/* ======================================================================
   Skolkovo MBA-17 Recap — shared editorial design system
   Based on M1 Economics & Global Development longread
====================================================================== */
:root{
  --bg:#F5F1E8; --ink:#14110F; --ink2:#2B2622; --muted:#6B5E54;
  --rule:#CEC4B0; --accent:#7A1F2B; --accent2:#294155; --cream:#FAF6EC;
  --green:#2F5A3E;
  --serif:"Fraunces",Georgia,serif; --sans:"Inter",-apple-system,sans-serif;
  --mono:"JetBrains Mono",ui-monospace,monospace;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--ink);font-family:var(--serif);font-weight:400;line-height:1.65;font-size:18px;-webkit-font-smoothing:antialiased;overflow-x:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}

/* NAV */
.topnav{position:fixed;top:0;left:0;right:0;background:rgba(245,241,232,.92);backdrop-filter:blur(14px);z-index:100;border-bottom:1px solid var(--rule);padding:14px 28px;display:flex;justify-content:space-between;align-items:center;font-family:var(--sans);font-size:12px;letter-spacing:.12em;text-transform:uppercase;gap:14px}
.topnav .brand{font-weight:600;white-space:nowrap}
.topnav .brand a{display:inline-block}
.topnav .meta{color:var(--muted);font-variant-numeric:tabular-nums;white-space:nowrap}
.topnav .nav-links{display:flex;gap:18px;color:var(--muted)}
.topnav .nav-links a{cursor:pointer;transition:color .2s}
.topnav .nav-links a:hover{color:var(--accent)}
.topnav .burger{display:none;background:none;border:1px solid var(--rule);padding:8px 12px;font-family:var(--sans);font-size:11px;letter-spacing:.15em;text-transform:uppercase;color:var(--ink);cursor:pointer;font-weight:600;border-radius:2px}
.mobile-drawer{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(245,241,232,.98);backdrop-filter:blur(20px);z-index:99;padding:80px 30px 30px;flex-direction:column;gap:4px;font-family:var(--sans);overflow-y:auto}
.mobile-drawer.open{display:flex}
.mobile-drawer a{display:block;padding:18px 0;border-bottom:1px solid var(--rule);font-size:18px;color:var(--ink);letter-spacing:.02em;text-transform:none;cursor:pointer}
.mobile-drawer a:last-child{border-bottom:none}
@media (max-width:900px){
  .topnav .nav-links{display:none}
  .topnav .meta{display:none}
  .topnav .burger{display:block}
}

/* HERO */
.hero{min-height:100vh;padding:120px 40px 120px;display:flex;flex-direction:column;justify-content:center;align-items:center;position:relative;background:linear-gradient(180deg,#F5F1E8 0%,#EFEADC 100%)}
.hero .hero-inner{max-width:1280px;margin:0 auto;width:100%;text-align:center}
.hero .kicker{font-family:var(--sans);font-size:12px;letter-spacing:.3em;text-transform:uppercase;color:var(--accent);font-weight:600;text-align:center;display:block}
.hero h1{font-family:var(--serif);font-weight:300;font-size:clamp(44px,7vw,104px);line-height:1.04;letter-spacing:-.02em;margin:28px auto 40px;font-variation-settings:"opsz" 144;white-space:nowrap;text-align:center}
.hero h1.wrap{white-space:normal}
.hero h1 em{font-style:italic;color:var(--accent);font-weight:400}
.hero .dek{font-family:var(--serif);font-style:italic;font-weight:300;font-size:clamp(20px,2.3vw,30px);line-height:1.5;color:var(--ink2);margin:0 auto;max-width:min(860px,90%);text-align:center}
.hero .byline{position:absolute;bottom:32px;left:40px;right:40px;display:flex;justify-content:center;align-items:center;flex-direction:column;gap:18px;font-family:var(--sans);font-size:13px;color:var(--muted);max-width:1100px;margin:0 auto;width:calc(100% - 80px);text-align:center}
.hero .byline .authors{text-align:center}
.hero .byline .authors b{color:var(--ink);font-weight:600;display:block}
.hero .byline .authors span{display:block;margin-top:3px}
.hero .byline .rule{width:60px;height:1px;background:var(--accent);margin:10px auto}
.hero .scrollcue{font-size:11px;letter-spacing:.25em;text-transform:uppercase;color:var(--muted);text-align:center}

