/* Class 8 Mathematics — shared "textbook question help" design system.
 *
 * ONE stylesheet for every Ganita Prakash chapter's question-help pages (the
 * page-number grid, the textbook-question card, "Explain & Answer", the
 * exam-answer notebook, etc). Proportional Reasoning-1 is this product's
 * visual source of truth — every colour token and base rule below matches it
 * exactly, so no chapter drifts into its own theme.
 *
 * A chapter's own stylesheet loads AFTER this one and should contain ONLY
 * that chapter's own visual components (its SVG figure classes, its own
 * pedagogy-specific UI like Power Play's "guess" box, etc) — never a second
 * copy of the tokens or rules below. Two visual layers throughout: the
 * textbook question sits on "paper"; TextbookLive's explanation sits on the
 * app surface.
 */
:root{--dm-bg:#124F40;--dm-deep:#0A3B31;--dm-surface:#185E4C;--dm-border:#397565;--dm-text:#F7FAF8;--dm-soft:#C5D8D1;--dm-muted:#A7C2B8;--dm-mint:#A9E8CF;--dm-cream:#FFF6D8;--dm-hl:#FFD66B;--dm-paper:#FFFBEF;--dm-ink:#1E2A26;--dm-ink-soft:#4B5A55;--dm-rule:#D7E3EC;--dm-margin:#E8A0A0;--dm-card-hover:#1d6a56;--dm-answer-bg:#1F6B55;--dm-exam-h3:#1E7B63;--serif:'Noto Serif',Georgia,'Times New Roman',serif;--sans:Manrope,system-ui,-apple-system,'Segoe UI',sans-serif}
html{background:var(--dm-bg)}
body{margin:0;background:var(--dm-bg);color:var(--dm-text);font-family:var(--sans);font-size:18px;line-height:1.6;-webkit-text-size-adjust:100%}
.dm-root{min-height:100vh}
.dm-root *{box-sizing:border-box}
.dm-root a{color:var(--dm-mint);text-underline-offset:4px}
.dm-root i{font-family:var(--serif);font-style:italic}
.dm-root .nw{white-space:nowrap}
.dm-root sup,.dm-root sub{font-size:.7em;line-height:0}
.dm-top{position:sticky;top:0;z-index:5;display:flex;align-items:center;gap:12px;padding:8px 16px;background:var(--dm-deep);border-bottom:1px solid var(--dm-border)}
.dm-top-title{flex:1;min-width:0;margin:0;text-align:center;font-weight:650;font-size:15px;color:var(--dm-soft);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.dm-top-link{flex-shrink:0;display:inline-flex;align-items:center;min-height:44px;padding:0 6px;font-size:15px;font-weight:600;text-decoration:none}
.dm-main{max-width:860px;margin:0 auto;padding:22px 16px 60px;outline:none}
.dm-head h1{font-size:clamp(28px,5vw,40px);line-height:1.2;margin:6px 0 10px}
.dm-eyebrow{margin:0;color:var(--dm-mint);font-size:14px;font-weight:650;letter-spacing:.02em}
.dm-lead{color:var(--dm-soft);margin:0 0 24px}
.dm-note{color:var(--dm-muted);font-size:15px}
.dm-cards{list-style:none;padding:0;margin:14px 0 28px;display:grid;gap:12px}
.dm-card{display:grid;gap:4px;padding:16px 18px;border:1px solid var(--dm-border);border-radius:14px;background:var(--dm-surface);text-decoration:none;color:var(--dm-text)!important}
.dm-card:hover,.dm-card:focus-visible{border-color:var(--dm-mint);background:var(--dm-card-hover)}
.dm-card-where{font-size:14px;color:var(--dm-muted)}
.dm-card-q{font-family:var(--serif);font-size:17px}

