/* ============================================================
   Matthew's Guide — Course design system
   One consistent visual language for every lesson.
   Load with the Fraunces + DM Sans webfonts (see lesson template).
   ============================================================ */

:root{
  --ink:#0f0e0c;        /* near-black, primary surfaces & text */
  --ink-2:#1c1a16;      /* raised dark */
  --paper:#f4efe6;      /* page background */
  --cream:#e9e2d4;      /* secondary surface */
  --gold:#c8962b;       /* primary accent */
  --gold-bright:#f0b537;/* accent on dark */
  --mid:#6f685c;        /* muted text */
  --rule:#d8cfbd;       /* borders */
  --ok:#1f7a4d; --ok-bg:#dff0e4;
  --bad:#bb2f2f; --bad-bg:#f7e1de;
  --display:'Fraunces',Georgia,serif;
  --sans:'DM Sans',system-ui,sans-serif;
  --wrap:920px;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{background:var(--paper);color:var(--ink);font-family:var(--sans);font-weight:400;line-height:1.6;-webkit-font-smoothing:antialiased}
em{font-style:italic}

/* --- Top bar --- */
.c-bar{background:var(--ink);padding:1rem 2rem;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:50}
.c-bar a{color:var(--paper);text-decoration:none;font-weight:600;letter-spacing:.14em;text-transform:uppercase;font-size:.72rem}
.c-bar a:hover{color:var(--gold-bright)}
.c-bar .c-bar-meta{color:var(--gold-bright);font-size:.66rem;letter-spacing:.18em;text-transform:uppercase}

/* --- Hero (bold, dark, oversized ghost numeral) --- */
.c-hero{background:var(--ink);color:var(--paper);padding:4.5rem 2rem 4rem;position:relative;overflow:hidden}
.c-hero-inner{max-width:var(--wrap);margin:0 auto;position:relative;z-index:2}
/* course-landing hero kept compact so the CTAs sit above the fold */
.c-hero-home{padding-top:3rem;padding-bottom:3rem}
.c-hero-home h1{font-size:clamp(2.4rem,5.4vw,4.4rem)}
.c-hero-home .c-sub{margin-top:1.1rem}
.c-hero .c-num{position:absolute;right:-1rem;top:-3.5rem;font-family:var(--display);font-weight:900;font-size:22rem;line-height:1;color:transparent;-webkit-text-stroke:2px rgba(200,150,43,.28);z-index:1;pointer-events:none;user-select:none}
.c-hero .c-kicker{font-size:.78rem;font-weight:700;letter-spacing:.28em;text-transform:uppercase;color:var(--gold-bright);margin-bottom:1rem}
.c-hero h1{font-family:var(--display);font-weight:900;font-size:clamp(3rem,10vw,6.5rem);line-height:.92;letter-spacing:-.01em;text-transform:uppercase}
.c-hero .c-sub{margin-top:1.4rem;font-size:1.15rem;max-width:36ch;color:#d9d2c4;line-height:1.55}
.c-hero-cta{display:flex;gap:1rem;margin-top:2.2rem;flex-wrap:wrap}
.c-hero-btn{font-family:var(--sans);font-weight:700;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;
  padding:1rem 2rem;border-radius:6px;text-decoration:none;display:inline-block;transition:background .15s,color .15s,border-color .15s}
.c-hero-btn.primary{background:var(--gold);color:var(--ink);border:2px solid var(--gold)}
.c-hero-btn.primary:hover{background:var(--gold-bright);border-color:var(--gold-bright)}
.c-hero-btn.ghost{background:none;color:var(--paper);border:2px solid rgba(247,244,239,.35)}
.c-hero-btn.ghost:hover{border-color:var(--paper)}
/* site-wide legal footer */
.c-legal{max-width:var(--wrap);margin:0 auto;padding:2.6rem 2rem 3rem;border-top:1px solid var(--rule);
  text-align:center;color:var(--mid);font-size:.8rem;line-height:1.6}
.c-legal a{color:var(--mid);text-decoration:underline}
.c-legal-tm{margin-top:.5rem;font-size:.72rem;opacity:.85;max-width:62ch;margin:.55rem auto 0}
/* light hero — used on Coming Soon placeholder pages only */
.c-hero-light{background:var(--paper);color:var(--ink);border-bottom:1px solid var(--rule)}
.c-hero-light .c-num{-webkit-text-stroke:2px rgba(200,150,43,.18)}
.c-hero-light .c-kicker{color:var(--gold)}
.c-hero-light .c-sub{color:var(--mid)}

/* --- Gold rule band: the explicit rule statement --- */
.c-rule{max-width:var(--wrap);margin:1.8rem auto 0;padding:0 2rem}
.c-rule-i{background:#fbf8f1;border:1px solid var(--rule);border-left:4px solid var(--gold);
  border-radius:8px;padding:1.1rem 1.4rem;display:block}
.c-rule .c-rule-tag{font-family:var(--sans);font-weight:700;font-size:.7rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gold);display:block;margin-bottom:.45rem}
.c-rule p{font-size:1.05rem;font-weight:400;line-height:1.62;color:var(--ink)}
.c-rule b{font-weight:700}

/* --- Lesson body container --- */
.c-wrap{max-width:var(--wrap);margin:0 auto;padding:3.5rem 2rem 6rem}
.c-section-tag{font-size:1.2rem;font-weight:700;letter-spacing:.15em;text-transform:uppercase;color:var(--gold);margin:0 0 1.2rem;display:flex;align-items:center;gap:.8rem}
.c-section-tag::before{content:"";width:2rem;height:2px;background:var(--gold)}

