/* ============================================================================
   FairShot — Technicals Textbook styles
   Layered on top of site.css (shares tokens, nav, footer, buttons, aura).
   ============================================================================ */

/* ── Section hero / index header ── */
.tx-hero{padding:150px 0 40px;text-align:center}
.tx-hero h1{font-size:clamp(38px,6vw,68px);margin:18px auto 0;max-width:16ch}
.tx-hero .sub{font-size:clamp(16px,2vw,19px);color:var(--text2);max-width:62ch;margin:22px auto 0}
.tx-stats{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-top:34px}
.tx-stat{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r);padding:14px 22px;backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);box-shadow:var(--float-sm)}
.tx-stat b{font-family:'DM Serif Display',serif;font-size:24px;background:var(--accent-grad);-webkit-background-clip:text;background-clip:text;color:transparent;display:block;line-height:1}
.tx-stat span{font-size:12px;color:var(--text3);text-transform:uppercase;letter-spacing:.05em}

/* ── Syllabus index: modules & chapter cards ── */
.tx-module{padding:46px 0 10px}
.tx-module-head{display:flex;align-items:baseline;gap:14px;margin-bottom:22px;flex-wrap:wrap}
.tx-module-num{font-family:'DM Serif Display',serif;font-size:30px;color:var(--accent);opacity:.6;line-height:1}
.tx-module-head h2{font-size:clamp(24px,3.4vw,34px)}
.tx-module-head p{color:var(--text2);font-size:14.5px;flex-basis:100%;margin-top:2px}

.tx-chapters{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
.tx-card{
  display:flex;gap:16px;align-items:flex-start;text-decoration:none;color:inherit;
  background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r);
  padding:20px 22px;box-shadow:var(--float-sm);
  transition:transform .28s var(--ease-fluid),box-shadow .28s,border-color .28s,background .28s;
}
.tx-card.available:hover{transform:translateY(-4px);box-shadow:var(--float);border-color:var(--border2);background:var(--glass-strong)}
.tx-card .n{font-family:'DM Serif Display',serif;font-size:22px;color:var(--accent);line-height:1;flex-shrink:0;min-width:34px}
.tx-card h3{font-size:16.5px;margin-bottom:5px;display:flex;align-items:center;gap:8px}
.tx-card p{font-size:13px;color:var(--text2);line-height:1.5}
.tx-card.soon{opacity:.58;cursor:default}
.tx-badge{font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.05em;padding:2px 8px;border-radius:999px;border:1px solid var(--glass-border)}
.tx-badge.qn{color:var(--accent);background:color-mix(in srgb,var(--accent) 10%,transparent)}
.tx-badge.soon{color:var(--text3)}
.tx-card .arr{width:16px;height:16px;color:var(--text3);margin-left:auto;flex-shrink:0;transition:transform .25s var(--ease-spring),color .25s}
.tx-card.available:hover .arr{transform:translate(3px,-3px);color:var(--accent)}

/* ── Chapter (teaching) page layout ── */
.tx-page{max-width:780px;margin:0 auto;padding:130px 0 30px}
.tx-breadcrumb{font-size:13px;color:var(--text3);display:flex;gap:8px;flex-wrap:wrap;align-items:center}
.tx-breadcrumb a{color:var(--text2);text-decoration:none}
.tx-breadcrumb a:hover{color:var(--text)}
.tx-breadcrumb .sep{opacity:.5}
.tx-modtag{display:inline-block;margin-top:18px;font-size:12px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--accent);background:var(--glass);border:1px solid var(--glass-border);border-radius:999px;padding:5px 13px}
.tx-page h1{font-size:clamp(30px,5vw,46px);margin:16px 0 0;line-height:1.1}
.tx-meta{margin-top:14px;font-size:13px;color:var(--text3);display:flex;gap:16px;flex-wrap:wrap}
.tx-meta span{display:inline-flex;align-items:center;gap:6px}

/* objectives / takeaways boxes */
.tx-box{background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r);padding:22px 24px;margin:32px 0;box-shadow:var(--float-sm)}
.tx-box h4{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);margin-bottom:12px;font-family:'Inter',sans-serif;font-weight:700}
.tx-box ul{list-style:none;display:flex;flex-direction:column;gap:9px}
.tx-box li{display:flex;gap:10px;font-size:14.5px;color:var(--text2);line-height:1.55}
.tx-box li svg{width:17px;height:17px;color:var(--accent);flex-shrink:0;margin-top:2px}

/* body prose */
.tx-body{font-size:16px;line-height:1.75;color:var(--text2)}
.tx-body h3{font-family:'DM Serif Display',serif;font-weight:400;color:var(--text);font-size:24px;margin:36px 0 12px;line-height:1.2}
.tx-body p{margin:0 0 14px}
.tx-body strong{color:var(--text);font-weight:600}
.tx-body em{color:var(--text);font-style:italic}
.tx-body ul,.tx-body ol{margin:0 0 16px 0;padding-left:0;list-style:none;display:flex;flex-direction:column;gap:9px}
.tx-body ol{counter-reset:li}
.tx-body ul li,.tx-body ol li{position:relative;padding-left:26px;font-size:15.5px}
.tx-body ul li::before{content:"";position:absolute;left:6px;top:11px;width:6px;height:6px;border-radius:50%;background:var(--accent)}
.tx-body ol li{counter-increment:li}
.tx-body ol li::before{content:counter(li);position:absolute;left:0;top:0;font-family:'DM Serif Display',serif;font-size:14px;color:var(--accent);font-weight:400}
.tx-eq{font-family:'DM Serif Display',serif;font-size:19px;color:var(--text);text-align:center;background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r-sm);padding:16px 20px;margin:18px 0}

