/* ============================================================
   TopMVA — editorial / academic stylesheet
   Flat, typographic, hairline rules. No cards, gradients, or shadows.
   System fonts only (no external requests).
   ============================================================ */
:root{
  --paper:#f5efe1;      /* cream — body background */
  --paper-2:#ece3d1;    /* deeper cream — panels / code */
  --ink:#14243d;        /* deep navy — body text */
  --ink-2:#35486a;      /* softer navy */
  --muted:#6f7889;      /* muted slate */
  --line:#ddd5c3;       /* cream hairline */
  --line-2:#c9bea6;
  --accent:#9c7a24;     /* gold — links & accents on cream */
  --navy:#14243d;       /* deep navy — nav / footer backgrounds */
  --navy-2:#0e1b30;
  --gold:#c9a24a;       /* brighter gold — framing / accents on navy */
  --cream:#f4ecdb;      /* cream text on navy */
  --maxw:1080px;
  --serif:Georgia,'Iowan Old Style','Palatino Linotype','Times New Roman',serif;
  --sans:system-ui,-apple-system,'Segoe UI',Roboto,Helvetica,Arial,sans-serif;
  --mono:ui-monospace,'SF Mono',Menlo,Consolas,'Liberation Mono',monospace;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;background:var(--paper);color:var(--ink);
  font-family:var(--sans);font-size:17px;line-height:1.65;-webkit-font-smoothing:antialiased;
}
.serif{font-family:var(--serif)}
.mono{font-family:var(--mono)}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--serif);font-weight:400;line-height:1.14;letter-spacing:-.01em;margin:0}
h1{font-size:clamp(2.4rem,5.5vw,4rem)}
h2{font-size:clamp(1.7rem,3.2vw,2.5rem)}
h3{font-size:1.35rem}
h1 em,h2 em,.lead em{font-style:italic;color:var(--accent)}
p{margin:0 0 1rem}
.wrap{max-width:var(--maxw);margin:0 auto;padding:0 32px}
.muted{color:var(--muted)}
.eyebrow{font-family:var(--sans);font-size:.7rem;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--accent)}

/* ---------- NAV ---------- */
header.nav{position:sticky;top:0;z-index:50;background:rgba(14,27,48,.95);backdrop-filter:blur(8px);border-bottom:1px solid rgba(201,162,74,.45)}
.nav-inner{display:flex;align-items:baseline;gap:30px;height:66px;max-width:var(--maxw);margin:0 auto;padding:0 32px}
.brand{font-family:var(--serif);font-size:1.3rem;font-weight:400;letter-spacing:-.01em;text-decoration:none;cursor:pointer;align-self:center;color:var(--cream)}
.brand .mark{display:none}            /* drop the boxed monogram for an editorial wordmark */
nav.links{display:flex;gap:22px;margin-left:auto;flex-wrap:wrap;align-items:baseline}
nav.links a{position:relative;font-size:.82rem;color:#c3cbd9;text-decoration:none;cursor:pointer;white-space:nowrap;padding:4px 0}
nav.links a:before{content:attr(data-n);font-family:var(--mono);font-size:.66rem;color:#8a93a6;margin-right:6px}
nav.links a:hover{color:var(--gold)}
nav.links a.active{color:#fff;box-shadow:inset 0 -1px 0 var(--gold)}
.menu-btn{display:none;margin-left:auto;align-self:center;background:none;border:1px solid rgba(201,162,74,.5);color:var(--cream);border-radius:4px;padding:6px 9px;cursor:pointer;font-size:1rem}
@media(max-width:820px){
  nav.links{display:none;position:absolute;top:66px;left:0;right:0;flex-direction:column;gap:0;background:var(--navy);padding:8px 0;border-bottom:1px solid rgba(201,162,74,.35)}
  nav.links.open{display:flex}
  nav.links a{padding:12px 32px}
  .menu-btn{display:block}
}

/* ---------- LAYOUT ---------- */
.view{display:none}
.view.active{display:block;animation:fade .35s ease}
@keyframes fade{from{opacity:0;transform:translateY(5px)}to{opacity:1;transform:none}}
section{padding:62px 0}
.section-num{font-family:var(--mono);font-size:.72rem;color:var(--accent);display:block;margin-bottom:10px;letter-spacing:.05em}