/* --- Teaching beats --- */
.c-h{font-family:var(--sans);font-weight:700;font-size:1.5rem;line-height:1.25;margin:2.2rem 0 1rem;letter-spacing:-.01em}
.c-p{font-size:1.12rem;line-height:1.85;margin-bottom:1.1rem;max-width:64ch}
/* Overview reads tighter — paragraphs sit close together */
.c-chunk-overview .c-p{line-height:1.65;margin-bottom:.5rem}
/* "In this lesson, you will learn to" — white recessed card */
.c-h.c-learn{background:#fff;border:1px solid var(--rule);border-bottom:none;border-radius:12px 12px 0 0;
  box-shadow:inset 0 2px 5px rgba(15,14,12,.04);padding:1.4rem 1.6rem .3rem;margin:1rem 0 0;font-size:1.3rem}
.c-h.c-learn + .c-bullets{background:#fff;border:1px solid var(--rule);border-top:none;border-radius:0 0 12px 12px;
  box-shadow:inset 0 -2px 5px rgba(15,14,12,.04);margin:0 0 1.6rem;padding:.5rem 1.7rem 1.4rem 2.9rem;max-width:none}
.c-steps{counter-reset:step;list-style:none;margin:.4rem 0 1.4rem;padding:0;max-width:64ch}
.c-steps li{position:relative;padding:.6rem 0 .6rem 2.7rem;border-bottom:1px solid var(--rule);
  line-height:1.6;font-size:1.04rem}
.c-steps li:last-child{border-bottom:none}
.c-bullets{margin:.3rem 0 1.3rem;padding-left:1.25rem;max-width:64ch}
.c-bullets li{font-size:1.08rem;line-height:1.75;margin-bottom:.45rem}
.c-steps li::before{counter-increment:step;content:counter(step);position:absolute;left:0;top:.55rem;
  width:1.7rem;height:1.7rem;border-radius:50%;background:var(--ink);color:var(--paper);
  font-family:var(--sans);font-weight:700;font-size:.82rem;display:flex;align-items:center;justify-content:center}
/* steps fade in one-by-one as the list scrolls into view */
.c-steps.reveal li{opacity:0;transform:translateY(10px)}
.c-steps.reveal li.in{opacity:1;transform:none;transition:opacity .85s ease,transform .85s ease}
@media(prefers-reduced-motion:reduce){.c-steps.reveal li{opacity:1;transform:none;transition:none}}
.c-eg{font-family:var(--sans);font-size:1.05rem;font-style:normal;line-height:1.75;background:#fff;
  border:1px solid var(--rule);border-radius:10px;box-shadow:inset 0 2px 5px rgba(15,14,12,.04);
  padding:1rem 1.3rem;margin:1.2rem 0}
.c-eg-ico{margin-right:.5rem}
.c-eg b{font-weight:700;color:var(--ink)}
/* keep correct/wrong example pairs colored — the red/green is the teaching cue */
.c-eg.bad{background:var(--bad-bg);border-color:#e3b1ab}
.c-eg.good{background:var(--ok-bg);border-color:#bcdcc6}
/* a lead-in introduces the question right below it — keep them tight */
.c-eg + .c-widget,.c-aside + .c-widget{margin-top:.35rem}
.c-eg:has(+ .c-widget),.c-aside:has(+ .c-widget){margin-bottom:.35rem}
.c-strike{text-decoration:line-through;text-decoration-thickness:1.5px;color:var(--mid)}
/* "^ label" captions above an example, the way the book labels its examples */
.c-eg-lab{display:block;font-style:italic;font-weight:600;font-size:.82rem;color:var(--gold);
  letter-spacing:.02em;margin:.3rem 0 .15rem}
.c-eg-lab.left{text-align:left}.c-eg-lab.center{text-align:center}.c-eg-lab.right{text-align:right}
.c-eg-lab.row{display:flex;justify-content:space-between;gap:1rem}
/* bolded punctuation in examples — enlarged so the comma/dash/parenthesis jumps out */
.c-emp-punct{font-size:1.3em;line-height:0;font-weight:800;color:var(--ink)}
.c-table-wrap{overflow-x:auto;margin:1.3rem 0}
.c-table{border-collapse:collapse;width:100%;font-family:var(--sans);font-size:1rem}
.c-table th,.c-table td{border:1px solid var(--rule);padding:.6rem .9rem;text-align:left}
.c-table th{background:#faf6ec;font-weight:700}
.c-table tbody tr:nth-child(even){background:#fdfbf6}
/* recessed white aside — lead-ins and reference lists (not green examples) */
.c-aside{background:#fff;border:1px solid var(--rule);border-radius:10px;padding:.9rem 1.2rem;margin:1.2rem 0;
  box-shadow:inset 0 2px 5px rgba(15,14,12,.04);font-size:1.04rem;line-height:1.7;color:var(--ink)}
.c-aside b{font-weight:700}
/* inline ✅/❌ markers for example lines absorbed into a 🔎 box */
.c-eg-mk{font-size:.95em}
/* cross-reference link to another lesson */
.c-xref{color:var(--gold);text-decoration:underline;text-underline-offset:2px;font-weight:500}
.c-xref:hover{color:var(--ink)}
.c-note{padding:1.15rem 1.45rem;margin:1.6rem 0;font-size:1.1rem;line-height:1.65;border-left:4px solid var(--gold);background:#fffdf6}
.c-note.warn{border-color:var(--bad);background:#fdf2f0}
.c-note .c-note-tag{display:block;font-size:.74rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--gold);margin-bottom:.4rem}
.c-note.rule{background:#fbf6ea;border-left-width:5px;font-weight:500}
.c-note.warn .c-note-tag{color:var(--bad)}
.c-note-list{margin:.55rem 0 0;padding-left:1.3rem}
.c-note-list li{margin:.4rem 0;line-height:1.6}