/* Hero-embedded 3-CTA grid — uses the same .cta panels as #repeat, compacter */
.hero .cta-grid.hero-grid{margin:40px auto 0;max-width:1100px;padding:0 20px;box-sizing:border-box;width:100%;grid-template-columns:repeat(3,1fr);gap:14px}
.hero .cta-grid.hero-grid .cta{padding:24px 22px 22px}
.hero .cta-grid.hero-grid .cta h3{font-size:clamp(18px,1.6vw,23px);margin-bottom:10px;line-height:1.15}
.hero .cta-grid.hero-grid .cta .cta-kicker{font-size:10px;margin-bottom:10px}
.hero .cta-grid.hero-grid .cta p{font-size:13px;line-height:1.45;margin-bottom:14px}
.hero .cta-grid.hero-grid .cta .cta-meta{font-size:10px}
.hero .cta-grid.hero-grid .cta .cta-arrow{top:18px;right:20px;font-size:18px}
@media (max-width:900px){.hero .cta-grid.hero-grid{grid-template-columns:1fr;margin:26px auto 56px;max-width:480px;gap:10px}.hero .cta-grid.hero-grid .cta{padding:22px 22px}}

/* SECTION */
section{padding:100px 40px;position:relative}
.wrap{max-width:860px;margin:0 auto}
.wide{max-width:1200px;margin:0 auto}
.chap{font-family:var(--sans);font-size:11px;letter-spacing:.4em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:24px;display:flex;align-items:center;gap:14px}
.chap::before{content:"";width:40px;height:1px;background:var(--accent)}
h2{font-family:var(--serif);font-weight:400;font-size:clamp(36px,5vw,64px);line-height:1.05;letter-spacing:-.01em;margin:0 0 28px;font-variation-settings:"opsz" 96;text-align:center}
h2 em{font-style:italic;color:var(--accent)}
h3{font-family:var(--serif);font-weight:500;font-size:clamp(22px,2.6vw,32px);line-height:1.2;margin:70px 0 20px;letter-spacing:-.005em;text-align:center}
h4{font-family:var(--sans);font-weight:600;font-size:14px;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin:44px 0 16px;text-align:center}
.lede{font-family:var(--serif);font-size:clamp(22px,2.3vw,28px);line-height:1.45;color:var(--ink2);font-weight:300;margin:0 auto 40px;max-width:720px;font-variation-settings:"opsz" 96;text-align:center}
.chap{justify-content:center}
.chap::after{content:"";width:40px;height:1px;background:var(--accent)}
p{margin:0 0 22px;font-family:var(--serif);font-size:19px;line-height:1.7;color:var(--ink2)}
p.first::first-letter{font-family:var(--serif);font-size:5.4em;line-height:.85;float:left;padding:8px 10px 0 0;font-weight:400;color:var(--accent);font-style:italic}
strong{font-weight:600;color:var(--ink)}
em{font-style:italic}

/* IMAGES */
figure{margin:48px 0;text-align:center}
figure img{border:1px solid var(--rule);box-shadow:0 2px 22px rgba(20,17,15,.06);max-height:720px;margin:0 auto;object-fit:contain;width:auto;max-width:100%}
figure.full{margin-left:calc(50% - 50vw);margin-right:calc(50% - 50vw);width:100vw}
figure.full img{max-height:90vh;width:auto;max-width:90%}
figcaption{font-family:var(--sans);font-size:13px;color:var(--muted);margin-top:14px;letter-spacing:.02em;font-style:italic}

/* PULLQUOTE */
.pullquote{font-family:var(--serif);font-style:italic;font-weight:300;font-size:clamp(28px,3.6vw,44px);line-height:1.25;color:var(--ink);margin:70px 0;padding:30px 0 30px 40px;border-left:3px solid var(--accent);letter-spacing:-.005em;font-variation-settings:"opsz" 96}
.pullquote .who{display:block;font-style:normal;font-family:var(--sans);font-size:13px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-top:20px;font-weight:500}