/* links / actions — understated, editorial */
.btn{display:inline-flex;align-items:center;gap:7px;font-family:var(--sans);font-size:.92rem;font-weight:500;cursor:pointer;text-decoration:none;transition:.15s;border:none;background:none;padding:0}
.btn-primary{color:var(--ink);border-bottom:1.5px solid var(--accent);padding-bottom:2px;border-radius:0}
.btn-primary:hover{color:var(--accent)}
.btn-ghost{color:var(--ink-2);border-bottom:1.5px solid var(--line-2);padding-bottom:2px}
.btn-ghost:hover{color:var(--ink);border-color:var(--ink)}
/* a couple places want a real button feel (downloads) */
.btn.solid{padding:10px 18px;border:1px solid var(--ink);border-radius:3px;font-weight:600;border-bottom-width:1px}
.btn.solid:hover{background:var(--ink);color:var(--paper)}

.card{background:none;border:none;border-radius:0}
.pill{display:inline-block;font-family:var(--sans);font-size:.66rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);padding:0;border:none;background:none}
.pill + .pill:before{content:"·";margin:0 7px 0 1px;color:var(--line-2)}
.pill.p1{color:var(--accent)}
.pill.p2,.pill.p3{color:var(--muted)}

/* ---------- HERO ---------- */
.hero{padding:88px 0 40px}
.hero h1{max-width:16ch;margin-bottom:22px}
.hero p.lead{font-size:1.2rem;max-width:60ch;color:var(--ink-2);font-family:var(--serif)}
.hero p.lead strong{font-weight:600;color:var(--ink)}
.hero-actions{display:flex;gap:26px;flex-wrap:wrap;margin-top:30px}

/* stats — bare numerals, like the original */
.stat-row{display:flex;gap:0;flex-wrap:wrap;margin-top:64px;border-top:1px solid var(--line)}
.stat{padding:26px 40px 0 0}
.stat .n{font-family:var(--serif);font-size:2.6rem;line-height:1;color:var(--ink)}
.stat .l{font-size:.8rem;color:var(--muted);margin-top:8px;max-width:16ch}

/* two-col + generic text sections */
.two-col{display:grid;grid-template-columns:1.25fr .9fr;gap:56px;align-items:start}
@media(max-width:820px){.two-col{grid-template-columns:1fr;gap:30px}}
.feature{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:0}
.feature .card{padding:24px 26px 24px 0}
.feature .ic{display:none}
.feature h3{margin-bottom:8px}

/* ---------- STAGES (was .flow cards) ---------- */
.flow{display:block;margin-top:32px;border-top:1px solid var(--line)}
.flow-step{display:grid;grid-template-columns:auto 1fr;gap:26px;align-items:baseline;padding:22px 0;border-bottom:1px solid var(--line);cursor:pointer;position:relative;transition:.15s}
.flow-step:hover{padding-left:8px}
.flow-step .step-n{font-family:var(--mono);font-size:.72rem;color:var(--accent);white-space:nowrap;letter-spacing:.04em}
.flow-step h4{font-size:1.2rem;margin-bottom:4px}
.flow-step p{font-size:.92rem;color:var(--muted);margin:0;max-width:60ch}
.flow-step .arrow{display:none}

/* ---------- SKILL LIBRARY ---------- */
.lib{display:grid;grid-template-columns:240px 1fr;gap:48px;margin-top:30px;align-items:start}
@media(max-width:880px){.lib{grid-template-columns:1fr;gap:24px}}
.skill-list{display:flex;flex-direction:column;position:sticky;top:84px;border-top:1px solid var(--line)}
@media(max-width:880px){.skill-list{position:static;border-top:none}}
.skill-item{text-align:left;padding:15px 0;border:none;border-bottom:1px solid var(--line);background:none;cursor:pointer;transition:.12s}
.skill-item:hover{padding-left:6px}
.skill-item.on .si-name{color:var(--accent)}
.skill-item.on .si-stage{color:var(--accent)}
.skill-item .si-stage{font-family:var(--mono);font-size:.64rem;letter-spacing:.04em;color:var(--muted);display:block}
.skill-item .si-name{font-family:var(--serif);font-size:1.04rem;margin-top:4px;display:block;color:var(--ink)}
.skill-detail{min-width:0}
.sd-head{margin-bottom:6px}
.sd-meta{margin:12px 0}
.kv{display:grid;grid-template-columns:118px 1fr;gap:8px 18px;font-size:.88rem;margin:18px 0;padding:16px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.kv .key{color:var(--muted)}
.sd-actions{display:flex;gap:22px;flex-wrap:wrap;align-items:center;margin:18px 0}
.badge-note{display:block;font-size:.78rem;color:var(--muted);margin-top:4px}

