; height:3px; background:var(--gradient); flex-shrink:0;}
h2{
font-family:var(--font-display);
font-weight:400;
font-size:clamp(26px, 3.4vw, 36px);
letter-spacing:-0.005em;
}
.section-lead{
margin-top:18px; color:var(--ink-soft); font-size:17.5px; max-width:620px;
}
#roadmap .section-lead, #viva .section-lead{color:rgba(239,233,217,0.68);}

/* ---------- Scroll reveal ---------- */
.reveal{
opacity:0; transform:translateY(22px);
transition:opacity .7s cubic-bezier(.16,.8,.3,1), transform .7s cubic-bezier(.16,.8,.3,1);
}
.reveal.is-visible{opacity:1; transform:translateY(0);}
.reveal-delay{transition-delay:.12s;}
.reveal-delay2{transition-delay:.24s;}

/* ---------- Problem ---------- */
#problem{background:var(--paper-deep); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
.problem-grid{display:grid; grid-template-columns:1fr 1fr; gap:56px; align-items:start;}
.problem-grid p{color:var(--ink-soft); margin-bottom:18px;}
.problem-grid p:last-child{margin-bottom:0;}

.pull-card{
background:var(--paper);
border:1px solid var(--line-strong);
padding:32px 28px;
position:relative;
}
.pull-mark{
width:34px; height:34px;
background:var(--gradient);
mask:radial-gradient(circle at 30% 30%, #000 0 40%, transparent 41%) , none;
-webkit-mask:radial-gradient(circle at 30% 30%, #000 0 40%, transparent 41%);
opacity:0.9;
margin-bottom:18px;
}
.pull-quote{
font-family:var(--font-display); font-style:italic; font-weight:400;
font-size:20px; line-height:1.45; color:var(--ink);
}
.pull-attr{
margin-top:16px; font-family:var(--font-mono); font-size:11.5px;
color:var(--ink-faint); letter-spacing:0.02em;
}

/* ---------- Approach: metric domains + gauges ---------- */
.metric-domain{margin-top:8px; padding-top:32px; border-top:1px solid var(--line);}
.metric-domain:first-of-type{margin-top:0;}
.metric-domain-label{
font-family:var(--font-mono); font-size:11.5px; letter-spacing:0.1em; text-transform:uppercase;
color:var(--ink-faint); margin-bottom:22px;
}
.metric-grid{display:grid; grid-template-columns:1fr 1fr; gap:1px; background:var(--line);}
.metric-grid-single{grid-template-columns:1fr;}
.metric-card{
background:var(--paper);
padding:30px 26px 34px;
}
.metric-gauge{
position:relative; width:76px; height:76px; margin-bottom:20px;
}
.metric-gauge svg{width:100%; height:100%; transform:rotate(-90deg);}
.gauge-track{
fill:none; stroke:var(--line); stroke-width:8;
}
.gauge-fill{
fill:none; stroke:var(--metric-color, var(--g2)); stroke-width:8; stroke-linecap:round;
}
.gauge-num{
position:absolute; inset:0; display:flex; align-items:center; justify-content:center;
font-family:var(--font-mono); font-size:16px; font-weight:600; color:var(--ink);
}
.metric-card h3{
font-family:var(--font-display); font-weight:500; font-size:21px; margin-bottom:10px;
}
.metric-q{
font-family:var(--font-body); font-style:italic; color:var(--ink);
font-size:16px; margin-bottom:10px;
}
.metric-d{color:var(--ink-soft); font-size:15px;}
.approach-foot{
margin-top:40px; font-family:var(--font-mono); font-size:12.5px; letter-spacing:0.03em;
color:var(--ink-faint); border-top:1px solid var(--line); padding-top:22px;
}

/* ---------- Viva flow ---------- */
#viva{background:var(--navy); color:var(--paper-on-navy);}
#viva .section-num{color:rgba(239,233,217,0.55);}
#viva h2{color:var(--paper-on-navy);}
.viva-flow{
position:relative; margin-top:16px;
display:grid; grid-template-columns:repeat(3,1fr); gap:36px;
}
.viva-connector{
position:absolute; top:16px; left:0; width:100%; height:20px;
overflow:visible; z-index:0; pointer-events:none;
display:none;
}
.viva-connector line{
stroke:rgba(239,233,217,0.25); stroke-width:1.5;
}
.viva-step{
position:relative; z-index:1;
background:var(--navy-soft);
border:1px solid rgba(239,233,217,0.14);
padding:28px 24px 30px;
}
.viva-step-num{
font-family:var(--font-mono); font-size:11px; letter-spacing:0.08em;
color:var(--metric-color, rgba(239,233,217,0.45));
margin-bottom:14px;
}
.viva-tag{
display:inline-block; font-family:var(--font-mono); font-size:10.5px; letter-spacing:0.06em; text-transform:uppercase;
color:var(--navy); background:var(--metric-color, var(--paper-on-navy));
padding:3px 8px; margin-bottom:14px;
}
.viva-step h3{
font-family:var(--font-display); font-weight:500; font-size:20px; margin-bottom:10px; color:var(--paper-on-navy);
}
.viva-step p{font-size:15px; color:rgba(239,233,217,0.68); line-height:1.6;}
.viva-step em{font-style:italic; color:rgba(239,233,217,0.9);}