/* --- Bite-sized chunk flow --- */
.c-chunk{border-top:1px solid var(--rule);padding-top:1.4rem;scroll-margin-top:72px}
.c-chunk:first-child{border-top:none;padding-top:.4rem}
.c-chunk>:last-child{margin-bottom:.9rem}
.c-chunk-hidden,.is-hidden{display:none}
.c-continue-wrap{display:flex;justify-content:center;align-items:center;gap:.8rem;padding:1.4rem 0 .5rem}
.c-continue-wrap .c-btn-primary{font-size:.92rem;padding:1rem 2.6rem}
.c-inline-cta{display:flex;flex-wrap:wrap;align-items:center;gap:.7rem 1.1rem;margin:1.6rem 0 .4rem;
  padding:1.1rem 1.3rem;background:var(--cream);border:1px solid var(--rule);border-radius:10px}
.c-inline-cta-l{font-weight:700;font-size:1.04rem;flex-basis:100%}
.c-inline-cta-primary{background:var(--gold);color:var(--ink);font-weight:700;text-decoration:none;
  padding:.65rem 1.3rem;border-radius:6px;transition:background .15s,transform .1s}
.c-inline-cta-primary:hover{background:var(--gold-bright);transform:translateY(-1px)}
.c-inline-cta-book{color:var(--mid);font-weight:500;font-size:.92rem;text-decoration:underline;text-underline-offset:2px;display:inline-flex;align-items:center}
.c-inline-cta-book:hover{color:var(--ink)}
.c-amzn{width:1.7em;height:.65em;margin-left:.4em}

/* --- Sidebar parts foldout (under the current lesson) --- */
.c-tree-l.current.c-tree-l-toggle{cursor:pointer;justify-content:flex-start}
.c-tree-caret{margin-left:auto;color:var(--gold);font-size:.7rem;transition:transform .18s;flex-shrink:0}
.c-tree-l.current.is-collapsed .c-tree-caret{transform:rotate(-90deg)}
.c-tree-parts{background:#fbf1da;padding:.25rem 0 .5rem;border-bottom:1px solid var(--rule);overflow:hidden}
.c-tree-parts.collapsed{display:none}
.c-tree-part{display:flex;align-items:flex-start;gap:.55rem;padding:.4rem 1.4rem .4rem 2.5rem;
  font-size:.85rem;line-height:1.3;color:var(--mid);text-decoration:none;cursor:pointer}
.c-tree-part:hover{color:var(--ink)}
.c-tree-part-mark{flex-shrink:0;width:.55rem;height:.55rem;margin-top:.35rem;border-radius:50%;border:1.5px solid var(--rule)}
.c-tree-part.done{color:var(--ink)}
.c-tree-part.done .c-tree-part-mark{background:var(--ok);border-color:var(--ok)}
.c-tree-part.active{color:var(--ink);font-weight:600}
.c-tree-part.active .c-tree-part-mark{background:var(--gold);border-color:var(--gold)}

/* --- Embedded video (responsive 16:9) --- */
.c-video{margin:2.4rem 0}
.c-video .frame{position:relative;aspect-ratio:16/9;background:var(--ink);border-radius:12px;overflow:hidden}
.c-video iframe{position:absolute;inset:0;width:100%;height:100%;border:0}
.c-video .placeholder{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:.7rem;color:var(--gold-bright);text-align:center;padding:1rem}
.c-video .placeholder .play{width:58px;height:58px;border-radius:50%;border:2px solid var(--gold-bright);display:flex;align-items:center;justify-content:center;font-size:1.2rem}
.c-video .placeholder small{font-size:.72rem;letter-spacing:.16em;text-transform:uppercase;color:rgba(240,181,55,.7)}

/* --- Interactive widget shell --- */
.c-widget{margin:1.3rem 0 1.8rem}
/* exercise widgets (identify/fill-in/crossoff/classify) read as a distinct, interactive card */
.c-widget:has(.c-instruction){background:#fff;border:1px solid var(--rule);border-radius:14px;
  padding:1.5rem 1.6rem;box-shadow:0 1px 3px rgba(15,14,12,.04)}
.c-widget .c-instruction::before{content:"\270E  Your turn";display:block;font-size:.66rem;font-weight:800;
  letter-spacing:.16em;text-transform:uppercase;color:var(--gold);margin-bottom:.55rem}
.c-widget .c-instruction{font-family:var(--sans);font-size:1.3rem;font-weight:700;line-height:1.3;margin-bottom:.5rem;letter-spacing:-.01em}
.c-fill-exp{flex-basis:100%;display:none;margin:.45rem 0 .1rem 2.65rem;padding:.55rem .9rem;
  background:var(--bad-bg);border-left:3px solid var(--bad);border-radius:0 7px 7px 0;
  font-size:.95rem;line-height:1.55;color:var(--ink)}
.c-fill-exp.show{display:block}
.c-widget .c-hint{color:var(--mid);font-size:.98rem;margin-bottom:1.6rem;max-width:60ch}
/* fill-in-the-blank exercise */
.c-fill-list{margin:.6rem 0 0}
.c-fill-row{display:flex;flex-wrap:wrap;align-items:baseline;gap:.35rem .55rem;padding:.5rem 0;font-size:1.05rem;line-height:1.85}
.c-fill-row.c-fill-gap{margin-top:1.1rem;border-top:1px solid var(--rule);padding-top:1.2rem}
.c-fill-label{font-weight:700;color:var(--mid);min-width:2.3rem;flex-shrink:0}
.c-fill-text{flex:1;min-width:55%}
.c-fill-in{font:inherit;font-size:1rem;border:none;border-bottom:2px solid var(--gold);background:#fffdf6;
  padding:.05rem .45rem;min-width:7rem;width:9.5rem;outline:none;color:var(--ink);text-align:center}
.c-fill-in:focus{background:#fff7e6}
.c-fill-in.ok{border-color:var(--ok);background:var(--ok-bg);color:var(--ink)}
.c-fill-in.bad{border-color:var(--bad);background:var(--bad-bg)}
.c-fill-free{width:15rem;text-align:left}
.c-fill-sel{font:inherit;font-size:1rem;border:none;border-bottom:2px solid var(--gold);background:#fffdf6;
  padding:.1rem 1.5rem .1rem .5rem;outline:none;color:var(--ink);cursor:pointer;border-radius:5px 5px 0 0;
  -webkit-appearance:none;appearance:none;
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 10 6'%3E%3Cpath d='M1 1l4 4 4-4' fill='none' stroke='%23c8962b' stroke-width='1.6'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right .5rem center;background-size:.6rem}
.c-fill-sel:focus{background-color:#fff7e6}
.c-fill-sel.ok{border-color:var(--ok);background-color:var(--ok-bg);color:var(--ink)}
.c-fill-sel.bad{border-color:var(--bad);background-color:var(--bad-bg);color:var(--ink)}
.c-fill-show{font:inherit;font-size:.82rem;font-weight:600;color:var(--gold);background:none;border:none;
  cursor:pointer;text-decoration:underline;padding:0}
.c-fill-yn{display:inline-flex;gap:.4rem}
.c-yn{font:inherit;font-weight:600;font-size:.9rem;padding:.22rem .9rem;border:1.5px solid var(--rule);
  border-radius:999px;background:#fff;cursor:pointer;color:var(--ink);transition:background .12s,color .12s,border-color .12s}
.c-yn:hover{border-color:var(--ink)}
.c-yn.sel{border-color:var(--ink);background:var(--ink);color:var(--paper)}
.c-yn.ok{border-color:var(--ok);background:var(--ok);color:#fff}
.c-yn.bad{border-color:var(--bad);background:var(--bad);color:#fff}
.c-fill-mark{font-weight:700;flex-shrink:0;font-size:1.05rem}
.c-fill-mark.ok{color:var(--ok)}
.c-fill-mark.bad{color:var(--bad)}
.c-fill-correct{font-weight:600;color:var(--ink)}
.c-fill-answer{flex-basis:100%;color:var(--ok);font-weight:600;margin:.15rem 0 0 2.65rem;display:none}
.c-fill-answer.show{display:block}
.c-fill-foot{margin-top:1.5rem;display:flex;align-items:center;gap:1.1rem;flex-wrap:wrap}
.c-fill-score{font-weight:700;font-size:1.05rem;color:var(--mid)}
.c-fill-score.all-correct{color:var(--ok)}
/* [[word|label]] — a small label stacked above a word, the way the book annotates examples */
/* the word stays inline on the baseline; its small label floats centered above it */
.c-annot{position:relative;display:inline-block;white-space:nowrap}
.c-annot .c-annot-lab{position:absolute;left:50%;bottom:100%;transform:translateX(-50%);
  font-size:.56rem;font-weight:700;letter-spacing:.04em;text-transform:uppercase;
  color:var(--gold);white-space:nowrap;line-height:1;margin-bottom:2px;pointer-events:none}
.c-annot .c-annot-wd{font-weight:600;border-bottom:1.5px dotted var(--gold)}
/* give example boxes room above so the floating labels never clip the line above */
.c-eg:has(.c-annot),.c-aside:has(.c-annot){padding-top:1.7rem}
.c-eg:has(.c-annot) .c-eg-ico{top:1.7rem}