/* CALLOUT BOX */
.box{background:var(--cream);border:1px solid var(--rule);padding:30px 32px;margin:44px 0;position:relative}
.box .tag{font-family:var(--sans);font-size:11px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;color:var(--accent);margin-bottom:14px;display:inline-block;padding:4px 10px;background:rgba(122,31,43,.08);border-radius:2px}
.box p:last-child{margin-bottom:0}
.box code{font-family:var(--mono);background:rgba(20,17,15,.05);padding:2px 6px;font-size:.85em;border-radius:2px}

/* FRAMEWORK GRID */
.frame-grid{display:flex;flex-wrap:wrap;justify-content:center;margin:36px 0;background:transparent;border:none}
.frame-grid > div{flex:1 1 220px;min-width:220px;max-width:calc(25% + 1px);background:var(--cream);padding:26px 22px;min-height:170px;border:1px solid var(--rule);margin:-1px 0 0 -1px;position:relative;box-sizing:border-box}
.frame-grid > div b{display:block;font-family:var(--serif);font-weight:500;font-size:24px;color:var(--accent);margin-bottom:10px;font-style:italic}
.frame-grid > div p{font-family:var(--sans);font-size:14px;line-height:1.5;color:var(--ink2);margin:0}
@media (max-width:900px){.frame-grid > div{max-width:calc(50% + 1px);flex-basis:260px}}
@media (max-width:520px){.frame-grid > div{max-width:100%;min-height:auto}}

/* STATS */
.stats{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:30px;margin:44px 0;padding:36px 0;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.stats .s{text-align:center}
.stats .s b{display:block;font-family:var(--serif);font-size:clamp(40px,5.5vw,70px);font-weight:300;color:var(--accent);line-height:1;font-variation-settings:"opsz" 144}
.stats .s span{display:block;font-family:var(--sans);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);margin-top:10px;font-weight:500}

/* TABLE */
table{width:100%;border-collapse:collapse;margin:36px 0;font-family:var(--sans);font-size:15px}
th,td{padding:14px 16px;text-align:left;border-bottom:1px solid var(--rule);vertical-align:top}
th{font-weight:600;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}
td:first-child{font-weight:500}

/* CHAPTER INTRO */
.chap-intro{padding:140px 40px 80px;background:linear-gradient(180deg,var(--bg) 0%,var(--cream) 100%);text-align:center;border-top:1px solid var(--rule);border-bottom:1px solid var(--rule)}
.chap-intro .num{font-family:var(--serif);font-style:italic;font-weight:300;font-size:clamp(100px,14vw,200px);line-height:.9;color:var(--accent);opacity:.2;margin-bottom:-40px;font-variation-settings:"opsz" 144}
.chap-intro .label{font-family:var(--sans);font-size:13px;letter-spacing:.3em;text-transform:uppercase;color:var(--muted);margin-bottom:8px}
.chap-intro h2{max-width:860px;margin:0 auto}
.chap-intro .dek{font-family:var(--serif);font-style:italic;color:var(--ink2);margin-top:28px;max-width:680px;margin-left:auto;margin-right:auto;font-size:clamp(18px,2vw,22px);line-height:1.5}

/* FLASHCARDS */
.flash-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:18px;margin:48px 0}
.card{perspective:1000px;height:180px;cursor:pointer}
.card-inner{position:relative;width:100%;height:100%;transition:transform .6s;transform-style:preserve-3d}
.card.flipped .card-inner{transform:rotateY(180deg)}
.card-front,.card-back{position:absolute;width:100%;height:100%;backface-visibility:hidden;padding:24px;display:flex;flex-direction:column;justify-content:center;border:1px solid var(--rule)}
.card-front{background:var(--cream);text-align:center}
.card-front .q{font-family:var(--serif);font-size:22px;line-height:1.3;color:var(--ink);font-style:italic}
.card-front .hint{font-family:var(--sans);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--accent);position:absolute;bottom:14px;left:0;right:0;text-align:center;font-weight:600}
.card-back{background:var(--accent);color:#FAF6EC;transform:rotateY(180deg);text-align:left}
.card-back .a{font-family:var(--sans);font-size:14px;line-height:1.5}
.card-back .term{font-family:var(--serif);font-size:16px;font-weight:600;font-style:italic;margin-bottom:10px;letter-spacing:-.005em}

