/* ============================================================================
   guide.css — The Field Guide to Education Data (chapter design system)
   Loaded by /guide/ pages after app.css + extra.css. One shared system so
   every chapter reads as one book: term cards, viz frames with "why this
   chart wins" callouts, three audience lenses, emerging block, tool row.
   ========================================================================== */

/* ---- reference affordances: jump nav, updated stamp, term lookup ---------- */
.gd-jump{position:sticky;top:74px;z-index:40;display:flex;gap:4px;flex-wrap:wrap;background:rgba(248,243,233,.92);backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border:1px solid var(--line);border-radius:18px;padding:7px 9px;margin-top:20px;box-shadow:var(--sh-sm)}
.gd-jump .gj-lbl{font-size:.68rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--mute);align-self:center;padding:0 8px}
.gd-jump a{font-size:.8rem;font-weight:800;color:var(--ink-2);padding:6px 12px;border-radius:999px;transition:background var(--t-fast),color var(--t-fast)}
.gd-jump a:hover{background:var(--teal-tint);color:var(--teal-800)}
@media(max-width:700px){.gd-jump{position:static}.gd-jump .gj-lbl{display:none}}
.gd-updated{display:inline-flex;align-items:center;gap:6px;font-size:.78rem;font-weight:700;color:var(--mute)}
.gd-updated::before{content:"";width:7px;height:7px;border-radius:50%;background:var(--teal)}

/* term lookup (hub) */
.gd-lookup{max-width:640px;margin-top:22px;position:relative}
.gd-lookup input{width:100%;min-height:54px;padding:0 18px 0 48px;border:1.5px solid var(--line-2);border-radius:999px;font:400 1.05rem var(--font-body);background:#fff;color:var(--ink);box-shadow:var(--sh-sm)}
.gd-lookup input:focus-visible{border-color:var(--teal)}
.gd-lookup svg{position:absolute;left:16px;top:27px;transform:translateY(-50%);width:20px;height:20px;color:var(--mute);pointer-events:none}
.gd-hits{position:absolute;left:0;right:0;top:60px;z-index:60;background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);box-shadow:var(--sh-lg);overflow:hidden;display:none;max-height:330px;overflow-y:auto}
.gd-hits.show{display:block}
.gd-hits a{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:11px 16px;border-top:1px solid var(--line);color:var(--ink)}
.gd-hits a:first-child{border-top:0}
.gd-hits a:hover{background:var(--teal-tint)}
.gd-hits .h-term{font-weight:800}
.gd-hits .h-term .h-abbr{font-size:.72rem;font-weight:800;color:var(--teal-deep);background:var(--teal-tint);border-radius:6px;padding:2px 6px;margin-left:6px}
.gd-hits .h-topic{font-size:.78rem;font-weight:700;color:var(--mute);flex:none}
.gd-hits .h-none{padding:13px 16px;font-size:.9rem;color:var(--mute)}

/* ---- chapter hero ---------------------------------------------------------- */
.gd-hero{padding-top:4px}
.gd-hero .gd-ch{display:block;font-family:var(--font-display);font-weight:900;font-size:clamp(3rem,6.5vw,4.8rem);line-height:.9;letter-spacing:-.02em;color:transparent;-webkit-text-stroke:2px var(--gold);opacity:.55;user-select:none}
@supports not (-webkit-text-stroke:2px var(--gold)){.gd-hero .gd-ch{color:var(--gold-soft)}}
.gd-hero h1{margin:10px 0 0}
.gd-hero .lede{max-width:none;margin-top:14px}
.gd-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.gd-meta .chip.neutral::before{display:none}

/* ---- section rhythm -------------------------------------------------------- */
.gd-section{margin-top:clamp(36px,5vw,56px)}
/* first content section sits tight under the sticky jump nav (kills the
   double gap of section padding + section margin) */
.section .wrap>.gd-section:first-child{margin-top:0}
.gd-section>h2{font-size:clamp(1.5rem,2.8vw,2rem);margin-bottom:.35em}
.gd-section>.gd-sub{color:var(--ink-2);max-width:74ch;margin:0 0 22px}