/* sentence + clickable tokens (cross-off widget) */
.c-sentence{font-family:var(--sans);font-size:clamp(1.15rem,2.6vw,1.55rem);line-height:1.95;margin:1rem 0 1.8rem;display:flex;flex-wrap:wrap;align-items:baseline}
.c-tok{background:none;border:none;font:inherit;color:var(--ink);cursor:pointer;padding:.05em .18em;margin:.05em .02em;border-radius:6px;transition:background .12s,color .12s,opacity .25s}
.c-tok:hover{background:var(--cream)}
.c-tok.punct{padding-left:.02em;padding-right:.06em;margin-left:-.18em}
.c-tok.struck{color:var(--bad);opacity:.45;text-decoration:line-through;text-decoration-thickness:3px;text-decoration-color:var(--bad)}
.c-tok.correct{color:var(--ok);font-weight:700;background:var(--ok-bg)}
.c-tok.wrong{color:var(--bad);background:var(--bad-bg)}
.c-id-prog{font-size:.78rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--mid);margin-bottom:.3rem}
.c-sentence.locked .c-tok{cursor:default}
.c-sentence.locked .c-tok:hover{background:none}

/* --- Buttons --- */
.c-controls{display:flex;gap:.8rem;flex-wrap:wrap;align-items:center}
.c-btn{font-family:var(--sans);font-weight:700;font-size:.82rem;letter-spacing:.1em;text-transform:uppercase;padding:1rem 1.8rem;border:none;border-radius:6px;cursor:pointer;transition:transform .1s,background .15s,color .15s;text-decoration:none;display:inline-block}
.c-btn:active{transform:translateY(1px)}
.c-btn-primary{background:var(--ink);color:var(--paper)}
.c-btn-primary:hover{background:var(--gold);color:var(--ink)}
.c-btn-ghost{background:none;color:var(--mid);border:2px solid var(--rule)}
.c-btn-ghost:hover{border-color:var(--ink);color:var(--ink)}
.c-btn-none{background:none;color:var(--bad);border:2px solid var(--bad)}
.c-btn-none:hover{background:var(--bad);color:#fff}

/* --- Result banner --- */
.c-result{margin-top:2rem;border-radius:10px;overflow:hidden;display:none}
.c-result.show{display:block}
.c-result-head{padding:1.1rem 1.5rem;font-weight:700;font-size:1.05rem;color:#fff}
.c-result.good .c-result-head{background:var(--ok)}
.c-result.bad .c-result-head{background:var(--bad)}
.c-result-body{background:#fff;border:2px solid var(--rule);border-top:none;padding:1.4rem 1.5rem;font-size:1rem;line-height:1.7}
.c-result.good .c-result-body{border-color:var(--ok)}
.c-result.bad .c-result-body{border-color:var(--bad)}
.c-core{font-family:var(--display);font-size:1.3rem;line-height:1.7;margin-top:.6rem}
.c-core .removed{color:var(--mid);opacity:.4;text-decoration:line-through;text-decoration-thickness:2px}

/* --- Practice handoff --- */
.c-practice{margin-top:3rem;background:var(--ink);color:var(--paper);border-radius:12px;padding:2.4rem 2rem;text-align:center}
.c-practice h3{font-family:var(--display);font-weight:600;font-size:1.7rem;margin-bottom:.5rem}
.c-practice p{color:#cfc8ba;font-size:1rem;margin-bottom:1.4rem}