/* QUIZ */
.quiz{counter-reset:q}
.quiz .q-item{padding:36px 0;border-bottom:1px solid var(--rule);counter-increment:q}
.quiz .q-item:last-child{border-bottom:none}
.quiz .q-item::before{content:counter(q,decimal-leading-zero);display:block;font-family:var(--serif);font-style:italic;font-size:40px;color:var(--accent);margin-bottom:12px;font-weight:300}
.quiz .q-text{font-family:var(--serif);font-size:22px;line-height:1.4;color:var(--ink);margin-bottom:22px;font-weight:400}
.quiz .opts{display:flex;flex-direction:column;gap:10px}
.quiz .opt{padding:14px 20px;border:1px solid var(--rule);background:var(--cream);font-family:var(--sans);font-size:15px;cursor:pointer;text-align:left;transition:all .2s;color:var(--ink2)}
.quiz .opt:hover{border-color:var(--accent);background:#fff}
.quiz .opt.correct{background:var(--green);color:#fff;border-color:var(--green)}
.quiz .opt.wrong{background:#8B1E2B;color:#fff;border-color:#8B1E2B}
.quiz .opt.disabled{cursor:default;pointer-events:none;opacity:.6}
.quiz .opt.correct.disabled,.quiz .opt.wrong.disabled{opacity:1}
.quiz .feedback{margin-top:14px;padding:14px 20px;font-family:var(--sans);font-size:14px;line-height:1.5;background:rgba(122,31,43,.06);border-left:3px solid var(--accent);display:none;color:var(--ink2)}
.quiz .feedback.show{display:block}
.quiz-score{text-align:center;padding:60px 0;font-family:var(--serif)}
.quiz-score b{font-size:clamp(60px,8vw,100px);font-weight:300;color:var(--accent);display:block;font-style:italic;font-variation-settings:"opsz" 144}
.quiz-score span{font-family:var(--sans);font-size:13px;letter-spacing:.2em;text-transform:uppercase;color:var(--muted)}

/* 2-COL */
.twocol{display:grid;grid-template-columns:1.2fr 1fr;gap:48px;margin:48px 0;align-items:start}
.twocol .aside{font-family:var(--sans);font-size:14px;line-height:1.55;background:var(--cream);border:1px solid var(--rule);padding:26px;color:var(--ink2)}
.twocol .aside b{display:block;font-family:var(--serif);font-style:italic;color:var(--accent);font-size:18px;margin-bottom:10px;font-weight:500}
@media (max-width:800px){.twocol{grid-template-columns:1fr}}

.gal{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin:36px 0}
.gal figure{margin:0}
@media (max-width:700px){.gal{grid-template-columns:1fr}}

/* MODULE CARDS (homepage) */
.mod-grid{display:flex;flex-wrap:wrap;justify-content:center;margin:44px 0;background:transparent;border:none}
.mod-card{background:var(--cream);padding:26px 24px 22px;transition:background .2s,transform .2s;cursor:pointer;display:flex;flex-direction:column;position:relative;min-height:260px;flex:1 1 280px;min-width:280px;max-width:calc(25% + 1px);border:1px solid var(--rule);margin:-1px 0 0 -1px;box-sizing:border-box;overflow:hidden}
@media (max-width:1100px){.mod-card{max-width:calc(33.33% + 1px)}}
@media (max-width:800px){.mod-card{max-width:calc(50% + 1px)}}
@media (max-width:520px){.mod-card{max-width:100%;min-width:0}}
.mod-card:hover{background:#fff}
.mod-card .mod-visual{position:absolute;top:20px;right:20px;width:88px;height:58px;background:rgba(122,31,43,.7);border-radius:3px;display:flex;align-items:center;justify-content:center;pointer-events:none;transition:background .2s,transform .2s;z-index:2;box-shadow:0 2px 8px rgba(122,31,43,.14)}
.mod-card .mod-visual svg{width:66px;height:42px;color:#FAF6EC;opacity:.96;transition:opacity .2s}
.mod-card .mod-visual svg *{stroke-width:1.6}
.mod-card:hover .mod-visual{background:rgba(122,31,43,.88);transform:scale(1.04)}
.mod-card .mod-body{flex:1;display:flex;flex-direction:column;position:relative;z-index:1}
.mod-card .mod-title{padding-right:104px;min-height:56px;margin-bottom:10px}
.mod-card .mod-num{margin-top:0;margin-bottom:14px}
.mod-card .mod-num{font-family:var(--serif);font-style:italic;font-weight:300;font-size:13px;letter-spacing:.14em;text-transform:uppercase;color:var(--accent);margin-bottom:10px;font-variation-settings:"opsz" 96}
.mod-card .mod-title{font-family:var(--serif);font-weight:500;font-size:21px;line-height:1.22;color:var(--ink);margin-bottom:0;letter-spacing:-.005em}
.mod-card .mod-idea{font-family:var(--serif);font-style:italic;font-weight:300;font-size:14.5px;line-height:1.45;color:var(--ink2);margin:14px 0 14px;padding:12px 0;border-top:1px solid rgba(122,31,43,.14);border-bottom:1px solid rgba(122,31,43,.14);font-variation-settings:"opsz" 72}
.mod-card .mod-meta{font-family:var(--sans);font-size:12px;color:var(--muted);letter-spacing:.05em;margin-top:auto;line-height:1.5}