/* ---- vocabulary accordion (replaces the card wall; cornerstone stays a card) */
.term-acc{display:flex;flex-direction:column;gap:10px;margin-top:14px}
.term-acc details{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:var(--r-sm);box-shadow:var(--sh-sm);overflow:hidden}
.term-acc details:nth-of-type(3n+2){border-left-color:var(--gold)}
.term-acc details:nth-of-type(3n){border-left-color:var(--teal-800)}
.term-acc summary{cursor:pointer;list-style:none;display:flex;align-items:center;gap:10px;padding:14px 18px;font-family:var(--font-display);font-weight:800;font-size:1.02rem;color:var(--ink);transition:background var(--t-fast)}
.term-acc summary:hover{background:var(--teal-tint)}
.term-acc summary::-webkit-details-marker{display:none}
.term-acc .tc-abbr{font-size:.74rem;font-weight:800;letter-spacing:.05em;color:var(--teal-deep);background:var(--teal-tint);border-radius:6px;padding:2px 7px;font-family:var(--font-body)}
.term-acc summary .mk{margin-left:auto;color:var(--gold-deep);font-weight:900;font-size:1.25rem;line-height:1;transition:transform var(--t-fast);flex:none}
.term-acc details[open] summary .mk{transform:rotate(45deg)}
.term-acc .ta-body{padding:2px 18px 16px}
.term-acc .ta-body p{margin:0;font-size:.95rem;color:var(--ink-2);line-height:1.6}
.term-acc .ta-body .tc-ex{margin-top:10px;padding-top:10px;border-top:1px dashed var(--line);font-size:.88rem;color:var(--ink-2);font-style:italic}
.term-acc .ta-body .tc-ex b{color:var(--ink);font-style:normal}

/* ---- vocabulary cards --------------------------------------------------------
   Differentiated so the grid scans instead of wallpapering: accents cycle,
   backgrounds alternate subtly, and 1-2 cornerstone terms per chapter
   (.tc-star) go full-width with bigger type so the eye catches them. */
.term-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}
@media(max-width:760px){.term-grid{grid-template-columns:1fr}}
.term-card{background:#fff;border:1px solid var(--line);border-left:4px solid var(--teal);border-radius:var(--r-sm);padding:16px 18px;box-shadow:var(--sh-sm)}
.term-card:nth-child(3n+2){border-left-color:var(--gold)}
.term-card:nth-child(3n+2) .tc-abbr{color:var(--gold-ink);background:var(--gold-soft)}
.term-card:nth-child(3n){border-left-color:var(--teal-800);background:var(--paper-2)}
.term-card .tc-word{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.term-card .tc-word b{font-family:var(--font-display);font-weight:800;font-size:1.05rem;color:var(--ink)}
.term-card .tc-word .tc-abbr{font-size:.74rem;font-weight:800;letter-spacing:.05em;color:var(--teal-deep);background:var(--teal-tint);border-radius:6px;padding:2px 7px}
.term-card p{margin:7px 0 0;font-size:.93rem;color:var(--ink-2);line-height:1.55}
.term-card .tc-ex{margin-top:9px;padding-top:9px;border-top:1px dashed var(--line);font-size:.86rem;color:var(--ink-2);font-style:italic}
.term-card .tc-ex b{color:var(--ink);font-style:normal}
/* cornerstone terms: full row, unmissable */
.term-card.tc-star{grid-column:1/-1;border-left:6px solid var(--teal-deep);background:linear-gradient(160deg,var(--teal-tint),#fff)}
.term-card.tc-star::before{content:"The one to know";display:inline-block;font-size:.64rem;font-weight:800;letter-spacing:.1em;text-transform:uppercase;color:var(--gold-ink);background:var(--gold-soft);border-radius:999px;padding:3px 10px;margin-bottom:8px}
.term-card.tc-star .tc-word b{font-size:1.3rem}
.term-card.tc-star p{font-size:1rem;max-width:78ch}