/* --- Prev/next nav --- */
.c-nav{display:flex;justify-content:space-between;gap:1rem;margin-top:3rem;padding-top:1.5rem;border-top:1px solid var(--rule);font-size:.85rem}
.c-nav a{color:var(--gold);text-decoration:none;letter-spacing:.02em;font-weight:600}
.c-nav a:hover{text-decoration:underline}
.c-nav span{color:var(--rule)}

/* --- Gate / coming-soon --- */
.c-gate{max-width:540px;margin:3.5rem auto;text-align:center;background:#fff;border:1px solid var(--rule);border-radius:14px;padding:3rem 2rem}
.c-gate .lock{font-size:2rem;margin-bottom:.6rem}
.c-gate h2{font-family:var(--display);font-weight:900;font-size:2rem;text-transform:uppercase;margin-bottom:.6rem}
.c-gate p{color:var(--mid);font-size:1rem;margin-bottom:1.6rem;line-height:1.7}
.c-gate p.c-soon-sub{margin-bottom:.9rem;color:var(--ink);font-weight:600}
.c-soon-form{display:flex;gap:.5rem;max-width:420px;margin:0 auto .6rem}
.c-soon-form input[type="email"]{flex:1;min-width:0;padding:.7rem .9rem;font:inherit;font-size:.95rem;
  border:1px solid var(--rule);border-radius:9px;background:#fdfaf4;color:var(--ink);outline:none}
.c-soon-form input[type="email"]:focus{border-color:var(--gold)}
.c-soon-form button{white-space:nowrap}
.c-soon-note{font-size:.8rem;color:var(--mid);margin-bottom:1.8rem}
.c-soon-links{display:flex;flex-direction:column;gap:.55rem;align-items:center;
  border-top:1px solid var(--rule);padding-top:1.4rem}
.c-soon-link{color:var(--ink);font-weight:600;font-size:.95rem;text-decoration:none;
  display:inline-flex;align-items:center;gap:.2rem}
.c-soon-link:hover{color:var(--gold)}
@media(max-width:480px){.c-soon-form{flex-direction:column}}

@media(max-width:600px){
  .c-bar{padding:.8rem 1.2rem}
  .c-hero{padding:3rem 1.2rem}
  .c-hero .c-num{font-size:13rem;top:-1.5rem}
  .c-rule,.c-wrap{padding-left:1.2rem;padding-right:1.2rem}
}

/* ============================================================
   Khan-style course shell: left-rail tree + reading pane.
   ============================================================ */
.c-shell{display:grid;grid-template-columns:290px minmax(0,1fr)}
.c-main{min-width:0}

/* --- Left rail / course tree --- */
.c-side{position:sticky;top:0;align-self:start;height:100vh;overflow-y:auto;overflow-x:hidden;
  background:#fffdf9;border-right:1px solid var(--rule);padding:1.3rem 0 3rem}
.c-tree-inner{width:290px}
.c-tree-home{display:block;padding:.4rem 1.4rem 1.1rem;margin-bottom:.4rem;
  border-bottom:1px solid var(--rule);font-family:var(--display);font-weight:900;
  font-size:1.15rem;line-height:1.1;color:var(--ink);text-decoration:none}
.c-tree-home:hover,.c-tree-home.current{color:var(--gold)}
.c-tree-unit{padding:.9rem 0 .2rem}
.c-tree-unit + .c-tree-unit{border-top:1px solid var(--rule)}
.c-tree-unit-head{display:flex;align-items:baseline;justify-content:space-between;
  gap:.6rem;padding:.2rem 1.4rem .55rem}
.c-tree-unit-title{font-size:.7rem;font-weight:700;letter-spacing:.16em;
  text-transform:uppercase;color:var(--gold)}
.c-tree-unit-count{font-size:.66rem;font-weight:600;color:var(--mid);
  font-variant-numeric:tabular-nums}
.c-tree-l{display:flex;align-items:baseline;gap:.55rem;padding:.5rem 1.4rem .5rem 1.2rem;
  text-decoration:none;color:var(--ink);font-size:.92rem;line-height:1.3;
  border-left:3px solid transparent}
a.c-tree-l:hover{background:var(--cream)}
.c-tree-l.current{background:#fbf1da;border-left-color:var(--gold);font-weight:600}
.c-tree-l.soon{color:var(--mid);cursor:default}
.c-tree-mark{color:var(--gold);font-size:.85rem;width:1em;flex-shrink:0;text-align:center}
.c-tree-l.soon .c-tree-mark{color:var(--rule)}
.c-tree-num{color:var(--mid);font-size:.74rem;font-variant-numeric:tabular-nums;flex-shrink:0}
.c-tree-l.current .c-tree-num{color:var(--gold)}
.c-tree-title{flex:1}

/* --- Breadcrumb --- */
.c-crumb{max-width:var(--wrap);margin:0 auto;padding:1.4rem 2rem .2rem;
  font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--mid)}
.c-crumb a{color:var(--gold);text-decoration:none}
.c-crumb a:hover{text-decoration:underline}
.c-crumb .sep{margin:0 .5rem;color:var(--rule)}

/* --- "Up next" band --- */
.c-upnext{background:var(--ink-2);color:var(--paper);margin-top:3.5rem}
.c-upnext-i{max-width:var(--wrap);margin:0 auto;padding:1.8rem 2rem;
  display:flex;align-items:center;justify-content:space-between;gap:1rem}
.c-upnext .lbl{font-size:.7rem;font-weight:700;letter-spacing:.2em;
  text-transform:uppercase;color:var(--gold-bright);margin-bottom:.35rem}
.c-upnext .ttl{font-family:var(--display);font-weight:600;font-size:1.5rem;line-height:1.15}
.c-upnext a.go{flex-shrink:0;color:var(--paper);text-decoration:none;font-weight:700;
  font-size:.8rem;letter-spacing:.08em;text-transform:uppercase;
  border:2px solid var(--gold);border-radius:6px;padding:.85rem 1.4rem}
.c-upnext a.go:hover{background:var(--gold);color:var(--ink)}