/* Home page: optional richer variants some chapters use (page + kind badges, a collapsible map) */
.dm-home h2{font-size:22px;margin:8px 0 4px}
.dm-card-page{font-weight:700;color:var(--dm-cream)}
.dm-card-kind{font-size:13px;color:var(--dm-mint);font-weight:600}
.dm-map{border-top:1px solid var(--dm-border);padding-top:8px}
.dm-map summary{min-height:48px;display:flex;align-items:center;cursor:pointer;font-weight:650;color:var(--dm-cream)}
.dm-map h3{font-size:16px;margin:18px 0 6px;color:var(--dm-cream)}
.dm-map h3 span{font-weight:500;color:var(--dm-muted);font-size:14px;margin-left:6px}
.dm-map ul{margin:0;padding-left:20px;font-size:15px;color:var(--dm-soft)}
.dm-map li{margin:4px 0}
.dm-ready,.dm-later{font-size:12px;font-weight:700;padding:1px 7px;border-radius:99px;white-space:nowrap}
.dm-ready{background:var(--dm-mint);color:var(--dm-deep)}
.dm-later{border:1px solid var(--dm-border);color:var(--dm-muted)}

/* Question page */
.dm-crumb{display:flex;flex-wrap:wrap;gap:4px 14px;font-size:14px;color:var(--dm-muted);margin-bottom:12px}
.dm-crumb span:first-child{color:var(--dm-cream);font-weight:700}
.dm-crumb a{color:var(--dm-mint);font-weight:700;text-decoration:none}
.dm-textbook{background:var(--dm-paper);color:var(--dm-ink);border-radius:12px;padding:18px 22px 20px;box-shadow:0 2px 0 rgba(0,0,0,.18);border-left:6px solid #E1B93A}
.dm-tb-label{margin:0 0 10px;font-size:13px;font-weight:700;letter-spacing:.03em;text-transform:uppercase;color:#8A6A12;display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.dm-talk{text-transform:none;letter-spacing:0;font-weight:600;border:1.5px solid #3C5A8C;color:#3C5A8C;border-radius:99px;padding:0 9px;font-size:12px}
.dm-try-tag{text-transform:none;letter-spacing:0;font-weight:600;border:1.5px solid #B5551E;color:#B5551E;border-radius:99px;padding:0 9px;font-size:12px}
.dm-tb-body{font-family:var(--serif);font-size:20px;line-height:1.6}
.dm-tb-body p{margin:0 0 10px}
.dm-tb-list{margin:0 0 10px;padding-left:1.6em}
.dm-tb-sub{margin:10px 0 0;padding-left:.4em;list-style:none}
.dm-tb-sub li{margin:6px 0;display:grid;grid-template-columns:2.6em minmax(0,1fr)}
.dm-num{text-align:right;padding-right:.6em}
.dm-context{margin:12px 2px 0}
.dm-fig{display:block;width:100%;max-width:320px;height:auto;margin:14px auto}
.dm-fig-sm{max-width:300px}
.dm-fig-wide{max-width:460px}
.dm-explain .dm-fig{background:var(--dm-paper);border-radius:10px;padding:6px}
.dm-try{margin:18px 0 10px;color:var(--dm-soft)}
.dm-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px}
.dm-primary{font:inherit;font-size:20px;font-weight:700;min-height:60px;padding:12px 30px;border-radius:14px;border:0;background:var(--dm-hl);color:#2A2106;cursor:pointer;box-shadow:0 3px 0 #B8912C}
.dm-primary:hover{background:#FFE08A}
.dm-primary.is-open{background:transparent;color:var(--dm-cream);border:1.5px solid var(--dm-border);box-shadow:none;font-size:17px;min-height:48px;padding:8px 20px}
.dm-hint-btn{font:inherit;font-size:16px;font-weight:600;min-height:48px;padding:0 6px;background:none;border:0;color:var(--dm-mint);text-decoration:underline;text-underline-offset:4px;cursor:pointer}
.dm-root button:focus-visible,.dm-root a:focus-visible{outline:3px solid var(--dm-hl);outline-offset:3px}
.dm-hint{margin:14px 0 0;padding:12px 16px;border-left:4px solid var(--dm-mint);background:var(--dm-deep);border-radius:0 10px 10px 0}