/* PODCAST EMBED */
.podcast{max-width:620px;margin:28px auto 0;padding:16px 22px 14px;background:rgba(255,255,255,.55);border:1px solid var(--rule);display:flex;flex-direction:column;align-items:center;gap:9px;border-radius:2px}
.podcast-kicker{font-family:var(--sans);font-size:10.5px;letter-spacing:.28em;text-transform:uppercase;color:var(--accent);font-weight:600}
.podcast-kicker .dot{color:var(--accent);margin-right:6px}
.podcast-meta{font-family:var(--serif);font-style:italic;font-size:12.5px;color:var(--muted);text-align:center;line-height:1.5}
.pp-audio{display:none}
.podcast-player{display:flex;align-items:center;gap:12px;width:100%;padding:4px 0}
.pp-btn{font-family:var(--sans);border:none;cursor:pointer;flex-shrink:0;display:flex;align-items:center;justify-content:center;padding:0;transition:background .15s,color .15s,border-color .15s;font-weight:600;line-height:1}
.pp-play{background:var(--ink);color:#fff;width:34px;height:34px;border-radius:50%;font-size:11px}
.pp-play:hover{background:var(--accent)}
.pp-speed{background:transparent;color:var(--ink);border:1px solid var(--rule);border-radius:17px;height:30px;padding:0 11px;min-width:42px;font-size:12px;font-variant-numeric:tabular-nums;letter-spacing:.02em}
.pp-speed:hover{background:var(--cream);color:var(--accent);border-color:var(--accent)}
.pp-time{font-family:var(--mono);font-size:11px;color:var(--muted);font-variant-numeric:tabular-nums;min-width:38px;text-align:center}
.pp-track{flex:1;height:3px;background:var(--rule);border-radius:2px;cursor:pointer;position:relative;overflow:hidden}
.pp-fill{height:100%;background:var(--accent);width:0;transition:width .08s linear}

/* Large CTA (homepage) */
.cta-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:60px 0}
.cta-grid.two{grid-template-columns:1fr 1fr}
@media (max-width:900px){.cta-grid,.cta-grid.two{grid-template-columns:1fr}}
.cta{display:block;padding:44px 36px;border:1px solid var(--rule);background:var(--cream);transition:background .2s;position:relative;overflow:hidden;cursor:pointer}
.cta:hover{background:#fff}
.cta .cta-kicker{font-family:var(--sans);font-size:11px;letter-spacing:.25em;text-transform:uppercase;color:var(--accent);font-weight:600;margin-bottom:18px;display:block}
.cta h3{font-family:var(--serif);font-weight:400;font-size:clamp(24px,2.4vw,34px);line-height:1.12;letter-spacing:-.01em;margin:0 0 16px;color:var(--ink)}
.cta h3 em{color:var(--accent);font-style:italic}
.cta p{font-family:var(--serif);font-style:italic;font-size:17px;line-height:1.55;color:var(--ink2);margin:0 0 22px}
.cta .cta-meta{font-family:var(--sans);font-size:12px;color:var(--muted);letter-spacing:.08em;text-transform:uppercase}
.cta .cta-arrow{position:absolute;top:32px;right:32px;font-family:var(--serif);font-size:28px;color:var(--accent);transition:transform .3s}
.cta:hover .cta-arrow{transform:translateX(6px)}
@media (max-width:800px){.cta-grid{grid-template-columns:1fr}}