/* --- Three-exit funnel footer (tutoring > book > next) --- */
.c-funnel{max-width:var(--wrap);margin:0 auto;padding:3.5rem 2rem 5rem}
.c-exit{display:block;text-decoration:none;color:inherit;border:1px solid var(--rule);
  border-radius:12px;padding:1.6rem 1.7rem;margin-bottom:1rem;transition:border-color .15s,transform .1s}
.c-exit:hover{border-color:var(--gold);transform:translateY(-2px)}
.c-exit .ek{font-size:.68rem;font-weight:700;letter-spacing:.18em;text-transform:uppercase;
  color:var(--gold);margin-bottom:.5rem}
.c-exit .eh{font-family:var(--display);font-weight:600;font-size:1.5rem;line-height:1.2;margin-bottom:.3rem}
.c-exit .ep{color:var(--mid);font-size:.96rem;line-height:1.55}
.c-exit.primary{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.c-exit.primary:hover{border-color:var(--gold-bright)}
.c-exit.primary .ek{color:var(--gold-bright)}
.c-exit.primary .ep{color:#cfc8ba}

/* --- Course home: unit sections --- */
.c-units{max-width:var(--wrap);margin:0 auto;padding:3rem 2rem 2rem}
.c-unit{margin-bottom:2.8rem}
.c-unit-h{display:flex;align-items:baseline;justify-content:space-between;gap:1rem;
  border-bottom:2px solid var(--ink);padding-bottom:.6rem;margin-bottom:.3rem}
.c-unit-h h2{font-family:var(--display);font-weight:900;font-size:1.7rem;line-height:1.1}
.c-unit-h .ct{font-size:.72rem;font-weight:600;letter-spacing:.1em;text-transform:uppercase;color:var(--mid)}
.c-unit-kick{color:var(--gold);font-size:.8rem;font-weight:600;letter-spacing:.08em;
  text-transform:uppercase;margin-bottom:1rem}
.c-ll{display:flex;align-items:center;gap:1rem;padding:1rem .4rem;text-decoration:none;
  color:inherit;border-bottom:1px solid var(--rule)}
a.c-ll:hover{background:var(--cream)}
.c-ll-num{font-family:var(--display);font-weight:900;font-size:1.5rem;color:var(--gold);
  min-width:2.2rem;flex-shrink:0;white-space:nowrap;font-variant-numeric:tabular-nums}
.c-ll-body{flex:1;min-width:0}
.c-ll-body h3{font-family:var(--display);font-weight:600;font-size:1.2rem;line-height:1.25}
.c-ll-body p{color:var(--mid);font-size:.9rem;line-height:1.5;margin-top:.15rem}
.c-ll-tag{flex-shrink:0;font-size:.64rem;font-weight:700;letter-spacing:.12em;
  text-transform:uppercase;padding:4px 10px;border-radius:20px;border:1px solid var(--rule);color:var(--mid)}
.c-ll-tag.free{color:var(--ok);border-color:#bcdcc6;background:var(--ok-bg)}
.c-ll-go{flex-shrink:0;color:var(--gold);font-size:1.3rem;font-weight:700}
.c-ll.soon{cursor:default}
.c-ll.soon .c-ll-num{color:var(--rule)}

/* --- Mobile: collapse the rail behind a toggle --- */
.c-side-toggle{display:inline-flex;align-items:center;gap:.45rem;background:#fff;border:1.5px solid var(--ink);
  border-radius:8px;font-family:var(--sans);font-weight:700;font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;
  color:var(--ink);padding:.6rem 1rem;margin:.9rem 0 -.2rem 1.4rem;cursor:pointer;transition:background .12s,color .12s}
.c-side-toggle:hover{background:var(--ink);color:var(--paper)}
@media(min-width:881px){
  .c-shell.side-collapsed{grid-template-columns:1fr}
  .c-shell.side-collapsed .c-side{display:none}
  /* collapse handle: a medium arrow sitting on the sidebar's edge */
  .c-side-toggle{position:fixed;top:50%;left:290px;transform:translate(-50%,-50%);z-index:60;
    width:26px;height:48px;padding:0;margin:0;border-radius:8px;border:1.5px solid var(--rule);
    background:#fff;color:var(--ink);display:flex;align-items:center;justify-content:center;
    font-size:1.05rem;letter-spacing:0;box-shadow:0 1px 5px rgba(15,14,12,.18)}
  /* when collapsed, pin the handle flush to the left edge so it's fully visible (not half off-screen) */
  .c-side-toggle.nav-collapsed{left:0;transform:translateY(-50%);width:38px;height:66px;
    border-left:none;border-radius:0 12px 12px 0;font-size:1.3rem}
}
@media(max-width:880px){
  .c-shell{grid-template-columns:1fr}
  /* floating pill that stays reachable while scrolling */
  .c-side-toggle{position:fixed;bottom:1.3rem;right:1.3rem;z-index:60;display:inline-flex;align-items:center;gap:.5rem;
    width:auto;text-align:center;background:var(--ink);color:var(--paper);border:none;border-radius:999px;
    font-family:var(--sans);font-weight:700;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;
    padding:.85rem 1.25rem;box-shadow:0 6px 22px rgba(15,14,12,.32);cursor:pointer}
  .c-tree-inner{width:100%}
  .c-side{position:static;height:auto;max-height:0;overflow:hidden;padding:0;border-right:none}
  /* open nav is a full-screen drawer; the floating button stays on top to close it */
  .c-side.open{position:fixed;top:0;left:0;right:0;bottom:0;max-height:none;overflow-y:auto;
    padding:4.5rem 0 5.5rem;background:var(--paper);z-index:55;box-shadow:0 12px 26px rgba(15,14,12,.18)}
}
@media(max-width:600px){
  .c-crumb,.c-upnext-i,.c-funnel,.c-units{padding-left:1.2rem;padding-right:1.2rem}
  .c-upnext-i{flex-direction:column;align-items:flex-start}
}