/* ---- the best chart for the job -------------------------------------------- */
.viz-frame{background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh);overflow:hidden;margin-top:18px}
.viz-frame .vf-head{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:13px 18px;border-bottom:1px solid var(--line);background:linear-gradient(180deg,var(--teal-tint),#fff)}
.viz-frame .vf-head .vt{font-family:var(--font-display);font-weight:800;font-size:.98rem;color:var(--ink)}
.viz-frame .vf-head .vk{font-size:.68rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--mute)}
.viz-frame .vf-body{padding:clamp(14px,2.5vw,24px)}
.viz-frame svg{display:block;width:100%;height:auto}
.viz-frame .vf-cap{padding:0 18px 14px;font-size:.82rem;color:var(--mute);font-style:italic}
.viz-why{display:flex;gap:12px;align-items:flex-start;background:var(--gold-soft);border:1px solid rgba(46,150,238,.4);border-radius:var(--r-sm);padding:14px 16px;margin-top:12px}
.viz-why .vw-ic{flex:none;width:34px;height:34px;border-radius:10px;background:var(--gold);color:#1D2B55;display:grid;place-items:center;font-weight:900;font-family:var(--font-display)}
.viz-why p{margin:0;font-size:.92rem;color:var(--ink);line-height:1.55}
.viz-why b{color:var(--gold-ink)}

/* ---- three lenses ----------------------------------------------------------- */
.lens-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:14px}
@media(max-width:860px){.lens-grid{grid-template-columns:1fr}}
.lens-card{background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:18px;box-shadow:var(--sh-sm);border-top:4px solid var(--teal-deep)}
.lens-card.l-school{border-top-color:var(--teal)}
.lens-card.l-family{border-top-color:var(--gold)}
.lens-card .lc-who{font-size:.7rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--mute)}
.lens-card h3{margin:6px 0 8px;font-size:1.05rem}
.lens-card p,.lens-card li{font-size:.92rem;color:var(--ink-2);line-height:1.55}
.lens-card ul{margin:8px 0 0;padding:0 0 0 18px}
.lens-card li{margin:5px 0}
.lens-card li::marker{color:var(--teal)}

/* ---- emerging block ---------------------------------------------------------- */
.gd-emerging{background:radial-gradient(700px 300px at 82% -30%,rgba(91,179,245,.16),transparent 60%),linear-gradient(160deg,var(--teal-deep),var(--teal-800));color:var(--on);border-radius:var(--r-lg);padding:clamp(22px,3.5vw,34px)}
.gd-emerging h2{color:#fff;margin-top:0}
.gd-emerging p,.gd-emerging li{color:var(--on-2);font-size:.96rem;line-height:1.6}
.gd-emerging ul{margin:10px 0 0;padding-left:20px}
.gd-emerging li{margin:7px 0}
.gd-emerging li::marker{color:var(--gold)}
.gd-emerging b{color:#fff}

/* ---- where the tools meet this ----------------------------------------------- */
.gd-toolrow{display:grid;grid-template-columns:repeat(3,1fr);gap:12px;margin-top:14px}
@media(max-width:760px){.gd-toolrow{grid-template-columns:1fr}}

/* ---- callout + sources -------------------------------------------------------- */
.gd-note{background:var(--teal-tint);border-left:4px solid var(--teal);border-radius:0 var(--r-sm) var(--r-sm) 0;padding:13px 16px;margin:16px 0;font-size:.94rem;color:var(--ink);line-height:1.55}
.gd-note b{color:var(--teal-800)}
.gd-sources{margin-top:clamp(30px,4vw,44px);padding-top:16px;border-top:1px solid var(--line)}
.gd-sources h3{font-size:.78rem;letter-spacing:.09em;text-transform:uppercase;color:var(--teal-deep);margin-bottom:8px}
.gd-sources p{font-size:.8rem;color:var(--mute);line-height:1.6;margin:0}
.gd-sources a{color:var(--teal-deep);text-decoration:underline;text-underline-offset:2px}

/* ---- prev/next chapter nav ----------------------------------------------------- */
.gd-pn{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:clamp(30px,4vw,44px)}
@media(max-width:620px){.gd-pn{grid-template-columns:1fr}}
.gd-pn a{display:flex;flex-direction:column;gap:3px;background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);padding:14px 18px;box-shadow:var(--sh-sm);color:var(--ink);transition:transform var(--t) var(--ease),box-shadow var(--t) var(--ease)}
.gd-pn a:hover{transform:translateY(-3px);box-shadow:var(--sh);color:var(--ink)}
.gd-pn .pn-dir{font-size:.68rem;font-weight:800;letter-spacing:.09em;text-transform:uppercase;color:var(--mute)}
.gd-pn .pn-title{font-family:var(--font-display);font-weight:800;color:var(--teal-deep)}
.gd-pn a.pn-next{text-align:right;align-items:flex-end}
.gd-pn a.pn-hub{grid-column:1/-1;text-align:center;align-items:center;background:var(--paper-2)}