/* FOOTER */
footer{background:var(--ink);color:#CEC4B0;padding:80px 40px 40px;font-family:var(--sans);font-size:14px;line-height:1.6}
footer .wide{display:grid;grid-template-columns:repeat(auto-fit,minmax(240px,1fr));gap:40px}
footer h5{font-family:var(--serif);font-size:22px;color:#F5F1E8;margin-bottom:18px;font-weight:400;font-style:italic}
footer a{color:#CEC4B0;transition:color .2s}
footer a:hover{color:#fff}
footer .bottom{max-width:1200px;margin:50px auto 0;padding-top:30px;border-top:1px solid rgba(206,196,176,.15);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:#8A7F71;display:flex;justify-content:space-between;flex-wrap:wrap;gap:14px}

/* PROGRESS */
.progress{position:fixed;top:0;left:0;height:2px;background:var(--accent);z-index:101;transition:width .1s}

/* ======= FORMULAS — math-style display ======= */
.formula-big{background:linear-gradient(180deg,var(--cream) 0%,#F5EFE0 100%)!important;border:1px solid var(--rule)!important;padding:30px 28px!important;margin:28px auto!important;text-align:center!important;max-width:720px!important;border-radius:2px!important;position:relative;font-family:"Fraunces",Georgia,serif!important;font-size:clamp(18px,2.1vw,24px)!important;line-height:1.6!important;color:var(--ink)!important;font-weight:400!important;font-variation-settings:"opsz" 96}
.formula-big::before{content:"ƒ";position:absolute;top:-14px;left:24px;background:var(--bg);padding:0 10px;font-family:var(--serif);font-style:italic;color:var(--accent);font-size:22px;font-weight:400}
.formula-big strong{color:var(--accent);font-weight:500;font-style:italic}
.formula{background:linear-gradient(180deg,var(--cream) 0%,#F5EFE0 100%);border:1px solid var(--rule);padding:36px 32px 28px;margin:32px auto;text-align:center;max-width:720px;border-radius:2px;position:relative}
.formula::before{content:"ƒ";position:absolute;top:-14px;left:24px;background:var(--bg);padding:0 10px;font-family:var(--serif);font-style:italic;color:var(--accent);font-size:22px;font-weight:400}
.formula-eq{font-family:"Fraunces",Georgia,serif;font-size:clamp(20px,2.2vw,28px);color:var(--ink);line-height:1.6;display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;font-weight:400;font-variation-settings:"opsz" 96}
.formula-eq b{font-weight:500;color:var(--accent);font-style:italic}
.formula-eq i{font-style:italic;color:var(--accent2)}
.formula-eq .op{color:var(--muted);margin:0 4px;font-weight:300}
.frac{display:inline-flex;flex-direction:column;vertical-align:middle;margin:0 6px;text-align:center;line-height:1.1}
.frac .num{padding:0 10px 4px;border-bottom:1.5px solid var(--ink);min-width:60px;font-size:.95em}
.frac .den{padding:4px 10px 0;min-width:60px;font-size:.95em;color:var(--ink2)}
.formula-meaning{font-family:var(--serif);font-style:italic;font-size:15px;color:var(--muted);line-height:1.55;max-width:580px;margin:22px auto 0;font-weight:300;padding-top:18px;border-top:1px solid rgba(122,31,43,.15)}
.formula-meaning b{font-style:normal;color:var(--accent);font-weight:600;text-transform:uppercase;font-family:var(--sans);font-size:11px;letter-spacing:.15em;display:block;margin-bottom:6px}
.formula-vars{display:flex;flex-wrap:wrap;gap:6px 20px;justify-content:center;font-family:var(--sans);font-size:12px;color:var(--muted);line-height:1.55;max-width:720px;margin:14px auto 56px;padding:0 28px;background:transparent;border:none;letter-spacing:.01em;opacity:.7}
.formula-vars span{white-space:nowrap}
.formula-vars span b{color:var(--accent);font-family:var(--serif);font-style:italic;font-weight:500;margin-right:5px;font-size:14px}
.formula-vars span em{font-family:var(--serif);font-style:italic;color:var(--ink2);margin-right:2px}
@media (max-width:700px){
  .formula-vars{font-size:11px;gap:4px 14px;padding:0 18px;margin-bottom:40px}
  .formula-vars span b{font-size:13px}
}