/* --- classify widget: tray of chips + group drop-zones --- */
.c-tray{display:flex;flex-wrap:wrap;gap:.55rem;min-height:3rem;padding:1rem;margin-bottom:1.4rem;
  background:var(--cream);border:1px dashed var(--rule);border-radius:10px;align-items:center}
.c-tray-empty{color:var(--mid);font-size:.92rem;font-style:italic}
.c-chip{font-family:var(--sans);font-weight:600;font-size:.95rem;color:var(--ink);background:#fff;
  border:1px solid var(--rule);border-radius:20px;padding:.5rem 1rem;cursor:pointer;
  transition:border-color .12s,background .12s,transform .08s}
.c-chip{cursor:grab}
.c-chip:hover{border-color:var(--gold)}
.c-chip:active{transform:translateY(1px)}
.c-chip.dragging{opacity:.45;cursor:grabbing}
.c-bucket.drag-over{border-color:var(--gold);background:#fbf1da}
.c-bucket.drag-over .c-bucket-drop{outline:2px dashed var(--gold);outline-offset:-6px}
.c-chip.sel{background:var(--gold);border-color:var(--gold);color:var(--ink);box-shadow:0 0 0 3px rgba(200,150,43,.25)}
.c-chip.wrong{border-color:var(--bad);background:var(--bad-bg);color:var(--bad)}
.c-chip.locked{cursor:default}
/* --- inline multiple-choice quiz --- */
.c-quiz{border:1px solid var(--rule);border-radius:14px;background:#fff;margin-top:.5rem;overflow:hidden}
.c-quiz-lead{padding:1.05rem 1.5rem;border-bottom:1px solid var(--rule);background:#faf7f1;font-size:1.05rem;line-height:1.6}
.c-quiz-lead .c-eg-ico{margin-right:.4rem}
.c-quiz-cols{display:flex;align-items:stretch}
.c-quiz-passage{flex:1 1 50%;min-width:0;padding:1.5rem;font-size:1rem;line-height:1.6}
/* rhetorical-synthesis "bullet point" notes (shown in the passage column) */
.c-notes-intro{font-size:.98rem;line-height:1.5;margin-bottom:.55rem}
.c-notes{margin:0;padding-left:1.2rem;font-size:.95rem}
.c-notes li{line-height:1.5;margin-bottom:.4rem}
.c-quiz-divider{flex:0 0 1px;background:var(--rule);margin:1.6rem 0;position:relative;cursor:col-resize}
.c-quiz-divider::before{content:"";position:absolute;top:0;bottom:0;left:-7px;right:-7px} /* wider drag target */
.c-quiz-divider::after{content:"";position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);
  width:13px;height:38px;border-radius:7px;background:#fff;border:1px solid var(--rule);box-shadow:0 1px 3px rgba(15,14,12,.16)}
@media(max-width:760px){.c-quiz-divider{cursor:default}.c-quiz-divider::before,.c-quiz-divider::after{display:none}}
.c-quiz-right{flex:1 1 50%;min-width:0;padding:1.5rem;display:flex;flex-direction:column}
/* Bluebook-style question bar (top): question number + mark-for-review + eliminator */
.c-quiz-qbar{display:flex;align-items:center;justify-content:space-between;gap:.7rem;flex-wrap:wrap;margin-bottom:1.1rem}
.c-quiz-prog{font-size:.8rem;font-weight:700;letter-spacing:.07em;text-transform:uppercase;color:var(--paper);background:var(--ink);padding:.35rem .85rem;border-radius:20px}
.c-quiz-elim{font-family:var(--sans);font-weight:700;font-size:.82rem;letter-spacing:.05em;color:var(--mid);
  background:#fff;border:1px solid var(--rule);border-radius:6px;padding:.4rem .8rem;cursor:pointer;
  transition:border-color .12s,color .12s,background .12s}
.c-quiz-elim span{text-decoration:line-through;text-decoration-thickness:2px}
.c-quiz-elim:hover{border-color:var(--ink);color:var(--ink)}
.c-quiz-elim.on{background:var(--ink);color:var(--paper);border-color:var(--ink)}

/* answer-choice row: the choice + (when eliminating) a cross-out toggle */
.c-choice-row{display:flex;align-items:center;gap:.6rem}
.c-choice-row .c-choice{flex:1;min-width:0}
.c-choice.struck{opacity:.5}
.c-choice.struck .c-choice-t{text-decoration:line-through;text-decoration-thickness:2px}
.c-choice-cross{flex-shrink:0;width:2rem;height:2rem;border-radius:50%;border:1.5px solid var(--mid);
  background:#fff;font-family:var(--sans);font-weight:700;font-size:.9rem;color:var(--mid);cursor:pointer;line-height:1}
.c-choice-cross:hover{border-color:var(--ink);color:var(--ink)}
.c-choice-cross.on{border-color:var(--bad);color:var(--bad)}