@media (min-width:861px){
.viva-connector{display:block;}
}

/* ---------- Viva demo: interactive chat playback ---------- */
#viva-demo{background:var(--paper-deep); border-top:1px solid var(--line); border-bottom:1px solid var(--line);}
.demo-shell{margin-top:8px;}
.demo-tabs{
display:flex; gap:10px; margin-bottom:0; flex-wrap:wrap;
}
.demo-tab{
display:flex; align-items:center; gap:9px;
font-family:var(--font-mono); font-size:12.5px; letter-spacing:0.02em;
background:var(--paper); border:1px solid var(--line-strong); border-bottom:none;
padding:13px 18px; cursor:pointer; color:var(--ink-soft);
position:relative; top:1px;
transition:color .2s ease, background .2s ease;
}
.demo-tab-dot{
width:8px; height:8px; border-radius:50%; background:var(--dot-color, var(--g2)); flex-shrink:0;
}
.demo-tab-sub{
color:var(--ink-faint); font-size:11px; letter-spacing:0.04em;
}
.demo-tab.is-active{
background:var(--navy); color:var(--paper-on-navy); border-color:var(--navy);
}
.demo-tab.is-active .demo-tab-sub{color:rgba(239,233,217,0.55);}
.demo-tab:not(.is-active):hover{color:var(--ink);}

.demo-window{
background:var(--navy); border:1px solid var(--navy);
padding:0;
}
.demo-window-head{
display:flex; align-items:center; justify-content:space-between; gap:16px;
padding:16px 20px; border-bottom:1px solid rgba(239,233,217,0.14);
}
.demo-window-title{
font-family:var(--font-mono); font-size:12px; letter-spacing:0.02em; color:rgba(239,233,217,0.75);
}
.demo-replay{
display:flex; align-items:center; gap:6px;
font-family:var(--font-mono); font-size:11.5px; letter-spacing:0.04em; text-transform:uppercase;
background:transparent; border:1px solid rgba(239,233,217,0.3); color:rgba(239,233,217,0.75);
padding:7px 12px; cursor:pointer; transition:border-color .2s ease, color .2s ease; flex-shrink:0;
}
.demo-replay:hover{border-color:var(--paper-on-navy); color:var(--paper-on-navy);}

.demo-thread{
padding:26px 22px; min-height:420px; max-height:520px; overflow-y:auto;
display:flex; flex-direction:column; gap:14px;
}
.demo-row{display:flex;}
.demo-row-ai{justify-content:flex-start;}
.demo-row-student{justify-content:flex-end;}
.demo-col{
display:flex; flex-direction:column; gap:7px;
max-width:78%;
}
.demo-row-student .demo-col{align-items:flex-end;}
.demo-bubble{
background:var(--navy-soft);
border-left:3px solid var(--bubble-color, transparent);
padding:12px 16px;
font-size:14.5px; line-height:1.55; color:rgba(239,233,217,0.9);
}
.demo-row-student .demo-bubble{
border-left:none; border-right:3px solid rgba(239,233,217,0.3);
background:rgba(239,233,217,0.06);
}
.demo-bubble-name{
font-family:var(--font-mono); font-size:10.5px; letter-spacing:0.06em; text-transform:uppercase;
color:var(--bubble-color, rgba(239,233,217,0.5)); margin-bottom:5px;
}
.demo-row-student .demo-bubble-name{color:rgba(239,233,217,0.45);}

.demo-flag{
display:inline-flex; align-items:center; gap:6px;
font-family:var(--font-mono); font-size:10.5px; letter-spacing:0.03em;
color:var(--bubble-color, var(--g1));
border:1px solid var(--bubble-color, var(--g1));
padding:5px 10px;
}

.demo-typing{
display:flex; align-items:center; gap:4px; padding:14px 16px;
}
.demo-typing span{
width:6px; height:6px; border-radius:50%; background:rgba(239,233,217,0.5);
animation:demoTyping 1s ease-in-out infinite;
}
.demo-typing span:nth-child(2){animation-delay:.15s;}
.demo-typing span:nth-child(3){animation-delay:.3s;}
@keyframes demoTyping{
0%, 60%, 100%{ transform:translateY(0); opacity:0.5; }
30%{ transform:translateY(-4px); opacity:1; }
}

@media (max-width:640px){
.demo-col{max-width:90%;}
.demo-window-head{flex-direction:column; align-items:flex-start; gap:10px;}
}

/* ---------- Moat / cost list ---------- */
#moat{background:var(--paper); border-bottom:1px solid var(--line);}
.cost-list{display:grid; gap:0;}
.cost-item{
display:grid; grid-template-columns:14px 1fr; gap:18px;
padding:20px 0; border-top:1px solid var(--line-strong);
}
.cost-item:last-child{border-bottom:1px solid var(--line-strong);}
.cost-mark{
width:10px; height:10px; margin-top:6px;
background:var(--gradient);
border-radius:1px;
}
.cost-item h4{
font-family:var(--font-display); font-weight:500; font-size:16.5px; margin-bottom:4px;
}
.cost-item p{color:var(--ink-soft); font-size:14.5px;}