/* ---- hub featured-topic rows (tools-page energy at half the height) --------
   Each row: mini signature-chart panel + body (title, why-it-matters hook,
   term chips, two actions). Alternating sides via .flip. */
.gf-stack{display:flex;flex-direction:column;gap:clamp(18px,2.5vw,26px);margin-top:30px}
.gf-row{display:grid;grid-template-columns:minmax(300px,380px) 1fr;gap:clamp(18px,3vw,34px);align-items:center;background:#fff;border:1px solid var(--line);border-radius:var(--r);box-shadow:var(--sh-sm);padding:clamp(16px,2.4vw,24px);transition:transform var(--t) var(--ease),box-shadow var(--t) var(--ease),border-color var(--t)}
.gf-row:hover{transform:translateY(-3px);box-shadow:var(--sh-lg);border-color:var(--gold-soft)}
.gf-row.flip{grid-template-columns:1fr minmax(300px,380px)}
.gf-row.flip .gf-viz{order:2}
@media(max-width:860px){.gf-row,.gf-row.flip{grid-template-columns:1fr}.gf-row.flip .gf-viz{order:0}}
.gf-viz{background:linear-gradient(160deg,var(--teal-tint),#fff);border:1px solid var(--line);border-radius:var(--r-sm);padding:14px 16px 12px}
.gf-viz .vz-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}
.gf-viz .vz-t{font-size:.68rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--mute)}
.gf-viz .vz-k{font-size:.64rem;font-weight:800;letter-spacing:.06em;text-transform:uppercase;color:var(--gold-ink);background:var(--gold-soft);border-radius:999px;padding:2px 8px}
.gf-viz svg{display:block;width:100%;height:auto}
.gf-viz .vz-cap{margin:7px 0 0;font-size:.72rem;color:var(--mute);font-style:italic}
.gf-body h3{margin:0 0 6px;font-size:clamp(1.15rem,2vw,1.4rem)}
.gf-why{margin:0;font-size:.95rem;color:var(--ink-2);line-height:1.55}
.gf-why b{color:var(--ink)}
.gf-terms{display:flex;flex-wrap:wrap;gap:6px;margin:12px 0 0}
.gf-terms span{font-size:.7rem;font-weight:800;color:var(--teal-800);background:var(--teal-tint);border:1px solid var(--teal-soft);border-radius:999px;padding:3px 9px}
.gf-ctas{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.gf-ctas .btn{min-height:42px;padding:10px 18px;font-size:.92rem}

/* ---- hub chapter cards ----------------------------------------------------------- */
.gch-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;margin-top:30px}
@media(max-width:760px){.gch-grid{grid-template-columns:1fr}}
.gch-card{display:flex;gap:16px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:var(--r);padding:22px;box-shadow:var(--sh-sm);color:var(--ink);transition:transform var(--t) var(--ease),box-shadow var(--t) var(--ease),border-color var(--t)}
.gch-card:hover{transform:translateY(-4px);box-shadow:var(--sh-lg);border-color:var(--teal-soft);color:var(--ink)}
.gch-card .gc-num{flex:none;font-family:var(--font-display);font-weight:900;font-size:2rem;line-height:1;color:transparent;-webkit-text-stroke:1.8px var(--gold);opacity:.6}
@supports not (-webkit-text-stroke:1.8px var(--gold)){.gch-card .gc-num{color:var(--gold-deep)}}
.gch-card h3{margin:0 0 5px;font-size:1.14rem}
.gch-card p{margin:0;font-size:.92rem;color:var(--ink-2);line-height:1.5}
.gch-card .gc-terms{display:flex;flex-wrap:wrap;gap:6px;margin-top:10px}
.gch-card .gc-terms span{font-size:.7rem;font-weight:800;color:var(--teal-800);background:var(--teal-tint);border:1px solid var(--teal-soft);border-radius:999px;padding:3px 9px}
.gch-card.coming{opacity:.65;pointer-events:none}
.gch-card.coming .gc-num{-webkit-text-stroke-color:var(--line-2)}