/* download manifest — what's inside the .skill bundle */
.manifest{margin:18px 0 0;padding:16px 0 0;border-top:1px solid var(--line);max-width:60ch}
.filelist{list-style:none;margin:10px 0 0;padding:0}
.filelist li{display:flex;flex-wrap:wrap;gap:4px 12px;align-items:baseline;padding:7px 0;border-bottom:1px dotted var(--line)}
.filelist li:last-child{border-bottom:none}
.filelist code{font-family:var(--mono);font-size:.8rem;color:var(--ink);background:var(--paper-2);border:1px solid var(--line);padding:1px 6px;border-radius:3px;white-space:nowrap}
.filelist li span{color:var(--muted);font-size:.86rem}
.manifest .badge-note{margin-top:12px}

/* code preview — light, bookish (not a dark terminal) */
.codewrap{background:var(--paper-2);border:1px solid var(--line);border-radius:4px;overflow:hidden;margin-top:14px}
.codehead{display:flex;align-items:center;gap:8px;padding:9px 14px;background:none;border-bottom:1px solid var(--line)}
.codehead .dot{display:none}
.codehead .fn{font-family:var(--mono);font-size:.74rem;color:var(--muted)}
.codehead .copy{margin-left:auto;font-size:.72rem;color:var(--accent);background:none;border:none;cursor:pointer;font-weight:600}
.codehead .copy:hover{text-decoration:underline}
pre.code{margin:0;padding:20px;overflow:auto;font-family:var(--mono);font-size:.76rem;line-height:1.75;color:var(--ink-2);max-height:520px;background:none}
pre.code .h{color:var(--accent);font-weight:600}
pre.code .k{color:#7a5a2c}
pre.code .y{color:#3f6b4f}

/* ---------- PRINCIPLES (was cards) ---------- */
.principles{display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));gap:0;margin-top:30px;border-top:1px solid var(--line)}
.principle{padding:24px 28px 24px 0;border-bottom:1px solid var(--line)}
.principle .num{font-family:var(--serif);font-size:1.5rem;color:var(--accent)}
.principle h4{margin:8px 0 8px;font-size:1.12rem}
.principle p{font-size:.9rem;color:var(--muted);margin:0}

/* ---------- STEPS ---------- */
.steps{counter-reset:s;display:block;margin-top:28px;max-width:760px;border-top:1px solid var(--line)}
.step{display:grid;grid-template-columns:44px 1fr;gap:20px;align-items:start;padding:22px 0;border-bottom:1px solid var(--line)}
.step:before{counter-increment:s;content:counter(s,decimal-leading-zero);font-family:var(--mono);font-size:.9rem;color:var(--accent);padding-top:3px}
.step h4{font-size:1.1rem;margin-bottom:4px}
.step p{font-size:.92rem;color:var(--ink-2);margin:0}
.step code{font-family:var(--mono);font-size:.84em;background:var(--paper-2);border:1px solid var(--line);padding:1px 5px;border-radius:3px}

/* ---------- PROSE / MISC ---------- */
.prose{max-width:68ch}
.prose h3{margin:30px 0 10px}
blockquote{margin:24px 0;padding:0 0 0 24px;border-left:2px solid var(--accent);font-family:var(--serif);font-size:1.2rem;font-style:italic;color:var(--ink-2)}
.callout{padding:18px 22px;border:1px solid var(--line-2);border-radius:4px;background:var(--paper-2);font-size:.9rem;color:var(--ink-2);margin-top:22px}

/* ---------- FOOTER ---------- */
footer{background:var(--navy);border-top:2px solid var(--gold);padding:48px 0 60px;margin-top:50px;font-size:.85rem;color:#aab3c6}
.footer-inner{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:32px}
@media(max-width:760px){.footer-inner{grid-template-columns:1fr 1fr}}
.footer-inner h5{font-family:var(--sans);font-size:.68rem;text-transform:uppercase;letter-spacing:.14em;color:var(--cream);margin:0 0 12px;font-weight:700}
.footer-inner a{display:block;color:#aab3c6;text-decoration:none;padding:3px 0;cursor:pointer}
.footer-inner a:hover{color:var(--gold)}
.footer-lead{font-family:var(--serif);font-size:1rem;color:#c3cbd9;max-width:34ch}

/* toast */
.toast{position:fixed;bottom:26px;left:50%;transform:translateX(-50%) translateY(20px);background:var(--ink);color:var(--paper);padding:11px 20px;border-radius:4px;font-size:.85rem;opacity:0;pointer-events:none;transition:.25s;z-index:200}
.toast.show{opacity:1;transform:translateX(-50%) translateY(0)}