/* Explanation */
.dm-explain{margin-top:26px;scroll-margin-top:70px}
.dm-part{padding:4px 0 10px;border-top:1px solid var(--dm-border)}
.dm-part:first-child{border-top:0}
.dm-part h3,.dm-answer h3,.dm-exam h3{font-size:15px;font-weight:750;letter-spacing:.05em;text-transform:uppercase;color:var(--dm-mint);margin:18px 0 8px}
.dm-part h4{font-size:19px;margin:22px 0 8px;color:var(--dm-cream);font-family:var(--serif);font-weight:600}
.dm-part p{margin:8px 0}
.dm-list{margin:8px 0;padding-left:22px}
.dm-list li{margin:6px 0}
.dm-rule-list{margin:8px 0;padding-left:26px}
.dm-rule-list li{margin:8px 0;padding-left:4px}
.dm-hl{background:rgba(255,214,107,.18);border-bottom:2px solid var(--dm-hl);padding:0 3px;border-radius:3px}
.dm-eq{font-family:var(--serif);font-size:21px;line-height:1.5;color:var(--dm-cream);margin:14px 0;padding:10px 16px;background:var(--dm-deep);border-radius:10px;overflow-wrap:break-word}
.dm-work{font-family:var(--serif);font-size:20px;color:var(--dm-cream);background:var(--dm-deep);border-radius:10px;padding:10px 16px;margin:12px 0;display:grid;grid-template-columns:max-content minmax(0,1fr);column-gap:10px;row-gap:6px}
.dm-work>div{display:contents}
.dm-work>div>span:first-child{text-align:right;color:var(--dm-soft)}
.dm-work>div>span:last-child{overflow-wrap:break-word}
.dm-grid4{grid-template-columns:max-content minmax(0,1fr)}
.dm-answer{margin:20px 0 6px;padding:6px 20px 12px;border-radius:14px;background:var(--dm-answer-bg);border:2px solid var(--dm-mint)}
.dm-answer p{margin:8px 0;font-size:19px}
.dm-answer .dm-note{font-size:15px;color:var(--dm-soft)}
.dm-answer-open{background:#5A4A1F;border-color:var(--dm-hl)}
.dm-scroll{overflow-x:auto;margin:10px 0}
.dm-table,.dm-steps{border-collapse:collapse;width:100%;font-size:17px}
.dm-table th,.dm-table td,.dm-steps th,.dm-steps td{border:1px solid var(--dm-border);padding:8px 10px;text-align:left;vertical-align:top}
.dm-table th,.dm-steps th{font-size:14px;color:var(--dm-muted);font-weight:650;background:var(--dm-deep)}
.dm-mono{font-variant-numeric:tabular-nums;white-space:nowrap}

/* Write in your exam / notebook: a notebook page */
.dm-exam{margin:30px 0 10px;background:#fff;color:var(--dm-ink);border-radius:12px;padding:6px 18px 18px 30px;position:relative;box-shadow:0 3px 0 rgba(0,0,0,.2);overflow:hidden}
.dm-exam::before{content:"";position:absolute;left:20px;top:0;bottom:0;border-left:2px solid var(--dm-margin)}
.dm-exam h3{color:var(--dm-exam-h3);margin:16px 0 6px}
.dm-exam-lines{font-family:var(--serif);font-size:19px;line-height:36px;background:repeating-linear-gradient(to bottom,transparent 0 35px,var(--dm-rule) 35px 36px)}
.dm-exam-lines p{margin:0;overflow-wrap:break-word}
.dm-exam-lines i{color:inherit}

.dm-pager{display:grid;grid-template-columns:1fr 1fr;gap:12px;margin-top:36px;border-top:1px solid var(--dm-border);padding-top:18px}
.dm-pager a{display:grid;gap:2px;padding:12px 14px;border:1px solid var(--dm-border);border-radius:12px;text-decoration:none;font-weight:700;min-height:48px}
.dm-pager a span{font-weight:400;font-size:14px;color:var(--dm-muted)}
.dm-pager .dm-next{text-align:right}