/* ---- vocabulary flashcards (topic pages) ----------------------------------
   Replaces the full-width accordion. A compact flip-card grid: front = term,
   back = full definition + the "in a sentence" example. Fixed footprint no
   matter how many terms a topic carries. Cards are real <button>s built from
   spans (buttons only allow phrasing content). vocab-cards.js runs the flips
   and the "Flip them all" toggle. Long backs scroll. */
.vc-bar{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin:16px 0 14px}
.vc-hint{display:inline-flex;align-items:center;gap:8px;font-size:.82rem;font-weight:800;color:var(--teal-deep)}
.vc-hint svg{width:15px;height:15px;flex:none}
.vc-flipall{font:inherit;font-weight:800;font-size:.84rem;color:var(--teal-800);background:#fff;border:1.5px solid var(--line-2);border-radius:999px;padding:8px 18px;cursor:pointer;transition:all var(--t-fast)}
.vc-flipall:hover{border-color:var(--teal);background:var(--teal-tint)}
.vc-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(232px,1fr));gap:12px}
.vc{perspective:1000px;position:relative;min-height:255px;font:inherit;text-align:center;background:none;border:0;padding:0;cursor:pointer;border-radius:var(--r-md)}
.vc:focus-visible{outline:3px solid var(--teal);outline-offset:3px}
.vc-in{position:absolute;inset:0;transform-style:preserve-3d;transition:transform .55s var(--ease)}
.vc.flip .vc-in{transform:rotateY(180deg)}
.vc-f,.vc-b{position:absolute;inset:0;backface-visibility:hidden;-webkit-backface-visibility:hidden;border-radius:var(--r-md);border:1px solid var(--line);box-shadow:var(--sh-sm);display:flex;flex-direction:column;padding:16px}
.vc-f{background:#fff;align-items:center;justify-content:center;gap:10px;transition:border-color var(--t-fast),box-shadow var(--t) var(--ease)}
.vc:hover .vc-f{border-color:var(--teal);box-shadow:var(--sh)}
.vc-f b{font-family:var(--font-display);font-weight:800;font-size:1.05rem;line-height:1.3;color:var(--ink)}
.vc-f .tc-abbr{font-size:.74rem;font-weight:800;letter-spacing:.05em;color:var(--teal-deep);background:var(--teal-tint);border-radius:6px;padding:2px 8px}
.vc-tap{display:inline-flex;align-items:center;gap:6px;font-size:.66rem;font-weight:800;letter-spacing:.09em;color:var(--mute)}
.vc-tap svg{width:13px;height:13px}
.vc-b{background:linear-gradient(170deg,var(--teal),var(--teal-700));border-color:var(--teal-700);transform:rotateY(180deg);text-align:left;gap:8px;overflow-y:auto;scrollbar-width:thin;scrollbar-color:rgba(255,255,255,.45) transparent}
.vc-b::-webkit-scrollbar{width:5px}
.vc-b::-webkit-scrollbar-thumb{background:rgba(255,255,255,.4);border-radius:99px}
.vc-def{display:block;font-size:.83rem;line-height:1.5;font-weight:600;color:#fff}
.vc-ex{display:block;margin-top:auto;padding-top:9px;border-top:1px dashed rgba(255,255,255,.35);font-size:.78rem;line-height:1.45;font-style:italic;color:var(--teal-on-dark,#BCC5E9)}
.vc-ex b{color:#fff;font-style:normal}
.vc.star .vc-f{background:linear-gradient(160deg,var(--gold-soft),#fff);border-color:var(--gold)}
.vc.star:hover .vc-f{border-color:var(--gold-deep)}
.vc-corner{font-size:.64rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase;color:var(--gold-ink);background:var(--gold-soft);border:1px solid var(--gold);border-radius:999px;padding:3px 10px}
.vc.star .vc-b{background:linear-gradient(170deg,var(--teal-700),var(--teal-800))}
@media(max-width:520px){.vc-grid{grid-template-columns:1fr 1fr;gap:9px}.vc{min-height:280px}.vc-f b{font-size:.94rem}.vc-def{font-size:.79rem}}
@media(prefers-reduced-motion:reduce){.vc-in{transition:none}}