/* ============================================================
   MOTION & INTERACTIVITY  (vanilla, CSP-safe, reduced-motion aware)
   ============================================================ */
@media (prefers-reduced-motion: no-preference){
  html.anim [data-reveal]{opacity:0;transform:translateY(16px)}
  html.anim [data-reveal].in{opacity:1;transform:none;
    transition:opacity .7s cubic-bezier(.2,.7,.2,1), transform .7s cubic-bezier(.2,.7,.2,1)}
  html.anim .view.active .hero .wrap > *{animation:rise .7s cubic-bezier(.2,.7,.2,1) both}
  html.anim .view.active .hero .wrap > *:nth-child(2){animation-delay:.05s}
  html.anim .view.active .hero .wrap > *:nth-child(3){animation-delay:.10s}
  html.anim .view.active .hero .wrap > *:nth-child(4){animation-delay:.16s}
  html.anim .view.active .hero .wrap > *:nth-child(5){animation-delay:.22s}
}
@keyframes rise{from{opacity:0;transform:translateY(16px)}to{opacity:1;transform:none}}

/* hero — subtle life */
.hero{position:relative;overflow:hidden}
.hero:before{content:"";position:absolute;z-index:0;width:520px;height:520px;right:-140px;top:-180px;border-radius:50%;
  background:radial-gradient(circle at center, rgba(201,162,74,.16), rgba(201,162,74,0) 70%);animation:drift 18s ease-in-out infinite alternate}
@keyframes drift{from{transform:translate(0,0) scale(1)}to{transform:translate(-46px,34px) scale(1.1)}}
.hero .wrap{position:relative;z-index:1}
.hero h1 em{position:relative;display:inline-block}
.hero h1 em:after{content:"";position:absolute;left:0;right:0;bottom:.02em;height:2px;background:var(--accent);
  transform:scaleX(0);transform-origin:left;animation:draw .9s .55s cubic-bezier(.2,.7,.2,1) forwards}
@keyframes draw{to{transform:scaleX(1)}}
@media (prefers-reduced-motion: reduce){.hero:before,.hero h1 em:after{animation:none}.hero h1 em:after{transform:scaleX(1)}}

/* micro-interactions */
.flow-step{transition:padding-left .2s ease, background .2s ease}
.flow-step:hover{background:linear-gradient(90deg, rgba(201,162,74,.07), transparent 65%)}
.skill-item{transition:padding-left .15s ease}
.btn,.btn-primary,.btn-ghost{transition:color .15s, border-color .15s}

/* ---- interactive "see a skill work" demo ---- */
.demo{margin-top:28px;border:1px solid var(--line);border-radius:6px;overflow:hidden;background:#fffdf8}
.demo-tabs{display:flex;flex-wrap:wrap;border-bottom:1px solid var(--line)}
.demo-tab{font-family:var(--sans);font-size:.82rem;font-weight:500;padding:12px 18px;cursor:pointer;color:var(--muted);
  border:none;background:none;border-bottom:2px solid transparent;transition:.15s}
.demo-tab:hover{color:var(--ink)}
.demo-tab.on{color:var(--ink);border-bottom-color:var(--accent)}
.demo-grid{display:grid;grid-template-columns:1fr 1fr}
@media(max-width:720px){.demo-grid{grid-template-columns:1fr}}
.demo-col{padding:18px 20px;min-width:0}
.demo-col:first-child{border-right:1px solid var(--line);background:var(--paper-2)}
@media(max-width:720px){.demo-col:first-child{border-right:none;border-bottom:1px solid var(--line)}}
.demo-label{font-family:var(--sans);font-size:.66rem;font-weight:600;letter-spacing:.12em;text-transform:uppercase;
  color:var(--muted);margin-bottom:10px;display:flex;justify-content:space-between;align-items:center}
.demo-run{color:var(--accent);cursor:pointer;font-size:.72rem;letter-spacing:.03em;text-transform:none}
.demo-run:hover{text-decoration:underline}
.demo-pre{margin:0;font-family:var(--mono);font-size:.75rem;line-height:1.7;color:var(--ink-2);white-space:pre-wrap;
  word-break:break-word;min-height:230px}
.demo-pre.out{color:var(--ink)}
.demo-pre.typing:after{content:"▋";color:var(--accent);animation:blink 1s steps(1) infinite;margin-left:1px}
@keyframes blink{50%{opacity:0}}