/* bottom navigation bar: Back · dots · Next/Finish */
.c-quiz-foot{display:flex;align-items:center;justify-content:space-between;gap:.9rem;flex-wrap:wrap;
  padding:.85rem 1.5rem;border-top:1px solid var(--rule);background:#faf7f1}
.c-quiz-nav{font-family:var(--sans);font-weight:700;font-size:.76rem;letter-spacing:.06em;text-transform:uppercase;
  color:var(--ink);background:#fff;border:1.5px solid var(--rule);border-radius:6px;padding:.55rem 1.1rem;cursor:pointer;transition:background .12s,color .12s,border-color .12s}
.c-quiz-nav:hover{background:var(--ink);color:var(--paper);border-color:var(--ink)}
.c-quiz-nav:disabled{opacity:.4;cursor:default}
.c-quiz-nav:disabled:hover{background:#fff;color:var(--ink);border-color:var(--rule)}
.c-quiz-dots{display:flex;gap:.45rem;align-items:center;flex-wrap:wrap;justify-content:center}
.c-quiz-dot{width:.7rem;height:.7rem;border-radius:50%;background:var(--rule);transition:transform .12s,background .12s}
.c-quiz-dot.done{background:var(--ok)}
.c-quiz-dot.active{background:var(--gold);transform:scale(1.35)}
.c-blank{display:inline-block;width:4.5em;border-bottom:1.5px solid var(--ink);margin:0 .12em}
@media(max-width:760px){.c-quiz-cols{flex-direction:column}.c-quiz-divider{flex-basis:1px;height:1px;width:auto;margin:0 1.8rem}.c-quiz-passage{padding-bottom:1rem}}
/* Bluebook-style question prompt + answer choices (mirrors practice/ engine) */
.c-quiz-prompt{font-family:var(--sans);font-weight:500;font-size:1.06rem;line-height:1.4;margin-bottom:1rem}
.c-quiz-choices{display:flex;flex-direction:column;gap:.7rem;margin-bottom:1.2rem}
.c-choice{display:flex;align-items:center;text-align:left;background:#fff;border:1px solid var(--ink);
  border-radius:.5rem;padding:.55rem .9rem;cursor:pointer;font:inherit;color:var(--ink);
  transition:transform .1s,box-shadow .12s}
.c-choice:hover{box-shadow:1px 1px 0 1px #dcdcdc;transform:scale(1.01)}
.c-choice:active{transform:scale(1);box-shadow:none}
.c-choice-l{flex-shrink:0;width:2rem;height:2rem;border-radius:50%;border:2px solid var(--ink);
  display:flex;align-items:center;justify-content:center;font-family:var(--sans);font-weight:500;
  font-size:1.05rem;margin-right:.85rem}
.c-choice-t{flex:1;line-height:1.4;font-size:.96rem}
/* rhetorical-synthesis quizzes (notes layout) carry more text — dial the type down a touch */
.c-quiz:has(.c-notes) .c-quiz-passage{font-size:.92rem}
.c-quiz:has(.c-notes) .c-notes-intro{font-size:.9rem}
.c-quiz:has(.c-notes) .c-notes{font-size:.88rem}
.c-quiz:has(.c-notes) .c-quiz-prompt{font-size:.98rem}
.c-quiz:has(.c-notes) .c-choice-t{font-size:.9rem}
.c-choice.sel{border-color:#2781d5;box-shadow:0 0 0 2px #2781d5}
.c-choice.sel .c-choice-l{background:#2781d5;color:#fff;border-color:#2781d5}
.c-choice.locked{cursor:default}
.c-choice.locked:hover{box-shadow:none;transform:none}
.c-choice.correct{border-color:var(--ok);box-shadow:0 0 0 2px var(--ok)}
.c-choice.correct .c-choice-l{border-color:var(--ok);background:var(--ok);color:#fff}
.c-choice.incorrect{border-color:var(--bad);box-shadow:0 0 0 2px var(--bad)}
.c-choice.incorrect .c-choice-l{border-color:var(--bad);background:var(--bad);color:#fff}
.c-quiz-exp{display:none}
.c-quiz-exp.show{display:block;border-top:1px solid var(--rule);padding:1.5rem 1.8rem;font-size:1rem;line-height:1.7}
.c-quiz-exp.nudge{display:block;border-top:1px solid var(--rule);color:var(--mid);font-size:.92rem;padding:1rem 1.8rem}
.c-quiz-exp.good{background:var(--ok-bg)}
.c-quiz-exp.bad{background:var(--bad-bg)}
.c-quiz-exp-h{font-weight:700;margin-bottom:.5rem}
.c-quiz-exp.good .c-quiz-exp-h{color:var(--ok)}.c-quiz-exp.bad .c-quiz-exp-h{color:var(--bad)}
/* the one explanation that matters most in a lesson: gold frame + badge */
.c-quiz-exp.key.show{border:2px solid var(--gold);border-radius:10px;background:#fffaef;box-shadow:0 2px 14px rgba(200,150,43,.16)}
.c-quiz-exp.key .c-quiz-exp-h{color:var(--ink);display:flex;flex-wrap:wrap;align-items:center;gap:.6rem}
.c-key-badge{font-size:.66rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;
  color:#7a5a12;background:var(--gold);background:linear-gradient(180deg,#e8b94a,#c8962b);
  color:#3a2b08;padding:.28rem .6rem;border-radius:999px;white-space:nowrap}
.c-quiz-exp-b{margin-bottom:.8rem}
.c-quiz-more{background:none;border:none;color:var(--gold);font-family:var(--sans);font-weight:700;
  font-size:.82rem;letter-spacing:.02em;cursor:pointer;padding:.3rem 0;margin-bottom:.5rem}
.c-quiz-more:hover{text-decoration:underline}
.c-quiz-full{display:none}
.c-quiz-full.show{display:block;margin:.2rem 0 1.1rem;padding:1.1rem 1.25rem;background:#fff;
  border:1px solid var(--rule);border-radius:8px;font-size:.95rem;line-height:1.65}
.c-quiz-full p{margin-bottom:.65rem}
.c-quiz-full p:last-child{margin-bottom:0}
.c-quiz-full .ok{color:var(--ok);font-weight:700}
.c-quiz-full .no{color:var(--bad);font-weight:700}
.c-quiz-done{margin:1.5rem;padding:2.2rem 1.5rem;text-align:center;background:#faf7f1;
  border:1px solid var(--rule);border-radius:12px;box-shadow:inset 0 2px 6px rgba(15,14,12,.05)}
.c-quiz-score{font-family:var(--display);font-weight:900;font-size:3rem;color:var(--gold);line-height:1}
.c-quiz-done p{color:var(--mid);margin:.6rem 0 1.4rem;font-size:1rem}

.c-buckets{display:grid;grid-template-columns:repeat(3,1fr);gap:1rem;margin-bottom:1.6rem}
.c-bucket{border:1px solid var(--rule);border-radius:12px;overflow:hidden;background:#fff;cursor:pointer;
  transition:border-color .12s}
.c-bucket:hover{border-color:var(--gold)}
.c-bucket-h{background:var(--ink);color:var(--paper);font-size:.72rem;font-weight:700;letter-spacing:.1em;
  text-transform:uppercase;padding:.7rem 1rem}
.c-bucket-drop{display:flex;flex-wrap:wrap;gap:.5rem;align-content:flex-start;min-height:6.5rem;padding:.9rem}
@media(max-width:680px){.c-buckets{grid-template-columns:1fr}.c-bucket-drop{min-height:3rem}}