@media (max-width:600px){
  body{font-size:17px}
  .dm-main{padding:16px 16px 48px}
  .dm-top{padding:6px 10px;gap:6px}
  .dm-top-title{font-size:13px}
  .dm-top-link{font-size:14px}
  .dm-textbook{padding:14px 14px 16px;border-left-width:4px}
  .dm-tb-body{font-size:18px}
  .dm-primary{width:100%}
  .dm-eq{font-size:19px;padding:10px 12px}
  .dm-work{font-size:18px;padding:10px 12px;column-gap:6px;grid-template-columns:fit-content(38%) minmax(0,1fr)}
  .dm-table,.dm-steps{font-size:15px}
  .dm-table th,.dm-table td,.dm-steps th,.dm-steps td{padding:6px 7px}
  .dm-exam{padding:4px 12px 14px 24px}
  .dm-exam::before{left:14px}
  .dm-exam-lines{font-size:17px}
  .dm-pager{grid-template-columns:1fr}
  .dm-pager .dm-next{text-align:left}
}
@media (min-width:1100px){
  body{font-size:19px}
  .dm-main{max-width:920px}
  .dm-tb-body{font-size:22px}
}
@media (min-width:1600px){
  body{font-size:21px}
  .dm-main{max-width:1060px}
  .dm-tb-body{font-size:25px}
  .dm-eq,.dm-work{font-size:24px}
  .dm-exam-lines{font-size:22px;line-height:40px;background:repeating-linear-gradient(to bottom,transparent 0 39px,var(--dm-rule) 39px 40px)}
  .dm-primary{font-size:22px}
}
@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

/* ---- Shared chapter-wide additions (generated by every chapter's kit.js) ---- */
.dm-root .dm-m{font-family:var(--serif)}
.dm-root .fr{display:inline-flex;flex-direction:column;vertical-align:middle;text-align:center;font-size:.86em;line-height:1.15;margin:0 .12em}
.dm-root .fr>span:first-child{border-bottom:1.3px solid currentColor;padding:0 .15em}
.dm-root .fr>span:last-child{padding:0 .15em}
.dm-tb-context{color:var(--dm-ink-soft);font-size:.9em;border-left:3px solid #E6D9A8;padding-left:12px;margin:0 0 12px}
.dm-tb-context p{margin:0 0 6px}
.dm-tb-box{background:#FDE9C1;color:var(--dm-ink);border:1.5px solid #E1B93A;border-radius:8px;padding:10px 18px;margin:12px 0}
.dm-tb-box p{margin:6px 0}
.dm-tb-box i{color:inherit}
.dm-tb-num{display:grid;grid-template-columns:1.9em minmax(0,1fr);gap:0 .2em;margin:0 0 10px}
.dm-tb-num .dm-num{text-align:left;padding:0}
.dm-tb-cols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));column-gap:18px}
.dm-figure{margin:12px 0}
.dm-figure figcaption{text-align:center;font-size:14px;color:var(--dm-muted);margin-top:4px}
.dm-explain .dm-figure .dm-fig{margin:0 auto}
.dm-sub h4{margin-top:16px}
.dm-pages{display:grid;grid-template-columns:repeat(auto-fill,minmax(92px,1fr));gap:10px;margin:10px 0 28px}
.dm-pages a{display:grid;gap:2px;justify-items:center;padding:12px 6px;border:1px solid var(--dm-border);border-radius:12px;background:var(--dm-surface);text-decoration:none;color:var(--dm-text)!important;min-height:64px}
.dm-pages a:hover,.dm-pages a:focus-visible{border-color:var(--dm-mint);background:var(--dm-card-hover)}
.dm-pages strong{font-size:24px;color:var(--dm-cream)}
.dm-pages span{font-size:12px;color:var(--dm-muted)}
.dm-home-fio h2{font-size:18px;margin:0 0 6px}
.dm-fio-links{margin:0;padding-left:20px}
.dm-fio-links li{margin:8px 0}
.dm-page-head h1{margin-top:0}
.dm-page-section h2{font-size:15px;font-weight:700;letter-spacing:.03em;color:var(--dm-mint);margin:22px 0 8px}
.dm-page-section .dm-cards{margin:8px 0 12px}

@media (max-width:600px){
  .dm-tb-cols{grid-template-columns:minmax(0,1fr)}
  .dm-pages{grid-template-columns:repeat(4,minmax(0,1fr))}
  .dm-pages strong{font-size:20px}
}