/* ---------- Roadmap ---------- */
#roadmap{background:var(--navy); color:var(--paper-on-navy);}
#roadmap .section-num{color:rgba(239,233,217,0.55);}
#roadmap h2{color:var(--paper-on-navy);}
.phases{display:grid; grid-template-columns:repeat(3,1fr); gap:1px; background:rgba(239,233,217,0.15); margin-top:8px; border:1px solid rgba(239,233,217,0.15);}
.phase{background:var(--navy); padding:32px 26px;}
.phase-tag{
font-family:var(--font-mono); font-size:11.5px; letter-spacing:0.08em; text-transform:uppercase;
color:transparent; background:var(--gradient); -webkit-background-clip:text; background-clip:text;
margin-bottom:16px; display:inline-block; font-weight:600;
}
.phase h3{font-family:var(--font-display); font-weight:400; font-size:21px; margin-bottom:12px; color:var(--paper-on-navy);}
.phase p{font-size:15px; color:rgba(239,233,217,0.65); line-height:1.6;}
.phase-status{
margin-top:20px; font-family:var(--font-mono); font-size:11px; letter-spacing:0.06em; text-transform:uppercase;
color:rgba(239,233,217,0.4);
}

/* ---------- Team ---------- */
.team-list{margin-top:8px;}
.team-item{
display:grid; grid-template-columns:1fr 2fr; gap:24px;
padding:26px 0; border-top:1px solid var(--line);
align-items:baseline;
}
.team-item:last-child{border-bottom:1px solid var(--line);}
.team-name{font-family:var(--font-display); font-size:19px; font-weight:500;}
.team-role{font-family:var(--font-mono); font-size:11.5px; letter-spacing:0.06em; text-transform:uppercase; color:var(--ink-faint); display:block; margin-top:4px;}
.team-bio{color:var(--ink-soft); font-size:15.5px;}

/* ---------- Contact ---------- */
#contact{background:var(--paper-deep); border-top:1px solid var(--line);}
.contact-grid{display:grid; grid-template-columns:1fr 1fr; gap:60px; align-items:start;}
.contact-copy p{color:var(--ink-soft); margin-top:14px;}
.contact-options{margin-top:28px; display:grid; gap:14px;}
.contact-option{
font-family:var(--font-mono); font-size:13px; padding:14px 0; border-top:1px solid var(--line-strong);
display:flex; justify-content:space-between; text-decoration:none; color:var(--ink);
}
.contact-option:last-child{border-bottom:1px solid var(--line-strong);}
.contact-option span.arrow{color:var(--g2); transition:transform .2s ease;}
.contact-option:hover span.arrow{transform:translateX(4px);}

form{display:grid; gap:16px;}
label{font-family:var(--font-mono); font-size:11.5px; letter-spacing:0.06em; text-transform:uppercase; color:var(--ink-faint); display:block; margin-bottom:6px;}
input, textarea, select{
width:100%; background:transparent; border:none; border-bottom:1px solid var(--line-strong);
font-family:var(--font-body); font-size:16px; color:var(--ink); padding:8px 2px;
}
input:focus, textarea:focus, select:focus{outline:none; border-bottom-color:var(--g2);}
textarea{resize:vertical; min-height:80px;}
.field{margin-bottom:2px;}
.submit-btn{
margin-top:10px; justify-self:start;
font-family:var(--font-mono); font-size:13px; letter-spacing:0.05em; text-transform:uppercase;
padding:13px 26px; background:var(--ink); color:var(--paper); border:none; cursor:pointer;
transition:background .2s ease;
}
.submit-btn:hover{background:var(--navy);}

/* ---------- Footer (unchanged) ---------- */
footer{background:var(--navy); color:rgba(239,233,217,0.55); padding:40px 0 28px;}
.footer-grid{display:flex; justify-content:space-between; align-items:flex-end; flex-wrap:wrap; gap:24px;}
.footer-mark{font-family:var(--font-display); font-size:16px; color:var(--paper-on-navy); letter-spacing:0.08em;}
.footer-links{display:flex; gap:22px; font-family:var(--font-mono); font-size:11.5px; text-transform:uppercase; letter-spacing:0.06em;}
.footer-links a{text-decoration:none; color:rgba(239,233,217,0.55);}
.footer-links a:hover{color:var(--paper-on-navy);}
.footer-note{font-family:var(--font-mono); font-size:11px; color:rgba(239,233,217,0.35); margin-top:24px;}

/* ---------- Responsive ---------- */
@media (max-width: 860px){
.problem-grid, .contact-grid{grid-template-columns:1fr;}
.phases{grid-template-columns:1fr;}
.metric-grid{grid-template-columns:1fr;}
.viva-flow{grid-template-columns:1fr; gap:18px;}
.team-item{grid-template-columns:1fr;}
nav{display:none;}
.nav-toggle{display:block;}
.mobile-nav{display:flex;}
.masthead-strip{flex-direction:column; gap:4px;}
.hero{padding:64px 24px 96px; min-height:100vh;}
}