@media (max-width:700px){
  .formula{padding:28px 20px 22px;margin:24px auto}
  .formula-eq{font-size:18px;gap:4px}
  .frac{margin:0 3px}
  .frac .num,.frac .den{padding:0 6px 2px;min-width:40px;font-size:.9em}
  .formula-meaning{font-size:14px;margin-top:16px;padding-top:14px}
}

/* DIV ORNAMENT */
.div{text-align:center;margin:80px 0;color:var(--accent);font-family:var(--serif);font-style:italic;font-size:22px;letter-spacing:.3em}

/* MOBILE */
@media (max-width:700px){
  body{font-size:17px}
  section{padding:60px 22px}
  .hero{padding:100px 22px 180px;min-height:90vh}
  .hero h1{margin:20px 0 24px;line-height:1.04;white-space:normal;font-size:clamp(40px,10vw,64px)}
  .hero .byline{position:absolute;bottom:24px;left:22px;right:22px;width:calc(100% - 44px);padding-top:0;font-size:12px;flex-direction:column;align-items:center;gap:14px;text-align:center}
  .hero .scrollcue{align-self:center;margin-top:20px}
  .chap-intro{padding:90px 22px 60px}
  .chap-intro .num{font-size:110px;margin-bottom:-20px}
  .pullquote{padding:20px 0 20px 20px;font-size:22px;margin:40px 0}
  h2{font-size:clamp(30px,8vw,48px)}
  h3{margin:40px 0 14px;font-size:22px}
  p{font-size:17px;line-height:1.65}
  p.first::first-letter{font-size:4em;padding:6px 8px 0 0}
  .lede{font-size:19px}
  .twocol{gap:26px;margin:30px 0}
  .twocol .aside{padding:22px 20px;font-size:13px}
  .frame-grid{margin:26px 0}
  .frame-grid div{padding:22px 20px;min-height:auto}
  .frame-grid div b{font-size:20px}
  .stats{gap:16px;margin:30px 0;padding:26px 0}
  .stats .s b{font-size:clamp(38px,13vw,56px)}
  .stats .s span{font-size:11px;margin-top:6px}
  figure{margin:30px 0}
  figure.full img{max-width:100%}
  .box{padding:22px 22px;margin:30px 0}
  table{font-size:13px}
  th,td{padding:10px 8px}
  .flash-grid{grid-template-columns:1fr 1fr;gap:12px}
  .card{height:150px}
  .card-front .q{font-size:17px}
  .card-front,.card-back{padding:16px}
  .quiz .q-item{padding:28px 0}
  .quiz .q-item::before{font-size:32px}
  .quiz .q-text{font-size:18px}
  .quiz .opt{padding:12px 16px;font-size:14px}
  footer{padding:60px 24px 30px}
  footer .bottom{font-size:11px}
  .topnav{padding:12px 16px;font-size:11px}
  .topnav .brand{font-size:11px;letter-spacing:.08em}
  .cta{padding:36px 28px}
  .cta .cta-arrow{top:20px;right:20px;font-size:22px}
  .mod-card{padding:22px 20px;min-height:auto}
  .mod-card .mod-visual{width:72px;height:48px;top:16px;right:16px}
  .mod-card .mod-visual svg{width:54px;height:34px}
  .mod-card .mod-title{padding-right:88px;font-size:19px;min-height:auto}
  .mod-card .mod-num{margin-bottom:12px}
  .mod-card .mod-idea{font-size:14px;margin:12px 0;padding:10px 0}
}
@media (max-width:420px){
  .flash-grid{grid-template-columns:1fr}
}