/* worked example callout */
.tx-example{background:var(--glass-strong);border:1px solid var(--glass-border);border-left:3px solid var(--accent);border-radius:var(--r-sm);padding:20px 22px;margin:22px 0;box-shadow:var(--float-sm)}
.tx-example-label{font-size:11px;font-weight:700;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);margin-bottom:8px}
.tx-example p{font-size:14.5px;margin:0 0 10px}
.tx-example p:last-child{margin-bottom:0}

/* key formulas */
.tx-formulas{margin:32px 0}
.tx-formulas h4{font-size:12px;text-transform:uppercase;letter-spacing:.06em;color:var(--accent);margin-bottom:14px;font-weight:700}
.tx-formula{display:flex;flex-direction:column;gap:3px;background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r-sm);padding:14px 18px;margin-bottom:10px;box-shadow:var(--float-sm)}
.tx-formula .fname{font-size:12.5px;color:var(--text3);text-transform:uppercase;letter-spacing:.04em}
.tx-formula .fexpr{font-family:'DM Serif Display',serif;font-size:18px;color:var(--text)}

/* ── Practice questions ── */
.tx-practice{margin:46px 0 10px}
.tx-practice .ph{display:flex;align-items:baseline;justify-content:space-between;gap:12px;margin-bottom:18px;flex-wrap:wrap}
.tx-practice h2{font-size:clamp(24px,3.4vw,32px)}
.tx-practice .ph span{font-size:13px;color:var(--text3)}
.tx-q{border:1px solid var(--glass-border);border-radius:var(--r);background:var(--glass);overflow:hidden;margin-bottom:12px;transition:border-color .25s,background .25s}
.tx-q:hover{border-color:var(--border2)}
.tx-q[open]{background:var(--glass-strong)}
.tx-q summary{list-style:none;cursor:pointer;padding:18px 20px;display:flex;align-items:flex-start;gap:13px;font-size:15.5px;font-weight:500;color:var(--text)}
.tx-q summary::-webkit-details-marker{display:none}
.tx-q summary .lvl{font-size:9.5px;font-weight:700;text-transform:uppercase;letter-spacing:.04em;padding:3px 8px;border-radius:999px;flex-shrink:0;margin-top:1px;border:1px solid var(--glass-border)}
.tx-q .lvl.Foundational{color:#30d158;background:rgba(48,209,88,.14)}
.tx-q .lvl.Core{color:var(--accent);background:color-mix(in srgb,var(--accent) 12%,transparent)}
.tx-q .lvl.Advanced{color:#ff9f0a;background:rgba(255,159,10,.14)}
.tx-q summary .qtext{flex:1}
.tx-q summary .chev{width:18px;height:18px;color:var(--text3);flex-shrink:0;transition:transform .3s var(--ease-spring);margin-top:2px}
.tx-q[open] summary .chev{transform:rotate(180deg)}
.tx-q .ans{padding:0 20px 20px 51px;color:var(--text2);font-size:14.5px;line-height:1.65}
.tx-q .ans p{margin:0 0 10px}
.tx-q .ans p:last-child{margin-bottom:0}
.tx-q .ans strong{color:var(--text);font-weight:600}

/* ── Prev / next + back ── */
.tx-nav{display:flex;gap:14px;margin:46px auto 0;max-width:780px}
.tx-nav a{
  flex:1;text-decoration:none;color:inherit;
  background:var(--glass);border:1px solid var(--glass-border);border-radius:var(--r);
  padding:18px 20px;box-shadow:var(--float-sm);
  transition:transform .25s var(--ease-fluid),box-shadow .25s,border-color .25s,background .25s;
}
.tx-nav a:hover{transform:translateY(-3px);box-shadow:var(--float);border-color:var(--border2);background:var(--glass-strong)}
.tx-nav a.next{text-align:right}
.tx-nav .dir{font-size:11px;text-transform:uppercase;letter-spacing:.05em;color:var(--text3)}
.tx-nav .ttl{font-size:15px;font-weight:600;color:var(--text);margin-top:4px}
.tx-backlink{display:inline-flex;align-items:center;gap:8px;margin:38px 0 0;color:var(--text2);text-decoration:none;font-size:14px;font-weight:500}
.tx-backlink:hover{color:var(--text)}
.tx-backlink svg{width:16px;height:16px}

/* ── Responsive ── */
@media (max-width:760px){
  .tx-chapters{grid-template-columns:1fr}
  .tx-nav{flex-direction:column}
  .tx-page{padding-top:110px}
  .tx-q .ans{padding-left:20px}
}